compiler/include/hardware/pit.h

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: IBM PC-compatible PIT (8253) specific definitions
   6     Lang: english
   7 */
   8
   9 #ifndef HARDWARE_PIT_H
  10 #define HARDWARE_PIT_H
  11
  12 #include <asm/io.h>
  13
  14 #define PIT_CH0     0x40
  15 #define PIT_CH1     0x41 /* This channel is likely missing */
  16 #define PIT_CH2     0x42
  17 #define PIT_CONTROL 0x43
  18
  19 #define BCD             0x01    /* BCD flag              */
  20 #define MODE_TERMINAL   0x00    /* Channel mode          */
  21 #define MODE_ONESHOT    0x02
  22 #define MODE_RATE       0x04
  23 #define MODE_SQUARE     0x06
  24 #define MODE_SW_STROBE  0x08
  25 #define MODE_HW_STROBE  0x0A
  26 #define ACCESS_LATCH    0x00    /* 'Latch value' command */
  27 #define ACCESS_LOW      0x10    /* Access mode           */
  28 #define ACCESS_HI       0x20
  29 #define ACCESS_FULL     0x30
  30 #define CH0             0x00    /* Channel selector      */
  31 #define CH1             0x40
  32 #define CH2             0x80
  33 #define READBACK        0xC0
  34
  35 /* Two useful macros for accessing counter values */
  36 #define ch_read(port) inb(port) | (inb(port) << 8)
  37 #define ch_write(val, port) outb((val) & 0xff, port); outb(((val) >> 8) & 0xff, port)
  38
  39 #endif