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viawd.c
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viawd.h
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Editing: viawd.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org> * All rights reserved. * * 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. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/eventhandler.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 "viawd.h" #define viawd_read_4(sc, off) bus_read_4((sc)->wd_res, (off)) #define viawd_write_4(sc, off, val) \ bus_write_4((sc)->wd_res, (off), (val)) static struct viawd_device viawd_devices[] = { { DEVICEID_VT8251, "VIA VT8251 watchdog timer" }, { DEVICEID_CX700, "VIA CX700 watchdog timer" }, { DEVICEID_VX800, "VIA VX800 watchdog timer" }, { DEVICEID_VX855, "VIA VX855 watchdog timer" }, { DEVICEID_VX900, "VIA VX900 watchdog timer" }, { 0, NULL }, }; static devclass_t viawd_devclass; static void viawd_tmr_state(struct viawd_softc *sc, int enable) { uint32_t reg; reg = viawd_read_4(sc, VIAWD_MEM_CTRL); if (enable) reg |= VIAWD_MEM_CTRL_TRIGGER | VIAWD_MEM_CTRL_ENABLE; else reg &= ~VIAWD_MEM_CTRL_ENABLE; viawd_write_4(sc, VIAWD_MEM_CTRL, reg); } static void viawd_tmr_set(struct viawd_softc *sc, unsigned int timeout) { /* Keep value in range. */ if (timeout < VIAWD_MEM_COUNT_MIN) timeout = VIAWD_MEM_COUNT_MIN; else if (timeout > VIAWD_MEM_COUNT_MAX) timeout = VIAWD_MEM_COUNT_MAX; viawd_write_4(sc, VIAWD_MEM_COUNT, timeout); sc->timeout = timeout; } /* * Watchdog event handler - called by the framework to enable or disable * the watchdog or change the initial timeout value. */ static void viawd_event(void *arg, unsigned int cmd, int *error) { struct viawd_softc *sc = arg; unsigned int timeout; /* Convert from power-of-two-ns to second. */ cmd &= WD_INTERVAL; timeout = ((uint64_t)1 << cmd) / 1000000000; if (cmd) { if (timeout != sc->timeout) viawd_tmr_set(sc, timeout); viawd_tmr_state(sc, 1); *error = 0; } else viawd_tmr_state(sc, 0); } /* Look for a supported VIA south bridge. */ static struct viawd_device * viawd_find(device_t dev) { struct viawd_device *id; if (pci_get_vendor(dev) != VENDORID_VIA) return (NULL); for (id = viawd_devices; id->desc != NULL; id++) if (pci_get_device(dev) == id->device) return (id); return (NULL); } static void viawd_identify(driver_t *driver, device_t parent) { if (viawd_find(parent) == NULL) return; if (device_find_child(parent, driver->name, -1) == NULL) BUS_ADD_CHILD(parent, 0, driver->name, 0); } static int viawd_probe(device_t dev) { struct viawd_device *id; id = viawd_find(device_get_parent(dev)); KASSERT(id != NULL, ("parent should be a valid VIA SB")); device_set_desc(dev, id->desc); return (BUS_PROBE_GENERIC); } static int viawd_attach(device_t dev) { device_t sb_dev; struct viawd_softc *sc; uint32_t pmbase, reg; sc = device_get_softc(dev); sc->dev = dev; sb_dev = device_get_parent(dev); if (sb_dev == NULL) { device_printf(dev, "Can not find watchdog device.\n"); goto fail; } sc->sb_dev = sb_dev; /* Get watchdog memory base. */ pmbase = pci_read_config(sb_dev, VIAWD_CONFIG_BASE, 4); if (pmbase == 0) { device_printf(dev, "Watchdog disabled in BIOS or hardware\n"); goto fail; } /* Allocate I/O register space. */ sc->wd_rid = VIAWD_CONFIG_BASE; sc->wd_res = bus_alloc_resource_any(sb_dev, SYS_RES_MEMORY, &sc->wd_rid, RF_ACTIVE | RF_SHAREABLE); if (sc->wd_res == NULL) { device_printf(dev, "Unable to map watchdog memory\n"); goto fail; } if (rman_get_size(sc->wd_res) < VIAWD_MEM_LEN) { device_printf(dev, "Bad size for watchdog memory: %#x\n", (unsigned)rman_get_size(sc->wd_res)); goto fail; } /* Check if watchdog fired last boot. */ reg = viawd_read_4(sc, VIAWD_MEM_CTRL); if (reg & VIAWD_MEM_CTRL_FIRED) { device_printf(dev, "ERROR: watchdog rebooted the system\n"); /* Reset bit state. */ viawd_write_4(sc, VIAWD_MEM_CTRL, reg); } /* Register the watchdog event handler. */ sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, viawd_event, sc, 0); return (0); fail: if (sc->wd_res != NULL) bus_release_resource(sb_dev, SYS_RES_MEMORY, sc->wd_rid, sc->wd_res); return (ENXIO); } static int viawd_detach(device_t dev) { struct viawd_softc *sc; uint32_t reg; sc = device_get_softc(dev); /* Deregister event handler. */ if (sc->ev_tag != NULL) EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag); sc->ev_tag = NULL; /* * Do not stop the watchdog on shutdown if active but bump the * timer to avoid spurious reset. */ reg = viawd_read_4(sc, VIAWD_MEM_CTRL); if (reg & VIAWD_MEM_CTRL_ENABLE) { viawd_tmr_set(sc, VIAWD_TIMEOUT_SHUTDOWN); viawd_tmr_state(sc, 1); device_printf(dev, "Keeping watchog alive during shutdown for %d seconds\n", VIAWD_TIMEOUT_SHUTDOWN); } if (sc->wd_res != NULL) bus_release_resource(sc->sb_dev, SYS_RES_MEMORY, sc->wd_rid, sc->wd_res); return (0); } static device_method_t viawd_methods[] = { DEVMETHOD(device_identify, viawd_identify), DEVMETHOD(device_probe, viawd_probe), DEVMETHOD(device_attach, viawd_attach), DEVMETHOD(device_detach, viawd_detach), DEVMETHOD(device_shutdown, viawd_detach), {0,0} }; static driver_t viawd_driver = { "viawd", viawd_methods, sizeof(struct viawd_softc), }; DRIVER_MODULE(viawd, isab, viawd_driver, viawd_devclass, NULL, NULL);
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