LCOV - code coverage report
Current view: top level - include/linux - serial_8250.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 2 2 100.0 %
Date: 2022-04-01 14:17:54 Functions: 0 0 -
Branches: 10 40 25.0 %

           Branch data     Line data    Source code
       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                 :            : };
      85                 :            : 
      86                 :            : /*
      87                 :            :  * This should be used by drivers which want to register
      88                 :            :  * their own 8250 ports without registering their own
      89                 :            :  * platform device.  Using these will make your driver
      90                 :            :  * dependent on the 8250 driver.
      91                 :            :  */
      92                 :            : 
      93                 :            : struct uart_8250_port {
      94                 :            :         struct uart_port        port;
      95                 :            :         struct timer_list       timer;          /* "no irq" timer */
      96                 :            :         struct list_head        list;           /* ports on this IRQ */
      97                 :            :         u32                     capabilities;   /* port capabilities */
      98                 :            :         unsigned short          bugs;           /* port bugs */
      99                 :            :         bool                    fifo_bug;       /* min RX trigger if enabled */
     100                 :            :         unsigned int            tx_loadsz;      /* transmit fifo load size */
     101                 :            :         unsigned char           acr;
     102                 :            :         unsigned char           fcr;
     103                 :            :         unsigned char           ier;
     104                 :            :         unsigned char           lcr;
     105                 :            :         unsigned char           mcr;
     106                 :            :         unsigned char           mcr_mask;       /* mask of user bits */
     107                 :            :         unsigned char           mcr_force;      /* mask of forced bits */
     108                 :            :         unsigned char           cur_iotype;     /* Running I/O type */
     109                 :            :         unsigned int            rpm_tx_active;
     110                 :            :         unsigned char           canary;         /* non-zero during system sleep
     111                 :            :                                                  *   if no_console_suspend
     112                 :            :                                                  */
     113                 :            :         unsigned char           probe;
     114                 :            :         struct mctrl_gpios      *gpios;
     115                 :            : #define UART_PROBE_RSA  (1 << 0)
     116                 :            : 
     117                 :            :         /*
     118                 :            :          * Some bits in registers are cleared on a read, so they must
     119                 :            :          * be saved whenever the register is read but the bits will not
     120                 :            :          * be immediately processed.
     121                 :            :          */
     122                 :            : #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
     123                 :            :         unsigned char           lsr_saved_flags;
     124                 :            : #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
     125                 :            :         unsigned char           msr_saved_flags;
     126                 :            : 
     127                 :            :         struct uart_8250_dma    *dma;
     128                 :            :         const struct uart_8250_ops *ops;
     129                 :            : 
     130                 :            :         /* 8250 specific callbacks */
     131                 :            :         int                     (*dl_read)(struct uart_8250_port *);
     132                 :            :         void                    (*dl_write)(struct uart_8250_port *, int);
     133                 :            : 
     134                 :            :         struct uart_8250_em485 *em485;
     135                 :            : 
     136                 :            :         /* Serial port overrun backoff */
     137                 :            :         struct delayed_work overrun_backoff;
     138                 :            :         u32 overrun_backoff_time_ms;
     139                 :            : };
     140                 :            : 
     141                 :     302872 : static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
     142                 :            : {
     143   [ -  -  -  +  :     302872 :         return container_of(up, struct uart_8250_port, port);
          -  -  -  +  -  
          +  -  -  -  +  
          -  -  -  -  -  
          +  -  +  +  +  
          -  -  -  -  -  
          +  -  -  -  -  
          -  -  -  -  -  
                      + ]
     144                 :            : }
     145                 :            : 
     146                 :            : int serial8250_register_8250_port(struct uart_8250_port *);
     147                 :            : void serial8250_unregister_port(int line);
     148                 :            : void serial8250_suspend_port(int line);
     149                 :            : void serial8250_resume_port(int line);
     150                 :            : 
     151                 :            : extern int early_serial_setup(struct uart_port *port);
     152                 :            : 
     153                 :            : extern int early_serial8250_setup(struct earlycon_device *device,
     154                 :            :                                          const char *options);
     155                 :            : extern void serial8250_do_set_termios(struct uart_port *port,
     156                 :            :                 struct ktermios *termios, struct ktermios *old);
     157                 :            : extern void serial8250_do_set_ldisc(struct uart_port *port,
     158                 :            :                                     struct ktermios *termios);
     159                 :            : extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
     160                 :            : extern int serial8250_do_startup(struct uart_port *port);
     161                 :            : extern void serial8250_do_shutdown(struct uart_port *port);
     162                 :            : extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
     163                 :            :                              unsigned int oldstate);
     164                 :            : extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
     165                 :            : extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
     166                 :            :                                       unsigned int quot,
     167                 :            :                                       unsigned int quot_frac);
     168                 :            : extern int fsl8250_handle_irq(struct uart_port *port);
     169                 :            : int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
     170                 :            : unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
     171                 :            : void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
     172                 :            : void serial8250_tx_chars(struct uart_8250_port *up);
     173                 :            : unsigned int serial8250_modem_status(struct uart_8250_port *up);
     174                 :            : void serial8250_init_port(struct uart_8250_port *up);
     175                 :            : void serial8250_set_defaults(struct uart_8250_port *up);
     176                 :            : void serial8250_console_write(struct uart_8250_port *up, const char *s,
     177                 :            :                               unsigned int count);
     178                 :            : int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
     179                 :            : 
     180                 :            : extern void serial8250_set_isa_configurator(void (*v)
     181                 :            :                                         (int port, struct uart_port *up,
     182                 :            :                                                 u32 *capabilities));
     183                 :            : 
     184                 :            : #endif

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