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#include <linux/errno.h>
  13#include <mach/pic32.h>
  14
  15struct pic32_sdhci_plat {
  16        struct mmc_config cfg;
  17        struct mmc mmc;
  18};
  19
  20static 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
  74static 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
  81static const struct udevice_id pic32_sdhci_ids[] = {
  82        { .compatible = "microchip,pic32mzda-sdhci" },
  83        { }
  84};
  85
  86U_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};
  96