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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 - https://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 */
41int 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 USB_TEST_J:
50 case USB_TEST_K:
51 case USB_TEST_SE0_NAK:
52 case USB_TEST_PACKET:
53 case USB_TEST_FORCE_ENABLE:
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 */
72int 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 */
89int 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 (!DWC3_VER_IS_PRIOR(DWC3, 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 (!DWC3_VER_IS_PRIOR(DWC3, 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 */
150static 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 */
161static 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 */
170static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
171{
172 dwc3_ep_inc_trb(&dep->trb_dequeue);
173}
174
175static 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 */
208void 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 */
230int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd,
231 u32 param)
232{
233 u32 timeout = 500;
234 int status = 0;
235 int ret = 0;
236 u32 reg;
237
238 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
239 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
240
241 do {
242 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
243 if (!(reg & DWC3_DGCMD_CMDACT)) {
244 status = DWC3_DGCMD_STATUS(reg);
245 if (status)
246 ret = -EINVAL;
247 break;
248 }
249 } while (--timeout);
250
251 if (!timeout) {
252 ret = -ETIMEDOUT;
253 status = -ETIMEDOUT;
254 }
255
256 trace_dwc3_gadget_generic_cmd(cmd, param, status);
257
258 return ret;
259}
260
261static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
262
263/**
264 * dwc3_send_gadget_ep_cmd - issue an endpoint command
265 * @dep: the endpoint to which the command is going to be issued
266 * @cmd: the command to be issued
267 * @params: parameters to the command
268 *
269 * Caller should handle locking. This function will issue @cmd with given
270 * @params to @dep and wait for its completion.
271 */
272int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
273 struct dwc3_gadget_ep_cmd_params *params)
274{
275 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
276 struct dwc3 *dwc = dep->dwc;
277 u32 timeout = 5000;
278 u32 saved_config = 0;
279 u32 reg;
280
281 int cmd_status = 0;
282 int ret = -EINVAL;
283
284 /*
285 * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
286 * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an
287 * endpoint command.
288 *
289 * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY
290 * settings. Restore them after the command is completed.
291 *
292 * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2
293 */
294 if (dwc->gadget->speed <= USB_SPEED_HIGH ||
295 DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER) {
296 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
297 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
298 saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;
299 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
300 }
301
302 if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {
303 saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;
304 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
305 }
306
307 if (saved_config)
308 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
309 }
310
311 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
312 int link_state;
313
314 /*
315 * Initiate remote wakeup if the link state is in U3 when
316 * operating in SS/SSP or L1/L2 when operating in HS/FS. If the
317 * link state is in U1/U2, no remote wakeup is needed. The Start
318 * Transfer command will initiate the link recovery.
319 */
320 link_state = dwc3_gadget_get_link_state(dwc);
321 switch (link_state) {
322 case DWC3_LINK_STATE_U2:
323 if (dwc->gadget->speed >= USB_SPEED_SUPER)
324 break;
325
326 fallthrough;
327 case DWC3_LINK_STATE_U3:
328 ret = __dwc3_gadget_wakeup(dwc);
329 dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
330 ret);
331 break;
332 }
333 }
334
335 /*
336 * For some commands such as Update Transfer command, DEPCMDPARn
337 * registers are reserved. Since the driver often sends Update Transfer
338 * command, don't write to DEPCMDPARn to avoid register write delays and
339 * improve performance.
340 */
341 if (DWC3_DEPCMD_CMD(cmd) != DWC3_DEPCMD_UPDATETRANSFER) {
342 dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
343 dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
344 dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
345 }
346
347 /*
348 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
349 * not relying on XferNotReady, we can make use of a special "No
350 * Response Update Transfer" command where we should clear both CmdAct
351 * and CmdIOC bits.
352 *
353 * With this, we don't need to wait for command completion and can
354 * straight away issue further commands to the endpoint.
355 *
356 * NOTICE: We're making an assumption that control endpoints will never
357 * make use of Update Transfer command. This is a safe assumption
358 * because we can never have more than one request at a time with
359 * Control Endpoints. If anybody changes that assumption, this chunk
360 * needs to be updated accordingly.
361 */
362 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
363 !usb_endpoint_xfer_isoc(desc))
364 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
365 else
366 cmd |= DWC3_DEPCMD_CMDACT;
367
368 dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
369
370 if (!(cmd & DWC3_DEPCMD_CMDACT) ||
371 (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER &&
372 !(cmd & DWC3_DEPCMD_CMDIOC))) {
373 ret = 0;
374 goto skip_status;
375 }
376
377 do {
378 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
379 if (!(reg & DWC3_DEPCMD_CMDACT)) {
380 cmd_status = DWC3_DEPCMD_STATUS(reg);
381
382 switch (cmd_status) {
383 case 0:
384 ret = 0;
385 break;
386 case DEPEVT_TRANSFER_NO_RESOURCE:
387 dev_WARN(dwc->dev, "No resource for %s\n",
388 dep->name);
389 ret = -EINVAL;
390 break;
391 case DEPEVT_TRANSFER_BUS_EXPIRY:
392 /*
393 * SW issues START TRANSFER command to
394 * isochronous ep with future frame interval. If
395 * future interval time has already passed when
396 * core receives the command, it will respond
397 * with an error status of 'Bus Expiry'.
398 *
399 * Instead of always returning -EINVAL, let's
400 * give a hint to the gadget driver that this is
401 * the case by returning -EAGAIN.
402 */
403 ret = -EAGAIN;
404 break;
405 default:
406 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
407 }
408
409 break;
410 }
411 } while (--timeout);
412
413 if (timeout == 0) {
414 ret = -ETIMEDOUT;
415 cmd_status = -ETIMEDOUT;
416 }
417
418skip_status:
419 trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
420
421 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
422 if (ret == 0)
423 dep->flags |= DWC3_EP_TRANSFER_STARTED;
424
425 if (ret != -ETIMEDOUT)
426 dwc3_gadget_ep_get_transfer_index(dep);
427 }
428
429 if (saved_config) {
430 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
431 reg |= saved_config;
432 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
433 }
434
435 return ret;
436}
437
438static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
439{
440 struct dwc3 *dwc = dep->dwc;
441 struct dwc3_gadget_ep_cmd_params params;
442 u32 cmd = DWC3_DEPCMD_CLEARSTALL;
443
444 /*
445 * As of core revision 2.60a the recommended programming model
446 * is to set the ClearPendIN bit when issuing a Clear Stall EP
447 * command for IN endpoints. This is to prevent an issue where
448 * some (non-compliant) hosts may not send ACK TPs for pending
449 * IN transfers due to a mishandled error condition. Synopsys
450 * STAR 9000614252.
451 */
452 if (dep->direction &&
453 !DWC3_VER_IS_PRIOR(DWC3, 260A) &&
454 (dwc->gadget->speed >= USB_SPEED_SUPER))
455 cmd |= DWC3_DEPCMD_CLEARPENDIN;
456
457 memset(¶ms, 0, sizeof(params));
458
459 return dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
460}
461
462static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
463 struct dwc3_trb *trb)
464{
465 u32 offset = (char *) trb - (char *) dep->trb_pool;
466
467 return dep->trb_pool_dma + offset;
468}
469
470static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
471{
472 struct dwc3 *dwc = dep->dwc;
473
474 if (dep->trb_pool)
475 return 0;
476
477 dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
478 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
479 &dep->trb_pool_dma, GFP_KERNEL);
480 if (!dep->trb_pool) {
481 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
482 dep->name);
483 return -ENOMEM;
484 }
485
486 return 0;
487}
488
489static void dwc3_free_trb_pool(struct dwc3_ep *dep)
490{
491 struct dwc3 *dwc = dep->dwc;
492
493 dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
494 dep->trb_pool, dep->trb_pool_dma);
495
496 dep->trb_pool = NULL;
497 dep->trb_pool_dma = 0;
498}
499
500static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
501{
502 struct dwc3_gadget_ep_cmd_params params;
503
504 memset(¶ms, 0x00, sizeof(params));
505
506 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
507
508 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
509 ¶ms);
510}
511
512/**
513 * dwc3_gadget_start_config - configure ep resources
514 * @dep: endpoint that is being enabled
515 *
516 * Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's
517 * completion, it will set Transfer Resource for all available endpoints.
518 *
519 * The assignment of transfer resources cannot perfectly follow the data book
520 * due to the fact that the controller driver does not have all knowledge of the
521 * configuration in advance. It is given this information piecemeal by the
522 * composite gadget framework after every SET_CONFIGURATION and
523 * SET_INTERFACE. Trying to follow the databook programming model in this
524 * scenario can cause errors. For two reasons:
525 *
526 * 1) The databook says to do %DWC3_DEPCMD_DEPSTARTCFG for every
527 * %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is
528 * incorrect in the scenario of multiple interfaces.
529 *
530 * 2) The databook does not mention doing more %DWC3_DEPCMD_DEPXFERCFG for new
531 * endpoint on alt setting (8.1.6).
532 *
533 * The following simplified method is used instead:
534 *
535 * All hardware endpoints can be assigned a transfer resource and this setting
536 * will stay persistent until either a core reset or hibernation. So whenever we
537 * do a %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do
538 * %DWC3_DEPCMD_DEPXFERCFG for every hardware endpoint as well. We are
539 * guaranteed that there are as many transfer resources as endpoints.
540 *
541 * This function is called for each endpoint when it is being enabled but is
542 * triggered only when called for EP0-out, which always happens first, and which
543 * should only happen in one of the above conditions.
544 */
545static int dwc3_gadget_start_config(struct dwc3_ep *dep)
546{
547 struct dwc3_gadget_ep_cmd_params params;
548 struct dwc3 *dwc;
549 u32 cmd;
550 int i;
551 int ret;
552
553 if (dep->number)
554 return 0;
555
556 memset(¶ms, 0x00, sizeof(params));
557 cmd = DWC3_DEPCMD_DEPSTARTCFG;
558 dwc = dep->dwc;
559
560 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
561 if (ret)
562 return ret;
563
564 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
565 struct dwc3_ep *dep = dwc->eps[i];
566
567 if (!dep)
568 continue;
569
570 ret = dwc3_gadget_set_xfer_resource(dep);
571 if (ret)
572 return ret;
573 }
574
575 return 0;
576}
577
578static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
579{
580 const struct usb_ss_ep_comp_descriptor *comp_desc;
581 const struct usb_endpoint_descriptor *desc;
582 struct dwc3_gadget_ep_cmd_params params;
583 struct dwc3 *dwc = dep->dwc;
584
585 comp_desc = dep->endpoint.comp_desc;
586 desc = dep->endpoint.desc;
587
588 memset(¶ms, 0x00, sizeof(params));
589
590 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
591 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
592
593 /* Burst size is only needed in SuperSpeed mode */
594 if (dwc->gadget->speed >= USB_SPEED_SUPER) {
595 u32 burst = dep->endpoint.maxburst;
596
597 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
598 }
599
600 params.param0 |= action;
601 if (action == DWC3_DEPCFG_ACTION_RESTORE)
602 params.param2 |= dep->saved_state;
603
604 if (usb_endpoint_xfer_control(desc))
605 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
606
607 if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
608 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
609
610 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
611 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
612 | DWC3_DEPCFG_XFER_COMPLETE_EN
613 | DWC3_DEPCFG_STREAM_EVENT_EN;
614 dep->stream_capable = true;
615 }
616
617 if (!usb_endpoint_xfer_control(desc))
618 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
619
620 /*
621 * We are doing 1:1 mapping for endpoints, meaning
622 * Physical Endpoints 2 maps to Logical Endpoint 2 and
623 * so on. We consider the direction bit as part of the physical
624 * endpoint number. So USB endpoint 0x81 is 0x03.
625 */
626 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
627
628 /*
629 * We must use the lower 16 TX FIFOs even though
630 * HW might have more
631 */
632 if (dep->direction)
633 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
634
635 if (desc->bInterval) {
636 u8 bInterval_m1;
637
638 /*
639 * Valid range for DEPCFG.bInterval_m1 is from 0 to 13.
640 *
641 * NOTE: The programming guide incorrectly stated bInterval_m1
642 * must be set to 0 when operating in fullspeed. Internally the
643 * controller does not have this limitation. See DWC_usb3x
644 * programming guide section 3.2.2.1.
645 */
646 bInterval_m1 = min_t(u8, desc->bInterval - 1, 13);
647
648 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
649 dwc->gadget->speed == USB_SPEED_FULL)
650 dep->interval = desc->bInterval;
651 else
652 dep->interval = 1 << (desc->bInterval - 1);
653
654 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1);
655 }
656
657 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, ¶ms);
658}
659
660/**
661 * dwc3_gadget_calc_tx_fifo_size - calculates the txfifo size value
662 * @dwc: pointer to the DWC3 context
663 * @mult: multiplier to be used when calculating the fifo_size
664 *
665 * Calculates the size value based on the equation below:
666 *
667 * DWC3 revision 280A and prior:
668 * fifo_size = mult * (max_packet / mdwidth) + 1;
669 *
670 * DWC3 revision 290A and onwards:
671 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
672 *
673 * The max packet size is set to 1024, as the txfifo requirements mainly apply
674 * to super speed USB use cases. However, it is safe to overestimate the fifo
675 * allocations for other scenarios, i.e. high speed USB.
676 */
677static int dwc3_gadget_calc_tx_fifo_size(struct dwc3 *dwc, int mult)
678{
679 int max_packet = 1024;
680 int fifo_size;
681 int mdwidth;
682
683 mdwidth = dwc3_mdwidth(dwc);
684
685 /* MDWIDTH is represented in bits, we need it in bytes */
686 mdwidth >>= 3;
687
688 if (DWC3_VER_IS_PRIOR(DWC3, 290A))
689 fifo_size = mult * (max_packet / mdwidth) + 1;
690 else
691 fifo_size = mult * ((max_packet + mdwidth) / mdwidth) + 1;
692 return fifo_size;
693}
694
695/**
696 * dwc3_gadget_clear_tx_fifos - Clears txfifo allocation
697 * @dwc: pointer to the DWC3 context
698 *
699 * Iterates through all the endpoint registers and clears the previous txfifo
700 * allocations.
701 */
702void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
703{
704 struct dwc3_ep *dep;
705 int fifo_depth;
706 int size;
707 int num;
708
709 if (!dwc->do_fifo_resize)
710 return;
711
712 /* Read ep0IN related TXFIFO size */
713 dep = dwc->eps[1];
714 size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
715 if (DWC3_IP_IS(DWC3))
716 fifo_depth = DWC3_GTXFIFOSIZ_TXFDEP(size);
717 else
718 fifo_depth = DWC31_GTXFIFOSIZ_TXFDEP(size);
719
720 dwc->last_fifo_depth = fifo_depth;
721 /* Clear existing TXFIFO for all IN eps except ep0 */
722 for (num = 3; num < min_t(int, dwc->num_eps, DWC3_ENDPOINTS_NUM);
723 num += 2) {
724 dep = dwc->eps[num];
725 /* Don't change TXFRAMNUM on usb31 version */
726 size = DWC3_IP_IS(DWC3) ? 0 :
727 dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1)) &
728 DWC31_GTXFIFOSIZ_TXFRAMNUM;
729
730 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size);
731 dep->flags &= ~DWC3_EP_TXFIFO_RESIZED;
732 }
733 dwc->num_ep_resized = 0;
734}
735
736/*
737 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
738 * @dwc: pointer to our context structure
739 *
740 * This function will a best effort FIFO allocation in order
741 * to improve FIFO usage and throughput, while still allowing
742 * us to enable as many endpoints as possible.
743 *
744 * Keep in mind that this operation will be highly dependent
745 * on the configured size for RAM1 - which contains TxFifo -,
746 * the amount of endpoints enabled on coreConsultant tool, and
747 * the width of the Master Bus.
748 *
749 * In general, FIFO depths are represented with the following equation:
750 *
751 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
752 *
753 * In conjunction with dwc3_gadget_check_config(), this resizing logic will
754 * ensure that all endpoints will have enough internal memory for one max
755 * packet per endpoint.
756 */
757static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
758{
759 struct dwc3 *dwc = dep->dwc;
760 int fifo_0_start;
761 int ram1_depth;
762 int fifo_size;
763 int min_depth;
764 int num_in_ep;
765 int remaining;
766 int num_fifos = 1;
767 int fifo;
768 int tmp;
769
770 if (!dwc->do_fifo_resize)
771 return 0;
772
773 /* resize IN endpoints except ep0 */
774 if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1)
775 return 0;
776
777 /* bail if already resized */
778 if (dep->flags & DWC3_EP_TXFIFO_RESIZED)
779 return 0;
780
781 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
782
783 if ((dep->endpoint.maxburst > 1 &&
784 usb_endpoint_xfer_bulk(dep->endpoint.desc)) ||
785 usb_endpoint_xfer_isoc(dep->endpoint.desc))
786 num_fifos = 3;
787
788 if (dep->endpoint.maxburst > 6 &&
789 (usb_endpoint_xfer_bulk(dep->endpoint.desc) ||
790 usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31))
791 num_fifos = dwc->tx_fifo_resize_max_num;
792
793 /* FIFO size for a single buffer */
794 fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1);
795
796 /* Calculate the number of remaining EPs w/o any FIFO */
797 num_in_ep = dwc->max_cfg_eps;
798 num_in_ep -= dwc->num_ep_resized;
799
800 /* Reserve at least one FIFO for the number of IN EPs */
801 min_depth = num_in_ep * (fifo + 1);
802 remaining = ram1_depth - min_depth - dwc->last_fifo_depth;
803 remaining = max_t(int, 0, remaining);
804 /*
805 * We've already reserved 1 FIFO per EP, so check what we can fit in
806 * addition to it. If there is not enough remaining space, allocate
807 * all the remaining space to the EP.
808 */
809 fifo_size = (num_fifos - 1) * fifo;
810 if (remaining < fifo_size)
811 fifo_size = remaining;
812
813 fifo_size += fifo;
814 /* Last increment according to the TX FIFO size equation */
815 fifo_size++;
816
817 /* Check if TXFIFOs start at non-zero addr */
818 tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
819 fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp);
820
821 fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16));
822 if (DWC3_IP_IS(DWC3))
823 dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
824 else
825 dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
826
827 /* Check fifo size allocation doesn't exceed available RAM size. */
828 if (dwc->last_fifo_depth >= ram1_depth) {
829 dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n",
830 dwc->last_fifo_depth, ram1_depth,
831 dep->endpoint.name, fifo_size);
832 if (DWC3_IP_IS(DWC3))
833 fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
834 else
835 fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
836
837 dwc->last_fifo_depth -= fifo_size;
838 return -ENOMEM;
839 }
840
841 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size);
842 dep->flags |= DWC3_EP_TXFIFO_RESIZED;
843 dwc->num_ep_resized++;
844
845 return 0;
846}
847
848/**
849 * __dwc3_gadget_ep_enable - initializes a hw endpoint
850 * @dep: endpoint to be initialized
851 * @action: one of INIT, MODIFY or RESTORE
852 *
853 * Caller should take care of locking. Execute all necessary commands to
854 * initialize a HW endpoint so it can be used by a gadget driver.
855 */
856static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
857{
858 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
859 struct dwc3 *dwc = dep->dwc;
860
861 u32 reg;
862 int ret;
863
864 if (!(dep->flags & DWC3_EP_ENABLED)) {
865 ret = dwc3_gadget_resize_tx_fifos(dep);
866 if (ret)
867 return ret;
868
869 ret = dwc3_gadget_start_config(dep);
870 if (ret)
871 return ret;
872 }
873
874 ret = dwc3_gadget_set_ep_config(dep, action);
875 if (ret)
876 return ret;
877
878 if (!(dep->flags & DWC3_EP_ENABLED)) {
879 struct dwc3_trb *trb_st_hw;
880 struct dwc3_trb *trb_link;
881
882 dep->type = usb_endpoint_type(desc);
883 dep->flags |= DWC3_EP_ENABLED;
884
885 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
886 reg |= DWC3_DALEPENA_EP(dep->number);
887 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
888
889 dep->trb_dequeue = 0;
890 dep->trb_enqueue = 0;
891
892 if (usb_endpoint_xfer_control(desc))
893 goto out;
894
895 /* Initialize the TRB ring */
896 memset(dep->trb_pool, 0,
897 sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
898
899 /* Link TRB. The HWO bit is never reset */
900 trb_st_hw = &dep->trb_pool[0];
901
902 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
903 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
904 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
905 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
906 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
907 }
908
909 /*
910 * Issue StartTransfer here with no-op TRB so we can always rely on No
911 * Response Update Transfer command.
912 */
913 if (usb_endpoint_xfer_bulk(desc) ||
914 usb_endpoint_xfer_int(desc)) {
915 struct dwc3_gadget_ep_cmd_params params;
916 struct dwc3_trb *trb;
917 dma_addr_t trb_dma;
918 u32 cmd;
919
920 memset(¶ms, 0, sizeof(params));
921 trb = &dep->trb_pool[0];
922 trb_dma = dwc3_trb_dma_offset(dep, trb);
923
924 params.param0 = upper_32_bits(trb_dma);
925 params.param1 = lower_32_bits(trb_dma);
926
927 cmd = DWC3_DEPCMD_STARTTRANSFER;
928
929 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
930 if (ret < 0)
931 return ret;
932
933 if (dep->stream_capable) {
934 /*
935 * For streams, at start, there maybe a race where the
936 * host primes the endpoint before the function driver
937 * queues a request to initiate a stream. In that case,
938 * the controller will not see the prime to generate the
939 * ERDY and start stream. To workaround this, issue a
940 * no-op TRB as normal, but end it immediately. As a
941 * result, when the function driver queues the request,
942 * the next START_TRANSFER command will cause the
943 * controller to generate an ERDY to initiate the
944 * stream.
945 */
946 dwc3_stop_active_transfer(dep, true, true);
947
948 /*
949 * All stream eps will reinitiate stream on NoStream
950 * rejection until we can determine that the host can
951 * prime after the first transfer.
952 *
953 * However, if the controller is capable of
954 * TXF_FLUSH_BYPASS, then IN direction endpoints will
955 * automatically restart the stream without the driver
956 * initiation.
957 */
958 if (!dep->direction ||
959 !(dwc->hwparams.hwparams9 &
960 DWC3_GHWPARAMS9_DEV_TXF_FLUSH_BYPASS))
961 dep->flags |= DWC3_EP_FORCE_RESTART_STREAM;
962 }
963 }
964
965out:
966 trace_dwc3_gadget_ep_enable(dep);
967
968 return 0;
969}
970
971void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep, int status)
972{
973 struct dwc3_request *req;
974
975 dwc3_stop_active_transfer(dep, true, false);
976
977 /* If endxfer is delayed, avoid unmapping requests */
978 if (dep->flags & DWC3_EP_DELAY_STOP)
979 return;
980
981 /* - giveback all requests to gadget driver */
982 while (!list_empty(&dep->started_list)) {
983 req = next_request(&dep->started_list);
984
985 dwc3_gadget_giveback(dep, req, status);
986 }
987
988 while (!list_empty(&dep->pending_list)) {
989 req = next_request(&dep->pending_list);
990
991 dwc3_gadget_giveback(dep, req, status);
992 }
993
994 while (!list_empty(&dep->cancelled_list)) {
995 req = next_request(&dep->cancelled_list);
996
997 dwc3_gadget_giveback(dep, req, status);
998 }
999}
1000
1001/**
1002 * __dwc3_gadget_ep_disable - disables a hw endpoint
1003 * @dep: the endpoint to disable
1004 *
1005 * This function undoes what __dwc3_gadget_ep_enable did and also removes
1006 * requests which are currently being processed by the hardware and those which
1007 * are not yet scheduled.
1008 *
1009 * Caller should take care of locking.
1010 */
1011static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
1012{
1013 struct dwc3 *dwc = dep->dwc;
1014 u32 reg;
1015 u32 mask;
1016
1017 trace_dwc3_gadget_ep_disable(dep);
1018
1019 /* make sure HW endpoint isn't stalled */
1020 if (dep->flags & DWC3_EP_STALL)
1021 __dwc3_gadget_ep_set_halt(dep, 0, false);
1022
1023 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
1024 reg &= ~DWC3_DALEPENA_EP(dep->number);
1025 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
1026
1027 dwc3_remove_requests(dwc, dep, -ESHUTDOWN);
1028
1029 dep->stream_capable = false;
1030 dep->type = 0;
1031 mask = DWC3_EP_TXFIFO_RESIZED;
1032 /*
1033 * dwc3_remove_requests() can exit early if DWC3 EP delayed stop is
1034 * set. Do not clear DEP flags, so that the end transfer command will
1035 * be reattempted during the next SETUP stage.
1036 */
1037 if (dep->flags & DWC3_EP_DELAY_STOP)
1038 mask |= (DWC3_EP_DELAY_STOP | DWC3_EP_TRANSFER_STARTED);
1039 dep->flags &= mask;
1040
1041 /* Clear out the ep descriptors for non-ep0 */
1042 if (dep->number > 1) {
1043 dep->endpoint.comp_desc = NULL;
1044 dep->endpoint.desc = NULL;
1045 }
1046
1047 return 0;
1048}
1049
1050/* -------------------------------------------------------------------------- */
1051
1052static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
1053 const struct usb_endpoint_descriptor *desc)
1054{
1055 return -EINVAL;
1056}
1057
1058static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
1059{
1060 return -EINVAL;
1061}
1062
1063/* -------------------------------------------------------------------------- */
1064
1065static int dwc3_gadget_ep_enable(struct usb_ep *ep,
1066 const struct usb_endpoint_descriptor *desc)
1067{
1068 struct dwc3_ep *dep;
1069 struct dwc3 *dwc;
1070 unsigned long flags;
1071 int ret;
1072
1073 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1074 pr_debug("dwc3: invalid parameters\n");
1075 return -EINVAL;
1076 }
1077
1078 if (!desc->wMaxPacketSize) {
1079 pr_debug("dwc3: missing wMaxPacketSize\n");
1080 return -EINVAL;
1081 }
1082
1083 dep = to_dwc3_ep(ep);
1084 dwc = dep->dwc;
1085
1086 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
1087 "%s is already enabled\n",
1088 dep->name))
1089 return 0;
1090
1091 spin_lock_irqsave(&dwc->lock, flags);
1092 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
1093 spin_unlock_irqrestore(&dwc->lock, flags);
1094
1095 return ret;
1096}
1097
1098static int dwc3_gadget_ep_disable(struct usb_ep *ep)
1099{
1100 struct dwc3_ep *dep;
1101 struct dwc3 *dwc;
1102 unsigned long flags;
1103 int ret;
1104
1105 if (!ep) {
1106 pr_debug("dwc3: invalid parameters\n");
1107 return -EINVAL;
1108 }
1109
1110 dep = to_dwc3_ep(ep);
1111 dwc = dep->dwc;
1112
1113 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
1114 "%s is already disabled\n",
1115 dep->name))
1116 return 0;
1117
1118 spin_lock_irqsave(&dwc->lock, flags);
1119 ret = __dwc3_gadget_ep_disable(dep);
1120 spin_unlock_irqrestore(&dwc->lock, flags);
1121
1122 return ret;
1123}
1124
1125static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
1126 gfp_t gfp_flags)
1127{
1128 struct dwc3_request *req;
1129 struct dwc3_ep *dep = to_dwc3_ep(ep);
1130
1131 req = kzalloc(sizeof(*req), gfp_flags);
1132 if (!req)
1133 return NULL;
1134
1135 req->direction = dep->direction;
1136 req->epnum = dep->number;
1137 req->dep = dep;
1138 req->status = DWC3_REQUEST_STATUS_UNKNOWN;
1139
1140 trace_dwc3_alloc_request(req);
1141
1142 return &req->request;
1143}
1144
1145static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
1146 struct usb_request *request)
1147{
1148 struct dwc3_request *req = to_dwc3_request(request);
1149
1150 trace_dwc3_free_request(req);
1151 kfree(req);
1152}
1153
1154/**
1155 * dwc3_ep_prev_trb - returns the previous TRB in the ring
1156 * @dep: The endpoint with the TRB ring
1157 * @index: The index of the current TRB in the ring
1158 *
1159 * Returns the TRB prior to the one pointed to by the index. If the
1160 * index is 0, we will wrap backwards, skip the link TRB, and return
1161 * the one just before that.
1162 */
1163static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
1164{
1165 u8 tmp = index;
1166
1167 if (!tmp)
1168 tmp = DWC3_TRB_NUM - 1;
1169
1170 return &dep->trb_pool[tmp - 1];
1171}
1172
1173static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
1174{
1175 u8 trbs_left;
1176
1177 /*
1178 * If the enqueue & dequeue are equal then the TRB ring is either full
1179 * or empty. It's considered full when there are DWC3_TRB_NUM-1 of TRBs
1180 * pending to be processed by the driver.
1181 */
1182 if (dep->trb_enqueue == dep->trb_dequeue) {
1183 /*
1184 * If there is any request remained in the started_list at
1185 * this point, that means there is no TRB available.
1186 */
1187 if (!list_empty(&dep->started_list))
1188 return 0;
1189
1190 return DWC3_TRB_NUM - 1;
1191 }
1192
1193 trbs_left = dep->trb_dequeue - dep->trb_enqueue;
1194 trbs_left &= (DWC3_TRB_NUM - 1);
1195
1196 if (dep->trb_dequeue < dep->trb_enqueue)
1197 trbs_left--;
1198
1199 return trbs_left;
1200}
1201
1202/**
1203 * dwc3_prepare_one_trb - setup one TRB from one request
1204 * @dep: endpoint for which this request is prepared
1205 * @req: dwc3_request pointer
1206 * @trb_length: buffer size of the TRB
1207 * @chain: should this TRB be chained to the next?
1208 * @node: only for isochronous endpoints. First TRB needs different type.
1209 * @use_bounce_buffer: set to use bounce buffer
1210 * @must_interrupt: set to interrupt on TRB completion
1211 */
1212static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
1213 struct dwc3_request *req, unsigned int trb_length,
1214 unsigned int chain, unsigned int node, bool use_bounce_buffer,
1215 bool must_interrupt)
1216{
1217 struct dwc3_trb *trb;
1218 dma_addr_t dma;
1219 unsigned int stream_id = req->request.stream_id;
1220 unsigned int short_not_ok = req->request.short_not_ok;
1221 unsigned int no_interrupt = req->request.no_interrupt;
1222 unsigned int is_last = req->request.is_last;
1223 struct dwc3 *dwc = dep->dwc;
1224 struct usb_gadget *gadget = dwc->gadget;
1225 enum usb_device_speed speed = gadget->speed;
1226
1227 if (use_bounce_buffer)
1228 dma = dep->dwc->bounce_addr;
1229 else if (req->request.num_sgs > 0)
1230 dma = sg_dma_address(req->start_sg);
1231 else
1232 dma = req->request.dma;
1233
1234 trb = &dep->trb_pool[dep->trb_enqueue];
1235
1236 if (!req->trb) {
1237 dwc3_gadget_move_started_request(req);
1238 req->trb = trb;
1239 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
1240 }
1241
1242 req->num_trbs++;
1243
1244 trb->size = DWC3_TRB_SIZE_LENGTH(trb_length);
1245 trb->bpl = lower_32_bits(dma);
1246 trb->bph = upper_32_bits(dma);
1247
1248 switch (usb_endpoint_type(dep->endpoint.desc)) {
1249 case USB_ENDPOINT_XFER_CONTROL:
1250 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
1251 break;
1252
1253 case USB_ENDPOINT_XFER_ISOC:
1254 if (!node) {
1255 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
1256
1257 /*
1258 * USB Specification 2.0 Section 5.9.2 states that: "If
1259 * there is only a single transaction in the microframe,
1260 * only a DATA0 data packet PID is used. If there are
1261 * two transactions per microframe, DATA1 is used for
1262 * the first transaction data packet and DATA0 is used
1263 * for the second transaction data packet. If there are
1264 * three transactions per microframe, DATA2 is used for
1265 * the first transaction data packet, DATA1 is used for
1266 * the second, and DATA0 is used for the third."
1267 *
1268 * IOW, we should satisfy the following cases:
1269 *
1270 * 1) length <= maxpacket
1271 * - DATA0
1272 *
1273 * 2) maxpacket < length <= (2 * maxpacket)
1274 * - DATA1, DATA0
1275 *
1276 * 3) (2 * maxpacket) < length <= (3 * maxpacket)
1277 * - DATA2, DATA1, DATA0
1278 */
1279 if (speed == USB_SPEED_HIGH) {
1280 struct usb_ep *ep = &dep->endpoint;
1281 unsigned int mult = 2;
1282 unsigned int maxp = usb_endpoint_maxp(ep->desc);
1283
1284 if (req->request.length <= (2 * maxp))
1285 mult--;
1286
1287 if (req->request.length <= maxp)
1288 mult--;
1289
1290 trb->size |= DWC3_TRB_SIZE_PCM1(mult);
1291 }
1292 } else {
1293 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
1294 }
1295
1296 if (!no_interrupt && !chain)
1297 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
1298 break;
1299
1300 case USB_ENDPOINT_XFER_BULK:
1301 case USB_ENDPOINT_XFER_INT:
1302 trb->ctrl = DWC3_TRBCTL_NORMAL;
1303 break;
1304 default:
1305 /*
1306 * This is only possible with faulty memory because we
1307 * checked it already :)
1308 */
1309 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
1310 usb_endpoint_type(dep->endpoint.desc));
1311 }
1312
1313 /*
1314 * Enable Continue on Short Packet
1315 * when endpoint is not a stream capable
1316 */
1317 if (usb_endpoint_dir_out(dep->endpoint.desc)) {
1318 if (!dep->stream_capable)
1319 trb->ctrl |= DWC3_TRB_CTRL_CSP;
1320
1321 if (short_not_ok)
1322 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
1323 }
1324
1325 /* All TRBs setup for MST must set CSP=1 when LST=0 */
1326 if (dep->stream_capable && DWC3_MST_CAPABLE(&dwc->hwparams))
1327 trb->ctrl |= DWC3_TRB_CTRL_CSP;
1328
1329 if ((!no_interrupt && !chain) || must_interrupt)
1330 trb->ctrl |= DWC3_TRB_CTRL_IOC;
1331
1332 if (chain)
1333 trb->ctrl |= DWC3_TRB_CTRL_CHN;
1334 else if (dep->stream_capable && is_last &&
1335 !DWC3_MST_CAPABLE(&dwc->hwparams))
1336 trb->ctrl |= DWC3_TRB_CTRL_LST;
1337
1338 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
1339 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
1340
1341 /*
1342 * As per data book 4.2.3.2TRB Control Bit Rules section
1343 *
1344 * The controller autonomously checks the HWO field of a TRB to determine if the
1345 * entire TRB is valid. Therefore, software must ensure that the rest of the TRB
1346 * is valid before setting the HWO field to '1'. In most systems, this means that
1347 * software must update the fourth DWORD of a TRB last.
1348 *
1349 * However there is a possibility of CPU re-ordering here which can cause
1350 * controller to observe the HWO bit set prematurely.
1351 * Add a write memory barrier to prevent CPU re-ordering.
1352 */
1353 wmb();
1354 trb->ctrl |= DWC3_TRB_CTRL_HWO;
1355
1356 dwc3_ep_inc_enq(dep);
1357
1358 trace_dwc3_prepare_trb(dep, trb);
1359}
1360
1361static bool dwc3_needs_extra_trb(struct dwc3_ep *dep, struct dwc3_request *req)
1362{
1363 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1364 unsigned int rem = req->request.length % maxp;
1365
1366 if ((req->request.length && req->request.zero && !rem &&
1367 !usb_endpoint_xfer_isoc(dep->endpoint.desc)) ||
1368 (!req->direction && rem))
1369 return true;
1370
1371 return false;
1372}
1373
1374/**
1375 * dwc3_prepare_last_sg - prepare TRBs for the last SG entry
1376 * @dep: The endpoint that the request belongs to
1377 * @req: The request to prepare
1378 * @entry_length: The last SG entry size
1379 * @node: Indicates whether this is not the first entry (for isoc only)
1380 *
1381 * Return the number of TRBs prepared.
1382 */
1383static int dwc3_prepare_last_sg(struct dwc3_ep *dep,
1384 struct dwc3_request *req, unsigned int entry_length,
1385 unsigned int node)
1386{
1387 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1388 unsigned int rem = req->request.length % maxp;
1389 unsigned int num_trbs = 1;
1390
1391 if (dwc3_needs_extra_trb(dep, req))
1392 num_trbs++;
1393
1394 if (dwc3_calc_trbs_left(dep) < num_trbs)
1395 return 0;
1396
1397 req->needs_extra_trb = num_trbs > 1;
1398
1399 /* Prepare a normal TRB */
1400 if (req->direction || req->request.length)
1401 dwc3_prepare_one_trb(dep, req, entry_length,
1402 req->needs_extra_trb, node, false, false);
1403
1404 /* Prepare extra TRBs for ZLP and MPS OUT transfer alignment */
1405 if ((!req->direction && !req->request.length) || req->needs_extra_trb)
1406 dwc3_prepare_one_trb(dep, req,
1407 req->direction ? 0 : maxp - rem,
1408 false, 1, true, false);
1409
1410 return num_trbs;
1411}
1412
1413static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,
1414 struct dwc3_request *req)
1415{
1416 struct scatterlist *sg = req->start_sg;
1417 struct scatterlist *s;
1418 int i;
1419 unsigned int length = req->request.length;
1420 unsigned int remaining = req->request.num_mapped_sgs
1421 - req->num_queued_sgs;
1422 unsigned int num_trbs = req->num_trbs;
1423 bool needs_extra_trb = dwc3_needs_extra_trb(dep, req);
1424
1425 /*
1426 * If we resume preparing the request, then get the remaining length of
1427 * the request and resume where we left off.
1428 */
1429 for_each_sg(req->request.sg, s, req->num_queued_sgs, i)
1430 length -= sg_dma_len(s);
1431
1432 for_each_sg(sg, s, remaining, i) {
1433 unsigned int num_trbs_left = dwc3_calc_trbs_left(dep);
1434 unsigned int trb_length;
1435 bool must_interrupt = false;
1436 bool last_sg = false;
1437
1438 trb_length = min_t(unsigned int, length, sg_dma_len(s));
1439
1440 length -= trb_length;
1441
1442 /*
1443 * IOMMU driver is coalescing the list of sgs which shares a
1444 * page boundary into one and giving it to USB driver. With
1445 * this the number of sgs mapped is not equal to the number of
1446 * sgs passed. So mark the chain bit to false if it isthe last
1447 * mapped sg.
1448 */
1449 if ((i == remaining - 1) || !length)
1450 last_sg = true;
1451
1452 if (!num_trbs_left)
1453 break;
1454
1455 if (last_sg) {
1456 if (!dwc3_prepare_last_sg(dep, req, trb_length, i))
1457 break;
1458 } else {
1459 /*
1460 * Look ahead to check if we have enough TRBs for the
1461 * next SG entry. If not, set interrupt on this TRB to
1462 * resume preparing the next SG entry when more TRBs are
1463 * free.
1464 */
1465 if (num_trbs_left == 1 || (needs_extra_trb &&
1466 num_trbs_left <= 2 &&
1467 sg_dma_len(sg_next(s)) >= length)) {
1468 struct dwc3_request *r;
1469
1470 /* Check if previous requests already set IOC */
1471 list_for_each_entry(r, &dep->started_list, list) {
1472 if (r != req && !r->request.no_interrupt)
1473 break;
1474
1475 if (r == req)
1476 must_interrupt = true;
1477 }
1478 }
1479
1480 dwc3_prepare_one_trb(dep, req, trb_length, 1, i, false,
1481 must_interrupt);
1482 }
1483
1484 /*
1485 * There can be a situation where all sgs in sglist are not
1486 * queued because of insufficient trb number. To handle this
1487 * case, update start_sg to next sg to be queued, so that
1488 * we have free trbs we can continue queuing from where we
1489 * previously stopped
1490 */
1491 if (!last_sg)
1492 req->start_sg = sg_next(s);
1493
1494 req->num_queued_sgs++;
1495 req->num_pending_sgs--;
1496
1497 /*
1498 * The number of pending SG entries may not correspond to the
1499 * number of mapped SG entries. If all the data are queued, then
1500 * don't include unused SG entries.
1501 */
1502 if (length == 0) {
1503 req->num_pending_sgs = 0;
1504 break;
1505 }
1506
1507 if (must_interrupt)
1508 break;
1509 }
1510
1511 return req->num_trbs - num_trbs;
1512}
1513
1514static int dwc3_prepare_trbs_linear(struct dwc3_ep *dep,
1515 struct dwc3_request *req)
1516{
1517 return dwc3_prepare_last_sg(dep, req, req->request.length, 0);
1518}
1519
1520/*
1521 * dwc3_prepare_trbs - setup TRBs from requests
1522 * @dep: endpoint for which requests are being prepared
1523 *
1524 * The function goes through the requests list and sets up TRBs for the
1525 * transfers. The function returns once there are no more TRBs available or
1526 * it runs out of requests.
1527 *
1528 * Returns the number of TRBs prepared or negative errno.
1529 */
1530static int dwc3_prepare_trbs(struct dwc3_ep *dep)
1531{
1532 struct dwc3_request *req, *n;
1533 int ret = 0;
1534
1535 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1536
1537 /*
1538 * We can get in a situation where there's a request in the started list
1539 * but there weren't enough TRBs to fully kick it in the first time
1540 * around, so it has been waiting for more TRBs to be freed up.
1541 *
1542 * In that case, we should check if we have a request with pending_sgs
1543 * in the started list and prepare TRBs for that request first,
1544 * otherwise we will prepare TRBs completely out of order and that will
1545 * break things.
1546 */
1547 list_for_each_entry(req, &dep->started_list, list) {
1548 if (req->num_pending_sgs > 0) {
1549 ret = dwc3_prepare_trbs_sg(dep, req);
1550 if (!ret || req->num_pending_sgs)
1551 return ret;
1552 }
1553
1554 if (!dwc3_calc_trbs_left(dep))
1555 return ret;
1556
1557 /*
1558 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
1559 * burst capability may try to read and use TRBs beyond the
1560 * active transfer instead of stopping.
1561 */
1562 if (dep->stream_capable && req->request.is_last &&
1563 !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
1564 return ret;
1565 }
1566
1567 list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1568 struct dwc3 *dwc = dep->dwc;
1569
1570 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1571 dep->direction);
1572 if (ret)
1573 return ret;
1574
1575 req->sg = req->request.sg;
1576 req->start_sg = req->sg;
1577 req->num_queued_sgs = 0;
1578 req->num_pending_sgs = req->request.num_mapped_sgs;
1579
1580 if (req->num_pending_sgs > 0) {
1581 ret = dwc3_prepare_trbs_sg(dep, req);
1582 if (req->num_pending_sgs)
1583 return ret;
1584 } else {
1585 ret = dwc3_prepare_trbs_linear(dep, req);
1586 }
1587
1588 if (!ret || !dwc3_calc_trbs_left(dep))
1589 return ret;
1590
1591 /*
1592 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
1593 * burst capability may try to read and use TRBs beyond the
1594 * active transfer instead of stopping.
1595 */
1596 if (dep->stream_capable && req->request.is_last &&
1597 !DWC3_MST_CAPABLE(&dwc->hwparams))
1598 return ret;
1599 }
1600
1601 return ret;
1602}
1603
1604static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep);
1605
1606static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
1607{
1608 struct dwc3_gadget_ep_cmd_params params;
1609 struct dwc3_request *req;
1610 int starting;
1611 int ret;
1612 u32 cmd;
1613
1614 /*
1615 * Note that it's normal to have no new TRBs prepared (i.e. ret == 0).
1616 * This happens when we need to stop and restart a transfer such as in
1617 * the case of reinitiating a stream or retrying an isoc transfer.
1618 */
1619 ret = dwc3_prepare_trbs(dep);
1620 if (ret < 0)
1621 return ret;
1622
1623 starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
1624
1625 /*
1626 * If there's no new TRB prepared and we don't need to restart a
1627 * transfer, there's no need to update the transfer.
1628 */
1629 if (!ret && !starting)
1630 return ret;
1631
1632 req = next_request(&dep->started_list);
1633 if (!req) {
1634 dep->flags |= DWC3_EP_PENDING_REQUEST;
1635 return 0;
1636 }
1637
1638 memset(¶ms, 0, sizeof(params));
1639
1640 if (starting) {
1641 params.param0 = upper_32_bits(req->trb_dma);
1642 params.param1 = lower_32_bits(req->trb_dma);
1643 cmd = DWC3_DEPCMD_STARTTRANSFER;
1644
1645 if (dep->stream_capable)
1646 cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id);
1647
1648 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
1649 cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
1650 } else {
1651 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1652 DWC3_DEPCMD_PARAM(dep->resource_index);
1653 }
1654
1655 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1656 if (ret < 0) {
1657 struct dwc3_request *tmp;
1658
1659 if (ret == -EAGAIN)
1660 return ret;
1661
1662 dwc3_stop_active_transfer(dep, true, true);
1663
1664 list_for_each_entry_safe(req, tmp, &dep->started_list, list)
1665 dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_DEQUEUED);
1666
1667 /* If ep isn't started, then there's no end transfer pending */
1668 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
1669 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
1670
1671 return ret;
1672 }
1673
1674 if (dep->stream_capable && req->request.is_last &&
1675 !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
1676 dep->flags |= DWC3_EP_WAIT_TRANSFER_COMPLETE;
1677
1678 return 0;
1679}
1680
1681static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1682{
1683 u32 reg;
1684
1685 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1686 return DWC3_DSTS_SOFFN(reg);
1687}
1688
1689/**
1690 * __dwc3_stop_active_transfer - stop the current active transfer
1691 * @dep: isoc endpoint
1692 * @force: set forcerm bit in the command
1693 * @interrupt: command complete interrupt after End Transfer command
1694 *
1695 * When setting force, the ForceRM bit will be set. In that case
1696 * the controller won't update the TRB progress on command
1697 * completion. It also won't clear the HWO bit in the TRB.
1698 * The command will also not complete immediately in that case.
1699 */
1700static int __dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt)
1701{
1702 struct dwc3_gadget_ep_cmd_params params;
1703 u32 cmd;
1704 int ret;
1705
1706 cmd = DWC3_DEPCMD_ENDTRANSFER;
1707 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
1708 cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0;
1709 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1710 memset(¶ms, 0, sizeof(params));
1711 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1712 /*
1713 * If the End Transfer command was timed out while the device is
1714 * not in SETUP phase, it's possible that an incoming Setup packet
1715 * may prevent the command's completion. Let's retry when the
1716 * ep0state returns to EP0_SETUP_PHASE.
1717 */
1718 if (ret == -ETIMEDOUT && dep->dwc->ep0state != EP0_SETUP_PHASE) {
1719 dep->flags |= DWC3_EP_DELAY_STOP;
1720 return 0;
1721 }
1722 WARN_ON_ONCE(ret);
1723 dep->resource_index = 0;
1724
1725 if (!interrupt)
1726 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
1727 else if (!ret)
1728 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
1729
1730 dep->flags &= ~DWC3_EP_DELAY_STOP;
1731 return ret;
1732}
1733
1734/**
1735 * dwc3_gadget_start_isoc_quirk - workaround invalid frame number
1736 * @dep: isoc endpoint
1737 *
1738 * This function tests for the correct combination of BIT[15:14] from the 16-bit
1739 * microframe number reported by the XferNotReady event for the future frame
1740 * number to start the isoc transfer.
1741 *
1742 * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
1743 * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the
1744 * XferNotReady event are invalid. The driver uses this number to schedule the
1745 * isochronous transfer and passes it to the START TRANSFER command. Because
1746 * this number is invalid, the command may fail. If BIT[15:14] matches the
1747 * internal 16-bit microframe, the START TRANSFER command will pass and the
1748 * transfer will start at the scheduled time, if it is off by 1, the command
1749 * will still pass, but the transfer will start 2 seconds in the future. For all
1750 * other conditions, the START TRANSFER command will fail with bus-expiry.
1751 *
1752 * In order to workaround this issue, we can test for the correct combination of
1753 * BIT[15:14] by sending START TRANSFER commands with different values of
1754 * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart
1755 * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status.
1756 * As the result, within the 4 possible combinations for BIT[15:14], there will
1757 * be 2 successful and 2 failure START COMMAND status. One of the 2 successful
1758 * command status will result in a 2-second delay start. The smaller BIT[15:14]
1759 * value is the correct combination.
1760 *
1761 * Since there are only 4 outcomes and the results are ordered, we can simply
1762 * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to
1763 * deduce the smaller successful combination.
1764 *
1765 * Let test0 = test status for combination 'b00 and test1 = test status for 'b01
1766 * of BIT[15:14]. The correct combination is as follow:
1767 *
1768 * if test0 fails and test1 passes, BIT[15:14] is 'b01
1769 * if test0 fails and test1 fails, BIT[15:14] is 'b10
1770 * if test0 passes and test1 fails, BIT[15:14] is 'b11
1771 * if test0 passes and test1 passes, BIT[15:14] is 'b00
1772 *
1773 * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
1774 * endpoints.
1775 */
1776static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
1777{
1778 int cmd_status = 0;
1779 bool test0;
1780 bool test1;
1781
1782 while (dep->combo_num < 2) {
1783 struct dwc3_gadget_ep_cmd_params params;
1784 u32 test_frame_number;
1785 u32 cmd;
1786
1787 /*
1788 * Check if we can start isoc transfer on the next interval or
1789 * 4 uframes in the future with BIT[15:14] as dep->combo_num
1790 */
1791 test_frame_number = dep->frame_number & DWC3_FRNUMBER_MASK;
1792 test_frame_number |= dep->combo_num << 14;
1793 test_frame_number += max_t(u32, 4, dep->interval);
1794
1795 params.param0 = upper_32_bits(dep->dwc->bounce_addr);
1796 params.param1 = lower_32_bits(dep->dwc->bounce_addr);
1797
1798 cmd = DWC3_DEPCMD_STARTTRANSFER;
1799 cmd |= DWC3_DEPCMD_PARAM(test_frame_number);
1800 cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1801
1802 /* Redo if some other failure beside bus-expiry is received */
1803 if (cmd_status && cmd_status != -EAGAIN) {
1804 dep->start_cmd_status = 0;
1805 dep->combo_num = 0;
1806 return 0;
1807 }
1808
1809 /* Store the first test status */
1810 if (dep->combo_num == 0)
1811 dep->start_cmd_status = cmd_status;
1812
1813 dep->combo_num++;
1814
1815 /*
1816 * End the transfer if the START_TRANSFER command is successful
1817 * to wait for the next XferNotReady to test the command again
1818 */
1819 if (cmd_status == 0) {
1820 dwc3_stop_active_transfer(dep, true, true);
1821 return 0;
1822 }
1823 }
1824
1825 /* test0 and test1 are both completed at this point */
1826 test0 = (dep->start_cmd_status == 0);
1827 test1 = (cmd_status == 0);
1828
1829 if (!test0 && test1)
1830 dep->combo_num = 1;
1831 else if (!test0 && !test1)
1832 dep->combo_num = 2;
1833 else if (test0 && !test1)
1834 dep->combo_num = 3;
1835 else if (test0 && test1)
1836 dep->combo_num = 0;
1837
1838 dep->frame_number &= DWC3_FRNUMBER_MASK;
1839 dep->frame_number |= dep->combo_num << 14;
1840 dep->frame_number += max_t(u32, 4, dep->interval);
1841
1842 /* Reinitialize test variables */
1843 dep->start_cmd_status = 0;
1844 dep->combo_num = 0;
1845
1846 return __dwc3_gadget_kick_transfer(dep);
1847}
1848
1849static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
1850{
1851 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
1852 struct dwc3 *dwc = dep->dwc;
1853 int ret;
1854 int i;
1855
1856 if (list_empty(&dep->pending_list) &&
1857 list_empty(&dep->started_list)) {
1858 dep->flags |= DWC3_EP_PENDING_REQUEST;
1859 return -EAGAIN;
1860 }
1861
1862 if (!dwc->dis_start_transfer_quirk &&
1863 (DWC3_VER_IS_PRIOR(DWC31, 170A) ||
1864 DWC3_VER_TYPE_IS_WITHIN(DWC31, 170A, EA01, EA06))) {
1865 if (dwc->gadget->speed <= USB_SPEED_HIGH && dep->direction)
1866 return dwc3_gadget_start_isoc_quirk(dep);
1867 }
1868
1869 if (desc->bInterval <= 14 &&
1870 dwc->gadget->speed >= USB_SPEED_HIGH) {
1871 u32 frame = __dwc3_gadget_get_frame(dwc);
1872 bool rollover = frame <
1873 (dep->frame_number & DWC3_FRNUMBER_MASK);
1874
1875 /*
1876 * frame_number is set from XferNotReady and may be already
1877 * out of date. DSTS only provides the lower 14 bit of the
1878 * current frame number. So add the upper two bits of
1879 * frame_number and handle a possible rollover.
1880 * This will provide the correct frame_number unless more than
1881 * rollover has happened since XferNotReady.
1882 */
1883
1884 dep->frame_number = (dep->frame_number & ~DWC3_FRNUMBER_MASK) |
1885 frame;
1886 if (rollover)
1887 dep->frame_number += BIT(14);
1888 }
1889
1890 for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
1891 int future_interval = i + 1;
1892
1893 /* Give the controller at least 500us to schedule transfers */
1894 if (desc->bInterval < 3)
1895 future_interval += 3 - desc->bInterval;
1896
1897 dep->frame_number = DWC3_ALIGN_FRAME(dep, future_interval);
1898
1899 ret = __dwc3_gadget_kick_transfer(dep);
1900 if (ret != -EAGAIN)
1901 break;
1902 }
1903
1904 /*
1905 * After a number of unsuccessful start attempts due to bus-expiry
1906 * status, issue END_TRANSFER command and retry on the next XferNotReady
1907 * event.
1908 */
1909 if (ret == -EAGAIN)
1910 ret = __dwc3_stop_active_transfer(dep, false, true);
1911
1912 return ret;
1913}
1914
1915static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1916{
1917 struct dwc3 *dwc = dep->dwc;
1918
1919 if (!dep->endpoint.desc || !dwc->pullups_connected || !dwc->connected) {
1920 dev_dbg(dwc->dev, "%s: can't queue to disabled endpoint\n",
1921 dep->name);
1922 return -ESHUTDOWN;
1923 }
1924
1925 if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
1926 &req->request, req->dep->name))
1927 return -EINVAL;
1928
1929 if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
1930 "%s: request %pK already in flight\n",
1931 dep->name, &req->request))
1932 return -EINVAL;
1933
1934 pm_runtime_get(dwc->dev);
1935
1936 req->request.actual = 0;
1937 req->request.status = -EINPROGRESS;
1938
1939 trace_dwc3_ep_queue(req);
1940
1941 list_add_tail(&req->list, &dep->pending_list);
1942 req->status = DWC3_REQUEST_STATUS_QUEUED;
1943
1944 if (dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)
1945 return 0;
1946
1947 /*
1948 * Start the transfer only after the END_TRANSFER is completed
1949 * and endpoint STALL is cleared.
1950 */
1951 if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
1952 (dep->flags & DWC3_EP_WEDGE) ||
1953 (dep->flags & DWC3_EP_DELAY_STOP) ||
1954 (dep->flags & DWC3_EP_STALL)) {
1955 dep->flags |= DWC3_EP_DELAY_START;
1956 return 0;
1957 }
1958
1959 /*
1960 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1961 * wait for a XferNotReady event so we will know what's the current
1962 * (micro-)frame number.
1963 *
1964 * Without this trick, we are very, very likely gonna get Bus Expiry
1965 * errors which will force us issue EndTransfer command.
1966 */
1967 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1968 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
1969 if ((dep->flags & DWC3_EP_PENDING_REQUEST))
1970 return __dwc3_gadget_start_isoc(dep);
1971
1972 return 0;
1973 }
1974 }
1975
1976 __dwc3_gadget_kick_transfer(dep);
1977
1978 return 0;
1979}
1980
1981static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1982 gfp_t gfp_flags)
1983{
1984 struct dwc3_request *req = to_dwc3_request(request);
1985 struct dwc3_ep *dep = to_dwc3_ep(ep);
1986 struct dwc3 *dwc = dep->dwc;
1987
1988 unsigned long flags;
1989
1990 int ret;
1991
1992 spin_lock_irqsave(&dwc->lock, flags);
1993 ret = __dwc3_gadget_ep_queue(dep, req);
1994 spin_unlock_irqrestore(&dwc->lock, flags);
1995
1996 return ret;
1997}
1998
1999static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req)
2000{
2001 int i;
2002
2003 /* If req->trb is not set, then the request has not started */
2004 if (!req->trb)
2005 return;
2006
2007 /*
2008 * If request was already started, this means we had to
2009 * stop the transfer. With that we also need to ignore
2010 * all TRBs used by the request, however TRBs can only
2011 * be modified after completion of END_TRANSFER
2012 * command. So what we do here is that we wait for
2013 * END_TRANSFER completion and only after that, we jump
2014 * over TRBs by clearing HWO and incrementing dequeue
2015 * pointer.
2016 */
2017 for (i = 0; i < req->num_trbs; i++) {
2018 struct dwc3_trb *trb;
2019
2020 trb = &dep->trb_pool[dep->trb_dequeue];
2021 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2022 dwc3_ep_inc_deq(dep);
2023 }
2024
2025 req->num_trbs = 0;
2026}
2027
2028static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
2029{
2030 struct dwc3_request *req;
2031 struct dwc3 *dwc = dep->dwc;
2032
2033 while (!list_empty(&dep->cancelled_list)) {
2034 req = next_request(&dep->cancelled_list);
2035 dwc3_gadget_ep_skip_trbs(dep, req);
2036 switch (req->status) {
2037 case DWC3_REQUEST_STATUS_DISCONNECTED:
2038 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
2039 break;
2040 case DWC3_REQUEST_STATUS_DEQUEUED:
2041 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2042 break;
2043 case DWC3_REQUEST_STATUS_STALLED:
2044 dwc3_gadget_giveback(dep, req, -EPIPE);
2045 break;
2046 default:
2047 dev_err(dwc->dev, "request cancelled with wrong reason:%d\n", req->status);
2048 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2049 break;
2050 }
2051 /*
2052 * The endpoint is disabled, let the dwc3_remove_requests()
2053 * handle the cleanup.
2054 */
2055 if (!dep->endpoint.desc)
2056 break;
2057 }
2058}
2059
2060static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
2061 struct usb_request *request)
2062{
2063 struct dwc3_request *req = to_dwc3_request(request);
2064 struct dwc3_request *r = NULL;
2065
2066 struct dwc3_ep *dep = to_dwc3_ep(ep);
2067 struct dwc3 *dwc = dep->dwc;
2068
2069 unsigned long flags;
2070 int ret = 0;
2071
2072 trace_dwc3_ep_dequeue(req);
2073
2074 spin_lock_irqsave(&dwc->lock, flags);
2075
2076 list_for_each_entry(r, &dep->cancelled_list, list) {
2077 if (r == req)
2078 goto out;
2079 }
2080
2081 list_for_each_entry(r, &dep->pending_list, list) {
2082 if (r == req) {
2083 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2084 goto out;
2085 }
2086 }
2087
2088 list_for_each_entry(r, &dep->started_list, list) {
2089 if (r == req) {
2090 struct dwc3_request *t;
2091
2092 /* wait until it is processed */
2093 dwc3_stop_active_transfer(dep, true, true);
2094
2095 /*
2096 * Remove any started request if the transfer is
2097 * cancelled.
2098 */
2099 list_for_each_entry_safe(r, t, &dep->started_list, list)
2100 dwc3_gadget_move_cancelled_request(r,
2101 DWC3_REQUEST_STATUS_DEQUEUED);
2102
2103 dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
2104
2105 goto out;
2106 }
2107 }
2108
2109 dev_err(dwc->dev, "request %pK was not queued to %s\n",
2110 request, ep->name);
2111 ret = -EINVAL;
2112out:
2113 spin_unlock_irqrestore(&dwc->lock, flags);
2114
2115 return ret;
2116}
2117
2118int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
2119{
2120 struct dwc3_gadget_ep_cmd_params params;
2121 struct dwc3 *dwc = dep->dwc;
2122 struct dwc3_request *req;
2123 struct dwc3_request *tmp;
2124 int ret;
2125
2126 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2127 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
2128 return -EINVAL;
2129 }
2130
2131 memset(¶ms, 0x00, sizeof(params));
2132
2133 if (value) {
2134 struct dwc3_trb *trb;
2135
2136 unsigned int transfer_in_flight;
2137 unsigned int started;
2138
2139 if (dep->number > 1)
2140 trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
2141 else
2142 trb = &dwc->ep0_trb[dep->trb_enqueue];
2143
2144 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
2145 started = !list_empty(&dep->started_list);
2146
2147 if (!protocol && ((dep->direction && transfer_in_flight) ||
2148 (!dep->direction && started))) {
2149 return -EAGAIN;
2150 }
2151
2152 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
2153 ¶ms);
2154 if (ret)
2155 dev_err(dwc->dev, "failed to set STALL on %s\n",
2156 dep->name);
2157 else
2158 dep->flags |= DWC3_EP_STALL;
2159 } else {
2160 /*
2161 * Don't issue CLEAR_STALL command to control endpoints. The
2162 * controller automatically clears the STALL when it receives
2163 * the SETUP token.
2164 */
2165 if (dep->number <= 1) {
2166 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
2167 return 0;
2168 }
2169
2170 dwc3_stop_active_transfer(dep, true, true);
2171
2172 list_for_each_entry_safe(req, tmp, &dep->started_list, list)
2173 dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_STALLED);
2174
2175 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING ||
2176 (dep->flags & DWC3_EP_DELAY_STOP)) {
2177 dep->flags |= DWC3_EP_PENDING_CLEAR_STALL;
2178 if (protocol)
2179 dwc->clear_stall_protocol = dep->number;
2180
2181 return 0;
2182 }
2183
2184 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
2185
2186 ret = dwc3_send_clear_stall_ep_cmd(dep);
2187 if (ret) {
2188 dev_err(dwc->dev, "failed to clear STALL on %s\n",
2189 dep->name);
2190 return ret;
2191 }
2192
2193 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
2194
2195 if ((dep->flags & DWC3_EP_DELAY_START) &&
2196 !usb_endpoint_xfer_isoc(dep->endpoint.desc))
2197 __dwc3_gadget_kick_transfer(dep);
2198
2199 dep->flags &= ~DWC3_EP_DELAY_START;
2200 }
2201
2202 return ret;
2203}
2204
2205static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
2206{
2207 struct dwc3_ep *dep = to_dwc3_ep(ep);
2208 struct dwc3 *dwc = dep->dwc;
2209
2210 unsigned long flags;
2211
2212 int ret;
2213
2214 spin_lock_irqsave(&dwc->lock, flags);
2215 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
2216 spin_unlock_irqrestore(&dwc->lock, flags);
2217
2218 return ret;
2219}
2220
2221static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
2222{
2223 struct dwc3_ep *dep = to_dwc3_ep(ep);
2224 struct dwc3 *dwc = dep->dwc;
2225 unsigned long flags;
2226 int ret;
2227
2228 spin_lock_irqsave(&dwc->lock, flags);
2229 dep->flags |= DWC3_EP_WEDGE;
2230
2231 if (dep->number == 0 || dep->number == 1)
2232 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
2233 else
2234 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
2235 spin_unlock_irqrestore(&dwc->lock, flags);
2236
2237 return ret;
2238}
2239
2240/* -------------------------------------------------------------------------- */
2241
2242static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
2243 .bLength = USB_DT_ENDPOINT_SIZE,
2244 .bDescriptorType = USB_DT_ENDPOINT,
2245 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
2246};
2247
2248static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
2249 .enable = dwc3_gadget_ep0_enable,
2250 .disable = dwc3_gadget_ep0_disable,
2251 .alloc_request = dwc3_gadget_ep_alloc_request,
2252 .free_request = dwc3_gadget_ep_free_request,
2253 .queue = dwc3_gadget_ep0_queue,
2254 .dequeue = dwc3_gadget_ep_dequeue,
2255 .set_halt = dwc3_gadget_ep0_set_halt,
2256 .set_wedge = dwc3_gadget_ep_set_wedge,
2257};
2258
2259static const struct usb_ep_ops dwc3_gadget_ep_ops = {
2260 .enable = dwc3_gadget_ep_enable,
2261 .disable = dwc3_gadget_ep_disable,
2262 .alloc_request = dwc3_gadget_ep_alloc_request,
2263 .free_request = dwc3_gadget_ep_free_request,
2264 .queue = dwc3_gadget_ep_queue,
2265 .dequeue = dwc3_gadget_ep_dequeue,
2266 .set_halt = dwc3_gadget_ep_set_halt,
2267 .set_wedge = dwc3_gadget_ep_set_wedge,
2268};
2269
2270/* -------------------------------------------------------------------------- */
2271
2272static int dwc3_gadget_get_frame(struct usb_gadget *g)
2273{
2274 struct dwc3 *dwc = gadget_to_dwc(g);
2275
2276 return __dwc3_gadget_get_frame(dwc);
2277}
2278
2279static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
2280{
2281 int retries;
2282
2283 int ret;
2284 u32 reg;
2285
2286 u8 link_state;
2287
2288 /*
2289 * According to the Databook Remote wakeup request should
2290 * be issued only when the device is in early suspend state.
2291 *
2292 * We can check that via USB Link State bits in DSTS register.
2293 */
2294 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2295
2296 link_state = DWC3_DSTS_USBLNKST(reg);
2297
2298 switch (link_state) {
2299 case DWC3_LINK_STATE_RESET:
2300 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
2301 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
2302 case DWC3_LINK_STATE_U2: /* in HS, means Sleep (L1) */
2303 case DWC3_LINK_STATE_U1:
2304 case DWC3_LINK_STATE_RESUME:
2305 break;
2306 default:
2307 return -EINVAL;
2308 }
2309
2310 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
2311 if (ret < 0) {
2312 dev_err(dwc->dev, "failed to put link in Recovery\n");
2313 return ret;
2314 }
2315
2316 /* Recent versions do this automatically */
2317 if (DWC3_VER_IS_PRIOR(DWC3, 194A)) {
2318 /* write zeroes to Link Change Request */
2319 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2320 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
2321 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2322 }
2323
2324 /* poll until Link State changes to ON */
2325 retries = 20000;
2326
2327 while (retries--) {
2328 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2329
2330 /* in HS, means ON */
2331 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
2332 break;
2333 }
2334
2335 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
2336 dev_err(dwc->dev, "failed to send remote wakeup\n");
2337 return -EINVAL;
2338 }
2339
2340 return 0;
2341}
2342
2343static int dwc3_gadget_wakeup(struct usb_gadget *g)
2344{
2345 struct dwc3 *dwc = gadget_to_dwc(g);
2346 unsigned long flags;
2347 int ret;
2348
2349 spin_lock_irqsave(&dwc->lock, flags);
2350 ret = __dwc3_gadget_wakeup(dwc);
2351 spin_unlock_irqrestore(&dwc->lock, flags);
2352
2353 return ret;
2354}
2355
2356static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
2357 int is_selfpowered)
2358{
2359 struct dwc3 *dwc = gadget_to_dwc(g);
2360 unsigned long flags;
2361
2362 spin_lock_irqsave(&dwc->lock, flags);
2363 g->is_selfpowered = !!is_selfpowered;
2364 spin_unlock_irqrestore(&dwc->lock, flags);
2365
2366 return 0;
2367}
2368
2369static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2370{
2371 u32 epnum;
2372
2373 for (epnum = 2; epnum < dwc->num_eps; epnum++) {
2374 struct dwc3_ep *dep;
2375
2376 dep = dwc->eps[epnum];
2377 if (!dep)
2378 continue;
2379
2380 dwc3_remove_requests(dwc, dep, -ESHUTDOWN);
2381 }
2382}
2383
2384static void __dwc3_gadget_set_ssp_rate(struct dwc3 *dwc)
2385{
2386 enum usb_ssp_rate ssp_rate = dwc->gadget_ssp_rate;
2387 u32 reg;
2388
2389 if (ssp_rate == USB_SSP_GEN_UNKNOWN)
2390 ssp_rate = dwc->max_ssp_rate;
2391
2392 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2393 reg &= ~DWC3_DCFG_SPEED_MASK;
2394 reg &= ~DWC3_DCFG_NUMLANES(~0);
2395
2396 if (ssp_rate == USB_SSP_GEN_1x2)
2397 reg |= DWC3_DCFG_SUPERSPEED;
2398 else if (dwc->max_ssp_rate != USB_SSP_GEN_1x2)
2399 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2400
2401 if (ssp_rate != USB_SSP_GEN_2x1 &&
2402 dwc->max_ssp_rate != USB_SSP_GEN_2x1)
2403 reg |= DWC3_DCFG_NUMLANES(1);
2404
2405 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2406}
2407
2408static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
2409{
2410 enum usb_device_speed speed;
2411 u32 reg;
2412
2413 speed = dwc->gadget_max_speed;
2414 if (speed == USB_SPEED_UNKNOWN || speed > dwc->maximum_speed)
2415 speed = dwc->maximum_speed;
2416
2417 if (speed == USB_SPEED_SUPER_PLUS &&
2418 DWC3_IP_IS(DWC32)) {
2419 __dwc3_gadget_set_ssp_rate(dwc);
2420 return;
2421 }
2422
2423 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2424 reg &= ~(DWC3_DCFG_SPEED_MASK);
2425
2426 /*
2427 * WORKAROUND: DWC3 revision < 2.20a have an issue
2428 * which would cause metastability state on Run/Stop
2429 * bit if we try to force the IP to USB2-only mode.
2430 *
2431 * Because of that, we cannot configure the IP to any
2432 * speed other than the SuperSpeed
2433 *
2434 * Refers to:
2435 *
2436 * STAR#9000525659: Clock Domain Crossing on DCTL in
2437 * USB 2.0 Mode
2438 */
2439 if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
2440 !dwc->dis_metastability_quirk) {
2441 reg |= DWC3_DCFG_SUPERSPEED;
2442 } else {
2443 switch (speed) {
2444 case USB_SPEED_FULL:
2445 reg |= DWC3_DCFG_FULLSPEED;
2446 break;
2447 case USB_SPEED_HIGH:
2448 reg |= DWC3_DCFG_HIGHSPEED;
2449 break;
2450 case USB_SPEED_SUPER:
2451 reg |= DWC3_DCFG_SUPERSPEED;
2452 break;
2453 case USB_SPEED_SUPER_PLUS:
2454 if (DWC3_IP_IS(DWC3))
2455 reg |= DWC3_DCFG_SUPERSPEED;
2456 else
2457 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2458 break;
2459 default:
2460 dev_err(dwc->dev, "invalid speed (%d)\n", speed);
2461
2462 if (DWC3_IP_IS(DWC3))
2463 reg |= DWC3_DCFG_SUPERSPEED;
2464 else
2465 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2466 }
2467 }
2468
2469 if (DWC3_IP_IS(DWC32) &&
2470 speed > USB_SPEED_UNKNOWN &&
2471 speed < USB_SPEED_SUPER_PLUS)
2472 reg &= ~DWC3_DCFG_NUMLANES(~0);
2473
2474 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2475}
2476
2477static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
2478{
2479 u32 reg;
2480 u32 timeout = 2000;
2481
2482 if (pm_runtime_suspended(dwc->dev))
2483 return 0;
2484
2485 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2486 if (is_on) {
2487 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 187A)) {
2488 reg &= ~DWC3_DCTL_TRGTULST_MASK;
2489 reg |= DWC3_DCTL_TRGTULST_RX_DET;
2490 }
2491
2492 if (!DWC3_VER_IS_PRIOR(DWC3, 194A))
2493 reg &= ~DWC3_DCTL_KEEP_CONNECT;
2494 reg |= DWC3_DCTL_RUN_STOP;
2495
2496 if (dwc->has_hibernation)
2497 reg |= DWC3_DCTL_KEEP_CONNECT;
2498
2499 __dwc3_gadget_set_speed(dwc);
2500 dwc->pullups_connected = true;
2501 } else {
2502 reg &= ~DWC3_DCTL_RUN_STOP;
2503
2504 if (dwc->has_hibernation && !suspend)
2505 reg &= ~DWC3_DCTL_KEEP_CONNECT;
2506
2507 dwc->pullups_connected = false;
2508 }
2509
2510 dwc3_gadget_dctl_write_safe(dwc, reg);
2511
2512 do {
2513 usleep_range(1000, 2000);
2514 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2515 reg &= DWC3_DSTS_DEVCTRLHLT;
2516 } while (--timeout && !(!is_on ^ !reg));
2517
2518 if (!timeout)
2519 return -ETIMEDOUT;
2520
2521 return 0;
2522}
2523
2524static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
2525static void __dwc3_gadget_stop(struct dwc3 *dwc);
2526static int __dwc3_gadget_start(struct dwc3 *dwc);
2527
2528static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc)
2529{
2530 unsigned long flags;
2531
2532 spin_lock_irqsave(&dwc->lock, flags);
2533 dwc->connected = false;
2534
2535 /*
2536 * Per databook, when we want to stop the gadget, if a control transfer
2537 * is still in process, complete it and get the core into setup phase.
2538 */
2539 if (dwc->ep0state != EP0_SETUP_PHASE) {
2540 int ret;
2541
2542 if (dwc->delayed_status)
2543 dwc3_ep0_send_delayed_status(dwc);
2544
2545 reinit_completion(&dwc->ep0_in_setup);
2546
2547 spin_unlock_irqrestore(&dwc->lock, flags);
2548 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
2549 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
2550 spin_lock_irqsave(&dwc->lock, flags);
2551 if (ret == 0)
2552 dev_warn(dwc->dev, "timed out waiting for SETUP phase\n");
2553 }
2554
2555 /*
2556 * In the Synopsys DesignWare Cores USB3 Databook Rev. 3.30a
2557 * Section 4.1.8 Table 4-7, it states that for a device-initiated
2558 * disconnect, the SW needs to ensure that it sends "a DEPENDXFER
2559 * command for any active transfers" before clearing the RunStop
2560 * bit.
2561 */
2562 dwc3_stop_active_transfers(dwc);
2563 __dwc3_gadget_stop(dwc);
2564 spin_unlock_irqrestore(&dwc->lock, flags);
2565
2566 /*
2567 * Note: if the GEVNTCOUNT indicates events in the event buffer, the
2568 * driver needs to acknowledge them before the controller can halt.
2569 * Simply let the interrupt handler acknowledges and handle the
2570 * remaining event generated by the controller while polling for
2571 * DSTS.DEVCTLHLT.
2572 */
2573 return dwc3_gadget_run_stop(dwc, false, false);
2574}
2575
2576static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
2577{
2578 struct dwc3 *dwc = gadget_to_dwc(g);
2579 int ret;
2580
2581 is_on = !!is_on;
2582
2583 dwc->softconnect = is_on;
2584
2585 /*
2586 * Avoid issuing a runtime resume if the device is already in the
2587 * suspended state during gadget disconnect. DWC3 gadget was already
2588 * halted/stopped during runtime suspend.
2589 */
2590 if (!is_on) {
2591 pm_runtime_barrier(dwc->dev);
2592 if (pm_runtime_suspended(dwc->dev))
2593 return 0;
2594 }
2595
2596 /*
2597 * Check the return value for successful resume, or error. For a
2598 * successful resume, the DWC3 runtime PM resume routine will handle
2599 * the run stop sequence, so avoid duplicate operations here.
2600 */
2601 ret = pm_runtime_get_sync(dwc->dev);
2602 if (!ret || ret < 0) {
2603 pm_runtime_put(dwc->dev);
2604 return 0;
2605 }
2606
2607 if (dwc->pullups_connected == is_on) {
2608 pm_runtime_put(dwc->dev);
2609 return 0;
2610 }
2611
2612 synchronize_irq(dwc->irq_gadget);
2613
2614 if (!is_on) {
2615 ret = dwc3_gadget_soft_disconnect(dwc);
2616 } else {
2617 /*
2618 * In the Synopsys DWC_usb31 1.90a programming guide section
2619 * 4.1.9, it specifies that for a reconnect after a
2620 * device-initiated disconnect requires a core soft reset
2621 * (DCTL.CSftRst) before enabling the run/stop bit.
2622 */
2623 dwc3_core_soft_reset(dwc);
2624
2625 dwc3_event_buffers_setup(dwc);
2626 __dwc3_gadget_start(dwc);
2627 ret = dwc3_gadget_run_stop(dwc, true, false);
2628 }
2629
2630 pm_runtime_put(dwc->dev);
2631
2632 return ret;
2633}
2634
2635static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
2636{
2637 u32 reg;
2638
2639 /* Enable all but Start and End of Frame IRQs */
2640 reg = (DWC3_DEVTEN_EVNTOVERFLOWEN |
2641 DWC3_DEVTEN_CMDCMPLTEN |
2642 DWC3_DEVTEN_ERRTICERREN |
2643 DWC3_DEVTEN_WKUPEVTEN |
2644 DWC3_DEVTEN_CONNECTDONEEN |
2645 DWC3_DEVTEN_USBRSTEN |
2646 DWC3_DEVTEN_DISCONNEVTEN);
2647
2648 if (DWC3_VER_IS_PRIOR(DWC3, 250A))
2649 reg |= DWC3_DEVTEN_ULSTCNGEN;
2650
2651 /* On 2.30a and above this bit enables U3/L2-L1 Suspend Events */
2652 if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
2653 reg |= DWC3_DEVTEN_U3L2L1SUSPEN;
2654
2655 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2656}
2657
2658static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
2659{
2660 /* mask all interrupts */
2661 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2662}
2663
2664static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
2665static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
2666
2667/**
2668 * dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
2669 * @dwc: pointer to our context structure
2670 *
2671 * The following looks like complex but it's actually very simple. In order to
2672 * calculate the number of packets we can burst at once on OUT transfers, we're
2673 * gonna use RxFIFO size.
2674 *
2675 * To calculate RxFIFO size we need two numbers:
2676 * MDWIDTH = size, in bits, of the internal memory bus
2677 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
2678 *
2679 * Given these two numbers, the formula is simple:
2680 *
2681 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
2682 *
2683 * 24 bytes is for 3x SETUP packets
2684 * 16 bytes is a clock domain crossing tolerance
2685 *
2686 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
2687 */
2688static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
2689{
2690 u32 ram2_depth;
2691 u32 mdwidth;
2692 u32 nump;
2693 u32 reg;
2694
2695 ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
2696 mdwidth = dwc3_mdwidth(dwc);
2697
2698 nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
2699 nump = min_t(u32, nump, 16);
2700
2701 /* update NumP */
2702 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2703 reg &= ~DWC3_DCFG_NUMP_MASK;
2704 reg |= nump << DWC3_DCFG_NUMP_SHIFT;
2705 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2706}
2707
2708static int __dwc3_gadget_start(struct dwc3 *dwc)
2709{
2710 struct dwc3_ep *dep;
2711 int ret = 0;
2712 u32 reg;
2713
2714 /*
2715 * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
2716 * the core supports IMOD, disable it.
2717 */
2718 if (dwc->imod_interval) {
2719 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
2720 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
2721 } else if (dwc3_has_imod(dwc)) {
2722 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
2723 }
2724
2725 /*
2726 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
2727 * field instead of letting dwc3 itself calculate that automatically.
2728 *
2729 * This way, we maximize the chances that we'll be able to get several
2730 * bursts of data without going through any sort of endpoint throttling.
2731 */
2732 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
2733 if (DWC3_IP_IS(DWC3))
2734 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
2735 else
2736 reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;
2737
2738 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
2739
2740 dwc3_gadget_setup_nump(dwc);
2741
2742 /*
2743 * Currently the controller handles single stream only. So, Ignore
2744 * Packet Pending bit for stream selection and don't search for another
2745 * stream if the host sends Data Packet with PP=0 (for OUT direction) or
2746 * ACK with NumP=0 and PP=0 (for IN direction). This slightly improves
2747 * the stream performance.
2748 */
2749 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2750 reg |= DWC3_DCFG_IGNSTRMPP;
2751 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2752
2753 /* Enable MST by default if the device is capable of MST */
2754 if (DWC3_MST_CAPABLE(&dwc->hwparams)) {
2755 reg = dwc3_readl(dwc->regs, DWC3_DCFG1);
2756 reg &= ~DWC3_DCFG1_DIS_MST_ENH;
2757 dwc3_writel(dwc->regs, DWC3_DCFG1, reg);
2758 }
2759
2760 /* Start with SuperSpeed Default */
2761 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2762
2763 dep = dwc->eps[0];
2764 dep->flags = 0;
2765 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
2766 if (ret) {
2767 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2768 goto err0;
2769 }
2770
2771 dep = dwc->eps[1];
2772 dep->flags = 0;
2773 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
2774 if (ret) {
2775 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2776 goto err1;
2777 }
2778
2779 /* begin to receive SETUP packets */
2780 dwc->ep0state = EP0_SETUP_PHASE;
2781 dwc->ep0_bounced = false;
2782 dwc->link_state = DWC3_LINK_STATE_SS_DIS;
2783 dwc->delayed_status = false;
2784 dwc3_ep0_out_start(dwc);
2785
2786 dwc3_gadget_enable_irq(dwc);
2787
2788 return 0;
2789
2790err1:
2791 __dwc3_gadget_ep_disable(dwc->eps[0]);
2792
2793err0:
2794 return ret;
2795}
2796
2797static int dwc3_gadget_start(struct usb_gadget *g,
2798 struct usb_gadget_driver *driver)
2799{
2800 struct dwc3 *dwc = gadget_to_dwc(g);
2801 unsigned long flags;
2802 int ret;
2803 int irq;
2804
2805 irq = dwc->irq_gadget;
2806 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
2807 IRQF_SHARED, "dwc3", dwc->ev_buf);
2808 if (ret) {
2809 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2810 irq, ret);
2811 return ret;
2812 }
2813
2814 spin_lock_irqsave(&dwc->lock, flags);
2815 dwc->gadget_driver = driver;
2816 spin_unlock_irqrestore(&dwc->lock, flags);
2817
2818 return 0;
2819}
2820
2821static void __dwc3_gadget_stop(struct dwc3 *dwc)
2822{
2823 dwc3_gadget_disable_irq(dwc);
2824 __dwc3_gadget_ep_disable(dwc->eps[0]);
2825 __dwc3_gadget_ep_disable(dwc->eps[1]);
2826}
2827
2828static int dwc3_gadget_stop(struct usb_gadget *g)
2829{
2830 struct dwc3 *dwc = gadget_to_dwc(g);
2831 unsigned long flags;
2832
2833 spin_lock_irqsave(&dwc->lock, flags);
2834 dwc->gadget_driver = NULL;
2835 dwc->max_cfg_eps = 0;
2836 spin_unlock_irqrestore(&dwc->lock, flags);
2837
2838 free_irq(dwc->irq_gadget, dwc->ev_buf);
2839
2840 return 0;
2841}
2842
2843static void dwc3_gadget_config_params(struct usb_gadget *g,
2844 struct usb_dcd_config_params *params)
2845{
2846 struct dwc3 *dwc = gadget_to_dwc(g);
2847
2848 params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
2849 params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;
2850
2851 /* Recommended BESL */
2852 if (!dwc->dis_enblslpm_quirk) {
2853 /*
2854 * If the recommended BESL baseline is 0 or if the BESL deep is
2855 * less than 2, Microsoft's Windows 10 host usb stack will issue
2856 * a usb reset immediately after it receives the extended BOS
2857 * descriptor and the enumeration will fail. To maintain
2858 * compatibility with the Windows' usb stack, let's set the
2859 * recommended BESL baseline to 1 and clamp the BESL deep to be
2860 * within 2 to 15.
2861 */
2862 params->besl_baseline = 1;
2863 if (dwc->is_utmi_l1_suspend)
2864 params->besl_deep =
2865 clamp_t(u8, dwc->hird_threshold, 2, 15);
2866 }
2867
2868 /* U1 Device exit Latency */
2869 if (dwc->dis_u1_entry_quirk)
2870 params->bU1devExitLat = 0;
2871 else
2872 params->bU1devExitLat = DWC3_DEFAULT_U1_DEV_EXIT_LAT;
2873
2874 /* U2 Device exit Latency */
2875 if (dwc->dis_u2_entry_quirk)
2876 params->bU2DevExitLat = 0;
2877 else
2878 params->bU2DevExitLat =
2879 cpu_to_le16(DWC3_DEFAULT_U2_DEV_EXIT_LAT);
2880}
2881
2882static void dwc3_gadget_set_speed(struct usb_gadget *g,
2883 enum usb_device_speed speed)
2884{
2885 struct dwc3 *dwc = gadget_to_dwc(g);
2886 unsigned long flags;
2887
2888 spin_lock_irqsave(&dwc->lock, flags);
2889 dwc->gadget_max_speed = speed;
2890 spin_unlock_irqrestore(&dwc->lock, flags);
2891}
2892
2893static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
2894 enum usb_ssp_rate rate)
2895{
2896 struct dwc3 *dwc = gadget_to_dwc(g);
2897 unsigned long flags;
2898
2899 spin_lock_irqsave(&dwc->lock, flags);
2900 dwc->gadget_max_speed = USB_SPEED_SUPER_PLUS;
2901 dwc->gadget_ssp_rate = rate;
2902 spin_unlock_irqrestore(&dwc->lock, flags);
2903}
2904
2905static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
2906{
2907 struct dwc3 *dwc = gadget_to_dwc(g);
2908 union power_supply_propval val = {0};
2909 int ret;
2910
2911 if (dwc->usb2_phy)
2912 return usb_phy_set_power(dwc->usb2_phy, mA);
2913
2914 if (!dwc->usb_psy)
2915 return -EOPNOTSUPP;
2916
2917 val.intval = 1000 * mA;
2918 ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
2919
2920 return ret;
2921}
2922
2923/**
2924 * dwc3_gadget_check_config - ensure dwc3 can support the USB configuration
2925 * @g: pointer to the USB gadget
2926 *
2927 * Used to record the maximum number of endpoints being used in a USB composite
2928 * device. (across all configurations) This is to be used in the calculation
2929 * of the TXFIFO sizes when resizing internal memory for individual endpoints.
2930 * It will help ensured that the resizing logic reserves enough space for at
2931 * least one max packet.
2932 */
2933static int dwc3_gadget_check_config(struct usb_gadget *g)
2934{
2935 struct dwc3 *dwc = gadget_to_dwc(g);
2936 struct usb_ep *ep;
2937 int fifo_size = 0;
2938 int ram1_depth;
2939 int ep_num = 0;
2940
2941 if (!dwc->do_fifo_resize)
2942 return 0;
2943
2944 list_for_each_entry(ep, &g->ep_list, ep_list) {
2945 /* Only interested in the IN endpoints */
2946 if (ep->claimed && (ep->address & USB_DIR_IN))
2947 ep_num++;
2948 }
2949
2950 if (ep_num <= dwc->max_cfg_eps)
2951 return 0;
2952
2953 /* Update the max number of eps in the composition */
2954 dwc->max_cfg_eps = ep_num;
2955
2956 fifo_size = dwc3_gadget_calc_tx_fifo_size(dwc, dwc->max_cfg_eps);
2957 /* Based on the equation, increment by one for every ep */
2958 fifo_size += dwc->max_cfg_eps;
2959
2960 /* Check if we can fit a single fifo per endpoint */
2961 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
2962 if (fifo_size > ram1_depth)
2963 return -ENOMEM;
2964
2965 return 0;
2966}
2967
2968static void dwc3_gadget_async_callbacks(struct usb_gadget *g, bool enable)
2969{
2970 struct dwc3 *dwc = gadget_to_dwc(g);
2971 unsigned long flags;
2972
2973 spin_lock_irqsave(&dwc->lock, flags);
2974 dwc->async_callbacks = enable;
2975 spin_unlock_irqrestore(&dwc->lock, flags);
2976}
2977
2978static const struct usb_gadget_ops dwc3_gadget_ops = {
2979 .get_frame = dwc3_gadget_get_frame,
2980 .wakeup = dwc3_gadget_wakeup,
2981 .set_selfpowered = dwc3_gadget_set_selfpowered,
2982 .pullup = dwc3_gadget_pullup,
2983 .udc_start = dwc3_gadget_start,
2984 .udc_stop = dwc3_gadget_stop,
2985 .udc_set_speed = dwc3_gadget_set_speed,
2986 .udc_set_ssp_rate = dwc3_gadget_set_ssp_rate,
2987 .get_config_params = dwc3_gadget_config_params,
2988 .vbus_draw = dwc3_gadget_vbus_draw,
2989 .check_config = dwc3_gadget_check_config,
2990 .udc_async_callbacks = dwc3_gadget_async_callbacks,
2991};
2992
2993/* -------------------------------------------------------------------------- */
2994
2995static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
2996{
2997 struct dwc3 *dwc = dep->dwc;
2998
2999 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
3000 dep->endpoint.maxburst = 1;
3001 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
3002 if (!dep->direction)
3003 dwc->gadget->ep0 = &dep->endpoint;
3004
3005 dep->endpoint.caps.type_control = true;
3006
3007 return 0;
3008}
3009
3010static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
3011{
3012 struct dwc3 *dwc = dep->dwc;
3013 u32 mdwidth;
3014 int size;
3015 int maxpacket;
3016
3017 mdwidth = dwc3_mdwidth(dwc);
3018
3019 /* MDWIDTH is represented in bits, we need it in bytes */
3020 mdwidth /= 8;
3021
3022 size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
3023 if (DWC3_IP_IS(DWC3))
3024 size = DWC3_GTXFIFOSIZ_TXFDEP(size);
3025 else
3026 size = DWC31_GTXFIFOSIZ_TXFDEP(size);
3027
3028 /*
3029 * maxpacket size is determined as part of the following, after assuming
3030 * a mult value of one maxpacket:
3031 * DWC3 revision 280A and prior:
3032 * fifo_size = mult * (max_packet / mdwidth) + 1;
3033 * maxpacket = mdwidth * (fifo_size - 1);
3034 *
3035 * DWC3 revision 290A and onwards:
3036 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
3037 * maxpacket = mdwidth * ((fifo_size - 1) - 1) - mdwidth;
3038 */
3039 if (DWC3_VER_IS_PRIOR(DWC3, 290A))
3040 maxpacket = mdwidth * (size - 1);
3041 else
3042 maxpacket = mdwidth * ((size - 1) - 1) - mdwidth;
3043
3044 /* Functionally, space for one max packet is sufficient */
3045 size = min_t(int, maxpacket, 1024);
3046 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
3047
3048 dep->endpoint.max_streams = 16;
3049 dep->endpoint.ops = &dwc3_gadget_ep_ops;
3050 list_add_tail(&dep->endpoint.ep_list,
3051 &dwc->gadget->ep_list);
3052 dep->endpoint.caps.type_iso = true;
3053 dep->endpoint.caps.type_bulk = true;
3054 dep->endpoint.caps.type_int = true;
3055
3056 return dwc3_alloc_trb_pool(dep);
3057}
3058
3059static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
3060{
3061 struct dwc3 *dwc = dep->dwc;
3062 u32 mdwidth;
3063 int size;
3064
3065 mdwidth = dwc3_mdwidth(dwc);
3066
3067 /* MDWIDTH is represented in bits, convert to bytes */
3068 mdwidth /= 8;
3069
3070 /* All OUT endpoints share a single RxFIFO space */
3071 size = dwc3_readl(dwc->regs, DWC3_GRXFIFOSIZ(0));
3072 if (DWC3_IP_IS(DWC3))
3073 size = DWC3_GRXFIFOSIZ_RXFDEP(size);
3074 else
3075 size = DWC31_GRXFIFOSIZ_RXFDEP(size);
3076
3077 /* FIFO depth is in MDWDITH bytes */
3078 size *= mdwidth;
3079
3080 /*
3081 * To meet performance requirement, a minimum recommended RxFIFO size
3082 * is defined as follow:
3083 * RxFIFO size >= (3 x MaxPacketSize) +
3084 * (3 x 8 bytes setup packets size) + (16 bytes clock crossing margin)
3085 *
3086 * Then calculate the max packet limit as below.
3087 */
3088 size -= (3 * 8) + 16;
3089 if (size < 0)
3090 size = 0;
3091 else
3092 size /= 3;
3093
3094 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
3095 dep->endpoint.max_streams = 16;
3096 dep->endpoint.ops = &dwc3_gadget_ep_ops;
3097 list_add_tail(&dep->endpoint.ep_list,
3098 &dwc->gadget->ep_list);
3099 dep->endpoint.caps.type_iso = true;
3100 dep->endpoint.caps.type_bulk = true;
3101 dep->endpoint.caps.type_int = true;
3102
3103 return dwc3_alloc_trb_pool(dep);
3104}
3105
3106static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
3107{
3108 struct dwc3_ep *dep;
3109 bool direction = epnum & 1;
3110 int ret;
3111 u8 num = epnum >> 1;
3112
3113 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
3114 if (!dep)
3115 return -ENOMEM;
3116
3117 dep->dwc = dwc;
3118 dep->number = epnum;
3119 dep->direction = direction;
3120 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
3121 dwc->eps[epnum] = dep;
3122 dep->combo_num = 0;
3123 dep->start_cmd_status = 0;
3124
3125 snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
3126 direction ? "in" : "out");
3127
3128 dep->endpoint.name = dep->name;
3129
3130 if (!(dep->number > 1)) {
3131 dep->endpoint.desc = &dwc3_gadget_ep0_desc;
3132 dep->endpoint.comp_desc = NULL;
3133 }
3134
3135 if (num == 0)
3136 ret = dwc3_gadget_init_control_endpoint(dep);
3137 else if (direction)
3138 ret = dwc3_gadget_init_in_endpoint(dep);
3139 else
3140 ret = dwc3_gadget_init_out_endpoint(dep);
3141
3142 if (ret)
3143 return ret;
3144
3145 dep->endpoint.caps.dir_in = direction;
3146 dep->endpoint.caps.dir_out = !direction;
3147
3148 INIT_LIST_HEAD(&dep->pending_list);
3149 INIT_LIST_HEAD(&dep->started_list);
3150 INIT_LIST_HEAD(&dep->cancelled_list);
3151
3152 dwc3_debugfs_create_endpoint_dir(dep);
3153
3154 return 0;
3155}
3156
3157static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
3158{
3159 u8 epnum;
3160
3161 INIT_LIST_HEAD(&dwc->gadget->ep_list);
3162
3163 for (epnum = 0; epnum < total; epnum++) {
3164 int ret;
3165
3166 ret = dwc3_gadget_init_endpoint(dwc, epnum);
3167 if (ret)
3168 return ret;
3169 }
3170
3171 return 0;
3172}
3173
3174static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
3175{
3176 struct dwc3_ep *dep;
3177 u8 epnum;
3178
3179 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
3180 dep = dwc->eps[epnum];
3181 if (!dep)
3182 continue;
3183 /*
3184 * Physical endpoints 0 and 1 are special; they form the
3185 * bi-directional USB endpoint 0.
3186 *
3187 * For those two physical endpoints, we don't allocate a TRB
3188 * pool nor do we add them the endpoints list. Due to that, we
3189 * shouldn't do these two operations otherwise we would end up
3190 * with all sorts of bugs when removing dwc3.ko.
3191 */
3192 if (epnum != 0 && epnum != 1) {
3193 dwc3_free_trb_pool(dep);
3194 list_del(&dep->endpoint.ep_list);
3195 }
3196
3197 debugfs_remove_recursive(debugfs_lookup(dep->name,
3198 debugfs_lookup(dev_name(dep->dwc->dev),
3199 usb_debug_root)));
3200 kfree(dep);
3201 }
3202}
3203
3204/* -------------------------------------------------------------------------- */
3205
3206static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
3207 struct dwc3_request *req, struct dwc3_trb *trb,
3208 const struct dwc3_event_depevt *event, int status, int chain)
3209{
3210 unsigned int count;
3211
3212 dwc3_ep_inc_deq(dep);
3213
3214 trace_dwc3_complete_trb(dep, trb);
3215 req->num_trbs--;
3216
3217 /*
3218 * If we're in the middle of series of chained TRBs and we
3219 * receive a short transfer along the way, DWC3 will skip
3220 * through all TRBs including the last TRB in the chain (the
3221 * where CHN bit is zero. DWC3 will also avoid clearing HWO
3222 * bit and SW has to do it manually.
3223 *
3224 * We're going to do that here to avoid problems of HW trying
3225 * to use bogus TRBs for transfers.
3226 */
3227 if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
3228 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
3229
3230 /*
3231 * For isochronous transfers, the first TRB in a service interval must
3232 * have the Isoc-First type. Track and report its interval frame number.
3233 */
3234 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
3235 (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) {
3236 unsigned int frame_number;
3237
3238 frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl);
3239 frame_number &= ~(dep->interval - 1);
3240 req->request.frame_number = frame_number;
3241 }
3242
3243 /*
3244 * We use bounce buffer for requests that needs extra TRB or OUT ZLP. If
3245 * this TRB points to the bounce buffer address, it's a MPS alignment
3246 * TRB. Don't add it to req->remaining calculation.
3247 */
3248 if (trb->bpl == lower_32_bits(dep->dwc->bounce_addr) &&
3249 trb->bph == upper_32_bits(dep->dwc->bounce_addr)) {
3250 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
3251 return 1;
3252 }
3253
3254 count = trb->size & DWC3_TRB_SIZE_MASK;
3255 req->remaining += count;
3256
3257 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
3258 return 1;
3259
3260 if (event->status & DEPEVT_STATUS_SHORT && !chain)
3261 return 1;
3262
3263 if ((trb->ctrl & DWC3_TRB_CTRL_ISP_IMI) &&
3264 DWC3_TRB_SIZE_TRBSTS(trb->size) == DWC3_TRBSTS_MISSED_ISOC)
3265 return 1;
3266
3267 if ((trb->ctrl & DWC3_TRB_CTRL_IOC) ||
3268 (trb->ctrl & DWC3_TRB_CTRL_LST))
3269 return 1;
3270
3271 return 0;
3272}
3273
3274static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
3275 struct dwc3_request *req, const struct dwc3_event_depevt *event,
3276 int status)
3277{
3278 struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
3279 struct scatterlist *sg = req->sg;
3280 struct scatterlist *s;
3281 unsigned int num_queued = req->num_queued_sgs;
3282 unsigned int i;
3283 int ret = 0;
3284
3285 for_each_sg(sg, s, num_queued, i) {
3286 trb = &dep->trb_pool[dep->trb_dequeue];
3287
3288 req->sg = sg_next(s);
3289 req->num_queued_sgs--;
3290
3291 ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
3292 trb, event, status, true);
3293 if (ret)
3294 break;
3295 }
3296
3297 return ret;
3298}
3299
3300static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
3301 struct dwc3_request *req, const struct dwc3_event_depevt *event,
3302 int status)
3303{
3304 struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
3305
3306 return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
3307 event, status, false);
3308}
3309
3310static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
3311{
3312 return req->num_pending_sgs == 0 && req->num_queued_sgs == 0;
3313}
3314
3315static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
3316 const struct dwc3_event_depevt *event,
3317 struct dwc3_request *req, int status)
3318{
3319 int request_status;
3320 int ret;
3321
3322 if (req->request.num_mapped_sgs)
3323 ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
3324 status);
3325 else
3326 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
3327 status);
3328
3329 req->request.actual = req->request.length - req->remaining;
3330
3331 if (!dwc3_gadget_ep_request_completed(req))
3332 goto out;
3333
3334 if (req->needs_extra_trb) {
3335 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
3336 status);
3337 req->needs_extra_trb = false;
3338 }
3339
3340 /*
3341 * The event status only reflects the status of the TRB with IOC set.
3342 * For the requests that don't set interrupt on completion, the driver
3343 * needs to check and return the status of the completed TRBs associated
3344 * with the request. Use the status of the last TRB of the request.
3345 */
3346 if (req->request.no_interrupt) {
3347 struct dwc3_trb *trb;
3348
3349 trb = dwc3_ep_prev_trb(dep, dep->trb_dequeue);
3350 switch (DWC3_TRB_SIZE_TRBSTS(trb->size)) {
3351 case DWC3_TRBSTS_MISSED_ISOC:
3352 /* Isoc endpoint only */
3353 request_status = -EXDEV;
3354 break;
3355 case DWC3_TRB_STS_XFER_IN_PROG:
3356 /* Applicable when End Transfer with ForceRM=0 */
3357 case DWC3_TRBSTS_SETUP_PENDING:
3358 /* Control endpoint only */
3359 case DWC3_TRBSTS_OK:
3360 default:
3361 request_status = 0;
3362 break;
3363 }
3364 } else {
3365 request_status = status;
3366 }
3367
3368 dwc3_gadget_giveback(dep, req, request_status);
3369
3370out:
3371 return ret;
3372}
3373
3374static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
3375 const struct dwc3_event_depevt *event, int status)
3376{
3377 struct dwc3_request *req;
3378
3379 while (!list_empty(&dep->started_list)) {
3380 int ret;
3381
3382 req = next_request(&dep->started_list);
3383 ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
3384 req, status);
3385 if (ret)
3386 break;
3387 /*
3388 * The endpoint is disabled, let the dwc3_remove_requests()
3389 * handle the cleanup.
3390 */
3391 if (!dep->endpoint.desc)
3392 break;
3393 }
3394}
3395
3396static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)
3397{
3398 struct dwc3_request *req;
3399 struct dwc3 *dwc = dep->dwc;
3400
3401 if (!dep->endpoint.desc || !dwc->pullups_connected ||
3402 !dwc->connected)
3403 return false;
3404
3405 if (!list_empty(&dep->pending_list))
3406 return true;
3407
3408 /*
3409 * We only need to check the first entry of the started list. We can
3410 * assume the completed requests are removed from the started list.
3411 */
3412 req = next_request(&dep->started_list);
3413 if (!req)
3414 return false;
3415
3416 return !dwc3_gadget_ep_request_completed(req);
3417}
3418
3419static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
3420 const struct dwc3_event_depevt *event)
3421{
3422 dep->frame_number = event->parameters;
3423}
3424
3425static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
3426 const struct dwc3_event_depevt *event, int status)
3427{
3428 struct dwc3 *dwc = dep->dwc;
3429 bool no_started_trb = true;
3430
3431 dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
3432
3433 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
3434 goto out;
3435
3436 if (!dep->endpoint.desc)
3437 return no_started_trb;
3438
3439 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
3440 list_empty(&dep->started_list) &&
3441 (list_empty(&dep->pending_list) || status == -EXDEV))
3442 dwc3_stop_active_transfer(dep, true, true);
3443 else if (dwc3_gadget_ep_should_continue(dep))
3444 if (__dwc3_gadget_kick_transfer(dep) == 0)
3445 no_started_trb = false;
3446
3447out:
3448 /*
3449 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
3450 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
3451 */
3452 if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
3453 u32 reg;
3454 int i;
3455
3456 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
3457 dep = dwc->eps[i];
3458
3459 if (!(dep->flags & DWC3_EP_ENABLED))
3460 continue;
3461
3462 if (!list_empty(&dep->started_list))
3463 return no_started_trb;
3464 }
3465
3466 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3467 reg |= dwc->u1u2;
3468 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
3469
3470 dwc->u1u2 = 0;
3471 }
3472
3473 return no_started_trb;
3474}
3475
3476static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
3477 const struct dwc3_event_depevt *event)
3478{
3479 int status = 0;
3480
3481 if (!dep->endpoint.desc)
3482 return;
3483
3484 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
3485 dwc3_gadget_endpoint_frame_from_event(dep, event);
3486
3487 if (event->status & DEPEVT_STATUS_BUSERR)
3488 status = -ECONNRESET;
3489
3490 if (event->status & DEPEVT_STATUS_MISSED_ISOC)
3491 status = -EXDEV;
3492
3493 dwc3_gadget_endpoint_trbs_complete(dep, event, status);
3494}
3495
3496static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep,
3497 const struct dwc3_event_depevt *event)
3498{
3499 int status = 0;
3500
3501 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
3502
3503 if (event->status & DEPEVT_STATUS_BUSERR)
3504 status = -ECONNRESET;
3505
3506 if (dwc3_gadget_endpoint_trbs_complete(dep, event, status))
3507 dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
3508}
3509
3510static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
3511 const struct dwc3_event_depevt *event)
3512{
3513 dwc3_gadget_endpoint_frame_from_event(dep, event);
3514
3515 /*
3516 * The XferNotReady event is generated only once before the endpoint
3517 * starts. It will be generated again when END_TRANSFER command is
3518 * issued. For some controller versions, the XferNotReady event may be
3519 * generated while the END_TRANSFER command is still in process. Ignore
3520 * it and wait for the next XferNotReady event after the command is
3521 * completed.
3522 */
3523 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
3524 return;
3525
3526 (void) __dwc3_gadget_start_isoc(dep);
3527}
3528
3529static void dwc3_gadget_endpoint_command_complete(struct dwc3_ep *dep,
3530 const struct dwc3_event_depevt *event)
3531{
3532 u8 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
3533
3534 if (cmd != DWC3_DEPCMD_ENDTRANSFER)
3535 return;
3536
3537 /*
3538 * The END_TRANSFER command will cause the controller to generate a
3539 * NoStream Event, and it's not due to the host DP NoStream rejection.
3540 * Ignore the next NoStream event.
3541 */
3542 if (dep->stream_capable)
3543 dep->flags |= DWC3_EP_IGNORE_NEXT_NOSTREAM;
3544
3545 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
3546 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
3547 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
3548
3549 if (dep->flags & DWC3_EP_PENDING_CLEAR_STALL) {
3550 struct dwc3 *dwc = dep->dwc;
3551
3552 dep->flags &= ~DWC3_EP_PENDING_CLEAR_STALL;
3553 if (dwc3_send_clear_stall_ep_cmd(dep)) {
3554 struct usb_ep *ep0 = &dwc->eps[0]->endpoint;
3555
3556 dev_err(dwc->dev, "failed to clear STALL on %s\n", dep->name);
3557 if (dwc->delayed_status)
3558 __dwc3_gadget_ep0_set_halt(ep0, 1);
3559 return;
3560 }
3561
3562 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
3563 if (dwc->clear_stall_protocol == dep->number)
3564 dwc3_ep0_send_delayed_status(dwc);
3565 }
3566
3567 if ((dep->flags & DWC3_EP_DELAY_START) &&
3568 !usb_endpoint_xfer_isoc(dep->endpoint.desc))
3569 __dwc3_gadget_kick_transfer(dep);
3570
3571 dep->flags &= ~DWC3_EP_DELAY_START;
3572}
3573
3574static void dwc3_gadget_endpoint_stream_event(struct dwc3_ep *dep,
3575 const struct dwc3_event_depevt *event)
3576{
3577 struct dwc3 *dwc = dep->dwc;
3578
3579 if (event->status == DEPEVT_STREAMEVT_FOUND) {
3580 dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
3581 goto out;
3582 }
3583
3584 /* Note: NoStream rejection event param value is 0 and not 0xFFFF */
3585 switch (event->parameters) {
3586 case DEPEVT_STREAM_PRIME:
3587 /*
3588 * If the host can properly transition the endpoint state from
3589 * idle to prime after a NoStream rejection, there's no need to
3590 * force restarting the endpoint to reinitiate the stream. To
3591 * simplify the check, assume the host follows the USB spec if
3592 * it primed the endpoint more than once.
3593 */
3594 if (dep->flags & DWC3_EP_FORCE_RESTART_STREAM) {
3595 if (dep->flags & DWC3_EP_FIRST_STREAM_PRIMED)
3596 dep->flags &= ~DWC3_EP_FORCE_RESTART_STREAM;
3597 else
3598 dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
3599 }
3600
3601 break;
3602 case DEPEVT_STREAM_NOSTREAM:
3603 if ((dep->flags & DWC3_EP_IGNORE_NEXT_NOSTREAM) ||
3604 !(dep->flags & DWC3_EP_FORCE_RESTART_STREAM) ||
3605 (!DWC3_MST_CAPABLE(&dwc->hwparams) &&
3606 !(dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)))
3607 break;
3608
3609 /*
3610 * If the host rejects a stream due to no active stream, by the
3611 * USB and xHCI spec, the endpoint will be put back to idle
3612 * state. When the host is ready (buffer added/updated), it will
3613 * prime the endpoint to inform the usb device controller. This
3614 * triggers the device controller to issue ERDY to restart the
3615 * stream. However, some hosts don't follow this and keep the
3616 * endpoint in the idle state. No prime will come despite host
3617 * streams are updated, and the device controller will not be
3618 * triggered to generate ERDY to move the next stream data. To
3619 * workaround this and maintain compatibility with various
3620 * hosts, force to reinitiate the stream until the host is ready
3621 * instead of waiting for the host to prime the endpoint.
3622 */
3623 if (DWC3_VER_IS_WITHIN(DWC32, 100A, ANY)) {
3624 unsigned int cmd = DWC3_DGCMD_SET_ENDPOINT_PRIME;
3625
3626 dwc3_send_gadget_generic_command(dwc, cmd, dep->number);
3627 } else {
3628 dep->flags |= DWC3_EP_DELAY_START;
3629 dwc3_stop_active_transfer(dep, true, true);
3630 return;
3631 }
3632 break;
3633 }
3634
3635out:
3636 dep->flags &= ~DWC3_EP_IGNORE_NEXT_NOSTREAM;
3637}
3638
3639static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
3640 const struct dwc3_event_depevt *event)
3641{
3642 struct dwc3_ep *dep;
3643 u8 epnum = event->endpoint_number;
3644
3645 dep = dwc->eps[epnum];
3646
3647 if (!(dep->flags & DWC3_EP_ENABLED)) {
3648 if ((epnum > 1) && !(dep->flags & DWC3_EP_TRANSFER_STARTED))
3649 return;
3650
3651 /* Handle only EPCMDCMPLT when EP disabled */
3652 if ((event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT) &&
3653 !(epnum <= 1 && event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE))
3654 return;
3655 }
3656
3657 if (epnum == 0 || epnum == 1) {
3658 dwc3_ep0_interrupt(dwc, event);
3659 return;
3660 }
3661
3662 switch (event->endpoint_event) {
3663 case DWC3_DEPEVT_XFERINPROGRESS:
3664 dwc3_gadget_endpoint_transfer_in_progress(dep, event);
3665 break;
3666 case DWC3_DEPEVT_XFERNOTREADY:
3667 dwc3_gadget_endpoint_transfer_not_ready(dep, event);
3668 break;
3669 case DWC3_DEPEVT_EPCMDCMPLT:
3670 dwc3_gadget_endpoint_command_complete(dep, event);
3671 break;
3672 case DWC3_DEPEVT_XFERCOMPLETE:
3673 dwc3_gadget_endpoint_transfer_complete(dep, event);
3674 break;
3675 case DWC3_DEPEVT_STREAMEVT:
3676 dwc3_gadget_endpoint_stream_event(dep, event);
3677 break;
3678 case DWC3_DEPEVT_RXTXFIFOEVT:
3679 break;
3680 }
3681}
3682
3683static void dwc3_disconnect_gadget(struct dwc3 *dwc)
3684{
3685 if (dwc->async_callbacks && dwc->gadget_driver->disconnect) {
3686 spin_unlock(&dwc->lock);
3687 dwc->gadget_driver->disconnect(dwc->gadget);
3688 spin_lock(&dwc->lock);
3689 }
3690}
3691
3692static void dwc3_suspend_gadget(struct dwc3 *dwc)
3693{
3694 if (dwc->async_callbacks && dwc->gadget_driver->suspend) {
3695 spin_unlock(&dwc->lock);
3696 dwc->gadget_driver->suspend(dwc->gadget);
3697 spin_lock(&dwc->lock);
3698 }
3699}
3700
3701static void dwc3_resume_gadget(struct dwc3 *dwc)
3702{
3703 if (dwc->async_callbacks && dwc->gadget_driver->resume) {
3704 spin_unlock(&dwc->lock);
3705 dwc->gadget_driver->resume(dwc->gadget);
3706 spin_lock(&dwc->lock);
3707 }
3708}
3709
3710static void dwc3_reset_gadget(struct dwc3 *dwc)
3711{
3712 if (!dwc->gadget_driver)
3713 return;
3714
3715 if (dwc->async_callbacks && dwc->gadget->speed != USB_SPEED_UNKNOWN) {
3716 spin_unlock(&dwc->lock);
3717 usb_gadget_udc_reset(dwc->gadget, dwc->gadget_driver);
3718 spin_lock(&dwc->lock);
3719 }
3720}
3721
3722void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
3723 bool interrupt)
3724{
3725 struct dwc3 *dwc = dep->dwc;
3726
3727 /*
3728 * Only issue End Transfer command to the control endpoint of a started
3729 * Data Phase. Typically we should only do so in error cases such as
3730 * invalid/unexpected direction as described in the control transfer
3731 * flow of the programming guide.
3732 */
3733 if (dep->number <= 1 && dwc->ep0state != EP0_DATA_PHASE)
3734 return;
3735
3736 if (interrupt && (dep->flags & DWC3_EP_DELAY_STOP))
3737 return;
3738
3739 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
3740 (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
3741 return;
3742
3743 /*
3744 * If a Setup packet is received but yet to DMA out, the controller will
3745 * not process the End Transfer command of any endpoint. Polling of its
3746 * DEPCMD.CmdAct may block setting up TRB for Setup packet, causing a
3747 * timeout. Delay issuing the End Transfer command until the Setup TRB is
3748 * prepared.
3749 */
3750 if (dwc->ep0state != EP0_SETUP_PHASE && !dwc->delayed_status) {
3751 dep->flags |= DWC3_EP_DELAY_STOP;
3752 return;
3753 }
3754
3755 /*
3756 * NOTICE: We are violating what the Databook says about the
3757 * EndTransfer command. Ideally we would _always_ wait for the
3758 * EndTransfer Command Completion IRQ, but that's causing too
3759 * much trouble synchronizing between us and gadget driver.
3760 *
3761 * We have discussed this with the IP Provider and it was
3762 * suggested to giveback all requests here.
3763 *
3764 * Note also that a similar handling was tested by Synopsys
3765 * (thanks a lot Paul) and nothing bad has come out of it.
3766 * In short, what we're doing is issuing EndTransfer with
3767 * CMDIOC bit set and delay kicking transfer until the
3768 * EndTransfer command had completed.
3769 *
3770 * As of IP version 3.10a of the DWC_usb3 IP, the controller
3771 * supports a mode to work around the above limitation. The
3772 * software can poll the CMDACT bit in the DEPCMD register
3773 * after issuing a EndTransfer command. This mode is enabled
3774 * by writing GUCTL2[14]. This polling is already done in the
3775 * dwc3_send_gadget_ep_cmd() function so if the mode is
3776 * enabled, the EndTransfer command will have completed upon
3777 * returning from this function.
3778 *
3779 * This mode is NOT available on the DWC_usb31 IP.
3780 */
3781
3782 __dwc3_stop_active_transfer(dep, force, interrupt);
3783}
3784
3785static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
3786{
3787 u32 epnum;
3788
3789 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
3790 struct dwc3_ep *dep;
3791 int ret;
3792
3793 dep = dwc->eps[epnum];
3794 if (!dep)
3795 continue;
3796
3797 if (!(dep->flags & DWC3_EP_STALL))
3798 continue;
3799
3800 dep->flags &= ~DWC3_EP_STALL;
3801
3802 ret = dwc3_send_clear_stall_ep_cmd(dep);
3803 WARN_ON_ONCE(ret);
3804 }
3805}
3806
3807static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
3808{
3809 int reg;
3810
3811 dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
3812
3813 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3814 reg &= ~DWC3_DCTL_INITU1ENA;
3815 reg &= ~DWC3_DCTL_INITU2ENA;
3816 dwc3_gadget_dctl_write_safe(dwc, reg);
3817
3818 dwc->connected = false;
3819
3820 dwc3_disconnect_gadget(dwc);
3821
3822 dwc->gadget->speed = USB_SPEED_UNKNOWN;
3823 dwc->setup_packet_pending = false;
3824 usb_gadget_set_state(dwc->gadget, USB_STATE_NOTATTACHED);
3825
3826 if (dwc->ep0state != EP0_SETUP_PHASE) {
3827 unsigned int dir;
3828
3829 dir = !!dwc->ep0_expect_in;
3830 if (dwc->ep0state == EP0_DATA_PHASE)
3831 dwc3_ep0_end_control_data(dwc, dwc->eps[dir]);
3832 else
3833 dwc3_ep0_end_control_data(dwc, dwc->eps[!dir]);
3834 dwc3_ep0_stall_and_restart(dwc);
3835 }
3836}
3837
3838static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
3839{
3840 u32 reg;
3841
3842 /*
3843 * Ideally, dwc3_reset_gadget() would trigger the function
3844 * drivers to stop any active transfers through ep disable.
3845 * However, for functions which defer ep disable, such as mass
3846 * storage, we will need to rely on the call to stop active
3847 * transfers here, and avoid allowing of request queuing.
3848 */
3849 dwc->connected = false;
3850
3851 /*
3852 * WORKAROUND: DWC3 revisions <1.88a have an issue which
3853 * would cause a missing Disconnect Event if there's a
3854 * pending Setup Packet in the FIFO.
3855 *
3856 * There's no suggested workaround on the official Bug
3857 * report, which states that "unless the driver/application
3858 * is doing any special handling of a disconnect event,
3859 * there is no functional issue".
3860 *
3861 * Unfortunately, it turns out that we _do_ some special
3862 * handling of a disconnect event, namely complete all
3863 * pending transfers, notify gadget driver of the
3864 * disconnection, and so on.
3865 *
3866 * Our suggested workaround is to follow the Disconnect
3867 * Event steps here, instead, based on a setup_packet_pending
3868 * flag. Such flag gets set whenever we have a SETUP_PENDING
3869 * status for EP0 TRBs and gets cleared on XferComplete for the
3870 * same endpoint.
3871 *
3872 * Refers to:
3873 *
3874 * STAR#9000466709: RTL: Device : Disconnect event not
3875 * generated if setup packet pending in FIFO
3876 */
3877 if (DWC3_VER_IS_PRIOR(DWC3, 188A)) {
3878 if (dwc->setup_packet_pending)
3879 dwc3_gadget_disconnect_interrupt(dwc);
3880 }
3881
3882 dwc3_reset_gadget(dwc);
3883
3884 /*
3885 * From SNPS databook section 8.1.2, the EP0 should be in setup
3886 * phase. So ensure that EP0 is in setup phase by issuing a stall
3887 * and restart if EP0 is not in setup phase.
3888 */
3889 if (dwc->ep0state != EP0_SETUP_PHASE) {
3890 unsigned int dir;
3891
3892 dir = !!dwc->ep0_expect_in;
3893 if (dwc->ep0state == EP0_DATA_PHASE)
3894 dwc3_ep0_end_control_data(dwc, dwc->eps[dir]);
3895 else
3896 dwc3_ep0_end_control_data(dwc, dwc->eps[!dir]);
3897
3898 dwc->eps[0]->trb_enqueue = 0;
3899 dwc->eps[1]->trb_enqueue = 0;
3900
3901 dwc3_ep0_stall_and_restart(dwc);
3902 }
3903
3904 /*
3905 * In the Synopsis DesignWare Cores USB3 Databook Rev. 3.30a
3906 * Section 4.1.2 Table 4-2, it states that during a USB reset, the SW
3907 * needs to ensure that it sends "a DEPENDXFER command for any active
3908 * transfers."
3909 */
3910 dwc3_stop_active_transfers(dwc);
3911 dwc->connected = true;
3912
3913 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3914 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
3915 dwc3_gadget_dctl_write_safe(dwc, reg);
3916 dwc->test_mode = false;
3917 dwc3_clear_stall_all_ep(dwc);
3918
3919 /* Reset device address to zero */
3920 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
3921 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
3922 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
3923}
3924
3925static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
3926{
3927 struct dwc3_ep *dep;
3928 int ret;
3929 u32 reg;
3930 u8 lanes = 1;
3931 u8 speed;
3932
3933 if (!dwc->softconnect)
3934 return;
3935
3936 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
3937 speed = reg & DWC3_DSTS_CONNECTSPD;
3938 dwc->speed = speed;
3939
3940 if (DWC3_IP_IS(DWC32))
3941 lanes = DWC3_DSTS_CONNLANES(reg) + 1;
3942
3943 dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;
3944
3945 /*
3946 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
3947 * each time on Connect Done.
3948 *
3949 * Currently we always use the reset value. If any platform
3950 * wants to set this to a different value, we need to add a
3951 * setting and update GCTL.RAMCLKSEL here.
3952 */
3953
3954 switch (speed) {
3955 case DWC3_DSTS_SUPERSPEED_PLUS:
3956 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
3957 dwc->gadget->ep0->maxpacket = 512;
3958 dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
3959
3960 if (lanes > 1)
3961 dwc->gadget->ssp_rate = USB_SSP_GEN_2x2;
3962 else
3963 dwc->gadget->ssp_rate = USB_SSP_GEN_2x1;
3964 break;
3965 case DWC3_DSTS_SUPERSPEED:
3966 /*
3967 * WORKAROUND: DWC3 revisions <1.90a have an issue which
3968 * would cause a missing USB3 Reset event.
3969 *
3970 * In such situations, we should force a USB3 Reset
3971 * event by calling our dwc3_gadget_reset_interrupt()
3972 * routine.
3973 *
3974 * Refers to:
3975 *
3976 * STAR#9000483510: RTL: SS : USB3 reset event may
3977 * not be generated always when the link enters poll
3978 */
3979 if (DWC3_VER_IS_PRIOR(DWC3, 190A))
3980 dwc3_gadget_reset_interrupt(dwc);
3981
3982 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
3983 dwc->gadget->ep0->maxpacket = 512;
3984 dwc->gadget->speed = USB_SPEED_SUPER;
3985
3986 if (lanes > 1) {
3987 dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
3988 dwc->gadget->ssp_rate = USB_SSP_GEN_1x2;
3989 }
3990 break;
3991 case DWC3_DSTS_HIGHSPEED:
3992 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
3993 dwc->gadget->ep0->maxpacket = 64;
3994 dwc->gadget->speed = USB_SPEED_HIGH;
3995 break;
3996 case DWC3_DSTS_FULLSPEED:
3997 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
3998 dwc->gadget->ep0->maxpacket = 64;
3999 dwc->gadget->speed = USB_SPEED_FULL;
4000 break;
4001 }
4002
4003 dwc->eps[1]->endpoint.maxpacket = dwc->gadget->ep0->maxpacket;
4004
4005 /* Enable USB2 LPM Capability */
4006
4007 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A) &&
4008 !dwc->usb2_gadget_lpm_disable &&
4009 (speed != DWC3_DSTS_SUPERSPEED) &&
4010 (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
4011 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
4012 reg |= DWC3_DCFG_LPM_CAP;
4013 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
4014
4015 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4016 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
4017
4018 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
4019 (dwc->is_utmi_l1_suspend << 4));
4020
4021 /*
4022 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
4023 * DCFG.LPMCap is set, core responses with an ACK and the
4024 * BESL value in the LPM token is less than or equal to LPM
4025 * NYET threshold.
4026 */
4027 WARN_ONCE(DWC3_VER_IS_PRIOR(DWC3, 240A) && dwc->has_lpm_erratum,
4028 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
4029
4030 if (dwc->has_lpm_erratum && !DWC3_VER_IS_PRIOR(DWC3, 240A))
4031 reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);
4032
4033 dwc3_gadget_dctl_write_safe(dwc, reg);
4034 } else {
4035 if (dwc->usb2_gadget_lpm_disable) {
4036 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
4037 reg &= ~DWC3_DCFG_LPM_CAP;
4038 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
4039 }
4040
4041 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4042 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
4043 dwc3_gadget_dctl_write_safe(dwc, reg);
4044 }
4045
4046 dep = dwc->eps[0];
4047 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
4048 if (ret) {
4049 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
4050 return;
4051 }
4052
4053 dep = dwc->eps[1];
4054 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
4055 if (ret) {
4056 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
4057 return;
4058 }
4059
4060 /*
4061 * Configure PHY via GUSB3PIPECTLn if required.
4062 *
4063 * Update GTXFIFOSIZn
4064 *
4065 * In both cases reset values should be sufficient.
4066 */
4067}
4068
4069static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
4070{
4071 /*
4072 * TODO take core out of low power mode when that's
4073 * implemented.
4074 */
4075
4076 if (dwc->async_callbacks && dwc->gadget_driver->resume) {
4077 spin_unlock(&dwc->lock);
4078 dwc->gadget_driver->resume(dwc->gadget);
4079 spin_lock(&dwc->lock);
4080 }
4081}
4082
4083static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
4084 unsigned int evtinfo)
4085{
4086 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
4087 unsigned int pwropt;
4088
4089 /*
4090 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
4091 * Hibernation mode enabled which would show up when device detects
4092 * host-initiated U3 exit.
4093 *
4094 * In that case, device will generate a Link State Change Interrupt
4095 * from U3 to RESUME which is only necessary if Hibernation is
4096 * configured in.
4097 *
4098 * There are no functional changes due to such spurious event and we
4099 * just need to ignore it.
4100 *
4101 * Refers to:
4102 *
4103 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
4104 * operational mode
4105 */
4106 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
4107 if (DWC3_VER_IS_PRIOR(DWC3, 250A) &&
4108 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
4109 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
4110 (next == DWC3_LINK_STATE_RESUME)) {
4111 return;
4112 }
4113 }
4114
4115 /*
4116 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
4117 * on the link partner, the USB session might do multiple entry/exit
4118 * of low power states before a transfer takes place.
4119 *
4120 * Due to this problem, we might experience lower throughput. The
4121 * suggested workaround is to disable DCTL[12:9] bits if we're
4122 * transitioning from U1/U2 to U0 and enable those bits again
4123 * after a transfer completes and there are no pending transfers
4124 * on any of the enabled endpoints.
4125 *
4126 * This is the first half of that workaround.
4127 *
4128 * Refers to:
4129 *
4130 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
4131 * core send LGO_Ux entering U0
4132 */
4133 if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
4134 if (next == DWC3_LINK_STATE_U0) {
4135 u32 u1u2;
4136 u32 reg;
4137
4138 switch (dwc->link_state) {
4139 case DWC3_LINK_STATE_U1:
4140 case DWC3_LINK_STATE_U2:
4141 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4142 u1u2 = reg & (DWC3_DCTL_INITU2ENA
4143 | DWC3_DCTL_ACCEPTU2ENA
4144 | DWC3_DCTL_INITU1ENA
4145 | DWC3_DCTL_ACCEPTU1ENA);
4146
4147 if (!dwc->u1u2)
4148 dwc->u1u2 = reg & u1u2;
4149
4150 reg &= ~u1u2;
4151
4152 dwc3_gadget_dctl_write_safe(dwc, reg);
4153 break;
4154 default:
4155 /* do nothing */
4156 break;
4157 }
4158 }
4159 }
4160
4161 switch (next) {
4162 case DWC3_LINK_STATE_U1:
4163 if (dwc->speed == USB_SPEED_SUPER)
4164 dwc3_suspend_gadget(dwc);
4165 break;
4166 case DWC3_LINK_STATE_U2:
4167 case DWC3_LINK_STATE_U3:
4168 dwc3_suspend_gadget(dwc);
4169 break;
4170 case DWC3_LINK_STATE_RESUME:
4171 dwc3_resume_gadget(dwc);
4172 break;
4173 default:
4174 /* do nothing */
4175 break;
4176 }
4177
4178 dwc->link_state = next;
4179}
4180
4181static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
4182 unsigned int evtinfo)
4183{
4184 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
4185
4186 if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
4187 dwc3_suspend_gadget(dwc);
4188
4189 dwc->link_state = next;
4190}
4191
4192static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
4193 unsigned int evtinfo)
4194{
4195 unsigned int is_ss = evtinfo & BIT(4);
4196
4197 /*
4198 * WORKAROUND: DWC3 revision 2.20a with hibernation support
4199 * have a known issue which can cause USB CV TD.9.23 to fail
4200 * randomly.
4201 *
4202 * Because of this issue, core could generate bogus hibernation
4203 * events which SW needs to ignore.
4204 *
4205 * Refers to:
4206 *
4207 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
4208 * Device Fallback from SuperSpeed
4209 */
4210 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
4211 return;
4212
4213 /* enter hibernation here */
4214}
4215
4216static void dwc3_gadget_interrupt(struct dwc3 *dwc,
4217 const struct dwc3_event_devt *event)
4218{
4219 switch (event->type) {
4220 case DWC3_DEVICE_EVENT_DISCONNECT:
4221 dwc3_gadget_disconnect_interrupt(dwc);
4222 break;
4223 case DWC3_DEVICE_EVENT_RESET:
4224 dwc3_gadget_reset_interrupt(dwc);
4225 break;
4226 case DWC3_DEVICE_EVENT_CONNECT_DONE:
4227 dwc3_gadget_conndone_interrupt(dwc);
4228 break;
4229 case DWC3_DEVICE_EVENT_WAKEUP:
4230 dwc3_gadget_wakeup_interrupt(dwc);
4231 break;
4232 case DWC3_DEVICE_EVENT_HIBER_REQ:
4233 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
4234 "unexpected hibernation event\n"))
4235 break;
4236
4237 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
4238 break;
4239 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
4240 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
4241 break;
4242 case DWC3_DEVICE_EVENT_SUSPEND:
4243 /* It changed to be suspend event for version 2.30a and above */
4244 if (!DWC3_VER_IS_PRIOR(DWC3, 230A)) {
4245 /*
4246 * Ignore suspend event until the gadget enters into
4247 * USB_STATE_CONFIGURED state.
4248 */
4249 if (dwc->gadget->state >= USB_STATE_CONFIGURED)
4250 dwc3_gadget_suspend_interrupt(dwc,
4251 event->event_info);
4252 }
4253 break;
4254 case DWC3_DEVICE_EVENT_SOF:
4255 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
4256 case DWC3_DEVICE_EVENT_CMD_CMPL:
4257 case DWC3_DEVICE_EVENT_OVERFLOW:
4258 break;
4259 default:
4260 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
4261 }
4262}
4263
4264static void dwc3_process_event_entry(struct dwc3 *dwc,
4265 const union dwc3_event *event)
4266{
4267 trace_dwc3_event(event->raw, dwc);
4268
4269 if (!event->type.is_devspec)
4270 dwc3_endpoint_interrupt(dwc, &event->depevt);
4271 else if (event->type.type == DWC3_EVENT_TYPE_DEV)
4272 dwc3_gadget_interrupt(dwc, &event->devt);
4273 else
4274 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
4275}
4276
4277static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
4278{
4279 struct dwc3 *dwc = evt->dwc;
4280 irqreturn_t ret = IRQ_NONE;
4281 int left;
4282
4283 left = evt->count;
4284
4285 if (!(evt->flags & DWC3_EVENT_PENDING))
4286 return IRQ_NONE;
4287
4288 while (left > 0) {
4289 union dwc3_event event;
4290
4291 event.raw = *(u32 *) (evt->cache + evt->lpos);
4292
4293 dwc3_process_event_entry(dwc, &event);
4294
4295 /*
4296 * FIXME we wrap around correctly to the next entry as
4297 * almost all entries are 4 bytes in size. There is one
4298 * entry which has 12 bytes which is a regular entry
4299 * followed by 8 bytes data. ATM I don't know how
4300 * things are organized if we get next to the a
4301 * boundary so I worry about that once we try to handle
4302 * that.
4303 */
4304 evt->lpos = (evt->lpos + 4) % evt->length;
4305 left -= 4;
4306 }
4307
4308 evt->count = 0;
4309 ret = IRQ_HANDLED;
4310
4311 /* Unmask interrupt */
4312 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
4313 DWC3_GEVNTSIZ_SIZE(evt->length));
4314
4315 if (dwc->imod_interval) {
4316 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
4317 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
4318 }
4319
4320 /* Keep the clearing of DWC3_EVENT_PENDING at the end */
4321 evt->flags &= ~DWC3_EVENT_PENDING;
4322
4323 return ret;
4324}
4325
4326static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
4327{
4328 struct dwc3_event_buffer *evt = _evt;
4329 struct dwc3 *dwc = evt->dwc;
4330 unsigned long flags;
4331 irqreturn_t ret = IRQ_NONE;
4332
4333 local_bh_disable();
4334 spin_lock_irqsave(&dwc->lock, flags);
4335 ret = dwc3_process_event_buf(evt);
4336 spin_unlock_irqrestore(&dwc->lock, flags);
4337 local_bh_enable();
4338
4339 return ret;
4340}
4341
4342static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
4343{
4344 struct dwc3 *dwc = evt->dwc;
4345 u32 amount;
4346 u32 count;
4347
4348 if (pm_runtime_suspended(dwc->dev)) {
4349 pm_runtime_get(dwc->dev);
4350 disable_irq_nosync(dwc->irq_gadget);
4351 dwc->pending_events = true;
4352 return IRQ_HANDLED;
4353 }
4354
4355 /*
4356 * With PCIe legacy interrupt, test shows that top-half irq handler can
4357 * be called again after HW interrupt deassertion. Check if bottom-half
4358 * irq event handler completes before caching new event to prevent
4359 * losing events.
4360 */
4361 if (evt->flags & DWC3_EVENT_PENDING)
4362 return IRQ_HANDLED;
4363
4364 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
4365 count &= DWC3_GEVNTCOUNT_MASK;
4366 if (!count)
4367 return IRQ_NONE;
4368
4369 evt->count = count;
4370 evt->flags |= DWC3_EVENT_PENDING;
4371
4372 /* Mask interrupt */
4373 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
4374 DWC3_GEVNTSIZ_INTMASK | DWC3_GEVNTSIZ_SIZE(evt->length));
4375
4376 amount = min(count, evt->length - evt->lpos);
4377 memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
4378
4379 if (amount < count)
4380 memcpy(evt->cache, evt->buf, count - amount);
4381
4382 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
4383
4384 return IRQ_WAKE_THREAD;
4385}
4386
4387static irqreturn_t dwc3_interrupt(int irq, void *_evt)
4388{
4389 struct dwc3_event_buffer *evt = _evt;
4390
4391 return dwc3_check_event_buf(evt);
4392}
4393
4394static int dwc3_gadget_get_irq(struct dwc3 *dwc)
4395{
4396 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
4397 int irq;
4398
4399 irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
4400 if (irq > 0)
4401 goto out;
4402
4403 if (irq == -EPROBE_DEFER)
4404 goto out;
4405
4406 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
4407 if (irq > 0)
4408 goto out;
4409
4410 if (irq == -EPROBE_DEFER)
4411 goto out;
4412
4413 irq = platform_get_irq(dwc3_pdev, 0);
4414 if (irq > 0)
4415 goto out;
4416
4417 if (!irq)
4418 irq = -EINVAL;
4419
4420out:
4421 return irq;
4422}
4423
4424static void dwc_gadget_release(struct device *dev)
4425{
4426 struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
4427
4428 kfree(gadget);
4429}
4430
4431/**
4432 * dwc3_gadget_init - initializes gadget related registers
4433 * @dwc: pointer to our controller context structure
4434 *
4435 * Returns 0 on success otherwise negative errno.
4436 */
4437int dwc3_gadget_init(struct dwc3 *dwc)
4438{
4439 int ret;
4440 int irq;
4441 struct device *dev;
4442
4443 irq = dwc3_gadget_get_irq(dwc);
4444 if (irq < 0) {
4445 ret = irq;
4446 goto err0;
4447 }
4448
4449 dwc->irq_gadget = irq;
4450
4451 dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
4452 sizeof(*dwc->ep0_trb) * 2,
4453 &dwc->ep0_trb_addr, GFP_KERNEL);
4454 if (!dwc->ep0_trb) {
4455 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
4456 ret = -ENOMEM;
4457 goto err0;
4458 }
4459
4460 dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
4461 if (!dwc->setup_buf) {
4462 ret = -ENOMEM;
4463 goto err1;
4464 }
4465
4466 dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
4467 &dwc->bounce_addr, GFP_KERNEL);
4468 if (!dwc->bounce) {
4469 ret = -ENOMEM;
4470 goto err2;
4471 }
4472
4473 init_completion(&dwc->ep0_in_setup);
4474 dwc->gadget = kzalloc(sizeof(struct usb_gadget), GFP_KERNEL);
4475 if (!dwc->gadget) {
4476 ret = -ENOMEM;
4477 goto err3;
4478 }
4479
4480
4481 usb_initialize_gadget(dwc->dev, dwc->gadget, dwc_gadget_release);
4482 dev = &dwc->gadget->dev;
4483 dev->platform_data = dwc;
4484 dwc->gadget->ops = &dwc3_gadget_ops;
4485 dwc->gadget->speed = USB_SPEED_UNKNOWN;
4486 dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;
4487 dwc->gadget->sg_supported = true;
4488 dwc->gadget->name = "dwc3-gadget";
4489 dwc->gadget->lpm_capable = !dwc->usb2_gadget_lpm_disable;
4490
4491 /*
4492 * FIXME We might be setting max_speed to <SUPER, however versions
4493 * <2.20a of dwc3 have an issue with metastability (documented
4494 * elsewhere in this driver) which tells us we can't set max speed to
4495 * anything lower than SUPER.
4496 *
4497 * Because gadget.max_speed is only used by composite.c and function
4498 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
4499 * to happen so we avoid sending SuperSpeed Capability descriptor
4500 * together with our BOS descriptor as that could confuse host into
4501 * thinking we can handle super speed.
4502 *
4503 * Note that, in fact, we won't even support GetBOS requests when speed
4504 * is less than super speed because we don't have means, yet, to tell
4505 * composite.c that we are USB 2.0 + LPM ECN.
4506 */
4507 if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
4508 !dwc->dis_metastability_quirk)
4509 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
4510 dwc->revision);
4511
4512 dwc->gadget->max_speed = dwc->maximum_speed;
4513 dwc->gadget->max_ssp_rate = dwc->max_ssp_rate;
4514
4515 /*
4516 * REVISIT: Here we should clear all pending IRQs to be
4517 * sure we're starting from a well known location.
4518 */
4519
4520 ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
4521 if (ret)
4522 goto err4;
4523
4524 ret = usb_add_gadget(dwc->gadget);
4525 if (ret) {
4526 dev_err(dwc->dev, "failed to add gadget\n");
4527 goto err5;
4528 }
4529
4530 if (DWC3_IP_IS(DWC32) && dwc->maximum_speed == USB_SPEED_SUPER_PLUS)
4531 dwc3_gadget_set_ssp_rate(dwc->gadget, dwc->max_ssp_rate);
4532 else
4533 dwc3_gadget_set_speed(dwc->gadget, dwc->maximum_speed);
4534
4535 return 0;
4536
4537err5:
4538 dwc3_gadget_free_endpoints(dwc);
4539err4:
4540 usb_put_gadget(dwc->gadget);
4541 dwc->gadget = NULL;
4542err3:
4543 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
4544 dwc->bounce_addr);
4545
4546err2:
4547 kfree(dwc->setup_buf);
4548
4549err1:
4550 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
4551 dwc->ep0_trb, dwc->ep0_trb_addr);
4552
4553err0:
4554 return ret;
4555}
4556
4557/* -------------------------------------------------------------------------- */
4558
4559void dwc3_gadget_exit(struct dwc3 *dwc)
4560{
4561 if (!dwc->gadget)
4562 return;
4563
4564 usb_del_gadget(dwc->gadget);
4565 dwc3_gadget_free_endpoints(dwc);
4566 usb_put_gadget(dwc->gadget);
4567 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
4568 dwc->bounce_addr);
4569 kfree(dwc->setup_buf);
4570 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
4571 dwc->ep0_trb, dwc->ep0_trb_addr);
4572}
4573
4574int dwc3_gadget_suspend(struct dwc3 *dwc)
4575{
4576 unsigned long flags;
4577
4578 if (!dwc->gadget_driver)
4579 return 0;
4580
4581 dwc3_gadget_run_stop(dwc, false, false);
4582
4583 spin_lock_irqsave(&dwc->lock, flags);
4584 dwc3_disconnect_gadget(dwc);
4585 __dwc3_gadget_stop(dwc);
4586 spin_unlock_irqrestore(&dwc->lock, flags);
4587
4588 return 0;
4589}
4590
4591int dwc3_gadget_resume(struct dwc3 *dwc)
4592{
4593 int ret;
4594
4595 if (!dwc->gadget_driver || !dwc->softconnect)
4596 return 0;
4597
4598 ret = __dwc3_gadget_start(dwc);
4599 if (ret < 0)
4600 goto err0;
4601
4602 ret = dwc3_gadget_run_stop(dwc, true, false);
4603 if (ret < 0)
4604 goto err1;
4605
4606 return 0;
4607
4608err1:
4609 __dwc3_gadget_stop(dwc);
4610
4611err0:
4612 return ret;
4613}
4614
4615void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
4616{
4617 if (dwc->pending_events) {
4618 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
4619 dwc->pending_events = false;
4620 enable_irq(dwc->irq_gadget);
4621 }
4622}
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 "core.h"
34#include "gadget.h"
35#include "io.h"
36
37/**
38 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
39 * @dwc: pointer to our context structure
40 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
41 *
42 * Caller should take care of locking. This function will
43 * return 0 on success or -EINVAL if wrong Test Selector
44 * is passed
45 */
46int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
47{
48 u32 reg;
49
50 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
51 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
52
53 switch (mode) {
54 case TEST_J:
55 case TEST_K:
56 case TEST_SE0_NAK:
57 case TEST_PACKET:
58 case TEST_FORCE_EN:
59 reg |= mode << 1;
60 break;
61 default:
62 return -EINVAL;
63 }
64
65 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
66
67 return 0;
68}
69
70/**
71 * dwc3_gadget_get_link_state - Gets current state of USB Link
72 * @dwc: pointer to our context structure
73 *
74 * Caller should take care of locking. This function will
75 * return the link state on success (>= 0) or -ETIMEDOUT.
76 */
77int dwc3_gadget_get_link_state(struct dwc3 *dwc)
78{
79 u32 reg;
80
81 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
82
83 return DWC3_DSTS_USBLNKST(reg);
84}
85
86/**
87 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
88 * @dwc: pointer to our context structure
89 * @state: the state to put link into
90 *
91 * Caller should take care of locking. This function will
92 * return 0 on success or -ETIMEDOUT.
93 */
94int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
95{
96 int retries = 10000;
97 u32 reg;
98
99 /*
100 * Wait until device controller is ready. Only applies to 1.94a and
101 * later RTL.
102 */
103 if (dwc->revision >= DWC3_REVISION_194A) {
104 while (--retries) {
105 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
106 if (reg & DWC3_DSTS_DCNRD)
107 udelay(5);
108 else
109 break;
110 }
111
112 if (retries <= 0)
113 return -ETIMEDOUT;
114 }
115
116 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
117 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
118
119 /* set requested state */
120 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
121 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
122
123 /*
124 * The following code is racy when called from dwc3_gadget_wakeup,
125 * and is not needed, at least on newer versions
126 */
127 if (dwc->revision >= DWC3_REVISION_194A)
128 return 0;
129
130 /* wait for a change in DSTS */
131 retries = 10000;
132 while (--retries) {
133 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
134
135 if (DWC3_DSTS_USBLNKST(reg) == state)
136 return 0;
137
138 udelay(5);
139 }
140
141 dev_vdbg(dwc->dev, "link state change request timed out\n");
142
143 return -ETIMEDOUT;
144}
145
146/**
147 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
148 * @dwc: pointer to our context structure
149 *
150 * This function will a best effort FIFO allocation in order
151 * to improve FIFO usage and throughput, while still allowing
152 * us to enable as many endpoints as possible.
153 *
154 * Keep in mind that this operation will be highly dependent
155 * on the configured size for RAM1 - which contains TxFifo -,
156 * the amount of endpoints enabled on coreConsultant tool, and
157 * the width of the Master Bus.
158 *
159 * In the ideal world, we would always be able to satisfy the
160 * following equation:
161 *
162 * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
163 * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
164 *
165 * Unfortunately, due to many variables that's not always the case.
166 */
167int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
168{
169 int last_fifo_depth = 0;
170 int ram1_depth;
171 int fifo_size;
172 int mdwidth;
173 int num;
174
175 if (!dwc->needs_fifo_resize)
176 return 0;
177
178 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
179 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
180
181 /* MDWIDTH is represented in bits, we need it in bytes */
182 mdwidth >>= 3;
183
184 /*
185 * FIXME For now we will only allocate 1 wMaxPacketSize space
186 * for each enabled endpoint, later patches will come to
187 * improve this algorithm so that we better use the internal
188 * FIFO space
189 */
190 for (num = 0; num < dwc->num_in_eps; num++) {
191 /* bit0 indicates direction; 1 means IN ep */
192 struct dwc3_ep *dep = dwc->eps[(num << 1) | 1];
193 int mult = 1;
194 int tmp;
195
196 if (!(dep->flags & DWC3_EP_ENABLED))
197 continue;
198
199 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
200 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
201 mult = 3;
202
203 /*
204 * REVISIT: the following assumes we will always have enough
205 * space available on the FIFO RAM for all possible use cases.
206 * Make sure that's true somehow and change FIFO allocation
207 * accordingly.
208 *
209 * If we have Bulk or Isochronous endpoints, we want
210 * them to be able to be very, very fast. So we're giving
211 * those endpoints a fifo_size which is enough for 3 full
212 * packets
213 */
214 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
215 tmp += mdwidth;
216
217 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
218
219 fifo_size |= (last_fifo_depth << 16);
220
221 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
222 dep->name, last_fifo_depth, fifo_size & 0xffff);
223
224 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
225
226 last_fifo_depth += (fifo_size & 0xffff);
227 }
228
229 return 0;
230}
231
232void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
233 int status)
234{
235 struct dwc3 *dwc = dep->dwc;
236 int i;
237
238 if (req->queued) {
239 i = 0;
240 do {
241 dep->busy_slot++;
242 /*
243 * Skip LINK TRB. We can't use req->trb and check for
244 * DWC3_TRBCTL_LINK_TRB because it points the TRB we
245 * just completed (not the LINK TRB).
246 */
247 if (((dep->busy_slot & DWC3_TRB_MASK) ==
248 DWC3_TRB_NUM- 1) &&
249 usb_endpoint_xfer_isoc(dep->endpoint.desc))
250 dep->busy_slot++;
251 } while(++i < req->request.num_mapped_sgs);
252 req->queued = false;
253 }
254 list_del(&req->list);
255 req->trb = NULL;
256
257 if (req->request.status == -EINPROGRESS)
258 req->request.status = status;
259
260 if (dwc->ep0_bounced && dep->number == 0)
261 dwc->ep0_bounced = false;
262 else
263 usb_gadget_unmap_request(&dwc->gadget, &req->request,
264 req->direction);
265
266 dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
267 req, dep->name, req->request.actual,
268 req->request.length, status);
269
270 spin_unlock(&dwc->lock);
271 req->request.complete(&dep->endpoint, &req->request);
272 spin_lock(&dwc->lock);
273}
274
275static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
276{
277 switch (cmd) {
278 case DWC3_DEPCMD_DEPSTARTCFG:
279 return "Start New Configuration";
280 case DWC3_DEPCMD_ENDTRANSFER:
281 return "End Transfer";
282 case DWC3_DEPCMD_UPDATETRANSFER:
283 return "Update Transfer";
284 case DWC3_DEPCMD_STARTTRANSFER:
285 return "Start Transfer";
286 case DWC3_DEPCMD_CLEARSTALL:
287 return "Clear Stall";
288 case DWC3_DEPCMD_SETSTALL:
289 return "Set Stall";
290 case DWC3_DEPCMD_GETEPSTATE:
291 return "Get Endpoint State";
292 case DWC3_DEPCMD_SETTRANSFRESOURCE:
293 return "Set Endpoint Transfer Resource";
294 case DWC3_DEPCMD_SETEPCONFIG:
295 return "Set Endpoint Configuration";
296 default:
297 return "UNKNOWN command";
298 }
299}
300
301int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
302{
303 u32 timeout = 500;
304 u32 reg;
305
306 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
307 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
308
309 do {
310 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
311 if (!(reg & DWC3_DGCMD_CMDACT)) {
312 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
313 DWC3_DGCMD_STATUS(reg));
314 return 0;
315 }
316
317 /*
318 * We can't sleep here, because it's also called from
319 * interrupt context.
320 */
321 timeout--;
322 if (!timeout)
323 return -ETIMEDOUT;
324 udelay(1);
325 } while (1);
326}
327
328int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
329 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
330{
331 struct dwc3_ep *dep = dwc->eps[ep];
332 u32 timeout = 500;
333 u32 reg;
334
335 dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
336 dep->name,
337 dwc3_gadget_ep_cmd_string(cmd), params->param0,
338 params->param1, params->param2);
339
340 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
341 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
342 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
343
344 dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
345 do {
346 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
347 if (!(reg & DWC3_DEPCMD_CMDACT)) {
348 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
349 DWC3_DEPCMD_STATUS(reg));
350 return 0;
351 }
352
353 /*
354 * We can't sleep here, because it is also called from
355 * interrupt context.
356 */
357 timeout--;
358 if (!timeout)
359 return -ETIMEDOUT;
360
361 udelay(1);
362 } while (1);
363}
364
365static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
366 struct dwc3_trb *trb)
367{
368 u32 offset = (char *) trb - (char *) dep->trb_pool;
369
370 return dep->trb_pool_dma + offset;
371}
372
373static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
374{
375 struct dwc3 *dwc = dep->dwc;
376
377 if (dep->trb_pool)
378 return 0;
379
380 if (dep->number == 0 || dep->number == 1)
381 return 0;
382
383 dep->trb_pool = dma_alloc_coherent(dwc->dev,
384 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
385 &dep->trb_pool_dma, GFP_KERNEL);
386 if (!dep->trb_pool) {
387 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
388 dep->name);
389 return -ENOMEM;
390 }
391
392 return 0;
393}
394
395static void dwc3_free_trb_pool(struct dwc3_ep *dep)
396{
397 struct dwc3 *dwc = dep->dwc;
398
399 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
400 dep->trb_pool, dep->trb_pool_dma);
401
402 dep->trb_pool = NULL;
403 dep->trb_pool_dma = 0;
404}
405
406static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
407{
408 struct dwc3_gadget_ep_cmd_params params;
409 u32 cmd;
410
411 memset(¶ms, 0x00, sizeof(params));
412
413 if (dep->number != 1) {
414 cmd = DWC3_DEPCMD_DEPSTARTCFG;
415 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
416 if (dep->number > 1) {
417 if (dwc->start_config_issued)
418 return 0;
419 dwc->start_config_issued = true;
420 cmd |= DWC3_DEPCMD_PARAM(2);
421 }
422
423 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
424 }
425
426 return 0;
427}
428
429static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
430 const struct usb_endpoint_descriptor *desc,
431 const struct usb_ss_ep_comp_descriptor *comp_desc,
432 bool ignore, bool restore)
433{
434 struct dwc3_gadget_ep_cmd_params params;
435
436 memset(¶ms, 0x00, sizeof(params));
437
438 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
439 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
440
441 /* Burst size is only needed in SuperSpeed mode */
442 if (dwc->gadget.speed == USB_SPEED_SUPER) {
443 u32 burst = dep->endpoint.maxburst - 1;
444
445 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
446 }
447
448 if (ignore)
449 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
450
451 if (restore) {
452 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
453 params.param2 |= dep->saved_state;
454 }
455
456 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
457 | DWC3_DEPCFG_XFER_NOT_READY_EN;
458
459 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
460 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
461 | DWC3_DEPCFG_STREAM_EVENT_EN;
462 dep->stream_capable = true;
463 }
464
465 if (usb_endpoint_xfer_isoc(desc))
466 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
467
468 /*
469 * We are doing 1:1 mapping for endpoints, meaning
470 * Physical Endpoints 2 maps to Logical Endpoint 2 and
471 * so on. We consider the direction bit as part of the physical
472 * endpoint number. So USB endpoint 0x81 is 0x03.
473 */
474 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
475
476 /*
477 * We must use the lower 16 TX FIFOs even though
478 * HW might have more
479 */
480 if (dep->direction)
481 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
482
483 if (desc->bInterval) {
484 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
485 dep->interval = 1 << (desc->bInterval - 1);
486 }
487
488 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
489 DWC3_DEPCMD_SETEPCONFIG, ¶ms);
490}
491
492static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
493{
494 struct dwc3_gadget_ep_cmd_params params;
495
496 memset(¶ms, 0x00, sizeof(params));
497
498 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
499
500 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
501 DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms);
502}
503
504/**
505 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
506 * @dep: endpoint to be initialized
507 * @desc: USB Endpoint Descriptor
508 *
509 * Caller should take care of locking
510 */
511static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
512 const struct usb_endpoint_descriptor *desc,
513 const struct usb_ss_ep_comp_descriptor *comp_desc,
514 bool ignore, bool restore)
515{
516 struct dwc3 *dwc = dep->dwc;
517 u32 reg;
518 int ret = -ENOMEM;
519
520 dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
521
522 if (!(dep->flags & DWC3_EP_ENABLED)) {
523 ret = dwc3_gadget_start_config(dwc, dep);
524 if (ret)
525 return ret;
526 }
527
528 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
529 restore);
530 if (ret)
531 return ret;
532
533 if (!(dep->flags & DWC3_EP_ENABLED)) {
534 struct dwc3_trb *trb_st_hw;
535 struct dwc3_trb *trb_link;
536
537 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
538 if (ret)
539 return ret;
540
541 dep->endpoint.desc = desc;
542 dep->comp_desc = comp_desc;
543 dep->type = usb_endpoint_type(desc);
544 dep->flags |= DWC3_EP_ENABLED;
545
546 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
547 reg |= DWC3_DALEPENA_EP(dep->number);
548 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
549
550 if (!usb_endpoint_xfer_isoc(desc))
551 return 0;
552
553 memset(&trb_link, 0, sizeof(trb_link));
554
555 /* Link TRB for ISOC. The HWO bit is never reset */
556 trb_st_hw = &dep->trb_pool[0];
557
558 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
559
560 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
561 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
562 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
563 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
564 }
565
566 return 0;
567}
568
569static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
570static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
571{
572 struct dwc3_request *req;
573
574 if (!list_empty(&dep->req_queued)) {
575 dwc3_stop_active_transfer(dwc, dep->number, true);
576
577 /* - giveback all requests to gadget driver */
578 while (!list_empty(&dep->req_queued)) {
579 req = next_request(&dep->req_queued);
580
581 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
582 }
583 }
584
585 while (!list_empty(&dep->request_list)) {
586 req = next_request(&dep->request_list);
587
588 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
589 }
590}
591
592/**
593 * __dwc3_gadget_ep_disable - Disables a HW endpoint
594 * @dep: the endpoint to disable
595 *
596 * This function also removes requests which are currently processed ny the
597 * hardware and those which are not yet scheduled.
598 * Caller should take care of locking.
599 */
600static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
601{
602 struct dwc3 *dwc = dep->dwc;
603 u32 reg;
604
605 dwc3_remove_requests(dwc, dep);
606
607 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
608 reg &= ~DWC3_DALEPENA_EP(dep->number);
609 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
610
611 dep->stream_capable = false;
612 dep->endpoint.desc = NULL;
613 dep->comp_desc = NULL;
614 dep->type = 0;
615 dep->flags = 0;
616
617 return 0;
618}
619
620/* -------------------------------------------------------------------------- */
621
622static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
623 const struct usb_endpoint_descriptor *desc)
624{
625 return -EINVAL;
626}
627
628static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
629{
630 return -EINVAL;
631}
632
633/* -------------------------------------------------------------------------- */
634
635static int dwc3_gadget_ep_enable(struct usb_ep *ep,
636 const struct usb_endpoint_descriptor *desc)
637{
638 struct dwc3_ep *dep;
639 struct dwc3 *dwc;
640 unsigned long flags;
641 int ret;
642
643 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
644 pr_debug("dwc3: invalid parameters\n");
645 return -EINVAL;
646 }
647
648 if (!desc->wMaxPacketSize) {
649 pr_debug("dwc3: missing wMaxPacketSize\n");
650 return -EINVAL;
651 }
652
653 dep = to_dwc3_ep(ep);
654 dwc = dep->dwc;
655
656 if (dep->flags & DWC3_EP_ENABLED) {
657 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
658 dep->name);
659 return 0;
660 }
661
662 switch (usb_endpoint_type(desc)) {
663 case USB_ENDPOINT_XFER_CONTROL:
664 strlcat(dep->name, "-control", sizeof(dep->name));
665 break;
666 case USB_ENDPOINT_XFER_ISOC:
667 strlcat(dep->name, "-isoc", sizeof(dep->name));
668 break;
669 case USB_ENDPOINT_XFER_BULK:
670 strlcat(dep->name, "-bulk", sizeof(dep->name));
671 break;
672 case USB_ENDPOINT_XFER_INT:
673 strlcat(dep->name, "-int", sizeof(dep->name));
674 break;
675 default:
676 dev_err(dwc->dev, "invalid endpoint transfer type\n");
677 }
678
679 spin_lock_irqsave(&dwc->lock, flags);
680 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
681 spin_unlock_irqrestore(&dwc->lock, flags);
682
683 return ret;
684}
685
686static int dwc3_gadget_ep_disable(struct usb_ep *ep)
687{
688 struct dwc3_ep *dep;
689 struct dwc3 *dwc;
690 unsigned long flags;
691 int ret;
692
693 if (!ep) {
694 pr_debug("dwc3: invalid parameters\n");
695 return -EINVAL;
696 }
697
698 dep = to_dwc3_ep(ep);
699 dwc = dep->dwc;
700
701 if (!(dep->flags & DWC3_EP_ENABLED)) {
702 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
703 dep->name);
704 return 0;
705 }
706
707 snprintf(dep->name, sizeof(dep->name), "ep%d%s",
708 dep->number >> 1,
709 (dep->number & 1) ? "in" : "out");
710
711 spin_lock_irqsave(&dwc->lock, flags);
712 ret = __dwc3_gadget_ep_disable(dep);
713 spin_unlock_irqrestore(&dwc->lock, flags);
714
715 return ret;
716}
717
718static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
719 gfp_t gfp_flags)
720{
721 struct dwc3_request *req;
722 struct dwc3_ep *dep = to_dwc3_ep(ep);
723 struct dwc3 *dwc = dep->dwc;
724
725 req = kzalloc(sizeof(*req), gfp_flags);
726 if (!req) {
727 dev_err(dwc->dev, "not enough memory\n");
728 return NULL;
729 }
730
731 req->epnum = dep->number;
732 req->dep = dep;
733
734 return &req->request;
735}
736
737static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
738 struct usb_request *request)
739{
740 struct dwc3_request *req = to_dwc3_request(request);
741
742 kfree(req);
743}
744
745/**
746 * dwc3_prepare_one_trb - setup one TRB from one request
747 * @dep: endpoint for which this request is prepared
748 * @req: dwc3_request pointer
749 */
750static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
751 struct dwc3_request *req, dma_addr_t dma,
752 unsigned length, unsigned last, unsigned chain, unsigned node)
753{
754 struct dwc3 *dwc = dep->dwc;
755 struct dwc3_trb *trb;
756
757 dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
758 dep->name, req, (unsigned long long) dma,
759 length, last ? " last" : "",
760 chain ? " chain" : "");
761
762 /* Skip the LINK-TRB on ISOC */
763 if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
764 usb_endpoint_xfer_isoc(dep->endpoint.desc))
765 dep->free_slot++;
766
767 trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
768
769 if (!req->trb) {
770 dwc3_gadget_move_request_queued(req);
771 req->trb = trb;
772 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
773 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
774 }
775
776 dep->free_slot++;
777
778 trb->size = DWC3_TRB_SIZE_LENGTH(length);
779 trb->bpl = lower_32_bits(dma);
780 trb->bph = upper_32_bits(dma);
781
782 switch (usb_endpoint_type(dep->endpoint.desc)) {
783 case USB_ENDPOINT_XFER_CONTROL:
784 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
785 break;
786
787 case USB_ENDPOINT_XFER_ISOC:
788 if (!node)
789 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
790 else
791 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
792 break;
793
794 case USB_ENDPOINT_XFER_BULK:
795 case USB_ENDPOINT_XFER_INT:
796 trb->ctrl = DWC3_TRBCTL_NORMAL;
797 break;
798 default:
799 /*
800 * This is only possible with faulty memory because we
801 * checked it already :)
802 */
803 BUG();
804 }
805
806 if (!req->request.no_interrupt && !chain)
807 trb->ctrl |= DWC3_TRB_CTRL_IOC;
808
809 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
810 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
811 trb->ctrl |= DWC3_TRB_CTRL_CSP;
812 } else if (last) {
813 trb->ctrl |= DWC3_TRB_CTRL_LST;
814 }
815
816 if (chain)
817 trb->ctrl |= DWC3_TRB_CTRL_CHN;
818
819 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
820 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
821
822 trb->ctrl |= DWC3_TRB_CTRL_HWO;
823}
824
825/*
826 * dwc3_prepare_trbs - setup TRBs from requests
827 * @dep: endpoint for which requests are being prepared
828 * @starting: true if the endpoint is idle and no requests are queued.
829 *
830 * The function goes through the requests list and sets up TRBs for the
831 * transfers. The function returns once there are no more TRBs available or
832 * it runs out of requests.
833 */
834static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
835{
836 struct dwc3_request *req, *n;
837 u32 trbs_left;
838 u32 max;
839 unsigned int last_one = 0;
840
841 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
842
843 /* the first request must not be queued */
844 trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
845
846 /* Can't wrap around on a non-isoc EP since there's no link TRB */
847 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
848 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
849 if (trbs_left > max)
850 trbs_left = max;
851 }
852
853 /*
854 * If busy & slot are equal than it is either full or empty. If we are
855 * starting to process requests then we are empty. Otherwise we are
856 * full and don't do anything
857 */
858 if (!trbs_left) {
859 if (!starting)
860 return;
861 trbs_left = DWC3_TRB_NUM;
862 /*
863 * In case we start from scratch, we queue the ISOC requests
864 * starting from slot 1. This is done because we use ring
865 * buffer and have no LST bit to stop us. Instead, we place
866 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
867 * after the first request so we start at slot 1 and have
868 * 7 requests proceed before we hit the first IOC.
869 * Other transfer types don't use the ring buffer and are
870 * processed from the first TRB until the last one. Since we
871 * don't wrap around we have to start at the beginning.
872 */
873 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
874 dep->busy_slot = 1;
875 dep->free_slot = 1;
876 } else {
877 dep->busy_slot = 0;
878 dep->free_slot = 0;
879 }
880 }
881
882 /* The last TRB is a link TRB, not used for xfer */
883 if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
884 return;
885
886 list_for_each_entry_safe(req, n, &dep->request_list, list) {
887 unsigned length;
888 dma_addr_t dma;
889 last_one = false;
890
891 if (req->request.num_mapped_sgs > 0) {
892 struct usb_request *request = &req->request;
893 struct scatterlist *sg = request->sg;
894 struct scatterlist *s;
895 int i;
896
897 for_each_sg(sg, s, request->num_mapped_sgs, i) {
898 unsigned chain = true;
899
900 length = sg_dma_len(s);
901 dma = sg_dma_address(s);
902
903 if (i == (request->num_mapped_sgs - 1) ||
904 sg_is_last(s)) {
905 if (list_is_last(&req->list,
906 &dep->request_list))
907 last_one = true;
908 chain = false;
909 }
910
911 trbs_left--;
912 if (!trbs_left)
913 last_one = true;
914
915 if (last_one)
916 chain = false;
917
918 dwc3_prepare_one_trb(dep, req, dma, length,
919 last_one, chain, i);
920
921 if (last_one)
922 break;
923 }
924 } else {
925 dma = req->request.dma;
926 length = req->request.length;
927 trbs_left--;
928
929 if (!trbs_left)
930 last_one = 1;
931
932 /* Is this the last request? */
933 if (list_is_last(&req->list, &dep->request_list))
934 last_one = 1;
935
936 dwc3_prepare_one_trb(dep, req, dma, length,
937 last_one, false, 0);
938
939 if (last_one)
940 break;
941 }
942 }
943}
944
945static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
946 int start_new)
947{
948 struct dwc3_gadget_ep_cmd_params params;
949 struct dwc3_request *req;
950 struct dwc3 *dwc = dep->dwc;
951 int ret;
952 u32 cmd;
953
954 if (start_new && (dep->flags & DWC3_EP_BUSY)) {
955 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
956 return -EBUSY;
957 }
958 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
959
960 /*
961 * If we are getting here after a short-out-packet we don't enqueue any
962 * new requests as we try to set the IOC bit only on the last request.
963 */
964 if (start_new) {
965 if (list_empty(&dep->req_queued))
966 dwc3_prepare_trbs(dep, start_new);
967
968 /* req points to the first request which will be sent */
969 req = next_request(&dep->req_queued);
970 } else {
971 dwc3_prepare_trbs(dep, start_new);
972
973 /*
974 * req points to the first request where HWO changed from 0 to 1
975 */
976 req = next_request(&dep->req_queued);
977 }
978 if (!req) {
979 dep->flags |= DWC3_EP_PENDING_REQUEST;
980 return 0;
981 }
982
983 memset(¶ms, 0, sizeof(params));
984
985 if (start_new) {
986 params.param0 = upper_32_bits(req->trb_dma);
987 params.param1 = lower_32_bits(req->trb_dma);
988 cmd = DWC3_DEPCMD_STARTTRANSFER;
989 } else {
990 cmd = DWC3_DEPCMD_UPDATETRANSFER;
991 }
992
993 cmd |= DWC3_DEPCMD_PARAM(cmd_param);
994 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
995 if (ret < 0) {
996 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
997
998 /*
999 * FIXME we need to iterate over the list of requests
1000 * here and stop, unmap, free and del each of the linked
1001 * requests instead of what we do now.
1002 */
1003 usb_gadget_unmap_request(&dwc->gadget, &req->request,
1004 req->direction);
1005 list_del(&req->list);
1006 return ret;
1007 }
1008
1009 dep->flags |= DWC3_EP_BUSY;
1010
1011 if (start_new) {
1012 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
1013 dep->number);
1014 WARN_ON_ONCE(!dep->resource_index);
1015 }
1016
1017 return 0;
1018}
1019
1020static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1021 struct dwc3_ep *dep, u32 cur_uf)
1022{
1023 u32 uf;
1024
1025 if (list_empty(&dep->request_list)) {
1026 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1027 dep->name);
1028 dep->flags |= DWC3_EP_PENDING_REQUEST;
1029 return;
1030 }
1031
1032 /* 4 micro frames in the future */
1033 uf = cur_uf + dep->interval * 4;
1034
1035 __dwc3_gadget_kick_transfer(dep, uf, 1);
1036}
1037
1038static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1039 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1040{
1041 u32 cur_uf, mask;
1042
1043 mask = ~(dep->interval - 1);
1044 cur_uf = event->parameters & mask;
1045
1046 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1047}
1048
1049static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1050{
1051 struct dwc3 *dwc = dep->dwc;
1052 int ret;
1053
1054 req->request.actual = 0;
1055 req->request.status = -EINPROGRESS;
1056 req->direction = dep->direction;
1057 req->epnum = dep->number;
1058
1059 /*
1060 * We only add to our list of requests now and
1061 * start consuming the list once we get XferNotReady
1062 * IRQ.
1063 *
1064 * That way, we avoid doing anything that we don't need
1065 * to do now and defer it until the point we receive a
1066 * particular token from the Host side.
1067 *
1068 * This will also avoid Host cancelling URBs due to too
1069 * many NAKs.
1070 */
1071 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1072 dep->direction);
1073 if (ret)
1074 return ret;
1075
1076 list_add_tail(&req->list, &dep->request_list);
1077
1078 /*
1079 * There are a few special cases:
1080 *
1081 * 1. XferNotReady with empty list of requests. We need to kick the
1082 * transfer here in that situation, otherwise we will be NAKing
1083 * forever. If we get XferNotReady before gadget driver has a
1084 * chance to queue a request, we will ACK the IRQ but won't be
1085 * able to receive the data until the next request is queued.
1086 * The following code is handling exactly that.
1087 *
1088 */
1089 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1090 /*
1091 * If xfernotready is already elapsed and it is a case
1092 * of isoc transfer, then issue END TRANSFER, so that
1093 * you can receive xfernotready again and can have
1094 * notion of current microframe.
1095 */
1096 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1097 if (list_empty(&dep->req_queued)) {
1098 dwc3_stop_active_transfer(dwc, dep->number, true);
1099 dep->flags = DWC3_EP_ENABLED;
1100 }
1101 return 0;
1102 }
1103
1104 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1105 if (ret && ret != -EBUSY)
1106 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1107 dep->name);
1108 return ret;
1109 }
1110
1111 /*
1112 * 2. XferInProgress on Isoc EP with an active transfer. We need to
1113 * kick the transfer here after queuing a request, otherwise the
1114 * core may not see the modified TRB(s).
1115 */
1116 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1117 (dep->flags & DWC3_EP_BUSY) &&
1118 !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1119 WARN_ON_ONCE(!dep->resource_index);
1120 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1121 false);
1122 if (ret && ret != -EBUSY)
1123 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1124 dep->name);
1125 return ret;
1126 }
1127
1128 /*
1129 * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1130 * right away, otherwise host will not know we have streams to be
1131 * handled.
1132 */
1133 if (dep->stream_capable) {
1134 int ret;
1135
1136 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1137 if (ret && ret != -EBUSY) {
1138 struct dwc3 *dwc = dep->dwc;
1139
1140 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1141 dep->name);
1142 }
1143 }
1144
1145 return 0;
1146}
1147
1148static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1149 gfp_t gfp_flags)
1150{
1151 struct dwc3_request *req = to_dwc3_request(request);
1152 struct dwc3_ep *dep = to_dwc3_ep(ep);
1153 struct dwc3 *dwc = dep->dwc;
1154
1155 unsigned long flags;
1156
1157 int ret;
1158
1159 if (!dep->endpoint.desc) {
1160 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1161 request, ep->name);
1162 return -ESHUTDOWN;
1163 }
1164
1165 dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1166 request, ep->name, request->length);
1167
1168 spin_lock_irqsave(&dwc->lock, flags);
1169 ret = __dwc3_gadget_ep_queue(dep, req);
1170 spin_unlock_irqrestore(&dwc->lock, flags);
1171
1172 return ret;
1173}
1174
1175static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1176 struct usb_request *request)
1177{
1178 struct dwc3_request *req = to_dwc3_request(request);
1179 struct dwc3_request *r = NULL;
1180
1181 struct dwc3_ep *dep = to_dwc3_ep(ep);
1182 struct dwc3 *dwc = dep->dwc;
1183
1184 unsigned long flags;
1185 int ret = 0;
1186
1187 spin_lock_irqsave(&dwc->lock, flags);
1188
1189 list_for_each_entry(r, &dep->request_list, list) {
1190 if (r == req)
1191 break;
1192 }
1193
1194 if (r != req) {
1195 list_for_each_entry(r, &dep->req_queued, list) {
1196 if (r == req)
1197 break;
1198 }
1199 if (r == req) {
1200 /* wait until it is processed */
1201 dwc3_stop_active_transfer(dwc, dep->number, true);
1202 goto out1;
1203 }
1204 dev_err(dwc->dev, "request %p was not queued to %s\n",
1205 request, ep->name);
1206 ret = -EINVAL;
1207 goto out0;
1208 }
1209
1210out1:
1211 /* giveback the request */
1212 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1213
1214out0:
1215 spin_unlock_irqrestore(&dwc->lock, flags);
1216
1217 return ret;
1218}
1219
1220int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
1221{
1222 struct dwc3_gadget_ep_cmd_params params;
1223 struct dwc3 *dwc = dep->dwc;
1224 int ret;
1225
1226 memset(¶ms, 0x00, sizeof(params));
1227
1228 if (value) {
1229 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1230 DWC3_DEPCMD_SETSTALL, ¶ms);
1231 if (ret)
1232 dev_err(dwc->dev, "failed to set STALL on %s\n",
1233 dep->name);
1234 else
1235 dep->flags |= DWC3_EP_STALL;
1236 } else {
1237 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1238 DWC3_DEPCMD_CLEARSTALL, ¶ms);
1239 if (ret)
1240 dev_err(dwc->dev, "failed to clear STALL on %s\n",
1241 dep->name);
1242 else
1243 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1244 }
1245
1246 return ret;
1247}
1248
1249static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1250{
1251 struct dwc3_ep *dep = to_dwc3_ep(ep);
1252 struct dwc3 *dwc = dep->dwc;
1253
1254 unsigned long flags;
1255
1256 int ret;
1257
1258 spin_lock_irqsave(&dwc->lock, flags);
1259
1260 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1261 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1262 ret = -EINVAL;
1263 goto out;
1264 }
1265
1266 ret = __dwc3_gadget_ep_set_halt(dep, value);
1267out:
1268 spin_unlock_irqrestore(&dwc->lock, flags);
1269
1270 return ret;
1271}
1272
1273static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1274{
1275 struct dwc3_ep *dep = to_dwc3_ep(ep);
1276 struct dwc3 *dwc = dep->dwc;
1277 unsigned long flags;
1278
1279 spin_lock_irqsave(&dwc->lock, flags);
1280 dep->flags |= DWC3_EP_WEDGE;
1281 spin_unlock_irqrestore(&dwc->lock, flags);
1282
1283 if (dep->number == 0 || dep->number == 1)
1284 return dwc3_gadget_ep0_set_halt(ep, 1);
1285 else
1286 return dwc3_gadget_ep_set_halt(ep, 1);
1287}
1288
1289/* -------------------------------------------------------------------------- */
1290
1291static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1292 .bLength = USB_DT_ENDPOINT_SIZE,
1293 .bDescriptorType = USB_DT_ENDPOINT,
1294 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1295};
1296
1297static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1298 .enable = dwc3_gadget_ep0_enable,
1299 .disable = dwc3_gadget_ep0_disable,
1300 .alloc_request = dwc3_gadget_ep_alloc_request,
1301 .free_request = dwc3_gadget_ep_free_request,
1302 .queue = dwc3_gadget_ep0_queue,
1303 .dequeue = dwc3_gadget_ep_dequeue,
1304 .set_halt = dwc3_gadget_ep0_set_halt,
1305 .set_wedge = dwc3_gadget_ep_set_wedge,
1306};
1307
1308static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1309 .enable = dwc3_gadget_ep_enable,
1310 .disable = dwc3_gadget_ep_disable,
1311 .alloc_request = dwc3_gadget_ep_alloc_request,
1312 .free_request = dwc3_gadget_ep_free_request,
1313 .queue = dwc3_gadget_ep_queue,
1314 .dequeue = dwc3_gadget_ep_dequeue,
1315 .set_halt = dwc3_gadget_ep_set_halt,
1316 .set_wedge = dwc3_gadget_ep_set_wedge,
1317};
1318
1319/* -------------------------------------------------------------------------- */
1320
1321static int dwc3_gadget_get_frame(struct usb_gadget *g)
1322{
1323 struct dwc3 *dwc = gadget_to_dwc(g);
1324 u32 reg;
1325
1326 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1327 return DWC3_DSTS_SOFFN(reg);
1328}
1329
1330static int dwc3_gadget_wakeup(struct usb_gadget *g)
1331{
1332 struct dwc3 *dwc = gadget_to_dwc(g);
1333
1334 unsigned long timeout;
1335 unsigned long flags;
1336
1337 u32 reg;
1338
1339 int ret = 0;
1340
1341 u8 link_state;
1342 u8 speed;
1343
1344 spin_lock_irqsave(&dwc->lock, flags);
1345
1346 /*
1347 * According to the Databook Remote wakeup request should
1348 * be issued only when the device is in early suspend state.
1349 *
1350 * We can check that via USB Link State bits in DSTS register.
1351 */
1352 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1353
1354 speed = reg & DWC3_DSTS_CONNECTSPD;
1355 if (speed == DWC3_DSTS_SUPERSPEED) {
1356 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1357 ret = -EINVAL;
1358 goto out;
1359 }
1360
1361 link_state = DWC3_DSTS_USBLNKST(reg);
1362
1363 switch (link_state) {
1364 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1365 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1366 break;
1367 default:
1368 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1369 link_state);
1370 ret = -EINVAL;
1371 goto out;
1372 }
1373
1374 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1375 if (ret < 0) {
1376 dev_err(dwc->dev, "failed to put link in Recovery\n");
1377 goto out;
1378 }
1379
1380 /* Recent versions do this automatically */
1381 if (dwc->revision < DWC3_REVISION_194A) {
1382 /* write zeroes to Link Change Request */
1383 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1384 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1385 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1386 }
1387
1388 /* poll until Link State changes to ON */
1389 timeout = jiffies + msecs_to_jiffies(100);
1390
1391 while (!time_after(jiffies, timeout)) {
1392 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1393
1394 /* in HS, means ON */
1395 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1396 break;
1397 }
1398
1399 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1400 dev_err(dwc->dev, "failed to send remote wakeup\n");
1401 ret = -EINVAL;
1402 }
1403
1404out:
1405 spin_unlock_irqrestore(&dwc->lock, flags);
1406
1407 return ret;
1408}
1409
1410static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1411 int is_selfpowered)
1412{
1413 struct dwc3 *dwc = gadget_to_dwc(g);
1414 unsigned long flags;
1415
1416 spin_lock_irqsave(&dwc->lock, flags);
1417 dwc->is_selfpowered = !!is_selfpowered;
1418 spin_unlock_irqrestore(&dwc->lock, flags);
1419
1420 return 0;
1421}
1422
1423static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1424{
1425 u32 reg;
1426 u32 timeout = 500;
1427
1428 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1429 if (is_on) {
1430 if (dwc->revision <= DWC3_REVISION_187A) {
1431 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1432 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1433 }
1434
1435 if (dwc->revision >= DWC3_REVISION_194A)
1436 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1437 reg |= DWC3_DCTL_RUN_STOP;
1438
1439 if (dwc->has_hibernation)
1440 reg |= DWC3_DCTL_KEEP_CONNECT;
1441
1442 dwc->pullups_connected = true;
1443 } else {
1444 reg &= ~DWC3_DCTL_RUN_STOP;
1445
1446 if (dwc->has_hibernation && !suspend)
1447 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1448
1449 dwc->pullups_connected = false;
1450 }
1451
1452 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1453
1454 do {
1455 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1456 if (is_on) {
1457 if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1458 break;
1459 } else {
1460 if (reg & DWC3_DSTS_DEVCTRLHLT)
1461 break;
1462 }
1463 timeout--;
1464 if (!timeout)
1465 return -ETIMEDOUT;
1466 udelay(1);
1467 } while (1);
1468
1469 dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1470 dwc->gadget_driver
1471 ? dwc->gadget_driver->function : "no-function",
1472 is_on ? "connect" : "disconnect");
1473
1474 return 0;
1475}
1476
1477static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1478{
1479 struct dwc3 *dwc = gadget_to_dwc(g);
1480 unsigned long flags;
1481 int ret;
1482
1483 is_on = !!is_on;
1484
1485 spin_lock_irqsave(&dwc->lock, flags);
1486 ret = dwc3_gadget_run_stop(dwc, is_on, false);
1487 spin_unlock_irqrestore(&dwc->lock, flags);
1488
1489 return ret;
1490}
1491
1492static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1493{
1494 u32 reg;
1495
1496 /* Enable all but Start and End of Frame IRQs */
1497 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1498 DWC3_DEVTEN_EVNTOVERFLOWEN |
1499 DWC3_DEVTEN_CMDCMPLTEN |
1500 DWC3_DEVTEN_ERRTICERREN |
1501 DWC3_DEVTEN_WKUPEVTEN |
1502 DWC3_DEVTEN_ULSTCNGEN |
1503 DWC3_DEVTEN_CONNECTDONEEN |
1504 DWC3_DEVTEN_USBRSTEN |
1505 DWC3_DEVTEN_DISCONNEVTEN);
1506
1507 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1508}
1509
1510static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1511{
1512 /* mask all interrupts */
1513 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1514}
1515
1516static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1517static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1518
1519static int dwc3_gadget_start(struct usb_gadget *g,
1520 struct usb_gadget_driver *driver)
1521{
1522 struct dwc3 *dwc = gadget_to_dwc(g);
1523 struct dwc3_ep *dep;
1524 unsigned long flags;
1525 int ret = 0;
1526 int irq;
1527 u32 reg;
1528
1529 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1530 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1531 IRQF_SHARED, "dwc3", dwc);
1532 if (ret) {
1533 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1534 irq, ret);
1535 goto err0;
1536 }
1537
1538 spin_lock_irqsave(&dwc->lock, flags);
1539
1540 if (dwc->gadget_driver) {
1541 dev_err(dwc->dev, "%s is already bound to %s\n",
1542 dwc->gadget.name,
1543 dwc->gadget_driver->driver.name);
1544 ret = -EBUSY;
1545 goto err1;
1546 }
1547
1548 dwc->gadget_driver = driver;
1549
1550 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1551 reg &= ~(DWC3_DCFG_SPEED_MASK);
1552
1553 /**
1554 * WORKAROUND: DWC3 revision < 2.20a have an issue
1555 * which would cause metastability state on Run/Stop
1556 * bit if we try to force the IP to USB2-only mode.
1557 *
1558 * Because of that, we cannot configure the IP to any
1559 * speed other than the SuperSpeed
1560 *
1561 * Refers to:
1562 *
1563 * STAR#9000525659: Clock Domain Crossing on DCTL in
1564 * USB 2.0 Mode
1565 */
1566 if (dwc->revision < DWC3_REVISION_220A) {
1567 reg |= DWC3_DCFG_SUPERSPEED;
1568 } else {
1569 switch (dwc->maximum_speed) {
1570 case USB_SPEED_LOW:
1571 reg |= DWC3_DSTS_LOWSPEED;
1572 break;
1573 case USB_SPEED_FULL:
1574 reg |= DWC3_DSTS_FULLSPEED1;
1575 break;
1576 case USB_SPEED_HIGH:
1577 reg |= DWC3_DSTS_HIGHSPEED;
1578 break;
1579 case USB_SPEED_SUPER: /* FALLTHROUGH */
1580 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1581 default:
1582 reg |= DWC3_DSTS_SUPERSPEED;
1583 }
1584 }
1585 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1586
1587 dwc->start_config_issued = false;
1588
1589 /* Start with SuperSpeed Default */
1590 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1591
1592 dep = dwc->eps[0];
1593 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1594 false);
1595 if (ret) {
1596 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1597 goto err2;
1598 }
1599
1600 dep = dwc->eps[1];
1601 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1602 false);
1603 if (ret) {
1604 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1605 goto err3;
1606 }
1607
1608 /* begin to receive SETUP packets */
1609 dwc->ep0state = EP0_SETUP_PHASE;
1610 dwc3_ep0_out_start(dwc);
1611
1612 dwc3_gadget_enable_irq(dwc);
1613
1614 spin_unlock_irqrestore(&dwc->lock, flags);
1615
1616 return 0;
1617
1618err3:
1619 __dwc3_gadget_ep_disable(dwc->eps[0]);
1620
1621err2:
1622 dwc->gadget_driver = NULL;
1623
1624err1:
1625 spin_unlock_irqrestore(&dwc->lock, flags);
1626
1627 free_irq(irq, dwc);
1628
1629err0:
1630 return ret;
1631}
1632
1633static int dwc3_gadget_stop(struct usb_gadget *g,
1634 struct usb_gadget_driver *driver)
1635{
1636 struct dwc3 *dwc = gadget_to_dwc(g);
1637 unsigned long flags;
1638 int irq;
1639
1640 spin_lock_irqsave(&dwc->lock, flags);
1641
1642 dwc3_gadget_disable_irq(dwc);
1643 __dwc3_gadget_ep_disable(dwc->eps[0]);
1644 __dwc3_gadget_ep_disable(dwc->eps[1]);
1645
1646 dwc->gadget_driver = NULL;
1647
1648 spin_unlock_irqrestore(&dwc->lock, flags);
1649
1650 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1651 free_irq(irq, dwc);
1652
1653 return 0;
1654}
1655
1656static const struct usb_gadget_ops dwc3_gadget_ops = {
1657 .get_frame = dwc3_gadget_get_frame,
1658 .wakeup = dwc3_gadget_wakeup,
1659 .set_selfpowered = dwc3_gadget_set_selfpowered,
1660 .pullup = dwc3_gadget_pullup,
1661 .udc_start = dwc3_gadget_start,
1662 .udc_stop = dwc3_gadget_stop,
1663};
1664
1665/* -------------------------------------------------------------------------- */
1666
1667static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1668 u8 num, u32 direction)
1669{
1670 struct dwc3_ep *dep;
1671 u8 i;
1672
1673 for (i = 0; i < num; i++) {
1674 u8 epnum = (i << 1) | (!!direction);
1675
1676 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1677 if (!dep) {
1678 dev_err(dwc->dev, "can't allocate endpoint %d\n",
1679 epnum);
1680 return -ENOMEM;
1681 }
1682
1683 dep->dwc = dwc;
1684 dep->number = epnum;
1685 dep->direction = !!direction;
1686 dwc->eps[epnum] = dep;
1687
1688 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1689 (epnum & 1) ? "in" : "out");
1690
1691 dep->endpoint.name = dep->name;
1692
1693 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
1694
1695 if (epnum == 0 || epnum == 1) {
1696 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1697 dep->endpoint.maxburst = 1;
1698 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1699 if (!epnum)
1700 dwc->gadget.ep0 = &dep->endpoint;
1701 } else {
1702 int ret;
1703
1704 usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1705 dep->endpoint.max_streams = 15;
1706 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1707 list_add_tail(&dep->endpoint.ep_list,
1708 &dwc->gadget.ep_list);
1709
1710 ret = dwc3_alloc_trb_pool(dep);
1711 if (ret)
1712 return ret;
1713 }
1714
1715 INIT_LIST_HEAD(&dep->request_list);
1716 INIT_LIST_HEAD(&dep->req_queued);
1717 }
1718
1719 return 0;
1720}
1721
1722static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1723{
1724 int ret;
1725
1726 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1727
1728 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1729 if (ret < 0) {
1730 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1731 return ret;
1732 }
1733
1734 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1735 if (ret < 0) {
1736 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1737 return ret;
1738 }
1739
1740 return 0;
1741}
1742
1743static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1744{
1745 struct dwc3_ep *dep;
1746 u8 epnum;
1747
1748 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1749 dep = dwc->eps[epnum];
1750 if (!dep)
1751 continue;
1752 /*
1753 * Physical endpoints 0 and 1 are special; they form the
1754 * bi-directional USB endpoint 0.
1755 *
1756 * For those two physical endpoints, we don't allocate a TRB
1757 * pool nor do we add them the endpoints list. Due to that, we
1758 * shouldn't do these two operations otherwise we would end up
1759 * with all sorts of bugs when removing dwc3.ko.
1760 */
1761 if (epnum != 0 && epnum != 1) {
1762 dwc3_free_trb_pool(dep);
1763 list_del(&dep->endpoint.ep_list);
1764 }
1765
1766 kfree(dep);
1767 }
1768}
1769
1770/* -------------------------------------------------------------------------- */
1771
1772static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1773 struct dwc3_request *req, struct dwc3_trb *trb,
1774 const struct dwc3_event_depevt *event, int status)
1775{
1776 unsigned int count;
1777 unsigned int s_pkt = 0;
1778 unsigned int trb_status;
1779
1780 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1781 /*
1782 * We continue despite the error. There is not much we
1783 * can do. If we don't clean it up we loop forever. If
1784 * we skip the TRB then it gets overwritten after a
1785 * while since we use them in a ring buffer. A BUG()
1786 * would help. Lets hope that if this occurs, someone
1787 * fixes the root cause instead of looking away :)
1788 */
1789 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1790 dep->name, trb);
1791 count = trb->size & DWC3_TRB_SIZE_MASK;
1792
1793 if (dep->direction) {
1794 if (count) {
1795 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1796 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1797 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1798 dep->name);
1799 /*
1800 * If missed isoc occurred and there is
1801 * no request queued then issue END
1802 * TRANSFER, so that core generates
1803 * next xfernotready and we will issue
1804 * a fresh START TRANSFER.
1805 * If there are still queued request
1806 * then wait, do not issue either END
1807 * or UPDATE TRANSFER, just attach next
1808 * request in request_list during
1809 * giveback.If any future queued request
1810 * is successfully transferred then we
1811 * will issue UPDATE TRANSFER for all
1812 * request in the request_list.
1813 */
1814 dep->flags |= DWC3_EP_MISSED_ISOC;
1815 } else {
1816 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1817 dep->name);
1818 status = -ECONNRESET;
1819 }
1820 } else {
1821 dep->flags &= ~DWC3_EP_MISSED_ISOC;
1822 }
1823 } else {
1824 if (count && (event->status & DEPEVT_STATUS_SHORT))
1825 s_pkt = 1;
1826 }
1827
1828 /*
1829 * We assume here we will always receive the entire data block
1830 * which we should receive. Meaning, if we program RX to
1831 * receive 4K but we receive only 2K, we assume that's all we
1832 * should receive and we simply bounce the request back to the
1833 * gadget driver for further processing.
1834 */
1835 req->request.actual += req->request.length - count;
1836 if (s_pkt)
1837 return 1;
1838 if ((event->status & DEPEVT_STATUS_LST) &&
1839 (trb->ctrl & (DWC3_TRB_CTRL_LST |
1840 DWC3_TRB_CTRL_HWO)))
1841 return 1;
1842 if ((event->status & DEPEVT_STATUS_IOC) &&
1843 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1844 return 1;
1845 return 0;
1846}
1847
1848static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1849 const struct dwc3_event_depevt *event, int status)
1850{
1851 struct dwc3_request *req;
1852 struct dwc3_trb *trb;
1853 unsigned int slot;
1854 unsigned int i;
1855 int ret;
1856
1857 do {
1858 req = next_request(&dep->req_queued);
1859 if (!req) {
1860 WARN_ON_ONCE(1);
1861 return 1;
1862 }
1863 i = 0;
1864 do {
1865 slot = req->start_slot + i;
1866 if ((slot == DWC3_TRB_NUM - 1) &&
1867 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1868 slot++;
1869 slot %= DWC3_TRB_NUM;
1870 trb = &dep->trb_pool[slot];
1871
1872 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1873 event, status);
1874 if (ret)
1875 break;
1876 }while (++i < req->request.num_mapped_sgs);
1877
1878 dwc3_gadget_giveback(dep, req, status);
1879
1880 if (ret)
1881 break;
1882 } while (1);
1883
1884 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1885 list_empty(&dep->req_queued)) {
1886 if (list_empty(&dep->request_list)) {
1887 /*
1888 * If there is no entry in request list then do
1889 * not issue END TRANSFER now. Just set PENDING
1890 * flag, so that END TRANSFER is issued when an
1891 * entry is added into request list.
1892 */
1893 dep->flags = DWC3_EP_PENDING_REQUEST;
1894 } else {
1895 dwc3_stop_active_transfer(dwc, dep->number, true);
1896 dep->flags = DWC3_EP_ENABLED;
1897 }
1898 return 1;
1899 }
1900
1901 return 1;
1902}
1903
1904static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1905 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1906 int start_new)
1907{
1908 unsigned status = 0;
1909 int clean_busy;
1910
1911 if (event->status & DEPEVT_STATUS_BUSERR)
1912 status = -ECONNRESET;
1913
1914 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1915 if (clean_busy)
1916 dep->flags &= ~DWC3_EP_BUSY;
1917
1918 /*
1919 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1920 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1921 */
1922 if (dwc->revision < DWC3_REVISION_183A) {
1923 u32 reg;
1924 int i;
1925
1926 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1927 dep = dwc->eps[i];
1928
1929 if (!(dep->flags & DWC3_EP_ENABLED))
1930 continue;
1931
1932 if (!list_empty(&dep->req_queued))
1933 return;
1934 }
1935
1936 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1937 reg |= dwc->u1u2;
1938 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1939
1940 dwc->u1u2 = 0;
1941 }
1942}
1943
1944static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1945 const struct dwc3_event_depevt *event)
1946{
1947 struct dwc3_ep *dep;
1948 u8 epnum = event->endpoint_number;
1949
1950 dep = dwc->eps[epnum];
1951
1952 if (!(dep->flags & DWC3_EP_ENABLED))
1953 return;
1954
1955 dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1956 dwc3_ep_event_string(event->endpoint_event));
1957
1958 if (epnum == 0 || epnum == 1) {
1959 dwc3_ep0_interrupt(dwc, event);
1960 return;
1961 }
1962
1963 switch (event->endpoint_event) {
1964 case DWC3_DEPEVT_XFERCOMPLETE:
1965 dep->resource_index = 0;
1966
1967 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1968 dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1969 dep->name);
1970 return;
1971 }
1972
1973 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1974 break;
1975 case DWC3_DEPEVT_XFERINPROGRESS:
1976 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1977 dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1978 dep->name);
1979 return;
1980 }
1981
1982 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1983 break;
1984 case DWC3_DEPEVT_XFERNOTREADY:
1985 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1986 dwc3_gadget_start_isoc(dwc, dep, event);
1987 } else {
1988 int ret;
1989
1990 dev_vdbg(dwc->dev, "%s: reason %s\n",
1991 dep->name, event->status &
1992 DEPEVT_STATUS_TRANSFER_ACTIVE
1993 ? "Transfer Active"
1994 : "Transfer Not Active");
1995
1996 ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1997 if (!ret || ret == -EBUSY)
1998 return;
1999
2000 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
2001 dep->name);
2002 }
2003
2004 break;
2005 case DWC3_DEPEVT_STREAMEVT:
2006 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
2007 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2008 dep->name);
2009 return;
2010 }
2011
2012 switch (event->status) {
2013 case DEPEVT_STREAMEVT_FOUND:
2014 dev_vdbg(dwc->dev, "Stream %d found and started\n",
2015 event->parameters);
2016
2017 break;
2018 case DEPEVT_STREAMEVT_NOTFOUND:
2019 /* FALLTHROUGH */
2020 default:
2021 dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
2022 }
2023 break;
2024 case DWC3_DEPEVT_RXTXFIFOEVT:
2025 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
2026 break;
2027 case DWC3_DEPEVT_EPCMDCMPLT:
2028 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
2029 break;
2030 }
2031}
2032
2033static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2034{
2035 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2036 spin_unlock(&dwc->lock);
2037 dwc->gadget_driver->disconnect(&dwc->gadget);
2038 spin_lock(&dwc->lock);
2039 }
2040}
2041
2042static void dwc3_suspend_gadget(struct dwc3 *dwc)
2043{
2044 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2045 spin_unlock(&dwc->lock);
2046 dwc->gadget_driver->suspend(&dwc->gadget);
2047 spin_lock(&dwc->lock);
2048 }
2049}
2050
2051static void dwc3_resume_gadget(struct dwc3 *dwc)
2052{
2053 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2054 spin_unlock(&dwc->lock);
2055 dwc->gadget_driver->resume(&dwc->gadget);
2056 spin_lock(&dwc->lock);
2057 }
2058}
2059
2060static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2061{
2062 struct dwc3_ep *dep;
2063 struct dwc3_gadget_ep_cmd_params params;
2064 u32 cmd;
2065 int ret;
2066
2067 dep = dwc->eps[epnum];
2068
2069 if (!dep->resource_index)
2070 return;
2071
2072 /*
2073 * NOTICE: We are violating what the Databook says about the
2074 * EndTransfer command. Ideally we would _always_ wait for the
2075 * EndTransfer Command Completion IRQ, but that's causing too
2076 * much trouble synchronizing between us and gadget driver.
2077 *
2078 * We have discussed this with the IP Provider and it was
2079 * suggested to giveback all requests here, but give HW some
2080 * extra time to synchronize with the interconnect. We're using
2081 * an arbitraty 100us delay for that.
2082 *
2083 * Note also that a similar handling was tested by Synopsys
2084 * (thanks a lot Paul) and nothing bad has come out of it.
2085 * In short, what we're doing is:
2086 *
2087 * - Issue EndTransfer WITH CMDIOC bit set
2088 * - Wait 100us
2089 */
2090
2091 cmd = DWC3_DEPCMD_ENDTRANSFER;
2092 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2093 cmd |= DWC3_DEPCMD_CMDIOC;
2094 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2095 memset(¶ms, 0, sizeof(params));
2096 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
2097 WARN_ON_ONCE(ret);
2098 dep->resource_index = 0;
2099 dep->flags &= ~DWC3_EP_BUSY;
2100 udelay(100);
2101}
2102
2103static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2104{
2105 u32 epnum;
2106
2107 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2108 struct dwc3_ep *dep;
2109
2110 dep = dwc->eps[epnum];
2111 if (!dep)
2112 continue;
2113
2114 if (!(dep->flags & DWC3_EP_ENABLED))
2115 continue;
2116
2117 dwc3_remove_requests(dwc, dep);
2118 }
2119}
2120
2121static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2122{
2123 u32 epnum;
2124
2125 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2126 struct dwc3_ep *dep;
2127 struct dwc3_gadget_ep_cmd_params params;
2128 int ret;
2129
2130 dep = dwc->eps[epnum];
2131 if (!dep)
2132 continue;
2133
2134 if (!(dep->flags & DWC3_EP_STALL))
2135 continue;
2136
2137 dep->flags &= ~DWC3_EP_STALL;
2138
2139 memset(¶ms, 0, sizeof(params));
2140 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2141 DWC3_DEPCMD_CLEARSTALL, ¶ms);
2142 WARN_ON_ONCE(ret);
2143 }
2144}
2145
2146static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2147{
2148 int reg;
2149
2150 dev_vdbg(dwc->dev, "%s\n", __func__);
2151
2152 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2153 reg &= ~DWC3_DCTL_INITU1ENA;
2154 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2155
2156 reg &= ~DWC3_DCTL_INITU2ENA;
2157 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2158
2159 dwc3_disconnect_gadget(dwc);
2160 dwc->start_config_issued = false;
2161
2162 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2163 dwc->setup_packet_pending = false;
2164}
2165
2166static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2167{
2168 u32 reg;
2169
2170 dev_vdbg(dwc->dev, "%s\n", __func__);
2171
2172 /*
2173 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2174 * would cause a missing Disconnect Event if there's a
2175 * pending Setup Packet in the FIFO.
2176 *
2177 * There's no suggested workaround on the official Bug
2178 * report, which states that "unless the driver/application
2179 * is doing any special handling of a disconnect event,
2180 * there is no functional issue".
2181 *
2182 * Unfortunately, it turns out that we _do_ some special
2183 * handling of a disconnect event, namely complete all
2184 * pending transfers, notify gadget driver of the
2185 * disconnection, and so on.
2186 *
2187 * Our suggested workaround is to follow the Disconnect
2188 * Event steps here, instead, based on a setup_packet_pending
2189 * flag. Such flag gets set whenever we have a XferNotReady
2190 * event on EP0 and gets cleared on XferComplete for the
2191 * same endpoint.
2192 *
2193 * Refers to:
2194 *
2195 * STAR#9000466709: RTL: Device : Disconnect event not
2196 * generated if setup packet pending in FIFO
2197 */
2198 if (dwc->revision < DWC3_REVISION_188A) {
2199 if (dwc->setup_packet_pending)
2200 dwc3_gadget_disconnect_interrupt(dwc);
2201 }
2202
2203 /* after reset -> Default State */
2204 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
2205
2206 if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
2207 dwc3_disconnect_gadget(dwc);
2208
2209 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2210 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2211 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2212 dwc->test_mode = false;
2213
2214 dwc3_stop_active_transfers(dwc);
2215 dwc3_clear_stall_all_ep(dwc);
2216 dwc->start_config_issued = false;
2217
2218 /* Reset device address to zero */
2219 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2220 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2221 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2222}
2223
2224static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2225{
2226 u32 reg;
2227 u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2228
2229 /*
2230 * We change the clock only at SS but I dunno why I would want to do
2231 * this. Maybe it becomes part of the power saving plan.
2232 */
2233
2234 if (speed != DWC3_DSTS_SUPERSPEED)
2235 return;
2236
2237 /*
2238 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2239 * each time on Connect Done.
2240 */
2241 if (!usb30_clock)
2242 return;
2243
2244 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2245 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2246 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2247}
2248
2249static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2250{
2251 struct dwc3_ep *dep;
2252 int ret;
2253 u32 reg;
2254 u8 speed;
2255
2256 dev_vdbg(dwc->dev, "%s\n", __func__);
2257
2258 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2259 speed = reg & DWC3_DSTS_CONNECTSPD;
2260 dwc->speed = speed;
2261
2262 dwc3_update_ram_clk_sel(dwc, speed);
2263
2264 switch (speed) {
2265 case DWC3_DCFG_SUPERSPEED:
2266 /*
2267 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2268 * would cause a missing USB3 Reset event.
2269 *
2270 * In such situations, we should force a USB3 Reset
2271 * event by calling our dwc3_gadget_reset_interrupt()
2272 * routine.
2273 *
2274 * Refers to:
2275 *
2276 * STAR#9000483510: RTL: SS : USB3 reset event may
2277 * not be generated always when the link enters poll
2278 */
2279 if (dwc->revision < DWC3_REVISION_190A)
2280 dwc3_gadget_reset_interrupt(dwc);
2281
2282 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2283 dwc->gadget.ep0->maxpacket = 512;
2284 dwc->gadget.speed = USB_SPEED_SUPER;
2285 break;
2286 case DWC3_DCFG_HIGHSPEED:
2287 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2288 dwc->gadget.ep0->maxpacket = 64;
2289 dwc->gadget.speed = USB_SPEED_HIGH;
2290 break;
2291 case DWC3_DCFG_FULLSPEED2:
2292 case DWC3_DCFG_FULLSPEED1:
2293 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2294 dwc->gadget.ep0->maxpacket = 64;
2295 dwc->gadget.speed = USB_SPEED_FULL;
2296 break;
2297 case DWC3_DCFG_LOWSPEED:
2298 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2299 dwc->gadget.ep0->maxpacket = 8;
2300 dwc->gadget.speed = USB_SPEED_LOW;
2301 break;
2302 }
2303
2304 /* Enable USB2 LPM Capability */
2305
2306 if ((dwc->revision > DWC3_REVISION_194A)
2307 && (speed != DWC3_DCFG_SUPERSPEED)) {
2308 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2309 reg |= DWC3_DCFG_LPM_CAP;
2310 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2311
2312 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2313 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2314
2315 /*
2316 * TODO: This should be configurable. For now using
2317 * maximum allowed HIRD threshold value of 0b1100
2318 */
2319 reg |= DWC3_DCTL_HIRD_THRES(12);
2320
2321 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2322 } else {
2323 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2324 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2325 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2326 }
2327
2328 dep = dwc->eps[0];
2329 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2330 false);
2331 if (ret) {
2332 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2333 return;
2334 }
2335
2336 dep = dwc->eps[1];
2337 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2338 false);
2339 if (ret) {
2340 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2341 return;
2342 }
2343
2344 /*
2345 * Configure PHY via GUSB3PIPECTLn if required.
2346 *
2347 * Update GTXFIFOSIZn
2348 *
2349 * In both cases reset values should be sufficient.
2350 */
2351}
2352
2353static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2354{
2355 dev_vdbg(dwc->dev, "%s\n", __func__);
2356
2357 /*
2358 * TODO take core out of low power mode when that's
2359 * implemented.
2360 */
2361
2362 dwc->gadget_driver->resume(&dwc->gadget);
2363}
2364
2365static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2366 unsigned int evtinfo)
2367{
2368 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2369 unsigned int pwropt;
2370
2371 /*
2372 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2373 * Hibernation mode enabled which would show up when device detects
2374 * host-initiated U3 exit.
2375 *
2376 * In that case, device will generate a Link State Change Interrupt
2377 * from U3 to RESUME which is only necessary if Hibernation is
2378 * configured in.
2379 *
2380 * There are no functional changes due to such spurious event and we
2381 * just need to ignore it.
2382 *
2383 * Refers to:
2384 *
2385 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2386 * operational mode
2387 */
2388 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2389 if ((dwc->revision < DWC3_REVISION_250A) &&
2390 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2391 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2392 (next == DWC3_LINK_STATE_RESUME)) {
2393 dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2394 return;
2395 }
2396 }
2397
2398 /*
2399 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2400 * on the link partner, the USB session might do multiple entry/exit
2401 * of low power states before a transfer takes place.
2402 *
2403 * Due to this problem, we might experience lower throughput. The
2404 * suggested workaround is to disable DCTL[12:9] bits if we're
2405 * transitioning from U1/U2 to U0 and enable those bits again
2406 * after a transfer completes and there are no pending transfers
2407 * on any of the enabled endpoints.
2408 *
2409 * This is the first half of that workaround.
2410 *
2411 * Refers to:
2412 *
2413 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2414 * core send LGO_Ux entering U0
2415 */
2416 if (dwc->revision < DWC3_REVISION_183A) {
2417 if (next == DWC3_LINK_STATE_U0) {
2418 u32 u1u2;
2419 u32 reg;
2420
2421 switch (dwc->link_state) {
2422 case DWC3_LINK_STATE_U1:
2423 case DWC3_LINK_STATE_U2:
2424 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2425 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2426 | DWC3_DCTL_ACCEPTU2ENA
2427 | DWC3_DCTL_INITU1ENA
2428 | DWC3_DCTL_ACCEPTU1ENA);
2429
2430 if (!dwc->u1u2)
2431 dwc->u1u2 = reg & u1u2;
2432
2433 reg &= ~u1u2;
2434
2435 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2436 break;
2437 default:
2438 /* do nothing */
2439 break;
2440 }
2441 }
2442 }
2443
2444 dwc->link_state = next;
2445
2446 switch (next) {
2447 case DWC3_LINK_STATE_U1:
2448 if (dwc->speed == USB_SPEED_SUPER)
2449 dwc3_suspend_gadget(dwc);
2450 break;
2451 case DWC3_LINK_STATE_U2:
2452 case DWC3_LINK_STATE_U3:
2453 dwc3_suspend_gadget(dwc);
2454 break;
2455 case DWC3_LINK_STATE_RESUME:
2456 dwc3_resume_gadget(dwc);
2457 break;
2458 default:
2459 /* do nothing */
2460 break;
2461 }
2462
2463 dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2464}
2465
2466static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2467 unsigned int evtinfo)
2468{
2469 unsigned int is_ss = evtinfo & BIT(4);
2470
2471 /**
2472 * WORKAROUND: DWC3 revison 2.20a with hibernation support
2473 * have a known issue which can cause USB CV TD.9.23 to fail
2474 * randomly.
2475 *
2476 * Because of this issue, core could generate bogus hibernation
2477 * events which SW needs to ignore.
2478 *
2479 * Refers to:
2480 *
2481 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2482 * Device Fallback from SuperSpeed
2483 */
2484 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2485 return;
2486
2487 /* enter hibernation here */
2488}
2489
2490static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2491 const struct dwc3_event_devt *event)
2492{
2493 switch (event->type) {
2494 case DWC3_DEVICE_EVENT_DISCONNECT:
2495 dwc3_gadget_disconnect_interrupt(dwc);
2496 break;
2497 case DWC3_DEVICE_EVENT_RESET:
2498 dwc3_gadget_reset_interrupt(dwc);
2499 break;
2500 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2501 dwc3_gadget_conndone_interrupt(dwc);
2502 break;
2503 case DWC3_DEVICE_EVENT_WAKEUP:
2504 dwc3_gadget_wakeup_interrupt(dwc);
2505 break;
2506 case DWC3_DEVICE_EVENT_HIBER_REQ:
2507 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2508 "unexpected hibernation event\n"))
2509 break;
2510
2511 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2512 break;
2513 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2514 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2515 break;
2516 case DWC3_DEVICE_EVENT_EOPF:
2517 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2518 break;
2519 case DWC3_DEVICE_EVENT_SOF:
2520 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2521 break;
2522 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2523 dev_vdbg(dwc->dev, "Erratic Error\n");
2524 break;
2525 case DWC3_DEVICE_EVENT_CMD_CMPL:
2526 dev_vdbg(dwc->dev, "Command Complete\n");
2527 break;
2528 case DWC3_DEVICE_EVENT_OVERFLOW:
2529 dev_vdbg(dwc->dev, "Overflow\n");
2530 break;
2531 default:
2532 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2533 }
2534}
2535
2536static void dwc3_process_event_entry(struct dwc3 *dwc,
2537 const union dwc3_event *event)
2538{
2539 /* Endpoint IRQ, handle it and return early */
2540 if (event->type.is_devspec == 0) {
2541 /* depevt */
2542 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2543 }
2544
2545 switch (event->type.type) {
2546 case DWC3_EVENT_TYPE_DEV:
2547 dwc3_gadget_interrupt(dwc, &event->devt);
2548 break;
2549 /* REVISIT what to do with Carkit and I2C events ? */
2550 default:
2551 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2552 }
2553}
2554
2555static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2556{
2557 struct dwc3_event_buffer *evt;
2558 irqreturn_t ret = IRQ_NONE;
2559 int left;
2560 u32 reg;
2561
2562 evt = dwc->ev_buffs[buf];
2563 left = evt->count;
2564
2565 if (!(evt->flags & DWC3_EVENT_PENDING))
2566 return IRQ_NONE;
2567
2568 while (left > 0) {
2569 union dwc3_event event;
2570
2571 event.raw = *(u32 *) (evt->buf + evt->lpos);
2572
2573 dwc3_process_event_entry(dwc, &event);
2574
2575 /*
2576 * FIXME we wrap around correctly to the next entry as
2577 * almost all entries are 4 bytes in size. There is one
2578 * entry which has 12 bytes which is a regular entry
2579 * followed by 8 bytes data. ATM I don't know how
2580 * things are organized if we get next to the a
2581 * boundary so I worry about that once we try to handle
2582 * that.
2583 */
2584 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2585 left -= 4;
2586
2587 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2588 }
2589
2590 evt->count = 0;
2591 evt->flags &= ~DWC3_EVENT_PENDING;
2592 ret = IRQ_HANDLED;
2593
2594 /* Unmask interrupt */
2595 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2596 reg &= ~DWC3_GEVNTSIZ_INTMASK;
2597 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2598
2599 return ret;
2600}
2601
2602static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2603{
2604 struct dwc3 *dwc = _dwc;
2605 unsigned long flags;
2606 irqreturn_t ret = IRQ_NONE;
2607 int i;
2608
2609 spin_lock_irqsave(&dwc->lock, flags);
2610
2611 for (i = 0; i < dwc->num_event_buffers; i++)
2612 ret |= dwc3_process_event_buf(dwc, i);
2613
2614 spin_unlock_irqrestore(&dwc->lock, flags);
2615
2616 return ret;
2617}
2618
2619static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2620{
2621 struct dwc3_event_buffer *evt;
2622 u32 count;
2623 u32 reg;
2624
2625 evt = dwc->ev_buffs[buf];
2626
2627 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2628 count &= DWC3_GEVNTCOUNT_MASK;
2629 if (!count)
2630 return IRQ_NONE;
2631
2632 evt->count = count;
2633 evt->flags |= DWC3_EVENT_PENDING;
2634
2635 /* Mask interrupt */
2636 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2637 reg |= DWC3_GEVNTSIZ_INTMASK;
2638 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2639
2640 return IRQ_WAKE_THREAD;
2641}
2642
2643static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2644{
2645 struct dwc3 *dwc = _dwc;
2646 int i;
2647 irqreturn_t ret = IRQ_NONE;
2648
2649 spin_lock(&dwc->lock);
2650
2651 for (i = 0; i < dwc->num_event_buffers; i++) {
2652 irqreturn_t status;
2653
2654 status = dwc3_check_event_buf(dwc, i);
2655 if (status == IRQ_WAKE_THREAD)
2656 ret = status;
2657 }
2658
2659 spin_unlock(&dwc->lock);
2660
2661 return ret;
2662}
2663
2664/**
2665 * dwc3_gadget_init - Initializes gadget related registers
2666 * @dwc: pointer to our controller context structure
2667 *
2668 * Returns 0 on success otherwise negative errno.
2669 */
2670int dwc3_gadget_init(struct dwc3 *dwc)
2671{
2672 int ret;
2673
2674 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2675 &dwc->ctrl_req_addr, GFP_KERNEL);
2676 if (!dwc->ctrl_req) {
2677 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2678 ret = -ENOMEM;
2679 goto err0;
2680 }
2681
2682 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2683 &dwc->ep0_trb_addr, GFP_KERNEL);
2684 if (!dwc->ep0_trb) {
2685 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2686 ret = -ENOMEM;
2687 goto err1;
2688 }
2689
2690 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2691 if (!dwc->setup_buf) {
2692 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2693 ret = -ENOMEM;
2694 goto err2;
2695 }
2696
2697 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2698 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2699 GFP_KERNEL);
2700 if (!dwc->ep0_bounce) {
2701 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2702 ret = -ENOMEM;
2703 goto err3;
2704 }
2705
2706 dwc->gadget.ops = &dwc3_gadget_ops;
2707 dwc->gadget.max_speed = USB_SPEED_SUPER;
2708 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2709 dwc->gadget.sg_supported = true;
2710 dwc->gadget.name = "dwc3-gadget";
2711
2712 /*
2713 * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2714 * on ep out.
2715 */
2716 dwc->gadget.quirk_ep_out_aligned_size = true;
2717
2718 /*
2719 * REVISIT: Here we should clear all pending IRQs to be
2720 * sure we're starting from a well known location.
2721 */
2722
2723 ret = dwc3_gadget_init_endpoints(dwc);
2724 if (ret)
2725 goto err4;
2726
2727 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2728 if (ret) {
2729 dev_err(dwc->dev, "failed to register udc\n");
2730 goto err4;
2731 }
2732
2733 return 0;
2734
2735err4:
2736 dwc3_gadget_free_endpoints(dwc);
2737 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2738 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2739
2740err3:
2741 kfree(dwc->setup_buf);
2742
2743err2:
2744 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2745 dwc->ep0_trb, dwc->ep0_trb_addr);
2746
2747err1:
2748 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2749 dwc->ctrl_req, dwc->ctrl_req_addr);
2750
2751err0:
2752 return ret;
2753}
2754
2755/* -------------------------------------------------------------------------- */
2756
2757void dwc3_gadget_exit(struct dwc3 *dwc)
2758{
2759 usb_del_gadget_udc(&dwc->gadget);
2760
2761 dwc3_gadget_free_endpoints(dwc);
2762
2763 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2764 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2765
2766 kfree(dwc->setup_buf);
2767
2768 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2769 dwc->ep0_trb, dwc->ep0_trb_addr);
2770
2771 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2772 dwc->ctrl_req, dwc->ctrl_req_addr);
2773}
2774
2775int dwc3_gadget_prepare(struct dwc3 *dwc)
2776{
2777 if (dwc->pullups_connected) {
2778 dwc3_gadget_disable_irq(dwc);
2779 dwc3_gadget_run_stop(dwc, true, true);
2780 }
2781
2782 return 0;
2783}
2784
2785void dwc3_gadget_complete(struct dwc3 *dwc)
2786{
2787 if (dwc->pullups_connected) {
2788 dwc3_gadget_enable_irq(dwc);
2789 dwc3_gadget_run_stop(dwc, true, false);
2790 }
2791}
2792
2793int dwc3_gadget_suspend(struct dwc3 *dwc)
2794{
2795 __dwc3_gadget_ep_disable(dwc->eps[0]);
2796 __dwc3_gadget_ep_disable(dwc->eps[1]);
2797
2798 dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2799
2800 return 0;
2801}
2802
2803int dwc3_gadget_resume(struct dwc3 *dwc)
2804{
2805 struct dwc3_ep *dep;
2806 int ret;
2807
2808 /* Start with SuperSpeed Default */
2809 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2810
2811 dep = dwc->eps[0];
2812 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2813 false);
2814 if (ret)
2815 goto err0;
2816
2817 dep = dwc->eps[1];
2818 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2819 false);
2820 if (ret)
2821 goto err1;
2822
2823 /* begin to receive SETUP packets */
2824 dwc->ep0state = EP0_SETUP_PHASE;
2825 dwc3_ep0_out_start(dwc);
2826
2827 dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2828
2829 return 0;
2830
2831err1:
2832 __dwc3_gadget_ep_disable(dwc->eps[0]);
2833
2834err0:
2835 return ret;
2836}