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/* $OpenBSD: exmct.c,v 1.6 2021/10/24 17:52:27 mpi Exp $ */
/*
* Copyright (c) 2012-2013 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 <arm/cpufunc.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* registers */
#define MCT_CTRL 0x240
#define MCT_WRITE_STAT 0x24C
/* bits and bytes */
#define MCT_CTRL_START (1 << 8)
struct exmct_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct exmct_softc *exmct_sc;
int exmct_match(struct device *, void *, void *);
void exmct_attach(struct device *, struct device *, void *);
void exmct_stop(void);
void exmct_reset(void);
const struct cfattach exmct_ca = {
sizeof (struct exmct_softc), exmct_match, exmct_attach
};
struct cfdriver exmct_cd = {
NULL, "exmct", DV_DULL
};
int
exmct_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "samsung,exynos4210-mct");
}
void
exmct_attach(struct device *parent, struct device *self, void *aux)
{
struct exmct_softc *sc = (struct exmct_softc *)self;
struct fdt_attach_args *faa = aux;
uint32_t i, mask, reg;
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");
exmct_sc = sc;
extern void agtimer_delay(u_int);
arm_clock_register(NULL, agtimer_delay, NULL, NULL);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, MCT_CTRL,
bus_space_read_4(sc->sc_iot, sc->sc_ioh, MCT_CTRL) | MCT_CTRL_START);
mask = (1 << 16);
/* Wait 10 times until written value is applied */
for (i = 0; i < 10; i++) {
reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, MCT_WRITE_STAT);
if (reg & mask) {
bus_space_write_4(sc->sc_iot, sc->sc_ioh,
MCT_WRITE_STAT, mask);
return;
}
cpufunc_nullop();
}
/* NOTREACHED */
panic("%s: can't enable timer!", __func__);
}
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