169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
/*
|
|
* 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");
|
|
|