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freebsd/sys/isa/kbdio.c
KATO Takenori 280a2265d9 - Modified for PC-98. 
- Included IBM-PC specific code in #ifndef PC98.
1997-01-16 14:56:16 +00:00

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/*-
* Copyright (c) 1996 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "sc.h"
#include "psm.h"
#include "opt_kbdio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <machine/clock.h>
#ifdef PC98
#include <pc98/pc98/pc98.h>
#else
#include <i386/isa/isa.h>
#endif
#include <i386/isa/isa_device.h>
#include <i386/isa/kbdio.h>
/*
* driver specific options: the following options may be set by
* `options' statements in the kernel configuration file.
*/
/* retry count */
#ifndef KBD_MAXRETRY
#define KBD_MAXRETRY 3
#endif
/* timing parameters */
#ifndef KBD_RESETDELAY
#define KBD_RESETDELAY 200 /* wait 200msec after kbd/mouse reset */
#endif
#ifndef KBD_MAXWAIT
#define KBD_MAXWAIT 5 /* wait 5 times at most after reset */
#endif
/* I/O recovery time */
#ifdef PC98
#define KBDC_DELAYTIME 37
#define KBDD_DELAYTIME 37
#else
#define KBDC_DELAYTIME 20
#define KBDD_DELAYTIME 7
#endif
/* debug option */
#ifndef KBDIO_DEBUG
#define KBDIO_DEBUG 0
#endif
/* end of driver specific options */
/* constants */
#define NKBDC max(NSC, NPSM)
#define KBDQ_BUFSIZE 32
/* macros */
#ifndef max
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif
#ifndef min
#define min(x,y) ((x) < (y) ? (x) : (y))
#endif
#define kbdcp(p) ((struct kbdc_softc *)(p))
#define nextq(i) (((i) + 1) % KBDQ_BUFSIZE)
#define availq(q) ((q)->head != (q)->tail)
#if KBDIO_DEBUG >= 2
#define emptyq(q) ((q)->tail = (q)->head = (q)->qcount = 0)
#else
#define emptyq(q) ((q)->tail = (q)->head = 0)
#endif
/* local variables */
typedef struct _kqueue {
int head;
int tail;
unsigned char q[KBDQ_BUFSIZE];
#if KBDIO_DEBUG >= 2
int call_count;
int qcount;
int max_qcount;
#endif
} kqueue;
struct kbdc_softc {
int port; /* base port address */
int command_byte; /* current command byte value */
int command_mask; /* command byte mask bits for kbd/aux devices */
int lock; /* FIXME: XXX not quite a semaphore... */
kqueue kbd; /* keyboard data queue */
kqueue aux; /* auxiliary data queue */
};
static struct kbdc_softc kbdc_softc[NKBDC] = { { 0 }, };
static int verbose = KBDIO_DEBUG;
/* function prototypes */
#ifndef PC98
static int addq(kqueue *q, int c);
static int removeq(kqueue *q);
static int wait_while_controller_busy(struct kbdc_softc *kbdc);
static int wait_for_data(struct kbdc_softc *kbdc);
#endif
static int wait_for_kbd_data(struct kbdc_softc *kbdc);
#ifndef PC98
static int wait_for_kbd_ack(struct kbdc_softc *kbdc);
static int wait_for_aux_data(struct kbdc_softc *kbdc);
static int wait_for_aux_ack(struct kbdc_softc *kbdc);
#endif
/* associate a port number with a KBDC */
KBDC
kbdc_open(int port)
{
#ifdef PC98
if (NKBDC) {
/* PC-98 has only one keyboard I/F */
kbdc_softc[0].port = port;
kbdc_softc[0].lock = FALSE;
return (KBDC)&kbdc_softc[0];
}
return NULL; /* You didn't include sc driver in your config file */
#else
int s;
int i;
s = spltty();
for (i = 0; i < NKBDC; ++i) {
if (kbdc_softc[i].port == port) {
splx(s);
return (KBDC) &kbdc_softc[i];
}
if (kbdc_softc[i].port <= 0) {
kbdc_softc[i].port = port;
kbdc_softc[i].command_byte = -1;
kbdc_softc[i].command_mask = 0;
kbdc_softc[i].lock = FALSE;
kbdc_softc[i].kbd.head = kbdc_softc[i].kbd.tail = 0;
kbdc_softc[i].aux.head = kbdc_softc[i].aux.tail = 0;
#if KBDIO_DEBUG >= 2
kbdc_softc[i].kbd.call_count = 0;
kbdc_softc[i].kbd.qcount = kbdc_softc[i].kbd.max_qcount = 0;
kbdc_softc[i].aux.call_count = 0;
kbdc_softc[i].aux.qcount = kbdc_softc[i].aux.max_qcount = 0;
#endif
splx(s);
return (KBDC) &kbdc_softc[i];
}
}
splx(s);
return NULL;
#endif
}
/*
* I/O access arbitration in `kbdio'
*
* The `kbdio' module uses a simplistic convention to arbitrate
* I/O access to the controller/keyboard/mouse. The convention requires
* close cooperation of the calling device driver.
*
* The device driver which utilizes the `kbdio' module are assumed to
* have the following set of routines.
* a. An interrupt handler (the bottom half of the driver).
* b. Timeout routines which may briefly polls the keyboard controller.
* c. Routines outside interrupt context (the top half of the driver).
* They should follow the rules below:
* 1. The interrupt handler may assume that it always has full access
* to the controller/keyboard/mouse.
* 2. The other routines must issue `spltty()' if they wish to
* prevent the interrupt handler from accessing
* the controller/keyboard/mouse.
* 3. The timeout routines and the top half routines of the device driver
* arbitrate I/O access by observing the lock flag in `kbdio'.
* The flag is manipulated via `kbdc_lock()'; when one wants to
* perform I/O, call `kbdc_lock(kbdc, TRUE)' and proceed only if
* the call returns with TRUE. Otherwise the caller must back off.
* Call `kbdc_lock(kbdc, FALSE)' when necessary I/O operaion
* is finished. This mechanism does not prevent the interrupt
* handler from being invoked at any time and carrying out I/O.
* Therefore, `spltty()' must be strategically placed in the device
* driver code. Also note that the timeout routine may interrupt
* `kbdc_lock()' called by the top half of the driver, but this
* interruption is OK so long as the timeout routine observes the
* the rule 4 below.
* 4. The interrupt and timeout routines should not extend I/O operation
* across more than one interrupt or timeout; they must complete
* necessary I/O operation within one invokation of the routine.
* This measns that if the timeout routine acquires the lock flag,
* it must reset the flag to FALSE before it returns.
*/
/* set/reset polling lock */
int
kbdc_lock(KBDC p, int lock)
{
int prevlock;
prevlock = kbdcp(p)->lock;
kbdcp(p)->lock = lock;
return (prevlock != lock);
}
/* check if any data is waiting to be processed */
int
kbdc_data_ready(KBDC p)
{
#ifdef PC98
return (inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL);
#else
return (availq(&kbdcp(p)->kbd) || availq(&kbdcp(p)->aux)
|| (inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL));
#endif
}
#ifndef PC98
/* queuing functions */
static int
addq(kqueue *q, int c)
{
if (nextq(q->tail) != q->head) {
q->q[q->tail] = c;
q->tail = nextq(q->tail);
#if KBDIO_DEBUG >= 2
++q->call_count;
++q->qcount;
if (q->qcount > q->max_qcount)
q->max_qcount = q->qcount;
#endif
return TRUE;
}
return FALSE;
}
static int
removeq(kqueue *q)
{
int c;
if (q->tail != q->head) {
c = q->q[q->head];
q->head = nextq(q->head);
#if KBDIO_DEBUG >= 2
--q->qcount;
#endif
return c;
}
return -1;
}
/*
* device I/O routines
*/
static int
wait_while_controller_busy(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 100msec at most */
int retry = 5000;
int port = kbdc->port;
int f;
while ((f = inb(port + KBD_STATUS_PORT)) & KBDS_INPUT_BUFFER_FULL) {
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->kbd, inb(port + KBD_DATA_PORT));
} else if ((f & KBDS_BUFFER_FULL) == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->aux, inb(port + KBD_DATA_PORT));
}
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
return FALSE;
}
return TRUE;
}
/*
* wait for any data; whether it's from the controller,
* the keyboard, or the aux device.
*/
static int
wait_for_data(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int port = kbdc->port;
int f;
while ((f = inb(port + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) == 0) {
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
return 0;
}
DELAY(KBDD_DELAYTIME);
return f;
}
#endif /* !PC98 */
/* wait for data from the keyboard */
static int
wait_for_kbd_data(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int port = kbdc->port;
int f;
while ((f = inb(port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL)
!= KBDS_KBD_BUFFER_FULL) {
#ifdef PC98
DELAY(KBDD_DELAYTIME);
#else
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->aux, inb(port + KBD_DATA_PORT));
}
#endif
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
return 0;
}
DELAY(KBDD_DELAYTIME);
return f;
}
#ifndef PC98
/*
* wait for an ACK(FAh), RESEND(FEh), or RESET_FAIL(FCh) from the keyboard.
* queue anything else.
*/
static int
wait_for_kbd_ack(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int port = kbdc->port;
int f;
int b;
while (retry-- > 0) {
if ((f = inb(port + KBD_STATUS_PORT)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = inb(port + KBD_DATA_PORT);
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
if ((b == KBD_ACK) || (b == KBD_RESEND)
|| (b == KBD_RESET_FAIL))
return b;
addq(&kbdc->kbd, b);
} else if ((f & KBDS_BUFFER_FULL) == KBDS_AUX_BUFFER_FULL) {
addq(&kbdc->aux, b);
}
}
DELAY(KBDC_DELAYTIME);
}
return -1;
}
/* wait for data from the aux device */
static int
wait_for_aux_data(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int port = kbdc->port;
int f;
while ((f = inb(port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL)
!= KBDS_AUX_BUFFER_FULL) {
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->kbd, inb(port + KBD_DATA_PORT));
}
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
return 0;
}
DELAY(KBDD_DELAYTIME);
return f;
}
/*
* wait for an ACK(FAh), RESEND(FEh), or RESET_FAIL(FCh) from the aux device.
* queue anything else.
*/
static int
wait_for_aux_ack(struct kbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int port = kbdc->port;
int f;
int b;
while (retry-- > 0) {
if ((f = inb(port + KBD_STATUS_PORT)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = inb(port + KBD_DATA_PORT);
if ((f & KBDS_BUFFER_FULL) == KBDS_AUX_BUFFER_FULL) {
if ((b == PSM_ACK) || (b == PSM_RESEND)
|| (b == PSM_RESET_FAIL))
return b;
addq(&kbdc->aux, b);
} else if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
addq(&kbdc->kbd, b);
}
}
DELAY(KBDC_DELAYTIME);
}
return -1;
}
/* write a one byte command to the controller */
int
write_controller_command(KBDC p, int c)
{
if (!wait_while_controller_busy(kbdcp(p)))
return FALSE;
outb(kbdcp(p)->port + KBD_COMMAND_PORT, c);
return TRUE;
}
/* write a one byte data to the controller */
int
write_controller_data(KBDC p, int c)
{
if (!wait_while_controller_busy(kbdcp(p)))
return FALSE;
outb(kbdcp(p)->port + KBD_DATA_PORT, c);
return TRUE;
}
/* write a one byte keyboard command */
int
write_kbd_command(KBDC p, int c)
{
if (!wait_while_controller_busy(kbdcp(p)))
return FALSE;
outb(kbdcp(p)->port + KBD_DATA_PORT, c);
return TRUE;
}
/* write a one byte auxiliary device command */
int
write_aux_command(KBDC p, int c)
{
if (!write_controller_command(p, KBDC_WRITE_TO_AUX))
return FALSE;
return write_controller_data(p, c);
}
/* send a command to the keyboard and wait for ACK */
int
send_kbd_command(KBDC p, int c)
{
int retry = KBD_MAXRETRY;
int res = -1;
while (retry-- > 0) {
if (!write_kbd_command(p, c))
continue;
res = wait_for_kbd_ack(kbdcp(p));
if (res == KBD_ACK)
break;
}
return res;
}
/* send a command to the auxiliary device and wait for ACK */
int
send_aux_command(KBDC p, int c)
{
int retry = KBD_MAXRETRY;
int res = -1;
while (retry-- > 0) {
if (!write_aux_command(p, c))
continue;
/*
* FIXME: XXX
* The aux device may have already sent one or two bytes of
* status data, when a command is received. It will immediately
* stop data transmission, thus, leaving an incomplete data
* packet in our buffer. We have to discard any unprocessed
* data in order to remove such packets. Well, we may remove
* unprocessed, but necessary data byte as well...
*/
emptyq(&kbdcp(p)->aux);
res = wait_for_aux_ack(kbdcp(p));
if (res == PSM_ACK)
break;
}
return res;
}
/* send a command and a data to the keyboard, wait for ACKs */
int
send_kbd_command_and_data(KBDC p, int c, int d)
{
int retry;
int res = -1;
for (retry = KBD_MAXRETRY; retry > 0; --retry) {
if (!write_kbd_command(p, c))
continue;
res = wait_for_kbd_ack(kbdcp(p));
if (res == KBD_ACK)
break;
else if (res != KBD_RESEND)
return res;
}
if (retry <= 0)
return res;
for (retry = KBD_MAXRETRY, res = -1; retry > 0; --retry) {
if (!write_kbd_command(p, d))
continue;
res = wait_for_kbd_ack(kbdcp(p));
if (res != KBD_RESEND)
break;
}
return res;
}
/* send a command and a data to the auxiliary device, wait for ACKs */
int
send_aux_command_and_data(KBDC p, int c, int d)
{
int retry;
int res = -1;
for (retry = KBD_MAXRETRY; retry > 0; --retry) {
if (!write_aux_command(p, c))
continue;
emptyq(&kbdcp(p)->aux);
res = wait_for_aux_ack(kbdcp(p));
if (res == PSM_ACK)
break;
else if (res != PSM_RESEND)
return res;
}
if (retry <= 0)
return res;
for (retry = KBD_MAXRETRY, res = -1; retry > 0; --retry) {
if (!write_aux_command(p, d))
continue;
res = wait_for_aux_ack(kbdcp(p));
if (res != PSM_RESEND)
break;
}
return res;
}
/*
* read one byte from any source; whether from the controller,
* the keyboard, or the aux device
*/
int
read_controller_data(KBDC p)
{
if (availq(&kbdcp(p)->kbd))
return removeq(&kbdcp(p)->kbd);
if (availq(&kbdcp(p)->aux))
return removeq(&kbdcp(p)->aux);
if (!wait_for_data(kbdcp(p)))
return -1; /* timeout */
return inb(kbdcp(p)->port + KBD_DATA_PORT);
}
#endif /* !PC98 */
#if KBDIO_DEBUG >= 2
static int call = 0;
#endif
/* read one byte from the keyboard */
int
read_kbd_data(KBDC p)
{
#ifndef PC98
#if KBDIO_DEBUG >= 2
if (++call > 2000) {
call = 0;
log(LOG_DEBUG, "KBDIO: kbd q: %d calls, max %d chars, "
"aux q: %d calls, max %d chars\n",
kbdcp(p)->kbd.call_count, kbdcp(p)->kbd.max_qcount,
kbdcp(p)->aux.call_count, kbdcp(p)->aux.max_qcount);
}
#endif
if (availq(&kbdcp(p)->kbd))
return removeq(&kbdcp(p)->kbd);
#endif /* !PC98 */
if (!wait_for_kbd_data(kbdcp(p)))
return -1; /* timeout */
#ifdef PC98
DELAY(KBDC_DELAYTIME);
#endif
return inb(kbdcp(p)->port + KBD_DATA_PORT);
}
/* read one byte from the keyboard, but return immediately if
* no data is waiting
*/
int
read_kbd_data_no_wait(KBDC p)
{
int f;
#ifdef PC98
f = inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL;
#else
#if KBDIO_DEBUG >= 2
if (++call > 2000) {
call = 0;
log(LOG_DEBUG, "KBDIO: kbd q: %d calls, max %d chars, "
"aux q: %d calls, max %d chars\n",
kbdcp(p)->kbd.call_count, kbdcp(p)->kbd.max_qcount,
kbdcp(p)->aux.call_count, kbdcp(p)->aux.max_qcount);
}
#endif
if (availq(&kbdcp(p)->kbd))
return removeq(&kbdcp(p)->kbd);
f = inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL;
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdcp(p)->aux, inb(kbdcp(p)->port + KBD_DATA_PORT));
f = inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL;
}
#endif /* PC98 */
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
return inb(kbdcp(p)->port + KBD_DATA_PORT);
}
return -1; /* no data */
}
#ifndef PC98
/* read one byte from the aux device */
int
read_aux_data(KBDC p)
{
if (availq(&kbdcp(p)->aux))
return removeq(&kbdcp(p)->aux);
if (!wait_for_aux_data(kbdcp(p)))
return -1; /* timeout */
return inb(kbdcp(p)->port + KBD_DATA_PORT);
}
/* read one byte from the aux device, but return immediately if
* no data is waiting
*/
int
read_aux_data_no_wait(KBDC p)
{
int f;
if (availq(&kbdcp(p)->aux))
return removeq(&kbdcp(p)->aux);
f = inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL;
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdcp(p)->kbd, inb(kbdcp(p)->port + KBD_DATA_PORT));
f = inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL;
}
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
return inb(kbdcp(p)->port + KBD_DATA_PORT);
}
return -1; /* no data */
}
/* discard data from the keyboard */
void
empty_kbd_buffer(KBDC p, int wait)
{
int t;
int b;
int f;
#if KBDIO_DEBUG >= 2
int c1 = 0;
int c2 = 0;
#endif
int delta = 2;
for (t = wait; t > 0; ) {
if ((f = inb(kbdcp(p)->port + KBD_STATUS_PORT)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = inb(kbdcp(p)->port + KBD_DATA_PORT);
if ((f & KBDS_BUFFER_FULL) == KBDS_AUX_BUFFER_FULL) {
addq(&kbdcp(p)->aux, b);
#if KBDIO_DEBUG >= 2
++c2;
} else {
++c1;
#endif
}
t = wait;
} else {
t -= delta;
}
DELAY(delta*1000);
}
#if KBDIO_DEBUG >= 2
if ((c1 > 0) || (c2 > 0))
log(LOG_DEBUG, "kbdio: %d:%d char read (empty_kbd_buffer)\n", c1, c2);
#endif
emptyq(&kbdcp(p)->kbd);
}
/* discard data from the aux device */
void
empty_aux_buffer(KBDC p, int wait)
{
int t;
int b;
int f;
#if KBDIO_DEBUG >= 2
int c1 = 0;
int c2 = 0;
#endif
int delta = 2;
for (t = wait; t > 0; ) {
if ((f = inb(kbdcp(p)->port + KBD_STATUS_PORT)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = inb(kbdcp(p)->port + KBD_DATA_PORT);
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
addq(&kbdcp(p)->kbd, b);
#if KBDIO_DEBUG >= 2
++c1;
} else {
++c2;
#endif
}
t = wait;
} else {
t -= delta;
}
DELAY(delta*1000);
}
#if KBDIO_DEBUG >= 2
if ((c1 > 0) || (c2 > 0))
log(LOG_DEBUG, "kbdio: %d:%d char read (empty_aux_buffer)\n", c1, c2);
#endif
emptyq(&kbdcp(p)->aux);
}
/* discard any data from the keyboard or the aux device */
void
empty_both_buffers(KBDC p, int wait)
{
int t;
int f;
#if KBDIO_DEBUG >= 2
int c1 = 0;
int c2 = 0;
#endif
int delta = 2;
for (t = wait; t > 0; ) {
if ((f = inb(kbdcp(p)->port + KBD_STATUS_PORT)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
(void)inb(kbdcp(p)->port + KBD_DATA_PORT);
#if KBDIO_DEBUG >= 2
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL)
++c1;
else
++c2;
#endif
t = wait;
} else {
t -= delta;
}
DELAY(delta*1000);
}
#if KBDIO_DEBUG >= 2
if ((c1 > 0) || (c2 > 0))
log(LOG_DEBUG, "kbdio: %d:%d char read (empty_both_buffers)\n", c1, c2);
#endif
emptyq(&kbdcp(p)->kbd);
emptyq(&kbdcp(p)->aux);
}
/* keyboard and mouse device control */
/* NOTE: enable the keyboard port but disable the keyboard
* interrupt before calling "reset_kbd()".
*/
int
reset_kbd(KBDC p)
{
int retry = KBD_MAXRETRY;
int again = KBD_MAXWAIT;
int c = KBD_RESEND; /* keep the compiler happy */
while (retry-- > 0) {
empty_both_buffers(p, 10);
if (!write_kbd_command(p, KBDC_RESET_KBD))
continue;
emptyq(&kbdcp(p)->kbd);
c = read_controller_data(p);
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: RESET_KBD return code:%04x\n", c);
if (c == KBD_ACK) /* keyboard has agreed to reset itself... */
break;
}
if (retry < 0)
return FALSE;
while (again-- > 0) {
/* wait awhile, well, in fact we must wait quite loooooooooooong */
DELAY(KBD_RESETDELAY*1000);
c = read_controller_data(p); /* RESET_DONE/RESET_FAIL */
if (c != -1) /* wait again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: RESET_KBD status:%04x\n", c);
if (c != KBD_RESET_DONE)
return FALSE;
return TRUE;
}
/* NOTE: enable the aux port but disable the aux interrupt
* before calling `reset_aux_dev()'.
*/
int
reset_aux_dev(KBDC p)
{
int retry = KBD_MAXRETRY;
int again = KBD_MAXWAIT;
int c = PSM_RESEND; /* keep the compiler happy */
while (retry-- > 0) {
empty_both_buffers(p, 10);
if (!write_aux_command(p, PSMC_RESET_DEV))
continue;
emptyq(&kbdcp(p)->aux);
c = read_aux_data(p);
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: RESET_AUX return code:%04x\n", c);
if (c == PSM_ACK) /* aux dev is about to reset... */
break;
}
if (retry < 0)
return FALSE;
while (again-- > 0) {
/* wait awhile, well, quite looooooooooooong */
DELAY(KBD_RESETDELAY*1000);
c = read_aux_data(p); /* RESET_DONE/RESET_FAIL */
if (c != -1) /* wait again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: RESET_AUX status:%04x\n", c);
if (c != PSM_RESET_DONE) /* reset status */
return FALSE;
c = read_aux_data(p); /* device ID */
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: RESET_AUX ID:%04x\n", c);
/* NOTE: we could check the device ID now, but leave it later... */
return TRUE;
}
/* controller diagnostics and setup */
int
test_controller(KBDC p)
{
int retry = KBD_MAXRETRY;
int again = KBD_MAXWAIT;
int c = KBD_DIAG_FAIL;
while (retry-- > 0) {
empty_both_buffers(p, 10);
if (write_controller_command(p, KBDC_DIAGNOSE))
break;
}
if (retry < 0)
return FALSE;
emptyq(&kbdcp(p)->kbd);
while (again-- > 0) {
/* wait awhile */
DELAY(KBD_RESETDELAY*1000);
c = read_controller_data(p); /* DIAG_DONE/DIAG_FAIL */
if (c != -1) /* wait again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: DIAGNOSE status:%04x\n", c);
return (c == KBD_DIAG_DONE);
}
int
test_kbd_port(KBDC p)
{
int retry = KBD_MAXRETRY;
int again = KBD_MAXWAIT;
int c = -1;
while (retry-- > 0) {
empty_both_buffers(p, 10);
if (write_controller_command(p, KBDC_TEST_KBD_PORT))
break;
}
if (retry < 0)
return FALSE;
emptyq(&kbdcp(p)->kbd);
while (again-- > 0) {
c = read_controller_data(p);
if (c != -1) /* try again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: TEST_KBD_PORT status:%04x\n", c);
return c;
}
int
test_aux_port(KBDC p)
{
int retry = KBD_MAXRETRY;
int again = KBD_MAXWAIT;
int c = -1;
while (retry-- > 0) {
empty_both_buffers(p, 10);
if (write_controller_command(p, KBDC_TEST_AUX_PORT))
break;
}
if (retry < 0)
return FALSE;
emptyq(&kbdcp(p)->kbd);
while (again-- > 0) {
c = read_controller_data(p);
if (c != -1) /* try again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: TEST_AUX_PORT status:%04x\n", c);
return c;
}
int
kbdc_get_device_mask(KBDC p)
{
return kbdcp(p)->command_mask;
}
void
kbdc_set_device_mask(KBDC p, int mask)
{
kbdcp(p)->command_mask =
mask & (KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS);
}
int
get_controller_command_byte(KBDC p)
{
if (kbdcp(p)->command_byte != -1)
return kbdcp(p)->command_byte;
if (!write_controller_command(p, KBDC_GET_COMMAND_BYTE))
return -1;
emptyq(&kbdcp(p)->kbd);
kbdcp(p)->command_byte = read_controller_data(p);
return kbdcp(p)->command_byte;
}
int
set_controller_command_byte(KBDC p, int mask, int command)
{
if (get_controller_command_byte(p) == -1)
return FALSE;
command = (kbdcp(p)->command_byte & ~mask) | (command & mask);
#if 0
if (command == kbdcp(p)->command_byte)
return TRUE;
#endif
if (command & KBD_DISABLE_KBD_PORT) {
if (!write_controller_command(p, KBDC_DISABLE_KBD_PORT))
return FALSE;
}
if (!write_controller_command(p, KBDC_SET_COMMAND_BYTE))
return FALSE;
if (!write_controller_data(p, command))
return FALSE;
kbdcp(p)->command_byte = command;
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdio: new command byte:%04x (set_controller...)\n",
command);
return TRUE;
}
#endif /* !PC98 */
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