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