116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*-
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* Copyright (c) 1997 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp $
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*/
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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#include <i386/isa/isa.h>
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#include <dev/kbd/atkbdcreg.h>
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#include "boot.h"
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#define PROBE_MAXRETRY 5
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#define PROBE_MAXWAIT 400
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#define IO_DUMMY 0x84
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/* 7 microsec delay necessary for some keyboard controllers */
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static void
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delay7(void)
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{
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/*
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* I know this is broken, but no timer is avaiable yet at this stage...
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* See also comments in `delay1ms()' in `io.c'.
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*/
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inb(IO_DUMMY); inb(IO_DUMMY);
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inb(IO_DUMMY); inb(IO_DUMMY);
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inb(IO_DUMMY); inb(IO_DUMMY);
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}
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/*
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* Perform a simple test on the keyboard; issue the ECHO command and see
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* if the right answer is returned. We don't do anything as drastic as
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* full keyboard reset; it will be too troublesome and take too much time.
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*/
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int
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probe_keyboard(void)
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{
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int retry = PROBE_MAXRETRY;
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int wait;
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int i;
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while (--retry >= 0) {
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/* flush any noise */
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while (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) {
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delay7();
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inb(IO_KBD + KBD_DATA_PORT);
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delay1ms();
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}
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/* wait until the controller can accept a command */
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for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
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if (((i = inb(IO_KBD + KBD_STATUS_PORT))
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& (KBDS_INPUT_BUFFER_FULL | KBDS_ANY_BUFFER_FULL)) == 0)
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break;
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if (i & KBDS_ANY_BUFFER_FULL) {
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delay7();
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inb(IO_KBD + KBD_DATA_PORT);
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}
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delay1ms();
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}
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if (wait <= 0)
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continue;
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/* send the ECHO command */
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outb(IO_KBD + KBD_DATA_PORT, KBDC_ECHO);
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/* wait for a response */
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for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
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if (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL)
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break;
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delay1ms();
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}
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if (wait <= 0)
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continue;
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delay7();
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i = inb(IO_KBD + KBD_DATA_PORT);
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#ifdef PROBE_KBD_BEBUG
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printf("probe_keyboard: got 0x%x.\n", i);
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#endif
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if (i == KBD_ECHO) {
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/* got the right answer */
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return (0);
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}
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}
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return (1);
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}
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