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