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