LXR uboot/drivers/mmc/pic32

   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
  13struct pic32_sdhci_plat {
  14        struct mmc_config cfg;
  15        struct mmc mmc;
  16};
  17
  18static 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_platdata(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
  72static int pic32_sdhci_bind(struct udevice *dev)
  73{
  74        struct pic32_sdhci_plat *plat = dev_get_platdata(dev);
  75
  76        return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  77}
  78
  79static const struct udevice_id pic32_sdhci_ids[] = {
  80        { .compatible = "microchip,pic32mzda-sdhci" },
  81        { }
  82};
  83
  84U_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_alloc_size   = sizeof(struct sdhci_host),
  92        .platdata_auto_alloc_size = sizeof(struct pic32_sdhci_plat)
  93};
  94