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 = SDHCI_QUIRK_WAIT_SEND_CMD;
  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         host->max_clk = max_clk;
  39
  40         add_sdhci(host, 0, 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_probe(struct udevice *dev)
  55 {
  56         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  57         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
  58         struct sdhci_host *host = dev_get_priv(dev);
  59         u32 max_clk;
  60         u32 caps, caps_1;
  61         u32 clk_base, clk_mul;
  62         ulong gck_rate;
  63         struct clk clk;
  64         int ret;
  65
  66         ret = clk_get_by_index(dev, 0, &clk);
  67         if (ret)
  68                 return ret;
  69
  70         ret = clk_enable(&clk);
  71         if (ret)
  72                 return ret;
  73
  74         host->name = dev->name;
  75         host->ioaddr = (void *)devfdt_get_addr(dev);
  76
  77         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  78         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  79                                          "bus-width", 4);
  80
  81         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
  82         clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
  83         caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
  84         clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
  85         gck_rate = clk_base * 1000000 * (clk_mul + 1);
  86
  87         ret = clk_get_by_index(dev, 1, &clk);
  88         if (ret)
  89                 return ret;
  90
  91         ret = clk_set_rate(&clk, gck_rate);
  92         if (ret)
  93                 return ret;
  94
  95         max_clk = clk_get_rate(&clk);
  96         if (!max_clk)
  97                 return -EINVAL;
  98
  99         host->max_clk = max_clk;
 100
 101         ret = sdhci_setup_cfg(&plat->cfg, host, 0, ATMEL_SDHC_MIN_FREQ);
 102         if (ret)
 103                 return ret;
 104
 105         host->mmc = &plat->mmc;
 106         host->mmc->dev = dev;
 107         host->mmc->priv = host;
 108         upriv->mmc = host->mmc;
 109
 110         clk_free(&clk);
 111
 112         return sdhci_probe(dev);
 113 }
 114
 115 static int atmel_sdhci_bind(struct udevice *dev)
 116 {
 117         struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
 118
 119         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 120 }
 121
 122 static const struct udevice_id atmel_sdhci_ids[] = {
 123         { .compatible = "atmel,sama5d2-sdhci" },
 124         { }
 125 };
 126
 127 U_BOOT_DRIVER(atmel_sdhci_drv) = {
 128         .name           = "atmel_sdhci",
 129         .id             = UCLASS_MMC,
 130         .of_match       = atmel_sdhci_ids,
 131         .ops            = &sdhci_ops,
 132         .bind           = atmel_sdhci_bind,
 133         .probe          = atmel_sdhci_probe,
 134         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 135         .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
 136 };
 137 #endif