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freebsd-skq/sys/dev/atkbdc/atkbdc.c
sobomax 06a2ddb54d On certain chipsets AT keyboard controller isn't present and is 
emulated by BIOS using SMI interrupt. On those chipsets reading
from the status port may be thousand times slower than usually.
Sometimes this emilation is not working properly resulting in
commands timing out and since we assume that inb() operation
takes very little time to complete we need to adjust number of
retries to keep waiting time within a designed limits (100ms).
Measure time it takes to make read_status() call and adjust
number of retries accordingly.

To keep it simple, use TSC to measure inb() performance and
keep it to amd64-only, since TSC may not available on older
CPUs.

Also enable detection of the AT controller absence on amd64.

Reviewed by:	jhb
MFC after:	1 month
2010-04-29 06:16:00 +00:00

1169 lines
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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>
#if defined(__amd64__)
#include <machine/clock.h>
#endif
#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__) || defined(__amd64__)
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__) || defined(__amd64__)
/*
* 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 defined(__amd64__)
u_int64_t tscval[3], read_delay;
register_t flags;
#endif
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;
#if defined(__amd64__)
/*
* On certain chipsets AT keyboard controller isn't present and is
* emulated by BIOS using SMI interrupt. On those chipsets reading
* from the status port may be thousand times slower than usually.
* Sometimes this emilation is not working properly resulting in
* commands timing our and since we assume that inb() operation
* takes very little time to complete we need to adjust number of
* retries to keep waiting time within a designed limits (100ms).
* Measure time it takes to make read_status() call and adjust
* number of retries accordingly.
*/
flags = intr_disable();
tscval[0] = rdtsc();
read_status(sc);
tscval[1] = rdtsc();
DELAY(1000);
tscval[2] = rdtsc();
intr_restore(flags);
read_delay = tscval[1] - tscval[0];
read_delay /= (tscval[2] - tscval[1]) / 1000;
sc->retry = 100000 / ((KBDD_DELAYTIME * 2) + read_delay);
#else
sc->retry = 5000;
#endif
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)
{
int retry;
int f;
/* CPU will stay inside the loop for 100msec at most */
retry = kbdc->retry;
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)
{
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
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)
{
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
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)
{
int retry;
int f;
int b;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
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)
{
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
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)
{
int retry;
int f;
int b;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
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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