Commit | Line | Data |
---|---|---|
16adc674 FB |
1 | /** |
2 | * dwc3-of-simple.c - OF glue layer for simple integrations | |
3 | * | |
4 | * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com | |
5 | * | |
6 | * Author: Felipe Balbi <balbi@ti.com> | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 of | |
10 | * the License as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov | |
18 | * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC | |
19 | * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com> | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/dma-mapping.h> | |
27 | #include <linux/clk.h> | |
28 | #include <linux/clk-provider.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/of_platform.h> | |
31 | #include <linux/pm_runtime.h> | |
32 | ||
33 | struct dwc3_of_simple { | |
34 | struct device *dev; | |
35 | struct clk **clks; | |
36 | int num_clocks; | |
37 | }; | |
38 | ||
39 | static int dwc3_of_simple_probe(struct platform_device *pdev) | |
40 | { | |
41 | struct dwc3_of_simple *simple; | |
42 | struct device *dev = &pdev->dev; | |
43 | struct device_node *np = dev->of_node; | |
44 | ||
45 | int ret; | |
46 | int i; | |
47 | ||
48 | simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL); | |
49 | if (!simple) | |
50 | return -ENOMEM; | |
51 | ||
52 | ret = of_clk_get_parent_count(np); | |
53 | if (ret < 0) | |
54 | return ret; | |
55 | ||
56 | simple->num_clocks = ret; | |
57 | ||
58 | simple->clks = devm_kcalloc(dev, simple->num_clocks, | |
59 | sizeof(struct clk *), GFP_KERNEL); | |
60 | if (!simple->clks) | |
61 | return -ENOMEM; | |
62 | ||
63 | simple->dev = dev; | |
64 | ||
65 | for (i = 0; i < simple->num_clocks; i++) { | |
66 | struct clk *clk; | |
67 | ||
68 | clk = of_clk_get(np, i); | |
69 | if (IS_ERR(clk)) { | |
70 | while (--i >= 0) | |
71 | clk_put(simple->clks[i]); | |
72 | return PTR_ERR(clk); | |
73 | } | |
74 | ||
75 | ret = clk_prepare_enable(clk); | |
76 | if (ret < 0) { | |
77 | while (--i >= 0) { | |
78 | clk_disable_unprepare(simple->clks[i]); | |
79 | clk_put(simple->clks[i]); | |
80 | } | |
81 | clk_put(clk); | |
82 | ||
83 | return ret; | |
84 | } | |
85 | ||
86 | simple->clks[i] = clk; | |
87 | } | |
88 | ||
89 | ret = of_platform_populate(np, NULL, NULL, dev); | |
90 | if (ret) { | |
91 | for (i = 0; i < simple->num_clocks; i++) { | |
92 | clk_disable_unprepare(simple->clks[i]); | |
93 | clk_put(simple->clks[i]); | |
94 | } | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | pm_runtime_set_active(dev); | |
100 | pm_runtime_enable(dev); | |
101 | pm_runtime_get_sync(dev); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static int dwc3_of_simple_remove(struct platform_device *pdev) | |
107 | { | |
108 | struct dwc3_of_simple *simple = platform_get_drvdata(pdev); | |
109 | struct device *dev = &pdev->dev; | |
110 | int i; | |
111 | ||
112 | for (i = 0; i < simple->num_clocks; i++) { | |
113 | clk_unprepare(simple->clks[i]); | |
114 | clk_put(simple->clks[i]); | |
115 | } | |
116 | ||
117 | of_platform_depopulate(dev); | |
118 | ||
119 | pm_runtime_put_sync(dev); | |
120 | pm_runtime_disable(dev); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
5072cfc4 | 125 | #ifdef CONFIG_PM |
16adc674 FB |
126 | static int dwc3_of_simple_runtime_suspend(struct device *dev) |
127 | { | |
128 | struct dwc3_of_simple *simple = dev_get_drvdata(dev); | |
129 | int i; | |
130 | ||
131 | for (i = 0; i < simple->num_clocks; i++) | |
132 | clk_disable(simple->clks[i]); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int dwc3_of_simple_runtime_resume(struct device *dev) | |
138 | { | |
139 | struct dwc3_of_simple *simple = dev_get_drvdata(dev); | |
140 | int ret; | |
141 | int i; | |
142 | ||
143 | for (i = 0; i < simple->num_clocks; i++) { | |
144 | ret = clk_enable(simple->clks[i]); | |
145 | if (ret < 0) { | |
146 | while (--i >= 0) | |
147 | clk_disable(simple->clks[i]); | |
148 | return ret; | |
149 | } | |
150 | } | |
151 | ||
152 | return 0; | |
153 | } | |
5072cfc4 | 154 | #endif |
16adc674 FB |
155 | |
156 | static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { | |
157 | SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, | |
158 | dwc3_of_simple_runtime_resume, NULL) | |
159 | }; | |
160 | ||
161 | static const struct of_device_id of_dwc3_simple_match[] = { | |
162 | { .compatible = "qcom,dwc3" }, | |
163 | { .compatible = "xlnx,zynqmp-dwc3" }, | |
164 | { /* Sentinel */ } | |
165 | }; | |
166 | MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); | |
167 | ||
168 | static struct platform_driver dwc3_of_simple_driver = { | |
169 | .probe = dwc3_of_simple_probe, | |
170 | .remove = dwc3_of_simple_remove, | |
171 | .driver = { | |
172 | .name = "dwc3-of-simple", | |
173 | .of_match_table = of_dwc3_simple_match, | |
174 | }, | |
175 | }; | |
176 | ||
177 | module_platform_driver(dwc3_of_simple_driver); | |
178 | MODULE_LICENSE("GPL v2"); | |
179 | MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer"); | |
180 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); |