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