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
  17 #ifndef CONFIG_DM_MMC
  18 int atmel_sdhci_init(void *regbase, u32 id)
  19 {
  20         struct sdhci_host *host;
  21         u32 max_clk, min_clk = ATMEL_SDHC_MIN_FREQ;
  22
  23         host = (struct sdhci_host *)calloc(1, sizeof(struct sdhci_host));
  24         if (!host) {
  25                 printf("%s: sdhci_host calloc failed\n", __func__);
  26                 return -ENOMEM;
  27         }
  28
  29         host->name = "atmel_sdhci";
  30         host->ioaddr = regbase;
  31         host->quirks = 0;
  32         max_clk = at91_get_periph_generated_clk(id);
  33         if (!max_clk) {
  34                 printf("%s: Failed to get the proper clock\n", __func__);
  35                 free(host);
  36                 return -ENODEV;
  37         }
  38
  39         add_sdhci(host, max_clk, min_clk);
  40
  41         return 0;
  42 }
  43
  44 #else
  45
  46 DECLARE_GLOBAL_DATA_PTR;
  47
  48 struct atmel_sdhci_plat {
  49         struct mmc_config cfg;
  50         struct mmc mmc;
  51 };
  52
  53 static int atmel_sdhci_get_clk(struct udevice *dev, int index, struct clk *clk)
  54 {
  55         struct udevice *dev_clk;
  56         int periph, ret;
  57
  58         ret = clk_get_by_index(dev, index, clk);
  59         if (ret)
  60                 return ret;
  61
  62         periph = fdtdec_get_uint(gd->fdt_blob, clk->dev->of_offset, "reg", -1);
  63         if (periph < 0)
  64                 return -EINVAL;
  65
  66         dev_clk = dev_get_parent(clk->dev);
  67         ret = clk_request(dev_clk, clk);
  68         if (ret)
  69                 return ret;
  70
  71         clk->id = periph;
  72
  73         return 0;
  74 }
  75
  76 static int atmel_sdhci_probe(struct udevice *dev)
  77 {
  78         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  79         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
  80         struct sdhci_host *host = dev_get_priv(dev);
  81         u32 max_clk;
  82         u32 caps, caps_1;
  83         u32 clk_base, clk_mul;
  84         ulong gck_rate;
  85         struct clk clk;
  86         int ret;
  87
  88         ret = atmel_sdhci_get_clk(dev, 0, &clk);
  89         if (ret)
  90                 return ret;
  91
  92         ret = clk_enable(&clk);
  93         if (ret)
  94                 return ret;
  95
  96         host->name = dev->name;
  97         host->ioaddr = (void *)dev_get_addr(dev);
  98
  99         host->quirks = 0;
 100         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 101                                          "bus-width", 4);
 102
 103         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 104         clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
 105         caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
 106         clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
 107         gck_rate = clk_base * 1000000 * (clk_mul + 1);
 108
 109         ret = atmel_sdhci_get_clk(dev, 1, &clk);
 110         if (ret)
 111                 return ret;
 112
 113         ret = clk_set_rate(&clk, gck_rate);
 114         if (ret)
 115                 return ret;
 116
 117         max_clk = clk_get_rate(&clk);
 118         if (!max_clk)
 119                 return -EINVAL;
 120
 121         ret = sdhci_setup_cfg(&plat->cfg, host, max_clk, ATMEL_SDHC_MIN_FREQ);
 122         if (ret)
 123                 return ret;
 124
 125         host->mmc = &plat->mmc;
 126         host->mmc->dev = dev;
 127         host->mmc->priv = host;
 128         upriv->mmc = host->mmc;
 129
 130         clk_free(&clk);
 131
 132         return sdhci_probe(dev);
 133 }
 134
 135 static int atmel_sdhci_bind(struct udevice *dev)
 136 {
 137         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
 138
 139         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 140 }
 141
 142 static const struct udevice_id atmel_sdhci_ids[] = {
 143         { .compatible = "atmel,sama5d2-sdhci" },
 144         { }
 145 };
 146
 147 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 148         .name           = "atmel_sdhci",
 149         .id             = UCLASS_MMC,
 150         .of_match       = atmel_sdhci_ids,
 151         .ops            = &sdhci_ops,
 152         .bind           = atmel_sdhci_bind,
 153         .probe          = atmel_sdhci_probe,
 154         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 155         .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
 156 };
 157 #endif