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657b306a KVA |
1 | /* |
2 | * omap-usb2.c - USB PHY, talking to musb controller in OMAP. | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * Author: Kishon Vijay Abraham I <kishon@ti.com> | |
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 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/io.h> | |
24 | #include <linux/usb/omap_usb.h> | |
25 | #include <linux/usb/phy_companion.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/pm_runtime.h> | |
29 | #include <linux/delay.h> | |
ca784be3 | 30 | #include <linux/usb/omap_control_usb.h> |
657b306a KVA |
31 | |
32 | /** | |
33 | * omap_usb2_set_comparator - links the comparator present in the sytem with | |
34 | * this phy | |
35 | * @comparator - the companion phy(comparator) for this phy | |
36 | * | |
37 | * The phy companion driver should call this API passing the phy_companion | |
38 | * filled with set_vbus and start_srp to be used by usb phy. | |
39 | * | |
40 | * For use by phy companion driver | |
41 | */ | |
42 | int omap_usb2_set_comparator(struct phy_companion *comparator) | |
43 | { | |
44 | struct omap_usb *phy; | |
45 | struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2); | |
46 | ||
47 | if (IS_ERR(x)) | |
48 | return -ENODEV; | |
49 | ||
50 | phy = phy_to_omapusb(x); | |
51 | phy->comparator = comparator; | |
52 | return 0; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(omap_usb2_set_comparator); | |
55 | ||
657b306a KVA |
56 | static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled) |
57 | { | |
58 | struct omap_usb *phy = phy_to_omapusb(otg->phy); | |
59 | ||
60 | if (!phy->comparator) | |
61 | return -ENODEV; | |
62 | ||
63 | return phy->comparator->set_vbus(phy->comparator, enabled); | |
64 | } | |
65 | ||
66 | static int omap_usb_start_srp(struct usb_otg *otg) | |
67 | { | |
68 | struct omap_usb *phy = phy_to_omapusb(otg->phy); | |
69 | ||
70 | if (!phy->comparator) | |
71 | return -ENODEV; | |
72 | ||
73 | return phy->comparator->start_srp(phy->comparator); | |
74 | } | |
75 | ||
76 | static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host) | |
77 | { | |
78 | struct usb_phy *phy = otg->phy; | |
79 | ||
80 | otg->host = host; | |
81 | if (!host) | |
82 | phy->state = OTG_STATE_UNDEFINED; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int omap_usb_set_peripheral(struct usb_otg *otg, | |
88 | struct usb_gadget *gadget) | |
89 | { | |
90 | struct usb_phy *phy = otg->phy; | |
91 | ||
92 | otg->gadget = gadget; | |
93 | if (!gadget) | |
94 | phy->state = OTG_STATE_UNDEFINED; | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int omap_usb2_suspend(struct usb_phy *x, int suspend) | |
100 | { | |
101 | u32 ret; | |
102 | struct omap_usb *phy = phy_to_omapusb(x); | |
103 | ||
104 | if (suspend && !phy->is_suspended) { | |
ca784be3 | 105 | omap_control_usb_phy_power(phy->control_dev, 0); |
657b306a KVA |
106 | pm_runtime_put_sync(phy->dev); |
107 | phy->is_suspended = 1; | |
108 | } else if (!suspend && phy->is_suspended) { | |
109 | ret = pm_runtime_get_sync(phy->dev); | |
110 | if (ret < 0) { | |
111 | dev_err(phy->dev, "get_sync failed with err %d\n", | |
112 | ret); | |
113 | return ret; | |
114 | } | |
ca784be3 | 115 | omap_control_usb_phy_power(phy->control_dev, 1); |
657b306a KVA |
116 | phy->is_suspended = 0; |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
41ac7b3a | 122 | static int omap_usb2_probe(struct platform_device *pdev) |
657b306a KVA |
123 | { |
124 | struct omap_usb *phy; | |
125 | struct usb_otg *otg; | |
657b306a KVA |
126 | |
127 | phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); | |
128 | if (!phy) { | |
129 | dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n"); | |
130 | return -ENOMEM; | |
131 | } | |
132 | ||
133 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); | |
134 | if (!otg) { | |
135 | dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n"); | |
136 | return -ENOMEM; | |
137 | } | |
138 | ||
139 | phy->dev = &pdev->dev; | |
140 | ||
141 | phy->phy.dev = phy->dev; | |
142 | phy->phy.label = "omap-usb2"; | |
143 | phy->phy.set_suspend = omap_usb2_suspend; | |
144 | phy->phy.otg = otg; | |
145 | ||
ca784be3 KVA |
146 | phy->control_dev = omap_get_control_dev(); |
147 | if (IS_ERR(phy->control_dev)) { | |
148 | dev_dbg(&pdev->dev, "Failed to get control device\n"); | |
149 | return -ENODEV; | |
657b306a KVA |
150 | } |
151 | ||
152 | phy->is_suspended = 1; | |
ca784be3 | 153 | omap_control_usb_phy_power(phy->control_dev, 0); |
657b306a KVA |
154 | |
155 | otg->set_host = omap_usb_set_host; | |
156 | otg->set_peripheral = omap_usb_set_peripheral; | |
157 | otg->set_vbus = omap_usb_set_vbus; | |
158 | otg->start_srp = omap_usb_start_srp; | |
159 | otg->phy = &phy->phy; | |
160 | ||
161 | phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); | |
162 | if (IS_ERR(phy->wkupclk)) { | |
163 | dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); | |
164 | return PTR_ERR(phy->wkupclk); | |
165 | } | |
166 | clk_prepare(phy->wkupclk); | |
167 | ||
168 | usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2); | |
169 | ||
170 | platform_set_drvdata(pdev, phy); | |
171 | ||
172 | pm_runtime_enable(phy->dev); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
fb4e98ab | 177 | static int omap_usb2_remove(struct platform_device *pdev) |
657b306a KVA |
178 | { |
179 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
180 | ||
181 | clk_unprepare(phy->wkupclk); | |
182 | usb_remove_phy(&phy->phy); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | #ifdef CONFIG_PM_RUNTIME | |
188 | ||
189 | static int omap_usb2_runtime_suspend(struct device *dev) | |
190 | { | |
191 | struct platform_device *pdev = to_platform_device(dev); | |
192 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
193 | ||
194 | clk_disable(phy->wkupclk); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int omap_usb2_runtime_resume(struct device *dev) | |
200 | { | |
201 | u32 ret = 0; | |
202 | struct platform_device *pdev = to_platform_device(dev); | |
203 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
204 | ||
205 | ret = clk_enable(phy->wkupclk); | |
206 | if (ret < 0) | |
207 | dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | static const struct dev_pm_ops omap_usb2_pm_ops = { | |
213 | SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, | |
214 | NULL) | |
215 | }; | |
216 | ||
217 | #define DEV_PM_OPS (&omap_usb2_pm_ops) | |
218 | #else | |
219 | #define DEV_PM_OPS NULL | |
220 | #endif | |
221 | ||
222 | #ifdef CONFIG_OF | |
223 | static const struct of_device_id omap_usb2_id_table[] = { | |
224 | { .compatible = "ti,omap-usb2" }, | |
225 | {} | |
226 | }; | |
227 | MODULE_DEVICE_TABLE(of, omap_usb2_id_table); | |
228 | #endif | |
229 | ||
230 | static struct platform_driver omap_usb2_driver = { | |
231 | .probe = omap_usb2_probe, | |
7690417d | 232 | .remove = omap_usb2_remove, |
657b306a KVA |
233 | .driver = { |
234 | .name = "omap-usb2", | |
235 | .owner = THIS_MODULE, | |
236 | .pm = DEV_PM_OPS, | |
237 | .of_match_table = of_match_ptr(omap_usb2_id_table), | |
238 | }, | |
239 | }; | |
240 | ||
241 | module_platform_driver(omap_usb2_driver); | |
242 | ||
243 | MODULE_ALIAS("platform: omap_usb2"); | |
244 | MODULE_AUTHOR("Texas Instruments Inc."); | |
245 | MODULE_DESCRIPTION("OMAP USB2 phy driver"); | |
246 | MODULE_LICENSE("GPL v2"); |