LXR linux/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
  28struct 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
  51struct 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 */
 109struct 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 */
 143