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         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
  33                 mmc_retune_needed(host->mmc);
  34
  35         res = sdhci_suspend_host(host);
  36         if (res)
  37                 return res;
  38         clk_disable_unprepare(pltfm_host->clk);
  39         return res;
  40 }
  41
  42 static int sdhci_brcmstb_resume(struct device *dev)
  43 {
  44         struct sdhci_host *host = dev_get_drvdata(dev);
  45         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  46         int err;
  47
  48         err = clk_prepare_enable(pltfm_host->clk);
  49         if (err)
  50                 return err;
  51         return sdhci_resume_host(host);
  52 }
  53
  54 #endif /* CONFIG_PM_SLEEP */
  55
  56 static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend,
  57                         sdhci_brcmstb_resume);
  58
  59 static const struct sdhci_ops sdhci_brcmstb_ops = {
  60         .set_clock = sdhci_set_clock,
  61         .set_bus_width = sdhci_set_bus_width,
  62         .reset = sdhci_reset,
  63         .set_uhs_signaling = sdhci_set_uhs_signaling,
  64 };
  65
  66 static struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
  67         .ops = &sdhci_brcmstb_ops,
  68 };
  69
  70 static int sdhci_brcmstb_probe(struct platform_device *pdev)
  71 {
  72         struct sdhci_host *host;
  73         struct sdhci_pltfm_host *pltfm_host;
  74         struct clk *clk;
  75         int res;
  76
  77         clk = devm_clk_get(&pdev->dev, NULL);
  78         if (IS_ERR(clk)) {
  79                 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
  80                 clk = NULL;
  81         }
  82         res = clk_prepare_enable(clk);
  83         if (res)
  84                 return res;
  85
  86         host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
  87         if (IS_ERR(host)) {
  88                 res = PTR_ERR(host);
  89                 goto err_clk;
  90         }
  91
  92         /* Enable MMC_CAP2_HC_ERASE_SZ for better max discard calculations */
  93         host->mmc->caps2 |= MMC_CAP2_HC_ERASE_SZ;
  94
  95         sdhci_get_of_property(pdev);
  96         mmc_of_parse(host->mmc);
  97
  98         /*
  99          * Supply the existing CAPS, but clear the UHS modes. This
 100          * will allow these modes to be specified by device tree
 101          * properties through mmc_of_parse().
 102          */
 103         host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 104         if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
 105                 host->caps &= ~SDHCI_CAN_64BIT;
 106         host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
 107         host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
 108                         SDHCI_SUPPORT_DDR50);
 109         host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
 110                 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 111
 112         res = sdhci_add_host(host);
 113         if (res)
 114                 goto err;
 115
 116         pltfm_host = sdhci_priv(host);
 117         pltfm_host->clk = clk;
 118         return res;
 119
 120 err:
 121         sdhci_pltfm_free(pdev);
 122 err_clk:
 123         clk_disable_unprepare(clk);
 124         return res;
 125 }
 126
 127 static const struct of_device_id sdhci_brcm_of_match[] = {
 128         { .compatible = "brcm,bcm7425-sdhci" },
 129         { .compatible = "brcm,bcm7445-sdhci" },
 130         {},
 131 };
 132 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
 133
 134 static struct platform_driver sdhci_brcmstb_driver = {
 135         .driver         = {
 136                 .name   = "sdhci-brcmstb",
 137                 .pm     = &sdhci_brcmstb_pmops,
 138                 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
 139         },
 140         .probe          = sdhci_brcmstb_probe,
 141         .remove         = sdhci_pltfm_unregister,
 142 };
 143
 144 module_platform_driver(sdhci_brcmstb_driver);
 145
 146 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
 147 MODULE_AUTHOR("Broadcom");
 148 MODULE_LICENSE("GPL v2");