drivers/mmc/npcm_sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2022 Nuvoton Technology Corp.
   4  */
   5
   6 #include <dm.h>
   7 #include <sdhci.h>
   8 #include <clk.h>
   9 #include <power/regulator.h>
  10
  11 #define NPCM_SDHC_MIN_FREQ      400000
  12
  13 struct npcm_sdhci_plat {
  14         struct mmc_config cfg;
  15         struct mmc mmc;
  16 };
  17
  18 static int npcm_sdhci_probe(struct udevice *dev)
  19 {
  20         struct npcm_sdhci_plat *plat = dev_get_plat(dev);
  21         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  22         struct sdhci_host *host = dev_get_priv(dev);
  23         struct udevice *vqmmc_supply;
  24         int vqmmc_uv, ret;
  25         struct clk clk;
  26
  27         host->name = dev->name;
  28         host->ioaddr = dev_read_addr_ptr(dev);
  29         host->max_clk = dev_read_u32_default(dev, "clock-frequency", 0);
  30
  31         ret = clk_get_by_index(dev, 0, &clk);
  32         if (!ret && host->max_clk) {
  33                 ret = clk_set_rate(&clk, host->max_clk);
  34                 if (ret < 0)
  35                         return ret;
  36         }
  37
  38         if (CONFIG_IS_ENABLED(DM_REGULATOR)) {
  39                 device_get_supply_regulator(dev, "vqmmc-supply", &vqmmc_supply);
  40                 vqmmc_uv = dev_read_u32_default(dev, "vqmmc-microvolt", 0);
  41                 /* Set IO voltage */
  42                 if (vqmmc_supply && vqmmc_uv)
  43                         regulator_set_value(vqmmc_supply, vqmmc_uv);
  44         }
  45
  46         host->index = dev_read_u32_default(dev, "index", 0);
  47         ret = mmc_of_parse(dev, &plat->cfg);
  48         if (ret)
  49                 return ret;
  50
  51         host->mmc = &plat->mmc;
  52         host->mmc->priv = host;
  53         host->mmc->dev = dev;
  54         upriv->mmc = host->mmc;
  55
  56         ret = sdhci_setup_cfg(&plat->cfg, host, 0, NPCM_SDHC_MIN_FREQ);
  57         if (ret)
  58                 return ret;
  59
  60         return sdhci_probe(dev);
  61 }
  62
  63 static int npcm_sdhci_bind(struct udevice *dev)
  64 {
  65         struct npcm_sdhci_plat *plat = dev_get_plat(dev);
  66
  67         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  68 }
  69
  70 static const struct udevice_id npcm_mmc_ids[] = {
  71         { .compatible = "nuvoton,npcm750-sdhci" },
  72         { .compatible = "nuvoton,npcm845-sdhci" },
  73         { }
  74 };
  75
  76 U_BOOT_DRIVER(npcm_sdhci_drv) = {
  77         .name           = "npcm_sdhci",
  78         .id             = UCLASS_MMC,
  79         .of_match       = npcm_mmc_ids,
  80         .ops            = &sdhci_ops,
  81         .bind           = npcm_sdhci_bind,
  82         .probe          = npcm_sdhci_probe,
  83         .priv_auto      = sizeof(struct sdhci_host),
  84         .plat_auto      = sizeof(struct npcm_sdhci_plat),
  85 };