drivers/mmc/host/sdhci-brcmstb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
   4  *
   5  * Copyright (C) 2015 Broadcom Corporation
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/mmc/host.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12
  13 #include "sdhci-pltfm.h"
  14
  15 static const struct sdhci_ops sdhci_brcmstb_ops = {
  16         .set_clock = sdhci_set_clock,
  17         .set_bus_width = sdhci_set_bus_width,
  18         .reset = sdhci_reset,
  19         .set_uhs_signaling = sdhci_set_uhs_signaling,
  20 };
  21
  22 static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
  23         .ops = &sdhci_brcmstb_ops,
  24 };
  25
  26 static int sdhci_brcmstb_probe(struct platform_device *pdev)
  27 {
  28         struct sdhci_host *host;
  29         struct sdhci_pltfm_host *pltfm_host;
  30         struct clk *clk;
  31         int res;
  32
  33         clk = devm_clk_get(&pdev->dev, NULL);
  34         if (IS_ERR(clk)) {
  35                 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
  36                 clk = NULL;
  37         }
  38         res = clk_prepare_enable(clk);
  39         if (res)
  40                 return res;
  41
  42         host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
  43         if (IS_ERR(host)) {
  44                 res = PTR_ERR(host);
  45                 goto err_clk;
  46         }
  47
  48         sdhci_get_of_property(pdev);
  49         res = mmc_of_parse(host->mmc);
  50         if (res)
  51                 goto err;
  52
  53         /*
  54          * Supply the existing CAPS, but clear the UHS modes. This
  55          * will allow these modes to be specified by device tree
  56          * properties through mmc_of_parse().
  57          */
  58         host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
  59         if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
  60                 host->caps &= ~SDHCI_CAN_64BIT;
  61         host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
  62         host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
  63                         SDHCI_SUPPORT_DDR50);
  64         host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
  65                 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  66
  67         res = sdhci_add_host(host);
  68         if (res)
  69                 goto err;
  70
  71         pltfm_host = sdhci_priv(host);
  72         pltfm_host->clk = clk;
  73         return res;
  74
  75 err:
  76         sdhci_pltfm_free(pdev);
  77 err_clk:
  78         clk_disable_unprepare(clk);
  79         return res;
  80 }
  81
  82 static const struct of_device_id sdhci_brcm_of_match[] = {
  83         { .compatible = "brcm,bcm7425-sdhci" },
  84         { .compatible = "brcm,bcm7445-sdhci" },
  85         {},
  86 };
  87 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
  88
  89 static struct platform_driver sdhci_brcmstb_driver = {
  90         .driver         = {
  91                 .name   = "sdhci-brcmstb",
  92                 .pm     = &sdhci_pltfm_pmops,
  93                 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
  94         },
  95         .probe          = sdhci_brcmstb_probe,
  96         .remove         = sdhci_pltfm_unregister,
  97 };
  98
  99 module_platform_driver(sdhci_brcmstb_driver);
 100
 101 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
 102 MODULE_AUTHOR("Broadcom");
 103 MODULE_LICENSE("GPL v2");