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 #ifdef CONFIG_PM_SLEEP
  25
  26 static int sdhci_brcmstb_suspend(struct device *dev)
  27 {
  28         struct sdhci_host *host = dev_get_drvdata(dev);
  29         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  30         int res;
  31
  32         res = sdhci_suspend_host(host);
  33         if (res)
  34                 return res;
  35         clk_disable_unprepare(pltfm_host->clk);
  36         return res;
  37 }
  38
  39 static int sdhci_brcmstb_resume(struct device *dev)
  40 {
  41         struct sdhci_host *host = dev_get_drvdata(dev);
  42         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  43         int err;
  44
  45         err = clk_prepare_enable(pltfm_host->clk);
  46         if (err)
  47                 return err;
  48         return sdhci_resume_host(host);
  49 }
  50
  51 #endif /* CONFIG_PM_SLEEP */
  52
  53 static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend,
  54                         sdhci_brcmstb_resume);
  55
  56 static const struct sdhci_ops sdhci_brcmstb_ops = {
  57         .set_clock = sdhci_set_clock,
  58         .set_bus_width = sdhci_set_bus_width,
  59         .reset = sdhci_reset,
  60         .set_uhs_signaling = sdhci_set_uhs_signaling,
  61 };
  62
  63 static struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
  64         .ops = &sdhci_brcmstb_ops,
  65 };
  66
  67 static int sdhci_brcmstb_probe(struct platform_device *pdev)
  68 {
  69         struct sdhci_host *host;
  70         struct sdhci_pltfm_host *pltfm_host;
  71         struct clk *clk;
  72         int res;
  73
  74         clk = devm_clk_get(&pdev->dev, NULL);
  75         if (IS_ERR(clk)) {
  76                 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
  77                 clk = NULL;
  78         }
  79         res = clk_prepare_enable(clk);
  80         if (res)
  81                 return res;
  82
  83         host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
  84         if (IS_ERR(host)) {
  85                 res = PTR_ERR(host);
  86                 goto err_clk;
  87         }
  88
  89         /* Enable MMC_CAP2_HC_ERASE_SZ for better max discard calculations */
  90         host->mmc->caps2 |= MMC_CAP2_HC_ERASE_SZ;
  91
  92         sdhci_get_of_property(pdev);
  93         mmc_of_parse(host->mmc);
  94
  95         /*
  96          * Supply the existing CAPS, but clear the UHS modes. This
  97          * will allow these modes to be specified by device tree
  98          * properties through mmc_of_parse().
  99          */
 100         host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 101         host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
 102         host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
 103                         SDHCI_SUPPORT_DDR50);
 104         host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
 105                 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 106
 107         res = sdhci_add_host(host);
 108         if (res)
 109                 goto err;
 110
 111         pltfm_host = sdhci_priv(host);
 112         pltfm_host->clk = clk;
 113         return res;
 114
 115 err:
 116         sdhci_pltfm_free(pdev);
 117 err_clk:
 118         clk_disable_unprepare(clk);
 119         return res;
 120 }
 121
 122 static const struct of_device_id sdhci_brcm_of_match[] = {
 123         { .compatible = "brcm,bcm7425-sdhci" },
 124         {},
 125 };
 126 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
 127
 128 static struct platform_driver sdhci_brcmstb_driver = {
 129         .driver         = {
 130                 .name   = "sdhci-brcmstb",
 131                 .owner  = THIS_MODULE,
 132                 .pm     = &sdhci_brcmstb_pmops,
 133                 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
 134         },
 135         .probe          = sdhci_brcmstb_probe,
 136         .remove         = sdhci_pltfm_unregister,
 137 };
 138
 139 module_platform_driver(sdhci_brcmstb_driver);
 140
 141 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
 142 MODULE_AUTHOR("Broadcom");
 143 MODULE_LICENSE("GPL v2");