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

     /*
      * Copyright 2019 Emmanuel Vadot <manu@freebsd.org>
      * Copyright (c) 2017 Ian Lepore <ian@freebsd.org> All rights reserved.
      *
      * 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/bus.h>
    #include <sys/kernel.h>
    #include <sys/gpio.h>
    #include <sys/taskqueue.h>
    
    #include <dev/mmc/bridge.h>
    #include <dev/mmc/mmc_helpers.h>
    
    static inline void
    mmc_parse_sd_speed(device_t dev, struct mmc_host *host)
    {
            bool no_18v = false;
    
            /*
             * Parse SD supported modes
             * All UHS-I modes requires 1.8V signaling.
             */
            if (device_has_property(dev, "no-1-8-v"))
                    no_18v = true;
            if (device_has_property(dev, "cap-sd-highspeed"))
                    host->caps |= MMC_CAP_HSPEED;
            if (device_has_property(dev, "sd-uhs-sdr12") && !no_18v)
                    host->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "sd-uhs-sdr25") && !no_18v)
                    host->caps |= MMC_CAP_UHS_SDR25 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "sd-uhs-sdr50") && !no_18v)
                    host->caps |= MMC_CAP_UHS_SDR50 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "sd-uhs-sdr104") && !no_18v)
                    host->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "sd-uhs-ddr50") && !no_18v)
                    host->caps |= MMC_CAP_UHS_DDR50 | MMC_CAP_SIGNALING_180;
    }
    
    static inline void
    mmc_parse_mmc_speed(device_t dev, struct mmc_host *host)
    {
            /* Parse eMMC supported modes */
            if (device_has_property(dev, "cap-mmc-highspeed"))
                    host->caps |= MMC_CAP_HSPEED;
            if (device_has_property(dev, "mmc-ddr-1_2v"))
                    host->caps |= MMC_CAP_MMC_DDR52_120 | MMC_CAP_SIGNALING_120;
            if (device_has_property(dev, "mmc-ddr-1_8v"))
                    host->caps |= MMC_CAP_MMC_DDR52_180 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "mmc-ddr-3_3v"))
                    host->caps |= MMC_CAP_SIGNALING_330;
            if (device_has_property(dev, "mmc-hs200-1_2v"))
                    host->caps |= MMC_CAP_MMC_HS200_120 | MMC_CAP_SIGNALING_120;
            if (device_has_property(dev, "mmc-hs200-1_8v"))
                    host->caps |= MMC_CAP_MMC_HS200_180 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "mmc-hs400-1_2v"))
                    host->caps |= MMC_CAP_MMC_HS400_120 | MMC_CAP_SIGNALING_120;
            if (device_has_property(dev, "mmc-hs400-1_8v"))
                    host->caps |= MMC_CAP_MMC_HS400_180 | MMC_CAP_SIGNALING_180;
            if (device_has_property(dev, "mmc-hs400-enhanced-strobe"))
                    host->caps |= MMC_CAP_MMC_ENH_STROBE;
    }
    
    int
    mmc_parse(device_t dev, struct mmc_helper *helper, struct mmc_host *host)
    {
            uint32_t bus_width, max_freq;
    
            bus_width = 0;
            if (device_get_property(dev, "bus-width", &bus_width,
                sizeof(bus_width), DEVICE_PROP_UINT32) <= 0)
                    bus_width = 1;
    
            if (bus_width >= 4)
                   host->caps |= MMC_CAP_4_BIT_DATA;
           if (bus_width >= 8)
                   host->caps |= MMC_CAP_8_BIT_DATA;
   
           /*
            * max-frequency is optional, drivers should tweak this value
            * if it's not present based on the clock that the mmc controller
            * operates on
            */
           if (device_get_property(dev, "max-frequency", &max_freq,
               sizeof(max_freq), DEVICE_PROP_UINT32) > 0)
                   host->f_max = max_freq;
   
           if (device_has_property(dev, "broken-cd"))
                   helper->props |= MMC_PROP_BROKEN_CD;
           if (device_has_property(dev, "non-removable"))
                   helper->props |= MMC_PROP_NON_REMOVABLE;
           if (device_has_property(dev, "wp-inverted"))
                   helper->props |= MMC_PROP_WP_INVERTED;
           if (device_has_property(dev, "cd-inverted"))
                   helper->props |= MMC_PROP_CD_INVERTED;
           if (device_has_property(dev, "no-sdio"))
                   helper->props |= MMC_PROP_NO_SDIO;
           if (device_has_property(dev, "no-sd"))
                   helper->props |= MMC_PROP_NO_SD;
           if (device_has_property(dev, "no-mmc"))
                   helper->props |= MMC_PROP_NO_MMC;
   
           if (!(helper->props & MMC_PROP_NO_SD))
                   mmc_parse_sd_speed(dev, host);
   
           if (!(helper->props & MMC_PROP_NO_MMC))
                   mmc_parse_mmc_speed(dev, host);
   
           return (0);
   }

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