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"
25 #include "gadget-export.h"
30 static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)  in cdns3_role_start()  argument
34 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns3_role_start()
37 	mutex_lock(&cdns->mutex);  in cdns3_role_start()
38 	cdns->role = role;  in cdns3_role_start()
39 	mutex_unlock(&cdns->mutex);  in cdns3_role_start()
41 	if (!cdns->roles[role])  in cdns3_role_start()
42 		return -ENXIO;  in cdns3_role_start()
44 	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)  in cdns3_role_start()
47 	mutex_lock(&cdns->mutex);  in cdns3_role_start()
48 	ret = cdns->roles[role]->start(cdns);  in cdns3_role_start()
50 		cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;  in cdns3_role_start()
51 	mutex_unlock(&cdns->mutex);  in cdns3_role_start()
58 	enum usb_role role = cdns->role;  in cdns3_role_stop()  local
60 	if (WARN_ON(role > USB_ROLE_DEVICE))  in cdns3_role_stop()
63 	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)  in cdns3_role_stop()
66 	mutex_lock(&cdns->mutex);  in cdns3_role_stop()
67 	cdns->roles[role]->stop(cdns);  in cdns3_role_stop()
68 	cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;  in cdns3_role_stop()
69 	mutex_unlock(&cdns->mutex);  in cdns3_role_stop()
79  * cdns3_core_init_role - initialize role of operation
86 	struct device *dev = cdns->dev;  in cdns3_core_init_role()
92 	cdns->role = USB_ROLE_NONE;  in cdns3_core_init_role()
110 	 * At this point cdns->dr_mode contains strap configuration.  in cdns3_core_init_role()
113 	best_dr_mode = cdns->dr_mode;  in cdns3_core_init_role()
120 		best_dr_mode = cdns->dr_mode;  in cdns3_core_init_role()
121 	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {  in cdns3_core_init_role()
123 	} else if (cdns->dr_mode != dr_mode) {  in cdns3_core_init_role()
125 		return -EINVAL;  in cdns3_core_init_role()
148 	cdns->dr_mode = dr_mode;  in cdns3_core_init_role()
154 	/* Initialize idle role to start with */  in cdns3_core_init_role()
159 	switch (cdns->dr_mode) {  in cdns3_core_init_role()
176 		ret = -EINVAL;  in cdns3_core_init_role()
187  * cdns3_hw_role_state_machine  - role switch state machine based on hw events.
190  * Returns next role to be entered based on hw events.
194 	enum usb_role role = USB_ROLE_NONE;  in cdns3_hw_role_state_machine()  local
197 	if (cdns->dr_mode != USB_DR_MODE_OTG) {  in cdns3_hw_role_state_machine()
199 			role = USB_ROLE_HOST;  in cdns3_hw_role_state_machine()
201 			role = USB_ROLE_DEVICE;  in cdns3_hw_role_state_machine()
203 		return role;  in cdns3_hw_role_state_machine()
210 	 * Role change state machine  in cdns3_hw_role_state_machine()
212 	 * Previous state: cdns->role  in cdns3_hw_role_state_machine()
213 	 * Next state: role  in cdns3_hw_role_state_machine()
215 	role = cdns->role;  in cdns3_hw_role_state_machine()
217 	switch (role) {  in cdns3_hw_role_state_machine()
224 			role = USB_ROLE_HOST;  in cdns3_hw_role_state_machine()
226 			role = USB_ROLE_DEVICE;  in cdns3_hw_role_state_machine()
230 			role = USB_ROLE_NONE;  in cdns3_hw_role_state_machine()
234 			role = USB_ROLE_NONE;  in cdns3_hw_role_state_machine()
238 	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);  in cdns3_hw_role_state_machine()
240 	return role;  in cdns3_hw_role_state_machine()
251 	phy_reset(cdns->usb3_phy);  in cdns3_idle_role_stop()
258 	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);  in cdns3_idle_init()
260 		return -ENOMEM;  in cdns3_idle_init()
262 	rdrv->start = cdns3_idle_role_start;  in cdns3_idle_init()
263 	rdrv->stop = cdns3_idle_role_stop;  in cdns3_idle_init()
264 	rdrv->state = CDNS3_ROLE_STATE_INACTIVE;  in cdns3_idle_init()
265 	rdrv->suspend = NULL;  in cdns3_idle_init()
266 	rdrv->resume = NULL;  in cdns3_idle_init()
267 	rdrv->name = "idle";  in cdns3_idle_init()
269 	cdns->roles[USB_ROLE_NONE] = rdrv;  in cdns3_idle_init()
275  * cdns3_hw_role_switch - switch roles based on HW state
283 	/* Depends on role switch class */  in cdns3_hw_role_switch()
284 	if (cdns->role_sw)  in cdns3_hw_role_switch()
287 	pm_runtime_get_sync(cdns->dev);  in cdns3_hw_role_switch()
289 	current_role = cdns->role;  in cdns3_hw_role_switch()
298 	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);  in cdns3_hw_role_switch()
302 		/* Back to current role */  in cdns3_hw_role_switch()
303 		dev_err(cdns->dev, "set %d has failed, back to %d\n",  in cdns3_hw_role_switch()
307 			dev_err(cdns->dev, "back to %d failed too\n",  in cdns3_hw_role_switch()
311 	pm_runtime_put_sync(cdns->dev);  in cdns3_hw_role_switch()
316  * cdsn3_role_get - get current role of controller.
318  * @sw: pointer to USB role switch structure
320  * Returns role
326 	return cdns->role;  in cdns3_role_get()
330  * cdns3_role_set - set current role of controller.
332  * @sw: pointer to USB role switch structure
333  * @role: the previous role
335  * - Role switch for dual-role devices
336  * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
338 static int cdns3_role_set(struct usb_role_switch *sw, enum usb_role role)  in cdns3_role_set()  argument
343 	pm_runtime_get_sync(cdns->dev);  in cdns3_role_set()
345 	if (cdns->role == role)  in cdns3_role_set()
348 	if (cdns->dr_mode == USB_DR_MODE_HOST) {  in cdns3_role_set()
349 		switch (role) {  in cdns3_role_set()
358 	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {  in cdns3_role_set()
359 		switch (role) {  in cdns3_role_set()
369 	ret = cdns3_role_start(cdns, role);  in cdns3_role_set()
371 		dev_err(cdns->dev, "set role %d has failed\n", role);  in cdns3_role_set()
374 	pm_runtime_put_sync(cdns->dev);  in cdns3_role_set()
382 	ret = phy_power_on(cdns->usb2_phy);  in set_phy_power_on()
386 	ret = phy_power_on(cdns->usb3_phy);  in set_phy_power_on()
388 		phy_power_off(cdns->usb2_phy);  in set_phy_power_on()
395 	phy_power_off(cdns->usb3_phy);  in set_phy_power_off()
396 	phy_power_off(cdns->usb2_phy);  in set_phy_power_off()
400  * cdns3_wakeup_irq - interrupt handler for wakeup events
402  * @data: structure of cdns3
406 static irqreturn_t cdns3_wakeup_irq(int irq, void *data)  in cdns3_wakeup_irq()  argument
408 	struct cdns3 *cdns = data;  in cdns3_wakeup_irq()
410 	if (cdns->in_lpm) {  in cdns3_wakeup_irq()
412 		cdns->wakeup_pending = true;  in cdns3_wakeup_irq()
413 		if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)  in cdns3_wakeup_irq()
414 			pm_request_resume(&cdns->host_dev->dev);  in cdns3_wakeup_irq()
423  * cdns3_probe - probe for cdns3 core device
430 	struct device *dev = &pdev->dev;  in cdns3_probe()
444 		return -ENOMEM;  in cdns3_probe()
446 	cdns->dev = dev;  in cdns3_probe()
447 	cdns->pdata = dev_get_platdata(dev);  in cdns3_probe()
454 		return -ENODEV;  in cdns3_probe()
457 	cdns->xhci_res[0] = *res;  in cdns3_probe()
462 		return -ENXIO;  in cdns3_probe()
465 	cdns->xhci_res[1] = *res;  in cdns3_probe()
467 	cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");  in cdns3_probe()
468 	if (cdns->dev_irq == -EPROBE_DEFER)  in cdns3_probe()
469 		return cdns->dev_irq;  in cdns3_probe()
471 	if (cdns->dev_irq < 0)  in cdns3_probe()
477 	cdns->dev_regs	= regs;  in cdns3_probe()
479 	cdns->otg_irq = platform_get_irq_byname(pdev, "otg");  in cdns3_probe()
480 	if (cdns->otg_irq == -EPROBE_DEFER)  in cdns3_probe()
481 		return cdns->otg_irq;  in cdns3_probe()
483 	if (cdns->otg_irq < 0) {  in cdns3_probe()
485 		return cdns->otg_irq;  in cdns3_probe()
491 		return -ENXIO;  in cdns3_probe()
494 	cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");  in cdns3_probe()
496 	cdns->otg_res = *res;  in cdns3_probe()
498 	cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");  in cdns3_probe()
499 	if (cdns->wakeup_irq == -EPROBE_DEFER)  in cdns3_probe()
500 		return cdns->wakeup_irq;  in cdns3_probe()
501 	else if (cdns->wakeup_irq == 0)  in cdns3_probe()
502 		return -EINVAL;  in cdns3_probe()
504 	if (cdns->wakeup_irq < 0) {  in cdns3_probe()
506 		cdns->wakeup_irq = 0x0;  in cdns3_probe()
509 	mutex_init(&cdns->mutex);  in cdns3_probe()
511 	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");  in cdns3_probe()
512 	if (IS_ERR(cdns->usb2_phy))  in cdns3_probe()
513 		return PTR_ERR(cdns->usb2_phy);  in cdns3_probe()
515 	ret = phy_init(cdns->usb2_phy);  in cdns3_probe()
519 	cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");  in cdns3_probe()
520 	if (IS_ERR(cdns->usb3_phy))  in cdns3_probe()
521 		return PTR_ERR(cdns->usb3_phy);  in cdns3_probe()
523 	ret = phy_init(cdns->usb3_phy);  in cdns3_probe()
531 	if (device_property_read_bool(dev, "usb-role-switch")) {  in cdns3_probe()
538 		sw_desc.fwnode = dev->fwnode;  in cdns3_probe()
540 		cdns->role_sw = usb_role_switch_register(dev, &sw_desc);  in cdns3_probe()
541 		if (IS_ERR(cdns->role_sw)) {  in cdns3_probe()
542 			ret = PTR_ERR(cdns->role_sw);  in cdns3_probe()
543 			dev_warn(dev, "Unable to register Role Switch\n");  in cdns3_probe()
548 	if (cdns->wakeup_irq) {  in cdns3_probe()
549 		ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,  in cdns3_probe()
552 						dev_name(cdns->dev), cdns);  in cdns3_probe()
555 			dev_err(cdns->dev, "couldn't register wakeup irq handler\n");  in cdns3_probe()
568 	spin_lock_init(&cdns->lock);  in cdns3_probe()
587 	if (cdns->role_sw)  in cdns3_probe()
588 		usb_role_switch_unregister(cdns->role_sw);  in cdns3_probe()
592 	phy_exit(cdns->usb3_phy);  in cdns3_probe()
594 	phy_exit(cdns->usb2_phy);  in cdns3_probe()
600  * cdns3_remove - unbind drd driver and clean up
609 	pm_runtime_get_sync(&pdev->dev);  in cdns3_remove()
610 	pm_runtime_disable(&pdev->dev);  in cdns3_remove()
611 	pm_runtime_put_noidle(&pdev->dev);  in cdns3_remove()
613 	usb_role_switch_unregister(cdns->role_sw);  in cdns3_remove()
615 	phy_exit(cdns->usb2_phy);  in cdns3_remove()
616 	phy_exit(cdns->usb3_phy);  in cdns3_remove()
628 	if (cdns->pdata && cdns->pdata->platform_suspend)  in cdns3_set_platform_suspend()
629 		ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);  in cdns3_set_platform_suspend()
640 	if (cdns->in_lpm)  in cdns3_controller_suspend()
648 	cdns3_set_platform_suspend(cdns->dev, true, wakeup);  in cdns3_controller_suspend()
650 	spin_lock_irqsave(&cdns->lock, flags);  in cdns3_controller_suspend()
651 	cdns->in_lpm = true;  in cdns3_controller_suspend()
652 	spin_unlock_irqrestore(&cdns->lock, flags);  in cdns3_controller_suspend()
653 	dev_dbg(cdns->dev, "%s ends\n", __func__);  in cdns3_controller_suspend()
664 	if (!cdns->in_lpm)  in cdns3_controller_resume()
671 	cdns3_set_platform_suspend(cdns->dev, false, false);  in cdns3_controller_resume()
673 	spin_lock_irqsave(&cdns->lock, flags);  in cdns3_controller_resume()
674 	if (cdns->roles[cdns->role]->resume && !PMSG_IS_AUTO(msg))  in cdns3_controller_resume()
675 		cdns->roles[cdns->role]->resume(cdns, false);  in cdns3_controller_resume()
677 	cdns->in_lpm = false;  in cdns3_controller_resume()
678 	spin_unlock_irqrestore(&cdns->lock, flags);  in cdns3_controller_resume()
679 	if (cdns->wakeup_pending) {  in cdns3_controller_resume()
680 		cdns->wakeup_pending = false;  in cdns3_controller_resume()
681 		enable_irq(cdns->wakeup_irq);  in cdns3_controller_resume()
683 	dev_dbg(cdns->dev, "%s ends\n", __func__);  in cdns3_controller_resume()
707 	if (cdns->roles[cdns->role]->suspend) {  in cdns3_suspend()
708 		spin_lock_irqsave(&cdns->lock, flags);  in cdns3_suspend()
709 		cdns->roles[cdns->role]->suspend(cdns, false);  in cdns3_suspend()
710 		spin_unlock_irqrestore(&cdns->lock, flags);  in cdns3_suspend()
750 		.name	= "cdns-usb3",