Add qemu 2.4.0
[kvmfornfv.git] / qemu / roms / u-boot / 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.putc = NULL ;
208         kbddev.puts = NULL ;
209         kbddev.getc = kbd_getc ;
210         kbddev.tstc = kbd_testc ;
211
212         error = stdio_register (&kbddev);
213         if(error==0) {
214                 /* check if this is the standard input device */
215                 if(strcmp(stdinname,DEVNAME)==0) {
216                         /* reassign the console */
217                         if(overwrite_console()) {
218                                 return 1;
219                         }
220                         error=console_assign(stdin,DEVNAME);
221                         if(error==0)
222                                 return 1;
223                         else
224                                 return error;
225                 }
226                 return 1;
227         }
228         return error;
229 }
230
231 /******************************************************************
232  * Queue handling
233  ******************************************************************/
234 /* puts character in the queue and sets up the in and out pointer */
235 void kbd_put_queue(char data)
236 {
237         if((in_pointer+1)==KBD_BUFFER_LEN) {
238                 if(out_pointer==0) {
239                         return; /* buffer full */
240                 } else{
241                         in_pointer=0;
242                 }
243         } else {
244                 if((in_pointer+1)==out_pointer)
245                         return; /* buffer full */
246                 in_pointer++;
247         }
248         kbd_buffer[in_pointer]=data;
249         return;
250 }
251
252 /* test if a character is in the queue */
253 int kbd_testc(void)
254 {
255         if(in_pointer==out_pointer)
256                 return(0); /* no data */
257         else
258                 return(1);
259 }
260 /* gets the character from the queue */
261 int kbd_getc(void)
262 {
263         char c;
264         while(in_pointer==out_pointer);
265         if((out_pointer+1)==KBD_BUFFER_LEN)
266                 out_pointer=0;
267         else
268                 out_pointer++;
269         c=kbd_buffer[out_pointer];
270         return (int)c;
271
272 }
273
274
275 /* set LEDs */
276
277 void kbd_set_leds(void)
278 {
279         if(caps_lock==0)
280                 leds&=~LED_CAP; /* switch caps_lock off */
281         else
282                 leds|=LED_CAP; /* switch on LED */
283         if(num_lock==0)
284                 leds&=~LED_NUM; /* switch LED off */
285         else
286                 leds|=LED_NUM;  /* switch on LED */
287         if(scroll_lock==0)
288                 leds&=~LED_SCR; /* switch LED off */
289         else
290                 leds|=LED_SCR; /* switch on LED */
291         kbd_send_data(KBD_CMD_SET_LEDS);
292         kbd_send_data(leds);
293 }
294
295
296 void handle_keyboard_event (unsigned char scancode)
297 {
298         unsigned char keycode;
299
300         /*  Convert scancode to keycode */
301         PRINTF ("scancode %x\n", scancode);
302         if (scancode == 0xe0) {
303                 e0 = 1;         /* special charakters */
304                 return;
305         }
306         if (e0 == 1) {
307                 e0 = 0;         /* delete flag */
308                 if (!(((scancode & 0x7F) == 0x38) ||    /* the right ctrl key */
309                       ((scancode & 0x7F) == 0x1D) ||    /* the right alt key */
310                       ((scancode & 0x7F) == 0x35) ||    /* the right '/' key */
311                       ((scancode & 0x7F) == 0x1C)))
312                         /* the right enter key */
313                         /* we swallow unknown e0 codes */
314                         return;
315         }
316         /* special cntrl keys */
317         switch (scancode) {
318         case 0x2A:
319         case 0x36:              /* shift pressed */
320                 shift = 1;
321                 return;         /* do nothing else */
322         case 0xAA:
323         case 0xB6:              /* shift released */
324                 shift = 0;
325                 return;         /* do nothing else */
326         case 0x38:              /* alt pressed */
327                 alt = 1;
328                 return;         /* do nothing else */
329         case 0xB8:              /* alt released */
330                 alt = 0;
331                 return;         /* do nothing else */
332         case 0x1d:              /* ctrl pressed */
333                 ctrl = 1;
334                 return;         /* do nothing else */
335         case 0x9d:              /* ctrl released */
336                 ctrl = 0;
337                 return;         /* do nothing else */
338         case 0x46:              /* scrollock pressed */
339                 scroll_lock = ~scroll_lock;
340                 kbd_set_leds ();
341                 return;         /* do nothing else */
342         case 0x3A:              /* capslock pressed */
343                 caps_lock = ~caps_lock;
344                 kbd_set_leds ();
345                 return;
346         case 0x45:              /* numlock pressed */
347                 num_lock = ~num_lock;
348                 kbd_set_leds ();
349                 return;
350         case 0xC6:              /* scroll lock released */
351         case 0xC5:              /* num lock released */
352         case 0xBA:              /* caps lock released */
353                 return;         /* just swallow */
354         }
355         if ((scancode & 0x80) == 0x80)  /* key released */
356                 return;
357         /* now, decide which table we need */
358         if (scancode > (sizeof (kbd_plain_xlate) / sizeof (kbd_plain_xlate[0]))) {      /* scancode not in list */
359                 PRINTF ("unkown scancode %X\n", scancode);
360                 return;         /* swallow it */
361         }
362         /* setup plain code first */
363         keycode = kbd_plain_xlate[scancode];
364         if (caps_lock == 1) {   /* caps_lock is pressed, overwrite plain code */
365                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
366                         PRINTF ("unkown caps-locked scancode %X\n", scancode);
367                         return; /* swallow it */
368                 }
369                 keycode = kbd_shift_xlate[scancode];
370                 if (keycode < 'A') {    /* we only want the alphas capital */
371                         keycode = kbd_plain_xlate[scancode];
372                 }
373         }
374         if (shift == 1) {       /* shift overwrites caps_lock */
375                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
376                         PRINTF ("unkown shifted scancode %X\n", scancode);
377                         return; /* swallow it */
378                 }
379                 keycode = kbd_shift_xlate[scancode];
380         }
381         if (ctrl == 1) {        /* ctrl overwrites caps_lock and shift */
382                 if (scancode > (sizeof (kbd_ctrl_xlate) / sizeof (kbd_ctrl_xlate[0]))) {        /* scancode not in list */
383                         PRINTF ("unkown ctrl scancode %X\n", scancode);
384                         return; /* swallow it */
385                 }
386                 keycode = kbd_ctrl_xlate[scancode];
387         }
388         /* check if valid keycode */
389         if (keycode == 0xff) {
390                 PRINTF ("unkown scancode %X\n", scancode);
391                 return;         /* swallow unknown codes */
392         }
393
394         kbd_put_queue (keycode);
395         PRINTF ("%x\n", keycode);
396 }
397
398 /*
399  * This reads the keyboard status port, and does the
400  * appropriate action.
401  *
402  */
403 unsigned char handle_kbd_event(void)
404 {
405         unsigned char status = kbd_read_status();
406         unsigned int work = 10000;
407
408         while ((--work > 0) && (status & KBD_STAT_OBF)) {
409                 unsigned char scancode;
410
411                 scancode = kbd_read_input();
412
413                 /* Error bytes must be ignored to make the
414                    Synaptics touchpads compaq use work */
415                 /* Ignore error bytes */
416                 if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR)))
417                 {
418                         if (status & KBD_STAT_MOUSE_OBF)
419                                 ; /* not supported: handle_mouse_event(scancode); */
420                         else
421                                 handle_keyboard_event(scancode);
422                 }
423                 status = kbd_read_status();
424         }
425         if (!work)
426                 PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
427         return status;
428 }
429
430
431 /******************************************************************************
432  * Lowlevel Part of keyboard section
433  */
434 unsigned char kbd_read_status(void)
435 {
436         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT));
437 }
438
439 unsigned char kbd_read_input(void)
440 {
441         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT));
442 }
443
444 void kbd_write_command(unsigned char cmd)
445 {
446         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT,cmd);
447 }
448
449 void kbd_write_output(unsigned char data)
450 {
451         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT, data);
452 }
453
454 int kbd_read_data(void)
455 {
456         int val;
457         unsigned char status;
458
459         val = -1;
460         status = kbd_read_status();
461         if (status & KBD_STAT_OBF) {
462                 val = kbd_read_input();
463                 if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
464                         val = -2;
465         }
466         return val;
467 }
468
469 int kbd_wait_for_input(void)
470 {
471         unsigned long timeout;
472         int val;
473
474         timeout = KBD_TIMEOUT;
475         val=kbd_read_data();
476         while(val < 0)
477         {
478                 if(timeout--==0)
479                         return -1;
480                 udelay(1000);
481                 val=kbd_read_data();
482         }
483         return val;
484 }
485
486
487 int kb_wait(void)
488 {
489         unsigned long timeout = KBC_TIMEOUT * 10;
490
491         do {
492                 unsigned char status = handle_kbd_event();
493                 if (!(status & KBD_STAT_IBF))
494                         return 0; /* ok */
495                 udelay(1000);
496                 timeout--;
497         } while (timeout);
498         return 1;
499 }
500
501 void kbd_write_command_w(int data)
502 {
503         if(kb_wait())
504                 PRINTF("timeout in kbd_write_command_w\n");
505         kbd_write_command(data);
506 }
507
508 void kbd_write_output_w(int data)
509 {
510         if(kb_wait())
511                 PRINTF("timeout in kbd_write_output_w\n");
512         kbd_write_output(data);
513 }
514
515 void kbd_send_data(unsigned char data)
516 {
517         unsigned char status;
518         disable_8259A_irq(1); /* disable interrupt */
519         kbd_write_output_w(data);
520         status = kbd_wait_for_input();
521         if (status == KBD_REPLY_ACK)
522                 enable_8259A_irq(1); /* enable interrupt */
523 }
524
525
526 char * kbd_initialize(void)
527 {
528         int status;
529
530         in_pointer = 0; /* delete in Buffer */
531         out_pointer = 0;
532         /*
533          * Test the keyboard interface.
534          * This seems to be the only way to get it going.
535          * If the test is successful a x55 is placed in the input buffer.
536          */
537         kbd_write_command_w(KBD_CCMD_SELF_TEST);
538         if (kbd_wait_for_input() != 0x55)
539                 return "Kbd:   failed self test";
540         /*
541          * Perform a keyboard interface test.  This causes the controller
542          * to test the keyboard clock and data lines.  The results of the
543          * test are placed in the input buffer.
544          */
545         kbd_write_command_w(KBD_CCMD_KBD_TEST);
546         if (kbd_wait_for_input() != 0x00)
547                 return "Kbd:   interface failed self test";
548         /*
549          * Enable the keyboard by allowing the keyboard clock to run.
550          */
551         kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
552         status = kbd_wait_for_input();
553         /*
554          * Reset keyboard. If the read times out
555          * then the assumption is that no keyboard is
556          * plugged into the machine.
557          * This defaults the keyboard to scan-code set 2.
558          *
559          * Set up to try again if the keyboard asks for RESEND.
560          */
561         do {
562                 kbd_write_output_w(KBD_CMD_RESET);
563                 status = kbd_wait_for_input();
564                 if (status == KBD_REPLY_ACK)
565                         break;
566                 if (status != KBD_REPLY_RESEND) {
567                         PRINTF("status: %X\n",status);
568                         return "Kbd:   reset failed, no ACK";
569                 }
570         } while (1);
571         if (kbd_wait_for_input() != KBD_REPLY_POR)
572                 return "Kbd:   reset failed, no POR";
573
574         /*
575          * Set keyboard controller mode. During this, the keyboard should be
576          * in the disabled state.
577          *
578          * Set up to try again if the keyboard asks for RESEND.
579          */
580         do {
581                 kbd_write_output_w(KBD_CMD_DISABLE);
582                 status = kbd_wait_for_input();
583                 if (status == KBD_REPLY_ACK)
584                         break;
585                 if (status != KBD_REPLY_RESEND)
586                         return "Kbd:   disable keyboard: no ACK";
587         } while (1);
588
589         kbd_write_command_w(KBD_CCMD_WRITE_MODE);
590         kbd_write_output_w(KBD_MODE_KBD_INT
591                               | KBD_MODE_SYS
592                               | KBD_MODE_DISABLE_MOUSE
593                               | KBD_MODE_KCC);
594
595         /* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
596         kbd_write_command_w(KBD_CCMD_READ_MODE);
597         if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
598                 /*
599                  * If the controller does not support conversion,
600                  * Set the keyboard to scan-code set 1.
601                  */
602                 kbd_write_output_w(0xF0);
603                 kbd_wait_for_input();
604                 kbd_write_output_w(0x01);
605                 kbd_wait_for_input();
606         }
607         kbd_write_output_w(KBD_CMD_ENABLE);
608         if (kbd_wait_for_input() != KBD_REPLY_ACK)
609                 return "Kbd:   enable keyboard: no ACK";
610
611         /*
612          * Finally, set the typematic rate to maximum.
613          */
614         kbd_write_output_w(KBD_CMD_SET_RATE);
615         if (kbd_wait_for_input() != KBD_REPLY_ACK)
616                 return "Kbd:   Set rate: no ACK";
617         kbd_write_output_w(0x00);
618         if (kbd_wait_for_input() != KBD_REPLY_ACK)
619                 return "Kbd:   Set rate: no ACK";
620         return NULL;
621 }
622
623 void kbd_interrupt(void)
624 {
625         handle_kbd_event();
626 }