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/* $OpenBSD: apldog.c,v 1.1 2021/02/22 21:30:54 kettenis Exp $ */
/*
* Copyright (c) 2021 Mark Kettenis <kettenis@openbsd.org>
*
* 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/device.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
extern void (*cpuresetfn)(void);
/*
* This driver is based on preliminary device tree bindings and will
* almost certainly need changes once the official bindings land in
* mainline Linux. Support for these preliminary bindings will be
* dropped as soon as official bindings are available.
*/
#define WDT_CHIP_CTL 0x000c
#define WDT_SYS_TMR 0x0010
#define WDT_SYS_RST 0x0014
#define WDT_SYS_RST_IMMEDIATE (1 << 0)
#define WDT_SYS_CTL 0x001c
#define WDT_SYS_CTL_ENABLE (1 << 2)
#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))
struct apldog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct apldog_softc *apldog_sc;
int apldog_match(struct device *, void *, void *);
void apldog_attach(struct device *, struct device *, void *);
struct cfattach apldog_ca = {
sizeof (struct apldog_softc), apldog_match, apldog_attach
};
struct cfdriver apldog_cd = {
NULL, "apldog", DV_DULL
};
void apldog_reset(void);
int
apldog_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "apple,reboot-v0");
}
void
apldog_attach(struct device *parent, struct device *self, void *aux)
{
struct apldog_softc *sc = (struct apldog_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
printf("\n");
/* Reset the watchdog timers. */
HWRITE4(sc, WDT_CHIP_CTL, 0);
HWRITE4(sc, WDT_SYS_CTL, 0);
apldog_sc = sc;
cpuresetfn = apldog_reset;
}
void
apldog_reset(void)
{
struct apldog_softc *sc = apldog_sc;
/* Trigger a system reset. */
HWRITE4(sc, WDT_SYS_RST, WDT_SYS_RST_IMMEDIATE);
HWRITE4(sc, WDT_SYS_CTL, WDT_SYS_CTL_ENABLE);
HWRITE4(sc, WDT_SYS_TMR, 0);
delay(1000000);
}
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