LXR linux/include/linux/serial

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *  linux/include/linux/serial_8250.h
   4 *
   5 *  Copyright (C) 2004 Russell King
   6 */
   7#ifndef _LINUX_SERIAL_8250_H
   8#define _LINUX_SERIAL_8250_H
   9
  10#include <linux/serial_core.h>
  11#include <linux/serial_reg.h>
  12#include <linux/platform_device.h>
  13
  14/*
  15 * This is the platform device platform_data structure
  16 */
  17struct plat_serial8250_port {
  18        unsigned long   iobase;         /* io base address */
  19        void __iomem    *membase;       /* ioremap cookie or NULL */
  20        resource_size_t mapbase;        /* resource base */
  21        unsigned int    irq;            /* interrupt number */
  22        unsigned long   irqflags;       /* request_irq flags */
  23        unsigned int    uartclk;        /* UART clock rate */
  24        void            *private_data;
  25        unsigned char   regshift;       /* register shift */
  26        unsigned char   iotype;         /* UPIO_* */
  27        unsigned char   hub6;
  28        upf_t           flags;          /* UPF_* flags */
  29        unsigned int    type;           /* If UPF_FIXED_TYPE */
  30        unsigned int    (*serial_in)(struct uart_port *, int);
  31        void            (*serial_out)(struct uart_port *, int, int);
  32        void            (*set_termios)(struct uart_port *,
  33                                       struct ktermios *new,
  34                                       struct ktermios *old);
  35        void            (*set_ldisc)(struct uart_port *,
  36                                     struct ktermios *);
  37        unsigned int    (*get_mctrl)(struct uart_port *);
  38        int             (*handle_irq)(struct uart_port *);
  39        void            (*pm)(struct uart_port *, unsigned int state,
  40                              unsigned old);
  41        void            (*handle_break)(struct uart_port *);
  42};
  43
  44/*
  45 * Allocate 8250 platform device IDs.  Nothing is implied by
  46 * the numbering here, except for the legacy entry being -1.
  47 */
  48enum {
  49        PLAT8250_DEV_LEGACY = -1,
  50        PLAT8250_DEV_PLATFORM,
  51        PLAT8250_DEV_PLATFORM1,
  52        PLAT8250_DEV_PLATFORM2,
  53        PLAT8250_DEV_FOURPORT,
  54        PLAT8250_DEV_ACCENT,
  55        PLAT8250_DEV_BOCA,
  56        PLAT8250_DEV_EXAR_ST16C554,
  57        PLAT8250_DEV_HUB6,
  58        PLAT8250_DEV_AU1X00,
  59        PLAT8250_DEV_SM501,
  60};
  61
  62struct uart_8250_dma;
  63struct uart_8250_port;
  64
  65/**
  66 * 8250 core driver operations
  67 *
  68 * @setup_irq()         Setup irq handling. The universal 8250 driver links this
  69 *                      port to the irq chain. Other drivers may @request_irq().
  70 * @release_irq()       Undo irq handling. The universal 8250 driver unlinks
  71 *                      the port from the irq chain.
  72 */
  73struct uart_8250_ops {
  74        int             (*setup_irq)(struct uart_8250_port *);
  75        void            (*release_irq)(struct uart_8250_port *);
  76};
  77
  78struct uart_8250_em485 {
  79        struct hrtimer          start_tx_timer; /* "rs485 start tx" timer */
  80        struct hrtimer          stop_tx_timer;  /* "rs485 stop tx" timer */
  81        struct hrtimer          *active_timer;  /* pointer to active timer */
  82        struct uart_8250_port   *port;          /* for hrtimer callbacks */
  83};
  84
  85/*
  86 * This should be used by drivers which want to register
  87 * their own 8250 ports without registering their own
  88 * platform device.  Using these will make your driver
  89 * dependent on the 8250 driver.
  90 */
  91
  92struct uart_8250_port {
  93        struct uart_port        port;
  94        struct timer_list       timer;          /* "no irq" timer */
  95        struct list_head        list;           /* ports on this IRQ */
  96        u32                     capabilities;   /* port capabilities */
  97        unsigned short          bugs;           /* port bugs */
  98        bool                    fifo_bug;       /* min RX trigger if enabled */
  99        unsigned int            tx_loadsz;      /* transmit fifo load size */
 100        unsigned char           acr;
 101        unsigned char           fcr;
 102        unsigned char           ier;
 103        unsigned char           lcr;
 104        unsigned char           mcr;
 105        unsigned char           mcr_mask;       /* mask of user bits */
 106        unsigned char           mcr_force;      /* mask of forced bits */
 107        unsigned char           cur_iotype;     /* Running I/O type */
 108        unsigned int            rpm_tx_active;
 109        unsigned char           canary;         /* non-zero during system sleep
 110                                                 *   if no_console_suspend
 111                                                 */
 112        unsigned char           probe;
 113        struct mctrl_gpios      *gpios;
 114#define UART_PROBE_RSA  (1 << 0)
 115
 116        /*
 117         * Some bits in registers are cleared on a read, so they must
 118         * be saved whenever the register is read but the bits will not
 119         * be immediately processed.
 120         */
 121#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
 122        unsigned char           lsr_saved_flags;
 123#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
 124        unsigned char           msr_saved_flags;
 125
 126        struct uart_8250_dma    *dma;
 127        const struct uart_8250_ops *ops;
 128
 129        /* 8250 specific callbacks */
 130        int                     (*dl_read)(struct uart_8250_port *);
 131        void                    (*dl_write)(struct uart_8250_port *, int);
 132
 133        struct uart_8250_em485 *em485;
 134
 135        /* Serial port overrun backoff */
 136        struct delayed_work overrun_backoff;
 137        u32 overrun_backoff_time_ms;
 138};
 139
 140static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
 141{
 142        return container_of(up, struct uart_8250_port, port);
 143}
 144
 145int serial8250_register_8250_port(struct uart_8250_port *);
 146void serial8250_unregister_port(int line);
 147void serial8250_suspend_port(int line);
 148void serial8250_resume_port(int line);
 149
 150extern int early_serial_setup(struct uart_port *port);
 151
 152extern int early_serial8250_setup(struct earlycon_device *device,
 153                                         const char *options);
 154extern void serial8250_do_set_termios(struct uart_port *port,
 155                struct ktermios *termios, struct ktermios *old);
 156extern void serial8250_do_set_ldisc(struct uart_port *port,
 157                                    struct ktermios *termios);
 158extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
 159extern int serial8250_do_startup(struct uart_port *port);
 160extern void serial8250_do_shutdown(struct uart_port *port);
 161extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
 162                             unsigned int oldstate);
 163extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 164extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
 165                                      unsigned int quot,
 166                                      unsigned int quot_frac);
 167extern int fsl8250_handle_irq(struct uart_port *port);
 168int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 169unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
 170void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
 171void serial8250_tx_chars(struct uart_8250_port *up);
 172unsigned int serial8250_modem_status(struct uart_8250_port *up);
 173void serial8250_init_port(struct uart_8250_port *up);
 174void serial8250_set_defaults(struct uart_8250_port *up);
 175void serial8250_console_write(struct uart_8250_port *up, const char *s,
 176                              unsigned int count);
 177int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
 178
 179extern void serial8250_set_isa_configurator(void (*v)
 180                                        (int port, struct uart_port *up,
 181                                                u32 *capabilities));
 182
 183#endif
 184