Greg Kroah-Hartman | e3b3d0f | 2017-11-06 18:11:51 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 2 | /* sunhv.c: Serial driver for SUN4V hypervisor console. |
| 3 | * |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 4 | * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 5 | */ |
| 6 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 7 | #include <linux/kernel.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/tty.h> |
| 10 | #include <linux/tty_flip.h> |
| 11 | #include <linux/major.h> |
| 12 | #include <linux/circ_buf.h> |
| 13 | #include <linux/serial.h> |
| 14 | #include <linux/sysrq.h> |
| 15 | #include <linux/console.h> |
| 16 | #include <linux/spinlock.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/init.h> |
Rob Herring | 29e5c44 | 2023-07-24 14:54:38 -0600 | [diff] [blame] | 20 | #include <linux/of.h> |
| 21 | #include <linux/platform_device.h> |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 22 | |
| 23 | #include <asm/hypervisor.h> |
| 24 | #include <asm/spitfire.h> |
David S. Miller | f4266ab | 2006-02-13 20:43:02 -0800 | [diff] [blame] | 25 | #include <asm/irq.h> |
David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 26 | #include <asm/setup.h> |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 27 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 28 | #include <linux/serial_core.h> |
Paul Gortmaker | 6816383 | 2012-02-09 18:48:19 -0500 | [diff] [blame] | 29 | #include <linux/sunserialcore.h> |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 30 | |
| 31 | #define CON_BREAK ((long)-1) |
| 32 | #define CON_HUP ((long)-2) |
| 33 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 34 | #define IGNORE_BREAK 0x1 |
| 35 | #define IGNORE_ALL 0x2 |
| 36 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 37 | static char *con_write_page; |
| 38 | static char *con_read_page; |
| 39 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 40 | static int hung_up = 0; |
| 41 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 42 | static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 43 | { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 44 | while (!uart_circ_empty(xmit)) { |
| 45 | long status = sun4v_con_putchar(xmit->buf[xmit->tail]); |
| 46 | |
| 47 | if (status != HV_EOK) |
| 48 | break; |
| 49 | |
Ilpo Järvinen | c5fd4b7 | 2022-10-19 12:11:42 +0300 | [diff] [blame] | 50 | uart_xmit_advance(port, 1); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 51 | } |
| 52 | } |
| 53 | |
| 54 | static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit) |
| 55 | { |
| 56 | while (!uart_circ_empty(xmit)) { |
| 57 | unsigned long ra = __pa(xmit->buf + xmit->tail); |
| 58 | unsigned long len, status, sent; |
| 59 | |
| 60 | len = CIRC_CNT_TO_END(xmit->head, xmit->tail, |
| 61 | UART_XMIT_SIZE); |
| 62 | status = sun4v_con_write(ra, len, &sent); |
| 63 | if (status != HV_EOK) |
| 64 | break; |
Ilpo Järvinen | c5fd4b7 | 2022-10-19 12:11:42 +0300 | [diff] [blame] | 65 | uart_xmit_advance(port, sent); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 66 | } |
| 67 | } |
| 68 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 69 | static int receive_chars_getchar(struct uart_port *port) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 70 | { |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 71 | int saw_console_brk = 0; |
| 72 | int limit = 10000; |
| 73 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 74 | while (limit-- > 0) { |
| 75 | long status; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 76 | long c = sun4v_con_getchar(&status); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 77 | |
| 78 | if (status == HV_EWOULDBLOCK) |
| 79 | break; |
| 80 | |
| 81 | if (c == CON_BREAK) { |
David S. Miller | 135066a | 2006-02-16 00:42:21 -0800 | [diff] [blame] | 82 | if (uart_handle_break(port)) |
| 83 | continue; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 84 | saw_console_brk = 1; |
| 85 | c = 0; |
| 86 | } |
| 87 | |
| 88 | if (c == CON_HUP) { |
| 89 | hung_up = 1; |
Ilpo Järvinen | 0388a15 | 2023-01-17 11:03:54 +0200 | [diff] [blame] | 90 | uart_handle_dcd_change(port, false); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 91 | } else if (hung_up) { |
| 92 | hung_up = 0; |
Ilpo Järvinen | 0388a15 | 2023-01-17 11:03:54 +0200 | [diff] [blame] | 93 | uart_handle_dcd_change(port, true); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 94 | } |
| 95 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 96 | if (port->state == NULL) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 97 | uart_handle_sysrq_char(port, c); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 98 | continue; |
| 99 | } |
| 100 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 101 | port->icount.rx++; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 102 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 103 | if (uart_handle_sysrq_char(port, c)) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 104 | continue; |
| 105 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 106 | tty_insert_flip_char(&port->state->port, c, TTY_NORMAL); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 107 | } |
| 108 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 109 | return saw_console_brk; |
| 110 | } |
| 111 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 112 | static int receive_chars_read(struct uart_port *port) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 113 | { |
Vijay Kumar | 7db60d0 | 2017-02-01 11:34:39 -0800 | [diff] [blame] | 114 | static int saw_console_brk; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 115 | int limit = 10000; |
| 116 | |
| 117 | while (limit-- > 0) { |
| 118 | unsigned long ra = __pa(con_read_page); |
| 119 | unsigned long bytes_read, i; |
| 120 | long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read); |
| 121 | |
| 122 | if (stat != HV_EOK) { |
| 123 | bytes_read = 0; |
| 124 | |
| 125 | if (stat == CON_BREAK) { |
Vijay Kumar | 7db60d0 | 2017-02-01 11:34:39 -0800 | [diff] [blame] | 126 | if (saw_console_brk) |
| 127 | sun_do_break(); |
| 128 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 129 | if (uart_handle_break(port)) |
| 130 | continue; |
| 131 | saw_console_brk = 1; |
| 132 | *con_read_page = 0; |
| 133 | bytes_read = 1; |
| 134 | } else if (stat == CON_HUP) { |
| 135 | hung_up = 1; |
Ilpo Järvinen | 0388a15 | 2023-01-17 11:03:54 +0200 | [diff] [blame] | 136 | uart_handle_dcd_change(port, false); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 137 | continue; |
| 138 | } else { |
| 139 | /* HV_EWOULDBLOCK, etc. */ |
| 140 | break; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | if (hung_up) { |
| 145 | hung_up = 0; |
Ilpo Järvinen | 0388a15 | 2023-01-17 11:03:54 +0200 | [diff] [blame] | 146 | uart_handle_dcd_change(port, true); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Vijay Kumar | 079317a | 2015-12-23 10:55:33 -0800 | [diff] [blame] | 149 | if (port->sysrq != 0 && *con_read_page) { |
| 150 | for (i = 0; i < bytes_read; i++) |
| 151 | uart_handle_sysrq_char(port, con_read_page[i]); |
Vijay Kumar | 7db60d0 | 2017-02-01 11:34:39 -0800 | [diff] [blame] | 152 | saw_console_brk = 0; |
Vijay Kumar | 079317a | 2015-12-23 10:55:33 -0800 | [diff] [blame] | 153 | } |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 154 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 155 | if (port->state == NULL) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 156 | continue; |
| 157 | |
| 158 | port->icount.rx += bytes_read; |
| 159 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 160 | tty_insert_flip_string(&port->state->port, con_read_page, |
| 161 | bytes_read); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | return saw_console_brk; |
| 165 | } |
| 166 | |
| 167 | struct sunhv_ops { |
| 168 | void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit); |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 169 | int (*receive_chars)(struct uart_port *port); |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 170 | }; |
| 171 | |
Aya Mahfouz | 01fd3c2 | 2015-12-15 01:37:57 +0200 | [diff] [blame] | 172 | static const struct sunhv_ops bychar_ops = { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 173 | .transmit_chars = transmit_chars_putchar, |
| 174 | .receive_chars = receive_chars_getchar, |
| 175 | }; |
| 176 | |
Aya Mahfouz | 01fd3c2 | 2015-12-15 01:37:57 +0200 | [diff] [blame] | 177 | static const struct sunhv_ops bywrite_ops = { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 178 | .transmit_chars = transmit_chars_write, |
| 179 | .receive_chars = receive_chars_read, |
| 180 | }; |
| 181 | |
Aya Mahfouz | 01fd3c2 | 2015-12-15 01:37:57 +0200 | [diff] [blame] | 182 | static const struct sunhv_ops *sunhv_ops = &bychar_ops; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 183 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 184 | static struct tty_port *receive_chars(struct uart_port *port) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 185 | { |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 186 | struct tty_port *tport = NULL; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 187 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 188 | if (port->state != NULL) /* Unopened serial console */ |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 189 | tport = &port->state->port; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 190 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 191 | if (sunhv_ops->receive_chars(port)) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 192 | sun_do_break(); |
| 193 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 194 | return tport; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | static void transmit_chars(struct uart_port *port) |
| 198 | { |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 199 | struct circ_buf *xmit; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 200 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 201 | if (!port->state) |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 202 | return; |
| 203 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 204 | xmit = &port->state->xmit; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 205 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) |
| 206 | return; |
| 207 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 208 | sunhv_ops->transmit_chars(port, xmit); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 209 | |
| 210 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 211 | uart_write_wakeup(port); |
| 212 | } |
| 213 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 214 | static irqreturn_t sunhv_interrupt(int irq, void *dev_id) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 215 | { |
| 216 | struct uart_port *port = dev_id; |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 217 | struct tty_port *tport; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 218 | unsigned long flags; |
| 219 | |
| 220 | spin_lock_irqsave(&port->lock, flags); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 221 | tport = receive_chars(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 222 | transmit_chars(port); |
| 223 | spin_unlock_irqrestore(&port->lock, flags); |
| 224 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 225 | if (tport) |
| 226 | tty_flip_buffer_push(tport); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 227 | |
| 228 | return IRQ_HANDLED; |
| 229 | } |
| 230 | |
| 231 | /* port->lock is not held. */ |
| 232 | static unsigned int sunhv_tx_empty(struct uart_port *port) |
| 233 | { |
| 234 | /* Transmitter is always empty for us. If the circ buffer |
| 235 | * is non-empty or there is an x_char pending, our caller |
| 236 | * will do the right thing and ignore what we return here. |
| 237 | */ |
| 238 | return TIOCSER_TEMT; |
| 239 | } |
| 240 | |
| 241 | /* port->lock held by caller. */ |
| 242 | static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 243 | { |
| 244 | return; |
| 245 | } |
| 246 | |
| 247 | /* port->lock is held by caller and interrupts are disabled. */ |
| 248 | static unsigned int sunhv_get_mctrl(struct uart_port *port) |
| 249 | { |
| 250 | return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS; |
| 251 | } |
| 252 | |
| 253 | /* port->lock held by caller. */ |
| 254 | static void sunhv_stop_tx(struct uart_port *port) |
| 255 | { |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | /* port->lock held by caller. */ |
| 260 | static void sunhv_start_tx(struct uart_port *port) |
| 261 | { |
David S. Miller | f798634 | 2007-07-16 17:05:11 -0700 | [diff] [blame] | 262 | transmit_chars(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /* port->lock is not held. */ |
| 266 | static void sunhv_send_xchar(struct uart_port *port, char ch) |
| 267 | { |
| 268 | unsigned long flags; |
| 269 | int limit = 10000; |
| 270 | |
Peter Hurley | db106df | 2014-09-02 17:39:15 -0400 | [diff] [blame] | 271 | if (ch == __DISABLED_CHAR) |
| 272 | return; |
| 273 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 274 | spin_lock_irqsave(&port->lock, flags); |
| 275 | |
| 276 | while (limit-- > 0) { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 277 | long status = sun4v_con_putchar(ch); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 278 | if (status == HV_EOK) |
| 279 | break; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 280 | udelay(1); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | spin_unlock_irqrestore(&port->lock, flags); |
| 284 | } |
| 285 | |
| 286 | /* port->lock held by caller. */ |
| 287 | static void sunhv_stop_rx(struct uart_port *port) |
| 288 | { |
| 289 | } |
| 290 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 291 | /* port->lock is not held. */ |
| 292 | static void sunhv_break_ctl(struct uart_port *port, int break_state) |
| 293 | { |
| 294 | if (break_state) { |
| 295 | unsigned long flags; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 296 | int limit = 10000; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 297 | |
| 298 | spin_lock_irqsave(&port->lock, flags); |
| 299 | |
| 300 | while (limit-- > 0) { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 301 | long status = sun4v_con_putchar(CON_BREAK); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 302 | if (status == HV_EOK) |
| 303 | break; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 304 | udelay(1); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | spin_unlock_irqrestore(&port->lock, flags); |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | /* port->lock is not held. */ |
| 312 | static int sunhv_startup(struct uart_port *port) |
| 313 | { |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /* port->lock is not held. */ |
| 318 | static void sunhv_shutdown(struct uart_port *port) |
| 319 | { |
| 320 | } |
| 321 | |
| 322 | /* port->lock is not held. */ |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 323 | static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios, |
Ilpo Järvinen | bec5b81 | 2022-08-16 14:57:37 +0300 | [diff] [blame] | 324 | const struct ktermios *old) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 325 | { |
| 326 | unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000); |
| 327 | unsigned int quot = uart_get_divisor(port, baud); |
| 328 | unsigned int iflag, cflag; |
| 329 | unsigned long flags; |
| 330 | |
| 331 | spin_lock_irqsave(&port->lock, flags); |
| 332 | |
| 333 | iflag = termios->c_iflag; |
| 334 | cflag = termios->c_cflag; |
| 335 | |
| 336 | port->ignore_status_mask = 0; |
| 337 | if (iflag & IGNBRK) |
| 338 | port->ignore_status_mask |= IGNORE_BREAK; |
| 339 | if ((cflag & CREAD) == 0) |
| 340 | port->ignore_status_mask |= IGNORE_ALL; |
| 341 | |
| 342 | /* XXX */ |
| 343 | uart_update_timeout(port, cflag, |
| 344 | (port->uartclk / (16 * quot))); |
| 345 | |
| 346 | spin_unlock_irqrestore(&port->lock, flags); |
| 347 | } |
| 348 | |
| 349 | static const char *sunhv_type(struct uart_port *port) |
| 350 | { |
| 351 | return "SUN4V HCONS"; |
| 352 | } |
| 353 | |
| 354 | static void sunhv_release_port(struct uart_port *port) |
| 355 | { |
| 356 | } |
| 357 | |
| 358 | static int sunhv_request_port(struct uart_port *port) |
| 359 | { |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | static void sunhv_config_port(struct uart_port *port, int flags) |
| 364 | { |
| 365 | } |
| 366 | |
| 367 | static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 368 | { |
| 369 | return -EINVAL; |
| 370 | } |
| 371 | |
Bhumika Goyal | 2331e06 | 2017-01-25 23:18:52 +0530 | [diff] [blame] | 372 | static const struct uart_ops sunhv_pops = { |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 373 | .tx_empty = sunhv_tx_empty, |
| 374 | .set_mctrl = sunhv_set_mctrl, |
| 375 | .get_mctrl = sunhv_get_mctrl, |
| 376 | .stop_tx = sunhv_stop_tx, |
| 377 | .start_tx = sunhv_start_tx, |
| 378 | .send_xchar = sunhv_send_xchar, |
| 379 | .stop_rx = sunhv_stop_rx, |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 380 | .break_ctl = sunhv_break_ctl, |
| 381 | .startup = sunhv_startup, |
| 382 | .shutdown = sunhv_shutdown, |
| 383 | .set_termios = sunhv_set_termios, |
| 384 | .type = sunhv_type, |
| 385 | .release_port = sunhv_release_port, |
| 386 | .request_port = sunhv_request_port, |
| 387 | .config_port = sunhv_config_port, |
| 388 | .verify_port = sunhv_verify_port, |
| 389 | }; |
| 390 | |
| 391 | static struct uart_driver sunhv_reg = { |
| 392 | .owner = THIS_MODULE, |
David S. Miller | 32039f4 | 2008-05-01 01:14:27 -0700 | [diff] [blame] | 393 | .driver_name = "sunhv", |
John Paul Adrian Glaubitz | 07a6d63 | 2019-06-11 17:38:37 +0200 | [diff] [blame] | 394 | .dev_name = "ttyHV", |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 395 | .major = TTY_MAJOR, |
| 396 | }; |
| 397 | |
| 398 | static struct uart_port *sunhv_port; |
| 399 | |
Vijay Kumar | 7dd4fcf | 2017-02-01 11:34:38 -0800 | [diff] [blame] | 400 | void sunhv_migrate_hvcons_irq(int cpu) |
| 401 | { |
| 402 | /* Migrate hvcons irq to param cpu */ |
| 403 | irq_force_affinity(sunhv_port->irq, cpumask_of(cpu)); |
| 404 | } |
| 405 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 406 | /* Copy 's' into the con_write_page, decoding "\n" into |
| 407 | * "\r\n" along the way. We have to return two lengths |
| 408 | * because the caller needs to know how much to advance |
| 409 | * 's' and also how many bytes to output via con_write_page. |
| 410 | */ |
| 411 | static int fill_con_write_page(const char *s, unsigned int n, |
| 412 | unsigned long *page_bytes) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 413 | { |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 414 | const char *orig_s = s; |
| 415 | char *p = con_write_page; |
| 416 | int left = PAGE_SIZE; |
| 417 | |
| 418 | while (n--) { |
| 419 | if (*s == '\n') { |
| 420 | if (left < 2) |
| 421 | break; |
| 422 | *p++ = '\r'; |
| 423 | left--; |
| 424 | } else if (left < 1) |
| 425 | break; |
| 426 | *p++ = *s++; |
| 427 | left--; |
| 428 | } |
| 429 | *page_bytes = p - con_write_page; |
| 430 | return s - orig_s; |
| 431 | } |
| 432 | |
| 433 | static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n) |
| 434 | { |
| 435 | struct uart_port *port = sunhv_port; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 436 | unsigned long flags; |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 437 | int locked = 1; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 438 | |
David Miller | e58e241 | 2014-03-04 15:28:35 -0500 | [diff] [blame] | 439 | if (port->sysrq || oops_in_progress) |
| 440 | locked = spin_trylock_irqsave(&port->lock, flags); |
| 441 | else |
| 442 | spin_lock_irqsave(&port->lock, flags); |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 443 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 444 | while (n > 0) { |
| 445 | unsigned long ra = __pa(con_write_page); |
| 446 | unsigned long page_bytes; |
| 447 | unsigned int cpy = fill_con_write_page(s, n, |
| 448 | &page_bytes); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 449 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 450 | n -= cpy; |
| 451 | s += cpy; |
| 452 | while (page_bytes > 0) { |
| 453 | unsigned long written; |
| 454 | int limit = 1000000; |
| 455 | |
| 456 | while (limit--) { |
| 457 | unsigned long stat; |
| 458 | |
| 459 | stat = sun4v_con_write(ra, page_bytes, |
| 460 | &written); |
| 461 | if (stat == HV_EOK) |
| 462 | break; |
| 463 | udelay(1); |
| 464 | } |
Roel Kluin | 52e3632 | 2009-06-22 18:41:56 +0100 | [diff] [blame] | 465 | if (limit < 0) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 466 | break; |
| 467 | page_bytes -= written; |
| 468 | ra += written; |
| 469 | } |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 470 | } |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 471 | |
| 472 | if (locked) |
David Miller | e58e241 | 2014-03-04 15:28:35 -0500 | [diff] [blame] | 473 | spin_unlock_irqrestore(&port->lock, flags); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 474 | } |
| 475 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 476 | static inline void sunhv_console_putchar(struct uart_port *port, char c) |
| 477 | { |
| 478 | int limit = 1000000; |
| 479 | |
| 480 | while (limit-- > 0) { |
| 481 | long status = sun4v_con_putchar(c); |
| 482 | if (status == HV_EOK) |
| 483 | break; |
| 484 | udelay(1); |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 489 | { |
| 490 | struct uart_port *port = sunhv_port; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 491 | unsigned long flags; |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 492 | int i, locked = 1; |
| 493 | |
David Miller | e58e241 | 2014-03-04 15:28:35 -0500 | [diff] [blame] | 494 | if (port->sysrq || oops_in_progress) |
| 495 | locked = spin_trylock_irqsave(&port->lock, flags); |
| 496 | else |
| 497 | spin_lock_irqsave(&port->lock, flags); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 498 | |
| 499 | for (i = 0; i < n; i++) { |
| 500 | if (*s == '\n') |
| 501 | sunhv_console_putchar(port, '\r'); |
| 502 | sunhv_console_putchar(port, *s++); |
| 503 | } |
David S. Miller | f3c681c | 2007-07-15 23:53:32 -0700 | [diff] [blame] | 504 | |
| 505 | if (locked) |
David Miller | e58e241 | 2014-03-04 15:28:35 -0500 | [diff] [blame] | 506 | spin_unlock_irqrestore(&port->lock, flags); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 507 | } |
| 508 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 509 | static struct console sunhv_console = { |
David S. Miller | d5a2aa2 | 2006-02-13 21:28:40 -0800 | [diff] [blame] | 510 | .name = "ttyHV", |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 511 | .write = sunhv_console_write_bychar, |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 512 | .device = uart_console_device, |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 513 | .flags = CON_PRINTBUFFER, |
| 514 | .index = -1, |
| 515 | .data = &sunhv_reg, |
| 516 | }; |
| 517 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 518 | static int hv_probe(struct platform_device *op) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 519 | { |
| 520 | struct uart_port *port; |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 521 | unsigned long minor; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 522 | int err; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 523 | |
Grant Likely | 1636f8a | 2010-06-18 11:09:58 -0600 | [diff] [blame] | 524 | if (op->archdata.irqs[0] == 0xffffffff) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 525 | return -ENODEV; |
| 526 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 527 | port = kzalloc(sizeof(struct uart_port), GFP_KERNEL); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 528 | if (unlikely(!port)) |
| 529 | return -ENOMEM; |
| 530 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 531 | minor = 1; |
| 532 | if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 && |
| 533 | minor >= 1) { |
| 534 | err = -ENOMEM; |
| 535 | con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 536 | if (!con_write_page) |
| 537 | goto out_free_port; |
| 538 | |
| 539 | con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 540 | if (!con_read_page) |
| 541 | goto out_free_con_write_page; |
| 542 | |
| 543 | sunhv_console.write = sunhv_console_write_paged; |
| 544 | sunhv_ops = &bywrite_ops; |
| 545 | } |
| 546 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 547 | sunhv_port = port; |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 548 | |
Dmitry Safonov | b071126 | 2019-12-13 00:06:44 +0000 | [diff] [blame] | 549 | port->has_sysrq = 1; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 550 | port->line = 0; |
| 551 | port->ops = &sunhv_pops; |
| 552 | port->type = PORT_SUNHV; |
| 553 | port->uartclk = ( 29491200 / 16 ); /* arbitrary */ |
| 554 | |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 555 | port->membase = (unsigned char __iomem *) __pa(port); |
| 556 | |
Grant Likely | 1636f8a | 2010-06-18 11:09:58 -0600 | [diff] [blame] | 557 | port->irq = op->archdata.irqs[0]; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 558 | |
| 559 | port->dev = &op->dev; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 560 | |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 561 | err = sunserial_register_minors(&sunhv_reg, 1); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 562 | if (err) |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 563 | goto out_free_con_read_page; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 564 | |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 565 | sunserial_console_match(&sunhv_console, op->dev.of_node, |
David S. Miller | 457931d | 2009-11-24 14:09:56 -0800 | [diff] [blame] | 566 | &sunhv_reg, port->line, false); |
David S. Miller | d5a2aa2 | 2006-02-13 21:28:40 -0800 | [diff] [blame] | 567 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 568 | err = uart_add_one_port(&sunhv_reg, port); |
| 569 | if (err) |
| 570 | goto out_unregister_driver; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 571 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 572 | err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port); |
| 573 | if (err) |
| 574 | goto out_remove_port; |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 575 | |
Jingoo Han | 696faed | 2013-05-23 19:39:36 +0900 | [diff] [blame] | 576 | platform_set_drvdata(op, port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 577 | |
| 578 | return 0; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 579 | |
| 580 | out_remove_port: |
| 581 | uart_remove_one_port(&sunhv_reg, port); |
| 582 | |
| 583 | out_unregister_driver: |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 584 | sunserial_unregister_minors(&sunhv_reg, 1); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 585 | |
David S. Miller | c7754d4 | 2007-05-15 17:03:54 -0700 | [diff] [blame] | 586 | out_free_con_read_page: |
| 587 | kfree(con_read_page); |
| 588 | |
| 589 | out_free_con_write_page: |
| 590 | kfree(con_write_page); |
| 591 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 592 | out_free_port: |
| 593 | kfree(port); |
| 594 | sunhv_port = NULL; |
| 595 | return err; |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 596 | } |
| 597 | |
Bill Pemberton | ae8d8a1 | 2012-11-19 13:26:18 -0500 | [diff] [blame] | 598 | static int hv_remove(struct platform_device *dev) |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 599 | { |
Jingoo Han | 696faed | 2013-05-23 19:39:36 +0900 | [diff] [blame] | 600 | struct uart_port *port = platform_get_drvdata(dev); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 601 | |
David S. Miller | db33f9b | 2006-02-15 21:56:49 -0800 | [diff] [blame] | 602 | free_irq(port->irq, port); |
| 603 | |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 604 | uart_remove_one_port(&sunhv_reg, port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 605 | |
Martin Habets | 58d784a | 2007-12-11 03:37:04 -0800 | [diff] [blame] | 606 | sunserial_unregister_minors(&sunhv_reg, 1); |
Souptick Joarder | fbb7d2e | 2016-11-14 18:07:36 +0530 | [diff] [blame] | 607 | kfree(con_read_page); |
| 608 | kfree(con_write_page); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 609 | kfree(port); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 610 | sunhv_port = NULL; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 611 | |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 612 | return 0; |
| 613 | } |
| 614 | |
David S. Miller | fd09831 | 2008-08-31 01:23:17 -0700 | [diff] [blame] | 615 | static const struct of_device_id hv_match[] = { |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 616 | { |
| 617 | .name = "console", |
| 618 | .compatible = "qcn", |
| 619 | }, |
David S. Miller | 7a05b59 | 2007-05-13 21:27:37 -0700 | [diff] [blame] | 620 | { |
| 621 | .name = "console", |
| 622 | .compatible = "SUNW,sun4v-console", |
| 623 | }, |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 624 | {}, |
| 625 | }; |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 626 | |
Grant Likely | 793218d | 2011-02-22 21:10:26 -0700 | [diff] [blame] | 627 | static struct platform_driver hv_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 628 | .driver = { |
| 629 | .name = "hv", |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 630 | .of_match_table = hv_match, |
| 631 | }, |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 632 | .probe = hv_probe, |
Bill Pemberton | 2d47b71 | 2012-11-19 13:21:34 -0500 | [diff] [blame] | 633 | .remove = hv_remove, |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 634 | }; |
| 635 | |
| 636 | static int __init sunhv_init(void) |
| 637 | { |
| 638 | if (tlb_type != hypervisor) |
| 639 | return -ENODEV; |
| 640 | |
Grant Likely | 793218d | 2011-02-22 21:10:26 -0700 | [diff] [blame] | 641 | return platform_driver_register(&hv_driver); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 642 | } |
Paul Gortmaker | 4fef535 | 2015-07-21 22:02:18 -0400 | [diff] [blame] | 643 | device_initcall(sunhv_init); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 644 | |
Paul Gortmaker | 4fef535 | 2015-07-21 22:02:18 -0400 | [diff] [blame] | 645 | #if 0 /* ...def MODULE ; never supported as such */ |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 646 | MODULE_AUTHOR("David S. Miller"); |
David S. Miller | 93872ba | 2006-06-30 00:00:22 -0700 | [diff] [blame] | 647 | MODULE_DESCRIPTION("SUN4V Hypervisor console driver"); |
| 648 | MODULE_VERSION("2.0"); |
David S. Miller | 02fd473 | 2006-02-11 02:25:21 -0800 | [diff] [blame] | 649 | MODULE_LICENSE("GPL"); |
Paul Gortmaker | 4fef535 | 2015-07-21 22:02:18 -0400 | [diff] [blame] | 650 | #endif |