freebsd-dev/sys/arm/rockchip/rk30xx_pmu.c

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/*-
* Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* PMU for Rockchip RK30xx */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include "rk30xx_pmu.h"
struct rk30_pmu_softc {
struct resource *res;
bus_space_tag_t bst;
bus_space_handle_t bsh;
};
static struct rk30_pmu_softc *rk30_pmu_sc = NULL;
#define pmu_read_4(sc, reg) \
bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
#define pmu_write_4(sc, reg, val) \
bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
static int
rk30_pmu_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-pmu")) {
device_set_desc(dev, "RK30XX PMU");
return(BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
rk30_pmu_attach(device_t dev)
{
struct rk30_pmu_softc *sc = device_get_softc(dev);
int rid = 0;
if (rk30_pmu_sc)
return (ENXIO);
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (!sc->res) {
device_printf(dev, "could not allocate resource\n");
return (ENXIO);
}
sc->bst = rman_get_bustag(sc->res);
sc->bsh = rman_get_bushandle(sc->res);
rk30_pmu_sc = sc;
return (0);
}
static device_method_t rk30_pmu_methods[] = {
DEVMETHOD(device_probe, rk30_pmu_probe),
DEVMETHOD(device_attach, rk30_pmu_attach),
{ 0, 0 }
};
static driver_t rk30_pmu_driver = {
"rk30_pmu",
rk30_pmu_methods,
sizeof(struct rk30_pmu_softc),
};
static devclass_t rk30_pmu_devclass;
DRIVER_MODULE(rk30_pmu, simplebus, rk30_pmu_driver, rk30_pmu_devclass, 0, 0);
void
rk30_pmu_gpio_pud(uint32_t pin, uint32_t state)
{
uint32_t offset;
offset = PMU_GPIO0A_PULL + ((pin / 8) * 4);
pin = (pin % 8) * 2;
pmu_write_4(rk30_pmu_sc, offset, (0x3 << (16 + pin)) | (state << pin));
}