| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * linux/include/linux/serial_8250.h |
| * |
| * Copyright (C) 2004 Russell King |
| */ |
| #ifndef _LINUX_SERIAL_8250_H |
| #define _LINUX_SERIAL_8250_H |
| |
| #include <linux/serial_core.h> |
| #include <linux/serial_reg.h> |
| #include <linux/platform_device.h> |
| |
| /* |
| * This is the platform device platform_data structure |
| */ |
| struct plat_serial8250_port { |
| unsigned long iobase; /* io base address */ |
| void __iomem *membase; /* ioremap cookie or NULL */ |
| resource_size_t mapbase; /* resource base */ |
| unsigned int irq; /* interrupt number */ |
| unsigned long irqflags; /* request_irq flags */ |
| unsigned int uartclk; /* UART clock rate */ |
| void *private_data; |
| unsigned char regshift; /* register shift */ |
| unsigned char iotype; /* UPIO_* */ |
| unsigned char hub6; |
| unsigned char has_sysrq; /* supports magic SysRq */ |
| upf_t flags; /* UPF_* flags */ |
| unsigned int type; /* If UPF_FIXED_TYPE */ |
| unsigned int (*serial_in)(struct uart_port *, int); |
| void (*serial_out)(struct uart_port *, int, int); |
| void (*set_termios)(struct uart_port *, |
| struct ktermios *new, |
| struct ktermios *old); |
| void (*set_ldisc)(struct uart_port *, |
| struct ktermios *); |
| unsigned int (*get_mctrl)(struct uart_port *); |
| int (*handle_irq)(struct uart_port *); |
| void (*pm)(struct uart_port *, unsigned int state, |
| unsigned old); |
| void (*handle_break)(struct uart_port *); |
| }; |
| |
| /* |
| * Allocate 8250 platform device IDs. Nothing is implied by |
| * the numbering here, except for the legacy entry being -1. |
| */ |
| enum { |
| PLAT8250_DEV_LEGACY = -1, |
| PLAT8250_DEV_PLATFORM, |
| PLAT8250_DEV_PLATFORM1, |
| PLAT8250_DEV_PLATFORM2, |
| PLAT8250_DEV_FOURPORT, |
| PLAT8250_DEV_ACCENT, |
| PLAT8250_DEV_BOCA, |
| PLAT8250_DEV_EXAR_ST16C554, |
| PLAT8250_DEV_HUB6, |
| PLAT8250_DEV_AU1X00, |
| PLAT8250_DEV_SM501, |
| }; |
| |
| struct uart_8250_dma; |
| struct uart_8250_port; |
| |
| /** |
| * 8250 core driver operations |
| * |
| * @setup_irq() Setup irq handling. The universal 8250 driver links this |
| * port to the irq chain. Other drivers may @request_irq(). |
| * @release_irq() Undo irq handling. The universal 8250 driver unlinks |
| * the port from the irq chain. |
| */ |
| struct uart_8250_ops { |
| int (*setup_irq)(struct uart_8250_port *); |
| void (*release_irq)(struct uart_8250_port *); |
| }; |
| |
| struct uart_8250_em485 { |
| struct hrtimer start_tx_timer; /* "rs485 start tx" timer */ |
| struct hrtimer stop_tx_timer; /* "rs485 stop tx" timer */ |
| struct hrtimer *active_timer; /* pointer to active timer */ |
| struct uart_8250_port *port; /* for hrtimer callbacks */ |
| unsigned int tx_stopped:1; /* tx is currently stopped */ |
| }; |
| |
| /* |
| * This should be used by drivers which want to register |
| * their own 8250 ports without registering their own |
| * platform device. Using these will make your driver |
| * dependent on the 8250 driver. |
| */ |
| |
| struct uart_8250_port { |
| struct uart_port port; |
| struct timer_list timer; /* "no irq" timer */ |
| struct list_head list; /* ports on this IRQ */ |
| u32 capabilities; /* port capabilities */ |
| unsigned short bugs; /* port bugs */ |
| bool fifo_bug; /* min RX trigger if enabled */ |
| unsigned int tx_loadsz; /* transmit fifo load size */ |
| unsigned char acr; |
| unsigned char fcr; |
| unsigned char ier; |
| unsigned char lcr; |
| unsigned char mcr; |
| unsigned char mcr_mask; /* mask of user bits */ |
| unsigned char mcr_force; /* mask of forced bits */ |
| unsigned char cur_iotype; /* Running I/O type */ |
| unsigned int rpm_tx_active; |
| unsigned char canary; /* non-zero during system sleep |
| * if no_console_suspend |
| */ |
| unsigned char probe; |
| struct mctrl_gpios *gpios; |
| #define UART_PROBE_RSA (1 << 0) |
| |
| /* |
| * Some bits in registers are cleared on a read, so they must |
| * be saved whenever the register is read but the bits will not |
| * be immediately processed. |
| */ |
| #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS |
| unsigned char lsr_saved_flags; |
| #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA |
| unsigned char msr_saved_flags; |
| |
| struct uart_8250_dma *dma; |
| const struct uart_8250_ops *ops; |
| |
| /* 8250 specific callbacks */ |
| int (*dl_read)(struct uart_8250_port *); |
| void (*dl_write)(struct uart_8250_port *, int); |
| |
| struct uart_8250_em485 *em485; |
| void (*rs485_start_tx)(struct uart_8250_port *); |
| void (*rs485_stop_tx)(struct uart_8250_port *); |
| |
| /* Serial port overrun backoff */ |
| struct delayed_work overrun_backoff; |
| u32 overrun_backoff_time_ms; |
| }; |
| |
| static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up) |
| { |
| return container_of(up, struct uart_8250_port, port); |
| } |
| |
| int serial8250_register_8250_port(struct uart_8250_port *); |
| void serial8250_unregister_port(int line); |
| void serial8250_suspend_port(int line); |
| void serial8250_resume_port(int line); |
| |
| extern int early_serial_setup(struct uart_port *port); |
| |
| extern int early_serial8250_setup(struct earlycon_device *device, |
| const char *options); |
| extern void serial8250_update_uartclk(struct uart_port *port, |
| unsigned int uartclk); |
| extern void serial8250_do_set_termios(struct uart_port *port, |
| struct ktermios *termios, struct ktermios *old); |
| extern void serial8250_do_set_ldisc(struct uart_port *port, |
| struct ktermios *termios); |
| extern unsigned int serial8250_do_get_mctrl(struct uart_port *port); |
| extern int serial8250_do_startup(struct uart_port *port); |
| extern void serial8250_do_shutdown(struct uart_port *port); |
| extern void serial8250_do_pm(struct uart_port *port, unsigned int state, |
| unsigned int oldstate); |
| extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl); |
| extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud, |
| unsigned int quot, |
| unsigned int quot_frac); |
| extern int fsl8250_handle_irq(struct uart_port *port); |
| int serial8250_handle_irq(struct uart_port *port, unsigned int iir); |
| unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr); |
| void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr); |
| void serial8250_tx_chars(struct uart_8250_port *up); |
| unsigned int serial8250_modem_status(struct uart_8250_port *up); |
| void serial8250_init_port(struct uart_8250_port *up); |
| void serial8250_set_defaults(struct uart_8250_port *up); |
| void serial8250_console_write(struct uart_8250_port *up, const char *s, |
| unsigned int count); |
| int serial8250_console_setup(struct uart_port *port, char *options, bool probe); |
| int serial8250_console_exit(struct uart_port *port); |
| |
| extern void serial8250_set_isa_configurator(void (*v) |
| (int port, struct uart_port *up, |
| u32 *capabilities)); |
| |
| #ifdef CONFIG_SERIAL_8250_RT288X |
| unsigned int au_serial_in(struct uart_port *p, int offset); |
| void au_serial_out(struct uart_port *p, int offset, int value); |
| #endif |
| |
| #endif |