237 lines
6.3 KiB
C
237 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Andriy Gapon
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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/bus.h>
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#include <sys/eventhandler.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <sys/watchdog.h>
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#include <dev/superio/superio.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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struct itwd_softc {
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eventhandler_tag wd_ev;
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void *intr_handle;
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struct resource *intr_res;
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int intr_rid;
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};
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static void
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wd_func(void *priv, u_int cmd, int *error)
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{
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device_t dev = priv;
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uint64_t timeout;
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uint8_t val;
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if (cmd != 0) {
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cmd &= WD_INTERVAL;
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/*
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* Convert the requested timeout to seconds.
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* If the timeout is smaller than the minimal supported value
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* then set it to the minimum.
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* TODO This hardware actually supports 64ms resolution
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* when bit 5 of 0x72 is set. Switch to that resolution when
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* needed.
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*/
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if (cmd >= WD_TO_1SEC)
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timeout = (uint64_t)1 << (cmd - WD_TO_1SEC);
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else
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timeout = 1;
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/* TODO If timeout is greater than maximum value
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* that can be specified in seconds, we should
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* switch the timer to minutes mode by clearing
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* bit 7 of 0x72 (ensure that bit 5 is also cleared).
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*
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* For now, just disable the timer to honor the
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* watchdog(9) protocol.
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*
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* XXX The timeout actually can be up to 65535 units
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* as it is set via two registers 0x73, LSB, and 0x74,
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* MSB. But it is not clear what the protocol for writing
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* those two registers is.
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*/
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if (timeout <= UINT8_MAX) {
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val = timeout;
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*error = 0;
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} else {
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/* error left unchanged */
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val = 0;
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}
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} else {
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val = 0;
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}
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#ifdef DIAGNOSTIC
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if (bootverbose)
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device_printf(dev, "setting timeout to %d\n", val);
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#endif
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superio_write(dev, 0x73, val);
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if (superio_read(dev, 0x73) != val)
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superio_write(dev, 0x73, val);
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}
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static void
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itwd_intr(void *cookie)
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{
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device_t dev = cookie;
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uint8_t val;
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val = superio_read(dev, 0x71);
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if (bootverbose)
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device_printf(dev, "got interrupt, wdt status = %d\n", val & 1);
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superio_write(dev, 0x71, val & ~((uint8_t)0x01));
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}
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static int
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itwd_probe(device_t dev)
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{
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if (superio_vendor(dev) != SUPERIO_VENDOR_ITE)
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return (ENXIO);
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if (superio_get_type(dev) != SUPERIO_DEV_WDT)
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return (ENXIO);
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device_set_desc(dev, "Watchdog Timer on ITE SuperIO");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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itwd_attach(device_t dev)
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{
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struct itwd_softc *sc = device_get_softc(dev);
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int irq = 0;
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int nmi = 0;
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int error;
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/* First, reset the timeout, just in case. */
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superio_write(dev, 0x74, 0);
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superio_write(dev, 0x73, 0);
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TUNABLE_INT_FETCH("dev.itwd.irq", &irq);
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TUNABLE_INT_FETCH("dev.itwd.nmi", &nmi);
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if (irq < 0 || irq > 15) {
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device_printf(dev, "Ignoring invalid IRQ value %d\n", irq);
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irq = 0;
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}
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if (irq == 0 && nmi) {
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device_printf(dev, "Ignoring NMI mode if IRQ is not set\n");
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nmi = 0;
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}
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/*
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* NB: if the interrupt has been configured for the NMI delivery,
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* then it is not available for the regular interrupt allocation.
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* Thus, we configure the hardware to generate the interrupt,
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* but do not attempt to allocate and setup it as a regular
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* interrupt.
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*/
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if (irq != 0 && !nmi) {
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sc->intr_rid = 0;
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bus_set_resource(dev, SYS_RES_IRQ, sc->intr_rid, irq, 1);
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sc->intr_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
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&sc->intr_rid, RF_ACTIVE);
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if (sc->intr_res == NULL) {
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device_printf(dev, "unable to map interrupt\n");
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return (ENXIO);
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}
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error = bus_setup_intr(dev, sc->intr_res,
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INTR_TYPE_MISC | INTR_MPSAFE, NULL, itwd_intr, dev,
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&sc->intr_handle);
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if (error != 0) {
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bus_release_resource(dev, SYS_RES_IRQ,
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sc->intr_rid, sc->intr_res);
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device_printf(dev, "Unable to setup irq: error %d\n",
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error);
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return (ENXIO);
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}
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}
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if (irq != 0) {
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device_printf(dev, "Using IRQ%d to signal timeout\n", irq);
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} else {
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/* System reset via KBRST. */
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irq = 0x40;
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device_printf(dev, "Configured for system reset on timeout\n");
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}
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superio_write(dev, 0x71, 0);
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superio_write(dev, 0x72, 0x80 | (uint8_t)irq);
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sc->wd_ev = EVENTHANDLER_REGISTER(watchdog_list, wd_func, dev, 0);
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return (0);
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}
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static int
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itwd_detach(device_t dev)
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{
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struct itwd_softc *sc = device_get_softc(dev);
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int dummy;
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if (sc->wd_ev != NULL)
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EVENTHANDLER_DEREGISTER(watchdog_list, sc->wd_ev);
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wd_func(dev, 0, &dummy);
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if (sc->intr_handle)
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bus_teardown_intr(dev, sc->intr_res, sc->intr_handle);
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if (sc->intr_res)
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bus_release_resource(dev, SYS_RES_IRQ, sc->intr_rid,
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sc->intr_res);
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return (0);
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}
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static device_method_t itwd_methods[] = {
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/* Methods from the device interface */
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DEVMETHOD(device_probe, itwd_probe),
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DEVMETHOD(device_attach, itwd_attach),
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DEVMETHOD(device_detach, itwd_detach),
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/* Terminate method list */
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{ 0, 0 }
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};
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static driver_t itwd_driver = {
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"itwd",
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itwd_methods,
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sizeof (struct itwd_softc)
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};
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static devclass_t itwd_devclass;
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DRIVER_MODULE(itwd, superio, itwd_driver, itwd_devclass, NULL, NULL);
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MODULE_DEPEND(itwd, superio, 1, 1, 1);
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MODULE_VERSION(itwd, 1);
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