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

     /*
      * Copyright 2017 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>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/module.h>
    #include <sys/queue.h>
    #include <sys/taskqueue.h>
    
    #include <machine/bus.h>
    
    #include <dev/mmc/bridge.h>
    #include <dev/mmc/mmc_fdt_helpers.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <dev/mmc/host/dwmmc_var.h>
    #include <dev/mmc/host/dwmmc_reg.h>
    
    #define WRITE4(_sc, _reg, _val)         \
            bus_write_4((_sc)->res[0], _reg, _val)
    
    static struct ofw_compat_data compat_data[] = {
            {"samsung,exynos5420-dw-mshc",  1},
            {NULL,                          0},
    };
    
    static int
    samsung_dwmmc_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                    return (ENXIO);
    
            device_set_desc(dev, "Synopsys DesignWare Mobile "
                "Storage Host Controller (Samsung)");
    
            return (BUS_PROBE_VENDOR);
    }
    
    static int
    samsung_dwmmc_attach(device_t dev)
    {
            struct dwmmc_softc *sc;
            pcell_t dts_value[3];
            phandle_t node;
            int len;
    
            sc = device_get_softc(dev);
            sc->hwtype = HWTYPE_EXYNOS;
    
            if ((node = ofw_bus_get_node(sc->dev)) == -1)
                    return (ENXIO);
    
            if ((len = OF_getproplen(node, "samsung,dw-mshc-ciu-div")) <= 0)
                    return (ENXIO);
            OF_getencprop(node, "samsung,dw-mshc-ciu-div", dts_value, len);
            sc->sdr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
            sc->ddr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
    
            if ((len = OF_getproplen(node, "samsung,dw-mshc-sdr-timing")) <= 0)
                    return (ENXIO);
            OF_getencprop(node, "samsung,dw-mshc-sdr-timing", dts_value, len);
            sc->sdr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
                              (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
    
            if ((len = OF_getproplen(node, "samsung,dw-mshc-ddr-timing")) <= 0)
                    return (ENXIO);
           OF_getencprop(node, "samsung,dw-mshc-ddr-timing", dts_value, len);
           sc->ddr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
                             (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
   
           WRITE4(sc, EMMCP_MPSBEGIN0, 0);
           WRITE4(sc, EMMCP_SEND0, 0);
           WRITE4(sc, EMMCP_CTRL0, (MPSCTRL_SECURE_READ_BIT |
               MPSCTRL_SECURE_WRITE_BIT |
               MPSCTRL_NON_SECURE_READ_BIT |
               MPSCTRL_NON_SECURE_WRITE_BIT |
               MPSCTRL_VALID));
   
           return (dwmmc_attach(dev));
   }
   
   static device_method_t samsung_dwmmc_methods[] = {
           /* bus interface */
           DEVMETHOD(device_probe, samsung_dwmmc_probe),
           DEVMETHOD(device_attach, samsung_dwmmc_attach),
   
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_1(samsung_dwmmc, samsung_dwmmc_driver, samsung_dwmmc_methods,
       sizeof(struct dwmmc_softc), dwmmc_driver);
   
   DRIVER_MODULE(samsung_dwmmc, simplebus, samsung_dwmmc_driver, 0, 0);
   DRIVER_MODULE(samsung_dwmmc, ofwbus, samsung_dwmmc_driver, NULL, NULL);
   #ifndef MMCCAM
   MMC_DECLARE_BRIDGE(samsung_dwmmc);
   #endif

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