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