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(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
86 err_clk_put:
87 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
88 clk_bulk_put_all(simple->num_clocks, simple->clks);
89
90 err_resetc_assert:
91 reset_control_assert(simple->resets);
92
93 err_resetc_put:
94 reset_control_put(simple->resets);
95 return ret;
96 }
97
__dwc3_of_simple_teardown(struct dwc3_of_simple * simple)98 static 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
dwc3_of_simple_remove(struct platform_device * pdev)115 static void 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
dwc3_of_simple_shutdown(struct platform_device * pdev)122 static void dwc3_of_simple_shutdown(struct platform_device *pdev)
123 {
124 struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
125
126 __dwc3_of_simple_teardown(simple);
127 }
128
dwc3_of_simple_runtime_suspend(struct device * dev)129 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
130 {
131 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
132
133 clk_bulk_disable(simple->num_clocks, simple->clks);
134
135 return 0;
136 }
137
dwc3_of_simple_runtime_resume(struct device * dev)138 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
139 {
140 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
141
142 return clk_bulk_enable(simple->num_clocks, simple->clks);
143 }
144
dwc3_of_simple_suspend(struct device * dev)145 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
146 {
147 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
148
149 if (simple->need_reset)
150 reset_control_assert(simple->resets);
151
152 return 0;
153 }
154
dwc3_of_simple_resume(struct device * dev)155 static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
156 {
157 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
158
159 if (simple->need_reset)
160 reset_control_deassert(simple->resets);
161
162 return 0;
163 }
164
165 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
166 SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
167 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
168 dwc3_of_simple_runtime_resume, NULL)
169 };
170
171 static const struct of_device_id of_dwc3_simple_match[] = {
172 { .compatible = "rockchip,rk3399-dwc3" },
173 { .compatible = "sprd,sc9860-dwc3" },
174 { .compatible = "allwinner,sun50i-h6-dwc3" },
175 { .compatible = "hisilicon,hi3670-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