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
33 	switch (mode) {  in cdns_set_mode()
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()
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()
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 	if (cdns->version)  in cdns_otg_disable_irq()
160 		writel(0, &cdns->otg_irq_regs->ien);  in cdns_otg_disable_irq()
164  * cdns_otg_enable_irq - enable id and sess_valid interrupts
170 	       OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_irq_regs->ien);  in cdns_otg_enable_irq()
174  * cdns_drd_host_on - start host.
186 	       &cdns->otg_regs->cmd);  in cdns_drd_host_on()
188 	if (cdns->version == CDNSP_CONTROLLER_V2)  in cdns_drd_host_on()
193 	dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");  in cdns_drd_host_on()
194 	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns_drd_host_on()
198 		dev_err(cdns->dev, "timeout waiting for xhci_ready\n");  in cdns_drd_host_on()
200 	phy_set_mode(cdns->usb2_phy, PHY_MODE_USB_HOST);  in cdns_drd_host_on()
201 	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_HOST);  in cdns_drd_host_on()
206  * cdns_drd_host_off - stop host.
215 	       &cdns->otg_regs->cmd);  in cdns_drd_host_off()
218 	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns_drd_host_off()
221 	phy_set_mode(cdns->usb2_phy, PHY_MODE_INVALID);  in cdns_drd_host_off()
222 	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);  in cdns_drd_host_off()
226  * cdns_drd_gadget_on - start gadget.
237 	/* switch OTG core */  in cdns_drd_gadget_on()
238 	writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);  in cdns_drd_gadget_on()
240 	dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");  in cdns_drd_gadget_on()
242 	if (cdns->version == CDNSP_CONTROLLER_V2)  in cdns_drd_gadget_on()
247 	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns_drd_gadget_on()
250 		dev_err(cdns->dev, "timeout waiting for dev_ready\n");  in cdns_drd_gadget_on()
254 	phy_set_mode(cdns->usb2_phy, PHY_MODE_USB_DEVICE);  in cdns_drd_gadget_on()
255 	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_DEVICE);  in cdns_drd_gadget_on()
261  * cdns_drd_gadget_off - stop gadget.
270 	 * before turning-off Device (DEV_BUS_DROP).  in cdns_drd_gadget_off()
275 	       &cdns->otg_regs->cmd);  in cdns_drd_gadget_off()
277 	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns_drd_gadget_off()
280 	phy_set_mode(cdns->usb2_phy, PHY_MODE_INVALID);  in cdns_drd_gadget_off()
281 	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);  in cdns_drd_gadget_off()
286  * cdns_init_otg_mode - initialize drd controller
297 	writel(~0, &cdns->otg_irq_regs->ivect);  in cdns_init_otg_mode()
309  * cdns_drd_update_mode - initialize mode of operation
318 	switch (cdns->dr_mode) {  in cdns_drd_update_mode()
329 		dev_err(cdns->dev, "Unsupported mode of operation %d\n",  in cdns_drd_update_mode()
330 			cdns->dr_mode);  in cdns_drd_update_mode()
331 		return -EINVAL;  in cdns_drd_update_mode()
347  * cdns_drd_irq - interrupt handler for OTG events
360 	if (cdns->dr_mode != USB_DR_MODE_OTG)  in cdns_drd_irq()
363 	if (cdns->in_lpm)  in cdns_drd_irq()
366 	reg = readl(&cdns->otg_irq_regs->ivect);  in cdns_drd_irq()
372 		dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n",  in cdns_drd_irq()
379 		dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n",  in cdns_drd_irq()
385 	writel(~0, &cdns->otg_irq_regs->ivect);  in cdns_drd_irq()
395 	regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);  in cdns_drd_init()
408 	cdns->otg_v0_regs = regs;  in cdns_drd_init()
409 	if (!readl(&cdns->otg_v0_regs->cmd)) {  in cdns_drd_init()
410 		cdns->version  = CDNS3_CONTROLLER_V0;  in cdns_drd_init()
411 		cdns->otg_v1_regs = NULL;  in cdns_drd_init()
412 		cdns->otg_cdnsp_regs = NULL;  in cdns_drd_init()
413 		cdns->otg_regs = regs;  in cdns_drd_init()
414 		cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem  *)  in cdns_drd_init()
415 				     &cdns->otg_v0_regs->ien;  in cdns_drd_init()
416 		writel(1, &cdns->otg_v0_regs->simulate);  in cdns_drd_init()
417 		dev_dbg(cdns->dev, "DRD version v0 (%08x)\n",  in cdns_drd_init()
418 			 readl(&cdns->otg_v0_regs->version));  in cdns_drd_init()
420 		cdns->otg_v0_regs = NULL;  in cdns_drd_init()
421 		cdns->otg_v1_regs = regs;  in cdns_drd_init()
422 		cdns->otg_cdnsp_regs = regs;  in cdns_drd_init()
424 		cdns->otg_regs = (void __iomem *)&cdns->otg_v1_regs->cmd;  in cdns_drd_init()
426 		state = readl(&cdns->otg_cdnsp_regs->did);  in cdns_drd_init()
429 			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)  in cdns_drd_init()
430 					      &cdns->otg_cdnsp_regs->ien;  in cdns_drd_init()
431 			cdns->version  = CDNSP_CONTROLLER_V2;  in cdns_drd_init()
433 			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)  in cdns_drd_init()
434 					      &cdns->otg_v1_regs->ien;  in cdns_drd_init()
435 			writel(1, &cdns->otg_v1_regs->simulate);  in cdns_drd_init()
437 			if (cdns->pdata &&  in cdns_drd_init()
438 			    (cdns->pdata->quirks & CDNS3_DRD_SUSPEND_RESIDENCY_ENABLE)) {  in cdns_drd_init()
439 				reg = readl(&cdns->otg_v1_regs->susp_ctrl);  in cdns_drd_init()
441 				writel(reg, &cdns->otg_v1_regs->susp_ctrl);  in cdns_drd_init()
444 			cdns->version  = CDNS3_CONTROLLER_V1;  in cdns_drd_init()
446 			dev_err(cdns->dev, "not supported DID=0x%08x\n", state);  in cdns_drd_init()
447 			return -EINVAL;  in cdns_drd_init()
450 		dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",  in cdns_drd_init()
451 			 readl(&cdns->otg_v1_regs->did),  in cdns_drd_init()
452 			 readl(&cdns->otg_v1_regs->rid));  in cdns_drd_init()
455 	state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));  in cdns_drd_init()
458 	cdns->dr_mode = USB_DR_MODE_OTG;  in cdns_drd_init()
460 	if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
462 	    (cdns->version != CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
464 		dev_dbg(cdns->dev, "Controller strapped to HOST\n");  in cdns_drd_init()
465 		cdns->dr_mode = USB_DR_MODE_HOST;  in cdns_drd_init()
466 	} else if ((cdns->version == CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
468 		   (cdns->version != CDNSP_CONTROLLER_V2 &&  in cdns_drd_init()
470 		dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");  in cdns_drd_init()
471 		cdns->dr_mode = USB_DR_MODE_PERIPHERAL;  in cdns_drd_init()
474 	ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq,  in cdns_drd_init()
478 					dev_name(cdns->dev), cdns);  in cdns_drd_init()
480 		dev_err(cdns->dev, "couldn't get otg_irq\n");  in cdns_drd_init()
484 	state = readl(&cdns->otg_regs->sts);  in cdns_drd_init()
486 		dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");  in cdns_drd_init()
487 		return -ENODEV;  in cdns_drd_init()
503 	if (cdns->version == CDNS3_CONTROLLER_V0) {  in cdns_power_is_lost()
504 		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))  in cdns_power_is_lost()
507 		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))  in cdns_power_is_lost()