Greg Kroah-Hartman | e3b3d0f | 2017-11-06 18:11:51 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Driver core for serial ports |
| 4 | * |
| 5 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 6 | * |
| 7 | * Copyright 1999 ARM Limited |
| 8 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/tty.h> |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 12 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/slab.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 14 | #include <linux/sched/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/init.h> |
| 16 | #include <linux/console.h> |
Johan Hovold | 167cbce | 2020-06-10 17:51:21 +0200 | [diff] [blame] | 17 | #include <linux/gpio/consumer.h> |
Grant Likely | a208ffd | 2014-03-27 18:29:46 -0700 | [diff] [blame] | 18 | #include <linux/of.h> |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 19 | #include <linux/proc_fs.h> |
| 20 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/device.h> |
| 22 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 23 | #include <linux/serial_core.h> |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 24 | #include <linux/sysrq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/delay.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 26 | #include <linux/mutex.h> |
David Howells | 794edf3 | 2019-08-19 17:17:54 -0700 | [diff] [blame] | 27 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Andy Shevchenko | aef3ad1 | 2017-08-13 17:47:42 +0300 | [diff] [blame] | 29 | #include <linux/irq.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 30 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | /* |
| 33 | * This is used to lock changes in serial line configuration. |
| 34 | */ |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 35 | static DEFINE_MUTEX(port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 37 | /* |
| 38 | * lockdep: port->lock is initialized in two places, but we |
| 39 | * want only one lock-class: |
| 40 | */ |
| 41 | static struct lock_class_key port_lock_key; |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
| 44 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 45 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 46 | struct ktermios *old_termios); |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 47 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 48 | static void uart_change_pm(struct uart_state *state, |
| 49 | enum uart_pm_state pm_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 51 | static void uart_port_shutdown(struct tty_port *port); |
| 52 | |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 53 | static int uart_dcd_enabled(struct uart_port *uport) |
| 54 | { |
Peter Hurley | d4260b5 | 2014-10-16 14:19:47 -0400 | [diff] [blame] | 55 | return !!(uport->status & UPSTAT_DCD_ENABLE); |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 56 | } |
| 57 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 58 | static inline struct uart_port *uart_port_ref(struct uart_state *state) |
| 59 | { |
| 60 | if (atomic_add_unless(&state->refcount, 1, 0)) |
| 61 | return state->uart_port; |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | static inline void uart_port_deref(struct uart_port *uport) |
| 66 | { |
Andy Shevchenko | ef510be | 2016-11-24 14:18:55 +0200 | [diff] [blame] | 67 | if (atomic_dec_and_test(&uport->state->refcount)) |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 68 | wake_up(&uport->state->remove_wait); |
| 69 | } |
| 70 | |
| 71 | #define uart_port_lock(state, flags) \ |
| 72 | ({ \ |
| 73 | struct uart_port *__uport = uart_port_ref(state); \ |
| 74 | if (__uport) \ |
| 75 | spin_lock_irqsave(&__uport->lock, flags); \ |
| 76 | __uport; \ |
| 77 | }) |
| 78 | |
| 79 | #define uart_port_unlock(uport, flags) \ |
| 80 | ({ \ |
| 81 | struct uart_port *__uport = uport; \ |
Andy Shevchenko | ef510be | 2016-11-24 14:18:55 +0200 | [diff] [blame] | 82 | if (__uport) { \ |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 83 | spin_unlock_irqrestore(&__uport->lock, flags); \ |
Andy Shevchenko | ef510be | 2016-11-24 14:18:55 +0200 | [diff] [blame] | 84 | uart_port_deref(__uport); \ |
| 85 | } \ |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 86 | }) |
| 87 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 88 | static inline struct uart_port *uart_port_check(struct uart_state *state) |
| 89 | { |
Peter Hurley | 7da4b8b | 2016-05-03 14:01:51 -0700 | [diff] [blame] | 90 | lockdep_assert_held(&state->port.mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 91 | return state->uart_port; |
| 92 | } |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | /* |
| 95 | * This routine is used by the interrupt handler to schedule processing in |
| 96 | * the software interrupt portion of the driver. |
| 97 | */ |
| 98 | void uart_write_wakeup(struct uart_port *port) |
| 99 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 100 | struct uart_state *state = port->state; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 101 | /* |
| 102 | * This means you called this function _after_ the port was |
| 103 | * closed. No cookie for you. |
| 104 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 105 | BUG_ON(!state); |
Rob Herring | d0f4bce | 2016-10-28 07:07:48 -0500 | [diff] [blame] | 106 | tty_port_tty_wakeup(&state->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static void uart_stop(struct tty_struct *tty) |
| 110 | { |
| 111 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 112 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | unsigned long flags; |
| 114 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 115 | port = uart_port_lock(state, flags); |
| 116 | if (port) |
| 117 | port->ops->stop_tx(port); |
| 118 | uart_port_unlock(port, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static void __uart_start(struct tty_struct *tty) |
| 122 | { |
| 123 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 124 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 126 | if (port && !uart_tx_stopped(port)) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 127 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static void uart_start(struct tty_struct *tty) |
| 131 | { |
| 132 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 133 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | unsigned long flags; |
| 135 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 136 | port = uart_port_lock(state, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | __uart_start(tty); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 138 | uart_port_unlock(port, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Denys Vlasenko | f4581ca | 2015-10-27 17:40:01 +0100 | [diff] [blame] | 141 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
| 143 | { |
| 144 | unsigned long flags; |
| 145 | unsigned int old; |
| 146 | |
| 147 | spin_lock_irqsave(&port->lock, flags); |
| 148 | old = port->mctrl; |
| 149 | port->mctrl = (old & ~clear) | set; |
| 150 | if (old != port->mctrl) |
| 151 | port->ops->set_mctrl(port, port->mctrl); |
| 152 | spin_unlock_irqrestore(&port->lock, flags); |
| 153 | } |
| 154 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 155 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
| 156 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Rafael Gago | a6845e1 | 2017-07-31 10:46:42 +0200 | [diff] [blame] | 158 | static void uart_port_dtr_rts(struct uart_port *uport, int raise) |
| 159 | { |
| 160 | int rs485_on = uport->rs485_config && |
| 161 | (uport->rs485.flags & SER_RS485_ENABLED); |
| 162 | int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); |
| 163 | |
| 164 | if (raise) { |
| 165 | if (rs485_on && !RTS_after_send) { |
| 166 | uart_set_mctrl(uport, TIOCM_DTR); |
| 167 | uart_clear_mctrl(uport, TIOCM_RTS); |
| 168 | } else { |
| 169 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
| 170 | } |
| 171 | } else { |
| 172 | unsigned int clear = TIOCM_DTR; |
| 173 | |
| 174 | clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; |
| 175 | uart_clear_mctrl(uport, clear); |
| 176 | } |
| 177 | } |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | /* |
| 180 | * Startup the port. This will be called once per open. All calls |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 181 | * will be serialised by the per-port mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | */ |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 183 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
| 184 | int init_hw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 186 | struct uart_port *uport = uart_port_check(state); |
Johan Hovold | 18ee37e | 2021-05-19 11:25:41 +0200 | [diff] [blame] | 187 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | unsigned long page; |
| 189 | int retval = 0; |
| 190 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 191 | if (uport->type == PORT_UNKNOWN) |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 192 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | /* |
Thomas Pfaff | 7deb39e | 2014-04-23 12:33:22 +0200 | [diff] [blame] | 195 | * Make sure the device is in D0 state. |
| 196 | */ |
| 197 | uart_change_pm(state, UART_PM_STATE_ON); |
| 198 | |
| 199 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | * Initialise and allocate the transmit and temporary |
| 201 | * buffer. |
| 202 | */ |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 203 | page = get_zeroed_page(GFP_KERNEL); |
| 204 | if (!page) |
| 205 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 207 | uart_port_lock(state, flags); |
| 208 | if (!state->xmit.buf) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 209 | state->xmit.buf = (unsigned char *) page; |
| 210 | uart_circ_clear(&state->xmit); |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 211 | uart_port_unlock(uport, flags); |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 212 | } else { |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 213 | uart_port_unlock(uport, flags); |
| 214 | /* |
| 215 | * Do not free() the page under the port lock, see |
| 216 | * uart_shutdown(). |
| 217 | */ |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 218 | free_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
| 220 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 221 | retval = uport->ops->startup(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (retval == 0) { |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 223 | if (uart_console(uport) && uport->cons->cflag) { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 224 | tty->termios.c_cflag = uport->cons->cflag; |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 225 | tty->termios.c_ispeed = uport->cons->ispeed; |
| 226 | tty->termios.c_ospeed = uport->cons->ospeed; |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 227 | uport->cons->cflag = 0; |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 228 | uport->cons->ispeed = 0; |
| 229 | uport->cons->ospeed = 0; |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 230 | } |
| 231 | /* |
| 232 | * Initialise the hardware port settings. |
| 233 | */ |
| 234 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 236 | /* |
| 237 | * Setup the RTS and DTR signals once the |
| 238 | * port is open and ready to respond. |
| 239 | */ |
| 240 | if (init_hw && C_BAUD(tty)) |
Rafael Gago | a6845e1 | 2017-07-31 10:46:42 +0200 | [diff] [blame] | 241 | uart_port_dtr_rts(uport, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Jiri Slaby | 0055197 | 2011-08-17 13:48:15 +0200 | [diff] [blame] | 244 | /* |
| 245 | * This is to allow setserial on this port. People may want to set |
| 246 | * port/irq/type and then reconfigure the port properly if it failed |
| 247 | * now. |
| 248 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | if (retval && capable(CAP_SYS_ADMIN)) |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 250 | return 1; |
| 251 | |
| 252 | return retval; |
| 253 | } |
| 254 | |
| 255 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, |
| 256 | int init_hw) |
| 257 | { |
| 258 | struct tty_port *port = &state->port; |
| 259 | int retval; |
| 260 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 261 | if (tty_port_initialized(port)) |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 262 | return 0; |
| 263 | |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 264 | retval = uart_port_startup(tty, state, init_hw); |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 265 | if (retval) |
| 266 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | return retval; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 273 | * DTR is dropped if the hangup on close termio flag is on. Calls to |
| 274 | * uart_shutdown are serialised by the per-port semaphore. |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 275 | * |
| 276 | * uport == NULL if uart_port has already been removed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 278 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 280 | struct uart_port *uport = uart_port_check(state); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 281 | struct tty_port *port = &state->port; |
Johan Hovold | 18ee37e | 2021-05-19 11:25:41 +0200 | [diff] [blame] | 282 | unsigned long flags; |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 283 | char *xmit_buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 285 | /* |
| 286 | * Set the TTY IO error marker |
| 287 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 288 | if (tty) |
| 289 | set_bit(TTY_IO_ERROR, &tty->flags); |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 290 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 291 | if (tty_port_initialized(port)) { |
| 292 | tty_port_set_initialized(port, 0); |
| 293 | |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 294 | /* |
| 295 | * Turn off DTR and RTS early. |
| 296 | */ |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 297 | if (uport && uart_console(uport) && tty) { |
Peter Hurley | ae84db9 | 2014-07-09 09:21:14 -0400 | [diff] [blame] | 298 | uport->cons->cflag = tty->termios.c_cflag; |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 299 | uport->cons->ispeed = tty->termios.c_ispeed; |
| 300 | uport->cons->ospeed = tty->termios.c_ospeed; |
| 301 | } |
Peter Hurley | ae84db9 | 2014-07-09 09:21:14 -0400 | [diff] [blame] | 302 | |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 303 | if (!tty || C_HUPCL(tty)) |
Rafael Gago | a6845e1 | 2017-07-31 10:46:42 +0200 | [diff] [blame] | 304 | uart_port_dtr_rts(uport, 0); |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 305 | |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 306 | uart_port_shutdown(port); |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | /* |
Doug Anderson | d208a3b | 2011-10-19 11:52:01 -0700 | [diff] [blame] | 310 | * It's possible for shutdown to be called after suspend if we get |
| 311 | * a DCD drop (hangup) at just the right time. Clear suspended bit so |
| 312 | * we don't try to resume a port that has been shutdown. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | */ |
Peter Hurley | 80f02d5 | 2016-04-09 17:53:24 -0700 | [diff] [blame] | 314 | tty_port_set_suspended(port, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | /* |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 317 | * Do not free() the transmit buffer page under the port lock since |
| 318 | * this can create various circular locking scenarios. For instance, |
| 319 | * console driver may need to allocate/free a debug object, which |
| 320 | * can endup in printk() recursion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | */ |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 322 | uart_port_lock(state, flags); |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 323 | xmit_buf = state->xmit.buf; |
| 324 | state->xmit.buf = NULL; |
Tycho Andersen | a5ba1d9 | 2018-07-06 10:24:57 -0600 | [diff] [blame] | 325 | uart_port_unlock(uport, flags); |
Sergey Senozhatsky | d724021 | 2018-12-13 13:58:39 +0900 | [diff] [blame] | 326 | |
| 327 | if (xmit_buf) |
| 328 | free_page((unsigned long)xmit_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | /** |
| 332 | * uart_update_timeout - update per-port FIFO timeout. |
| 333 | * @port: uart_port structure describing the port |
| 334 | * @cflag: termios cflag value |
| 335 | * @baud: speed of the port |
| 336 | * |
| 337 | * Set the port FIFO timeout value. The @cflag value should |
| 338 | * reflect the actual hardware settings. |
| 339 | */ |
| 340 | void |
| 341 | uart_update_timeout(struct uart_port *port, unsigned int cflag, |
| 342 | unsigned int baud) |
| 343 | { |
Jiri Slaby | 654ee49 | 2021-06-10 11:02:44 +0200 | [diff] [blame] | 344 | unsigned int size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Jiri Slaby | 654ee49 | 2021-06-10 11:02:44 +0200 | [diff] [blame] | 346 | size = tty_get_frame_size(cflag) * port->fifosize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | /* |
| 349 | * Figure the timeout to send the above number of bits. |
| 350 | * Add .02 seconds of slop |
| 351 | */ |
Jiri Slaby | 654ee49 | 2021-06-10 11:02:44 +0200 | [diff] [blame] | 352 | port->timeout = (HZ * size) / baud + HZ/50; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | EXPORT_SYMBOL(uart_update_timeout); |
| 356 | |
| 357 | /** |
| 358 | * uart_get_baud_rate - return baud rate for a particular port |
| 359 | * @port: uart_port structure describing the port in question. |
| 360 | * @termios: desired termios settings. |
| 361 | * @old: old termios (or NULL) |
| 362 | * @min: minimum acceptable baud rate |
| 363 | * @max: maximum acceptable baud rate |
| 364 | * |
| 365 | * Decode the termios structure into a numeric baud rate, |
| 366 | * taking account of the magic 38400 baud rate (with spd_* |
| 367 | * flags), and mapping the %B0 rate to 9600 baud. |
| 368 | * |
| 369 | * If the new baud rate is invalid, try the old termios setting. |
| 370 | * If it's still invalid, we try 9600 baud. |
| 371 | * |
| 372 | * Update the @termios structure to reflect the baud rate |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 373 | * we're actually going to be using. Don't do this for the case |
| 374 | * where B0 is requested ("hang up"). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | */ |
| 376 | unsigned int |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 377 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
| 378 | struct ktermios *old, unsigned int min, unsigned int max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 380 | unsigned int try; |
| 381 | unsigned int baud; |
| 382 | unsigned int altbaud; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 383 | int hung_up = 0; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 384 | upf_t flags = port->flags & UPF_SPD_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 386 | switch (flags) { |
| 387 | case UPF_SPD_HI: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | altbaud = 57600; |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 389 | break; |
| 390 | case UPF_SPD_VHI: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | altbaud = 115200; |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 392 | break; |
| 393 | case UPF_SPD_SHI: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | altbaud = 230400; |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 395 | break; |
| 396 | case UPF_SPD_WARP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | altbaud = 460800; |
Joakim Nordell | f10a223 | 2015-06-08 14:56:51 +0200 | [diff] [blame] | 398 | break; |
| 399 | default: |
| 400 | altbaud = 38400; |
| 401 | break; |
| 402 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | for (try = 0; try < 2; try++) { |
| 405 | baud = tty_termios_baud_rate(termios); |
| 406 | |
| 407 | /* |
| 408 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... |
| 409 | * Die! Die! Die! |
| 410 | */ |
Peter Hurley | 547039e | 2014-10-16 13:46:38 -0400 | [diff] [blame] | 411 | if (try == 0 && baud == 38400) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | baud = altbaud; |
| 413 | |
| 414 | /* |
| 415 | * Special case: B0 rate. |
| 416 | */ |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 417 | if (baud == 0) { |
| 418 | hung_up = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | baud = 9600; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 420 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | if (baud >= min && baud <= max) |
| 423 | return baud; |
| 424 | |
| 425 | /* |
| 426 | * Oops, the quotient was zero. Try again with |
| 427 | * the old baud rate if possible. |
| 428 | */ |
| 429 | termios->c_cflag &= ~CBAUD; |
| 430 | if (old) { |
Alan Cox | 6d4d67b | 2008-02-04 22:27:53 -0800 | [diff] [blame] | 431 | baud = tty_termios_baud_rate(old); |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 432 | if (!hung_up) |
| 433 | tty_termios_encode_baud_rate(termios, |
| 434 | baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | old = NULL; |
| 436 | continue; |
| 437 | } |
| 438 | |
| 439 | /* |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 440 | * As a last resort, if the range cannot be met then clip to |
| 441 | * the nearest chip supported rate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | */ |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 443 | if (!hung_up) { |
| 444 | if (baud <= min) |
| 445 | tty_termios_encode_baud_rate(termios, |
| 446 | min + 1, min + 1); |
| 447 | else |
| 448 | tty_termios_encode_baud_rate(termios, |
| 449 | max - 1, max - 1); |
| 450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 452 | /* Should never happen */ |
| 453 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | EXPORT_SYMBOL(uart_get_baud_rate); |
| 458 | |
| 459 | /** |
| 460 | * uart_get_divisor - return uart clock divisor |
| 461 | * @port: uart_port structure describing the port. |
| 462 | * @baud: desired baud rate |
| 463 | * |
| 464 | * Calculate the uart clock divisor for the port. |
| 465 | */ |
| 466 | unsigned int |
| 467 | uart_get_divisor(struct uart_port *port, unsigned int baud) |
| 468 | { |
| 469 | unsigned int quot; |
| 470 | |
| 471 | /* |
| 472 | * Old custom speed handling. |
| 473 | */ |
| 474 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
| 475 | quot = port->custom_divisor; |
| 476 | else |
Uwe Kleine-König | 97d2463 | 2011-12-20 11:47:44 +0100 | [diff] [blame] | 477 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | return quot; |
| 480 | } |
| 481 | |
| 482 | EXPORT_SYMBOL(uart_get_divisor); |
| 483 | |
Peter Hurley | 7c8ab96 | 2014-10-16 16:54:20 -0400 | [diff] [blame] | 484 | /* Caller holds port mutex */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 485 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
| 486 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 488 | struct uart_port *uport = uart_port_check(state); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 489 | struct ktermios *termios; |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 490 | int hw_stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | /* |
| 493 | * If we have no tty, termios, or the port does not exist, |
| 494 | * then we can't set the parameters for this port. |
| 495 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 496 | if (!tty || uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | return; |
| 498 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 499 | termios = &tty->termios; |
Peter Hurley | c18b55f | 2014-06-16 09:17:09 -0400 | [diff] [blame] | 500 | uport->ops->set_termios(uport, termios, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | /* |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 503 | * Set modem status enables based on termios cflag |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | */ |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 505 | spin_lock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (termios->c_cflag & CRTSCTS) |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 507 | uport->status |= UPSTAT_CTS_ENABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | else |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 509 | uport->status &= ~UPSTAT_CTS_ENABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | if (termios->c_cflag & CLOCAL) |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 512 | uport->status &= ~UPSTAT_DCD_ENABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | else |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 514 | uport->status |= UPSTAT_DCD_ENABLE; |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 515 | |
| 516 | /* reset sw-assisted CTS flow control based on (possibly) new mode */ |
| 517 | hw_stopped = uport->hw_stopped; |
| 518 | uport->hw_stopped = uart_softcts_mode(uport) && |
| 519 | !(uport->ops->get_mctrl(uport) & TIOCM_CTS); |
| 520 | if (uport->hw_stopped) { |
| 521 | if (!hw_stopped) |
| 522 | uport->ops->stop_tx(uport); |
| 523 | } else { |
| 524 | if (hw_stopped) |
| 525 | __uart_start(tty); |
| 526 | } |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 527 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
Peter Hurley | f5291ec | 2016-01-10 20:23:55 -0800 | [diff] [blame] | 530 | static int uart_put_char(struct tty_struct *tty, unsigned char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | { |
Peter Hurley | f5291ec | 2016-01-10 20:23:55 -0800 | [diff] [blame] | 532 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 533 | struct uart_port *port; |
Peter Hurley | f5291ec | 2016-01-10 20:23:55 -0800 | [diff] [blame] | 534 | struct circ_buf *circ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | unsigned long flags; |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 536 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Peter Hurley | f5291ec | 2016-01-10 20:23:55 -0800 | [diff] [blame] | 538 | circ = &state->xmit; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 539 | port = uart_port_lock(state, flags); |
Samir Virmani | aff9cf5 | 2019-01-16 10:28:07 -0800 | [diff] [blame] | 540 | if (!circ->buf) { |
| 541 | uart_port_unlock(port, flags); |
| 542 | return 0; |
| 543 | } |
| 544 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 545 | if (port && uart_circ_chars_free(circ) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | circ->buf[circ->head] = c; |
| 547 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 548 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 550 | uart_port_unlock(port, flags); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 551 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | static void uart_flush_chars(struct tty_struct *tty) |
| 555 | { |
| 556 | uart_start(tty); |
| 557 | } |
| 558 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 559 | static int uart_write(struct tty_struct *tty, |
| 560 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | { |
| 562 | struct uart_state *state = tty->driver_data; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 563 | struct uart_port *port; |
| 564 | struct circ_buf *circ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | unsigned long flags; |
| 566 | int c, ret = 0; |
| 567 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 568 | /* |
| 569 | * This means you called this function _after_ the port was |
| 570 | * closed. No cookie for you. |
| 571 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 572 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 573 | WARN_ON(1); |
| 574 | return -EL3HLT; |
| 575 | } |
| 576 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 577 | port = uart_port_lock(state, flags); |
Samir Virmani | aff9cf5 | 2019-01-16 10:28:07 -0800 | [diff] [blame] | 578 | circ = &state->xmit; |
| 579 | if (!circ->buf) { |
| 580 | uart_port_unlock(port, flags); |
| 581 | return 0; |
| 582 | } |
| 583 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 584 | while (port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
| 586 | if (count < c) |
| 587 | c = count; |
| 588 | if (c <= 0) |
| 589 | break; |
| 590 | memcpy(circ->buf + circ->head, buf, c); |
| 591 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); |
| 592 | buf += c; |
| 593 | count -= c; |
| 594 | ret += c; |
| 595 | } |
Peter Hurley | 64dbee3 | 2014-10-16 16:54:26 -0400 | [diff] [blame] | 596 | |
| 597 | __uart_start(tty); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 598 | uart_port_unlock(port, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | return ret; |
| 600 | } |
| 601 | |
Jiri Slaby | 03b3b1a | 2021-05-05 11:19:15 +0200 | [diff] [blame] | 602 | static unsigned int uart_write_room(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
| 604 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 605 | struct uart_port *port; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 606 | unsigned long flags; |
Jiri Slaby | 03b3b1a | 2021-05-05 11:19:15 +0200 | [diff] [blame] | 607 | unsigned int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 609 | port = uart_port_lock(state, flags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 610 | ret = uart_circ_chars_free(&state->xmit); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 611 | uart_port_unlock(port, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 612 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 615 | static unsigned int uart_chars_in_buffer(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
| 617 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 618 | struct uart_port *port; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 619 | unsigned long flags; |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 620 | unsigned int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 622 | port = uart_port_lock(state, flags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 623 | ret = uart_circ_chars_pending(&state->xmit); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 624 | uart_port_unlock(port, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 625 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | static void uart_flush_buffer(struct tty_struct *tty) |
| 629 | { |
| 630 | struct uart_state *state = tty->driver_data; |
Tetsuo Handa | 55d7b68 | 2008-05-06 20:42:27 -0700 | [diff] [blame] | 631 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | unsigned long flags; |
| 633 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 634 | /* |
| 635 | * This means you called this function _after_ the port was |
| 636 | * closed. No cookie for you. |
| 637 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 638 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 639 | WARN_ON(1); |
| 640 | return; |
| 641 | } |
| 642 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 643 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 645 | port = uart_port_lock(state, flags); |
| 646 | if (!port) |
| 647 | return; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 648 | uart_circ_clear(&state->xmit); |
Haavard Skinnemoen | 6bb0e3a | 2008-07-16 21:52:36 +0100 | [diff] [blame] | 649 | if (port->ops->flush_buffer) |
| 650 | port->ops->flush_buffer(port); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 651 | uart_port_unlock(port, flags); |
Rob Herring | d0f4bce | 2016-10-28 07:07:48 -0500 | [diff] [blame] | 652 | tty_port_tty_wakeup(&state->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | /* |
| 656 | * This function is used to send a high-priority XON/XOFF character to |
| 657 | * the device |
| 658 | */ |
| 659 | static void uart_send_xchar(struct tty_struct *tty, char ch) |
| 660 | { |
| 661 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 662 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | unsigned long flags; |
| 664 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 665 | port = uart_port_ref(state); |
| 666 | if (!port) |
| 667 | return; |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | if (port->ops->send_xchar) |
| 670 | port->ops->send_xchar(port, ch); |
| 671 | else { |
Peter Hurley | c235ccc | 2014-09-02 17:39:13 -0400 | [diff] [blame] | 672 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | port->x_char = ch; |
Peter Hurley | c235ccc | 2014-09-02 17:39:13 -0400 | [diff] [blame] | 674 | if (ch) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 675 | port->ops->start_tx(port); |
Peter Hurley | c235ccc | 2014-09-02 17:39:13 -0400 | [diff] [blame] | 676 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 678 | uart_port_deref(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | static void uart_throttle(struct tty_struct *tty) |
| 682 | { |
| 683 | struct uart_state *state = tty->driver_data; |
Jeremy Kerr | c5f78b1 | 2018-03-27 11:48:24 +0800 | [diff] [blame] | 684 | upstat_t mask = UPSTAT_SYNC_FIFO; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 685 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 687 | port = uart_port_ref(state); |
| 688 | if (!port) |
| 689 | return; |
| 690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | if (I_IXOFF(tty)) |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 692 | mask |= UPSTAT_AUTOXOFF; |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 693 | if (C_CRTSCTS(tty)) |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 694 | mask |= UPSTAT_AUTORTS; |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 695 | |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 696 | if (port->status & mask) { |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 697 | port->ops->throttle(port); |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 698 | mask &= ~port->status; |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 699 | } |
| 700 | |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 701 | if (mask & UPSTAT_AUTORTS) |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 702 | uart_clear_mctrl(port, TIOCM_RTS); |
Peter Hurley | b4749b9 | 2016-01-10 20:24:02 -0800 | [diff] [blame] | 703 | |
| 704 | if (mask & UPSTAT_AUTOXOFF) |
| 705 | uart_send_xchar(tty, STOP_CHAR(tty)); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 706 | |
| 707 | uart_port_deref(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | static void uart_unthrottle(struct tty_struct *tty) |
| 711 | { |
| 712 | struct uart_state *state = tty->driver_data; |
Jeremy Kerr | c5f78b1 | 2018-03-27 11:48:24 +0800 | [diff] [blame] | 713 | upstat_t mask = UPSTAT_SYNC_FIFO; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 714 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 716 | port = uart_port_ref(state); |
| 717 | if (!port) |
| 718 | return; |
| 719 | |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 720 | if (I_IXOFF(tty)) |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 721 | mask |= UPSTAT_AUTOXOFF; |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 722 | if (C_CRTSCTS(tty)) |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 723 | mask |= UPSTAT_AUTORTS; |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 724 | |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 725 | if (port->status & mask) { |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 726 | port->ops->unthrottle(port); |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 727 | mask &= ~port->status; |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 728 | } |
| 729 | |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 730 | if (mask & UPSTAT_AUTORTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | uart_set_mctrl(port, TIOCM_RTS); |
Peter Hurley | b4749b9 | 2016-01-10 20:24:02 -0800 | [diff] [blame] | 732 | |
| 733 | if (mask & UPSTAT_AUTOXOFF) |
| 734 | uart_send_xchar(tty, START_CHAR(tty)); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 735 | |
| 736 | uart_port_deref(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 739 | static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
Alan Cox | 9f10969 | 2012-10-29 15:20:25 +0000 | [diff] [blame] | 741 | struct uart_state *state = container_of(port, struct uart_state, port); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 742 | struct uart_port *uport; |
| 743 | int ret = -ENODEV; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 744 | |
Peter Hurley | 3abe8c7 | 2016-01-10 20:23:56 -0800 | [diff] [blame] | 745 | /* |
| 746 | * Ensure the state we copy is consistent and no hardware changes |
| 747 | * occur as we go |
| 748 | */ |
| 749 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 750 | uport = uart_port_check(state); |
| 751 | if (!uport) |
| 752 | goto out; |
| 753 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 754 | retinfo->type = uport->type; |
| 755 | retinfo->line = uport->line; |
| 756 | retinfo->port = uport->iobase; |
| 757 | if (HIGH_BITS_OFFSET) |
| 758 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
| 759 | retinfo->irq = uport->irq; |
Andy Shevchenko | a17e74c | 2017-07-25 20:39:57 +0300 | [diff] [blame] | 760 | retinfo->flags = (__force int)uport->flags; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 761 | retinfo->xmit_fifo_size = uport->fifosize; |
| 762 | retinfo->baud_base = uport->uartclk / 16; |
| 763 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; |
| 764 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 765 | ASYNC_CLOSING_WAIT_NONE : |
| 766 | jiffies_to_msecs(port->closing_wait) / 10; |
| 767 | retinfo->custom_divisor = uport->custom_divisor; |
| 768 | retinfo->hub6 = uport->hub6; |
| 769 | retinfo->io_type = uport->iotype; |
| 770 | retinfo->iomem_reg_shift = uport->regshift; |
| 771 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 772 | |
| 773 | ret = 0; |
| 774 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 775 | mutex_unlock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 776 | return ret; |
Alan Cox | 9f10969 | 2012-10-29 15:20:25 +0000 | [diff] [blame] | 777 | } |
| 778 | |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 779 | static int uart_get_info_user(struct tty_struct *tty, |
| 780 | struct serial_struct *ss) |
Alan Cox | 9f10969 | 2012-10-29 15:20:25 +0000 | [diff] [blame] | 781 | { |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 782 | struct uart_state *state = tty->driver_data; |
| 783 | struct tty_port *port = &state->port; |
Peter Hurley | 3abe8c7 | 2016-01-10 20:23:56 -0800 | [diff] [blame] | 784 | |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 785 | return uart_get_info(port, ss) < 0 ? -EIO : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 788 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
| 789 | struct uart_state *state, |
| 790 | struct serial_struct *new_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 792 | struct uart_port *uport = uart_port_check(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | unsigned long new_port; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 794 | unsigned int change_irq, change_port, closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | unsigned int old_custom_divisor, close_delay; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 796 | upf_t old_flags, new_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | int retval = 0; |
| 798 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 799 | if (!uport) |
| 800 | return -EIO; |
| 801 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 802 | new_port = new_info->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | if (HIGH_BITS_OFFSET) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 804 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 806 | new_info->irq = irq_canonicalize(new_info->irq); |
| 807 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); |
| 808 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Jiri Slaby | 4cb0fbf | 2011-11-09 21:33:45 +0100 | [diff] [blame] | 809 | ASYNC_CLOSING_WAIT_NONE : |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 810 | msecs_to_jiffies(new_info->closing_wait * 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 813 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 814 | && new_info->irq != uport->irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | /* |
| 817 | * Since changing the 'type' of the port changes its resource |
| 818 | * allocations, we should treat type changes the same as |
| 819 | * IO port changes. |
| 820 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 821 | change_port = !(uport->flags & UPF_FIXED_PORT) |
| 822 | && (new_port != uport->iobase || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 823 | (unsigned long)new_info->iomem_base != uport->mapbase || |
| 824 | new_info->hub6 != uport->hub6 || |
| 825 | new_info->io_type != uport->iotype || |
| 826 | new_info->iomem_reg_shift != uport->regshift || |
| 827 | new_info->type != uport->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 829 | old_flags = uport->flags; |
Andy Shevchenko | a17e74c | 2017-07-25 20:39:57 +0300 | [diff] [blame] | 830 | new_flags = (__force upf_t)new_info->flags; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 831 | old_custom_divisor = uport->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
| 833 | if (!capable(CAP_SYS_ADMIN)) { |
| 834 | retval = -EPERM; |
| 835 | if (change_irq || change_port || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 836 | (new_info->baud_base != uport->uartclk / 16) || |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 837 | (close_delay != port->close_delay) || |
| 838 | (closing_wait != port->closing_wait) || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 839 | (new_info->xmit_fifo_size && |
| 840 | new_info->xmit_fifo_size != uport->fifosize) || |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 841 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | goto exit; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 843 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 844 | (new_flags & UPF_USR_MASK)); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 845 | uport->custom_divisor = new_info->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | goto check_and_exit; |
| 847 | } |
| 848 | |
Ondrej Mosnacek | 5e722b2 | 2021-05-07 13:57:19 +0200 | [diff] [blame] | 849 | if (change_irq || change_port) { |
| 850 | retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); |
| 851 | if (retval) |
| 852 | goto exit; |
| 853 | } |
David Howells | 794edf3 | 2019-08-19 17:17:54 -0700 | [diff] [blame] | 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | /* |
| 856 | * Ask the low level driver to verify the settings. |
| 857 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 858 | if (uport->ops->verify_port) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 859 | retval = uport->ops->verify_port(uport, new_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 861 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
| 862 | (new_info->baud_base < 9600)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | retval = -EINVAL; |
| 864 | |
| 865 | if (retval) |
| 866 | goto exit; |
| 867 | |
| 868 | if (change_port || change_irq) { |
| 869 | retval = -EBUSY; |
| 870 | |
| 871 | /* |
| 872 | * Make sure that we are the sole user of this port. |
| 873 | */ |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 874 | if (tty_port_users(port) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | goto exit; |
| 876 | |
| 877 | /* |
| 878 | * We need to shutdown the serial port at the old |
| 879 | * port/type/irq combination. |
| 880 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 881 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | if (change_port) { |
| 885 | unsigned long old_iobase, old_mapbase; |
| 886 | unsigned int old_type, old_iotype, old_hub6, old_shift; |
| 887 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 888 | old_iobase = uport->iobase; |
| 889 | old_mapbase = uport->mapbase; |
| 890 | old_type = uport->type; |
| 891 | old_hub6 = uport->hub6; |
| 892 | old_iotype = uport->iotype; |
| 893 | old_shift = uport->regshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
| 895 | /* |
| 896 | * Free and release old regions |
| 897 | */ |
Fabio Estevam | a7cfaf1 | 2016-05-20 01:59:54 -0300 | [diff] [blame] | 898 | if (old_type != PORT_UNKNOWN && uport->ops->release_port) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 899 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 901 | uport->iobase = new_port; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 902 | uport->type = new_info->type; |
| 903 | uport->hub6 = new_info->hub6; |
| 904 | uport->iotype = new_info->io_type; |
| 905 | uport->regshift = new_info->iomem_reg_shift; |
| 906 | uport->mapbase = (unsigned long)new_info->iomem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | /* |
| 909 | * Claim and map the new regions |
| 910 | */ |
Fabio Estevam | a7cfaf1 | 2016-05-20 01:59:54 -0300 | [diff] [blame] | 911 | if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 912 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | } else { |
| 914 | /* Always success - Jean II */ |
| 915 | retval = 0; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * If we fail to request resources for the |
| 920 | * new port, try to restore the old settings. |
| 921 | */ |
Thomas Pfaff | 7deb39e | 2014-04-23 12:33:22 +0200 | [diff] [blame] | 922 | if (retval) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 923 | uport->iobase = old_iobase; |
| 924 | uport->type = old_type; |
| 925 | uport->hub6 = old_hub6; |
| 926 | uport->iotype = old_iotype; |
| 927 | uport->regshift = old_shift; |
| 928 | uport->mapbase = old_mapbase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
Thomas Pfaff | 7deb39e | 2014-04-23 12:33:22 +0200 | [diff] [blame] | 930 | if (old_type != PORT_UNKNOWN) { |
| 931 | retval = uport->ops->request_port(uport); |
| 932 | /* |
| 933 | * If we failed to restore the old settings, |
| 934 | * we fail like this. |
| 935 | */ |
| 936 | if (retval) |
| 937 | uport->type = PORT_UNKNOWN; |
| 938 | |
| 939 | /* |
| 940 | * We failed anyway. |
| 941 | */ |
| 942 | retval = -EBUSY; |
| 943 | } |
| 944 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 945 | /* Added to return the correct error -Ram Gupta */ |
| 946 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
| 948 | } |
| 949 | |
David Gibson | abb4a23 | 2007-05-06 14:48:49 -0700 | [diff] [blame] | 950 | if (change_irq) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 951 | uport->irq = new_info->irq; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 952 | if (!(uport->flags & UPF_FIXED_PORT)) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 953 | uport->uartclk = new_info->baud_base * 16; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 954 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 955 | (new_flags & UPF_CHANGE_MASK); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 956 | uport->custom_divisor = new_info->custom_divisor; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 957 | port->close_delay = close_delay; |
| 958 | port->closing_wait = closing_wait; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 959 | if (new_info->xmit_fifo_size) |
| 960 | uport->fifosize = new_info->xmit_fifo_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
| 962 | check_and_exit: |
| 963 | retval = 0; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 964 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | goto exit; |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 966 | if (tty_port_initialized(port)) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 967 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
| 968 | old_custom_divisor != uport->custom_divisor) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | /* |
| 970 | * If they're setting up a custom divisor or speed, |
Johan Hovold | dc2f727 | 2017-06-06 12:54:33 +0200 | [diff] [blame] | 971 | * instead of clearing it, then bitch about it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 973 | if (uport->flags & UPF_SPD_MASK) { |
Johan Hovold | dc2f727 | 2017-06-06 12:54:33 +0200 | [diff] [blame] | 974 | dev_notice_ratelimited(uport->dev, |
Sudip Mukherjee | 2f2dafe | 2014-09-01 20:49:43 +0530 | [diff] [blame] | 975 | "%s sets custom speed on %s. This is deprecated.\n", |
| 976 | current->comm, |
Rasmus Villemoes | 429b474 | 2015-03-31 15:55:59 +0200 | [diff] [blame] | 977 | tty_name(port->tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 979 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | } |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 981 | } else { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 982 | retval = uart_startup(tty, state, 1); |
Sebastian Andrzej Siewior | 44117a1 | 2018-01-11 18:57:26 +0100 | [diff] [blame] | 983 | if (retval == 0) |
| 984 | tty_port_set_initialized(port, true); |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 985 | if (retval > 0) |
| 986 | retval = 0; |
| 987 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | exit: |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 989 | return retval; |
| 990 | } |
| 991 | |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 992 | static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 993 | { |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 994 | struct uart_state *state = tty->driver_data; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 995 | struct tty_port *port = &state->port; |
| 996 | int retval; |
| 997 | |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 998 | down_write(&tty->termios_rwsem); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 999 | /* |
| 1000 | * This semaphore protects port->count. It is also |
| 1001 | * very useful to prevent opens. Also, take the |
| 1002 | * port configuration semaphore to make sure that a |
| 1003 | * module insertion/removal doesn't change anything |
| 1004 | * under us. |
| 1005 | */ |
| 1006 | mutex_lock(&port->mutex); |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 1007 | retval = uart_set_info(tty, port, state, ss); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1008 | mutex_unlock(&port->mutex); |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 1009 | up_write(&tty->termios_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | return retval; |
| 1011 | } |
| 1012 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1013 | /** |
| 1014 | * uart_get_lsr_info - get line status register info |
| 1015 | * @tty: tty associated with the UART |
| 1016 | * @state: UART being queried |
| 1017 | * @value: returned modem value |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1019 | static int uart_get_lsr_info(struct tty_struct *tty, |
| 1020 | struct uart_state *state, unsigned int __user *value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1022 | struct uart_port *uport = uart_port_check(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | unsigned int result; |
| 1024 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1025 | result = uport->ops->tx_empty(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
| 1027 | /* |
| 1028 | * If we're about to load something into the transmit |
| 1029 | * register, we'll pretend the transmitter isn't empty to |
| 1030 | * avoid a race condition (depending on when the transmit |
| 1031 | * interrupt happens). |
| 1032 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1033 | if (uport->x_char || |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1034 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
Peter Hurley | d01f4d1 | 2014-09-10 15:06:26 -0400 | [diff] [blame] | 1035 | !uart_tx_stopped(uport))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | result &= ~TIOCSER_TEMT; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1037 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | return put_user(result, value); |
| 1039 | } |
| 1040 | |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 1041 | static int uart_tiocmget(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | { |
| 1043 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1044 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1045 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | int result = -EIO; |
| 1047 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1048 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1049 | uport = uart_port_check(state); |
| 1050 | if (!uport) |
| 1051 | goto out; |
| 1052 | |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1053 | if (!tty_io_error(tty)) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1054 | result = uport->mctrl; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1055 | spin_lock_irq(&uport->lock); |
| 1056 | result |= uport->ops->get_mctrl(uport); |
| 1057 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | } |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1059 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1060 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | return result; |
| 1062 | } |
| 1063 | |
| 1064 | static int |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 1065 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | { |
| 1067 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1068 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1069 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | int ret = -EIO; |
| 1071 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1072 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1073 | uport = uart_port_check(state); |
| 1074 | if (!uport) |
| 1075 | goto out; |
| 1076 | |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1077 | if (!tty_io_error(tty)) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1078 | uart_update_mctrl(uport, set, clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | ret = 0; |
| 1080 | } |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1081 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1082 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | return ret; |
| 1084 | } |
| 1085 | |
Alan Cox | 9e98966c | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 1086 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | { |
| 1088 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1089 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1090 | struct uart_port *uport; |
| 1091 | int ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1093 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1094 | uport = uart_port_check(state); |
| 1095 | if (!uport) |
| 1096 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | |
Jiangfeng Xiao | 7d73170 | 2019-11-20 23:18:53 +0800 | [diff] [blame] | 1098 | if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1099 | uport->ops->break_ctl(uport, break_state); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1100 | ret = 0; |
| 1101 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1102 | mutex_unlock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1103 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | } |
| 1105 | |
Tamseel Shams | 4ed71ad | 2020-07-16 17:24:38 +0530 | [diff] [blame] | 1106 | static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1108 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1109 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | int flags, ret; |
| 1111 | |
| 1112 | if (!capable(CAP_SYS_ADMIN)) |
| 1113 | return -EPERM; |
| 1114 | |
| 1115 | /* |
| 1116 | * Take the per-port semaphore. This prevents count from |
| 1117 | * changing, and hence any extra opens of the port while |
| 1118 | * we're auto-configuring. |
| 1119 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1120 | if (mutex_lock_interruptible(&port->mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | return -ERESTARTSYS; |
| 1122 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1123 | uport = uart_port_check(state); |
| 1124 | if (!uport) { |
| 1125 | ret = -EIO; |
| 1126 | goto out; |
| 1127 | } |
| 1128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | ret = -EBUSY; |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 1130 | if (tty_port_users(port) == 1) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1131 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
| 1133 | /* |
| 1134 | * If we already have a port type configured, |
| 1135 | * we must release its resources. |
| 1136 | */ |
Fabio Estevam | a7cfaf1 | 2016-05-20 01:59:54 -0300 | [diff] [blame] | 1137 | if (uport->type != PORT_UNKNOWN && uport->ops->release_port) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1138 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
| 1140 | flags = UART_CONFIG_TYPE; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1141 | if (uport->flags & UPF_AUTO_IRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | flags |= UART_CONFIG_IRQ; |
| 1143 | |
| 1144 | /* |
| 1145 | * This will claim the ports resources if |
| 1146 | * a port is found. |
| 1147 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1148 | uport->ops->config_port(uport, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1150 | ret = uart_startup(tty, state, 1); |
Sebastian Andrzej Siewior | 7145690 | 2018-02-03 12:27:23 +0100 | [diff] [blame] | 1151 | if (ret == 0) |
| 1152 | tty_port_set_initialized(port, true); |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 1153 | if (ret > 0) |
| 1154 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1156 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1157 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | return ret; |
| 1159 | } |
| 1160 | |
Alexander Shiyan | 1fdc310 | 2014-06-03 18:54:43 +0400 | [diff] [blame] | 1161 | static void uart_enable_ms(struct uart_port *uport) |
| 1162 | { |
| 1163 | /* |
| 1164 | * Force modem status interrupts on |
| 1165 | */ |
| 1166 | if (uport->ops->enable_ms) |
| 1167 | uport->ops->enable_ms(uport); |
| 1168 | } |
| 1169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | /* |
| 1171 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1172 | * - mask passed in arg for lines of interest |
| 1173 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1174 | * Caller should use TIOCGICOUNT to see which one it was |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1175 | * |
| 1176 | * FIXME: This wants extracting into a common all driver implementation |
| 1177 | * of TIOCMWAIT using tty_port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | */ |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1179 | static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | { |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1181 | struct uart_port *uport; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1182 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | DECLARE_WAITQUEUE(wait, current); |
| 1184 | struct uart_icount cprev, cnow; |
| 1185 | int ret; |
| 1186 | |
| 1187 | /* |
| 1188 | * note the counters on entry |
| 1189 | */ |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1190 | uport = uart_port_ref(state); |
| 1191 | if (!uport) |
| 1192 | return -EIO; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1193 | spin_lock_irq(&uport->lock); |
| 1194 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); |
Alexander Shiyan | 1fdc310 | 2014-06-03 18:54:43 +0400 | [diff] [blame] | 1195 | uart_enable_ms(uport); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1196 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1198 | add_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | for (;;) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1200 | spin_lock_irq(&uport->lock); |
| 1201 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1202 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
| 1204 | set_current_state(TASK_INTERRUPTIBLE); |
| 1205 | |
| 1206 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1207 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1208 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1209 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1210 | ret = 0; |
| 1211 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | } |
| 1213 | |
| 1214 | schedule(); |
| 1215 | |
| 1216 | /* see if a signal did it */ |
| 1217 | if (signal_pending(current)) { |
| 1218 | ret = -ERESTARTSYS; |
| 1219 | break; |
| 1220 | } |
| 1221 | |
| 1222 | cprev = cnow; |
| 1223 | } |
Fabian Frederick | 97f9f70 | 2015-02-20 19:12:57 +0100 | [diff] [blame] | 1224 | __set_current_state(TASK_RUNNING); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1225 | remove_wait_queue(&port->delta_msr_wait, &wait); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1226 | uart_port_deref(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | |
| 1228 | return ret; |
| 1229 | } |
| 1230 | |
| 1231 | /* |
| 1232 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1233 | * Return: write counters to the user passed counter struct |
| 1234 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1235 | * RI where only 0->1 is counted. |
| 1236 | */ |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1237 | static int uart_get_icount(struct tty_struct *tty, |
| 1238 | struct serial_icounter_struct *icount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | { |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1240 | struct uart_state *state = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | struct uart_icount cnow; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1242 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1244 | uport = uart_port_ref(state); |
| 1245 | if (!uport) |
| 1246 | return -EIO; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1247 | spin_lock_irq(&uport->lock); |
| 1248 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1249 | spin_unlock_irq(&uport->lock); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1250 | uart_port_deref(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1252 | icount->cts = cnow.cts; |
| 1253 | icount->dsr = cnow.dsr; |
| 1254 | icount->rng = cnow.rng; |
| 1255 | icount->dcd = cnow.dcd; |
| 1256 | icount->rx = cnow.rx; |
| 1257 | icount->tx = cnow.tx; |
| 1258 | icount->frame = cnow.frame; |
| 1259 | icount->overrun = cnow.overrun; |
| 1260 | icount->parity = cnow.parity; |
| 1261 | icount->brk = cnow.brk; |
| 1262 | icount->buf_overrun = cnow.buf_overrun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1264 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1267 | static int uart_get_rs485_config(struct uart_port *port, |
| 1268 | struct serial_rs485 __user *rs485) |
| 1269 | { |
Ricardo Ribalda Delgado | bd737f8 | 2014-11-06 09:23:00 +0100 | [diff] [blame] | 1270 | unsigned long flags; |
| 1271 | struct serial_rs485 aux; |
| 1272 | |
| 1273 | spin_lock_irqsave(&port->lock, flags); |
| 1274 | aux = port->rs485; |
| 1275 | spin_unlock_irqrestore(&port->lock, flags); |
| 1276 | |
| 1277 | if (copy_to_user(rs485, &aux, sizeof(aux))) |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1278 | return -EFAULT; |
Ricardo Ribalda Delgado | bd737f8 | 2014-11-06 09:23:00 +0100 | [diff] [blame] | 1279 | |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1280 | return 0; |
| 1281 | } |
| 1282 | |
| 1283 | static int uart_set_rs485_config(struct uart_port *port, |
| 1284 | struct serial_rs485 __user *rs485_user) |
| 1285 | { |
| 1286 | struct serial_rs485 rs485; |
| 1287 | int ret; |
Ricardo Ribalda Delgado | bd737f8 | 2014-11-06 09:23:00 +0100 | [diff] [blame] | 1288 | unsigned long flags; |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1289 | |
| 1290 | if (!port->rs485_config) |
Johan Hovold | 79c5966 | 2021-04-07 11:52:08 +0200 | [diff] [blame] | 1291 | return -ENOTTY; |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1292 | |
| 1293 | if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) |
| 1294 | return -EFAULT; |
| 1295 | |
Ricardo Ribalda Delgado | bd737f8 | 2014-11-06 09:23:00 +0100 | [diff] [blame] | 1296 | spin_lock_irqsave(&port->lock, flags); |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1297 | ret = port->rs485_config(port, &rs485); |
Ricardo Ribalda Delgado | bd737f8 | 2014-11-06 09:23:00 +0100 | [diff] [blame] | 1298 | spin_unlock_irqrestore(&port->lock, flags); |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1299 | if (ret) |
| 1300 | return ret; |
| 1301 | |
| 1302 | if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) |
| 1303 | return -EFAULT; |
| 1304 | |
| 1305 | return 0; |
| 1306 | } |
| 1307 | |
Nicolas Ferre | ad8c0ea | 2018-09-26 14:58:47 +0200 | [diff] [blame] | 1308 | static int uart_get_iso7816_config(struct uart_port *port, |
| 1309 | struct serial_iso7816 __user *iso7816) |
| 1310 | { |
| 1311 | unsigned long flags; |
| 1312 | struct serial_iso7816 aux; |
| 1313 | |
| 1314 | if (!port->iso7816_config) |
Johan Hovold | 79c5966 | 2021-04-07 11:52:08 +0200 | [diff] [blame] | 1315 | return -ENOTTY; |
Nicolas Ferre | ad8c0ea | 2018-09-26 14:58:47 +0200 | [diff] [blame] | 1316 | |
| 1317 | spin_lock_irqsave(&port->lock, flags); |
| 1318 | aux = port->iso7816; |
| 1319 | spin_unlock_irqrestore(&port->lock, flags); |
| 1320 | |
| 1321 | if (copy_to_user(iso7816, &aux, sizeof(aux))) |
| 1322 | return -EFAULT; |
| 1323 | |
| 1324 | return 0; |
| 1325 | } |
| 1326 | |
| 1327 | static int uart_set_iso7816_config(struct uart_port *port, |
| 1328 | struct serial_iso7816 __user *iso7816_user) |
| 1329 | { |
| 1330 | struct serial_iso7816 iso7816; |
| 1331 | int i, ret; |
| 1332 | unsigned long flags; |
| 1333 | |
| 1334 | if (!port->iso7816_config) |
Johan Hovold | 79c5966 | 2021-04-07 11:52:08 +0200 | [diff] [blame] | 1335 | return -ENOTTY; |
Nicolas Ferre | ad8c0ea | 2018-09-26 14:58:47 +0200 | [diff] [blame] | 1336 | |
| 1337 | if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) |
| 1338 | return -EFAULT; |
| 1339 | |
| 1340 | /* |
| 1341 | * There are 5 words reserved for future use. Check that userspace |
| 1342 | * doesn't put stuff in there to prevent breakages in the future. |
| 1343 | */ |
| 1344 | for (i = 0; i < 5; i++) |
| 1345 | if (iso7816.reserved[i]) |
| 1346 | return -EINVAL; |
| 1347 | |
| 1348 | spin_lock_irqsave(&port->lock, flags); |
| 1349 | ret = port->iso7816_config(port, &iso7816); |
| 1350 | spin_unlock_irqrestore(&port->lock, flags); |
| 1351 | if (ret) |
| 1352 | return ret; |
| 1353 | |
| 1354 | if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) |
| 1355 | return -EFAULT; |
| 1356 | |
| 1357 | return 0; |
| 1358 | } |
| 1359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | /* |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1361 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | */ |
| 1363 | static int |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1364 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | { |
| 1366 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1367 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1368 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | void __user *uarg = (void __user *)arg; |
| 1370 | int ret = -ENOIOCTLCMD; |
| 1371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | |
| 1373 | /* |
| 1374 | * These ioctls don't rely on the hardware to be present. |
| 1375 | */ |
| 1376 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | case TIOCSERCONFIG: |
Peter Hurley | 7c8ab96 | 2014-10-16 16:54:20 -0400 | [diff] [blame] | 1378 | down_write(&tty->termios_rwsem); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1379 | ret = uart_do_autoconfig(tty, state); |
Peter Hurley | 7c8ab96 | 2014-10-16 16:54:20 -0400 | [diff] [blame] | 1380 | up_write(&tty->termios_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | } |
| 1383 | |
| 1384 | if (ret != -ENOIOCTLCMD) |
| 1385 | goto out; |
| 1386 | |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1387 | if (tty_io_error(tty)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | ret = -EIO; |
| 1389 | goto out; |
| 1390 | } |
| 1391 | |
| 1392 | /* |
| 1393 | * The following should only be used when hardware is present. |
| 1394 | */ |
| 1395 | switch (cmd) { |
| 1396 | case TIOCMIWAIT: |
| 1397 | ret = uart_wait_modem_status(state, arg); |
| 1398 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | } |
| 1400 | |
| 1401 | if (ret != -ENOIOCTLCMD) |
| 1402 | goto out; |
| 1403 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1404 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1405 | uport = uart_port_check(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1407 | if (!uport || tty_io_error(tty)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | ret = -EIO; |
| 1409 | goto out_up; |
| 1410 | } |
| 1411 | |
| 1412 | /* |
| 1413 | * All these rely on hardware being present and need to be |
| 1414 | * protected against the tty being hung up. |
| 1415 | */ |
Ricardo Ribalda Delgado | a9c20a9 | 2014-11-06 09:22:59 +0100 | [diff] [blame] | 1416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | switch (cmd) { |
Ricardo Ribalda Delgado | a9c20a9 | 2014-11-06 09:22:59 +0100 | [diff] [blame] | 1418 | case TIOCSERGETLSR: /* Get line status register */ |
| 1419 | ret = uart_get_lsr_info(tty, state, uarg); |
| 1420 | break; |
| 1421 | |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1422 | case TIOCGRS485: |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1423 | ret = uart_get_rs485_config(uport, uarg); |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1424 | break; |
| 1425 | |
| 1426 | case TIOCSRS485: |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1427 | ret = uart_set_rs485_config(uport, uarg); |
Ricardo Ribalda Delgado | a5f276f | 2014-11-06 22:46:13 +0100 | [diff] [blame] | 1428 | break; |
Nicolas Ferre | ad8c0ea | 2018-09-26 14:58:47 +0200 | [diff] [blame] | 1429 | |
| 1430 | case TIOCSISO7816: |
| 1431 | ret = uart_set_iso7816_config(state->uart_port, uarg); |
| 1432 | break; |
| 1433 | |
| 1434 | case TIOCGISO7816: |
| 1435 | ret = uart_get_iso7816_config(state->uart_port, uarg); |
| 1436 | break; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1437 | default: |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1438 | if (uport->ops->ioctl) |
| 1439 | ret = uport->ops->ioctl(uport, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | break; |
| 1441 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1442 | out_up: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1443 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1444 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | return ret; |
| 1446 | } |
| 1447 | |
Linus Torvalds | edeb280 | 2008-06-04 10:35:03 -0700 | [diff] [blame] | 1448 | static void uart_set_ldisc(struct tty_struct *tty) |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1449 | { |
| 1450 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1451 | struct uart_port *uport; |
Alexey Kardashevskiy | 2f70e49 | 2020-12-03 16:58:34 +1100 | [diff] [blame] | 1452 | struct tty_port *port = &state->port; |
| 1453 | |
| 1454 | if (!tty_port_initialized(port)) |
| 1455 | return; |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1456 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1457 | mutex_lock(&state->port.mutex); |
| 1458 | uport = uart_port_check(state); |
| 1459 | if (uport && uport->ops->set_ldisc) |
Peter Hurley | 732a84a | 2014-11-05 13:11:43 -0500 | [diff] [blame] | 1460 | uport->ops->set_ldisc(uport, &tty->termios); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1461 | mutex_unlock(&state->port.mutex); |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1462 | } |
| 1463 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1464 | static void uart_set_termios(struct tty_struct *tty, |
| 1465 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | { |
| 1467 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1468 | struct uart_port *uport; |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1469 | unsigned int cflag = tty->termios.c_cflag; |
Russell King | 2cbacaf | 2012-04-17 16:34:13 +0100 | [diff] [blame] | 1470 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
| 1471 | bool sw_changed = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1473 | mutex_lock(&state->port.mutex); |
| 1474 | uport = uart_port_check(state); |
| 1475 | if (!uport) |
| 1476 | goto out; |
| 1477 | |
Russell King | 2cbacaf | 2012-04-17 16:34:13 +0100 | [diff] [blame] | 1478 | /* |
| 1479 | * Drivers doing software flow control also need to know |
| 1480 | * about changes to these input settings. |
| 1481 | */ |
| 1482 | if (uport->flags & UPF_SOFT_FLOW) { |
| 1483 | iflag_mask |= IXANY|IXON|IXOFF; |
| 1484 | sw_changed = |
| 1485 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || |
| 1486 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; |
| 1487 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | /* |
| 1490 | * These are the bits that are used to setup various |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1491 | * flags in the low level driver. We can ignore the Bfoo |
| 1492 | * bits in c_cflag; c_[io]speed will always be set |
| 1493 | * appropriately by set_termios() in tty_ioctl.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | if ((cflag ^ old_termios->c_cflag) == 0 && |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1496 | tty->termios.c_ospeed == old_termios->c_ospeed && |
| 1497 | tty->termios.c_ispeed == old_termios->c_ispeed && |
Russell King | 2cbacaf | 2012-04-17 16:34:13 +0100 | [diff] [blame] | 1498 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
| 1499 | !sw_changed) { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1500 | goto out; |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1501 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1503 | uart_change_speed(tty, state, old_termios); |
Hariprasad Kelam | c7a6b9e | 2019-03-28 08:47:33 +0530 | [diff] [blame] | 1504 | /* reload cflag from termios; port driver may have overridden flags */ |
Peter Hurley | c18b55f | 2014-06-16 09:17:09 -0400 | [diff] [blame] | 1505 | cflag = tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
| 1507 | /* Handle transition to B0 status */ |
| 1508 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) |
Russell King | dec94e7 | 2012-09-24 11:13:15 +0100 | [diff] [blame] | 1509 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | /* Handle transition away from B0 status */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1511 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | unsigned int mask = TIOCM_DTR; |
Tamseel Shams | 4ed71ad | 2020-07-16 17:24:38 +0530 | [diff] [blame] | 1513 | |
Peter Hurley | 97ef38b | 2016-04-09 17:11:36 -0700 | [diff] [blame] | 1514 | if (!(cflag & CRTSCTS) || !tty_throttled(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | mask |= TIOCM_RTS; |
Russell King | dec94e7 | 2012-09-24 11:13:15 +0100 | [diff] [blame] | 1516 | uart_set_mctrl(uport, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | } |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1518 | out: |
| 1519 | mutex_unlock(&state->port.mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | } |
| 1521 | |
| 1522 | /* |
Kevin Cernekee | ef4f527 | 2012-12-26 20:43:41 -0800 | [diff] [blame] | 1523 | * Calls to uart_close() are serialised via the tty_lock in |
| 1524 | * drivers/tty/tty_io.c:tty_release() |
| 1525 | * drivers/tty/tty_io.c:do_tty_hangup() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | */ |
| 1527 | static void uart_close(struct tty_struct *tty, struct file *filp) |
| 1528 | { |
| 1529 | struct uart_state *state = tty->driver_data; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1530 | |
Peter Hurley | 91b32f5 | 2014-10-16 16:54:27 -0400 | [diff] [blame] | 1531 | if (!state) { |
| 1532 | struct uart_driver *drv = tty->driver->driver_state; |
Colin Ian King | 9356335 | 2017-11-01 10:49:23 +0000 | [diff] [blame] | 1533 | struct tty_port *port; |
Peter Hurley | 91b32f5 | 2014-10-16 16:54:27 -0400 | [diff] [blame] | 1534 | |
| 1535 | state = drv->state + tty->index; |
| 1536 | port = &state->port; |
| 1537 | spin_lock_irq(&port->lock); |
| 1538 | --port->count; |
| 1539 | spin_unlock_irq(&port->lock); |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1540 | return; |
Peter Hurley | 91b32f5 | 2014-10-16 16:54:27 -0400 | [diff] [blame] | 1541 | } |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1542 | |
Peter Hurley | 39b3d89 | 2016-01-10 20:23:57 -0800 | [diff] [blame] | 1543 | pr_debug("uart_close(%d) called\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1545 | tty_port_close(tty->port, tty, filp); |
| 1546 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1548 | static void uart_tty_port_shutdown(struct tty_port *port) |
| 1549 | { |
| 1550 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1551 | struct uart_port *uport = uart_port_check(state); |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | /* |
| 1554 | * At this point, we stop accepting input. To do this, we |
| 1555 | * disable the receive line status interrupts. |
| 1556 | */ |
Andy Shevchenko | a5a2b13 | 2016-09-13 00:23:42 +0300 | [diff] [blame] | 1557 | if (WARN(!uport, "detached port still initialized!\n")) |
| 1558 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | |
Andy Shevchenko | a5a2b13 | 2016-09-13 00:23:42 +0300 | [diff] [blame] | 1560 | spin_lock_irq(&uport->lock); |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1561 | uport->ops->stop_rx(uport); |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1562 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1564 | uart_port_shutdown(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
| 1566 | /* |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1567 | * It's possible for shutdown to be called after suspend if we get |
| 1568 | * a DCD drop (hangup) at just the right time. Clear suspended bit so |
| 1569 | * we don't try to resume a port that has been shutdown. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | */ |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1571 | tty_port_set_suspended(port, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 1573 | uart_change_pm(state, UART_PM_STATE_OFF); |
Peter Hurley | 2e75891 | 2014-10-16 16:54:19 -0400 | [diff] [blame] | 1574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | } |
| 1576 | |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1577 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | { |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1579 | struct uart_state *state = tty->driver_data; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1580 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | unsigned long char_time, expire; |
| 1582 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1583 | port = uart_port_ref(state); |
Andy Shevchenko | ef510be | 2016-11-24 14:18:55 +0200 | [diff] [blame] | 1584 | if (!port) |
| 1585 | return; |
| 1586 | |
| 1587 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) { |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1588 | uart_port_deref(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | return; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1590 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
| 1592 | /* |
| 1593 | * Set the check interval to be 1/5 of the estimated time to |
| 1594 | * send a single character, and make it at least 1. The check |
| 1595 | * interval should also be less than the timeout. |
| 1596 | * |
| 1597 | * Note: we have to use pretty tight timings here to satisfy |
| 1598 | * the NIST-PCTS. |
| 1599 | */ |
| 1600 | char_time = (port->timeout - HZ/50) / port->fifosize; |
| 1601 | char_time = char_time / 5; |
| 1602 | if (char_time == 0) |
| 1603 | char_time = 1; |
| 1604 | if (timeout && timeout < char_time) |
| 1605 | char_time = timeout; |
| 1606 | |
| 1607 | /* |
| 1608 | * If the transmitter hasn't cleared in twice the approximate |
| 1609 | * amount of time to send the entire FIFO, it probably won't |
| 1610 | * ever clear. This assumes the UART isn't doing flow |
| 1611 | * control, which is currently the case. Hence, if it ever |
| 1612 | * takes longer than port->timeout, this is probably due to a |
| 1613 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1614 | * 2*port->timeout. |
| 1615 | */ |
| 1616 | if (timeout == 0 || timeout > 2 * port->timeout) |
| 1617 | timeout = 2 * port->timeout; |
| 1618 | |
| 1619 | expire = jiffies + timeout; |
| 1620 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1621 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1622 | port->line, jiffies, expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | |
| 1624 | /* |
| 1625 | * Check whether the transmitter is empty every 'char_time'. |
| 1626 | * 'timeout' / 'expire' give us the maximum amount of time |
| 1627 | * we wait. |
| 1628 | */ |
| 1629 | while (!port->ops->tx_empty(port)) { |
| 1630 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1631 | if (signal_pending(current)) |
| 1632 | break; |
| 1633 | if (time_after(jiffies, expire)) |
| 1634 | break; |
| 1635 | } |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1636 | uart_port_deref(port); |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1637 | } |
| 1638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | /* |
Kevin Cernekee | ef4f527 | 2012-12-26 20:43:41 -0800 | [diff] [blame] | 1640 | * Calls to uart_hangup() are serialised by the tty_lock in |
| 1641 | * drivers/tty/tty_io.c:do_tty_hangup() |
| 1642 | * This runs from a workqueue and can sleep for a _short_ time only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | */ |
| 1644 | static void uart_hangup(struct tty_struct *tty) |
| 1645 | { |
| 1646 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1647 | struct tty_port *port = &state->port; |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1648 | struct uart_port *uport; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1649 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
Peter Hurley | 39b3d89 | 2016-01-10 20:23:57 -0800 | [diff] [blame] | 1651 | pr_debug("uart_hangup(%d)\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1653 | mutex_lock(&port->mutex); |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1654 | uport = uart_port_check(state); |
| 1655 | WARN(!uport, "hangup of detached port!\n"); |
| 1656 | |
Peter Hurley | 807c8d81 | 2016-04-09 17:53:22 -0700 | [diff] [blame] | 1657 | if (tty_port_active(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | uart_flush_buffer(tty); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1659 | uart_shutdown(tty, state); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1660 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1661 | port->count = 0; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1662 | spin_unlock_irqrestore(&port->lock, flags); |
Peter Hurley | 807c8d81 | 2016-04-09 17:53:22 -0700 | [diff] [blame] | 1663 | tty_port_set_active(port, 0); |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1664 | tty_port_tty_set(port, NULL); |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1665 | if (uport && !uart_console(uport)) |
Geert Uytterhoeven | bf903c0 | 2014-03-27 11:40:39 +0100 | [diff] [blame] | 1666 | uart_change_pm(state, UART_PM_STATE_OFF); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1667 | wake_up_interruptible(&port->open_wait); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1668 | wake_up_interruptible(&port->delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1670 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | } |
| 1672 | |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1673 | /* uport == NULL if uart_port has already been removed */ |
Jiri Slaby | 0b1db83 | 2011-11-09 21:33:50 +0100 | [diff] [blame] | 1674 | static void uart_port_shutdown(struct tty_port *port) |
| 1675 | { |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 1676 | struct uart_state *state = container_of(port, struct uart_state, port); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1677 | struct uart_port *uport = uart_port_check(state); |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 1678 | |
| 1679 | /* |
| 1680 | * clear delta_msr_wait queue to avoid mem leaks: we may free |
| 1681 | * the irq here so the queue might never be woken up. Note |
| 1682 | * that we won't end up waiting on delta_msr_wait again since |
| 1683 | * any outstanding file descriptors should be pointing at |
| 1684 | * hung_up_tty_fops now. |
| 1685 | */ |
| 1686 | wake_up_interruptible(&port->delta_msr_wait); |
| 1687 | |
| 1688 | /* |
| 1689 | * Free the IRQ and disable the port. |
| 1690 | */ |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1691 | if (uport) |
| 1692 | uport->ops->shutdown(uport); |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 1693 | |
| 1694 | /* |
| 1695 | * Ensure that the IRQ handler isn't running on another CPU. |
| 1696 | */ |
Peter Hurley | af224ca | 2016-04-09 18:56:35 -0700 | [diff] [blame] | 1697 | if (uport) |
| 1698 | synchronize_irq(uport->irq); |
Jiri Slaby | 0b1db83 | 2011-11-09 21:33:50 +0100 | [diff] [blame] | 1699 | } |
| 1700 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1701 | static int uart_carrier_raised(struct tty_port *port) |
| 1702 | { |
| 1703 | struct uart_state *state = container_of(port, struct uart_state, port); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1704 | struct uart_port *uport; |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1705 | int mctrl; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1706 | |
| 1707 | uport = uart_port_ref(state); |
| 1708 | /* |
| 1709 | * Should never observe uport == NULL since checks for hangup should |
| 1710 | * abort the tty_port_block_til_ready() loop before checking for carrier |
| 1711 | * raised -- but report carrier raised if it does anyway so open will |
| 1712 | * continue and not sleep |
| 1713 | */ |
| 1714 | if (WARN_ON(!uport)) |
| 1715 | return 1; |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1716 | spin_lock_irq(&uport->lock); |
Alexander Shiyan | 1fdc310 | 2014-06-03 18:54:43 +0400 | [diff] [blame] | 1717 | uart_enable_ms(uport); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1718 | mctrl = uport->ops->get_mctrl(uport); |
| 1719 | spin_unlock_irq(&uport->lock); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1720 | uart_port_deref(uport); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1721 | if (mctrl & TIOCM_CAR) |
| 1722 | return 1; |
| 1723 | return 0; |
| 1724 | } |
| 1725 | |
Rafael Gago | a6845e1 | 2017-07-31 10:46:42 +0200 | [diff] [blame] | 1726 | static void uart_dtr_rts(struct tty_port *port, int raise) |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1727 | { |
| 1728 | struct uart_state *state = container_of(port, struct uart_state, port); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1729 | struct uart_port *uport; |
| 1730 | |
| 1731 | uport = uart_port_ref(state); |
| 1732 | if (!uport) |
| 1733 | return; |
Rafael Gago | a6845e1 | 2017-07-31 10:46:42 +0200 | [diff] [blame] | 1734 | uart_port_dtr_rts(uport, raise); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 1735 | uart_port_deref(uport); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1736 | } |
| 1737 | |
Jiri Slaby | 4cdd17b | 2019-04-17 10:58:53 +0200 | [diff] [blame] | 1738 | static int uart_install(struct tty_driver *driver, struct tty_struct *tty) |
| 1739 | { |
| 1740 | struct uart_driver *drv = driver->driver_state; |
| 1741 | struct uart_state *state = drv->state + tty->index; |
| 1742 | |
| 1743 | tty->driver_data = state; |
| 1744 | |
| 1745 | return tty_standard_install(driver, tty); |
| 1746 | } |
| 1747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | /* |
Kevin Cernekee | ef4f527 | 2012-12-26 20:43:41 -0800 | [diff] [blame] | 1749 | * Calls to uart_open are serialised by the tty_lock in |
| 1750 | * drivers/tty/tty_io.c:tty_open() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | * Note that if this fails, then uart_close() _will_ be called. |
| 1752 | * |
| 1753 | * In time, we want to scrap the "opening nonpresent ports" |
| 1754 | * behaviour and implement an alternative way for setserial |
| 1755 | * to set base addresses/ports/types. This will allow us to |
| 1756 | * get rid of a certain amount of extra tests. |
| 1757 | */ |
| 1758 | static int uart_open(struct tty_struct *tty, struct file *filp) |
| 1759 | { |
Jiri Slaby | 4cdd17b | 2019-04-17 10:58:53 +0200 | [diff] [blame] | 1760 | struct uart_state *state = tty->driver_data; |
| 1761 | int retval; |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 1762 | |
| 1763 | retval = tty_port_open(&state->port, tty, filp); |
| 1764 | if (retval > 0) |
| 1765 | retval = 0; |
| 1766 | |
| 1767 | return retval; |
| 1768 | } |
| 1769 | |
| 1770 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
| 1771 | { |
| 1772 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1773 | struct uart_port *uport; |
Serge Semin | 13b18d3 | 2019-05-08 13:44:41 +0300 | [diff] [blame] | 1774 | int ret; |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 1775 | |
| 1776 | uport = uart_port_check(state); |
| 1777 | if (!uport || uport->flags & UPF_DEAD) |
| 1778 | return -ENXIO; |
| 1779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | * Start up the serial port. |
| 1782 | */ |
Serge Semin | 13b18d3 | 2019-05-08 13:44:41 +0300 | [diff] [blame] | 1783 | ret = uart_startup(tty, state, 0); |
| 1784 | if (ret > 0) |
| 1785 | tty_port_set_active(port, 1); |
| 1786 | |
| 1787 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | } |
| 1789 | |
| 1790 | static const char *uart_type(struct uart_port *port) |
| 1791 | { |
| 1792 | const char *str = NULL; |
| 1793 | |
| 1794 | if (port->ops->type) |
| 1795 | str = port->ops->type(port); |
| 1796 | |
| 1797 | if (!str) |
| 1798 | str = "unknown"; |
| 1799 | |
| 1800 | return str; |
| 1801 | } |
| 1802 | |
| 1803 | #ifdef CONFIG_PROC_FS |
| 1804 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1805 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | { |
| 1807 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1808 | struct tty_port *port = &state->port; |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 1809 | enum uart_pm_state pm_state; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1810 | struct uart_port *uport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | char stat_buf[32]; |
| 1812 | unsigned int status; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1813 | int mmio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1815 | mutex_lock(&port->mutex); |
| 1816 | uport = uart_port_check(state); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1817 | if (!uport) |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1818 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1820 | mmio = uport->iotype >= UPIO_MEM; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1821 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1822 | uport->line, uart_type(uport), |
Sergei Shtylyov | 6c6a233 | 2006-09-04 00:04:20 +0400 | [diff] [blame] | 1823 | mmio ? "mmio:0x" : "port:", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1824 | mmio ? (unsigned long long)uport->mapbase |
| 1825 | : (unsigned long long)uport->iobase, |
| 1826 | uport->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1828 | if (uport->type == PORT_UNKNOWN) { |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1829 | seq_putc(m, '\n'); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1830 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | } |
| 1832 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1833 | if (capable(CAP_SYS_ADMIN)) { |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1834 | pm_state = state->pm_state; |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 1835 | if (pm_state != UART_PM_STATE_ON) |
| 1836 | uart_change_pm(state, UART_PM_STATE_ON); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1837 | spin_lock_irq(&uport->lock); |
| 1838 | status = uport->ops->get_mctrl(uport); |
| 1839 | spin_unlock_irq(&uport->lock); |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 1840 | if (pm_state != UART_PM_STATE_ON) |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1841 | uart_change_pm(state, pm_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1843 | seq_printf(m, " tx:%d rx:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1844 | uport->icount.tx, uport->icount.rx); |
| 1845 | if (uport->icount.frame) |
Peter Hurley | 968af29 | 2016-01-10 20:24:01 -0800 | [diff] [blame] | 1846 | seq_printf(m, " fe:%d", uport->icount.frame); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1847 | if (uport->icount.parity) |
Peter Hurley | 968af29 | 2016-01-10 20:24:01 -0800 | [diff] [blame] | 1848 | seq_printf(m, " pe:%d", uport->icount.parity); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1849 | if (uport->icount.brk) |
Peter Hurley | 968af29 | 2016-01-10 20:24:01 -0800 | [diff] [blame] | 1850 | seq_printf(m, " brk:%d", uport->icount.brk); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1851 | if (uport->icount.overrun) |
Peter Hurley | 968af29 | 2016-01-10 20:24:01 -0800 | [diff] [blame] | 1852 | seq_printf(m, " oe:%d", uport->icount.overrun); |
Jeremy Kerr | 4f79409 | 2018-03-21 10:52:38 +0800 | [diff] [blame] | 1853 | if (uport->icount.buf_overrun) |
| 1854 | seq_printf(m, " bo:%d", uport->icount.buf_overrun); |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1855 | |
| 1856 | #define INFOBIT(bit, str) \ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1857 | if (uport->mctrl & (bit)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1859 | strlen(stat_buf) - 2) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1860 | #define STATBIT(bit, str) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | if (status & (bit)) \ |
| 1862 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1863 | strlen(stat_buf) - 2) |
| 1864 | |
| 1865 | stat_buf[0] = '\0'; |
| 1866 | stat_buf[1] = '\0'; |
| 1867 | INFOBIT(TIOCM_RTS, "|RTS"); |
| 1868 | STATBIT(TIOCM_CTS, "|CTS"); |
| 1869 | INFOBIT(TIOCM_DTR, "|DTR"); |
| 1870 | STATBIT(TIOCM_DSR, "|DSR"); |
| 1871 | STATBIT(TIOCM_CAR, "|CD"); |
| 1872 | STATBIT(TIOCM_RNG, "|RI"); |
| 1873 | if (stat_buf[0]) |
| 1874 | stat_buf[0] = ' '; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1875 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1876 | seq_puts(m, stat_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1878 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | #undef STATBIT |
| 1880 | #undef INFOBIT |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 1881 | out: |
| 1882 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | } |
| 1884 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1885 | static int uart_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | { |
Alexey Dobriyan | 833bb30 | 2009-04-02 01:30:04 +0400 | [diff] [blame] | 1887 | struct tty_driver *ttydrv = m->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | struct uart_driver *drv = ttydrv->driver_state; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1889 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | |
Peter Hurley | 968af29 | 2016-01-10 20:24:01 -0800 | [diff] [blame] | 1891 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1892 | for (i = 0; i < drv->nr; i++) |
| 1893 | uart_line_info(m, drv, i); |
| 1894 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | } |
| 1896 | #endif |
| 1897 | |
Andy Shevchenko | 7a49955 | 2020-02-14 13:43:32 +0200 | [diff] [blame] | 1898 | static inline bool uart_console_enabled(struct uart_port *port) |
| 1899 | { |
| 1900 | return uart_console(port) && (port->cons->flags & CON_ENABLED); |
| 1901 | } |
| 1902 | |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 1903 | static void uart_port_spin_lock_init(struct uart_port *port) |
Andy Shevchenko | f743061 | 2020-07-07 00:49:03 +0300 | [diff] [blame] | 1904 | { |
| 1905 | spin_lock_init(&port->lock); |
| 1906 | lockdep_set_class(&port->lock, &port_lock_key); |
| 1907 | } |
| 1908 | |
Andrew Morton | 4a1b550 | 2008-03-07 15:51:16 -0800 | [diff] [blame] | 1909 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
Peter Hurley | 1cfe42b | 2015-03-09 16:27:13 -0400 | [diff] [blame] | 1910 | /** |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1911 | * uart_console_write - write a console message to a serial port |
| 1912 | * @port: the port to write the message |
| 1913 | * @s: array of characters |
| 1914 | * @count: number of characters in string to write |
Peter Hurley | 10afbe3 | 2015-04-11 10:05:07 -0400 | [diff] [blame] | 1915 | * @putchar: function to write character to port |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1916 | */ |
| 1917 | void uart_console_write(struct uart_port *port, const char *s, |
| 1918 | unsigned int count, |
| 1919 | void (*putchar)(struct uart_port *, int)) |
| 1920 | { |
| 1921 | unsigned int i; |
| 1922 | |
| 1923 | for (i = 0; i < count; i++, s++) { |
| 1924 | if (*s == '\n') |
| 1925 | putchar(port, '\r'); |
| 1926 | putchar(port, *s); |
| 1927 | } |
| 1928 | } |
| 1929 | EXPORT_SYMBOL_GPL(uart_console_write); |
| 1930 | |
| 1931 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | * Check whether an invalid uart number has been specified, and |
| 1933 | * if so, search for the first available port that does have |
| 1934 | * console support. |
| 1935 | */ |
| 1936 | struct uart_port * __init |
| 1937 | uart_get_console(struct uart_port *ports, int nr, struct console *co) |
| 1938 | { |
| 1939 | int idx = co->index; |
| 1940 | |
| 1941 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && |
| 1942 | ports[idx].membase == NULL)) |
| 1943 | for (idx = 0; idx < nr; idx++) |
| 1944 | if (ports[idx].iobase != 0 || |
| 1945 | ports[idx].membase != NULL) |
| 1946 | break; |
| 1947 | |
| 1948 | co->index = idx; |
| 1949 | |
| 1950 | return ports + idx; |
| 1951 | } |
| 1952 | |
| 1953 | /** |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1954 | * uart_parse_earlycon - Parse earlycon options |
| 1955 | * @p: ptr to 2nd field (ie., just beyond '<name>,') |
| 1956 | * @iotype: ptr for decoded iotype (out) |
| 1957 | * @addr: ptr for decoded mapbase/iobase (out) |
| 1958 | * @options: ptr for <options> field; NULL if not present (out) |
| 1959 | * |
| 1960 | * Decodes earlycon kernel command line parameters of the form |
Masahiro Yamada | bd94c40 | 2015-10-28 12:46:05 +0900 | [diff] [blame] | 1961 | * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> |
| 1962 | * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1963 | * |
| 1964 | * The optional form |
Randy Dunlap | ff30283 | 2019-10-08 13:46:53 -0700 | [diff] [blame] | 1965 | * |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1966 | * earlycon=<name>,0x<addr>,<options> |
| 1967 | * console=<name>,0x<addr>,<options> |
Randy Dunlap | ff30283 | 2019-10-08 13:46:53 -0700 | [diff] [blame] | 1968 | * |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1969 | * is also accepted; the returned @iotype will be UPIO_MEM. |
| 1970 | * |
Alexander Sverdlin | 8b2303d | 2016-09-12 13:29:29 +0200 | [diff] [blame] | 1971 | * Returns 0 on success or -EINVAL on failure |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1972 | */ |
Alexander Sverdlin | 46e3668 | 2016-09-02 13:20:21 +0200 | [diff] [blame] | 1973 | int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1974 | char **options) |
| 1975 | { |
| 1976 | if (strncmp(p, "mmio,", 5) == 0) { |
| 1977 | *iotype = UPIO_MEM; |
| 1978 | p += 5; |
Masahiro Yamada | bd94c40 | 2015-10-28 12:46:05 +0900 | [diff] [blame] | 1979 | } else if (strncmp(p, "mmio16,", 7) == 0) { |
| 1980 | *iotype = UPIO_MEM16; |
| 1981 | p += 7; |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1982 | } else if (strncmp(p, "mmio32,", 7) == 0) { |
| 1983 | *iotype = UPIO_MEM32; |
| 1984 | p += 7; |
Noam Camus | 6e63be3 | 2015-05-25 06:54:28 +0300 | [diff] [blame] | 1985 | } else if (strncmp(p, "mmio32be,", 9) == 0) { |
| 1986 | *iotype = UPIO_MEM32BE; |
| 1987 | p += 9; |
Max Filippov | d215d80 | 2015-09-22 15:20:32 +0300 | [diff] [blame] | 1988 | } else if (strncmp(p, "mmio32native,", 13) == 0) { |
| 1989 | *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? |
| 1990 | UPIO_MEM32BE : UPIO_MEM32; |
| 1991 | p += 13; |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 1992 | } else if (strncmp(p, "io,", 3) == 0) { |
| 1993 | *iotype = UPIO_PORT; |
| 1994 | p += 3; |
| 1995 | } else if (strncmp(p, "0x", 2) == 0) { |
| 1996 | *iotype = UPIO_MEM; |
| 1997 | } else { |
| 1998 | return -EINVAL; |
| 1999 | } |
| 2000 | |
Alexander Sverdlin | 8b2303d | 2016-09-12 13:29:29 +0200 | [diff] [blame] | 2001 | /* |
| 2002 | * Before you replace it with kstrtoull(), think about options separator |
| 2003 | * (',') it will not tolerate |
| 2004 | */ |
| 2005 | *addr = simple_strtoull(p, NULL, 0); |
Peter Hurley | 73abaf8 | 2015-03-01 11:05:46 -0500 | [diff] [blame] | 2006 | p = strchr(p, ','); |
| 2007 | if (p) |
| 2008 | p++; |
| 2009 | |
| 2010 | *options = p; |
| 2011 | return 0; |
| 2012 | } |
| 2013 | EXPORT_SYMBOL_GPL(uart_parse_earlycon); |
| 2014 | |
| 2015 | /** |
Geert Uytterhoeven | 02088ca | 2014-03-11 11:23:35 +0100 | [diff] [blame] | 2016 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | * @options: pointer to option string |
| 2018 | * @baud: pointer to an 'int' variable for the baud rate. |
| 2019 | * @parity: pointer to an 'int' variable for the parity. |
| 2020 | * @bits: pointer to an 'int' variable for the number of data bits. |
| 2021 | * @flow: pointer to an 'int' variable for the flow control character. |
| 2022 | * |
| 2023 | * uart_parse_options decodes a string containing the serial console |
| 2024 | * options. The format of the string is <baud><parity><bits><flow>, |
| 2025 | * eg: 115200n8r |
| 2026 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2027 | void |
Paul Cercueil | 0f646b6 | 2017-12-28 14:07:07 +0100 | [diff] [blame] | 2028 | uart_parse_options(const char *options, int *baud, int *parity, |
| 2029 | int *bits, int *flow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | { |
Paul Cercueil | 0f646b6 | 2017-12-28 14:07:07 +0100 | [diff] [blame] | 2031 | const char *s = options; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | |
| 2033 | *baud = simple_strtoul(s, NULL, 10); |
| 2034 | while (*s >= '0' && *s <= '9') |
| 2035 | s++; |
| 2036 | if (*s) |
| 2037 | *parity = *s++; |
| 2038 | if (*s) |
| 2039 | *bits = *s++ - '0'; |
| 2040 | if (*s) |
| 2041 | *flow = *s; |
| 2042 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2043 | EXPORT_SYMBOL_GPL(uart_parse_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | /** |
| 2046 | * uart_set_options - setup the serial console parameters |
| 2047 | * @port: pointer to the serial ports uart_port structure |
| 2048 | * @co: console pointer |
| 2049 | * @baud: baud rate |
| 2050 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) |
| 2051 | * @bits: number of data bits |
| 2052 | * @flow: flow control character - 'r' (rts) |
| 2053 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2054 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | uart_set_options(struct uart_port *port, struct console *co, |
| 2056 | int baud, int parity, int bits, int flow) |
| 2057 | { |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2058 | struct ktermios termios; |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 2059 | static struct ktermios dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 2061 | /* |
| 2062 | * Ensure that the serial-console lock is initialised early. |
| 2063 | * |
| 2064 | * Note that the console-enabled check is needed because of kgdboc, |
| 2065 | * which can end up calling uart_set_options() for an already enabled |
| 2066 | * console via tty_find_polling_driver() and uart_poll_init(). |
| 2067 | */ |
| 2068 | if (!uart_console_enabled(port) && !port->console_reinit) |
| 2069 | uart_port_spin_lock_init(port); |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2070 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2071 | memset(&termios, 0, sizeof(struct ktermios)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | |
Jeffy Chen | ba47f97 | 2016-01-04 15:54:46 +0800 | [diff] [blame] | 2073 | termios.c_cflag |= CREAD | HUPCL | CLOCAL; |
| 2074 | tty_termios_encode_baud_rate(&termios, baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | |
| 2076 | if (bits == 7) |
| 2077 | termios.c_cflag |= CS7; |
| 2078 | else |
| 2079 | termios.c_cflag |= CS8; |
| 2080 | |
| 2081 | switch (parity) { |
| 2082 | case 'o': case 'O': |
| 2083 | termios.c_cflag |= PARODD; |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 2084 | fallthrough; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | case 'e': case 'E': |
| 2086 | termios.c_cflag |= PARENB; |
| 2087 | break; |
| 2088 | } |
| 2089 | |
| 2090 | if (flow == 'r') |
| 2091 | termios.c_cflag |= CRTSCTS; |
| 2092 | |
Yinghai Lu | 7949268 | 2007-07-15 23:37:25 -0700 | [diff] [blame] | 2093 | /* |
| 2094 | * some uarts on other side don't support no flow control. |
| 2095 | * So we set * DTR in host uart to make them happy |
| 2096 | */ |
| 2097 | port->mctrl |= TIOCM_DTR; |
| 2098 | |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 2099 | port->ops->set_termios(port, &termios, &dummy); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2100 | /* |
| 2101 | * Allow the setting of the UART parameters with a NULL console |
| 2102 | * too: |
| 2103 | */ |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 2104 | if (co) { |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2105 | co->cflag = termios.c_cflag; |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 2106 | co->ispeed = termios.c_ispeed; |
| 2107 | co->ospeed = termios.c_ospeed; |
| 2108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | |
| 2110 | return 0; |
| 2111 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2112 | EXPORT_SYMBOL_GPL(uart_set_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
| 2114 | |
Jiri Slaby | cf75525 | 2011-11-09 21:33:47 +0100 | [diff] [blame] | 2115 | /** |
| 2116 | * uart_change_pm - set power state of the port |
| 2117 | * |
| 2118 | * @state: port descriptor |
| 2119 | * @pm_state: new state |
| 2120 | * |
| 2121 | * Locking: port->mutex has to be held |
| 2122 | */ |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 2123 | static void uart_change_pm(struct uart_state *state, |
| 2124 | enum uart_pm_state pm_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 2126 | struct uart_port *port = uart_port_check(state); |
Andrew Victor | 1281e36 | 2006-05-16 11:28:49 +0100 | [diff] [blame] | 2127 | |
| 2128 | if (state->pm_state != pm_state) { |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 2129 | if (port && port->ops->pm) |
Andrew Victor | 1281e36 | 2006-05-16 11:28:49 +0100 | [diff] [blame] | 2130 | port->ops->pm(port, pm_state, state->pm_state); |
| 2131 | state->pm_state = pm_state; |
| 2132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | } |
| 2134 | |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2135 | struct uart_match { |
| 2136 | struct uart_port *port; |
| 2137 | struct uart_driver *driver; |
| 2138 | }; |
| 2139 | |
| 2140 | static int serial_match_port(struct device *dev, void *data) |
| 2141 | { |
| 2142 | struct uart_match *match = data; |
Guennadi Liakhovetski | 7ca796f | 2008-07-04 09:59:28 -0700 | [diff] [blame] | 2143 | struct tty_driver *tty_drv = match->driver->tty_driver; |
| 2144 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + |
| 2145 | match->port->line; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2146 | |
| 2147 | return dev->devt == devt; /* Actually, only one tty per port */ |
| 2148 | } |
| 2149 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2150 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2152 | struct uart_state *state = drv->state + uport->line; |
| 2153 | struct tty_port *port = &state->port; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2154 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2155 | struct uart_match match = {uport, drv}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2157 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2159 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
Lucas Stach | 88e2582 | 2017-05-11 12:56:14 +0200 | [diff] [blame] | 2160 | if (tty_dev && device_may_wakeup(tty_dev)) { |
Andy Shevchenko | aef3ad1 | 2017-08-13 17:47:42 +0300 | [diff] [blame] | 2161 | enable_irq_wake(uport->irq); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2162 | put_device(tty_dev); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2163 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2164 | return 0; |
| 2165 | } |
Federico Vaga | 5a65dcc0 | 2013-04-15 16:01:07 +0200 | [diff] [blame] | 2166 | put_device(tty_dev); |
| 2167 | |
Peter Hurley | b164c97 | 2015-01-22 12:24:25 -0500 | [diff] [blame] | 2168 | /* Nothing to do if the console is not suspending */ |
| 2169 | if (!console_suspend_enabled && uart_console(uport)) |
| 2170 | goto unlock; |
| 2171 | |
| 2172 | uport->suspended = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2173 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 2174 | if (tty_port_initialized(port)) { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2175 | const struct uart_ops *ops = uport->ops; |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 2176 | int tries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | |
Peter Hurley | 80f02d5 | 2016-04-09 17:53:24 -0700 | [diff] [blame] | 2178 | tty_port_set_suspended(port, 1); |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 2179 | tty_port_set_initialized(port, 0); |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2180 | |
Peter Hurley | b164c97 | 2015-01-22 12:24:25 -0500 | [diff] [blame] | 2181 | spin_lock_irq(&uport->lock); |
| 2182 | ops->stop_tx(uport); |
| 2183 | ops->set_mctrl(uport, 0); |
| 2184 | ops->stop_rx(uport); |
| 2185 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | |
| 2187 | /* |
| 2188 | * Wait for the transmitter to empty. |
| 2189 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2190 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | msleep(10); |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 2192 | if (!tries) |
Andy Shevchenko | cade358 | 2017-03-31 21:35:18 +0300 | [diff] [blame] | 2193 | dev_err(uport->dev, "%s: Unable to drain transmitter\n", |
| 2194 | uport->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | |
Peter Hurley | b164c97 | 2015-01-22 12:24:25 -0500 | [diff] [blame] | 2196 | ops->shutdown(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | } |
| 2198 | |
| 2199 | /* |
| 2200 | * Disable the console device before suspending. |
| 2201 | */ |
Peter Hurley | b164c97 | 2015-01-22 12:24:25 -0500 | [diff] [blame] | 2202 | if (uart_console(uport)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2203 | console_stop(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | |
Peter Hurley | b164c97 | 2015-01-22 12:24:25 -0500 | [diff] [blame] | 2205 | uart_change_pm(state, UART_PM_STATE_OFF); |
| 2206 | unlock: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2207 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | |
| 2209 | return 0; |
| 2210 | } |
| 2211 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2212 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2214 | struct uart_state *state = drv->state + uport->line; |
| 2215 | struct tty_port *port = &state->port; |
Arjan van de Ven | 03a74dc | 2008-05-23 13:04:49 -0700 | [diff] [blame] | 2216 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2217 | struct uart_match match = {uport, drv}; |
Deepak Saxena | ba15ab0 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 2218 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2220 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2222 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
| 2223 | if (!uport->suspended && device_may_wakeup(tty_dev)) { |
Andy Shevchenko | aef3ad1 | 2017-08-13 17:47:42 +0300 | [diff] [blame] | 2224 | if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 2225 | disable_irq_wake(uport->irq); |
Federico Vaga | 5a65dcc0 | 2013-04-15 16:01:07 +0200 | [diff] [blame] | 2226 | put_device(tty_dev); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2227 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2228 | return 0; |
| 2229 | } |
Federico Vaga | 5a65dcc0 | 2013-04-15 16:01:07 +0200 | [diff] [blame] | 2230 | put_device(tty_dev); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2231 | uport->suspended = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | /* |
| 2234 | * Re-enable the console device after suspending. |
| 2235 | */ |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 2236 | if (uart_console(uport)) { |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 2237 | /* |
| 2238 | * First try to use the console cflag setting. |
| 2239 | */ |
| 2240 | memset(&termios, 0, sizeof(struct ktermios)); |
| 2241 | termios.c_cflag = uport->cons->cflag; |
Pali Rohár | 027b571 | 2021-10-02 15:09:00 +0200 | [diff] [blame] | 2242 | termios.c_ispeed = uport->cons->ispeed; |
| 2243 | termios.c_ospeed = uport->cons->ospeed; |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 2244 | |
| 2245 | /* |
| 2246 | * If that's unset, use the tty termios setting. |
| 2247 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2248 | if (port->tty && termios.c_cflag == 0) |
| 2249 | termios = port->tty->termios; |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 2250 | |
Ning Jiang | 94abc56 | 2011-09-05 16:28:18 +0800 | [diff] [blame] | 2251 | if (console_suspend_enabled) |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 2252 | uart_change_pm(state, UART_PM_STATE_ON); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2253 | uport->ops->set_termios(uport, &termios, NULL); |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 2254 | if (console_suspend_enabled) |
| 2255 | console_start(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | } |
| 2257 | |
Peter Hurley | 80f02d5 | 2016-04-09 17:53:24 -0700 | [diff] [blame] | 2258 | if (tty_port_suspended(port)) { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2259 | const struct uart_ops *ops = uport->ops; |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2260 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 2262 | uart_change_pm(state, UART_PM_STATE_ON); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2263 | spin_lock_irq(&uport->lock); |
| 2264 | ops->set_mctrl(uport, 0); |
| 2265 | spin_unlock_irq(&uport->lock); |
Stanislav Brabec | 4547be78 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2266 | if (console_suspend_enabled || !uart_console(uport)) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2267 | /* Protected by port mutex for now */ |
| 2268 | struct tty_struct *tty = port->tty; |
Tamseel Shams | 4ed71ad | 2020-07-16 17:24:38 +0530 | [diff] [blame] | 2269 | |
Stanislav Brabec | 4547be78 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2270 | ret = ops->startup(uport); |
| 2271 | if (ret == 0) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2272 | if (tty) |
| 2273 | uart_change_speed(tty, state, NULL); |
Stanislav Brabec | 4547be78 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2274 | spin_lock_irq(&uport->lock); |
| 2275 | ops->set_mctrl(uport, uport->mctrl); |
| 2276 | ops->start_tx(uport); |
| 2277 | spin_unlock_irq(&uport->lock); |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 2278 | tty_port_set_initialized(port, 1); |
Stanislav Brabec | 4547be78 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2279 | } else { |
| 2280 | /* |
| 2281 | * Failed to resume - maybe hardware went away? |
| 2282 | * Clear the "initialized" flag so we won't try |
| 2283 | * to call the low level drivers shutdown method. |
| 2284 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2285 | uart_shutdown(tty, state); |
Stanislav Brabec | 4547be78 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2286 | } |
Russell King | ee31b337 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2287 | } |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2288 | |
Peter Hurley | 80f02d5 | 2016-04-09 17:53:24 -0700 | [diff] [blame] | 2289 | tty_port_set_suspended(port, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2292 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | |
| 2294 | return 0; |
| 2295 | } |
| 2296 | |
| 2297 | static inline void |
| 2298 | uart_report_port(struct uart_driver *drv, struct uart_port *port) |
| 2299 | { |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2300 | char address[64]; |
| 2301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | switch (port->iotype) { |
| 2303 | case UPIO_PORT: |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2304 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | break; |
| 2306 | case UPIO_HUB6: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2307 | snprintf(address, sizeof(address), |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2308 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | break; |
| 2310 | case UPIO_MEM: |
Masahiro Yamada | bd94c40 | 2015-10-28 12:46:05 +0900 | [diff] [blame] | 2311 | case UPIO_MEM16: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | case UPIO_MEM32: |
Kevin Cernekee | 3ffb1a8 | 2014-11-12 12:53:59 -0800 | [diff] [blame] | 2313 | case UPIO_MEM32BE: |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 2314 | case UPIO_AU: |
Zang Roy-r61911 | 3be91ec | 2006-06-30 02:29:58 -0700 | [diff] [blame] | 2315 | case UPIO_TSI: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2316 | snprintf(address, sizeof(address), |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 2317 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2318 | break; |
| 2319 | default: |
| 2320 | strlcpy(address, "*unknown*", sizeof(address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | break; |
| 2322 | } |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2323 | |
Andy Shevchenko | cade358 | 2017-03-31 21:35:18 +0300 | [diff] [blame] | 2324 | pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", |
James Bottomley | 68ed7e1 | 2015-01-02 10:05:13 -0800 | [diff] [blame] | 2325 | port->dev ? dev_name(port->dev) : "", |
| 2326 | port->dev ? ": " : "", |
Andy Shevchenko | cade358 | 2017-03-31 21:35:18 +0300 | [diff] [blame] | 2327 | port->name, |
Kees Cook | 7d12b97 | 2013-07-12 13:07:39 -0700 | [diff] [blame] | 2328 | address, port->irq, port->uartclk / 16, uart_type(port)); |
Maciej W. Rozycki | e7b9193 | 2021-06-26 06:11:21 +0200 | [diff] [blame] | 2329 | |
| 2330 | /* The magic multiplier feature is a bit obscure, so report it too. */ |
| 2331 | if (port->flags & UPF_MAGIC_MULTIPLIER) |
| 2332 | pr_info("%s%s%s extra baud rates supported: %d, %d", |
| 2333 | port->dev ? dev_name(port->dev) : "", |
| 2334 | port->dev ? ": " : "", |
| 2335 | port->name, |
| 2336 | port->uartclk / 8, port->uartclk / 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | } |
| 2338 | |
| 2339 | static void |
| 2340 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, |
| 2341 | struct uart_port *port) |
| 2342 | { |
| 2343 | unsigned int flags; |
| 2344 | |
| 2345 | /* |
| 2346 | * If there isn't a port here, don't do anything further. |
| 2347 | */ |
| 2348 | if (!port->iobase && !port->mapbase && !port->membase) |
| 2349 | return; |
| 2350 | |
| 2351 | /* |
| 2352 | * Now do the auto configuration stuff. Note that config_port |
| 2353 | * is expected to claim the resources and map the port for us. |
| 2354 | */ |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2355 | flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | if (port->flags & UPF_AUTO_IRQ) |
| 2357 | flags |= UART_CONFIG_IRQ; |
| 2358 | if (port->flags & UPF_BOOT_AUTOCONF) { |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2359 | if (!(port->flags & UPF_FIXED_TYPE)) { |
| 2360 | port->type = PORT_UNKNOWN; |
| 2361 | flags |= UART_CONFIG_TYPE; |
| 2362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | port->ops->config_port(port, flags); |
| 2364 | } |
| 2365 | |
| 2366 | if (port->type != PORT_UNKNOWN) { |
| 2367 | unsigned long flags; |
| 2368 | |
| 2369 | uart_report_port(drv, port); |
| 2370 | |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 2371 | /* Power up port for set_mctrl() */ |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 2372 | uart_change_pm(state, UART_PM_STATE_ON); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 2373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | /* |
| 2375 | * Ensure that the modem control lines are de-activated. |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2376 | * keep the DTR setting that is set in uart_set_options() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | * We probably don't need a spinlock around this, but |
| 2378 | */ |
| 2379 | spin_lock_irqsave(&port->lock, flags); |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2380 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | spin_unlock_irqrestore(&port->lock, flags); |
| 2382 | |
| 2383 | /* |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2384 | * If this driver supports console, and it hasn't been |
| 2385 | * successfully registered yet, try to re-register it. |
| 2386 | * It may be that the port was not available. |
| 2387 | */ |
| 2388 | if (port->cons && !(port->cons->flags & CON_ENABLED)) |
| 2389 | register_console(port->cons); |
| 2390 | |
| 2391 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | * Power down all ports by default, except the |
| 2393 | * console if we have one. |
| 2394 | */ |
| 2395 | if (!uart_console(port)) |
Linus Walleij | 6f538fe | 2012-12-07 11:36:08 +0100 | [diff] [blame] | 2396 | uart_change_pm(state, UART_PM_STATE_OFF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2397 | } |
| 2398 | } |
| 2399 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2400 | #ifdef CONFIG_CONSOLE_POLL |
| 2401 | |
| 2402 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) |
| 2403 | { |
| 2404 | struct uart_driver *drv = driver->driver_state; |
| 2405 | struct uart_state *state = drv->state + line; |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2406 | struct tty_port *tport; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2407 | struct uart_port *port; |
| 2408 | int baud = 9600; |
| 2409 | int bits = 8; |
| 2410 | int parity = 'n'; |
| 2411 | int flow = 'n'; |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2412 | int ret = 0; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2413 | |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2414 | tport = &state->port; |
| 2415 | mutex_lock(&tport->mutex); |
| 2416 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 2417 | port = uart_port_check(state); |
| 2418 | if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2419 | ret = -1; |
| 2420 | goto out; |
| 2421 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2422 | |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2423 | if (port->ops->poll_init) { |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2424 | /* |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 2425 | * We don't set initialized as we only initialized the hw, |
| 2426 | * e.g. state->xmit is still uninitialized. |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2427 | */ |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 2428 | if (!tty_port_initialized(tport)) |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2429 | ret = port->ops->poll_init(port); |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2430 | } |
| 2431 | |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2432 | if (!ret && options) { |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2433 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2434 | ret = uart_set_options(port, NULL, baud, parity, bits, flow); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2435 | } |
Peter Hurley | 49c0230 | 2016-04-09 18:56:32 -0700 | [diff] [blame] | 2436 | out: |
| 2437 | mutex_unlock(&tport->mutex); |
| 2438 | return ret; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2439 | } |
| 2440 | |
| 2441 | static int uart_poll_get_char(struct tty_driver *driver, int line) |
| 2442 | { |
| 2443 | struct uart_driver *drv = driver->driver_state; |
| 2444 | struct uart_state *state = drv->state + line; |
| 2445 | struct uart_port *port; |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2446 | int ret = -1; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2447 | |
Jiri Slaby | 22077b0 | 2017-03-15 12:00:23 +0100 | [diff] [blame] | 2448 | port = uart_port_ref(state); |
| 2449 | if (port) { |
| 2450 | ret = port->ops->poll_get_char(port); |
| 2451 | uart_port_deref(port); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2452 | } |
Jiri Slaby | 22077b0 | 2017-03-15 12:00:23 +0100 | [diff] [blame] | 2453 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2454 | return ret; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2455 | } |
| 2456 | |
| 2457 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) |
| 2458 | { |
| 2459 | struct uart_driver *drv = driver->driver_state; |
| 2460 | struct uart_state *state = drv->state + line; |
| 2461 | struct uart_port *port; |
| 2462 | |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2463 | port = uart_port_ref(state); |
| 2464 | if (!port) |
| 2465 | return; |
Doug Anderson | c7d44a0 | 2014-04-21 10:06:43 -0700 | [diff] [blame] | 2466 | |
| 2467 | if (ch == '\n') |
| 2468 | port->ops->poll_put_char(port, '\r'); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2469 | port->ops->poll_put_char(port, ch); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2470 | uart_port_deref(port); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2471 | } |
| 2472 | #endif |
| 2473 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 2474 | static const struct tty_operations uart_ops = { |
Jiri Slaby | 4cdd17b | 2019-04-17 10:58:53 +0200 | [diff] [blame] | 2475 | .install = uart_install, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | .open = uart_open, |
| 2477 | .close = uart_close, |
| 2478 | .write = uart_write, |
| 2479 | .put_char = uart_put_char, |
| 2480 | .flush_chars = uart_flush_chars, |
| 2481 | .write_room = uart_write_room, |
| 2482 | .chars_in_buffer= uart_chars_in_buffer, |
| 2483 | .flush_buffer = uart_flush_buffer, |
| 2484 | .ioctl = uart_ioctl, |
| 2485 | .throttle = uart_throttle, |
| 2486 | .unthrottle = uart_unthrottle, |
| 2487 | .send_xchar = uart_send_xchar, |
| 2488 | .set_termios = uart_set_termios, |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 2489 | .set_ldisc = uart_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | .stop = uart_stop, |
| 2491 | .start = uart_start, |
| 2492 | .hangup = uart_hangup, |
| 2493 | .break_ctl = uart_break_ctl, |
| 2494 | .wait_until_sent= uart_wait_until_sent, |
| 2495 | #ifdef CONFIG_PROC_FS |
Christoph Hellwig | 8a8dcab | 2018-04-13 21:04:45 +0200 | [diff] [blame] | 2496 | .proc_show = uart_proc_show, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | #endif |
| 2498 | .tiocmget = uart_tiocmget, |
| 2499 | .tiocmset = uart_tiocmset, |
Al Viro | 5099d23 | 2018-09-11 22:29:55 -0400 | [diff] [blame] | 2500 | .set_serial = uart_set_info_user, |
| 2501 | .get_serial = uart_get_info_user, |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 2502 | .get_icount = uart_get_icount, |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2503 | #ifdef CONFIG_CONSOLE_POLL |
| 2504 | .poll_init = uart_poll_init, |
| 2505 | .poll_get_char = uart_poll_get_char, |
| 2506 | .poll_put_char = uart_poll_put_char, |
| 2507 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | }; |
| 2509 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2510 | static const struct tty_port_operations uart_port_ops = { |
| 2511 | .carrier_raised = uart_carrier_raised, |
| 2512 | .dtr_rts = uart_dtr_rts, |
Rob Herring | b3b5764 | 2016-08-22 17:39:09 -0500 | [diff] [blame] | 2513 | .activate = uart_port_activate, |
Rob Herring | 761ed4a | 2016-08-22 17:39:10 -0500 | [diff] [blame] | 2514 | .shutdown = uart_tty_port_shutdown, |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2515 | }; |
| 2516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | /** |
| 2518 | * uart_register_driver - register a driver with the uart core layer |
| 2519 | * @drv: low level driver structure |
| 2520 | * |
| 2521 | * Register a uart driver with the core driver. We in turn register |
| 2522 | * with the tty layer, and initialise the core driver per-port state. |
| 2523 | * |
| 2524 | * We have a proc file in /proc/tty/driver which is named after the |
| 2525 | * normal driver. |
| 2526 | * |
| 2527 | * drv->port should be NULL, and the per-port structures should be |
| 2528 | * registered using uart_add_one_port after this call has succeeded. |
| 2529 | */ |
| 2530 | int uart_register_driver(struct uart_driver *drv) |
| 2531 | { |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2532 | struct tty_driver *normal; |
Sergey Organov | 050dfc0 | 2019-04-23 08:06:58 +0300 | [diff] [blame] | 2533 | int i, retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2534 | |
| 2535 | BUG_ON(drv->state); |
| 2536 | |
| 2537 | /* |
| 2538 | * Maybe we should be using a slab cache for this, especially if |
| 2539 | * we have a large number of ports to handle. |
| 2540 | */ |
Kees Cook | 6396bb2 | 2018-06-12 14:03:40 -0700 | [diff] [blame] | 2541 | drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | if (!drv->state) |
| 2543 | goto out; |
| 2544 | |
Jiri Slaby | 39b7b42 | 2021-07-23 09:43:13 +0200 | [diff] [blame] | 2545 | normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | |
| 2546 | TTY_DRIVER_DYNAMIC_DEV); |
| 2547 | if (IS_ERR(normal)) { |
| 2548 | retval = PTR_ERR(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2549 | goto out_kfree; |
Jiri Slaby | 39b7b42 | 2021-07-23 09:43:13 +0200 | [diff] [blame] | 2550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | |
| 2552 | drv->tty_driver = normal; |
| 2553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | normal->driver_name = drv->driver_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | normal->name = drv->dev_name; |
| 2556 | normal->major = drv->major; |
| 2557 | normal->minor_start = drv->minor; |
| 2558 | normal->type = TTY_DRIVER_TYPE_SERIAL; |
| 2559 | normal->subtype = SERIAL_TYPE_NORMAL; |
| 2560 | normal->init_termios = tty_std_termios; |
| 2561 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2562 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | normal->driver_state = drv; |
| 2564 | tty_set_operations(normal, &uart_ops); |
| 2565 | |
| 2566 | /* |
| 2567 | * Initialise the UART state(s). |
| 2568 | */ |
| 2569 | for (i = 0; i < drv->nr; i++) { |
| 2570 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2571 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2573 | tty_port_init(port); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2574 | port->ops = &uart_port_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2575 | } |
| 2576 | |
| 2577 | retval = tty_register_driver(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2578 | if (retval >= 0) |
| 2579 | return retval; |
| 2580 | |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 2581 | for (i = 0; i < drv->nr; i++) |
| 2582 | tty_port_destroy(&drv->state[i].port); |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 2583 | tty_driver_kref_put(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2584 | out_kfree: |
| 2585 | kfree(drv->state); |
| 2586 | out: |
Sergey Organov | 050dfc0 | 2019-04-23 08:06:58 +0300 | [diff] [blame] | 2587 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | /** |
| 2591 | * uart_unregister_driver - remove a driver from the uart core layer |
| 2592 | * @drv: low level driver structure |
| 2593 | * |
| 2594 | * Remove all references to a driver from the core driver. The low |
| 2595 | * level driver must have removed all its ports via the |
| 2596 | * uart_remove_one_port() if it registered them with uart_add_one_port(). |
| 2597 | * (ie, drv->port == NULL) |
| 2598 | */ |
| 2599 | void uart_unregister_driver(struct uart_driver *drv) |
| 2600 | { |
| 2601 | struct tty_driver *p = drv->tty_driver; |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 2602 | unsigned int i; |
| 2603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | tty_unregister_driver(p); |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 2605 | tty_driver_kref_put(p); |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 2606 | for (i = 0; i < drv->nr; i++) |
| 2607 | tty_port_destroy(&drv->state[i].port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | kfree(drv->state); |
Alan Cox | 1e66cde | 2012-05-14 14:51:22 +0100 | [diff] [blame] | 2609 | drv->state = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | drv->tty_driver = NULL; |
| 2611 | } |
| 2612 | |
| 2613 | struct tty_driver *uart_console_device(struct console *co, int *index) |
| 2614 | { |
| 2615 | struct uart_driver *p = co->data; |
| 2616 | *index = co->index; |
| 2617 | return p->tty_driver; |
| 2618 | } |
John Stultz | 488f49a | 2020-01-07 01:03:10 +0000 | [diff] [blame] | 2619 | EXPORT_SYMBOL_GPL(uart_console_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2621 | static ssize_t uartclk_show(struct device *dev, |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2622 | struct device_attribute *attr, char *buf) |
| 2623 | { |
Alan Cox | bebe73e | 2012-10-29 15:19:57 +0000 | [diff] [blame] | 2624 | struct serial_struct tmp; |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2625 | struct tty_port *port = dev_get_drvdata(dev); |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 2626 | |
Alan Cox | 9f10969 | 2012-10-29 15:20:25 +0000 | [diff] [blame] | 2627 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2628 | return sprintf(buf, "%d\n", tmp.baud_base * 16); |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2629 | } |
| 2630 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2631 | static ssize_t type_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2632 | struct device_attribute *attr, char *buf) |
| 2633 | { |
| 2634 | struct serial_struct tmp; |
| 2635 | struct tty_port *port = dev_get_drvdata(dev); |
| 2636 | |
| 2637 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2638 | return sprintf(buf, "%d\n", tmp.type); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2639 | } |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2640 | |
| 2641 | static ssize_t line_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2642 | struct device_attribute *attr, char *buf) |
| 2643 | { |
| 2644 | struct serial_struct tmp; |
| 2645 | struct tty_port *port = dev_get_drvdata(dev); |
| 2646 | |
| 2647 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2648 | return sprintf(buf, "%d\n", tmp.line); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2649 | } |
| 2650 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2651 | static ssize_t port_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2652 | struct device_attribute *attr, char *buf) |
| 2653 | { |
| 2654 | struct serial_struct tmp; |
| 2655 | struct tty_port *port = dev_get_drvdata(dev); |
Andrew Morton | fd985e1 | 2012-11-26 15:47:15 -0800 | [diff] [blame] | 2656 | unsigned long ioaddr; |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2657 | |
| 2658 | uart_get_info(port, &tmp); |
Andrew Morton | fd985e1 | 2012-11-26 15:47:15 -0800 | [diff] [blame] | 2659 | ioaddr = tmp.port; |
| 2660 | if (HIGH_BITS_OFFSET) |
| 2661 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2662 | return sprintf(buf, "0x%lX\n", ioaddr); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2663 | } |
| 2664 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2665 | static ssize_t irq_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2666 | struct device_attribute *attr, char *buf) |
| 2667 | { |
| 2668 | struct serial_struct tmp; |
| 2669 | struct tty_port *port = dev_get_drvdata(dev); |
| 2670 | |
| 2671 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2672 | return sprintf(buf, "%d\n", tmp.irq); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2673 | } |
| 2674 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2675 | static ssize_t flags_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2676 | struct device_attribute *attr, char *buf) |
| 2677 | { |
| 2678 | struct serial_struct tmp; |
| 2679 | struct tty_port *port = dev_get_drvdata(dev); |
| 2680 | |
| 2681 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2682 | return sprintf(buf, "0x%X\n", tmp.flags); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2683 | } |
| 2684 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2685 | static ssize_t xmit_fifo_size_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2686 | struct device_attribute *attr, char *buf) |
| 2687 | { |
| 2688 | struct serial_struct tmp; |
| 2689 | struct tty_port *port = dev_get_drvdata(dev); |
| 2690 | |
| 2691 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2692 | return sprintf(buf, "%d\n", tmp.xmit_fifo_size); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2693 | } |
| 2694 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2695 | static ssize_t close_delay_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2696 | struct device_attribute *attr, char *buf) |
| 2697 | { |
| 2698 | struct serial_struct tmp; |
| 2699 | struct tty_port *port = dev_get_drvdata(dev); |
| 2700 | |
| 2701 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2702 | return sprintf(buf, "%d\n", tmp.close_delay); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2703 | } |
| 2704 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2705 | static ssize_t closing_wait_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2706 | struct device_attribute *attr, char *buf) |
| 2707 | { |
| 2708 | struct serial_struct tmp; |
| 2709 | struct tty_port *port = dev_get_drvdata(dev); |
| 2710 | |
| 2711 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2712 | return sprintf(buf, "%d\n", tmp.closing_wait); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2713 | } |
| 2714 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2715 | static ssize_t custom_divisor_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2716 | struct device_attribute *attr, char *buf) |
| 2717 | { |
| 2718 | struct serial_struct tmp; |
| 2719 | struct tty_port *port = dev_get_drvdata(dev); |
| 2720 | |
| 2721 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2722 | return sprintf(buf, "%d\n", tmp.custom_divisor); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2723 | } |
| 2724 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2725 | static ssize_t io_type_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2726 | struct device_attribute *attr, char *buf) |
| 2727 | { |
| 2728 | struct serial_struct tmp; |
| 2729 | struct tty_port *port = dev_get_drvdata(dev); |
| 2730 | |
| 2731 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2732 | return sprintf(buf, "%d\n", tmp.io_type); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2733 | } |
| 2734 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2735 | static ssize_t iomem_base_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2736 | struct device_attribute *attr, char *buf) |
| 2737 | { |
| 2738 | struct serial_struct tmp; |
| 2739 | struct tty_port *port = dev_get_drvdata(dev); |
| 2740 | |
| 2741 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2742 | return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2743 | } |
| 2744 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2745 | static ssize_t iomem_reg_shift_show(struct device *dev, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2746 | struct device_attribute *attr, char *buf) |
| 2747 | { |
| 2748 | struct serial_struct tmp; |
| 2749 | struct tty_port *port = dev_get_drvdata(dev); |
| 2750 | |
| 2751 | uart_get_info(port, &tmp); |
Alex Dewar | 9cfbf7a | 2020-08-24 23:39:33 +0100 | [diff] [blame] | 2752 | return sprintf(buf, "%d\n", tmp.iomem_reg_shift); |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2753 | } |
| 2754 | |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2755 | static ssize_t console_show(struct device *dev, |
| 2756 | struct device_attribute *attr, char *buf) |
| 2757 | { |
| 2758 | struct tty_port *port = dev_get_drvdata(dev); |
| 2759 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 2760 | struct uart_port *uport; |
| 2761 | bool console = false; |
| 2762 | |
| 2763 | mutex_lock(&port->mutex); |
| 2764 | uport = uart_port_check(state); |
| 2765 | if (uport) |
| 2766 | console = uart_console_enabled(uport); |
| 2767 | mutex_unlock(&port->mutex); |
| 2768 | |
| 2769 | return sprintf(buf, "%c\n", console ? 'Y' : 'N'); |
| 2770 | } |
| 2771 | |
| 2772 | static ssize_t console_store(struct device *dev, |
| 2773 | struct device_attribute *attr, const char *buf, size_t count) |
| 2774 | { |
| 2775 | struct tty_port *port = dev_get_drvdata(dev); |
| 2776 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 2777 | struct uart_port *uport; |
| 2778 | bool oldconsole, newconsole; |
| 2779 | int ret; |
| 2780 | |
| 2781 | ret = kstrtobool(buf, &newconsole); |
| 2782 | if (ret) |
| 2783 | return ret; |
| 2784 | |
| 2785 | mutex_lock(&port->mutex); |
| 2786 | uport = uart_port_check(state); |
| 2787 | if (uport) { |
| 2788 | oldconsole = uart_console_enabled(uport); |
| 2789 | if (oldconsole && !newconsole) { |
| 2790 | ret = unregister_console(uport->cons); |
| 2791 | } else if (!oldconsole && newconsole) { |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 2792 | if (uart_console(uport)) { |
| 2793 | uport->console_reinit = 1; |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2794 | register_console(uport->cons); |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 2795 | } else { |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2796 | ret = -ENOENT; |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 2797 | } |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2798 | } |
| 2799 | } else { |
| 2800 | ret = -ENXIO; |
| 2801 | } |
| 2802 | mutex_unlock(&port->mutex); |
| 2803 | |
| 2804 | return ret < 0 ? ret : count; |
| 2805 | } |
| 2806 | |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2807 | static DEVICE_ATTR_RO(uartclk); |
| 2808 | static DEVICE_ATTR_RO(type); |
| 2809 | static DEVICE_ATTR_RO(line); |
| 2810 | static DEVICE_ATTR_RO(port); |
| 2811 | static DEVICE_ATTR_RO(irq); |
| 2812 | static DEVICE_ATTR_RO(flags); |
| 2813 | static DEVICE_ATTR_RO(xmit_fifo_size); |
| 2814 | static DEVICE_ATTR_RO(close_delay); |
| 2815 | static DEVICE_ATTR_RO(closing_wait); |
| 2816 | static DEVICE_ATTR_RO(custom_divisor); |
| 2817 | static DEVICE_ATTR_RO(io_type); |
| 2818 | static DEVICE_ATTR_RO(iomem_base); |
| 2819 | static DEVICE_ATTR_RO(iomem_reg_shift); |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2820 | static DEVICE_ATTR_RW(console); |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2821 | |
| 2822 | static struct attribute *tty_dev_attrs[] = { |
Andy Shevchenko | 143c02c | 2020-02-17 13:40:11 +0200 | [diff] [blame] | 2823 | &dev_attr_uartclk.attr, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2824 | &dev_attr_type.attr, |
| 2825 | &dev_attr_line.attr, |
| 2826 | &dev_attr_port.attr, |
| 2827 | &dev_attr_irq.attr, |
| 2828 | &dev_attr_flags.attr, |
| 2829 | &dev_attr_xmit_fifo_size.attr, |
Alan Cox | 373bac4 | 2012-10-29 15:20:40 +0000 | [diff] [blame] | 2830 | &dev_attr_close_delay.attr, |
| 2831 | &dev_attr_closing_wait.attr, |
| 2832 | &dev_attr_custom_divisor.attr, |
| 2833 | &dev_attr_io_type.attr, |
| 2834 | &dev_attr_iomem_base.attr, |
| 2835 | &dev_attr_iomem_reg_shift.attr, |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2836 | &dev_attr_console.attr, |
| 2837 | NULL |
| 2838 | }; |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2839 | |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 2840 | static const struct attribute_group tty_dev_attr_group = { |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2841 | .attrs = tty_dev_attrs, |
Andy Shevchenko | a3cb39d | 2020-02-17 13:40:12 +0200 | [diff] [blame] | 2842 | }; |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2844 | /** |
| 2845 | * uart_add_one_port - attach a driver-defined port structure |
| 2846 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2847 | * @uport: uart port structure to use for this port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | * |
Ahmed S. Darwish | a157270 | 2021-02-08 19:16:15 +0100 | [diff] [blame] | 2849 | * Context: task context, might sleep |
| 2850 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2851 | * This allows the driver to register its own uart_port structure |
| 2852 | * with the core driver. The main purpose is to allow the low |
| 2853 | * level uart drivers to expand uart_port, rather than having yet |
| 2854 | * more levels of structures. |
| 2855 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2856 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | { |
| 2858 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2859 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | int ret = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2861 | struct device *tty_dev; |
Greg Kroah-Hartman | 266dcff | 2014-07-16 01:19:34 +0000 | [diff] [blame] | 2862 | int num_groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2863 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2864 | if (uport->line >= drv->nr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2865 | return -EINVAL; |
| 2866 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2867 | state = drv->state + uport->line; |
| 2868 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2870 | mutex_lock(&port_mutex); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2871 | mutex_lock(&port->mutex); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2872 | if (state->uart_port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | ret = -EINVAL; |
| 2874 | goto out; |
| 2875 | } |
| 2876 | |
Peter Hurley | 2b702b9 | 2014-10-16 16:54:25 -0400 | [diff] [blame] | 2877 | /* Link the port to the driver state table and vice versa */ |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 2878 | atomic_set(&state->refcount, 1); |
| 2879 | init_waitqueue_head(&state->remove_wait); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2880 | state->uart_port = uport; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2881 | uport->state = state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | |
Peter Hurley | 2b702b9 | 2014-10-16 16:54:25 -0400 | [diff] [blame] | 2883 | state->pm_state = UART_PM_STATE_UNDEFINED; |
| 2884 | uport->cons = drv->cons; |
Peter Hurley | 959801f | 2015-02-24 14:25:00 -0500 | [diff] [blame] | 2885 | uport->minor = drv->tty_driver->minor_start + uport->line; |
Vignesh R | f7048b1 | 2017-03-24 10:57:59 +0530 | [diff] [blame] | 2886 | uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, |
| 2887 | drv->tty_driver->name_base + uport->line); |
| 2888 | if (!uport->name) { |
| 2889 | ret = -ENOMEM; |
| 2890 | goto out; |
| 2891 | } |
Peter Hurley | 2b702b9 | 2014-10-16 16:54:25 -0400 | [diff] [blame] | 2892 | |
Johan Hovold | fe88c64 | 2020-09-09 16:31:00 +0200 | [diff] [blame] | 2893 | /* |
| 2894 | * If this port is in use as a console then the spinlock is already |
| 2895 | * initialised. |
| 2896 | */ |
| 2897 | if (!uart_console_enabled(uport)) |
Johan Hovold | e0830dbf | 2020-09-09 16:31:01 +0200 | [diff] [blame] | 2898 | uart_port_spin_lock_init(uport); |
Andy Shevchenko | d2403ca | 2020-02-14 13:43:33 +0200 | [diff] [blame] | 2899 | |
Grant Likely | a208ffd | 2014-03-27 18:29:46 -0700 | [diff] [blame] | 2900 | if (uport->cons && uport->dev) |
Michal Simek | dd8b7a1 | 2019-10-16 12:36:41 +0200 | [diff] [blame] | 2901 | of_console_check(uport->dev->of_node, uport->cons->name, uport->line); |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2902 | |
Sudip Mukherjee | fb2b900 | 2019-12-12 13:16:02 +0000 | [diff] [blame] | 2903 | tty_port_link_device(port, drv->tty_driver, uport->line); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2904 | uart_configure_port(drv, state, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | |
Geert Uytterhoeven | 4dda864 | 2016-10-28 07:07:47 -0500 | [diff] [blame] | 2906 | port->console = uart_console(uport); |
| 2907 | |
Greg Kroah-Hartman | 266dcff | 2014-07-16 01:19:34 +0000 | [diff] [blame] | 2908 | num_groups = 2; |
| 2909 | if (uport->attr_group) |
| 2910 | num_groups++; |
| 2911 | |
Yoshihiro YUNOMAE | c2b703b | 2014-07-23 06:06:22 +0000 | [diff] [blame] | 2912 | uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), |
Greg Kroah-Hartman | 266dcff | 2014-07-16 01:19:34 +0000 | [diff] [blame] | 2913 | GFP_KERNEL); |
| 2914 | if (!uport->tty_groups) { |
| 2915 | ret = -ENOMEM; |
| 2916 | goto out; |
| 2917 | } |
| 2918 | uport->tty_groups[0] = &tty_dev_attr_group; |
| 2919 | if (uport->attr_group) |
| 2920 | uport->tty_groups[1] = uport->attr_group; |
| 2921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2922 | /* |
| 2923 | * Register the port whether it's detected or not. This allows |
Geert Uytterhoeven | 015355b | 2014-03-11 11:23:36 +0100 | [diff] [blame] | 2924 | * setserial to be used to alter this port's parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | */ |
Johan Hovold | da4c279 | 2017-05-18 17:33:01 +0200 | [diff] [blame] | 2926 | tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, |
Greg Kroah-Hartman | 266dcff | 2014-07-16 01:19:34 +0000 | [diff] [blame] | 2927 | uport->line, uport->dev, port, uport->tty_groups); |
Chengguang Xu | b289c49 | 2019-02-18 16:31:04 +0800 | [diff] [blame] | 2928 | if (!IS_ERR(tty_dev)) { |
Simon Glass | 7735983 | 2012-01-19 11:28:56 -0800 | [diff] [blame] | 2929 | device_set_wakeup_capable(tty_dev, 1); |
| 2930 | } else { |
Sudip Mukherjee | 2f2dafe | 2014-09-01 20:49:43 +0530 | [diff] [blame] | 2931 | dev_err(uport->dev, "Cannot register tty device on line %d\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2932 | uport->line); |
Simon Glass | 7735983 | 2012-01-19 11:28:56 -0800 | [diff] [blame] | 2933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | |
| 2935 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2936 | * Ensure UPF_DEAD is not set. |
| 2937 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2938 | uport->flags &= ~UPF_DEAD; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2940 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2941 | mutex_unlock(&port->mutex); |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2942 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2943 | |
| 2944 | return ret; |
| 2945 | } |
| 2946 | |
| 2947 | /** |
| 2948 | * uart_remove_one_port - detach a driver defined port structure |
| 2949 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2950 | * @uport: uart port structure for this port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2951 | * |
Ahmed S. Darwish | a157270 | 2021-02-08 19:16:15 +0100 | [diff] [blame] | 2952 | * Context: task context, might sleep |
| 2953 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | * This unhooks (and hangs up) the specified port structure from the |
| 2955 | * core driver. No further calls will be made to the low-level code |
| 2956 | * for this port. |
| 2957 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2958 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2959 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2960 | struct uart_state *state = drv->state + uport->line; |
| 2961 | struct tty_port *port = &state->port; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 2962 | struct uart_port *uart_port; |
Geert Uytterhoeven | 4c6d5b4 | 2014-03-17 14:10:58 +0100 | [diff] [blame] | 2963 | struct tty_struct *tty; |
Chen Gang | b342dd5 | 2012-12-27 15:51:31 +0800 | [diff] [blame] | 2964 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2966 | mutex_lock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | |
| 2968 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2969 | * Mark the port "dead" - this prevents any opens from |
| 2970 | * succeeding while we shut down the port. |
| 2971 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2972 | mutex_lock(&port->mutex); |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 2973 | uart_port = uart_port_check(state); |
| 2974 | if (uart_port != uport) |
| 2975 | dev_alert(uport->dev, "Removing wrong port: %p != %p\n", |
| 2976 | uart_port, uport); |
| 2977 | |
| 2978 | if (!uart_port) { |
Chen Gang | b342dd5 | 2012-12-27 15:51:31 +0800 | [diff] [blame] | 2979 | mutex_unlock(&port->mutex); |
| 2980 | ret = -EINVAL; |
| 2981 | goto out; |
| 2982 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2983 | uport->flags |= UPF_DEAD; |
| 2984 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2985 | |
| 2986 | /* |
Greg Kroah-Hartman | aa4148c | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2987 | * Remove the devices from the tty layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | */ |
Johan Hovold | da4c279 | 2017-05-18 17:33:01 +0200 | [diff] [blame] | 2989 | tty_port_unregister_device(port, drv->tty_driver, uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2990 | |
Geert Uytterhoeven | 4c6d5b4 | 2014-03-17 14:10:58 +0100 | [diff] [blame] | 2991 | tty = tty_port_tty_get(port); |
| 2992 | if (tty) { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2993 | tty_vhangup(port->tty); |
Geert Uytterhoeven | 4c6d5b4 | 2014-03-17 14:10:58 +0100 | [diff] [blame] | 2994 | tty_kref_put(tty); |
| 2995 | } |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2996 | |
| 2997 | /* |
Geert Uytterhoeven | 5f5c9ae | 2014-02-28 14:21:32 +0100 | [diff] [blame] | 2998 | * If the port is used as a console, unregister it |
| 2999 | */ |
| 3000 | if (uart_console(uport)) |
| 3001 | unregister_console(uport->cons); |
| 3002 | |
| 3003 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 3004 | * Free the port IO and memory resources, if any. |
| 3005 | */ |
Fabio Estevam | a7cfaf1 | 2016-05-20 01:59:54 -0300 | [diff] [blame] | 3006 | if (uport->type != PORT_UNKNOWN && uport->ops->release_port) |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 3007 | uport->ops->release_port(uport); |
Greg Kroah-Hartman | 266dcff | 2014-07-16 01:19:34 +0000 | [diff] [blame] | 3008 | kfree(uport->tty_groups); |
Vignesh R | f7048b1 | 2017-03-24 10:57:59 +0530 | [diff] [blame] | 3009 | kfree(uport->name); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 3010 | |
| 3011 | /* |
| 3012 | * Indicate that there isn't a port here anymore. |
| 3013 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 3014 | uport->type = PORT_UNKNOWN; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 3015 | |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 3016 | mutex_lock(&port->mutex); |
Peter Hurley | 9ed1942 | 2016-04-09 18:56:34 -0700 | [diff] [blame] | 3017 | WARN_ON(atomic_dec_return(&state->refcount) < 0); |
| 3018 | wait_event(state->remove_wait, !atomic_read(&state->refcount)); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 3019 | state->uart_port = NULL; |
Peter Hurley | 4047b37 | 2016-04-09 18:56:33 -0700 | [diff] [blame] | 3020 | mutex_unlock(&port->mutex); |
Chen Gang | b342dd5 | 2012-12-27 15:51:31 +0800 | [diff] [blame] | 3021 | out: |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3022 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3023 | |
Chen Gang | b342dd5 | 2012-12-27 15:51:31 +0800 | [diff] [blame] | 3024 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | } |
| 3026 | |
| 3027 | /* |
| 3028 | * Are the two ports equivalent? |
| 3029 | */ |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3030 | bool uart_match_port(const struct uart_port *port1, |
| 3031 | const struct uart_port *port2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | { |
| 3033 | if (port1->iotype != port2->iotype) |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3034 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | |
| 3036 | switch (port1->iotype) { |
| 3037 | case UPIO_PORT: |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3038 | return port1->iobase == port2->iobase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | case UPIO_HUB6: |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3040 | return port1->iobase == port2->iobase && |
| 3041 | port1->hub6 == port2->hub6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3042 | case UPIO_MEM: |
Masahiro Yamada | bd94c40 | 2015-10-28 12:46:05 +0900 | [diff] [blame] | 3043 | case UPIO_MEM16: |
Sergei Shtylyov | d21b55d | 2006-08-28 19:49:03 +0400 | [diff] [blame] | 3044 | case UPIO_MEM32: |
Kevin Cernekee | 3ffb1a8 | 2014-11-12 12:53:59 -0800 | [diff] [blame] | 3045 | case UPIO_MEM32BE: |
Sergei Shtylyov | d21b55d | 2006-08-28 19:49:03 +0400 | [diff] [blame] | 3046 | case UPIO_AU: |
| 3047 | case UPIO_TSI: |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3048 | return port1->mapbase == port2->mapbase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | } |
Jiri Slaby | b8be5db | 2021-05-19 09:21:50 +0200 | [diff] [blame] | 3050 | |
| 3051 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | } |
| 3053 | EXPORT_SYMBOL(uart_match_port); |
| 3054 | |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3055 | /** |
| 3056 | * uart_handle_dcd_change - handle a change of carrier detect state |
| 3057 | * @uport: uart_port structure for the open port |
| 3058 | * @status: new carrier detect status, nonzero if active |
Peter Hurley | 4d90bb1 | 2014-09-10 15:06:23 -0400 | [diff] [blame] | 3059 | * |
| 3060 | * Caller must hold uport->lock |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3061 | */ |
| 3062 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) |
| 3063 | { |
George Spelvin | 4238157 | 2013-02-10 04:44:30 -0500 | [diff] [blame] | 3064 | struct tty_port *port = &uport->state->port; |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 3065 | struct tty_struct *tty = port->tty; |
Peter Hurley | c993257 | 2014-09-02 17:39:21 -0400 | [diff] [blame] | 3066 | struct tty_ldisc *ld; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3067 | |
Peter Hurley | 4d90bb1 | 2014-09-10 15:06:23 -0400 | [diff] [blame] | 3068 | lockdep_assert_held_once(&uport->lock); |
| 3069 | |
Peter Hurley | c993257 | 2014-09-02 17:39:21 -0400 | [diff] [blame] | 3070 | if (tty) { |
| 3071 | ld = tty_ldisc_ref(tty); |
| 3072 | if (ld) { |
| 3073 | if (ld->ops->dcd_change) |
| 3074 | ld->ops->dcd_change(tty, status); |
| 3075 | tty_ldisc_deref(ld); |
| 3076 | } |
George Spelvin | 4238157 | 2013-02-10 04:44:30 -0500 | [diff] [blame] | 3077 | } |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3078 | |
| 3079 | uport->icount.dcd++; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3080 | |
Peter Hurley | 299245a | 2014-09-10 15:06:24 -0400 | [diff] [blame] | 3081 | if (uart_dcd_enabled(uport)) { |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3082 | if (status) |
| 3083 | wake_up_interruptible(&port->open_wait); |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 3084 | else if (tty) |
| 3085 | tty_hangup(tty); |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3086 | } |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3087 | } |
| 3088 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); |
| 3089 | |
| 3090 | /** |
| 3091 | * uart_handle_cts_change - handle a change of clear-to-send state |
| 3092 | * @uport: uart_port structure for the open port |
| 3093 | * @status: new clear to send status, nonzero if active |
Peter Hurley | 4d90bb1 | 2014-09-10 15:06:23 -0400 | [diff] [blame] | 3094 | * |
| 3095 | * Caller must hold uport->lock |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3096 | */ |
| 3097 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) |
| 3098 | { |
Peter Hurley | 4d90bb1 | 2014-09-10 15:06:23 -0400 | [diff] [blame] | 3099 | lockdep_assert_held_once(&uport->lock); |
| 3100 | |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3101 | uport->icount.cts++; |
| 3102 | |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 3103 | if (uart_softcts_mode(uport)) { |
Peter Hurley | d01f4d1 | 2014-09-10 15:06:26 -0400 | [diff] [blame] | 3104 | if (uport->hw_stopped) { |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3105 | if (status) { |
Peter Hurley | d01f4d1 | 2014-09-10 15:06:26 -0400 | [diff] [blame] | 3106 | uport->hw_stopped = 0; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3107 | uport->ops->start_tx(uport); |
| 3108 | uart_write_wakeup(uport); |
| 3109 | } |
| 3110 | } else { |
| 3111 | if (!status) { |
Peter Hurley | d01f4d1 | 2014-09-10 15:06:26 -0400 | [diff] [blame] | 3112 | uport->hw_stopped = 1; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3113 | uport->ops->stop_tx(uport); |
| 3114 | } |
| 3115 | } |
Peter Hurley | 391f93f | 2015-01-25 14:44:51 -0500 | [diff] [blame] | 3116 | |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3117 | } |
| 3118 | } |
| 3119 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); |
| 3120 | |
Jiri Slaby | cf75525 | 2011-11-09 21:33:47 +0100 | [diff] [blame] | 3121 | /** |
| 3122 | * uart_insert_char - push a char to the uart layer |
| 3123 | * |
| 3124 | * User is responsible to call tty_flip_buffer_push when they are done with |
| 3125 | * insertion. |
| 3126 | * |
| 3127 | * @port: corresponding port |
| 3128 | * @status: state of the serial port RX buffer (LSR for 8250) |
| 3129 | * @overrun: mask of overrun bits in @status |
| 3130 | * @ch: character to push |
| 3131 | * @flag: flag for the character (see TTY_NORMAL and friends) |
| 3132 | */ |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3133 | void uart_insert_char(struct uart_port *port, unsigned int status, |
| 3134 | unsigned int overrun, unsigned int ch, unsigned int flag) |
| 3135 | { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 3136 | struct tty_port *tport = &port->state->port; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3137 | |
| 3138 | if ((status & port->ignore_status_mask & ~overrun) == 0) |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 3139 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
Corbin | dabfb35 | 2012-05-23 09:37:31 -0500 | [diff] [blame] | 3140 | ++port->icount.buf_overrun; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3141 | |
| 3142 | /* |
| 3143 | * Overrun is special. Since it's reported immediately, |
| 3144 | * it doesn't affect the current character. |
| 3145 | */ |
| 3146 | if (status & ~port->ignore_status_mask & overrun) |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 3147 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
Corbin | dabfb35 | 2012-05-23 09:37:31 -0500 | [diff] [blame] | 3148 | ++port->icount.buf_overrun; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 3149 | } |
| 3150 | EXPORT_SYMBOL_GPL(uart_insert_char); |
| 3151 | |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3152 | #ifdef CONFIG_MAGIC_SYSRQ_SERIAL |
| 3153 | static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; |
| 3154 | |
| 3155 | static void uart_sysrq_on(struct work_struct *w) |
| 3156 | { |
Andy Shevchenko | b18896f | 2020-03-10 19:43:35 +0200 | [diff] [blame] | 3157 | int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); |
| 3158 | |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3159 | sysrq_toggle_support(1); |
Andy Shevchenko | b18896f | 2020-03-10 19:43:35 +0200 | [diff] [blame] | 3160 | pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", |
| 3161 | sysrq_toggle_seq_len, sysrq_toggle_seq); |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3162 | } |
| 3163 | static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); |
| 3164 | |
| 3165 | /** |
| 3166 | * uart_try_toggle_sysrq - Enables SysRq from serial line |
| 3167 | * @port: uart_port structure where char(s) after BREAK met |
| 3168 | * @ch: new character in the sequence after received BREAK |
| 3169 | * |
| 3170 | * Enables magic SysRq when the required sequence is met on port |
| 3171 | * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). |
| 3172 | * |
| 3173 | * Returns false if @ch is out of enabling sequence and should be |
| 3174 | * handled some other way, true if @ch was consumed. |
| 3175 | */ |
Johan Hovold | 08d5470 | 2020-06-10 17:22:31 +0200 | [diff] [blame] | 3176 | bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3177 | { |
Andy Shevchenko | 2ce5eac | 2020-03-10 19:43:34 +0200 | [diff] [blame] | 3178 | int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); |
| 3179 | |
| 3180 | if (!sysrq_toggle_seq_len) |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3181 | return false; |
| 3182 | |
| 3183 | BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); |
| 3184 | if (sysrq_toggle_seq[port->sysrq_seq] != ch) { |
| 3185 | port->sysrq_seq = 0; |
| 3186 | return false; |
| 3187 | } |
| 3188 | |
Andy Shevchenko | 2ce5eac | 2020-03-10 19:43:34 +0200 | [diff] [blame] | 3189 | if (++port->sysrq_seq < sysrq_toggle_seq_len) { |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3190 | port->sysrq = jiffies + SYSRQ_TIMEOUT; |
| 3191 | return true; |
| 3192 | } |
| 3193 | |
| 3194 | schedule_work(&sysrq_enable_work); |
| 3195 | |
| 3196 | port->sysrq = 0; |
| 3197 | return true; |
| 3198 | } |
Johan Hovold | 08d5470 | 2020-06-10 17:22:31 +0200 | [diff] [blame] | 3199 | EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); |
Dmitry Safonov | 68af431 | 2020-03-02 17:51:35 +0000 | [diff] [blame] | 3200 | #endif |
| 3201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3202 | EXPORT_SYMBOL(uart_write_wakeup); |
| 3203 | EXPORT_SYMBOL(uart_register_driver); |
| 3204 | EXPORT_SYMBOL(uart_unregister_driver); |
| 3205 | EXPORT_SYMBOL(uart_suspend_port); |
| 3206 | EXPORT_SYMBOL(uart_resume_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3207 | EXPORT_SYMBOL(uart_add_one_port); |
| 3208 | EXPORT_SYMBOL(uart_remove_one_port); |
| 3209 | |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3210 | /** |
Lukas Wunner | 743f93f | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3211 | * uart_get_rs485_mode() - retrieve rs485 properties for given uart |
Randy Dunlap | a717256 | 2020-06-15 12:24:36 -0700 | [diff] [blame] | 3212 | * @port: uart device's target port |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3213 | * |
| 3214 | * This function implements the device tree binding described in |
| 3215 | * Documentation/devicetree/bindings/serial/rs485.txt. |
| 3216 | */ |
Lukas Wunner | c150c0f | 2020-05-12 14:40:02 +0200 | [diff] [blame] | 3217 | int uart_get_rs485_mode(struct uart_port *port) |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3218 | { |
Lukas Wunner | c150c0f | 2020-05-12 14:40:02 +0200 | [diff] [blame] | 3219 | struct serial_rs485 *rs485conf = &port->rs485; |
| 3220 | struct device *dev = port->dev; |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3221 | u32 rs485_delay[2]; |
| 3222 | int ret; |
| 3223 | |
Lukas Wunner | 743f93f | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3224 | ret = device_property_read_u32_array(dev, "rs485-rts-delay", |
| 3225 | rs485_delay, 2); |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3226 | if (!ret) { |
| 3227 | rs485conf->delay_rts_before_send = rs485_delay[0]; |
| 3228 | rs485conf->delay_rts_after_send = rs485_delay[1]; |
| 3229 | } else { |
| 3230 | rs485conf->delay_rts_before_send = 0; |
| 3231 | rs485conf->delay_rts_after_send = 0; |
| 3232 | } |
| 3233 | |
| 3234 | /* |
Lukas Wunner | f1e5b61 | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3235 | * Clear full-duplex and enabled flags, set RTS polarity to active high |
| 3236 | * to get to a defined state with the following properties: |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3237 | */ |
Lukas Wunner | f1e5b61 | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3238 | rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | |
Lukas Wunner | d58a2df | 2020-05-18 16:45:02 +0200 | [diff] [blame] | 3239 | SER_RS485_TERMINATE_BUS | |
Lukas Wunner | f1e5b61 | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3240 | SER_RS485_RTS_AFTER_SEND); |
| 3241 | rs485conf->flags |= SER_RS485_RTS_ON_SEND; |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3242 | |
Lukas Wunner | 743f93f | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3243 | if (device_property_read_bool(dev, "rs485-rx-during-tx")) |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3244 | rs485conf->flags |= SER_RS485_RX_DURING_TX; |
| 3245 | |
Lukas Wunner | 743f93f | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3246 | if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3247 | rs485conf->flags |= SER_RS485_ENABLED; |
Lukas Wunner | f1e5b61 | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3248 | |
| 3249 | if (device_property_read_bool(dev, "rs485-rts-active-low")) { |
| 3250 | rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; |
| 3251 | rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; |
| 3252 | } |
Lukas Wunner | c150c0f | 2020-05-12 14:40:02 +0200 | [diff] [blame] | 3253 | |
Lukas Wunner | d58a2df | 2020-05-18 16:45:02 +0200 | [diff] [blame] | 3254 | /* |
| 3255 | * Disabling termination by default is the safe choice: Else if many |
| 3256 | * bus participants enable it, no communication is possible at all. |
| 3257 | * Works fine for short cables and users may enable for longer cables. |
| 3258 | */ |
| 3259 | port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", |
| 3260 | GPIOD_OUT_LOW); |
| 3261 | if (IS_ERR(port->rs485_term_gpio)) { |
| 3262 | ret = PTR_ERR(port->rs485_term_gpio); |
| 3263 | port->rs485_term_gpio = NULL; |
Krzysztof Kozlowski | 89c65d6 | 2020-09-01 17:31:00 +0200 | [diff] [blame] | 3264 | return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); |
Lukas Wunner | d58a2df | 2020-05-18 16:45:02 +0200 | [diff] [blame] | 3265 | } |
| 3266 | |
Lukas Wunner | c150c0f | 2020-05-12 14:40:02 +0200 | [diff] [blame] | 3267 | return 0; |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3268 | } |
Lukas Wunner | 743f93f | 2017-11-24 23:26:40 +0100 | [diff] [blame] | 3269 | EXPORT_SYMBOL_GPL(uart_get_rs485_mode); |
Uwe Kleine-König | ef838a8 | 2017-09-13 10:18:27 +0200 | [diff] [blame] | 3270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3271 | MODULE_DESCRIPTION("Serial driver core"); |
| 3272 | MODULE_LICENSE("GPL"); |