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>
31 #include <linux/phy/phy.h>
32 #include <linux/of_platform.h>
35 * omap_usb2_set_comparator - links the comparator present in the sytem with
37 * @comparator - the companion phy(comparator) for this phy
39 * The phy companion driver should call this API passing the phy_companion
40 * filled with set_vbus and start_srp to be used by usb phy.
42 * For use by phy companion driver
44 int omap_usb2_set_comparator(struct phy_companion
*comparator
)
47 struct usb_phy
*x
= usb_get_phy(USB_PHY_TYPE_USB2
);
52 phy
= phy_to_omapusb(x
);
53 phy
->comparator
= comparator
;
56 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator
);
58 static int omap_usb_set_vbus(struct usb_otg
*otg
, bool enabled
)
60 struct omap_usb
*phy
= phy_to_omapusb(otg
->phy
);
65 return phy
->comparator
->set_vbus(phy
->comparator
, enabled
);
68 static int omap_usb_start_srp(struct usb_otg
*otg
)
70 struct omap_usb
*phy
= phy_to_omapusb(otg
->phy
);
75 return phy
->comparator
->start_srp(phy
->comparator
);
78 static int omap_usb_set_host(struct usb_otg
*otg
, struct usb_bus
*host
)
80 struct usb_phy
*phy
= otg
->phy
;
84 phy
->state
= OTG_STATE_UNDEFINED
;
89 static int omap_usb_set_peripheral(struct usb_otg
*otg
,
90 struct usb_gadget
*gadget
)
92 struct usb_phy
*phy
= otg
->phy
;
96 phy
->state
= OTG_STATE_UNDEFINED
;
101 static int omap_usb2_suspend(struct usb_phy
*x
, int suspend
)
103 struct omap_usb
*phy
= phy_to_omapusb(x
);
106 if (suspend
&& !phy
->is_suspended
) {
107 omap_control_usb_phy_power(phy
->control_dev
, 0);
108 pm_runtime_put_sync(phy
->dev
);
109 phy
->is_suspended
= 1;
110 } else if (!suspend
&& phy
->is_suspended
) {
111 ret
= pm_runtime_get_sync(phy
->dev
);
113 dev_err(phy
->dev
, "get_sync failed with err %d\n", ret
);
116 omap_control_usb_phy_power(phy
->control_dev
, 1);
117 phy
->is_suspended
= 0;
123 static int omap_usb_power_off(struct phy
*x
)
125 struct omap_usb
*phy
= phy_get_drvdata(x
);
127 omap_control_usb_phy_power(phy
->control_dev
, 0);
132 static int omap_usb_power_on(struct phy
*x
)
134 struct omap_usb
*phy
= phy_get_drvdata(x
);
136 omap_control_usb_phy_power(phy
->control_dev
, 1);
141 static struct phy_ops ops
= {
142 .power_on
= omap_usb_power_on
,
143 .power_off
= omap_usb_power_off
,
144 .owner
= THIS_MODULE
,
147 static int omap_usb2_probe(struct platform_device
*pdev
)
149 struct omap_usb
*phy
;
150 struct phy
*generic_phy
;
151 struct phy_provider
*phy_provider
;
153 struct device_node
*node
= pdev
->dev
.of_node
;
154 struct device_node
*control_node
;
155 struct platform_device
*control_pdev
;
160 phy
= devm_kzalloc(&pdev
->dev
, sizeof(*phy
), GFP_KERNEL
);
162 dev_err(&pdev
->dev
, "unable to allocate memory for USB2 PHY\n");
166 otg
= devm_kzalloc(&pdev
->dev
, sizeof(*otg
), GFP_KERNEL
);
168 dev_err(&pdev
->dev
, "unable to allocate memory for USB OTG\n");
172 phy
->dev
= &pdev
->dev
;
174 phy
->phy
.dev
= phy
->dev
;
175 phy
->phy
.label
= "omap-usb2";
176 phy
->phy
.set_suspend
= omap_usb2_suspend
;
178 phy
->phy
.type
= USB_PHY_TYPE_USB2
;
180 phy_provider
= devm_of_phy_provider_register(phy
->dev
,
181 of_phy_simple_xlate
);
182 if (IS_ERR(phy_provider
))
183 return PTR_ERR(phy_provider
);
185 control_node
= of_parse_phandle(node
, "ctrl-module", 0);
187 dev_err(&pdev
->dev
, "Failed to get control device phandle\n");
191 control_pdev
= of_find_device_by_node(control_node
);
193 dev_err(&pdev
->dev
, "Failed to get control device\n");
197 phy
->control_dev
= &control_pdev
->dev
;
199 phy
->is_suspended
= 1;
200 omap_control_usb_phy_power(phy
->control_dev
, 0);
202 otg
->set_host
= omap_usb_set_host
;
203 otg
->set_peripheral
= omap_usb_set_peripheral
;
204 otg
->set_vbus
= omap_usb_set_vbus
;
205 otg
->start_srp
= omap_usb_start_srp
;
206 otg
->phy
= &phy
->phy
;
208 platform_set_drvdata(pdev
, phy
);
209 pm_runtime_enable(phy
->dev
);
211 generic_phy
= devm_phy_create(phy
->dev
, &ops
, NULL
);
212 if (IS_ERR(generic_phy
))
213 return PTR_ERR(generic_phy
);
215 phy_set_drvdata(generic_phy
, phy
);
217 phy
->wkupclk
= devm_clk_get(phy
->dev
, "usb_phy_cm_clk32k");
218 if (IS_ERR(phy
->wkupclk
)) {
219 dev_err(&pdev
->dev
, "unable to get usb_phy_cm_clk32k\n");
220 return PTR_ERR(phy
->wkupclk
);
222 clk_prepare(phy
->wkupclk
);
224 phy
->optclk
= devm_clk_get(phy
->dev
, "usb_otg_ss_refclk960m");
225 if (IS_ERR(phy
->optclk
))
226 dev_vdbg(&pdev
->dev
, "unable to get refclk960m\n");
228 clk_prepare(phy
->optclk
);
230 usb_add_phy_dev(&phy
->phy
);
235 static int omap_usb2_remove(struct platform_device
*pdev
)
237 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
239 clk_unprepare(phy
->wkupclk
);
240 if (!IS_ERR(phy
->optclk
))
241 clk_unprepare(phy
->optclk
);
242 usb_remove_phy(&phy
->phy
);
247 #ifdef CONFIG_PM_RUNTIME
249 static int omap_usb2_runtime_suspend(struct device
*dev
)
251 struct platform_device
*pdev
= to_platform_device(dev
);
252 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
254 clk_disable(phy
->wkupclk
);
255 if (!IS_ERR(phy
->optclk
))
256 clk_disable(phy
->optclk
);
261 static int omap_usb2_runtime_resume(struct device
*dev
)
263 struct platform_device
*pdev
= to_platform_device(dev
);
264 struct omap_usb
*phy
= platform_get_drvdata(pdev
);
267 ret
= clk_enable(phy
->wkupclk
);
269 dev_err(phy
->dev
, "Failed to enable wkupclk %d\n", ret
);
273 if (!IS_ERR(phy
->optclk
)) {
274 ret
= clk_enable(phy
->optclk
);
276 dev_err(phy
->dev
, "Failed to enable optclk %d\n", ret
);
284 clk_disable(phy
->wkupclk
);
290 static const struct dev_pm_ops omap_usb2_pm_ops
= {
291 SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend
, omap_usb2_runtime_resume
,
295 #define DEV_PM_OPS (&omap_usb2_pm_ops)
297 #define DEV_PM_OPS NULL
301 static const struct of_device_id omap_usb2_id_table
[] = {
302 { .compatible
= "ti,omap-usb2" },
305 MODULE_DEVICE_TABLE(of
, omap_usb2_id_table
);
308 static struct platform_driver omap_usb2_driver
= {
309 .probe
= omap_usb2_probe
,
310 .remove
= omap_usb2_remove
,
313 .owner
= THIS_MODULE
,
315 .of_match_table
= of_match_ptr(omap_usb2_id_table
),
319 module_platform_driver(omap_usb2_driver
);
321 MODULE_ALIAS("platform: omap_usb2");
322 MODULE_AUTHOR("Texas Instruments Inc.");
323 MODULE_DESCRIPTION("OMAP USB2 phy driver");
324 MODULE_LICENSE("GPL v2");