xref: /linux/drivers/usb/dwc3/dwc3-of-simple.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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 
25 struct 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 
dwc3_of_simple_probe(struct platform_device * pdev)33 static 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_optional_exclusive(np);
56 	if (IS_ERR(simple->resets)) {
57 		ret = PTR_ERR(simple->resets);
58 		dev_err(dev, "failed to get device resets, err=%d\n", ret);
59 		return ret;
60 	}
61 
62 	ret = reset_control_deassert(simple->resets);
63 	if (ret)
64 		goto err_resetc_put;
65 
66 	ret = clk_bulk_get_all(simple->dev, &simple->clks);
67 	if (ret < 0)
68 		goto err_resetc_assert;
69 
70 	simple->num_clocks = ret;
71 	ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
72 	if (ret)
73 		goto err_resetc_assert;
74 
75 	ret = of_platform_populate(np, NULL, NULL, dev);
76 	if (ret)
77 		goto err_clk_put;
78 
79 	pm_runtime_set_active(dev);
80 	pm_runtime_enable(dev);
81 	pm_runtime_get_sync(dev);
82 
83 	return 0;
84 
85 err_clk_put:
86 	clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
87 	clk_bulk_put_all(simple->num_clocks, simple->clks);
88 
89 err_resetc_assert:
90 	reset_control_assert(simple->resets);
91 
92 err_resetc_put:
93 	reset_control_put(simple->resets);
94 	return ret;
95 }
96 
__dwc3_of_simple_teardown(struct dwc3_of_simple * simple)97 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
98 {
99 	of_platform_depopulate(simple->dev);
100 
101 	clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
102 	clk_bulk_put_all(simple->num_clocks, simple->clks);
103 	simple->num_clocks = 0;
104 
105 	reset_control_assert(simple->resets);
106 
107 	reset_control_put(simple->resets);
108 
109 	pm_runtime_disable(simple->dev);
110 	pm_runtime_put_noidle(simple->dev);
111 	pm_runtime_set_suspended(simple->dev);
112 }
113 
dwc3_of_simple_remove(struct platform_device * pdev)114 static void dwc3_of_simple_remove(struct platform_device *pdev)
115 {
116 	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
117 
118 	__dwc3_of_simple_teardown(simple);
119 }
120 
dwc3_of_simple_shutdown(struct platform_device * pdev)121 static void dwc3_of_simple_shutdown(struct platform_device *pdev)
122 {
123 	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
124 
125 	__dwc3_of_simple_teardown(simple);
126 }
127 
dwc3_of_simple_runtime_suspend(struct device * dev)128 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
129 {
130 	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
131 
132 	clk_bulk_disable(simple->num_clocks, simple->clks);
133 
134 	return 0;
135 }
136 
dwc3_of_simple_runtime_resume(struct device * dev)137 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
138 {
139 	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
140 
141 	return clk_bulk_enable(simple->num_clocks, simple->clks);
142 }
143 
dwc3_of_simple_suspend(struct device * dev)144 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
145 {
146 	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
147 
148 	if (simple->need_reset)
149 		reset_control_assert(simple->resets);
150 
151 	return 0;
152 }
153 
dwc3_of_simple_resume(struct device * dev)154 static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
155 {
156 	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
157 
158 	if (simple->need_reset)
159 		reset_control_deassert(simple->resets);
160 
161 	return 0;
162 }
163 
164 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
165 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
166 	SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
167 			dwc3_of_simple_runtime_resume, NULL)
168 };
169 
170 static const struct of_device_id of_dwc3_simple_match[] = {
171 	{ .compatible = "rockchip,rk3399-dwc3" },
172 	{ .compatible = "sprd,sc9860-dwc3" },
173 	{ .compatible = "allwinner,sun50i-h6-dwc3" },
174 	{ .compatible = "hisilicon,hi3670-dwc3" },
175 	{ .compatible = "hisilicon,hi3798mv200-dwc3" },
176 	{ .compatible = "intel,keembay-dwc3" },
177 	{ /* Sentinel */ }
178 };
179 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
180 
181 static struct platform_driver dwc3_of_simple_driver = {
182 	.probe		= dwc3_of_simple_probe,
183 	.remove_new	= dwc3_of_simple_remove,
184 	.shutdown	= dwc3_of_simple_shutdown,
185 	.driver		= {
186 		.name	= "dwc3-of-simple",
187 		.of_match_table = of_dwc3_simple_match,
188 		.pm	= &dwc3_of_simple_dev_pm_ops,
189 	},
190 };
191 
192 module_platform_driver(dwc3_of_simple_driver);
193 MODULE_LICENSE("GPL v2");
194 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
195 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
196