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         struct mmc_host *mmc = platform_get_drvdata(dev);
  31         int ret;
  32
  33         ret = tmio_mmc_host_suspend(&dev->dev);
  34
  35         /* Tell MFD core it can disable us now.*/
  36         if (!ret && cell->disable)
  37                 cell->disable(dev);
  38
  39         return ret;
  40 }
  41
  42 static int tmio_mmc_resume(struct platform_device *dev)
  43 {
  44         const struct mfd_cell *cell = mfd_get_cell(dev);
  45         struct mmc_host *mmc = platform_get_drvdata(dev);
  46         int ret = 0;
  47
  48         /* Tell the MFD core we are ready to be enabled */
  49         if (cell->resume)
  50                 ret = cell->resume(dev);
  51
  52         if (!ret)
  53                 ret = tmio_mmc_host_resume(&dev->dev);
  54
  55         return ret;
  56 }
  57 #else
  58 #define tmio_mmc_suspend NULL
  59 #define tmio_mmc_resume NULL
  60 #endif
  61
  62 static int __devinit tmio_mmc_probe(struct platform_device *pdev)
  63 {
  64         const struct mfd_cell *cell = mfd_get_cell(pdev);
  65         struct tmio_mmc_data *pdata;
  66         struct tmio_mmc_host *host;
  67         int ret = -EINVAL, irq;
  68
  69         if (pdev->num_resources != 2)
  70                 goto out;
  71
  72         pdata = pdev->dev.platform_data;
  73         if (!pdata || !pdata->hclk)
  74                 goto out;
  75
  76         irq = platform_get_irq(pdev, 0);
  77         if (irq < 0) {
  78                 ret = irq;
  79                 goto out;
  80         }
  81
  82         /* Tell the MFD core we are ready to be enabled */
  83         if (cell->enable) {
  84                 ret = cell->enable(pdev);
  85                 if (ret)
  86                         goto out;
  87         }
  88
  89         ret = tmio_mmc_host_probe(&host, pdev, pdata);
  90         if (ret)
  91                 goto cell_disable;
  92
  93         ret = request_irq(irq, tmio_mmc_irq, IRQF_DISABLED |
  94                           IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), host);
  95         if (ret)
  96                 goto host_remove;
  97
  98         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
  99                 (unsigned long)host->ctl, irq);
 100
 101         return 0;
 102
 103 host_remove:
 104         tmio_mmc_host_remove(host);
 105 cell_disable:
 106         if (cell->disable)
 107                 cell->disable(pdev);
 108 out:
 109         return ret;
 110 }
 111
 112 static int __devexit tmio_mmc_remove(struct platform_device *pdev)
 113 {
 114         const struct mfd_cell *cell = mfd_get_cell(pdev);
 115         struct mmc_host *mmc = platform_get_drvdata(pdev);
 116
 117         platform_set_drvdata(pdev, NULL);
 118
 119         if (mmc) {
 120                 struct tmio_mmc_host *host = mmc_priv(mmc);
 121                 free_irq(platform_get_irq(pdev, 0), host);
 122                 tmio_mmc_host_remove(host);
 123                 if (cell->disable)
 124                         cell->disable(pdev);
 125         }
 126
 127         return 0;
 128 }
 129
 130 /* ------------------- device registration ----------------------- */
 131
 132 static struct platform_driver tmio_mmc_driver = {
 133         .driver = {
 134                 .name = "tmio-mmc",
 135                 .owner = THIS_MODULE,
 136         },
 137         .probe = tmio_mmc_probe,
 138         .remove = __devexit_p(tmio_mmc_remove),
 139         .suspend = tmio_mmc_suspend,
 140         .resume = tmio_mmc_resume,
 141 };
 142
 143
 144 static int __init tmio_mmc_init(void)
 145 {
 146         return platform_driver_register(&tmio_mmc_driver);
 147 }
 148
 149 static void __exit tmio_mmc_exit(void)
 150 {
 151         platform_driver_unregister(&tmio_mmc_driver);
 152 }
 153
 154 module_init(tmio_mmc_init);
 155 module_exit(tmio_mmc_exit);
 156
 157 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 158 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 159 MODULE_LICENSE("GPL v2");
 160 MODULE_ALIAS("platform:tmio-mmc");