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[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [drivers/] [keyboard.c] - Blame information for rev 328

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Line No. Rev Author Line
1 2 marcus.erl
#include "common.h"
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#include "board.h"
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#include "support.h"
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#include "int.h"
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#include "keyboard.h"
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#if KBD_ENABLED
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volatile int kbd_tail = 0;
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volatile int kbd_head = 0;
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volatile int kbd_buf[KBDBUF_SIZE];
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static const unsigned char scan2ascii[2][0x40] = {
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 {0x1f, 0x00, '1', '2',  '3', '4', '5', '6',   /* 0x00 */
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  '7', '8', '9', '0',    '-', '=', '\b', '\t',
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  'q', 'w', 'e', 'r',    't', 'y', 'u', 'i',   /* 0x10 */
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  'o', 'p', '[', ']',    '\n', 0x00, 'a', 's',
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  'd', 'f', 'g', 'h',    'j', 'k', 'l', ';',   /* 0x20 */
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  '\'', '`', 0xff, '\\', 'z', 'x', 'c', 'v',
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  'b', 'n', 'm', ',',    '.', '/', 0xff, 0x00, /* 0x30 */
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  0x00, ' ', 0x00, 0x00, 0x00, 0x00,0x00,0x00},
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 {0x00, 0x00, '!', '@',  '#', '$', '%', '^',  /* 0x00 */
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  '&',  '*', '(', ')',   '_', '+', 0x00,0x00,
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  'Q', 'W', 'E', 'R',    'T', 'Y', 'U', 'I',  /* 0X10 */
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  'O', 'P', '{', '}',    '\n', 0x00, 'A', 'S',
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  'D', 'F', 'G', 'H',    'J', 'K', 'L', ':',  /* 0X20 */
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  '"', '~', 0xff, '|',   'Z', 'X', 'C', 'V',
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  'B', 'N', 'M', '<',    '>', '?', 0xff, 0x00,/* 0x30 */
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  0x00, ' ', 0x00, 0x00, 0x00, 0x00,0x00,0x00}};
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static int shift_state = 0;
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static void put_queue(int ch)
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{
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  //putc (ch);
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  debug ("put_queue %c (%i,%i)\n", ch, kbd_head, kbd_tail);
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        kbd_buf[kbd_head] = ch;
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        kbd_head = (kbd_head + 1) % KBDBUF_SIZE;
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}
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static void handle_scancode (unsigned char scan)
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{
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  unsigned char c;
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  if (scan >= 0x40) {
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    scan &= 0x7f;
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    if (scan >= 0x40) return;
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    c = scan2ascii[shift_state][scan];
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    if (c == 0xff) shift_state = 0;
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    return;
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  }
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  c = scan2ascii[shift_state][scan];
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  if (c == 0xff) shift_state = 1;
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  else put_queue (c);
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}
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static void keyboard_interrupt(void)
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{
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        unsigned char status = REG8(KBD_BASE_ADD + 0x4);
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        debug ("keyboard_interrupt\n");
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        do {
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                if (status & 0x01) handle_scancode(REG8(KBD_BASE_ADD + 0x0));
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                status = REG8(KBD_BASE_ADD + 0x4);
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        } while (status & 0x01);
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}
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static int kbd_wait_for_input(void)
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{
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  int     n;
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  int     status, data;
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  n = TIMEOUT_CONST;
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  do {
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    status = REG8(KBD_STATUS_REG);
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     /*
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      * Wait for input data to become available.  This bit will
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      * then be cleared by the following read of the DATA
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      * register.
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      */
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    if (!(status & KBD_OBF)) continue;
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                data = REG8(KBD_DATA_REG);
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    /*
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     * Check to see if a timeout error has occurred.  This means
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     * that transmission was started but did not complete in the
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     * normal time cycle.  PERR is set when a parity error occurred
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     * in the last transmission.
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     */
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    if (status & (KBD_GTO | KBD_PERR)) continue;
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                return (data & 0xff);
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  } while (--n);
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  return (-1);  /* timed-out if fell through to here... */
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}
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static void kbd_write (int address, int data)
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{
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        int status;
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        do {
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                status = REG8(KBD_STATUS_REG);  /* spin until input buffer empty*/
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        } while (status & KBD_IBF);
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  REG8 (address) = data;               /* write out the data*/
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}
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int kbd_init(void)
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{
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        int_add (KBD_IRQ, keyboard_interrupt);
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        /* Flush any pending input. */
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        while (kbd_wait_for_input() != -1) continue;
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        /*
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         * Test the keyboard interface.
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         * This seems to be the only way to get it going.
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         * If the test is successful a x55 is placed in the input buffer.
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         */
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        kbd_write(KBD_CNTL_REG, KBD_SELF_TEST);
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        if (kbd_wait_for_input() != 0x55) {
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                printf ("initialize_kbd: keyboard failed self test.\n");
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                return(-1);
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        }
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        /*
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         * Perform a keyboard interface test.  This causes the controller
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         * to test the keyboard clock and data lines.  The results of the
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         * test are placed in the input buffer.
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         */
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        kbd_write(KBD_CNTL_REG, KBD_SELF_TEST2);
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        if (kbd_wait_for_input() != 0x00) {
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                printf ("initialize_kbd: keyboard failed self test 2.\n");
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                return(-1);
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        }
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        /* Enable the keyboard by allowing the keyboard clock to run. */
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        kbd_write(KBD_CNTL_REG, KBD_CNTL_ENABLE);
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        /*
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         * Reset keyboard. If the read times out
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         * then the assumption is that no keyboard is
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         * plugged into the machine.
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         * This defaults the keyboard to scan-code set 2.
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         */
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        kbd_write(KBD_DATA_REG, KBD_RESET);
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        if (kbd_wait_for_input() != KBD_ACK) {
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                printf ("initialize_kbd: reset kbd failed, no ACK.\n");
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                return(-1);
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        }
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        if (kbd_wait_for_input() != KBD_POR) {
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                printf ("initialize_kbd: reset kbd failed, not POR.\n");
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                return(-1);
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        }
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        /*
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         * now do a DEFAULTS_DISABLE always
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         */
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        kbd_write(KBD_DATA_REG, KBD_DISABLE);
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        if (kbd_wait_for_input() != KBD_ACK) {
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                printf ("initialize_kbd: disable kbd failed, no ACK.\n");
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                return(-1);
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        }
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        /*
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         * Enable keyboard interrupt, operate in "sys" mode,
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         *  enable keyboard (by clearing the disable keyboard bit),
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         *  disable mouse, do conversion of keycodes.
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         */
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        kbd_write(KBD_CNTL_REG, KBD_WRITE_MODE);
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        kbd_write(KBD_DATA_REG, KBD_EKI|KBD_SYS|KBD_DMS|KBD_KCC);
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        /*
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         * now ENABLE the keyboard to set it scanning...
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         */
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        kbd_write(KBD_DATA_REG, KBD_ENABLE);
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        if (kbd_wait_for_input() != KBD_ACK) {
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                printf ("initialize_kbd: keyboard enable failed.\n");
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                return(-1);
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        }
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  int_enable (KBD_IRQ);
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        printf ("PS/2 keyboard initialized at 0x%x (irq = %d).\n", KBD_BASE_ADD, KBD_IRQ);
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        return (1);
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}
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#endif /* KBD_ENABLED */

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