1 // SPDX-License-Identifier: GPL-2.0
3  * mtu3_dr.c - dual role switch and host glue layer
24 	mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);  in toggle_opstate()
25 	mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);  in toggle_opstate()
28 /* only port0 supports dual-role mode */
32 	void __iomem *ibase = ssusb->ippc_base;  in ssusb_port0_switch()
35 	dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,  in ssusb_port0_switch()
44 		/* 2. power on, enable u2 port0 and select its mode */  in ssusb_port0_switch()
56 		/* 2. power on, enable u3 port0 and select its mode */  in ssusb_port0_switch()
71 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_host()
75 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_host()
90 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_device()
94 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_device()
105 	struct regulator *vbus = otg_sx->vbus;  in ssusb_set_vbus()
112 	dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");  in ssusb_set_vbus()
117 			dev_err(ssusb->dev, "vbus regulator enable failed\n");  in ssusb_set_vbus()
132 	struct mtu3 *mtu = ssusb->u3d;  in ssusb_mode_sw_work()
133 	enum usb_role desired_role = otg_sx->desired_role;  in ssusb_mode_sw_work()
136 	current_role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;  in ssusb_mode_sw_work()
139 		/* the default mode is host as probe does */  in ssusb_mode_sw_work()
141 		if (otg_sx->default_role == USB_ROLE_DEVICE)  in ssusb_mode_sw_work()
148 	dev_dbg(ssusb->dev, "set role : %s\n", usb_role_string(desired_role));  in ssusb_mode_sw_work()
149 	mtu3_dbg_trace(ssusb->dev, "set role : %s", usb_role_string(desired_role));  in ssusb_mode_sw_work()
150 	pm_runtime_get_sync(ssusb->dev);  in ssusb_mode_sw_work()
152 	switch (desired_role) {  in ssusb_mode_sw_work()
158 		ssusb->is_host = true;  in ssusb_mode_sw_work()
162 		ssusb->is_host = false;  in ssusb_mode_sw_work()
168 	default:  in ssusb_mode_sw_work()
169 		dev_err(ssusb->dev, "invalid role\n");  in ssusb_mode_sw_work()
171 	pm_runtime_put(ssusb->dev);  in ssusb_mode_sw_work()
174 static void ssusb_set_mode(struct otg_switch_mtk *otg_sx, enum usb_role role)  in ssusb_set_mode()  argument
178 	if (ssusb->dr_mode != USB_DR_MODE_OTG)  in ssusb_set_mode()
181 	otg_sx->desired_role = role;  in ssusb_set_mode()
182 	queue_work(system_freezable_wq, &otg_sx->dr_work);  in ssusb_set_mode()
199 	struct extcon_dev *edev = otg_sx->edev;  in ssusb_extcon_register()
206 	otg_sx->id_nb.notifier_call = ssusb_id_notifier;  in ssusb_extcon_register()
207 	ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,  in ssusb_extcon_register()
208 					&otg_sx->id_nb);  in ssusb_extcon_register()
210 		dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");  in ssusb_extcon_register()
215 	dev_dbg(ssusb->dev, "EXTCON_USB_HOST: %d\n", ret);  in ssusb_extcon_register()
217 	/* default as host, switch to device mode if needed */  in ssusb_extcon_register()
225  * We provide an interface via debugfs to switch between host and device modes
227  * This is useful in special cases, such as uses TYPE-A receptacle but also
228  * wants to support dual-role mode.
232 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_mode_switch()
238 			  enum mtu3_dr_force_mode mode)  in ssusb_set_force_mode()  argument
242 	value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));  in ssusb_set_force_mode()
243 	switch (mode) {  in ssusb_set_force_mode()
254 	default:  in ssusb_set_force_mode()
257 	mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);  in ssusb_set_force_mode()
260 static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)  in ssusb_role_sw_set()  argument
263 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_role_sw_set()
265 	ssusb_set_mode(otg_sx, role);  in ssusb_role_sw_set()
274 	return ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;  in ssusb_role_sw_get()
281 	struct device *dev = ssusb->dev;  in ssusb_role_sw_register()
282 	enum usb_dr_mode mode;  in ssusb_role_sw_register()  local
284 	if (!otg_sx->role_sw_used)  in ssusb_role_sw_register()
287 	mode = usb_get_role_switch_default_mode(dev);  in ssusb_role_sw_register()
288 	if (mode == USB_DR_MODE_PERIPHERAL)  in ssusb_role_sw_register()
289 		otg_sx->default_role = USB_ROLE_DEVICE;  in ssusb_role_sw_register()
291 		otg_sx->default_role = USB_ROLE_HOST;  in ssusb_role_sw_register()
298 	otg_sx->role_sw = usb_role_switch_register(dev, &role_sx_desc);  in ssusb_role_sw_register()
299 	if (IS_ERR(otg_sx->role_sw))  in ssusb_role_sw_register()
300 		return PTR_ERR(otg_sx->role_sw);  in ssusb_role_sw_register()
302 	ssusb_set_mode(otg_sx, otg_sx->default_role);  in ssusb_role_sw_register()
309 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_init()
312 	INIT_WORK(&otg_sx->dr_work, ssusb_mode_sw_work);  in ssusb_otg_switch_init()
314 	if (otg_sx->manual_drd_enabled)  in ssusb_otg_switch_init()
316 	else if (otg_sx->role_sw_used)  in ssusb_otg_switch_init()
326 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_exit()
328 	cancel_work_sync(&otg_sx->dr_work);  in ssusb_otg_switch_exit()
329 	usb_role_switch_unregister(otg_sx->role_sw);  in ssusb_otg_switch_exit()