drivers/mmc/host/tmio_mmc.c

   1 /*
   2  * linux/drivers/mmc/host/tmio_mmc.c
   3  *
   4  * Copyright (C) 2007 Ian Molton
   5  * Copyright (C) 2004 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Driver for the MMC / SD / SDIO cell found in:
  12  *
  13  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/tmio.h>
  19 #include <linux/mmc/host.h>
  20 #include <linux/module.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/scatterlist.h>
  23
  24 #include "tmio_mmc.h"
  25
  26 #ifdef CONFIG_PM
  27 static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state)
  28 {
  29         const struct mfd_cell *cell = mfd_get_cell(dev);
  30         int ret;
  31
  32         ret = tmio_mmc_host_suspend(&dev->dev);
  33
  34         /* Tell MFD core it can disable us now.*/
  35         if (!ret && cell->disable)
  36                 cell->disable(dev);
  37
  38         return ret;
  39 }
  40
  41 static int tmio_mmc_resume(struct platform_device *dev)
  42 {
  43         const struct mfd_cell *cell = mfd_get_cell(dev);
  44         int ret = 0;
  45
  46         /* Tell the MFD core we are ready to be enabled */
  47         if (cell->resume)
  48                 ret = cell->resume(dev);
  49
  50         if (!ret)
  51                 ret = tmio_mmc_host_resume(&dev->dev);
  52
  53         return ret;
  54 }
  55 #else
  56 #define tmio_mmc_suspend NULL
  57 #define tmio_mmc_resume NULL
  58 #endif
  59
  60 static int tmio_mmc_probe(struct platform_device *pdev)
  61 {
  62         const struct mfd_cell *cell = mfd_get_cell(pdev);
  63         struct tmio_mmc_data *pdata;
  64         struct tmio_mmc_host *host;
  65         struct resource *res;
  66         int ret = -EINVAL, irq;
  67
  68         if (pdev->num_resources != 2)
  69                 goto out;
  70
  71         pdata = pdev->dev.platform_data;
  72         if (!pdata || !pdata->hclk)
  73                 goto out;
  74
  75         irq = platform_get_irq(pdev, 0);
  76         if (irq < 0) {
  77                 ret = irq;
  78                 goto out;
  79         }
  80
  81         /* Tell the MFD core we are ready to be enabled */
  82         if (cell->enable) {
  83                 ret = cell->enable(pdev);
  84                 if (ret)
  85                         goto out;
  86         }
  87
  88         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  89         if (!res)
  90                 return -EINVAL;
  91
  92         /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
  93         pdata->bus_shift = resource_size(res) >> 10;
  94         pdata->flags |= TMIO_MMC_HAVE_HIGH_REG;
  95
  96         ret = tmio_mmc_host_probe(&host, pdev, pdata);
  97         if (ret)
  98                 goto cell_disable;
  99
 100         ret = request_irq(irq, tmio_mmc_irq, IRQF_TRIGGER_FALLING,
 101                                 dev_name(&pdev->dev), host);
 102         if (ret)
 103                 goto host_remove;
 104
 105         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
 106                 (unsigned long)host->ctl, irq);
 107
 108         return 0;
 109
 110 host_remove:
 111         tmio_mmc_host_remove(host);
 112 cell_disable:
 113         if (cell->disable)
 114                 cell->disable(pdev);
 115 out:
 116         return ret;
 117 }
 118
 119 static int tmio_mmc_remove(struct platform_device *pdev)
 120 {
 121         const struct mfd_cell *cell = mfd_get_cell(pdev);
 122         struct mmc_host *mmc = platform_get_drvdata(pdev);
 123
 124         if (mmc) {
 125                 struct tmio_mmc_host *host = mmc_priv(mmc);
 126                 free_irq(platform_get_irq(pdev, 0), host);
 127                 tmio_mmc_host_remove(host);
 128                 if (cell->disable)
 129                         cell->disable(pdev);
 130         }
 131
 132         return 0;
 133 }
 134
 135 /* ------------------- device registration ----------------------- */
 136
 137 static struct platform_driver tmio_mmc_driver = {
 138         .driver = {
 139                 .name = "tmio-mmc",
 140                 .owner = THIS_MODULE,
 141         },
 142         .probe = tmio_mmc_probe,
 143         .remove = tmio_mmc_remove,
 144         .suspend = tmio_mmc_suspend,
 145         .resume = tmio_mmc_resume,
 146 };
 147
 148 module_platform_driver(tmio_mmc_driver);
 149
 150 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 151 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 152 MODULE_LICENSE("GPL v2");
 153 MODULE_ALIAS("platform:tmio-mmc");