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 #include <linux/slab.h>
  21
  22 enum {
  23         TC6387XB_CELL_MMC,
  24 };
  25
  26 struct tc6387xb {
  27         void __iomem *scr;
  28         struct clk *clk32k;
  29         struct resource rscr;
  30 };
  31
  32 static struct resource tc6387xb_mmc_resources[] = {
  33         {
  34                 .start = 0x800,
  35                 .end   = 0x9ff,
  36                 .flags = IORESOURCE_MEM,
  37         },
  38         {
  39                 .start = 0,
  40                 .end   = 0,
  41                 .flags = IORESOURCE_IRQ,
  42         },
  43 };
  44
  45 /*--------------------------------------------------------------------------*/
  46
  47 #ifdef CONFIG_PM
  48 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
  49 {
  50         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  51         struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
  52
  53         if (pdata && pdata->suspend)
  54                 pdata->suspend(dev);
  55         clk_disable_unprepare(tc6387xb->clk32k);
  56
  57         return 0;
  58 }
  59
  60 static int tc6387xb_resume(struct platform_device *dev)
  61 {
  62         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  63         struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
  64
  65         clk_prepare_enable(tc6387xb->clk32k);
  66         if (pdata && pdata->resume)
  67                 pdata->resume(dev);
  68
  69         tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0,
  70                 tc6387xb_mmc_resources[0].start & 0xfffe);
  71
  72         return 0;
  73 }
  74 #else
  75 #define tc6387xb_suspend  NULL
  76 #define tc6387xb_resume   NULL
  77 #endif
  78
  79 /*--------------------------------------------------------------------------*/
  80
  81 static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
  82 {
  83         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  84         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  85
  86         tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state);
  87 }
  88
  89 static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
  90 {
  91         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  92         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  93
  94         tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
  95 }
  96
  97
  98 static int tc6387xb_mmc_enable(struct platform_device *mmc)
  99 {
 100         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
 101         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
 102
 103         clk_prepare_enable(tc6387xb->clk32k);
 104
 105         tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
 106                 tc6387xb_mmc_resources[0].start & 0xfffe);
 107
 108         return 0;
 109 }
 110
 111 static int tc6387xb_mmc_disable(struct platform_device *mmc)
 112 {
 113         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
 114         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
 115
 116         clk_disable_unprepare(tc6387xb->clk32k);
 117
 118         return 0;
 119 }
 120
 121 static struct tmio_mmc_data tc6387xb_mmc_data = {
 122         .hclk = 24000000,
 123         .set_pwr = tc6387xb_mmc_pwr,
 124         .set_clk_div = tc6387xb_mmc_clk_div,
 125 };
 126
 127 /*--------------------------------------------------------------------------*/
 128
 129 static const struct mfd_cell tc6387xb_cells[] = {
 130         [TC6387XB_CELL_MMC] = {
 131                 .name = "tmio-mmc",
 132                 .enable = tc6387xb_mmc_enable,
 133                 .disable = tc6387xb_mmc_disable,
 134                 .platform_data = &tc6387xb_mmc_data,
 135                 .pdata_size    = sizeof(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_get_platdata(&dev->dev);
 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         tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL);
 154         if (!tc6387xb)
 155                 return -ENOMEM;
 156
 157         ret  = platform_get_irq(dev, 0);
 158         if (ret >= 0)
 159                 irq = ret;
 160         else
 161                 goto err_no_irq;
 162
 163         clk32k = clk_get(&dev->dev, "CLK_CK32K");
 164         if (IS_ERR(clk32k)) {
 165                 ret = PTR_ERR(clk32k);
 166                 goto err_no_clk;
 167         }
 168
 169         rscr = &tc6387xb->rscr;
 170         rscr->name = "tc6387xb-core";
 171         rscr->start = iomem->start;
 172         rscr->end = iomem->start + 0xff;
 173         rscr->flags = IORESOURCE_MEM;
 174
 175         ret = request_resource(iomem, rscr);
 176         if (ret)
 177                 goto err_resource;
 178
 179         tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
 180         if (!tc6387xb->scr) {
 181                 ret = -ENOMEM;
 182                 goto err_ioremap;
 183         }
 184
 185         tc6387xb->clk32k = clk32k;
 186         platform_set_drvdata(dev, tc6387xb);
 187
 188         if (pdata && pdata->enable)
 189                 pdata->enable(dev);
 190
 191         dev_info(&dev->dev, "Toshiba tc6387xb initialised\n");
 192
 193         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
 194                               ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);
 195
 196         if (!ret)
 197                 return 0;
 198
 199         iounmap(tc6387xb->scr);
 200 err_ioremap:
 201         release_resource(&tc6387xb->rscr);
 202 err_resource:
 203         clk_put(clk32k);
 204 err_no_clk:
 205 err_no_irq:
 206         kfree(tc6387xb);
 207         return ret;
 208 }
 209
 210 static int tc6387xb_remove(struct platform_device *dev)
 211 {
 212         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
 213
 214         mfd_remove_devices(&dev->dev);
 215         iounmap(tc6387xb->scr);
 216         release_resource(&tc6387xb->rscr);
 217         clk_disable_unprepare(tc6387xb->clk32k);
 218         clk_put(tc6387xb->clk32k);
 219         kfree(tc6387xb);
 220
 221         return 0;
 222 }
 223
 224
 225 static struct platform_driver tc6387xb_platform_driver = {
 226         .driver = {
 227                 .name           = "tc6387xb",
 228         },
 229         .probe          = tc6387xb_probe,
 230         .remove         = tc6387xb_remove,
 231         .suspend        = tc6387xb_suspend,
 232         .resume         = tc6387xb_resume,
 233 };
 234
 235 module_platform_driver(tc6387xb_platform_driver);
 236
 237 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
 238 MODULE_LICENSE("GPL v2");
 239 MODULE_AUTHOR("Ian Molton");
 240 MODULE_ALIAS("platform:tc6387xb");
 241