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/* $OpenBSD: amlreset.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */
/*
* Copyright (c) 2019 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/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/fdt.h>
#define RESET0_REGISTER 0x0000
#define RESET0_MASK 0x003c
#define RESET0_LEVEL 0x007c
#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 amlreset_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct reset_device sc_rd;
};
int amlreset_match(struct device *, void *, void *);
void amlreset_attach(struct device *, struct device *, void *);
const struct cfattach amlreset_ca = {
sizeof (struct amlreset_softc), amlreset_match, amlreset_attach
};
struct cfdriver amlreset_cd = {
NULL, "amlreset", DV_DULL
};
void amlreset_reset(void *, uint32_t *, int);
int
amlreset_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "amlogic,meson-axg-reset");
}
void
amlreset_attach(struct device *parent, struct device *self, void *aux)
{
struct amlreset_softc *sc = (struct amlreset_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");
sc->sc_rd.rd_node = faa->fa_node;
sc->sc_rd.rd_cookie = sc;
sc->sc_rd.rd_reset = amlreset_reset;
reset_register(&sc->sc_rd);
}
void
amlreset_reset(void *cookie, uint32_t *cells, int assert)
{
struct amlreset_softc *sc = cookie;
uint32_t bank = cells[0] / 32;
uint32_t bit = cells[0] % 32;
if (assert)
HCLR4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
else
HSET4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
}
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