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/* $OpenBSD: bcm2835_dog.c,v 1.2 2019/09/05 16:58:36 patrick Exp $ */
/*
* Copyright (c) 2015 Patrick Wildt <patrick@blueri.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/evcount.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
extern void (*cpuresetfn)(void);
/* registers */
#define PM_RSTC 0x1c
#define PM_RSTS 0x20
#define PM_WDOG 0x24
/* bits and bytes */
#define PM_PASSWORD 0x5a000000
#define PM_RSTC_CONFIGMASK 0x00000030
#define PM_RSTC_FULL_RESET 0x00000020
#define PM_RSTC_RESET 0x00000102
#define PM_WDOG_TIMEMASK 0x000fffff
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct bcmdog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct bcmdog_softc *bcmdog_sc;
int bcmdog_match(struct device *, void *, void *);
void bcmdog_attach(struct device *, struct device *, void *);
int bcmdog_activate(struct device *, int);
int bcmdog_wdog_cb(void *, int);
void bcmdog_wdog_reset(void);
struct cfattach bcmdog_ca = {
sizeof (struct bcmdog_softc), bcmdog_match, bcmdog_attach, NULL,
bcmdog_activate
};
struct cfdriver bcmdog_cd = {
NULL, "bcmdog", DV_DULL
};
int
bcmdog_match(struct device *parent, void *cfdata, void *aux)
{
struct fdt_attach_args *fa = aux;
return OF_is_compatible(fa->fa_node, "brcm,bcm2835-pm-wdt");
}
void
bcmdog_attach(struct device *parent, struct device *self, void *aux)
{
struct bcmdog_softc *sc = (struct bcmdog_softc *)self;
struct fdt_attach_args *fa = aux;
sc->sc_iot = fa->fa_iot;
if (bus_space_map(sc->sc_iot, fa->fa_reg[0].addr,
fa->fa_reg[0].size, 0, &sc->sc_ioh))
panic("%s: bus_space_map failed!", __func__);
printf("\n");
bcmdog_sc = sc;
cpuresetfn = bcmdog_wdog_reset;
#ifndef SMALL_KERNEL
wdog_register(bcmdog_wdog_cb, sc);
#endif
}
int
bcmdog_activate(struct device *self, int act)
{
switch (act) {
case DVACT_POWERDOWN:
#ifndef SMALL_KERNEL
wdog_shutdown(self);
#endif
break;
}
return 0;
}
void
bcmdog_wdog_set(struct bcmdog_softc *sc, uint32_t period)
{
uint32_t rstc, wdog;
if (period == 0) {
HWRITE4(sc, PM_RSTC, PM_RSTC_RESET | PM_PASSWORD);
return;
}
rstc = HREAD4(sc, PM_RSTC) & PM_RSTC_CONFIGMASK;
rstc |= PM_RSTC_FULL_RESET;
rstc |= PM_PASSWORD;
wdog = period & PM_WDOG_TIMEMASK;
wdog |= PM_PASSWORD;
HWRITE4(sc, PM_WDOG, wdog);
HWRITE4(sc, PM_RSTC, rstc);
}
int
bcmdog_wdog_cb(void *self, int period)
{
struct bcmdog_softc *sc = self;
bcmdog_wdog_set(sc, period << 16);
return period;
}
void
bcmdog_wdog_reset(void)
{
struct bcmdog_softc *sc = bcmdog_sc;
bcmdog_wdog_set(sc, 10);
delay(100000);
}
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