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