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_probe(struct udevice *dev)
  54 {
  55         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  56         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
  57         struct sdhci_host *host = dev_get_priv(dev);
  58         u32 max_clk;
  59         u32 caps, caps_1;
  60         u32 clk_base, clk_mul;
  61         ulong gck_rate;
  62         struct clk clk;
  63         int ret;
  64
  65         ret = clk_get_by_index(dev, 0, &clk);
  66         if (ret)
  67                 return ret;
  68
  69         ret = clk_enable(&clk);
  70         if (ret)
  71                 return ret;
  72
  73         host->name = dev->name;
  74         host->ioaddr = (void *)dev_get_addr(dev);
  75
  76         host->quirks = 0;
  77         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  78                                          "bus-width", 4);
  79
  80         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
  81         clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
  82         caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
  83         clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
  84         gck_rate = clk_base * 1000000 * (clk_mul + 1);
  85
  86         ret = clk_get_by_index(dev, 1, &clk);
  87         if (ret)
  88                 return ret;
  89
  90         ret = clk_set_rate(&clk, gck_rate);
  91         if (ret)
  92                 return ret;
  93
  94         max_clk = clk_get_rate(&clk);
  95         if (!max_clk)
  96                 return -EINVAL;
  97
  98         ret = sdhci_setup_cfg(&plat->cfg, host, max_clk, ATMEL_SDHC_MIN_FREQ);
  99         if (ret)
 100                 return ret;
 101
 102         host->mmc = &plat->mmc;
 103         host->mmc->dev = dev;
 104         host->mmc->priv = host;
 105         upriv->mmc = host->mmc;
 106
 107         clk_free(&clk);
 108
 109         return sdhci_probe(dev);
 110 }
 111
 112 static int atmel_sdhci_bind(struct udevice *dev)
 113 {
 114         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
 115
 116         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 117 }
 118
 119 static const struct udevice_id atmel_sdhci_ids[] = {
 120         { .compatible = "atmel,sama5d2-sdhci" },
 121         { }
 122 };
 123
 124 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 125         .name           = "atmel_sdhci",
 126         .id             = UCLASS_MMC,
 127         .of_match       = atmel_sdhci_ids,
 128         .ops            = &sdhci_ops,
 129         .bind           = atmel_sdhci_bind,
 130         .probe          = atmel_sdhci_probe,
 131         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 132         .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
 133 };
 134 #endif