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         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
  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
  40         add_sdhci(host, max_clk, min_clk);
  41
  42         return 0;
  43 }
  44
  45 #else
  46
  47 DECLARE_GLOBAL_DATA_PTR;
  48
  49 struct atmel_sdhci_plat {
  50         struct mmc_config cfg;
  51         struct mmc mmc;
  52 };
  53
  54 static int atmel_sdhci_get_clk(struct udevice *dev, int index, struct clk *clk)
  55 {
  56         struct udevice *dev_clk;
  57         int periph, ret;
  58
  59         ret = clk_get_by_index(dev, index, clk);
  60         if (ret)
  61                 return ret;
  62
  63         periph = fdtdec_get_uint(gd->fdt_blob, clk->dev->of_offset, "reg", -1);
  64         if (periph < 0)
  65                 return -EINVAL;
  66
  67         dev_clk = dev_get_parent(clk->dev);
  68         ret = clk_request(dev_clk, clk);
  69         if (ret)
  70                 return ret;
  71
  72         clk->id = periph;
  73
  74         return 0;
  75 }
  76
  77 static int atmel_sdhci_probe(struct udevice *dev)
  78 {
  79         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  80         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
  81         struct sdhci_host *host = dev_get_priv(dev);
  82         u32 max_clk;
  83         u32 caps, caps_1;
  84         u32 clk_base, clk_mul;
  85         ulong gck_rate;
  86         struct clk clk;
  87         int ret;
  88
  89         ret = atmel_sdhci_get_clk(dev, 0, &clk);
  90         if (ret)
  91                 return ret;
  92
  93         ret = clk_enable(&clk);
  94         if (ret)
  95                 return ret;
  96
  97         host->name = dev->name;
  98         host->ioaddr = (void *)dev_get_addr(dev);
  99
 100         host->quirks = 0;
 101         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 102                                          "bus-width", 4);
 103
 104         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 105         clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
 106         caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
 107         clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
 108         gck_rate = clk_base * 1000000 * (clk_mul + 1);
 109
 110         ret = atmel_sdhci_get_clk(dev, 1, &clk);
 111         if (ret)
 112                 return ret;
 113
 114         ret = clk_set_rate(&clk, gck_rate);
 115         if (ret)
 116                 return ret;
 117
 118         max_clk = clk_get_rate(&clk);
 119         if (!max_clk)
 120                 return -EINVAL;
 121
 122         ret = sdhci_setup_cfg(&plat->cfg, host, max_clk, ATMEL_SDHC_MIN_FREQ);
 123         if (ret)
 124                 return ret;
 125
 126         host->mmc = &plat->mmc;
 127         host->mmc->dev = dev;
 128         host->mmc->priv = host;
 129         upriv->mmc = host->mmc;
 130
 131         clk_free(&clk);
 132
 133         return sdhci_probe(dev);
 134 }
 135
 136 static int atmel_sdhci_bind(struct udevice *dev)
 137 {
 138         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
 139         int ret;
 140
 141         ret = sdhci_bind(dev, &plat->mmc, &plat->cfg);
 142         if (ret)
 143                 return ret;
 144
 145         return 0;
 146 }
 147
 148 static const struct udevice_id atmel_sdhci_ids[] = {
 149         { .compatible = "atmel,sama5d2-sdhci" },
 150         { }
 151 };
 152
 153 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 154         .name           = "atmel_sdhci",
 155         .id             = UCLASS_MMC,
 156         .of_match       = atmel_sdhci_ids,
 157         .ops            = &sdhci_ops,
 158         .bind           = atmel_sdhci_bind,
 159         .probe          = atmel_sdhci_probe,
 160         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 161         .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
 162 };
 163 #endif