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/* $OpenBSD: syscon.c,v 1.1 2017/03/09 20:04:21 kettenis Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis
*
* 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/ofw_misc.h>
#include <dev/ofw/fdt.h>
extern void (*cpuresetfn)(void);
extern void (*powerdownfn)(void);
struct syscon_softc {
struct device sc_dev;
uint32_t sc_regmap;
bus_size_t sc_offset;
uint32_t sc_mask;
};
struct syscon_softc *syscon_reboot_sc;
struct syscon_softc *syscon_poweroff_sc;
int syscon_match(struct device *, void *, void *);
void syscon_attach(struct device *, struct device *, void *);
struct cfattach syscon_ca = {
sizeof(struct syscon_softc), syscon_match, syscon_attach
};
struct cfdriver syscon_cd = {
NULL, "syscon", DV_DULL
};
void syscon_reset(void);
void syscon_powerdown(void);
int
syscon_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "syscon-reboot") ||
OF_is_compatible(faa->fa_node, "syscon-poweroff"));
}
void
syscon_attach(struct device *parent, struct device *self, void *aux)
{
struct syscon_softc *sc = (struct syscon_softc *)self;
struct fdt_attach_args *faa = aux;
printf("\n");
sc->sc_regmap = OF_getpropint(faa->fa_node, "regmap", 0);
if (sc->sc_regmap == 0)
return;
if (OF_getproplen(faa->fa_node, "offset") != sizeof(uint32_t) ||
OF_getproplen(faa->fa_node, "mask") != sizeof(uint32_t))
return;
sc->sc_offset = OF_getpropint(faa->fa_node, "offset", 0);
sc->sc_mask = OF_getpropint(faa->fa_node, "mask", 0);
if (OF_is_compatible(faa->fa_node, "syscon-reboot")) {
syscon_reboot_sc = sc;
cpuresetfn = syscon_reset;
} else {
syscon_poweroff_sc = sc;
powerdownfn = syscon_powerdown;
}
}
void
syscon_reset(void)
{
struct syscon_softc *sc = syscon_reboot_sc;
struct regmap *rm;
rm = regmap_byphandle(sc->sc_regmap);
if (rm == NULL)
return;
regmap_write_4(rm, sc->sc_offset, sc->sc_mask);
delay(1000000);
}
void
syscon_powerdown(void)
{
struct syscon_softc *sc = syscon_poweroff_sc;
struct regmap *rm;
rm = regmap_byphandle(sc->sc_regmap);
if (rm == NULL)
return;
regmap_write_4(rm, sc->sc_offset, sc->sc_mask);
delay(1000000);
}
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