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usb: dwc3: Validate the maximum_speed parameter
[deliverable/linux.git] / drivers / usb / dwc3 / gadget.c
1 /**
2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <linux/spinlock.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/list.h>
28 #include <linux/dma-mapping.h>
29
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
32
33 #include "debug.h"
34 #include "core.h"
35 #include "gadget.h"
36 #include "io.h"
37
38 /**
39 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
40 * @dwc: pointer to our context structure
41 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
42 *
43 * Caller should take care of locking. This function will
44 * return 0 on success or -EINVAL if wrong Test Selector
45 * is passed
46 */
47 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
48 {
49 u32 reg;
50
51 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
52 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
53
54 switch (mode) {
55 case TEST_J:
56 case TEST_K:
57 case TEST_SE0_NAK:
58 case TEST_PACKET:
59 case TEST_FORCE_EN:
60 reg |= mode << 1;
61 break;
62 default:
63 return -EINVAL;
64 }
65
66 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
67
68 return 0;
69 }
70
71 /**
72 * dwc3_gadget_get_link_state - Gets current state of USB Link
73 * @dwc: pointer to our context structure
74 *
75 * Caller should take care of locking. This function will
76 * return the link state on success (>= 0) or -ETIMEDOUT.
77 */
78 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
79 {
80 u32 reg;
81
82 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
83
84 return DWC3_DSTS_USBLNKST(reg);
85 }
86
87 /**
88 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
89 * @dwc: pointer to our context structure
90 * @state: the state to put link into
91 *
92 * Caller should take care of locking. This function will
93 * return 0 on success or -ETIMEDOUT.
94 */
95 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
96 {
97 int retries = 10000;
98 u32 reg;
99
100 /*
101 * Wait until device controller is ready. Only applies to 1.94a and
102 * later RTL.
103 */
104 if (dwc->revision >= DWC3_REVISION_194A) {
105 while (--retries) {
106 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
107 if (reg & DWC3_DSTS_DCNRD)
108 udelay(5);
109 else
110 break;
111 }
112
113 if (retries <= 0)
114 return -ETIMEDOUT;
115 }
116
117 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
118 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
119
120 /* set requested state */
121 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
122 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
123
124 /*
125 * The following code is racy when called from dwc3_gadget_wakeup,
126 * and is not needed, at least on newer versions
127 */
128 if (dwc->revision >= DWC3_REVISION_194A)
129 return 0;
130
131 /* wait for a change in DSTS */
132 retries = 10000;
133 while (--retries) {
134 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
135
136 if (DWC3_DSTS_USBLNKST(reg) == state)
137 return 0;
138
139 udelay(5);
140 }
141
142 dwc3_trace(trace_dwc3_gadget,
143 "link state change request timed out");
144
145 return -ETIMEDOUT;
146 }
147
148 /**
149 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
150 * @dwc: pointer to our context structure
151 *
152 * This function will a best effort FIFO allocation in order
153 * to improve FIFO usage and throughput, while still allowing
154 * us to enable as many endpoints as possible.
155 *
156 * Keep in mind that this operation will be highly dependent
157 * on the configured size for RAM1 - which contains TxFifo -,
158 * the amount of endpoints enabled on coreConsultant tool, and
159 * the width of the Master Bus.
160 *
161 * In the ideal world, we would always be able to satisfy the
162 * following equation:
163 *
164 * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
165 * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
166 *
167 * Unfortunately, due to many variables that's not always the case.
168 */
169 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
170 {
171 int last_fifo_depth = 0;
172 int ram1_depth;
173 int fifo_size;
174 int mdwidth;
175 int num;
176
177 if (!dwc->needs_fifo_resize)
178 return 0;
179
180 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
181 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
182
183 /* MDWIDTH is represented in bits, we need it in bytes */
184 mdwidth >>= 3;
185
186 /*
187 * FIXME For now we will only allocate 1 wMaxPacketSize space
188 * for each enabled endpoint, later patches will come to
189 * improve this algorithm so that we better use the internal
190 * FIFO space
191 */
192 for (num = 0; num < dwc->num_in_eps; num++) {
193 /* bit0 indicates direction; 1 means IN ep */
194 struct dwc3_ep *dep = dwc->eps[(num << 1) | 1];
195 int mult = 1;
196 int tmp;
197
198 if (!(dep->flags & DWC3_EP_ENABLED))
199 continue;
200
201 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
202 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
203 mult = 3;
204
205 /*
206 * REVISIT: the following assumes we will always have enough
207 * space available on the FIFO RAM for all possible use cases.
208 * Make sure that's true somehow and change FIFO allocation
209 * accordingly.
210 *
211 * If we have Bulk or Isochronous endpoints, we want
212 * them to be able to be very, very fast. So we're giving
213 * those endpoints a fifo_size which is enough for 3 full
214 * packets
215 */
216 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
217 tmp += mdwidth;
218
219 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
220
221 fifo_size |= (last_fifo_depth << 16);
222
223 dwc3_trace(trace_dwc3_gadget, "%s: Fifo Addr %04x Size %d",
224 dep->name, last_fifo_depth, fifo_size & 0xffff);
225
226 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
227
228 last_fifo_depth += (fifo_size & 0xffff);
229 }
230
231 return 0;
232 }
233
234 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
235 int status)
236 {
237 struct dwc3 *dwc = dep->dwc;
238 int i;
239
240 if (req->queued) {
241 i = 0;
242 do {
243 dep->busy_slot++;
244 /*
245 * Skip LINK TRB. We can't use req->trb and check for
246 * DWC3_TRBCTL_LINK_TRB because it points the TRB we
247 * just completed (not the LINK TRB).
248 */
249 if (((dep->busy_slot & DWC3_TRB_MASK) ==
250 DWC3_TRB_NUM- 1) &&
251 usb_endpoint_xfer_isoc(dep->endpoint.desc))
252 dep->busy_slot++;
253 } while(++i < req->request.num_mapped_sgs);
254 req->queued = false;
255 }
256 list_del(&req->list);
257 req->trb = NULL;
258
259 if (req->request.status == -EINPROGRESS)
260 req->request.status = status;
261
262 if (dwc->ep0_bounced && dep->number == 0)
263 dwc->ep0_bounced = false;
264 else
265 usb_gadget_unmap_request(&dwc->gadget, &req->request,
266 req->direction);
267
268 trace_dwc3_gadget_giveback(req);
269
270 spin_unlock(&dwc->lock);
271 usb_gadget_giveback_request(&dep->endpoint, &req->request);
272 spin_lock(&dwc->lock);
273 }
274
275 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
276 {
277 u32 timeout = 500;
278 u32 reg;
279
280 trace_dwc3_gadget_generic_cmd(cmd, param);
281
282 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
283 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
284
285 do {
286 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
287 if (!(reg & DWC3_DGCMD_CMDACT)) {
288 dwc3_trace(trace_dwc3_gadget,
289 "Command Complete --> %d",
290 DWC3_DGCMD_STATUS(reg));
291 if (DWC3_DGCMD_STATUS(reg))
292 return -EINVAL;
293 return 0;
294 }
295
296 /*
297 * We can't sleep here, because it's also called from
298 * interrupt context.
299 */
300 timeout--;
301 if (!timeout) {
302 dwc3_trace(trace_dwc3_gadget,
303 "Command Timed Out");
304 return -ETIMEDOUT;
305 }
306 udelay(1);
307 } while (1);
308 }
309
310 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
311 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
312 {
313 struct dwc3_ep *dep = dwc->eps[ep];
314 u32 timeout = 500;
315 u32 reg;
316
317 trace_dwc3_gadget_ep_cmd(dep, cmd, params);
318
319 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
320 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
321 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
322
323 dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
324 do {
325 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
326 if (!(reg & DWC3_DEPCMD_CMDACT)) {
327 dwc3_trace(trace_dwc3_gadget,
328 "Command Complete --> %d",
329 DWC3_DEPCMD_STATUS(reg));
330 if (DWC3_DEPCMD_STATUS(reg))
331 return -EINVAL;
332 return 0;
333 }
334
335 /*
336 * We can't sleep here, because it is also called from
337 * interrupt context.
338 */
339 timeout--;
340 if (!timeout) {
341 dwc3_trace(trace_dwc3_gadget,
342 "Command Timed Out");
343 return -ETIMEDOUT;
344 }
345
346 udelay(1);
347 } while (1);
348 }
349
350 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
351 struct dwc3_trb *trb)
352 {
353 u32 offset = (char *) trb - (char *) dep->trb_pool;
354
355 return dep->trb_pool_dma + offset;
356 }
357
358 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
359 {
360 struct dwc3 *dwc = dep->dwc;
361
362 if (dep->trb_pool)
363 return 0;
364
365 dep->trb_pool = dma_alloc_coherent(dwc->dev,
366 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
367 &dep->trb_pool_dma, GFP_KERNEL);
368 if (!dep->trb_pool) {
369 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
370 dep->name);
371 return -ENOMEM;
372 }
373
374 return 0;
375 }
376
377 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
378 {
379 struct dwc3 *dwc = dep->dwc;
380
381 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
382 dep->trb_pool, dep->trb_pool_dma);
383
384 dep->trb_pool = NULL;
385 dep->trb_pool_dma = 0;
386 }
387
388 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
389
390 /**
391 * dwc3_gadget_start_config - Configure EP resources
392 * @dwc: pointer to our controller context structure
393 * @dep: endpoint that is being enabled
394 *
395 * The assignment of transfer resources cannot perfectly follow the
396 * data book due to the fact that the controller driver does not have
397 * all knowledge of the configuration in advance. It is given this
398 * information piecemeal by the composite gadget framework after every
399 * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
400 * programming model in this scenario can cause errors. For two
401 * reasons:
402 *
403 * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
404 * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
405 * multiple interfaces.
406 *
407 * 2) The databook does not mention doing more DEPXFERCFG for new
408 * endpoint on alt setting (8.1.6).
409 *
410 * The following simplified method is used instead:
411 *
412 * All hardware endpoints can be assigned a transfer resource and this
413 * setting will stay persistent until either a core reset or
414 * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
415 * do DEPXFERCFG for every hardware endpoint as well. We are
416 * guaranteed that there are as many transfer resources as endpoints.
417 *
418 * This function is called for each endpoint when it is being enabled
419 * but is triggered only when called for EP0-out, which always happens
420 * first, and which should only happen in one of the above conditions.
421 */
422 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
423 {
424 struct dwc3_gadget_ep_cmd_params params;
425 u32 cmd;
426 int i;
427 int ret;
428
429 if (dep->number)
430 return 0;
431
432 memset(&params, 0x00, sizeof(params));
433 cmd = DWC3_DEPCMD_DEPSTARTCFG;
434
435 ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
436 if (ret)
437 return ret;
438
439 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
440 struct dwc3_ep *dep = dwc->eps[i];
441
442 if (!dep)
443 continue;
444
445 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
446 if (ret)
447 return ret;
448 }
449
450 return 0;
451 }
452
453 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
454 const struct usb_endpoint_descriptor *desc,
455 const struct usb_ss_ep_comp_descriptor *comp_desc,
456 bool ignore, bool restore)
457 {
458 struct dwc3_gadget_ep_cmd_params params;
459
460 memset(&params, 0x00, sizeof(params));
461
462 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
463 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
464
465 /* Burst size is only needed in SuperSpeed mode */
466 if (dwc->gadget.speed >= USB_SPEED_SUPER) {
467 u32 burst = dep->endpoint.maxburst - 1;
468
469 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
470 }
471
472 if (ignore)
473 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
474
475 if (restore) {
476 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
477 params.param2 |= dep->saved_state;
478 }
479
480 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
481 | DWC3_DEPCFG_XFER_NOT_READY_EN;
482
483 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
484 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
485 | DWC3_DEPCFG_STREAM_EVENT_EN;
486 dep->stream_capable = true;
487 }
488
489 if (!usb_endpoint_xfer_control(desc))
490 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
491
492 /*
493 * We are doing 1:1 mapping for endpoints, meaning
494 * Physical Endpoints 2 maps to Logical Endpoint 2 and
495 * so on. We consider the direction bit as part of the physical
496 * endpoint number. So USB endpoint 0x81 is 0x03.
497 */
498 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
499
500 /*
501 * We must use the lower 16 TX FIFOs even though
502 * HW might have more
503 */
504 if (dep->direction)
505 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
506
507 if (desc->bInterval) {
508 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
509 dep->interval = 1 << (desc->bInterval - 1);
510 }
511
512 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
513 DWC3_DEPCMD_SETEPCONFIG, &params);
514 }
515
516 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
517 {
518 struct dwc3_gadget_ep_cmd_params params;
519
520 memset(&params, 0x00, sizeof(params));
521
522 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
523
524 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
525 DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
526 }
527
528 /**
529 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
530 * @dep: endpoint to be initialized
531 * @desc: USB Endpoint Descriptor
532 *
533 * Caller should take care of locking
534 */
535 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
536 const struct usb_endpoint_descriptor *desc,
537 const struct usb_ss_ep_comp_descriptor *comp_desc,
538 bool ignore, bool restore)
539 {
540 struct dwc3 *dwc = dep->dwc;
541 u32 reg;
542 int ret;
543
544 dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name);
545
546 if (!(dep->flags & DWC3_EP_ENABLED)) {
547 ret = dwc3_gadget_start_config(dwc, dep);
548 if (ret)
549 return ret;
550 }
551
552 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
553 restore);
554 if (ret)
555 return ret;
556
557 if (!(dep->flags & DWC3_EP_ENABLED)) {
558 struct dwc3_trb *trb_st_hw;
559 struct dwc3_trb *trb_link;
560
561 dep->endpoint.desc = desc;
562 dep->comp_desc = comp_desc;
563 dep->type = usb_endpoint_type(desc);
564 dep->flags |= DWC3_EP_ENABLED;
565
566 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
567 reg |= DWC3_DALEPENA_EP(dep->number);
568 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
569
570 if (!usb_endpoint_xfer_isoc(desc))
571 return 0;
572
573 /* Link TRB for ISOC. The HWO bit is never reset */
574 trb_st_hw = &dep->trb_pool[0];
575
576 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
577 memset(trb_link, 0, sizeof(*trb_link));
578
579 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
580 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
581 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
582 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
583 }
584
585 switch (usb_endpoint_type(desc)) {
586 case USB_ENDPOINT_XFER_CONTROL:
587 strlcat(dep->name, "-control", sizeof(dep->name));
588 break;
589 case USB_ENDPOINT_XFER_ISOC:
590 strlcat(dep->name, "-isoc", sizeof(dep->name));
591 break;
592 case USB_ENDPOINT_XFER_BULK:
593 strlcat(dep->name, "-bulk", sizeof(dep->name));
594 break;
595 case USB_ENDPOINT_XFER_INT:
596 strlcat(dep->name, "-int", sizeof(dep->name));
597 break;
598 default:
599 dev_err(dwc->dev, "invalid endpoint transfer type\n");
600 }
601
602 return 0;
603 }
604
605 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
606 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
607 {
608 struct dwc3_request *req;
609
610 if (!list_empty(&dep->req_queued)) {
611 dwc3_stop_active_transfer(dwc, dep->number, true);
612
613 /* - giveback all requests to gadget driver */
614 while (!list_empty(&dep->req_queued)) {
615 req = next_request(&dep->req_queued);
616
617 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
618 }
619 }
620
621 while (!list_empty(&dep->request_list)) {
622 req = next_request(&dep->request_list);
623
624 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
625 }
626 }
627
628 /**
629 * __dwc3_gadget_ep_disable - Disables a HW endpoint
630 * @dep: the endpoint to disable
631 *
632 * This function also removes requests which are currently processed ny the
633 * hardware and those which are not yet scheduled.
634 * Caller should take care of locking.
635 */
636 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
637 {
638 struct dwc3 *dwc = dep->dwc;
639 u32 reg;
640
641 dwc3_trace(trace_dwc3_gadget, "Disabling %s", dep->name);
642
643 dwc3_remove_requests(dwc, dep);
644
645 /* make sure HW endpoint isn't stalled */
646 if (dep->flags & DWC3_EP_STALL)
647 __dwc3_gadget_ep_set_halt(dep, 0, false);
648
649 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
650 reg &= ~DWC3_DALEPENA_EP(dep->number);
651 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
652
653 dep->stream_capable = false;
654 dep->endpoint.desc = NULL;
655 dep->comp_desc = NULL;
656 dep->type = 0;
657 dep->flags = 0;
658
659 snprintf(dep->name, sizeof(dep->name), "ep%d%s",
660 dep->number >> 1,
661 (dep->number & 1) ? "in" : "out");
662
663 return 0;
664 }
665
666 /* -------------------------------------------------------------------------- */
667
668 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
669 const struct usb_endpoint_descriptor *desc)
670 {
671 return -EINVAL;
672 }
673
674 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
675 {
676 return -EINVAL;
677 }
678
679 /* -------------------------------------------------------------------------- */
680
681 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
682 const struct usb_endpoint_descriptor *desc)
683 {
684 struct dwc3_ep *dep;
685 struct dwc3 *dwc;
686 unsigned long flags;
687 int ret;
688
689 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
690 pr_debug("dwc3: invalid parameters\n");
691 return -EINVAL;
692 }
693
694 if (!desc->wMaxPacketSize) {
695 pr_debug("dwc3: missing wMaxPacketSize\n");
696 return -EINVAL;
697 }
698
699 dep = to_dwc3_ep(ep);
700 dwc = dep->dwc;
701
702 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
703 "%s is already enabled\n",
704 dep->name))
705 return 0;
706
707 spin_lock_irqsave(&dwc->lock, flags);
708 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
709 spin_unlock_irqrestore(&dwc->lock, flags);
710
711 return ret;
712 }
713
714 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
715 {
716 struct dwc3_ep *dep;
717 struct dwc3 *dwc;
718 unsigned long flags;
719 int ret;
720
721 if (!ep) {
722 pr_debug("dwc3: invalid parameters\n");
723 return -EINVAL;
724 }
725
726 dep = to_dwc3_ep(ep);
727 dwc = dep->dwc;
728
729 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
730 "%s is already disabled\n",
731 dep->name))
732 return 0;
733
734 spin_lock_irqsave(&dwc->lock, flags);
735 ret = __dwc3_gadget_ep_disable(dep);
736 spin_unlock_irqrestore(&dwc->lock, flags);
737
738 return ret;
739 }
740
741 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
742 gfp_t gfp_flags)
743 {
744 struct dwc3_request *req;
745 struct dwc3_ep *dep = to_dwc3_ep(ep);
746
747 req = kzalloc(sizeof(*req), gfp_flags);
748 if (!req)
749 return NULL;
750
751 req->epnum = dep->number;
752 req->dep = dep;
753
754 trace_dwc3_alloc_request(req);
755
756 return &req->request;
757 }
758
759 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
760 struct usb_request *request)
761 {
762 struct dwc3_request *req = to_dwc3_request(request);
763
764 trace_dwc3_free_request(req);
765 kfree(req);
766 }
767
768 /**
769 * dwc3_prepare_one_trb - setup one TRB from one request
770 * @dep: endpoint for which this request is prepared
771 * @req: dwc3_request pointer
772 */
773 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
774 struct dwc3_request *req, dma_addr_t dma,
775 unsigned length, unsigned last, unsigned chain, unsigned node)
776 {
777 struct dwc3_trb *trb;
778
779 dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s%s",
780 dep->name, req, (unsigned long long) dma,
781 length, last ? " last" : "",
782 chain ? " chain" : "");
783
784
785 trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
786
787 if (!req->trb) {
788 dwc3_gadget_move_request_queued(req);
789 req->trb = trb;
790 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
791 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
792 }
793
794 dep->free_slot++;
795 /* Skip the LINK-TRB on ISOC */
796 if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
797 usb_endpoint_xfer_isoc(dep->endpoint.desc))
798 dep->free_slot++;
799
800 trb->size = DWC3_TRB_SIZE_LENGTH(length);
801 trb->bpl = lower_32_bits(dma);
802 trb->bph = upper_32_bits(dma);
803
804 switch (usb_endpoint_type(dep->endpoint.desc)) {
805 case USB_ENDPOINT_XFER_CONTROL:
806 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
807 break;
808
809 case USB_ENDPOINT_XFER_ISOC:
810 if (!node)
811 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
812 else
813 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
814 break;
815
816 case USB_ENDPOINT_XFER_BULK:
817 case USB_ENDPOINT_XFER_INT:
818 trb->ctrl = DWC3_TRBCTL_NORMAL;
819 break;
820 default:
821 /*
822 * This is only possible with faulty memory because we
823 * checked it already :)
824 */
825 BUG();
826 }
827
828 if (!req->request.no_interrupt && !chain)
829 trb->ctrl |= DWC3_TRB_CTRL_IOC;
830
831 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
832 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
833 trb->ctrl |= DWC3_TRB_CTRL_CSP;
834 } else if (last) {
835 trb->ctrl |= DWC3_TRB_CTRL_LST;
836 }
837
838 if (chain)
839 trb->ctrl |= DWC3_TRB_CTRL_CHN;
840
841 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
842 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
843
844 trb->ctrl |= DWC3_TRB_CTRL_HWO;
845
846 trace_dwc3_prepare_trb(dep, trb);
847 }
848
849 /*
850 * dwc3_prepare_trbs - setup TRBs from requests
851 * @dep: endpoint for which requests are being prepared
852 * @starting: true if the endpoint is idle and no requests are queued.
853 *
854 * The function goes through the requests list and sets up TRBs for the
855 * transfers. The function returns once there are no more TRBs available or
856 * it runs out of requests.
857 */
858 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
859 {
860 struct dwc3_request *req, *n;
861 u32 trbs_left;
862 u32 max;
863 unsigned int last_one = 0;
864
865 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
866
867 /* the first request must not be queued */
868 trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
869
870 /* Can't wrap around on a non-isoc EP since there's no link TRB */
871 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
872 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
873 if (trbs_left > max)
874 trbs_left = max;
875 }
876
877 /*
878 * If busy & slot are equal than it is either full or empty. If we are
879 * starting to process requests then we are empty. Otherwise we are
880 * full and don't do anything
881 */
882 if (!trbs_left) {
883 if (!starting)
884 return;
885 trbs_left = DWC3_TRB_NUM;
886 /*
887 * In case we start from scratch, we queue the ISOC requests
888 * starting from slot 1. This is done because we use ring
889 * buffer and have no LST bit to stop us. Instead, we place
890 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
891 * after the first request so we start at slot 1 and have
892 * 7 requests proceed before we hit the first IOC.
893 * Other transfer types don't use the ring buffer and are
894 * processed from the first TRB until the last one. Since we
895 * don't wrap around we have to start at the beginning.
896 */
897 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
898 dep->busy_slot = 1;
899 dep->free_slot = 1;
900 } else {
901 dep->busy_slot = 0;
902 dep->free_slot = 0;
903 }
904 }
905
906 /* The last TRB is a link TRB, not used for xfer */
907 if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
908 return;
909
910 list_for_each_entry_safe(req, n, &dep->request_list, list) {
911 unsigned length;
912 dma_addr_t dma;
913 last_one = false;
914
915 if (req->request.num_mapped_sgs > 0) {
916 struct usb_request *request = &req->request;
917 struct scatterlist *sg = request->sg;
918 struct scatterlist *s;
919 int i;
920
921 for_each_sg(sg, s, request->num_mapped_sgs, i) {
922 unsigned chain = true;
923
924 length = sg_dma_len(s);
925 dma = sg_dma_address(s);
926
927 if (i == (request->num_mapped_sgs - 1) ||
928 sg_is_last(s)) {
929 if (list_empty(&dep->request_list))
930 last_one = true;
931 chain = false;
932 }
933
934 trbs_left--;
935 if (!trbs_left)
936 last_one = true;
937
938 if (last_one)
939 chain = false;
940
941 dwc3_prepare_one_trb(dep, req, dma, length,
942 last_one, chain, i);
943
944 if (last_one)
945 break;
946 }
947
948 if (last_one)
949 break;
950 } else {
951 dma = req->request.dma;
952 length = req->request.length;
953 trbs_left--;
954
955 if (!trbs_left)
956 last_one = 1;
957
958 /* Is this the last request? */
959 if (list_is_last(&req->list, &dep->request_list))
960 last_one = 1;
961
962 dwc3_prepare_one_trb(dep, req, dma, length,
963 last_one, false, 0);
964
965 if (last_one)
966 break;
967 }
968 }
969 }
970
971 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
972 int start_new)
973 {
974 struct dwc3_gadget_ep_cmd_params params;
975 struct dwc3_request *req;
976 struct dwc3 *dwc = dep->dwc;
977 int ret;
978 u32 cmd;
979
980 if (start_new && (dep->flags & DWC3_EP_BUSY)) {
981 dwc3_trace(trace_dwc3_gadget, "%s: endpoint busy", dep->name);
982 return -EBUSY;
983 }
984
985 /*
986 * If we are getting here after a short-out-packet we don't enqueue any
987 * new requests as we try to set the IOC bit only on the last request.
988 */
989 if (start_new) {
990 if (list_empty(&dep->req_queued))
991 dwc3_prepare_trbs(dep, start_new);
992
993 /* req points to the first request which will be sent */
994 req = next_request(&dep->req_queued);
995 } else {
996 dwc3_prepare_trbs(dep, start_new);
997
998 /*
999 * req points to the first request where HWO changed from 0 to 1
1000 */
1001 req = next_request(&dep->req_queued);
1002 }
1003 if (!req) {
1004 dep->flags |= DWC3_EP_PENDING_REQUEST;
1005 return 0;
1006 }
1007
1008 memset(&params, 0, sizeof(params));
1009
1010 if (start_new) {
1011 params.param0 = upper_32_bits(req->trb_dma);
1012 params.param1 = lower_32_bits(req->trb_dma);
1013 cmd = DWC3_DEPCMD_STARTTRANSFER;
1014 } else {
1015 cmd = DWC3_DEPCMD_UPDATETRANSFER;
1016 }
1017
1018 cmd |= DWC3_DEPCMD_PARAM(cmd_param);
1019 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
1020 if (ret < 0) {
1021 /*
1022 * FIXME we need to iterate over the list of requests
1023 * here and stop, unmap, free and del each of the linked
1024 * requests instead of what we do now.
1025 */
1026 usb_gadget_unmap_request(&dwc->gadget, &req->request,
1027 req->direction);
1028 list_del(&req->list);
1029 return ret;
1030 }
1031
1032 dep->flags |= DWC3_EP_BUSY;
1033
1034 if (start_new) {
1035 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
1036 dep->number);
1037 WARN_ON_ONCE(!dep->resource_index);
1038 }
1039
1040 return 0;
1041 }
1042
1043 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1044 struct dwc3_ep *dep, u32 cur_uf)
1045 {
1046 u32 uf;
1047
1048 if (list_empty(&dep->request_list)) {
1049 dwc3_trace(trace_dwc3_gadget,
1050 "ISOC ep %s run out for requests",
1051 dep->name);
1052 dep->flags |= DWC3_EP_PENDING_REQUEST;
1053 return;
1054 }
1055
1056 /* 4 micro frames in the future */
1057 uf = cur_uf + dep->interval * 4;
1058
1059 __dwc3_gadget_kick_transfer(dep, uf, 1);
1060 }
1061
1062 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1063 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1064 {
1065 u32 cur_uf, mask;
1066
1067 mask = ~(dep->interval - 1);
1068 cur_uf = event->parameters & mask;
1069
1070 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1071 }
1072
1073 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1074 {
1075 struct dwc3 *dwc = dep->dwc;
1076 int ret;
1077
1078 if (!dep->endpoint.desc) {
1079 dwc3_trace(trace_dwc3_gadget,
1080 "trying to queue request %p to disabled %s\n",
1081 &req->request, dep->endpoint.name);
1082 return -ESHUTDOWN;
1083 }
1084
1085 if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1086 &req->request, req->dep->name)) {
1087 dwc3_trace(trace_dwc3_gadget, "request %p belongs to '%s'\n",
1088 &req->request, req->dep->name);
1089 return -EINVAL;
1090 }
1091
1092 req->request.actual = 0;
1093 req->request.status = -EINPROGRESS;
1094 req->direction = dep->direction;
1095 req->epnum = dep->number;
1096
1097 trace_dwc3_ep_queue(req);
1098
1099 /*
1100 * We only add to our list of requests now and
1101 * start consuming the list once we get XferNotReady
1102 * IRQ.
1103 *
1104 * That way, we avoid doing anything that we don't need
1105 * to do now and defer it until the point we receive a
1106 * particular token from the Host side.
1107 *
1108 * This will also avoid Host cancelling URBs due to too
1109 * many NAKs.
1110 */
1111 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1112 dep->direction);
1113 if (ret)
1114 return ret;
1115
1116 list_add_tail(&req->list, &dep->request_list);
1117
1118 /*
1119 * If there are no pending requests and the endpoint isn't already
1120 * busy, we will just start the request straight away.
1121 *
1122 * This will save one IRQ (XFER_NOT_READY) and possibly make it a
1123 * little bit faster.
1124 */
1125 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1126 !usb_endpoint_xfer_int(dep->endpoint.desc) &&
1127 !(dep->flags & DWC3_EP_BUSY)) {
1128 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1129 goto out;
1130 }
1131
1132 /*
1133 * There are a few special cases:
1134 *
1135 * 1. XferNotReady with empty list of requests. We need to kick the
1136 * transfer here in that situation, otherwise we will be NAKing
1137 * forever. If we get XferNotReady before gadget driver has a
1138 * chance to queue a request, we will ACK the IRQ but won't be
1139 * able to receive the data until the next request is queued.
1140 * The following code is handling exactly that.
1141 *
1142 */
1143 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1144 /*
1145 * If xfernotready is already elapsed and it is a case
1146 * of isoc transfer, then issue END TRANSFER, so that
1147 * you can receive xfernotready again and can have
1148 * notion of current microframe.
1149 */
1150 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1151 if (list_empty(&dep->req_queued)) {
1152 dwc3_stop_active_transfer(dwc, dep->number, true);
1153 dep->flags = DWC3_EP_ENABLED;
1154 }
1155 return 0;
1156 }
1157
1158 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1159 if (!ret)
1160 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
1161
1162 goto out;
1163 }
1164
1165 /*
1166 * 2. XferInProgress on Isoc EP with an active transfer. We need to
1167 * kick the transfer here after queuing a request, otherwise the
1168 * core may not see the modified TRB(s).
1169 */
1170 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1171 (dep->flags & DWC3_EP_BUSY) &&
1172 !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1173 WARN_ON_ONCE(!dep->resource_index);
1174 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1175 false);
1176 goto out;
1177 }
1178
1179 /*
1180 * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1181 * right away, otherwise host will not know we have streams to be
1182 * handled.
1183 */
1184 if (dep->stream_capable)
1185 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1186
1187 out:
1188 if (ret && ret != -EBUSY)
1189 dwc3_trace(trace_dwc3_gadget,
1190 "%s: failed to kick transfers\n",
1191 dep->name);
1192 if (ret == -EBUSY)
1193 ret = 0;
1194
1195 return ret;
1196 }
1197
1198 static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep,
1199 struct usb_request *request)
1200 {
1201 dwc3_gadget_ep_free_request(ep, request);
1202 }
1203
1204 static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep)
1205 {
1206 struct dwc3_request *req;
1207 struct usb_request *request;
1208 struct usb_ep *ep = &dep->endpoint;
1209
1210 dwc3_trace(trace_dwc3_gadget, "queueing ZLP\n");
1211 request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
1212 if (!request)
1213 return -ENOMEM;
1214
1215 request->length = 0;
1216 request->buf = dwc->zlp_buf;
1217 request->complete = __dwc3_gadget_ep_zlp_complete;
1218
1219 req = to_dwc3_request(request);
1220
1221 return __dwc3_gadget_ep_queue(dep, req);
1222 }
1223
1224 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1225 gfp_t gfp_flags)
1226 {
1227 struct dwc3_request *req = to_dwc3_request(request);
1228 struct dwc3_ep *dep = to_dwc3_ep(ep);
1229 struct dwc3 *dwc = dep->dwc;
1230
1231 unsigned long flags;
1232
1233 int ret;
1234
1235 spin_lock_irqsave(&dwc->lock, flags);
1236 ret = __dwc3_gadget_ep_queue(dep, req);
1237
1238 /*
1239 * Okay, here's the thing, if gadget driver has requested for a ZLP by
1240 * setting request->zero, instead of doing magic, we will just queue an
1241 * extra usb_request ourselves so that it gets handled the same way as
1242 * any other request.
1243 */
1244 if (ret == 0 && request->zero && request->length &&
1245 (request->length % ep->maxpacket == 0))
1246 ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
1247
1248 spin_unlock_irqrestore(&dwc->lock, flags);
1249
1250 return ret;
1251 }
1252
1253 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1254 struct usb_request *request)
1255 {
1256 struct dwc3_request *req = to_dwc3_request(request);
1257 struct dwc3_request *r = NULL;
1258
1259 struct dwc3_ep *dep = to_dwc3_ep(ep);
1260 struct dwc3 *dwc = dep->dwc;
1261
1262 unsigned long flags;
1263 int ret = 0;
1264
1265 trace_dwc3_ep_dequeue(req);
1266
1267 spin_lock_irqsave(&dwc->lock, flags);
1268
1269 list_for_each_entry(r, &dep->request_list, list) {
1270 if (r == req)
1271 break;
1272 }
1273
1274 if (r != req) {
1275 list_for_each_entry(r, &dep->req_queued, list) {
1276 if (r == req)
1277 break;
1278 }
1279 if (r == req) {
1280 /* wait until it is processed */
1281 dwc3_stop_active_transfer(dwc, dep->number, true);
1282 goto out1;
1283 }
1284 dev_err(dwc->dev, "request %p was not queued to %s\n",
1285 request, ep->name);
1286 ret = -EINVAL;
1287 goto out0;
1288 }
1289
1290 out1:
1291 /* giveback the request */
1292 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1293
1294 out0:
1295 spin_unlock_irqrestore(&dwc->lock, flags);
1296
1297 return ret;
1298 }
1299
1300 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1301 {
1302 struct dwc3_gadget_ep_cmd_params params;
1303 struct dwc3 *dwc = dep->dwc;
1304 int ret;
1305
1306 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1307 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1308 return -EINVAL;
1309 }
1310
1311 memset(&params, 0x00, sizeof(params));
1312
1313 if (value) {
1314 if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
1315 (!list_empty(&dep->req_queued) ||
1316 !list_empty(&dep->request_list)))) {
1317 dwc3_trace(trace_dwc3_gadget,
1318 "%s: pending request, cannot halt\n",
1319 dep->name);
1320 return -EAGAIN;
1321 }
1322
1323 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1324 DWC3_DEPCMD_SETSTALL, &params);
1325 if (ret)
1326 dev_err(dwc->dev, "failed to set STALL on %s\n",
1327 dep->name);
1328 else
1329 dep->flags |= DWC3_EP_STALL;
1330 } else {
1331 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1332 DWC3_DEPCMD_CLEARSTALL, &params);
1333 if (ret)
1334 dev_err(dwc->dev, "failed to clear STALL on %s\n",
1335 dep->name);
1336 else
1337 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1338 }
1339
1340 return ret;
1341 }
1342
1343 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1344 {
1345 struct dwc3_ep *dep = to_dwc3_ep(ep);
1346 struct dwc3 *dwc = dep->dwc;
1347
1348 unsigned long flags;
1349
1350 int ret;
1351
1352 spin_lock_irqsave(&dwc->lock, flags);
1353 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1354 spin_unlock_irqrestore(&dwc->lock, flags);
1355
1356 return ret;
1357 }
1358
1359 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1360 {
1361 struct dwc3_ep *dep = to_dwc3_ep(ep);
1362 struct dwc3 *dwc = dep->dwc;
1363 unsigned long flags;
1364 int ret;
1365
1366 spin_lock_irqsave(&dwc->lock, flags);
1367 dep->flags |= DWC3_EP_WEDGE;
1368
1369 if (dep->number == 0 || dep->number == 1)
1370 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1371 else
1372 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1373 spin_unlock_irqrestore(&dwc->lock, flags);
1374
1375 return ret;
1376 }
1377
1378 /* -------------------------------------------------------------------------- */
1379
1380 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1381 .bLength = USB_DT_ENDPOINT_SIZE,
1382 .bDescriptorType = USB_DT_ENDPOINT,
1383 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1384 };
1385
1386 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1387 .enable = dwc3_gadget_ep0_enable,
1388 .disable = dwc3_gadget_ep0_disable,
1389 .alloc_request = dwc3_gadget_ep_alloc_request,
1390 .free_request = dwc3_gadget_ep_free_request,
1391 .queue = dwc3_gadget_ep0_queue,
1392 .dequeue = dwc3_gadget_ep_dequeue,
1393 .set_halt = dwc3_gadget_ep0_set_halt,
1394 .set_wedge = dwc3_gadget_ep_set_wedge,
1395 };
1396
1397 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1398 .enable = dwc3_gadget_ep_enable,
1399 .disable = dwc3_gadget_ep_disable,
1400 .alloc_request = dwc3_gadget_ep_alloc_request,
1401 .free_request = dwc3_gadget_ep_free_request,
1402 .queue = dwc3_gadget_ep_queue,
1403 .dequeue = dwc3_gadget_ep_dequeue,
1404 .set_halt = dwc3_gadget_ep_set_halt,
1405 .set_wedge = dwc3_gadget_ep_set_wedge,
1406 };
1407
1408 /* -------------------------------------------------------------------------- */
1409
1410 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1411 {
1412 struct dwc3 *dwc = gadget_to_dwc(g);
1413 u32 reg;
1414
1415 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1416 return DWC3_DSTS_SOFFN(reg);
1417 }
1418
1419 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1420 {
1421 struct dwc3 *dwc = gadget_to_dwc(g);
1422
1423 unsigned long timeout;
1424 unsigned long flags;
1425
1426 u32 reg;
1427
1428 int ret = 0;
1429
1430 u8 link_state;
1431 u8 speed;
1432
1433 spin_lock_irqsave(&dwc->lock, flags);
1434
1435 /*
1436 * According to the Databook Remote wakeup request should
1437 * be issued only when the device is in early suspend state.
1438 *
1439 * We can check that via USB Link State bits in DSTS register.
1440 */
1441 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1442
1443 speed = reg & DWC3_DSTS_CONNECTSPD;
1444 if ((speed == DWC3_DSTS_SUPERSPEED) ||
1445 (speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
1446 dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed\n");
1447 ret = -EINVAL;
1448 goto out;
1449 }
1450
1451 link_state = DWC3_DSTS_USBLNKST(reg);
1452
1453 switch (link_state) {
1454 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1455 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1456 break;
1457 default:
1458 dwc3_trace(trace_dwc3_gadget,
1459 "can't wakeup from '%s'\n",
1460 dwc3_gadget_link_string(link_state));
1461 ret = -EINVAL;
1462 goto out;
1463 }
1464
1465 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1466 if (ret < 0) {
1467 dev_err(dwc->dev, "failed to put link in Recovery\n");
1468 goto out;
1469 }
1470
1471 /* Recent versions do this automatically */
1472 if (dwc->revision < DWC3_REVISION_194A) {
1473 /* write zeroes to Link Change Request */
1474 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1475 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1476 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1477 }
1478
1479 /* poll until Link State changes to ON */
1480 timeout = jiffies + msecs_to_jiffies(100);
1481
1482 while (!time_after(jiffies, timeout)) {
1483 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1484
1485 /* in HS, means ON */
1486 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1487 break;
1488 }
1489
1490 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1491 dev_err(dwc->dev, "failed to send remote wakeup\n");
1492 ret = -EINVAL;
1493 }
1494
1495 out:
1496 spin_unlock_irqrestore(&dwc->lock, flags);
1497
1498 return ret;
1499 }
1500
1501 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1502 int is_selfpowered)
1503 {
1504 struct dwc3 *dwc = gadget_to_dwc(g);
1505 unsigned long flags;
1506
1507 spin_lock_irqsave(&dwc->lock, flags);
1508 g->is_selfpowered = !!is_selfpowered;
1509 spin_unlock_irqrestore(&dwc->lock, flags);
1510
1511 return 0;
1512 }
1513
1514 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1515 {
1516 u32 reg;
1517 u32 timeout = 500;
1518
1519 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1520 if (is_on) {
1521 if (dwc->revision <= DWC3_REVISION_187A) {
1522 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1523 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1524 }
1525
1526 if (dwc->revision >= DWC3_REVISION_194A)
1527 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1528 reg |= DWC3_DCTL_RUN_STOP;
1529
1530 if (dwc->has_hibernation)
1531 reg |= DWC3_DCTL_KEEP_CONNECT;
1532
1533 dwc->pullups_connected = true;
1534 } else {
1535 reg &= ~DWC3_DCTL_RUN_STOP;
1536
1537 if (dwc->has_hibernation && !suspend)
1538 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1539
1540 dwc->pullups_connected = false;
1541 }
1542
1543 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1544
1545 do {
1546 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1547 if (is_on) {
1548 if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1549 break;
1550 } else {
1551 if (reg & DWC3_DSTS_DEVCTRLHLT)
1552 break;
1553 }
1554 timeout--;
1555 if (!timeout)
1556 return -ETIMEDOUT;
1557 udelay(1);
1558 } while (1);
1559
1560 dwc3_trace(trace_dwc3_gadget, "gadget %s data soft-%s",
1561 dwc->gadget_driver
1562 ? dwc->gadget_driver->function : "no-function",
1563 is_on ? "connect" : "disconnect");
1564
1565 return 0;
1566 }
1567
1568 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1569 {
1570 struct dwc3 *dwc = gadget_to_dwc(g);
1571 unsigned long flags;
1572 int ret;
1573
1574 is_on = !!is_on;
1575
1576 spin_lock_irqsave(&dwc->lock, flags);
1577 ret = dwc3_gadget_run_stop(dwc, is_on, false);
1578 spin_unlock_irqrestore(&dwc->lock, flags);
1579
1580 return ret;
1581 }
1582
1583 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1584 {
1585 u32 reg;
1586
1587 /* Enable all but Start and End of Frame IRQs */
1588 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1589 DWC3_DEVTEN_EVNTOVERFLOWEN |
1590 DWC3_DEVTEN_CMDCMPLTEN |
1591 DWC3_DEVTEN_ERRTICERREN |
1592 DWC3_DEVTEN_WKUPEVTEN |
1593 DWC3_DEVTEN_ULSTCNGEN |
1594 DWC3_DEVTEN_CONNECTDONEEN |
1595 DWC3_DEVTEN_USBRSTEN |
1596 DWC3_DEVTEN_DISCONNEVTEN);
1597
1598 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1599 }
1600
1601 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1602 {
1603 /* mask all interrupts */
1604 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1605 }
1606
1607 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1608 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1609
1610 static int dwc3_gadget_start(struct usb_gadget *g,
1611 struct usb_gadget_driver *driver)
1612 {
1613 struct dwc3 *dwc = gadget_to_dwc(g);
1614 struct dwc3_ep *dep;
1615 unsigned long flags;
1616 int ret = 0;
1617 int irq;
1618 u32 reg;
1619
1620 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1621 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1622 IRQF_SHARED, "dwc3", dwc);
1623 if (ret) {
1624 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1625 irq, ret);
1626 goto err0;
1627 }
1628
1629 spin_lock_irqsave(&dwc->lock, flags);
1630
1631 if (dwc->gadget_driver) {
1632 dev_err(dwc->dev, "%s is already bound to %s\n",
1633 dwc->gadget.name,
1634 dwc->gadget_driver->driver.name);
1635 ret = -EBUSY;
1636 goto err1;
1637 }
1638
1639 dwc->gadget_driver = driver;
1640
1641 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1642 reg &= ~(DWC3_DCFG_SPEED_MASK);
1643
1644 /**
1645 * WORKAROUND: DWC3 revision < 2.20a have an issue
1646 * which would cause metastability state on Run/Stop
1647 * bit if we try to force the IP to USB2-only mode.
1648 *
1649 * Because of that, we cannot configure the IP to any
1650 * speed other than the SuperSpeed
1651 *
1652 * Refers to:
1653 *
1654 * STAR#9000525659: Clock Domain Crossing on DCTL in
1655 * USB 2.0 Mode
1656 */
1657 if (dwc->revision < DWC3_REVISION_220A) {
1658 reg |= DWC3_DCFG_SUPERSPEED;
1659 } else {
1660 switch (dwc->maximum_speed) {
1661 case USB_SPEED_LOW:
1662 reg |= DWC3_DSTS_LOWSPEED;
1663 break;
1664 case USB_SPEED_FULL:
1665 reg |= DWC3_DSTS_FULLSPEED1;
1666 break;
1667 case USB_SPEED_HIGH:
1668 reg |= DWC3_DSTS_HIGHSPEED;
1669 break;
1670 case USB_SPEED_SUPER_PLUS:
1671 reg |= DWC3_DSTS_SUPERSPEED_PLUS;
1672 break;
1673 default:
1674 dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n",
1675 dwc->maximum_speed);
1676 /* fall through */
1677 case USB_SPEED_SUPER:
1678 reg |= DWC3_DCFG_SUPERSPEED;
1679 break;
1680 }
1681 }
1682 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1683
1684 /* Start with SuperSpeed Default */
1685 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1686
1687 dep = dwc->eps[0];
1688 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1689 false);
1690 if (ret) {
1691 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1692 goto err2;
1693 }
1694
1695 dep = dwc->eps[1];
1696 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1697 false);
1698 if (ret) {
1699 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1700 goto err3;
1701 }
1702
1703 /* begin to receive SETUP packets */
1704 dwc->ep0state = EP0_SETUP_PHASE;
1705 dwc3_ep0_out_start(dwc);
1706
1707 dwc3_gadget_enable_irq(dwc);
1708
1709 spin_unlock_irqrestore(&dwc->lock, flags);
1710
1711 return 0;
1712
1713 err3:
1714 __dwc3_gadget_ep_disable(dwc->eps[0]);
1715
1716 err2:
1717 dwc->gadget_driver = NULL;
1718
1719 err1:
1720 spin_unlock_irqrestore(&dwc->lock, flags);
1721
1722 free_irq(irq, dwc);
1723
1724 err0:
1725 return ret;
1726 }
1727
1728 static int dwc3_gadget_stop(struct usb_gadget *g)
1729 {
1730 struct dwc3 *dwc = gadget_to_dwc(g);
1731 unsigned long flags;
1732 int irq;
1733
1734 spin_lock_irqsave(&dwc->lock, flags);
1735
1736 dwc3_gadget_disable_irq(dwc);
1737 __dwc3_gadget_ep_disable(dwc->eps[0]);
1738 __dwc3_gadget_ep_disable(dwc->eps[1]);
1739
1740 dwc->gadget_driver = NULL;
1741
1742 spin_unlock_irqrestore(&dwc->lock, flags);
1743
1744 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1745 free_irq(irq, dwc);
1746
1747 return 0;
1748 }
1749
1750 static const struct usb_gadget_ops dwc3_gadget_ops = {
1751 .get_frame = dwc3_gadget_get_frame,
1752 .wakeup = dwc3_gadget_wakeup,
1753 .set_selfpowered = dwc3_gadget_set_selfpowered,
1754 .pullup = dwc3_gadget_pullup,
1755 .udc_start = dwc3_gadget_start,
1756 .udc_stop = dwc3_gadget_stop,
1757 };
1758
1759 /* -------------------------------------------------------------------------- */
1760
1761 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1762 u8 num, u32 direction)
1763 {
1764 struct dwc3_ep *dep;
1765 u8 i;
1766
1767 for (i = 0; i < num; i++) {
1768 u8 epnum = (i << 1) | (!!direction);
1769
1770 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1771 if (!dep)
1772 return -ENOMEM;
1773
1774 dep->dwc = dwc;
1775 dep->number = epnum;
1776 dep->direction = !!direction;
1777 dwc->eps[epnum] = dep;
1778
1779 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1780 (epnum & 1) ? "in" : "out");
1781
1782 dep->endpoint.name = dep->name;
1783
1784 dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name);
1785
1786 if (epnum == 0 || epnum == 1) {
1787 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1788 dep->endpoint.maxburst = 1;
1789 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1790 if (!epnum)
1791 dwc->gadget.ep0 = &dep->endpoint;
1792 } else {
1793 int ret;
1794
1795 usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1796 dep->endpoint.max_streams = 15;
1797 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1798 list_add_tail(&dep->endpoint.ep_list,
1799 &dwc->gadget.ep_list);
1800
1801 ret = dwc3_alloc_trb_pool(dep);
1802 if (ret)
1803 return ret;
1804 }
1805
1806 if (epnum == 0 || epnum == 1) {
1807 dep->endpoint.caps.type_control = true;
1808 } else {
1809 dep->endpoint.caps.type_iso = true;
1810 dep->endpoint.caps.type_bulk = true;
1811 dep->endpoint.caps.type_int = true;
1812 }
1813
1814 dep->endpoint.caps.dir_in = !!direction;
1815 dep->endpoint.caps.dir_out = !direction;
1816
1817 INIT_LIST_HEAD(&dep->request_list);
1818 INIT_LIST_HEAD(&dep->req_queued);
1819 }
1820
1821 return 0;
1822 }
1823
1824 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1825 {
1826 int ret;
1827
1828 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1829
1830 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1831 if (ret < 0) {
1832 dwc3_trace(trace_dwc3_gadget,
1833 "failed to allocate OUT endpoints");
1834 return ret;
1835 }
1836
1837 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1838 if (ret < 0) {
1839 dwc3_trace(trace_dwc3_gadget,
1840 "failed to allocate IN endpoints");
1841 return ret;
1842 }
1843
1844 return 0;
1845 }
1846
1847 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1848 {
1849 struct dwc3_ep *dep;
1850 u8 epnum;
1851
1852 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1853 dep = dwc->eps[epnum];
1854 if (!dep)
1855 continue;
1856 /*
1857 * Physical endpoints 0 and 1 are special; they form the
1858 * bi-directional USB endpoint 0.
1859 *
1860 * For those two physical endpoints, we don't allocate a TRB
1861 * pool nor do we add them the endpoints list. Due to that, we
1862 * shouldn't do these two operations otherwise we would end up
1863 * with all sorts of bugs when removing dwc3.ko.
1864 */
1865 if (epnum != 0 && epnum != 1) {
1866 dwc3_free_trb_pool(dep);
1867 list_del(&dep->endpoint.ep_list);
1868 }
1869
1870 kfree(dep);
1871 }
1872 }
1873
1874 /* -------------------------------------------------------------------------- */
1875
1876 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1877 struct dwc3_request *req, struct dwc3_trb *trb,
1878 const struct dwc3_event_depevt *event, int status)
1879 {
1880 unsigned int count;
1881 unsigned int s_pkt = 0;
1882 unsigned int trb_status;
1883
1884 trace_dwc3_complete_trb(dep, trb);
1885
1886 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1887 /*
1888 * We continue despite the error. There is not much we
1889 * can do. If we don't clean it up we loop forever. If
1890 * we skip the TRB then it gets overwritten after a
1891 * while since we use them in a ring buffer. A BUG()
1892 * would help. Lets hope that if this occurs, someone
1893 * fixes the root cause instead of looking away :)
1894 */
1895 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1896 dep->name, trb);
1897 count = trb->size & DWC3_TRB_SIZE_MASK;
1898
1899 if (dep->direction) {
1900 if (count) {
1901 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1902 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1903 dwc3_trace(trace_dwc3_gadget,
1904 "%s: incomplete IN transfer\n",
1905 dep->name);
1906 /*
1907 * If missed isoc occurred and there is
1908 * no request queued then issue END
1909 * TRANSFER, so that core generates
1910 * next xfernotready and we will issue
1911 * a fresh START TRANSFER.
1912 * If there are still queued request
1913 * then wait, do not issue either END
1914 * or UPDATE TRANSFER, just attach next
1915 * request in request_list during
1916 * giveback.If any future queued request
1917 * is successfully transferred then we
1918 * will issue UPDATE TRANSFER for all
1919 * request in the request_list.
1920 */
1921 dep->flags |= DWC3_EP_MISSED_ISOC;
1922 } else {
1923 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1924 dep->name);
1925 status = -ECONNRESET;
1926 }
1927 } else {
1928 dep->flags &= ~DWC3_EP_MISSED_ISOC;
1929 }
1930 } else {
1931 if (count && (event->status & DEPEVT_STATUS_SHORT))
1932 s_pkt = 1;
1933 }
1934
1935 /*
1936 * We assume here we will always receive the entire data block
1937 * which we should receive. Meaning, if we program RX to
1938 * receive 4K but we receive only 2K, we assume that's all we
1939 * should receive and we simply bounce the request back to the
1940 * gadget driver for further processing.
1941 */
1942 req->request.actual += req->request.length - count;
1943 if (s_pkt)
1944 return 1;
1945 if ((event->status & DEPEVT_STATUS_LST) &&
1946 (trb->ctrl & (DWC3_TRB_CTRL_LST |
1947 DWC3_TRB_CTRL_HWO)))
1948 return 1;
1949 if ((event->status & DEPEVT_STATUS_IOC) &&
1950 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1951 return 1;
1952 return 0;
1953 }
1954
1955 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1956 const struct dwc3_event_depevt *event, int status)
1957 {
1958 struct dwc3_request *req;
1959 struct dwc3_trb *trb;
1960 unsigned int slot;
1961 unsigned int i;
1962 int ret;
1963
1964 do {
1965 req = next_request(&dep->req_queued);
1966 if (WARN_ON_ONCE(!req))
1967 return 1;
1968
1969 i = 0;
1970 do {
1971 slot = req->start_slot + i;
1972 if ((slot == DWC3_TRB_NUM - 1) &&
1973 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1974 slot++;
1975 slot %= DWC3_TRB_NUM;
1976 trb = &dep->trb_pool[slot];
1977
1978 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1979 event, status);
1980 if (ret)
1981 break;
1982 } while (++i < req->request.num_mapped_sgs);
1983
1984 dwc3_gadget_giveback(dep, req, status);
1985
1986 if (ret)
1987 break;
1988 } while (1);
1989
1990 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1991 list_empty(&dep->req_queued)) {
1992 if (list_empty(&dep->request_list)) {
1993 /*
1994 * If there is no entry in request list then do
1995 * not issue END TRANSFER now. Just set PENDING
1996 * flag, so that END TRANSFER is issued when an
1997 * entry is added into request list.
1998 */
1999 dep->flags = DWC3_EP_PENDING_REQUEST;
2000 } else {
2001 dwc3_stop_active_transfer(dwc, dep->number, true);
2002 dep->flags = DWC3_EP_ENABLED;
2003 }
2004 return 1;
2005 }
2006
2007 return 1;
2008 }
2009
2010 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
2011 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
2012 {
2013 unsigned status = 0;
2014 int clean_busy;
2015 u32 is_xfer_complete;
2016
2017 is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
2018
2019 if (event->status & DEPEVT_STATUS_BUSERR)
2020 status = -ECONNRESET;
2021
2022 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
2023 if (clean_busy && (is_xfer_complete ||
2024 usb_endpoint_xfer_isoc(dep->endpoint.desc)))
2025 dep->flags &= ~DWC3_EP_BUSY;
2026
2027 /*
2028 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2029 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2030 */
2031 if (dwc->revision < DWC3_REVISION_183A) {
2032 u32 reg;
2033 int i;
2034
2035 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
2036 dep = dwc->eps[i];
2037
2038 if (!(dep->flags & DWC3_EP_ENABLED))
2039 continue;
2040
2041 if (!list_empty(&dep->req_queued))
2042 return;
2043 }
2044
2045 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2046 reg |= dwc->u1u2;
2047 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2048
2049 dwc->u1u2 = 0;
2050 }
2051
2052 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2053 int ret;
2054
2055 ret = __dwc3_gadget_kick_transfer(dep, 0, is_xfer_complete);
2056 if (!ret || ret == -EBUSY)
2057 return;
2058 }
2059 }
2060
2061 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2062 const struct dwc3_event_depevt *event)
2063 {
2064 struct dwc3_ep *dep;
2065 u8 epnum = event->endpoint_number;
2066
2067 dep = dwc->eps[epnum];
2068
2069 if (!(dep->flags & DWC3_EP_ENABLED))
2070 return;
2071
2072 if (epnum == 0 || epnum == 1) {
2073 dwc3_ep0_interrupt(dwc, event);
2074 return;
2075 }
2076
2077 switch (event->endpoint_event) {
2078 case DWC3_DEPEVT_XFERCOMPLETE:
2079 dep->resource_index = 0;
2080
2081 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2082 dwc3_trace(trace_dwc3_gadget,
2083 "%s is an Isochronous endpoint\n",
2084 dep->name);
2085 return;
2086 }
2087
2088 dwc3_endpoint_transfer_complete(dwc, dep, event);
2089 break;
2090 case DWC3_DEPEVT_XFERINPROGRESS:
2091 dwc3_endpoint_transfer_complete(dwc, dep, event);
2092 break;
2093 case DWC3_DEPEVT_XFERNOTREADY:
2094 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2095 dwc3_gadget_start_isoc(dwc, dep, event);
2096 } else {
2097 int active;
2098 int ret;
2099
2100 active = event->status & DEPEVT_STATUS_TRANSFER_ACTIVE;
2101
2102 dwc3_trace(trace_dwc3_gadget, "%s: reason %s",
2103 dep->name, active ? "Transfer Active"
2104 : "Transfer Not Active");
2105
2106 ret = __dwc3_gadget_kick_transfer(dep, 0, !active);
2107 if (!ret || ret == -EBUSY)
2108 return;
2109
2110 dwc3_trace(trace_dwc3_gadget,
2111 "%s: failed to kick transfers\n",
2112 dep->name);
2113 }
2114
2115 break;
2116 case DWC3_DEPEVT_STREAMEVT:
2117 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
2118 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2119 dep->name);
2120 return;
2121 }
2122
2123 switch (event->status) {
2124 case DEPEVT_STREAMEVT_FOUND:
2125 dwc3_trace(trace_dwc3_gadget,
2126 "Stream %d found and started",
2127 event->parameters);
2128
2129 break;
2130 case DEPEVT_STREAMEVT_NOTFOUND:
2131 /* FALLTHROUGH */
2132 default:
2133 dwc3_trace(trace_dwc3_gadget,
2134 "unable to find suitable stream\n");
2135 }
2136 break;
2137 case DWC3_DEPEVT_RXTXFIFOEVT:
2138 dwc3_trace(trace_dwc3_gadget, "%s FIFO Overrun\n", dep->name);
2139 break;
2140 case DWC3_DEPEVT_EPCMDCMPLT:
2141 dwc3_trace(trace_dwc3_gadget, "Endpoint Command Complete");
2142 break;
2143 }
2144 }
2145
2146 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2147 {
2148 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2149 spin_unlock(&dwc->lock);
2150 dwc->gadget_driver->disconnect(&dwc->gadget);
2151 spin_lock(&dwc->lock);
2152 }
2153 }
2154
2155 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2156 {
2157 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2158 spin_unlock(&dwc->lock);
2159 dwc->gadget_driver->suspend(&dwc->gadget);
2160 spin_lock(&dwc->lock);
2161 }
2162 }
2163
2164 static void dwc3_resume_gadget(struct dwc3 *dwc)
2165 {
2166 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2167 spin_unlock(&dwc->lock);
2168 dwc->gadget_driver->resume(&dwc->gadget);
2169 spin_lock(&dwc->lock);
2170 }
2171 }
2172
2173 static void dwc3_reset_gadget(struct dwc3 *dwc)
2174 {
2175 if (!dwc->gadget_driver)
2176 return;
2177
2178 if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2179 spin_unlock(&dwc->lock);
2180 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2181 spin_lock(&dwc->lock);
2182 }
2183 }
2184
2185 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2186 {
2187 struct dwc3_ep *dep;
2188 struct dwc3_gadget_ep_cmd_params params;
2189 u32 cmd;
2190 int ret;
2191
2192 dep = dwc->eps[epnum];
2193
2194 if (!dep->resource_index)
2195 return;
2196
2197 /*
2198 * NOTICE: We are violating what the Databook says about the
2199 * EndTransfer command. Ideally we would _always_ wait for the
2200 * EndTransfer Command Completion IRQ, but that's causing too
2201 * much trouble synchronizing between us and gadget driver.
2202 *
2203 * We have discussed this with the IP Provider and it was
2204 * suggested to giveback all requests here, but give HW some
2205 * extra time to synchronize with the interconnect. We're using
2206 * an arbitrary 100us delay for that.
2207 *
2208 * Note also that a similar handling was tested by Synopsys
2209 * (thanks a lot Paul) and nothing bad has come out of it.
2210 * In short, what we're doing is:
2211 *
2212 * - Issue EndTransfer WITH CMDIOC bit set
2213 * - Wait 100us
2214 */
2215
2216 cmd = DWC3_DEPCMD_ENDTRANSFER;
2217 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2218 cmd |= DWC3_DEPCMD_CMDIOC;
2219 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2220 memset(&params, 0, sizeof(params));
2221 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
2222 WARN_ON_ONCE(ret);
2223 dep->resource_index = 0;
2224 dep->flags &= ~DWC3_EP_BUSY;
2225 udelay(100);
2226 }
2227
2228 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2229 {
2230 u32 epnum;
2231
2232 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2233 struct dwc3_ep *dep;
2234
2235 dep = dwc->eps[epnum];
2236 if (!dep)
2237 continue;
2238
2239 if (!(dep->flags & DWC3_EP_ENABLED))
2240 continue;
2241
2242 dwc3_remove_requests(dwc, dep);
2243 }
2244 }
2245
2246 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2247 {
2248 u32 epnum;
2249
2250 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2251 struct dwc3_ep *dep;
2252 struct dwc3_gadget_ep_cmd_params params;
2253 int ret;
2254
2255 dep = dwc->eps[epnum];
2256 if (!dep)
2257 continue;
2258
2259 if (!(dep->flags & DWC3_EP_STALL))
2260 continue;
2261
2262 dep->flags &= ~DWC3_EP_STALL;
2263
2264 memset(&params, 0, sizeof(params));
2265 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2266 DWC3_DEPCMD_CLEARSTALL, &params);
2267 WARN_ON_ONCE(ret);
2268 }
2269 }
2270
2271 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2272 {
2273 int reg;
2274
2275 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2276 reg &= ~DWC3_DCTL_INITU1ENA;
2277 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2278
2279 reg &= ~DWC3_DCTL_INITU2ENA;
2280 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2281
2282 dwc3_disconnect_gadget(dwc);
2283
2284 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2285 dwc->setup_packet_pending = false;
2286 usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2287 }
2288
2289 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2290 {
2291 u32 reg;
2292
2293 /*
2294 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2295 * would cause a missing Disconnect Event if there's a
2296 * pending Setup Packet in the FIFO.
2297 *
2298 * There's no suggested workaround on the official Bug
2299 * report, which states that "unless the driver/application
2300 * is doing any special handling of a disconnect event,
2301 * there is no functional issue".
2302 *
2303 * Unfortunately, it turns out that we _do_ some special
2304 * handling of a disconnect event, namely complete all
2305 * pending transfers, notify gadget driver of the
2306 * disconnection, and so on.
2307 *
2308 * Our suggested workaround is to follow the Disconnect
2309 * Event steps here, instead, based on a setup_packet_pending
2310 * flag. Such flag gets set whenever we have a SETUP_PENDING
2311 * status for EP0 TRBs and gets cleared on XferComplete for the
2312 * same endpoint.
2313 *
2314 * Refers to:
2315 *
2316 * STAR#9000466709: RTL: Device : Disconnect event not
2317 * generated if setup packet pending in FIFO
2318 */
2319 if (dwc->revision < DWC3_REVISION_188A) {
2320 if (dwc->setup_packet_pending)
2321 dwc3_gadget_disconnect_interrupt(dwc);
2322 }
2323
2324 dwc3_reset_gadget(dwc);
2325
2326 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2327 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2328 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2329 dwc->test_mode = false;
2330
2331 dwc3_stop_active_transfers(dwc);
2332 dwc3_clear_stall_all_ep(dwc);
2333
2334 /* Reset device address to zero */
2335 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2336 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2337 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2338 }
2339
2340 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2341 {
2342 u32 reg;
2343 u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2344
2345 /*
2346 * We change the clock only at SS but I dunno why I would want to do
2347 * this. Maybe it becomes part of the power saving plan.
2348 */
2349
2350 if ((speed != DWC3_DSTS_SUPERSPEED) &&
2351 (speed != DWC3_DSTS_SUPERSPEED_PLUS))
2352 return;
2353
2354 /*
2355 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2356 * each time on Connect Done.
2357 */
2358 if (!usb30_clock)
2359 return;
2360
2361 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2362 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2363 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2364 }
2365
2366 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2367 {
2368 struct dwc3_ep *dep;
2369 int ret;
2370 u32 reg;
2371 u8 speed;
2372
2373 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2374 speed = reg & DWC3_DSTS_CONNECTSPD;
2375 dwc->speed = speed;
2376
2377 dwc3_update_ram_clk_sel(dwc, speed);
2378
2379 switch (speed) {
2380 case DWC3_DCFG_SUPERSPEED_PLUS:
2381 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2382 dwc->gadget.ep0->maxpacket = 512;
2383 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2384 break;
2385 case DWC3_DCFG_SUPERSPEED:
2386 /*
2387 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2388 * would cause a missing USB3 Reset event.
2389 *
2390 * In such situations, we should force a USB3 Reset
2391 * event by calling our dwc3_gadget_reset_interrupt()
2392 * routine.
2393 *
2394 * Refers to:
2395 *
2396 * STAR#9000483510: RTL: SS : USB3 reset event may
2397 * not be generated always when the link enters poll
2398 */
2399 if (dwc->revision < DWC3_REVISION_190A)
2400 dwc3_gadget_reset_interrupt(dwc);
2401
2402 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2403 dwc->gadget.ep0->maxpacket = 512;
2404 dwc->gadget.speed = USB_SPEED_SUPER;
2405 break;
2406 case DWC3_DCFG_HIGHSPEED:
2407 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2408 dwc->gadget.ep0->maxpacket = 64;
2409 dwc->gadget.speed = USB_SPEED_HIGH;
2410 break;
2411 case DWC3_DCFG_FULLSPEED2:
2412 case DWC3_DCFG_FULLSPEED1:
2413 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2414 dwc->gadget.ep0->maxpacket = 64;
2415 dwc->gadget.speed = USB_SPEED_FULL;
2416 break;
2417 case DWC3_DCFG_LOWSPEED:
2418 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2419 dwc->gadget.ep0->maxpacket = 8;
2420 dwc->gadget.speed = USB_SPEED_LOW;
2421 break;
2422 }
2423
2424 /* Enable USB2 LPM Capability */
2425
2426 if ((dwc->revision > DWC3_REVISION_194A) &&
2427 (speed != DWC3_DCFG_SUPERSPEED) &&
2428 (speed != DWC3_DCFG_SUPERSPEED_PLUS)) {
2429 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2430 reg |= DWC3_DCFG_LPM_CAP;
2431 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2432
2433 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2434 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2435
2436 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2437
2438 /*
2439 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2440 * DCFG.LPMCap is set, core responses with an ACK and the
2441 * BESL value in the LPM token is less than or equal to LPM
2442 * NYET threshold.
2443 */
2444 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2445 && dwc->has_lpm_erratum,
2446 "LPM Erratum not available on dwc3 revisisions < 2.40a\n");
2447
2448 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2449 reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2450
2451 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2452 } else {
2453 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2454 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2455 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2456 }
2457
2458 dep = dwc->eps[0];
2459 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2460 false);
2461 if (ret) {
2462 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2463 return;
2464 }
2465
2466 dep = dwc->eps[1];
2467 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2468 false);
2469 if (ret) {
2470 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2471 return;
2472 }
2473
2474 /*
2475 * Configure PHY via GUSB3PIPECTLn if required.
2476 *
2477 * Update GTXFIFOSIZn
2478 *
2479 * In both cases reset values should be sufficient.
2480 */
2481 }
2482
2483 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2484 {
2485 /*
2486 * TODO take core out of low power mode when that's
2487 * implemented.
2488 */
2489
2490 dwc->gadget_driver->resume(&dwc->gadget);
2491 }
2492
2493 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2494 unsigned int evtinfo)
2495 {
2496 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2497 unsigned int pwropt;
2498
2499 /*
2500 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2501 * Hibernation mode enabled which would show up when device detects
2502 * host-initiated U3 exit.
2503 *
2504 * In that case, device will generate a Link State Change Interrupt
2505 * from U3 to RESUME which is only necessary if Hibernation is
2506 * configured in.
2507 *
2508 * There are no functional changes due to such spurious event and we
2509 * just need to ignore it.
2510 *
2511 * Refers to:
2512 *
2513 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2514 * operational mode
2515 */
2516 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2517 if ((dwc->revision < DWC3_REVISION_250A) &&
2518 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2519 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2520 (next == DWC3_LINK_STATE_RESUME)) {
2521 dwc3_trace(trace_dwc3_gadget,
2522 "ignoring transition U3 -> Resume");
2523 return;
2524 }
2525 }
2526
2527 /*
2528 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2529 * on the link partner, the USB session might do multiple entry/exit
2530 * of low power states before a transfer takes place.
2531 *
2532 * Due to this problem, we might experience lower throughput. The
2533 * suggested workaround is to disable DCTL[12:9] bits if we're
2534 * transitioning from U1/U2 to U0 and enable those bits again
2535 * after a transfer completes and there are no pending transfers
2536 * on any of the enabled endpoints.
2537 *
2538 * This is the first half of that workaround.
2539 *
2540 * Refers to:
2541 *
2542 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2543 * core send LGO_Ux entering U0
2544 */
2545 if (dwc->revision < DWC3_REVISION_183A) {
2546 if (next == DWC3_LINK_STATE_U0) {
2547 u32 u1u2;
2548 u32 reg;
2549
2550 switch (dwc->link_state) {
2551 case DWC3_LINK_STATE_U1:
2552 case DWC3_LINK_STATE_U2:
2553 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2554 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2555 | DWC3_DCTL_ACCEPTU2ENA
2556 | DWC3_DCTL_INITU1ENA
2557 | DWC3_DCTL_ACCEPTU1ENA);
2558
2559 if (!dwc->u1u2)
2560 dwc->u1u2 = reg & u1u2;
2561
2562 reg &= ~u1u2;
2563
2564 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2565 break;
2566 default:
2567 /* do nothing */
2568 break;
2569 }
2570 }
2571 }
2572
2573 switch (next) {
2574 case DWC3_LINK_STATE_U1:
2575 if (dwc->speed == USB_SPEED_SUPER)
2576 dwc3_suspend_gadget(dwc);
2577 break;
2578 case DWC3_LINK_STATE_U2:
2579 case DWC3_LINK_STATE_U3:
2580 dwc3_suspend_gadget(dwc);
2581 break;
2582 case DWC3_LINK_STATE_RESUME:
2583 dwc3_resume_gadget(dwc);
2584 break;
2585 default:
2586 /* do nothing */
2587 break;
2588 }
2589
2590 dwc->link_state = next;
2591 }
2592
2593 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2594 unsigned int evtinfo)
2595 {
2596 unsigned int is_ss = evtinfo & BIT(4);
2597
2598 /**
2599 * WORKAROUND: DWC3 revison 2.20a with hibernation support
2600 * have a known issue which can cause USB CV TD.9.23 to fail
2601 * randomly.
2602 *
2603 * Because of this issue, core could generate bogus hibernation
2604 * events which SW needs to ignore.
2605 *
2606 * Refers to:
2607 *
2608 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2609 * Device Fallback from SuperSpeed
2610 */
2611 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2612 return;
2613
2614 /* enter hibernation here */
2615 }
2616
2617 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2618 const struct dwc3_event_devt *event)
2619 {
2620 switch (event->type) {
2621 case DWC3_DEVICE_EVENT_DISCONNECT:
2622 dwc3_gadget_disconnect_interrupt(dwc);
2623 break;
2624 case DWC3_DEVICE_EVENT_RESET:
2625 dwc3_gadget_reset_interrupt(dwc);
2626 break;
2627 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2628 dwc3_gadget_conndone_interrupt(dwc);
2629 break;
2630 case DWC3_DEVICE_EVENT_WAKEUP:
2631 dwc3_gadget_wakeup_interrupt(dwc);
2632 break;
2633 case DWC3_DEVICE_EVENT_HIBER_REQ:
2634 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2635 "unexpected hibernation event\n"))
2636 break;
2637
2638 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2639 break;
2640 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2641 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2642 break;
2643 case DWC3_DEVICE_EVENT_EOPF:
2644 dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
2645 break;
2646 case DWC3_DEVICE_EVENT_SOF:
2647 dwc3_trace(trace_dwc3_gadget, "Start of Periodic Frame");
2648 break;
2649 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2650 dwc3_trace(trace_dwc3_gadget, "Erratic Error");
2651 break;
2652 case DWC3_DEVICE_EVENT_CMD_CMPL:
2653 dwc3_trace(trace_dwc3_gadget, "Command Complete");
2654 break;
2655 case DWC3_DEVICE_EVENT_OVERFLOW:
2656 dwc3_trace(trace_dwc3_gadget, "Overflow");
2657 break;
2658 default:
2659 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2660 }
2661 }
2662
2663 static void dwc3_process_event_entry(struct dwc3 *dwc,
2664 const union dwc3_event *event)
2665 {
2666 trace_dwc3_event(event->raw);
2667
2668 /* Endpoint IRQ, handle it and return early */
2669 if (event->type.is_devspec == 0) {
2670 /* depevt */
2671 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2672 }
2673
2674 switch (event->type.type) {
2675 case DWC3_EVENT_TYPE_DEV:
2676 dwc3_gadget_interrupt(dwc, &event->devt);
2677 break;
2678 /* REVISIT what to do with Carkit and I2C events ? */
2679 default:
2680 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2681 }
2682 }
2683
2684 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2685 {
2686 struct dwc3_event_buffer *evt;
2687 irqreturn_t ret = IRQ_NONE;
2688 int left;
2689 u32 reg;
2690
2691 evt = dwc->ev_buffs[buf];
2692 left = evt->count;
2693
2694 if (!(evt->flags & DWC3_EVENT_PENDING))
2695 return IRQ_NONE;
2696
2697 while (left > 0) {
2698 union dwc3_event event;
2699
2700 event.raw = *(u32 *) (evt->buf + evt->lpos);
2701
2702 dwc3_process_event_entry(dwc, &event);
2703
2704 /*
2705 * FIXME we wrap around correctly to the next entry as
2706 * almost all entries are 4 bytes in size. There is one
2707 * entry which has 12 bytes which is a regular entry
2708 * followed by 8 bytes data. ATM I don't know how
2709 * things are organized if we get next to the a
2710 * boundary so I worry about that once we try to handle
2711 * that.
2712 */
2713 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2714 left -= 4;
2715
2716 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2717 }
2718
2719 evt->count = 0;
2720 evt->flags &= ~DWC3_EVENT_PENDING;
2721 ret = IRQ_HANDLED;
2722
2723 /* Unmask interrupt */
2724 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2725 reg &= ~DWC3_GEVNTSIZ_INTMASK;
2726 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2727
2728 return ret;
2729 }
2730
2731 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2732 {
2733 struct dwc3 *dwc = _dwc;
2734 unsigned long flags;
2735 irqreturn_t ret = IRQ_NONE;
2736 int i;
2737
2738 spin_lock_irqsave(&dwc->lock, flags);
2739
2740 for (i = 0; i < dwc->num_event_buffers; i++)
2741 ret |= dwc3_process_event_buf(dwc, i);
2742
2743 spin_unlock_irqrestore(&dwc->lock, flags);
2744
2745 return ret;
2746 }
2747
2748 static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2749 {
2750 struct dwc3_event_buffer *evt;
2751 u32 count;
2752 u32 reg;
2753
2754 evt = dwc->ev_buffs[buf];
2755
2756 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2757 count &= DWC3_GEVNTCOUNT_MASK;
2758 if (!count)
2759 return IRQ_NONE;
2760
2761 evt->count = count;
2762 evt->flags |= DWC3_EVENT_PENDING;
2763
2764 /* Mask interrupt */
2765 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2766 reg |= DWC3_GEVNTSIZ_INTMASK;
2767 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2768
2769 return IRQ_WAKE_THREAD;
2770 }
2771
2772 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2773 {
2774 struct dwc3 *dwc = _dwc;
2775 int i;
2776 irqreturn_t ret = IRQ_NONE;
2777
2778 for (i = 0; i < dwc->num_event_buffers; i++) {
2779 irqreturn_t status;
2780
2781 status = dwc3_check_event_buf(dwc, i);
2782 if (status == IRQ_WAKE_THREAD)
2783 ret = status;
2784 }
2785
2786 return ret;
2787 }
2788
2789 /**
2790 * dwc3_gadget_init - Initializes gadget related registers
2791 * @dwc: pointer to our controller context structure
2792 *
2793 * Returns 0 on success otherwise negative errno.
2794 */
2795 int dwc3_gadget_init(struct dwc3 *dwc)
2796 {
2797 int ret;
2798
2799 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2800 &dwc->ctrl_req_addr, GFP_KERNEL);
2801 if (!dwc->ctrl_req) {
2802 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2803 ret = -ENOMEM;
2804 goto err0;
2805 }
2806
2807 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
2808 &dwc->ep0_trb_addr, GFP_KERNEL);
2809 if (!dwc->ep0_trb) {
2810 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2811 ret = -ENOMEM;
2812 goto err1;
2813 }
2814
2815 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2816 if (!dwc->setup_buf) {
2817 ret = -ENOMEM;
2818 goto err2;
2819 }
2820
2821 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2822 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2823 GFP_KERNEL);
2824 if (!dwc->ep0_bounce) {
2825 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2826 ret = -ENOMEM;
2827 goto err3;
2828 }
2829
2830 dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);
2831 if (!dwc->zlp_buf) {
2832 ret = -ENOMEM;
2833 goto err4;
2834 }
2835
2836 dwc->gadget.ops = &dwc3_gadget_ops;
2837 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2838 dwc->gadget.sg_supported = true;
2839 dwc->gadget.name = "dwc3-gadget";
2840 dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG;
2841
2842 /*
2843 * FIXME We might be setting max_speed to <SUPER, however versions
2844 * <2.20a of dwc3 have an issue with metastability (documented
2845 * elsewhere in this driver) which tells us we can't set max speed to
2846 * anything lower than SUPER.
2847 *
2848 * Because gadget.max_speed is only used by composite.c and function
2849 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
2850 * to happen so we avoid sending SuperSpeed Capability descriptor
2851 * together with our BOS descriptor as that could confuse host into
2852 * thinking we can handle super speed.
2853 *
2854 * Note that, in fact, we won't even support GetBOS requests when speed
2855 * is less than super speed because we don't have means, yet, to tell
2856 * composite.c that we are USB 2.0 + LPM ECN.
2857 */
2858 if (dwc->revision < DWC3_REVISION_220A)
2859 dwc3_trace(trace_dwc3_gadget,
2860 "Changing max_speed on rev %08x\n",
2861 dwc->revision);
2862
2863 dwc->gadget.max_speed = dwc->maximum_speed;
2864
2865 /*
2866 * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2867 * on ep out.
2868 */
2869 dwc->gadget.quirk_ep_out_aligned_size = true;
2870
2871 /*
2872 * REVISIT: Here we should clear all pending IRQs to be
2873 * sure we're starting from a well known location.
2874 */
2875
2876 ret = dwc3_gadget_init_endpoints(dwc);
2877 if (ret)
2878 goto err5;
2879
2880 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2881 if (ret) {
2882 dev_err(dwc->dev, "failed to register udc\n");
2883 goto err5;
2884 }
2885
2886 return 0;
2887
2888 err5:
2889 kfree(dwc->zlp_buf);
2890
2891 err4:
2892 dwc3_gadget_free_endpoints(dwc);
2893 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2894 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2895
2896 err3:
2897 kfree(dwc->setup_buf);
2898
2899 err2:
2900 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2901 dwc->ep0_trb, dwc->ep0_trb_addr);
2902
2903 err1:
2904 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2905 dwc->ctrl_req, dwc->ctrl_req_addr);
2906
2907 err0:
2908 return ret;
2909 }
2910
2911 /* -------------------------------------------------------------------------- */
2912
2913 void dwc3_gadget_exit(struct dwc3 *dwc)
2914 {
2915 usb_del_gadget_udc(&dwc->gadget);
2916
2917 dwc3_gadget_free_endpoints(dwc);
2918
2919 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2920 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2921
2922 kfree(dwc->setup_buf);
2923 kfree(dwc->zlp_buf);
2924
2925 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2926 dwc->ep0_trb, dwc->ep0_trb_addr);
2927
2928 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2929 dwc->ctrl_req, dwc->ctrl_req_addr);
2930 }
2931
2932 int dwc3_gadget_suspend(struct dwc3 *dwc)
2933 {
2934 if (dwc->pullups_connected) {
2935 dwc3_gadget_disable_irq(dwc);
2936 dwc3_gadget_run_stop(dwc, true, true);
2937 }
2938
2939 __dwc3_gadget_ep_disable(dwc->eps[0]);
2940 __dwc3_gadget_ep_disable(dwc->eps[1]);
2941
2942 dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2943
2944 return 0;
2945 }
2946
2947 int dwc3_gadget_resume(struct dwc3 *dwc)
2948 {
2949 struct dwc3_ep *dep;
2950 int ret;
2951
2952 /* Start with SuperSpeed Default */
2953 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2954
2955 dep = dwc->eps[0];
2956 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2957 false);
2958 if (ret)
2959 goto err0;
2960
2961 dep = dwc->eps[1];
2962 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2963 false);
2964 if (ret)
2965 goto err1;
2966
2967 /* begin to receive SETUP packets */
2968 dwc->ep0state = EP0_SETUP_PHASE;
2969 dwc3_ep0_out_start(dwc);
2970
2971 dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2972
2973 if (dwc->pullups_connected) {
2974 dwc3_gadget_enable_irq(dwc);
2975 dwc3_gadget_run_stop(dwc, true, false);
2976 }
2977
2978 return 0;
2979
2980 err1:
2981 __dwc3_gadget_ep_disable(dwc->eps[0]);
2982
2983 err0:
2984 return ret;
2985 }
Linux kernel - Deliverables
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