277 lines
7.0 KiB
C
277 lines
7.0 KiB
C
/*-
|
|
* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
|
|
* Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com>
|
|
* 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/systm.h>
|
|
#include <sys/watchdog.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/rman.h>
|
|
|
|
#include <dev/fdt/fdt_common.h>
|
|
#include <dev/ofw/openfirm.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/machdep.h>
|
|
|
|
#include <arm/allwinner/aw_wdog.h>
|
|
|
|
#define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
|
|
#define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
|
|
|
|
#define A10_WDOG_CTRL 0x00
|
|
#define A31_WDOG_CTRL 0x10
|
|
#define WDOG_CTRL_RESTART (1 << 0)
|
|
#define A31_WDOG_CTRL_KEY (0xa57 << 1)
|
|
#define A10_WDOG_MODE 0x04
|
|
#define A31_WDOG_MODE 0x18
|
|
#define A10_WDOG_MODE_INTVL_SHIFT 3
|
|
#define A31_WDOG_MODE_INTVL_SHIFT 4
|
|
#define A10_WDOG_MODE_RST_EN (1 << 1)
|
|
#define WDOG_MODE_EN (1 << 0)
|
|
#define A31_WDOG_CONFIG 0x14
|
|
#define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0)
|
|
#define A31_WDOG_CONFIG_RST_EN_INT (2 << 0)
|
|
|
|
struct aw_wdog_interval {
|
|
uint64_t milliseconds;
|
|
unsigned int value;
|
|
};
|
|
|
|
struct aw_wdog_interval wd_intervals[] = {
|
|
{ 500, 0 },
|
|
{ 1000, 1 },
|
|
{ 2000, 2 },
|
|
{ 3000, 3 },
|
|
{ 4000, 4 },
|
|
{ 5000, 5 },
|
|
{ 6000, 6 },
|
|
{ 8000, 7 },
|
|
{ 10000, 8 },
|
|
{ 12000, 9 },
|
|
{ 14000, 10 },
|
|
{ 16000, 11 },
|
|
{ 0, 0 } /* sentinel */
|
|
};
|
|
|
|
static struct aw_wdog_softc *aw_wdog_sc = NULL;
|
|
|
|
struct aw_wdog_softc {
|
|
device_t dev;
|
|
struct resource * res;
|
|
struct mtx mtx;
|
|
uint8_t wdog_ctrl;
|
|
uint32_t wdog_ctrl_key;
|
|
uint8_t wdog_mode;
|
|
uint8_t wdog_mode_intvl_shift;
|
|
uint8_t wdog_mode_en;
|
|
uint8_t wdog_config;
|
|
uint8_t wdog_config_value;
|
|
};
|
|
|
|
#define A10_WATCHDOG 1
|
|
#define A31_WATCHDOG 2
|
|
|
|
static struct ofw_compat_data compat_data[] = {
|
|
{"allwinner,sun4i-a10-wdt", A10_WATCHDOG},
|
|
{"allwinner,sun6i-a31-wdt", A31_WATCHDOG},
|
|
{NULL, 0}
|
|
};
|
|
|
|
static void aw_wdog_watchdog_fn(void *, u_int, int *);
|
|
static void aw_wdog_shutdown_fn(void *, int);
|
|
|
|
static int
|
|
aw_wdog_probe(device_t dev)
|
|
{
|
|
struct aw_wdog_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
|
|
case A10_WATCHDOG:
|
|
device_set_desc(dev, "Allwinner A10 Watchdog");
|
|
return (BUS_PROBE_DEFAULT);
|
|
case A31_WATCHDOG:
|
|
device_set_desc(dev, "Allwinner A31 Watchdog");
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
return (ENXIO);
|
|
}
|
|
|
|
static int
|
|
aw_wdog_attach(device_t dev)
|
|
{
|
|
struct aw_wdog_softc *sc;
|
|
int rid;
|
|
|
|
if (aw_wdog_sc != NULL)
|
|
return (ENXIO);
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->dev = dev;
|
|
|
|
rid = 0;
|
|
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
|
|
if (sc->res == NULL) {
|
|
device_printf(dev, "could not allocate memory resource\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
aw_wdog_sc = sc;
|
|
|
|
switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
|
|
case A10_WATCHDOG:
|
|
sc->wdog_ctrl = A10_WDOG_CTRL;
|
|
sc->wdog_mode = A10_WDOG_MODE;
|
|
sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT;
|
|
sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN;
|
|
break;
|
|
case A31_WATCHDOG:
|
|
sc->wdog_ctrl = A31_WDOG_CTRL;
|
|
sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY;
|
|
sc->wdog_mode = A31_WDOG_MODE;
|
|
sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT;
|
|
sc->wdog_mode_en = WDOG_MODE_EN;
|
|
sc->wdog_config = A31_WDOG_CONFIG;
|
|
sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM;
|
|
break;
|
|
default:
|
|
bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
|
|
return (ENXIO);
|
|
}
|
|
|
|
mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF);
|
|
EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0);
|
|
EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, sc,
|
|
SHUTDOWN_PRI_LAST - 1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
aw_wdog_watchdog_fn(void *private, u_int cmd, int *error)
|
|
{
|
|
struct aw_wdog_softc *sc;
|
|
uint64_t ms;
|
|
int i;
|
|
|
|
sc = private;
|
|
mtx_lock(&sc->mtx);
|
|
|
|
cmd &= WD_INTERVAL;
|
|
|
|
if (cmd > 0) {
|
|
ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
|
|
i = 0;
|
|
while (wd_intervals[i].milliseconds &&
|
|
(ms > wd_intervals[i].milliseconds))
|
|
i++;
|
|
if (wd_intervals[i].milliseconds) {
|
|
WRITE(sc, sc->wdog_mode,
|
|
(wd_intervals[i].value << sc->wdog_mode_intvl_shift) |
|
|
sc->wdog_mode_en);
|
|
WRITE(sc, sc->wdog_ctrl,
|
|
WDOG_CTRL_RESTART | sc->wdog_ctrl_key);
|
|
if (sc->wdog_config)
|
|
WRITE(sc, sc->wdog_config,
|
|
sc->wdog_config_value);
|
|
*error = 0;
|
|
}
|
|
else {
|
|
/*
|
|
* Can't arm
|
|
* disable watchdog as watchdog(9) requires
|
|
*/
|
|
device_printf(sc->dev,
|
|
"Can't arm, timeout is more than 16 sec\n");
|
|
mtx_unlock(&sc->mtx);
|
|
WRITE(sc, sc->wdog_mode, 0);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
WRITE(sc, sc->wdog_mode, 0);
|
|
|
|
mtx_unlock(&sc->mtx);
|
|
}
|
|
|
|
static void
|
|
aw_wdog_shutdown_fn(void *private, int howto)
|
|
{
|
|
if ((howto & (RB_POWEROFF|RB_HALT)) == 0)
|
|
aw_wdog_watchdog_reset();
|
|
}
|
|
|
|
void
|
|
aw_wdog_watchdog_reset()
|
|
{
|
|
|
|
if (aw_wdog_sc == NULL) {
|
|
printf("Reset: watchdog device has not been initialized\n");
|
|
return;
|
|
}
|
|
|
|
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode,
|
|
(wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) |
|
|
aw_wdog_sc->wdog_mode_en);
|
|
if (aw_wdog_sc->wdog_config)
|
|
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config,
|
|
aw_wdog_sc->wdog_config_value);
|
|
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl,
|
|
WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key);
|
|
while(1)
|
|
;
|
|
|
|
}
|
|
|
|
static device_method_t aw_wdog_methods[] = {
|
|
DEVMETHOD(device_probe, aw_wdog_probe),
|
|
DEVMETHOD(device_attach, aw_wdog_attach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t aw_wdog_driver = {
|
|
"aw_wdog",
|
|
aw_wdog_methods,
|
|
sizeof(struct aw_wdog_softc),
|
|
};
|
|
static devclass_t aw_wdog_devclass;
|
|
|
|
DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0);
|