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/* $OpenBSD: ichwdt.c,v 1.4 2012/10/17 22:32:01 deraadt Exp $ */
/*
* Copyright (c) 2004, 2005 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Intel 6300ESB ICH watchdog timer driver.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/ichreg.h>
#ifdef ICHWDT_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
struct ichwdt_softc {
struct device sc_dev;
pci_chipset_tag_t sc_pc;
pcitag_t sc_tag;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_divisor;
int sc_period;
};
int ichwdt_match(struct device *, void *, void *);
void ichwdt_attach(struct device *, struct device *, void *);
int ichwdt_cb(void *, int);
struct cfattach ichwdt_ca = {
sizeof(struct ichwdt_softc),
ichwdt_match,
ichwdt_attach
};
struct cfdriver ichwdt_cd = {
NULL, "ichwdt", DV_DULL
};
const struct pci_matchid ichwdt_devices[] = {
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_6300ESB_WDT }
};
static __inline void
ichwdt_unlock_write(struct ichwdt_softc *sc, int reg, u_int32_t val)
{
/* Register unlocking sequence */
bus_space_write_4(sc->sc_iot, sc->sc_ioh, ICH_WDT_RELOAD, 0x80);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, ICH_WDT_RELOAD, 0x86);
/* Now it's possible to write to the register */
bus_space_write_4(sc->sc_iot, sc->sc_ioh, reg, val);
}
int
ichwdt_match(struct device *parent, void *match, void *aux)
{
return (pci_matchbyid((struct pci_attach_args *)aux, ichwdt_devices,
sizeof(ichwdt_devices) / sizeof(ichwdt_devices[0])));
}
void
ichwdt_attach(struct device *parent, struct device *self, void *aux)
{
struct ichwdt_softc *sc = (struct ichwdt_softc *)self;
struct pci_attach_args *pa = aux;
u_int32_t reg;
sc->sc_pc = pa->pa_pc;
sc->sc_tag = pa->pa_tag;
/* Map memory space */
sc->sc_iot = pa->pa_iot;
if (pci_mapreg_map(pa, ICH_WDT_BASE, PCI_MAPREG_TYPE_MEM, 0,
&sc->sc_iot, &sc->sc_ioh, NULL, NULL, 0)) {
printf(": can't map mem space\n");
return;
}
/* Read current configuration */
reg = pci_conf_read(sc->sc_pc, sc->sc_tag, ICH_WDT_CONF);
DPRINTF((": conf 0x%x", reg));
/* Get clock divisor */
sc->sc_divisor = (reg & ICH_WDT_CONF_PRE ? 32 : 32768);
printf(": %s clock", (reg & ICH_WDT_CONF_PRE ? "1MHz" : "1kHz"));
/* Disable interrupts since we don't use first stage timeout alarm */
reg &= ~ICH_WDT_CONF_INT_MASK;
reg |= ICH_WDT_CONF_INT_DIS;
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_CONF, reg);
/* Check for reboot on timeout */
reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, ICH_WDT_RELOAD);
if (reg & ICH_WDT_RELOAD_TIMEOUT) {
printf(": reboot on timeout");
/* Clear timeout bit */
ichwdt_unlock_write(sc, ICH_WDT_RELOAD,
ICH_WDT_RELOAD_TIMEOUT);
}
/* Disable watchdog */
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK, 0);
sc->sc_period = 0;
printf("\n");
/* Register new watchdog */
wdog_register(ichwdt_cb, sc);
}
int
ichwdt_cb(void *arg, int period)
{
struct ichwdt_softc *sc = arg;
int ticks;
if (period == 0) {
if (sc->sc_period != 0) {
/* Disable watchdog */
ichwdt_unlock_write(sc, ICH_WDT_RELOAD,
ICH_WDT_RELOAD_RLD);
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK, 0);
DPRINTF(("%s: disabled, conf 0x%x\n",
sc->sc_dev.dv_xname,
pci_conf_read(sc->sc_pc, sc->sc_tag,
ICH_WDT_LOCK)));
}
} else {
/* 1000s should be enough for everyone */
if (period > 1000)
period = 1000;
if (sc->sc_period != period) {
/* Set new timeout */
ticks = (period * 33000000) / sc->sc_divisor;
ichwdt_unlock_write(sc, ICH_WDT_PRE1, ticks);
ichwdt_unlock_write(sc, ICH_WDT_PRE2, 2);
DPRINTF(("%s: timeout %ds (%d ticks)\n",
sc->sc_dev.dv_xname, period, ticks));
}
if (sc->sc_period == 0) {
/* Enable watchdog */
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK,
ICH_WDT_LOCK_ENABLED);
DPRINTF(("%s: enabled, conf 0x%x\n",
sc->sc_dev.dv_xname,
pci_conf_read(sc->sc_pc, sc->sc_tag,
ICH_WDT_LOCK)));
} else {
/* Reset timer */
ichwdt_unlock_write(sc, ICH_WDT_RELOAD,
ICH_WDT_RELOAD_RLD);
DPRINTF(("%s: reloaded\n", sc->sc_dev.dv_xname));
}
}
sc->sc_period = period;
return (period);
}
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