1 // SPDX-License-Identifier: GPL-2.0
3  * mtu3_dr.c - dual role switch and host glue layer
10 #include <linux/usb/role.h>
44 	if (!ssusb->otg_switch.is_u3_drd) {  in toggle_opstate()
45 		mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);  in toggle_opstate()
46 		mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);  in toggle_opstate()
50 /* only port0 supports dual-role mode */
54 	void __iomem *ibase = ssusb->ippc_base;  in ssusb_port0_switch()
57 	dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,  in ssusb_port0_switch()
61 		/* 1. power off and disable u2 port0 */  in ssusb_port0_switch()
66 		/* 2. power on, enable u2 port0 and select its mode */  in ssusb_port0_switch()
73 		/* 1. power off and disable u3 port0 */  in ssusb_port0_switch()
78 		/* 2. power on, enable u3 port0 and select its mode */  in ssusb_port0_switch()
93 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_host()
97 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_host()
112 	dev_dbg(ssusb->dev, "%s\n", __func__);  in switch_port_to_device()
116 	if (ssusb->otg_switch.is_u3_drd) {  in switch_port_to_device()
128 	struct regulator *vbus = otg_sx->vbus;  in ssusb_set_vbus()
135 	dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");  in ssusb_set_vbus()
140 			dev_err(ssusb->dev, "vbus regulator enable failed\n");  in ssusb_set_vbus()
151  * switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND
152  * switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID
159 	struct mtu3 *mtu = ssusb->u3d;  in ssusb_set_mailbox()
161 	dev_dbg(ssusb->dev, "mailbox %s\n", mailbox_state_string(status));  in ssusb_set_mailbox()
162 	mtu3_dbg_trace(ssusb->dev, "mailbox %s", mailbox_state_string(status));  in ssusb_set_mailbox()
168 		ssusb->is_host = true;  in ssusb_set_mailbox()
171 		ssusb->is_host = false;  in ssusb_set_mailbox()
177 		pm_relax(ssusb->dev);  in ssusb_set_mailbox()
181 		pm_stay_awake(ssusb->dev);  in ssusb_set_mailbox()
185 		dev_err(ssusb->dev, "invalid state\n");  in ssusb_set_mailbox()
194 	if (otg_sx->id_event)  in ssusb_id_work()
205 	if (otg_sx->vbus_event)  in ssusb_vbus_work()
221 	otg_sx->id_event = event;  in ssusb_id_notifier()
222 	schedule_work(&otg_sx->id_work);  in ssusb_id_notifier()
233 	otg_sx->vbus_event = event;  in ssusb_vbus_notifier()
234 	schedule_work(&otg_sx->vbus_work);  in ssusb_vbus_notifier()
243 	struct extcon_dev *edev = otg_sx->edev;  in ssusb_extcon_register()
250 	otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;  in ssusb_extcon_register()
251 	ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,  in ssusb_extcon_register()
252 					&otg_sx->vbus_nb);  in ssusb_extcon_register()
254 		dev_err(ssusb->dev, "failed to register notifier for USB\n");  in ssusb_extcon_register()
258 	otg_sx->id_nb.notifier_call = ssusb_id_notifier;  in ssusb_extcon_register()
259 	ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,  in ssusb_extcon_register()
260 					&otg_sx->id_nb);  in ssusb_extcon_register()
262 		dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");  in ssusb_extcon_register()
266 	dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",  in ssusb_extcon_register()
282  * This is useful in special cases, such as uses TYPE-A receptacle but also
283  * wants to support dual-role mode.
287 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_mode_switch()
305 	value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));  in ssusb_set_force_mode()
320 	mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);  in ssusb_set_force_mode()
323 static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)  in ssusb_role_sw_set()  argument
328 	if (role == USB_ROLE_HOST)  in ssusb_role_sw_set()
331 	if (to_host ^ ssusb->is_host)  in ssusb_role_sw_set()
340 	enum usb_role role;  in ssusb_role_sw_get()  local
342 	role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;  in ssusb_role_sw_get()
344 	return role;  in ssusb_role_sw_get()
353 	if (!otg_sx->role_sw_used)  in ssusb_role_sw_register()
358 	role_sx_desc.fwnode = dev_fwnode(ssusb->dev);  in ssusb_role_sw_register()
360 	otg_sx->role_sw = usb_role_switch_register(ssusb->dev, &role_sx_desc);  in ssusb_role_sw_register()
362 	return PTR_ERR_OR_ZERO(otg_sx->role_sw);  in ssusb_role_sw_register()
367 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_init()
370 	INIT_WORK(&otg_sx->id_work, ssusb_id_work);  in ssusb_otg_switch_init()
371 	INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work);  in ssusb_otg_switch_init()
373 	if (otg_sx->manual_drd_enabled)  in ssusb_otg_switch_init()
375 	else if (otg_sx->role_sw_used)  in ssusb_otg_switch_init()
385 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;  in ssusb_otg_switch_exit()
387 	cancel_work_sync(&otg_sx->id_work);  in ssusb_otg_switch_exit()
388 	cancel_work_sync(&otg_sx->vbus_work);  in ssusb_otg_switch_exit()
389 	usb_role_switch_unregister(otg_sx->role_sw);  in ssusb_otg_switch_exit()