]> git.ipfire.org Git - thirdparty/linux.git/blob - drivers/usb/dwc3/gadget.c
io_uring: reset -EBUSY error when io sq thread is waken up
[thirdparty/linux.git] / drivers / usb / dwc3 / gadget.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
4 *
5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
6 *
7 * Authors: Felipe Balbi <balbi@ti.com>,
8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/list.h>
20 #include <linux/dma-mapping.h>
21
22 #include <linux/usb/ch9.h>
23 #include <linux/usb/gadget.h>
24
25 #include "debug.h"
26 #include "core.h"
27 #include "gadget.h"
28 #include "io.h"
29
30 #define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \
31 & ~((d)->interval - 1))
32
33 /**
34 * dwc3_gadget_set_test_mode - enables usb2 test modes
35 * @dwc: pointer to our context structure
36 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
37 *
38 * Caller should take care of locking. This function will return 0 on
39 * success or -EINVAL if wrong Test Selector is passed.
40 */
41 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
42 {
43 u32 reg;
44
45 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
46 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
47
48 switch (mode) {
49 case TEST_J:
50 case TEST_K:
51 case TEST_SE0_NAK:
52 case TEST_PACKET:
53 case TEST_FORCE_EN:
54 reg |= mode << 1;
55 break;
56 default:
57 return -EINVAL;
58 }
59
60 dwc3_gadget_dctl_write_safe(dwc, reg);
61
62 return 0;
63 }
64
65 /**
66 * dwc3_gadget_get_link_state - gets current state of usb link
67 * @dwc: pointer to our context structure
68 *
69 * Caller should take care of locking. This function will
70 * return the link state on success (>= 0) or -ETIMEDOUT.
71 */
72 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
73 {
74 u32 reg;
75
76 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
77
78 return DWC3_DSTS_USBLNKST(reg);
79 }
80
81 /**
82 * dwc3_gadget_set_link_state - sets usb link to a particular state
83 * @dwc: pointer to our context structure
84 * @state: the state to put link into
85 *
86 * Caller should take care of locking. This function will
87 * return 0 on success or -ETIMEDOUT.
88 */
89 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
90 {
91 int retries = 10000;
92 u32 reg;
93
94 /*
95 * Wait until device controller is ready. Only applies to 1.94a and
96 * later RTL.
97 */
98 if (dwc->revision >= DWC3_REVISION_194A) {
99 while (--retries) {
100 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
101 if (reg & DWC3_DSTS_DCNRD)
102 udelay(5);
103 else
104 break;
105 }
106
107 if (retries <= 0)
108 return -ETIMEDOUT;
109 }
110
111 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
112 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
113
114 /* set no action before sending new link state change */
115 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
116
117 /* set requested state */
118 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
119 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
120
121 /*
122 * The following code is racy when called from dwc3_gadget_wakeup,
123 * and is not needed, at least on newer versions
124 */
125 if (dwc->revision >= DWC3_REVISION_194A)
126 return 0;
127
128 /* wait for a change in DSTS */
129 retries = 10000;
130 while (--retries) {
131 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
132
133 if (DWC3_DSTS_USBLNKST(reg) == state)
134 return 0;
135
136 udelay(5);
137 }
138
139 return -ETIMEDOUT;
140 }
141
142 /**
143 * dwc3_ep_inc_trb - increment a trb index.
144 * @index: Pointer to the TRB index to increment.
145 *
146 * The index should never point to the link TRB. After incrementing,
147 * if it is point to the link TRB, wrap around to the beginning. The
148 * link TRB is always at the last TRB entry.
149 */
150 static void dwc3_ep_inc_trb(u8 *index)
151 {
152 (*index)++;
153 if (*index == (DWC3_TRB_NUM - 1))
154 *index = 0;
155 }
156
157 /**
158 * dwc3_ep_inc_enq - increment endpoint's enqueue pointer
159 * @dep: The endpoint whose enqueue pointer we're incrementing
160 */
161 static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
162 {
163 dwc3_ep_inc_trb(&dep->trb_enqueue);
164 }
165
166 /**
167 * dwc3_ep_inc_deq - increment endpoint's dequeue pointer
168 * @dep: The endpoint whose enqueue pointer we're incrementing
169 */
170 static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
171 {
172 dwc3_ep_inc_trb(&dep->trb_dequeue);
173 }
174
175 static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,
176 struct dwc3_request *req, int status)
177 {
178 struct dwc3 *dwc = dep->dwc;
179
180 list_del(&req->list);
181 req->remaining = 0;
182 req->needs_extra_trb = false;
183
184 if (req->request.status == -EINPROGRESS)
185 req->request.status = status;
186
187 if (req->trb)
188 usb_gadget_unmap_request_by_dev(dwc->sysdev,
189 &req->request, req->direction);
190
191 req->trb = NULL;
192 trace_dwc3_gadget_giveback(req);
193
194 if (dep->number > 1)
195 pm_runtime_put(dwc->dev);
196 }
197
198 /**
199 * dwc3_gadget_giveback - call struct usb_request's ->complete callback
200 * @dep: The endpoint to whom the request belongs to
201 * @req: The request we're giving back
202 * @status: completion code for the request
203 *
204 * Must be called with controller's lock held and interrupts disabled. This
205 * function will unmap @req and call its ->complete() callback to notify upper
206 * layers that it has completed.
207 */
208 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
209 int status)
210 {
211 struct dwc3 *dwc = dep->dwc;
212
213 dwc3_gadget_del_and_unmap_request(dep, req, status);
214 req->status = DWC3_REQUEST_STATUS_COMPLETED;
215
216 spin_unlock(&dwc->lock);
217 usb_gadget_giveback_request(&dep->endpoint, &req->request);
218 spin_lock(&dwc->lock);
219 }
220
221 /**
222 * dwc3_send_gadget_generic_command - issue a generic command for the controller
223 * @dwc: pointer to the controller context
224 * @cmd: the command to be issued
225 * @param: command parameter
226 *
227 * Caller should take care of locking. Issue @cmd with a given @param to @dwc
228 * and wait for its completion.
229 */
230 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
231 {
232 u32 timeout = 500;
233 int status = 0;
234 int ret = 0;
235 u32 reg;
236
237 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
238 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
239
240 do {
241 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
242 if (!(reg & DWC3_DGCMD_CMDACT)) {
243 status = DWC3_DGCMD_STATUS(reg);
244 if (status)
245 ret = -EINVAL;
246 break;
247 }
248 } while (--timeout);
249
250 if (!timeout) {
251 ret = -ETIMEDOUT;
252 status = -ETIMEDOUT;
253 }
254
255 trace_dwc3_gadget_generic_cmd(cmd, param, status);
256
257 return ret;
258 }
259
260 static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
261
262 /**
263 * dwc3_send_gadget_ep_cmd - issue an endpoint command
264 * @dep: the endpoint to which the command is going to be issued
265 * @cmd: the command to be issued
266 * @params: parameters to the command
267 *
268 * Caller should handle locking. This function will issue @cmd with given
269 * @params to @dep and wait for its completion.
270 */
271 int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
272 struct dwc3_gadget_ep_cmd_params *params)
273 {
274 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
275 struct dwc3 *dwc = dep->dwc;
276 u32 timeout = 1000;
277 u32 saved_config = 0;
278 u32 reg;
279
280 int cmd_status = 0;
281 int ret = -EINVAL;
282
283 /*
284 * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
285 * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an
286 * endpoint command.
287 *
288 * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY
289 * settings. Restore them after the command is completed.
290 *
291 * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2
292 */
293 if (dwc->gadget.speed <= USB_SPEED_HIGH) {
294 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
295 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
296 saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;
297 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
298 }
299
300 if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {
301 saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;
302 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
303 }
304
305 if (saved_config)
306 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
307 }
308
309 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
310 int needs_wakeup;
311
312 needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
313 dwc->link_state == DWC3_LINK_STATE_U2 ||
314 dwc->link_state == DWC3_LINK_STATE_U3);
315
316 if (unlikely(needs_wakeup)) {
317 ret = __dwc3_gadget_wakeup(dwc);
318 dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
319 ret);
320 }
321 }
322
323 dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
324 dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
325 dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
326
327 /*
328 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
329 * not relying on XferNotReady, we can make use of a special "No
330 * Response Update Transfer" command where we should clear both CmdAct
331 * and CmdIOC bits.
332 *
333 * With this, we don't need to wait for command completion and can
334 * straight away issue further commands to the endpoint.
335 *
336 * NOTICE: We're making an assumption that control endpoints will never
337 * make use of Update Transfer command. This is a safe assumption
338 * because we can never have more than one request at a time with
339 * Control Endpoints. If anybody changes that assumption, this chunk
340 * needs to be updated accordingly.
341 */
342 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
343 !usb_endpoint_xfer_isoc(desc))
344 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
345 else
346 cmd |= DWC3_DEPCMD_CMDACT;
347
348 dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
349 do {
350 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
351 if (!(reg & DWC3_DEPCMD_CMDACT)) {
352 cmd_status = DWC3_DEPCMD_STATUS(reg);
353
354 switch (cmd_status) {
355 case 0:
356 ret = 0;
357 break;
358 case DEPEVT_TRANSFER_NO_RESOURCE:
359 ret = -EINVAL;
360 break;
361 case DEPEVT_TRANSFER_BUS_EXPIRY:
362 /*
363 * SW issues START TRANSFER command to
364 * isochronous ep with future frame interval. If
365 * future interval time has already passed when
366 * core receives the command, it will respond
367 * with an error status of 'Bus Expiry'.
368 *
369 * Instead of always returning -EINVAL, let's
370 * give a hint to the gadget driver that this is
371 * the case by returning -EAGAIN.
372 */
373 ret = -EAGAIN;
374 break;
375 default:
376 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
377 }
378
379 break;
380 }
381 } while (--timeout);
382
383 if (timeout == 0) {
384 ret = -ETIMEDOUT;
385 cmd_status = -ETIMEDOUT;
386 }
387
388 trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
389
390 if (ret == 0 && DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
391 dep->flags |= DWC3_EP_TRANSFER_STARTED;
392 dwc3_gadget_ep_get_transfer_index(dep);
393 }
394
395 if (saved_config) {
396 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
397 reg |= saved_config;
398 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
399 }
400
401 return ret;
402 }
403
404 static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
405 {
406 struct dwc3 *dwc = dep->dwc;
407 struct dwc3_gadget_ep_cmd_params params;
408 u32 cmd = DWC3_DEPCMD_CLEARSTALL;
409
410 /*
411 * As of core revision 2.60a the recommended programming model
412 * is to set the ClearPendIN bit when issuing a Clear Stall EP
413 * command for IN endpoints. This is to prevent an issue where
414 * some (non-compliant) hosts may not send ACK TPs for pending
415 * IN transfers due to a mishandled error condition. Synopsys
416 * STAR 9000614252.
417 */
418 if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
419 (dwc->gadget.speed >= USB_SPEED_SUPER))
420 cmd |= DWC3_DEPCMD_CLEARPENDIN;
421
422 memset(&params, 0, sizeof(params));
423
424 return dwc3_send_gadget_ep_cmd(dep, cmd, &params);
425 }
426
427 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
428 struct dwc3_trb *trb)
429 {
430 u32 offset = (char *) trb - (char *) dep->trb_pool;
431
432 return dep->trb_pool_dma + offset;
433 }
434
435 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
436 {
437 struct dwc3 *dwc = dep->dwc;
438
439 if (dep->trb_pool)
440 return 0;
441
442 dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
443 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
444 &dep->trb_pool_dma, GFP_KERNEL);
445 if (!dep->trb_pool) {
446 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
447 dep->name);
448 return -ENOMEM;
449 }
450
451 return 0;
452 }
453
454 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
455 {
456 struct dwc3 *dwc = dep->dwc;
457
458 dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
459 dep->trb_pool, dep->trb_pool_dma);
460
461 dep->trb_pool = NULL;
462 dep->trb_pool_dma = 0;
463 }
464
465 static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
466 {
467 struct dwc3_gadget_ep_cmd_params params;
468
469 memset(&params, 0x00, sizeof(params));
470
471 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
472
473 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
474 &params);
475 }
476
477 /**
478 * dwc3_gadget_start_config - configure ep resources
479 * @dep: endpoint that is being enabled
480 *
481 * Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's
482 * completion, it will set Transfer Resource for all available endpoints.
483 *
484 * The assignment of transfer resources cannot perfectly follow the data book
485 * due to the fact that the controller driver does not have all knowledge of the
486 * configuration in advance. It is given this information piecemeal by the
487 * composite gadget framework after every SET_CONFIGURATION and
488 * SET_INTERFACE. Trying to follow the databook programming model in this
489 * scenario can cause errors. For two reasons:
490 *
491 * 1) The databook says to do %DWC3_DEPCMD_DEPSTARTCFG for every
492 * %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is
493 * incorrect in the scenario of multiple interfaces.
494 *
495 * 2) The databook does not mention doing more %DWC3_DEPCMD_DEPXFERCFG for new
496 * endpoint on alt setting (8.1.6).
497 *
498 * The following simplified method is used instead:
499 *
500 * All hardware endpoints can be assigned a transfer resource and this setting
501 * will stay persistent until either a core reset or hibernation. So whenever we
502 * do a %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do
503 * %DWC3_DEPCMD_DEPXFERCFG for every hardware endpoint as well. We are
504 * guaranteed that there are as many transfer resources as endpoints.
505 *
506 * This function is called for each endpoint when it is being enabled but is
507 * triggered only when called for EP0-out, which always happens first, and which
508 * should only happen in one of the above conditions.
509 */
510 static int dwc3_gadget_start_config(struct dwc3_ep *dep)
511 {
512 struct dwc3_gadget_ep_cmd_params params;
513 struct dwc3 *dwc;
514 u32 cmd;
515 int i;
516 int ret;
517
518 if (dep->number)
519 return 0;
520
521 memset(&params, 0x00, sizeof(params));
522 cmd = DWC3_DEPCMD_DEPSTARTCFG;
523 dwc = dep->dwc;
524
525 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
526 if (ret)
527 return ret;
528
529 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
530 struct dwc3_ep *dep = dwc->eps[i];
531
532 if (!dep)
533 continue;
534
535 ret = dwc3_gadget_set_xfer_resource(dep);
536 if (ret)
537 return ret;
538 }
539
540 return 0;
541 }
542
543 static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
544 {
545 const struct usb_ss_ep_comp_descriptor *comp_desc;
546 const struct usb_endpoint_descriptor *desc;
547 struct dwc3_gadget_ep_cmd_params params;
548 struct dwc3 *dwc = dep->dwc;
549
550 comp_desc = dep->endpoint.comp_desc;
551 desc = dep->endpoint.desc;
552
553 memset(&params, 0x00, sizeof(params));
554
555 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
556 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
557
558 /* Burst size is only needed in SuperSpeed mode */
559 if (dwc->gadget.speed >= USB_SPEED_SUPER) {
560 u32 burst = dep->endpoint.maxburst;
561 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
562 }
563
564 params.param0 |= action;
565 if (action == DWC3_DEPCFG_ACTION_RESTORE)
566 params.param2 |= dep->saved_state;
567
568 if (usb_endpoint_xfer_control(desc))
569 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
570
571 if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
572 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
573
574 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
575 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
576 | DWC3_DEPCFG_STREAM_EVENT_EN;
577 dep->stream_capable = true;
578 }
579
580 if (!usb_endpoint_xfer_control(desc))
581 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
582
583 /*
584 * We are doing 1:1 mapping for endpoints, meaning
585 * Physical Endpoints 2 maps to Logical Endpoint 2 and
586 * so on. We consider the direction bit as part of the physical
587 * endpoint number. So USB endpoint 0x81 is 0x03.
588 */
589 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
590
591 /*
592 * We must use the lower 16 TX FIFOs even though
593 * HW might have more
594 */
595 if (dep->direction)
596 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
597
598 if (desc->bInterval) {
599 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
600 dep->interval = 1 << (desc->bInterval - 1);
601 }
602
603 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);
604 }
605
606 /**
607 * __dwc3_gadget_ep_enable - initializes a hw endpoint
608 * @dep: endpoint to be initialized
609 * @action: one of INIT, MODIFY or RESTORE
610 *
611 * Caller should take care of locking. Execute all necessary commands to
612 * initialize a HW endpoint so it can be used by a gadget driver.
613 */
614 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
615 {
616 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
617 struct dwc3 *dwc = dep->dwc;
618
619 u32 reg;
620 int ret;
621
622 if (!(dep->flags & DWC3_EP_ENABLED)) {
623 ret = dwc3_gadget_start_config(dep);
624 if (ret)
625 return ret;
626 }
627
628 ret = dwc3_gadget_set_ep_config(dep, action);
629 if (ret)
630 return ret;
631
632 if (!(dep->flags & DWC3_EP_ENABLED)) {
633 struct dwc3_trb *trb_st_hw;
634 struct dwc3_trb *trb_link;
635
636 dep->type = usb_endpoint_type(desc);
637 dep->flags |= DWC3_EP_ENABLED;
638
639 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
640 reg |= DWC3_DALEPENA_EP(dep->number);
641 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
642
643 if (usb_endpoint_xfer_control(desc))
644 goto out;
645
646 /* Initialize the TRB ring */
647 dep->trb_dequeue = 0;
648 dep->trb_enqueue = 0;
649 memset(dep->trb_pool, 0,
650 sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
651
652 /* Link TRB. The HWO bit is never reset */
653 trb_st_hw = &dep->trb_pool[0];
654
655 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
656 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
657 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
658 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
659 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
660 }
661
662 /*
663 * Issue StartTransfer here with no-op TRB so we can always rely on No
664 * Response Update Transfer command.
665 */
666 if ((usb_endpoint_xfer_bulk(desc) && !dep->stream_capable) ||
667 usb_endpoint_xfer_int(desc)) {
668 struct dwc3_gadget_ep_cmd_params params;
669 struct dwc3_trb *trb;
670 dma_addr_t trb_dma;
671 u32 cmd;
672
673 memset(&params, 0, sizeof(params));
674 trb = &dep->trb_pool[0];
675 trb_dma = dwc3_trb_dma_offset(dep, trb);
676
677 params.param0 = upper_32_bits(trb_dma);
678 params.param1 = lower_32_bits(trb_dma);
679
680 cmd = DWC3_DEPCMD_STARTTRANSFER;
681
682 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
683 if (ret < 0)
684 return ret;
685 }
686
687 out:
688 trace_dwc3_gadget_ep_enable(dep);
689
690 return 0;
691 }
692
693 static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
694 bool interrupt);
695 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
696 {
697 struct dwc3_request *req;
698
699 dwc3_stop_active_transfer(dep, true, false);
700
701 /* - giveback all requests to gadget driver */
702 while (!list_empty(&dep->started_list)) {
703 req = next_request(&dep->started_list);
704
705 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
706 }
707
708 while (!list_empty(&dep->pending_list)) {
709 req = next_request(&dep->pending_list);
710
711 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
712 }
713
714 while (!list_empty(&dep->cancelled_list)) {
715 req = next_request(&dep->cancelled_list);
716
717 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
718 }
719 }
720
721 /**
722 * __dwc3_gadget_ep_disable - disables a hw endpoint
723 * @dep: the endpoint to disable
724 *
725 * This function undoes what __dwc3_gadget_ep_enable did and also removes
726 * requests which are currently being processed by the hardware and those which
727 * are not yet scheduled.
728 *
729 * Caller should take care of locking.
730 */
731 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
732 {
733 struct dwc3 *dwc = dep->dwc;
734 u32 reg;
735
736 trace_dwc3_gadget_ep_disable(dep);
737
738 dwc3_remove_requests(dwc, dep);
739
740 /* make sure HW endpoint isn't stalled */
741 if (dep->flags & DWC3_EP_STALL)
742 __dwc3_gadget_ep_set_halt(dep, 0, false);
743
744 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
745 reg &= ~DWC3_DALEPENA_EP(dep->number);
746 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
747
748 dep->stream_capable = false;
749 dep->type = 0;
750 dep->flags = 0;
751
752 /* Clear out the ep descriptors for non-ep0 */
753 if (dep->number > 1) {
754 dep->endpoint.comp_desc = NULL;
755 dep->endpoint.desc = NULL;
756 }
757
758 return 0;
759 }
760
761 /* -------------------------------------------------------------------------- */
762
763 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
764 const struct usb_endpoint_descriptor *desc)
765 {
766 return -EINVAL;
767 }
768
769 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
770 {
771 return -EINVAL;
772 }
773
774 /* -------------------------------------------------------------------------- */
775
776 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
777 const struct usb_endpoint_descriptor *desc)
778 {
779 struct dwc3_ep *dep;
780 struct dwc3 *dwc;
781 unsigned long flags;
782 int ret;
783
784 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
785 pr_debug("dwc3: invalid parameters\n");
786 return -EINVAL;
787 }
788
789 if (!desc->wMaxPacketSize) {
790 pr_debug("dwc3: missing wMaxPacketSize\n");
791 return -EINVAL;
792 }
793
794 dep = to_dwc3_ep(ep);
795 dwc = dep->dwc;
796
797 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
798 "%s is already enabled\n",
799 dep->name))
800 return 0;
801
802 spin_lock_irqsave(&dwc->lock, flags);
803 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
804 spin_unlock_irqrestore(&dwc->lock, flags);
805
806 return ret;
807 }
808
809 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
810 {
811 struct dwc3_ep *dep;
812 struct dwc3 *dwc;
813 unsigned long flags;
814 int ret;
815
816 if (!ep) {
817 pr_debug("dwc3: invalid parameters\n");
818 return -EINVAL;
819 }
820
821 dep = to_dwc3_ep(ep);
822 dwc = dep->dwc;
823
824 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
825 "%s is already disabled\n",
826 dep->name))
827 return 0;
828
829 spin_lock_irqsave(&dwc->lock, flags);
830 ret = __dwc3_gadget_ep_disable(dep);
831 spin_unlock_irqrestore(&dwc->lock, flags);
832
833 return ret;
834 }
835
836 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
837 gfp_t gfp_flags)
838 {
839 struct dwc3_request *req;
840 struct dwc3_ep *dep = to_dwc3_ep(ep);
841
842 req = kzalloc(sizeof(*req), gfp_flags);
843 if (!req)
844 return NULL;
845
846 req->direction = dep->direction;
847 req->epnum = dep->number;
848 req->dep = dep;
849 req->status = DWC3_REQUEST_STATUS_UNKNOWN;
850
851 trace_dwc3_alloc_request(req);
852
853 return &req->request;
854 }
855
856 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
857 struct usb_request *request)
858 {
859 struct dwc3_request *req = to_dwc3_request(request);
860
861 trace_dwc3_free_request(req);
862 kfree(req);
863 }
864
865 /**
866 * dwc3_ep_prev_trb - returns the previous TRB in the ring
867 * @dep: The endpoint with the TRB ring
868 * @index: The index of the current TRB in the ring
869 *
870 * Returns the TRB prior to the one pointed to by the index. If the
871 * index is 0, we will wrap backwards, skip the link TRB, and return
872 * the one just before that.
873 */
874 static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
875 {
876 u8 tmp = index;
877
878 if (!tmp)
879 tmp = DWC3_TRB_NUM - 1;
880
881 return &dep->trb_pool[tmp - 1];
882 }
883
884 static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
885 {
886 struct dwc3_trb *tmp;
887 u8 trbs_left;
888
889 /*
890 * If enqueue & dequeue are equal than it is either full or empty.
891 *
892 * One way to know for sure is if the TRB right before us has HWO bit
893 * set or not. If it has, then we're definitely full and can't fit any
894 * more transfers in our ring.
895 */
896 if (dep->trb_enqueue == dep->trb_dequeue) {
897 tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
898 if (tmp->ctrl & DWC3_TRB_CTRL_HWO)
899 return 0;
900
901 return DWC3_TRB_NUM - 1;
902 }
903
904 trbs_left = dep->trb_dequeue - dep->trb_enqueue;
905 trbs_left &= (DWC3_TRB_NUM - 1);
906
907 if (dep->trb_dequeue < dep->trb_enqueue)
908 trbs_left--;
909
910 return trbs_left;
911 }
912
913 static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
914 dma_addr_t dma, unsigned length, unsigned chain, unsigned node,
915 unsigned stream_id, unsigned short_not_ok, unsigned no_interrupt)
916 {
917 struct dwc3 *dwc = dep->dwc;
918 struct usb_gadget *gadget = &dwc->gadget;
919 enum usb_device_speed speed = gadget->speed;
920
921 trb->size = DWC3_TRB_SIZE_LENGTH(length);
922 trb->bpl = lower_32_bits(dma);
923 trb->bph = upper_32_bits(dma);
924
925 switch (usb_endpoint_type(dep->endpoint.desc)) {
926 case USB_ENDPOINT_XFER_CONTROL:
927 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
928 break;
929
930 case USB_ENDPOINT_XFER_ISOC:
931 if (!node) {
932 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
933
934 /*
935 * USB Specification 2.0 Section 5.9.2 states that: "If
936 * there is only a single transaction in the microframe,
937 * only a DATA0 data packet PID is used. If there are
938 * two transactions per microframe, DATA1 is used for
939 * the first transaction data packet and DATA0 is used
940 * for the second transaction data packet. If there are
941 * three transactions per microframe, DATA2 is used for
942 * the first transaction data packet, DATA1 is used for
943 * the second, and DATA0 is used for the third."
944 *
945 * IOW, we should satisfy the following cases:
946 *
947 * 1) length <= maxpacket
948 * - DATA0
949 *
950 * 2) maxpacket < length <= (2 * maxpacket)
951 * - DATA1, DATA0
952 *
953 * 3) (2 * maxpacket) < length <= (3 * maxpacket)
954 * - DATA2, DATA1, DATA0
955 */
956 if (speed == USB_SPEED_HIGH) {
957 struct usb_ep *ep = &dep->endpoint;
958 unsigned int mult = 2;
959 unsigned int maxp = usb_endpoint_maxp(ep->desc);
960
961 if (length <= (2 * maxp))
962 mult--;
963
964 if (length <= maxp)
965 mult--;
966
967 trb->size |= DWC3_TRB_SIZE_PCM1(mult);
968 }
969 } else {
970 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
971 }
972
973 /* always enable Interrupt on Missed ISOC */
974 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
975 break;
976
977 case USB_ENDPOINT_XFER_BULK:
978 case USB_ENDPOINT_XFER_INT:
979 trb->ctrl = DWC3_TRBCTL_NORMAL;
980 break;
981 default:
982 /*
983 * This is only possible with faulty memory because we
984 * checked it already :)
985 */
986 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
987 usb_endpoint_type(dep->endpoint.desc));
988 }
989
990 /*
991 * Enable Continue on Short Packet
992 * when endpoint is not a stream capable
993 */
994 if (usb_endpoint_dir_out(dep->endpoint.desc)) {
995 if (!dep->stream_capable)
996 trb->ctrl |= DWC3_TRB_CTRL_CSP;
997
998 if (short_not_ok)
999 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
1000 }
1001
1002 if ((!no_interrupt && !chain) ||
1003 (dwc3_calc_trbs_left(dep) == 1))
1004 trb->ctrl |= DWC3_TRB_CTRL_IOC;
1005
1006 if (chain)
1007 trb->ctrl |= DWC3_TRB_CTRL_CHN;
1008
1009 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
1010 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
1011
1012 trb->ctrl |= DWC3_TRB_CTRL_HWO;
1013
1014 dwc3_ep_inc_enq(dep);
1015
1016 trace_dwc3_prepare_trb(dep, trb);
1017 }
1018
1019 /**
1020 * dwc3_prepare_one_trb - setup one TRB from one request
1021 * @dep: endpoint for which this request is prepared
1022 * @req: dwc3_request pointer
1023 * @chain: should this TRB be chained to the next?
1024 * @node: only for isochronous endpoints. First TRB needs different type.
1025 */
1026 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
1027 struct dwc3_request *req, unsigned chain, unsigned node)
1028 {
1029 struct dwc3_trb *trb;
1030 unsigned int length;
1031 dma_addr_t dma;
1032 unsigned stream_id = req->request.stream_id;
1033 unsigned short_not_ok = req->request.short_not_ok;
1034 unsigned no_interrupt = req->request.no_interrupt;
1035
1036 if (req->request.num_sgs > 0) {
1037 length = sg_dma_len(req->start_sg);
1038 dma = sg_dma_address(req->start_sg);
1039 } else {
1040 length = req->request.length;
1041 dma = req->request.dma;
1042 }
1043
1044 trb = &dep->trb_pool[dep->trb_enqueue];
1045
1046 if (!req->trb) {
1047 dwc3_gadget_move_started_request(req);
1048 req->trb = trb;
1049 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
1050 }
1051
1052 req->num_trbs++;
1053
1054 __dwc3_prepare_one_trb(dep, trb, dma, length, chain, node,
1055 stream_id, short_not_ok, no_interrupt);
1056 }
1057
1058 static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
1059 struct dwc3_request *req)
1060 {
1061 struct scatterlist *sg = req->start_sg;
1062 struct scatterlist *s;
1063 int i;
1064
1065 unsigned int remaining = req->request.num_mapped_sgs
1066 - req->num_queued_sgs;
1067
1068 for_each_sg(sg, s, remaining, i) {
1069 unsigned int length = req->request.length;
1070 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1071 unsigned int rem = length % maxp;
1072 unsigned chain = true;
1073
1074 /*
1075 * IOMMU driver is coalescing the list of sgs which shares a
1076 * page boundary into one and giving it to USB driver. With
1077 * this the number of sgs mapped is not equal to the number of
1078 * sgs passed. So mark the chain bit to false if it isthe last
1079 * mapped sg.
1080 */
1081 if (i == remaining - 1)
1082 chain = false;
1083
1084 if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {
1085 struct dwc3 *dwc = dep->dwc;
1086 struct dwc3_trb *trb;
1087
1088 req->needs_extra_trb = true;
1089
1090 /* prepare normal TRB */
1091 dwc3_prepare_one_trb(dep, req, true, i);
1092
1093 /* Now prepare one extra TRB to align transfer size */
1094 trb = &dep->trb_pool[dep->trb_enqueue];
1095 req->num_trbs++;
1096 __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr,
1097 maxp - rem, false, 1,
1098 req->request.stream_id,
1099 req->request.short_not_ok,
1100 req->request.no_interrupt);
1101 } else {
1102 dwc3_prepare_one_trb(dep, req, chain, i);
1103 }
1104
1105 /*
1106 * There can be a situation where all sgs in sglist are not
1107 * queued because of insufficient trb number. To handle this
1108 * case, update start_sg to next sg to be queued, so that
1109 * we have free trbs we can continue queuing from where we
1110 * previously stopped
1111 */
1112 if (chain)
1113 req->start_sg = sg_next(s);
1114
1115 req->num_queued_sgs++;
1116
1117 if (!dwc3_calc_trbs_left(dep))
1118 break;
1119 }
1120 }
1121
1122 static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
1123 struct dwc3_request *req)
1124 {
1125 unsigned int length = req->request.length;
1126 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1127 unsigned int rem = length % maxp;
1128
1129 if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) {
1130 struct dwc3 *dwc = dep->dwc;
1131 struct dwc3_trb *trb;
1132
1133 req->needs_extra_trb = true;
1134
1135 /* prepare normal TRB */
1136 dwc3_prepare_one_trb(dep, req, true, 0);
1137
1138 /* Now prepare one extra TRB to align transfer size */
1139 trb = &dep->trb_pool[dep->trb_enqueue];
1140 req->num_trbs++;
1141 __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem,
1142 false, 1, req->request.stream_id,
1143 req->request.short_not_ok,
1144 req->request.no_interrupt);
1145 } else if (req->request.zero && req->request.length &&
1146 (IS_ALIGNED(req->request.length, maxp))) {
1147 struct dwc3 *dwc = dep->dwc;
1148 struct dwc3_trb *trb;
1149
1150 req->needs_extra_trb = true;
1151
1152 /* prepare normal TRB */
1153 dwc3_prepare_one_trb(dep, req, true, 0);
1154
1155 /* Now prepare one extra TRB to handle ZLP */
1156 trb = &dep->trb_pool[dep->trb_enqueue];
1157 req->num_trbs++;
1158 __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
1159 false, 1, req->request.stream_id,
1160 req->request.short_not_ok,
1161 req->request.no_interrupt);
1162 } else {
1163 dwc3_prepare_one_trb(dep, req, false, 0);
1164 }
1165 }
1166
1167 /*
1168 * dwc3_prepare_trbs - setup TRBs from requests
1169 * @dep: endpoint for which requests are being prepared
1170 *
1171 * The function goes through the requests list and sets up TRBs for the
1172 * transfers. The function returns once there are no more TRBs available or
1173 * it runs out of requests.
1174 */
1175 static void dwc3_prepare_trbs(struct dwc3_ep *dep)
1176 {
1177 struct dwc3_request *req, *n;
1178
1179 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1180
1181 /*
1182 * We can get in a situation where there's a request in the started list
1183 * but there weren't enough TRBs to fully kick it in the first time
1184 * around, so it has been waiting for more TRBs to be freed up.
1185 *
1186 * In that case, we should check if we have a request with pending_sgs
1187 * in the started list and prepare TRBs for that request first,
1188 * otherwise we will prepare TRBs completely out of order and that will
1189 * break things.
1190 */
1191 list_for_each_entry(req, &dep->started_list, list) {
1192 if (req->num_pending_sgs > 0)
1193 dwc3_prepare_one_trb_sg(dep, req);
1194
1195 if (!dwc3_calc_trbs_left(dep))
1196 return;
1197 }
1198
1199 list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1200 struct dwc3 *dwc = dep->dwc;
1201 int ret;
1202
1203 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1204 dep->direction);
1205 if (ret)
1206 return;
1207
1208 req->sg = req->request.sg;
1209 req->start_sg = req->sg;
1210 req->num_queued_sgs = 0;
1211 req->num_pending_sgs = req->request.num_mapped_sgs;
1212
1213 if (req->num_pending_sgs > 0)
1214 dwc3_prepare_one_trb_sg(dep, req);
1215 else
1216 dwc3_prepare_one_trb_linear(dep, req);
1217
1218 if (!dwc3_calc_trbs_left(dep))
1219 return;
1220 }
1221 }
1222
1223 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
1224 {
1225 struct dwc3_gadget_ep_cmd_params params;
1226 struct dwc3_request *req;
1227 int starting;
1228 int ret;
1229 u32 cmd;
1230
1231 if (!dwc3_calc_trbs_left(dep))
1232 return 0;
1233
1234 starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
1235
1236 dwc3_prepare_trbs(dep);
1237 req = next_request(&dep->started_list);
1238 if (!req) {
1239 dep->flags |= DWC3_EP_PENDING_REQUEST;
1240 return 0;
1241 }
1242
1243 memset(&params, 0, sizeof(params));
1244
1245 if (starting) {
1246 params.param0 = upper_32_bits(req->trb_dma);
1247 params.param1 = lower_32_bits(req->trb_dma);
1248 cmd = DWC3_DEPCMD_STARTTRANSFER;
1249
1250 if (dep->stream_capable)
1251 cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id);
1252
1253 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
1254 cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
1255 } else {
1256 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1257 DWC3_DEPCMD_PARAM(dep->resource_index);
1258 }
1259
1260 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1261 if (ret < 0) {
1262 /*
1263 * FIXME we need to iterate over the list of requests
1264 * here and stop, unmap, free and del each of the linked
1265 * requests instead of what we do now.
1266 */
1267 if (req->trb)
1268 memset(req->trb, 0, sizeof(struct dwc3_trb));
1269 dwc3_gadget_del_and_unmap_request(dep, req, ret);
1270 return ret;
1271 }
1272
1273 return 0;
1274 }
1275
1276 static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1277 {
1278 u32 reg;
1279
1280 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1281 return DWC3_DSTS_SOFFN(reg);
1282 }
1283
1284 /**
1285 * dwc3_gadget_start_isoc_quirk - workaround invalid frame number
1286 * @dep: isoc endpoint
1287 *
1288 * This function tests for the correct combination of BIT[15:14] from the 16-bit
1289 * microframe number reported by the XferNotReady event for the future frame
1290 * number to start the isoc transfer.
1291 *
1292 * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
1293 * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the
1294 * XferNotReady event are invalid. The driver uses this number to schedule the
1295 * isochronous transfer and passes it to the START TRANSFER command. Because
1296 * this number is invalid, the command may fail. If BIT[15:14] matches the
1297 * internal 16-bit microframe, the START TRANSFER command will pass and the
1298 * transfer will start at the scheduled time, if it is off by 1, the command
1299 * will still pass, but the transfer will start 2 seconds in the future. For all
1300 * other conditions, the START TRANSFER command will fail with bus-expiry.
1301 *
1302 * In order to workaround this issue, we can test for the correct combination of
1303 * BIT[15:14] by sending START TRANSFER commands with different values of
1304 * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart
1305 * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status.
1306 * As the result, within the 4 possible combinations for BIT[15:14], there will
1307 * be 2 successful and 2 failure START COMMAND status. One of the 2 successful
1308 * command status will result in a 2-second delay start. The smaller BIT[15:14]
1309 * value is the correct combination.
1310 *
1311 * Since there are only 4 outcomes and the results are ordered, we can simply
1312 * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to
1313 * deduce the smaller successful combination.
1314 *
1315 * Let test0 = test status for combination 'b00 and test1 = test status for 'b01
1316 * of BIT[15:14]. The correct combination is as follow:
1317 *
1318 * if test0 fails and test1 passes, BIT[15:14] is 'b01
1319 * if test0 fails and test1 fails, BIT[15:14] is 'b10
1320 * if test0 passes and test1 fails, BIT[15:14] is 'b11
1321 * if test0 passes and test1 passes, BIT[15:14] is 'b00
1322 *
1323 * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
1324 * endpoints.
1325 */
1326 static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
1327 {
1328 int cmd_status = 0;
1329 bool test0;
1330 bool test1;
1331
1332 while (dep->combo_num < 2) {
1333 struct dwc3_gadget_ep_cmd_params params;
1334 u32 test_frame_number;
1335 u32 cmd;
1336
1337 /*
1338 * Check if we can start isoc transfer on the next interval or
1339 * 4 uframes in the future with BIT[15:14] as dep->combo_num
1340 */
1341 test_frame_number = dep->frame_number & 0x3fff;
1342 test_frame_number |= dep->combo_num << 14;
1343 test_frame_number += max_t(u32, 4, dep->interval);
1344
1345 params.param0 = upper_32_bits(dep->dwc->bounce_addr);
1346 params.param1 = lower_32_bits(dep->dwc->bounce_addr);
1347
1348 cmd = DWC3_DEPCMD_STARTTRANSFER;
1349 cmd |= DWC3_DEPCMD_PARAM(test_frame_number);
1350 cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1351
1352 /* Redo if some other failure beside bus-expiry is received */
1353 if (cmd_status && cmd_status != -EAGAIN) {
1354 dep->start_cmd_status = 0;
1355 dep->combo_num = 0;
1356 return 0;
1357 }
1358
1359 /* Store the first test status */
1360 if (dep->combo_num == 0)
1361 dep->start_cmd_status = cmd_status;
1362
1363 dep->combo_num++;
1364
1365 /*
1366 * End the transfer if the START_TRANSFER command is successful
1367 * to wait for the next XferNotReady to test the command again
1368 */
1369 if (cmd_status == 0) {
1370 dwc3_stop_active_transfer(dep, true, true);
1371 return 0;
1372 }
1373 }
1374
1375 /* test0 and test1 are both completed at this point */
1376 test0 = (dep->start_cmd_status == 0);
1377 test1 = (cmd_status == 0);
1378
1379 if (!test0 && test1)
1380 dep->combo_num = 1;
1381 else if (!test0 && !test1)
1382 dep->combo_num = 2;
1383 else if (test0 && !test1)
1384 dep->combo_num = 3;
1385 else if (test0 && test1)
1386 dep->combo_num = 0;
1387
1388 dep->frame_number &= 0x3fff;
1389 dep->frame_number |= dep->combo_num << 14;
1390 dep->frame_number += max_t(u32, 4, dep->interval);
1391
1392 /* Reinitialize test variables */
1393 dep->start_cmd_status = 0;
1394 dep->combo_num = 0;
1395
1396 return __dwc3_gadget_kick_transfer(dep);
1397 }
1398
1399 static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
1400 {
1401 struct dwc3 *dwc = dep->dwc;
1402 int ret;
1403 int i;
1404
1405 if (list_empty(&dep->pending_list)) {
1406 dep->flags |= DWC3_EP_PENDING_REQUEST;
1407 return -EAGAIN;
1408 }
1409
1410 if (!dwc->dis_start_transfer_quirk && dwc3_is_usb31(dwc) &&
1411 (dwc->revision <= DWC3_USB31_REVISION_160A ||
1412 (dwc->revision == DWC3_USB31_REVISION_170A &&
1413 dwc->version_type >= DWC31_VERSIONTYPE_EA01 &&
1414 dwc->version_type <= DWC31_VERSIONTYPE_EA06))) {
1415
1416 if (dwc->gadget.speed <= USB_SPEED_HIGH && dep->direction)
1417 return dwc3_gadget_start_isoc_quirk(dep);
1418 }
1419
1420 for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
1421 dep->frame_number = DWC3_ALIGN_FRAME(dep, i + 1);
1422
1423 ret = __dwc3_gadget_kick_transfer(dep);
1424 if (ret != -EAGAIN)
1425 break;
1426 }
1427
1428 return ret;
1429 }
1430
1431 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1432 {
1433 struct dwc3 *dwc = dep->dwc;
1434
1435 if (!dep->endpoint.desc) {
1436 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
1437 dep->name);
1438 return -ESHUTDOWN;
1439 }
1440
1441 if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
1442 &req->request, req->dep->name))
1443 return -EINVAL;
1444
1445 if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
1446 "%s: request %pK already in flight\n",
1447 dep->name, &req->request))
1448 return -EINVAL;
1449
1450 pm_runtime_get(dwc->dev);
1451
1452 req->request.actual = 0;
1453 req->request.status = -EINPROGRESS;
1454
1455 trace_dwc3_ep_queue(req);
1456
1457 list_add_tail(&req->list, &dep->pending_list);
1458 req->status = DWC3_REQUEST_STATUS_QUEUED;
1459
1460 /* Start the transfer only after the END_TRANSFER is completed */
1461 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
1462 dep->flags |= DWC3_EP_DELAY_START;
1463 return 0;
1464 }
1465
1466 /*
1467 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1468 * wait for a XferNotReady event so we will know what's the current
1469 * (micro-)frame number.
1470 *
1471 * Without this trick, we are very, very likely gonna get Bus Expiry
1472 * errors which will force us issue EndTransfer command.
1473 */
1474 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1475 if (!(dep->flags & DWC3_EP_PENDING_REQUEST) &&
1476 !(dep->flags & DWC3_EP_TRANSFER_STARTED))
1477 return 0;
1478
1479 if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
1480 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
1481 return __dwc3_gadget_start_isoc(dep);
1482 }
1483 }
1484 }
1485
1486 return __dwc3_gadget_kick_transfer(dep);
1487 }
1488
1489 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1490 gfp_t gfp_flags)
1491 {
1492 struct dwc3_request *req = to_dwc3_request(request);
1493 struct dwc3_ep *dep = to_dwc3_ep(ep);
1494 struct dwc3 *dwc = dep->dwc;
1495
1496 unsigned long flags;
1497
1498 int ret;
1499
1500 spin_lock_irqsave(&dwc->lock, flags);
1501 ret = __dwc3_gadget_ep_queue(dep, req);
1502 spin_unlock_irqrestore(&dwc->lock, flags);
1503
1504 return ret;
1505 }
1506
1507 static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req)
1508 {
1509 int i;
1510
1511 /*
1512 * If request was already started, this means we had to
1513 * stop the transfer. With that we also need to ignore
1514 * all TRBs used by the request, however TRBs can only
1515 * be modified after completion of END_TRANSFER
1516 * command. So what we do here is that we wait for
1517 * END_TRANSFER completion and only after that, we jump
1518 * over TRBs by clearing HWO and incrementing dequeue
1519 * pointer.
1520 */
1521 for (i = 0; i < req->num_trbs; i++) {
1522 struct dwc3_trb *trb;
1523
1524 trb = &dep->trb_pool[dep->trb_dequeue];
1525 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
1526 dwc3_ep_inc_deq(dep);
1527 }
1528
1529 req->num_trbs = 0;
1530 }
1531
1532 static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
1533 {
1534 struct dwc3_request *req;
1535 struct dwc3_request *tmp;
1536
1537 list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
1538 dwc3_gadget_ep_skip_trbs(dep, req);
1539 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1540 }
1541 }
1542
1543 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1544 struct usb_request *request)
1545 {
1546 struct dwc3_request *req = to_dwc3_request(request);
1547 struct dwc3_request *r = NULL;
1548
1549 struct dwc3_ep *dep = to_dwc3_ep(ep);
1550 struct dwc3 *dwc = dep->dwc;
1551
1552 unsigned long flags;
1553 int ret = 0;
1554
1555 trace_dwc3_ep_dequeue(req);
1556
1557 spin_lock_irqsave(&dwc->lock, flags);
1558
1559 list_for_each_entry(r, &dep->pending_list, list) {
1560 if (r == req)
1561 break;
1562 }
1563
1564 if (r != req) {
1565 list_for_each_entry(r, &dep->started_list, list) {
1566 if (r == req)
1567 break;
1568 }
1569 if (r == req) {
1570 /* wait until it is processed */
1571 dwc3_stop_active_transfer(dep, true, true);
1572
1573 if (!r->trb)
1574 goto out0;
1575
1576 dwc3_gadget_move_cancelled_request(req);
1577 if (dep->flags & DWC3_EP_TRANSFER_STARTED)
1578 goto out0;
1579 else
1580 goto out1;
1581 }
1582 dev_err(dwc->dev, "request %pK was not queued to %s\n",
1583 request, ep->name);
1584 ret = -EINVAL;
1585 goto out0;
1586 }
1587
1588 out1:
1589 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1590
1591 out0:
1592 spin_unlock_irqrestore(&dwc->lock, flags);
1593
1594 return ret;
1595 }
1596
1597 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1598 {
1599 struct dwc3_gadget_ep_cmd_params params;
1600 struct dwc3 *dwc = dep->dwc;
1601 int ret;
1602
1603 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1604 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1605 return -EINVAL;
1606 }
1607
1608 memset(&params, 0x00, sizeof(params));
1609
1610 if (value) {
1611 struct dwc3_trb *trb;
1612
1613 unsigned transfer_in_flight;
1614 unsigned started;
1615
1616 if (dep->number > 1)
1617 trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
1618 else
1619 trb = &dwc->ep0_trb[dep->trb_enqueue];
1620
1621 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
1622 started = !list_empty(&dep->started_list);
1623
1624 if (!protocol && ((dep->direction && transfer_in_flight) ||
1625 (!dep->direction && started))) {
1626 return -EAGAIN;
1627 }
1628
1629 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
1630 &params);
1631 if (ret)
1632 dev_err(dwc->dev, "failed to set STALL on %s\n",
1633 dep->name);
1634 else
1635 dep->flags |= DWC3_EP_STALL;
1636 } else {
1637
1638 ret = dwc3_send_clear_stall_ep_cmd(dep);
1639 if (ret)
1640 dev_err(dwc->dev, "failed to clear STALL on %s\n",
1641 dep->name);
1642 else
1643 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1644 }
1645
1646 return ret;
1647 }
1648
1649 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1650 {
1651 struct dwc3_ep *dep = to_dwc3_ep(ep);
1652 struct dwc3 *dwc = dep->dwc;
1653
1654 unsigned long flags;
1655
1656 int ret;
1657
1658 spin_lock_irqsave(&dwc->lock, flags);
1659 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1660 spin_unlock_irqrestore(&dwc->lock, flags);
1661
1662 return ret;
1663 }
1664
1665 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1666 {
1667 struct dwc3_ep *dep = to_dwc3_ep(ep);
1668 struct dwc3 *dwc = dep->dwc;
1669 unsigned long flags;
1670 int ret;
1671
1672 spin_lock_irqsave(&dwc->lock, flags);
1673 dep->flags |= DWC3_EP_WEDGE;
1674
1675 if (dep->number == 0 || dep->number == 1)
1676 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1677 else
1678 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1679 spin_unlock_irqrestore(&dwc->lock, flags);
1680
1681 return ret;
1682 }
1683
1684 /* -------------------------------------------------------------------------- */
1685
1686 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1687 .bLength = USB_DT_ENDPOINT_SIZE,
1688 .bDescriptorType = USB_DT_ENDPOINT,
1689 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1690 };
1691
1692 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1693 .enable = dwc3_gadget_ep0_enable,
1694 .disable = dwc3_gadget_ep0_disable,
1695 .alloc_request = dwc3_gadget_ep_alloc_request,
1696 .free_request = dwc3_gadget_ep_free_request,
1697 .queue = dwc3_gadget_ep0_queue,
1698 .dequeue = dwc3_gadget_ep_dequeue,
1699 .set_halt = dwc3_gadget_ep0_set_halt,
1700 .set_wedge = dwc3_gadget_ep_set_wedge,
1701 };
1702
1703 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1704 .enable = dwc3_gadget_ep_enable,
1705 .disable = dwc3_gadget_ep_disable,
1706 .alloc_request = dwc3_gadget_ep_alloc_request,
1707 .free_request = dwc3_gadget_ep_free_request,
1708 .queue = dwc3_gadget_ep_queue,
1709 .dequeue = dwc3_gadget_ep_dequeue,
1710 .set_halt = dwc3_gadget_ep_set_halt,
1711 .set_wedge = dwc3_gadget_ep_set_wedge,
1712 };
1713
1714 /* -------------------------------------------------------------------------- */
1715
1716 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1717 {
1718 struct dwc3 *dwc = gadget_to_dwc(g);
1719
1720 return __dwc3_gadget_get_frame(dwc);
1721 }
1722
1723 static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
1724 {
1725 int retries;
1726
1727 int ret;
1728 u32 reg;
1729
1730 u8 link_state;
1731
1732 /*
1733 * According to the Databook Remote wakeup request should
1734 * be issued only when the device is in early suspend state.
1735 *
1736 * We can check that via USB Link State bits in DSTS register.
1737 */
1738 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1739
1740 link_state = DWC3_DSTS_USBLNKST(reg);
1741
1742 switch (link_state) {
1743 case DWC3_LINK_STATE_RESET:
1744 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1745 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1746 case DWC3_LINK_STATE_RESUME:
1747 break;
1748 default:
1749 return -EINVAL;
1750 }
1751
1752 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1753 if (ret < 0) {
1754 dev_err(dwc->dev, "failed to put link in Recovery\n");
1755 return ret;
1756 }
1757
1758 /* Recent versions do this automatically */
1759 if (dwc->revision < DWC3_REVISION_194A) {
1760 /* write zeroes to Link Change Request */
1761 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1762 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1763 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1764 }
1765
1766 /* poll until Link State changes to ON */
1767 retries = 20000;
1768
1769 while (retries--) {
1770 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1771
1772 /* in HS, means ON */
1773 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1774 break;
1775 }
1776
1777 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1778 dev_err(dwc->dev, "failed to send remote wakeup\n");
1779 return -EINVAL;
1780 }
1781
1782 return 0;
1783 }
1784
1785 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1786 {
1787 struct dwc3 *dwc = gadget_to_dwc(g);
1788 unsigned long flags;
1789 int ret;
1790
1791 spin_lock_irqsave(&dwc->lock, flags);
1792 ret = __dwc3_gadget_wakeup(dwc);
1793 spin_unlock_irqrestore(&dwc->lock, flags);
1794
1795 return ret;
1796 }
1797
1798 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1799 int is_selfpowered)
1800 {
1801 struct dwc3 *dwc = gadget_to_dwc(g);
1802 unsigned long flags;
1803
1804 spin_lock_irqsave(&dwc->lock, flags);
1805 g->is_selfpowered = !!is_selfpowered;
1806 spin_unlock_irqrestore(&dwc->lock, flags);
1807
1808 return 0;
1809 }
1810
1811 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1812 {
1813 u32 reg;
1814 u32 timeout = 500;
1815
1816 if (pm_runtime_suspended(dwc->dev))
1817 return 0;
1818
1819 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1820 if (is_on) {
1821 if (dwc->revision <= DWC3_REVISION_187A) {
1822 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1823 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1824 }
1825
1826 if (dwc->revision >= DWC3_REVISION_194A)
1827 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1828 reg |= DWC3_DCTL_RUN_STOP;
1829
1830 if (dwc->has_hibernation)
1831 reg |= DWC3_DCTL_KEEP_CONNECT;
1832
1833 dwc->pullups_connected = true;
1834 } else {
1835 reg &= ~DWC3_DCTL_RUN_STOP;
1836
1837 if (dwc->has_hibernation && !suspend)
1838 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1839
1840 dwc->pullups_connected = false;
1841 }
1842
1843 dwc3_gadget_dctl_write_safe(dwc, reg);
1844
1845 do {
1846 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1847 reg &= DWC3_DSTS_DEVCTRLHLT;
1848 } while (--timeout && !(!is_on ^ !reg));
1849
1850 if (!timeout)
1851 return -ETIMEDOUT;
1852
1853 return 0;
1854 }
1855
1856 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1857 {
1858 struct dwc3 *dwc = gadget_to_dwc(g);
1859 unsigned long flags;
1860 int ret;
1861
1862 is_on = !!is_on;
1863
1864 /*
1865 * Per databook, when we want to stop the gadget, if a control transfer
1866 * is still in process, complete it and get the core into setup phase.
1867 */
1868 if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
1869 reinit_completion(&dwc->ep0_in_setup);
1870
1871 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
1872 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
1873 if (ret == 0) {
1874 dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
1875 return -ETIMEDOUT;
1876 }
1877 }
1878
1879 spin_lock_irqsave(&dwc->lock, flags);
1880 ret = dwc3_gadget_run_stop(dwc, is_on, false);
1881 spin_unlock_irqrestore(&dwc->lock, flags);
1882
1883 return ret;
1884 }
1885
1886 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1887 {
1888 u32 reg;
1889
1890 /* Enable all but Start and End of Frame IRQs */
1891 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1892 DWC3_DEVTEN_EVNTOVERFLOWEN |
1893 DWC3_DEVTEN_CMDCMPLTEN |
1894 DWC3_DEVTEN_ERRTICERREN |
1895 DWC3_DEVTEN_WKUPEVTEN |
1896 DWC3_DEVTEN_CONNECTDONEEN |
1897 DWC3_DEVTEN_USBRSTEN |
1898 DWC3_DEVTEN_DISCONNEVTEN);
1899
1900 if (dwc->revision < DWC3_REVISION_250A)
1901 reg |= DWC3_DEVTEN_ULSTCNGEN;
1902
1903 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1904 }
1905
1906 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1907 {
1908 /* mask all interrupts */
1909 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1910 }
1911
1912 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1913 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1914
1915 /**
1916 * dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
1917 * @dwc: pointer to our context structure
1918 *
1919 * The following looks like complex but it's actually very simple. In order to
1920 * calculate the number of packets we can burst at once on OUT transfers, we're
1921 * gonna use RxFIFO size.
1922 *
1923 * To calculate RxFIFO size we need two numbers:
1924 * MDWIDTH = size, in bits, of the internal memory bus
1925 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
1926 *
1927 * Given these two numbers, the formula is simple:
1928 *
1929 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
1930 *
1931 * 24 bytes is for 3x SETUP packets
1932 * 16 bytes is a clock domain crossing tolerance
1933 *
1934 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
1935 */
1936 static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
1937 {
1938 u32 ram2_depth;
1939 u32 mdwidth;
1940 u32 nump;
1941 u32 reg;
1942
1943 ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
1944 mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
1945
1946 nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
1947 nump = min_t(u32, nump, 16);
1948
1949 /* update NumP */
1950 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1951 reg &= ~DWC3_DCFG_NUMP_MASK;
1952 reg |= nump << DWC3_DCFG_NUMP_SHIFT;
1953 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1954 }
1955
1956 static int __dwc3_gadget_start(struct dwc3 *dwc)
1957 {
1958 struct dwc3_ep *dep;
1959 int ret = 0;
1960 u32 reg;
1961
1962 /*
1963 * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
1964 * the core supports IMOD, disable it.
1965 */
1966 if (dwc->imod_interval) {
1967 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
1968 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
1969 } else if (dwc3_has_imod(dwc)) {
1970 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
1971 }
1972
1973 /*
1974 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
1975 * field instead of letting dwc3 itself calculate that automatically.
1976 *
1977 * This way, we maximize the chances that we'll be able to get several
1978 * bursts of data without going through any sort of endpoint throttling.
1979 */
1980 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1981 if (dwc3_is_usb31(dwc))
1982 reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;
1983 else
1984 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
1985
1986 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1987
1988 dwc3_gadget_setup_nump(dwc);
1989
1990 /* Start with SuperSpeed Default */
1991 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1992
1993 dep = dwc->eps[0];
1994 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
1995 if (ret) {
1996 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1997 goto err0;
1998 }
1999
2000 dep = dwc->eps[1];
2001 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
2002 if (ret) {
2003 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2004 goto err1;
2005 }
2006
2007 /* begin to receive SETUP packets */
2008 dwc->ep0state = EP0_SETUP_PHASE;
2009 dwc->link_state = DWC3_LINK_STATE_SS_DIS;
2010 dwc3_ep0_out_start(dwc);
2011
2012 dwc3_gadget_enable_irq(dwc);
2013
2014 return 0;
2015
2016 err1:
2017 __dwc3_gadget_ep_disable(dwc->eps[0]);
2018
2019 err0:
2020 return ret;
2021 }
2022
2023 static int dwc3_gadget_start(struct usb_gadget *g,
2024 struct usb_gadget_driver *driver)
2025 {
2026 struct dwc3 *dwc = gadget_to_dwc(g);
2027 unsigned long flags;
2028 int ret = 0;
2029 int irq;
2030
2031 irq = dwc->irq_gadget;
2032 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
2033 IRQF_SHARED, "dwc3", dwc->ev_buf);
2034 if (ret) {
2035 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2036 irq, ret);
2037 goto err0;
2038 }
2039
2040 spin_lock_irqsave(&dwc->lock, flags);
2041 if (dwc->gadget_driver) {
2042 dev_err(dwc->dev, "%s is already bound to %s\n",
2043 dwc->gadget.name,
2044 dwc->gadget_driver->driver.name);
2045 ret = -EBUSY;
2046 goto err1;
2047 }
2048
2049 dwc->gadget_driver = driver;
2050
2051 if (pm_runtime_active(dwc->dev))
2052 __dwc3_gadget_start(dwc);
2053
2054 spin_unlock_irqrestore(&dwc->lock, flags);
2055
2056 return 0;
2057
2058 err1:
2059 spin_unlock_irqrestore(&dwc->lock, flags);
2060 free_irq(irq, dwc);
2061
2062 err0:
2063 return ret;
2064 }
2065
2066 static void __dwc3_gadget_stop(struct dwc3 *dwc)
2067 {
2068 dwc3_gadget_disable_irq(dwc);
2069 __dwc3_gadget_ep_disable(dwc->eps[0]);
2070 __dwc3_gadget_ep_disable(dwc->eps[1]);
2071 }
2072
2073 static int dwc3_gadget_stop(struct usb_gadget *g)
2074 {
2075 struct dwc3 *dwc = gadget_to_dwc(g);
2076 unsigned long flags;
2077
2078 spin_lock_irqsave(&dwc->lock, flags);
2079
2080 if (pm_runtime_suspended(dwc->dev))
2081 goto out;
2082
2083 __dwc3_gadget_stop(dwc);
2084
2085 out:
2086 dwc->gadget_driver = NULL;
2087 spin_unlock_irqrestore(&dwc->lock, flags);
2088
2089 free_irq(dwc->irq_gadget, dwc->ev_buf);
2090
2091 return 0;
2092 }
2093
2094 static void dwc3_gadget_config_params(struct usb_gadget *g,
2095 struct usb_dcd_config_params *params)
2096 {
2097 struct dwc3 *dwc = gadget_to_dwc(g);
2098
2099 params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
2100 params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;
2101
2102 /* Recommended BESL */
2103 if (!dwc->dis_enblslpm_quirk) {
2104 /*
2105 * If the recommended BESL baseline is 0 or if the BESL deep is
2106 * less than 2, Microsoft's Windows 10 host usb stack will issue
2107 * a usb reset immediately after it receives the extended BOS
2108 * descriptor and the enumeration will fail. To maintain
2109 * compatibility with the Windows' usb stack, let's set the
2110 * recommended BESL baseline to 1 and clamp the BESL deep to be
2111 * within 2 to 15.
2112 */
2113 params->besl_baseline = 1;
2114 if (dwc->is_utmi_l1_suspend)
2115 params->besl_deep =
2116 clamp_t(u8, dwc->hird_threshold, 2, 15);
2117 }
2118
2119 /* U1 Device exit Latency */
2120 if (dwc->dis_u1_entry_quirk)
2121 params->bU1devExitLat = 0;
2122 else
2123 params->bU1devExitLat = DWC3_DEFAULT_U1_DEV_EXIT_LAT;
2124
2125 /* U2 Device exit Latency */
2126 if (dwc->dis_u2_entry_quirk)
2127 params->bU2DevExitLat = 0;
2128 else
2129 params->bU2DevExitLat =
2130 cpu_to_le16(DWC3_DEFAULT_U2_DEV_EXIT_LAT);
2131 }
2132
2133 static void dwc3_gadget_set_speed(struct usb_gadget *g,
2134 enum usb_device_speed speed)
2135 {
2136 struct dwc3 *dwc = gadget_to_dwc(g);
2137 unsigned long flags;
2138 u32 reg;
2139
2140 spin_lock_irqsave(&dwc->lock, flags);
2141 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2142 reg &= ~(DWC3_DCFG_SPEED_MASK);
2143
2144 /*
2145 * WORKAROUND: DWC3 revision < 2.20a have an issue
2146 * which would cause metastability state on Run/Stop
2147 * bit if we try to force the IP to USB2-only mode.
2148 *
2149 * Because of that, we cannot configure the IP to any
2150 * speed other than the SuperSpeed
2151 *
2152 * Refers to:
2153 *
2154 * STAR#9000525659: Clock Domain Crossing on DCTL in
2155 * USB 2.0 Mode
2156 */
2157 if (dwc->revision < DWC3_REVISION_220A &&
2158 !dwc->dis_metastability_quirk) {
2159 reg |= DWC3_DCFG_SUPERSPEED;
2160 } else {
2161 switch (speed) {
2162 case USB_SPEED_LOW:
2163 reg |= DWC3_DCFG_LOWSPEED;
2164 break;
2165 case USB_SPEED_FULL:
2166 reg |= DWC3_DCFG_FULLSPEED;
2167 break;
2168 case USB_SPEED_HIGH:
2169 reg |= DWC3_DCFG_HIGHSPEED;
2170 break;
2171 case USB_SPEED_SUPER:
2172 reg |= DWC3_DCFG_SUPERSPEED;
2173 break;
2174 case USB_SPEED_SUPER_PLUS:
2175 if (dwc3_is_usb31(dwc))
2176 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2177 else
2178 reg |= DWC3_DCFG_SUPERSPEED;
2179 break;
2180 default:
2181 dev_err(dwc->dev, "invalid speed (%d)\n", speed);
2182
2183 if (dwc->revision & DWC3_REVISION_IS_DWC31)
2184 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2185 else
2186 reg |= DWC3_DCFG_SUPERSPEED;
2187 }
2188 }
2189 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2190
2191 spin_unlock_irqrestore(&dwc->lock, flags);
2192 }
2193
2194 static const struct usb_gadget_ops dwc3_gadget_ops = {
2195 .get_frame = dwc3_gadget_get_frame,
2196 .wakeup = dwc3_gadget_wakeup,
2197 .set_selfpowered = dwc3_gadget_set_selfpowered,
2198 .pullup = dwc3_gadget_pullup,
2199 .udc_start = dwc3_gadget_start,
2200 .udc_stop = dwc3_gadget_stop,
2201 .udc_set_speed = dwc3_gadget_set_speed,
2202 .get_config_params = dwc3_gadget_config_params,
2203 };
2204
2205 /* -------------------------------------------------------------------------- */
2206
2207 static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
2208 {
2209 struct dwc3 *dwc = dep->dwc;
2210
2211 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
2212 dep->endpoint.maxburst = 1;
2213 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
2214 if (!dep->direction)
2215 dwc->gadget.ep0 = &dep->endpoint;
2216
2217 dep->endpoint.caps.type_control = true;
2218
2219 return 0;
2220 }
2221
2222 static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
2223 {
2224 struct dwc3 *dwc = dep->dwc;
2225 int mdwidth;
2226 int size;
2227
2228 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
2229 /* MDWIDTH is represented in bits, we need it in bytes */
2230 mdwidth /= 8;
2231
2232 size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
2233 if (dwc3_is_usb31(dwc))
2234 size = DWC31_GTXFIFOSIZ_TXFDEP(size);
2235 else
2236 size = DWC3_GTXFIFOSIZ_TXFDEP(size);
2237
2238 /* FIFO Depth is in MDWDITH bytes. Multiply */
2239 size *= mdwidth;
2240
2241 /*
2242 * To meet performance requirement, a minimum TxFIFO size of 3x
2243 * MaxPacketSize is recommended for endpoints that support burst and a
2244 * minimum TxFIFO size of 2x MaxPacketSize for endpoints that don't
2245 * support burst. Use those numbers and we can calculate the max packet
2246 * limit as below.
2247 */
2248 if (dwc->maximum_speed >= USB_SPEED_SUPER)
2249 size /= 3;
2250 else
2251 size /= 2;
2252
2253 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
2254
2255 dep->endpoint.max_streams = 15;
2256 dep->endpoint.ops = &dwc3_gadget_ep_ops;
2257 list_add_tail(&dep->endpoint.ep_list,
2258 &dwc->gadget.ep_list);
2259 dep->endpoint.caps.type_iso = true;
2260 dep->endpoint.caps.type_bulk = true;
2261 dep->endpoint.caps.type_int = true;
2262
2263 return dwc3_alloc_trb_pool(dep);
2264 }
2265
2266 static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
2267 {
2268 struct dwc3 *dwc = dep->dwc;
2269 int mdwidth;
2270 int size;
2271
2272 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
2273
2274 /* MDWIDTH is represented in bits, convert to bytes */
2275 mdwidth /= 8;
2276
2277 /* All OUT endpoints share a single RxFIFO space */
2278 size = dwc3_readl(dwc->regs, DWC3_GRXFIFOSIZ(0));
2279 if (dwc3_is_usb31(dwc))
2280 size = DWC31_GRXFIFOSIZ_RXFDEP(size);
2281 else
2282 size = DWC3_GRXFIFOSIZ_RXFDEP(size);
2283
2284 /* FIFO depth is in MDWDITH bytes */
2285 size *= mdwidth;
2286
2287 /*
2288 * To meet performance requirement, a minimum recommended RxFIFO size
2289 * is defined as follow:
2290 * RxFIFO size >= (3 x MaxPacketSize) +
2291 * (3 x 8 bytes setup packets size) + (16 bytes clock crossing margin)
2292 *
2293 * Then calculate the max packet limit as below.
2294 */
2295 size -= (3 * 8) + 16;
2296 if (size < 0)
2297 size = 0;
2298 else
2299 size /= 3;
2300
2301 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
2302 dep->endpoint.max_streams = 15;
2303 dep->endpoint.ops = &dwc3_gadget_ep_ops;
2304 list_add_tail(&dep->endpoint.ep_list,
2305 &dwc->gadget.ep_list);
2306 dep->endpoint.caps.type_iso = true;
2307 dep->endpoint.caps.type_bulk = true;
2308 dep->endpoint.caps.type_int = true;
2309
2310 return dwc3_alloc_trb_pool(dep);
2311 }
2312
2313 static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
2314 {
2315 struct dwc3_ep *dep;
2316 bool direction = epnum & 1;
2317 int ret;
2318 u8 num = epnum >> 1;
2319
2320 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2321 if (!dep)
2322 return -ENOMEM;
2323
2324 dep->dwc = dwc;
2325 dep->number = epnum;
2326 dep->direction = direction;
2327 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
2328 dwc->eps[epnum] = dep;
2329 dep->combo_num = 0;
2330 dep->start_cmd_status = 0;
2331
2332 snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
2333 direction ? "in" : "out");
2334
2335 dep->endpoint.name = dep->name;
2336
2337 if (!(dep->number > 1)) {
2338 dep->endpoint.desc = &dwc3_gadget_ep0_desc;
2339 dep->endpoint.comp_desc = NULL;
2340 }
2341
2342 if (num == 0)
2343 ret = dwc3_gadget_init_control_endpoint(dep);
2344 else if (direction)
2345 ret = dwc3_gadget_init_in_endpoint(dep);
2346 else
2347 ret = dwc3_gadget_init_out_endpoint(dep);
2348
2349 if (ret)
2350 return ret;
2351
2352 dep->endpoint.caps.dir_in = direction;
2353 dep->endpoint.caps.dir_out = !direction;
2354
2355 INIT_LIST_HEAD(&dep->pending_list);
2356 INIT_LIST_HEAD(&dep->started_list);
2357 INIT_LIST_HEAD(&dep->cancelled_list);
2358
2359 return 0;
2360 }
2361
2362 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
2363 {
2364 u8 epnum;
2365
2366 INIT_LIST_HEAD(&dwc->gadget.ep_list);
2367
2368 for (epnum = 0; epnum < total; epnum++) {
2369 int ret;
2370
2371 ret = dwc3_gadget_init_endpoint(dwc, epnum);
2372 if (ret)
2373 return ret;
2374 }
2375
2376 return 0;
2377 }
2378
2379 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
2380 {
2381 struct dwc3_ep *dep;
2382 u8 epnum;
2383
2384 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2385 dep = dwc->eps[epnum];
2386 if (!dep)
2387 continue;
2388 /*
2389 * Physical endpoints 0 and 1 are special; they form the
2390 * bi-directional USB endpoint 0.
2391 *
2392 * For those two physical endpoints, we don't allocate a TRB
2393 * pool nor do we add them the endpoints list. Due to that, we
2394 * shouldn't do these two operations otherwise we would end up
2395 * with all sorts of bugs when removing dwc3.ko.
2396 */
2397 if (epnum != 0 && epnum != 1) {
2398 dwc3_free_trb_pool(dep);
2399 list_del(&dep->endpoint.ep_list);
2400 }
2401
2402 kfree(dep);
2403 }
2404 }
2405
2406 /* -------------------------------------------------------------------------- */
2407
2408 static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
2409 struct dwc3_request *req, struct dwc3_trb *trb,
2410 const struct dwc3_event_depevt *event, int status, int chain)
2411 {
2412 unsigned int count;
2413
2414 dwc3_ep_inc_deq(dep);
2415
2416 trace_dwc3_complete_trb(dep, trb);
2417 req->num_trbs--;
2418
2419 /*
2420 * If we're in the middle of series of chained TRBs and we
2421 * receive a short transfer along the way, DWC3 will skip
2422 * through all TRBs including the last TRB in the chain (the
2423 * where CHN bit is zero. DWC3 will also avoid clearing HWO
2424 * bit and SW has to do it manually.
2425 *
2426 * We're going to do that here to avoid problems of HW trying
2427 * to use bogus TRBs for transfers.
2428 */
2429 if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
2430 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2431
2432 /*
2433 * For isochronous transfers, the first TRB in a service interval must
2434 * have the Isoc-First type. Track and report its interval frame number.
2435 */
2436 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
2437 (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) {
2438 unsigned int frame_number;
2439
2440 frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl);
2441 frame_number &= ~(dep->interval - 1);
2442 req->request.frame_number = frame_number;
2443 }
2444
2445 /*
2446 * If we're dealing with unaligned size OUT transfer, we will be left
2447 * with one TRB pending in the ring. We need to manually clear HWO bit
2448 * from that TRB.
2449 */
2450
2451 if (req->needs_extra_trb && !(trb->ctrl & DWC3_TRB_CTRL_CHN)) {
2452 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2453 return 1;
2454 }
2455
2456 count = trb->size & DWC3_TRB_SIZE_MASK;
2457 req->remaining += count;
2458
2459 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
2460 return 1;
2461
2462 if (event->status & DEPEVT_STATUS_SHORT && !chain)
2463 return 1;
2464
2465 if ((trb->ctrl & DWC3_TRB_CTRL_IOC) ||
2466 (trb->ctrl & DWC3_TRB_CTRL_LST))
2467 return 1;
2468
2469 return 0;
2470 }
2471
2472 static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
2473 struct dwc3_request *req, const struct dwc3_event_depevt *event,
2474 int status)
2475 {
2476 struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
2477 struct scatterlist *sg = req->sg;
2478 struct scatterlist *s;
2479 unsigned int pending = req->num_pending_sgs;
2480 unsigned int i;
2481 int ret = 0;
2482
2483 for_each_sg(sg, s, pending, i) {
2484 trb = &dep->trb_pool[dep->trb_dequeue];
2485
2486 if (trb->ctrl & DWC3_TRB_CTRL_HWO)
2487 break;
2488
2489 req->sg = sg_next(s);
2490 req->num_pending_sgs--;
2491
2492 ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
2493 trb, event, status, true);
2494 if (ret)
2495 break;
2496 }
2497
2498 return ret;
2499 }
2500
2501 static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
2502 struct dwc3_request *req, const struct dwc3_event_depevt *event,
2503 int status)
2504 {
2505 struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
2506
2507 return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
2508 event, status, false);
2509 }
2510
2511 static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
2512 {
2513 return req->num_pending_sgs == 0;
2514 }
2515
2516 static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
2517 const struct dwc3_event_depevt *event,
2518 struct dwc3_request *req, int status)
2519 {
2520 int ret;
2521
2522 if (req->num_pending_sgs)
2523 ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
2524 status);
2525 else
2526 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
2527 status);
2528
2529 if (req->needs_extra_trb) {
2530 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
2531 status);
2532 req->needs_extra_trb = false;
2533 }
2534
2535 req->request.actual = req->request.length - req->remaining;
2536
2537 if (!dwc3_gadget_ep_request_completed(req)) {
2538 __dwc3_gadget_kick_transfer(dep);
2539 goto out;
2540 }
2541
2542 dwc3_gadget_giveback(dep, req, status);
2543
2544 out:
2545 return ret;
2546 }
2547
2548 static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
2549 const struct dwc3_event_depevt *event, int status)
2550 {
2551 struct dwc3_request *req;
2552 struct dwc3_request *tmp;
2553
2554 list_for_each_entry_safe(req, tmp, &dep->started_list, list) {
2555 int ret;
2556
2557 ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
2558 req, status);
2559 if (ret)
2560 break;
2561 }
2562 }
2563
2564 static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
2565 const struct dwc3_event_depevt *event)
2566 {
2567 dep->frame_number = event->parameters;
2568 }
2569
2570 static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
2571 const struct dwc3_event_depevt *event)
2572 {
2573 struct dwc3 *dwc = dep->dwc;
2574 unsigned status = 0;
2575 bool stop = false;
2576
2577 dwc3_gadget_endpoint_frame_from_event(dep, event);
2578
2579 if (event->status & DEPEVT_STATUS_BUSERR)
2580 status = -ECONNRESET;
2581
2582 if (event->status & DEPEVT_STATUS_MISSED_ISOC) {
2583 status = -EXDEV;
2584
2585 if (list_empty(&dep->started_list))
2586 stop = true;
2587 }
2588
2589 dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
2590
2591 if (stop)
2592 dwc3_stop_active_transfer(dep, true, true);
2593
2594 /*
2595 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2596 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2597 */
2598 if (dwc->revision < DWC3_REVISION_183A) {
2599 u32 reg;
2600 int i;
2601
2602 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
2603 dep = dwc->eps[i];
2604
2605 if (!(dep->flags & DWC3_EP_ENABLED))
2606 continue;
2607
2608 if (!list_empty(&dep->started_list))
2609 return;
2610 }
2611
2612 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2613 reg |= dwc->u1u2;
2614 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2615
2616 dwc->u1u2 = 0;
2617 }
2618 }
2619
2620 static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
2621 const struct dwc3_event_depevt *event)
2622 {
2623 dwc3_gadget_endpoint_frame_from_event(dep, event);
2624 (void) __dwc3_gadget_start_isoc(dep);
2625 }
2626
2627 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2628 const struct dwc3_event_depevt *event)
2629 {
2630 struct dwc3_ep *dep;
2631 u8 epnum = event->endpoint_number;
2632 u8 cmd;
2633
2634 dep = dwc->eps[epnum];
2635
2636 if (!(dep->flags & DWC3_EP_ENABLED)) {
2637 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED))
2638 return;
2639
2640 /* Handle only EPCMDCMPLT when EP disabled */
2641 if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
2642 return;
2643 }
2644
2645 if (epnum == 0 || epnum == 1) {
2646 dwc3_ep0_interrupt(dwc, event);
2647 return;
2648 }
2649
2650 switch (event->endpoint_event) {
2651 case DWC3_DEPEVT_XFERINPROGRESS:
2652 dwc3_gadget_endpoint_transfer_in_progress(dep, event);
2653 break;
2654 case DWC3_DEPEVT_XFERNOTREADY:
2655 dwc3_gadget_endpoint_transfer_not_ready(dep, event);
2656 break;
2657 case DWC3_DEPEVT_EPCMDCMPLT:
2658 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
2659
2660 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
2661 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
2662 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
2663 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
2664 if ((dep->flags & DWC3_EP_DELAY_START) &&
2665 !usb_endpoint_xfer_isoc(dep->endpoint.desc))
2666 __dwc3_gadget_kick_transfer(dep);
2667
2668 dep->flags &= ~DWC3_EP_DELAY_START;
2669 }
2670 break;
2671 case DWC3_DEPEVT_STREAMEVT:
2672 case DWC3_DEPEVT_XFERCOMPLETE:
2673 case DWC3_DEPEVT_RXTXFIFOEVT:
2674 break;
2675 }
2676 }
2677
2678 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2679 {
2680 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2681 spin_unlock(&dwc->lock);
2682 dwc->gadget_driver->disconnect(&dwc->gadget);
2683 spin_lock(&dwc->lock);
2684 }
2685 }
2686
2687 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2688 {
2689 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2690 spin_unlock(&dwc->lock);
2691 dwc->gadget_driver->suspend(&dwc->gadget);
2692 spin_lock(&dwc->lock);
2693 }
2694 }
2695
2696 static void dwc3_resume_gadget(struct dwc3 *dwc)
2697 {
2698 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2699 spin_unlock(&dwc->lock);
2700 dwc->gadget_driver->resume(&dwc->gadget);
2701 spin_lock(&dwc->lock);
2702 }
2703 }
2704
2705 static void dwc3_reset_gadget(struct dwc3 *dwc)
2706 {
2707 if (!dwc->gadget_driver)
2708 return;
2709
2710 if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2711 spin_unlock(&dwc->lock);
2712 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2713 spin_lock(&dwc->lock);
2714 }
2715 }
2716
2717 static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
2718 bool interrupt)
2719 {
2720 struct dwc3_gadget_ep_cmd_params params;
2721 u32 cmd;
2722 int ret;
2723
2724 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
2725 (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
2726 return;
2727
2728 /*
2729 * NOTICE: We are violating what the Databook says about the
2730 * EndTransfer command. Ideally we would _always_ wait for the
2731 * EndTransfer Command Completion IRQ, but that's causing too
2732 * much trouble synchronizing between us and gadget driver.
2733 *
2734 * We have discussed this with the IP Provider and it was
2735 * suggested to giveback all requests here.
2736 *
2737 * Note also that a similar handling was tested by Synopsys
2738 * (thanks a lot Paul) and nothing bad has come out of it.
2739 * In short, what we're doing is issuing EndTransfer with
2740 * CMDIOC bit set and delay kicking transfer until the
2741 * EndTransfer command had completed.
2742 *
2743 * As of IP version 3.10a of the DWC_usb3 IP, the controller
2744 * supports a mode to work around the above limitation. The
2745 * software can poll the CMDACT bit in the DEPCMD register
2746 * after issuing a EndTransfer command. This mode is enabled
2747 * by writing GUCTL2[14]. This polling is already done in the
2748 * dwc3_send_gadget_ep_cmd() function so if the mode is
2749 * enabled, the EndTransfer command will have completed upon
2750 * returning from this function.
2751 *
2752 * This mode is NOT available on the DWC_usb31 IP.
2753 */
2754
2755 cmd = DWC3_DEPCMD_ENDTRANSFER;
2756 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2757 cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0;
2758 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2759 memset(&params, 0, sizeof(params));
2760 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
2761 WARN_ON_ONCE(ret);
2762 dep->resource_index = 0;
2763
2764 if (!interrupt)
2765 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
2766 else
2767 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
2768 }
2769
2770 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2771 {
2772 u32 epnum;
2773
2774 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2775 struct dwc3_ep *dep;
2776 int ret;
2777
2778 dep = dwc->eps[epnum];
2779 if (!dep)
2780 continue;
2781
2782 if (!(dep->flags & DWC3_EP_STALL))
2783 continue;
2784
2785 dep->flags &= ~DWC3_EP_STALL;
2786
2787 ret = dwc3_send_clear_stall_ep_cmd(dep);
2788 WARN_ON_ONCE(ret);
2789 }
2790 }
2791
2792 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2793 {
2794 int reg;
2795
2796 dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
2797
2798 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2799 reg &= ~DWC3_DCTL_INITU1ENA;
2800 reg &= ~DWC3_DCTL_INITU2ENA;
2801 dwc3_gadget_dctl_write_safe(dwc, reg);
2802
2803 dwc3_disconnect_gadget(dwc);
2804
2805 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2806 dwc->setup_packet_pending = false;
2807 usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2808
2809 dwc->connected = false;
2810 }
2811
2812 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2813 {
2814 u32 reg;
2815
2816 dwc->connected = true;
2817
2818 /*
2819 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2820 * would cause a missing Disconnect Event if there's a
2821 * pending Setup Packet in the FIFO.
2822 *
2823 * There's no suggested workaround on the official Bug
2824 * report, which states that "unless the driver/application
2825 * is doing any special handling of a disconnect event,
2826 * there is no functional issue".
2827 *
2828 * Unfortunately, it turns out that we _do_ some special
2829 * handling of a disconnect event, namely complete all
2830 * pending transfers, notify gadget driver of the
2831 * disconnection, and so on.
2832 *
2833 * Our suggested workaround is to follow the Disconnect
2834 * Event steps here, instead, based on a setup_packet_pending
2835 * flag. Such flag gets set whenever we have a SETUP_PENDING
2836 * status for EP0 TRBs and gets cleared on XferComplete for the
2837 * same endpoint.
2838 *
2839 * Refers to:
2840 *
2841 * STAR#9000466709: RTL: Device : Disconnect event not
2842 * generated if setup packet pending in FIFO
2843 */
2844 if (dwc->revision < DWC3_REVISION_188A) {
2845 if (dwc->setup_packet_pending)
2846 dwc3_gadget_disconnect_interrupt(dwc);
2847 }
2848
2849 dwc3_reset_gadget(dwc);
2850
2851 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2852 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2853 dwc3_gadget_dctl_write_safe(dwc, reg);
2854 dwc->test_mode = false;
2855 dwc3_clear_stall_all_ep(dwc);
2856
2857 /* Reset device address to zero */
2858 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2859 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2860 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2861 }
2862
2863 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2864 {
2865 struct dwc3_ep *dep;
2866 int ret;
2867 u32 reg;
2868 u8 speed;
2869
2870 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2871 speed = reg & DWC3_DSTS_CONNECTSPD;
2872 dwc->speed = speed;
2873
2874 /*
2875 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2876 * each time on Connect Done.
2877 *
2878 * Currently we always use the reset value. If any platform
2879 * wants to set this to a different value, we need to add a
2880 * setting and update GCTL.RAMCLKSEL here.
2881 */
2882
2883 switch (speed) {
2884 case DWC3_DSTS_SUPERSPEED_PLUS:
2885 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2886 dwc->gadget.ep0->maxpacket = 512;
2887 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2888 break;
2889 case DWC3_DSTS_SUPERSPEED:
2890 /*
2891 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2892 * would cause a missing USB3 Reset event.
2893 *
2894 * In such situations, we should force a USB3 Reset
2895 * event by calling our dwc3_gadget_reset_interrupt()
2896 * routine.
2897 *
2898 * Refers to:
2899 *
2900 * STAR#9000483510: RTL: SS : USB3 reset event may
2901 * not be generated always when the link enters poll
2902 */
2903 if (dwc->revision < DWC3_REVISION_190A)
2904 dwc3_gadget_reset_interrupt(dwc);
2905
2906 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2907 dwc->gadget.ep0->maxpacket = 512;
2908 dwc->gadget.speed = USB_SPEED_SUPER;
2909 break;
2910 case DWC3_DSTS_HIGHSPEED:
2911 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2912 dwc->gadget.ep0->maxpacket = 64;
2913 dwc->gadget.speed = USB_SPEED_HIGH;
2914 break;
2915 case DWC3_DSTS_FULLSPEED:
2916 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2917 dwc->gadget.ep0->maxpacket = 64;
2918 dwc->gadget.speed = USB_SPEED_FULL;
2919 break;
2920 case DWC3_DSTS_LOWSPEED:
2921 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2922 dwc->gadget.ep0->maxpacket = 8;
2923 dwc->gadget.speed = USB_SPEED_LOW;
2924 break;
2925 }
2926
2927 dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
2928
2929 /* Enable USB2 LPM Capability */
2930
2931 if ((dwc->revision > DWC3_REVISION_194A) &&
2932 (speed != DWC3_DSTS_SUPERSPEED) &&
2933 (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
2934 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2935 reg |= DWC3_DCFG_LPM_CAP;
2936 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2937
2938 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2939 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2940
2941 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
2942 (dwc->is_utmi_l1_suspend << 4));
2943
2944 /*
2945 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2946 * DCFG.LPMCap is set, core responses with an ACK and the
2947 * BESL value in the LPM token is less than or equal to LPM
2948 * NYET threshold.
2949 */
2950 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2951 && dwc->has_lpm_erratum,
2952 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
2953
2954 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2955 reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);
2956
2957 dwc3_gadget_dctl_write_safe(dwc, reg);
2958 } else {
2959 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2960 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2961 dwc3_gadget_dctl_write_safe(dwc, reg);
2962 }
2963
2964 dep = dwc->eps[0];
2965 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
2966 if (ret) {
2967 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2968 return;
2969 }
2970
2971 dep = dwc->eps[1];
2972 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
2973 if (ret) {
2974 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2975 return;
2976 }
2977
2978 /*
2979 * Configure PHY via GUSB3PIPECTLn if required.
2980 *
2981 * Update GTXFIFOSIZn
2982 *
2983 * In both cases reset values should be sufficient.
2984 */
2985 }
2986
2987 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2988 {
2989 /*
2990 * TODO take core out of low power mode when that's
2991 * implemented.
2992 */
2993
2994 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2995 spin_unlock(&dwc->lock);
2996 dwc->gadget_driver->resume(&dwc->gadget);
2997 spin_lock(&dwc->lock);
2998 }
2999 }
3000
3001 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
3002 unsigned int evtinfo)
3003 {
3004 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
3005 unsigned int pwropt;
3006
3007 /*
3008 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
3009 * Hibernation mode enabled which would show up when device detects
3010 * host-initiated U3 exit.
3011 *
3012 * In that case, device will generate a Link State Change Interrupt
3013 * from U3 to RESUME which is only necessary if Hibernation is
3014 * configured in.
3015 *
3016 * There are no functional changes due to such spurious event and we
3017 * just need to ignore it.
3018 *
3019 * Refers to:
3020 *
3021 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
3022 * operational mode
3023 */
3024 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
3025 if ((dwc->revision < DWC3_REVISION_250A) &&
3026 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
3027 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
3028 (next == DWC3_LINK_STATE_RESUME)) {
3029 return;
3030 }
3031 }
3032
3033 /*
3034 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
3035 * on the link partner, the USB session might do multiple entry/exit
3036 * of low power states before a transfer takes place.
3037 *
3038 * Due to this problem, we might experience lower throughput. The
3039 * suggested workaround is to disable DCTL[12:9] bits if we're
3040 * transitioning from U1/U2 to U0 and enable those bits again
3041 * after a transfer completes and there are no pending transfers
3042 * on any of the enabled endpoints.
3043 *
3044 * This is the first half of that workaround.
3045 *
3046 * Refers to:
3047 *
3048 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
3049 * core send LGO_Ux entering U0
3050 */
3051 if (dwc->revision < DWC3_REVISION_183A) {
3052 if (next == DWC3_LINK_STATE_U0) {
3053 u32 u1u2;
3054 u32 reg;
3055
3056 switch (dwc->link_state) {
3057 case DWC3_LINK_STATE_U1:
3058 case DWC3_LINK_STATE_U2:
3059 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3060 u1u2 = reg & (DWC3_DCTL_INITU2ENA
3061 | DWC3_DCTL_ACCEPTU2ENA
3062 | DWC3_DCTL_INITU1ENA
3063 | DWC3_DCTL_ACCEPTU1ENA);
3064
3065 if (!dwc->u1u2)
3066 dwc->u1u2 = reg & u1u2;
3067
3068 reg &= ~u1u2;
3069
3070 dwc3_gadget_dctl_write_safe(dwc, reg);
3071 break;
3072 default:
3073 /* do nothing */
3074 break;
3075 }
3076 }
3077 }
3078
3079 switch (next) {
3080 case DWC3_LINK_STATE_U1:
3081 if (dwc->speed == USB_SPEED_SUPER)
3082 dwc3_suspend_gadget(dwc);
3083 break;
3084 case DWC3_LINK_STATE_U2:
3085 case DWC3_LINK_STATE_U3:
3086 dwc3_suspend_gadget(dwc);
3087 break;
3088 case DWC3_LINK_STATE_RESUME:
3089 dwc3_resume_gadget(dwc);
3090 break;
3091 default:
3092 /* do nothing */
3093 break;
3094 }
3095
3096 dwc->link_state = next;
3097 }
3098
3099 static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
3100 unsigned int evtinfo)
3101 {
3102 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
3103
3104 if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
3105 dwc3_suspend_gadget(dwc);
3106
3107 dwc->link_state = next;
3108 }
3109
3110 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
3111 unsigned int evtinfo)
3112 {
3113 unsigned int is_ss = evtinfo & BIT(4);
3114
3115 /*
3116 * WORKAROUND: DWC3 revison 2.20a with hibernation support
3117 * have a known issue which can cause USB CV TD.9.23 to fail
3118 * randomly.
3119 *
3120 * Because of this issue, core could generate bogus hibernation
3121 * events which SW needs to ignore.
3122 *
3123 * Refers to:
3124 *
3125 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
3126 * Device Fallback from SuperSpeed
3127 */
3128 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
3129 return;
3130
3131 /* enter hibernation here */
3132 }
3133
3134 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
3135 const struct dwc3_event_devt *event)
3136 {
3137 switch (event->type) {
3138 case DWC3_DEVICE_EVENT_DISCONNECT:
3139 dwc3_gadget_disconnect_interrupt(dwc);
3140 break;
3141 case DWC3_DEVICE_EVENT_RESET:
3142 dwc3_gadget_reset_interrupt(dwc);
3143 break;
3144 case DWC3_DEVICE_EVENT_CONNECT_DONE:
3145 dwc3_gadget_conndone_interrupt(dwc);
3146 break;
3147 case DWC3_DEVICE_EVENT_WAKEUP:
3148 dwc3_gadget_wakeup_interrupt(dwc);
3149 break;
3150 case DWC3_DEVICE_EVENT_HIBER_REQ:
3151 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
3152 "unexpected hibernation event\n"))
3153 break;
3154
3155 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
3156 break;
3157 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
3158 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
3159 break;
3160 case DWC3_DEVICE_EVENT_EOPF:
3161 /* It changed to be suspend event for version 2.30a and above */
3162 if (dwc->revision >= DWC3_REVISION_230A) {
3163 /*
3164 * Ignore suspend event until the gadget enters into
3165 * USB_STATE_CONFIGURED state.
3166 */
3167 if (dwc->gadget.state >= USB_STATE_CONFIGURED)
3168 dwc3_gadget_suspend_interrupt(dwc,
3169 event->event_info);
3170 }
3171 break;
3172 case DWC3_DEVICE_EVENT_SOF:
3173 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
3174 case DWC3_DEVICE_EVENT_CMD_CMPL:
3175 case DWC3_DEVICE_EVENT_OVERFLOW:
3176 break;
3177 default:
3178 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
3179 }
3180 }
3181
3182 static void dwc3_process_event_entry(struct dwc3 *dwc,
3183 const union dwc3_event *event)
3184 {
3185 trace_dwc3_event(event->raw, dwc);
3186
3187 if (!event->type.is_devspec)
3188 dwc3_endpoint_interrupt(dwc, &event->depevt);
3189 else if (event->type.type == DWC3_EVENT_TYPE_DEV)
3190 dwc3_gadget_interrupt(dwc, &event->devt);
3191 else
3192 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
3193 }
3194
3195 static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
3196 {
3197 struct dwc3 *dwc = evt->dwc;
3198 irqreturn_t ret = IRQ_NONE;
3199 int left;
3200 u32 reg;
3201
3202 left = evt->count;
3203
3204 if (!(evt->flags & DWC3_EVENT_PENDING))
3205 return IRQ_NONE;
3206
3207 while (left > 0) {
3208 union dwc3_event event;
3209
3210 event.raw = *(u32 *) (evt->cache + evt->lpos);
3211
3212 dwc3_process_event_entry(dwc, &event);
3213
3214 /*
3215 * FIXME we wrap around correctly to the next entry as
3216 * almost all entries are 4 bytes in size. There is one
3217 * entry which has 12 bytes which is a regular entry
3218 * followed by 8 bytes data. ATM I don't know how
3219 * things are organized if we get next to the a
3220 * boundary so I worry about that once we try to handle
3221 * that.
3222 */
3223 evt->lpos = (evt->lpos + 4) % evt->length;
3224 left -= 4;
3225 }
3226
3227 evt->count = 0;
3228 evt->flags &= ~DWC3_EVENT_PENDING;
3229 ret = IRQ_HANDLED;
3230
3231 /* Unmask interrupt */
3232 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
3233 reg &= ~DWC3_GEVNTSIZ_INTMASK;
3234 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
3235
3236 if (dwc->imod_interval) {
3237 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
3238 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
3239 }
3240
3241 return ret;
3242 }
3243
3244 static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
3245 {
3246 struct dwc3_event_buffer *evt = _evt;
3247 struct dwc3 *dwc = evt->dwc;
3248 unsigned long flags;
3249 irqreturn_t ret = IRQ_NONE;
3250
3251 spin_lock_irqsave(&dwc->lock, flags);
3252 ret = dwc3_process_event_buf(evt);
3253 spin_unlock_irqrestore(&dwc->lock, flags);
3254
3255 return ret;
3256 }
3257
3258 static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
3259 {
3260 struct dwc3 *dwc = evt->dwc;
3261 u32 amount;
3262 u32 count;
3263 u32 reg;
3264
3265 if (pm_runtime_suspended(dwc->dev)) {
3266 pm_runtime_get(dwc->dev);
3267 disable_irq_nosync(dwc->irq_gadget);
3268 dwc->pending_events = true;
3269 return IRQ_HANDLED;
3270 }
3271
3272 /*
3273 * With PCIe legacy interrupt, test shows that top-half irq handler can
3274 * be called again after HW interrupt deassertion. Check if bottom-half
3275 * irq event handler completes before caching new event to prevent
3276 * losing events.
3277 */
3278 if (evt->flags & DWC3_EVENT_PENDING)
3279 return IRQ_HANDLED;
3280
3281 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
3282 count &= DWC3_GEVNTCOUNT_MASK;
3283 if (!count)
3284 return IRQ_NONE;
3285
3286 evt->count = count;
3287 evt->flags |= DWC3_EVENT_PENDING;
3288
3289 /* Mask interrupt */
3290 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
3291 reg |= DWC3_GEVNTSIZ_INTMASK;
3292 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
3293
3294 amount = min(count, evt->length - evt->lpos);
3295 memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
3296
3297 if (amount < count)
3298 memcpy(evt->cache, evt->buf, count - amount);
3299
3300 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
3301
3302 return IRQ_WAKE_THREAD;
3303 }
3304
3305 static irqreturn_t dwc3_interrupt(int irq, void *_evt)
3306 {
3307 struct dwc3_event_buffer *evt = _evt;
3308
3309 return dwc3_check_event_buf(evt);
3310 }
3311
3312 static int dwc3_gadget_get_irq(struct dwc3 *dwc)
3313 {
3314 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
3315 int irq;
3316
3317 irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
3318 if (irq > 0)
3319 goto out;
3320
3321 if (irq == -EPROBE_DEFER)
3322 goto out;
3323
3324 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
3325 if (irq > 0)
3326 goto out;
3327
3328 if (irq == -EPROBE_DEFER)
3329 goto out;
3330
3331 irq = platform_get_irq(dwc3_pdev, 0);
3332 if (irq > 0)
3333 goto out;
3334
3335 if (!irq)
3336 irq = -EINVAL;
3337
3338 out:
3339 return irq;
3340 }
3341
3342 /**
3343 * dwc3_gadget_init - initializes gadget related registers
3344 * @dwc: pointer to our controller context structure
3345 *
3346 * Returns 0 on success otherwise negative errno.
3347 */
3348 int dwc3_gadget_init(struct dwc3 *dwc)
3349 {
3350 int ret;
3351 int irq;
3352
3353 irq = dwc3_gadget_get_irq(dwc);
3354 if (irq < 0) {
3355 ret = irq;
3356 goto err0;
3357 }
3358
3359 dwc->irq_gadget = irq;
3360
3361 dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
3362 sizeof(*dwc->ep0_trb) * 2,
3363 &dwc->ep0_trb_addr, GFP_KERNEL);
3364 if (!dwc->ep0_trb) {
3365 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
3366 ret = -ENOMEM;
3367 goto err0;
3368 }
3369
3370 dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
3371 if (!dwc->setup_buf) {
3372 ret = -ENOMEM;
3373 goto err1;
3374 }
3375
3376 dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
3377 &dwc->bounce_addr, GFP_KERNEL);
3378 if (!dwc->bounce) {
3379 ret = -ENOMEM;
3380 goto err2;
3381 }
3382
3383 init_completion(&dwc->ep0_in_setup);
3384
3385 dwc->gadget.ops = &dwc3_gadget_ops;
3386 dwc->gadget.speed = USB_SPEED_UNKNOWN;
3387 dwc->gadget.sg_supported = true;
3388 dwc->gadget.name = "dwc3-gadget";
3389 dwc->gadget.lpm_capable = true;
3390
3391 /*
3392 * FIXME We might be setting max_speed to <SUPER, however versions
3393 * <2.20a of dwc3 have an issue with metastability (documented
3394 * elsewhere in this driver) which tells us we can't set max speed to
3395 * anything lower than SUPER.
3396 *
3397 * Because gadget.max_speed is only used by composite.c and function
3398 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
3399 * to happen so we avoid sending SuperSpeed Capability descriptor
3400 * together with our BOS descriptor as that could confuse host into
3401 * thinking we can handle super speed.
3402 *
3403 * Note that, in fact, we won't even support GetBOS requests when speed
3404 * is less than super speed because we don't have means, yet, to tell
3405 * composite.c that we are USB 2.0 + LPM ECN.
3406 */
3407 if (dwc->revision < DWC3_REVISION_220A &&
3408 !dwc->dis_metastability_quirk)
3409 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
3410 dwc->revision);
3411
3412 dwc->gadget.max_speed = dwc->maximum_speed;
3413
3414 /*
3415 * REVISIT: Here we should clear all pending IRQs to be
3416 * sure we're starting from a well known location.
3417 */
3418
3419 ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
3420 if (ret)
3421 goto err3;
3422
3423 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
3424 if (ret) {
3425 dev_err(dwc->dev, "failed to register udc\n");
3426 goto err4;
3427 }
3428
3429 dwc3_gadget_set_speed(&dwc->gadget, dwc->maximum_speed);
3430
3431 return 0;
3432
3433 err4:
3434 dwc3_gadget_free_endpoints(dwc);
3435
3436 err3:
3437 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
3438 dwc->bounce_addr);
3439
3440 err2:
3441 kfree(dwc->setup_buf);
3442
3443 err1:
3444 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3445 dwc->ep0_trb, dwc->ep0_trb_addr);
3446
3447 err0:
3448 return ret;
3449 }
3450
3451 /* -------------------------------------------------------------------------- */
3452
3453 void dwc3_gadget_exit(struct dwc3 *dwc)
3454 {
3455 usb_del_gadget_udc(&dwc->gadget);
3456 dwc3_gadget_free_endpoints(dwc);
3457 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
3458 dwc->bounce_addr);
3459 kfree(dwc->setup_buf);
3460 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3461 dwc->ep0_trb, dwc->ep0_trb_addr);
3462 }
3463
3464 int dwc3_gadget_suspend(struct dwc3 *dwc)
3465 {
3466 if (!dwc->gadget_driver)
3467 return 0;
3468
3469 dwc3_gadget_run_stop(dwc, false, false);
3470 dwc3_disconnect_gadget(dwc);
3471 __dwc3_gadget_stop(dwc);
3472
3473 return 0;
3474 }
3475
3476 int dwc3_gadget_resume(struct dwc3 *dwc)
3477 {
3478 int ret;
3479
3480 if (!dwc->gadget_driver)
3481 return 0;
3482
3483 ret = __dwc3_gadget_start(dwc);
3484 if (ret < 0)
3485 goto err0;
3486
3487 ret = dwc3_gadget_run_stop(dwc, true, false);
3488 if (ret < 0)
3489 goto err1;
3490
3491 return 0;
3492
3493 err1:
3494 __dwc3_gadget_stop(dwc);
3495
3496 err0:
3497 return ret;
3498 }
3499
3500 void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
3501 {
3502 if (dwc->pending_events) {
3503 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
3504 dwc->pending_events = false;
3505 enable_irq(dwc->irq_gadget);
3506 }
3507 }