GNU Linux-libre 4.14.290-gnu1
[releases.git] / drivers / usb / chipidea / ci_hdrc_usb2.c
1 /*
2  * Copyright (C) 2014 Marvell Technology Group Ltd.
3  *
4  * Antoine Tenart <antoine.tenart@free-electrons.com>
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2. This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/of_platform.h>
16 #include <linux/phy/phy.h>
17 #include <linux/platform_device.h>
18 #include <linux/usb/chipidea.h>
19 #include <linux/usb/hcd.h>
20 #include <linux/usb/ulpi.h>
21
22 #include "ci.h"
23
24 struct ci_hdrc_usb2_priv {
25         struct platform_device  *ci_pdev;
26         struct clk              *clk;
27 };
28
29 static const struct ci_hdrc_platform_data ci_default_pdata = {
30         .capoffset      = DEF_CAPOFFSET,
31         .flags          = CI_HDRC_DISABLE_STREAMING,
32 };
33
34 static struct ci_hdrc_platform_data ci_zynq_pdata = {
35         .capoffset      = DEF_CAPOFFSET,
36 };
37
38 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
39         { .compatible = "chipidea,usb2"},
40         { .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata},
41         { }
42 };
43 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
44
45 static int ci_hdrc_usb2_probe(struct platform_device *pdev)
46 {
47         struct device *dev = &pdev->dev;
48         struct ci_hdrc_usb2_priv *priv;
49         struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
50         int ret;
51         const struct of_device_id *match;
52
53         if (!ci_pdata) {
54                 ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
55                 if (!ci_pdata)
56                         return -ENOMEM;
57                 *ci_pdata = ci_default_pdata;   /* struct copy */
58         }
59
60         match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
61         if (match && match->data) {
62                 /* struct copy */
63                 *ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
64         }
65
66         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
67         if (!priv)
68                 return -ENOMEM;
69
70         priv->clk = devm_clk_get(dev, NULL);
71         if (!IS_ERR(priv->clk)) {
72                 ret = clk_prepare_enable(priv->clk);
73                 if (ret) {
74                         dev_err(dev, "failed to enable the clock: %d\n", ret);
75                         return ret;
76                 }
77         }
78
79         ci_pdata->name = dev_name(dev);
80
81         priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
82                                            pdev->num_resources, ci_pdata);
83         if (IS_ERR(priv->ci_pdev)) {
84                 ret = PTR_ERR(priv->ci_pdev);
85                 if (ret != -EPROBE_DEFER)
86                         dev_err(dev,
87                                 "failed to register ci_hdrc platform device: %d\n",
88                                 ret);
89                 goto clk_err;
90         }
91
92         platform_set_drvdata(pdev, priv);
93
94         pm_runtime_no_callbacks(dev);
95         pm_runtime_enable(dev);
96
97         return 0;
98
99 clk_err:
100         if (!IS_ERR(priv->clk))
101                 clk_disable_unprepare(priv->clk);
102         return ret;
103 }
104
105 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
106 {
107         struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
108
109         pm_runtime_disable(&pdev->dev);
110         ci_hdrc_remove_device(priv->ci_pdev);
111         clk_disable_unprepare(priv->clk);
112
113         return 0;
114 }
115
116 static struct platform_driver ci_hdrc_usb2_driver = {
117         .probe  = ci_hdrc_usb2_probe,
118         .remove = ci_hdrc_usb2_remove,
119         .driver = {
120                 .name           = "chipidea-usb2",
121                 .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
122         },
123 };
124 module_platform_driver(ci_hdrc_usb2_driver);
125
126 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
127 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
128 MODULE_LICENSE("GPL");