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/*
* sdhci-pltfm.c Support for SDHCI platform devices
* Copyright (c) 2009 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Supports:
* SDHCI platform devices
*
* Inspired by sdhci-pci.c, by Pierre Ossman
*/
#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/platform_device.h>
#include <linux/mmc/host.h>
#include <linux/io.h>
#include "sdhci.h"
/*****************************************************************************\
* *
* SDHCI core callbacks *
* *
\*****************************************************************************/
static struct sdhci_ops sdhci_pltfm_ops = {
};
/*****************************************************************************\
* *
* Device probing/removal *
* *
\*****************************************************************************/
static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct resource *iomem;
int ret;
BUG_ON(pdev == NULL);
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iomem) {
ret = -ENOMEM;
goto err;
}
if (resource_size(iomem) != 0x100)
dev_err(&pdev->dev, "Invalid iomem size. You may "
"experience problems.\n");
if (pdev->dev.parent)
host = sdhci_alloc_host(pdev->dev.parent, 0);
else
host = sdhci_alloc_host(&pdev->dev, 0);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto err;
}
host->hw_name = "platform";
host->ops = &sdhci_pltfm_ops;
host->irq = platform_get_irq(pdev, 0);
if (!request_mem_region(iomem->start, resource_size(iomem),
mmc_hostname(host->mmc))) {
dev_err(&pdev->dev, "cannot request region\n");
ret = -EBUSY;
goto err_request;
}
host->ioaddr = ioremap(iomem->start, resource_size(iomem));
if (!host->ioaddr) {
dev_err(&pdev->dev, "failed to remap registers\n");
ret = -ENOMEM;
goto err_remap;
}
ret = sdhci_add_host(host);
if (ret)
goto err_add_host;
platform_set_drvdata(pdev, host);
return 0;
err_add_host:
iounmap(host->ioaddr);
err_remap:
release_mem_region(iomem->start, resource_size(iomem));
err_request:
sdhci_free_host(host);
err:
printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
return ret;
}
static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int dead;
u32 scratch;
dead = 0;
scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
if (scratch == (u32)-1)
dead = 1;
sdhci_remove_host(host, dead);
iounmap(host->ioaddr);
release_mem_region(iomem->start, resource_size(iomem));
sdhci_free_host(host);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver sdhci_pltfm_driver = {
.driver = {
.name = "sdhci",
.owner = THIS_MODULE,
},
.probe = sdhci_pltfm_probe,
.remove = __devexit_p(sdhci_pltfm_remove),
};
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
static int __init sdhci_drv_init(void)
{
return platform_driver_register(&sdhci_pltfm_driver);
}
static void __exit sdhci_drv_exit(void)
{
platform_driver_unregister(&sdhci_pltfm_driver);
}
module_init(sdhci_drv_init);
module_exit(sdhci_drv_exit);
MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci");
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