387 lines
10 KiB
C
387 lines
10 KiB
C
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/*
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* Copyright (c) 2004 Texas A&M University
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* All rights reserved.
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*
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* Developer: Wm. Daryl Hawkins
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Intel ICH Watchdog Timer (WDT) driver
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*
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* Originally developed by Wm. Daryl Hawkins of Texas A&M
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* Heavily modified by <des@FreeBSD.org>
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*
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* This is a tricky one. The ICH WDT can't be treated as a regular PCI
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* device as it's actually an integrated function of the ICH LPC interface
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* bridge. Detection is also awkward, because we can only infer the
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* presence of the watchdog timer from the fact that the machine has an
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* ICH chipset, or, on ACPI 2.x systems, by the presence of the 'WDDT'
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* ACPI table (although this driver does not support the ACPI detection
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* method).
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*
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* There is one slight problem on non-ACPI or ACPI 1.x systems: we have no
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* way of knowing if the WDT is permanently disabled (either by the BIOS
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* or in hardware).
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*
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* The WDT is programmed through I/O registers in the ACPI I/O space.
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* Intel swears it's always at offset 0x60, so we use that.
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*
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* For details about the ICH WDT, see Intel Application Note AP-725
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* (document no. 292273-001). The WDT is also described in the individual
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* chipset datasheets, e.g. Intel82801EB ICH5 / 82801ER ICH5R Datasheet
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* (document no. 252516-001) sections 9.10 and 9.11.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <sys/watchdog.h>
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#include <dev/pci/pcivar.h>
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#include <dev/ichwd/ichwd.h>
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static struct ichwd_device ichwd_devices[] = {
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{ VENDORID_INTEL, DEVICEID_82801AA, "Intel 82801AA watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801AB, "Intel 82801AB watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801BA, "Intel 82801BA watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801BAM, "Intel 82801BAM watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801CA, "Intel 82801CA watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801CAM, "Intel 82801CAM watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801DB, "Intel 82801DB watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801DBM, "Intel 82801DBM watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801E, "Intel 82801E watchdog timer" },
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{ VENDORID_INTEL, DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer" },
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{ 0, 0, NULL },
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};
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static devclass_t ichwd_devclass;
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#define ichwd_read_1(sc, off) \
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bus_space_read_1((sc)->smi_bst, (sc)->smi_bsh, (off))
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#define ichwd_read_2(sc, off) \
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bus_space_read_2((sc)->smi_bst, (sc)->smi_bsh, (off))
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#define ichwd_read_4(sc, off) \
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bus_space_read_4((sc)->smi_bst, (sc)->smi_bsh, (off))
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#define ichwd_write_1(sc, off, val) \
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bus_space_write_1((sc)->smi_bst, (sc)->smi_bsh, (off), (val))
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#define ichwd_write_2(sc, off, val) \
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bus_space_write_2((sc)->smi_bst, (sc)->smi_bsh, (off), (val))
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#define ichwd_write_4(sc, off, val) \
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bus_space_write_4((sc)->smi_bst, (sc)->smi_bsh, (off), (val))
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static __inline void
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ichwd_intr_enable(struct ichwd_softc *sc)
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{
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ichwd_write_4(sc, SMI_EN, ichwd_read_4(sc, SMI_EN) | SMI_TCO_EN);
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}
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static __inline void
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ichwd_intr_disable(struct ichwd_softc *sc)
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{
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ichwd_write_4(sc, SMI_EN, ichwd_read_4(sc, SMI_EN) & ~SMI_TCO_EN);
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}
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static __inline void
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ichwd_sts_reset(struct ichwd_softc *sc)
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{
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ichwd_write_2(sc, TCO1_STS, TCO_TIMEOUT);
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ichwd_write_2(sc, TCO2_STS, TCO_BOOT_STS);
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ichwd_write_2(sc, TCO2_STS, TCO_SECOND_TO_STS);
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}
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static __inline void
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ichwd_tmr_enable(struct ichwd_softc *sc)
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{
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uint16_t cnt;
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cnt = ichwd_read_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
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ichwd_write_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT);
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sc->active = 1;
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if (bootverbose)
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device_printf(sc->device, "timer enabled\n");
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}
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static __inline void
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ichwd_tmr_disable(struct ichwd_softc *sc)
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{
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uint16_t cnt;
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cnt = ichwd_read_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
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ichwd_write_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT);
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sc->active = 0;
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if (bootverbose)
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device_printf(sc->device, "timer disabled\n");
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}
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static __inline void
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ichwd_tmr_reload(struct ichwd_softc *sc)
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{
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ichwd_write_1(sc, TCO_RLD, 1);
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if (bootverbose)
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device_printf(sc->device, "timer reloaded\n");
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}
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static __inline void
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ichwd_tmr_set(struct ichwd_softc *sc, uint8_t timeout)
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{
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ichwd_write_1(sc, TCO_TMR, timeout);
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sc->timeout = timeout;
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if (bootverbose)
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device_printf(sc->device, "timeout set to %u ticks\n", timeout);
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}
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/*
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* Watchdog event handler.
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*/
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static void
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ichwd_event(void *arg, unsigned int cmd, int *error)
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{
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struct ichwd_softc *sc = arg;
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unsigned int timeout;
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cmd &= WD_INTERVAL;
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/* disable / enable */
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if (cmd == 0) {
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if (sc->active)
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ichwd_tmr_disable(sc);
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*error = 0;
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return;
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}
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if (!sc->active)
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ichwd_tmr_enable(sc);
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/* convert from power-of-to-ns to WDT ticks */
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if (cmd >= 64) {
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*error = EINVAL;
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return;
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}
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timeout = ((uint64_t)1 << cmd) / ICHWD_TICK;
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if (timeout < ICHWD_MIN_TIMEOUT || timeout > ICHWD_MAX_TIMEOUT) {
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*error = EINVAL;
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return;
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}
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/* set new initial value */
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if (timeout != sc->timeout)
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ichwd_tmr_set(sc, timeout);
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/* reload */
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ichwd_tmr_reload(sc);
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*error = 0;
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return;
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}
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static int
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ichwd_probe(device_t dev)
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{
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(void)dev;
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return (0);
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}
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static unsigned long pmbase;
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/*
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* Look for an ICH LPC interface bridge. If one is found, register an
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* ichwd device. There can be only one.
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*/
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static void
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ichwd_identify(driver_t *driver, device_t parent)
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{
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struct ichwd_device *id;
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device_t ich = NULL;
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device_t dev;
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printf("%s()\n", __func__);
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/* look for an ICH LPC interface bridge */
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for (id = ichwd_devices; id->desc != NULL; ++id)
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if ((ich = pci_find_device(id->vendor, id->device)) != NULL)
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break;
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if (ich == NULL)
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return;
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if (bootverbose)
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printf("%s(): found ICH chipset: %s\n", __func__, id->desc);
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/* get for ACPI base address */
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pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK;
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if (pmbase == 0) {
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if (bootverbose)
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printf("%s(): ICH PMBASE register is empty\n",
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__func__);
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return;
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}
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/* try to clear the NO_REBOOT bit */
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pci_write_config(ich, ICH_GEN_STA, 0x00, 1);
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if (pci_read_config(ich, ICH_GEN_STA, 1) & ICH_GEN_STA_NO_REBOOT) {
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if (bootverbose)
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printf("%s(): ICH WDT present but disabled\n",
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__func__);
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return;
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}
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/* good, add child to bus */
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if ((dev = device_find_child(parent, driver->name, 0)) == NULL)
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dev = BUS_ADD_CHILD(parent, 0, driver->name, -1);
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device_set_desc_copy(dev, id->desc);
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device_set_driver(dev, driver);
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}
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static int
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ichwd_attach(device_t dev)
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{
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struct ichwd_softc *sc;
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device_printf(dev, "attaching\n");
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sc = device_get_softc(dev);
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sc->device = dev;
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/* allocate I/O register space */
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sc->smi_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->smi_rid,
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pmbase + SMI_BASE, pmbase + SMI_BASE + SMI_LEN - 1, SMI_LEN,
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RF_ACTIVE|RF_SHAREABLE);
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if (sc->smi_res == NULL) {
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device_printf(dev, "unable to reserve SMI registers\n");
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goto fail;
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}
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sc->smi_bst = rman_get_bustag(sc->smi_res);
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sc->smi_bsh = rman_get_bushandle(sc->smi_res);
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sc->tco_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->tco_rid,
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pmbase + TCO_BASE, pmbase + TCO_BASE + TCO_LEN - 1, TCO_LEN,
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RF_ACTIVE|RF_SHAREABLE);
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if (sc->tco_res == NULL) {
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device_printf(dev, "unable to reserve TCO registers\n");
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goto fail;
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}
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sc->tco_bst = rman_get_bustag(sc->tco_res);
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sc->tco_bsh = rman_get_bushandle(sc->tco_res);
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/* reset the watchdog status registers */
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ichwd_sts_reset(sc);
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/* make sure the WDT starts out inactive */
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ichwd_tmr_disable(sc);
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/* register the watchdog event handler */
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sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, ichwd_event, sc, 0);
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/* enable watchdog timeout interrupts */
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ichwd_intr_enable(sc);
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return (0);
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fail:
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sc = device_get_softc(dev);
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if (sc->tco_res != NULL)
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bus_release_resource(dev, SYS_RES_IOPORT,
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sc->tco_rid, sc->tco_res);
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if (sc->smi_res != NULL)
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bus_release_resource(dev, SYS_RES_IOPORT,
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sc->smi_rid, sc->smi_res);
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return (ENXIO);
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}
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static int
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ichwd_detach(device_t dev)
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{
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struct ichwd_softc *sc;
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device_printf(dev, "detaching\n");
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sc = device_get_softc(dev);
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/* halt the watchdog timer */
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if (sc->active)
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ichwd_tmr_disable(sc);
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/* disable watchdog timeout interrupts */
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ichwd_intr_disable(sc);
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/* deregister event handler */
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if (sc->ev_tag != NULL)
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EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
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sc->ev_tag = NULL;
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/* reset the watchdog status registers */
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ichwd_sts_reset(sc);
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/* deallocate I/O register space */
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bus_release_resource(dev, SYS_RES_IOPORT, sc->tco_rid, sc->tco_res);
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bus_release_resource(dev, SYS_RES_IOPORT, sc->smi_rid, sc->smi_res);
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return (0);
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}
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static device_method_t ichwd_methods[] = {
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DEVMETHOD(device_identify, ichwd_identify),
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DEVMETHOD(device_probe, ichwd_probe),
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DEVMETHOD(device_attach, ichwd_attach),
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DEVMETHOD(device_detach, ichwd_detach),
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{0,0}
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};
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static driver_t ichwd_driver = {
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"ichwd",
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ichwd_methods,
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sizeof(struct ichwd_softc),
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};
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static int
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ichwd_modevent(module_t mode, int type, void *data)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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printf("ichwd module loaded\n");
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break;
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case MOD_UNLOAD:
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printf("ichwd module unloaded\n");
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break;
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case MOD_SHUTDOWN:
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printf("ichwd module shutting down\n");
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break;
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}
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return (error);
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}
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DRIVER_MODULE(ichwd, nexus, ichwd_driver, ichwd_devclass, ichwd_modevent, NULL);
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/*
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* this doesn't seem to work, though I can't figure out why.
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* currently not a big issue since watchdog is standard.
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MODULE_DEPEND(ichwd, watchdog, 1, 1, 1);
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*/
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