]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/usb/dwc3/dwc3-exynos.c
Merge branch 'drm-nouveau-next' of git://anongit.freedesktop.org/git/nouveau/linux-2.6
[karo-tx-linux.git] / drivers / usb / dwc3 / dwc3-exynos.c
1 /**
2  * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
3  *
4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5  *              http://www.samsung.com
6  *
7  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <linux/platform_data/dwc3-exynos.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/clk.h>
22 #include <linux/usb/otg.h>
23 #include <linux/usb/nop-usb-xceiv.h>
24 #include <linux/of.h>
25 #include <linux/of_platform.h>
26
27 struct dwc3_exynos {
28         struct platform_device  *usb2_phy;
29         struct platform_device  *usb3_phy;
30         struct device           *dev;
31
32         struct clk              *clk;
33 };
34
35 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
36 {
37         struct nop_usb_xceiv_platform_data pdata;
38         struct platform_device  *pdev;
39         int                     ret;
40
41         memset(&pdata, 0x00, sizeof(pdata));
42
43         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
44         if (!pdev)
45                 return -ENOMEM;
46
47         exynos->usb2_phy = pdev;
48         pdata.type = USB_PHY_TYPE_USB2;
49
50         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
51         if (ret)
52                 goto err1;
53
54         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
55         if (!pdev) {
56                 ret = -ENOMEM;
57                 goto err1;
58         }
59
60         exynos->usb3_phy = pdev;
61         pdata.type = USB_PHY_TYPE_USB3;
62
63         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
64         if (ret)
65                 goto err2;
66
67         ret = platform_device_add(exynos->usb2_phy);
68         if (ret)
69                 goto err2;
70
71         ret = platform_device_add(exynos->usb3_phy);
72         if (ret)
73                 goto err3;
74
75         return 0;
76
77 err3:
78         platform_device_del(exynos->usb2_phy);
79
80 err2:
81         platform_device_put(exynos->usb3_phy);
82
83 err1:
84         platform_device_put(exynos->usb2_phy);
85
86         return ret;
87 }
88
89 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
90 {
91         struct platform_device *pdev = to_platform_device(dev);
92
93         platform_device_unregister(pdev);
94
95         return 0;
96 }
97
98 static int dwc3_exynos_probe(struct platform_device *pdev)
99 {
100         struct dwc3_exynos      *exynos;
101         struct clk              *clk;
102         struct device           *dev = &pdev->dev;
103         struct device_node      *node = dev->of_node;
104
105         int                     ret = -ENOMEM;
106
107         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
108         if (!exynos) {
109                 dev_err(dev, "not enough memory\n");
110                 goto err1;
111         }
112
113         /*
114          * Right now device-tree probed devices don't get dma_mask set.
115          * Since shared usb code relies on it, set it here for now.
116          * Once we move to full device tree support this will vanish off.
117          */
118         if (!dev->dma_mask)
119                 dev->dma_mask = &dev->coherent_dma_mask;
120         if (!dev->coherent_dma_mask)
121                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
122
123         platform_set_drvdata(pdev, exynos);
124
125         ret = dwc3_exynos_register_phys(exynos);
126         if (ret) {
127                 dev_err(dev, "couldn't register PHYs\n");
128                 goto err1;
129         }
130
131         clk = devm_clk_get(dev, "usbdrd30");
132         if (IS_ERR(clk)) {
133                 dev_err(dev, "couldn't get clock\n");
134                 ret = -EINVAL;
135                 goto err1;
136         }
137
138         exynos->dev     = dev;
139         exynos->clk     = clk;
140
141         clk_prepare_enable(exynos->clk);
142
143         if (node) {
144                 ret = of_platform_populate(node, NULL, NULL, dev);
145                 if (ret) {
146                         dev_err(dev, "failed to add dwc3 core\n");
147                         goto err2;
148                 }
149         } else {
150                 dev_err(dev, "no device node, failed to add dwc3 core\n");
151                 ret = -ENODEV;
152                 goto err2;
153         }
154
155         return 0;
156
157 err2:
158         clk_disable_unprepare(clk);
159 err1:
160         return ret;
161 }
162
163 static int dwc3_exynos_remove(struct platform_device *pdev)
164 {
165         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
166
167         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
168         platform_device_unregister(exynos->usb2_phy);
169         platform_device_unregister(exynos->usb3_phy);
170
171         clk_disable_unprepare(exynos->clk);
172
173         return 0;
174 }
175
176 #ifdef CONFIG_OF
177 static const struct of_device_id exynos_dwc3_match[] = {
178         { .compatible = "samsung,exynos5250-dwusb3" },
179         {},
180 };
181 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
182 #endif
183
184 #ifdef CONFIG_PM_SLEEP
185 static int dwc3_exynos_suspend(struct device *dev)
186 {
187         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
188
189         clk_disable(exynos->clk);
190
191         return 0;
192 }
193
194 static int dwc3_exynos_resume(struct device *dev)
195 {
196         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
197
198         clk_enable(exynos->clk);
199
200         /* runtime set active to reflect active state. */
201         pm_runtime_disable(dev);
202         pm_runtime_set_active(dev);
203         pm_runtime_enable(dev);
204
205         return 0;
206 }
207
208 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
209         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
210 };
211
212 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
213 #else
214 #define DEV_PM_OPS      NULL
215 #endif /* CONFIG_PM_SLEEP */
216
217 static struct platform_driver dwc3_exynos_driver = {
218         .probe          = dwc3_exynos_probe,
219         .remove         = dwc3_exynos_remove,
220         .driver         = {
221                 .name   = "exynos-dwc3",
222                 .of_match_table = of_match_ptr(exynos_dwc3_match),
223                 .pm     = DEV_PM_OPS,
224         },
225 };
226
227 module_platform_driver(dwc3_exynos_driver);
228
229 MODULE_ALIAS("platform:exynos-dwc3");
230 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
231 MODULE_LICENSE("GPL");
232 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");