1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2018-2019 Cadence.
6  * Copyright (C) 2017-2018 NXP
14 #include <linux/dma-mapping.h>
23 #include "host-export.h"
28 static int cdns_role_start(struct cdns *cdns, enum usb_role role)  in cdns_role_start()  argument
32 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns_role_start()
35 	mutex_lock(&cdns->mutex);  in cdns_role_start()
36 	cdns->role = role;  in cdns_role_start()
37 	mutex_unlock(&cdns->mutex);  in cdns_role_start()
39 	if (!cdns->roles[role])  in cdns_role_start()
40 		return -ENXIO;  in cdns_role_start()
42 	if (cdns->roles[role]->state == CDNS_ROLE_STATE_ACTIVE)  in cdns_role_start()
45 	mutex_lock(&cdns->mutex);  in cdns_role_start()
46 	ret = cdns->roles[role]->start(cdns);  in cdns_role_start()
48 		cdns->roles[role]->state = CDNS_ROLE_STATE_ACTIVE;  in cdns_role_start()
49 	mutex_unlock(&cdns->mutex);  in cdns_role_start()
56 	enum usb_role role = cdns->role;  in cdns_role_stop()  local
58 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns_role_stop()
61 	if (cdns->roles[role]->state == CDNS_ROLE_STATE_INACTIVE)  in cdns_role_stop()
64 	mutex_lock(&cdns->mutex);  in cdns_role_stop()
65 	cdns->roles[role]->stop(cdns);  in cdns_role_stop()
66 	cdns->roles[role]->state = CDNS_ROLE_STATE_INACTIVE;  in cdns_role_stop()
67 	mutex_unlock(&cdns->mutex);  in cdns_role_stop()
77  * cdns_core_init_role - initialize role of operation
84 	struct device *dev = cdns->dev;  in cdns_core_init_role()
90 	cdns->role = USB_ROLE_NONE;  in cdns_core_init_role()
98 		if (cdns->version == CDNSP_CONTROLLER_V2) {  in cdns_core_init_role()
118 	 * At this point cdns->dr_mode contains strap configuration.  in cdns_core_init_role()
121 	best_dr_mode = cdns->dr_mode;  in cdns_core_init_role()
128 		best_dr_mode = cdns->dr_mode;  in cdns_core_init_role()
129 	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {  in cdns_core_init_role()
131 	} else if (cdns->dr_mode != dr_mode) {  in cdns_core_init_role()
133 		return -EINVAL;  in cdns_core_init_role()
139 		if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_core_init_role()
141 		    (cdns->version < CDNSP_CONTROLLER_V2 &&  in cdns_core_init_role()
145 			ret = -ENXIO;  in cdns_core_init_role()
155 		if (cdns->gadget_init)  in cdns_core_init_role()
156 			ret = cdns->gadget_init(cdns);  in cdns_core_init_role()
158 			ret = -ENXIO;  in cdns_core_init_role()
167 	cdns->dr_mode = dr_mode;  in cdns_core_init_role()
173 	/* Initialize idle role to start with */  in cdns_core_init_role()
178 	switch (cdns->dr_mode) {  in cdns_core_init_role()
195 		ret = -EINVAL;  in cdns_core_init_role()
206  * cdns_hw_role_state_machine  - role switch state machine based on hw events.
209  * Returns next role to be entered based on hw events.
213 	enum usb_role role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()  local
216 	if (cdns->dr_mode != USB_DR_MODE_OTG) {  in cdns_hw_role_state_machine()
218 			role = USB_ROLE_HOST;  in cdns_hw_role_state_machine()
220 			role = USB_ROLE_DEVICE;  in cdns_hw_role_state_machine()
222 		return role;  in cdns_hw_role_state_machine()
229 	 * Role change state machine  in cdns_hw_role_state_machine()
231 	 * Previous state: cdns->role  in cdns_hw_role_state_machine()
232 	 * Next state: role  in cdns_hw_role_state_machine()
234 	role = cdns->role;  in cdns_hw_role_state_machine()
236 	switch (role) {  in cdns_hw_role_state_machine()
243 			role = USB_ROLE_HOST;  in cdns_hw_role_state_machine()
245 			role = USB_ROLE_DEVICE;  in cdns_hw_role_state_machine()
249 			role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()
253 			role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()
257 	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);  in cdns_hw_role_state_machine()
259 	return role;  in cdns_hw_role_state_machine()
270 	phy_reset(cdns->usb3_phy);  in cdns_idle_role_stop()
277 	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);  in cdns_idle_init()
279 		return -ENOMEM;  in cdns_idle_init()
281 	rdrv->start = cdns_idle_role_start;  in cdns_idle_init()
282 	rdrv->stop = cdns_idle_role_stop;  in cdns_idle_init()
283 	rdrv->state = CDNS_ROLE_STATE_INACTIVE;  in cdns_idle_init()
284 	rdrv->suspend = NULL;  in cdns_idle_init()
285 	rdrv->resume = NULL;  in cdns_idle_init()
286 	rdrv->name = "idle";  in cdns_idle_init()
288 	cdns->roles[USB_ROLE_NONE] = rdrv;  in cdns_idle_init()
294  * cdns_hw_role_switch - switch roles based on HW state
302 	/* Depends on role switch class */  in cdns_hw_role_switch()
303 	if (cdns->role_sw)  in cdns_hw_role_switch()
306 	pm_runtime_get_sync(cdns->dev);  in cdns_hw_role_switch()
308 	current_role = cdns->role;  in cdns_hw_role_switch()
317 	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);  in cdns_hw_role_switch()
321 		/* Back to current role */  in cdns_hw_role_switch()
322 		dev_err(cdns->dev, "set %d has failed, back to %d\n",  in cdns_hw_role_switch()
326 			dev_err(cdns->dev, "back to %d failed too\n",  in cdns_hw_role_switch()
330 	pm_runtime_put_sync(cdns->dev);  in cdns_hw_role_switch()
335  * cdns_role_get - get current role of controller.
337  * @sw: pointer to USB role switch structure
339  * Returns role
345 	return cdns->role;  in cdns_role_get()
349  * cdns_role_set - set current role of controller.
351  * @sw: pointer to USB role switch structure
352  * @role: the previous role
354  * - Role switch for dual-role devices
355  * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
357 static int cdns_role_set(struct usb_role_switch *sw, enum usb_role role)  in cdns_role_set()  argument
362 	pm_runtime_get_sync(cdns->dev);  in cdns_role_set()
364 	if (cdns->role == role)  in cdns_role_set()
367 	if (cdns->dr_mode == USB_DR_MODE_HOST) {  in cdns_role_set()
368 		switch (role) {  in cdns_role_set()
377 	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {  in cdns_role_set()
378 		switch (role) {  in cdns_role_set()
388 	ret = cdns_role_start(cdns, role);  in cdns_role_set()
390 		dev_err(cdns->dev, "set role %d has failed\n", role);  in cdns_role_set()
393 	pm_runtime_put_sync(cdns->dev);  in cdns_role_set()
399  * cdns_wakeup_irq - interrupt handler for wakeup events
401  * @data: structure of cdns
405 static irqreturn_t cdns_wakeup_irq(int irq, void *data)  in cdns_wakeup_irq()  argument
407 	struct cdns *cdns = data;  in cdns_wakeup_irq()
409 	if (cdns->in_lpm) {  in cdns_wakeup_irq()
411 		cdns->wakeup_pending = true;  in cdns_wakeup_irq()
412 		if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)  in cdns_wakeup_irq()
413 			pm_request_resume(&cdns->host_dev->dev);  in cdns_wakeup_irq()
422  * cdns_init - probe for cdns3/cdnsp core device
429 	struct device *dev = cdns->dev;  in cdns_init()
438 	mutex_init(&cdns->mutex);  in cdns_init()
440 	if (device_property_read_bool(dev, "usb-role-switch")) {  in cdns_init()
447 		sw_desc.fwnode = dev->fwnode;  in cdns_init()
449 		cdns->role_sw = usb_role_switch_register(dev, &sw_desc);  in cdns_init()
450 		if (IS_ERR(cdns->role_sw)) {  in cdns_init()
451 			dev_warn(dev, "Unable to register Role Switch\n");  in cdns_init()
452 			return PTR_ERR(cdns->role_sw);  in cdns_init()
456 	if (cdns->wakeup_irq) {  in cdns_init()
457 		ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,  in cdns_init()
460 						dev_name(cdns->dev), cdns);  in cdns_init()
463 			dev_err(cdns->dev, "couldn't register wakeup irq handler\n");  in cdns_init()
476 	spin_lock_init(&cdns->lock);  in cdns_init()
484 	if (cdns->role_sw)  in cdns_init()
485 		usb_role_switch_unregister(cdns->role_sw);  in cdns_init()
492  * cdns_remove - unbind drd driver and clean up
500 	usb_role_switch_unregister(cdns->role_sw);  in cdns_remove()
509 	struct device *dev = cdns->dev;  in cdns_suspend()
515 	if (cdns->roles[cdns->role]->suspend) {  in cdns_suspend()
516 		spin_lock_irqsave(&cdns->lock, flags);  in cdns_suspend()
517 		cdns->roles[cdns->role]->suspend(cdns, false);  in cdns_suspend()
518 		spin_unlock_irqrestore(&cdns->lock, flags);  in cdns_suspend()
527 	struct device *dev = cdns->dev;  in cdns_resume()
533 		if (cdns->role_sw) {  in cdns_resume()
534 			cdns->role = cdns_role_get(cdns->role_sw);  in cdns_resume()
537 			if (real_role != cdns->role) {  in cdns_resume()
546 			if (cdns->role == USB_ROLE_HOST)  in cdns_resume()
548 			else if (cdns->role == USB_ROLE_DEVICE)  in cdns_resume()
556 	if (cdns->roles[cdns->role]->resume)  in cdns_resume()
557 		cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));  in cdns_resume()