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195 lines
6.6 KiB
195 lines
6.6 KiB
/* 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/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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/* |
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* This is the platform device platform_data structure |
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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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unsigned int irq; /* interrupt number */ |
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unsigned long irqflags; /* request_irq flags */ |
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unsigned int uartclk; /* UART clock rate */ |
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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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upf_t flags; /* UPF_* flags */ |
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unsigned int type; /* If UPF_FIXED_TYPE */ |
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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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void (*set_termios)(struct uart_port *, |
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struct ktermios *new, |
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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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}; |
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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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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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unsigned short bugs; /* port bugs */ |
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bool fifo_bug; /* min RX trigger if enabled */ |
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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 mcr_mask; /* mask of user bits */ |
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unsigned char mcr_force; /* mask of forced bits */ |
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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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unsigned char lsr_saved_flags; |
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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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int (*dl_read)(struct uart_8250_port *); |
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void (*dl_write)(struct uart_8250_port *, int); |
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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(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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extern int early_serial_setup(struct uart_port *port); |
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extern int early_serial8250_setup(struct earlycon_device *device, |
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const char *options); |
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extern void serial8250_update_uartclk(struct uart_port *port, |
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unsigned int uartclk); |
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extern void serial8250_do_set_termios(struct uart_port *port, |
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struct ktermios *termios, struct ktermios *old); |
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extern void serial8250_do_set_ldisc(struct uart_port *port, |
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struct ktermios *termios); |
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extern unsigned int serial8250_do_get_mctrl(struct uart_port *port); |
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extern int serial8250_do_startup(struct uart_port *port); |
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extern void serial8250_do_shutdown(struct uart_port *port); |
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extern void serial8250_do_pm(struct uart_port *port, unsigned int state, |
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unsigned int oldstate); |
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extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl); |
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extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud, |
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unsigned int quot, |
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unsigned int quot_frac); |
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extern 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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unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr); |
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void serial8250_read_char(struct uart_8250_port *up, unsigned char 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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extern void serial8250_set_isa_configurator(void (*v) |
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(int port, struct uart_port *up, |
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u32 *capabilities)); |
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#ifdef CONFIG_SERIAL_8250_RT288X |
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unsigned int au_serial_in(struct uart_port *p, int offset); |
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void au_serial_out(struct uart_port *p, int offset, int value); |
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#endif |
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#endif
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