1 // SPDX-License-Identifier: GPL-2.0
3  * drd.c - DesignWare USB2 DRD Controller Dual-role support
12 #include <linux/usb/role.h>
20 	spin_lock_irqsave(&hsotg->lock, flags);  in dwc2_ovr_init()
30 	spin_unlock_irqrestore(&hsotg->lock, flags);  in dwc2_ovr_init()
37 	/* Check if A-Session is already in the right state */  in dwc2_ovr_avalid()
40 		return -EALREADY;  in dwc2_ovr_avalid()
55 	/* Check if B-Session is already in the right state */  in dwc2_ovr_bvalid()
58 		return -EALREADY;  in dwc2_ovr_bvalid()
69 static int dwc2_drd_role_sw_set(struct usb_role_switch *sw, enum usb_role role)  in dwc2_drd_role_sw_set()  argument
76 	if ((role == USB_ROLE_DEVICE && hsotg->dr_mode == USB_DR_MODE_HOST) ||  in dwc2_drd_role_sw_set()
77 	    (role == USB_ROLE_HOST && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))  in dwc2_drd_role_sw_set()
78 		return -EINVAL;  in dwc2_drd_role_sw_set()
83 	if (role == USB_ROLE_NONE && hsotg->test_mode) {  in dwc2_drd_role_sw_set()
84 		dev_dbg(hsotg->dev, "Core is in test mode\n");  in dwc2_drd_role_sw_set()
85 		return -EBUSY;  in dwc2_drd_role_sw_set()
89 	spin_lock_irqsave(&hsotg->lock, flags);  in dwc2_drd_role_sw_set()
91 	if (role == USB_ROLE_HOST) {  in dwc2_drd_role_sw_set()
93 	} else if (role == USB_ROLE_DEVICE) {  in dwc2_drd_role_sw_set()
107 	spin_unlock_irqrestore(&hsotg->lock, flags);  in dwc2_drd_role_sw_set()
109 	if (!already && hsotg->dr_mode == USB_DR_MODE_OTG)  in dwc2_drd_role_sw_set()
111 		dwc2_force_mode(hsotg, role == USB_ROLE_HOST);  in dwc2_drd_role_sw_set()
113 	dev_dbg(hsotg->dev, "%s-session valid\n",  in dwc2_drd_role_sw_set()
114 		role == USB_ROLE_NONE ? "No" :  in dwc2_drd_role_sw_set()
115 		role == USB_ROLE_HOST ? "A" : "B");  in dwc2_drd_role_sw_set()
126 	if (!device_property_read_bool(hsotg->dev, "usb-role-switch"))  in dwc2_drd_init()
130 	role_sw_desc.fwnode = dev_fwnode(hsotg->dev);  in dwc2_drd_init()
134 	role_sw = usb_role_switch_register(hsotg->dev, &role_sw_desc);  in dwc2_drd_init()
137 		dev_err(hsotg->dev,  in dwc2_drd_init()
138 			"failed to register role switch: %d\n", ret);  in dwc2_drd_init()
142 	hsotg->role_sw = role_sw;  in dwc2_drd_init()
154 	if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) {  in dwc2_drd_suspend()
167 	if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) {  in dwc2_drd_resume()
178 	if (hsotg->role_sw)  in dwc2_drd_exit()
179 		usb_role_switch_unregister(hsotg->role_sw);  in dwc2_drd_exit()