/* * 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 * * 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. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include static struct ichwd_device ichwd_devices[] = { { VENDORID_INTEL, DEVICEID_82801AA, "Intel 82801AA watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801AB, "Intel 82801AB watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801BA, "Intel 82801BA watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801BAM, "Intel 82801BAM watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801CA, "Intel 82801CA watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801CAM, "Intel 82801CAM watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801DB, "Intel 82801DB watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801DBM, "Intel 82801DBM watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801E, "Intel 82801E watchdog timer" }, { VENDORID_INTEL, DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer" }, { 0, 0, NULL }, }; static devclass_t ichwd_devclass; #define ichwd_read_1(sc, off) \ bus_space_read_1((sc)->smi_bst, (sc)->smi_bsh, (off)) #define ichwd_read_2(sc, off) \ bus_space_read_2((sc)->smi_bst, (sc)->smi_bsh, (off)) #define ichwd_read_4(sc, off) \ bus_space_read_4((sc)->smi_bst, (sc)->smi_bsh, (off)) #define ichwd_write_1(sc, off, val) \ bus_space_write_1((sc)->smi_bst, (sc)->smi_bsh, (off), (val)) #define ichwd_write_2(sc, off, val) \ bus_space_write_2((sc)->smi_bst, (sc)->smi_bsh, (off), (val)) #define ichwd_write_4(sc, off, val) \ bus_space_write_4((sc)->smi_bst, (sc)->smi_bsh, (off), (val)) static __inline void ichwd_intr_enable(struct ichwd_softc *sc) { ichwd_write_4(sc, SMI_EN, ichwd_read_4(sc, SMI_EN) | SMI_TCO_EN); } static __inline void ichwd_intr_disable(struct ichwd_softc *sc) { ichwd_write_4(sc, SMI_EN, ichwd_read_4(sc, SMI_EN) & ~SMI_TCO_EN); } static __inline void ichwd_sts_reset(struct ichwd_softc *sc) { ichwd_write_2(sc, TCO1_STS, TCO_TIMEOUT); ichwd_write_2(sc, TCO2_STS, TCO_BOOT_STS); ichwd_write_2(sc, TCO2_STS, TCO_SECOND_TO_STS); } static __inline void ichwd_tmr_enable(struct ichwd_softc *sc) { uint16_t cnt; cnt = ichwd_read_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; ichwd_write_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT); sc->active = 1; if (bootverbose) device_printf(sc->device, "timer enabled\n"); } static __inline void ichwd_tmr_disable(struct ichwd_softc *sc) { uint16_t cnt; cnt = ichwd_read_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; ichwd_write_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT); sc->active = 0; if (bootverbose) device_printf(sc->device, "timer disabled\n"); } static __inline void ichwd_tmr_reload(struct ichwd_softc *sc) { ichwd_write_1(sc, TCO_RLD, 1); if (bootverbose) device_printf(sc->device, "timer reloaded\n"); } static __inline void ichwd_tmr_set(struct ichwd_softc *sc, uint8_t timeout) { ichwd_write_1(sc, TCO_TMR, timeout); sc->timeout = timeout; if (bootverbose) device_printf(sc->device, "timeout set to %u ticks\n", timeout); } /* * Watchdog event handler. */ static void ichwd_event(void *arg, unsigned int cmd, int *error) { struct ichwd_softc *sc = arg; unsigned int timeout; cmd &= WD_INTERVAL; /* disable / enable */ if (cmd == 0) { if (sc->active) ichwd_tmr_disable(sc); *error = 0; return; } if (!sc->active) ichwd_tmr_enable(sc); /* convert from power-of-to-ns to WDT ticks */ if (cmd >= 64) { *error = EINVAL; return; } timeout = ((uint64_t)1 << cmd) / ICHWD_TICK; if (timeout < ICHWD_MIN_TIMEOUT || timeout > ICHWD_MAX_TIMEOUT) { *error = EINVAL; return; } /* set new initial value */ if (timeout != sc->timeout) ichwd_tmr_set(sc, timeout); /* reload */ ichwd_tmr_reload(sc); *error = 0; return; } static unsigned long pmbase; /* * 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; device_t ich = NULL; device_t dev; /* look for an ICH LPC interface bridge */ for (id = ichwd_devices; id->desc != NULL; ++id) if ((ich = pci_find_device(id->vendor, id->device)) != NULL) break; if (ich == NULL) return; if (bootverbose) printf("%s(): found ICH chipset: %s\n", __func__, id->desc); /* get for ACPI base address */ pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK; if (pmbase == 0) { if (bootverbose) printf("%s(): ICH PMBASE register is empty\n", __func__); return; } /* try to clear the NO_REBOOT bit */ pci_write_config(ich, ICH_GEN_STA, 0x00, 1); if (pci_read_config(ich, ICH_GEN_STA, 1) & ICH_GEN_STA_NO_REBOOT) { if (bootverbose) printf("%s(): ICH WDT present but disabled\n", __func__); return; } /* good, add child to bus */ if ((dev = device_find_child(parent, driver->name, 0)) == NULL) dev = BUS_ADD_CHILD(parent, 0, driver->name, -1); device_set_desc_copy(dev, id->desc); } static int ichwd_probe(device_t dev) { (void)dev; return (0); } static int ichwd_attach(device_t dev) { struct ichwd_softc *sc; sc = device_get_softc(dev); sc->device = dev; /* allocate I/O register space */ 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->smi_bst = rman_get_bustag(sc->smi_res); sc->smi_bsh = rman_get_bushandle(sc->smi_res); 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->tco_bst = rman_get_bustag(sc->tco_res); sc->tco_bsh = rman_get_bushandle(sc->tco_res); /* 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); /* enable watchdog timeout interrupts */ ichwd_intr_enable(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); return (ENXIO); } static int ichwd_detach(device_t dev) { struct ichwd_softc *sc; device_printf(dev, "detaching\n"); sc = device_get_softc(dev); /* halt the watchdog timer */ if (sc->active) ichwd_tmr_disable(sc); /* disable watchdog timeout interrupts */ ichwd_intr_disable(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); 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), {0,0} }; static driver_t ichwd_driver = { "ichwd", ichwd_methods, sizeof(struct ichwd_softc), }; static int ichwd_modevent(module_t mode, int type, void *data) { int error = 0; switch (type) { case MOD_LOAD: printf("ichwd module loaded\n"); break; case MOD_UNLOAD: printf("ichwd module unloaded\n"); break; case MOD_SHUTDOWN: printf("ichwd module shutting down\n"); break; } return (error); } DRIVER_MODULE(ichwd, nexus, ichwd_driver, ichwd_devclass, ichwd_modevent, NULL); /* * this doesn't seem to work, though I can't figure out why. * currently not a big issue since watchdog is standard. MODULE_DEPEND(ichwd, watchdog, 1, 1, 1); */