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/*-
* Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@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/systm.h>
#include <sys/watchdog.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/cpufunc.h>
#include <machine/machdep.h>
#include <machine/fdt.h>
#include <arm/rockchip/rk30xx_wdog.h>
#ifndef RK30_WDT_BASE
#define RK30_WDT_BASE 0x2004c000
#define RK30_WDT_PSIZE 0x100
#endif
#define RK30_WDT_READ(_sc, _r) bus_read_4((_sc)->res, (_r))
#define RK30_WDT_WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
#define WDOG_CTRL 0x00
#define WDOG_CTRL_EN (1 << 0)
#define WDOG_CTRL_RSP_MODE (1 << 1)
#define WDOG_CTRL_RST_PULSE (4 << 2)
#define WDOG_CTRL_RST 0xa
#define WDOG_TORR 0x04
#define WDOG_TORR_INTVL_SHIFT 0
#define WDOG_CCVR 0x08
#define WDOG_CRR 0x0c
#define WDOG_CRR_PWD 0x76
#define WDOG_STAT 0x10
#define WDOG_EOI 0x14
static struct rk30_wd_softc *rk30_wd_sc = NULL;
struct rk30_wd_softc {
device_t dev;
struct resource *res;
struct mtx mtx;
int freq;
};
static void rk30_wd_watchdog_fn(void *private, u_int cmd, int *error);
static int
rk30_wd_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-wdt")) {
device_set_desc(dev, "Rockchip RK30XX Watchdog");
return (BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
rk30_wd_attach(device_t dev)
{
struct rk30_wd_softc *sc;
int rid;
phandle_t node;
pcell_t cell;
if (rk30_wd_sc != NULL)
return (ENXIO);
sc = device_get_softc(dev);
sc->dev = dev;
node = ofw_bus_get_node(sc->dev);
if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0)
sc->freq = cell / 1000000;
else
return (ENXIO);
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);
}
rk30_wd_sc = sc;
mtx_init(&sc->mtx, "RK30XX Watchdog", "rk30_wd", MTX_DEF);
EVENTHANDLER_REGISTER(watchdog_list, rk30_wd_watchdog_fn, sc, 0);
return (0);
}
static void
rk30_wd_watchdog_fn(void *private, u_int cmd, int *error)
{
struct rk30_wd_softc *sc;
uint64_t ms, m, max;
int i;
sc = private;
mtx_lock(&sc->mtx);
cmd &= WD_INTERVAL;
if (cmd > 0) {
ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
m = 0xffff / sc->freq;
max = 0x7fffffff / sc->freq + 1;
i = 0;
while (m < max && m < ms) {
m <<= 1;
i++;
}
if (m < max) {
RK30_WDT_WRITE(sc, WDOG_TORR,
i << WDOG_TORR_INTVL_SHIFT);
RK30_WDT_WRITE(sc, WDOG_CTRL,
WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE |
WDOG_CTRL_RST_PULSE);
RK30_WDT_WRITE(sc, WDOG_CRR, WDOG_CRR_PWD);
*error = 0;
} else {
device_printf(sc->dev, "Can not be disabled\n");
mtx_unlock(&sc->mtx);
RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
return;
}
}
else
RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
mtx_unlock(&sc->mtx);
}
void
rk30_wd_watchdog_reset()
{
bus_space_handle_t bsh;
bus_space_map(fdtbus_bs_tag, RK30_WDT_BASE, RK30_WDT_PSIZE, 0, &bsh);
bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_TORR, 0);
bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_CTRL,
WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE | WDOG_CTRL_RST_PULSE);
while (1);
}
static device_method_t rk30_wd_methods[] = {
DEVMETHOD(device_probe, rk30_wd_probe),
DEVMETHOD(device_attach, rk30_wd_attach),
DEVMETHOD_END
};
static driver_t rk30_wd_driver = {
"rk30_wd",
rk30_wd_methods,
sizeof(struct rk30_wd_softc),
};
static devclass_t rk30_wd_devclass;
DRIVER_MODULE(rk30_wd, simplebus, rk30_wd_driver, rk30_wd_devclass, 0, 0);
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