1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2018-2019 Cadence.
17 #include <linux/usb/otg.h>
26  * cdns3_set_mode - change mode of OTG Core
43 		dev_dbg(cdns->dev, "Set controller to OTG mode\n");  in cdns3_set_mode()
44 		if (cdns->version == CDNS3_CONTROLLER_V1) {  in cdns3_set_mode()
45 			reg = readl(&cdns->otg_v1_regs->override);  in cdns3_set_mode()
47 			writel(reg, &cdns->otg_v1_regs->override);  in cdns3_set_mode()
49 			reg = readl(&cdns->otg_v0_regs->ctrl1);  in cdns3_set_mode()
51 			writel(reg, &cdns->otg_v0_regs->ctrl1);  in cdns3_set_mode()
62 		dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);  in cdns3_set_mode()
63 		return -EINVAL;  in cdns3_set_mode()
73 	id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;  in cdns3_get_id()
74 	dev_dbg(cdns->dev, "OTG ID: %d", id);  in cdns3_get_id()
83 	vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID);  in cdns3_get_vbus()
84 	dev_dbg(cdns->dev, "OTG VBUS: %d", vbus);  in cdns3_get_vbus()
91 	if (cdns->dr_mode == USB_DR_MODE_HOST)  in cdns3_is_host()
101 	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL)  in cdns3_is_device()
103 	else if (cdns->dr_mode == USB_DR_MODE_OTG)  in cdns3_is_device()
111  * cdns3_drd_switch_host - start/stop host
122 	/* switch OTG core */  in cdns3_drd_switch_host()
124 		writel(OTGCMD_HOST_BUS_REQ | reg, &cdns->otg_regs->cmd);  in cdns3_drd_switch_host()
126 		dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");  in cdns3_drd_switch_host()
127 		ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns3_drd_switch_host()
131 			dev_err(cdns->dev, "timeout waiting for xhci_ready\n");  in cdns3_drd_switch_host()
137 		       &cdns->otg_regs->cmd);  in cdns3_drd_switch_host()
139 		readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns3_drd_switch_host()
148  * cdns3_drd_switch_gadget - start/stop gadget
159 	/* switch OTG core */  in cdns3_drd_switch_gadget()
161 		writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);  in cdns3_drd_switch_gadget()
163 		dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");  in cdns3_drd_switch_gadget()
165 		ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,  in cdns3_drd_switch_gadget()
169 			dev_err(cdns->dev, "timeout waiting for dev_ready\n");  in cdns3_drd_switch_gadget()
175 		 * before turning-off Device (DEV_BUS_DROP)  in cdns3_drd_switch_gadget()
180 		       &cdns->otg_regs->cmd);  in cdns3_drd_switch_gadget()
182 		readl_poll_timeout_atomic(&cdns->otg_regs->state, val,  in cdns3_drd_switch_gadget()
191  * cdns3_init_otg_mode - initialize drd controller
201 	writel(~0, &cdns->otg_regs->ivect);  in cdns3_init_otg_mode()
211  * cdns3_drd_update_mode - initialize mode of operation
220 	switch (cdns->dr_mode) {  in cdns3_drd_update_mode()
231 		dev_err(cdns->dev, "Unsupported mode of operation %d\n",  in cdns3_drd_update_mode()
232 			cdns->dr_mode);  in cdns3_drd_update_mode()
233 		return -EINVAL;  in cdns3_drd_update_mode()
245 	regs = dev_remap_addr_name(cdns->dev, "otg");  in cdns3_drd_init()
247 		return -EINVAL;  in cdns3_drd_init()
258 	cdns->otg_v0_regs = regs;  in cdns3_drd_init()
259 	if (!readl(&cdns->otg_v0_regs->cmd)) {  in cdns3_drd_init()
260 		cdns->version  = CDNS3_CONTROLLER_V0;  in cdns3_drd_init()
261 		cdns->otg_v1_regs = NULL;  in cdns3_drd_init()
262 		cdns->otg_regs = regs;  in cdns3_drd_init()
263 		writel(1, &cdns->otg_v0_regs->simulate);  in cdns3_drd_init()
264 		dev_info(cdns->dev, "DRD version v0 (%08x)\n",  in cdns3_drd_init()
265 			 readl(&cdns->otg_v0_regs->version));  in cdns3_drd_init()
267 		cdns->otg_v0_regs = NULL;  in cdns3_drd_init()
268 		cdns->otg_v1_regs = regs;  in cdns3_drd_init()
269 		cdns->otg_regs = (void *)&cdns->otg_v1_regs->cmd;  in cdns3_drd_init()
270 		cdns->version  = CDNS3_CONTROLLER_V1;  in cdns3_drd_init()
271 		writel(1, &cdns->otg_v1_regs->simulate);  in cdns3_drd_init()
272 		dev_info(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",  in cdns3_drd_init()
273 			 readl(&cdns->otg_v1_regs->did),  in cdns3_drd_init()
274 			 readl(&cdns->otg_v1_regs->rid));  in cdns3_drd_init()
277 	state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));  in cdns3_drd_init()
280 	cdns->dr_mode = USB_DR_MODE_OTG;  in cdns3_drd_init()
282 		dev_dbg(cdns->dev, "Controller strapped to HOST\n");  in cdns3_drd_init()
283 		cdns->dr_mode = USB_DR_MODE_HOST;  in cdns3_drd_init()
285 		dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");  in cdns3_drd_init()
286 		cdns->dr_mode = USB_DR_MODE_PERIPHERAL;  in cdns3_drd_init()
289 	state = readl(&cdns->otg_regs->sts);  in cdns3_drd_init()
291 		dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");  in cdns3_drd_init()
292 		return -ENODEV;  in cdns3_drd_init()