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