228 lines
7.4 KiB
C
228 lines
7.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* linux/include/linux/serial_8250.h
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*
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* Copyright (C) 2004 Russell King
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*/
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#ifndef _LINUX_SERIAL_8250_H
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#define _LINUX_SERIAL_8250_H
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#include <linux/errno.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/platform_device.h>
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struct uart_8250_port;
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/*
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* This is the platform device platform_data structure
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*
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* @mapsize: Port size for ioremap()
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* @bugs: Port bugs
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*
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* @dl_read: ``u32 ()(struct uart_8250_port *up)``
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*
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* UART divisor latch read.
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*
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* @dl_write: ``void ()(struct uart_8250_port *up, u32 value)``
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*
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* Write @value into UART divisor latch.
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*
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* Locking: Caller holds port's lock.
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*/
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struct plat_serial8250_port {
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unsigned long iobase; /* io base address */
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void __iomem *membase; /* ioremap cookie or NULL */
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resource_size_t mapbase; /* resource base */
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resource_size_t mapsize;
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unsigned int uartclk; /* UART clock rate */
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unsigned int irq; /* interrupt number */
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unsigned long irqflags; /* request_irq flags */
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void *private_data;
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unsigned char regshift; /* register shift */
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unsigned char iotype; /* UPIO_* */
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unsigned char hub6;
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unsigned char has_sysrq; /* supports magic SysRq */
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unsigned int type; /* If UPF_FIXED_TYPE */
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upf_t flags; /* UPF_* flags */
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u16 bugs; /* port bugs */
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unsigned int (*serial_in)(struct uart_port *, int);
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void (*serial_out)(struct uart_port *, int, int);
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u32 (*dl_read)(struct uart_8250_port *up);
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void (*dl_write)(struct uart_8250_port *up, u32 value);
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void (*set_termios)(struct uart_port *,
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struct ktermios *new,
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const struct ktermios *old);
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void (*set_ldisc)(struct uart_port *,
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struct ktermios *);
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unsigned int (*get_mctrl)(struct uart_port *);
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int (*handle_irq)(struct uart_port *);
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void (*pm)(struct uart_port *, unsigned int state,
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unsigned old);
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void (*handle_break)(struct uart_port *);
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};
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/*
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* Allocate 8250 platform device IDs. Nothing is implied by
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* the numbering here, except for the legacy entry being -1.
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*/
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enum {
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PLAT8250_DEV_LEGACY = -1,
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PLAT8250_DEV_PLATFORM,
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PLAT8250_DEV_PLATFORM1,
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PLAT8250_DEV_PLATFORM2,
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PLAT8250_DEV_FOURPORT,
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PLAT8250_DEV_ACCENT,
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PLAT8250_DEV_BOCA,
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PLAT8250_DEV_EXAR_ST16C554,
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PLAT8250_DEV_HUB6,
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PLAT8250_DEV_AU1X00,
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PLAT8250_DEV_SM501,
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};
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struct uart_8250_dma;
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struct uart_8250_port;
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/**
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* 8250 core driver operations
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*
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* @setup_irq() Setup irq handling. The universal 8250 driver links this
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* port to the irq chain. Other drivers may @request_irq().
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* @release_irq() Undo irq handling. The universal 8250 driver unlinks
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* the port from the irq chain.
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*/
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struct uart_8250_ops {
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int (*setup_irq)(struct uart_8250_port *);
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void (*release_irq)(struct uart_8250_port *);
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void (*setup_timer)(struct uart_8250_port *);
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};
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struct uart_8250_em485 {
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struct hrtimer start_tx_timer; /* "rs485 start tx" timer */
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struct hrtimer stop_tx_timer; /* "rs485 stop tx" timer */
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struct hrtimer *active_timer; /* pointer to active timer */
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struct uart_8250_port *port; /* for hrtimer callbacks */
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unsigned int tx_stopped:1; /* tx is currently stopped */
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};
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/*
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* This should be used by drivers which want to register
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* their own 8250 ports without registering their own
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* platform device. Using these will make your driver
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* dependent on the 8250 driver.
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*
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* @dl_read: ``u32 ()(struct uart_8250_port *port)``
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*
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* UART divisor latch read.
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*
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* @dl_write: ``void ()(struct uart_8250_port *port, u32 value)``
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*
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* Write @value into UART divisor latch.
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*
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* Locking: Caller holds port's lock.
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*/
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struct uart_8250_port {
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struct uart_port port;
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struct timer_list timer; /* "no irq" timer */
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struct list_head list; /* ports on this IRQ */
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u32 capabilities; /* port capabilities */
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u16 bugs; /* port bugs */
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unsigned int tx_loadsz; /* transmit fifo load size */
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unsigned char acr;
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unsigned char fcr;
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unsigned char ier;
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unsigned char lcr;
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unsigned char mcr;
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unsigned char cur_iotype; /* Running I/O type */
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unsigned int rpm_tx_active;
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unsigned char canary; /* non-zero during system sleep
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* if no_console_suspend
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*/
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unsigned char probe;
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struct mctrl_gpios *gpios;
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#define UART_PROBE_RSA (1 << 0)
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/*
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* Some bits in registers are cleared on a read, so they must
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* be saved whenever the register is read but the bits will not
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* be immediately processed.
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*/
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#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
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u16 lsr_saved_flags;
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u16 lsr_save_mask;
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#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
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unsigned char msr_saved_flags;
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struct uart_8250_dma *dma;
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const struct uart_8250_ops *ops;
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/* 8250 specific callbacks */
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u32 (*dl_read)(struct uart_8250_port *up);
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void (*dl_write)(struct uart_8250_port *up, u32 value);
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struct uart_8250_em485 *em485;
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void (*rs485_start_tx)(struct uart_8250_port *);
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void (*rs485_stop_tx)(struct uart_8250_port *);
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/* Serial port overrun backoff */
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struct delayed_work overrun_backoff;
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u32 overrun_backoff_time_ms;
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};
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static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
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{
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return container_of(up, struct uart_8250_port, port);
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}
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int serial8250_register_8250_port(const struct uart_8250_port *);
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void serial8250_unregister_port(int line);
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void serial8250_suspend_port(int line);
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void serial8250_resume_port(int line);
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int early_serial_setup(struct uart_port *port);
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int early_serial8250_setup(struct earlycon_device *device, const char *options);
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void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk);
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void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
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const struct ktermios *old);
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void serial8250_do_set_ldisc(struct uart_port *port, struct ktermios *termios);
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unsigned int serial8250_do_get_mctrl(struct uart_port *port);
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int serial8250_do_startup(struct uart_port *port);
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void serial8250_do_shutdown(struct uart_port *port);
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void serial8250_do_pm(struct uart_port *port, unsigned int state,
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unsigned int oldstate);
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void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
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void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
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unsigned int quot, unsigned int quot_frac);
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int fsl8250_handle_irq(struct uart_port *port);
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int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
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u16 serial8250_rx_chars(struct uart_8250_port *up, u16 lsr);
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void serial8250_read_char(struct uart_8250_port *up, u16 lsr);
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void serial8250_tx_chars(struct uart_8250_port *up);
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unsigned int serial8250_modem_status(struct uart_8250_port *up);
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void serial8250_init_port(struct uart_8250_port *up);
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void serial8250_set_defaults(struct uart_8250_port *up);
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void serial8250_console_write(struct uart_8250_port *up, const char *s,
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unsigned int count);
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int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
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int serial8250_console_exit(struct uart_port *port);
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void serial8250_set_isa_configurator(void (*v)(int port, struct uart_port *up,
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u32 *capabilities));
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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extern int hp300_setup_serial_console(void) __init;
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#else
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static inline int hp300_setup_serial_console(void) { return 0; }
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#endif
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#ifdef CONFIG_SERIAL_8250_RT288X
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int rt288x_setup(struct uart_port *p);
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int au_platform_setup(struct plat_serial8250_port *p);
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#else
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static inline int rt288x_setup(struct uart_port *p) { return -ENODEV; }
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static inline int au_platform_setup(struct plat_serial8250_port *p) { return -ENODEV; }
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#endif
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#endif
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