91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
|
|
//
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#define TI_UFS_SS_CTRL 0x4
|
|
#define TI_UFS_SS_RST_N_PCS BIT(0)
|
|
#define TI_UFS_SS_CLK_26MHZ BIT(4)
|
|
|
|
static int ti_j721e_ufs_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
unsigned long clk_rate;
|
|
void __iomem *regbase;
|
|
struct clk *clk;
|
|
u32 reg = 0;
|
|
int ret;
|
|
|
|
regbase = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(regbase))
|
|
return PTR_ERR(regbase);
|
|
|
|
pm_runtime_enable(dev);
|
|
ret = pm_runtime_get_sync(dev);
|
|
if (ret < 0) {
|
|
pm_runtime_put_noidle(dev);
|
|
return ret;
|
|
}
|
|
|
|
/* Select MPHY refclk frequency */
|
|
clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(clk)) {
|
|
dev_err(dev, "Cannot claim MPHY clock.\n");
|
|
return PTR_ERR(clk);
|
|
}
|
|
clk_rate = clk_get_rate(clk);
|
|
if (clk_rate == 26000000)
|
|
reg |= TI_UFS_SS_CLK_26MHZ;
|
|
devm_clk_put(dev, clk);
|
|
|
|
/* Take UFS slave device out of reset */
|
|
reg |= TI_UFS_SS_RST_N_PCS;
|
|
writel(reg, regbase + TI_UFS_SS_CTRL);
|
|
|
|
ret = of_platform_populate(pdev->dev.of_node, NULL, NULL,
|
|
dev);
|
|
if (ret) {
|
|
dev_err(dev, "failed to populate child nodes %d\n", ret);
|
|
pm_runtime_put_sync(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ti_j721e_ufs_remove(struct platform_device *pdev)
|
|
{
|
|
of_platform_depopulate(&pdev->dev);
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ti_j721e_ufs_of_match[] = {
|
|
{
|
|
.compatible = "ti,j721e-ufs",
|
|
},
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver ti_j721e_ufs_driver = {
|
|
.probe = ti_j721e_ufs_probe,
|
|
.remove = ti_j721e_ufs_remove,
|
|
.driver = {
|
|
.name = "ti-j721e-ufs",
|
|
.of_match_table = ti_j721e_ufs_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(ti_j721e_ufs_driver);
|
|
|
|
MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
|
|
MODULE_DESCRIPTION("TI UFS host controller glue driver");
|
|
MODULE_LICENSE("GPL v2");
|