1// SPDX-License-Identifier: GPL-2.0
2/*
3 * dwc3-of-simple.c - OF glue layer for simple integrations
4 *
5 * Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com
6 *
7 * Author: Felipe Balbi <balbi@ti.com>
8 *
9 * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
10 * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
11 * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/platform_device.h>
18#include <linux/dma-mapping.h>
19#include <linux/clk.h>
20#include <linux/of.h>
21#include <linux/of_platform.h>
22#include <linux/pm_runtime.h>
23#include <linux/reset.h>
24
25struct dwc3_of_simple {
26	struct device		*dev;
27	struct clk_bulk_data	*clks;
28	int			num_clocks;
29	struct reset_control	*resets;
30	bool			need_reset;
31};
32
33static int dwc3_of_simple_probe(struct platform_device *pdev)
34{
35	struct dwc3_of_simple	*simple;
36	struct device		*dev = &pdev->dev;
37	struct device_node	*np = dev->of_node;
38
39	int			ret;
40
41	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
42	if (!simple)
43		return -ENOMEM;
44
45	platform_set_drvdata(pdev, simple);
46	simple->dev = dev;
47
48	/*
49	 * Some controllers need to toggle the usb3-otg reset before trying to
50	 * initialize the PHY, otherwise the PHY times out.
51	 */
52	if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
53		simple->need_reset = true;
54
55	simple->resets = of_reset_control_array_get(np, false, true,
56						    true);
57	if (IS_ERR(simple->resets)) {
58		ret = PTR_ERR(simple->resets);
59		dev_err(dev, "failed to get device resets, err=%d\n", ret);
60		return ret;
61	}
62
63	ret = reset_control_deassert(simple->resets);
64	if (ret)
65		goto err_resetc_put;
66
67	ret = clk_bulk_get_all(simple->dev, &simple->clks);
68	if (ret < 0)
69		goto err_resetc_assert;
70
71	simple->num_clocks = ret;
72	ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
73	if (ret)
74		goto err_resetc_assert;
75
76	ret = of_platform_populate(np, NULL, NULL, dev);
77	if (ret)
78		goto err_clk_put;
79
80	pm_runtime_set_active(dev);
81	pm_runtime_enable(dev);
82	pm_runtime_get_sync(dev);
83
84	return 0;
85
86err_clk_put:
87	clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
88	clk_bulk_put_all(simple->num_clocks, simple->clks);
89
90err_resetc_assert:
91	reset_control_assert(simple->resets);
92
93err_resetc_put:
94	reset_control_put(simple->resets);
95	return ret;
96}
97
98static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
99{
100	of_platform_depopulate(simple->dev);
101
102	clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
103	clk_bulk_put_all(simple->num_clocks, simple->clks);
104	simple->num_clocks = 0;
105
106	reset_control_assert(simple->resets);
107
108	reset_control_put(simple->resets);
109
110	pm_runtime_disable(simple->dev);
111	pm_runtime_put_noidle(simple->dev);
112	pm_runtime_set_suspended(simple->dev);
113}
114
115static int dwc3_of_simple_remove(struct platform_device *pdev)
116{
117	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
118
119	__dwc3_of_simple_teardown(simple);
120
121	return 0;
122}
123
124static void dwc3_of_simple_shutdown(struct platform_device *pdev)
125{
126	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
127
128	__dwc3_of_simple_teardown(simple);
129}
130
131static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
132{
133	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
134
135	clk_bulk_disable(simple->num_clocks, simple->clks);
136
137	return 0;
138}
139
140static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
141{
142	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
143
144	return clk_bulk_enable(simple->num_clocks, simple->clks);
145}
146
147static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
148{
149	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
150
151	if (simple->need_reset)
152		reset_control_assert(simple->resets);
153
154	return 0;
155}
156
157static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
158{
159	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
160
161	if (simple->need_reset)
162		reset_control_deassert(simple->resets);
163
164	return 0;
165}
166
167static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
168	SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
169	SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
170			dwc3_of_simple_runtime_resume, NULL)
171};
172
173static const struct of_device_id of_dwc3_simple_match[] = {
174	{ .compatible = "rockchip,rk3399-dwc3" },
175	{ .compatible = "xlnx,zynqmp-dwc3" },
176	{ .compatible = "cavium,octeon-7130-usb-uctl" },
177	{ .compatible = "sprd,sc9860-dwc3" },
178	{ .compatible = "allwinner,sun50i-h6-dwc3" },
179	{ .compatible = "hisilicon,hi3670-dwc3" },
180	{ .compatible = "intel,keembay-dwc3" },
181	{ /* Sentinel */ }
182};
183MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
184
185static struct platform_driver dwc3_of_simple_driver = {
186	.probe		= dwc3_of_simple_probe,
187	.remove		= dwc3_of_simple_remove,
188	.shutdown	= dwc3_of_simple_shutdown,
189	.driver		= {
190		.name	= "dwc3-of-simple",
191		.of_match_table = of_dwc3_simple_match,
192		.pm	= &dwc3_of_simple_dev_pm_ops,
193	},
194};
195
196module_platform_driver(dwc3_of_simple_driver);
197MODULE_LICENSE("GPL v2");
198MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
199MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
200