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d9152161 II |
1 | /* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_platform.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | struct dwc3_qcom { | |
22 | struct device *dev; | |
23 | ||
24 | struct clk *core_clk; | |
25 | struct clk *iface_clk; | |
26 | struct clk *sleep_clk; | |
27 | }; | |
28 | ||
29 | static int dwc3_qcom_probe(struct platform_device *pdev) | |
30 | { | |
31 | struct device_node *node = pdev->dev.of_node; | |
32 | struct dwc3_qcom *qdwc; | |
33 | int ret; | |
34 | ||
35 | qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL); | |
36 | if (!qdwc) | |
37 | return -ENOMEM; | |
38 | ||
39 | platform_set_drvdata(pdev, qdwc); | |
40 | ||
41 | qdwc->dev = &pdev->dev; | |
42 | ||
43 | qdwc->core_clk = devm_clk_get(qdwc->dev, "core"); | |
44 | if (IS_ERR(qdwc->core_clk)) { | |
45 | dev_err(qdwc->dev, "failed to get core clock\n"); | |
46 | return PTR_ERR(qdwc->core_clk); | |
47 | } | |
48 | ||
49 | qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface"); | |
50 | if (IS_ERR(qdwc->iface_clk)) { | |
2babd0d1 | 51 | dev_info(qdwc->dev, "failed to get optional iface clock\n"); |
d9152161 II |
52 | qdwc->iface_clk = NULL; |
53 | } | |
54 | ||
55 | qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep"); | |
56 | if (IS_ERR(qdwc->sleep_clk)) { | |
2babd0d1 | 57 | dev_info(qdwc->dev, "failed to get optional sleep clock\n"); |
d9152161 II |
58 | qdwc->sleep_clk = NULL; |
59 | } | |
60 | ||
61 | ret = clk_prepare_enable(qdwc->core_clk); | |
62 | if (ret) { | |
63 | dev_err(qdwc->dev, "failed to enable core clock\n"); | |
64 | goto err_core; | |
65 | } | |
66 | ||
67 | ret = clk_prepare_enable(qdwc->iface_clk); | |
68 | if (ret) { | |
69 | dev_err(qdwc->dev, "failed to enable optional iface clock\n"); | |
70 | goto err_iface; | |
71 | } | |
72 | ||
73 | ret = clk_prepare_enable(qdwc->sleep_clk); | |
74 | if (ret) { | |
75 | dev_err(qdwc->dev, "failed to enable optional sleep clock\n"); | |
76 | goto err_sleep; | |
77 | } | |
78 | ||
79 | ret = of_platform_populate(node, NULL, NULL, qdwc->dev); | |
80 | if (ret) { | |
81 | dev_err(qdwc->dev, "failed to register core - %d\n", ret); | |
82 | goto err_clks; | |
83 | } | |
84 | ||
85 | return 0; | |
86 | ||
87 | err_clks: | |
88 | clk_disable_unprepare(qdwc->sleep_clk); | |
89 | err_sleep: | |
90 | clk_disable_unprepare(qdwc->iface_clk); | |
91 | err_iface: | |
92 | clk_disable_unprepare(qdwc->core_clk); | |
93 | err_core: | |
94 | return ret; | |
95 | } | |
96 | ||
97 | static int dwc3_qcom_remove(struct platform_device *pdev) | |
98 | { | |
99 | struct dwc3_qcom *qdwc = platform_get_drvdata(pdev); | |
100 | ||
101 | of_platform_depopulate(&pdev->dev); | |
102 | ||
103 | clk_disable_unprepare(qdwc->sleep_clk); | |
104 | clk_disable_unprepare(qdwc->iface_clk); | |
105 | clk_disable_unprepare(qdwc->core_clk); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static const struct of_device_id of_dwc3_match[] = { | |
111 | { .compatible = "qcom,dwc3" }, | |
112 | { /* Sentinel */ } | |
113 | }; | |
114 | MODULE_DEVICE_TABLE(of, of_dwc3_match); | |
115 | ||
116 | static struct platform_driver dwc3_qcom_driver = { | |
117 | .probe = dwc3_qcom_probe, | |
118 | .remove = dwc3_qcom_remove, | |
119 | .driver = { | |
120 | .name = "qcom-dwc3", | |
d9152161 II |
121 | .of_match_table = of_dwc3_match, |
122 | }, | |
123 | }; | |
124 | ||
125 | module_platform_driver(dwc3_qcom_driver); | |
126 | ||
127 | MODULE_ALIAS("platform:qcom-dwc3"); | |
128 | MODULE_LICENSE("GPL v2"); | |
129 | MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer"); | |
130 | MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>"); |