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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> | |
30 | ||
31 | /** | |
32 | * omap_usb2_set_comparator - links the comparator present in the sytem with | |
33 | * this phy | |
34 | * @comparator - the companion phy(comparator) for this phy | |
35 | * | |
36 | * The phy companion driver should call this API passing the phy_companion | |
37 | * filled with set_vbus and start_srp to be used by usb phy. | |
38 | * | |
39 | * For use by phy companion driver | |
40 | */ | |
41 | int omap_usb2_set_comparator(struct phy_companion *comparator) | |
42 | { | |
43 | struct omap_usb *phy; | |
44 | struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2); | |
45 | ||
46 | if (IS_ERR(x)) | |
47 | return -ENODEV; | |
48 | ||
49 | phy = phy_to_omapusb(x); | |
50 | phy->comparator = comparator; | |
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(omap_usb2_set_comparator); | |
54 | ||
55 | /** | |
56 | * omap_usb_phy_power - power on/off the phy using control module reg | |
57 | * @phy: struct omap_usb * | |
58 | * @on: 0 or 1, based on powering on or off the PHY | |
59 | * | |
60 | * XXX: Remove this function once control module driver gets merged | |
61 | */ | |
62 | static void omap_usb_phy_power(struct omap_usb *phy, int on) | |
63 | { | |
64 | u32 val; | |
65 | ||
66 | if (on) { | |
67 | val = readl(phy->control_dev); | |
68 | if (val & PHY_PD) { | |
69 | writel(~PHY_PD, phy->control_dev); | |
70 | /* XXX: add proper documentation for this delay */ | |
71 | mdelay(200); | |
72 | } | |
73 | } else { | |
74 | writel(PHY_PD, phy->control_dev); | |
75 | } | |
76 | } | |
77 | ||
78 | static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled) | |
79 | { | |
80 | struct omap_usb *phy = phy_to_omapusb(otg->phy); | |
81 | ||
82 | if (!phy->comparator) | |
83 | return -ENODEV; | |
84 | ||
85 | return phy->comparator->set_vbus(phy->comparator, enabled); | |
86 | } | |
87 | ||
88 | static int omap_usb_start_srp(struct usb_otg *otg) | |
89 | { | |
90 | struct omap_usb *phy = phy_to_omapusb(otg->phy); | |
91 | ||
92 | if (!phy->comparator) | |
93 | return -ENODEV; | |
94 | ||
95 | return phy->comparator->start_srp(phy->comparator); | |
96 | } | |
97 | ||
98 | static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host) | |
99 | { | |
100 | struct usb_phy *phy = otg->phy; | |
101 | ||
102 | otg->host = host; | |
103 | if (!host) | |
104 | phy->state = OTG_STATE_UNDEFINED; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int omap_usb_set_peripheral(struct usb_otg *otg, | |
110 | struct usb_gadget *gadget) | |
111 | { | |
112 | struct usb_phy *phy = otg->phy; | |
113 | ||
114 | otg->gadget = gadget; | |
115 | if (!gadget) | |
116 | phy->state = OTG_STATE_UNDEFINED; | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int omap_usb2_suspend(struct usb_phy *x, int suspend) | |
122 | { | |
123 | u32 ret; | |
124 | struct omap_usb *phy = phy_to_omapusb(x); | |
125 | ||
126 | if (suspend && !phy->is_suspended) { | |
127 | omap_usb_phy_power(phy, 0); | |
128 | pm_runtime_put_sync(phy->dev); | |
129 | phy->is_suspended = 1; | |
130 | } else if (!suspend && phy->is_suspended) { | |
131 | ret = pm_runtime_get_sync(phy->dev); | |
132 | if (ret < 0) { | |
133 | dev_err(phy->dev, "get_sync failed with err %d\n", | |
134 | ret); | |
135 | return ret; | |
136 | } | |
137 | omap_usb_phy_power(phy, 1); | |
138 | phy->is_suspended = 0; | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
41ac7b3a | 144 | static int omap_usb2_probe(struct platform_device *pdev) |
657b306a KVA |
145 | { |
146 | struct omap_usb *phy; | |
147 | struct usb_otg *otg; | |
148 | struct resource *res; | |
149 | ||
150 | phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); | |
151 | if (!phy) { | |
152 | dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n"); | |
153 | return -ENOMEM; | |
154 | } | |
155 | ||
156 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); | |
157 | if (!otg) { | |
158 | dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n"); | |
159 | return -ENOMEM; | |
160 | } | |
161 | ||
162 | phy->dev = &pdev->dev; | |
163 | ||
164 | phy->phy.dev = phy->dev; | |
165 | phy->phy.label = "omap-usb2"; | |
166 | phy->phy.set_suspend = omap_usb2_suspend; | |
167 | phy->phy.otg = otg; | |
168 | ||
169 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
170 | ||
171 | phy->control_dev = devm_request_and_ioremap(&pdev->dev, res); | |
172 | if (phy->control_dev == NULL) { | |
173 | dev_err(&pdev->dev, "Failed to obtain io memory\n"); | |
174 | return -ENXIO; | |
175 | } | |
176 | ||
177 | phy->is_suspended = 1; | |
178 | omap_usb_phy_power(phy, 0); | |
179 | ||
180 | otg->set_host = omap_usb_set_host; | |
181 | otg->set_peripheral = omap_usb_set_peripheral; | |
182 | otg->set_vbus = omap_usb_set_vbus; | |
183 | otg->start_srp = omap_usb_start_srp; | |
184 | otg->phy = &phy->phy; | |
185 | ||
186 | phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); | |
187 | if (IS_ERR(phy->wkupclk)) { | |
188 | dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); | |
189 | return PTR_ERR(phy->wkupclk); | |
190 | } | |
191 | clk_prepare(phy->wkupclk); | |
192 | ||
193 | usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2); | |
194 | ||
195 | platform_set_drvdata(pdev, phy); | |
196 | ||
197 | pm_runtime_enable(phy->dev); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static int __devexit omap_usb2_remove(struct platform_device *pdev) | |
203 | { | |
204 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
205 | ||
206 | clk_unprepare(phy->wkupclk); | |
207 | usb_remove_phy(&phy->phy); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | #ifdef CONFIG_PM_RUNTIME | |
213 | ||
214 | static int omap_usb2_runtime_suspend(struct device *dev) | |
215 | { | |
216 | struct platform_device *pdev = to_platform_device(dev); | |
217 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
218 | ||
219 | clk_disable(phy->wkupclk); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int omap_usb2_runtime_resume(struct device *dev) | |
225 | { | |
226 | u32 ret = 0; | |
227 | struct platform_device *pdev = to_platform_device(dev); | |
228 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
229 | ||
230 | ret = clk_enable(phy->wkupclk); | |
231 | if (ret < 0) | |
232 | dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
237 | static const struct dev_pm_ops omap_usb2_pm_ops = { | |
238 | SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, | |
239 | NULL) | |
240 | }; | |
241 | ||
242 | #define DEV_PM_OPS (&omap_usb2_pm_ops) | |
243 | #else | |
244 | #define DEV_PM_OPS NULL | |
245 | #endif | |
246 | ||
247 | #ifdef CONFIG_OF | |
248 | static const struct of_device_id omap_usb2_id_table[] = { | |
249 | { .compatible = "ti,omap-usb2" }, | |
250 | {} | |
251 | }; | |
252 | MODULE_DEVICE_TABLE(of, omap_usb2_id_table); | |
253 | #endif | |
254 | ||
255 | static struct platform_driver omap_usb2_driver = { | |
256 | .probe = omap_usb2_probe, | |
7690417d | 257 | .remove = omap_usb2_remove, |
657b306a KVA |
258 | .driver = { |
259 | .name = "omap-usb2", | |
260 | .owner = THIS_MODULE, | |
261 | .pm = DEV_PM_OPS, | |
262 | .of_match_table = of_match_ptr(omap_usb2_id_table), | |
263 | }, | |
264 | }; | |
265 | ||
266 | module_platform_driver(omap_usb2_driver); | |
267 | ||
268 | MODULE_ALIAS("platform: omap_usb2"); | |
269 | MODULE_AUTHOR("Texas Instruments Inc."); | |
270 | MODULE_DESCRIPTION("OMAP USB2 phy driver"); | |
271 | MODULE_LICENSE("GPL v2"); |