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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright 2021 Emmanuel Vadot <manu@freebsd.org>
*
* 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.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/extres/clk/clk.h>
#include "mmc_pwrseq_if.h"
enum pwrseq_type {
PWRSEQ_SIMPLE = 1,
PWRSEQ_EMMC,
};
static struct ofw_compat_data compat_data[] = {
{ "mmc-pwrseq-simple", PWRSEQ_SIMPLE },
{ "mmc-pwrseq-emmc", PWRSEQ_EMMC },
{ NULL, 0 }
};
struct mmc_pwrseq_softc {
enum pwrseq_type type;
clk_t ext_clock;
struct gpiobus_pin *reset_gpio;
uint32_t post_power_on_delay_ms;
uint32_t power_off_delay_us;
};
static int
mmc_pwrseq_probe(device_t dev)
{
enum pwrseq_type type;
if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
return (ENXIO);
type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
switch (type) {
case PWRSEQ_SIMPLE:
device_set_desc(dev, "MMC Simple Power sequence");
break;
case PWRSEQ_EMMC:
device_set_desc(dev, "MMC eMMC Power sequence");
break;
}
return (BUS_PROBE_DEFAULT);
}
static int
mmc_pwrseq_attach(device_t dev)
{
struct mmc_pwrseq_softc *sc;
phandle_t node;
int rv;
sc = device_get_softc(dev);
sc->type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
node = ofw_bus_get_node(dev);
if (sc->type == PWRSEQ_SIMPLE) {
if (OF_hasprop(node, "clocks")) {
rv = clk_get_by_ofw_name(dev, 0, "ext_clock", &sc->ext_clock);
if (rv != 0) {
device_printf(dev,
"Node have a clocks property but no clocks named \"ext_clock\"\n");
return (ENXIO);
}
}
OF_getencprop(node, "post-power-on-delay-ms", &sc->post_power_on_delay_ms, sizeof(uint32_t));
OF_getencprop(node, "power-off-delay-us", &sc->power_off_delay_us, sizeof(uint32_t));
}
if (OF_hasprop(node, "reset-gpios")) {
if (gpio_pin_get_by_ofw_property(dev, node, "reset-gpios",
&sc->reset_gpio) != 0) {
device_printf(dev, "Cannot get the reset-gpios\n");
return (ENXIO);
}
gpio_pin_setflags(sc->reset_gpio, GPIO_PIN_OUTPUT);
gpio_pin_set_active(sc->reset_gpio, true);
}
OF_device_register_xref(OF_xref_from_node(node), dev);
return (0);
}
static int
mmc_pwrseq_detach(device_t dev)
{
return (EBUSY);
}
static int
mmv_pwrseq_set_power(device_t dev, bool power_on)
{
struct mmc_pwrseq_softc *sc;
int rv;
sc = device_get_softc(dev);
if (power_on) {
if (sc->ext_clock) {
rv = clk_enable(sc->ext_clock);
if (rv != 0)
return (rv);
}
if (sc->reset_gpio) {
rv = gpio_pin_set_active(sc->reset_gpio, false);
if (rv != 0)
return (rv);
}
if (sc->post_power_on_delay_ms)
DELAY(sc->post_power_on_delay_ms * 1000);
} else {
if (sc->reset_gpio) {
rv = gpio_pin_set_active(sc->reset_gpio, true);
if (rv != 0)
return (rv);
}
if (sc->ext_clock) {
rv = clk_stop(sc->ext_clock);
if (rv != 0)
return (rv);
}
if (sc->power_off_delay_us)
DELAY(sc->power_off_delay_us);
}
return (0);
}
static device_method_t mmc_pwrseq_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mmc_pwrseq_probe),
DEVMETHOD(device_attach, mmc_pwrseq_attach),
DEVMETHOD(device_detach, mmc_pwrseq_detach),
DEVMETHOD(mmc_pwrseq_set_power, mmv_pwrseq_set_power),
DEVMETHOD_END
};
static driver_t mmc_pwrseq_driver = {
"mmc_pwrseq",
mmc_pwrseq_methods,
sizeof(struct mmc_pwrseq_softc),
};
static devclass_t mmc_pwrseq_devclass;
EARLY_DRIVER_MODULE(mmc_pwrseq, simplebus, mmc_pwrseq_driver, mmc_pwrseq_devclass, 0, 0,
BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_FIRST);
MODULE_VERSION(mmc_pwrseq, 1);
SIMPLEBUS_PNP_INFO(compat_data);
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