drivers/mmc/zynq_sdhci.c

   1 /*
   2  * (C) Copyright 2013 - 2015 Xilinx, Inc.
   3  *
   4  * Xilinx Zynq SD Host Controller Interface
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <clk.h>
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <libfdt.h>
  14 #include <malloc.h>
  15 #include <sdhci.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 #ifndef CONFIG_ZYNQ_SDHCI_MIN_FREQ
  20 # define CONFIG_ZYNQ_SDHCI_MIN_FREQ     0
  21 #endif
  22
  23 struct arasan_sdhci_plat {
  24         struct mmc_config cfg;
  25         struct mmc mmc;
  26         unsigned int f_max;
  27 };
  28
  29 static int arasan_sdhci_probe(struct udevice *dev)
  30 {
  31         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
  32         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  33         struct sdhci_host *host = dev_get_priv(dev);
  34         struct clk clk;
  35         unsigned long clock;
  36         int ret;
  37
  38         ret = clk_get_by_index(dev, 0, &clk);
  39         if (ret < 0) {
  40                 dev_err(dev, "failed to get clock\n");
  41                 return ret;
  42         }
  43
  44         clock = clk_get_rate(&clk);
  45         if (IS_ERR_VALUE(clock)) {
  46                 dev_err(dev, "failed to get rate\n");
  47                 return clock;
  48         }
  49         debug("%s: CLK %ld\n", __func__, clock);
  50
  51         ret = clk_enable(&clk);
  52         if (ret && ret != -ENOSYS) {
  53                 dev_err(dev, "failed to enable clock\n");
  54                 return ret;
  55         }
  56
  57         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
  58                        SDHCI_QUIRK_BROKEN_R1B;
  59
  60 #ifdef CONFIG_ZYNQ_HISPD_BROKEN
  61         host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
  62 #endif
  63
  64         host->max_clk = clock;
  65
  66         ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
  67                               CONFIG_ZYNQ_SDHCI_MIN_FREQ);
  68         host->mmc = &plat->mmc;
  69         if (ret)
  70                 return ret;
  71         host->mmc->priv = host;
  72         host->mmc->dev = dev;
  73         upriv->mmc = host->mmc;
  74
  75         return sdhci_probe(dev);
  76 }
  77
  78 static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
  79 {
  80         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
  81         struct sdhci_host *host = dev_get_priv(dev);
  82
  83         host->name = dev->name;
  84         host->ioaddr = (void *)devfdt_get_addr(dev);
  85
  86         plat->f_max = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  87                                 "max-frequency", CONFIG_ZYNQ_SDHCI_MAX_FREQ);
  88
  89         return 0;
  90 }
  91
  92 static int arasan_sdhci_bind(struct udevice *dev)
  93 {
  94         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
  95
  96         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  97 }
  98
  99 static const struct udevice_id arasan_sdhci_ids[] = {
 100         { .compatible = "arasan,sdhci-8.9a" },
 101         { }
 102 };
 103
 104 U_BOOT_DRIVER(arasan_sdhci_drv) = {
 105         .name           = "arasan_sdhci",
 106         .id             = UCLASS_MMC,
 107         .of_match       = arasan_sdhci_ids,
 108         .ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
 109         .ops            = &sdhci_ops,
 110         .bind           = arasan_sdhci_bind,
 111         .probe          = arasan_sdhci_probe,
 112         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 113         .platdata_auto_alloc_size = sizeof(struct arasan_sdhci_plat),
 114 };