1 // SPDX-License-Identifier: GPL-2.0
3  * otg.c - ChipIdea USB IP core OTG driver
38 	cable = &ci->platdata->vbus_extcon;  in hw_read_otgsc()
39 	if (!IS_ERR(cable->edev) || ci->role_switch) {  in hw_read_otgsc()
40 		if (cable->changed)  in hw_read_otgsc()
45 		if (cable->connected)  in hw_read_otgsc()
50 		if (cable->enabled)  in hw_read_otgsc()
56 	cable = &ci->platdata->id_extcon;  in hw_read_otgsc()
57 	if (!IS_ERR(cable->edev) || ci->role_switch) {  in hw_read_otgsc()
58 		if (cable->changed)  in hw_read_otgsc()
63 		if (cable->connected)  in hw_read_otgsc()
68 		if (cable->enabled)  in hw_read_otgsc()
81  * @data: to be written
83 void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)  in hw_write_otgsc()  argument
87 	cable = &ci->platdata->vbus_extcon;  in hw_write_otgsc()
88 	if (!IS_ERR(cable->edev) || ci->role_switch) {  in hw_write_otgsc()
89 		if (data & mask & OTGSC_BSVIS)  in hw_write_otgsc()
90 			cable->changed = false;  in hw_write_otgsc()
93 		if (data & mask & OTGSC_BSVIE) {  in hw_write_otgsc()
94 			cable->enabled = true;  in hw_write_otgsc()
95 			data &= ~OTGSC_BSVIE;  in hw_write_otgsc()
97 			cable->enabled = false;  in hw_write_otgsc()
101 	cable = &ci->platdata->id_extcon;  in hw_write_otgsc()
102 	if (!IS_ERR(cable->edev) || ci->role_switch) {  in hw_write_otgsc()
103 		if (data & mask & OTGSC_IDIS)  in hw_write_otgsc()
104 			cable->changed = false;  in hw_write_otgsc()
107 		if (data & mask & OTGSC_IDIE) {  in hw_write_otgsc()
108 			cable->enabled = true;  in hw_write_otgsc()
109 			data &= ~OTGSC_IDIE;  in hw_write_otgsc()
111 			cable->enabled = false;  in hw_write_otgsc()
115 	hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);  in hw_write_otgsc()
119  * ci_otg_role - pick role based on ID pin state
124 	enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)  in ci_otg_role()  local
128 	return role;  in ci_otg_role()
133 	if (!ci->is_otg)  in ci_handle_vbus_change()
136 	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)  in ci_handle_vbus_change()
137 		usb_gadget_vbus_connect(&ci->gadget);  in ci_handle_vbus_change()
138 	else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active)  in ci_handle_vbus_change()
139 		usb_gadget_vbus_disconnect(&ci->gadget);  in ci_handle_vbus_change()
157 			dev_err(ci->dev, "timeout waiting for %08x in OTGSC\n",  in hw_wait_vbus_lower_bsv()
159 			return -ETIMEDOUT;  in hw_wait_vbus_lower_bsv()
169 	enum ci_role role = ci_otg_role(ci);  in ci_handle_id_switch()  local
171 	if (role != ci->role) {  in ci_handle_id_switch()
172 		dev_dbg(ci->dev, "switching from %s to %s\n",  in ci_handle_id_switch()
173 			ci_role(ci)->name, ci->roles[role]->name);  in ci_handle_id_switch()
175 		if (ci->vbus_active && ci->role == CI_ROLE_GADGET)  in ci_handle_id_switch()
177 			 * vbus disconnect event is lost due to role  in ci_handle_id_switch()
180 			usb_gadget_vbus_disconnect(&ci->gadget);  in ci_handle_id_switch()
184 		if (role == CI_ROLE_GADGET &&  in ci_handle_id_switch()
185 				IS_ERR(ci->platdata->vbus_extcon.edev))  in ci_handle_id_switch()
195 		ci_role_start(ci, role);  in ci_handle_id_switch()
197 		if (role == CI_ROLE_GADGET)  in ci_handle_id_switch()
202  * ci_otg_work - perform otg (vbus/id) event handle
210 		enable_irq(ci->irq);  in ci_otg_work()
214 	pm_runtime_get_sync(ci->dev);  in ci_otg_work()
216 	if (ci->id_event) {  in ci_otg_work()
217 		ci->id_event = false;  in ci_otg_work()
221 	if (ci->b_sess_valid_event) {  in ci_otg_work()
222 		ci->b_sess_valid_event = false;  in ci_otg_work()
226 	pm_runtime_put_sync(ci->dev);  in ci_otg_work()
228 	enable_irq(ci->irq);  in ci_otg_work()
233  * ci_hdrc_otg_init - initialize otg struct
238 	INIT_WORK(&ci->work, ci_otg_work);  in ci_hdrc_otg_init()
239 	ci->wq = create_freezable_workqueue("ci_otg");  in ci_hdrc_otg_init()
240 	if (!ci->wq) {  in ci_hdrc_otg_init()
241 		dev_err(ci->dev, "can't create workqueue\n");  in ci_hdrc_otg_init()
242 		return -ENODEV;  in ci_hdrc_otg_init()
252  * ci_hdrc_otg_destroy - destroy otg struct
257 	if (ci->wq) {  in ci_hdrc_otg_destroy()
258 		flush_workqueue(ci->wq);  in ci_hdrc_otg_destroy()
259 		destroy_workqueue(ci->wq);  in ci_hdrc_otg_destroy()