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/* $OpenBSD: syscon.c,v 1.7 2021/10/24 17:52:27 mpi 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>
#ifdef __armv7__
#include <arm/simplebus/simplebusvar.h>
#elif defined(__riscv64__)
#include <riscv64/dev/simplebusvar.h>
#else
#include <arm64/dev/simplebusvar.h>
#endif
extern void (*cpuresetfn)(void);
extern void (*powerdownfn)(void);
struct syscon_softc {
struct simplebus_softc sc_sbus;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint32_t sc_regmap;
bus_size_t sc_offset;
uint32_t sc_mask;
uint32_t sc_value;
};
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 *);
const 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") ||
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;
char name[32];
OF_getprop(faa->fa_node, "name", name, sizeof(name));
name[sizeof(name) - 1] = 0;
if (OF_is_compatible(faa->fa_node, "syscon")) {
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;
}
regmap_register(faa->fa_node, sc->sc_iot, sc->sc_ioh,
faa->fa_reg[0].size);
}
if (OF_is_compatible(faa->fa_node, "simple-mfd"))
simplebus_attach(parent, &sc->sc_sbus.sc_dev, faa);
else
printf(": \"%s\"\n", name);
if (OF_is_compatible(faa->fa_node, "syscon-reboot") ||
OF_is_compatible(faa->fa_node, "syscon-poweroff")) {
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))
return;
/* At least one of "mask" and "value" should be provided. */
if (OF_getproplen(faa->fa_node, "mask") != sizeof(uint32_t) &&
OF_getproplen(faa->fa_node, "value") != sizeof(uint32_t))
return;
sc->sc_offset = OF_getpropint(faa->fa_node, "offset", 0);
sc->sc_mask = OF_getpropint(faa->fa_node, "mask", 0xffffffff);
sc->sc_value = OF_getpropint(faa->fa_node, "value", 0);
/*
* Old binding used "mask" as the value to write with
* an all-ones mask. This is still supported.
*/
if (OF_getproplen(faa->fa_node, "value") != sizeof(uint32_t)) {
sc->sc_value = sc->sc_mask;
sc->sc_mask = 0xffffffff;
}
if (OF_is_compatible(faa->fa_node, "syscon-reboot")) {
syscon_reboot_sc = sc;
cpuresetfn = syscon_reset;
} else if (OF_is_compatible(faa->fa_node, "syscon-poweroff")) {
syscon_poweroff_sc = sc;
powerdownfn = syscon_powerdown;
}
}
}
void
syscon_reset(void)
{
struct syscon_softc *sc = syscon_reboot_sc;
struct regmap *rm;
uint32_t value;
rm = regmap_byphandle(sc->sc_regmap);
if (rm == NULL)
return;
value = regmap_read_4(rm, sc->sc_offset);
value &= ~sc->sc_mask;
value |= sc->sc_value;
regmap_write_4(rm, sc->sc_offset, value);
delay(1000000);
}
void
syscon_powerdown(void)
{
struct syscon_softc *sc = syscon_poweroff_sc;
struct regmap *rm;
uint32_t value;
rm = regmap_byphandle(sc->sc_regmap);
if (rm == NULL)
return;
value = regmap_read_4(rm, sc->sc_offset);
value &= ~sc->sc_mask;
value |= sc->sc_value;
regmap_write_4(rm, sc->sc_offset, value);
delay(1000000);
}
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