LXR linux/drivers/mmc/host/tmio

   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
  27static 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
  41static 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
  60static 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
 101host_remove:
 102        tmio_mmc_host_remove(host);
 103cell_disable:
 104        if (cell->disable)
 105                cell->disable(pdev);
 106out:
 107        return ret;
 108}
 109
 110static 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        platform_set_drvdata(pdev, NULL);
 116
 117        if (mmc) {
 118                struct tmio_mmc_host *host = mmc_priv(mmc);
 119                free_irq(platform_get_irq(pdev, 0), host);
 120                tmio_mmc_host_remove(host);
 121                if (cell->disable)
 122                        cell->disable(pdev);
 123        }
 124
 125        return 0;
 126}
 127
 128/* ------------------- device registration ----------------------- */
 129
 130static struct platform_driver tmio_mmc_driver = {
 131        .driver = {
 132                .name = "tmio-mmc",
 133                .owner = THIS_MODULE,
 134        },
 135        .probe = tmio_mmc_probe,
 136        .remove = tmio_mmc_remove,
 137        .suspend = tmio_mmc_suspend,
 138        .resume = tmio_mmc_resume,
 139};
 140
 141module_platform_driver(tmio_mmc_driver);
 142
 143MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 144MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 145MODULE_LICENSE("GPL v2");
 146MODULE_ALIAS("platform:tmio-mmc");
 147