2 * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
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.
10 * Author: Kishon Vijay Abraham I <kishon@ti.com>
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.
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.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 #include <linux/usb/omap_control_usb.h>
33 * omap_usb2_set_comparator - links the comparator present in the sytem with
35 * @comparator - the companion phy(comparator) for this phy
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.
40 * For use by phy companion driver
42 int omap_usb2_set_comparator(struct phy_companion *comparator)
45 struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);
50 phy = phy_to_omapusb(x);
51 phy->comparator = comparator;
54 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
56 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
58 struct omap_usb *phy = phy_to_omapusb(otg->phy);
63 return phy->comparator->set_vbus(phy->comparator, enabled);
66 static int omap_usb_start_srp(struct usb_otg *otg)
68 struct omap_usb *phy = phy_to_omapusb(otg->phy);
73 return phy->comparator->start_srp(phy->comparator);
76 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
78 struct usb_phy *phy = otg->phy;
82 phy->state = OTG_STATE_UNDEFINED;
87 static int omap_usb_set_peripheral(struct usb_otg *otg,
88 struct usb_gadget *gadget)
90 struct usb_phy *phy = otg->phy;
94 phy->state = OTG_STATE_UNDEFINED;
99 static int omap_usb2_suspend(struct usb_phy *x, int suspend)
101 struct omap_usb *phy = phy_to_omapusb(x);
104 if (suspend && !phy->is_suspended) {
105 omap_control_usb_phy_power(phy->control_dev, 0);
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);
111 dev_err(phy->dev, "get_sync failed with err %d\n", ret);
114 omap_control_usb_phy_power(phy->control_dev, 1);
115 phy->is_suspended = 0;
121 static int omap_usb2_probe(struct platform_device *pdev)
123 struct omap_usb *phy;
126 phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
128 dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
132 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
134 dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
138 phy->dev = &pdev->dev;
140 phy->phy.dev = phy->dev;
141 phy->phy.label = "omap-usb2";
142 phy->phy.set_suspend = omap_usb2_suspend;
144 phy->phy.type = USB_PHY_TYPE_USB2;
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");
152 phy->is_suspended = 1;
153 omap_control_usb_phy_power(phy->control_dev, 0);
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;
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);
166 clk_prepare(phy->wkupclk);
168 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
169 if (IS_ERR(phy->optclk))
170 dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
172 clk_prepare(phy->optclk);
174 usb_add_phy_dev(&phy->phy);
176 platform_set_drvdata(pdev, phy);
178 pm_runtime_enable(phy->dev);
183 static int omap_usb2_remove(struct platform_device *pdev)
185 struct omap_usb *phy = platform_get_drvdata(pdev);
187 clk_unprepare(phy->wkupclk);
188 if (!IS_ERR(phy->optclk))
189 clk_unprepare(phy->optclk);
190 usb_remove_phy(&phy->phy);
195 #ifdef CONFIG_PM_RUNTIME
197 static int omap_usb2_runtime_suspend(struct device *dev)
199 struct platform_device *pdev = to_platform_device(dev);
200 struct omap_usb *phy = platform_get_drvdata(pdev);
202 clk_disable(phy->wkupclk);
203 if (!IS_ERR(phy->optclk))
204 clk_disable(phy->optclk);
209 static int omap_usb2_runtime_resume(struct device *dev)
211 struct platform_device *pdev = to_platform_device(dev);
212 struct omap_usb *phy = platform_get_drvdata(pdev);
215 ret = clk_enable(phy->wkupclk);
217 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
221 if (!IS_ERR(phy->optclk)) {
222 ret = clk_enable(phy->optclk);
224 dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
232 clk_disable(phy->wkupclk);
238 static const struct dev_pm_ops omap_usb2_pm_ops = {
239 SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
243 #define DEV_PM_OPS (&omap_usb2_pm_ops)
245 #define DEV_PM_OPS NULL
249 static const struct of_device_id omap_usb2_id_table[] = {
250 { .compatible = "ti,omap-usb2" },
253 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
256 static struct platform_driver omap_usb2_driver = {
257 .probe = omap_usb2_probe,
258 .remove = omap_usb2_remove,
261 .owner = THIS_MODULE,
263 .of_match_table = of_match_ptr(omap_usb2_id_table),
267 module_platform_driver(omap_usb2_driver);
269 MODULE_ALIAS("platform: omap_usb2");
270 MODULE_AUTHOR("Texas Instruments Inc.");
271 MODULE_DESCRIPTION("OMAP USB2 phy driver");
272 MODULE_LICENSE("GPL v2");