mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-23 10:28:51 +09:00
257 lines
5.5 KiB
C
257 lines
5.5 KiB
C
/***********************************************************************
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*
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* (C) Copyright 2004
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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* All rights reserved.
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*
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* PS/2 keyboard driver
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*
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* Originally from linux source (drivers/char/pc_keyb.c)
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*
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***********************************************************************/
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#include <common.h>
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#ifdef CONFIG_PS2KBD
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#include <keyboard.h>
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#include <pc_keyb.h>
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#undef KBG_DEBUG
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#ifdef KBG_DEBUG
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#define PRINTF(fmt,args...) printf (fmt ,##args)
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#else
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#define PRINTF(fmt,args...)
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#endif
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/*
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* This reads the keyboard status port, and does the
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* appropriate action.
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*
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*/
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static unsigned char handle_kbd_event(void)
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{
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unsigned char status = kbd_read_status();
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unsigned int work = 10000;
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while ((--work > 0) && (status & KBD_STAT_OBF)) {
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unsigned char scancode;
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scancode = kbd_read_input();
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/* Error bytes must be ignored to make the
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Synaptics touchpads compaq use work */
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/* Ignore error bytes */
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if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR))) {
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if (status & KBD_STAT_MOUSE_OBF)
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; /* not supported: handle_mouse_event(scancode); */
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else
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handle_scancode(scancode);
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}
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status = kbd_read_status();
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}
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if (!work)
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PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
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return status;
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}
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static int kbd_read_data(void)
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{
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int val;
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unsigned char status;
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val = -1;
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status = kbd_read_status();
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if (status & KBD_STAT_OBF) {
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val = kbd_read_input();
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if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
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val = -2;
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}
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return val;
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}
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static int kbd_wait_for_input(void)
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{
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unsigned long timeout;
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int val;
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timeout = KBD_TIMEOUT;
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val=kbd_read_data();
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while(val < 0) {
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if(timeout--==0)
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return -1;
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udelay(1000);
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val=kbd_read_data();
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}
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return val;
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}
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static int kb_wait(void)
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{
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unsigned long timeout = KBC_TIMEOUT * 10;
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do {
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unsigned char status = handle_kbd_event();
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if (!(status & KBD_STAT_IBF))
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return 0; /* ok */
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udelay(1000);
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timeout--;
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} while (timeout);
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return 1;
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}
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static void kbd_write_command_w(int data)
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{
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if(kb_wait())
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PRINTF("timeout in kbd_write_command_w\n");
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kbd_write_command(data);
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}
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static void kbd_write_output_w(int data)
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{
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if(kb_wait())
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PRINTF("timeout in kbd_write_output_w\n");
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kbd_write_output(data);
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}
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static void kbd_send_data(unsigned char data)
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{
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kbd_write_output_w(data);
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kbd_wait_for_input();
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}
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static char * kbd_initialize(void)
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{
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int status;
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/*
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* Test the keyboard interface.
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* This seems to be the only way to get it going.
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* If the test is successful a x55 is placed in the input buffer.
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*/
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kbd_write_command_w(KBD_CCMD_SELF_TEST);
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if (kbd_wait_for_input() != 0x55)
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return "Kbd: failed self test";
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/*
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* Perform a keyboard interface test. This causes the controller
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* to test the keyboard clock and data lines. The results of the
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* test are placed in the input buffer.
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*/
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kbd_write_command_w(KBD_CCMD_KBD_TEST);
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if (kbd_wait_for_input() != 0x00)
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return "Kbd: interface failed self test";
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/*
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* Enable the keyboard by allowing the keyboard clock to run.
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*/
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kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
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/*
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* Reset keyboard. If the read times out
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* then the assumption is that no keyboard is
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* plugged into the machine.
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* This defaults the keyboard to scan-code set 2.
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*
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* Set up to try again if the keyboard asks for RESEND.
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*/
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do {
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kbd_write_output_w(KBD_CMD_RESET);
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status = kbd_wait_for_input();
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if (status == KBD_REPLY_ACK)
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break;
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if (status != KBD_REPLY_RESEND) {
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PRINTF("status: %X\n",status);
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return "Kbd: reset failed, no ACK";
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}
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} while (1);
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if (kbd_wait_for_input() != KBD_REPLY_POR)
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return "Kbd: reset failed, no POR";
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/*
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* Set keyboard controller mode. During this, the keyboard should be
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* in the disabled state.
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*
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* Set up to try again if the keyboard asks for RESEND.
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*/
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do {
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kbd_write_output_w(KBD_CMD_DISABLE);
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status = kbd_wait_for_input();
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if (status == KBD_REPLY_ACK)
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break;
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if (status != KBD_REPLY_RESEND)
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return "Kbd: disable keyboard: no ACK";
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} while (1);
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kbd_write_command_w(KBD_CCMD_WRITE_MODE);
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kbd_write_output_w(KBD_MODE_KBD_INT
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| KBD_MODE_SYS
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| KBD_MODE_DISABLE_MOUSE
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| KBD_MODE_KCC);
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/* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
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kbd_write_command_w(KBD_CCMD_READ_MODE);
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if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
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/*
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* If the controller does not support conversion,
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* Set the keyboard to scan-code set 1.
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*/
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kbd_write_output_w(0xF0);
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kbd_wait_for_input();
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kbd_write_output_w(0x01);
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kbd_wait_for_input();
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}
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kbd_write_output_w(KBD_CMD_ENABLE);
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if (kbd_wait_for_input() != KBD_REPLY_ACK)
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return "Kbd: enable keyboard: no ACK";
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/*
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* Finally, set the typematic rate to maximum.
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*/
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kbd_write_output_w(KBD_CMD_SET_RATE);
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if (kbd_wait_for_input() != KBD_REPLY_ACK)
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return "Kbd: Set rate: no ACK";
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kbd_write_output_w(0x00);
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if (kbd_wait_for_input() != KBD_REPLY_ACK)
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return "Kbd: Set rate: no ACK";
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return NULL;
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}
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static void kbd_interrupt(void *dev_id)
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{
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handle_kbd_event();
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}
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/******************************************************************
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* Init
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******************************************************************/
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int kbd_init_hw(void)
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{
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char* result;
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kbd_request_region();
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result=kbd_initialize();
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if (result==NULL) {
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PRINTF("AT Keyboard initialized\n");
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kbd_request_irq(kbd_interrupt);
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return (1);
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} else {
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printf("%s\n",result);
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return (-1);
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}
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}
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void pckbd_leds(unsigned char leds)
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{
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kbd_send_data(KBD_CMD_SET_LEDS);
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kbd_send_data(leds);
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}
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#endif /* CONFIG_PS2KBD */
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