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