board/mpl/common/kbd.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Source partly derived from:
   8  * linux/drivers/char/pc_keyb.c
   9  */
  10 #include <common.h>
  11 #include <asm/processor.h>
  12 #include <stdio_dev.h>
  13 #include "isa.h"
  14 #include "kbd.h"
  15
  16
  17 unsigned char kbd_read_status(void);
  18 unsigned char kbd_read_input(void);
  19 void kbd_send_data(unsigned char data);
  20 void disable_8259A_irq(unsigned int irq);
  21 void enable_8259A_irq(unsigned int irq);
  22
  23 /* used only by send_data - set by keyboard_interrupt */
  24
  25
  26 #undef KBG_DEBUG
  27
  28 #ifdef KBG_DEBUG
  29 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  30 #else
  31 #define PRINTF(fmt,args...)
  32 #endif
  33
  34 #define KBD_STAT_KOBF           0x01
  35 #define KBD_STAT_IBF            0x02
  36 #define KBD_STAT_SYS            0x04
  37 #define KBD_STAT_CD             0x08
  38 #define KBD_STAT_LOCK           0x10
  39 #define KBD_STAT_MOBF           0x20
  40 #define KBD_STAT_TI_OUT         0x40
  41 #define KBD_STAT_PARERR         0x80
  42
  43 #define KBD_INIT_TIMEOUT        1000    /* Timeout in ms for initializing the keyboard */
  44 #define KBC_TIMEOUT             250     /* Timeout in ms for sending to keyboard controller */
  45 #define KBD_TIMEOUT             2000    /* Timeout in ms for keyboard command acknowledge */
  46 /*
  47  *      Keyboard Controller Commands
  48  */
  49
  50 #define KBD_CCMD_READ_MODE      0x20    /* Read mode bits */
  51 #define KBD_CCMD_WRITE_MODE     0x60    /* Write mode bits */
  52 #define KBD_CCMD_GET_VERSION    0xA1    /* Get controller version */
  53 #define KBD_CCMD_MOUSE_DISABLE  0xA7    /* Disable mouse interface */
  54 #define KBD_CCMD_MOUSE_ENABLE   0xA8    /* Enable mouse interface */
  55 #define KBD_CCMD_TEST_MOUSE     0xA9    /* Mouse interface test */
  56 #define KBD_CCMD_SELF_TEST      0xAA    /* Controller self test */
  57 #define KBD_CCMD_KBD_TEST       0xAB    /* Keyboard interface test */
  58 #define KBD_CCMD_KBD_DISABLE    0xAD    /* Keyboard interface disable */
  59 #define KBD_CCMD_KBD_ENABLE     0xAE    /* Keyboard interface enable */
  60 #define KBD_CCMD_WRITE_AUX_OBUF 0xD3    /* Write to output buffer as if
  61                                            initiated by the auxiliary device */
  62 #define KBD_CCMD_WRITE_MOUSE    0xD4    /* Write the following byte to the mouse */
  63
  64 /*
  65  *      Keyboard Commands
  66  */
  67
  68 #define KBD_CMD_SET_LEDS        0xED    /* Set keyboard leds */
  69 #define KBD_CMD_SET_RATE        0xF3    /* Set typematic rate */
  70 #define KBD_CMD_ENABLE          0xF4    /* Enable scanning */
  71 #define KBD_CMD_DISABLE         0xF5    /* Disable scanning */
  72 #define KBD_CMD_RESET           0xFF    /* Reset */
  73
  74 /*
  75  *      Keyboard Replies
  76  */
  77
  78 #define KBD_REPLY_POR           0xAA    /* Power on reset */
  79 #define KBD_REPLY_ACK           0xFA    /* Command ACK */
  80 #define KBD_REPLY_RESEND        0xFE    /* Command NACK, send the cmd again */
  81
  82 /*
  83  *      Status Register Bits
  84  */
  85
  86 #define KBD_STAT_OBF            0x01    /* Keyboard output buffer full */
  87 #define KBD_STAT_IBF            0x02    /* Keyboard input buffer full */
  88 #define KBD_STAT_SELFTEST       0x04    /* Self test successful */
  89 #define KBD_STAT_CMD            0x08    /* Last write was a command write (0=data) */
  90 #define KBD_STAT_UNLOCKED       0x10    /* Zero if keyboard locked */
  91 #define KBD_STAT_MOUSE_OBF      0x20    /* Mouse output buffer full */
  92 #define KBD_STAT_GTO            0x40    /* General receive/xmit timeout */
  93 #define KBD_STAT_PERR           0x80    /* Parity error */
  94
  95 #define AUX_STAT_OBF (KBD_STAT_OBF | KBD_STAT_MOUSE_OBF)
  96
  97 /*
  98  *      Controller Mode Register Bits
  99  */
 100
 101 #define KBD_MODE_KBD_INT        0x01    /* Keyboard data generate IRQ1 */
 102 #define KBD_MODE_MOUSE_INT      0x02    /* Mouse data generate IRQ12 */
 103 #define KBD_MODE_SYS            0x04    /* The system flag (?) */
 104 #define KBD_MODE_NO_KEYLOCK     0x08    /* The keylock doesn't affect the keyboard if set */
 105 #define KBD_MODE_DISABLE_KBD    0x10    /* Disable keyboard interface */
 106 #define KBD_MODE_DISABLE_MOUSE  0x20    /* Disable mouse interface */
 107 #define KBD_MODE_KCC            0x40    /* Scan code conversion to PC format */
 108 #define KBD_MODE_RFU            0x80
 109
 110
 111 #define KDB_DATA_PORT           0x60
 112 #define KDB_COMMAND_PORT        0x64
 113
 114 #define LED_SCR                 0x01    /* scroll lock led */
 115 #define LED_CAP                 0x04    /* caps lock led */
 116 #define LED_NUM                 0x02    /* num lock led */
 117
 118 #define KBD_BUFFER_LEN          0x20    /* size of the keyboardbuffer */
 119
 120
 121 static volatile char kbd_buffer[KBD_BUFFER_LEN];
 122 static volatile int in_pointer = 0;
 123 static volatile int out_pointer = 0;
 124
 125
 126 static unsigned char num_lock = 0;
 127 static unsigned char caps_lock = 0;
 128 static unsigned char scroll_lock = 0;
 129 static unsigned char shift = 0;
 130 static unsigned char ctrl = 0;
 131 static unsigned char alt = 0;
 132 static unsigned char e0 = 0;
 133 static unsigned char leds = 0;
 134
 135 #define DEVNAME "kbd"
 136
 137 /* Simple translation table for the keys */
 138
 139 static unsigned char kbd_plain_xlate[] = {
 140         0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t',        /* 0x00 - 0x0f */
 141          'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's',        /* 0x10 - 0x1f */
 142          'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v',        /* 0x20 - 0x2f */
 143          'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 144         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 145          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 146         '\r',0xff,0xff
 147         };
 148
 149 static unsigned char kbd_shift_xlate[] = {
 150         0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t',        /* 0x00 - 0x0f */
 151          'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S',        /* 0x10 - 0x1f */
 152          'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V',        /* 0x20 - 0x2f */
 153          'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 154         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 155          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 156         '\r',0xff,0xff
 157         };
 158
 159 static unsigned char kbd_ctrl_xlate[] = {
 160         0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t',        /* 0x00 - 0x0f */
 161         0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13,        /* 0x10 - 0x1f */
 162         0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16,        /* 0x20 - 0x2f */
 163         0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
 164         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
 165          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
 166         '\r',0xff,0xff
 167         };
 168
 169 /******************************************************************
 170  * Init
 171  ******************************************************************/
 172 int isa_kbd_init(void)
 173 {
 174         char* result;
 175         result=kbd_initialize();
 176         if(result==NULL) {
 177                 PRINTF("AT Keyboard initialized\n");
 178                 irq_install_handler(25, (interrupt_handler_t *)handle_isa_int, NULL);
 179                 isa_irq_install_handler(KBD_INTERRUPT, (interrupt_handler_t *)kbd_interrupt, NULL);
 180                 return (1);
 181         } else {
 182                 printf("%s\n",result);
 183                 return (-1);
 184         }
 185 }
 186
 187 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
 188 extern int overwrite_console (void);
 189 #else
 190 int overwrite_console (void)
 191 {
 192         return (0);
 193 }
 194 #endif
 195
 196 int drv_isa_kbd_init (void)
 197 {
 198         int error;
 199         struct stdio_dev kbddev ;
 200         char *stdinname  = getenv ("stdin");
 201
 202         if(isa_kbd_init()==-1)
 203                 return -1;
 204         memset (&kbddev, 0, sizeof(kbddev));
 205         strcpy(kbddev.name, DEVNAME);
 206         kbddev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 207         kbddev.getc = kbd_getc ;
 208         kbddev.tstc = kbd_testc ;
 209
 210         error = stdio_register (&kbddev);
 211         if(error==0) {
 212                 /* check if this is the standard input device */
 213                 if(strcmp(stdinname,DEVNAME)==0) {
 214                         /* reassign the console */
 215                         if(overwrite_console()) {
 216                                 return 1;
 217                         }
 218                         error=console_assign(stdin,DEVNAME);
 219                         if(error==0)
 220                                 return 1;
 221                         else
 222                                 return error;
 223                 }
 224                 return 1;
 225         }
 226         return error;
 227 }
 228
 229 /******************************************************************
 230  * Queue handling
 231  ******************************************************************/
 232 /* puts character in the queue and sets up the in and out pointer */
 233 void kbd_put_queue(char data)
 234 {
 235         if((in_pointer+1)==KBD_BUFFER_LEN) {
 236                 if(out_pointer==0) {
 237                         return; /* buffer full */
 238                 } else{
 239                         in_pointer=0;
 240                 }
 241         } else {
 242                 if((in_pointer+1)==out_pointer)
 243                         return; /* buffer full */
 244                 in_pointer++;
 245         }
 246         kbd_buffer[in_pointer]=data;
 247         return;
 248 }
 249
 250 /* test if a character is in the queue */
 251 int kbd_testc(struct stdio_dev *dev)
 252 {
 253         if(in_pointer==out_pointer)
 254                 return(0); /* no data */
 255         else
 256                 return(1);
 257 }
 258 /* gets the character from the queue */
 259 int kbd_getc(struct stdio_dev *dev)
 260 {
 261         char c;
 262         while(in_pointer==out_pointer);
 263         if((out_pointer+1)==KBD_BUFFER_LEN)
 264                 out_pointer=0;
 265         else
 266                 out_pointer++;
 267         c=kbd_buffer[out_pointer];
 268         return (int)c;
 269
 270 }
 271
 272
 273 /* set LEDs */
 274
 275 void kbd_set_leds(void)
 276 {
 277         if(caps_lock==0)
 278                 leds&=~LED_CAP; /* switch caps_lock off */
 279         else
 280                 leds|=LED_CAP; /* switch on LED */
 281         if(num_lock==0)
 282                 leds&=~LED_NUM; /* switch LED off */
 283         else
 284                 leds|=LED_NUM;  /* switch on LED */
 285         if(scroll_lock==0)
 286                 leds&=~LED_SCR; /* switch LED off */
 287         else
 288                 leds|=LED_SCR; /* switch on LED */
 289         kbd_send_data(KBD_CMD_SET_LEDS);
 290         kbd_send_data(leds);
 291 }
 292
 293
 294 void handle_keyboard_event (unsigned char scancode)
 295 {
 296         unsigned char keycode;
 297
 298         /*  Convert scancode to keycode */
 299         PRINTF ("scancode %x\n", scancode);
 300         if (scancode == 0xe0) {
 301                 e0 = 1;         /* special charakters */
 302                 return;
 303         }
 304         if (e0 == 1) {
 305                 e0 = 0;         /* delete flag */
 306                 if (!(((scancode & 0x7F) == 0x38) ||    /* the right ctrl key */
 307                       ((scancode & 0x7F) == 0x1D) ||    /* the right alt key */
 308                       ((scancode & 0x7F) == 0x35) ||    /* the right '/' key */
 309                       ((scancode & 0x7F) == 0x1C)))
 310                         /* the right enter key */
 311                         /* we swallow unknown e0 codes */
 312                         return;
 313         }
 314         /* special cntrl keys */
 315         switch (scancode) {
 316         case 0x2A:
 317         case 0x36:              /* shift pressed */
 318                 shift = 1;
 319                 return;         /* do nothing else */
 320         case 0xAA:
 321         case 0xB6:              /* shift released */
 322                 shift = 0;
 323                 return;         /* do nothing else */
 324         case 0x38:              /* alt pressed */
 325                 alt = 1;
 326                 return;         /* do nothing else */
 327         case 0xB8:              /* alt released */
 328                 alt = 0;
 329                 return;         /* do nothing else */
 330         case 0x1d:              /* ctrl pressed */
 331                 ctrl = 1;
 332                 return;         /* do nothing else */
 333         case 0x9d:              /* ctrl released */
 334                 ctrl = 0;
 335                 return;         /* do nothing else */
 336         case 0x46:              /* scrollock pressed */
 337                 scroll_lock = ~scroll_lock;
 338                 kbd_set_leds ();
 339                 return;         /* do nothing else */
 340         case 0x3A:              /* capslock pressed */
 341                 caps_lock = ~caps_lock;
 342                 kbd_set_leds ();
 343                 return;
 344         case 0x45:              /* numlock pressed */
 345                 num_lock = ~num_lock;
 346                 kbd_set_leds ();
 347                 return;
 348         case 0xC6:              /* scroll lock released */
 349         case 0xC5:              /* num lock released */
 350         case 0xBA:              /* caps lock released */
 351                 return;         /* just swallow */
 352         }
 353         if ((scancode & 0x80) == 0x80)  /* key released */
 354                 return;
 355         /* now, decide which table we need */
 356         if (scancode > (sizeof (kbd_plain_xlate) / sizeof (kbd_plain_xlate[0]))) {      /* scancode not in list */
 357                 PRINTF ("unkown scancode %X\n", scancode);
 358                 return;         /* swallow it */
 359         }
 360         /* setup plain code first */
 361         keycode = kbd_plain_xlate[scancode];
 362         if (caps_lock == 1) {   /* caps_lock is pressed, overwrite plain code */
 363                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
 364                         PRINTF ("unkown caps-locked scancode %X\n", scancode);
 365                         return; /* swallow it */
 366                 }
 367                 keycode = kbd_shift_xlate[scancode];
 368                 if (keycode < 'A') {    /* we only want the alphas capital */
 369                         keycode = kbd_plain_xlate[scancode];
 370                 }
 371         }
 372         if (shift == 1) {       /* shift overwrites caps_lock */
 373                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
 374                         PRINTF ("unkown shifted scancode %X\n", scancode);
 375                         return; /* swallow it */
 376                 }
 377                 keycode = kbd_shift_xlate[scancode];
 378         }
 379         if (ctrl == 1) {        /* ctrl overwrites caps_lock and shift */
 380                 if (scancode > (sizeof (kbd_ctrl_xlate) / sizeof (kbd_ctrl_xlate[0]))) {        /* scancode not in list */
 381                         PRINTF ("unkown ctrl scancode %X\n", scancode);
 382                         return; /* swallow it */
 383                 }
 384                 keycode = kbd_ctrl_xlate[scancode];
 385         }
 386         /* check if valid keycode */
 387         if (keycode == 0xff) {
 388                 PRINTF ("unkown scancode %X\n", scancode);
 389                 return;         /* swallow unknown codes */
 390         }
 391
 392         kbd_put_queue (keycode);
 393         PRINTF ("%x\n", keycode);
 394 }
 395
 396 /*
 397  * This reads the keyboard status port, and does the
 398  * appropriate action.
 399  *
 400  */
 401 unsigned char handle_kbd_event(void)
 402 {
 403         unsigned char status = kbd_read_status();
 404         unsigned int work = 10000;
 405
 406         while ((--work > 0) && (status & KBD_STAT_OBF)) {
 407                 unsigned char scancode;
 408
 409                 scancode = kbd_read_input();
 410
 411                 /* Error bytes must be ignored to make the
 412                    Synaptics touchpads compaq use work */
 413                 /* Ignore error bytes */
 414                 if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR)))
 415                 {
 416                         if (status & KBD_STAT_MOUSE_OBF)
 417                                 ; /* not supported: handle_mouse_event(scancode); */
 418                         else
 419                                 handle_keyboard_event(scancode);
 420                 }
 421                 status = kbd_read_status();
 422         }
 423         if (!work)
 424                 PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
 425         return status;
 426 }
 427
 428
 429 /******************************************************************************
 430  * Lowlevel Part of keyboard section
 431  */
 432 unsigned char kbd_read_status(void)
 433 {
 434         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT));
 435 }
 436
 437 unsigned char kbd_read_input(void)
 438 {
 439         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT));
 440 }
 441
 442 void kbd_write_command(unsigned char cmd)
 443 {
 444         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT,cmd);
 445 }
 446
 447 void kbd_write_output(unsigned char data)
 448 {
 449         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT, data);
 450 }
 451
 452 int kbd_read_data(void)
 453 {
 454         int val;
 455         unsigned char status;
 456
 457         val = -1;
 458         status = kbd_read_status();
 459         if (status & KBD_STAT_OBF) {
 460                 val = kbd_read_input();
 461                 if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
 462                         val = -2;
 463         }
 464         return val;
 465 }
 466
 467 int kbd_wait_for_input(void)
 468 {
 469         unsigned long timeout;
 470         int val;
 471
 472         timeout = KBD_TIMEOUT;
 473         val=kbd_read_data();
 474         while(val < 0)
 475         {
 476                 if(timeout--==0)
 477                         return -1;
 478                 udelay(1000);
 479                 val=kbd_read_data();
 480         }
 481         return val;
 482 }
 483
 484
 485 int kb_wait(void)
 486 {
 487         unsigned long timeout = KBC_TIMEOUT * 10;
 488
 489         do {
 490                 unsigned char status = handle_kbd_event();
 491                 if (!(status & KBD_STAT_IBF))
 492                         return 0; /* ok */
 493                 udelay(1000);
 494                 timeout--;
 495         } while (timeout);
 496         return 1;
 497 }
 498
 499 void kbd_write_command_w(int data)
 500 {
 501         if(kb_wait())
 502                 PRINTF("timeout in kbd_write_command_w\n");
 503         kbd_write_command(data);
 504 }
 505
 506 void kbd_write_output_w(int data)
 507 {
 508         if(kb_wait())
 509                 PRINTF("timeout in kbd_write_output_w\n");
 510         kbd_write_output(data);
 511 }
 512
 513 void kbd_send_data(unsigned char data)
 514 {
 515         unsigned char status;
 516         disable_8259A_irq(1); /* disable interrupt */
 517         kbd_write_output_w(data);
 518         status = kbd_wait_for_input();
 519         if (status == KBD_REPLY_ACK)
 520                 enable_8259A_irq(1); /* enable interrupt */
 521 }
 522
 523
 524 char * kbd_initialize(void)
 525 {
 526         int status;
 527
 528         in_pointer = 0; /* delete in Buffer */
 529         out_pointer = 0;
 530         /*
 531          * Test the keyboard interface.
 532          * This seems to be the only way to get it going.
 533          * If the test is successful a x55 is placed in the input buffer.
 534          */
 535         kbd_write_command_w(KBD_CCMD_SELF_TEST);
 536         if (kbd_wait_for_input() != 0x55)
 537                 return "Kbd:   failed self test";
 538         /*
 539          * Perform a keyboard interface test.  This causes the controller
 540          * to test the keyboard clock and data lines.  The results of the
 541          * test are placed in the input buffer.
 542          */
 543         kbd_write_command_w(KBD_CCMD_KBD_TEST);
 544         if (kbd_wait_for_input() != 0x00)
 545                 return "Kbd:   interface failed self test";
 546         /*
 547          * Enable the keyboard by allowing the keyboard clock to run.
 548          */
 549         kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
 550         status = kbd_wait_for_input();
 551         /*
 552          * Reset keyboard. If the read times out
 553          * then the assumption is that no keyboard is
 554          * plugged into the machine.
 555          * This defaults the keyboard to scan-code set 2.
 556          *
 557          * Set up to try again if the keyboard asks for RESEND.
 558          */
 559         do {
 560                 kbd_write_output_w(KBD_CMD_RESET);
 561                 status = kbd_wait_for_input();
 562                 if (status == KBD_REPLY_ACK)
 563                         break;
 564                 if (status != KBD_REPLY_RESEND) {
 565                         PRINTF("status: %X\n",status);
 566                         return "Kbd:   reset failed, no ACK";
 567                 }
 568         } while (1);
 569         if (kbd_wait_for_input() != KBD_REPLY_POR)
 570                 return "Kbd:   reset failed, no POR";
 571
 572         /*
 573          * Set keyboard controller mode. During this, the keyboard should be
 574          * in the disabled state.
 575          *
 576          * Set up to try again if the keyboard asks for RESEND.
 577          */
 578         do {
 579                 kbd_write_output_w(KBD_CMD_DISABLE);
 580                 status = kbd_wait_for_input();
 581                 if (status == KBD_REPLY_ACK)
 582                         break;
 583                 if (status != KBD_REPLY_RESEND)
 584                         return "Kbd:   disable keyboard: no ACK";
 585         } while (1);
 586
 587         kbd_write_command_w(KBD_CCMD_WRITE_MODE);
 588         kbd_write_output_w(KBD_MODE_KBD_INT
 589                               | KBD_MODE_SYS
 590                               | KBD_MODE_DISABLE_MOUSE
 591                               | KBD_MODE_KCC);
 592
 593         /* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
 594         kbd_write_command_w(KBD_CCMD_READ_MODE);
 595         if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
 596                 /*
 597                  * If the controller does not support conversion,
 598                  * Set the keyboard to scan-code set 1.
 599                  */
 600                 kbd_write_output_w(0xF0);
 601                 kbd_wait_for_input();
 602                 kbd_write_output_w(0x01);
 603                 kbd_wait_for_input();
 604         }
 605         kbd_write_output_w(KBD_CMD_ENABLE);
 606         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 607                 return "Kbd:   enable keyboard: no ACK";
 608
 609         /*
 610          * Finally, set the typematic rate to maximum.
 611          */
 612         kbd_write_output_w(KBD_CMD_SET_RATE);
 613         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 614                 return "Kbd:   Set rate: no ACK";
 615         kbd_write_output_w(0x00);
 616         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 617                 return "Kbd:   Set rate: no ACK";
 618         return NULL;
 619 }
 620
 621 void kbd_interrupt(void)
 622 {
 623         handle_kbd_event();
 624 }