1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * drd.c - DesignWare USB3 DRD Controller Dual-role support
4 *
5 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com
6 *
7 * Authors: Roger Quadros <rogerq@ti.com>
8 */
9
10 #include <linux/extcon.h>
11 #include <linux/of_platform.h>
12 #include <linux/platform_device.h>
13 #include <linux/property.h>
14
15 #include "debug.h"
16 #include "core.h"
17 #include "gadget.h"
18
dwc3_otg_disable_events(struct dwc3 * dwc,u32 disable_mask)19 static void dwc3_otg_disable_events(struct dwc3 *dwc, u32 disable_mask)
20 {
21 u32 reg = dwc3_readl(dwc->regs, DWC3_OEVTEN);
22
23 reg &= ~(disable_mask);
24 dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
25 }
26
dwc3_otg_enable_events(struct dwc3 * dwc,u32 enable_mask)27 static void dwc3_otg_enable_events(struct dwc3 *dwc, u32 enable_mask)
28 {
29 u32 reg = dwc3_readl(dwc->regs, DWC3_OEVTEN);
30
31 reg |= (enable_mask);
32 dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
33 }
34
dwc3_otg_clear_events(struct dwc3 * dwc)35 static void dwc3_otg_clear_events(struct dwc3 *dwc)
36 {
37 u32 reg = dwc3_readl(dwc->regs, DWC3_OEVT);
38
39 dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
40 }
41
42 #define DWC3_OTG_ALL_EVENTS (DWC3_OEVTEN_XHCIRUNSTPSETEN | \
43 DWC3_OEVTEN_DEVRUNSTPSETEN | DWC3_OEVTEN_HIBENTRYEN | \
44 DWC3_OEVTEN_CONIDSTSCHNGEN | DWC3_OEVTEN_HRRCONFNOTIFEN | \
45 DWC3_OEVTEN_HRRINITNOTIFEN | DWC3_OEVTEN_ADEVIDLEEN | \
46 DWC3_OEVTEN_ADEVBHOSTENDEN | DWC3_OEVTEN_ADEVHOSTEN | \
47 DWC3_OEVTEN_ADEVHNPCHNGEN | DWC3_OEVTEN_ADEVSRPDETEN | \
48 DWC3_OEVTEN_ADEVSESSENDDETEN | DWC3_OEVTEN_BDEVBHOSTENDEN | \
49 DWC3_OEVTEN_BDEVHNPCHNGEN | DWC3_OEVTEN_BDEVSESSVLDDETEN | \
50 DWC3_OEVTEN_BDEVVBUSCHNGEN)
51
dwc3_otg_thread_irq(int irq,void * _dwc)52 static irqreturn_t dwc3_otg_thread_irq(int irq, void *_dwc)
53 {
54 struct dwc3 *dwc = _dwc;
55
56 spin_lock(&dwc->lock);
57 if (dwc->otg_restart_host) {
58 dwc3_otg_host_init(dwc);
59 dwc->otg_restart_host = false;
60 }
61
62 spin_unlock(&dwc->lock);
63
64 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
65
66 return IRQ_HANDLED;
67 }
68
dwc3_otg_irq(int irq,void * _dwc)69 static irqreturn_t dwc3_otg_irq(int irq, void *_dwc)
70 {
71 u32 reg;
72 struct dwc3 *dwc = _dwc;
73 irqreturn_t ret = IRQ_NONE;
74
75 reg = dwc3_readl(dwc->regs, DWC3_OEVT);
76 if (reg) {
77 /* ignore non OTG events, we can't disable them in OEVTEN */
78 if (!(reg & DWC3_OTG_ALL_EVENTS)) {
79 dwc3_writel(dwc->regs, DWC3_OEVT, reg);
80 return IRQ_NONE;
81 }
82
83 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST &&
84 !(reg & DWC3_OEVT_DEVICEMODE))
85 dwc->otg_restart_host = true;
86 dwc3_writel(dwc->regs, DWC3_OEVT, reg);
87 ret = IRQ_WAKE_THREAD;
88 }
89
90 return ret;
91 }
92
dwc3_otgregs_init(struct dwc3 * dwc)93 static void dwc3_otgregs_init(struct dwc3 *dwc)
94 {
95 u32 reg;
96
97 /*
98 * Prevent host/device reset from resetting OTG core.
99 * If we don't do this then xhci_reset (USBCMD.HCRST) will reset
100 * the signal outputs sent to the PHY, the OTG FSM logic of the
101 * core and also the resets to the VBUS filters inside the core.
102 */
103 reg = dwc3_readl(dwc->regs, DWC3_OCFG);
104 reg |= DWC3_OCFG_SFTRSTMASK;
105 dwc3_writel(dwc->regs, DWC3_OCFG, reg);
106
107 /* Disable hibernation for simplicity */
108 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
109 reg &= ~DWC3_GCTL_GBLHIBERNATIONEN;
110 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
111
112 /*
113 * Initialize OTG registers as per
114 * Figure 11-4 OTG Driver Overall Programming Flow
115 */
116 /* OCFG.SRPCap = 0, OCFG.HNPCap = 0 */
117 reg = dwc3_readl(dwc->regs, DWC3_OCFG);
118 reg &= ~(DWC3_OCFG_SRPCAP | DWC3_OCFG_HNPCAP);
119 dwc3_writel(dwc->regs, DWC3_OCFG, reg);
120 /* OEVT = FFFF */
121 dwc3_otg_clear_events(dwc);
122 /* OEVTEN = 0 */
123 dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
124 /* OEVTEN.ConIDStsChngEn = 1. Instead we enable all events */
125 dwc3_otg_enable_events(dwc, DWC3_OTG_ALL_EVENTS);
126 /*
127 * OCTL.PeriMode = 1, OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0,
128 * OCTL.HNPReq = 0
129 */
130 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
131 reg |= DWC3_OCTL_PERIMODE;
132 reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN |
133 DWC3_OCTL_HNPREQ);
134 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
135 }
136
dwc3_otg_get_irq(struct dwc3 * dwc)137 static int dwc3_otg_get_irq(struct dwc3 *dwc)
138 {
139 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
140 int irq;
141
142 irq = platform_get_irq_byname_optional(dwc3_pdev, "otg");
143 if (irq > 0)
144 goto out;
145
146 if (irq == -EPROBE_DEFER)
147 goto out;
148
149 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
150 if (irq > 0)
151 goto out;
152
153 if (irq == -EPROBE_DEFER)
154 goto out;
155
156 irq = platform_get_irq(dwc3_pdev, 0);
157 if (irq > 0)
158 goto out;
159
160 if (!irq)
161 irq = -EINVAL;
162
163 out:
164 return irq;
165 }
166
dwc3_otg_init(struct dwc3 * dwc)167 void dwc3_otg_init(struct dwc3 *dwc)
168 {
169 u32 reg;
170
171 /*
172 * As per Figure 11-4 OTG Driver Overall Programming Flow,
173 * block "Initialize GCTL for OTG operation".
174 */
175 /* GCTL.PrtCapDir=2'b11 */
176 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
177 /* GUSB2PHYCFG0.SusPHY=0 */
178 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
179 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
180 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
181
182 /* Initialize OTG registers */
183 dwc3_otgregs_init(dwc);
184 }
185
dwc3_otg_exit(struct dwc3 * dwc)186 void dwc3_otg_exit(struct dwc3 *dwc)
187 {
188 /* disable all OTG IRQs */
189 dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
190 /* clear all events */
191 dwc3_otg_clear_events(dwc);
192 }
193
194 /* should be called before Host controller driver is started */
dwc3_otg_host_init(struct dwc3 * dwc)195 void dwc3_otg_host_init(struct dwc3 *dwc)
196 {
197 u32 reg;
198
199 /* As per Figure 11-10 A-Device Flow Diagram */
200 /* OCFG.HNPCap = 0, OCFG.SRPCap = 0. Already 0 */
201
202 /*
203 * OCTL.PeriMode=0, OCTL.TermSelDLPulse = 0,
204 * OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
205 */
206 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
207 reg &= ~(DWC3_OCTL_PERIMODE | DWC3_OCTL_TERMSELIDPULSE |
208 DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
209 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
210
211 /*
212 * OCFG.DisPrtPwrCutoff = 0/1
213 */
214 reg = dwc3_readl(dwc->regs, DWC3_OCFG);
215 reg &= ~DWC3_OCFG_DISPWRCUTTOFF;
216 dwc3_writel(dwc->regs, DWC3_OCFG, reg);
217
218 /*
219 * OCFG.SRPCap = 1, OCFG.HNPCap = GHWPARAMS6.HNP_CAP
220 * We don't want SRP/HNP for simple dual-role so leave
221 * these disabled.
222 */
223
224 /*
225 * OEVTEN.OTGADevHostEvntEn = 1
226 * OEVTEN.OTGADevSessEndDetEvntEn = 1
227 * We don't want HNP/role-swap so leave these disabled.
228 */
229
230 /* GUSB2PHYCFG.ULPIAutoRes = 1/0, GUSB2PHYCFG.SusPHY = 1 */
231 if (!dwc->dis_u2_susphy_quirk) {
232 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
233 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
234 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
235 }
236
237 /* Set Port Power to enable VBUS: OCTL.PrtPwrCtl = 1 */
238 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
239 reg |= DWC3_OCTL_PRTPWRCTL;
240 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
241 }
242
243 /* should be called after Host controller driver is stopped */
dwc3_otg_host_exit(struct dwc3 * dwc)244 static void dwc3_otg_host_exit(struct dwc3 *dwc)
245 {
246 u32 reg;
247
248 /*
249 * Exit from A-device flow as per
250 * Figure 11-4 OTG Driver Overall Programming Flow
251 */
252
253 /*
254 * OEVTEN.OTGADevBHostEndEvntEn=0, OEVTEN.OTGADevHNPChngEvntEn=0
255 * OEVTEN.OTGADevSessEndDetEvntEn=0,
256 * OEVTEN.OTGADevHostEvntEn = 0
257 * But we don't disable any OTG events
258 */
259
260 /* OCTL.HstSetHNPEn = 0, OCTL.PrtPwrCtl=0 */
261 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
262 reg &= ~(DWC3_OCTL_HSTSETHNPEN | DWC3_OCTL_PRTPWRCTL);
263 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
264 }
265
266 /* should be called before the gadget controller driver is started */
dwc3_otg_device_init(struct dwc3 * dwc)267 static void dwc3_otg_device_init(struct dwc3 *dwc)
268 {
269 u32 reg;
270
271 /* As per Figure 11-20 B-Device Flow Diagram */
272
273 /*
274 * OCFG.HNPCap = GHWPARAMS6.HNP_CAP, OCFG.SRPCap = 1
275 * but we keep them 0 for simple dual-role operation.
276 */
277 reg = dwc3_readl(dwc->regs, DWC3_OCFG);
278 /* OCFG.OTGSftRstMsk = 0/1 */
279 reg |= DWC3_OCFG_SFTRSTMASK;
280 dwc3_writel(dwc->regs, DWC3_OCFG, reg);
281 /*
282 * OCTL.PeriMode = 1
283 * OCTL.TermSelDLPulse = 0/1, OCTL.HNPReq = 0
284 * OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
285 */
286 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
287 reg |= DWC3_OCTL_PERIMODE;
288 reg &= ~(DWC3_OCTL_TERMSELIDPULSE | DWC3_OCTL_HNPREQ |
289 DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
290 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
291 /* OEVTEN.OTGBDevSesVldDetEvntEn = 1 */
292 dwc3_otg_enable_events(dwc, DWC3_OEVTEN_BDEVSESSVLDDETEN);
293 /* GUSB2PHYCFG.ULPIAutoRes = 0, GUSB2PHYCFG0.SusPHY = 1 */
294 if (!dwc->dis_u2_susphy_quirk) {
295 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
296 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
297 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
298 }
299 /* GCTL.GblHibernationEn = 0. Already 0. */
300 }
301
302 /* should be called after the gadget controller driver is stopped */
dwc3_otg_device_exit(struct dwc3 * dwc)303 static void dwc3_otg_device_exit(struct dwc3 *dwc)
304 {
305 u32 reg;
306
307 /*
308 * Exit from B-device flow as per
309 * Figure 11-4 OTG Driver Overall Programming Flow
310 */
311
312 /*
313 * OEVTEN.OTGBDevHNPChngEvntEn = 0
314 * OEVTEN.OTGBDevVBusChngEvntEn = 0
315 * OEVTEN.OTGBDevBHostEndEvntEn = 0
316 */
317 dwc3_otg_disable_events(dwc, DWC3_OEVTEN_BDEVHNPCHNGEN |
318 DWC3_OEVTEN_BDEVVBUSCHNGEN |
319 DWC3_OEVTEN_BDEVBHOSTENDEN);
320
321 /* OCTL.DevSetHNPEn = 0, OCTL.HNPReq = 0, OCTL.PeriMode=1 */
322 reg = dwc3_readl(dwc->regs, DWC3_OCTL);
323 reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HNPREQ);
324 reg |= DWC3_OCTL_PERIMODE;
325 dwc3_writel(dwc->regs, DWC3_OCTL, reg);
326 }
327
dwc3_otg_update(struct dwc3 * dwc,bool ignore_idstatus)328 void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
329 {
330 int ret;
331 u32 reg;
332 int id;
333 unsigned long flags;
334 int i;
335
336 if (dwc->dr_mode != USB_DR_MODE_OTG)
337 return;
338
339 /* don't do anything if debug user changed role to not OTG */
340 if (dwc->current_dr_role != DWC3_GCTL_PRTCAP_OTG)
341 return;
342
343 if (!ignore_idstatus) {
344 reg = dwc3_readl(dwc->regs, DWC3_OSTS);
345 id = !!(reg & DWC3_OSTS_CONIDSTS);
346
347 dwc->desired_otg_role = id ? DWC3_OTG_ROLE_DEVICE :
348 DWC3_OTG_ROLE_HOST;
349 }
350
351 if (dwc->desired_otg_role == dwc->current_otg_role)
352 return;
353
354 switch (dwc->current_otg_role) {
355 case DWC3_OTG_ROLE_HOST:
356 dwc3_host_exit(dwc);
357 spin_lock_irqsave(&dwc->lock, flags);
358 dwc3_otg_host_exit(dwc);
359 spin_unlock_irqrestore(&dwc->lock, flags);
360 break;
361 case DWC3_OTG_ROLE_DEVICE:
362 dwc3_gadget_exit(dwc);
363 spin_lock_irqsave(&dwc->lock, flags);
364 dwc3_event_buffers_cleanup(dwc);
365 dwc3_otg_device_exit(dwc);
366 spin_unlock_irqrestore(&dwc->lock, flags);
367 break;
368 default:
369 break;
370 }
371
372 spin_lock_irqsave(&dwc->lock, flags);
373
374 dwc->current_otg_role = dwc->desired_otg_role;
375
376 spin_unlock_irqrestore(&dwc->lock, flags);
377
378 switch (dwc->desired_otg_role) {
379 case DWC3_OTG_ROLE_HOST:
380 spin_lock_irqsave(&dwc->lock, flags);
381 dwc3_otgregs_init(dwc);
382 dwc3_otg_host_init(dwc);
383 spin_unlock_irqrestore(&dwc->lock, flags);
384 ret = dwc3_host_init(dwc);
385 if (ret) {
386 dev_err(dwc->dev, "failed to initialize host\n");
387 } else {
388 if (dwc->usb2_phy)
389 otg_set_vbus(dwc->usb2_phy->otg, true);
390 for (i = 0; i < dwc->num_usb2_ports; i++) {
391 if (dwc->usb2_generic_phy[i]) {
392 phy_set_mode(dwc->usb2_generic_phy[i],
393 PHY_MODE_USB_HOST);
394 }
395 }
396 }
397 break;
398 case DWC3_OTG_ROLE_DEVICE:
399 spin_lock_irqsave(&dwc->lock, flags);
400 dwc3_otgregs_init(dwc);
401 dwc3_otg_device_init(dwc);
402 dwc3_event_buffers_setup(dwc);
403 spin_unlock_irqrestore(&dwc->lock, flags);
404
405 if (dwc->usb2_phy)
406 otg_set_vbus(dwc->usb2_phy->otg, false);
407 if (dwc->usb2_generic_phy[0])
408 phy_set_mode(dwc->usb2_generic_phy[0], PHY_MODE_USB_DEVICE);
409 ret = dwc3_gadget_init(dwc);
410 if (ret)
411 dev_err(dwc->dev, "failed to initialize peripheral\n");
412 break;
413 default:
414 break;
415 }
416 }
417
dwc3_drd_update(struct dwc3 * dwc)418 static void dwc3_drd_update(struct dwc3 *dwc)
419 {
420 int id;
421
422 if (dwc->edev) {
423 id = extcon_get_state(dwc->edev, EXTCON_USB_HOST);
424 if (id < 0)
425 id = 0;
426 dwc3_set_mode(dwc, id ?
427 DWC3_GCTL_PRTCAP_HOST :
428 DWC3_GCTL_PRTCAP_DEVICE);
429 }
430 }
431
dwc3_drd_notifier(struct notifier_block * nb,unsigned long event,void * ptr)432 static int dwc3_drd_notifier(struct notifier_block *nb,
433 unsigned long event, void *ptr)
434 {
435 struct dwc3 *dwc = container_of(nb, struct dwc3, edev_nb);
436
437 dwc3_set_mode(dwc, event ?
438 DWC3_GCTL_PRTCAP_HOST :
439 DWC3_GCTL_PRTCAP_DEVICE);
440
441 return NOTIFY_DONE;
442 }
443
444 #if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
445 #define ROLE_SWITCH 1
dwc3_usb_role_switch_set(struct usb_role_switch * sw,enum usb_role role)446 static int dwc3_usb_role_switch_set(struct usb_role_switch *sw,
447 enum usb_role role)
448 {
449 struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
450 u32 mode;
451
452 switch (role) {
453 case USB_ROLE_HOST:
454 mode = DWC3_GCTL_PRTCAP_HOST;
455 break;
456 case USB_ROLE_DEVICE:
457 mode = DWC3_GCTL_PRTCAP_DEVICE;
458 break;
459 default:
460 if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
461 mode = DWC3_GCTL_PRTCAP_HOST;
462 else
463 mode = DWC3_GCTL_PRTCAP_DEVICE;
464 break;
465 }
466
467 dwc3_set_mode(dwc, mode);
468 return 0;
469 }
470
dwc3_usb_role_switch_get(struct usb_role_switch * sw)471 static enum usb_role dwc3_usb_role_switch_get(struct usb_role_switch *sw)
472 {
473 struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
474 unsigned long flags;
475 enum usb_role role;
476
477 spin_lock_irqsave(&dwc->lock, flags);
478 switch (dwc->current_dr_role) {
479 case DWC3_GCTL_PRTCAP_HOST:
480 role = USB_ROLE_HOST;
481 break;
482 case DWC3_GCTL_PRTCAP_DEVICE:
483 role = USB_ROLE_DEVICE;
484 break;
485 case DWC3_GCTL_PRTCAP_OTG:
486 role = dwc->current_otg_role;
487 break;
488 default:
489 if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
490 role = USB_ROLE_HOST;
491 else
492 role = USB_ROLE_DEVICE;
493 break;
494 }
495 spin_unlock_irqrestore(&dwc->lock, flags);
496 return role;
497 }
498
dwc3_setup_role_switch(struct dwc3 * dwc)499 static int dwc3_setup_role_switch(struct dwc3 *dwc)
500 {
501 struct usb_role_switch_desc dwc3_role_switch = {NULL};
502 u32 mode;
503
504 dwc->role_switch_default_mode = usb_get_role_switch_default_mode(dwc->dev);
505 if (dwc->role_switch_default_mode == USB_DR_MODE_HOST) {
506 mode = DWC3_GCTL_PRTCAP_HOST;
507 } else {
508 dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
509 mode = DWC3_GCTL_PRTCAP_DEVICE;
510 }
511 dwc3_set_mode(dwc, mode);
512
513 dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
514 dwc3_role_switch.set = dwc3_usb_role_switch_set;
515 dwc3_role_switch.get = dwc3_usb_role_switch_get;
516 dwc3_role_switch.driver_data = dwc;
517 dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
518 if (IS_ERR(dwc->role_sw))
519 return PTR_ERR(dwc->role_sw);
520
521 if (dwc->dev->of_node) {
522 /* populate connector entry */
523 int ret = devm_of_platform_populate(dwc->dev);
524
525 if (ret) {
526 usb_role_switch_unregister(dwc->role_sw);
527 dwc->role_sw = NULL;
528 dev_err(dwc->dev, "DWC3 platform devices creation failed: %i\n", ret);
529 return ret;
530 }
531 }
532
533 return 0;
534 }
535 #else
536 #define ROLE_SWITCH 0
537 #define dwc3_setup_role_switch(x) 0
538 #endif
539
dwc3_drd_init(struct dwc3 * dwc)540 int dwc3_drd_init(struct dwc3 *dwc)
541 {
542 int ret, irq;
543
544 if (ROLE_SWITCH &&
545 device_property_read_bool(dwc->dev, "usb-role-switch"))
546 return dwc3_setup_role_switch(dwc);
547
548 if (dwc->edev) {
549 dwc->edev_nb.notifier_call = dwc3_drd_notifier;
550 ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
551 &dwc->edev_nb);
552 if (ret < 0) {
553 dev_err(dwc->dev, "couldn't register cable notifier\n");
554 return ret;
555 }
556
557 dwc3_drd_update(dwc);
558 } else {
559 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
560
561 /* use OTG block to get ID event */
562 irq = dwc3_otg_get_irq(dwc);
563 if (irq < 0)
564 return irq;
565
566 dwc->otg_irq = irq;
567
568 /* disable all OTG IRQs */
569 dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
570 /* clear all events */
571 dwc3_otg_clear_events(dwc);
572
573 ret = request_threaded_irq(dwc->otg_irq, dwc3_otg_irq,
574 dwc3_otg_thread_irq,
575 IRQF_SHARED, "dwc3-otg", dwc);
576 if (ret) {
577 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
578 dwc->otg_irq, ret);
579 ret = -ENODEV;
580 return ret;
581 }
582
583 dwc3_otg_init(dwc);
584 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
585 }
586
587 return 0;
588 }
589
dwc3_drd_exit(struct dwc3 * dwc)590 void dwc3_drd_exit(struct dwc3 *dwc)
591 {
592 unsigned long flags;
593
594 if (dwc->role_sw)
595 usb_role_switch_unregister(dwc->role_sw);
596
597 if (dwc->edev)
598 extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
599 &dwc->edev_nb);
600
601 cancel_work_sync(&dwc->drd_work);
602
603 /* debug user might have changed role, clean based on current role */
604 switch (dwc->current_dr_role) {
605 case DWC3_GCTL_PRTCAP_HOST:
606 dwc3_host_exit(dwc);
607 break;
608 case DWC3_GCTL_PRTCAP_DEVICE:
609 dwc3_gadget_exit(dwc);
610 dwc3_event_buffers_cleanup(dwc);
611 break;
612 case DWC3_GCTL_PRTCAP_OTG:
613 dwc3_otg_exit(dwc);
614 spin_lock_irqsave(&dwc->lock, flags);
615 dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
616 spin_unlock_irqrestore(&dwc->lock, flags);
617 dwc3_otg_update(dwc, 1);
618 break;
619 default:
620 break;
621 }
622
623 if (dwc->otg_irq)
624 free_irq(dwc->otg_irq, dwc);
625 }
626