LXR uboot/drivers/mmc/pic32

   1/*
   2 * Support of SDHCI for Microchip PIC32 SoC.
   3 *
   4 * Copyright (C) 2015 Microchip Technology Inc.
   5 * Andrei Pistirica <andrei.pistirica@microchip.com>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <dm.h>
  12#include <sdhci.h>
  13#include <linux/errno.h>
  14#include <mach/pic32.h>
  15
  16DECLARE_GLOBAL_DATA_PTR;
  17
  18static int pic32_sdhci_get_cd(struct sdhci_host *host)
  19{
  20        /* PIC32 SDHCI CD errata:
  21         * - set CD_TEST and clear CD_TEST_INS bit
  22         */
  23        sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
  24
  25        return 0;
  26}
  27
  28static const struct sdhci_ops pic32_sdhci_ops = {
  29        .get_cd = pic32_sdhci_get_cd,
  30};
  31
  32static int pic32_sdhci_probe(struct udevice *dev)
  33{
  34        struct sdhci_host *host = dev_get_priv(dev);
  35        const void *fdt = gd->fdt_blob;
  36        u32 f_min_max[2];
  37        fdt_addr_t addr;
  38        fdt_size_t size;
  39        int ret;
  40
  41        addr = fdtdec_get_addr_size(fdt, dev_of_offset(dev), "reg", &size);
  42        if (addr == FDT_ADDR_T_NONE)
  43                return -EINVAL;
  44
  45        host->ioaddr    = ioremap(addr, size);
  46        host->name      = dev->name;
  47        host->quirks    = SDHCI_QUIRK_NO_HISPD_BIT;
  48        host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  49                                        "bus-width", 4);
  50        host->ops = &pic32_sdhci_ops;
  51
  52        ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
  53                                   "clock-freq-min-max", f_min_max, 2);
  54        if (ret) {
  55                printf("sdhci: clock-freq-min-max not found\n");
  56                return ret;
  57        }
  58
  59        host->max_clk   = f_min_max[1];
  60
  61        ret = add_sdhci(host, 0, f_min_max[0]);
  62        if (ret)
  63                return ret;
  64        host->mmc->dev = dev;
  65
  66        return 0;
  67}
  68
  69static const struct udevice_id pic32_sdhci_ids[] = {
  70        { .compatible = "microchip,pic32mzda-sdhci" },
  71        { }
  72};
  73
  74U_BOOT_DRIVER(pic32_sdhci_drv) = {
  75        .name                   = "pic32_sdhci",
  76        .id                     = UCLASS_MMC,
  77        .of_match               = pic32_sdhci_ids,
  78        .probe                  = pic32_sdhci_probe,
  79        .priv_auto_alloc_size   = sizeof(struct sdhci_host),
  80};
  81