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>
24 #include "host-export.h"
29 static int cdns_role_start(struct cdns *cdns, enum usb_role role)  in cdns_role_start()  argument
33 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns_role_start()
36 	mutex_lock(&cdns->mutex);  in cdns_role_start()
37 	cdns->role = role;  in cdns_role_start()
38 	mutex_unlock(&cdns->mutex);  in cdns_role_start()
40 	if (!cdns->roles[role])  in cdns_role_start()
41 		return -ENXIO;  in cdns_role_start()
43 	if (cdns->roles[role]->state == CDNS_ROLE_STATE_ACTIVE)  in cdns_role_start()
46 	mutex_lock(&cdns->mutex);  in cdns_role_start()
47 	ret = cdns->roles[role]->start(cdns);  in cdns_role_start()
49 		cdns->roles[role]->state = CDNS_ROLE_STATE_ACTIVE;  in cdns_role_start()
50 	mutex_unlock(&cdns->mutex);  in cdns_role_start()
57 	enum usb_role role = cdns->role;  in cdns_role_stop()  local
59 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns_role_stop()
62 	if (cdns->roles[role]->state == CDNS_ROLE_STATE_INACTIVE)  in cdns_role_stop()
65 	mutex_lock(&cdns->mutex);  in cdns_role_stop()
66 	cdns->roles[role]->stop(cdns);  in cdns_role_stop()
67 	cdns->roles[role]->state = CDNS_ROLE_STATE_INACTIVE;  in cdns_role_stop()
68 	mutex_unlock(&cdns->mutex);  in cdns_role_stop()
78  * cdns_core_init_role - initialize role of operation
85 	struct device *dev = cdns->dev;  in cdns_core_init_role()
91 	cdns->role = USB_ROLE_NONE;  in cdns_core_init_role()
99 		if (cdns->version == CDNSP_CONTROLLER_V2) {  in cdns_core_init_role()
119 	 * At this point cdns->dr_mode contains strap configuration.  in cdns_core_init_role()
122 	best_dr_mode = cdns->dr_mode;  in cdns_core_init_role()
129 		best_dr_mode = cdns->dr_mode;  in cdns_core_init_role()
130 	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {  in cdns_core_init_role()
132 	} else if (cdns->dr_mode != dr_mode) {  in cdns_core_init_role()
134 		return -EINVAL;  in cdns_core_init_role()
140 		if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_core_init_role()
142 		    (cdns->version < CDNSP_CONTROLLER_V2 &&  in cdns_core_init_role()
146 			ret = -ENXIO;  in cdns_core_init_role()
156 		if (cdns->gadget_init)  in cdns_core_init_role()
157 			ret = cdns->gadget_init(cdns);  in cdns_core_init_role()
159 			ret = -ENXIO;  in cdns_core_init_role()
168 	cdns->dr_mode = dr_mode;  in cdns_core_init_role()
174 	/* Initialize idle role to start with */  in cdns_core_init_role()
179 	switch (cdns->dr_mode) {  in cdns_core_init_role()
196 		ret = -EINVAL;  in cdns_core_init_role()
207  * cdns_hw_role_state_machine  - role switch state machine based on hw events.
210  * Returns next role to be entered based on hw events.
214 	enum usb_role role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()  local
217 	if (cdns->dr_mode != USB_DR_MODE_OTG) {  in cdns_hw_role_state_machine()
219 			role = USB_ROLE_HOST;  in cdns_hw_role_state_machine()
221 			role = USB_ROLE_DEVICE;  in cdns_hw_role_state_machine()
223 		return role;  in cdns_hw_role_state_machine()
230 	 * Role change state machine  in cdns_hw_role_state_machine()
232 	 * Previous state: cdns->role  in cdns_hw_role_state_machine()
233 	 * Next state: role  in cdns_hw_role_state_machine()
235 	role = cdns->role;  in cdns_hw_role_state_machine()
237 	switch (role) {  in cdns_hw_role_state_machine()
244 			role = USB_ROLE_HOST;  in cdns_hw_role_state_machine()
246 			role = USB_ROLE_DEVICE;  in cdns_hw_role_state_machine()
250 			role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()
254 			role = USB_ROLE_NONE;  in cdns_hw_role_state_machine()
258 	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);  in cdns_hw_role_state_machine()
260 	return role;  in cdns_hw_role_state_machine()
271 	phy_reset(cdns->usb3_phy);  in cdns_idle_role_stop()
278 	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);  in cdns_idle_init()
280 		return -ENOMEM;  in cdns_idle_init()
282 	rdrv->start = cdns_idle_role_start;  in cdns_idle_init()
283 	rdrv->stop = cdns_idle_role_stop;  in cdns_idle_init()
284 	rdrv->state = CDNS_ROLE_STATE_INACTIVE;  in cdns_idle_init()
285 	rdrv->suspend = NULL;  in cdns_idle_init()
286 	rdrv->resume = NULL;  in cdns_idle_init()
287 	rdrv->name = "idle";  in cdns_idle_init()
289 	cdns->roles[USB_ROLE_NONE] = rdrv;  in cdns_idle_init()
295  * cdns_hw_role_switch - switch roles based on HW state
303 	/* Depends on role switch class */  in cdns_hw_role_switch()
304 	if (cdns->role_sw)  in cdns_hw_role_switch()
307 	pm_runtime_get_sync(cdns->dev);  in cdns_hw_role_switch()
309 	current_role = cdns->role;  in cdns_hw_role_switch()
318 	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);  in cdns_hw_role_switch()
322 		/* Back to current role */  in cdns_hw_role_switch()
323 		dev_err(cdns->dev, "set %d has failed, back to %d\n",  in cdns_hw_role_switch()
327 			dev_err(cdns->dev, "back to %d failed too\n",  in cdns_hw_role_switch()
331 	pm_runtime_put_sync(cdns->dev);  in cdns_hw_role_switch()
336  * cdns_role_get - get current role of controller.
338  * @sw: pointer to USB role switch structure
340  * Returns role
346 	return cdns->role;  in cdns_role_get()
350  * cdns_role_set - set current role of controller.
352  * @sw: pointer to USB role switch structure
353  * @role: the previous role
355  * - Role switch for dual-role devices
356  * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
358 static int cdns_role_set(struct usb_role_switch *sw, enum usb_role role)  in cdns_role_set()  argument
363 	pm_runtime_get_sync(cdns->dev);  in cdns_role_set()
365 	if (cdns->role == role)  in cdns_role_set()
368 	if (cdns->dr_mode == USB_DR_MODE_HOST) {  in cdns_role_set()
369 		switch (role) {  in cdns_role_set()
378 	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {  in cdns_role_set()
379 		switch (role) {  in cdns_role_set()
389 	ret = cdns_role_start(cdns, role);  in cdns_role_set()
391 		dev_err(cdns->dev, "set role %d has failed\n", role);  in cdns_role_set()
394 	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()
532 		if (cdns->role_sw) {  in cdns_resume()
533 			cdns->role = cdns_role_get(cdns->role_sw);  in cdns_resume()
536 			if (real_role != cdns->role) {  in cdns_resume()
545 			if (cdns->role == USB_ROLE_HOST)  in cdns_resume()
547 			else if (cdns->role == USB_ROLE_DEVICE)  in cdns_resume()
555 	if (cdns->roles[cdns->role]->resume)  in cdns_resume()
556 		cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));  in cdns_resume()
564 	struct device *dev = cdns->dev;  in cdns_set_active()