1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2018-2020 Cadence.
16 #include <linux/usb/otg.h>
22  * cdns_set_mode - change mode of OTG Core
39 		dev_dbg(cdns->dev, "Set controller to OTG mode\n");  in cdns_set_mode()
41 		if (cdns->version == CDNSP_CONTROLLER_V2)  in cdns_set_mode()
42 			override_reg = &cdns->otg_cdnsp_regs->override;  in cdns_set_mode()
43 		else if (cdns->version == CDNS3_CONTROLLER_V1)  in cdns_set_mode()
44 			override_reg = &cdns->otg_v1_regs->override;  in cdns_set_mode()
46 			override_reg = &cdns->otg_v0_regs->ctrl1;  in cdns_set_mode()
50 		if (cdns->version != CDNS3_CONTROLLER_V0)  in cdns_set_mode()
57 		if (cdns->version == CDNS3_CONTROLLER_V1) {  in cdns_set_mode()
64 			if (cdns->phyrst_a_enable) {  in cdns_set_mode()
65 				reg = readl(&cdns->otg_v1_regs->phyrst_cfg);  in cdns_set_mode()
67 				writel(reg, &cdns->otg_v1_regs->phyrst_cfg);  in cdns_set_mode()
79 		dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);  in cdns_set_mode()
80 		return -EINVAL;  in cdns_set_mode()
88 	int id;  in cdns_get_id()  local
90 	id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;  in cdns_get_id()
91 	dev_dbg(cdns->dev, "OTG ID: %d", id);  in cdns_get_id()
93 	return id;  in cdns_get_id()
100 	vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID);  in cdns_get_vbus()
101 	dev_dbg(cdns->dev, "OTG VBUS: %d", vbus);  in cdns_get_vbus()
110 	if (cdns->version != CDNSP_CONTROLLER_V2)  in cdns_clear_vbus()
113 	reg = readl(&cdns->otg_cdnsp_regs->override);  in cdns_clear_vbus()
115 	writel(reg, &cdns->otg_cdnsp_regs->override);  in cdns_clear_vbus()
123 	if (cdns->version != CDNSP_CONTROLLER_V2)  in cdns_set_vbus()
126 	reg = readl(&cdns->otg_cdnsp_regs->override);  in cdns_set_vbus()
128 	writel(reg, &cdns->otg_cdnsp_regs->override);  in cdns_set_vbus()
134 	if (cdns->dr_mode == USB_DR_MODE_HOST)  in cdns_is_host()
144 	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL)  in cdns_is_device()
146 	else if (cdns->dr_mode == USB_DR_MODE_OTG)  in cdns_is_device()
154  * cdns_otg_disable_irq - Disable all OTG interrupts
159 	writel(0, &cdns->otg_irq_regs->ien);  in cdns_otg_disable_irq()
163  * cdns_otg_enable_irq - enable id and sess_valid interrupts
169 	       OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_irq_regs->ien);  in cdns_otg_enable_irq()
173  * cdns_drd_host_on - start host.
185 	       &cdns->otg_regs->cmd);  in cdns_drd_host_on()
187 	if (cdns->version == CDNSP_CONTROLLER_V2)  in cdns_drd_host_on()
192 	dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");  in cdns_drd_host_on()
193 	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns_drd_host_on()
197 		dev_err(cdns->dev, "timeout waiting for xhci_ready\n");  in cdns_drd_host_on()
199 	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_HOST);  in cdns_drd_host_on()
204  * cdns_drd_host_off - stop host.
213 	       &cdns->otg_regs->cmd);  in cdns_drd_host_off()
216 	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns_drd_host_off()
219 	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);  in cdns_drd_host_off()
223  * cdns_drd_gadget_on - start gadget.
234 	/* switch OTG core */  in cdns_drd_gadget_on()
235 	writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);  in cdns_drd_gadget_on()
237 	dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");  in cdns_drd_gadget_on()
239 	if (cdns->version == CDNSP_CONTROLLER_V2)  in cdns_drd_gadget_on()
244 	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns_drd_gadget_on()
247 		dev_err(cdns->dev, "timeout waiting for dev_ready\n");  in cdns_drd_gadget_on()
251 	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_DEVICE);  in cdns_drd_gadget_on()
257  * cdns_drd_gadget_off - stop gadget.
266 	 * before turning-off Device (DEV_BUS_DROP).  in cdns_drd_gadget_off()
271 	       &cdns->otg_regs->cmd);  in cdns_drd_gadget_off()
273 	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns_drd_gadget_off()
276 	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);  in cdns_drd_gadget_off()
281  * cdns_init_otg_mode - initialize drd controller
292 	writel(~0, &cdns->otg_irq_regs->ivect);  in cdns_init_otg_mode()
304  * cdns_drd_update_mode - initialize mode of operation
313 	switch (cdns->dr_mode) {  in cdns_drd_update_mode()
324 		dev_err(cdns->dev, "Unsupported mode of operation %d\n",  in cdns_drd_update_mode()
325 			cdns->dr_mode);  in cdns_drd_update_mode()
326 		return -EINVAL;  in cdns_drd_update_mode()
342  * cdns_drd_irq - interrupt handler for OTG events
355 	if (cdns->dr_mode != USB_DR_MODE_OTG)  in cdns_drd_irq()
358 	if (cdns->in_lpm)  in cdns_drd_irq()
361 	reg = readl(&cdns->otg_irq_regs->ivect);  in cdns_drd_irq()
367 		dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n",  in cdns_drd_irq()
374 		dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n",  in cdns_drd_irq()
380 	writel(~0, &cdns->otg_irq_regs->ivect);  in cdns_drd_irq()
390 	regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);  in cdns_drd_init()
399 	 * and v2 the first register contains device ID number which is not  in cdns_drd_init()
403 	cdns->otg_v0_regs = regs;  in cdns_drd_init()
404 	if (!readl(&cdns->otg_v0_regs->cmd)) {  in cdns_drd_init()
405 		cdns->version  = CDNS3_CONTROLLER_V0;  in cdns_drd_init()
406 		cdns->otg_v1_regs = NULL;  in cdns_drd_init()
407 		cdns->otg_cdnsp_regs = NULL;  in cdns_drd_init()
408 		cdns->otg_regs = regs;  in cdns_drd_init()
409 		cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem  *)  in cdns_drd_init()
410 				     &cdns->otg_v0_regs->ien;  in cdns_drd_init()
411 		writel(1, &cdns->otg_v0_regs->simulate);  in cdns_drd_init()
412 		dev_dbg(cdns->dev, "DRD version v0 (%08x)\n",  in cdns_drd_init()
413 			 readl(&cdns->otg_v0_regs->version));  in cdns_drd_init()
415 		cdns->otg_v0_regs = NULL;  in cdns_drd_init()
416 		cdns->otg_v1_regs = regs;  in cdns_drd_init()
417 		cdns->otg_cdnsp_regs = regs;  in cdns_drd_init()
419 		cdns->otg_regs = (void __iomem *)&cdns->otg_v1_regs->cmd;  in cdns_drd_init()
421 		if (readl(&cdns->otg_cdnsp_regs->did) == OTG_CDNSP_DID) {  in cdns_drd_init()
422 			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)  in cdns_drd_init()
423 					      &cdns->otg_cdnsp_regs->ien;  in cdns_drd_init()
424 			cdns->version  = CDNSP_CONTROLLER_V2;  in cdns_drd_init()
426 			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)  in cdns_drd_init()
427 					      &cdns->otg_v1_regs->ien;  in cdns_drd_init()
428 			writel(1, &cdns->otg_v1_regs->simulate);  in cdns_drd_init()
429 			cdns->version  = CDNS3_CONTROLLER_V1;  in cdns_drd_init()
432 		dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",  in cdns_drd_init()
433 			 readl(&cdns->otg_v1_regs->did),  in cdns_drd_init()
434 			 readl(&cdns->otg_v1_regs->rid));  in cdns_drd_init()
437 	state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));  in cdns_drd_init()
440 	cdns->dr_mode = USB_DR_MODE_OTG;  in cdns_drd_init()
442 	if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
444 	    (cdns->version != CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
446 		dev_dbg(cdns->dev, "Controller strapped to HOST\n");  in cdns_drd_init()
447 		cdns->dr_mode = USB_DR_MODE_HOST;  in cdns_drd_init()
448 	} else if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
450 		   (cdns->version != CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
452 		dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");  in cdns_drd_init()
453 		cdns->dr_mode = USB_DR_MODE_PERIPHERAL;  in cdns_drd_init()
456 	ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq,  in cdns_drd_init()
460 					dev_name(cdns->dev), cdns);  in cdns_drd_init()
462 		dev_err(cdns->dev, "couldn't get otg_irq\n");  in cdns_drd_init()
466 	state = readl(&cdns->otg_regs->sts);  in cdns_drd_init()
468 		dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");  in cdns_drd_init()
469 		return -ENODEV;  in cdns_drd_init()
486 	if (cdns->version == CDNS3_CONTROLLER_V0) {  in cdns_power_is_lost()
487 		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))  in cdns_power_is_lost()
490 		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))  in cdns_power_is_lost()