drivers/mmc/host/sdhci-sirf.c

   1 /*
   2  * SDHCI support for SiRF primaII and marco SoCs
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/device.h>
  11 #include <linux/mmc/host.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/mmc/slot-gpio.h>
  16 #include "sdhci-pltfm.h"
  17
  18 struct sdhci_sirf_priv {
  19         struct clk *clk;
  20         int gpio_cd;
  21 };
  22
  23 static unsigned int sdhci_sirf_get_max_clk(struct sdhci_host *host)
  24 {
  25         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  26         struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
  27         return clk_get_rate(priv->clk);
  28 }
  29
  30 static struct sdhci_ops sdhci_sirf_ops = {
  31         .set_clock = sdhci_set_clock,
  32         .get_max_clock  = sdhci_sirf_get_max_clk,
  33         .set_bus_width = sdhci_set_bus_width,
  34         .reset = sdhci_reset,
  35         .set_uhs_signaling = sdhci_set_uhs_signaling,
  36 };
  37
  38 static struct sdhci_pltfm_data sdhci_sirf_pdata = {
  39         .ops = &sdhci_sirf_ops,
  40         .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  41                 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
  42                 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
  43                 SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
  44                 SDHCI_QUIRK_DELAY_AFTER_POWER,
  45 };
  46
  47 static int sdhci_sirf_probe(struct platform_device *pdev)
  48 {
  49         struct sdhci_host *host;
  50         struct sdhci_pltfm_host *pltfm_host;
  51         struct sdhci_sirf_priv *priv;
  52         struct clk *clk;
  53         int gpio_cd;
  54         int ret;
  55
  56         clk = devm_clk_get(&pdev->dev, NULL);
  57         if (IS_ERR(clk)) {
  58                 dev_err(&pdev->dev, "unable to get clock");
  59                 return PTR_ERR(clk);
  60         }
  61
  62         if (pdev->dev.of_node)
  63                 gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
  64         else
  65                 gpio_cd = -EINVAL;
  66
  67         host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
  68         if (IS_ERR(host))
  69                 return PTR_ERR(host);
  70
  71         pltfm_host = sdhci_priv(host);
  72         priv = sdhci_pltfm_priv(pltfm_host);
  73         priv->clk = clk;
  74         priv->gpio_cd = gpio_cd;
  75
  76         sdhci_get_of_property(pdev);
  77
  78         ret = clk_prepare_enable(priv->clk);
  79         if (ret)
  80                 goto err_clk_prepare;
  81
  82         ret = sdhci_add_host(host);
  83         if (ret)
  84                 goto err_sdhci_add;
  85
  86         /*
  87          * We must request the IRQ after sdhci_add_host(), as the tasklet only
  88          * gets setup in sdhci_add_host() and we oops.
  89          */
  90         if (gpio_is_valid(priv->gpio_cd)) {
  91                 ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
  92                 if (ret) {
  93                         dev_err(&pdev->dev, "card detect irq request failed: %d\n",
  94                                 ret);
  95                         goto err_request_cd;
  96                 }
  97         }
  98
  99         return 0;
 100
 101 err_request_cd:
 102         sdhci_remove_host(host, 0);
 103 err_sdhci_add:
 104         clk_disable_unprepare(priv->clk);
 105 err_clk_prepare:
 106         sdhci_pltfm_free(pdev);
 107         return ret;
 108 }
 109
 110 static int sdhci_sirf_remove(struct platform_device *pdev)
 111 {
 112         struct sdhci_host *host = platform_get_drvdata(pdev);
 113         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 114         struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
 115
 116         sdhci_pltfm_unregister(pdev);
 117
 118         if (gpio_is_valid(priv->gpio_cd))
 119                 mmc_gpio_free_cd(host->mmc);
 120
 121         clk_disable_unprepare(priv->clk);
 122         return 0;
 123 }
 124
 125 #ifdef CONFIG_PM_SLEEP
 126 static int sdhci_sirf_suspend(struct device *dev)
 127 {
 128         struct sdhci_host *host = dev_get_drvdata(dev);
 129         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 130         struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
 131         int ret;
 132
 133         ret = sdhci_suspend_host(host);
 134         if (ret)
 135                 return ret;
 136
 137         clk_disable(priv->clk);
 138
 139         return 0;
 140 }
 141
 142 static int sdhci_sirf_resume(struct device *dev)
 143 {
 144         struct sdhci_host *host = dev_get_drvdata(dev);
 145         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 146         struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
 147         int ret;
 148
 149         ret = clk_enable(priv->clk);
 150         if (ret) {
 151                 dev_dbg(dev, "Resume: Error enabling clock\n");
 152                 return ret;
 153         }
 154
 155         return sdhci_resume_host(host);
 156 }
 157
 158 static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
 159 #endif
 160
 161 static const struct of_device_id sdhci_sirf_of_match[] = {
 162         { .compatible = "sirf,prima2-sdhc" },
 163         { }
 164 };
 165 MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match);
 166
 167 static struct platform_driver sdhci_sirf_driver = {
 168         .driver         = {
 169                 .name   = "sdhci-sirf",
 170                 .owner  = THIS_MODULE,
 171                 .of_match_table = sdhci_sirf_of_match,
 172 #ifdef CONFIG_PM_SLEEP
 173                 .pm     = &sdhci_sirf_pm_ops,
 174 #endif
 175         },
 176         .probe          = sdhci_sirf_probe,
 177         .remove         = sdhci_sirf_remove,
 178 };
 179
 180 module_platform_driver(sdhci_sirf_driver);
 181
 182 MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco");
 183 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 184 MODULE_LICENSE("GPL v2");