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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 - https://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_bulk_data *clks;
int num_clocks;
struct reset_control *resets;
bool need_reset;
};
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;
simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
if (!simple)
return -ENOMEM;
platform_set_drvdata(pdev, simple);
simple->dev = dev;
/*
* Some controllers need to toggle the usb3-otg reset before trying to
* initialize the PHY, otherwise the PHY times out.
*/
if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
simple->need_reset = true;
simple->resets = of_reset_control_array_get(np, false, true,
true);
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 = clk_bulk_get_all(simple->dev, &simple->clks);
if (ret < 0)
goto err_resetc_assert;
simple->num_clocks = ret;
ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
if (ret)
goto err_resetc_assert;
ret = of_platform_populate(np, NULL, NULL, dev);
if (ret)
goto err_clk_put;
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
return 0;
err_clk_put:
clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
clk_bulk_put_all(simple->num_clocks, simple->clks);
err_resetc_assert:
reset_control_assert(simple->resets);
err_resetc_put:
reset_control_put(simple->resets);
return ret;
}
static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
{
of_platform_depopulate(simple->dev);
clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
clk_bulk_put_all(simple->num_clocks, simple->clks);
simple->num_clocks = 0;
reset_control_assert(simple->resets);
reset_control_put(simple->resets);
pm_runtime_disable(simple->dev);
pm_runtime_put_noidle(simple->dev);
pm_runtime_set_suspended(simple->dev);
}
static int dwc3_of_simple_remove(struct platform_device *pdev)
{
struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
__dwc3_of_simple_teardown(simple);
return 0;
}
static void dwc3_of_simple_shutdown(struct platform_device *pdev)
{
struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
__dwc3_of_simple_teardown(simple);
}
static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
clk_bulk_disable(simple->num_clocks, simple->clks);
return 0;
}
static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
return clk_bulk_enable(simple->num_clocks, simple->clks);
}
static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
if (simple->need_reset)
reset_control_assert(simple->resets);
return 0;
}
static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
{
struct dwc3_of_simple *simple = dev_get_drvdata(dev);
if (simple->need_reset)
reset_control_deassert(simple->resets);
return 0;
}
static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
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 = "rockchip,rk3399-dwc3" },
{ .compatible = "xlnx,zynqmp-dwc3" },
{ .compatible = "cavium,octeon-7130-usb-uctl" },
{ .compatible = "sprd,sc9860-dwc3" },
{ .compatible = "allwinner,sun50i-h6-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,
.shutdown = dwc3_of_simple_shutdown,
.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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