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 const static struct tmio_mmc_data tc6387xb_mmc_data = {
  79         .hclk = 24000000,
  80 };
  81
  82 static struct resource tc6387xb_mmc_resources[] = {
  83         {
  84                 .start = 0x800,
  85                 .end   = 0x9ff,
  86                 .flags = IORESOURCE_MEM,
  87         },
  88         {
  89                 .start = 0x200,
  90                 .end   = 0x2ff,
  91                 .flags = IORESOURCE_MEM,
  92         },
  93         {
  94                 .start = 0,
  95                 .end   = 0,
  96                 .flags = IORESOURCE_IRQ,
  97         },
  98 };
  99
 100 static struct mfd_cell tc6387xb_cells[] = {
 101         [TC6387XB_CELL_MMC] = {
 102                 .name = "tmio-mmc",
 103                 .enable = tc6387xb_mmc_enable,
 104                 .disable = tc6387xb_mmc_disable,
 105                 .driver_data = &tc6387xb_mmc_data,
 106                 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
 107                 .resources = tc6387xb_mmc_resources,
 108         },
 109 };
 110
 111 static int tc6387xb_probe(struct platform_device *dev)
 112 {
 113         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
 114         struct resource *iomem;
 115         struct clk *clk32k;
 116         int irq, ret;
 117
 118         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 119         if (!iomem) {
 120                 return -EINVAL;
 121         }
 122
 123         ret  = platform_get_irq(dev, 0);
 124         if (ret >= 0)
 125                 irq = ret;
 126         else
 127                 goto err_resource;
 128
 129         clk32k = clk_get(&dev->dev, "CLK_CK32K");
 130         if (IS_ERR(clk32k)) {
 131                 ret = PTR_ERR(clk32k);
 132                 goto err_resource;
 133         }
 134         platform_set_drvdata(dev, clk32k);
 135
 136         if (pdata && pdata->enable)
 137                 pdata->enable(dev);
 138
 139         printk(KERN_INFO "Toshiba tc6387xb initialised\n");
 140
 141         tc6387xb_cells[TC6387XB_CELL_MMC].platform_data =
 142                 &tc6387xb_cells[TC6387XB_CELL_MMC];
 143         tc6387xb_cells[TC6387XB_CELL_MMC].data_size =
 144                 sizeof(tc6387xb_cells[TC6387XB_CELL_MMC]);
 145
 146         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
 147                               ARRAY_SIZE(tc6387xb_cells), iomem, irq);
 148
 149         if (!ret)
 150                 return 0;
 151
 152         clk_put(clk32k);
 153 err_resource:
 154         return ret;
 155 }
 156
 157 static int tc6387xb_remove(struct platform_device *dev)
 158 {
 159         struct clk *clk32k = platform_get_drvdata(dev);
 160
 161         mfd_remove_devices(&dev->dev);
 162         clk_disable(clk32k);
 163         clk_put(clk32k);
 164         platform_set_drvdata(dev, NULL);
 165
 166         return 0;
 167 }
 168
 169
 170 static struct platform_driver tc6387xb_platform_driver = {
 171         .driver = {
 172                 .name           = "tc6387xb",
 173         },
 174         .probe          = tc6387xb_probe,
 175         .remove         = tc6387xb_remove,
 176         .suspend        = tc6387xb_suspend,
 177         .resume         = tc6387xb_resume,
 178 };
 179
 180
 181 static int __init tc6387xb_init(void)
 182 {
 183         return platform_driver_register(&tc6387xb_platform_driver);
 184 }
 185
 186 static void __exit tc6387xb_exit(void)
 187 {
 188         platform_driver_unregister(&tc6387xb_platform_driver);
 189 }
 190
 191 module_init(tc6387xb_init);
 192 module_exit(tc6387xb_exit);
 193
 194 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
 195 MODULE_LICENSE("GPL v2");
 196 MODULE_AUTHOR("Ian Molton");
 197 MODULE_ALIAS("platform:tc6387xb");