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/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
struct dwc3_qcom {
struct device *dev;
struct clk *core_clk;
struct clk *iface_clk;
struct clk *sleep_clk;
};
static int dwc3_qcom_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct dwc3_qcom *qdwc;
int ret;
qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
if (!qdwc)
return -ENOMEM;
platform_set_drvdata(pdev, qdwc);
qdwc->dev = &pdev->dev;
qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
if (IS_ERR(qdwc->core_clk)) {
dev_err(qdwc->dev, "failed to get core clock\n");
return PTR_ERR(qdwc->core_clk);
}
qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
if (IS_ERR(qdwc->iface_clk)) {
dev_info(qdwc->dev, "failed to get optional iface clock\n");
qdwc->iface_clk = NULL;
}
qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
if (IS_ERR(qdwc->sleep_clk)) {
dev_info(qdwc->dev, "failed to get optional sleep clock\n");
qdwc->sleep_clk = NULL;
}
ret = clk_prepare_enable(qdwc->core_clk);
if (ret) {
dev_err(qdwc->dev, "failed to enable core clock\n");
goto err_core;
}
ret = clk_prepare_enable(qdwc->iface_clk);
if (ret) {
dev_err(qdwc->dev, "failed to enable optional iface clock\n");
goto err_iface;
}
ret = clk_prepare_enable(qdwc->sleep_clk);
if (ret) {
dev_err(qdwc->dev, "failed to enable optional sleep clock\n");
goto err_sleep;
}
ret = of_platform_populate(node, NULL, NULL, qdwc->dev);
if (ret) {
dev_err(qdwc->dev, "failed to register core - %d\n", ret);
goto err_clks;
}
return 0;
err_clks:
clk_disable_unprepare(qdwc->sleep_clk);
err_sleep:
clk_disable_unprepare(qdwc->iface_clk);
err_iface:
clk_disable_unprepare(qdwc->core_clk);
err_core:
return ret;
}
static int dwc3_qcom_remove(struct platform_device *pdev)
{
struct dwc3_qcom *qdwc = platform_get_drvdata(pdev);
of_platform_depopulate(&pdev->dev);
clk_disable_unprepare(qdwc->sleep_clk);
clk_disable_unprepare(qdwc->iface_clk);
clk_disable_unprepare(qdwc->core_clk);
return 0;
}
static const struct of_device_id of_dwc3_match[] = {
{ .compatible = "qcom,dwc3" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_dwc3_match);
static struct platform_driver dwc3_qcom_driver = {
.probe = dwc3_qcom_probe,
.remove = dwc3_qcom_remove,
.driver = {
.name = "qcom-dwc3",
.of_match_table = of_dwc3_match,
},
};
module_platform_driver(dwc3_qcom_driver);
MODULE_ALIAS("platform:qcom-dwc3");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");
MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
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