include/linux/serial.h

/* */
   1 /*
   2  * include/linux/serial.h
   3  *
   4  * Copyright (C) 1992 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 /*
  11  * This is our internal structure for each serial port's state.
  12  * 
  13  * Many fields are paralleled by the structure used by the serial_struct
  14  * structure.
  15  *
  16  * For definitions of the flags field, see tty.h
  17  */
  18 
  19 struct async_struct {
  20         int                     baud_base;
  21         int                     port;
  22         int                     irq;
  23         int                     flags;
  24         int                     type;
  25         struct tty_struct       *tty;
  26         unsigned long           timer;
  27         int                     timeout;
  28         int                     xmit_fifo_size;
  29         int                     custom_divisor;
  30         int                     x_char; /* xon/xoff characater */
  31         int                     event;
  32         int                     line;
  33         struct async_struct     *next_port; /* For the linked list */
  34         struct async_struct     *prev_port;
  35         
  36 };
  37 
  38 /*
  39  * Events are used to schedule things to happen at timer-interrupt
  40  * time, instead of at rs interrupt time.
  41  */
  42 #define RS_EVENT_READ_PROCESS   0
  43 #define RS_EVENT_WRITE_WAKEUP   1
  44 #define RS_EVENT_HUP_PGRP       2
  45 #define RS_EVENT_BREAK_INT      3
  46 #define RS_EVENT_DO_SAK         4
  47 
  48 /*
  49  * These are the UART port assignments, expressed as offsets from the base
  50  * register.  These assignments should hold for any serial port based on
  51  * a 8250, 16450, or 16550(A).
  52  */
  53 #define UART_RX         0       /* In:  Receive buffer (DLAB=0) */
  54 #define UART_TX         0       /* Out: Transmit buffer (DLAB=0) */
  55 #define UART_DLL        0       /* Out: Devisor Latch Low (DLAB=1) */
  56 #define UART_DLM        1       /* Out: Devisor Latch High (DLAB=1) */
  57 #define UART_IER        1       /* Out: Interrupt Enable Register */
  58 #define UART_IIR        2       /* In:  Interrupt ID Register */
  59 #define UART_FCR        2       /* Out: FIFO Control Register */
  60 #define UART_LCR        3       /* Out: Line Control Register */
  61 #define UART_MCR        4       /* Out: Modem Control Register */
  62 #define UART_LSR        5       /* In:  Line Status Register */
  63 #define UART_MSR        6       /* In:  Modem Status Register */
  64 #define UART_SCR        7       /* I/O: Scratch Register */
  65 
  66 /*
  67  * These are the definitions for the FIFO Control Register
  68  */
  69 #define UART_FCR_ENABLE_FIFO    0x01 /* Enable the FIFO */
  70 #define UART_FCR_CLEAR_RCVR     0x02 /* Clear the RCVR FIFO */
  71 #define UART_FCR_CLEAR_XMIT     0x04 /* Clear the XMIT FIFO */
  72 #define UART_FCR_DMA_SELECT     0x08 /* For DMA applications */
  73 #define UART_FCR_TRIGGER_MASK   0xC0 /* Mask for the FIFO trigger range */
  74 #define UART_FCR_TRIGGER_1      0x00 /* Mask for trigger set at 1 */
  75 #define UART_FCR_TRIGGER_4      0x40 /* Mask for trigger set at 4 */
  76 #define UART_FCR_TRIGGER_8      0x80 /* Mask for trigger set at 8 */
  77 #define UART_FCR_TRIGGER_14     0xC0 /* Mask for trigger set at 14 */
  78 
  79 #define UART_FCR_CLEAR_CMD      (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)
  80 #define UART_FCR_SETUP_CMD      (UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8)
  81         
  82 /*
  83  * These are the definitions for the Line Control Register
  84  * 
  85  * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting 
  86  * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
  87  */
  88 #define UART_LCR_DLAB   0x80    /* Devisor latch access bit */
  89 #define UART_LCR_SBC    0x40    /* Set break control */
  90 #define UART_LCR_SPAR   0x20    /* Stick parity (?) */
  91 #define UART_LCR_EPAR   0x10    /* Even paraity select */
  92 #define UART_LCR_PARITY 0x08    /* Parity Enable */
  93 #define UART_LCR_STOP   0x04    /* Stop bits: 0=1 stop bit, 1= 2 stop bits */
  94 #define UART_LCR_WLEN5  0x00    /* Wordlength: 5 bits */
  95 #define UART_LCR_WLEN6  0x01    /* Wordlength: 6 bits */
  96 #define UART_LCR_WLEN7  0x02    /* Wordlength: 7 bits */
  97 #define UART_LCR_WLEN8  0x03    /* Wordlength: 8 bits */
  98 
  99 /*
 100  * These are the definitions for the Line Status Register
 101  */
 102 #define UART_LSR_TEMT   0x40    /* Transmitter empty */
 103 #define UART_LSR_THRE   0x20    /* Transmit-hold-register empty */
 104 #define UART_LSR_BI     0x10    /* Break interrupt indicator */
 105 #define UART_LSR_FE     0x08    /* Frame error indicator */
 106 #define UART_LSR_PE     0x04    /* Parity error indicator */
 107 #define UART_LSR_OE     0x02    /* Overrun error indicator */
 108 #define UART_LSR_DR     0x01    /* Receiver data ready */
 109 
 110 /*
 111  * These are the definitions for the Interrupt Indentification Register
 112  */
 113 #define UART_IIR_NO_INT 0x01    /* No interrupts pending */
 114 #define UART_IIR_ID     0x06    /* Mask for the interrupt ID */
 115 
 116 #define UART_IIR_MSI    0x00    /* Modem status interrupt */
 117 #define UART_IIR_THRI   0x02    /* Transmitter holding register empty */
 118 #define UART_IIR_RDI    0x04    /* Receiver data interrupt */
 119 #define UART_IIR_RLSI   0x06    /* Receiver line status interrupt */
 120 
 121 /*
 122  * These are the definitions for the Interrupt Enable Register
 123  */
 124 #define UART_IER_MSI    0x08    /* Enable Modem status interrupt */
 125 #define UART_IER_RLSI   0x04    /* Enable receiver line status interrupt */
 126 #define UART_IER_THRI   0x02    /* Enable Transmitter holding register int. */
 127 #define UART_IER_RDI    0x01    /* Enable receiver data interrupt */
 128 
 129 /*
 130  * These are the definitions for the Modem Control Register
 131  */
 132 #define UART_MCR_LOOP   0x10    /* Enable loopback test mode */
 133 #define UART_MCR_OUT2   0x08    /* Out2 complement */
 134 #define UART_MCR_OUT1   0x04    /* Out1 complement */
 135 #define UART_MCR_RTS    0x02    /* RTS complement */
 136 #define UART_MCR_DTR    0x01    /* DTR complement */
 137 
 138 /*
 139  * These are the definitions for the Modem Status Register
 140  */
 141 #define UART_MSR_DCD    0x80    /* Data Carrier Detect */
 142 #define UART_MSR_RI     0x40    /* Ring Indicator */
 143 #define UART_MSR_DSR    0x20    /* Data Set Ready */
 144 #define UART_MSR_CTS    0x10    /* Clear to Send */
 145 #define UART_MSR_DDCD   0x08    /* Delta DCD */
 146 #define UART_MSR_TERI   0x04    /* Trailing edge ring indicator */
 147 #define UART_MSR_DDSR   0x02    /* Delta DSR */
 148 #define UART_MSR_DCTS   0x01    /* Delta CTS */
 149 #define UART_MSR_ANY_DELTA 0x0F /* Any of the delta bits! */
/* */
root/include/linux/serial.h

INCLUDED FROM
