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#include "common.h"

#include "board.h"

#include "support.h"

#include "int.h"

#include "keyboard.h"

#if KBD_ENABLED

volatile int kbd_tail = 0;

volatile int kbd_head = 0;

volatile int kbd_buf[KBDBUF_SIZE];

static const unsigned char scan2ascii[2][0x40] = {

 {0x1f, 0x00, '1', '2',  '3', '4', '5', '6',   /* 0x00 */

  '7', '8', '9', '0',    '-', '=', '\b', '\t',

  'q', 'w', 'e', 'r',    't', 'y', 'u', 'i',   /* 0x10 */

  'o', 'p', '[', ']',    '\n', 0x00, 'a', 's',

  'd', 'f', 'g', 'h',    'j', 'k', 'l', ';',   /* 0x20 */

  '\'', '`', 0xff, '\\', 'z', 'x', 'c', 'v',

  'b', 'n', 'm', ',',    '.', '/', 0xff, 0x00, /* 0x30 */

  0x00, ' ', 0x00, 0x00, 0x00, 0x00,0x00,0x00},

 {0x00, 0x00, '!', '@',  '#', '$', '%', '^',  /* 0x00 */

  '&',  '*', '(', ')',   '_', '+', 0x00,0x00,

  'Q', 'W', 'E', 'R',    'T', 'Y', 'U', 'I',  /* 0X10 */

  'O', 'P', '{', '}',    '\n', 0x00, 'A', 'S',

  'D', 'F', 'G', 'H',    'J', 'K', 'L', ':',  /* 0X20 */

  '"', '~', 0xff, '|',   'Z', 'X', 'C', 'V',

  'B', 'N', 'M', '<',    '>', '?', 0xff, 0x00,/* 0x30 */

  0x00, ' ', 0x00, 0x00, 0x00, 0x00,0x00,0x00}};

static int shift_state = 0;

static void put_queue(int ch)

{

  //putc (ch);

  debug ("put_queue %c (%i,%i)\n", ch, kbd_head, kbd_tail);

        kbd_buf[kbd_head] = ch;

        kbd_head = (kbd_head + 1) % KBDBUF_SIZE;

}

static void handle_scancode (unsigned char scan)

{

  unsigned char c;

  if (scan >= 0x40) {

    scan &= 0x7f;

    if (scan >= 0x40) return;

    c = scan2ascii[shift_state][scan];

    if (c == 0xff) shift_state = 0;

    return;

  }

  c = scan2ascii[shift_state][scan];

  if (c == 0xff) shift_state = 1;

  else put_queue (c);

}

static void keyboard_interrupt(void)

{

        unsigned char status = REG8(KBD_BASE_ADD + 0x4);

        debug ("keyboard_interrupt\n");

        do {

                if (status & 0x01) handle_scancode(REG8(KBD_BASE_ADD + 0x0));

                status = REG8(KBD_BASE_ADD + 0x4);

        } while (status & 0x01);

}

static int kbd_wait_for_input(void)

{

  int     n;

  int     status, data;

  n = TIMEOUT_CONST;

  do {

    status = REG8(KBD_STATUS_REG);

     /*

      * Wait for input data to become available.  This bit will

      * then be cleared by the following read of the DATA

      * register.

      */

    if (!(status & KBD_OBF)) continue;

                data = REG8(KBD_DATA_REG);

    /*

     * Check to see if a timeout error has occurred.  This means

     * that transmission was started but did not complete in the

     * normal time cycle.  PERR is set when a parity error occurred

     * in the last transmission.

     */

    if (status & (KBD_GTO | KBD_PERR)) continue;

                return (data & 0xff);

  } while (--n);

  return (-1);  /* timed-out if fell through to here... */

}

static void kbd_write (int address, int data)

{

        int status;

        do {

                status = REG8(KBD_STATUS_REG);  /* spin until input buffer empty*/

        } while (status & KBD_IBF);

  REG8 (address) = data;               /* write out the data*/

}

int kbd_init(void)

{

        int_add (KBD_IRQ, keyboard_interrupt);

        /* Flush any pending input. */

        while (kbd_wait_for_input() != -1) continue;

        /*

         * Test the keyboard interface.

         * This seems to be the only way to get it going.

         * If the test is successful a x55 is placed in the input buffer.

         */

        kbd_write(KBD_CNTL_REG, KBD_SELF_TEST);

        if (kbd_wait_for_input() != 0x55) {

                printf ("initialize_kbd: keyboard failed self test.\n");

                return(-1);

        }

        /*

         * Perform a keyboard interface test.  This causes the controller

         * to test the keyboard clock and data lines.  The results of the

         * test are placed in the input buffer.

         */

        kbd_write(KBD_CNTL_REG, KBD_SELF_TEST2);

        if (kbd_wait_for_input() != 0x00) {

                printf ("initialize_kbd: keyboard failed self test 2.\n");

                return(-1);

        }

        /* Enable the keyboard by allowing the keyboard clock to run. */

        kbd_write(KBD_CNTL_REG, KBD_CNTL_ENABLE);

        /*

         * Reset keyboard. If the read times out

         * then the assumption is that no keyboard is

         * plugged into the machine.

         * This defaults the keyboard to scan-code set 2.

         */

        kbd_write(KBD_DATA_REG, KBD_RESET);

        if (kbd_wait_for_input() != KBD_ACK) {

                printf ("initialize_kbd: reset kbd failed, no ACK.\n");

                return(-1);

        }

        if (kbd_wait_for_input() != KBD_POR) {

                printf ("initialize_kbd: reset kbd failed, not POR.\n");

                return(-1);

        }

        /*

         * now do a DEFAULTS_DISABLE always

         */

        kbd_write(KBD_DATA_REG, KBD_DISABLE);

        if (kbd_wait_for_input() != KBD_ACK) {

                printf ("initialize_kbd: disable kbd failed, no ACK.\n");

                return(-1);

        }

        /*

         * Enable keyboard interrupt, operate in "sys" mode,

         *  enable keyboard (by clearing the disable keyboard bit),

         *  disable mouse, do conversion of keycodes.

         */

        kbd_write(KBD_CNTL_REG, KBD_WRITE_MODE);

        kbd_write(KBD_DATA_REG, KBD_EKI|KBD_SYS|KBD_DMS|KBD_KCC);

        /*

         * now ENABLE the keyboard to set it scanning...

         */

        kbd_write(KBD_DATA_REG, KBD_ENABLE);

        if (kbd_wait_for_input() != KBD_ACK) {

                printf ("initialize_kbd: keyboard enable failed.\n");

                return(-1);

        }

  int_enable (KBD_IRQ);

        printf ("PS/2 keyboard initialized at 0x%x (irq = %d).\n", KBD_BASE_ADD, KBD_IRQ);

        return (1);

}

#endif /* KBD_ENABLED */