/*
* Universal Flash Storage Host controller Platform bus based glue driver
*
* This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
* Copyright (C) 2011-2013 Samsung India Software Operations
*
* Authors:
* Santosh Yaraganavi <santosh.sy@samsung.com>
* Vinayak Holikatti <h.vinayak@samsung.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* See the COPYING file in the top-level directory or visit
* <http://www.gnu.org/licenses/gpl-2.0.html>
*
* 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.
*
* This program is provided "AS IS" and "WITH ALL FAULTS" and
* without warranty of any kind. You are solely responsible for
* determining the appropriateness of using and distributing
* the program and assume all risks associated with your exercise
* of rights with respect to the program, including but not limited
* to infringement of third party rights, the risks and costs of
* program errors, damage to or loss of data, programs or equipment,
* and unavailability or interruption of operations. Under no
* circumstances will the contributor of this Program be liable for
* any damages of any kind arising from your use or distribution of
* this program.
*/
#include "ufshcd.h"
#include <linux/platform_device.h>
#ifdef CONFIG_PM
/**
* ufshcd_pltfrm_suspend - suspend power management function
* @dev: pointer to device handle
*
*
* Returns 0
*/
static int ufshcd_pltfrm_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ufs_hba *hba = platform_get_drvdata(pdev);
/*
* TODO:
* 1. Call ufshcd_suspend
* 2. Do bus specific power management
*/
disable_irq(hba->irq);
return 0;
}
/**
* ufshcd_pltfrm_resume - resume power management function
* @dev: pointer to device handle
*
* Returns 0
*/
static int ufshcd_pltfrm_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ufs_hba *hba = platform_get_drvdata(pdev);
/*
* TODO:
* 1. Call ufshcd_resume.
* 2. Do bus specific wake up
*/
enable_irq(hba->irq);
return 0;
}
#else
#define ufshcd_pltfrm_suspend NULL
#define ufshcd_pltfrm_resume NULL
#endif
/**
* ufshcd_pltfrm_probe - probe routine of the driver
* @pdev: pointer to Platform device handle
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_pltfrm_probe(struct platform_device *pdev)
{
struct ufs_hba *hba;
void __iomem *mmio_base;
struct resource *mem_res;
struct resource *irq_res;
resource_size_t mem_size;
int err;
struct device *dev = &pdev->dev;
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_res) {
dev_err(&pdev->dev,
"Memory resource not available\n");
err = -ENODEV;
goto out_error;
}
mem_size = resource_size(mem_res);
if (!request_mem_region(mem_res->start, mem_size, "ufshcd")) {
dev_err(&pdev->dev,
"Cannot reserve the memory resource\n");
err = -EBUSY;
goto out_error;
}
mmio_base = ioremap_nocache(mem_res->start, mem_size);
if (!mmio_base) {
dev_err(&pdev->dev, "memory map failed\n");
err = -ENOMEM;
goto out_release_regions;
}
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq_res) {
dev_err(&pdev->dev, "IRQ resource not available\n");
err = -ENODEV;
goto out_iounmap;
}
err = dma_set_coherent_mask(dev, dev->coherent_dma_mask);
if (err) {
dev_err(&pdev->dev, "set dma mask failed\n");
goto out_iounmap;
}
err = ufshcd_init(&pdev->dev, &hba, mmio_base, irq_res->start);
if (err) {
dev_err(&pdev->dev, "Intialization failed\n");
goto out_iounmap;
}
platform_set_drvdata(pdev, hba);
return 0;
out_iounmap:
iounmap(mmio_base);
out_release_regions:
release_mem_region(mem_res->start, mem_size);
out_error:
return err;
}
/**
* ufshcd_pltfrm_remove - remove platform driver routine
* @pdev: pointer to platform device handle
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_pltfrm_remove(struct platform_device *pdev)
{
struct resource *mem_res;
resource_size_t mem_size;
struct ufs_hba *hba = platform_get_drvdata(pdev);
disable_irq(hba->irq);
/* Some buggy controllers raise interrupt after
* the resources are removed. So first we unregister the
* irq handler and then the resources used by driver
*/
free_irq(hba->irq, hba);
ufshcd_remove(hba);
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_res)
dev_err(&pdev->dev, "ufshcd: Memory resource not available\n");
else {
mem_size = resource_size(mem_res);
release_mem_region(mem_res->start, mem_size);
}
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id ufs_of_match[] = {
{ .compatible = "jedec,ufs-1.1"},
};
static const struct dev_pm_ops ufshcd_dev_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
};
static struct platform_driver ufshcd_pltfrm_driver = {
.probe = ufshcd_pltfrm_probe,
.remove = ufshcd_pltfrm_remove,
.driver = {
.name = "ufshcd",
.owner = THIS_MODULE,
.pm = &ufshcd_dev_pm_ops,
.of_match_table = ufs_of_match,
},
};
module_platform_driver(ufshcd_pltfrm_driver);
MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(UFSHCD_DRIVER_VERSION);
