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 #include <linux/errno.h>
  13 #include <mach/pic32.h>
  14
  15 struct pic32_sdhci_plat {
  16         struct mmc_config cfg;
  17         struct mmc mmc;
  18 };
  19
  20 static int pic32_sdhci_probe(struct udevice *dev)
  21 {
  22         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  23         struct pic32_sdhci_plat *plat = dev_get_plat(dev);
  24         struct sdhci_host *host = dev_get_priv(dev);
  25
  26         struct clk clk;
  27         ulong clk_rate;
  28         int ret;
  29
  30         ret = clk_get_by_name(dev, "base_clk", &clk);
  31         if (ret)
  32                 return ret;
  33
  34         clk_rate = clk_get_rate(&clk);
  35         clk_free(&clk);
  36
  37         if (IS_ERR_VALUE(clk_rate))
  38                 return clk_rate;
  39
  40         host->ioaddr = dev_remap_addr(dev);
  41
  42         if (!host->ioaddr)
  43                 return -EINVAL;
  44
  45         host->name      = dev->name;
  46         host->quirks    = SDHCI_QUIRK_NO_HISPD_BIT;
  47         host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
  48         host->max_clk   = clk_rate;
  49
  50         host->mmc = &plat->mmc;
  51         host->mmc->dev = dev;
  52
  53         ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
  54         if (ret)
  55                 return ret;
  56
  57         host->mmc->priv = host;
  58         upriv->mmc = host->mmc;
  59
  60         ret = sdhci_probe(dev);
  61         if (ret)
  62                 return ret;
  63
  64         if (!dev_read_bool(dev, "microchip,use-sdcd")) {
  65                 // Use workaround 1 for erratum #15 by default
  66                 u8 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
  67                 ctrl = (ctrl & ~SDHCI_CTRL_CD_TEST_INS) | SDHCI_CTRL_CD_TEST;
  68                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int pic32_sdhci_bind(struct udevice *dev)
  75 {
  76         struct pic32_sdhci_plat *plat = dev_get_plat(dev);
  77
  78         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  79 }
  80
  81 static const struct udevice_id pic32_sdhci_ids[] = {
  82         { .compatible = "microchip,pic32mzda-sdhci" },
  83         { }
  84 };
  85
  86 U_BOOT_DRIVER(pic32_sdhci_drv) = {
  87         .name                   = "pic32_sdhci",
  88         .id                     = UCLASS_MMC,
  89         .of_match               = pic32_sdhci_ids,
  90         .ops                    = &sdhci_ops,
  91         .bind                   = pic32_sdhci_bind,
  92         .probe                  = pic32_sdhci_probe,
  93         .priv_auto      = sizeof(struct sdhci_host),
  94         .plat_auto      = sizeof(struct pic32_sdhci_plat)
  95 };