LXR uboot/board/mpl/common/kbd.c

   1/*
   2 * (C) Copyright 2001
   3 * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 *
  23 *
  24 * Source partly derived from:
  25 * linux/drivers/char/pc_keyb.c
  26 *
  27 *
  28 */
  29#include <common.h>
  30#include <asm/processor.h>
  31#include <stdio_dev.h>
  32#include "isa.h"
  33#include "kbd.h"
  34
  35
  36unsigned char kbd_read_status(void);
  37unsigned char kbd_read_input(void);
  38void kbd_send_data(unsigned char data);
  39void disable_8259A_irq(unsigned int irq);
  40void enable_8259A_irq(unsigned int irq);
  41
  42/* used only by send_data - set by keyboard_interrupt */
  43
  44
  45#undef KBG_DEBUG
  46
  47#ifdef KBG_DEBUG
  48#define PRINTF(fmt,args...)     printf (fmt ,##args)
  49#else
  50#define PRINTF(fmt,args...)
  51#endif
  52
  53#define KBD_STAT_KOBF           0x01
  54#define KBD_STAT_IBF            0x02
  55#define KBD_STAT_SYS            0x04
  56#define KBD_STAT_CD             0x08
  57#define KBD_STAT_LOCK           0x10
  58#define KBD_STAT_MOBF           0x20
  59#define KBD_STAT_TI_OUT         0x40
  60#define KBD_STAT_PARERR         0x80
  61
  62#define KBD_INIT_TIMEOUT        1000    /* Timeout in ms for initializing the keyboard */
  63#define KBC_TIMEOUT             250     /* Timeout in ms for sending to keyboard controller */
  64#define KBD_TIMEOUT             2000    /* Timeout in ms for keyboard command acknowledge */
  65/*
  66 *      Keyboard Controller Commands
  67 */
  68
  69#define KBD_CCMD_READ_MODE      0x20    /* Read mode bits */
  70#define KBD_CCMD_WRITE_MODE     0x60    /* Write mode bits */
  71#define KBD_CCMD_GET_VERSION    0xA1    /* Get controller version */
  72#define KBD_CCMD_MOUSE_DISABLE  0xA7    /* Disable mouse interface */
  73#define KBD_CCMD_MOUSE_ENABLE   0xA8    /* Enable mouse interface */
  74#define KBD_CCMD_TEST_MOUSE     0xA9    /* Mouse interface test */
  75#define KBD_CCMD_SELF_TEST      0xAA    /* Controller self test */
  76#define KBD_CCMD_KBD_TEST       0xAB    /* Keyboard interface test */
  77#define KBD_CCMD_KBD_DISABLE    0xAD    /* Keyboard interface disable */
  78#define KBD_CCMD_KBD_ENABLE     0xAE    /* Keyboard interface enable */
  79#define KBD_CCMD_WRITE_AUX_OBUF 0xD3    /* Write to output buffer as if
  80                                           initiated by the auxiliary device */
  81#define KBD_CCMD_WRITE_MOUSE    0xD4    /* Write the following byte to the mouse */
  82
  83/*
  84 *      Keyboard Commands
  85 */
  86
  87#define KBD_CMD_SET_LEDS        0xED    /* Set keyboard leds */
  88#define KBD_CMD_SET_RATE        0xF3    /* Set typematic rate */
  89#define KBD_CMD_ENABLE          0xF4    /* Enable scanning */
  90#define KBD_CMD_DISABLE         0xF5    /* Disable scanning */
  91#define KBD_CMD_RESET           0xFF    /* Reset */
  92
  93/*
  94 *      Keyboard Replies
  95 */
  96
  97#define KBD_REPLY_POR           0xAA    /* Power on reset */
  98#define KBD_REPLY_ACK           0xFA    /* Command ACK */
  99#define KBD_REPLY_RESEND        0xFE    /* Command NACK, send the cmd again */
 100
 101/*
 102 *      Status Register Bits
 103 */
 104
 105#define KBD_STAT_OBF            0x01    /* Keyboard output buffer full */
 106#define KBD_STAT_IBF            0x02    /* Keyboard input buffer full */
 107#define KBD_STAT_SELFTEST       0x04    /* Self test successful */
 108#define KBD_STAT_CMD            0x08    /* Last write was a command write (0=data) */
 109#define KBD_STAT_UNLOCKED       0x10    /* Zero if keyboard locked */
 110#define KBD_STAT_MOUSE_OBF      0x20    /* Mouse output buffer full */
 111#define KBD_STAT_GTO            0x40    /* General receive/xmit timeout */
 112#define KBD_STAT_PERR           0x80    /* Parity error */
 113
 114#define AUX_STAT_OBF (KBD_STAT_OBF | KBD_STAT_MOUSE_OBF)
 115
 116/*
 117 *      Controller Mode Register Bits
 118 */
 119
 120#define KBD_MODE_KBD_INT        0x01    /* Keyboard data generate IRQ1 */
 121#define KBD_MODE_MOUSE_INT      0x02    /* Mouse data generate IRQ12 */
 122#define KBD_MODE_SYS            0x04    /* The system flag (?) */
 123#define KBD_MODE_NO_KEYLOCK     0x08    /* The keylock doesn't affect the keyboard if set */
 124#define KBD_MODE_DISABLE_KBD    0x10    /* Disable keyboard interface */
 125#define KBD_MODE_DISABLE_MOUSE  0x20    /* Disable mouse interface */
 126#define KBD_MODE_KCC            0x40    /* Scan code conversion to PC format */
 127#define KBD_MODE_RFU            0x80
 128
 129
 130#define KDB_DATA_PORT           0x60
 131#define KDB_COMMAND_PORT        0x64
 132
 133#define LED_SCR                 0x01    /* scroll lock led */
 134#define LED_CAP                 0x04    /* caps lock led */
 135#define LED_NUM                 0x02    /* num lock led */
 136
 137#define KBD_BUFFER_LEN          0x20    /* size of the keyboardbuffer */
 138
 139
 140static volatile char kbd_buffer[KBD_BUFFER_LEN];
 141static volatile int in_pointer = 0;
 142static volatile int out_pointer = 0;
 143
 144
 145static unsigned char num_lock = 0;
 146static unsigned char caps_lock = 0;
 147static unsigned char scroll_lock = 0;
 148static unsigned char shift = 0;
 149static unsigned char ctrl = 0;
 150static unsigned char alt = 0;
 151static unsigned char e0 = 0;
 152static unsigned char leds = 0;
 153
 154#define DEVNAME "kbd"
 155
 156/* Simple translation table for the keys */
 157
 158static unsigned char kbd_plain_xlate[] = {
 159        0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t',        /* 0x00 - 0x0f */
 160         'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's',        /* 0x10 - 0x1f */
 161         'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v',        /* 0x20 - 0x2f */
 162         'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 163        0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 164         '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 165        '\r',0xff,0xff
 166        };
 167
 168static unsigned char kbd_shift_xlate[] = {
 169        0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t',        /* 0x00 - 0x0f */
 170         'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S',        /* 0x10 - 0x1f */
 171         'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V',        /* 0x20 - 0x2f */
 172         'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 173        0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 174         '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 175        '\r',0xff,0xff
 176        };
 177
 178static unsigned char kbd_ctrl_xlate[] = {
 179        0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t',        /* 0x00 - 0x0f */
 180        0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13,        /* 0x10 - 0x1f */
 181        0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16,        /* 0x20 - 0x2f */
 182        0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 183        0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 184         '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 185        '\r',0xff,0xff
 186        };
 187
 188/******************************************************************
 189 * Init
 190 ******************************************************************/
 191int isa_kbd_init(void)
 192{
 193        char* result;
 194        result=kbd_initialize();
 195        if(result==NULL) {
 196                PRINTF("AT Keyboard initialized\n");
 197                irq_install_handler(25, (interrupt_handler_t *)handle_isa_int, NULL);
 198                isa_irq_install_handler(KBD_INTERRUPT, (interrupt_handler_t *)kbd_interrupt, NULL);
 199                return (1);
 200        } else {
 201                printf("%s\n",result);
 202                return (-1);
 203        }
 204}
 205
 206#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
 207extern int overwrite_console (void);
 208#else
 209int overwrite_console (void)
 210{
 211        return (0);
 212}
 213#endif
 214
 215int drv_isa_kbd_init (void)
 216{
 217        int error;
 218        struct stdio_dev kbddev ;
 219        char *stdinname  = getenv ("stdin");
 220
 221        if(isa_kbd_init()==-1)
 222                return -1;
 223        memset (&kbddev, 0, sizeof(kbddev));
 224        strcpy(kbddev.name, DEVNAME);
 225        kbddev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 226        kbddev.putc = NULL ;
 227        kbddev.puts = NULL ;
 228        kbddev.getc = kbd_getc ;
 229        kbddev.tstc = kbd_testc ;
 230
 231        error = stdio_register (&kbddev);
 232        if(error==0) {
 233                /* check if this is the standard input device */
 234                if(strcmp(stdinname,DEVNAME)==0) {
 235                        /* reassign the console */
 236                        if(overwrite_console()) {
 237                                return 1;
 238                        }
 239                        error=console_assign(stdin,DEVNAME);
 240                        if(error==0)
 241                                return 1;
 242                        else
 243                                return error;
 244                }
 245                return 1;
 246        }
 247        return error;
 248}
 249
 250/******************************************************************
 251 * Queue handling
 252 ******************************************************************/
 253/* puts character in the queue and sets up the in and out pointer */
 254void kbd_put_queue(char data)
 255{
 256        if((in_pointer+1)==KBD_BUFFER_LEN) {
 257                if(out_pointer==0) {
 258                        return; /* buffer full */
 259                } else{
 260                        in_pointer=0;
 261                }
 262        } else {
 263                if((in_pointer+1)==out_pointer)
 264                        return; /* buffer full */
 265                in_pointer++;
 266        }
 267        kbd_buffer[in_pointer]=data;
 268        return;
 269}
 270
 271/* test if a character is in the queue */
 272int kbd_testc(void)
 273{
 274        if(in_pointer==out_pointer)
 275                return(0); /* no data */
 276        else
 277                return(1);
 278}
 279/* gets the character from the queue */
 280int kbd_getc(void)
 281{
 282        char c;
 283        while(in_pointer==out_pointer);
 284        if((out_pointer+1)==KBD_BUFFER_LEN)
 285                out_pointer=0;
 286        else
 287                out_pointer++;
 288        c=kbd_buffer[out_pointer];
 289        return (int)c;
 290
 291}
 292
 293
 294/* set LEDs */
 295
 296void kbd_set_leds(void)
 297{
 298        if(caps_lock==0)
 299                leds&=~LED_CAP; /* switch caps_lock off */
 300        else
 301                leds|=LED_CAP; /* switch on LED */
 302        if(num_lock==0)
 303                leds&=~LED_NUM; /* switch LED off */
 304        else
 305                leds|=LED_NUM;  /* switch on LED */
 306        if(scroll_lock==0)
 307                leds&=~LED_SCR; /* switch LED off */
 308        else
 309                leds|=LED_SCR; /* switch on LED */
 310        kbd_send_data(KBD_CMD_SET_LEDS);
 311        kbd_send_data(leds);
 312}
 313
 314
 315void handle_keyboard_event (unsigned char scancode)
 316{
 317        unsigned char keycode;
 318
 319        /*  Convert scancode to keycode */
 320        PRINTF ("scancode %x\n", scancode);
 321        if (scancode == 0xe0) {
 322                e0 = 1;         /* special charakters */
 323                return;
 324        }
 325        if (e0 == 1) {
 326                e0 = 0;         /* delete flag */
 327                if (!(((scancode & 0x7F) == 0x38) ||    /* the right ctrl key */
 328                      ((scancode & 0x7F) == 0x1D) ||    /* the right alt key */
 329                      ((scancode & 0x7F) == 0x35) ||    /* the right '/' key */
 330                      ((scancode & 0x7F) == 0x1C)))
 331                        /* the right enter key */
 332                        /* we swallow unknown e0 codes */
 333                        return;
 334        }
 335        /* special cntrl keys */
 336        switch (scancode) {
 337        case 0x2A:
 338        case 0x36:              /* shift pressed */
 339                shift = 1;
 340                return;         /* do nothing else */
 341        case 0xAA:
 342        case 0xB6:              /* shift released */
 343                shift = 0;
 344                return;         /* do nothing else */
 345        case 0x38:              /* alt pressed */
 346                alt = 1;
 347                return;         /* do nothing else */
 348        case 0xB8:              /* alt released */
 349                alt = 0;
 350                return;         /* do nothing else */
 351        case 0x1d:              /* ctrl pressed */
 352                ctrl = 1;
 353                return;         /* do nothing else */
 354        case 0x9d:              /* ctrl released */
 355                ctrl = 0;
 356                return;         /* do nothing else */
 357        case 0x46:              /* scrollock pressed */
 358                scroll_lock = ~scroll_lock;
 359                kbd_set_leds ();
 360                return;         /* do nothing else */
 361        case 0x3A:              /* capslock pressed */
 362                caps_lock = ~caps_lock;
 363                kbd_set_leds ();
 364                return;
 365        case 0x45:              /* numlock pressed */
 366                num_lock = ~num_lock;
 367                kbd_set_leds ();
 368                return;
 369        case 0xC6:              /* scroll lock released */
 370        case 0xC5:              /* num lock released */
 371        case 0xBA:              /* caps lock released */
 372                return;         /* just swallow */
 373        }
 374        if ((scancode & 0x80) == 0x80)  /* key released */
 375                return;
 376        /* now, decide which table we need */
 377        if (scancode > (sizeof (kbd_plain_xlate) / sizeof (kbd_plain_xlate[0]))) {      /* scancode not in list */
 378                PRINTF ("unkown scancode %X\n", scancode);
 379                return;         /* swallow it */
 380        }
 381        /* setup plain code first */
 382        keycode = kbd_plain_xlate[scancode];
 383        if (caps_lock == 1) {   /* caps_lock is pressed, overwrite plain code */
 384                if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
 385                        PRINTF ("unkown caps-locked scancode %X\n", scancode);
 386                        return; /* swallow it */
 387                }
 388                keycode = kbd_shift_xlate[scancode];
 389                if (keycode < 'A') {    /* we only want the alphas capital */
 390                        keycode = kbd_plain_xlate[scancode];
 391                }
 392        }
 393        if (shift == 1) {       /* shift overwrites caps_lock */
 394                if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
 395                        PRINTF ("unkown shifted scancode %X\n", scancode);
 396                        return; /* swallow it */
 397                }
 398                keycode = kbd_shift_xlate[scancode];
 399        }
 400        if (ctrl == 1) {        /* ctrl overwrites caps_lock and shift */
 401                if (scancode > (sizeof (kbd_ctrl_xlate) / sizeof (kbd_ctrl_xlate[0]))) {        /* scancode not in list */
 402                        PRINTF ("unkown ctrl scancode %X\n", scancode);
 403                        return; /* swallow it */
 404                }
 405                keycode = kbd_ctrl_xlate[scancode];
 406        }
 407        /* check if valid keycode */
 408        if (keycode == 0xff) {
 409                PRINTF ("unkown scancode %X\n", scancode);
 410                return;         /* swallow unknown codes */
 411        }
 412
 413        kbd_put_queue (keycode);
 414        PRINTF ("%x\n", keycode);
 415}
 416
 417/*
 418 * This reads the keyboard status port, and does the
 419 * appropriate action.
 420 *
 421 */
 422unsigned char handle_kbd_event(void)
 423{
 424        unsigned char status = kbd_read_status();
 425        unsigned int work = 10000;
 426
 427        while ((--work > 0) && (status & KBD_STAT_OBF)) {
 428                unsigned char scancode;
 429
 430                scancode = kbd_read_input();
 431
 432                /* Error bytes must be ignored to make the
 433                   Synaptics touchpads compaq use work */
 434                /* Ignore error bytes */
 435                if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR)))
 436                {
 437                        if (status & KBD_STAT_MOUSE_OBF)
 438                                ; /* not supported: handle_mouse_event(scancode); */
 439                        else
 440                                handle_keyboard_event(scancode);
 441                }
 442                status = kbd_read_status();
 443        }
 444        if (!work)
 445                PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
 446        return status;
 447}
 448
 449
 450/******************************************************************************
 451 * Lowlevel Part of keyboard section
 452 */
 453unsigned char kbd_read_status(void)
 454{
 455        return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT));
 456}
 457
 458unsigned char kbd_read_input(void)
 459{
 460        return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT));
 461}
 462
 463void kbd_write_command(unsigned char cmd)
 464{
 465        out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT,cmd);
 466}
 467
 468void kbd_write_output(unsigned char data)
 469{
 470        out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT, data);
 471}
 472
 473int kbd_read_data(void)
 474{
 475        int val;
 476        unsigned char status;
 477
 478        val = -1;
 479        status = kbd_read_status();
 480        if (status & KBD_STAT_OBF) {
 481                val = kbd_read_input();
 482                if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
 483                        val = -2;
 484        }
 485        return val;
 486}
 487
 488int kbd_wait_for_input(void)
 489{
 490        unsigned long timeout;
 491        int val;
 492
 493        timeout = KBD_TIMEOUT;
 494        val=kbd_read_data();
 495        while(val < 0)
 496        {
 497                if(timeout--==0)
 498                        return -1;
 499                udelay(1000);
 500                val=kbd_read_data();
 501        }
 502        return val;
 503}
 504
 505
 506int kb_wait(void)
 507{
 508        unsigned long timeout = KBC_TIMEOUT * 10;
 509
 510        do {
 511                unsigned char status = handle_kbd_event();
 512                if (!(status & KBD_STAT_IBF))
 513                        return 0; /* ok */
 514                udelay(1000);
 515                timeout--;
 516        } while (timeout);
 517        return 1;
 518}
 519
 520void kbd_write_command_w(int data)
 521{
 522        if(kb_wait())
 523                PRINTF("timeout in kbd_write_command_w\n");
 524        kbd_write_command(data);
 525}
 526
 527void kbd_write_output_w(int data)
 528{
 529        if(kb_wait())
 530                PRINTF("timeout in kbd_write_output_w\n");
 531        kbd_write_output(data);
 532}
 533
 534void kbd_send_data(unsigned char data)
 535{
 536        unsigned char status;
 537        disable_8259A_irq(1); /* disable interrupt */
 538        kbd_write_output_w(data);
 539        status = kbd_wait_for_input();
 540        if (status == KBD_REPLY_ACK)
 541                enable_8259A_irq(1); /* enable interrupt */
 542}
 543
 544
 545char * kbd_initialize(void)
 546{
 547        int status;
 548
 549        in_pointer = 0; /* delete in Buffer */
 550        out_pointer = 0;
 551        /*
 552         * Test the keyboard interface.
 553         * This seems to be the only way to get it going.
 554         * If the test is successful a x55 is placed in the input buffer.
 555         */
 556        kbd_write_command_w(KBD_CCMD_SELF_TEST);
 557        if (kbd_wait_for_input() != 0x55)
 558                return "Kbd:   failed self test";
 559        /*
 560         * Perform a keyboard interface test.  This causes the controller
 561         * to test the keyboard clock and data lines.  The results of the
 562         * test are placed in the input buffer.
 563         */
 564        kbd_write_command_w(KBD_CCMD_KBD_TEST);
 565        if (kbd_wait_for_input() != 0x00)
 566                return "Kbd:   interface failed self test";
 567        /*
 568         * Enable the keyboard by allowing the keyboard clock to run.
 569         */
 570        kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
 571        status = kbd_wait_for_input();
 572        /*
 573         * Reset keyboard. If the read times out
 574         * then the assumption is that no keyboard is
 575         * plugged into the machine.
 576         * This defaults the keyboard to scan-code set 2.
 577         *
 578         * Set up to try again if the keyboard asks for RESEND.
 579         */
 580        do {
 581                kbd_write_output_w(KBD_CMD_RESET);
 582                status = kbd_wait_for_input();
 583                if (status == KBD_REPLY_ACK)
 584                        break;
 585                if (status != KBD_REPLY_RESEND) {
 586                        PRINTF("status: %X\n",status);
 587                        return "Kbd:   reset failed, no ACK";
 588                }
 589        } while (1);
 590        if (kbd_wait_for_input() != KBD_REPLY_POR)
 591                return "Kbd:   reset failed, no POR";
 592
 593        /*
 594         * Set keyboard controller mode. During this, the keyboard should be
 595         * in the disabled state.
 596         *
 597         * Set up to try again if the keyboard asks for RESEND.
 598         */
 599        do {
 600                kbd_write_output_w(KBD_CMD_DISABLE);
 601                status = kbd_wait_for_input();
 602                if (status == KBD_REPLY_ACK)
 603                        break;
 604                if (status != KBD_REPLY_RESEND)
 605                        return "Kbd:   disable keyboard: no ACK";
 606        } while (1);
 607
 608        kbd_write_command_w(KBD_CCMD_WRITE_MODE);
 609        kbd_write_output_w(KBD_MODE_KBD_INT
 610                              | KBD_MODE_SYS
 611                              | KBD_MODE_DISABLE_MOUSE
 612                              | KBD_MODE_KCC);
 613
 614        /* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
 615        kbd_write_command_w(KBD_CCMD_READ_MODE);
 616        if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
 617                /*
 618                 * If the controller does not support conversion,
 619                 * Set the keyboard to scan-code set 1.
 620                 */
 621                kbd_write_output_w(0xF0);
 622                kbd_wait_for_input();
 623                kbd_write_output_w(0x01);
 624                kbd_wait_for_input();
 625        }
 626        kbd_write_output_w(KBD_CMD_ENABLE);
 627        if (kbd_wait_for_input() != KBD_REPLY_ACK)
 628                return "Kbd:   enable keyboard: no ACK";
 629
 630        /*
 631         * Finally, set the typematic rate to maximum.
 632         */
 633        kbd_write_output_w(KBD_CMD_SET_RATE);
 634        if (kbd_wait_for_input() != KBD_REPLY_ACK)
 635                return "Kbd:   Set rate: no ACK";
 636        kbd_write_output_w(0x00);
 637        if (kbd_wait_for_input() != KBD_REPLY_ACK)
 638                return "Kbd:   Set rate: no ACK";
 639        return NULL;
 640}
 641
 642void kbd_interrupt(void)
 643{
 644        handle_kbd_event();
 645}
 646