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 tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  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 tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  91
  92         tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
  93 }
  94
  95
  96 static int tc6387xb_mmc_enable(struct platform_device *mmc)
  97 {
  98         struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  99
 100         clk_prepare_enable(tc6387xb->clk32k);
 101
 102         tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
 103                 tc6387xb_mmc_resources[0].start & 0xfffe);
 104
 105         return 0;
 106 }
 107
 108 static int tc6387xb_mmc_disable(struct platform_device *mmc)
 109 {
 110         struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
 111
 112         clk_disable_unprepare(tc6387xb->clk32k);
 113
 114         return 0;
 115 }
 116
 117 static struct tmio_mmc_data tc6387xb_mmc_data = {
 118         .hclk = 24000000,
 119         .set_pwr = tc6387xb_mmc_pwr,
 120         .set_clk_div = tc6387xb_mmc_clk_div,
 121 };
 122
 123 /*--------------------------------------------------------------------------*/
 124
 125 static const struct mfd_cell tc6387xb_cells[] = {
 126         [TC6387XB_CELL_MMC] = {
 127                 .name = "tmio-mmc",
 128                 .enable = tc6387xb_mmc_enable,
 129                 .disable = tc6387xb_mmc_disable,
 130                 .platform_data = &tc6387xb_mmc_data,
 131                 .pdata_size    = sizeof(tc6387xb_mmc_data),
 132                 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
 133                 .resources = tc6387xb_mmc_resources,
 134         },
 135 };
 136
 137 static int tc6387xb_probe(struct platform_device *dev)
 138 {
 139         struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 140         struct resource *iomem, *rscr;
 141         struct clk *clk32k;
 142         struct tc6387xb *tc6387xb;
 143         int irq, ret;
 144
 145         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 146         if (!iomem)
 147                 return -EINVAL;
 148
 149         tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL);
 150         if (!tc6387xb)
 151                 return -ENOMEM;
 152
 153         ret  = platform_get_irq(dev, 0);
 154         if (ret >= 0)
 155                 irq = ret;
 156         else
 157                 goto err_no_irq;
 158
 159         clk32k = clk_get(&dev->dev, "CLK_CK32K");
 160         if (IS_ERR(clk32k)) {
 161                 ret = PTR_ERR(clk32k);
 162                 goto err_no_clk;
 163         }
 164
 165         rscr = &tc6387xb->rscr;
 166         rscr->name = "tc6387xb-core";
 167         rscr->start = iomem->start;
 168         rscr->end = iomem->start + 0xff;
 169         rscr->flags = IORESOURCE_MEM;
 170
 171         ret = request_resource(iomem, rscr);
 172         if (ret)
 173                 goto err_resource;
 174
 175         tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
 176         if (!tc6387xb->scr) {
 177                 ret = -ENOMEM;
 178                 goto err_ioremap;
 179         }
 180
 181         tc6387xb->clk32k = clk32k;
 182         platform_set_drvdata(dev, tc6387xb);
 183
 184         if (pdata && pdata->enable)
 185                 pdata->enable(dev);
 186
 187         dev_info(&dev->dev, "Toshiba tc6387xb initialised\n");
 188
 189         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
 190                               ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);
 191
 192         if (!ret)
 193                 return 0;
 194
 195         iounmap(tc6387xb->scr);
 196 err_ioremap:
 197         release_resource(&tc6387xb->rscr);
 198 err_resource:
 199         clk_put(clk32k);
 200 err_no_clk:
 201 err_no_irq:
 202         kfree(tc6387xb);
 203         return ret;
 204 }
 205
 206 static int tc6387xb_remove(struct platform_device *dev)
 207 {
 208         struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
 209
 210         mfd_remove_devices(&dev->dev);
 211         iounmap(tc6387xb->scr);
 212         release_resource(&tc6387xb->rscr);
 213         clk_disable_unprepare(tc6387xb->clk32k);
 214         clk_put(tc6387xb->clk32k);
 215         kfree(tc6387xb);
 216
 217         return 0;
 218 }
 219
 220
 221 static struct platform_driver tc6387xb_platform_driver = {
 222         .driver = {
 223                 .name           = "tc6387xb",
 224         },
 225         .probe          = tc6387xb_probe,
 226         .remove         = tc6387xb_remove,
 227         .suspend        = tc6387xb_suspend,
 228         .resume         = tc6387xb_resume,
 229 };
 230
 231 module_platform_driver(tc6387xb_platform_driver);
 232
 233 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
 234 MODULE_LICENSE("GPL v2");
 235 MODULE_AUTHOR("Ian Molton");
 236 MODULE_ALIAS("platform:tc6387xb");
 237