1 // SPDX-License-Identifier: GPL-2.0
3  * mtu3_dr.c - dual role switch and host glue layer
24 	if (!ssusb->otg_switch.is_u3_drd) {  in toggle_opstate()
25 		mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);  in toggle_opstate()
26 		mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);  in toggle_opstate()
30 /* only port0 supports dual-role mode */
34 	void __iomem *ibase = ssusb->ippc_base;  in ssusb_port0_switch()
37 	dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,  in ssusb_port0_switch()
41 		/* 1. power off and disable u2 port0 */  in ssusb_port0_switch()
46 		/* 2. power on, enable u2 port0 and select its mode */  in ssusb_port0_switch()
53 		/* 1. power off and disable u3 port0 */  in ssusb_port0_switch()
58 		/* 2. power on, enable u3 port0 and select its mode */  in ssusb_port0_switch()
73 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_host()
77 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_host()
92 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_device()
96 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_device()
107 	struct regulator *vbus = otg_sx->vbus;  in ssusb_set_vbus()
114 	dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");  in ssusb_set_vbus()
119 			dev_err(ssusb->dev, "vbus regulator enable failed\n");  in ssusb_set_vbus()
134 	struct mtu3 *mtu = ssusb->u3d;  in ssusb_mode_sw_work()
135 	enum usb_role desired_role = otg_sx->desired_role;  in ssusb_mode_sw_work()
138 	current_role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;  in ssusb_mode_sw_work()
143 		if (otg_sx->default_role == USB_ROLE_DEVICE)  in ssusb_mode_sw_work()
150 	dev_dbg(ssusb->dev, "set role : %s\n", usb_role_string(desired_role));  in ssusb_mode_sw_work()
151 	mtu3_dbg_trace(ssusb->dev, "set role : %s", usb_role_string(desired_role));  in ssusb_mode_sw_work()
152 	pm_runtime_get_sync(ssusb->dev);  in ssusb_mode_sw_work()
160 		ssusb->is_host = true;  in ssusb_mode_sw_work()
164 		ssusb->is_host = false;  in ssusb_mode_sw_work()
171 		dev_err(ssusb->dev, "invalid role\n");  in ssusb_mode_sw_work()
173 	pm_runtime_put(ssusb->dev);  in ssusb_mode_sw_work()
176 static void ssusb_set_mode(struct otg_switch_mtk *otg_sx, enum usb_role role)  in ssusb_set_mode()  argument
180 	if (ssusb->dr_mode != USB_DR_MODE_OTG)  in ssusb_set_mode()
183 	otg_sx->desired_role = role;  in ssusb_set_mode()
184 	queue_work(system_freezable_wq, &otg_sx->dr_work);  in ssusb_set_mode()
201 	struct extcon_dev *edev = otg_sx->edev;  in ssusb_extcon_register()
208 	otg_sx->id_nb.notifier_call = ssusb_id_notifier;  in ssusb_extcon_register()
209 	ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,  in ssusb_extcon_register()
210 					&otg_sx->id_nb);  in ssusb_extcon_register()
212 		dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");  in ssusb_extcon_register()
217 	dev_dbg(ssusb->dev, "EXTCON_USB_HOST: %d\n", ret);  in ssusb_extcon_register()
229  * This is useful in special cases, such as uses TYPE-A receptacle but also
230  * wants to support dual-role mode.
234 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_mode_switch()
244 	value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));  in ssusb_set_force_mode()
259 	mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);  in ssusb_set_force_mode()
262 static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)  in ssusb_role_sw_set()  argument
265 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_role_sw_set()
267 	ssusb_set_mode(otg_sx, role);  in ssusb_role_sw_set()
276 	return ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;  in ssusb_role_sw_get()
283 	struct device *dev = ssusb->dev;  in ssusb_role_sw_register()
286 	if (!otg_sx->role_sw_used)  in ssusb_role_sw_register()
291 		otg_sx->default_role = USB_ROLE_DEVICE;  in ssusb_role_sw_register()
293 		otg_sx->default_role = USB_ROLE_HOST;  in ssusb_role_sw_register()
299 	otg_sx->role_sw = usb_role_switch_register(dev, &role_sx_desc);  in ssusb_role_sw_register()
300 	if (IS_ERR(otg_sx->role_sw))  in ssusb_role_sw_register()
301 		return PTR_ERR(otg_sx->role_sw);  in ssusb_role_sw_register()
303 	ssusb_set_mode(otg_sx, otg_sx->default_role);  in ssusb_role_sw_register()
310 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_init()
313 	INIT_WORK(&otg_sx->dr_work, ssusb_mode_sw_work);  in ssusb_otg_switch_init()
315 	if (otg_sx->manual_drd_enabled)  in ssusb_otg_switch_init()
317 	else if (otg_sx->role_sw_used)  in ssusb_otg_switch_init()
327 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_exit()
329 	cancel_work_sync(&otg_sx->dr_work);  in ssusb_otg_switch_exit()
330 	usb_role_switch_unregister(otg_sx->role_sw);  in ssusb_otg_switch_exit()