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 struct tc6387xb {
  26         void __iomem *scr;
  27         struct clk *clk32k;
  28         struct resource rscr;
  29 };
  30
  31 static struct resource tc6387xb_mmc_resources[];
  32
  33 /*--------------------------------------------------------------------------*/
  34
  35 #ifdef CONFIG_PM
  36 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
  37 {
  38         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  39         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
  40
  41         if (pdata && pdata->suspend)
  42                 pdata->suspend(dev);
  43         clk_disable(tc6387xb->clk32k);
  44
  45         return 0;
  46 }
  47
  48 static int tc6387xb_resume(struct platform_device *dev)
  49 {
  50         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  51         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
  52
  53         clk_enable(tc6387xb->clk32k);
  54         if (pdata && pdata->resume)
  55                 pdata->resume(dev);
  56
  57         tmio_core_mmc_resume(tc6387xb->scr + 0x200,
  58                 tc6387xb_mmc_resources[0].start & 0xfffe);
  59
  60         return 0;
  61 }
  62 #else
  63 #define tc6387xb_suspend  NULL
  64 #define tc6387xb_resume   NULL
  65 #endif
  66
  67 /*--------------------------------------------------------------------------*/
  68
  69 static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
  70 {
  71         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  72         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  73
  74         tmio_core_mmc_pwr(tc6387xb->scr + 0x200, state);
  75 }
  76
  77 static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
  78 {
  79         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  80         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  81
  82         tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, state);
  83 }
  84
  85
  86 static int tc6387xb_mmc_enable(struct platform_device *mmc)
  87 {
  88         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
  89         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  90
  91         clk_enable(tc6387xb->clk32k);
  92
  93         tmio_core_mmc_enable(tc6387xb->scr + 0x200,
  94                 tc6387xb_mmc_resources[0].start & 0xfffe);
  95
  96         return 0;
  97 }
  98
  99 static int tc6387xb_mmc_disable(struct platform_device *mmc)
 100 {
 101         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
 102         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
 103
 104         clk_disable(tc6387xb->clk32k);
 105
 106         return 0;
 107 }
 108
 109 static struct tmio_mmc_data tc6387xb_mmc_data = {
 110         .hclk = 24000000,
 111         .set_pwr = tc6387xb_mmc_pwr,
 112         .set_no_clk_div = tc6387xb_mmc_clk_div,
 113 };
 114
 115 /*--------------------------------------------------------------------------*/
 116
 117 static struct resource tc6387xb_mmc_resources[] = {
 118         {
 119                 .start = 0x800,
 120                 .end   = 0x9ff,
 121                 .flags = IORESOURCE_MEM,
 122         },
 123         {
 124                 .start = 0,
 125                 .end   = 0,
 126                 .flags = IORESOURCE_IRQ,
 127         },
 128 };
 129
 130 static struct mfd_cell tc6387xb_cells[] = {
 131         [TC6387XB_CELL_MMC] = {
 132                 .name = "tmio-mmc",
 133                 .enable = tc6387xb_mmc_enable,
 134                 .disable = tc6387xb_mmc_disable,
 135                 .driver_data = &tc6387xb_mmc_data,
 136                 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
 137                 .resources = tc6387xb_mmc_resources,
 138         },
 139 };
 140
 141 static int tc6387xb_probe(struct platform_device *dev)
 142 {
 143         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
 144         struct resource *iomem, *rscr;
 145         struct clk *clk32k;
 146         struct tc6387xb *tc6387xb;
 147         int irq, ret;
 148
 149         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 150         if (!iomem) {
 151                 return -EINVAL;
 152         }
 153
 154         tc6387xb = kzalloc(sizeof *tc6387xb, GFP_KERNEL);
 155         if (!tc6387xb)
 156                 return -ENOMEM;
 157
 158         ret  = platform_get_irq(dev, 0);
 159         if (ret >= 0)
 160                 irq = ret;
 161         else
 162                 goto err_no_irq;
 163
 164         clk32k = clk_get(&dev->dev, "CLK_CK32K");
 165         if (IS_ERR(clk32k)) {
 166                 ret = PTR_ERR(clk32k);
 167                 goto err_no_clk;
 168         }
 169
 170         rscr = &tc6387xb->rscr;
 171         rscr->name = "tc6387xb-core";
 172         rscr->start = iomem->start;
 173         rscr->end = iomem->start + 0xff;
 174         rscr->flags = IORESOURCE_MEM;
 175
 176         ret = request_resource(iomem, rscr);
 177         if (ret)
 178                 goto err_resource;
 179
 180         tc6387xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 181         if (!tc6387xb->scr) {
 182                 ret = -ENOMEM;
 183                 goto err_ioremap;
 184         }
 185
 186         tc6387xb->clk32k = clk32k;
 187         platform_set_drvdata(dev, tc6387xb);
 188
 189         if (pdata && pdata->enable)
 190                 pdata->enable(dev);
 191
 192         printk(KERN_INFO "Toshiba tc6387xb initialised\n");
 193
 194         tc6387xb_cells[TC6387XB_CELL_MMC].platform_data =
 195                 &tc6387xb_cells[TC6387XB_CELL_MMC];
 196         tc6387xb_cells[TC6387XB_CELL_MMC].data_size =
 197                 sizeof(tc6387xb_cells[TC6387XB_CELL_MMC]);
 198
 199         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
 200                               ARRAY_SIZE(tc6387xb_cells), iomem, irq);
 201
 202         if (!ret)
 203                 return 0;
 204
 205 err_ioremap:
 206         release_resource(&tc6387xb->rscr);
 207 err_resource:
 208         clk_put(clk32k);
 209 err_no_clk:
 210 err_no_irq:
 211         kfree(tc6387xb);
 212         return ret;
 213 }
 214
 215 static int tc6387xb_remove(struct platform_device *dev)
 216 {
 217         struct clk *clk32k = platform_get_drvdata(dev);
 218
 219         mfd_remove_devices(&dev->dev);
 220         clk_disable(clk32k);
 221         clk_put(clk32k);
 222         platform_set_drvdata(dev, NULL);
 223
 224         return 0;
 225 }
 226
 227
 228 static struct platform_driver tc6387xb_platform_driver = {
 229         .driver = {
 230                 .name           = "tc6387xb",
 231         },
 232         .probe          = tc6387xb_probe,
 233         .remove         = tc6387xb_remove,
 234         .suspend        = tc6387xb_suspend,
 235         .resume         = tc6387xb_resume,
 236 };
 237
 238
 239 static int __init tc6387xb_init(void)
 240 {
 241         return platform_driver_register(&tc6387xb_platform_driver);
 242 }
 243
 244 static void __exit tc6387xb_exit(void)
 245 {
 246         platform_driver_unregister(&tc6387xb_platform_driver);
 247 }
 248
 249 module_init(tc6387xb_init);
 250 module_exit(tc6387xb_exit);
 251
 252 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
 253 MODULE_LICENSE("GPL v2");
 254 MODULE_AUTHOR("Ian Molton");
 255 MODULE_ALIAS("platform:tc6387xb");
 256