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         unsigned char   has_sysrq;      /* supports magic SysRq */
  29         upf_t           flags;          /* UPF_* flags */
  30         unsigned int    type;           /* If UPF_FIXED_TYPE */
  31         unsigned int    (*serial_in)(struct uart_port *, int);
  32         void            (*serial_out)(struct uart_port *, int, int);
  33         void            (*set_termios)(struct uart_port *,
  34                                        struct ktermios *new,
  35                                        struct ktermios *old);
  36         void            (*set_ldisc)(struct uart_port *,
  37                                      struct ktermios *);
  38         unsigned int    (*get_mctrl)(struct uart_port *);
  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 hrtimer          start_tx_timer; /* "rs485 start tx" timer */
  81         struct hrtimer          stop_tx_timer;  /* "rs485 stop tx" timer */
  82         struct hrtimer          *active_timer;  /* pointer to active timer */
  83         struct uart_8250_port   *port;          /* for hrtimer callbacks */
  84         unsigned int            tx_stopped:1;   /* tx is currently stopped */
  85 };
  86
  87 /*
  88  * This should be used by drivers which want to register
  89  * their own 8250 ports without registering their own
  90  * platform device.  Using these will make your driver
  91  * dependent on the 8250 driver.
  92  */
  93
  94 struct uart_8250_port {
  95         struct uart_port        port;
  96         struct timer_list       timer;          /* "no irq" timer */
  97         struct list_head        list;           /* ports on this IRQ */
  98         u32                     capabilities;   /* port capabilities */
  99         unsigned short          bugs;           /* port bugs */
 100         bool                    fifo_bug;       /* min RX trigger if enabled */
 101         unsigned int            tx_loadsz;      /* transmit fifo load size */
 102         unsigned char           acr;
 103         unsigned char           fcr;
 104         unsigned char           ier;
 105         unsigned char           lcr;
 106         unsigned char           mcr;
 107         unsigned char           mcr_mask;       /* mask of user bits */
 108         unsigned char           mcr_force;      /* mask of forced bits */
 109         unsigned char           cur_iotype;     /* Running I/O type */
 110         unsigned int            rpm_tx_active;
 111         unsigned char           canary;         /* non-zero during system sleep
 112                                                  *   if no_console_suspend
 113                                                  */
 114         unsigned char           probe;
 115         struct mctrl_gpios      *gpios;
 116 #define UART_PROBE_RSA  (1 << 0)
 117
 118         /*
 119          * Some bits in registers are cleared on a read, so they must
 120          * be saved whenever the register is read but the bits will not
 121          * be immediately processed.
 122          */
 123 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
 124         unsigned char           lsr_saved_flags;
 125 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
 126         unsigned char           msr_saved_flags;
 127
 128         struct uart_8250_dma    *dma;
 129         const struct uart_8250_ops *ops;
 130
 131         /* 8250 specific callbacks */
 132         int                     (*dl_read)(struct uart_8250_port *);
 133         void                    (*dl_write)(struct uart_8250_port *, int);
 134
 135         struct uart_8250_em485 *em485;
 136         void                    (*rs485_start_tx)(struct uart_8250_port *);
 137         void                    (*rs485_stop_tx)(struct uart_8250_port *);
 138
 139         /* Serial port overrun backoff */
 140         struct delayed_work overrun_backoff;
 141         u32 overrun_backoff_time_ms;
 142 };
 143
 144 static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
 145 {
 146         return container_of(up, struct uart_8250_port, port);
 147 }
 148
 149 int serial8250_register_8250_port(const struct uart_8250_port *);
 150 void serial8250_unregister_port(int line);
 151 void serial8250_suspend_port(int line);
 152 void serial8250_resume_port(int line);
 153
 154 extern int early_serial_setup(struct uart_port *port);
 155
 156 extern int early_serial8250_setup(struct earlycon_device *device,
 157                                          const char *options);
 158 extern void serial8250_update_uartclk(struct uart_port *port,
 159                                       unsigned int uartclk);
 160 extern void serial8250_do_set_termios(struct uart_port *port,
 161                 struct ktermios *termios, struct ktermios *old);
 162 extern void serial8250_do_set_ldisc(struct uart_port *port,
 163                                     struct ktermios *termios);
 164 extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
 165 extern int serial8250_do_startup(struct uart_port *port);
 166 extern void serial8250_do_shutdown(struct uart_port *port);
 167 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
 168                              unsigned int oldstate);
 169 extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 170 extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
 171                                       unsigned int quot,
 172                                       unsigned int quot_frac);
 173 extern int fsl8250_handle_irq(struct uart_port *port);
 174 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 175 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
 176 void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
 177 void serial8250_tx_chars(struct uart_8250_port *up);
 178 unsigned int serial8250_modem_status(struct uart_8250_port *up);
 179 void serial8250_init_port(struct uart_8250_port *up);
 180 void serial8250_set_defaults(struct uart_8250_port *up);
 181 void serial8250_console_write(struct uart_8250_port *up, const char *s,
 182                               unsigned int count);
 183 int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
 184 int serial8250_console_exit(struct uart_port *port);
 185
 186 extern void serial8250_set_isa_configurator(void (*v)
 187                                         (int port, struct uart_port *up,
 188                                                 u32 *capabilities));
 189
 190 #ifdef CONFIG_SERIAL_8250_RT288X
 191 unsigned int au_serial_in(struct uart_port *p, int offset);
 192 void au_serial_out(struct uart_port *p, int offset, int value);
 193 #endif
 194
 195 #endif