release/src-rt-6.x.4708/cfe/cfe/arch/mips/board/p5064/include/i8254.h

   1 /*
   2  * i8254.h: definitions for i8254 programmable interval timer in P5064
   3  * Copyright (c) 1997  Algorithmics Ltd
   4  */
   5
   6 /* Timer 0 is clock interrupt (irq0)
   7  * Timer 1 is refresh clock
   8  * Timer 2 is speaker tone
   9  */
  10
  11 #define PT_CLOCK        0
  12 #define PT_REFRESH      1
  13 #define PT_SPEAKER      2
  14 #define PT_CONTROL      3
  15
  16 #ifndef __ASSEMBLER__
  17 struct i8254 {
  18         unsigned char   pt_counter0;
  19         unsigned char   pt_counter1;
  20         unsigned char   pt_counter2;
  21         unsigned char   pt_control;
  22 };
  23
  24 #define pt_clock        pt_counter0
  25 #define pt_refresh      pt_counter1
  26 #define pt_speaker      pt_counter2
  27
  28 #else
  29
  30 #define PT_REG(x)       (x)
  31
  32 #endif
  33
  34 /*
  35  * control word definitions
  36  */
  37 #define PTCW_RBCMD      (3<<6)          /* read-back command */
  38  #define  PTCW_RB_NCNT   0x20              /* rb: no count */
  39  #define  PTCW_RB_NSTAT  0x10              /* rb: no status */
  40  #define  PTCW_RB_SC(x)  (0x02<<(x))       /* rb: select counter x */
  41 #define PTCW_SC(x)      ((x)<<6)        /* select counter x */
  42 #define PTCW_CLCMD      (0<<4)          /* counter latch command */
  43 #define PTCW_LSB        (1<<4)          /* r/w least signif. byte only */
  44 #define PTCW_MSB        (2<<4)          /* r/w most signif. byte only */
  45 #define PTCW_16B        (3<<4)          /* r/w 16 bits, lsb then msb */
  46 #define PTCW_MODE(x)    ((x)<<1)        /* set mode to x */
  47 #define PTCW_BCD        0x1             /* operate in BCD mode */
  48
  49 /*
  50  * Status word definitions
  51  */
  52 #define PTSW_OUTPUT     0x80            /* output pin active */
  53 #define PTSW_NULL       0x40            /* null count */
  54
  55 /*
  56  * Mode definitions
  57  */
  58 #define MODE_ITC        0               /* interrupt on terminal count */
  59 #define MODE_HROS       1               /* hw retriggerable one-shot */
  60 #define MODE_RG         2               /* rate generator */
  61 #define MODE_SQW        3               /* square wave generator */
  62 #define MODE_STS        4               /* software triggered strobe */
  63 #define MODE_HTS        5               /* hardware triggered strobe */
  64
  65 #define PT_CRYSTAL      14318180        /* timer crystal hz (ticks/sec) */