1 // SPDX-License-Identifier: GPL-2.0
3  * otg.c - ChipIdea USB IP core OTG driver
11  * This file mainly handles otgsc register, OTG fsm operations for HNP and SRP
15 #include <linux/usb/otg.h>
21 #include "otg.h"
25  * hw_read_otgsc - returns otgsc register bits value.
35 	 * If using extcon framework for VBUS and/or ID signal  in hw_read_otgsc()
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()
78  * hw_write_otgsc - updates target bits of OTGSC register.
87 	cable = &ci->platdata->vbus_extcon;  in hw_write_otgsc()
88 	if (!IS_ERR(cable->edev) || ci->role_switch) {  in hw_write_otgsc()
90 			cable->changed = false;  in hw_write_otgsc()
94 			cable->enabled = true;  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()
104 			cable->changed = false;  in hw_write_otgsc()
106 		/* Don't enable id interrupt if using external notifier */  in hw_write_otgsc()
108 			cable->enabled = true;  in hw_write_otgsc()
111 			cable->enabled = false;  in hw_write_otgsc()
119  * ci_otg_role - pick role based on ID pin state
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()
143  * hw_wait_vbus_lower_bsv - When we switch to device mode, the vbus value
158 			dev_err(ci->dev, "timeout waiting for %08x in OTGSC\n",  in hw_wait_vbus_lower_bsv()
160 			return -ETIMEDOUT;  in hw_wait_vbus_lower_bsv()
172 	if (role != ci->role) {  in ci_handle_id_switch()
173 		dev_dbg(ci->dev, "switching from %s to %s\n",  in ci_handle_id_switch()
174 			ci_role(ci)->name, ci->roles[role]->name);  in ci_handle_id_switch()
176 		if (ci->vbus_active && ci->role == CI_ROLE_GADGET)  in ci_handle_id_switch()
181 			usb_gadget_vbus_disconnect(&ci->gadget);  in ci_handle_id_switch()
186 				IS_ERR(ci->platdata->vbus_extcon.edev))  in ci_handle_id_switch()
203  * ci_otg_work - perform otg (vbus/id) event handle
211 		enable_irq(ci->irq);  in ci_otg_work()
215 	pm_runtime_get_sync(ci->dev);  in ci_otg_work()
217 	if (ci->id_event) {  in ci_otg_work()
218 		ci->id_event = false;  in ci_otg_work()
222 	if (ci->b_sess_valid_event) {  in ci_otg_work()
223 		ci->b_sess_valid_event = false;  in ci_otg_work()
227 	pm_runtime_put_sync(ci->dev);  in ci_otg_work()
229 	enable_irq(ci->irq);  in ci_otg_work()
234  * ci_hdrc_otg_init - initialize otg struct
239 	INIT_WORK(&ci->work, ci_otg_work);  in ci_hdrc_otg_init()
240 	ci->wq = create_freezable_workqueue("ci_otg");  in ci_hdrc_otg_init()
241 	if (!ci->wq) {  in ci_hdrc_otg_init()
242 		dev_err(ci->dev, "can't create workqueue\n");  in ci_hdrc_otg_init()
243 		return -ENODEV;  in ci_hdrc_otg_init()
253  * ci_hdrc_otg_destroy - destroy otg struct
258 	if (ci->wq)  in ci_hdrc_otg_destroy()
259 		destroy_workqueue(ci->wq);  in ci_hdrc_otg_destroy()
261 	/* Disable all OTG irq and clear status */  in ci_hdrc_otg_destroy()