dwmmc_rockchip.c

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    1 /*
    2  * Copyright 2017 Emmanuel Vadot <manu@freebsd.org>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are
    6  * met:
    7  *
    8  *  1. Redistributions of source code must retain the above copyright
    9  *     notice, this list of conditions and the following disclaimer.
   10  *  2. Redistributions in binary form must reproduce the above copyright
   11  *     notice, this list of conditions and the following disclaimer in the
   12  *     documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   17  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
   18  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   21  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/bus.h>
   33 #include <sys/module.h>
   34 #include <sys/queue.h>
   35 #include <sys/taskqueue.h>
   36 
   37 #include <machine/bus.h>
   38 
   39 #include <dev/mmc/bridge.h>
   40 #include <dev/mmc/mmc_fdt_helpers.h>
   41 
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 
   44 #include <dev/extres/clk/clk.h>
   45 
   46 #include <dev/mmc/host/dwmmc_var.h>
   47 
   48 #include "opt_mmccam.h"
   49 
   50 enum RKTYPE {
   51         RK2928 = 1,
   52         RK3288,
   53 };
   54 
   55 static struct ofw_compat_data compat_data[] = {
   56         {"rockchip,rk2928-dw-mshc",     RK2928},
   57         {"rockchip,rk3288-dw-mshc",     RK3288},
   58         {NULL,                          0},
   59 };
   60 
   61 static int dwmmc_rockchip_update_ios(struct dwmmc_softc *sc, struct mmc_ios *ios);
   62 
   63 static int
   64 rockchip_dwmmc_probe(device_t dev)
   65 {
   66 
   67         if (!ofw_bus_status_okay(dev))
   68                 return (ENXIO);
   69 
   70         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
   71                 return (ENXIO);
   72 
   73         device_set_desc(dev, "Synopsys DesignWare Mobile "
   74             "Storage Host Controller (RockChip)");
   75 
   76         return (BUS_PROBE_VENDOR);
   77 }
   78 
   79 static int
   80 rockchip_dwmmc_attach(device_t dev)
   81 {
   82         struct dwmmc_softc *sc;
   83         int type;
   84 
   85         sc = device_get_softc(dev);
   86         sc->hwtype = HWTYPE_ROCKCHIP;
   87         type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
   88 
   89         switch (type) {
   90         case RK2928:
   91                 sc->use_pio = 1;
   92                 break;
   93         }
   94 
   95         sc->update_ios = &dwmmc_rockchip_update_ios;
   96 
   97         return (dwmmc_attach(dev));
   98 }
   99 
  100 static int
  101 dwmmc_rockchip_update_ios(struct dwmmc_softc *sc, struct mmc_ios *ios)
  102 {
  103         unsigned int clock;
  104         int error;
  105 
  106         if (ios->clock && ios->clock != sc->bus_hz) {
  107                 sc->bus_hz = clock = ios->clock;
  108                 /* Set the MMC clock. */
  109                 if (sc->ciu) {
  110                         /* 
  111                          * Apparently you need to set the ciu clock to
  112                          * the double of bus_hz
  113                          */
  114                         error = clk_set_freq(sc->ciu, clock * 2,
  115                             CLK_SET_ROUND_DOWN);
  116                         if (error != 0) {
  117                                 device_printf(sc->dev,
  118                                     "failed to set frequency to %u Hz: %d\n",
  119                                     clock, error);
  120                                 return (error);
  121                         }
  122                 }
  123         }
  124         return (0);
  125 }
  126 
  127 static device_method_t rockchip_dwmmc_methods[] = {
  128         /* bus interface */
  129         DEVMETHOD(device_probe, rockchip_dwmmc_probe),
  130         DEVMETHOD(device_attach, rockchip_dwmmc_attach),
  131         DEVMETHOD(device_detach, dwmmc_detach),
  132 
  133         DEVMETHOD_END
  134 };
  135 
  136 DEFINE_CLASS_1(rockchip_dwmmc, rockchip_dwmmc_driver, rockchip_dwmmc_methods,
  137     sizeof(struct dwmmc_softc), dwmmc_driver);
  138 
  139 DRIVER_MODULE(rockchip_dwmmc, simplebus, rockchip_dwmmc_driver, 0, 0);
  140 DRIVER_MODULE(rockchip_dwmmc, ofwbus, rockchip_dwmmc_driver, NULL, NULL);
  141 #ifndef MMCCAM
  142 MMC_DECLARE_BRIDGE(rockchip_dwmmc);
  143 #endif

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FreeBSD/Linux Kernel Cross Reference sys/dev/mmc/host/dwmmc_rockchip.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mmc/host/dwmmc_rockchip.c