summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3/dwc3-of-simple.c
blob: e64754be47b46f8e306cc48b7068b5c8043dae32 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
// SPDX-License-Identifier: GPL-2.0
/**
 * dwc3-of-simple.c - OF glue layer for simple integrations
 *
 * Copyright (c) 2015 Texas Instruments Incorporated - http://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			pulse_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;
	bool			shared_resets = false;

	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;

	if (of_device_is_compatible(np, "amlogic,meson-axg-dwc3") ||
	    of_device_is_compatible(np, "amlogic,meson-gxl-dwc3")) {
		shared_resets = true;
		simple->pulse_resets = true;
	}

	simple->resets = of_reset_control_array_get(np, shared_resets, 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;
	}

	if (simple->pulse_resets) {
		ret = reset_control_reset(simple->resets);
		if (ret)
			goto err_resetc_put;
	} else {
		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:
	if (!simple->pulse_resets)
		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;

	if (!simple->pulse_resets)
		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 = "amlogic,meson-axg-dwc3" },
	{ .compatible = "amlogic,meson-gxl-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>");