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/* $OpenBSD: ichwdt.c,v 1.1 2005/05/02 17:26:00 grange Exp $ */
/*
* Copyright (c) 2004 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>
#define ICHWDT_DEBUG
#ifdef ICHWDT_DEBUG
#define DPRINTF(fmt, args...) printf(fmt, ##args)
#else
#define DPRINTF(fmt, args...)
#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_enabled;
int sc_divisor;
};
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(": failed to map memory space\n");
return;
}
reg = pci_conf_read(sc->sc_pc, sc->sc_tag, ICH_WDT_CONF);
DPRINTF(": conf 0x%x", reg);
/* Disable interrupts for now */
reg &= ~ICH_WDT_CONF_INT_MASK;
reg |= ICH_WDT_CONF_INT_DIS;
sc->sc_divisor = (reg & ICH_WDT_CONF_PRE ? 2 ^ 5 : 2 ^ 15);
reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, ICH_WDT_RELOAD);
if (reg & ICH_WDT_RELOAD_TIMEOUT) {
printf(": reboot on timeout");
ichwdt_unlock_write(sc, ICH_WDT_RELOAD, reg);
}
printf("\n");
/* Register new watchdog */
wdog_register(sc, ichwdt_cb);
}
int
ichwdt_cb(void *arg, int period)
{
struct ichwdt_softc *sc = arg;
pcireg_t reg;
if (period == 0) {
/* Disable watchdog timer */
reg = pci_conf_read(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK);
reg &= ~ICH_WDT_LOCK_ENABLED;
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK, reg);
} else {
/* Reset watchdog timer */
ichwdt_unlock_write(sc, ICH_WDT_PRE1, 1);
ichwdt_unlock_write(sc, ICH_WDT_PRE2, 1);
reg = pci_conf_read(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK);
reg &= ~ICH_WDT_LOCK_FREERUN;
reg |= ICH_WDT_LOCK_ENABLED;
pci_conf_write(sc->sc_pc, sc->sc_tag, ICH_WDT_LOCK, reg);
}
return (period);
}
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