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