drivers/mmc/host/sdhci-brcmstb.c

   1 /*
   2  * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
   3  *
   4  * Copyright (C) 2015 Broadcom Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/io.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21
  22 #include "sdhci-pltfm.h"
  23
  24 static const struct sdhci_ops sdhci_brcmstb_ops = {
  25         .set_clock = sdhci_set_clock,
  26         .set_bus_width = sdhci_set_bus_width,
  27         .reset = sdhci_reset,
  28         .set_uhs_signaling = sdhci_set_uhs_signaling,
  29 };
  30
  31 static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
  32         .ops = &sdhci_brcmstb_ops,
  33 };
  34
  35 static int sdhci_brcmstb_probe(struct platform_device *pdev)
  36 {
  37         struct sdhci_host *host;
  38         struct sdhci_pltfm_host *pltfm_host;
  39         struct clk *clk;
  40         int res;
  41
  42         clk = devm_clk_get(&pdev->dev, NULL);
  43         if (IS_ERR(clk)) {
  44                 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
  45                 clk = NULL;
  46         }
  47         res = clk_prepare_enable(clk);
  48         if (res)
  49                 return res;
  50
  51         host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
  52         if (IS_ERR(host)) {
  53                 res = PTR_ERR(host);
  54                 goto err_clk;
  55         }
  56
  57         sdhci_get_of_property(pdev);
  58         res = mmc_of_parse(host->mmc);
  59         if (res)
  60                 goto err;
  61
  62         /*
  63          * Supply the existing CAPS, but clear the UHS modes. This
  64          * will allow these modes to be specified by device tree
  65          * properties through mmc_of_parse().
  66          */
  67         host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
  68         if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
  69                 host->caps &= ~SDHCI_CAN_64BIT;
  70         host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
  71         host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
  72                         SDHCI_SUPPORT_DDR50);
  73         host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
  74                 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  75
  76         res = sdhci_add_host(host);
  77         if (res)
  78                 goto err;
  79
  80         pltfm_host = sdhci_priv(host);
  81         pltfm_host->clk = clk;
  82         return res;
  83
  84 err:
  85         sdhci_pltfm_free(pdev);
  86 err_clk:
  87         clk_disable_unprepare(clk);
  88         return res;
  89 }
  90
  91 static const struct of_device_id sdhci_brcm_of_match[] = {
  92         { .compatible = "brcm,bcm7425-sdhci" },
  93         { .compatible = "brcm,bcm7445-sdhci" },
  94         {},
  95 };
  96 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
  97
  98 static struct platform_driver sdhci_brcmstb_driver = {
  99         .driver         = {
 100                 .name   = "sdhci-brcmstb",
 101                 .pm     = &sdhci_pltfm_pmops,
 102                 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
 103         },
 104         .probe          = sdhci_brcmstb_probe,
 105         .remove         = sdhci_pltfm_unregister,
 106 };
 107
 108 module_platform_driver(sdhci_brcmstb_driver);
 109
 110 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
 111 MODULE_AUTHOR("Broadcom");
 112 MODULE_LICENSE("GPL v2");