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freebsd/sys/dev/atkbdc/atkbdc.c
Doug White 9aeef36608 Avoid an infinite loop in empty_both_buffers() by adding a timeout. 
This helps systems that don't actually have atkbd controllers, such as the Intel
SBX82 blade, boot without device.hints hacks.

Hardware for this fix provided by iXsystems.

PR:		94822
Submitted by:	Devon H. O'Dell <devon.odell@coyotepoint.com>
MFC After:	3 days
2006-09-04 00:19:31 +00:00

1121 lines
28 KiB
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/*-
* Copyright (c) 1996-1999
* 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 AUTHOR 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 AUTHOR 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.
*
* from kbdio.c,v 1.13 1998/09/25 11:55:46 yokota Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_kbd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/atkbdc/atkbdcreg.h>
#ifdef __sparc64__
#include <dev/ofw/openfirm.h>
#include <machine/bus_private.h>
#include <machine/ofw_machdep.h>
#else
#include <isa/isareg.h>
#endif
/* constants */
#define MAXKBDC 1 /* XXX */
/* macros */
#ifndef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#endif
#define kbdcp(p) ((atkbdc_softc_t *)(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
#define read_data(k) (bus_space_read_1((k)->iot, (k)->ioh0, 0))
#define read_status(k) (bus_space_read_1((k)->iot, (k)->ioh1, 0))
#define write_data(k, d) \
(bus_space_write_1((k)->iot, (k)->ioh0, 0, (d)))
#define write_command(k, d) \
(bus_space_write_1((k)->iot, (k)->ioh1, 0, (d)))
/* local variables */
/*
* We always need at least one copy of the kbdc_softc struct for the
* low-level console. As the low-level console accesses the keyboard
* controller before kbdc, and all other devices, is probed, we
* statically allocate one entry. XXX
*/
static atkbdc_softc_t default_kbdc;
static atkbdc_softc_t *atkbdc_softc[MAXKBDC] = { &default_kbdc };
static int verbose = KBDIO_DEBUG;
#ifdef __sparc64__
static struct bus_space_tag atkbdc_bst_store[MAXKBDC];
#endif
/* function prototypes */
static int atkbdc_setup(atkbdc_softc_t *sc, bus_space_tag_t tag,
bus_space_handle_t h0, bus_space_handle_t h1);
static int addq(kqueue *q, int c);
static int removeq(kqueue *q);
static int wait_while_controller_busy(atkbdc_softc_t *kbdc);
static int wait_for_data(atkbdc_softc_t *kbdc);
static int wait_for_kbd_data(atkbdc_softc_t *kbdc);
static int wait_for_kbd_ack(atkbdc_softc_t *kbdc);
static int wait_for_aux_data(atkbdc_softc_t *kbdc);
static int wait_for_aux_ack(atkbdc_softc_t *kbdc);
atkbdc_softc_t
*atkbdc_get_softc(int unit)
{
atkbdc_softc_t *sc;
if (unit >= sizeof(atkbdc_softc)/sizeof(atkbdc_softc[0]))
return NULL;
sc = atkbdc_softc[unit];
if (sc == NULL) {
sc = atkbdc_softc[unit]
= malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT | M_ZERO);
if (sc == NULL)
return NULL;
}
return sc;
}
int
atkbdc_probe_unit(int unit, struct resource *port0, struct resource *port1)
{
if (rman_get_start(port0) <= 0)
return ENXIO;
if (rman_get_start(port1) <= 0)
return ENXIO;
return 0;
}
int
atkbdc_attach_unit(int unit, atkbdc_softc_t *sc, struct resource *port0,
struct resource *port1)
{
return atkbdc_setup(sc, rman_get_bustag(port0),
rman_get_bushandle(port0),
rman_get_bushandle(port1));
}
/* the backdoor to the keyboard controller! XXX */
int
atkbdc_configure(void)
{
bus_space_tag_t tag;
bus_space_handle_t h0;
bus_space_handle_t h1;
#if defined(__i386__)
volatile int i;
register_t flags;
#endif
#ifdef __sparc64__
char name[32];
phandle_t chosen, node;
ihandle_t stdin;
bus_addr_t port0;
bus_addr_t port1;
int space;
#else
int port0;
int port1;
#endif
/* XXX: tag should be passed from the caller */
#if defined(__i386__)
tag = I386_BUS_SPACE_IO;
#elif defined(__amd64__)
tag = AMD64_BUS_SPACE_IO;
#elif defined(__ia64__)
tag = IA64_BUS_SPACE_IO;
#elif defined(__sparc64__)
tag = &atkbdc_bst_store[0];
#else
#error "define tag!"
#endif
#ifdef __sparc64__
if ((chosen = OF_finddevice("/chosen")) == -1)
return 0;
if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1)
return 0;
if ((node = OF_instance_to_package(stdin)) == -1)
return 0;
if (OF_getprop(node, "name", name, sizeof(name)) == -1)
return 0;
name[sizeof(name) - 1] = '\0';
if (strcmp(name, "kb_ps2") != 0)
return 0;
/*
* The stdin handle points to an instance of a PS/2 keyboard
* package but we want the 8042 controller, which is the parent
* of that keyboard node.
*/
if ((node = OF_parent(node)) == 0)
return 0;
if (OF_decode_addr(node, 0, &space, &port0) != 0)
return 0;
h0 = sparc64_fake_bustag(space, port0, tag);
bus_space_subregion(tag, h0, KBD_DATA_PORT, 1, &h0);
if (OF_decode_addr(node, 1, &space, &port1) != 0)
return 0;
h1 = sparc64_fake_bustag(space, port1, tag);
bus_space_subregion(tag, h1, KBD_STATUS_PORT, 1, &h1);
#else
port0 = IO_KBD;
resource_int_value("atkbdc", 0, "port", &port0);
port1 = IO_KBD + KBD_STATUS_PORT;
#ifdef notyet
bus_space_map(tag, port0, IO_KBDSIZE, 0, &h0);
bus_space_map(tag, port1, IO_KBDSIZE, 0, &h1);
#else
h0 = (bus_space_handle_t)port0;
h1 = (bus_space_handle_t)port1;
#endif
#endif
#if defined(__i386__)
/*
* Check if we really have AT keyboard controller. Poll status
* register until we get "all clear" indication. If no such
* indication comes, it probably means that there is no AT
* keyboard controller present. Give up in such case. Check relies
* on the fact that reading from non-existing in/out port returns
* 0xff on i386. May or may not be true on other platforms.
*/
flags = intr_disable();
for (i = 0; i != 65535; i++) {
if ((bus_space_read_1(tag, h1, 0) & 0x2) == 0)
break;
}
intr_restore(flags);
if (i == 65535)
return ENXIO;
#endif
return atkbdc_setup(atkbdc_softc[0], tag, h0, h1);
}
static int
atkbdc_setup(atkbdc_softc_t *sc, bus_space_tag_t tag, bus_space_handle_t h0,
bus_space_handle_t h1)
{
if (sc->ioh0 == 0) { /* XXX */
sc->command_byte = -1;
sc->command_mask = 0;
sc->lock = FALSE;
sc->kbd.head = sc->kbd.tail = 0;
sc->aux.head = sc->aux.tail = 0;
#if KBDIO_DEBUG >= 2
sc->kbd.call_count = 0;
sc->kbd.qcount = sc->kbd.max_qcount = 0;
sc->aux.call_count = 0;
sc->aux.qcount = sc->aux.max_qcount = 0;
#endif
}
sc->iot = tag;
sc->ioh0 = h0;
sc->ioh1 = h1;
return 0;
}
/* open a keyboard controller */
KBDC
atkbdc_open(int unit)
{
if (unit <= 0)
unit = 0;
if (unit >= MAXKBDC)
return NULL;
if ((atkbdc_softc[unit]->port0 != NULL)
|| (atkbdc_softc[unit]->ioh0 != 0)) /* XXX */
return (KBDC)atkbdc_softc[unit];
return NULL;
}
/*
* 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 drivers which utilize 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 poll 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
* 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 any
* necessary I/O operation within one invocation of the routine.
* This means 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)
{
return (availq(&kbdcp(p)->kbd) || availq(&kbdcp(p)->aux)
|| (read_status(kbdcp(p)) & KBDS_ANY_BUFFER_FULL));
}
/* 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 atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 100msec at most */
int retry = 5000;
int f;
while ((f = read_status(kbdc)) & KBDS_INPUT_BUFFER_FULL) {
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->kbd, read_data(kbdc));
} else if ((f & KBDS_BUFFER_FULL) == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->aux, read_data(kbdc));
}
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 atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int f;
while ((f = read_status(kbdc) & KBDS_ANY_BUFFER_FULL) == 0) {
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
return 0;
}
DELAY(KBDD_DELAYTIME);
return f;
}
/* wait for data from the keyboard */
static int
wait_for_kbd_data(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int f;
while ((f = read_status(kbdc) & KBDS_BUFFER_FULL)
!= KBDS_KBD_BUFFER_FULL) {
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->aux, read_data(kbdc));
}
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 keyboard.
* queue anything else.
*/
static int
wait_for_kbd_ack(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int f;
int b;
while (retry-- > 0) {
if ((f = read_status(kbdc)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = read_data(kbdc);
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 atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int f;
while ((f = read_status(kbdc) & KBDS_BUFFER_FULL)
!= KBDS_AUX_BUFFER_FULL) {
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdc->kbd, read_data(kbdc));
}
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 atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int f;
int b;
while (retry-- > 0) {
if ((f = read_status(kbdc)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = read_data(kbdc);
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;
write_command(kbdcp(p), 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;
write_data(kbdcp(p), 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;
write_data(kbdcp(p), 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 read_data(kbdcp(p));
}
#if KBDIO_DEBUG >= 2
static int call = 0;
#endif
/* read one byte from the keyboard */
int
read_kbd_data(KBDC p)
{
#if KBDIO_DEBUG >= 2
if (++call > 2000) {
call = 0;
log(LOG_DEBUG, "kbdc: 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);
if (!wait_for_kbd_data(kbdcp(p)))
return -1; /* timeout */
return read_data(kbdcp(p));
}
/* read one byte from the keyboard, but return immediately if
* no data is waiting
*/
int
read_kbd_data_no_wait(KBDC p)
{
int f;
#if KBDIO_DEBUG >= 2
if (++call > 2000) {
call = 0;
log(LOG_DEBUG, "kbdc: 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 = read_status(kbdcp(p)) & KBDS_BUFFER_FULL;
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdcp(p)->aux, read_data(kbdcp(p)));
f = read_status(kbdcp(p)) & KBDS_BUFFER_FULL;
}
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
return read_data(kbdcp(p));
}
return -1; /* no data */
}
/* 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 read_data(kbdcp(p));
}
/* 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 = read_status(kbdcp(p)) & KBDS_BUFFER_FULL;
if (f == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
addq(&kbdcp(p)->kbd, read_data(kbdcp(p)));
f = read_status(kbdcp(p)) & KBDS_BUFFER_FULL;
}
if (f == KBDS_AUX_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
return read_data(kbdcp(p));
}
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 = read_status(kbdcp(p))) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = read_data(kbdcp(p));
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, "kbdc: %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 = read_status(kbdcp(p))) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
b = read_data(kbdcp(p));
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, "kbdc: %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;
int waited = 0;
#if KBDIO_DEBUG >= 2
int c1 = 0;
int c2 = 0;
#endif
int delta = 2;
for (t = wait; t > 0; ) {
if ((f = read_status(kbdcp(p))) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
(void)read_data(kbdcp(p));
#if KBDIO_DEBUG >= 2
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL)
++c1;
else
++c2;
#endif
t = wait;
} else {
t -= delta;
}
/*
* Some systems (Intel/IBM blades) do not have keyboard devices and
* will thus hang in this procedure. Time out after delta seconds to
* avoid this hang -- the keyboard attach will fail later on.
*/
waited += (delta * 1000);
if (waited == (delta * 1000000))
return;
DELAY(delta*1000);
}
#if KBDIO_DEBUG >= 2
if ((c1 > 0) || (c2 > 0))
log(LOG_DEBUG, "kbdc: %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, "kbdc: 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, "kbdc: 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);
/* NOTE: Compaq Armada laptops require extra delay here. XXX */
for (again = KBD_MAXWAIT; again > 0; --again) {
DELAY(KBD_RESETDELAY*1000);
c = read_aux_data_no_wait(p);
if (c != -1)
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdc: RESET_AUX return code:%04x\n", c);
if (c == PSM_ACK) /* aux dev is about to reset... */
break;
}
if (retry < 0)
return FALSE;
for (again = KBD_MAXWAIT; again > 0; --again) {
/* wait awhile, well, quite looooooooooooong */
DELAY(KBD_RESETDELAY*1000);
c = read_aux_data_no_wait(p); /* RESET_DONE/RESET_FAIL */
if (c != -1) /* wait again if the controller is not ready */
break;
}
if (verbose || bootverbose)
log(LOG_DEBUG, "kbdc: 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, "kbdc: 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, "kbdc: 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, "kbdc: 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, "kbdc: 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 (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)
log(LOG_DEBUG, "kbdc: new command byte:%04x (set_controller...)\n",
command);
return TRUE;
}
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