1/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 */
12
13#include <linux/clk.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_platform.h>
19#include <linux/platform_device.h>
20
21struct dwc3_qcom {
22	struct device		*dev;
23
24	struct clk		*core_clk;
25	struct clk		*iface_clk;
26	struct clk		*sleep_clk;
27};
28
29static int dwc3_qcom_probe(struct platform_device *pdev)
30{
31	struct device_node *node = pdev->dev.of_node;
32	struct dwc3_qcom *qdwc;
33	int ret;
34
35	qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
36	if (!qdwc)
37		return -ENOMEM;
38
39	platform_set_drvdata(pdev, qdwc);
40
41	qdwc->dev = &pdev->dev;
42
43	qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
44	if (IS_ERR(qdwc->core_clk)) {
45		dev_err(qdwc->dev, "failed to get core clock\n");
46		return PTR_ERR(qdwc->core_clk);
47	}
48
49	qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
50	if (IS_ERR(qdwc->iface_clk)) {
51		dev_info(qdwc->dev, "failed to get optional iface clock\n");
52		qdwc->iface_clk = NULL;
53	}
54
55	qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
56	if (IS_ERR(qdwc->sleep_clk)) {
57		dev_info(qdwc->dev, "failed to get optional sleep clock\n");
58		qdwc->sleep_clk = NULL;
59	}
60
61	ret = clk_prepare_enable(qdwc->core_clk);
62	if (ret) {
63		dev_err(qdwc->dev, "failed to enable core clock\n");
64		goto err_core;
65	}
66
67	ret = clk_prepare_enable(qdwc->iface_clk);
68	if (ret) {
69		dev_err(qdwc->dev, "failed to enable optional iface clock\n");
70		goto err_iface;
71	}
72
73	ret = clk_prepare_enable(qdwc->sleep_clk);
74	if (ret) {
75		dev_err(qdwc->dev, "failed to enable optional sleep clock\n");
76		goto err_sleep;
77	}
78
79	ret = of_platform_populate(node, NULL, NULL, qdwc->dev);
80	if (ret) {
81		dev_err(qdwc->dev, "failed to register core - %d\n", ret);
82		goto err_clks;
83	}
84
85	return 0;
86
87err_clks:
88	clk_disable_unprepare(qdwc->sleep_clk);
89err_sleep:
90	clk_disable_unprepare(qdwc->iface_clk);
91err_iface:
92	clk_disable_unprepare(qdwc->core_clk);
93err_core:
94	return ret;
95}
96
97static int dwc3_qcom_remove(struct platform_device *pdev)
98{
99	struct dwc3_qcom *qdwc = platform_get_drvdata(pdev);
100
101	of_platform_depopulate(&pdev->dev);
102
103	clk_disable_unprepare(qdwc->sleep_clk);
104	clk_disable_unprepare(qdwc->iface_clk);
105	clk_disable_unprepare(qdwc->core_clk);
106
107	return 0;
108}
109
110static const struct of_device_id of_dwc3_match[] = {
111	{ .compatible = "qcom,dwc3" },
112	{ /* Sentinel */ }
113};
114MODULE_DEVICE_TABLE(of, of_dwc3_match);
115
116static struct platform_driver dwc3_qcom_driver = {
117	.probe		= dwc3_qcom_probe,
118	.remove		= dwc3_qcom_remove,
119	.driver		= {
120		.name	= "qcom-dwc3",
121		.of_match_table	= of_dwc3_match,
122	},
123};
124
125module_platform_driver(dwc3_qcom_driver);
126
127MODULE_ALIAS("platform:qcom-dwc3");
128MODULE_LICENSE("GPL v2");
129MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");
130MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
131