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
  14 #define ATMEL_SDHC_MIN_FREQ     400000
  15 #define ATMEL_SDHC_GCK_RATE     240000000
  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_plat(dev);
  58         struct sdhci_host *host = dev_get_priv(dev);
  59         u32 max_clk;
  60         struct clk clk;
  61         int ret;
  62
  63         ret = clk_get_by_index(dev, 0, &clk);
  64         if (ret)
  65                 return ret;
  66
  67         ret = clk_enable(&clk);
  68         if (ret)
  69                 return ret;
  70
  71         host->name = dev->name;
  72         host->ioaddr = dev_read_addr_ptr(dev);
  73
  74         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  75         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  76                                          "bus-width", 4);
  77
  78         ret = clk_get_by_index(dev, 1, &clk);
  79         if (ret)
  80                 return ret;
  81
  82         clk_set_rate(&clk, ATMEL_SDHC_GCK_RATE);
  83
  84         max_clk = clk_get_rate(&clk);
  85         if (!max_clk)
  86                 return -EINVAL;
  87
  88         ret = clk_enable(&clk);
  89         /* return error only if the clock really has a clock enable func */
  90         if (ret && ret != -ENOSYS)
  91                 return ret;
  92
  93         ret = mmc_of_parse(dev, &plat->cfg);
  94         if (ret)
  95                 return ret;
  96
  97         host->max_clk = max_clk;
  98         host->mmc = &plat->mmc;
  99         host->mmc->dev = dev;
 100
 101         ret = sdhci_setup_cfg(&plat->cfg, host, 0, ATMEL_SDHC_MIN_FREQ);
 102         if (ret)
 103                 return ret;
 104
 105         host->mmc->priv = host;
 106         upriv->mmc = host->mmc;
 107
 108         clk_free(&clk);
 109
 110         return sdhci_probe(dev);
 111 }
 112
 113 static int atmel_sdhci_bind(struct udevice *dev)
 114 {
 115         struct atmel_sdhci_plat *plat = dev_get_plat(dev);
 116
 117         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 118 }
 119
 120 static const struct udevice_id atmel_sdhci_ids[] = {
 121         { .compatible = "atmel,sama5d2-sdhci" },
 122         { .compatible = "microchip,sam9x60-sdhci" },
 123         { .compatible = "microchip,sama7g5-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      = sizeof(struct sdhci_host),
 135         .plat_auto      = sizeof(struct atmel_sdhci_plat),
 136 };
 137 #endif