NetBSD-5.0.2/sys/dev/isa/weasel_isa.c
/* $NetBSD: weasel_isa.c,v 1.5 2008/04/08 20:08:50 cegger Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
* All rights reserved.
*
* Author: Jason R. Thorpe <thorpej@zembu.com>
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Zembu Labs, Inc.
* 4. Neither the name of Zembu Labs nor the names of its employees may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
* RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
* CLAIMED. IN NO EVENT SHALL ZEMBU LABS 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.
*/
/*
* Device driver for the Middle Digital, Inc. PC-Weasel serial
* console board.
*
* We're glued into the MDA display driver (`pcdisplay'), and
* handle things like the watchdog timer.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: weasel_isa.c,v 1.5 2008/04/08 20:08:50 cegger Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/wdog.h>
#include <sys/bus.h>
#include <dev/isa/weaselreg.h>
#include <dev/isa/weaselvar.h>
#include <dev/sysmon/sysmonvar.h>
int weasel_isa_wdog_setmode(struct sysmon_wdog *);
int weasel_isa_wdog_tickle(struct sysmon_wdog *);
int weasel_isa_wdog_arm_disarm(struct weasel_handle *, u_int8_t);
int weasel_isa_wdog_query_state(struct weasel_handle *);
void pcweaselattach(int);
/* ARGSUSED */
void
pcweaselattach(int count)
{
/* Nothing to do; pseudo-device glue. */
}
void
weasel_isa_init(struct weasel_handle *wh)
{
struct weasel_config_block cfg;
int i, j;
u_int8_t *cp, sum;
const char *vers, *mode;
/*
* Write a NOP to the command register and see if it
* reverts back to READY within 1.5 seconds.
*/
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND, OS_NOP);
for (i = 0; i < 1500; i++) {
delay(1000);
sum = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND);
if (sum == OS_READY)
break;
}
if (sum != OS_READY) {
/* This is not a Weasel. */
return;
}
/*
* It can take a while for the config block to be copied
* into the offscreen area, as the Weasel may be busy
* sending data to the terminal. Wait up to 3 seconds,
* reading the block each time, and breaking out of the
* loop once the checksum passes.
*/
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND,
OS_CONFIG_COPY);
/* ...one second to get it started... */
delay(1000 * 1000);
/* ...two seconds to let it finish... */
for (i = 0; i < 2000; i++) {
delay(1000);
bus_space_read_region_1(wh->wh_st, wh->wh_sh,
WEASEL_CONFIG_BLOCK, &cfg, sizeof(cfg));
/*
* Compute the checksum of the config block.
*/
for (cp = (u_int8_t *)&cfg, j = 0, sum = 1;
j < (sizeof(cfg) - 1); j++)
sum += cp[j];
if (sum == cfg.cksum)
break;
}
if (sum != cfg.cksum) {
/*
* Checksum doesn't match; either it's not a Weasel,
* or something is wrong with it.
*/
printf("%s: PC-Weasel config block checksum mismatch "
"0x%02x != 0x%02x\n", device_xname(wh->wh_parent),
sum, cfg.cksum);
return;
}
switch (cfg.cfg_version) {
case CFG_VERSION_1_0:
vers = "1.0";
switch (cfg.enable_duart_switching) {
case 0:
mode = "emulation";
break;
case 1:
mode = "autoswitch";
break;
default:
mode = "unknown";
}
break;
case CFG_VERSION_1_1:
vers = "1.1";
switch (cfg.enable_duart_switching) {
case 0:
mode = "emulation";
break;
case 1:
mode = "serial";
break;
case 2:
mode = "autoswitch";
break;
default:
mode = "unknown";
}
break;
default:
vers = mode = NULL;
}
printf("%s: PC-Weasel, ", device_xname(wh->wh_parent));
if (vers != NULL)
printf("version %s, %s mode", vers, mode);
else
printf("unknown version 0x%x", cfg.cfg_version);
printf("\n");
printf("%s: break passthrough %s", device_xname(wh->wh_parent),
cfg.break_passthru ? "enabled" : "disabled");
if (cfg.wdt_msec == 0) {
/*
* Old firmware -- these Weasels have
* a 3000ms watchdog period.
*/
cfg.wdt_msec = 3000;
}
if ((wh->wh_wdog_armed = weasel_isa_wdog_query_state(wh)) == -1)
wh->wh_wdog_armed = 0;
wh->wh_wdog_period = cfg.wdt_msec / 1000;
printf(", watchdog interval %d sec.\n", wh->wh_wdog_period);
/*
* Always register the Weasel watchdog timer in case user decides
* to set 'allow watchdog' to 'YES' after the machine has booted.
*/
wh->wh_smw.smw_name = "weasel";
wh->wh_smw.smw_cookie = wh;
wh->wh_smw.smw_setmode = weasel_isa_wdog_setmode;
wh->wh_smw.smw_tickle = weasel_isa_wdog_tickle;
wh->wh_smw.smw_period = wh->wh_wdog_period;
if (sysmon_wdog_register(&wh->wh_smw) != 0)
aprint_error_dev(wh->wh_parent, "unable to register PC-Weasel watchdog "
"with sysmon\n");
}
int
weasel_isa_wdog_setmode(struct sysmon_wdog *smw)
{
struct weasel_handle *wh = smw->smw_cookie;
int error = 0;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
error = weasel_isa_wdog_arm_disarm(wh, WDT_DISABLE);
} else {
if (smw->smw_period == WDOG_PERIOD_DEFAULT)
smw->smw_period = wh->wh_wdog_period;
else if (smw->smw_period != wh->wh_wdog_period) {
/* Can't change the period on the Weasel. */
return (EINVAL);
}
error = weasel_isa_wdog_arm_disarm(wh, WDT_ENABLE);
weasel_isa_wdog_tickle(smw);
}
return (error);
}
int
weasel_isa_wdog_tickle(struct sysmon_wdog *smw)
{
struct weasel_handle *wh = smw->smw_cookie;
u_int8_t reg;
int x;
int s;
int error = 0;
s = splhigh();
/*
* first we tickle the watchdog
*/
reg = bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE);
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE, ~reg);
/*
* then we check to make sure the weasel is still armed. If someone
* has rebooted the weasel for whatever reason (firmware update),
* then the watchdog timer would no longer be armed and we'd be
* servicing nothing. Let the user know that the machine is no
* longer being monitored by the weasel.
*/
if((x = weasel_isa_wdog_query_state(wh)) == -1)
error = EIO;
if (x == 1) {
error = 0;
} else {
aprint_error_dev(wh->wh_parent, "Watchdog timer disabled on PC/Weasel! Disarming wdog.\n");
wh->wh_wdog_armed = 0;
error = 1;
}
splx(s);
return (error);
}
int
weasel_isa_wdog_arm_disarm(struct weasel_handle *wh, u_int8_t mode)
{
u_int8_t reg;
int timeout;
int s, x;
int error = 0;
s = splhigh();
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE,
WDT_ATTENTION);
for (timeout = 5000; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == WDT_OK)
break;
}
if (timeout == 0) {
splx(s);
return(EIO);
}
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, mode);
for (timeout = 500 ; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg != mode)
break;
}
if (timeout == 0) {
splx(s);
return(EIO);
}
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, ~reg);
for (timeout = 500; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == WDT_OK)
break;
}
/*
* Ensure that the Weasel thinks it's in the same mode we want it to
* be in. EIO if not.
*/
x = weasel_isa_wdog_query_state(wh);
switch (x) {
case -1:
error = EIO;
break;
case 0:
if (mode == WDT_DISABLE) {
wh->wh_wdog_armed = 0;
error = 0;
} else
error = EIO;
break;
case 1:
if (mode == WDT_ENABLE) {
wh->wh_wdog_armed = 1;
error = 0;
} else
error = EIO;
break;
}
splx(s);
return(error);
}
int
weasel_isa_wdog_query_state(struct weasel_handle *wh)
{
int timeout, reg;
bus_space_write_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND, OS_WDT_QUERY);
for (timeout = 0; timeout < 1500; timeout++) {
delay(1000);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND);
if (reg == OS_READY)
break;
}
return(bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_RESPONSE));
}