diff options
Diffstat (limited to 'include/linux/serial_8250.h')
| -rw-r--r-- | include/linux/serial_8250.h | 168 |
1 files changed, 133 insertions, 35 deletions
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index af47a8af6024..01efdce0fda0 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -1,40 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * linux/include/linux/serial_8250.h * * Copyright (C) 2004 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. */ #ifndef _LINUX_SERIAL_8250_H #define _LINUX_SERIAL_8250_H +#include <linux/errno.h> #include <linux/serial_core.h> +#include <linux/serial_reg.h> #include <linux/platform_device.h> +struct uart_8250_port; + /* * This is the platform device platform_data structure + * + * @mapsize: Port size for ioremap() + * @bugs: Port bugs + * + * @dl_read: ``u32 ()(struct uart_8250_port *up)`` + * + * UART divisor latch read. + * + * @dl_write: ``void ()(struct uart_8250_port *up, u32 value)`` + * + * Write @value into UART divisor latch. + * + * Locking: Caller holds port's lock. */ struct plat_serial8250_port { unsigned long iobase; /* io base address */ void __iomem *membase; /* ioremap cookie or NULL */ resource_size_t mapbase; /* resource base */ + resource_size_t mapsize; + unsigned int uartclk; /* UART clock rate */ 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; - upf_t flags; /* UPF_* flags */ + unsigned char has_sysrq; /* supports magic SysRq */ unsigned int type; /* If UPF_FIXED_TYPE */ - unsigned int (*serial_in)(struct uart_port *, int); - void (*serial_out)(struct uart_port *, int, int); + upf_t flags; /* UPF_* flags */ + u16 bugs; /* port bugs */ + u32 (*serial_in)(struct uart_port *, unsigned int offset); + void (*serial_out)(struct uart_port *, unsigned int offset, u32 val); + u32 (*dl_read)(struct uart_8250_port *up); + void (*dl_write)(struct uart_8250_port *up, u32 value); void (*set_termios)(struct uart_port *, struct ktermios *new, - struct ktermios *old); + const 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); @@ -60,28 +81,66 @@ enum { }; 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 *); + void (*setup_timer)(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. + * + * @dl_read: ``u32 ()(struct uart_8250_port *port)`` + * + * UART divisor latch read. + * + * @dl_write: ``void ()(struct uart_8250_port *port, u32 value)`` + * + * Write @value into UART divisor latch. + * + * Locking: Caller holds port's lock. */ - struct uart_8250_port { struct uart_port port; struct timer_list timer; /* "no irq" timer */ struct list_head list; /* ports on this IRQ */ - unsigned short capabilities; /* port capabilities */ - unsigned short bugs; /* port bugs */ + u32 capabilities; /* port capabilities */ + u16 bugs; /* port bugs */ 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 @@ -89,41 +148,80 @@ struct uart_8250_port { * be immediately processed. */ #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS - unsigned char lsr_saved_flags; + u16 lsr_saved_flags; + u16 lsr_save_mask; #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); + u32 (*dl_read)(struct uart_8250_port *up); + void (*dl_write)(struct uart_8250_port *up, u32 value); + + struct uart_8250_em485 *em485; + void (*rs485_start_tx)(struct uart_8250_port *up, bool toggle_ier); + void (*rs485_stop_tx)(struct uart_8250_port *up, bool toggle_ier); + + /* Serial port overrun backoff */ + struct delayed_work overrun_backoff; + u32 overrun_backoff_time_ms; }; -int serial8250_register_8250_port(struct uart_8250_port *); +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(const 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 serial8250_find_port(struct uart_port *p); -extern int serial8250_find_port_for_earlycon(void); -extern unsigned int serial8250_early_in(struct uart_port *port, int offset); -extern void serial8250_early_out(struct uart_port *port, int offset, int value); -extern int setup_early_serial8250_console(char *cmdline); -extern void serial8250_do_set_termios(struct uart_port *port, - struct ktermios *termios, struct ktermios *old); -extern void serial8250_do_pm(struct uart_port *port, unsigned int state, - unsigned int oldstate); -extern int fsl8250_handle_irq(struct uart_port *port); +int early_serial_setup(struct uart_port *port); +int early_serial8250_setup(struct earlycon_device *device, const char *options); + +void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk); +void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, + const struct ktermios *old); +void serial8250_do_set_ldisc(struct uart_port *port, struct ktermios *termios); +unsigned int serial8250_do_get_mctrl(struct uart_port *port); +int serial8250_do_startup(struct uart_port *port); +void serial8250_do_shutdown(struct uart_port *port); +void serial8250_do_pm(struct uart_port *port, unsigned int state, + unsigned int oldstate); +void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl); +void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud, + unsigned int quot); +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); +u16 serial8250_rx_chars(struct uart_8250_port *up, u16 lsr); +void serial8250_read_char(struct uart_8250_port *up, u16 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, - unsigned short *capabilities)); +void serial8250_set_isa_configurator(void (*v)(int port, struct uart_port *up, + u32 *capabilities)); + +#ifdef CONFIG_SERIAL_8250_CONSOLE +extern int hp300_setup_serial_console(void) __init; +#else +static inline int hp300_setup_serial_console(void) { return 0; } +#endif + +#ifdef CONFIG_SERIAL_8250_RT288X +int rt288x_setup(struct uart_port *p); +int au_platform_setup(struct plat_serial8250_port *p); +#else +static inline int rt288x_setup(struct uart_port *p) { return -ENODEV; } +static inline int au_platform_setup(struct plat_serial8250_port *p) { return -ENODEV; } +#endif #endif |