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
)
102 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",
115 omap_control_usb_phy_power(phy
->control_dev
, 1);
116 phy
->is_suspended
= 0;
122 static int omap_usb2_probe(struct platform_device
*pdev
)
124 struct omap_usb
*phy
;
127 phy
= devm_kzalloc(&pdev
->dev
, sizeof(*phy
), GFP_KERNEL
);
129 dev_err(&pdev
->dev
, "unable to allocate memory for USB2 PHY\n");
133 otg
= devm_kzalloc(&pdev
->dev
, sizeof(*otg
), GFP_KERNEL
);
135 dev_err(&pdev
->dev
, "unable to allocate memory for USB OTG\n");
139 phy
->dev
= &pdev
->dev
;
141 phy
->phy
.dev
= phy
->dev
;
142 phy
->phy
.label
= "omap-usb2";
143 phy
->phy
.set_suspend
= omap_usb2_suspend
;
145 phy
->phy
.type
= USB_PHY_TYPE_USB2
;
147 phy
->control_dev
= omap_get_control_dev();
148 if (IS_ERR(phy
->control_dev
)) {
149 dev_dbg(&pdev
->dev
, "Failed to get control device\n");
153 phy
->is_suspended
= 1;
154 omap_control_usb_phy_power(phy
->control_dev
, 0);
156 otg
->set_host
= omap_usb_set_host
;
157 otg
->set_peripheral
= omap_usb_set_peripheral
;
158 otg
->set_vbus
= omap_usb_set_vbus
;
159 otg
->start_srp
= omap_usb_start_srp
;
160 otg
->phy
= &phy
->phy
;
162 phy
->wkupclk
= devm_clk_get(phy
->dev
, "usb_phy_cm_clk32k");
163 if (IS_ERR(phy
->wkupclk
)) {
164 dev_err(&pdev
->dev
, "unable to get usb_phy_cm_clk32k\n");
165 return PTR_ERR(phy
->wkupclk
);
167 clk_prepare(phy
->wkupclk
);
169 phy
->optclk
= devm_clk_get(phy
->dev
, "usb_otg_ss_refclk960m");
170 if (IS_ERR(phy
->optclk
))
171 dev_vdbg(&pdev
->dev
, "unable to get refclk960m\n");
173 clk_prepare(phy
->optclk
);
175 usb_add_phy_dev(&phy
->phy
);
177 platform_set_drvdata(pdev
, phy
);
179 pm_runtime_enable(phy
->dev
);
184 static int omap_usb2_remove(struct platform_device
*pdev
)
186 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
188 clk_unprepare(phy
->wkupclk
);
189 if (!IS_ERR(phy
->optclk
))
190 clk_unprepare(phy
->optclk
);
191 usb_remove_phy(&phy
->phy
);
196 #ifdef CONFIG_PM_RUNTIME
198 static int omap_usb2_runtime_suspend(struct device
*dev
)
200 struct platform_device
*pdev
= to_platform_device(dev
);
201 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
203 clk_disable(phy
->wkupclk
);
204 if (!IS_ERR(phy
->optclk
))
205 clk_disable(phy
->optclk
);
210 static int omap_usb2_runtime_resume(struct device
*dev
)
213 struct platform_device
*pdev
= to_platform_device(dev
);
214 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
216 ret
= clk_enable(phy
->wkupclk
);
218 dev_err(phy
->dev
, "Failed to enable wkupclk %d\n", ret
);
222 if (!IS_ERR(phy
->optclk
)) {
223 ret
= clk_enable(phy
->optclk
);
225 dev_err(phy
->dev
, "Failed to enable optclk %d\n", ret
);
233 clk_disable(phy
->wkupclk
);
239 static const struct dev_pm_ops omap_usb2_pm_ops
= {
240 SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend
, omap_usb2_runtime_resume
,
244 #define DEV_PM_OPS (&omap_usb2_pm_ops)
246 #define DEV_PM_OPS NULL
250 static const struct of_device_id omap_usb2_id_table
[] = {
251 { .compatible
= "ti,omap-usb2" },
254 MODULE_DEVICE_TABLE(of
, omap_usb2_id_table
);
257 static struct platform_driver omap_usb2_driver
= {
258 .probe
= omap_usb2_probe
,
259 .remove
= omap_usb2_remove
,
262 .owner
= THIS_MODULE
,
264 .of_match_table
= of_match_ptr(omap_usb2_id_table
),
268 module_platform_driver(omap_usb2_driver
);
270 MODULE_ALIAS("platform: omap_usb2");
271 MODULE_AUTHOR("Texas Instruments Inc.");
272 MODULE_DESCRIPTION("OMAP USB2 phy driver");
273 MODULE_LICENSE("GPL v2");