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/*-
* Copyright (c) 2004 Texas A&M University
* All rights reserved.
*
* Developer: Wm. Daryl Hawkins
*
* 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.
*/
/*
* Intel ICH Watchdog Timer (WDT) driver
*
* Originally developed by Wm. Daryl Hawkins of Texas A&M
* Heavily modified by <des@FreeBSD.org>
*
* This is a tricky one. The ICH WDT can't be treated as a regular PCI
* device as it's actually an integrated function of the ICH LPC interface
* bridge. Detection is also awkward, because we can only infer the
* presence of the watchdog timer from the fact that the machine has an
* ICH chipset, or, on ACPI 2.x systems, by the presence of the 'WDDT'
* ACPI table (although this driver does not support the ACPI detection
* method).
*
* There is one slight problem on non-ACPI or ACPI 1.x systems: we have no
* way of knowing if the WDT is permanently disabled (either by the BIOS
* or in hardware).
*
* The WDT is programmed through I/O registers in the ACPI I/O space.
* Intel swears it's always at offset 0x60, so we use that.
*
* For details about the ICH WDT, see Intel Application Note AP-725
* (document no. 292273-001). The WDT is also described in the individual
* chipset datasheets, e.g. Intel82801EB ICH5 / 82801ER ICH5R Datasheet
* (document no. 252516-001) sections 9.10 and 9.11.
*
* ICH6/7/8 support by Takeharu KATO <takeharu1219@ybb.ne.jp>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/ichwd/ichwd.c 231153 2012-02-07 19:40:52Z jhb $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <sys/watchdog.h>
#include <isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/ichwd/ichwd.h>
static struct ichwd_device ichwd_devices[] = {
{ DEVICEID_82801AA, "Intel 82801AA watchdog timer", 1 },
{ DEVICEID_82801AB, "Intel 82801AB watchdog timer", 1 },
{ DEVICEID_82801BA, "Intel 82801BA watchdog timer", 2 },
{ DEVICEID_82801BAM, "Intel 82801BAM watchdog timer", 2 },
{ DEVICEID_82801CA, "Intel 82801CA watchdog timer", 3 },
{ DEVICEID_82801CAM, "Intel 82801CAM watchdog timer", 3 },
{ DEVICEID_82801DB, "Intel 82801DB watchdog timer", 4 },
{ DEVICEID_82801DBM, "Intel 82801DBM watchdog timer", 4 },
{ DEVICEID_82801E, "Intel 82801E watchdog timer", 5 },
{ DEVICEID_82801EB, "Intel 82801EB watchdog timer", 5 },
{ DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer", 5 },
{ DEVICEID_6300ESB, "Intel 6300ESB watchdog timer", 5 },
{ DEVICEID_82801FBR, "Intel 82801FB/FR watchdog timer", 6 },
{ DEVICEID_ICH6M, "Intel ICH6M watchdog timer", 6 },
{ DEVICEID_ICH6W, "Intel ICH6W watchdog timer", 6 },
{ DEVICEID_ICH7, "Intel ICH7 watchdog timer", 7 },
{ DEVICEID_ICH7DH, "Intel ICH7DH watchdog timer", 7 },
{ DEVICEID_ICH7M, "Intel ICH7M watchdog timer", 7 },
{ DEVICEID_ICH7MDH, "Intel ICH7MDH watchdog timer", 7 },
{ DEVICEID_NM10, "Intel NM10 watchdog timer", 7 },
{ DEVICEID_ICH8, "Intel ICH8 watchdog timer", 8 },
{ DEVICEID_ICH8DH, "Intel ICH8DH watchdog timer", 8 },
{ DEVICEID_ICH8DO, "Intel ICH8DO watchdog timer", 8 },
{ DEVICEID_ICH8M, "Intel ICH8M watchdog timer", 8 },
{ DEVICEID_ICH8ME, "Intel ICH8M-E watchdog timer", 8 },
{ DEVICEID_63XXESB, "Intel 63XXESB watchdog timer", 8 },
{ DEVICEID_ICH9, "Intel ICH9 watchdog timer", 9 },
{ DEVICEID_ICH9DH, "Intel ICH9DH watchdog timer", 9 },
{ DEVICEID_ICH9DO, "Intel ICH9DO watchdog timer", 9 },
{ DEVICEID_ICH9M, "Intel ICH9M watchdog timer", 9 },
{ DEVICEID_ICH9ME, "Intel ICH9M-E watchdog timer", 9 },
{ DEVICEID_ICH9R, "Intel ICH9R watchdog timer", 9 },
{ DEVICEID_ICH10, "Intel ICH10 watchdog timer", 10 },
{ DEVICEID_ICH10D, "Intel ICH10D watchdog timer", 10 },
{ DEVICEID_ICH10DO, "Intel ICH10DO watchdog timer", 10 },
{ DEVICEID_ICH10R, "Intel ICH10R watchdog timer", 10 },
{ DEVICEID_PCH, "Intel PCH watchdog timer", 10 },
{ DEVICEID_PCHM, "Intel PCH watchdog timer", 10 },
{ DEVICEID_P55, "Intel P55 watchdog timer", 10 },
{ DEVICEID_PM55, "Intel PM55 watchdog timer", 10 },
{ DEVICEID_H55, "Intel H55 watchdog timer", 10 },
{ DEVICEID_QM57, "Intel QM57 watchdog timer", 10 },
{ DEVICEID_H57, "Intel H57 watchdog timer", 10 },
{ DEVICEID_HM55, "Intel HM55 watchdog timer", 10 },
{ DEVICEID_Q57, "Intel Q57 watchdog timer", 10 },
{ DEVICEID_HM57, "Intel HM57 watchdog timer", 10 },
{ DEVICEID_PCHMSFF, "Intel PCHMSFF watchdog timer", 10 },
{ DEVICEID_QS57, "Intel QS57 watchdog timer", 10 },
{ DEVICEID_3400, "Intel 3400 watchdog timer", 10 },
{ DEVICEID_3420, "Intel 3420 watchdog timer", 10 },
{ DEVICEID_3450, "Intel 3450 watchdog timer", 10 },
{ DEVICEID_CPT0, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT1, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT2, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT3, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT4, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT5, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT6, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT7, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT8, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT9, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT10, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT11, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT12, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT13, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT14, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT15, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT16, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT17, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT18, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT19, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT20, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT21, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT22, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT25, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT26, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT27, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT28, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT29, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT30, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_CPT31, "Intel Cougar Point watchdog timer", 10 },
{ DEVICEID_PATSBURG_LPC1, "Intel Patsburg watchdog timer", 10 },
{ DEVICEID_PATSBURG_LPC2, "Intel Patsburg watchdog timer", 10 },
{ DEVICEID_PPT0, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT1, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT2, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT3, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT4, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT5, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT6, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT7, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT8, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT9, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT10, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT11, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT12, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT13, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT14, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT15, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT16, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT17, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT18, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT19, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT20, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT21, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT22, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT23, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT24, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT25, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT26, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT27, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT28, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT29, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT30, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_PPT31, "Intel Panther Point watchdog timer", 10 },
{ DEVICEID_DH89XXCC_LPC, "Intel DH89xxCC watchdog timer", 10 },
{ 0, NULL, 0 },
};
static devclass_t ichwd_devclass;
#define ichwd_read_tco_1(sc, off) \
bus_read_1((sc)->tco_res, (off))
#define ichwd_read_tco_2(sc, off) \
bus_read_2((sc)->tco_res, (off))
#define ichwd_read_tco_4(sc, off) \
bus_read_4((sc)->tco_res, (off))
#define ichwd_read_smi_4(sc, off) \
bus_read_4((sc)->smi_res, (off))
#define ichwd_read_gcs_4(sc, off) \
bus_read_4((sc)->gcs_res, (off))
#define ichwd_write_tco_1(sc, off, val) \
bus_write_1((sc)->tco_res, (off), (val))
#define ichwd_write_tco_2(sc, off, val) \
bus_write_2((sc)->tco_res, (off), (val))
#define ichwd_write_tco_4(sc, off, val) \
bus_write_4((sc)->tco_res, (off), (val))
#define ichwd_write_smi_4(sc, off, val) \
bus_write_4((sc)->smi_res, (off), (val))
#define ichwd_write_gcs_4(sc, off, val) \
bus_write_4((sc)->gcs_res, (off), (val))
#define ichwd_verbose_printf(dev, ...) \
do { \
if (bootverbose) \
device_printf(dev, __VA_ARGS__);\
} while (0)
/*
* Disable the watchdog timeout SMI handler.
*
* Apparently, some BIOSes install handlers that reset or disable the
* watchdog timer instead of resetting the system, so we disable the SMI
* (by clearing the SMI_TCO_EN bit of the SMI_EN register) to prevent this
* from happening.
*/
static __inline void
ichwd_smi_disable(struct ichwd_softc *sc)
{
ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) & ~SMI_TCO_EN);
}
/*
* Enable the watchdog timeout SMI handler. See above for details.
*/
static __inline void
ichwd_smi_enable(struct ichwd_softc *sc)
{
ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) | SMI_TCO_EN);
}
/*
* Check if the watchdog SMI triggering is enabled.
*/
static __inline int
ichwd_smi_is_enabled(struct ichwd_softc *sc)
{
return ((ichwd_read_smi_4(sc, SMI_EN) & SMI_TCO_EN) != 0);
}
/*
* Reset the watchdog status bits.
*/
static __inline void
ichwd_sts_reset(struct ichwd_softc *sc)
{
/*
* The watchdog status bits are set to 1 by the hardware to
* indicate various conditions. They can be cleared by software
* by writing a 1, not a 0.
*/
ichwd_write_tco_2(sc, TCO1_STS, TCO_TIMEOUT);
/*
* According to Intel's docs, clearing SECOND_TO_STS and BOOT_STS must
* be done in two separate operations.
*/
ichwd_write_tco_2(sc, TCO2_STS, TCO_SECOND_TO_STS);
ichwd_write_tco_2(sc, TCO2_STS, TCO_BOOT_STS);
}
/*
* Enable the watchdog timer by clearing the TCO_TMR_HALT bit in the
* TCO1_CNT register. This is complicated by the need to preserve bit 9
* of that same register, and the requirement that all other bits must be
* written back as zero.
*/
static __inline void
ichwd_tmr_enable(struct ichwd_softc *sc)
{
uint16_t cnt;
cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
ichwd_write_tco_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT);
sc->active = 1;
ichwd_verbose_printf(sc->device, "timer enabled\n");
}
/*
* Disable the watchdog timer. See above for details.
*/
static __inline void
ichwd_tmr_disable(struct ichwd_softc *sc)
{
uint16_t cnt;
cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
ichwd_write_tco_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT);
sc->active = 0;
ichwd_verbose_printf(sc->device, "timer disabled\n");
}
/*
* Reload the watchdog timer: writing anything to any of the lower five
* bits of the TCO_RLD register reloads the timer from the last value
* written to TCO_TMR.
*/
static __inline void
ichwd_tmr_reload(struct ichwd_softc *sc)
{
if (sc->ich_version <= 5)
ichwd_write_tco_1(sc, TCO_RLD, 1);
else
ichwd_write_tco_2(sc, TCO_RLD, 1);
ichwd_verbose_printf(sc->device, "timer reloaded\n");
}
/*
* Set the initial timeout value. Note that this must always be followed
* by a reload.
*/
static __inline void
ichwd_tmr_set(struct ichwd_softc *sc, unsigned int timeout)
{
if (timeout < TCO_RLD_TMR_MIN)
timeout = TCO_RLD_TMR_MIN;
if (sc->ich_version <= 5) {
uint8_t tmr_val8 = ichwd_read_tco_1(sc, TCO_TMR1);
tmr_val8 &= (~TCO_RLD1_TMR_MAX & 0xff);
if (timeout > TCO_RLD1_TMR_MAX)
timeout = TCO_RLD1_TMR_MAX;
tmr_val8 |= timeout;
ichwd_write_tco_1(sc, TCO_TMR1, tmr_val8);
} else {
uint16_t tmr_val16 = ichwd_read_tco_2(sc, TCO_TMR2);
tmr_val16 &= (~TCO_RLD2_TMR_MAX & 0xffff);
if (timeout > TCO_RLD2_TMR_MAX)
timeout = TCO_RLD2_TMR_MAX;
tmr_val16 |= timeout;
ichwd_write_tco_2(sc, TCO_TMR2, tmr_val16);
}
sc->timeout = timeout;
ichwd_verbose_printf(sc->device, "timeout set to %u ticks\n", timeout);
}
static __inline int
ichwd_clear_noreboot(struct ichwd_softc *sc)
{
uint32_t status;
int rc = 0;
/* try to clear the NO_REBOOT bit */
if (sc->ich_version <= 5) {
status = pci_read_config(sc->ich, ICH_GEN_STA, 1);
status &= ~ICH_GEN_STA_NO_REBOOT;
pci_write_config(sc->ich, ICH_GEN_STA, status, 1);
status = pci_read_config(sc->ich, ICH_GEN_STA, 1);
if (status & ICH_GEN_STA_NO_REBOOT)
rc = EIO;
} else {
status = ichwd_read_gcs_4(sc, 0);
status &= ~ICH_GCS_NO_REBOOT;
ichwd_write_gcs_4(sc, 0, status);
status = ichwd_read_gcs_4(sc, 0);
if (status & ICH_GCS_NO_REBOOT)
rc = EIO;
}
if (rc)
device_printf(sc->device,
"ICH WDT present but disabled in BIOS or hardware\n");
return (rc);
}
/*
* Watchdog event handler - called by the framework to enable or disable
* the watchdog or change the initial timeout value.
*/
static void
ichwd_event(void *arg, unsigned int cmd, int *error)
{
struct ichwd_softc *sc = arg;
unsigned int timeout;
/* convert from power-of-two-ns to WDT ticks */
cmd &= WD_INTERVAL;
timeout = ((uint64_t)1 << cmd) / ICHWD_TICK;
if (cmd) {
if (!sc->active)
ichwd_tmr_enable(sc);
if (timeout != sc->timeout)
ichwd_tmr_set(sc, timeout);
ichwd_tmr_reload(sc);
*error = 0;
} else {
if (sc->active)
ichwd_tmr_disable(sc);
}
}
static device_t
ichwd_find_ich_lpc_bridge(struct ichwd_device **id_p)
{
struct ichwd_device *id;
device_t ich = NULL;
/* look for an ICH LPC interface bridge */
for (id = ichwd_devices; id->desc != NULL; ++id)
if ((ich = pci_find_device(VENDORID_INTEL, id->device)) != NULL)
break;
if (ich == NULL)
return (NULL);
ichwd_verbose_printf(ich, "found ICH%d or equivalent chipset: %s\n",
id->version, id->desc);
if (id_p)
*id_p = id;
return (ich);
}
/*
* Look for an ICH LPC interface bridge. If one is found, register an
* ichwd device. There can be only one.
*/
static void
ichwd_identify(driver_t *driver, device_t parent)
{
struct ichwd_device *id_p;
device_t ich = NULL;
device_t dev;
uint32_t rcba;
int rc;
ich = ichwd_find_ich_lpc_bridge(&id_p);
if (ich == NULL)
return;
/* good, add child to bus */
if ((dev = device_find_child(parent, driver->name, 0)) == NULL)
dev = BUS_ADD_CHILD(parent, 0, driver->name, 0);
if (dev == NULL)
return;
device_set_desc_copy(dev, id_p->desc);
if (id_p->version >= 6) {
/* get RCBA (root complex base address) */
rcba = pci_read_config(ich, ICH_RCBA, 4);
rc = bus_set_resource(ich, SYS_RES_MEMORY, 0,
(rcba & 0xffffc000) + ICH_GCS_OFFSET, ICH_GCS_SIZE);
if (rc)
ichwd_verbose_printf(dev,
"Can not set memory resource for RCBA\n");
}
}
static int
ichwd_probe(device_t dev)
{
/* Do not claim some ISA PnP device by accident. */
if (isa_get_logicalid(dev) != 0)
return (ENXIO);
return (0);
}
static int
ichwd_attach(device_t dev)
{
struct ichwd_softc *sc;
struct ichwd_device *id_p;
device_t ich;
unsigned int pmbase = 0;
sc = device_get_softc(dev);
sc->device = dev;
ich = ichwd_find_ich_lpc_bridge(&id_p);
if (ich == NULL) {
device_printf(sc->device, "Can not find ICH device.\n");
goto fail;
}
sc->ich = ich;
sc->ich_version = id_p->version;
/* get ACPI base address */
pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK;
if (pmbase == 0) {
device_printf(dev, "ICH PMBASE register is empty\n");
goto fail;
}
/* allocate I/O register space */
sc->smi_rid = 0;
sc->smi_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->smi_rid,
pmbase + SMI_BASE, pmbase + SMI_BASE + SMI_LEN - 1, SMI_LEN,
RF_ACTIVE | RF_SHAREABLE);
if (sc->smi_res == NULL) {
device_printf(dev, "unable to reserve SMI registers\n");
goto fail;
}
sc->tco_rid = 1;
sc->tco_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->tco_rid,
pmbase + TCO_BASE, pmbase + TCO_BASE + TCO_LEN - 1, TCO_LEN,
RF_ACTIVE | RF_SHAREABLE);
if (sc->tco_res == NULL) {
device_printf(dev, "unable to reserve TCO registers\n");
goto fail;
}
sc->gcs_rid = 0;
if (sc->ich_version >= 6) {
sc->gcs_res = bus_alloc_resource_any(ich, SYS_RES_MEMORY,
&sc->gcs_rid, RF_ACTIVE|RF_SHAREABLE);
if (sc->gcs_res == NULL) {
device_printf(dev, "unable to reserve GCS registers\n");
goto fail;
}
}
if (ichwd_clear_noreboot(sc) != 0)
goto fail;
ichwd_verbose_printf(dev, "%s (ICH%d or equivalent)\n",
device_get_desc(dev), sc->ich_version);
/*
* Determine if we are coming up after a watchdog-induced reset. Some
* BIOSes may clear this bit at bootup, preventing us from reporting
* this case on such systems. We clear this bit in ichwd_sts_reset().
*/
if ((ichwd_read_tco_2(sc, TCO2_STS) & TCO_SECOND_TO_STS) != 0)
device_printf(dev,
"resuming after hardware watchdog timeout\n");
/* reset the watchdog status registers */
ichwd_sts_reset(sc);
/* make sure the WDT starts out inactive */
ichwd_tmr_disable(sc);
/* register the watchdog event handler */
sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, ichwd_event, sc, 0);
/* disable the SMI handler */
sc->smi_enabled = ichwd_smi_is_enabled(sc);
ichwd_smi_disable(sc);
return (0);
fail:
sc = device_get_softc(dev);
if (sc->tco_res != NULL)
bus_release_resource(dev, SYS_RES_IOPORT,
sc->tco_rid, sc->tco_res);
if (sc->smi_res != NULL)
bus_release_resource(dev, SYS_RES_IOPORT,
sc->smi_rid, sc->smi_res);
if (sc->gcs_res != NULL)
bus_release_resource(ich, SYS_RES_MEMORY,
sc->gcs_rid, sc->gcs_res);
return (ENXIO);
}
static int
ichwd_detach(device_t dev)
{
struct ichwd_softc *sc;
device_t ich = NULL;
sc = device_get_softc(dev);
/* halt the watchdog timer */
if (sc->active)
ichwd_tmr_disable(sc);
/* enable the SMI handler */
if (sc->smi_enabled != 0)
ichwd_smi_enable(sc);
/* deregister event handler */
if (sc->ev_tag != NULL)
EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
sc->ev_tag = NULL;
/* reset the watchdog status registers */
ichwd_sts_reset(sc);
/* deallocate I/O register space */
bus_release_resource(dev, SYS_RES_IOPORT, sc->tco_rid, sc->tco_res);
bus_release_resource(dev, SYS_RES_IOPORT, sc->smi_rid, sc->smi_res);
/* deallocate memory resource */
ich = ichwd_find_ich_lpc_bridge(NULL);
if (sc->gcs_res && ich)
bus_release_resource(ich, SYS_RES_MEMORY, sc->gcs_rid, sc->gcs_res);
return (0);
}
static device_method_t ichwd_methods[] = {
DEVMETHOD(device_identify, ichwd_identify),
DEVMETHOD(device_probe, ichwd_probe),
DEVMETHOD(device_attach, ichwd_attach),
DEVMETHOD(device_detach, ichwd_detach),
DEVMETHOD(device_shutdown, ichwd_detach),
{0,0}
};
static driver_t ichwd_driver = {
"ichwd",
ichwd_methods,
sizeof(struct ichwd_softc),
};
DRIVER_MODULE(ichwd, isa, ichwd_driver, ichwd_devclass, NULL, NULL);