freebsd-skq/sys/dev/viawd/viawd.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

255 lines
6.6 KiB
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/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);