drivers/mmc/atmel_sdhci.c

   1 /*
   2  * Copyright (C) 2015 Atmel Corporation
   3  *                    Wenyou.Yang <wenyou.yang@atmel.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk.h>
  10 #include <dm.h>
  11 #include <malloc.h>
  12 #include <sdhci.h>
  13 #include <asm/arch/clk.h>
  14
  15 #define ATMEL_SDHC_MIN_FREQ     400000
  16 #define ATMEL_SDHC_GCK_RATE     240000000
  17
  18 #ifndef CONFIG_DM_MMC
  19 int atmel_sdhci_init(void *regbase, u32 id)
  20 {
  21         struct sdhci_host *host;
  22         u32 max_clk, min_clk = ATMEL_SDHC_MIN_FREQ;
  23
  24         host = (struct sdhci_host *)calloc(1, sizeof(struct sdhci_host));
  25         if (!host) {
  26                 printf("%s: sdhci_host calloc failed\n", __func__);
  27                 return -ENOMEM;
  28         }
  29
  30         host->name = "atmel_sdhci";
  31         host->ioaddr = regbase;
  32         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  33         max_clk = at91_get_periph_generated_clk(id);
  34         if (!max_clk) {
  35                 printf("%s: Failed to get the proper clock\n", __func__);
  36                 free(host);
  37                 return -ENODEV;
  38         }
  39         host->max_clk = max_clk;
  40
  41         add_sdhci(host, 0, min_clk);
  42
  43         return 0;
  44 }
  45
  46 #else
  47
  48 DECLARE_GLOBAL_DATA_PTR;
  49
  50 struct atmel_sdhci_plat {
  51         struct mmc_config cfg;
  52         struct mmc mmc;
  53 };
  54
  55 static int atmel_sdhci_probe(struct udevice *dev)
  56 {
  57         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  58         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
  59         struct sdhci_host *host = dev_get_priv(dev);
  60         u32 max_clk;
  61         struct clk clk;
  62         int ret;
  63
  64         ret = clk_get_by_index(dev, 0, &clk);
  65         if (ret)
  66                 return ret;
  67
  68         ret = clk_enable(&clk);
  69         if (ret)
  70                 return ret;
  71
  72         host->name = dev->name;
  73         host->ioaddr = (void *)devfdt_get_addr(dev);
  74
  75         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  76         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  77                                          "bus-width", 4);
  78
  79         ret = clk_get_by_index(dev, 1, &clk);
  80         if (ret)
  81                 return ret;
  82
  83         ret = clk_set_rate(&clk, ATMEL_SDHC_GCK_RATE);
  84         if (ret)
  85                 return ret;
  86
  87         max_clk = clk_get_rate(&clk);
  88         if (!max_clk)
  89                 return -EINVAL;
  90
  91         host->max_clk = max_clk;
  92
  93         ret = sdhci_setup_cfg(&plat->cfg, host, 0, ATMEL_SDHC_MIN_FREQ);
  94         if (ret)
  95                 return ret;
  96
  97         host->mmc = &plat->mmc;
  98         host->mmc->dev = dev;
  99         host->mmc->priv = host;
 100         upriv->mmc = host->mmc;
 101
 102         clk_free(&clk);
 103
 104         return sdhci_probe(dev);
 105 }
 106
 107 static int atmel_sdhci_bind(struct udevice *dev)
 108 {
 109         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
 110
 111         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 112 }
 113
 114 static const struct udevice_id atmel_sdhci_ids[] = {
 115         { .compatible = "atmel,sama5d2-sdhci" },
 116         { }
 117 };
 118
 119 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 120         .name           = "atmel_sdhci",
 121         .id             = UCLASS_MMC,
 122         .of_match       = atmel_sdhci_ids,
 123         .ops            = &sdhci_ops,
 124         .bind           = atmel_sdhci_bind,
 125         .probe          = atmel_sdhci_probe,
 126         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 127         .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
 128 };
 129 #endif