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/* $OpenBSD: mvagc.c,v 1.1 2016/10/07 19:10:46 patrick Exp $ */
/*
* Copyright (c) 2016 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/device.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/fdt.h>
#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 mvagc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_node;
struct clock_device sc_cd;
};
int mvagc_match(struct device *, void *, void *);
void mvagc_attach(struct device *, struct device *, void *);
void mvagc_enable(void *, uint32_t *, int);
uint32_t mvagc_gen_get_frequency(void *, uint32_t *);
struct cfattach mvagc_ca = {
sizeof (struct mvagc_softc), mvagc_match, mvagc_attach
};
struct cfdriver mvagc_cd = {
NULL, "mvagc", DV_DULL
};
int
mvagc_match(struct device *parent, void *cfdata, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node,
"marvell,armada-380-gating-clock"));
}
void
mvagc_attach(struct device *parent, struct device *self, void *args)
{
struct mvagc_softc *sc = (struct mvagc_softc *)self;
struct fdt_attach_args *faa = args;
sc->sc_node = faa->fa_node;
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))
panic("%s: bus_space_map failed!", __func__);
printf("\n");
sc->sc_cd.cd_node = sc->sc_node;
sc->sc_cd.cd_cookie = sc;
sc->sc_cd.cd_get_frequency = mvagc_gen_get_frequency;
sc->sc_cd.cd_enable = mvagc_enable;
clock_register(&sc->sc_cd);
}
/*
* A "generic" function that simply gets the clock frequency from the
* parent clock. Useful for clock gating devices that don't scale
* their clocks.
*/
uint32_t
mvagc_gen_get_frequency(void *cookie, uint32_t *cells)
{
struct mvagc_softc *sc = cookie;
return clock_get_frequency(sc->sc_node, NULL);
}
void
mvagc_enable(void *cookie, uint32_t *cells, int on)
{
struct mvagc_softc *sc = cookie;
uint32_t id = cells[0];
if (id >= 32)
return;
if (on)
HSET4(sc, 0, (1 << id));
else
HCLR4(sc, 0, (1 << id));
}
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