drivers/mmc/atmel_sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Atmel Corporation
   4  *                    Wenyou.Yang <wenyou.yang@atmel.com>
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <dm.h>
  10 #include <malloc.h>
  11 #include <sdhci.h>
  12 #include <asm/arch/clk.h>
  13 #include <asm/global_data.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_deferred_probe(struct sdhci_host *host)
  56 {
  57         struct udevice *dev = host->mmc->dev;
  58
  59         return sdhci_probe(dev);
  60 }
  61
  62 static const struct sdhci_ops atmel_sdhci_ops = {
  63         .deferred_probe = atmel_sdhci_deferred_probe,
  64 };
  65
  66 static int atmel_sdhci_probe(struct udevice *dev)
  67 {
  68         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  69         struct atmel_sdhci_plat *plat = dev_get_plat(dev);
  70         struct sdhci_host *host = dev_get_priv(dev);
  71         u32 max_clk;
  72         struct clk clk;
  73         int ret;
  74
  75         ret = clk_get_by_index(dev, 0, &clk);
  76         if (ret)
  77                 return ret;
  78
  79         ret = clk_enable(&clk);
  80         if (ret)
  81                 return ret;
  82
  83         host->name = dev->name;
  84         host->ioaddr = dev_read_addr_ptr(dev);
  85
  86         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  87         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  88                                          "bus-width", 4);
  89
  90         ret = clk_get_by_index(dev, 1, &clk);
  91         if (ret)
  92                 return ret;
  93
  94         clk_set_rate(&clk, ATMEL_SDHC_GCK_RATE);
  95
  96         max_clk = clk_get_rate(&clk);
  97         if (!max_clk)
  98                 return -EINVAL;
  99
 100         ret = clk_enable(&clk);
 101         /* return error only if the clock really has a clock enable func */
 102         if (ret && ret != -ENOSYS)
 103                 return ret;
 104
 105         ret = mmc_of_parse(dev, &plat->cfg);
 106         if (ret)
 107                 return ret;
 108
 109         host->max_clk = max_clk;
 110         host->mmc = &plat->mmc;
 111         host->mmc->dev = dev;
 112
 113         ret = sdhci_setup_cfg(&plat->cfg, host, 0, ATMEL_SDHC_MIN_FREQ);
 114         if (ret)
 115                 return ret;
 116
 117         host->mmc->priv = host;
 118         host->ops = &atmel_sdhci_ops;
 119         upriv->mmc = host->mmc;
 120
 121         clk_free(&clk);
 122
 123         return sdhci_probe(dev);
 124 }
 125
 126 static int atmel_sdhci_bind(struct udevice *dev)
 127 {
 128         struct atmel_sdhci_plat *plat = dev_get_plat(dev);
 129
 130         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 131 }
 132
 133 static const struct udevice_id atmel_sdhci_ids[] = {
 134         { .compatible = "atmel,sama5d2-sdhci" },
 135         { .compatible = "microchip,sam9x60-sdhci" },
 136         { .compatible = "microchip,sama7g5-sdhci" },
 137         { }
 138 };
 139
 140 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 141         .name           = "atmel_sdhci",
 142         .id             = UCLASS_MMC,
 143         .of_match       = atmel_sdhci_ids,
 144         .ops            = &sdhci_ops,
 145         .bind           = atmel_sdhci_bind,
 146         .probe          = atmel_sdhci_probe,
 147         .priv_auto      = sizeof(struct sdhci_host),
 148         .plat_auto      = sizeof(struct atmel_sdhci_plat),
 149 };
 150 #endif