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/* $OpenBSD: wdt.c,v 1.19 2010/04/08 00:23:54 tedu Exp $ */
/*-
* Copyright (c) 1998,1999 Alex Nash
* 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.
*
* 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.
*
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
struct wdt_softc {
/* wdt_dev must be the first item in the struct */
struct device sc_dev;
/* feature set: 0 = none 1 = temp, buzzer, etc. */
int sc_features;
/* device access through bus space */
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
int wdt_probe(struct device *, void *, void *);
void wdt_attach(struct device *, struct device *, void *);
int wdt_is501(struct wdt_softc *);
void wdt_8254_count(struct wdt_softc *, int, u_int16_t);
void wdt_8254_mode(struct wdt_softc *, int, int);
int wdt_set_timeout(void *, int);
void wdt_init_timer(struct wdt_softc *);
void wdt_buzzer_off(struct wdt_softc *);
void wdt_timer_disable(struct wdt_softc *);
void wdt_buzzer_enable(struct wdt_softc *);
struct cfattach wdt_ca = {
sizeof(struct wdt_softc), wdt_probe, wdt_attach
};
struct cfdriver wdt_cd = {
NULL, "wdt", DV_DULL
};
const struct pci_matchid wdt_devices[] = {
{ PCI_VENDOR_INDCOMPSRC, PCI_PRODUCT_INDCOMPSRC_WDT50x }
};
/*
* 8254 counter mappings
*/
#define WDT_8254_TC_LO 0 /* low 16 bits of timeout counter */
#define WDT_8254_TC_HI 1 /* high 16 bits of timeout counter */
#define WDT_8254_BUZZER 2
/*
* WDT500/501 ports
*/
#define WDT_8254_BASE 0
#define WDT_8254_CTL (WDT_8254_BASE + 3)
#define WDT_DISABLE_TIMER 7
#define WDT_ENABLE_TIMER 7
/*
* WDT501 specific ports
*/
#define WDT_STATUS_REG 4
#define WDT_START_BUZZER 4
#define WDT_TEMPERATURE 5
#define WDT_STOP_BUZZER 5
int
wdt_probe(struct device *parent, void *match, void *aux)
{
return (pci_matchbyid((struct pci_attach_args *)aux, wdt_devices,
sizeof(wdt_devices)/sizeof(wdt_devices[0])));
}
void
wdt_attach(struct device *parent, struct device *self, void *aux)
{
struct wdt_softc *wdt = (struct wdt_softc *)self;
struct pci_attach_args *const pa = (struct pci_attach_args *)aux;
bus_size_t iosize;
/* retrieve the I/O region (BAR2) */
if (pci_mapreg_map(pa, 0x18, PCI_MAPREG_TYPE_IO, 0,
&wdt->sc_iot, &wdt->sc_ioh, NULL, &iosize, 0) != 0) {
printf("%s: couldn't find PCI I/O region\n",
wdt->sc_dev.dv_xname);
return;
}
/* sanity check I/O size */
if (iosize != (bus_size_t)16) {
printf("%s: invalid I/O region size\n",
wdt->sc_dev.dv_xname);
return;
}
/* initialize the watchdog timer structure */
/* check the feature set available */
if (wdt_is501(wdt))
wdt->sc_features = 1;
else
wdt->sc_features = 0;
if (wdt->sc_features) {
/*
* turn off the buzzer, it may have been activated
* by a previous timeout
*/
wdt_buzzer_off(wdt);
wdt_buzzer_enable(wdt);
}
/* initialize the timer modes and the lower 16-bit counter */
wdt_init_timer(wdt);
/*
* ensure that the watchdog is disabled
*/
wdt_timer_disable(wdt);
/*
* register with the watchdog framework
*/
wdog_register(wdt, wdt_set_timeout);
}
/*
* wdt_is501
*
* Returns non-zero if the card is a 501 model.
*/
int
wdt_is501(struct wdt_softc *wdt)
{
/*
* It makes too much sense to detect the card type
* by the device ID, so we have to resort to testing
* the presence of a register to determine the type.
*/
int v = bus_space_read_1(wdt->sc_iot, wdt->sc_ioh, WDT_TEMPERATURE);
/* XXX may not be reliable */
if (v == 0 || v == 0xFF)
return(0);
return(1);
}
/*
* wdt_8254_count
*
* Loads the specified counter with the 16-bit value 'v'.
*/
void
wdt_8254_count(struct wdt_softc *wdt, int counter, u_int16_t v)
{
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh,
WDT_8254_BASE + counter, v & 0xFF);
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh, WDT_8254_BASE + counter, v >> 8);
}
/*
* wdt_8254_mode
*
* Sets the mode of the specified counter.
*/
void
wdt_8254_mode(struct wdt_softc *wdt, int counter, int mode)
{
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh, WDT_8254_CTL,
(counter << 6) | 0x30 | (mode << 1));
}
/*
* wdt_set_timeout
*
* Load the watchdog timer with the specified number of seconds.
* Clamp seconds to be in the interval [2; 1800].
*/
int
wdt_set_timeout(void *self, int seconds)
{
struct wdt_softc *wdt = (struct wdt_softc *)self;
u_int16_t v;
int s;
s = splclock();
wdt_timer_disable(wdt);
if (seconds == 0) {
splx(s);
return (0);
} else if (seconds < 2)
seconds = 2;
else if (seconds > 1800)
seconds = 1800;
/* 8254 has been programmed with a 2ms period */
v = (u_int16_t)seconds * 50;
/* load the new timeout count */
wdt_8254_count(wdt, WDT_8254_TC_HI, v);
/* enable the timer */
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh, WDT_ENABLE_TIMER, 0);
splx(s);
return (seconds);
}
/*
* wdt_timer_disable
*
* Disables the watchdog timer and cancels the scheduled (if any)
* kernel timeout.
*/
void
wdt_timer_disable(struct wdt_softc *wdt)
{
(void)bus_space_read_1(wdt->sc_iot, wdt->sc_ioh, WDT_DISABLE_TIMER);
}
/*
* wdt_init_timer
*
* Configure the modes for the watchdog counters and initialize
* the low 16-bits of the watchdog counter to have a period of
* approximately 1/50th of a second.
*/
void
wdt_init_timer(struct wdt_softc *wdt)
{
wdt_8254_mode(wdt, WDT_8254_TC_LO, 3);
wdt_8254_mode(wdt, WDT_8254_TC_HI, 2);
wdt_8254_count(wdt, WDT_8254_TC_LO, 41666);
}
/*******************************************************************
* WDT501 specific functions
*******************************************************************/
/*
* wdt_buzzer_off
*
* Turns the buzzer off.
*/
void
wdt_buzzer_off(struct wdt_softc *wdt)
{
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh, WDT_STOP_BUZZER, 0);
}
#ifndef WDT_DISABLE_BUZZER
/*
* wdt_buzzer_enable
*
* Enables the buzzer when the watchdog counter expires.
*/
void
wdt_buzzer_enable(struct wdt_softc *wdt)
{
bus_space_write_1(wdt->sc_iot, wdt->sc_ioh, WDT_8254_BUZZER, 1);
wdt_8254_mode(wdt, WDT_8254_BUZZER, 1);
}
#else
/*
* wdt_buzzer_disable
*
* Disables the buzzer from sounding when the watchdog counter
* expires.
*/
void
wdt_buzzer_disable(struct wdt_softc *wdt)
{
wdt_8254_mode(wdt, WDT_8254_BUZZER, 0);
}
#endif
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