drivers/mmc/npcm_sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2022 Nuvoton Technology Corp.
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <sdhci.h>
   9 #include <clk.h>
  10 #include <power/regulator.h>
  11
  12 #define NPCM_SDHC_MIN_FREQ      400000
  13
  14 struct npcm_sdhci_plat {
  15         struct mmc_config cfg;
  16         struct mmc mmc;
  17 };
  18
  19 static int npcm_sdhci_probe(struct udevice *dev)
  20 {
  21         struct npcm_sdhci_plat *plat = dev_get_plat(dev);
  22         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  23         struct sdhci_host *host = dev_get_priv(dev);
  24         struct udevice *vqmmc_supply;
  25         int vqmmc_uv, ret;
  26         struct clk clk;
  27
  28         host->name = dev->name;
  29         host->ioaddr = dev_read_addr_ptr(dev);
  30         host->max_clk = dev_read_u32_default(dev, "clock-frequency", 0);
  31
  32         ret = clk_get_by_index(dev, 0, &clk);
  33         if (!ret && host->max_clk) {
  34                 ret = clk_set_rate(&clk, host->max_clk);
  35                 if (ret < 0)
  36                         return ret;
  37         }
  38
  39         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  40                 device_get_supply_regulator(dev, "vqmmc-supply", &vqmmc_supply);
  41                 vqmmc_uv = dev_read_u32_default(dev, "vqmmc-microvolt", 0);
  42                 /* Set IO voltage */
  43                 if (vqmmc_supply && vqmmc_uv)
  44                         regulator_set_value(vqmmc_supply, vqmmc_uv);
  45         }
  46
  47         host->index = dev_read_u32_default(dev, "index", 0);
  48         ret = mmc_of_parse(dev, &plat->cfg);
  49         if (ret)
  50                 return ret;
  51
  52         host->mmc = &plat->mmc;
  53         host->mmc->priv = host;
  54         host->mmc->dev = dev;
  55         upriv->mmc = host->mmc;
  56
  57         ret = sdhci_setup_cfg(&plat->cfg, host, 0, NPCM_SDHC_MIN_FREQ);
  58         if (ret)
  59                 return ret;
  60
  61         return sdhci_probe(dev);
  62 }
  63
  64 static int npcm_sdhci_bind(struct udevice *dev)
  65 {
  66         struct npcm_sdhci_plat *plat = dev_get_plat(dev);
  67
  68         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  69 }
  70
  71 static const struct udevice_id npcm_mmc_ids[] = {
  72         { .compatible = "nuvoton,npcm750-sdhci" },
  73         { .compatible = "nuvoton,npcm845-sdhci" },
  74         { }
  75 };
  76
  77 U_BOOT_DRIVER(npcm_sdhci_drv) = {
  78         .name           = "npcm_sdhci",
  79         .id             = UCLASS_MMC,
  80         .of_match       = npcm_mmc_ids,
  81         .ops            = &sdhci_ops,
  82         .bind           = npcm_sdhci_bind,
  83         .probe          = npcm_sdhci_probe,
  84         .priv_auto      = sizeof(struct sdhci_host),
  85         .plat_auto      = sizeof(struct npcm_sdhci_plat),
  86 };