include/linux/serialP.h

   1 /*
   2  * Private header file for the (dumb) serial driver
   3  *
   4  * Copyright (C) 1997 by Theodore Ts'o.
   5  *
   6  * Redistribution of this file is permitted under the terms of the GNU
   7  * Public License (GPL)
   8  */
   9
  10 #ifndef _LINUX_SERIALP_H
  11 #define _LINUX_SERIALP_H
  12
  13 /*
  14  * This is our internal structure for each serial port's state.
  15  *
  16  * Many fields are paralleled by the structure used by the serial_struct
  17  * structure.
  18  *
  19  * For definitions of the flags field, see tty.h
  20  */
  21
  22 #include <linux/termios.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/circ_buf.h>
  26 #include <linux/wait.h>
  27
  28 struct serial_state {
  29         int     magic;
  30         int     baud_base;
  31         unsigned long   port;
  32         int     irq;
  33         int     flags;
  34         int     hub6;
  35         int     type;
  36         int     line;
  37         int     revision;       /* Chip revision (950) */
  38         int     xmit_fifo_size;
  39         int     custom_divisor;
  40         int     count;
  41         u8      *iomem_base;
  42         u16     iomem_reg_shift;
  43         unsigned short  close_delay;
  44         unsigned short  closing_wait; /* time to wait before closing */
  45         struct async_icount     icount;
  46         int     io_type;
  47         struct async_struct *info;
  48         struct pci_dev  *dev;
  49 };
  50
  51 struct async_struct {
  52         int                     magic;
  53         unsigned long           port;
  54         int                     hub6;
  55         int                     flags;
  56         int                     xmit_fifo_size;
  57         struct serial_state     *state;
  58         struct tty_struct       *tty;
  59         int                     read_status_mask;
  60         int                     ignore_status_mask;
  61         int                     timeout;
  62         int                     quot;
  63         int                     x_char; /* xon/xoff character */
  64         int                     close_delay;
  65         unsigned short          closing_wait;
  66         unsigned short          closing_wait2; /* obsolete */
  67         int                     IER;    /* Interrupt Enable Register */
  68         int                     MCR;    /* Modem control register */
  69         int                     LCR;    /* Line control register */
  70         int                     ACR;     /* 16950 Additional Control Reg. */
  71         unsigned long           event;
  72         unsigned long           last_active;
  73         int                     line;
  74         int                     blocked_open; /* # of blocked opens */
  75         struct circ_buf         xmit;
  76         spinlock_t              xmit_lock;
  77         u8                      *iomem_base;
  78         u16                     iomem_reg_shift;
  79         int                     io_type;
  80         struct work_struct                      work;
  81         struct tasklet_struct   tlet;
  82 #ifdef DECLARE_WAITQUEUE
  83         wait_queue_head_t       open_wait;
  84         wait_queue_head_t       close_wait;
  85         wait_queue_head_t       delta_msr_wait;
  86 #else
  87         struct wait_queue       *open_wait;
  88         struct wait_queue       *close_wait;
  89         struct wait_queue       *delta_msr_wait;
  90 #endif
  91         struct async_struct     *next_port; /* For the linked list */
  92         struct async_struct     *prev_port;
  93 };
  94
  95 #define CONFIGURED_SERIAL_PORT(info) ((info)->port || ((info)->iomem_base))
  96
  97 #define SERIAL_MAGIC 0x5301
  98 #define SSTATE_MAGIC 0x5302
  99
 100 /*
 101  * Events are used to schedule things to happen at timer-interrupt
 102  * time, instead of at rs interrupt time.
 103  */
 104 #define RS_EVENT_WRITE_WAKEUP   0
 105
 106 /*
 107  * Multiport serial configuration structure --- internal structure
 108  */
 109 struct rs_multiport_struct {
 110         int             port1;
 111         unsigned char   mask1, match1;
 112         int             port2;
 113         unsigned char   mask2, match2;
 114         int             port3;
 115         unsigned char   mask3, match3;
 116         int             port4;
 117         unsigned char   mask4, match4;
 118         int             port_monitor;
 119 };
 120
 121 #if defined(__alpha__) && !defined(CONFIG_PCI)
 122 /*
 123  * Digital did something really horribly wrong with the OUT1 and OUT2
 124  * lines on at least some ALPHA's.  The failure mode is that if either
 125  * is cleared, the machine locks up with endless interrupts.
 126  *
 127  * This is still used by arch/mips/au1000/common/serial.c for some weird
 128  * reason (mips != alpha!)
 129  */
 130 #define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 131 #elif defined(CONFIG_SBC8560)
 132 /*
 133  * WindRiver did something similarly broken on their SBC8560 board. The
 134  * UART tristates its IRQ output while OUT2 is clear, but they pulled
 135  * the interrupt line _up_ instead of down, so if we register the IRQ
 136  * while the UART is in that state, we die in an IRQ storm. */
 137 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
 138 #else
 139 #define ALPHA_KLUDGE_MCR 0
 140 #endif
 141
 142 #endif /* _LINUX_SERIAL_H */