drivers/mfd/sh_mobile_sdhi.c

   1 /*
   2  * SuperH Mobile SDHI
   3  *
   4  * Copyright (C) 2009 Magnus Damm
   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  * Based on "Compaq ASIC3 support":
  11  *
  12  * Copyright 2001 Compaq Computer Corporation.
  13  * Copyright 2004-2005 Phil Blundell
  14  * Copyright 2007-2008 OpenedHand Ltd.
  15  *
  16  * Authors: Phil Blundell <pb@handhelds.org>,
  17  *          Samuel Ortiz <sameo@openedhand.com>
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/clk.h>
  23 #include <linux/slab.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/mmc/host.h>
  26 #include <linux/mfd/core.h>
  27 #include <linux/mfd/tmio.h>
  28 #include <linux/mfd/sh_mobile_sdhi.h>
  29
  30 struct sh_mobile_sdhi {
  31         struct clk *clk;
  32         struct tmio_mmc_data mmc_data;
  33         struct mfd_cell cell_mmc;
  34 };
  35
  36 static struct resource sh_mobile_sdhi_resources[] = {
  37         {
  38                 .start = 0x000,
  39                 .end   = 0x1ff,
  40                 .flags = IORESOURCE_MEM,
  41         },
  42         {
  43                 .start = 0,
  44                 .end   = 0,
  45                 .flags = IORESOURCE_IRQ,
  46         },
  47 };
  48
  49 static struct mfd_cell sh_mobile_sdhi_cell = {
  50         .name          = "tmio-mmc",
  51         .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
  52         .resources     = sh_mobile_sdhi_resources,
  53 };
  54
  55 static void sh_mobile_sdhi_set_pwr(struct platform_device *tmio, int state)
  56 {
  57         struct platform_device *pdev = to_platform_device(tmio->dev.parent);
  58         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  59
  60         if (p && p->set_pwr)
  61                 p->set_pwr(pdev, state);
  62 }
  63
  64 static int __init sh_mobile_sdhi_probe(struct platform_device *pdev)
  65 {
  66         struct sh_mobile_sdhi *priv;
  67         struct resource *mem;
  68         char clk_name[8];
  69         int ret, irq;
  70
  71         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  72         if (!mem)
  73                 dev_err(&pdev->dev, "missing MEM resource\n");
  74
  75         irq = platform_get_irq(pdev, 0);
  76         if (irq < 0)
  77                 dev_err(&pdev->dev, "missing IRQ resource\n");
  78
  79         if (!mem || (irq < 0))
  80                 return -EINVAL;
  81
  82         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
  83         if (priv == NULL) {
  84                 dev_err(&pdev->dev, "kzalloc failed\n");
  85                 return -ENOMEM;
  86         }
  87
  88         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
  89         priv->clk = clk_get(&pdev->dev, clk_name);
  90         if (IS_ERR(priv->clk)) {
  91                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
  92                 ret = PTR_ERR(priv->clk);
  93                 kfree(priv);
  94                 return ret;
  95         }
  96
  97         clk_enable(priv->clk);
  98
  99         priv->mmc_data.hclk = clk_get_rate(priv->clk);
 100         priv->mmc_data.set_pwr = sh_mobile_sdhi_set_pwr;
 101         priv->mmc_data.capabilities = MMC_CAP_MMC_HIGHSPEED;
 102
 103         memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
 104         priv->cell_mmc.driver_data = &priv->mmc_data;
 105         priv->cell_mmc.platform_data = &priv->cell_mmc;
 106         priv->cell_mmc.data_size = sizeof(priv->cell_mmc);
 107
 108         platform_set_drvdata(pdev, priv);
 109
 110         ret = mfd_add_devices(&pdev->dev, pdev->id,
 111                               &priv->cell_mmc, 1, mem, irq);
 112         if (ret) {
 113                 clk_disable(priv->clk);
 114                 clk_put(priv->clk);
 115                 kfree(priv);
 116         }
 117
 118         return ret;
 119 }
 120
 121 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 122 {
 123         struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev);
 124
 125         mfd_remove_devices(&pdev->dev);
 126         clk_disable(priv->clk);
 127         clk_put(priv->clk);
 128         kfree(priv);
 129
 130         return 0;
 131 }
 132
 133 static struct platform_driver sh_mobile_sdhi_driver = {
 134         .driver         = {
 135                 .name   = "sh_mobile_sdhi",
 136                 .owner  = THIS_MODULE,
 137         },
 138         .probe          = sh_mobile_sdhi_probe,
 139         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 140 };
 141
 142 static int __init sh_mobile_sdhi_init(void)
 143 {
 144         return platform_driver_register(&sh_mobile_sdhi_driver);
 145 }
 146
 147 static void __exit sh_mobile_sdhi_exit(void)
 148 {
 149         platform_driver_unregister(&sh_mobile_sdhi_driver);
 150 }
 151
 152 module_init(sh_mobile_sdhi_init);
 153 module_exit(sh_mobile_sdhi_exit);
 154
 155 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 156 MODULE_AUTHOR("Magnus Damm");
 157 MODULE_LICENSE("GPL v2");