include/linux/serial_8250.h

   1 /*
   2  *  linux/include/linux/serial_8250.h
   3  *
   4  *  Copyright (C) 2004 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11 #ifndef _LINUX_SERIAL_8250_H
  12 #define _LINUX_SERIAL_8250_H
  13
  14 #include <linux/serial_core.h>
  15 #include <linux/serial_reg.h>
  16 #include <linux/platform_device.h>
  17
  18 /*
  19  * This is the platform device platform_data structure
  20  */
  21 struct plat_serial8250_port {
  22         unsigned long   iobase;         /* io base address */
  23         void __iomem    *membase;       /* ioremap cookie or NULL */
  24         resource_size_t mapbase;        /* resource base */
  25         unsigned int    irq;            /* interrupt number */
  26         unsigned long   irqflags;       /* request_irq flags */
  27         unsigned int    uartclk;        /* UART clock rate */
  28         void            *private_data;
  29         unsigned char   regshift;       /* register shift */
  30         unsigned char   iotype;         /* UPIO_* */
  31         unsigned char   hub6;
  32         upf_t           flags;          /* UPF_* flags */
  33         unsigned int    type;           /* If UPF_FIXED_TYPE */
  34         unsigned int    (*serial_in)(struct uart_port *, int);
  35         void            (*serial_out)(struct uart_port *, int, int);
  36         void            (*set_termios)(struct uart_port *,
  37                                        struct ktermios *new,
  38                                        struct ktermios *old);
  39         int             (*handle_irq)(struct uart_port *);
  40         void            (*pm)(struct uart_port *, unsigned int state,
  41                               unsigned old);
  42         void            (*handle_break)(struct uart_port *);
  43 };
  44
  45 /*
  46  * Allocate 8250 platform device IDs.  Nothing is implied by
  47  * the numbering here, except for the legacy entry being -1.
  48  */
  49 enum {
  50         PLAT8250_DEV_LEGACY = -1,
  51         PLAT8250_DEV_PLATFORM,
  52         PLAT8250_DEV_PLATFORM1,
  53         PLAT8250_DEV_PLATFORM2,
  54         PLAT8250_DEV_FOURPORT,
  55         PLAT8250_DEV_ACCENT,
  56         PLAT8250_DEV_BOCA,
  57         PLAT8250_DEV_EXAR_ST16C554,
  58         PLAT8250_DEV_HUB6,
  59         PLAT8250_DEV_AU1X00,
  60         PLAT8250_DEV_SM501,
  61 };
  62
  63 struct uart_8250_dma;
  64 struct uart_8250_port;
  65
  66 /**
  67  * 8250 core driver operations
  68  *
  69  * @setup_irq()         Setup irq handling. The universal 8250 driver links this
  70  *                      port to the irq chain. Other drivers may @request_irq().
  71  * @release_irq()       Undo irq handling. The universal 8250 driver unlinks
  72  *                      the port from the irq chain.
  73  */
  74 struct uart_8250_ops {
  75         int             (*setup_irq)(struct uart_8250_port *);
  76         void            (*release_irq)(struct uart_8250_port *);
  77 };
  78
  79 struct uart_8250_em485 {
  80         struct timer_list       start_tx_timer; /* "rs485 start tx" timer */
  81         struct timer_list       stop_tx_timer;  /* "rs485 stop tx" timer */
  82         struct timer_list       *active_timer;  /* pointer to active timer */
  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
  92 struct 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         unsigned short          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 #define UART_PROBE_RSA  (1 << 0)
 114
 115         /*
 116          * Some bits in registers are cleared on a read, so they must
 117          * be saved whenever the register is read but the bits will not
 118          * be immediately processed.
 119          */
 120 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
 121         unsigned char           lsr_saved_flags;
 122 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
 123         unsigned char           msr_saved_flags;
 124
 125         struct uart_8250_dma    *dma;
 126         const struct uart_8250_ops *ops;
 127
 128         /* 8250 specific callbacks */
 129         int                     (*dl_read)(struct uart_8250_port *);
 130         void                    (*dl_write)(struct uart_8250_port *, int);
 131
 132         struct uart_8250_em485 *em485;
 133 };
 134
 135 static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
 136 {
 137         return container_of(up, struct uart_8250_port, port);
 138 }
 139
 140 int serial8250_register_8250_port(struct uart_8250_port *);
 141 void serial8250_unregister_port(int line);
 142 void serial8250_suspend_port(int line);
 143 void serial8250_resume_port(int line);
 144
 145 extern int early_serial_setup(struct uart_port *port);
 146
 147 extern int early_serial8250_setup(struct earlycon_device *device,
 148                                          const char *options);
 149 extern void serial8250_do_set_termios(struct uart_port *port,
 150                 struct ktermios *termios, struct ktermios *old);
 151 extern int serial8250_do_startup(struct uart_port *port);
 152 extern void serial8250_do_shutdown(struct uart_port *port);
 153 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
 154                              unsigned int oldstate);
 155 extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 156 extern int fsl8250_handle_irq(struct uart_port *port);
 157 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 158 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
 159 void serial8250_tx_chars(struct uart_8250_port *up);
 160 unsigned int serial8250_modem_status(struct uart_8250_port *up);
 161 void serial8250_init_port(struct uart_8250_port *up);
 162 void serial8250_set_defaults(struct uart_8250_port *up);
 163 void serial8250_console_write(struct uart_8250_port *up, const char *s,
 164                               unsigned int count);
 165 int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
 166
 167 extern void serial8250_set_isa_configurator(void (*v)
 168                                         (int port, struct uart_port *up,
 169                                                 unsigned short *capabilities));
 170
 171 #endif