drivers/mmc/rockchip_sdhci.c

   1 /*
   2  * (C) Copyright 2016 Fuzhou Rockchip Electronics Co., Ltd
   3  *
   4  * Rockchip SD Host Controller Interface
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <fdtdec.h>
  12 #include <libfdt.h>
  13 #include <malloc.h>
  14 #include <sdhci.h>
  15 #include <clk.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18 /* 400KHz is max freq for card ID etc. Use that as min */
  19 #define EMMC_MIN_FREQ   400000
  20
  21 struct rockchip_sdhc_plat {
  22         struct mmc_config cfg;
  23         struct mmc mmc;
  24 };
  25
  26 struct rockchip_sdhc {
  27         struct sdhci_host host;
  28         void *base;
  29 };
  30
  31 static int arasan_sdhci_probe(struct udevice *dev)
  32 {
  33         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  34         struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
  35         struct rockchip_sdhc *prv = dev_get_priv(dev);
  36         struct sdhci_host *host = &prv->host;
  37         int max_frequency, ret;
  38         struct clk clk;
  39
  40
  41         max_frequency = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  42                         "max-frequency", 0);
  43         ret = clk_get_by_index(dev, 0, &clk);
  44         if (!ret) {
  45                 ret = clk_set_rate(&clk, max_frequency);
  46                 if (IS_ERR_VALUE(ret))
  47                         printf("%s clk set rate fail!\n", __func__);
  48         } else {
  49                 printf("%s fail to get clk\n", __func__);
  50         }
  51
  52         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
  53         host->max_clk = max_frequency;
  54
  55         ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
  56
  57         host->mmc = &plat->mmc;
  58         if (ret)
  59                 return ret;
  60         host->mmc->priv = &prv->host;
  61         host->mmc->dev = dev;
  62         upriv->mmc = host->mmc;
  63
  64         return sdhci_probe(dev);
  65 }
  66
  67 static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
  68 {
  69         struct sdhci_host *host = dev_get_priv(dev);
  70
  71         host->name = dev->name;
  72         host->ioaddr = dev_get_addr_ptr(dev);
  73
  74         return 0;
  75 }
  76
  77 static int rockchip_sdhci_bind(struct udevice *dev)
  78 {
  79         struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
  80
  81         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  82 }
  83
  84 static const struct udevice_id arasan_sdhci_ids[] = {
  85         { .compatible = "arasan,sdhci-5.1" },
  86         { }
  87 };
  88
  89 U_BOOT_DRIVER(arasan_sdhci_drv) = {
  90         .name           = "arasan_sdhci",
  91         .id             = UCLASS_MMC,
  92         .of_match       = arasan_sdhci_ids,
  93         .ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
  94         .ops            = &sdhci_ops,
  95         .bind           = rockchip_sdhci_bind,
  96         .probe          = arasan_sdhci_probe,
  97         .priv_auto_alloc_size = sizeof(struct rockchip_sdhc),
  98         .platdata_auto_alloc_size = sizeof(struct rockchip_sdhc_plat),
  99 };