drivers/pc_keyb.c

   1 /***********************************************************************
   2  *
   3  * (C) Copyright 2004
   4  * DENX Software Engineering
   5  * Wolfgang Denk, wd@denx.de
   6  * All rights reserved.
   7  *
   8  * PS/2 keyboard driver
   9  *
  10  * Originally from linux source (drivers/char/pc_keyb.c)
  11  *
  12  ***********************************************************************/
  13
  14 #include <common.h>
  15
  16 #ifdef CONFIG_PS2KBD
  17
  18 #include <keyboard.h>
  19 #include <pc_keyb.h>
  20
  21 #undef KBG_DEBUG
  22
  23 #ifdef KBG_DEBUG
  24 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  25 #else
  26 #define PRINTF(fmt,args...)
  27 #endif
  28
  29
  30 /*
  31  * This reads the keyboard status port, and does the
  32  * appropriate action.
  33  *
  34  */
  35 static unsigned char handle_kbd_event(void)
  36 {
  37         unsigned char status = kbd_read_status();
  38         unsigned int work = 10000;
  39
  40         while ((--work > 0) && (status & KBD_STAT_OBF)) {
  41                 unsigned char scancode;
  42
  43                 scancode = kbd_read_input();
  44
  45                 /* Error bytes must be ignored to make the
  46                    Synaptics touchpads compaq use work */
  47                 /* Ignore error bytes */
  48                 if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR))) {
  49                         if (status & KBD_STAT_MOUSE_OBF)
  50                                 ; /* not supported: handle_mouse_event(scancode); */
  51                         else
  52                                 handle_scancode(scancode);
  53                 }
  54                 status = kbd_read_status();
  55         }
  56         if (!work)
  57                 PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
  58         return status;
  59 }
  60
  61
  62 static int kbd_read_data(void)
  63 {
  64         int val;
  65         unsigned char status;
  66
  67         val=-1;
  68         status = kbd_read_status();
  69         if (status & KBD_STAT_OBF) {
  70                 val = kbd_read_input();
  71                 if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
  72                         val = -2;
  73         }
  74         return val;
  75 }
  76
  77 static int kbd_wait_for_input(void)
  78 {
  79         unsigned long timeout;
  80         int val;
  81
  82         timeout = KBD_TIMEOUT;
  83         val=kbd_read_data();
  84         while(val < 0) {
  85                 if(timeout--==0)
  86                         return -1;
  87                 udelay(1000);
  88                 val=kbd_read_data();
  89         }
  90         return val;
  91 }
  92
  93
  94 static int kb_wait(void)
  95 {
  96         unsigned long timeout = KBC_TIMEOUT * 10;
  97
  98         do {
  99                 unsigned char status = handle_kbd_event();
 100                 if (!(status & KBD_STAT_IBF))
 101                         return 0; /* ok */
 102                 udelay(1000);
 103                 timeout--;
 104         } while (timeout);
 105         return 1;
 106 }
 107
 108 static void kbd_write_command_w(int data)
 109 {
 110         if(kb_wait())
 111                 PRINTF("timeout in kbd_write_command_w\n");
 112         kbd_write_command(data);
 113 }
 114
 115 static void kbd_write_output_w(int data)
 116 {
 117         if(kb_wait())
 118                 PRINTF("timeout in kbd_write_output_w\n");
 119         kbd_write_output(data);
 120 }
 121
 122 static void kbd_send_data(unsigned char data)
 123 {
 124         kbd_write_output_w(data);
 125         kbd_wait_for_input();
 126 }
 127
 128
 129 static char * kbd_initialize(void)
 130 {
 131         int status;
 132
 133         /*
 134          * Test the keyboard interface.
 135          * This seems to be the only way to get it going.
 136          * If the test is successful a x55 is placed in the input buffer.
 137          */
 138         kbd_write_command_w(KBD_CCMD_SELF_TEST);
 139         if (kbd_wait_for_input() != 0x55)
 140                 return "Kbd:   failed self test";
 141         /*
 142          * Perform a keyboard interface test.  This causes the controller
 143          * to test the keyboard clock and data lines.  The results of the
 144          * test are placed in the input buffer.
 145          */
 146         kbd_write_command_w(KBD_CCMD_KBD_TEST);
 147         if (kbd_wait_for_input() != 0x00)
 148                 return "Kbd:   interface failed self test";
 149         /*
 150          * Enable the keyboard by allowing the keyboard clock to run.
 151          */
 152         kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
 153
 154         /*
 155          * Reset keyboard. If the read times out
 156          * then the assumption is that no keyboard is
 157          * plugged into the machine.
 158          * This defaults the keyboard to scan-code set 2.
 159          *
 160          * Set up to try again if the keyboard asks for RESEND.
 161          */
 162         do {
 163                 kbd_write_output_w(KBD_CMD_RESET);
 164                 status = kbd_wait_for_input();
 165                 if (status == KBD_REPLY_ACK)
 166                         break;
 167                 if (status != KBD_REPLY_RESEND) {
 168                         PRINTF("status: %X\n",status);
 169                         return "Kbd:   reset failed, no ACK";
 170                 }
 171         } while (1);
 172         if (kbd_wait_for_input() != KBD_REPLY_POR)
 173                 return "Kbd:   reset failed, no POR";
 174
 175         /*
 176          * Set keyboard controller mode. During this, the keyboard should be
 177          * in the disabled state.
 178          *
 179          * Set up to try again if the keyboard asks for RESEND.
 180          */
 181         do {
 182                 kbd_write_output_w(KBD_CMD_DISABLE);
 183                 status = kbd_wait_for_input();
 184                 if (status == KBD_REPLY_ACK)
 185                         break;
 186                 if (status != KBD_REPLY_RESEND)
 187                         return "Kbd:   disable keyboard: no ACK";
 188         } while (1);
 189
 190         kbd_write_command_w(KBD_CCMD_WRITE_MODE);
 191         kbd_write_output_w(KBD_MODE_KBD_INT
 192                               | KBD_MODE_SYS
 193                               | KBD_MODE_DISABLE_MOUSE
 194                               | KBD_MODE_KCC);
 195
 196         /* ibm powerpc portables need this to use scan-code set 1 -- Cort */
 197         kbd_write_command_w(KBD_CCMD_READ_MODE);
 198         if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
 199                 /*
 200                  * If the controller does not support conversion,
 201                  * Set the keyboard to scan-code set 1.
 202                  */
 203                 kbd_write_output_w(0xF0);
 204                 kbd_wait_for_input();
 205                 kbd_write_output_w(0x01);
 206                 kbd_wait_for_input();
 207         }
 208         kbd_write_output_w(KBD_CMD_ENABLE);
 209         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 210                 return "Kbd:   enable keyboard: no ACK";
 211
 212         /*
 213          * Finally, set the typematic rate to maximum.
 214          */
 215         kbd_write_output_w(KBD_CMD_SET_RATE);
 216         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 217                 return "Kbd:   Set rate: no ACK";
 218         kbd_write_output_w(0x00);
 219         if (kbd_wait_for_input() != KBD_REPLY_ACK)
 220                 return "Kbd:   Set rate: no ACK";
 221         return NULL;
 222 }
 223
 224 static void kbd_interrupt(void *dev_id)
 225 {
 226         handle_kbd_event();
 227 }
 228
 229 /******************************************************************
 230  * Init
 231  ******************************************************************/
 232
 233 int kbd_init_hw(void)
 234 {
 235         char* result;
 236
 237         kbd_request_region();
 238
 239         result=kbd_initialize();
 240         if (result==NULL) {
 241                 PRINTF("AT Keyboard initialized\n");
 242                 kbd_request_irq(kbd_interrupt);
 243                 return (1);
 244         } else {
 245                 printf("%s\n",result);
 246                 return (-1);
 247         }
 248 }
 249
 250 void pckbd_leds(unsigned char leds)
 251 {
 252         kbd_send_data(KBD_CMD_SET_LEDS);
 253         kbd_send_data(leds);
 254 }
 255
 256 #endif /* CONFIG_PS2KBD */