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usb: dwc3: gadget: always try to prepare on started_list first
[mirror_ubuntu-artful-kernel.git] / drivers / usb / dwc3 / gadget.c
CommitLineData
72246da4
FB		 1/**
2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
72246da4
FB		 5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
5945f789
FB		 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.
72246da4 12 *
5945f789
FB		 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.
72246da4
FB		 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
80977dc9 33#include "debug.h"
72246da4
FB		 34#include "core.h"
35#include "gadget.h"
36#include "io.h"
37
04a9bfcd
FB		 38/**
39 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
40 * @dwc: pointer to our context structure
41 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
42 *
43 * Caller should take care of locking. This function will
44 * return 0 on success or -EINVAL if wrong Test Selector
45 * is passed
46 */
47int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
48{
49 u32 reg;
50
51 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
52 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
53
54 switch (mode) {
55 case TEST_J:
56 case TEST_K:
57 case TEST_SE0_NAK:
58 case TEST_PACKET:
59 case TEST_FORCE_EN:
60 reg |= mode << 1;
61 break;
62 default:
63 return -EINVAL;
64 }
65
66 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
67
68 return 0;
69}
70
911f1f88
PZ		 71/**
72 * dwc3_gadget_get_link_state - Gets current state of USB Link
73 * @dwc: pointer to our context structure
74 *
75 * Caller should take care of locking. This function will
76 * return the link state on success (>= 0) or -ETIMEDOUT.
77 */
78int dwc3_gadget_get_link_state(struct dwc3 *dwc)
79{
80 u32 reg;
81
82 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
83
84 return DWC3_DSTS_USBLNKST(reg);
85}
86
8598bde7
FB		 87/**
88 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
89 * @dwc: pointer to our context structure
90 * @state: the state to put link into
91 *
92 * Caller should take care of locking. This function will
aee63e3c 93 * return 0 on success or -ETIMEDOUT.
8598bde7
FB		 94 */
95int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
96{
aee63e3c 97 int retries = 10000;
8598bde7
FB		 98 u32 reg;
99
802fde98
PZ		 100 /*
101 * Wait until device controller is ready. Only applies to 1.94a and
102 * later RTL.
103 */
104 if (dwc->revision >= DWC3_REVISION_194A) {
105 while (--retries) {
106 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
107 if (reg & DWC3_DSTS_DCNRD)
108 udelay(5);
109 else
110 break;
111 }
112
113 if (retries <= 0)
114 return -ETIMEDOUT;
115 }
116
8598bde7
FB		 117 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
118 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
119
120 /* set requested state */
121 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
122 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
123
802fde98
PZ		 124 /*
125 * The following code is racy when called from dwc3_gadget_wakeup,
126 * and is not needed, at least on newer versions
127 */
128 if (dwc->revision >= DWC3_REVISION_194A)
129 return 0;
130
8598bde7 131 /* wait for a change in DSTS */
aed430e5 132 retries = 10000;
8598bde7
FB		 133 while (--retries) {
134 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
135
8598bde7
FB		 136 if (DWC3_DSTS_USBLNKST(reg) == state)
137 return 0;
138
aee63e3c 139 udelay(5);
8598bde7
FB		 140 }
141
73815280
FB		 142 dwc3_trace(trace_dwc3_gadget,
143 "link state change request timed out");
8598bde7
FB		 144
145 return -ETIMEDOUT;
146}
147
dca0119c
JY		 148/**
149 * dwc3_ep_inc_trb() - Increment a TRB index.
150 * @index - Pointer to the TRB index to increment.
151 *
152 * The index should never point to the link TRB. After incrementing,
153 * if it is point to the link TRB, wrap around to the beginning. The
154 * link TRB is always at the last TRB entry.
155 */
156static void dwc3_ep_inc_trb(u8 *index)
457e84b6 157{
dca0119c
JY		 158 (*index)++;
159 if (*index == (DWC3_TRB_NUM - 1))
160 *index = 0;
ef966b9d 161}
457e84b6 162
dca0119c 163static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
ef966b9d 164{
dca0119c 165 dwc3_ep_inc_trb(&dep->trb_enqueue);
ef966b9d 166}
457e84b6 167
dca0119c 168static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
ef966b9d 169{
dca0119c 170 dwc3_ep_inc_trb(&dep->trb_dequeue);
457e84b6
FB		 171}
172
72246da4
FB		 173void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
174 int status)
175{
176 struct dwc3 *dwc = dep->dwc;
177
737f1ae2 178 req->started = false;
72246da4 179 list_del(&req->list);
eeb720fb 180 req->trb = NULL;
e62c5bc5 181 req->remaining = 0;
72246da4
FB		 182
183 if (req->request.status == -EINPROGRESS)
184 req->request.status = status;
185
0416e494
PA		 186 if (dwc->ep0_bounced && dep->number == 0)
187 dwc->ep0_bounced = false;
188 else
189 usb_gadget_unmap_request(&dwc->gadget, &req->request,
190 req->direction);
72246da4 191
2c4cbe6e 192 trace_dwc3_gadget_giveback(req);
72246da4
FB		 193
194 spin_unlock(&dwc->lock);
304f7e5e 195 usb_gadget_giveback_request(&dep->endpoint, &req->request);
72246da4 196 spin_lock(&dwc->lock);
fc8bb91b
FB		 197
198 if (dep->number > 1)
199 pm_runtime_put(dwc->dev);
72246da4
FB		 200}
201
3ece0ec4 202int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
b09bb642
FB		 203{
204 u32 timeout = 500;
71f7e702 205 int status = 0;
0fe886cd 206 int ret = 0;
b09bb642
FB		 207 u32 reg;
208
209 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
210 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
211
212 do {
213 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
214 if (!(reg & DWC3_DGCMD_CMDACT)) {
71f7e702
FB		 215 status = DWC3_DGCMD_STATUS(reg);
216 if (status)
0fe886cd
FB		 217 ret = -EINVAL;
218 break;
b09bb642 219 }
0fe886cd
FB		 220 } while (timeout--);
221
222 if (!timeout) {
0fe886cd 223 ret = -ETIMEDOUT;
71f7e702 224 status = -ETIMEDOUT;
0fe886cd
FB		 225 }
226
71f7e702
FB		 227 trace_dwc3_gadget_generic_cmd(cmd, param, status);
228
0fe886cd 229 return ret;
b09bb642
FB		 230}
231
c36d8e94
FB		 232static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
233
2cd4718d
FB		 234int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
235 struct dwc3_gadget_ep_cmd_params *params)
72246da4 236{
8897a761 237 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
2cd4718d 238 struct dwc3 *dwc = dep->dwc;
61d58242 239 u32 timeout = 500;
72246da4
FB		 240 u32 reg;
241
0933df15 242 int cmd_status = 0;
2b0f11df 243 int susphy = false;
c0ca324d 244 int ret = -EINVAL;
72246da4 245
2b0f11df
FB		 246 /*
247 * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
248 * we're issuing an endpoint command, we must check if
249 * GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it.
250 *
251 * We will also set SUSPHY bit to what it was before returning as stated
252 * by the same section on Synopsys databook.
253 */
ab2a92e7
FB		 254 if (dwc->gadget.speed <= USB_SPEED_HIGH) {
255 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
256 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
257 susphy = true;
258 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
259 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
260 }
2b0f11df
FB		 261 }
262
5999914f 263 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
c36d8e94
FB		 264 int needs_wakeup;
265
266 needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
267 dwc->link_state == DWC3_LINK_STATE_U2 ||
268 dwc->link_state == DWC3_LINK_STATE_U3);
269
270 if (unlikely(needs_wakeup)) {
271 ret = __dwc3_gadget_wakeup(dwc);
272 dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
273 ret);
274 }
275 }
276
2eb88016
FB		 277 dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
278 dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
279 dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
72246da4 280
8897a761
FB		 281 /*
282 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
283 * not relying on XferNotReady, we can make use of a special "No
284 * Response Update Transfer" command where we should clear both CmdAct
285 * and CmdIOC bits.
286 *
287 * With this, we don't need to wait for command completion and can
288 * straight away issue further commands to the endpoint.
289 *
290 * NOTICE: We're making an assumption that control endpoints will never
291 * make use of Update Transfer command. This is a safe assumption
292 * because we can never have more than one request at a time with
293 * Control Endpoints. If anybody changes that assumption, this chunk
294 * needs to be updated accordingly.
295 */
296 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
297 !usb_endpoint_xfer_isoc(desc))
298 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
299 else
300 cmd |= DWC3_DEPCMD_CMDACT;
301
302 dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
72246da4 303 do {
2eb88016 304 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
72246da4 305 if (!(reg & DWC3_DEPCMD_CMDACT)) {
0933df15 306 cmd_status = DWC3_DEPCMD_STATUS(reg);
7b9cc7a2 307
7b9cc7a2
KL		 308 switch (cmd_status) {
309 case 0:
310 ret = 0;
311 break;
312 case DEPEVT_TRANSFER_NO_RESOURCE:
7b9cc7a2 313 ret = -EINVAL;
c0ca324d 314 break;
7b9cc7a2
KL		 315 case DEPEVT_TRANSFER_BUS_EXPIRY:
316 /*
317 * SW issues START TRANSFER command to
318 * isochronous ep with future frame interval. If
319 * future interval time has already passed when
320 * core receives the command, it will respond
321 * with an error status of 'Bus Expiry'.
322 *
323 * Instead of always returning -EINVAL, let's
324 * give a hint to the gadget driver that this is
325 * the case by returning -EAGAIN.
326 */
7b9cc7a2
KL		 327 ret = -EAGAIN;
328 break;
329 default:
330 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
331 }
332
c0ca324d 333 break;
72246da4 334 }
f6bb225b 335 } while (--timeout);
72246da4 336
f6bb225b 337 if (timeout == 0) {
f6bb225b 338 ret = -ETIMEDOUT;
0933df15 339 cmd_status = -ETIMEDOUT;
f6bb225b 340 }
c0ca324d 341
0933df15
FB		 342 trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
343
6cb2e4e3
FB		 344 if (ret == 0) {
345 switch (DWC3_DEPCMD_CMD(cmd)) {
346 case DWC3_DEPCMD_STARTTRANSFER:
347 dep->flags |= DWC3_EP_TRANSFER_STARTED;
348 break;
349 case DWC3_DEPCMD_ENDTRANSFER:
350 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
351 break;
352 default:
353 /* nothing */
354 break;
355 }
356 }
357
2b0f11df
FB		 358 if (unlikely(susphy)) {
359 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
360 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
361 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
362 }
363
c0ca324d 364 return ret;
72246da4
FB		 365}
366
50c763f8
JY		 367static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
368{
369 struct dwc3 *dwc = dep->dwc;
370 struct dwc3_gadget_ep_cmd_params params;
371 u32 cmd = DWC3_DEPCMD_CLEARSTALL;
372
373 /*
374 * As of core revision 2.60a the recommended programming model
375 * is to set the ClearPendIN bit when issuing a Clear Stall EP
376 * command for IN endpoints. This is to prevent an issue where
377 * some (non-compliant) hosts may not send ACK TPs for pending
378 * IN transfers due to a mishandled error condition. Synopsys
379 * STAR 9000614252.
380 */
5e6c88d2
LB		 381 if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
382 (dwc->gadget.speed >= USB_SPEED_SUPER))
50c763f8
JY		 383 cmd |= DWC3_DEPCMD_CLEARPENDIN;
384
385 memset(&params, 0, sizeof(params));
386
2cd4718d 387 return dwc3_send_gadget_ep_cmd(dep, cmd, &params);
50c763f8
JY		 388}
389
72246da4 390static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
f6bafc6a 391 struct dwc3_trb *trb)
72246da4 392{
c439ef87 393 u32 offset = (char *) trb - (char *) dep->trb_pool;
72246da4
FB		 394
395 return dep->trb_pool_dma + offset;
396}
397
398static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
399{
400 struct dwc3 *dwc = dep->dwc;
401
402 if (dep->trb_pool)
403 return 0;
404
72246da4
FB		 405 dep->trb_pool = dma_alloc_coherent(dwc->dev,
406 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
407 &dep->trb_pool_dma, GFP_KERNEL);
408 if (!dep->trb_pool) {
409 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
410 dep->name);
411 return -ENOMEM;
412 }
413
414 return 0;
415}
416
417static void dwc3_free_trb_pool(struct dwc3_ep *dep)
418{
419 struct dwc3 *dwc = dep->dwc;
420
421 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
422 dep->trb_pool, dep->trb_pool_dma);
423
424 dep->trb_pool = NULL;
425 dep->trb_pool_dma = 0;
426}
427
c4509601
JY		 428static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
429
430/**
431 * dwc3_gadget_start_config - Configure EP resources
432 * @dwc: pointer to our controller context structure
433 * @dep: endpoint that is being enabled
434 *
435 * The assignment of transfer resources cannot perfectly follow the
436 * data book due to the fact that the controller driver does not have
437 * all knowledge of the configuration in advance. It is given this
438 * information piecemeal by the composite gadget framework after every
439 * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
440 * programming model in this scenario can cause errors. For two
441 * reasons:
442 *
443 * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
444 * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
445 * multiple interfaces.
446 *
447 * 2) The databook does not mention doing more DEPXFERCFG for new
448 * endpoint on alt setting (8.1.6).
449 *
450 * The following simplified method is used instead:
451 *
452 * All hardware endpoints can be assigned a transfer resource and this
453 * setting will stay persistent until either a core reset or
454 * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
455 * do DEPXFERCFG for every hardware endpoint as well. We are
456 * guaranteed that there are as many transfer resources as endpoints.
457 *
458 * This function is called for each endpoint when it is being enabled
459 * but is triggered only when called for EP0-out, which always happens
460 * first, and which should only happen in one of the above conditions.
461 */
72246da4
FB		 462static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
463{
464 struct dwc3_gadget_ep_cmd_params params;
465 u32 cmd;
c4509601
JY		 466 int i;
467 int ret;
468
469 if (dep->number)
470 return 0;
72246da4
FB		 471
472 memset(&params, 0x00, sizeof(params));
c4509601 473 cmd = DWC3_DEPCMD_DEPSTARTCFG;
72246da4 474
2cd4718d 475 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
c4509601
JY		 476 if (ret)
477 return ret;
478
479 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
480 struct dwc3_ep *dep = dwc->eps[i];
72246da4 481
c4509601
JY		 482 if (!dep)
483 continue;
484
485 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
486 if (ret)
487 return ret;
72246da4
FB		 488 }
489
490 return 0;
491}
492
493static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
c90bfaec 494 const struct usb_endpoint_descriptor *desc,
4b345c9a 495 const struct usb_ss_ep_comp_descriptor *comp_desc,
21e64bf2 496 bool modify, bool restore)
72246da4
FB		 497{
498 struct dwc3_gadget_ep_cmd_params params;
499
21e64bf2
FB		 500 if (dev_WARN_ONCE(dwc->dev, modify && restore,
501 "Can't modify and restore\n"))
502 return -EINVAL;
503
72246da4
FB		 504 memset(&params, 0x00, sizeof(params));
505
dc1c70a7 506 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
d2e9a13a
CP		 507 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
508
509 /* Burst size is only needed in SuperSpeed mode */
ee5cd41c 510 if (dwc->gadget.speed >= USB_SPEED_SUPER) {
676e3497 511 u32 burst = dep->endpoint.maxburst;
676e3497 512 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
d2e9a13a 513 }
72246da4 514
21e64bf2
FB		 515 if (modify) {
516 params.param0 |= DWC3_DEPCFG_ACTION_MODIFY;
517 } else if (restore) {
265b70a7
PZ		 518 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
519 params.param2 |= dep->saved_state;
21e64bf2
FB		 520 } else {
521 params.param0 |= DWC3_DEPCFG_ACTION_INIT;
265b70a7
PZ		 522 }
523
4bc48c97
FB		 524 if (usb_endpoint_xfer_control(desc))
525 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
13fa2e69
FB		 526
527 if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
528 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
72246da4 529
18b7ede5 530 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
dc1c70a7
FB		 531 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
532 | DWC3_DEPCFG_STREAM_EVENT_EN;
879631aa
FB		 533 dep->stream_capable = true;
534 }
535
0b93a4c8 536 if (!usb_endpoint_xfer_control(desc))
dc1c70a7 537 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
72246da4
FB		 538
539 /*
540 * We are doing 1:1 mapping for endpoints, meaning
541 * Physical Endpoints 2 maps to Logical Endpoint 2 and
542 * so on. We consider the direction bit as part of the physical
543 * endpoint number. So USB endpoint 0x81 is 0x03.
544 */
dc1c70a7 545 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
72246da4
FB		 546
547 /*
548 * We must use the lower 16 TX FIFOs even though
549 * HW might have more
550 */
551 if (dep->direction)
dc1c70a7 552 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
72246da4
FB		 553
554 if (desc->bInterval) {
dc1c70a7 555 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
72246da4
FB		 556 dep->interval = 1 << (desc->bInterval - 1);
557 }
558
2cd4718d 559 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);
72246da4
FB		 560}
561
562static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
563{
564 struct dwc3_gadget_ep_cmd_params params;
565
566 memset(&params, 0x00, sizeof(params));
567
dc1c70a7 568 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
72246da4 569
2cd4718d
FB		 570 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
571 &params);
72246da4
FB		 572}
573
574/**
575 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
576 * @dep: endpoint to be initialized
577 * @desc: USB Endpoint Descriptor
578 *
579 * Caller should take care of locking
580 */
581static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
c90bfaec 582 const struct usb_endpoint_descriptor *desc,
4b345c9a 583 const struct usb_ss_ep_comp_descriptor *comp_desc,
21e64bf2 584 bool modify, bool restore)
72246da4
FB		 585{
586 struct dwc3 *dwc = dep->dwc;
587 u32 reg;
b09e99ee 588 int ret;
72246da4 589
73815280 590 dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name);
ff62d6b6 591
72246da4
FB		 592 if (!(dep->flags & DWC3_EP_ENABLED)) {
593 ret = dwc3_gadget_start_config(dwc, dep);
594 if (ret)
595 return ret;
596 }
597
21e64bf2 598 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, modify,
265b70a7 599 restore);
72246da4
FB		 600 if (ret)
601 return ret;
602
603 if (!(dep->flags & DWC3_EP_ENABLED)) {
f6bafc6a
FB		 604 struct dwc3_trb *trb_st_hw;
605 struct dwc3_trb *trb_link;
72246da4 606
16e78db7 607 dep->endpoint.desc = desc;
c90bfaec 608 dep->comp_desc = comp_desc;
72246da4
FB		 609 dep->type = usb_endpoint_type(desc);
610 dep->flags |= DWC3_EP_ENABLED;
76a638f8 611 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
72246da4
FB		 612
613 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
614 reg |= DWC3_DALEPENA_EP(dep->number);
615 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
616
76a638f8
BW		 617 init_waitqueue_head(&dep->wait_end_transfer);
618
36b68aae 619 if (usb_endpoint_xfer_control(desc))
7ab373aa 620 return 0;
72246da4 621
0d25744a
JY		 622 /* Initialize the TRB ring */
623 dep->trb_dequeue = 0;
624 dep->trb_enqueue = 0;
625 memset(dep->trb_pool, 0,
626 sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
627
36b68aae 628 /* Link TRB. The HWO bit is never reset */
72246da4
FB		 629 trb_st_hw = &dep->trb_pool[0];
630
f6bafc6a 631 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
f6bafc6a
FB		 632 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
633 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
634 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
635 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
72246da4
FB		 636 }
637
a97ea994
FB		 638 /*
639 * Issue StartTransfer here with no-op TRB so we can always rely on No
640 * Response Update Transfer command.
641 */
642 if (usb_endpoint_xfer_bulk(desc)) {
643 struct dwc3_gadget_ep_cmd_params params;
644 struct dwc3_trb *trb;
645 dma_addr_t trb_dma;
646 u32 cmd;
647
648 memset(&params, 0, sizeof(params));
649 trb = &dep->trb_pool[0];
650 trb_dma = dwc3_trb_dma_offset(dep, trb);
651
652 params.param0 = upper_32_bits(trb_dma);
653 params.param1 = lower_32_bits(trb_dma);
654
655 cmd = DWC3_DEPCMD_STARTTRANSFER;
656
657 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
658 if (ret < 0)
659 return ret;
660
661 dep->flags |= DWC3_EP_BUSY;
662
663 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
664 WARN_ON_ONCE(!dep->resource_index);
665 }
666
72246da4
FB		 667 return 0;
668}
669
b992e681 670static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
624407f9 671static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
72246da4
FB		 672{
673 struct dwc3_request *req;
674
0e146028 675 dwc3_stop_active_transfer(dwc, dep->number, true);
624407f9 676
0e146028
FB		 677 /* - giveback all requests to gadget driver */
678 while (!list_empty(&dep->started_list)) {
679 req = next_request(&dep->started_list);
1591633e 680
0e146028 681 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
ea53b882
FB		 682 }
683
aa3342c8
FB		 684 while (!list_empty(&dep->pending_list)) {
685 req = next_request(&dep->pending_list);
72246da4 686
624407f9 687 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
72246da4 688 }
72246da4
FB		 689}
690
691/**
692 * __dwc3_gadget_ep_disable - Disables a HW endpoint
693 * @dep: the endpoint to disable
694 *
624407f9
SAS		 695 * This function also removes requests which are currently processed ny the
696 * hardware and those which are not yet scheduled.
697 * Caller should take care of locking.
72246da4 698 */
72246da4
FB		 699static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
700{
701 struct dwc3 *dwc = dep->dwc;
702 u32 reg;
703
7eaeac5c
FB		 704 dwc3_trace(trace_dwc3_gadget, "Disabling %s", dep->name);
705
624407f9 706 dwc3_remove_requests(dwc, dep);
72246da4 707
687ef981
FB		 708 /* make sure HW endpoint isn't stalled */
709 if (dep->flags & DWC3_EP_STALL)
7a608559 710 __dwc3_gadget_ep_set_halt(dep, 0, false);
687ef981 711
72246da4
FB		 712 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
713 reg &= ~DWC3_DALEPENA_EP(dep->number);
714 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
715
879631aa 716 dep->stream_capable = false;
f9c56cdd 717 dep->endpoint.desc = NULL;
c90bfaec 718 dep->comp_desc = NULL;
72246da4 719 dep->type = 0;
76a638f8 720 dep->flags &= DWC3_EP_END_TRANSFER_PENDING;
72246da4
FB		 721
722 return 0;
723}
724
725/* -------------------------------------------------------------------------- */
726
727static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
728 const struct usb_endpoint_descriptor *desc)
729{
730 return -EINVAL;
731}
732
733static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
734{
735 return -EINVAL;
736}
737
738/* -------------------------------------------------------------------------- */
739
740static int dwc3_gadget_ep_enable(struct usb_ep *ep,
741 const struct usb_endpoint_descriptor *desc)
742{
743 struct dwc3_ep *dep;
744 struct dwc3 *dwc;
745 unsigned long flags;
746 int ret;
747
748 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
749 pr_debug("dwc3: invalid parameters\n");
750 return -EINVAL;
751 }
752
753 if (!desc->wMaxPacketSize) {
754 pr_debug("dwc3: missing wMaxPacketSize\n");
755 return -EINVAL;
756 }
757
758 dep = to_dwc3_ep(ep);
759 dwc = dep->dwc;
760
95ca961c
FB		 761 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
762 "%s is already enabled\n",
763 dep->name))
c6f83f38 764 return 0;
c6f83f38 765
72246da4 766 spin_lock_irqsave(&dwc->lock, flags);
265b70a7 767 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
72246da4
FB		 768 spin_unlock_irqrestore(&dwc->lock, flags);
769
770 return ret;
771}
772
773static int dwc3_gadget_ep_disable(struct usb_ep *ep)
774{
775 struct dwc3_ep *dep;
776 struct dwc3 *dwc;
777 unsigned long flags;
778 int ret;
779
780 if (!ep) {
781 pr_debug("dwc3: invalid parameters\n");
782 return -EINVAL;
783 }
784
785 dep = to_dwc3_ep(ep);
786 dwc = dep->dwc;
787
95ca961c
FB		 788 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
789 "%s is already disabled\n",
790 dep->name))
72246da4 791 return 0;
72246da4 792
72246da4
FB		 793 spin_lock_irqsave(&dwc->lock, flags);
794 ret = __dwc3_gadget_ep_disable(dep);
795 spin_unlock_irqrestore(&dwc->lock, flags);
796
797 return ret;
798}
799
800static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
801 gfp_t gfp_flags)
802{
803 struct dwc3_request *req;
804 struct dwc3_ep *dep = to_dwc3_ep(ep);
72246da4
FB		 805
806 req = kzalloc(sizeof(*req), gfp_flags);
734d5a53 807 if (!req)
72246da4 808 return NULL;
72246da4
FB		 809
810 req->epnum = dep->number;
811 req->dep = dep;
72246da4 812
68d34c8a
FB		 813 dep->allocated_requests++;
814
2c4cbe6e
FB		 815 trace_dwc3_alloc_request(req);
816
72246da4
FB		 817 return &req->request;
818}
819
820static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
821 struct usb_request *request)
822{
823 struct dwc3_request *req = to_dwc3_request(request);
68d34c8a 824 struct dwc3_ep *dep = to_dwc3_ep(ep);
72246da4 825
68d34c8a 826 dep->allocated_requests--;
2c4cbe6e 827 trace_dwc3_free_request(req);
72246da4
FB		 828 kfree(req);
829}
830
2c78c029
FB		 831static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep);
832
c71fc37c
FB		 833/**
834 * dwc3_prepare_one_trb - setup one TRB from one request
835 * @dep: endpoint for which this request is prepared
836 * @req: dwc3_request pointer
837 */
68e823e2 838static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
eeb720fb 839 struct dwc3_request *req, dma_addr_t dma,
4bc48c97 840 unsigned length, unsigned chain, unsigned node)
c71fc37c 841{
f6bafc6a 842 struct dwc3_trb *trb;
6b9018d4
FB		 843 struct dwc3 *dwc = dep->dwc;
844 struct usb_gadget *gadget = &dwc->gadget;
845 enum usb_device_speed speed = gadget->speed;
c71fc37c 846
4faf7550 847 trb = &dep->trb_pool[dep->trb_enqueue];
c71fc37c 848
eeb720fb 849 if (!req->trb) {
aa3342c8 850 dwc3_gadget_move_started_request(req);
f6bafc6a
FB		 851 req->trb = trb;
852 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
a9c3ca5f 853 dep->queued_requests++;
eeb720fb 854 }
c71fc37c 855
ef966b9d 856 dwc3_ep_inc_enq(dep);
e5ba5ec8 857
f6bafc6a
FB		 858 trb->size = DWC3_TRB_SIZE_LENGTH(length);
859 trb->bpl = lower_32_bits(dma);
860 trb->bph = upper_32_bits(dma);
c71fc37c 861
16e78db7 862 switch (usb_endpoint_type(dep->endpoint.desc)) {
c71fc37c 863 case USB_ENDPOINT_XFER_CONTROL:
f6bafc6a 864 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
c71fc37c
FB		 865 break;
866
867 case USB_ENDPOINT_XFER_ISOC:
6b9018d4 868 if (!node) {
e5ba5ec8 869 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
6b9018d4
FB		 870
871 if (speed == USB_SPEED_HIGH) {
872 struct usb_ep *ep = &dep->endpoint;
873 trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
874 }
875 } else {
e5ba5ec8 876 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
6b9018d4 877 }
ca4d44ea
FB		 878
879 /* always enable Interrupt on Missed ISOC */
880 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
c71fc37c
FB		 881 break;
882
883 case USB_ENDPOINT_XFER_BULK:
884 case USB_ENDPOINT_XFER_INT:
f6bafc6a 885 trb->ctrl = DWC3_TRBCTL_NORMAL;
c71fc37c
FB		 886 break;
887 default:
888 /*
889 * This is only possible with faulty memory because we
890 * checked it already :)
891 */
0a695d4c
FB		 892 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
893 usb_endpoint_type(dep->endpoint.desc));
c71fc37c
FB		 894 }
895
ca4d44ea 896 /* always enable Continue on Short Packet */
c9508c8c 897 if (usb_endpoint_dir_out(dep->endpoint.desc)) {
58f29034 898 trb->ctrl |= DWC3_TRB_CTRL_CSP;
f3af3651 899
c9508c8c
FB		 900 if (req->request.short_not_ok)
901 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
902 }
903
2c78c029
FB		 904 if ((!req->request.no_interrupt && !chain) ||
905 (dwc3_calc_trbs_left(dep) == 0))
c9508c8c 906 trb->ctrl |= DWC3_TRB_CTRL_IOC;
f3af3651 907
e5ba5ec8
PA		 908 if (chain)
909 trb->ctrl |= DWC3_TRB_CTRL_CHN;
910
16e78db7 911 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
f6bafc6a 912 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
c71fc37c 913
f6bafc6a 914 trb->ctrl |= DWC3_TRB_CTRL_HWO;
2c4cbe6e
FB		 915
916 trace_dwc3_prepare_trb(dep, trb);
c71fc37c
FB		 917}
918
361572b5
JY		 919/**
920 * dwc3_ep_prev_trb() - Returns the previous TRB in the ring
921 * @dep: The endpoint with the TRB ring
922 * @index: The index of the current TRB in the ring
923 *
924 * Returns the TRB prior to the one pointed to by the index. If the
925 * index is 0, we will wrap backwards, skip the link TRB, and return
926 * the one just before that.
927 */
928static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
929{
45438a0c 930 u8 tmp = index;
361572b5 931
45438a0c
FB		 932 if (!tmp)
933 tmp = DWC3_TRB_NUM - 1;
361572b5 934
45438a0c 935 return &dep->trb_pool[tmp - 1];
361572b5
JY		 936}
937
c4233573
FB		 938static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
939{
940 struct dwc3_trb *tmp;
32db3d94 941 u8 trbs_left;
c4233573
FB		 942
943 /*
944 * If enqueue & dequeue are equal than it is either full or empty.
945 *
946 * One way to know for sure is if the TRB right before us has HWO bit
947 * set or not. If it has, then we're definitely full and can't fit any
948 * more transfers in our ring.
949 */
950 if (dep->trb_enqueue == dep->trb_dequeue) {
361572b5
JY		 951 tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
952 if (tmp->ctrl & DWC3_TRB_CTRL_HWO)
953 return 0;
c4233573
FB		 954
955 return DWC3_TRB_NUM - 1;
956 }
957
9d7aba77 958 trbs_left = dep->trb_dequeue - dep->trb_enqueue;
3de2685f 959 trbs_left &= (DWC3_TRB_NUM - 1);
32db3d94 960
9d7aba77
JY		 961 if (dep->trb_dequeue < dep->trb_enqueue)
962 trbs_left--;
963
32db3d94 964 return trbs_left;
c4233573
FB		 965}
966
5ee85d89 967static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
7ae7df49 968 struct dwc3_request *req)
5ee85d89 969{
1f512119 970 struct scatterlist *sg = req->sg;
5ee85d89 971 struct scatterlist *s;
5ee85d89
FB		 972 unsigned int length;
973 dma_addr_t dma;
974 int i;
975
1f512119 976 for_each_sg(sg, s, req->num_pending_sgs, i) {
5ee85d89
FB		 977 unsigned chain = true;
978
979 length = sg_dma_len(s);
980 dma = sg_dma_address(s);
981
4bc48c97 982 if (sg_is_last(s))
5ee85d89
FB		 983 chain = false;
984
985 dwc3_prepare_one_trb(dep, req, dma, length,
4bc48c97 986 chain, i);
5ee85d89 987
7ae7df49 988 if (!dwc3_calc_trbs_left(dep))
5ee85d89
FB		 989 break;
990 }
991}
992
993static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
7ae7df49 994 struct dwc3_request *req)
5ee85d89 995{
5ee85d89
FB		 996 unsigned int length;
997 dma_addr_t dma;
998
999 dma = req->request.dma;
1000 length = req->request.length;
1001
5ee85d89 1002 dwc3_prepare_one_trb(dep, req, dma, length,
4bc48c97 1003 false, 0);
5ee85d89
FB		 1004}
1005
72246da4
FB		 1006/*
1007 * dwc3_prepare_trbs - setup TRBs from requests
1008 * @dep: endpoint for which requests are being prepared
72246da4 1009 *
1d046793
PZ		 1010 * The function goes through the requests list and sets up TRBs for the
1011 * transfers. The function returns once there are no more TRBs available or
1012 * it runs out of requests.
72246da4 1013 */
c4233573 1014static void dwc3_prepare_trbs(struct dwc3_ep *dep)
72246da4 1015{
68e823e2 1016 struct dwc3_request *req, *n;
72246da4
FB		 1017
1018 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1019
7ae7df49 1020 if (!dwc3_calc_trbs_left(dep))
89bc856e 1021 return;
72246da4 1022
d86c5a67
FB		 1023 /*
1024 * We can get in a situation where there's a request in the started list
1025 * but there weren't enough TRBs to fully kick it in the first time
1026 * around, so it has been waiting for more TRBs to be freed up.
1027 *
1028 * In that case, we should check if we have a request with pending_sgs
1029 * in the started list and prepare TRBs for that request first,
1030 * otherwise we will prepare TRBs completely out of order and that will
1031 * break things.
1032 */
1033 list_for_each_entry(req, &dep->started_list, list) {
1034 if (req->num_pending_sgs > 0)
1035 dwc3_prepare_one_trb_sg(dep, req);
1036
1037 if (!dwc3_calc_trbs_left(dep))
1038 return;
1039 }
1040
aa3342c8 1041 list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1f512119 1042 if (req->num_pending_sgs > 0)
7ae7df49 1043 dwc3_prepare_one_trb_sg(dep, req);
5ee85d89 1044 else
7ae7df49 1045 dwc3_prepare_one_trb_linear(dep, req);
72246da4 1046
7ae7df49 1047 if (!dwc3_calc_trbs_left(dep))
5ee85d89 1048 return;
72246da4 1049 }
72246da4
FB		 1050}
1051
4fae2e3e 1052static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
72246da4
FB		 1053{
1054 struct dwc3_gadget_ep_cmd_params params;
1055 struct dwc3_request *req;
4fae2e3e 1056 int starting;
72246da4
FB		 1057 int ret;
1058 u32 cmd;
1059
4fae2e3e 1060 starting = !(dep->flags & DWC3_EP_BUSY);
72246da4 1061
4fae2e3e
FB		 1062 dwc3_prepare_trbs(dep);
1063 req = next_request(&dep->started_list);
72246da4
FB		 1064 if (!req) {
1065 dep->flags |= DWC3_EP_PENDING_REQUEST;
1066 return 0;
1067 }
1068
1069 memset(&params, 0, sizeof(params));
72246da4 1070
4fae2e3e 1071 if (starting) {
1877d6c9
PA		 1072 params.param0 = upper_32_bits(req->trb_dma);
1073 params.param1 = lower_32_bits(req->trb_dma);
b6b1c6db
FB		 1074 cmd = DWC3_DEPCMD_STARTTRANSFER |
1075 DWC3_DEPCMD_PARAM(cmd_param);
1877d6c9 1076 } else {
b6b1c6db
FB		 1077 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1078 DWC3_DEPCMD_PARAM(dep->resource_index);
1877d6c9 1079 }
72246da4 1080
2cd4718d 1081 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
72246da4 1082 if (ret < 0) {
72246da4
FB		 1083 /*
1084 * FIXME we need to iterate over the list of requests
1085 * here and stop, unmap, free and del each of the linked
1d046793 1086 * requests instead of what we do now.
72246da4 1087 */
15b8d933 1088 dwc3_gadget_giveback(dep, req, ret);
72246da4
FB		 1089 return ret;
1090 }
1091
1092 dep->flags |= DWC3_EP_BUSY;
25b8ff68 1093
4fae2e3e 1094 if (starting) {
2eb88016 1095 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
b4996a86 1096 WARN_ON_ONCE(!dep->resource_index);
f898ae09 1097 }
25b8ff68 1098
72246da4
FB		 1099 return 0;
1100}
1101
6cb2e4e3
FB		 1102static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1103{
1104 u32 reg;
1105
1106 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1107 return DWC3_DSTS_SOFFN(reg);
1108}
1109
d6d6ec7b
PA		 1110static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1111 struct dwc3_ep *dep, u32 cur_uf)
1112{
1113 u32 uf;
1114
aa3342c8 1115 if (list_empty(&dep->pending_list)) {
73815280
FB		 1116 dwc3_trace(trace_dwc3_gadget,
1117 "ISOC ep %s run out for requests",
1118 dep->name);
f4a53c55 1119 dep->flags |= DWC3_EP_PENDING_REQUEST;
d6d6ec7b
PA		 1120 return;
1121 }
1122
1123 /* 4 micro frames in the future */
1124 uf = cur_uf + dep->interval * 4;
1125
4fae2e3e 1126 __dwc3_gadget_kick_transfer(dep, uf);
d6d6ec7b
PA		 1127}
1128
1129static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1130 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1131{
1132 u32 cur_uf, mask;
1133
1134 mask = ~(dep->interval - 1);
1135 cur_uf = event->parameters & mask;
1136
1137 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1138}
1139
72246da4
FB		 1140static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1141{
0fc9a1be
FB		 1142 struct dwc3 *dwc = dep->dwc;
1143 int ret;
1144
bb423984 1145 if (!dep->endpoint.desc) {
ec5e795c 1146 dwc3_trace(trace_dwc3_gadget,
60cfb37a 1147 "trying to queue request %p to disabled %s",
bb423984
FB		 1148 &req->request, dep->endpoint.name);
1149 return -ESHUTDOWN;
1150 }
1151
1152 if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1153 &req->request, req->dep->name)) {
60cfb37a 1154 dwc3_trace(trace_dwc3_gadget, "request %p belongs to '%s'",
ec5e795c 1155 &req->request, req->dep->name);
bb423984
FB		 1156 return -EINVAL;
1157 }
1158
fc8bb91b
FB		 1159 pm_runtime_get(dwc->dev);
1160
72246da4
FB		 1161 req->request.actual = 0;
1162 req->request.status = -EINPROGRESS;
1163 req->direction = dep->direction;
1164 req->epnum = dep->number;
1165
fe84f522
FB		 1166 trace_dwc3_ep_queue(req);
1167
0fc9a1be
FB		 1168 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1169 dep->direction);
1170 if (ret)
1171 return ret;
1172
1f512119
FB		 1173 req->sg = req->request.sg;
1174 req->num_pending_sgs = req->request.num_mapped_sgs;
89185916 1175
aa3342c8 1176 list_add_tail(&req->list, &dep->pending_list);
72246da4 1177
d889c23c
FB		 1178 /*
1179 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1180 * wait for a XferNotReady event so we will know what's the current
1181 * (micro-)frame number.
1182 *
1183 * Without this trick, we are very, very likely gonna get Bus Expiry
1184 * errors which will force us issue EndTransfer command.
1185 */
1186 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
6cb2e4e3
FB		 1187 if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
1188 if (dep->flags & DWC3_EP_TRANSFER_STARTED) {
1189 dwc3_stop_active_transfer(dwc, dep->number, true);
1190 dep->flags = DWC3_EP_ENABLED;
1191 } else {
1192 u32 cur_uf;
1193
1194 cur_uf = __dwc3_gadget_get_frame(dwc);
1195 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1196 }
08a36b54
FB		 1197 }
1198 return 0;
a0925324 1199 }
72246da4 1200
594e121f
FB		 1201 if (!dwc3_calc_trbs_left(dep))
1202 return 0;
b997ada5 1203
08a36b54 1204 ret = __dwc3_gadget_kick_transfer(dep, 0);
a8f32817 1205 if (ret && ret != -EBUSY)
ec5e795c 1206 dwc3_trace(trace_dwc3_gadget,
60cfb37a 1207 "%s: failed to kick transfers",
a8f32817
FB		 1208 dep->name);
1209 if (ret == -EBUSY)
1210 ret = 0;
1211
1212 return ret;
72246da4
FB		 1213}
1214
04c03d10
FB		 1215static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep,
1216 struct usb_request *request)
1217{
1218 dwc3_gadget_ep_free_request(ep, request);
1219}
1220
1221static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep)
1222{
1223 struct dwc3_request *req;
1224 struct usb_request *request;
1225 struct usb_ep *ep = &dep->endpoint;
1226
60cfb37a 1227 dwc3_trace(trace_dwc3_gadget, "queueing ZLP");
04c03d10
FB		 1228 request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
1229 if (!request)
1230 return -ENOMEM;
1231
1232 request->length = 0;
1233 request->buf = dwc->zlp_buf;
1234 request->complete = __dwc3_gadget_ep_zlp_complete;
1235
1236 req = to_dwc3_request(request);
1237
1238 return __dwc3_gadget_ep_queue(dep, req);
1239}
1240
72246da4
FB		 1241static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1242 gfp_t gfp_flags)
1243{
1244 struct dwc3_request *req = to_dwc3_request(request);
1245 struct dwc3_ep *dep = to_dwc3_ep(ep);
1246 struct dwc3 *dwc = dep->dwc;
1247
1248 unsigned long flags;
1249
1250 int ret;
1251
fdee4eba 1252 spin_lock_irqsave(&dwc->lock, flags);
72246da4 1253 ret = __dwc3_gadget_ep_queue(dep, req);
04c03d10
FB		 1254
1255 /*
1256 * Okay, here's the thing, if gadget driver has requested for a ZLP by
1257 * setting request->zero, instead of doing magic, we will just queue an
1258 * extra usb_request ourselves so that it gets handled the same way as
1259 * any other request.
1260 */
d9261898
JY		 1261 if (ret == 0 && request->zero && request->length &&
1262 (request->length % ep->maxpacket == 0))
04c03d10
FB		 1263 ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
1264
72246da4
FB		 1265 spin_unlock_irqrestore(&dwc->lock, flags);
1266
1267 return ret;
1268}
1269
1270static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1271 struct usb_request *request)
1272{
1273 struct dwc3_request *req = to_dwc3_request(request);
1274 struct dwc3_request *r = NULL;
1275
1276 struct dwc3_ep *dep = to_dwc3_ep(ep);
1277 struct dwc3 *dwc = dep->dwc;
1278
1279 unsigned long flags;
1280 int ret = 0;
1281
2c4cbe6e
FB		 1282 trace_dwc3_ep_dequeue(req);
1283
72246da4
FB		 1284 spin_lock_irqsave(&dwc->lock, flags);
1285
aa3342c8 1286 list_for_each_entry(r, &dep->pending_list, list) {
72246da4
FB		 1287 if (r == req)
1288 break;
1289 }
1290
1291 if (r != req) {
aa3342c8 1292 list_for_each_entry(r, &dep->started_list, list) {
72246da4
FB		 1293 if (r == req)
1294 break;
1295 }
1296 if (r == req) {
1297 /* wait until it is processed */
b992e681 1298 dwc3_stop_active_transfer(dwc, dep->number, true);
e8d4e8be 1299 goto out1;
72246da4
FB		 1300 }
1301 dev_err(dwc->dev, "request %p was not queued to %s\n",
1302 request, ep->name);
1303 ret = -EINVAL;
1304 goto out0;
1305 }
1306
e8d4e8be 1307out1:
72246da4
FB		 1308 /* giveback the request */
1309 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1310
1311out0:
1312 spin_unlock_irqrestore(&dwc->lock, flags);
1313
1314 return ret;
1315}
1316
7a608559 1317int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
72246da4
FB		 1318{
1319 struct dwc3_gadget_ep_cmd_params params;
1320 struct dwc3 *dwc = dep->dwc;
1321 int ret;
1322
5ad02fb8
FB		 1323 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1324 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1325 return -EINVAL;
1326 }
1327
72246da4
FB		 1328 memset(&params, 0x00, sizeof(params));
1329
1330 if (value) {
69450c4d
FB		 1331 struct dwc3_trb *trb;
1332
1333 unsigned transfer_in_flight;
1334 unsigned started;
1335
1336 if (dep->number > 1)
1337 trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
1338 else
1339 trb = &dwc->ep0_trb[dep->trb_enqueue];
1340
1341 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
1342 started = !list_empty(&dep->started_list);
1343
1344 if (!protocol && ((dep->direction && transfer_in_flight) ||
1345 (!dep->direction && started))) {
ec5e795c 1346 dwc3_trace(trace_dwc3_gadget,
052ba52e 1347 "%s: pending request, cannot halt",
7a608559
FB		 1348 dep->name);
1349 return -EAGAIN;
1350 }
1351
2cd4718d
FB		 1352 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
1353 &params);
72246da4 1354 if (ret)
3f89204b 1355 dev_err(dwc->dev, "failed to set STALL on %s\n",
72246da4
FB		 1356 dep->name);
1357 else
1358 dep->flags |= DWC3_EP_STALL;
1359 } else {
2cd4718d 1360
50c763f8 1361 ret = dwc3_send_clear_stall_ep_cmd(dep);
72246da4 1362 if (ret)
3f89204b 1363 dev_err(dwc->dev, "failed to clear STALL on %s\n",
72246da4
FB		 1364 dep->name);
1365 else
a535d81c 1366 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
72246da4 1367 }
5275455a 1368
72246da4
FB		 1369 return ret;
1370}
1371
1372static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1373{
1374 struct dwc3_ep *dep = to_dwc3_ep(ep);
1375 struct dwc3 *dwc = dep->dwc;
1376
1377 unsigned long flags;
1378
1379 int ret;
1380
1381 spin_lock_irqsave(&dwc->lock, flags);
7a608559 1382 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
72246da4
FB		 1383 spin_unlock_irqrestore(&dwc->lock, flags);
1384
1385 return ret;
1386}
1387
1388static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1389{
1390 struct dwc3_ep *dep = to_dwc3_ep(ep);
249a4569
PZ		 1391 struct dwc3 *dwc = dep->dwc;
1392 unsigned long flags;
95aa4e8d 1393 int ret;
72246da4 1394
249a4569 1395 spin_lock_irqsave(&dwc->lock, flags);
72246da4
FB		 1396 dep->flags |= DWC3_EP_WEDGE;
1397
08f0d966 1398 if (dep->number == 0 || dep->number == 1)
95aa4e8d 1399 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
08f0d966 1400 else
7a608559 1401 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
95aa4e8d
FB		 1402 spin_unlock_irqrestore(&dwc->lock, flags);
1403
1404 return ret;
72246da4
FB		 1405}
1406
1407/* -------------------------------------------------------------------------- */
1408
1409static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1410 .bLength = USB_DT_ENDPOINT_SIZE,
1411 .bDescriptorType = USB_DT_ENDPOINT,
1412 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1413};
1414
1415static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1416 .enable = dwc3_gadget_ep0_enable,
1417 .disable = dwc3_gadget_ep0_disable,
1418 .alloc_request = dwc3_gadget_ep_alloc_request,
1419 .free_request = dwc3_gadget_ep_free_request,
1420 .queue = dwc3_gadget_ep0_queue,
1421 .dequeue = dwc3_gadget_ep_dequeue,
08f0d966 1422 .set_halt = dwc3_gadget_ep0_set_halt,
72246da4
FB		 1423 .set_wedge = dwc3_gadget_ep_set_wedge,
1424};
1425
1426static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1427 .enable = dwc3_gadget_ep_enable,
1428 .disable = dwc3_gadget_ep_disable,
1429 .alloc_request = dwc3_gadget_ep_alloc_request,
1430 .free_request = dwc3_gadget_ep_free_request,
1431 .queue = dwc3_gadget_ep_queue,
1432 .dequeue = dwc3_gadget_ep_dequeue,
1433 .set_halt = dwc3_gadget_ep_set_halt,
1434 .set_wedge = dwc3_gadget_ep_set_wedge,
1435};
1436
1437/* -------------------------------------------------------------------------- */
1438
1439static int dwc3_gadget_get_frame(struct usb_gadget *g)
1440{
1441 struct dwc3 *dwc = gadget_to_dwc(g);
72246da4 1442
6cb2e4e3 1443 return __dwc3_gadget_get_frame(dwc);
72246da4
FB		 1444}
1445
218ef7b6 1446static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
72246da4 1447{
d6011f6f 1448 int retries;
72246da4 1449
218ef7b6 1450 int ret;
72246da4
FB		 1451 u32 reg;
1452
72246da4
FB		 1453 u8 link_state;
1454 u8 speed;
1455
72246da4
FB		 1456 /*
1457 * According to the Databook Remote wakeup request should
1458 * be issued only when the device is in early suspend state.
1459 *
1460 * We can check that via USB Link State bits in DSTS register.
1461 */
1462 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1463
1464 speed = reg & DWC3_DSTS_CONNECTSPD;
ee5cd41c
JY		 1465 if ((speed == DWC3_DSTS_SUPERSPEED) ||
1466 (speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
60cfb37a 1467 dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed");
6b742899 1468 return 0;
72246da4
FB		 1469 }
1470
1471 link_state = DWC3_DSTS_USBLNKST(reg);
1472
1473 switch (link_state) {
1474 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1475 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1476 break;
1477 default:
ec5e795c 1478 dwc3_trace(trace_dwc3_gadget,
60cfb37a 1479 "can't wakeup from '%s'",
ec5e795c 1480 dwc3_gadget_link_string(link_state));
218ef7b6 1481 return -EINVAL;
72246da4
FB		 1482 }
1483
8598bde7
FB		 1484 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1485 if (ret < 0) {
1486 dev_err(dwc->dev, "failed to put link in Recovery\n");
218ef7b6 1487 return ret;
8598bde7 1488 }
72246da4 1489
802fde98
PZ		 1490 /* Recent versions do this automatically */
1491 if (dwc->revision < DWC3_REVISION_194A) {
1492 /* write zeroes to Link Change Request */
fcc023c7 1493 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
802fde98
PZ		 1494 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1495 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1496 }
72246da4 1497
1d046793 1498 /* poll until Link State changes to ON */
d6011f6f 1499 retries = 20000;
72246da4 1500
d6011f6f 1501 while (retries--) {
72246da4
FB		 1502 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1503
1504 /* in HS, means ON */
1505 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1506 break;
1507 }
1508
1509 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1510 dev_err(dwc->dev, "failed to send remote wakeup\n");
218ef7b6 1511 return -EINVAL;
72246da4
FB		 1512 }
1513
218ef7b6
FB		 1514 return 0;
1515}
1516
1517static int dwc3_gadget_wakeup(struct usb_gadget *g)
1518{
1519 struct dwc3 *dwc = gadget_to_dwc(g);
1520 unsigned long flags;
1521 int ret;
1522
1523 spin_lock_irqsave(&dwc->lock, flags);
1524 ret = __dwc3_gadget_wakeup(dwc);
72246da4
FB		 1525 spin_unlock_irqrestore(&dwc->lock, flags);
1526
1527 return ret;
1528}
1529
1530static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1531 int is_selfpowered)
1532{
1533 struct dwc3 *dwc = gadget_to_dwc(g);
249a4569 1534 unsigned long flags;
72246da4 1535
249a4569 1536 spin_lock_irqsave(&dwc->lock, flags);
bcdea503 1537 g->is_selfpowered = !!is_selfpowered;
249a4569 1538 spin_unlock_irqrestore(&dwc->lock, flags);
72246da4
FB		 1539
1540 return 0;
1541}
1542
7b2a0368 1543static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
72246da4
FB		 1544{
1545 u32 reg;
61d58242 1546 u32 timeout = 500;
72246da4 1547
fc8bb91b
FB		 1548 if (pm_runtime_suspended(dwc->dev))
1549 return 0;
1550
72246da4 1551 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
8db7ed15 1552 if (is_on) {
802fde98
PZ		 1553 if (dwc->revision <= DWC3_REVISION_187A) {
1554 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1555 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1556 }
1557
1558 if (dwc->revision >= DWC3_REVISION_194A)
1559 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1560 reg |= DWC3_DCTL_RUN_STOP;
7b2a0368
FB		 1561
1562 if (dwc->has_hibernation)
1563 reg |= DWC3_DCTL_KEEP_CONNECT;
1564
9fcb3bd8 1565 dwc->pullups_connected = true;
8db7ed15 1566 } else {
72246da4 1567 reg &= ~DWC3_DCTL_RUN_STOP;
7b2a0368
FB		 1568
1569 if (dwc->has_hibernation && !suspend)
1570 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1571
9fcb3bd8 1572 dwc->pullups_connected = false;
8db7ed15 1573 }
72246da4
FB		 1574
1575 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1576
1577 do {
1578 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
b6d4e16e
FB		 1579 reg &= DWC3_DSTS_DEVCTRLHLT;
1580 } while (--timeout && !(!is_on ^ !reg));
f2df679b
FB		 1581
1582 if (!timeout)
1583 return -ETIMEDOUT;
72246da4 1584
73815280 1585 dwc3_trace(trace_dwc3_gadget, "gadget %s data soft-%s",
72246da4
FB		 1586 dwc->gadget_driver
1587 ? dwc->gadget_driver->function : "no-function",
1588 is_on ? "connect" : "disconnect");
6f17f74b
PA		 1589
1590 return 0;
72246da4
FB		 1591}
1592
1593static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1594{
1595 struct dwc3 *dwc = gadget_to_dwc(g);
1596 unsigned long flags;
6f17f74b 1597 int ret;
72246da4
FB		 1598
1599 is_on = !!is_on;
1600
bb014736
BW		 1601 /*
1602 * Per databook, when we want to stop the gadget, if a control transfer
1603 * is still in process, complete it and get the core into setup phase.
1604 */
1605 if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
1606 reinit_completion(&dwc->ep0_in_setup);
1607
1608 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
1609 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
1610 if (ret == 0) {
1611 dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
1612 return -ETIMEDOUT;
1613 }
1614 }
1615
72246da4 1616 spin_lock_irqsave(&dwc->lock, flags);
7b2a0368 1617 ret = dwc3_gadget_run_stop(dwc, is_on, false);
72246da4
FB		 1618 spin_unlock_irqrestore(&dwc->lock, flags);
1619
6f17f74b 1620 return ret;
72246da4
FB		 1621}
1622
8698e2ac
FB		 1623static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1624{
1625 u32 reg;
1626
1627 /* Enable all but Start and End of Frame IRQs */
1628 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1629 DWC3_DEVTEN_EVNTOVERFLOWEN |
1630 DWC3_DEVTEN_CMDCMPLTEN |
1631 DWC3_DEVTEN_ERRTICERREN |
1632 DWC3_DEVTEN_WKUPEVTEN |
8698e2ac
FB		 1633 DWC3_DEVTEN_CONNECTDONEEN |
1634 DWC3_DEVTEN_USBRSTEN |
1635 DWC3_DEVTEN_DISCONNEVTEN);
1636
799e9dc8
FB		 1637 if (dwc->revision < DWC3_REVISION_250A)
1638 reg |= DWC3_DEVTEN_ULSTCNGEN;
1639
8698e2ac
FB		 1640 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1641}
1642
1643static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1644{
1645 /* mask all interrupts */
1646 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1647}
1648
1649static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
b15a762f 1650static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
8698e2ac 1651
4e99472b
FB		 1652/**
1653 * dwc3_gadget_setup_nump - Calculate and initialize NUMP field of DCFG
1654 * dwc: pointer to our context structure
1655 *
1656 * The following looks like complex but it's actually very simple. In order to
1657 * calculate the number of packets we can burst at once on OUT transfers, we're
1658 * gonna use RxFIFO size.
1659 *
1660 * To calculate RxFIFO size we need two numbers:
1661 * MDWIDTH = size, in bits, of the internal memory bus
1662 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
1663 *
1664 * Given these two numbers, the formula is simple:
1665 *
1666 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
1667 *
1668 * 24 bytes is for 3x SETUP packets
1669 * 16 bytes is a clock domain crossing tolerance
1670 *
1671 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
1672 */
1673static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
1674{
1675 u32 ram2_depth;
1676 u32 mdwidth;
1677 u32 nump;
1678 u32 reg;
1679
1680 ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
1681 mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
1682
1683 nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
1684 nump = min_t(u32, nump, 16);
1685
1686 /* update NumP */
1687 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1688 reg &= ~DWC3_DCFG_NUMP_MASK;
1689 reg |= nump << DWC3_DCFG_NUMP_SHIFT;
1690 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1691}
1692
d7be2952 1693static int __dwc3_gadget_start(struct dwc3 *dwc)
72246da4 1694{
72246da4 1695 struct dwc3_ep *dep;
72246da4
FB		 1696 int ret = 0;
1697 u32 reg;
1698
72246da4
FB		 1699 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1700 reg &= ~(DWC3_DCFG_SPEED_MASK);
07e7f47b
FB		 1701
1702 /**
1703 * WORKAROUND: DWC3 revision < 2.20a have an issue
1704 * which would cause metastability state on Run/Stop
1705 * bit if we try to force the IP to USB2-only mode.
1706 *
1707 * Because of that, we cannot configure the IP to any
1708 * speed other than the SuperSpeed
1709 *
1710 * Refers to:
1711 *
1712 * STAR#9000525659: Clock Domain Crossing on DCTL in
1713 * USB 2.0 Mode
1714 */
f7e846f0 1715 if (dwc->revision < DWC3_REVISION_220A) {
07e7f47b 1716 reg |= DWC3_DCFG_SUPERSPEED;
f7e846f0
FB		 1717 } else {
1718 switch (dwc->maximum_speed) {
1719 case USB_SPEED_LOW:
2da9ad76 1720 reg |= DWC3_DCFG_LOWSPEED;
f7e846f0
FB		 1721 break;
1722 case USB_SPEED_FULL:
2da9ad76 1723 reg |= DWC3_DCFG_FULLSPEED1;
f7e846f0
FB		 1724 break;
1725 case USB_SPEED_HIGH:
2da9ad76 1726 reg |= DWC3_DCFG_HIGHSPEED;
f7e846f0 1727 break;
7580862b 1728 case USB_SPEED_SUPER_PLUS:
2da9ad76 1729 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
7580862b 1730 break;
f7e846f0 1731 default:
77966eb8
JY		 1732 dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n",
1733 dwc->maximum_speed);
1734 /* fall through */
1735 case USB_SPEED_SUPER:
1736 reg |= DWC3_DCFG_SUPERSPEED;
1737 break;
f7e846f0
FB		 1738 }
1739 }
72246da4
FB		 1740 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1741
2a58f9c1
FB		 1742 /*
1743 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
1744 * field instead of letting dwc3 itself calculate that automatically.
1745 *
1746 * This way, we maximize the chances that we'll be able to get several
1747 * bursts of data without going through any sort of endpoint throttling.
1748 */
1749 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1750 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
1751 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1752
4e99472b
FB		 1753 dwc3_gadget_setup_nump(dwc);
1754
72246da4
FB		 1755 /* Start with SuperSpeed Default */
1756 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1757
1758 dep = dwc->eps[0];
265b70a7
PZ		 1759 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1760 false);
72246da4
FB		 1761 if (ret) {
1762 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
d7be2952 1763 goto err0;
72246da4
FB		 1764 }
1765
1766 dep = dwc->eps[1];
265b70a7
PZ		 1767 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1768 false);
72246da4
FB		 1769 if (ret) {
1770 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
d7be2952 1771 goto err1;
72246da4
FB		 1772 }
1773
1774 /* begin to receive SETUP packets */
c7fcdeb2 1775 dwc->ep0state = EP0_SETUP_PHASE;
72246da4
FB		 1776 dwc3_ep0_out_start(dwc);
1777
8698e2ac
FB		 1778 dwc3_gadget_enable_irq(dwc);
1779
72246da4
FB		 1780 return 0;
1781
b0d7ffd4 1782err1:
d7be2952 1783 __dwc3_gadget_ep_disable(dwc->eps[0]);
b0d7ffd4
FB		 1784
1785err0:
72246da4
FB		 1786 return ret;
1787}
1788
d7be2952
FB		 1789static int dwc3_gadget_start(struct usb_gadget *g,
1790 struct usb_gadget_driver *driver)
72246da4
FB		 1791{
1792 struct dwc3 *dwc = gadget_to_dwc(g);
1793 unsigned long flags;
d7be2952 1794 int ret = 0;
8698e2ac 1795 int irq;
72246da4 1796
9522def4 1797 irq = dwc->irq_gadget;
d7be2952
FB		 1798 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1799 IRQF_SHARED, "dwc3", dwc->ev_buf);
1800 if (ret) {
1801 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1802 irq, ret);
1803 goto err0;
1804 }
1805
72246da4 1806 spin_lock_irqsave(&dwc->lock, flags);
d7be2952
FB		 1807 if (dwc->gadget_driver) {
1808 dev_err(dwc->dev, "%s is already bound to %s\n",
1809 dwc->gadget.name,
1810 dwc->gadget_driver->driver.name);
1811 ret = -EBUSY;
1812 goto err1;
1813 }
1814
1815 dwc->gadget_driver = driver;
1816
fc8bb91b
FB		 1817 if (pm_runtime_active(dwc->dev))
1818 __dwc3_gadget_start(dwc);
1819
d7be2952
FB		 1820 spin_unlock_irqrestore(&dwc->lock, flags);
1821
1822 return 0;
1823
1824err1:
1825 spin_unlock_irqrestore(&dwc->lock, flags);
1826 free_irq(irq, dwc);
1827
1828err0:
1829 return ret;
1830}
72246da4 1831
d7be2952
FB		 1832static void __dwc3_gadget_stop(struct dwc3 *dwc)
1833{
8698e2ac 1834 dwc3_gadget_disable_irq(dwc);
72246da4
FB		 1835 __dwc3_gadget_ep_disable(dwc->eps[0]);
1836 __dwc3_gadget_ep_disable(dwc->eps[1]);
d7be2952 1837}
72246da4 1838
d7be2952
FB		 1839static int dwc3_gadget_stop(struct usb_gadget *g)
1840{
1841 struct dwc3 *dwc = gadget_to_dwc(g);
1842 unsigned long flags;
76a638f8 1843 int epnum;
72246da4 1844
d7be2952 1845 spin_lock_irqsave(&dwc->lock, flags);
76a638f8
BW		 1846
1847 if (pm_runtime_suspended(dwc->dev))
1848 goto out;
1849
d7be2952 1850 __dwc3_gadget_stop(dwc);
76a638f8
BW		 1851
1852 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1853 struct dwc3_ep *dep = dwc->eps[epnum];
1854
1855 if (!dep)
1856 continue;
1857
1858 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
1859 continue;
1860
1861 wait_event_lock_irq(dep->wait_end_transfer,
1862 !(dep->flags & DWC3_EP_END_TRANSFER_PENDING),
1863 dwc->lock);
1864 }
1865
1866out:
d7be2952 1867 dwc->gadget_driver = NULL;
72246da4
FB		 1868 spin_unlock_irqrestore(&dwc->lock, flags);
1869
3f308d17 1870 free_irq(dwc->irq_gadget, dwc->ev_buf);
b0d7ffd4 1871
72246da4
FB		 1872 return 0;
1873}
802fde98 1874
72246da4
FB		 1875static const struct usb_gadget_ops dwc3_gadget_ops = {
1876 .get_frame = dwc3_gadget_get_frame,
1877 .wakeup = dwc3_gadget_wakeup,
1878 .set_selfpowered = dwc3_gadget_set_selfpowered,
1879 .pullup = dwc3_gadget_pullup,
1880 .udc_start = dwc3_gadget_start,
1881 .udc_stop = dwc3_gadget_stop,
1882};
1883
1884/* -------------------------------------------------------------------------- */
1885
6a1e3ef4
FB		 1886static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1887 u8 num, u32 direction)
72246da4
FB		 1888{
1889 struct dwc3_ep *dep;
6a1e3ef4 1890 u8 i;
72246da4 1891
6a1e3ef4 1892 for (i = 0; i < num; i++) {
d07fa665 1893 u8 epnum = (i << 1) | (direction ? 1 : 0);
72246da4 1894
72246da4 1895 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
734d5a53 1896 if (!dep)
72246da4 1897 return -ENOMEM;
72246da4
FB		 1898
1899 dep->dwc = dwc;
1900 dep->number = epnum;
9aa62ae4 1901 dep->direction = !!direction;
2eb88016 1902 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
72246da4
FB		 1903 dwc->eps[epnum] = dep;
1904
1905 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1906 (epnum & 1) ? "in" : "out");
6a1e3ef4 1907
72246da4 1908 dep->endpoint.name = dep->name;
74674cbf 1909 spin_lock_init(&dep->lock);
72246da4 1910
73815280 1911 dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name);
653df35e 1912
72246da4 1913 if (epnum == 0 || epnum == 1) {
e117e742 1914 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
6048e4c6 1915 dep->endpoint.maxburst = 1;
72246da4
FB		 1916 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1917 if (!epnum)
1918 dwc->gadget.ep0 = &dep->endpoint;
1919 } else {
1920 int ret;
1921
e117e742 1922 usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
12d36c16 1923 dep->endpoint.max_streams = 15;
72246da4
FB		 1924 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1925 list_add_tail(&dep->endpoint.ep_list,
1926 &dwc->gadget.ep_list);
1927
1928 ret = dwc3_alloc_trb_pool(dep);
25b8ff68 1929 if (ret)
72246da4 1930 return ret;
72246da4 1931 }
25b8ff68 1932
a474d3b7
RB		 1933 if (epnum == 0 || epnum == 1) {
1934 dep->endpoint.caps.type_control = true;
1935 } else {
1936 dep->endpoint.caps.type_iso = true;
1937 dep->endpoint.caps.type_bulk = true;
1938 dep->endpoint.caps.type_int = true;
1939 }
1940
1941 dep->endpoint.caps.dir_in = !!direction;
1942 dep->endpoint.caps.dir_out = !direction;
1943
aa3342c8
FB		 1944 INIT_LIST_HEAD(&dep->pending_list);
1945 INIT_LIST_HEAD(&dep->started_list);
72246da4
FB		 1946 }
1947
1948 return 0;
1949}
1950
6a1e3ef4
FB		 1951static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1952{
1953 int ret;
1954
1955 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1956
1957 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1958 if (ret < 0) {
73815280
FB		 1959 dwc3_trace(trace_dwc3_gadget,
1960 "failed to allocate OUT endpoints");
6a1e3ef4
FB		 1961 return ret;
1962 }
1963
1964 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1965 if (ret < 0) {
73815280
FB		 1966 dwc3_trace(trace_dwc3_gadget,
1967 "failed to allocate IN endpoints");
6a1e3ef4
FB		 1968 return ret;
1969 }
1970
1971 return 0;
1972}
1973
72246da4
FB		 1974static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1975{
1976 struct dwc3_ep *dep;
1977 u8 epnum;
1978
1979 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1980 dep = dwc->eps[epnum];
6a1e3ef4
FB		 1981 if (!dep)
1982 continue;
5bf8fae3
GC		 1983 /*
1984 * Physical endpoints 0 and 1 are special; they form the
1985 * bi-directional USB endpoint 0.
1986 *
1987 * For those two physical endpoints, we don't allocate a TRB
1988 * pool nor do we add them the endpoints list. Due to that, we
1989 * shouldn't do these two operations otherwise we would end up
1990 * with all sorts of bugs when removing dwc3.ko.
1991 */
1992 if (epnum != 0 && epnum != 1) {
1993 dwc3_free_trb_pool(dep);
72246da4 1994 list_del(&dep->endpoint.ep_list);
5bf8fae3 1995 }
72246da4
FB		 1996
1997 kfree(dep);
1998 }
1999}
2000
72246da4 2001/* -------------------------------------------------------------------------- */
e5caff68 2002
e5ba5ec8
PA		 2003static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
2004 struct dwc3_request *req, struct dwc3_trb *trb,
e5b36ae2
FB		 2005 const struct dwc3_event_depevt *event, int status,
2006 int chain)
72246da4 2007{
72246da4
FB		 2008 unsigned int count;
2009 unsigned int s_pkt = 0;
d6d6ec7b 2010 unsigned int trb_status;
72246da4 2011
dc55c67e 2012 dwc3_ep_inc_deq(dep);
a9c3ca5f
FB		 2013
2014 if (req->trb == trb)
2015 dep->queued_requests--;
2016
2c4cbe6e
FB		 2017 trace_dwc3_complete_trb(dep, trb);
2018
e5b36ae2
FB		 2019 /*
2020 * If we're in the middle of series of chained TRBs and we
2021 * receive a short transfer along the way, DWC3 will skip
2022 * through all TRBs including the last TRB in the chain (the
2023 * where CHN bit is zero. DWC3 will also avoid clearing HWO
2024 * bit and SW has to do it manually.
2025 *
2026 * We're going to do that here to avoid problems of HW trying
2027 * to use bogus TRBs for transfers.
2028 */
2029 if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
2030 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2031
e5ba5ec8 2032 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
a0ad85ae 2033 return 1;
e5b36ae2 2034
e5ba5ec8 2035 count = trb->size & DWC3_TRB_SIZE_MASK;
e62c5bc5 2036 req->remaining += count;
e5ba5ec8
PA		 2037
2038 if (dep->direction) {
2039 if (count) {
2040 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
2041 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
ec5e795c 2042 dwc3_trace(trace_dwc3_gadget,
60cfb37a 2043 "%s: incomplete IN transfer",
e5ba5ec8
PA		 2044 dep->name);
2045 /*
2046 * If missed isoc occurred and there is
2047 * no request queued then issue END
2048 * TRANSFER, so that core generates
2049 * next xfernotready and we will issue
2050 * a fresh START TRANSFER.
2051 * If there are still queued request
2052 * then wait, do not issue either END
2053 * or UPDATE TRANSFER, just attach next
aa3342c8 2054 * request in pending_list during
e5ba5ec8
PA		 2055 * giveback.If any future queued request
2056 * is successfully transferred then we
2057 * will issue UPDATE TRANSFER for all
aa3342c8 2058 * request in the pending_list.
e5ba5ec8
PA		 2059 */
2060 dep->flags |= DWC3_EP_MISSED_ISOC;
2061 } else {
2062 dev_err(dwc->dev, "incomplete IN transfer %s\n",
2063 dep->name);
2064 status = -ECONNRESET;
2065 }
2066 } else {
2067 dep->flags &= ~DWC3_EP_MISSED_ISOC;
2068 }
2069 } else {
2070 if (count && (event->status & DEPEVT_STATUS_SHORT))
2071 s_pkt = 1;
2072 }
2073
7c705dfe 2074 if (s_pkt && !chain)
e5ba5ec8 2075 return 1;
f99f53f2 2076
e5ba5ec8
PA		 2077 if ((event->status & DEPEVT_STATUS_IOC) &&
2078 (trb->ctrl & DWC3_TRB_CTRL_IOC))
2079 return 1;
f99f53f2 2080
e5ba5ec8
PA		 2081 return 0;
2082}
2083
2084static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
2085 const struct dwc3_event_depevt *event, int status)
2086{
31162af4 2087 struct dwc3_request *req, *n;
e5ba5ec8 2088 struct dwc3_trb *trb;
d6e10bf2 2089 bool ioc = false;
e62c5bc5 2090 int ret = 0;
e5ba5ec8 2091
31162af4 2092 list_for_each_entry_safe(req, n, &dep->started_list, list) {
1f512119 2093 unsigned length;
e5b36ae2
FB		 2094 int chain;
2095
1f512119
FB		 2096 length = req->request.length;
2097 chain = req->num_pending_sgs > 0;
31162af4 2098 if (chain) {
1f512119 2099 struct scatterlist *sg = req->sg;
31162af4 2100 struct scatterlist *s;
1f512119 2101 unsigned int pending = req->num_pending_sgs;
31162af4 2102 unsigned int i;
c7de5734 2103
1f512119 2104 for_each_sg(sg, s, pending, i) {
31162af4 2105 trb = &dep->trb_pool[dep->trb_dequeue];
31162af4 2106
1f512119
FB		 2107 req->sg = sg_next(s);
2108 req->num_pending_sgs--;
2109
31162af4
FB		 2110 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
2111 event, status, chain);
1f512119
FB		 2112 if (ret)
2113 break;
31162af4
FB		 2114 }
2115 } else {
737f1ae2 2116 trb = &dep->trb_pool[dep->trb_dequeue];
d115d705 2117 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
e5b36ae2 2118 event, status, chain);
31162af4 2119 }
d115d705 2120
e62c5bc5 2121 req->request.actual = length - req->remaining;
1f512119 2122
e62c5bc5
FB		 2123 if (ret && chain && (req->request.actual < length)
2124 && req->num_pending_sgs)
1f512119
FB		 2125 return __dwc3_gadget_kick_transfer(dep, 0);
2126
d115d705 2127 dwc3_gadget_giveback(dep, req, status);
e5ba5ec8 2128
d6e10bf2
AB		 2129 if (ret) {
2130 if ((event->status & DEPEVT_STATUS_IOC) &&
2131 (trb->ctrl & DWC3_TRB_CTRL_IOC))
2132 ioc = true;
72246da4 2133 break;
d6e10bf2 2134 }
31162af4 2135 }
72246da4 2136
4cb42217
FB		 2137 /*
2138 * Our endpoint might get disabled by another thread during
2139 * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2140 * early on so DWC3_EP_BUSY flag gets cleared
2141 */
2142 if (!dep->endpoint.desc)
2143 return 1;
2144
cdc359dd 2145 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
aa3342c8
FB		 2146 list_empty(&dep->started_list)) {
2147 if (list_empty(&dep->pending_list)) {
cdc359dd
PA		 2148 /*
2149 * If there is no entry in request list then do
2150 * not issue END TRANSFER now. Just set PENDING
2151 * flag, so that END TRANSFER is issued when an
2152 * entry is added into request list.
2153 */
2154 dep->flags = DWC3_EP_PENDING_REQUEST;
2155 } else {
b992e681 2156 dwc3_stop_active_transfer(dwc, dep->number, true);
cdc359dd
PA		 2157 dep->flags = DWC3_EP_ENABLED;
2158 }
7efea86c
PA		 2159 return 1;
2160 }
2161
d6e10bf2
AB		 2162 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && ioc)
2163 return 0;
2164
72246da4
FB		 2165 return 1;
2166}
2167
2168static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
029d97ff 2169 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
72246da4
FB		 2170{
2171 unsigned status = 0;
2172 int clean_busy;
e18b7975
FB		 2173 u32 is_xfer_complete;
2174
2175 is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
72246da4
FB		 2176
2177 if (event->status & DEPEVT_STATUS_BUSERR)
2178 status = -ECONNRESET;
2179
1d046793 2180 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
4cb42217 2181 if (clean_busy && (!dep->endpoint.desc || is_xfer_complete ||
e18b7975 2182 usb_endpoint_xfer_isoc(dep->endpoint.desc)))
72246da4 2183 dep->flags &= ~DWC3_EP_BUSY;
fae2b904
FB		 2184
2185 /*
2186 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2187 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2188 */
2189 if (dwc->revision < DWC3_REVISION_183A) {
2190 u32 reg;
2191 int i;
2192
2193 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
348e026f 2194 dep = dwc->eps[i];
fae2b904
FB		 2195
2196 if (!(dep->flags & DWC3_EP_ENABLED))
2197 continue;
2198
aa3342c8 2199 if (!list_empty(&dep->started_list))
fae2b904
FB		 2200 return;
2201 }
2202
2203 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2204 reg |= dwc->u1u2;
2205 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2206
2207 dwc->u1u2 = 0;
2208 }
8a1a9c9e 2209
4cb42217
FB		 2210 /*
2211 * Our endpoint might get disabled by another thread during
2212 * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2213 * early on so DWC3_EP_BUSY flag gets cleared
2214 */
2215 if (!dep->endpoint.desc)
2216 return;
2217
e6e709b7 2218 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
8a1a9c9e
FB		 2219 int ret;
2220
4fae2e3e 2221 ret = __dwc3_gadget_kick_transfer(dep, 0);
8a1a9c9e
FB		 2222 if (!ret || ret == -EBUSY)
2223 return;
2224 }
72246da4
FB		 2225}
2226
72246da4
FB		 2227static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2228 const struct dwc3_event_depevt *event)
2229{
2230 struct dwc3_ep *dep;
2231 u8 epnum = event->endpoint_number;
76a638f8 2232 u8 cmd;
72246da4
FB		 2233
2234 dep = dwc->eps[epnum];
2235
76a638f8
BW		 2236 if (!(dep->flags & DWC3_EP_ENABLED) &&
2237 !(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
3336abb5
FB		 2238 return;
2239
72246da4
FB		 2240 if (epnum == 0 || epnum == 1) {
2241 dwc3_ep0_interrupt(dwc, event);
2242 return;
2243 }
2244
2245 switch (event->endpoint_event) {
2246 case DWC3_DEPEVT_XFERCOMPLETE:
b4996a86 2247 dep->resource_index = 0;
c2df85ca 2248
16e78db7 2249 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
8566cd1a 2250 dev_err(dwc->dev, "XferComplete for Isochronous endpoint\n");
72246da4
FB		 2251 return;
2252 }
2253
029d97ff 2254 dwc3_endpoint_transfer_complete(dwc, dep, event);
72246da4
FB		 2255 break;
2256 case DWC3_DEPEVT_XFERINPROGRESS:
029d97ff 2257 dwc3_endpoint_transfer_complete(dwc, dep, event);
72246da4
FB		 2258 break;
2259 case DWC3_DEPEVT_XFERNOTREADY:
16e78db7 2260 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
72246da4
FB		 2261 dwc3_gadget_start_isoc(dwc, dep, event);
2262 } else {
2263 int ret;
2264
4fae2e3e 2265 ret = __dwc3_gadget_kick_transfer(dep, 0);
72246da4
FB		 2266 if (!ret || ret == -EBUSY)
2267 return;
72246da4
FB		 2268 }
2269
879631aa
FB		 2270 break;
2271 case DWC3_DEPEVT_STREAMEVT:
16e78db7 2272 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
879631aa
FB		 2273 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2274 dep->name);
2275 return;
2276 }
72246da4 2277 break;
72246da4 2278 case DWC3_DEPEVT_EPCMDCMPLT:
76a638f8
BW		 2279 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
2280
2281 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
2282 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
2283 wake_up(&dep->wait_end_transfer);
2284 }
2285 break;
2286 case DWC3_DEPEVT_RXTXFIFOEVT:
72246da4
FB		 2287 break;
2288 }
2289}
2290
2291static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2292{
2293 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2294 spin_unlock(&dwc->lock);
2295 dwc->gadget_driver->disconnect(&dwc->gadget);
2296 spin_lock(&dwc->lock);
2297 }
2298}
2299
bc5ba2e0
FB		 2300static void dwc3_suspend_gadget(struct dwc3 *dwc)
2301{
73a30bfc 2302 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
bc5ba2e0
FB		 2303 spin_unlock(&dwc->lock);
2304 dwc->gadget_driver->suspend(&dwc->gadget);
2305 spin_lock(&dwc->lock);
2306 }
2307}
2308
2309static void dwc3_resume_gadget(struct dwc3 *dwc)
2310{
73a30bfc 2311 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
bc5ba2e0
FB		 2312 spin_unlock(&dwc->lock);
2313 dwc->gadget_driver->resume(&dwc->gadget);
5c7b3b02 2314 spin_lock(&dwc->lock);
8e74475b
FB		 2315 }
2316}
2317
2318static void dwc3_reset_gadget(struct dwc3 *dwc)
2319{
2320 if (!dwc->gadget_driver)
2321 return;
2322
2323 if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2324 spin_unlock(&dwc->lock);
2325 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
bc5ba2e0
FB		 2326 spin_lock(&dwc->lock);
2327 }
2328}
2329
b992e681 2330static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
72246da4
FB		 2331{
2332 struct dwc3_ep *dep;
2333 struct dwc3_gadget_ep_cmd_params params;
2334 u32 cmd;
2335 int ret;
2336
2337 dep = dwc->eps[epnum];
2338
76a638f8
BW		 2339 if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
2340 !dep->resource_index)
3daf74d7
PA		 2341 return;
2342
57911504
PA		 2343 /*
2344 * NOTICE: We are violating what the Databook says about the
2345 * EndTransfer command. Ideally we would _always_ wait for the
2346 * EndTransfer Command Completion IRQ, but that's causing too
2347 * much trouble synchronizing between us and gadget driver.
2348 *
2349 * We have discussed this with the IP Provider and it was
2350 * suggested to giveback all requests here, but give HW some
2351 * extra time to synchronize with the interconnect. We're using
dc93b41a 2352 * an arbitrary 100us delay for that.
57911504
PA		 2353 *
2354 * Note also that a similar handling was tested by Synopsys
2355 * (thanks a lot Paul) and nothing bad has come out of it.
2356 * In short, what we're doing is:
2357 *
2358 * - Issue EndTransfer WITH CMDIOC bit set
2359 * - Wait 100us
06281d46
JY		 2360 *
2361 * As of IP version 3.10a of the DWC_usb3 IP, the controller
2362 * supports a mode to work around the above limitation. The
2363 * software can poll the CMDACT bit in the DEPCMD register
2364 * after issuing a EndTransfer command. This mode is enabled
2365 * by writing GUCTL2[14]. This polling is already done in the
2366 * dwc3_send_gadget_ep_cmd() function so if the mode is
2367 * enabled, the EndTransfer command will have completed upon
2368 * returning from this function and we don't need to delay for
2369 * 100us.
2370 *
2371 * This mode is NOT available on the DWC_usb31 IP.
57911504
PA		 2372 */
2373
3daf74d7 2374 cmd = DWC3_DEPCMD_ENDTRANSFER;
b992e681
PZ		 2375 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2376 cmd |= DWC3_DEPCMD_CMDIOC;
b4996a86 2377 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
3daf74d7 2378 memset(&params, 0, sizeof(params));
2cd4718d 2379 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
3daf74d7 2380 WARN_ON_ONCE(ret);
b4996a86 2381 dep->resource_index = 0;
041d81f4 2382 dep->flags &= ~DWC3_EP_BUSY;
06281d46 2383
76a638f8
BW		 2384 if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) {
2385 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
06281d46 2386 udelay(100);
76a638f8 2387 }
72246da4
FB		 2388}
2389
72246da4
FB		 2390static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2391{
2392 u32 epnum;
2393
2394 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2395 struct dwc3_ep *dep;
72246da4
FB		 2396 int ret;
2397
2398 dep = dwc->eps[epnum];
6a1e3ef4
FB		 2399 if (!dep)
2400 continue;
72246da4
FB		 2401
2402 if (!(dep->flags & DWC3_EP_STALL))
2403 continue;
2404
2405 dep->flags &= ~DWC3_EP_STALL;
2406
50c763f8 2407 ret = dwc3_send_clear_stall_ep_cmd(dep);
72246da4
FB		 2408 WARN_ON_ONCE(ret);
2409 }
2410}
2411
2412static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2413{
c4430a26
FB		 2414 int reg;
2415
72246da4
FB		 2416 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2417 reg &= ~DWC3_DCTL_INITU1ENA;
2418 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2419
2420 reg &= ~DWC3_DCTL_INITU2ENA;
2421 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
72246da4 2422
72246da4
FB		 2423 dwc3_disconnect_gadget(dwc);
2424
2425 dwc->gadget.speed = USB_SPEED_UNKNOWN;
df62df56 2426 dwc->setup_packet_pending = false;
06a374ed 2427 usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
fc8bb91b
FB		 2428
2429 dwc->connected = false;
72246da4
FB		 2430}
2431
72246da4
FB		 2432static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2433{
2434 u32 reg;
2435
fc8bb91b
FB		 2436 dwc->connected = true;
2437
df62df56
FB		 2438 /*
2439 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2440 * would cause a missing Disconnect Event if there's a
2441 * pending Setup Packet in the FIFO.
2442 *
2443 * There's no suggested workaround on the official Bug
2444 * report, which states that "unless the driver/application
2445 * is doing any special handling of a disconnect event,
2446 * there is no functional issue".
2447 *
2448 * Unfortunately, it turns out that we _do_ some special
2449 * handling of a disconnect event, namely complete all
2450 * pending transfers, notify gadget driver of the
2451 * disconnection, and so on.
2452 *
2453 * Our suggested workaround is to follow the Disconnect
2454 * Event steps here, instead, based on a setup_packet_pending
b5d335e5
FB		 2455 * flag. Such flag gets set whenever we have a SETUP_PENDING
2456 * status for EP0 TRBs and gets cleared on XferComplete for the
df62df56
FB		 2457 * same endpoint.
2458 *
2459 * Refers to:
2460 *
2461 * STAR#9000466709: RTL: Device : Disconnect event not
2462 * generated if setup packet pending in FIFO
2463 */
2464 if (dwc->revision < DWC3_REVISION_188A) {
2465 if (dwc->setup_packet_pending)
2466 dwc3_gadget_disconnect_interrupt(dwc);
2467 }
2468
8e74475b 2469 dwc3_reset_gadget(dwc);
72246da4
FB		 2470
2471 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2472 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2473 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
3b637367 2474 dwc->test_mode = false;
72246da4
FB		 2475 dwc3_clear_stall_all_ep(dwc);
2476
2477 /* Reset device address to zero */
2478 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2479 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2480 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
72246da4
FB		 2481}
2482
2483static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2484{
2485 u32 reg;
2486 u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2487
2488 /*
2489 * We change the clock only at SS but I dunno why I would want to do
2490 * this. Maybe it becomes part of the power saving plan.
2491 */
2492
ee5cd41c
JY		 2493 if ((speed != DWC3_DSTS_SUPERSPEED) &&
2494 (speed != DWC3_DSTS_SUPERSPEED_PLUS))
72246da4
FB		 2495 return;
2496
2497 /*
2498 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2499 * each time on Connect Done.
2500 */
2501 if (!usb30_clock)
2502 return;
2503
2504 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2505 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2506 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2507}
2508
72246da4
FB		 2509static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2510{
72246da4
FB		 2511 struct dwc3_ep *dep;
2512 int ret;
2513 u32 reg;
2514 u8 speed;
2515
72246da4
FB		 2516 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2517 speed = reg & DWC3_DSTS_CONNECTSPD;
2518 dwc->speed = speed;
2519
2520 dwc3_update_ram_clk_sel(dwc, speed);
2521
2522 switch (speed) {
2da9ad76 2523 case DWC3_DSTS_SUPERSPEED_PLUS:
7580862b
JY		 2524 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2525 dwc->gadget.ep0->maxpacket = 512;
2526 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2527 break;
2da9ad76 2528 case DWC3_DSTS_SUPERSPEED:
05870c5b
FB		 2529 /*
2530 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2531 * would cause a missing USB3 Reset event.
2532 *
2533 * In such situations, we should force a USB3 Reset
2534 * event by calling our dwc3_gadget_reset_interrupt()
2535 * routine.
2536 *
2537 * Refers to:
2538 *
2539 * STAR#9000483510: RTL: SS : USB3 reset event may
2540 * not be generated always when the link enters poll
2541 */
2542 if (dwc->revision < DWC3_REVISION_190A)
2543 dwc3_gadget_reset_interrupt(dwc);
2544
72246da4
FB		 2545 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2546 dwc->gadget.ep0->maxpacket = 512;
2547 dwc->gadget.speed = USB_SPEED_SUPER;
2548 break;
2da9ad76 2549 case DWC3_DSTS_HIGHSPEED:
72246da4
FB		 2550 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2551 dwc->gadget.ep0->maxpacket = 64;
2552 dwc->gadget.speed = USB_SPEED_HIGH;
2553 break;
2da9ad76
JY		 2554 case DWC3_DSTS_FULLSPEED2:
2555 case DWC3_DSTS_FULLSPEED1:
72246da4
FB		 2556 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2557 dwc->gadget.ep0->maxpacket = 64;
2558 dwc->gadget.speed = USB_SPEED_FULL;
2559 break;
2da9ad76 2560 case DWC3_DSTS_LOWSPEED:
72246da4
FB		 2561 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2562 dwc->gadget.ep0->maxpacket = 8;
2563 dwc->gadget.speed = USB_SPEED_LOW;
2564 break;
2565 }
2566
2b758350
PA		 2567 /* Enable USB2 LPM Capability */
2568
ee5cd41c 2569 if ((dwc->revision > DWC3_REVISION_194A) &&
2da9ad76
JY		 2570 (speed != DWC3_DSTS_SUPERSPEED) &&
2571 (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
2b758350
PA		 2572 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2573 reg |= DWC3_DCFG_LPM_CAP;
2574 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2575
2576 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2577 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2578
460d098c 2579 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2b758350 2580
80caf7d2
HR		 2581 /*
2582 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2583 * DCFG.LPMCap is set, core responses with an ACK and the
2584 * BESL value in the LPM token is less than or equal to LPM
2585 * NYET threshold.
2586 */
2587 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2588 && dwc->has_lpm_erratum,
2589 "LPM Erratum not available on dwc3 revisisions < 2.40a\n");
2590
2591 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2592 reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2593
356363bf
FB		 2594 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2595 } else {
2596 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2597 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2b758350
PA		 2598 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2599 }
2600
72246da4 2601 dep = dwc->eps[0];
265b70a7
PZ		 2602 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2603 false);
72246da4
FB		 2604 if (ret) {
2605 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2606 return;
2607 }
2608
2609 dep = dwc->eps[1];
265b70a7
PZ		 2610 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2611 false);
72246da4
FB		 2612 if (ret) {
2613 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2614 return;
2615 }
2616
2617 /*
2618 * Configure PHY via GUSB3PIPECTLn if required.
2619 *
2620 * Update GTXFIFOSIZn
2621 *
2622 * In both cases reset values should be sufficient.
2623 */
2624}
2625
2626static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2627{
72246da4
FB		 2628 /*
2629 * TODO take core out of low power mode when that's
2630 * implemented.
2631 */
2632
ad14d4e0
JL		 2633 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2634 spin_unlock(&dwc->lock);
2635 dwc->gadget_driver->resume(&dwc->gadget);
2636 spin_lock(&dwc->lock);
2637 }
72246da4
FB		 2638}
2639
2640static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2641 unsigned int evtinfo)
2642{
fae2b904 2643 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
0b0cc1cd
FB		 2644 unsigned int pwropt;
2645
2646 /*
2647 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2648 * Hibernation mode enabled which would show up when device detects
2649 * host-initiated U3 exit.
2650 *
2651 * In that case, device will generate a Link State Change Interrupt
2652 * from U3 to RESUME which is only necessary if Hibernation is
2653 * configured in.
2654 *
2655 * There are no functional changes due to such spurious event and we
2656 * just need to ignore it.
2657 *
2658 * Refers to:
2659 *
2660 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2661 * operational mode
2662 */
2663 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2664 if ((dwc->revision < DWC3_REVISION_250A) &&
2665 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2666 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2667 (next == DWC3_LINK_STATE_RESUME)) {
73815280
FB		 2668 dwc3_trace(trace_dwc3_gadget,
2669 "ignoring transition U3 -> Resume");
0b0cc1cd
FB		 2670 return;
2671 }
2672 }
fae2b904
FB		 2673
2674 /*
2675 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2676 * on the link partner, the USB session might do multiple entry/exit
2677 * of low power states before a transfer takes place.
2678 *
2679 * Due to this problem, we might experience lower throughput. The
2680 * suggested workaround is to disable DCTL[12:9] bits if we're
2681 * transitioning from U1/U2 to U0 and enable those bits again
2682 * after a transfer completes and there are no pending transfers
2683 * on any of the enabled endpoints.
2684 *
2685 * This is the first half of that workaround.
2686 *
2687 * Refers to:
2688 *
2689 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2690 * core send LGO_Ux entering U0
2691 */
2692 if (dwc->revision < DWC3_REVISION_183A) {
2693 if (next == DWC3_LINK_STATE_U0) {
2694 u32 u1u2;
2695 u32 reg;
2696
2697 switch (dwc->link_state) {
2698 case DWC3_LINK_STATE_U1:
2699 case DWC3_LINK_STATE_U2:
2700 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2701 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2702 | DWC3_DCTL_ACCEPTU2ENA
2703 | DWC3_DCTL_INITU1ENA
2704 | DWC3_DCTL_ACCEPTU1ENA);
2705
2706 if (!dwc->u1u2)
2707 dwc->u1u2 = reg & u1u2;
2708
2709 reg &= ~u1u2;
2710
2711 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2712 break;
2713 default:
2714 /* do nothing */
2715 break;
2716 }
2717 }
2718 }
2719
bc5ba2e0
FB		 2720 switch (next) {
2721 case DWC3_LINK_STATE_U1:
2722 if (dwc->speed == USB_SPEED_SUPER)
2723 dwc3_suspend_gadget(dwc);
2724 break;
2725 case DWC3_LINK_STATE_U2:
2726 case DWC3_LINK_STATE_U3:
2727 dwc3_suspend_gadget(dwc);
2728 break;
2729 case DWC3_LINK_STATE_RESUME:
2730 dwc3_resume_gadget(dwc);
2731 break;
2732 default:
2733 /* do nothing */
2734 break;
2735 }
2736
e57ebc1d 2737 dwc->link_state = next;
72246da4
FB		 2738}
2739
72704f87
BW		 2740static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
2741 unsigned int evtinfo)
2742{
2743 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2744
2745 if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
2746 dwc3_suspend_gadget(dwc);
2747
2748 dwc->link_state = next;
2749}
2750
e1dadd3b
FB		 2751static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2752 unsigned int evtinfo)
2753{
2754 unsigned int is_ss = evtinfo & BIT(4);
2755
2756 /**
2757 * WORKAROUND: DWC3 revison 2.20a with hibernation support
2758 * have a known issue which can cause USB CV TD.9.23 to fail
2759 * randomly.
2760 *
2761 * Because of this issue, core could generate bogus hibernation
2762 * events which SW needs to ignore.
2763 *
2764 * Refers to:
2765 *
2766 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2767 * Device Fallback from SuperSpeed
2768 */
2769 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2770 return;
2771
2772 /* enter hibernation here */
2773}
2774
72246da4
FB		 2775static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2776 const struct dwc3_event_devt *event)
2777{
2778 switch (event->type) {
2779 case DWC3_DEVICE_EVENT_DISCONNECT:
2780 dwc3_gadget_disconnect_interrupt(dwc);
2781 break;
2782 case DWC3_DEVICE_EVENT_RESET:
2783 dwc3_gadget_reset_interrupt(dwc);
2784 break;
2785 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2786 dwc3_gadget_conndone_interrupt(dwc);
2787 break;
2788 case DWC3_DEVICE_EVENT_WAKEUP:
2789 dwc3_gadget_wakeup_interrupt(dwc);
2790 break;
e1dadd3b
FB		 2791 case DWC3_DEVICE_EVENT_HIBER_REQ:
2792 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2793 "unexpected hibernation event\n"))
2794 break;
2795
2796 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2797 break;
72246da4
FB		 2798 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2799 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2800 break;
2801 case DWC3_DEVICE_EVENT_EOPF:
72704f87
BW		 2802 /* It changed to be suspend event for version 2.30a and above */
2803 if (dwc->revision < DWC3_REVISION_230A) {
2804 dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
2805 } else {
2806 dwc3_trace(trace_dwc3_gadget, "U3/L1-L2 Suspend Event");
2807
2808 /*
2809 * Ignore suspend event until the gadget enters into
2810 * USB_STATE_CONFIGURED state.
2811 */
2812 if (dwc->gadget.state >= USB_STATE_CONFIGURED)
2813 dwc3_gadget_suspend_interrupt(dwc,
2814 event->event_info);
2815 }
72246da4
FB		 2816 break;
2817 case DWC3_DEVICE_EVENT_SOF:
72246da4 2818 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
72246da4 2819 case DWC3_DEVICE_EVENT_CMD_CMPL:
72246da4 2820 case DWC3_DEVICE_EVENT_OVERFLOW:
72246da4
FB		 2821 break;
2822 default:
e9f2aa87 2823 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
72246da4
FB		 2824 }
2825}
2826
2827static void dwc3_process_event_entry(struct dwc3 *dwc,
2828 const union dwc3_event *event)
2829{
43c96be1 2830 trace_dwc3_event(event->raw, dwc);
2c4cbe6e 2831
72246da4
FB		 2832 /* Endpoint IRQ, handle it and return early */
2833 if (event->type.is_devspec == 0) {
2834 /* depevt */
2835 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2836 }
2837
2838 switch (event->type.type) {
2839 case DWC3_EVENT_TYPE_DEV:
2840 dwc3_gadget_interrupt(dwc, &event->devt);
2841 break;
2842 /* REVISIT what to do with Carkit and I2C events ? */
2843 default:
2844 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2845 }
2846}
2847
dea520a4 2848static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
b15a762f 2849{
dea520a4 2850 struct dwc3 *dwc = evt->dwc;
b15a762f 2851 irqreturn_t ret = IRQ_NONE;
f42f2447 2852 int left;
e8adfc30 2853 u32 reg;
b15a762f 2854
f42f2447 2855 left = evt->count;
b15a762f 2856
f42f2447
FB		 2857 if (!(evt->flags & DWC3_EVENT_PENDING))
2858 return IRQ_NONE;
b15a762f 2859
f42f2447
FB		 2860 while (left > 0) {
2861 union dwc3_event event;
b15a762f 2862
f42f2447 2863 event.raw = *(u32 *) (evt->buf + evt->lpos);
b15a762f 2864
f42f2447 2865 dwc3_process_event_entry(dwc, &event);
b15a762f 2866
f42f2447
FB		 2867 /*
2868 * FIXME we wrap around correctly to the next entry as
2869 * almost all entries are 4 bytes in size. There is one
2870 * entry which has 12 bytes which is a regular entry
2871 * followed by 8 bytes data. ATM I don't know how
2872 * things are organized if we get next to the a
2873 * boundary so I worry about that once we try to handle
2874 * that.
2875 */
2876 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2877 left -= 4;
b15a762f 2878
660e9bde 2879 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 4);
f42f2447 2880 }
b15a762f 2881
f42f2447
FB		 2882 evt->count = 0;
2883 evt->flags &= ~DWC3_EVENT_PENDING;
2884 ret = IRQ_HANDLED;
b15a762f 2885
f42f2447 2886 /* Unmask interrupt */
660e9bde 2887 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
f42f2447 2888 reg &= ~DWC3_GEVNTSIZ_INTMASK;
660e9bde 2889 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
b15a762f 2890
f42f2447
FB		 2891 return ret;
2892}
e8adfc30 2893
dea520a4 2894static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
f42f2447 2895{
dea520a4
FB		 2896 struct dwc3_event_buffer *evt = _evt;
2897 struct dwc3 *dwc = evt->dwc;
e5f68b4a 2898 unsigned long flags;
f42f2447 2899 irqreturn_t ret = IRQ_NONE;
f42f2447 2900
e5f68b4a 2901 spin_lock_irqsave(&dwc->lock, flags);
dea520a4 2902 ret = dwc3_process_event_buf(evt);
e5f68b4a 2903 spin_unlock_irqrestore(&dwc->lock, flags);
b15a762f
FB		 2904
2905 return ret;
2906}
2907
dea520a4 2908static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
72246da4 2909{
dea520a4 2910 struct dwc3 *dwc = evt->dwc;
72246da4 2911 u32 count;
e8adfc30 2912 u32 reg;
72246da4 2913
fc8bb91b
FB		 2914 if (pm_runtime_suspended(dwc->dev)) {
2915 pm_runtime_get(dwc->dev);
2916 disable_irq_nosync(dwc->irq_gadget);
2917 dwc->pending_events = true;
2918 return IRQ_HANDLED;
2919 }
2920
660e9bde 2921 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
72246da4
FB		 2922 count &= DWC3_GEVNTCOUNT_MASK;
2923 if (!count)
2924 return IRQ_NONE;
2925
b15a762f
FB		 2926 evt->count = count;
2927 evt->flags |= DWC3_EVENT_PENDING;
72246da4 2928
e8adfc30 2929 /* Mask interrupt */
660e9bde 2930 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
e8adfc30 2931 reg |= DWC3_GEVNTSIZ_INTMASK;
660e9bde 2932 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
e8adfc30 2933
b15a762f 2934 return IRQ_WAKE_THREAD;
72246da4
FB		 2935}
2936
dea520a4 2937static irqreturn_t dwc3_interrupt(int irq, void *_evt)
72246da4 2938{
dea520a4 2939 struct dwc3_event_buffer *evt = _evt;
72246da4 2940
dea520a4 2941 return dwc3_check_event_buf(evt);
72246da4
FB		 2942}
2943
6db3812e
FB		 2944static int dwc3_gadget_get_irq(struct dwc3 *dwc)
2945{
2946 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
2947 int irq;
2948
2949 irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
2950 if (irq > 0)
2951 goto out;
2952
2953 if (irq == -EPROBE_DEFER)
2954 goto out;
2955
2956 irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
2957 if (irq > 0)
2958 goto out;
2959
2960 if (irq == -EPROBE_DEFER)
2961 goto out;
2962
2963 irq = platform_get_irq(dwc3_pdev, 0);
2964 if (irq > 0)
2965 goto out;
2966
2967 if (irq != -EPROBE_DEFER)
2968 dev_err(dwc->dev, "missing peripheral IRQ\n");
2969
2970 if (!irq)
2971 irq = -EINVAL;
2972
2973out:
2974 return irq;
2975}
2976
72246da4
FB		 2977/**
2978 * dwc3_gadget_init - Initializes gadget related registers
1d046793 2979 * @dwc: pointer to our controller context structure
72246da4
FB		 2980 *
2981 * Returns 0 on success otherwise negative errno.
2982 */
41ac7b3a 2983int dwc3_gadget_init(struct dwc3 *dwc)
72246da4 2984{
6db3812e
FB		 2985 int ret;
2986 int irq;
9522def4 2987
6db3812e
FB		 2988 irq = dwc3_gadget_get_irq(dwc);
2989 if (irq < 0) {
2990 ret = irq;
2991 goto err0;
9522def4
RQ		 2992 }
2993
2994 dwc->irq_gadget = irq;
72246da4
FB		 2995
2996 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2997 &dwc->ctrl_req_addr, GFP_KERNEL);
2998 if (!dwc->ctrl_req) {
2999 dev_err(dwc->dev, "failed to allocate ctrl request\n");
3000 ret = -ENOMEM;
3001 goto err0;
3002 }
3003
2abd9d5f 3004 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
72246da4
FB		 3005 &dwc->ep0_trb_addr, GFP_KERNEL);
3006 if (!dwc->ep0_trb) {
3007 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
3008 ret = -ENOMEM;
3009 goto err1;
3010 }
3011
3ef35faf 3012 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
72246da4 3013 if (!dwc->setup_buf) {
72246da4
FB		 3014 ret = -ENOMEM;
3015 goto err2;
3016 }
3017
5812b1c2 3018 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
3ef35faf
FB		 3019 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
3020 GFP_KERNEL);
5812b1c2
FB		 3021 if (!dwc->ep0_bounce) {
3022 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
3023 ret = -ENOMEM;
3024 goto err3;
3025 }
3026
04c03d10
FB		 3027 dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);
3028 if (!dwc->zlp_buf) {
3029 ret = -ENOMEM;
3030 goto err4;
3031 }
3032
bb014736
BW		 3033 init_completion(&dwc->ep0_in_setup);
3034
72246da4 3035 dwc->gadget.ops = &dwc3_gadget_ops;
72246da4 3036 dwc->gadget.speed = USB_SPEED_UNKNOWN;
eeb720fb 3037 dwc->gadget.sg_supported = true;
72246da4 3038 dwc->gadget.name = "dwc3-gadget";
6a4290cc 3039 dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG;
72246da4 3040
b9e51b2b
BM		 3041 /*
3042 * FIXME We might be setting max_speed to <SUPER, however versions
3043 * <2.20a of dwc3 have an issue with metastability (documented
3044 * elsewhere in this driver) which tells us we can't set max speed to
3045 * anything lower than SUPER.
3046 *
3047 * Because gadget.max_speed is only used by composite.c and function
3048 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
3049 * to happen so we avoid sending SuperSpeed Capability descriptor
3050 * together with our BOS descriptor as that could confuse host into
3051 * thinking we can handle super speed.
3052 *
3053 * Note that, in fact, we won't even support GetBOS requests when speed
3054 * is less than super speed because we don't have means, yet, to tell
3055 * composite.c that we are USB 2.0 + LPM ECN.
3056 */
3057 if (dwc->revision < DWC3_REVISION_220A)
3058 dwc3_trace(trace_dwc3_gadget,
60cfb37a 3059 "Changing max_speed on rev %08x",
b9e51b2b
BM		 3060 dwc->revision);
3061
3062 dwc->gadget.max_speed = dwc->maximum_speed;
3063
a4b9d94b
DC		 3064 /*
3065 * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
3066 * on ep out.
3067 */
3068 dwc->gadget.quirk_ep_out_aligned_size = true;
3069
72246da4
FB		 3070 /*
3071 * REVISIT: Here we should clear all pending IRQs to be
3072 * sure we're starting from a well known location.
3073 */
3074
3075 ret = dwc3_gadget_init_endpoints(dwc);
3076 if (ret)
04c03d10 3077 goto err5;
72246da4 3078
72246da4
FB		 3079 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
3080 if (ret) {
3081 dev_err(dwc->dev, "failed to register udc\n");
04c03d10 3082 goto err5;
72246da4
FB		 3083 }
3084
3085 return 0;
3086
04c03d10
FB		 3087err5:
3088 kfree(dwc->zlp_buf);
3089
5812b1c2 3090err4:
e1f80467 3091 dwc3_gadget_free_endpoints(dwc);
3ef35faf
FB		 3092 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
3093 dwc->ep0_bounce, dwc->ep0_bounce_addr);
5812b1c2 3094
72246da4 3095err3:
0fc9a1be 3096 kfree(dwc->setup_buf);
72246da4
FB		 3097
3098err2:
51fbc7c0 3099 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
72246da4
FB		 3100 dwc->ep0_trb, dwc->ep0_trb_addr);
3101
3102err1:
3103 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
3104 dwc->ctrl_req, dwc->ctrl_req_addr);
3105
3106err0:
3107 return ret;
3108}
3109
7415f17c
FB		 3110/* -------------------------------------------------------------------------- */
3111
72246da4
FB		 3112void dwc3_gadget_exit(struct dwc3 *dwc)
3113{
72246da4 3114 usb_del_gadget_udc(&dwc->gadget);
72246da4 3115
72246da4
FB		 3116 dwc3_gadget_free_endpoints(dwc);
3117
3ef35faf
FB		 3118 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
3119 dwc->ep0_bounce, dwc->ep0_bounce_addr);
5812b1c2 3120
0fc9a1be 3121 kfree(dwc->setup_buf);
04c03d10 3122 kfree(dwc->zlp_buf);
72246da4 3123
51fbc7c0 3124 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
72246da4
FB		 3125 dwc->ep0_trb, dwc->ep0_trb_addr);
3126
3127 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
3128 dwc->ctrl_req, dwc->ctrl_req_addr);
72246da4 3129}
7415f17c 3130
0b0231aa 3131int dwc3_gadget_suspend(struct dwc3 *dwc)
7415f17c 3132{
9f8a67b6
FB		 3133 int ret;
3134
9772b47a
RQ		 3135 if (!dwc->gadget_driver)
3136 return 0;
3137
9f8a67b6
FB		 3138 ret = dwc3_gadget_run_stop(dwc, false, false);
3139 if (ret < 0)
3140 return ret;
7415f17c 3141
9f8a67b6
FB		 3142 dwc3_disconnect_gadget(dwc);
3143 __dwc3_gadget_stop(dwc);
7415f17c
FB		 3144
3145 return 0;
3146}
3147
3148int dwc3_gadget_resume(struct dwc3 *dwc)
3149{
7415f17c
FB		 3150 int ret;
3151
9772b47a
RQ		 3152 if (!dwc->gadget_driver)
3153 return 0;
3154
9f8a67b6
FB		 3155 ret = __dwc3_gadget_start(dwc);
3156 if (ret < 0)
7415f17c
FB		 3157 goto err0;
3158
9f8a67b6
FB		 3159 ret = dwc3_gadget_run_stop(dwc, true, false);
3160 if (ret < 0)
7415f17c
FB		 3161 goto err1;
3162
7415f17c
FB		 3163 return 0;
3164
3165err1:
9f8a67b6 3166 __dwc3_gadget_stop(dwc);
7415f17c
FB		 3167
3168err0:
3169 return ret;
3170}
fc8bb91b
FB		 3171
3172void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
3173{
3174 if (dwc->pending_events) {
3175 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
3176 dwc->pending_events = false;
3177 enable_irq(dwc->irq_gadget);
3178 }
3179}
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