drivers/mmc/pic32_sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Support of SDHCI for Microchip PIC32 SoC.
   4  *
   5  * Copyright (C) 2015 Microchip Technology Inc.
   6  * Andrei Pistirica <andrei.pistirica@microchip.com>
   7  */
   8
   9 #include <dm.h>
  10 #include <sdhci.h>
  11 #include <clk.h>
  12
  13 struct pic32_sdhci_plat {
  14         struct mmc_config cfg;
  15         struct mmc mmc;
  16 };
  17
  18 static int pic32_sdhci_probe(struct udevice *dev)
  19 {
  20         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  21         struct pic32_sdhci_plat *plat = dev_get_plat(dev);
  22         struct sdhci_host *host = dev_get_priv(dev);
  23
  24         struct clk clk;
  25         ulong clk_rate;
  26         int ret;
  27
  28         ret = clk_get_by_name(dev, "base_clk", &clk);
  29         if (ret)
  30                 return ret;
  31
  32         clk_rate = clk_get_rate(&clk);
  33         clk_free(&clk);
  34
  35         if (IS_ERR_VALUE(clk_rate))
  36                 return clk_rate;
  37
  38         host->ioaddr = dev_remap_addr(dev);
  39
  40         if (!host->ioaddr)
  41                 return -EINVAL;
  42
  43         host->name      = dev->name;
  44         host->quirks    = SDHCI_QUIRK_NO_HISPD_BIT;
  45         host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
  46         host->max_clk   = clk_rate;
  47
  48         host->mmc = &plat->mmc;
  49         host->mmc->dev = dev;
  50
  51         ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
  52         if (ret)
  53                 return ret;
  54
  55         host->mmc->priv = host;
  56         upriv->mmc = host->mmc;
  57
  58         ret = sdhci_probe(dev);
  59         if (ret)
  60                 return ret;
  61
  62         if (!dev_read_bool(dev, "microchip,use-sdcd")) {
  63                 // Use workaround 1 for erratum #15 by default
  64                 u8 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
  65                 ctrl = (ctrl & ~SDHCI_CTRL_CD_TEST_INS) | SDHCI_CTRL_CD_TEST;
  66                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
  67         }
  68
  69         return 0;
  70 }
  71
  72 static int pic32_sdhci_bind(struct udevice *dev)
  73 {
  74         struct pic32_sdhci_plat *plat = dev_get_plat(dev);
  75
  76         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  77 }
  78
  79 static const struct udevice_id pic32_sdhci_ids[] = {
  80         { .compatible = "microchip,pic32mzda-sdhci" },
  81         { }
  82 };
  83
  84 U_BOOT_DRIVER(pic32_sdhci_drv) = {
  85         .name                   = "pic32_sdhci",
  86         .id                     = UCLASS_MMC,
  87         .of_match               = pic32_sdhci_ids,
  88         .ops                    = &sdhci_ops,
  89         .bind                   = pic32_sdhci_bind,
  90         .probe                  = pic32_sdhci_probe,
  91         .priv_auto      = sizeof(struct sdhci_host),
  92         .plat_auto      = sizeof(struct pic32_sdhci_plat)
  93 };