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 | |
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, size: sizeof(*simple), GFP_KERNEL); |
42 | if (!simple) |
43 | return -ENOMEM; |
44 | |
45 | platform_set_drvdata(pdev, data: 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(device: np, "rockchip,rk3399-dwc3" )) |
53 | simple->need_reset = true; |
54 | |
55 | simple->resets = of_reset_control_array_get(np, shared: false, optional: true, |
56 | acquired: true); |
57 | if (IS_ERR(ptr: simple->resets)) { |
58 | ret = PTR_ERR(ptr: 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(rstc: simple->resets); |
64 | if (ret) |
65 | goto err_resetc_put; |
66 | |
67 | ret = clk_bulk_get_all(dev: simple->dev, clks: &simple->clks); |
68 | if (ret < 0) |
69 | goto err_resetc_assert; |
70 | |
71 | simple->num_clocks = ret; |
72 | ret = clk_bulk_prepare_enable(num_clks: simple->num_clocks, clks: simple->clks); |
73 | if (ret) |
74 | goto err_resetc_assert; |
75 | |
76 | ret = of_platform_populate(root: np, NULL, NULL, parent: 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(num_clks: simple->num_clocks, clks: simple->clks); |
88 | clk_bulk_put_all(num_clks: simple->num_clocks, clks: simple->clks); |
89 | |
90 | err_resetc_assert: |
91 | reset_control_assert(rstc: simple->resets); |
92 | |
93 | err_resetc_put: |
94 | reset_control_put(rstc: simple->resets); |
95 | return ret; |
96 | } |
97 | |
98 | static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple) |
99 | { |
100 | of_platform_depopulate(parent: simple->dev); |
101 | |
102 | clk_bulk_disable_unprepare(num_clks: simple->num_clocks, clks: simple->clks); |
103 | clk_bulk_put_all(num_clks: simple->num_clocks, clks: simple->clks); |
104 | simple->num_clocks = 0; |
105 | |
106 | reset_control_assert(rstc: simple->resets); |
107 | |
108 | reset_control_put(rstc: simple->resets); |
109 | |
110 | pm_runtime_disable(dev: simple->dev); |
111 | pm_runtime_put_noidle(dev: simple->dev); |
112 | pm_runtime_set_suspended(dev: simple->dev); |
113 | } |
114 | |
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 | |
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 | |
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(num_clks: simple->num_clocks, clks: simple->clks); |
134 | |
135 | return 0; |
136 | } |
137 | |
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(num_clks: simple->num_clocks, clks: simple->clks); |
143 | } |
144 | |
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(rstc: simple->resets); |
151 | |
152 | return 0; |
153 | } |
154 | |
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(rstc: 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 | |