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// SPDX-License-Identifier: GPL-2.0
/**
* dwc3-of-simple.c - OF glue layer for simple integrations
*
* Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Felipe Balbi <balbi@ti.com>
*
* This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
* <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
* by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
struct dwc3_of_simple {
struct device *dev;
struct clk **clks;
int num_clocks;
struct reset_control *resets;
};
static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
{
struct device *dev = simple->dev;
struct device_node *np = dev->of_node;
int i;
simple->num_clocks = count;
if (!count)
return 0;
simple->clks = devm_kcalloc(dev, simple->num_clocks,
sizeof(struct clk *), GFP_KERNEL);
if (!simple->clks)
return -ENOMEM;
for (i = 0; i < simple->num_clocks; i++) {
struct clk *clk;
int ret;
clk = of_clk_get(np, i);
if (IS_ERR(clk)) {
while (--i >= 0) {
clk_disable_unprepare(simple->clks[i]);
clk_put(simple->clks[i]);
}
return PTR_ERR(clk);
}
ret = clk_prepare_enable(clk);
if (ret < 0) {
while (--i >= 0) {
clk_disable_unprepare(simple->clks[i]);
clk_put(simple->clks[i]);
}
clk_put(clk);
return ret;
}
simple->clks[i] = clk;
}
return 0;
}
static int dwc3_of_simple_probe(struct platform_device *pdev)
{
struct dwc3_of_simple *simple;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
int ret;
int i;
simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
if (!simple)
return -ENOMEM;
platform_set_drvdata(pdev, simple);
simple->dev = dev;
simple->resets = of_reset_control_array_get_optional_exclusive(np);
if (IS_ERR(simple->resets)) {
ret = PTR_ERR(simple->resets);
dev_err(dev, "failed to get device resets, err=%d\n", ret);
return ret;
}
ret = reset_control_deassert(simple->resets);
if (ret)
goto err_resetc_put;
ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
"clocks", "#clock-cells"));
if (ret)
goto err_resetc_assert;
ret = of_platform_populate(np, NULL, NULL, dev);
if (ret) {
for (i = 0; i < simple->num_clocks; i++) {
clk_disable_unprepare(simple->clks[i]);
clk_put(simple->clks[i]);
}
goto err_resetc_assert;
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
return 0;
err_resetc_assert:
reset_control_assert(simple->resets);
err_resetc_put:
reset_control_put(simple->resets);
return ret;
}
static int dwc3_of_simple_remove(struct platform_device *pdev)
{
struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
int i;
of_platform_depopulate(dev);
for (i = 0; i < simple->num_clocks; i++) {
clk_disable_unprepare(simple->clks[i]);
clk_put(simple->clks[i]);
}
reset_control_assert(simple->resets);
reset_control_put(simple->resets);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return 0;
}
#ifdef CONFIG_PM
static int dwc3_of_simple_runtime_suspend(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
int i;
for (i = 0; i < simple->num_clocks; i++)
clk_disable(simple->clks[i]);
return 0;
}
static int dwc3_of_simple_runtime_resume(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
int ret;
int i;
for (i = 0; i < simple->num_clocks; i++) {
ret = clk_enable(simple->clks[i]);
if (ret < 0) {
while (--i >= 0)
clk_disable(simple->clks[i]);
return ret;
}
}
return 0;
}
#endif
static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
dwc3_of_simple_runtime_resume, NULL)
};
static const struct of_device_id of_dwc3_simple_match[] = {
{ .compatible = "qcom,dwc3" },
{ .compatible = "rockchip,rk3399-dwc3" },
{ .compatible = "xlnx,zynqmp-dwc3" },
{ .compatible = "cavium,octeon-7130-usb-uctl" },
{ .compatible = "sprd,sc9860-dwc3" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
static struct platform_driver dwc3_of_simple_driver = {
.probe = dwc3_of_simple_probe,
.remove = dwc3_of_simple_remove,
.driver = {
.name = "dwc3-of-simple",
.of_match_table = of_dwc3_simple_match,
.pm = &dwc3_of_simple_dev_pm_ops,
},
};
module_platform_driver(dwc3_of_simple_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
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