NetBSD/sys/dev/isa/weasel.c

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/* $NetBSD: weasel.c,v 1.1 2000/11/04 18:47:20 thorpej 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/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/wdog.h>
#include <machine/bus.h>
#include <dev/isa/weaselreg.h>
#include <dev/isa/weaselvar.h>
#include <dev/sysmon/sysmonvar.h>
int weasel_wdog_setmode(struct sysmon_wdog *);
int weasel_wdog_tickle(struct sysmon_wdog *);
int weasel_wdog_toggle(struct weasel_handle *);
void pcweaselattach(int);
/* ARGSUSED */
void
pcweaselattach(int count)
{
/* Nothing to do; pseudo-device glue. */
}
void
weasel_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", wh->wh_parent->dv_xname,
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, ", wh->wh_parent->dv_xname);
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", wh->wh_parent->dv_xname,
cfg.break_passthru ? "enabled" : "disabled");
if (cfg.wdt_allow) {
if (cfg.wdt_msec == 0) {
/*
* Old firmware -- these Weasels have
* a 3000ms watchdog period.
*/
cfg.wdt_msec = 3000;
}
/*
* There's no way to determine what mode the watchdog
* is in, but we can safely assume that it starts off
* disarmed.
*/
wh->wh_wdog_armed = 0;
wh->wh_wdog_period = cfg.wdt_msec / 1000;
printf(", watchdog interval %d sec.", wh->wh_wdog_period);
}
printf("\n");
if (cfg.wdt_allow) {
wh->wh_smw.smw_name = "weasel";
wh->wh_smw.smw_cookie = wh;
wh->wh_smw.smw_setmode = weasel_wdog_setmode;
wh->wh_smw.smw_tickle = weasel_wdog_tickle;
wh->wh_smw.smw_period = wh->wh_wdog_period;
if (sysmon_wdog_register(&wh->wh_smw) != 0)
printf("%s: unable to register PC-Weasel watchdog "
"with sysmon\n", wh->wh_parent->dv_xname);
}
}
int
weasel_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) {
if (wh->wh_wdog_armed)
error = weasel_wdog_toggle(wh);
} 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);
}
if (wh->wh_wdog_armed == 0)
error = weasel_wdog_toggle(wh);
else
weasel_wdog_tickle(smw);
}
return (error);
}
int
weasel_wdog_tickle(struct sysmon_wdog *smw)
{
struct weasel_handle *wh = smw->smw_cookie;
u_int8_t reg;
int s;
s = splhigh();
reg = bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE);
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, ~reg);
splx(s);
return (0);
}
int
weasel_wdog_toggle(struct weasel_handle *wh)
{
u_int8_t reg;
int i, s, new_state, error = 0;
s = splhigh();
for (i = 0, new_state = wh->wh_wdog_armed;
new_state == wh->wh_wdog_armed && i < 5000; i++) {
bus_space_write_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE, 0x22);
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == 0xea) {
bus_space_write_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE, 0x2f);
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == 0xae) {
bus_space_write_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE, 0x37);
delay(1500);
new_state = bus_space_read_1(wh->wh_st,
wh->wh_sh, WEASEL_WDT_SEMAPHORE);
}
}
}
/* Canonicalize. */
if (new_state)
new_state = 1;
if (new_state == wh->wh_wdog_armed)
error = EIO;
else
wh->wh_wdog_armed = new_state;
splx(s);
return (error);
}