mmc_pwrseq.c

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    1 /*
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright 2021 Emmanuel Vadot <manu@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are
    8  * met:
    9  *
   10  *  1. Redistributions of source code must retain the above copyright
   11  *     notice, this list of conditions and the following disclaimer.
   12  *  2. Redistributions in binary form must reproduce the above copyright
   13  *     notice, this list of conditions and the following disclaimer in the
   14  *     documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
   20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   23  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/gpio.h>
   37 
   38 #include <dev/gpio/gpiobusvar.h>
   39 #include <dev/ofw/ofw_bus.h>
   40 #include <dev/ofw/ofw_bus_subr.h>
   41 
   42 #include <dev/extres/clk/clk.h>
   43 
   44 #include "mmc_pwrseq_if.h"
   45 
   46 enum pwrseq_type {
   47         PWRSEQ_SIMPLE = 1,
   48         PWRSEQ_EMMC,
   49 };
   50 
   51 static struct ofw_compat_data compat_data[] = {
   52         { "mmc-pwrseq-simple",  PWRSEQ_SIMPLE },
   53         { "mmc-pwrseq-emmc",    PWRSEQ_EMMC },
   54         { NULL,                 0 }
   55 };
   56 
   57 struct mmc_pwrseq_softc {
   58         enum pwrseq_type        type;
   59         clk_t                   ext_clock;
   60         struct gpiobus_pin      *reset_gpio;
   61 
   62         uint32_t                post_power_on_delay_ms;
   63         uint32_t                power_off_delay_us;
   64 };
   65 
   66 static int
   67 mmc_pwrseq_probe(device_t dev)
   68 {
   69         enum pwrseq_type type;
   70 
   71         if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
   72                 return (ENXIO);
   73 
   74         type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
   75         switch (type) {
   76         case PWRSEQ_SIMPLE:
   77                 device_set_desc(dev, "MMC Simple Power sequence");
   78                 break;
   79         case PWRSEQ_EMMC:
   80                 device_set_desc(dev, "MMC eMMC Power sequence");
   81                 break;
   82         }
   83         return (BUS_PROBE_DEFAULT);
   84 }
   85 
   86 static int
   87 mmc_pwrseq_attach(device_t dev)
   88 {
   89         struct mmc_pwrseq_softc *sc;
   90         phandle_t node;
   91         int rv;
   92 
   93         sc = device_get_softc(dev);
   94         sc->type = (enum pwrseq_type)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
   95         node = ofw_bus_get_node(dev);
   96 
   97         if (sc->type == PWRSEQ_SIMPLE) {
   98                 if (OF_hasprop(node, "clocks")) {
   99                         rv = clk_get_by_ofw_name(dev, 0, "ext_clock", &sc->ext_clock);
  100                         if (rv != 0) {
  101                                 device_printf(dev,
  102                                     "Node have a clocks property but no clocks named \"ext_clock\"\n");
  103                                 return (ENXIO);
  104                         }
  105                 }
  106                 OF_getencprop(node, "post-power-on-delay-ms", &sc->post_power_on_delay_ms, sizeof(uint32_t));
  107                 OF_getencprop(node, "power-off-delay-us", &sc->power_off_delay_us, sizeof(uint32_t));
  108         }
  109 
  110         if (OF_hasprop(node, "reset-gpios")) {
  111                 if (gpio_pin_get_by_ofw_property(dev, node, "reset-gpios",
  112                     &sc->reset_gpio) != 0) {
  113                         device_printf(dev, "Cannot get the reset-gpios\n");
  114                         return (ENXIO);
  115                 }
  116                 gpio_pin_setflags(sc->reset_gpio, GPIO_PIN_OUTPUT);
  117                 gpio_pin_set_active(sc->reset_gpio, true);
  118         }
  119 
  120         OF_device_register_xref(OF_xref_from_node(node), dev);
  121         return (0);
  122 }
  123 
  124 static int
  125 mmc_pwrseq_detach(device_t dev)
  126 {
  127 
  128         return (EBUSY);
  129 }
  130 
  131 static int
  132 mmv_pwrseq_set_power(device_t dev, bool power_on)
  133 {
  134         struct mmc_pwrseq_softc *sc;
  135         int rv;
  136 
  137         sc = device_get_softc(dev);
  138 
  139         if (power_on) {
  140                 if (sc->ext_clock) {
  141                         rv = clk_enable(sc->ext_clock);
  142                         if (rv != 0)
  143                                 return (rv);
  144                 }
  145 
  146                 if (sc->reset_gpio) {
  147                         rv = gpio_pin_set_active(sc->reset_gpio, false);
  148                         if (rv != 0)
  149                                 return (rv);
  150                 }
  151 
  152                 if (sc->post_power_on_delay_ms)
  153                         DELAY(sc->post_power_on_delay_ms * 1000);
  154         } else {
  155                 if (sc->reset_gpio) {
  156                         rv = gpio_pin_set_active(sc->reset_gpio, true);
  157                         if (rv != 0)
  158                                 return (rv);
  159                 }
  160 
  161                 if (sc->ext_clock) {
  162                         rv = clk_stop(sc->ext_clock);
  163                         if (rv != 0)
  164                                 return (rv);
  165                 }
  166                 if (sc->power_off_delay_us)
  167                         DELAY(sc->power_off_delay_us);
  168         }
  169 
  170         return (0);
  171 }
  172 
  173 static device_method_t mmc_pwrseq_methods[] = {
  174         /* Device interface */
  175         DEVMETHOD(device_probe,         mmc_pwrseq_probe),
  176         DEVMETHOD(device_attach,        mmc_pwrseq_attach),
  177         DEVMETHOD(device_detach,        mmc_pwrseq_detach),
  178 
  179         DEVMETHOD(mmc_pwrseq_set_power, mmv_pwrseq_set_power),
  180         DEVMETHOD_END
  181 };
  182 
  183 static driver_t mmc_pwrseq_driver = {
  184         "mmc_pwrseq",
  185         mmc_pwrseq_methods,
  186         sizeof(struct mmc_pwrseq_softc),
  187 };
  188 
  189 EARLY_DRIVER_MODULE(mmc_pwrseq, simplebus, mmc_pwrseq_driver, 0, 0,
  190         BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_FIRST);
  191 MODULE_VERSION(mmc_pwrseq, 1);
  192 SIMPLEBUS_PNP_INFO(compat_data);

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FreeBSD/Linux Kernel Cross Reference sys/dev/mmc/mmc_pwrseq.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mmc/mmc_pwrseq.c