drivers/mfd/tc6387xb.c

   1 /*
   2  * Toshiba TC6387XB support
   3  * Copyright (c) 2005 Ian Molton
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This file contains TC6387XB base support.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/tmio.h>
  19 #include <linux/mfd/tc6387xb.h>
  20
  21 enum {
  22         TC6387XB_CELL_MMC,
  23 };
  24
  25 #ifdef CONFIG_PM
  26 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
  27 {
  28         struct clk *clk32k = platform_get_drvdata(dev);
  29         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
  30
  31         if (pdata && pdata->suspend)
  32                 pdata->suspend(dev);
  33         clk_disable(clk32k);
  34
  35         return 0;
  36 }
  37
  38 static int tc6387xb_resume(struct platform_device *dev)
  39 {
  40         struct clk *clk32k = platform_get_drvdata(dev);
  41         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
  42
  43         clk_enable(clk32k);
  44         if (pdata && pdata->resume)
  45                 pdata->resume(dev);
  46
  47         return 0;
  48 }
  49 #else
  50 #define tc6387xb_suspend  NULL
  51 #define tc6387xb_resume   NULL
  52 #endif
  53
  54 /*--------------------------------------------------------------------------*/
  55
  56 static int tc6387xb_mmc_enable(struct platform_device *mmc)
  57 {
  58         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
  59         struct clk *clk32k = platform_get_drvdata(dev);
  60
  61         clk_enable(clk32k);
  62
  63         return 0;
  64 }
  65
  66 static int tc6387xb_mmc_disable(struct platform_device *mmc)
  67 {
  68         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
  69         struct clk *clk32k = platform_get_drvdata(dev);
  70
  71         clk_disable(clk32k);
  72
  73         return 0;
  74 }
  75
  76 /*--------------------------------------------------------------------------*/
  77
  78 static struct resource tc6387xb_mmc_resources[] = {
  79         {
  80                 .start = 0x800,
  81                 .end   = 0x9ff,
  82                 .flags = IORESOURCE_MEM,
  83         },
  84         {
  85                 .start = 0x200,
  86                 .end   = 0x2ff,
  87                 .flags = IORESOURCE_MEM,
  88         },
  89         {
  90                 .start = 0,
  91                 .end   = 0,
  92                 .flags = IORESOURCE_IRQ,
  93         },
  94 };
  95
  96 static struct mfd_cell tc6387xb_cells[] = {
  97         [TC6387XB_CELL_MMC] = {
  98                 .name = "tmio-mmc",
  99                 .enable = tc6387xb_mmc_enable,
 100                 .disable = tc6387xb_mmc_disable,
 101                 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
 102                 .resources = tc6387xb_mmc_resources,
 103         },
 104 };
 105
 106 static int tc6387xb_probe(struct platform_device *dev)
 107 {
 108         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
 109         struct resource *iomem;
 110         struct clk *clk32k;
 111         int irq, ret;
 112
 113         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 114         if (!iomem) {
 115                 return -EINVAL;
 116         }
 117
 118         ret  = platform_get_irq(dev, 0);
 119         if (ret >= 0)
 120                 irq = ret;
 121         else
 122                 goto err_resource;
 123
 124         clk32k = clk_get(&dev->dev, "CLK_CK32K");
 125         if (IS_ERR(clk32k)) {
 126                 ret = PTR_ERR(clk32k);
 127                 goto err_resource;
 128         }
 129         platform_set_drvdata(dev, clk32k);
 130
 131         if (pdata && pdata->enable)
 132                 pdata->enable(dev);
 133
 134         printk(KERN_INFO "Toshiba tc6387xb initialised\n");
 135
 136         tc6387xb_cells[TC6387XB_CELL_MMC].platform_data =
 137                 &tc6387xb_cells[TC6387XB_CELL_MMC];
 138         tc6387xb_cells[TC6387XB_CELL_MMC].data_size =
 139                 sizeof(tc6387xb_cells[TC6387XB_CELL_MMC]);
 140
 141         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
 142                               ARRAY_SIZE(tc6387xb_cells), iomem, irq);
 143
 144         if (!ret)
 145                 return 0;
 146
 147         clk_put(clk32k);
 148 err_resource:
 149         return ret;
 150 }
 151
 152 static int tc6387xb_remove(struct platform_device *dev)
 153 {
 154         struct clk *clk32k = platform_get_drvdata(dev);
 155
 156         mfd_remove_devices(&dev->dev);
 157         clk_disable(clk32k);
 158         clk_put(clk32k);
 159         platform_set_drvdata(dev, NULL);
 160
 161         return 0;
 162 }
 163
 164
 165 static struct platform_driver tc6387xb_platform_driver = {
 166         .driver = {
 167                 .name           = "tc6387xb",
 168         },
 169         .probe          = tc6387xb_probe,
 170         .remove         = tc6387xb_remove,
 171         .suspend        = tc6387xb_suspend,
 172         .resume         = tc6387xb_resume,
 173 };
 174
 175
 176 static int __init tc6387xb_init(void)
 177 {
 178         return platform_driver_register(&tc6387xb_platform_driver);
 179 }
 180
 181 static void __exit tc6387xb_exit(void)
 182 {
 183         platform_driver_unregister(&tc6387xb_platform_driver);
 184 }
 185
 186 module_init(tc6387xb_init);
 187 module_exit(tc6387xb_exit);
 188
 189 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
 190 MODULE_LICENSE("GPL v2");
 191 MODULE_AUTHOR("Ian Molton");
 192 MODULE_ALIAS("platform:tc6387xb");