include/linux/serial_8250.h

   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  */
  17 struct 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  */
  48 enum {
  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
  62 struct uart_8250_dma;
  63 struct 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  */
  73 struct uart_8250_ops {
  74         int             (*setup_irq)(struct uart_8250_port *);
  75         void            (*release_irq)(struct uart_8250_port *);
  76 };
  77
  78 struct 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
  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         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
 140 static 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
 145 int serial8250_register_8250_port(struct uart_8250_port *);
 146 void serial8250_unregister_port(int line);
 147 void serial8250_suspend_port(int line);
 148 void serial8250_resume_port(int line);
 149
 150 extern int early_serial_setup(struct uart_port *port);
 151
 152 extern int early_serial8250_setup(struct earlycon_device *device,
 153                                          const char *options);
 154 extern void serial8250_do_set_termios(struct uart_port *port,
 155                 struct ktermios *termios, struct ktermios *old);
 156 extern void serial8250_do_set_ldisc(struct uart_port *port,
 157                                     struct ktermios *termios);
 158 extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
 159 extern int serial8250_do_startup(struct uart_port *port);
 160 extern void serial8250_do_shutdown(struct uart_port *port);
 161 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
 162                              unsigned int oldstate);
 163 extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 164 extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
 165                                       unsigned int quot,
 166                                       unsigned int quot_frac);
 167 extern int fsl8250_handle_irq(struct uart_port *port);
 168 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 169 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
 170 void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
 171 void serial8250_tx_chars(struct uart_8250_port *up);
 172 unsigned int serial8250_modem_status(struct uart_8250_port *up);
 173 void serial8250_init_port(struct uart_8250_port *up);
 174 void serial8250_set_defaults(struct uart_8250_port *up);
 175 void serial8250_console_write(struct uart_8250_port *up, const char *s,
 176                               unsigned int count);
 177 int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
 178
 179 extern void serial8250_set_isa_configurator(void (*v)
 180                                         (int port, struct uart_port *up,
 181                                                 u32 *capabilities));
 182
 183 #endif