191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2021 Emmanuel Vadot <manu@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/gpio.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/extres/clk/clk.h>
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#include "mmc_pwrseq_if.h"
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enum pwrseq_type {
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PWRSEQ_SIMPLE = 1,
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PWRSEQ_EMMC,
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};
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static struct ofw_compat_data compat_data[] = {
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{ "mmc-pwrseq-simple", PWRSEQ_SIMPLE },
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{ "mmc-pwrseq-emmc", PWRSEQ_EMMC },
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{ NULL, 0 }
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};
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struct mmc_pwrseq_softc {
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enum pwrseq_type type;
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clk_t ext_clock;
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struct gpiobus_pin *reset_gpio;
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uint32_t post_power_on_delay_ms;
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uint32_t power_off_delay_us;
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};
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static int
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mmc_pwrseq_probe(device_t dev)
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{
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enum pwrseq_type type;
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if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
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return (ENXIO);
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type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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switch (type) {
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case PWRSEQ_SIMPLE:
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device_set_desc(dev, "MMC Simple Power sequence");
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break;
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case PWRSEQ_EMMC:
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device_set_desc(dev, "MMC eMMC Power sequence");
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break;
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}
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return (BUS_PROBE_DEFAULT);
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}
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static int
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mmc_pwrseq_attach(device_t dev)
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{
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struct mmc_pwrseq_softc *sc;
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phandle_t node;
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int rv;
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sc = device_get_softc(dev);
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sc->type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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node = ofw_bus_get_node(dev);
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if (sc->type == PWRSEQ_SIMPLE) {
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if (OF_hasprop(node, "clocks")) {
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rv = clk_get_by_ofw_name(dev, 0, "ext_clock", &sc->ext_clock);
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if (rv != 0) {
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device_printf(dev,
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"Node have a clocks property but no clocks named \"ext_clock\"\n");
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return (ENXIO);
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}
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}
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OF_getencprop(node, "post-power-on-delay-ms", &sc->post_power_on_delay_ms, sizeof(uint32_t));
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OF_getencprop(node, "power-off-delay-us", &sc->power_off_delay_us, sizeof(uint32_t));
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}
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if (OF_hasprop(node, "reset-gpios")) {
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if (gpio_pin_get_by_ofw_property(dev, node, "reset-gpios",
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&sc->reset_gpio) != 0) {
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device_printf(dev, "Cannot get the reset-gpios\n");
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return (ENXIO);
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}
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gpio_pin_setflags(sc->reset_gpio, GPIO_PIN_OUTPUT);
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gpio_pin_set_active(sc->reset_gpio, true);
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}
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OF_device_register_xref(OF_xref_from_node(node), dev);
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return (0);
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}
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static int
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mmc_pwrseq_detach(device_t dev)
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{
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return (EBUSY);
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}
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static int
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mmv_pwrseq_set_power(device_t dev, bool power_on)
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{
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struct mmc_pwrseq_softc *sc;
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int rv;
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sc = device_get_softc(dev);
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if (power_on) {
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if (sc->ext_clock) {
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rv = clk_enable(sc->ext_clock);
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if (rv != 0)
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return (rv);
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}
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if (sc->reset_gpio) {
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rv = gpio_pin_set_active(sc->reset_gpio, false);
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if (rv != 0)
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return (rv);
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}
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if (sc->post_power_on_delay_ms)
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DELAY(sc->post_power_on_delay_ms * 1000);
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} else {
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if (sc->reset_gpio) {
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rv = gpio_pin_set_active(sc->reset_gpio, true);
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if (rv != 0)
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return (rv);
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}
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if (sc->ext_clock) {
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rv = clk_stop(sc->ext_clock);
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if (rv != 0)
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return (rv);
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}
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if (sc->power_off_delay_us)
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DELAY(sc->power_off_delay_us);
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}
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return (0);
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}
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static device_method_t mmc_pwrseq_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, mmc_pwrseq_probe),
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DEVMETHOD(device_attach, mmc_pwrseq_attach),
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DEVMETHOD(device_detach, mmc_pwrseq_detach),
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DEVMETHOD(mmc_pwrseq_set_power, mmv_pwrseq_set_power),
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DEVMETHOD_END
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};
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static driver_t mmc_pwrseq_driver = {
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"mmc_pwrseq",
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mmc_pwrseq_methods,
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sizeof(struct mmc_pwrseq_softc),
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};
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EARLY_DRIVER_MODULE(mmc_pwrseq, simplebus, mmc_pwrseq_driver, 0, 0,
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BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_FIRST);
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MODULE_VERSION(mmc_pwrseq, 1);
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SIMPLEBUS_PNP_INFO(compat_data);
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