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linux-headers-6.8.0-101-generic
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serial_8250.h
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/* 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/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 */ void *private_data; unsigned char regshift; /* register shift */ unsigned char iotype; /* UPIO_* */ unsigned char hub6; unsigned char has_sysrq; /* supports magic SysRq */ unsigned int type; /* If UPF_FIXED_TYPE */ upf_t flags; /* UPF_* flags */ u16 bugs; /* port bugs */ unsigned int (*serial_in)(struct uart_port *, int); void (*serial_out)(struct uart_port *, int, int); 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, 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); 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 *); 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 */ 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 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 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 */ 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 *); 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(const struct uart_8250_port *); void serial8250_unregister_port(int line); void serial8250_suspend_port(int line); void serial8250_resume_port(int line); 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, unsigned int quot_frac); int fsl8250_handle_irq(struct uart_port *port); int serial8250_handle_irq(struct uart_port *port, unsigned int iir); 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); void serial8250_set_isa_configurator(void (*v)(int port, struct uart_port *up, u32 *capabilities)); #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