Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
[pandora-kernel.git] / drivers / usb / musb / ux500.c
1 /*
2  * Copyright (C) 2010 ST-Ericsson AB
3  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
4  *
5  * Based on omap2430.c
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
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  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/clk.h>
26 #include <linux/io.h>
27 #include <linux/platform_device.h>
28
29 #include "musb_core.h"
30
31 struct ux500_glue {
32         struct device           *dev;
33         struct platform_device  *musb;
34         struct clk              *clk;
35 };
36 #define glue_to_musb(g) platform_get_drvdata(g->musb)
37
38 static int ux500_musb_init(struct musb *musb)
39 {
40         musb->xceiv = otg_get_transceiver();
41         if (!musb->xceiv) {
42                 pr_err("HS USB OTG: no transceiver configured\n");
43                 return -ENODEV;
44         }
45
46         return 0;
47 }
48
49 static int ux500_musb_exit(struct musb *musb)
50 {
51         otg_put_transceiver(musb->xceiv);
52
53         return 0;
54 }
55
56 static const struct musb_platform_ops ux500_ops = {
57         .init           = ux500_musb_init,
58         .exit           = ux500_musb_exit,
59 };
60
61 static int __init ux500_probe(struct platform_device *pdev)
62 {
63         struct musb_hdrc_platform_data  *pdata = pdev->dev.platform_data;
64         struct platform_device          *musb;
65         struct ux500_glue               *glue;
66         struct clk                      *clk;
67
68         int                             ret = -ENOMEM;
69
70         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
71         if (!glue) {
72                 dev_err(&pdev->dev, "failed to allocate glue context\n");
73                 goto err0;
74         }
75
76         musb = platform_device_alloc("musb-hdrc", -1);
77         if (!musb) {
78                 dev_err(&pdev->dev, "failed to allocate musb device\n");
79                 goto err1;
80         }
81
82         clk = clk_get(&pdev->dev, "usb");
83         if (IS_ERR(clk)) {
84                 dev_err(&pdev->dev, "failed to get clock\n");
85                 ret = PTR_ERR(clk);
86                 goto err2;
87         }
88
89         ret = clk_enable(clk);
90         if (ret) {
91                 dev_err(&pdev->dev, "failed to enable clock\n");
92                 goto err3;
93         }
94
95         musb->dev.parent                = &pdev->dev;
96
97         glue->dev                       = &pdev->dev;
98         glue->musb                      = musb;
99         glue->clk                       = clk;
100
101         pdata->platform_ops             = &ux500_ops;
102
103         platform_set_drvdata(pdev, glue);
104
105         ret = platform_device_add_resources(musb, pdev->resource,
106                         pdev->num_resources);
107         if (ret) {
108                 dev_err(&pdev->dev, "failed to add resources\n");
109                 goto err4;
110         }
111
112         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
113         if (ret) {
114                 dev_err(&pdev->dev, "failed to add platform_data\n");
115                 goto err4;
116         }
117
118         ret = platform_device_add(musb);
119         if (ret) {
120                 dev_err(&pdev->dev, "failed to register musb device\n");
121                 goto err4;
122         }
123
124         return 0;
125
126 err4:
127         clk_disable(clk);
128
129 err3:
130         clk_put(clk);
131
132 err2:
133         platform_device_put(musb);
134
135 err1:
136         kfree(glue);
137
138 err0:
139         return ret;
140 }
141
142 static int __exit ux500_remove(struct platform_device *pdev)
143 {
144         struct ux500_glue       *glue = platform_get_drvdata(pdev);
145
146         platform_device_del(glue->musb);
147         platform_device_put(glue->musb);
148         clk_disable(glue->clk);
149         clk_put(glue->clk);
150         kfree(glue);
151
152         return 0;
153 }
154
155 #ifdef CONFIG_PM
156 static int ux500_suspend(struct device *dev)
157 {
158         struct ux500_glue       *glue = dev_get_drvdata(dev);
159         struct musb             *musb = glue_to_musb(glue);
160
161         otg_set_suspend(musb->xceiv, 1);
162         clk_disable(glue->clk);
163
164         return 0;
165 }
166
167 static int ux500_resume(struct device *dev)
168 {
169         struct ux500_glue       *glue = dev_get_drvdata(dev);
170         struct musb             *musb = glue_to_musb(glue);
171         int                     ret;
172
173         ret = clk_enable(glue->clk);
174         if (ret) {
175                 dev_err(dev, "failed to enable clock\n");
176                 return ret;
177         }
178
179         otg_set_suspend(musb->xceiv, 0);
180
181         return 0;
182 }
183
184 static const struct dev_pm_ops ux500_pm_ops = {
185         .suspend        = ux500_suspend,
186         .resume         = ux500_resume,
187 };
188
189 #define DEV_PM_OPS      (&ux500_pm_ops)
190 #else
191 #define DEV_PM_OPS      NULL
192 #endif
193
194 static struct platform_driver ux500_driver = {
195         .remove         = __exit_p(ux500_remove),
196         .driver         = {
197                 .name   = "musb-ux500",
198                 .pm     = DEV_PM_OPS,
199         },
200 };
201
202 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
203 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
204 MODULE_LICENSE("GPL v2");
205
206 static int __init ux500_init(void)
207 {
208         return platform_driver_probe(&ux500_driver, ux500_probe);
209 }
210 subsys_initcall(ux500_init);
211
212 static void __exit ux500_exit(void)
213 {
214         platform_driver_unregister(&ux500_driver);
215 }
216 module_exit(ux500_exit);