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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
4 *
5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
6 *
7 * Authors: Felipe Balbi <balbi@ti.com>,
8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
9 */
10
11#include <linux/kernel.h>
12#include <linux/delay.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17#include <linux/interrupt.h>
18#include <linux/io.h>
19#include <linux/list.h>
20#include <linux/dma-mapping.h>
21
22#include <linux/usb/ch9.h>
23#include <linux/usb/gadget.h>
24
25#include "debug.h"
26#include "core.h"
27#include "gadget.h"
28#include "io.h"
29
30#define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \
31 & ~((d)->interval - 1))
32
33/**
34 * dwc3_gadget_set_test_mode - enables usb2 test modes
35 * @dwc: pointer to our context structure
36 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
37 *
38 * Caller should take care of locking. This function will return 0 on
39 * success or -EINVAL if wrong Test Selector is passed.
40 */
41int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
42{
43 u32 reg;
44
45 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
46 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
47
48 switch (mode) {
49 case USB_TEST_J:
50 case USB_TEST_K:
51 case USB_TEST_SE0_NAK:
52 case USB_TEST_PACKET:
53 case USB_TEST_FORCE_ENABLE:
54 reg |= mode << 1;
55 break;
56 default:
57 return -EINVAL;
58 }
59
60 dwc3_gadget_dctl_write_safe(dwc, reg);
61
62 return 0;
63}
64
65/**
66 * dwc3_gadget_get_link_state - gets current state of usb link
67 * @dwc: pointer to our context structure
68 *
69 * Caller should take care of locking. This function will
70 * return the link state on success (>= 0) or -ETIMEDOUT.
71 */
72int dwc3_gadget_get_link_state(struct dwc3 *dwc)
73{
74 u32 reg;
75
76 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
77
78 return DWC3_DSTS_USBLNKST(reg);
79}
80
81/**
82 * dwc3_gadget_set_link_state - sets usb link to a particular state
83 * @dwc: pointer to our context structure
84 * @state: the state to put link into
85 *
86 * Caller should take care of locking. This function will
87 * return 0 on success or -ETIMEDOUT.
88 */
89int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
90{
91 int retries = 10000;
92 u32 reg;
93
94 /*
95 * Wait until device controller is ready. Only applies to 1.94a and
96 * later RTL.
97 */
98 if (!DWC3_VER_IS_PRIOR(DWC3, 194A)) {
99 while (--retries) {
100 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
101 if (reg & DWC3_DSTS_DCNRD)
102 udelay(5);
103 else
104 break;
105 }
106
107 if (retries <= 0)
108 return -ETIMEDOUT;
109 }
110
111 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
112 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
113
114 /* set no action before sending new link state change */
115 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
116
117 /* set requested state */
118 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
119 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
120
121 /*
122 * The following code is racy when called from dwc3_gadget_wakeup,
123 * and is not needed, at least on newer versions
124 */
125 if (!DWC3_VER_IS_PRIOR(DWC3, 194A))
126 return 0;
127
128 /* wait for a change in DSTS */
129 retries = 10000;
130 while (--retries) {
131 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
132
133 if (DWC3_DSTS_USBLNKST(reg) == state)
134 return 0;
135
136 udelay(5);
137 }
138
139 return -ETIMEDOUT;
140}
141
142static void dwc3_ep0_reset_state(struct dwc3 *dwc)
143{
144 unsigned int dir;
145
146 if (dwc->ep0state != EP0_SETUP_PHASE) {
147 dir = !!dwc->ep0_expect_in;
148 if (dwc->ep0state == EP0_DATA_PHASE)
149 dwc3_ep0_end_control_data(dwc, dwc->eps[dir]);
150 else
151 dwc3_ep0_end_control_data(dwc, dwc->eps[!dir]);
152
153 dwc->eps[0]->trb_enqueue = 0;
154 dwc->eps[1]->trb_enqueue = 0;
155
156 dwc3_ep0_stall_and_restart(dwc);
157 }
158}
159
160/**
161 * dwc3_ep_inc_trb - increment a trb index.
162 * @index: Pointer to the TRB index to increment.
163 *
164 * The index should never point to the link TRB. After incrementing,
165 * if it is point to the link TRB, wrap around to the beginning. The
166 * link TRB is always at the last TRB entry.
167 */
168static void dwc3_ep_inc_trb(u8 *index)
169{
170 (*index)++;
171 if (*index == (DWC3_TRB_NUM - 1))
172 *index = 0;
173}
174
175/**
176 * dwc3_ep_inc_enq - increment endpoint's enqueue pointer
177 * @dep: The endpoint whose enqueue pointer we're incrementing
178 */
179static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
180{
181 dwc3_ep_inc_trb(&dep->trb_enqueue);
182}
183
184/**
185 * dwc3_ep_inc_deq - increment endpoint's dequeue pointer
186 * @dep: The endpoint whose enqueue pointer we're incrementing
187 */
188static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
189{
190 dwc3_ep_inc_trb(&dep->trb_dequeue);
191}
192
193static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,
194 struct dwc3_request *req, int status)
195{
196 struct dwc3 *dwc = dep->dwc;
197
198 list_del(&req->list);
199 req->remaining = 0;
200 req->needs_extra_trb = false;
201 req->num_trbs = 0;
202
203 if (req->request.status == -EINPROGRESS)
204 req->request.status = status;
205
206 if (req->trb)
207 usb_gadget_unmap_request_by_dev(dwc->sysdev,
208 &req->request, req->direction);
209
210 req->trb = NULL;
211 trace_dwc3_gadget_giveback(req);
212
213 if (dep->number > 1)
214 pm_runtime_put(dwc->dev);
215}
216
217/**
218 * dwc3_gadget_giveback - call struct usb_request's ->complete callback
219 * @dep: The endpoint to whom the request belongs to
220 * @req: The request we're giving back
221 * @status: completion code for the request
222 *
223 * Must be called with controller's lock held and interrupts disabled. This
224 * function will unmap @req and call its ->complete() callback to notify upper
225 * layers that it has completed.
226 */
227void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
228 int status)
229{
230 struct dwc3 *dwc = dep->dwc;
231
232 dwc3_gadget_del_and_unmap_request(dep, req, status);
233 req->status = DWC3_REQUEST_STATUS_COMPLETED;
234
235 spin_unlock(&dwc->lock);
236 usb_gadget_giveback_request(&dep->endpoint, &req->request);
237 spin_lock(&dwc->lock);
238}
239
240/**
241 * dwc3_send_gadget_generic_command - issue a generic command for the controller
242 * @dwc: pointer to the controller context
243 * @cmd: the command to be issued
244 * @param: command parameter
245 *
246 * Caller should take care of locking. Issue @cmd with a given @param to @dwc
247 * and wait for its completion.
248 */
249int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd,
250 u32 param)
251{
252 u32 timeout = 500;
253 int status = 0;
254 int ret = 0;
255 u32 reg;
256
257 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
258 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
259
260 do {
261 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
262 if (!(reg & DWC3_DGCMD_CMDACT)) {
263 status = DWC3_DGCMD_STATUS(reg);
264 if (status)
265 ret = -EINVAL;
266 break;
267 }
268 } while (--timeout);
269
270 if (!timeout) {
271 ret = -ETIMEDOUT;
272 status = -ETIMEDOUT;
273 }
274
275 trace_dwc3_gadget_generic_cmd(cmd, param, status);
276
277 return ret;
278}
279
280static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async);
281
282/**
283 * dwc3_send_gadget_ep_cmd - issue an endpoint command
284 * @dep: the endpoint to which the command is going to be issued
285 * @cmd: the command to be issued
286 * @params: parameters to the command
287 *
288 * Caller should handle locking. This function will issue @cmd with given
289 * @params to @dep and wait for its completion.
290 */
291int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
292 struct dwc3_gadget_ep_cmd_params *params)
293{
294 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
295 struct dwc3 *dwc = dep->dwc;
296 u32 timeout = 5000;
297 u32 saved_config = 0;
298 u32 reg;
299
300 int cmd_status = 0;
301 int ret = -EINVAL;
302
303 /*
304 * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
305 * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an
306 * endpoint command.
307 *
308 * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY
309 * settings. Restore them after the command is completed.
310 *
311 * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2
312 */
313 if (dwc->gadget->speed <= USB_SPEED_HIGH ||
314 DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER) {
315 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
316 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
317 saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;
318 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
319 }
320
321 if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {
322 saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;
323 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
324 }
325
326 if (saved_config)
327 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
328 }
329
330 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
331 int link_state;
332
333 /*
334 * Initiate remote wakeup if the link state is in U3 when
335 * operating in SS/SSP or L1/L2 when operating in HS/FS. If the
336 * link state is in U1/U2, no remote wakeup is needed. The Start
337 * Transfer command will initiate the link recovery.
338 */
339 link_state = dwc3_gadget_get_link_state(dwc);
340 switch (link_state) {
341 case DWC3_LINK_STATE_U2:
342 if (dwc->gadget->speed >= USB_SPEED_SUPER)
343 break;
344
345 fallthrough;
346 case DWC3_LINK_STATE_U3:
347 ret = __dwc3_gadget_wakeup(dwc, false);
348 dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
349 ret);
350 break;
351 }
352 }
353
354 /*
355 * For some commands such as Update Transfer command, DEPCMDPARn
356 * registers are reserved. Since the driver often sends Update Transfer
357 * command, don't write to DEPCMDPARn to avoid register write delays and
358 * improve performance.
359 */
360 if (DWC3_DEPCMD_CMD(cmd) != DWC3_DEPCMD_UPDATETRANSFER) {
361 dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
362 dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
363 dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
364 }
365
366 /*
367 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
368 * not relying on XferNotReady, we can make use of a special "No
369 * Response Update Transfer" command where we should clear both CmdAct
370 * and CmdIOC bits.
371 *
372 * With this, we don't need to wait for command completion and can
373 * straight away issue further commands to the endpoint.
374 *
375 * NOTICE: We're making an assumption that control endpoints will never
376 * make use of Update Transfer command. This is a safe assumption
377 * because we can never have more than one request at a time with
378 * Control Endpoints. If anybody changes that assumption, this chunk
379 * needs to be updated accordingly.
380 */
381 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
382 !usb_endpoint_xfer_isoc(desc))
383 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
384 else
385 cmd |= DWC3_DEPCMD_CMDACT;
386
387 dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
388
389 if (!(cmd & DWC3_DEPCMD_CMDACT) ||
390 (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER &&
391 !(cmd & DWC3_DEPCMD_CMDIOC))) {
392 ret = 0;
393 goto skip_status;
394 }
395
396 do {
397 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
398 if (!(reg & DWC3_DEPCMD_CMDACT)) {
399 cmd_status = DWC3_DEPCMD_STATUS(reg);
400
401 switch (cmd_status) {
402 case 0:
403 ret = 0;
404 break;
405 case DEPEVT_TRANSFER_NO_RESOURCE:
406 dev_WARN(dwc->dev, "No resource for %s\n",
407 dep->name);
408 ret = -EINVAL;
409 break;
410 case DEPEVT_TRANSFER_BUS_EXPIRY:
411 /*
412 * SW issues START TRANSFER command to
413 * isochronous ep with future frame interval. If
414 * future interval time has already passed when
415 * core receives the command, it will respond
416 * with an error status of 'Bus Expiry'.
417 *
418 * Instead of always returning -EINVAL, let's
419 * give a hint to the gadget driver that this is
420 * the case by returning -EAGAIN.
421 */
422 ret = -EAGAIN;
423 break;
424 default:
425 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
426 }
427
428 break;
429 }
430 } while (--timeout);
431
432 if (timeout == 0) {
433 ret = -ETIMEDOUT;
434 cmd_status = -ETIMEDOUT;
435 }
436
437skip_status:
438 trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
439
440 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
441 if (ret == 0)
442 dep->flags |= DWC3_EP_TRANSFER_STARTED;
443
444 if (ret != -ETIMEDOUT)
445 dwc3_gadget_ep_get_transfer_index(dep);
446 }
447
448 if (saved_config) {
449 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
450 reg |= saved_config;
451 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
452 }
453
454 return ret;
455}
456
457static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
458{
459 struct dwc3 *dwc = dep->dwc;
460 struct dwc3_gadget_ep_cmd_params params;
461 u32 cmd = DWC3_DEPCMD_CLEARSTALL;
462
463 /*
464 * As of core revision 2.60a the recommended programming model
465 * is to set the ClearPendIN bit when issuing a Clear Stall EP
466 * command for IN endpoints. This is to prevent an issue where
467 * some (non-compliant) hosts may not send ACK TPs for pending
468 * IN transfers due to a mishandled error condition. Synopsys
469 * STAR 9000614252.
470 */
471 if (dep->direction &&
472 !DWC3_VER_IS_PRIOR(DWC3, 260A) &&
473 (dwc->gadget->speed >= USB_SPEED_SUPER))
474 cmd |= DWC3_DEPCMD_CLEARPENDIN;
475
476 memset(¶ms, 0, sizeof(params));
477
478 return dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
479}
480
481static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
482 struct dwc3_trb *trb)
483{
484 u32 offset = (char *) trb - (char *) dep->trb_pool;
485
486 return dep->trb_pool_dma + offset;
487}
488
489static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
490{
491 struct dwc3 *dwc = dep->dwc;
492
493 if (dep->trb_pool)
494 return 0;
495
496 dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
497 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
498 &dep->trb_pool_dma, GFP_KERNEL);
499 if (!dep->trb_pool) {
500 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
501 dep->name);
502 return -ENOMEM;
503 }
504
505 return 0;
506}
507
508static void dwc3_free_trb_pool(struct dwc3_ep *dep)
509{
510 struct dwc3 *dwc = dep->dwc;
511
512 dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
513 dep->trb_pool, dep->trb_pool_dma);
514
515 dep->trb_pool = NULL;
516 dep->trb_pool_dma = 0;
517}
518
519static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
520{
521 struct dwc3_gadget_ep_cmd_params params;
522 int ret;
523
524 if (dep->flags & DWC3_EP_RESOURCE_ALLOCATED)
525 return 0;
526
527 memset(¶ms, 0x00, sizeof(params));
528
529 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
530
531 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
532 ¶ms);
533 if (ret)
534 return ret;
535
536 dep->flags |= DWC3_EP_RESOURCE_ALLOCATED;
537 return 0;
538}
539
540/**
541 * dwc3_gadget_start_config - reset endpoint resources
542 * @dwc: pointer to the DWC3 context
543 * @resource_index: DEPSTARTCFG.XferRscIdx value (must be 0 or 2)
544 *
545 * Set resource_index=0 to reset all endpoints' resources allocation. Do this as
546 * part of the power-on/soft-reset initialization.
547 *
548 * Set resource_index=2 to reset only non-control endpoints' resources. Do this
549 * on receiving the SET_CONFIGURATION request or hibernation resume.
550 */
551int dwc3_gadget_start_config(struct dwc3 *dwc, unsigned int resource_index)
552{
553 struct dwc3_gadget_ep_cmd_params params;
554 u32 cmd;
555 int i;
556 int ret;
557
558 if (resource_index != 0 && resource_index != 2)
559 return -EINVAL;
560
561 memset(¶ms, 0x00, sizeof(params));
562 cmd = DWC3_DEPCMD_DEPSTARTCFG;
563 cmd |= DWC3_DEPCMD_PARAM(resource_index);
564
565 ret = dwc3_send_gadget_ep_cmd(dwc->eps[0], cmd, ¶ms);
566 if (ret)
567 return ret;
568
569 /* Reset resource allocation flags */
570 for (i = resource_index; i < dwc->num_eps && dwc->eps[i]; i++)
571 dwc->eps[i]->flags &= ~DWC3_EP_RESOURCE_ALLOCATED;
572
573 return 0;
574}
575
576static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
577{
578 const struct usb_ss_ep_comp_descriptor *comp_desc;
579 const struct usb_endpoint_descriptor *desc;
580 struct dwc3_gadget_ep_cmd_params params;
581 struct dwc3 *dwc = dep->dwc;
582
583 comp_desc = dep->endpoint.comp_desc;
584 desc = dep->endpoint.desc;
585
586 memset(¶ms, 0x00, sizeof(params));
587
588 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
589 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
590
591 /* Burst size is only needed in SuperSpeed mode */
592 if (dwc->gadget->speed >= USB_SPEED_SUPER) {
593 u32 burst = dep->endpoint.maxburst;
594
595 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
596 }
597
598 params.param0 |= action;
599 if (action == DWC3_DEPCFG_ACTION_RESTORE)
600 params.param2 |= dep->saved_state;
601
602 if (usb_endpoint_xfer_control(desc))
603 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
604
605 if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
606 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
607
608 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
609 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
610 | DWC3_DEPCFG_XFER_COMPLETE_EN
611 | DWC3_DEPCFG_STREAM_EVENT_EN;
612 dep->stream_capable = true;
613 }
614
615 if (!usb_endpoint_xfer_control(desc))
616 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
617
618 /*
619 * We are doing 1:1 mapping for endpoints, meaning
620 * Physical Endpoints 2 maps to Logical Endpoint 2 and
621 * so on. We consider the direction bit as part of the physical
622 * endpoint number. So USB endpoint 0x81 is 0x03.
623 */
624 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
625
626 /*
627 * We must use the lower 16 TX FIFOs even though
628 * HW might have more
629 */
630 if (dep->direction)
631 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
632
633 if (desc->bInterval) {
634 u8 bInterval_m1;
635
636 /*
637 * Valid range for DEPCFG.bInterval_m1 is from 0 to 13.
638 *
639 * NOTE: The programming guide incorrectly stated bInterval_m1
640 * must be set to 0 when operating in fullspeed. Internally the
641 * controller does not have this limitation. See DWC_usb3x
642 * programming guide section 3.2.2.1.
643 */
644 bInterval_m1 = min_t(u8, desc->bInterval - 1, 13);
645
646 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
647 dwc->gadget->speed == USB_SPEED_FULL)
648 dep->interval = desc->bInterval;
649 else
650 dep->interval = 1 << (desc->bInterval - 1);
651
652 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1);
653 }
654
655 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, ¶ms);
656}
657
658/**
659 * dwc3_gadget_calc_tx_fifo_size - calculates the txfifo size value
660 * @dwc: pointer to the DWC3 context
661 * @mult: multiplier to be used when calculating the fifo_size
662 *
663 * Calculates the size value based on the equation below:
664 *
665 * DWC3 revision 280A and prior:
666 * fifo_size = mult * (max_packet / mdwidth) + 1;
667 *
668 * DWC3 revision 290A and onwards:
669 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
670 *
671 * The max packet size is set to 1024, as the txfifo requirements mainly apply
672 * to super speed USB use cases. However, it is safe to overestimate the fifo
673 * allocations for other scenarios, i.e. high speed USB.
674 */
675static int dwc3_gadget_calc_tx_fifo_size(struct dwc3 *dwc, int mult)
676{
677 int max_packet = 1024;
678 int fifo_size;
679 int mdwidth;
680
681 mdwidth = dwc3_mdwidth(dwc);
682
683 /* MDWIDTH is represented in bits, we need it in bytes */
684 mdwidth >>= 3;
685
686 if (DWC3_VER_IS_PRIOR(DWC3, 290A))
687 fifo_size = mult * (max_packet / mdwidth) + 1;
688 else
689 fifo_size = mult * ((max_packet + mdwidth) / mdwidth) + 1;
690 return fifo_size;
691}
692
693/**
694 * dwc3_gadget_clear_tx_fifos - Clears txfifo allocation
695 * @dwc: pointer to the DWC3 context
696 *
697 * Iterates through all the endpoint registers and clears the previous txfifo
698 * allocations.
699 */
700void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
701{
702 struct dwc3_ep *dep;
703 int fifo_depth;
704 int size;
705 int num;
706
707 if (!dwc->do_fifo_resize)
708 return;
709
710 /* Read ep0IN related TXFIFO size */
711 dep = dwc->eps[1];
712 size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
713 if (DWC3_IP_IS(DWC3))
714 fifo_depth = DWC3_GTXFIFOSIZ_TXFDEP(size);
715 else
716 fifo_depth = DWC31_GTXFIFOSIZ_TXFDEP(size);
717
718 dwc->last_fifo_depth = fifo_depth;
719 /* Clear existing TXFIFO for all IN eps except ep0 */
720 for (num = 3; num < min_t(int, dwc->num_eps, DWC3_ENDPOINTS_NUM);
721 num += 2) {
722 dep = dwc->eps[num];
723 /* Don't change TXFRAMNUM on usb31 version */
724 size = DWC3_IP_IS(DWC3) ? 0 :
725 dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1)) &
726 DWC31_GTXFIFOSIZ_TXFRAMNUM;
727
728 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size);
729 dep->flags &= ~DWC3_EP_TXFIFO_RESIZED;
730 }
731 dwc->num_ep_resized = 0;
732}
733
734/*
735 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
736 * @dwc: pointer to our context structure
737 *
738 * This function will a best effort FIFO allocation in order
739 * to improve FIFO usage and throughput, while still allowing
740 * us to enable as many endpoints as possible.
741 *
742 * Keep in mind that this operation will be highly dependent
743 * on the configured size for RAM1 - which contains TxFifo -,
744 * the amount of endpoints enabled on coreConsultant tool, and
745 * the width of the Master Bus.
746 *
747 * In general, FIFO depths are represented with the following equation:
748 *
749 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
750 *
751 * In conjunction with dwc3_gadget_check_config(), this resizing logic will
752 * ensure that all endpoints will have enough internal memory for one max
753 * packet per endpoint.
754 */
755static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
756{
757 struct dwc3 *dwc = dep->dwc;
758 int fifo_0_start;
759 int ram1_depth;
760 int fifo_size;
761 int min_depth;
762 int num_in_ep;
763 int remaining;
764 int num_fifos = 1;
765 int fifo;
766 int tmp;
767
768 if (!dwc->do_fifo_resize)
769 return 0;
770
771 /* resize IN endpoints except ep0 */
772 if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1)
773 return 0;
774
775 /* bail if already resized */
776 if (dep->flags & DWC3_EP_TXFIFO_RESIZED)
777 return 0;
778
779 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
780
781 if ((dep->endpoint.maxburst > 1 &&
782 usb_endpoint_xfer_bulk(dep->endpoint.desc)) ||
783 usb_endpoint_xfer_isoc(dep->endpoint.desc))
784 num_fifos = 3;
785
786 if (dep->endpoint.maxburst > 6 &&
787 (usb_endpoint_xfer_bulk(dep->endpoint.desc) ||
788 usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31))
789 num_fifos = dwc->tx_fifo_resize_max_num;
790
791 /* FIFO size for a single buffer */
792 fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1);
793
794 /* Calculate the number of remaining EPs w/o any FIFO */
795 num_in_ep = dwc->max_cfg_eps;
796 num_in_ep -= dwc->num_ep_resized;
797
798 /* Reserve at least one FIFO for the number of IN EPs */
799 min_depth = num_in_ep * (fifo + 1);
800 remaining = ram1_depth - min_depth - dwc->last_fifo_depth;
801 remaining = max_t(int, 0, remaining);
802 /*
803 * We've already reserved 1 FIFO per EP, so check what we can fit in
804 * addition to it. If there is not enough remaining space, allocate
805 * all the remaining space to the EP.
806 */
807 fifo_size = (num_fifos - 1) * fifo;
808 if (remaining < fifo_size)
809 fifo_size = remaining;
810
811 fifo_size += fifo;
812 /* Last increment according to the TX FIFO size equation */
813 fifo_size++;
814
815 /* Check if TXFIFOs start at non-zero addr */
816 tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
817 fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp);
818
819 fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16));
820 if (DWC3_IP_IS(DWC3))
821 dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
822 else
823 dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
824
825 /* Check fifo size allocation doesn't exceed available RAM size. */
826 if (dwc->last_fifo_depth >= ram1_depth) {
827 dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n",
828 dwc->last_fifo_depth, ram1_depth,
829 dep->endpoint.name, fifo_size);
830 if (DWC3_IP_IS(DWC3))
831 fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
832 else
833 fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
834
835 dwc->last_fifo_depth -= fifo_size;
836 return -ENOMEM;
837 }
838
839 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size);
840 dep->flags |= DWC3_EP_TXFIFO_RESIZED;
841 dwc->num_ep_resized++;
842
843 return 0;
844}
845
846/**
847 * __dwc3_gadget_ep_enable - initializes a hw endpoint
848 * @dep: endpoint to be initialized
849 * @action: one of INIT, MODIFY or RESTORE
850 *
851 * Caller should take care of locking. Execute all necessary commands to
852 * initialize a HW endpoint so it can be used by a gadget driver.
853 */
854static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
855{
856 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
857 struct dwc3 *dwc = dep->dwc;
858
859 u32 reg;
860 int ret;
861
862 if (!(dep->flags & DWC3_EP_ENABLED)) {
863 ret = dwc3_gadget_resize_tx_fifos(dep);
864 if (ret)
865 return ret;
866 }
867
868 ret = dwc3_gadget_set_ep_config(dep, action);
869 if (ret)
870 return ret;
871
872 if (!(dep->flags & DWC3_EP_RESOURCE_ALLOCATED)) {
873 ret = dwc3_gadget_set_xfer_resource(dep);
874 if (ret)
875 return ret;
876 }
877
878 if (!(dep->flags & DWC3_EP_ENABLED)) {
879 struct dwc3_trb *trb_st_hw;
880 struct dwc3_trb *trb_link;
881
882 dep->type = usb_endpoint_type(desc);
883 dep->flags |= DWC3_EP_ENABLED;
884
885 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
886 reg |= DWC3_DALEPENA_EP(dep->number);
887 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
888
889 dep->trb_dequeue = 0;
890 dep->trb_enqueue = 0;
891
892 if (usb_endpoint_xfer_control(desc))
893 goto out;
894
895 /* Initialize the TRB ring */
896 memset(dep->trb_pool, 0,
897 sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
898
899 /* Link TRB. The HWO bit is never reset */
900 trb_st_hw = &dep->trb_pool[0];
901
902 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
903 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
904 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
905 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
906 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
907 }
908
909 /*
910 * Issue StartTransfer here with no-op TRB so we can always rely on No
911 * Response Update Transfer command.
912 */
913 if (usb_endpoint_xfer_bulk(desc) ||
914 usb_endpoint_xfer_int(desc)) {
915 struct dwc3_gadget_ep_cmd_params params;
916 struct dwc3_trb *trb;
917 dma_addr_t trb_dma;
918 u32 cmd;
919
920 memset(¶ms, 0, sizeof(params));
921 trb = &dep->trb_pool[0];
922 trb_dma = dwc3_trb_dma_offset(dep, trb);
923
924 params.param0 = upper_32_bits(trb_dma);
925 params.param1 = lower_32_bits(trb_dma);
926
927 cmd = DWC3_DEPCMD_STARTTRANSFER;
928
929 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
930 if (ret < 0)
931 return ret;
932
933 if (dep->stream_capable) {
934 /*
935 * For streams, at start, there maybe a race where the
936 * host primes the endpoint before the function driver
937 * queues a request to initiate a stream. In that case,
938 * the controller will not see the prime to generate the
939 * ERDY and start stream. To workaround this, issue a
940 * no-op TRB as normal, but end it immediately. As a
941 * result, when the function driver queues the request,
942 * the next START_TRANSFER command will cause the
943 * controller to generate an ERDY to initiate the
944 * stream.
945 */
946 dwc3_stop_active_transfer(dep, true, true);
947
948 /*
949 * All stream eps will reinitiate stream on NoStream
950 * rejection until we can determine that the host can
951 * prime after the first transfer.
952 *
953 * However, if the controller is capable of
954 * TXF_FLUSH_BYPASS, then IN direction endpoints will
955 * automatically restart the stream without the driver
956 * initiation.
957 */
958 if (!dep->direction ||
959 !(dwc->hwparams.hwparams9 &
960 DWC3_GHWPARAMS9_DEV_TXF_FLUSH_BYPASS))
961 dep->flags |= DWC3_EP_FORCE_RESTART_STREAM;
962 }
963 }
964
965out:
966 trace_dwc3_gadget_ep_enable(dep);
967
968 return 0;
969}
970
971void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep, int status)
972{
973 struct dwc3_request *req;
974
975 dwc3_stop_active_transfer(dep, true, false);
976
977 /* If endxfer is delayed, avoid unmapping requests */
978 if (dep->flags & DWC3_EP_DELAY_STOP)
979 return;
980
981 /* - giveback all requests to gadget driver */
982 while (!list_empty(&dep->started_list)) {
983 req = next_request(&dep->started_list);
984
985 dwc3_gadget_giveback(dep, req, status);
986 }
987
988 while (!list_empty(&dep->pending_list)) {
989 req = next_request(&dep->pending_list);
990
991 dwc3_gadget_giveback(dep, req, status);
992 }
993
994 while (!list_empty(&dep->cancelled_list)) {
995 req = next_request(&dep->cancelled_list);
996
997 dwc3_gadget_giveback(dep, req, status);
998 }
999}
1000
1001/**
1002 * __dwc3_gadget_ep_disable - disables a hw endpoint
1003 * @dep: the endpoint to disable
1004 *
1005 * This function undoes what __dwc3_gadget_ep_enable did and also removes
1006 * requests which are currently being processed by the hardware and those which
1007 * are not yet scheduled.
1008 *
1009 * Caller should take care of locking.
1010 */
1011static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
1012{
1013 struct dwc3 *dwc = dep->dwc;
1014 u32 reg;
1015 u32 mask;
1016
1017 trace_dwc3_gadget_ep_disable(dep);
1018
1019 /* make sure HW endpoint isn't stalled */
1020 if (dep->flags & DWC3_EP_STALL)
1021 __dwc3_gadget_ep_set_halt(dep, 0, false);
1022
1023 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
1024 reg &= ~DWC3_DALEPENA_EP(dep->number);
1025 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
1026
1027 dwc3_remove_requests(dwc, dep, -ESHUTDOWN);
1028
1029 dep->stream_capable = false;
1030 dep->type = 0;
1031 mask = DWC3_EP_TXFIFO_RESIZED | DWC3_EP_RESOURCE_ALLOCATED;
1032 /*
1033 * dwc3_remove_requests() can exit early if DWC3 EP delayed stop is
1034 * set. Do not clear DEP flags, so that the end transfer command will
1035 * be reattempted during the next SETUP stage.
1036 */
1037 if (dep->flags & DWC3_EP_DELAY_STOP)
1038 mask |= (DWC3_EP_DELAY_STOP | DWC3_EP_TRANSFER_STARTED);
1039 dep->flags &= mask;
1040
1041 /* Clear out the ep descriptors for non-ep0 */
1042 if (dep->number > 1) {
1043 dep->endpoint.comp_desc = NULL;
1044 dep->endpoint.desc = NULL;
1045 }
1046
1047 return 0;
1048}
1049
1050/* -------------------------------------------------------------------------- */
1051
1052static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
1053 const struct usb_endpoint_descriptor *desc)
1054{
1055 return -EINVAL;
1056}
1057
1058static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
1059{
1060 return -EINVAL;
1061}
1062
1063/* -------------------------------------------------------------------------- */
1064
1065static int dwc3_gadget_ep_enable(struct usb_ep *ep,
1066 const struct usb_endpoint_descriptor *desc)
1067{
1068 struct dwc3_ep *dep;
1069 struct dwc3 *dwc;
1070 unsigned long flags;
1071 int ret;
1072
1073 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1074 pr_debug("dwc3: invalid parameters\n");
1075 return -EINVAL;
1076 }
1077
1078 if (!desc->wMaxPacketSize) {
1079 pr_debug("dwc3: missing wMaxPacketSize\n");
1080 return -EINVAL;
1081 }
1082
1083 dep = to_dwc3_ep(ep);
1084 dwc = dep->dwc;
1085
1086 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
1087 "%s is already enabled\n",
1088 dep->name))
1089 return 0;
1090
1091 spin_lock_irqsave(&dwc->lock, flags);
1092 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
1093 spin_unlock_irqrestore(&dwc->lock, flags);
1094
1095 return ret;
1096}
1097
1098static int dwc3_gadget_ep_disable(struct usb_ep *ep)
1099{
1100 struct dwc3_ep *dep;
1101 struct dwc3 *dwc;
1102 unsigned long flags;
1103 int ret;
1104
1105 if (!ep) {
1106 pr_debug("dwc3: invalid parameters\n");
1107 return -EINVAL;
1108 }
1109
1110 dep = to_dwc3_ep(ep);
1111 dwc = dep->dwc;
1112
1113 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
1114 "%s is already disabled\n",
1115 dep->name))
1116 return 0;
1117
1118 spin_lock_irqsave(&dwc->lock, flags);
1119 ret = __dwc3_gadget_ep_disable(dep);
1120 spin_unlock_irqrestore(&dwc->lock, flags);
1121
1122 return ret;
1123}
1124
1125static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
1126 gfp_t gfp_flags)
1127{
1128 struct dwc3_request *req;
1129 struct dwc3_ep *dep = to_dwc3_ep(ep);
1130
1131 req = kzalloc(sizeof(*req), gfp_flags);
1132 if (!req)
1133 return NULL;
1134
1135 req->direction = dep->direction;
1136 req->epnum = dep->number;
1137 req->dep = dep;
1138 req->status = DWC3_REQUEST_STATUS_UNKNOWN;
1139
1140 trace_dwc3_alloc_request(req);
1141
1142 return &req->request;
1143}
1144
1145static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
1146 struct usb_request *request)
1147{
1148 struct dwc3_request *req = to_dwc3_request(request);
1149
1150 trace_dwc3_free_request(req);
1151 kfree(req);
1152}
1153
1154/**
1155 * dwc3_ep_prev_trb - returns the previous TRB in the ring
1156 * @dep: The endpoint with the TRB ring
1157 * @index: The index of the current TRB in the ring
1158 *
1159 * Returns the TRB prior to the one pointed to by the index. If the
1160 * index is 0, we will wrap backwards, skip the link TRB, and return
1161 * the one just before that.
1162 */
1163static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
1164{
1165 u8 tmp = index;
1166
1167 if (!tmp)
1168 tmp = DWC3_TRB_NUM - 1;
1169
1170 return &dep->trb_pool[tmp - 1];
1171}
1172
1173static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
1174{
1175 u8 trbs_left;
1176
1177 /*
1178 * If the enqueue & dequeue are equal then the TRB ring is either full
1179 * or empty. It's considered full when there are DWC3_TRB_NUM-1 of TRBs
1180 * pending to be processed by the driver.
1181 */
1182 if (dep->trb_enqueue == dep->trb_dequeue) {
1183 /*
1184 * If there is any request remained in the started_list at
1185 * this point, that means there is no TRB available.
1186 */
1187 if (!list_empty(&dep->started_list))
1188 return 0;
1189
1190 return DWC3_TRB_NUM - 1;
1191 }
1192
1193 trbs_left = dep->trb_dequeue - dep->trb_enqueue;
1194 trbs_left &= (DWC3_TRB_NUM - 1);
1195
1196 if (dep->trb_dequeue < dep->trb_enqueue)
1197 trbs_left--;
1198
1199 return trbs_left;
1200}
1201
1202/**
1203 * dwc3_prepare_one_trb - setup one TRB from one request
1204 * @dep: endpoint for which this request is prepared
1205 * @req: dwc3_request pointer
1206 * @trb_length: buffer size of the TRB
1207 * @chain: should this TRB be chained to the next?
1208 * @node: only for isochronous endpoints. First TRB needs different type.
1209 * @use_bounce_buffer: set to use bounce buffer
1210 * @must_interrupt: set to interrupt on TRB completion
1211 */
1212static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
1213 struct dwc3_request *req, unsigned int trb_length,
1214 unsigned int chain, unsigned int node, bool use_bounce_buffer,
1215 bool must_interrupt)
1216{
1217 struct dwc3_trb *trb;
1218 dma_addr_t dma;
1219 unsigned int stream_id = req->request.stream_id;
1220 unsigned int short_not_ok = req->request.short_not_ok;
1221 unsigned int no_interrupt = req->request.no_interrupt;
1222 unsigned int is_last = req->request.is_last;
1223 struct dwc3 *dwc = dep->dwc;
1224 struct usb_gadget *gadget = dwc->gadget;
1225 enum usb_device_speed speed = gadget->speed;
1226
1227 if (use_bounce_buffer)
1228 dma = dep->dwc->bounce_addr;
1229 else if (req->request.num_sgs > 0)
1230 dma = sg_dma_address(req->start_sg);
1231 else
1232 dma = req->request.dma;
1233
1234 trb = &dep->trb_pool[dep->trb_enqueue];
1235
1236 if (!req->trb) {
1237 dwc3_gadget_move_started_request(req);
1238 req->trb = trb;
1239 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
1240 }
1241
1242 req->num_trbs++;
1243
1244 trb->size = DWC3_TRB_SIZE_LENGTH(trb_length);
1245 trb->bpl = lower_32_bits(dma);
1246 trb->bph = upper_32_bits(dma);
1247
1248 switch (usb_endpoint_type(dep->endpoint.desc)) {
1249 case USB_ENDPOINT_XFER_CONTROL:
1250 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
1251 break;
1252
1253 case USB_ENDPOINT_XFER_ISOC:
1254 if (!node) {
1255 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
1256
1257 /*
1258 * USB Specification 2.0 Section 5.9.2 states that: "If
1259 * there is only a single transaction in the microframe,
1260 * only a DATA0 data packet PID is used. If there are
1261 * two transactions per microframe, DATA1 is used for
1262 * the first transaction data packet and DATA0 is used
1263 * for the second transaction data packet. If there are
1264 * three transactions per microframe, DATA2 is used for
1265 * the first transaction data packet, DATA1 is used for
1266 * the second, and DATA0 is used for the third."
1267 *
1268 * IOW, we should satisfy the following cases:
1269 *
1270 * 1) length <= maxpacket
1271 * - DATA0
1272 *
1273 * 2) maxpacket < length <= (2 * maxpacket)
1274 * - DATA1, DATA0
1275 *
1276 * 3) (2 * maxpacket) < length <= (3 * maxpacket)
1277 * - DATA2, DATA1, DATA0
1278 */
1279 if (speed == USB_SPEED_HIGH) {
1280 struct usb_ep *ep = &dep->endpoint;
1281 unsigned int mult = 2;
1282 unsigned int maxp = usb_endpoint_maxp(ep->desc);
1283
1284 if (req->request.length <= (2 * maxp))
1285 mult--;
1286
1287 if (req->request.length <= maxp)
1288 mult--;
1289
1290 trb->size |= DWC3_TRB_SIZE_PCM1(mult);
1291 }
1292 } else {
1293 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
1294 }
1295
1296 if (!no_interrupt && !chain)
1297 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
1298 break;
1299
1300 case USB_ENDPOINT_XFER_BULK:
1301 case USB_ENDPOINT_XFER_INT:
1302 trb->ctrl = DWC3_TRBCTL_NORMAL;
1303 break;
1304 default:
1305 /*
1306 * This is only possible with faulty memory because we
1307 * checked it already :)
1308 */
1309 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
1310 usb_endpoint_type(dep->endpoint.desc));
1311 }
1312
1313 /*
1314 * Enable Continue on Short Packet
1315 * when endpoint is not a stream capable
1316 */
1317 if (usb_endpoint_dir_out(dep->endpoint.desc)) {
1318 if (!dep->stream_capable)
1319 trb->ctrl |= DWC3_TRB_CTRL_CSP;
1320
1321 if (short_not_ok)
1322 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
1323 }
1324
1325 /* All TRBs setup for MST must set CSP=1 when LST=0 */
1326 if (dep->stream_capable && DWC3_MST_CAPABLE(&dwc->hwparams))
1327 trb->ctrl |= DWC3_TRB_CTRL_CSP;
1328
1329 if ((!no_interrupt && !chain) || must_interrupt)
1330 trb->ctrl |= DWC3_TRB_CTRL_IOC;
1331
1332 if (chain)
1333 trb->ctrl |= DWC3_TRB_CTRL_CHN;
1334 else if (dep->stream_capable && is_last &&
1335 !DWC3_MST_CAPABLE(&dwc->hwparams))
1336 trb->ctrl |= DWC3_TRB_CTRL_LST;
1337
1338 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
1339 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
1340
1341 /*
1342 * As per data book 4.2.3.2TRB Control Bit Rules section
1343 *
1344 * The controller autonomously checks the HWO field of a TRB to determine if the
1345 * entire TRB is valid. Therefore, software must ensure that the rest of the TRB
1346 * is valid before setting the HWO field to '1'. In most systems, this means that
1347 * software must update the fourth DWORD of a TRB last.
1348 *
1349 * However there is a possibility of CPU re-ordering here which can cause
1350 * controller to observe the HWO bit set prematurely.
1351 * Add a write memory barrier to prevent CPU re-ordering.
1352 */
1353 wmb();
1354 trb->ctrl |= DWC3_TRB_CTRL_HWO;
1355
1356 dwc3_ep_inc_enq(dep);
1357
1358 trace_dwc3_prepare_trb(dep, trb);
1359}
1360
1361static bool dwc3_needs_extra_trb(struct dwc3_ep *dep, struct dwc3_request *req)
1362{
1363 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1364 unsigned int rem = req->request.length % maxp;
1365
1366 if ((req->request.length && req->request.zero && !rem &&
1367 !usb_endpoint_xfer_isoc(dep->endpoint.desc)) ||
1368 (!req->direction && rem))
1369 return true;
1370
1371 return false;
1372}
1373
1374/**
1375 * dwc3_prepare_last_sg - prepare TRBs for the last SG entry
1376 * @dep: The endpoint that the request belongs to
1377 * @req: The request to prepare
1378 * @entry_length: The last SG entry size
1379 * @node: Indicates whether this is not the first entry (for isoc only)
1380 *
1381 * Return the number of TRBs prepared.
1382 */
1383static int dwc3_prepare_last_sg(struct dwc3_ep *dep,
1384 struct dwc3_request *req, unsigned int entry_length,
1385 unsigned int node)
1386{
1387 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1388 unsigned int rem = req->request.length % maxp;
1389 unsigned int num_trbs = 1;
1390
1391 if (dwc3_needs_extra_trb(dep, req))
1392 num_trbs++;
1393
1394 if (dwc3_calc_trbs_left(dep) < num_trbs)
1395 return 0;
1396
1397 req->needs_extra_trb = num_trbs > 1;
1398
1399 /* Prepare a normal TRB */
1400 if (req->direction || req->request.length)
1401 dwc3_prepare_one_trb(dep, req, entry_length,
1402 req->needs_extra_trb, node, false, false);
1403
1404 /* Prepare extra TRBs for ZLP and MPS OUT transfer alignment */
1405 if ((!req->direction && !req->request.length) || req->needs_extra_trb)
1406 dwc3_prepare_one_trb(dep, req,
1407 req->direction ? 0 : maxp - rem,
1408 false, 1, true, false);
1409
1410 return num_trbs;
1411}
1412
1413static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,
1414 struct dwc3_request *req)
1415{
1416 struct scatterlist *sg = req->start_sg;
1417 struct scatterlist *s;
1418 int i;
1419 unsigned int length = req->request.length;
1420 unsigned int remaining = req->request.num_mapped_sgs
1421 - req->num_queued_sgs;
1422 unsigned int num_trbs = req->num_trbs;
1423 bool needs_extra_trb = dwc3_needs_extra_trb(dep, req);
1424
1425 /*
1426 * If we resume preparing the request, then get the remaining length of
1427 * the request and resume where we left off.
1428 */
1429 for_each_sg(req->request.sg, s, req->num_queued_sgs, i)
1430 length -= sg_dma_len(s);
1431
1432 for_each_sg(sg, s, remaining, i) {
1433 unsigned int num_trbs_left = dwc3_calc_trbs_left(dep);
1434 unsigned int trb_length;
1435 bool must_interrupt = false;
1436 bool last_sg = false;
1437
1438 trb_length = min_t(unsigned int, length, sg_dma_len(s));
1439
1440 length -= trb_length;
1441
1442 /*
1443 * IOMMU driver is coalescing the list of sgs which shares a
1444 * page boundary into one and giving it to USB driver. With
1445 * this the number of sgs mapped is not equal to the number of
1446 * sgs passed. So mark the chain bit to false if it isthe last
1447 * mapped sg.
1448 */
1449 if ((i == remaining - 1) || !length)
1450 last_sg = true;
1451
1452 if (!num_trbs_left)
1453 break;
1454
1455 if (last_sg) {
1456 if (!dwc3_prepare_last_sg(dep, req, trb_length, i))
1457 break;
1458 } else {
1459 /*
1460 * Look ahead to check if we have enough TRBs for the
1461 * next SG entry. If not, set interrupt on this TRB to
1462 * resume preparing the next SG entry when more TRBs are
1463 * free.
1464 */
1465 if (num_trbs_left == 1 || (needs_extra_trb &&
1466 num_trbs_left <= 2 &&
1467 sg_dma_len(sg_next(s)) >= length)) {
1468 struct dwc3_request *r;
1469
1470 /* Check if previous requests already set IOC */
1471 list_for_each_entry(r, &dep->started_list, list) {
1472 if (r != req && !r->request.no_interrupt)
1473 break;
1474
1475 if (r == req)
1476 must_interrupt = true;
1477 }
1478 }
1479
1480 dwc3_prepare_one_trb(dep, req, trb_length, 1, i, false,
1481 must_interrupt);
1482 }
1483
1484 /*
1485 * There can be a situation where all sgs in sglist are not
1486 * queued because of insufficient trb number. To handle this
1487 * case, update start_sg to next sg to be queued, so that
1488 * we have free trbs we can continue queuing from where we
1489 * previously stopped
1490 */
1491 if (!last_sg)
1492 req->start_sg = sg_next(s);
1493
1494 req->num_queued_sgs++;
1495 req->num_pending_sgs--;
1496
1497 /*
1498 * The number of pending SG entries may not correspond to the
1499 * number of mapped SG entries. If all the data are queued, then
1500 * don't include unused SG entries.
1501 */
1502 if (length == 0) {
1503 req->num_pending_sgs = 0;
1504 break;
1505 }
1506
1507 if (must_interrupt)
1508 break;
1509 }
1510
1511 return req->num_trbs - num_trbs;
1512}
1513
1514static int dwc3_prepare_trbs_linear(struct dwc3_ep *dep,
1515 struct dwc3_request *req)
1516{
1517 return dwc3_prepare_last_sg(dep, req, req->request.length, 0);
1518}
1519
1520/*
1521 * dwc3_prepare_trbs - setup TRBs from requests
1522 * @dep: endpoint for which requests are being prepared
1523 *
1524 * The function goes through the requests list and sets up TRBs for the
1525 * transfers. The function returns once there are no more TRBs available or
1526 * it runs out of requests.
1527 *
1528 * Returns the number of TRBs prepared or negative errno.
1529 */
1530static int dwc3_prepare_trbs(struct dwc3_ep *dep)
1531{
1532 struct dwc3_request *req, *n;
1533 int ret = 0;
1534
1535 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1536
1537 /*
1538 * We can get in a situation where there's a request in the started list
1539 * but there weren't enough TRBs to fully kick it in the first time
1540 * around, so it has been waiting for more TRBs to be freed up.
1541 *
1542 * In that case, we should check if we have a request with pending_sgs
1543 * in the started list and prepare TRBs for that request first,
1544 * otherwise we will prepare TRBs completely out of order and that will
1545 * break things.
1546 */
1547 list_for_each_entry(req, &dep->started_list, list) {
1548 if (req->num_pending_sgs > 0) {
1549 ret = dwc3_prepare_trbs_sg(dep, req);
1550 if (!ret || req->num_pending_sgs)
1551 return ret;
1552 }
1553
1554 if (!dwc3_calc_trbs_left(dep))
1555 return ret;
1556
1557 /*
1558 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
1559 * burst capability may try to read and use TRBs beyond the
1560 * active transfer instead of stopping.
1561 */
1562 if (dep->stream_capable && req->request.is_last &&
1563 !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
1564 return ret;
1565 }
1566
1567 list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1568 struct dwc3 *dwc = dep->dwc;
1569
1570 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1571 dep->direction);
1572 if (ret)
1573 return ret;
1574
1575 req->sg = req->request.sg;
1576 req->start_sg = req->sg;
1577 req->num_queued_sgs = 0;
1578 req->num_pending_sgs = req->request.num_mapped_sgs;
1579
1580 if (req->num_pending_sgs > 0) {
1581 ret = dwc3_prepare_trbs_sg(dep, req);
1582 if (req->num_pending_sgs)
1583 return ret;
1584 } else {
1585 ret = dwc3_prepare_trbs_linear(dep, req);
1586 }
1587
1588 if (!ret || !dwc3_calc_trbs_left(dep))
1589 return ret;
1590
1591 /*
1592 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
1593 * burst capability may try to read and use TRBs beyond the
1594 * active transfer instead of stopping.
1595 */
1596 if (dep->stream_capable && req->request.is_last &&
1597 !DWC3_MST_CAPABLE(&dwc->hwparams))
1598 return ret;
1599 }
1600
1601 return ret;
1602}
1603
1604static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep);
1605
1606static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
1607{
1608 struct dwc3_gadget_ep_cmd_params params;
1609 struct dwc3_request *req;
1610 int starting;
1611 int ret;
1612 u32 cmd;
1613
1614 /*
1615 * Note that it's normal to have no new TRBs prepared (i.e. ret == 0).
1616 * This happens when we need to stop and restart a transfer such as in
1617 * the case of reinitiating a stream or retrying an isoc transfer.
1618 */
1619 ret = dwc3_prepare_trbs(dep);
1620 if (ret < 0)
1621 return ret;
1622
1623 starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
1624
1625 /*
1626 * If there's no new TRB prepared and we don't need to restart a
1627 * transfer, there's no need to update the transfer.
1628 */
1629 if (!ret && !starting)
1630 return ret;
1631
1632 req = next_request(&dep->started_list);
1633 if (!req) {
1634 dep->flags |= DWC3_EP_PENDING_REQUEST;
1635 return 0;
1636 }
1637
1638 memset(¶ms, 0, sizeof(params));
1639
1640 if (starting) {
1641 params.param0 = upper_32_bits(req->trb_dma);
1642 params.param1 = lower_32_bits(req->trb_dma);
1643 cmd = DWC3_DEPCMD_STARTTRANSFER;
1644
1645 if (dep->stream_capable)
1646 cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id);
1647
1648 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
1649 cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
1650 } else {
1651 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1652 DWC3_DEPCMD_PARAM(dep->resource_index);
1653 }
1654
1655 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1656 if (ret < 0) {
1657 struct dwc3_request *tmp;
1658
1659 if (ret == -EAGAIN)
1660 return ret;
1661
1662 dwc3_stop_active_transfer(dep, true, true);
1663
1664 list_for_each_entry_safe(req, tmp, &dep->started_list, list)
1665 dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_DEQUEUED);
1666
1667 /* If ep isn't started, then there's no end transfer pending */
1668 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
1669 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
1670
1671 return ret;
1672 }
1673
1674 if (dep->stream_capable && req->request.is_last &&
1675 !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
1676 dep->flags |= DWC3_EP_WAIT_TRANSFER_COMPLETE;
1677
1678 return 0;
1679}
1680
1681static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1682{
1683 u32 reg;
1684
1685 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1686 return DWC3_DSTS_SOFFN(reg);
1687}
1688
1689/**
1690 * __dwc3_stop_active_transfer - stop the current active transfer
1691 * @dep: isoc endpoint
1692 * @force: set forcerm bit in the command
1693 * @interrupt: command complete interrupt after End Transfer command
1694 *
1695 * When setting force, the ForceRM bit will be set. In that case
1696 * the controller won't update the TRB progress on command
1697 * completion. It also won't clear the HWO bit in the TRB.
1698 * The command will also not complete immediately in that case.
1699 */
1700static int __dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt)
1701{
1702 struct dwc3_gadget_ep_cmd_params params;
1703 u32 cmd;
1704 int ret;
1705
1706 cmd = DWC3_DEPCMD_ENDTRANSFER;
1707 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
1708 cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0;
1709 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1710 memset(¶ms, 0, sizeof(params));
1711 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1712 /*
1713 * If the End Transfer command was timed out while the device is
1714 * not in SETUP phase, it's possible that an incoming Setup packet
1715 * may prevent the command's completion. Let's retry when the
1716 * ep0state returns to EP0_SETUP_PHASE.
1717 */
1718 if (ret == -ETIMEDOUT && dep->dwc->ep0state != EP0_SETUP_PHASE) {
1719 dep->flags |= DWC3_EP_DELAY_STOP;
1720 return 0;
1721 }
1722 WARN_ON_ONCE(ret);
1723 dep->resource_index = 0;
1724
1725 if (!interrupt) {
1726 mdelay(1);
1727 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
1728 } else if (!ret) {
1729 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
1730 }
1731
1732 dep->flags &= ~DWC3_EP_DELAY_STOP;
1733 return ret;
1734}
1735
1736/**
1737 * dwc3_gadget_start_isoc_quirk - workaround invalid frame number
1738 * @dep: isoc endpoint
1739 *
1740 * This function tests for the correct combination of BIT[15:14] from the 16-bit
1741 * microframe number reported by the XferNotReady event for the future frame
1742 * number to start the isoc transfer.
1743 *
1744 * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
1745 * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the
1746 * XferNotReady event are invalid. The driver uses this number to schedule the
1747 * isochronous transfer and passes it to the START TRANSFER command. Because
1748 * this number is invalid, the command may fail. If BIT[15:14] matches the
1749 * internal 16-bit microframe, the START TRANSFER command will pass and the
1750 * transfer will start at the scheduled time, if it is off by 1, the command
1751 * will still pass, but the transfer will start 2 seconds in the future. For all
1752 * other conditions, the START TRANSFER command will fail with bus-expiry.
1753 *
1754 * In order to workaround this issue, we can test for the correct combination of
1755 * BIT[15:14] by sending START TRANSFER commands with different values of
1756 * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart
1757 * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status.
1758 * As the result, within the 4 possible combinations for BIT[15:14], there will
1759 * be 2 successful and 2 failure START COMMAND status. One of the 2 successful
1760 * command status will result in a 2-second delay start. The smaller BIT[15:14]
1761 * value is the correct combination.
1762 *
1763 * Since there are only 4 outcomes and the results are ordered, we can simply
1764 * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to
1765 * deduce the smaller successful combination.
1766 *
1767 * Let test0 = test status for combination 'b00 and test1 = test status for 'b01
1768 * of BIT[15:14]. The correct combination is as follow:
1769 *
1770 * if test0 fails and test1 passes, BIT[15:14] is 'b01
1771 * if test0 fails and test1 fails, BIT[15:14] is 'b10
1772 * if test0 passes and test1 fails, BIT[15:14] is 'b11
1773 * if test0 passes and test1 passes, BIT[15:14] is 'b00
1774 *
1775 * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
1776 * endpoints.
1777 */
1778static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
1779{
1780 int cmd_status = 0;
1781 bool test0;
1782 bool test1;
1783
1784 while (dep->combo_num < 2) {
1785 struct dwc3_gadget_ep_cmd_params params;
1786 u32 test_frame_number;
1787 u32 cmd;
1788
1789 /*
1790 * Check if we can start isoc transfer on the next interval or
1791 * 4 uframes in the future with BIT[15:14] as dep->combo_num
1792 */
1793 test_frame_number = dep->frame_number & DWC3_FRNUMBER_MASK;
1794 test_frame_number |= dep->combo_num << 14;
1795 test_frame_number += max_t(u32, 4, dep->interval);
1796
1797 params.param0 = upper_32_bits(dep->dwc->bounce_addr);
1798 params.param1 = lower_32_bits(dep->dwc->bounce_addr);
1799
1800 cmd = DWC3_DEPCMD_STARTTRANSFER;
1801 cmd |= DWC3_DEPCMD_PARAM(test_frame_number);
1802 cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1803
1804 /* Redo if some other failure beside bus-expiry is received */
1805 if (cmd_status && cmd_status != -EAGAIN) {
1806 dep->start_cmd_status = 0;
1807 dep->combo_num = 0;
1808 return 0;
1809 }
1810
1811 /* Store the first test status */
1812 if (dep->combo_num == 0)
1813 dep->start_cmd_status = cmd_status;
1814
1815 dep->combo_num++;
1816
1817 /*
1818 * End the transfer if the START_TRANSFER command is successful
1819 * to wait for the next XferNotReady to test the command again
1820 */
1821 if (cmd_status == 0) {
1822 dwc3_stop_active_transfer(dep, true, true);
1823 return 0;
1824 }
1825 }
1826
1827 /* test0 and test1 are both completed at this point */
1828 test0 = (dep->start_cmd_status == 0);
1829 test1 = (cmd_status == 0);
1830
1831 if (!test0 && test1)
1832 dep->combo_num = 1;
1833 else if (!test0 && !test1)
1834 dep->combo_num = 2;
1835 else if (test0 && !test1)
1836 dep->combo_num = 3;
1837 else if (test0 && test1)
1838 dep->combo_num = 0;
1839
1840 dep->frame_number &= DWC3_FRNUMBER_MASK;
1841 dep->frame_number |= dep->combo_num << 14;
1842 dep->frame_number += max_t(u32, 4, dep->interval);
1843
1844 /* Reinitialize test variables */
1845 dep->start_cmd_status = 0;
1846 dep->combo_num = 0;
1847
1848 return __dwc3_gadget_kick_transfer(dep);
1849}
1850
1851static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
1852{
1853 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
1854 struct dwc3 *dwc = dep->dwc;
1855 int ret;
1856 int i;
1857
1858 if (list_empty(&dep->pending_list) &&
1859 list_empty(&dep->started_list)) {
1860 dep->flags |= DWC3_EP_PENDING_REQUEST;
1861 return -EAGAIN;
1862 }
1863
1864 if (!dwc->dis_start_transfer_quirk &&
1865 (DWC3_VER_IS_PRIOR(DWC31, 170A) ||
1866 DWC3_VER_TYPE_IS_WITHIN(DWC31, 170A, EA01, EA06))) {
1867 if (dwc->gadget->speed <= USB_SPEED_HIGH && dep->direction)
1868 return dwc3_gadget_start_isoc_quirk(dep);
1869 }
1870
1871 if (desc->bInterval <= 14 &&
1872 dwc->gadget->speed >= USB_SPEED_HIGH) {
1873 u32 frame = __dwc3_gadget_get_frame(dwc);
1874 bool rollover = frame <
1875 (dep->frame_number & DWC3_FRNUMBER_MASK);
1876
1877 /*
1878 * frame_number is set from XferNotReady and may be already
1879 * out of date. DSTS only provides the lower 14 bit of the
1880 * current frame number. So add the upper two bits of
1881 * frame_number and handle a possible rollover.
1882 * This will provide the correct frame_number unless more than
1883 * rollover has happened since XferNotReady.
1884 */
1885
1886 dep->frame_number = (dep->frame_number & ~DWC3_FRNUMBER_MASK) |
1887 frame;
1888 if (rollover)
1889 dep->frame_number += BIT(14);
1890 }
1891
1892 for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
1893 int future_interval = i + 1;
1894
1895 /* Give the controller at least 500us to schedule transfers */
1896 if (desc->bInterval < 3)
1897 future_interval += 3 - desc->bInterval;
1898
1899 dep->frame_number = DWC3_ALIGN_FRAME(dep, future_interval);
1900
1901 ret = __dwc3_gadget_kick_transfer(dep);
1902 if (ret != -EAGAIN)
1903 break;
1904 }
1905
1906 /*
1907 * After a number of unsuccessful start attempts due to bus-expiry
1908 * status, issue END_TRANSFER command and retry on the next XferNotReady
1909 * event.
1910 */
1911 if (ret == -EAGAIN)
1912 ret = __dwc3_stop_active_transfer(dep, false, true);
1913
1914 return ret;
1915}
1916
1917static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1918{
1919 struct dwc3 *dwc = dep->dwc;
1920
1921 if (!dep->endpoint.desc || !dwc->pullups_connected || !dwc->connected) {
1922 dev_dbg(dwc->dev, "%s: can't queue to disabled endpoint\n",
1923 dep->name);
1924 return -ESHUTDOWN;
1925 }
1926
1927 if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
1928 &req->request, req->dep->name))
1929 return -EINVAL;
1930
1931 if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
1932 "%s: request %pK already in flight\n",
1933 dep->name, &req->request))
1934 return -EINVAL;
1935
1936 pm_runtime_get(dwc->dev);
1937
1938 req->request.actual = 0;
1939 req->request.status = -EINPROGRESS;
1940
1941 trace_dwc3_ep_queue(req);
1942
1943 list_add_tail(&req->list, &dep->pending_list);
1944 req->status = DWC3_REQUEST_STATUS_QUEUED;
1945
1946 if (dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)
1947 return 0;
1948
1949 /*
1950 * Start the transfer only after the END_TRANSFER is completed
1951 * and endpoint STALL is cleared.
1952 */
1953 if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
1954 (dep->flags & DWC3_EP_WEDGE) ||
1955 (dep->flags & DWC3_EP_DELAY_STOP) ||
1956 (dep->flags & DWC3_EP_STALL)) {
1957 dep->flags |= DWC3_EP_DELAY_START;
1958 return 0;
1959 }
1960
1961 /*
1962 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1963 * wait for a XferNotReady event so we will know what's the current
1964 * (micro-)frame number.
1965 *
1966 * Without this trick, we are very, very likely gonna get Bus Expiry
1967 * errors which will force us issue EndTransfer command.
1968 */
1969 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1970 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
1971 if ((dep->flags & DWC3_EP_PENDING_REQUEST))
1972 return __dwc3_gadget_start_isoc(dep);
1973
1974 return 0;
1975 }
1976 }
1977
1978 __dwc3_gadget_kick_transfer(dep);
1979
1980 return 0;
1981}
1982
1983static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1984 gfp_t gfp_flags)
1985{
1986 struct dwc3_request *req = to_dwc3_request(request);
1987 struct dwc3_ep *dep = to_dwc3_ep(ep);
1988 struct dwc3 *dwc = dep->dwc;
1989
1990 unsigned long flags;
1991
1992 int ret;
1993
1994 spin_lock_irqsave(&dwc->lock, flags);
1995 ret = __dwc3_gadget_ep_queue(dep, req);
1996 spin_unlock_irqrestore(&dwc->lock, flags);
1997
1998 return ret;
1999}
2000
2001static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req)
2002{
2003 int i;
2004
2005 /* If req->trb is not set, then the request has not started */
2006 if (!req->trb)
2007 return;
2008
2009 /*
2010 * If request was already started, this means we had to
2011 * stop the transfer. With that we also need to ignore
2012 * all TRBs used by the request, however TRBs can only
2013 * be modified after completion of END_TRANSFER
2014 * command. So what we do here is that we wait for
2015 * END_TRANSFER completion and only after that, we jump
2016 * over TRBs by clearing HWO and incrementing dequeue
2017 * pointer.
2018 */
2019 for (i = 0; i < req->num_trbs; i++) {
2020 struct dwc3_trb *trb;
2021
2022 trb = &dep->trb_pool[dep->trb_dequeue];
2023 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2024 dwc3_ep_inc_deq(dep);
2025 }
2026
2027 req->num_trbs = 0;
2028}
2029
2030static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
2031{
2032 struct dwc3_request *req;
2033 struct dwc3 *dwc = dep->dwc;
2034
2035 while (!list_empty(&dep->cancelled_list)) {
2036 req = next_request(&dep->cancelled_list);
2037 dwc3_gadget_ep_skip_trbs(dep, req);
2038 switch (req->status) {
2039 case DWC3_REQUEST_STATUS_DISCONNECTED:
2040 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
2041 break;
2042 case DWC3_REQUEST_STATUS_DEQUEUED:
2043 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2044 break;
2045 case DWC3_REQUEST_STATUS_STALLED:
2046 dwc3_gadget_giveback(dep, req, -EPIPE);
2047 break;
2048 default:
2049 dev_err(dwc->dev, "request cancelled with wrong reason:%d\n", req->status);
2050 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2051 break;
2052 }
2053 /*
2054 * The endpoint is disabled, let the dwc3_remove_requests()
2055 * handle the cleanup.
2056 */
2057 if (!dep->endpoint.desc)
2058 break;
2059 }
2060}
2061
2062static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
2063 struct usb_request *request)
2064{
2065 struct dwc3_request *req = to_dwc3_request(request);
2066 struct dwc3_request *r = NULL;
2067
2068 struct dwc3_ep *dep = to_dwc3_ep(ep);
2069 struct dwc3 *dwc = dep->dwc;
2070
2071 unsigned long flags;
2072 int ret = 0;
2073
2074 trace_dwc3_ep_dequeue(req);
2075
2076 spin_lock_irqsave(&dwc->lock, flags);
2077
2078 list_for_each_entry(r, &dep->cancelled_list, list) {
2079 if (r == req)
2080 goto out;
2081 }
2082
2083 list_for_each_entry(r, &dep->pending_list, list) {
2084 if (r == req) {
2085 /*
2086 * Explicitly check for EP0/1 as dequeue for those
2087 * EPs need to be handled differently. Control EP
2088 * only deals with one USB req, and giveback will
2089 * occur during dwc3_ep0_stall_and_restart(). EP0
2090 * requests are never added to started_list.
2091 */
2092 if (dep->number > 1)
2093 dwc3_gadget_giveback(dep, req, -ECONNRESET);
2094 else
2095 dwc3_ep0_reset_state(dwc);
2096 goto out;
2097 }
2098 }
2099
2100 list_for_each_entry(r, &dep->started_list, list) {
2101 if (r == req) {
2102 struct dwc3_request *t;
2103
2104 /* wait until it is processed */
2105 dwc3_stop_active_transfer(dep, true, true);
2106
2107 /*
2108 * Remove any started request if the transfer is
2109 * cancelled.
2110 */
2111 list_for_each_entry_safe(r, t, &dep->started_list, list)
2112 dwc3_gadget_move_cancelled_request(r,
2113 DWC3_REQUEST_STATUS_DEQUEUED);
2114
2115 dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
2116
2117 goto out;
2118 }
2119 }
2120
2121 dev_err(dwc->dev, "request %pK was not queued to %s\n",
2122 request, ep->name);
2123 ret = -EINVAL;
2124out:
2125 spin_unlock_irqrestore(&dwc->lock, flags);
2126
2127 return ret;
2128}
2129
2130int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
2131{
2132 struct dwc3_gadget_ep_cmd_params params;
2133 struct dwc3 *dwc = dep->dwc;
2134 struct dwc3_request *req;
2135 struct dwc3_request *tmp;
2136 int ret;
2137
2138 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2139 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
2140 return -EINVAL;
2141 }
2142
2143 memset(¶ms, 0x00, sizeof(params));
2144
2145 if (value) {
2146 struct dwc3_trb *trb;
2147
2148 unsigned int transfer_in_flight;
2149 unsigned int started;
2150
2151 if (dep->number > 1)
2152 trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
2153 else
2154 trb = &dwc->ep0_trb[dep->trb_enqueue];
2155
2156 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
2157 started = !list_empty(&dep->started_list);
2158
2159 if (!protocol && ((dep->direction && transfer_in_flight) ||
2160 (!dep->direction && started))) {
2161 return -EAGAIN;
2162 }
2163
2164 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
2165 ¶ms);
2166 if (ret)
2167 dev_err(dwc->dev, "failed to set STALL on %s\n",
2168 dep->name);
2169 else
2170 dep->flags |= DWC3_EP_STALL;
2171 } else {
2172 /*
2173 * Don't issue CLEAR_STALL command to control endpoints. The
2174 * controller automatically clears the STALL when it receives
2175 * the SETUP token.
2176 */
2177 if (dep->number <= 1) {
2178 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
2179 return 0;
2180 }
2181
2182 dwc3_stop_active_transfer(dep, true, true);
2183
2184 list_for_each_entry_safe(req, tmp, &dep->started_list, list)
2185 dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_STALLED);
2186
2187 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING ||
2188 (dep->flags & DWC3_EP_DELAY_STOP)) {
2189 dep->flags |= DWC3_EP_PENDING_CLEAR_STALL;
2190 if (protocol)
2191 dwc->clear_stall_protocol = dep->number;
2192
2193 return 0;
2194 }
2195
2196 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
2197
2198 ret = dwc3_send_clear_stall_ep_cmd(dep);
2199 if (ret) {
2200 dev_err(dwc->dev, "failed to clear STALL on %s\n",
2201 dep->name);
2202 return ret;
2203 }
2204
2205 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
2206
2207 if ((dep->flags & DWC3_EP_DELAY_START) &&
2208 !usb_endpoint_xfer_isoc(dep->endpoint.desc))
2209 __dwc3_gadget_kick_transfer(dep);
2210
2211 dep->flags &= ~DWC3_EP_DELAY_START;
2212 }
2213
2214 return ret;
2215}
2216
2217static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
2218{
2219 struct dwc3_ep *dep = to_dwc3_ep(ep);
2220 struct dwc3 *dwc = dep->dwc;
2221
2222 unsigned long flags;
2223
2224 int ret;
2225
2226 spin_lock_irqsave(&dwc->lock, flags);
2227 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
2228 spin_unlock_irqrestore(&dwc->lock, flags);
2229
2230 return ret;
2231}
2232
2233static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
2234{
2235 struct dwc3_ep *dep = to_dwc3_ep(ep);
2236 struct dwc3 *dwc = dep->dwc;
2237 unsigned long flags;
2238 int ret;
2239
2240 spin_lock_irqsave(&dwc->lock, flags);
2241 dep->flags |= DWC3_EP_WEDGE;
2242
2243 if (dep->number == 0 || dep->number == 1)
2244 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
2245 else
2246 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
2247 spin_unlock_irqrestore(&dwc->lock, flags);
2248
2249 return ret;
2250}
2251
2252/* -------------------------------------------------------------------------- */
2253
2254static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
2255 .bLength = USB_DT_ENDPOINT_SIZE,
2256 .bDescriptorType = USB_DT_ENDPOINT,
2257 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
2258};
2259
2260static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
2261 .enable = dwc3_gadget_ep0_enable,
2262 .disable = dwc3_gadget_ep0_disable,
2263 .alloc_request = dwc3_gadget_ep_alloc_request,
2264 .free_request = dwc3_gadget_ep_free_request,
2265 .queue = dwc3_gadget_ep0_queue,
2266 .dequeue = dwc3_gadget_ep_dequeue,
2267 .set_halt = dwc3_gadget_ep0_set_halt,
2268 .set_wedge = dwc3_gadget_ep_set_wedge,
2269};
2270
2271static const struct usb_ep_ops dwc3_gadget_ep_ops = {
2272 .enable = dwc3_gadget_ep_enable,
2273 .disable = dwc3_gadget_ep_disable,
2274 .alloc_request = dwc3_gadget_ep_alloc_request,
2275 .free_request = dwc3_gadget_ep_free_request,
2276 .queue = dwc3_gadget_ep_queue,
2277 .dequeue = dwc3_gadget_ep_dequeue,
2278 .set_halt = dwc3_gadget_ep_set_halt,
2279 .set_wedge = dwc3_gadget_ep_set_wedge,
2280};
2281
2282/* -------------------------------------------------------------------------- */
2283
2284static void dwc3_gadget_enable_linksts_evts(struct dwc3 *dwc, bool set)
2285{
2286 u32 reg;
2287
2288 if (DWC3_VER_IS_PRIOR(DWC3, 250A))
2289 return;
2290
2291 reg = dwc3_readl(dwc->regs, DWC3_DEVTEN);
2292 if (set)
2293 reg |= DWC3_DEVTEN_ULSTCNGEN;
2294 else
2295 reg &= ~DWC3_DEVTEN_ULSTCNGEN;
2296
2297 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2298}
2299
2300static int dwc3_gadget_get_frame(struct usb_gadget *g)
2301{
2302 struct dwc3 *dwc = gadget_to_dwc(g);
2303
2304 return __dwc3_gadget_get_frame(dwc);
2305}
2306
2307static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async)
2308{
2309 int retries;
2310
2311 int ret;
2312 u32 reg;
2313
2314 u8 link_state;
2315
2316 /*
2317 * According to the Databook Remote wakeup request should
2318 * be issued only when the device is in early suspend state.
2319 *
2320 * We can check that via USB Link State bits in DSTS register.
2321 */
2322 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2323
2324 link_state = DWC3_DSTS_USBLNKST(reg);
2325
2326 switch (link_state) {
2327 case DWC3_LINK_STATE_RESET:
2328 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
2329 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
2330 case DWC3_LINK_STATE_U2: /* in HS, means Sleep (L1) */
2331 case DWC3_LINK_STATE_U1:
2332 case DWC3_LINK_STATE_RESUME:
2333 break;
2334 default:
2335 return -EINVAL;
2336 }
2337
2338 if (async)
2339 dwc3_gadget_enable_linksts_evts(dwc, true);
2340
2341 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
2342 if (ret < 0) {
2343 dev_err(dwc->dev, "failed to put link in Recovery\n");
2344 dwc3_gadget_enable_linksts_evts(dwc, false);
2345 return ret;
2346 }
2347
2348 /* Recent versions do this automatically */
2349 if (DWC3_VER_IS_PRIOR(DWC3, 194A)) {
2350 /* write zeroes to Link Change Request */
2351 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2352 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
2353 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2354 }
2355
2356 /*
2357 * Since link status change events are enabled we will receive
2358 * an U0 event when wakeup is successful. So bail out.
2359 */
2360 if (async)
2361 return 0;
2362
2363 /* poll until Link State changes to ON */
2364 retries = 20000;
2365
2366 while (retries--) {
2367 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2368
2369 /* in HS, means ON */
2370 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
2371 break;
2372 }
2373
2374 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
2375 dev_err(dwc->dev, "failed to send remote wakeup\n");
2376 return -EINVAL;
2377 }
2378
2379 return 0;
2380}
2381
2382static int dwc3_gadget_wakeup(struct usb_gadget *g)
2383{
2384 struct dwc3 *dwc = gadget_to_dwc(g);
2385 unsigned long flags;
2386 int ret;
2387
2388 if (!dwc->wakeup_configured) {
2389 dev_err(dwc->dev, "remote wakeup not configured\n");
2390 return -EINVAL;
2391 }
2392
2393 spin_lock_irqsave(&dwc->lock, flags);
2394 if (!dwc->gadget->wakeup_armed) {
2395 dev_err(dwc->dev, "not armed for remote wakeup\n");
2396 spin_unlock_irqrestore(&dwc->lock, flags);
2397 return -EINVAL;
2398 }
2399 ret = __dwc3_gadget_wakeup(dwc, true);
2400
2401 spin_unlock_irqrestore(&dwc->lock, flags);
2402
2403 return ret;
2404}
2405
2406static void dwc3_resume_gadget(struct dwc3 *dwc);
2407
2408static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
2409{
2410 struct dwc3 *dwc = gadget_to_dwc(g);
2411 unsigned long flags;
2412 int ret;
2413 int link_state;
2414
2415 if (!dwc->wakeup_configured) {
2416 dev_err(dwc->dev, "remote wakeup not configured\n");
2417 return -EINVAL;
2418 }
2419
2420 spin_lock_irqsave(&dwc->lock, flags);
2421 /*
2422 * If the link is in U3, signal for remote wakeup and wait for the
2423 * link to transition to U0 before sending device notification.
2424 */
2425 link_state = dwc3_gadget_get_link_state(dwc);
2426 if (link_state == DWC3_LINK_STATE_U3) {
2427 ret = __dwc3_gadget_wakeup(dwc, false);
2428 if (ret) {
2429 spin_unlock_irqrestore(&dwc->lock, flags);
2430 return -EINVAL;
2431 }
2432 dwc3_resume_gadget(dwc);
2433 dwc->suspended = false;
2434 dwc->link_state = DWC3_LINK_STATE_U0;
2435 }
2436
2437 ret = dwc3_send_gadget_generic_command(dwc, DWC3_DGCMD_DEV_NOTIFICATION,
2438 DWC3_DGCMDPAR_DN_FUNC_WAKE |
2439 DWC3_DGCMDPAR_INTF_SEL(intf_id));
2440 if (ret)
2441 dev_err(dwc->dev, "function remote wakeup failed, ret:%d\n", ret);
2442
2443 spin_unlock_irqrestore(&dwc->lock, flags);
2444
2445 return ret;
2446}
2447
2448static int dwc3_gadget_set_remote_wakeup(struct usb_gadget *g, int set)
2449{
2450 struct dwc3 *dwc = gadget_to_dwc(g);
2451 unsigned long flags;
2452
2453 spin_lock_irqsave(&dwc->lock, flags);
2454 dwc->wakeup_configured = !!set;
2455 spin_unlock_irqrestore(&dwc->lock, flags);
2456
2457 return 0;
2458}
2459
2460static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
2461 int is_selfpowered)
2462{
2463 struct dwc3 *dwc = gadget_to_dwc(g);
2464 unsigned long flags;
2465
2466 spin_lock_irqsave(&dwc->lock, flags);
2467 g->is_selfpowered = !!is_selfpowered;
2468 spin_unlock_irqrestore(&dwc->lock, flags);
2469
2470 return 0;
2471}
2472
2473static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2474{
2475 u32 epnum;
2476
2477 for (epnum = 2; epnum < dwc->num_eps; epnum++) {
2478 struct dwc3_ep *dep;
2479
2480 dep = dwc->eps[epnum];
2481 if (!dep)
2482 continue;
2483
2484 dwc3_remove_requests(dwc, dep, -ESHUTDOWN);
2485 }
2486}
2487
2488static void __dwc3_gadget_set_ssp_rate(struct dwc3 *dwc)
2489{
2490 enum usb_ssp_rate ssp_rate = dwc->gadget_ssp_rate;
2491 u32 reg;
2492
2493 if (ssp_rate == USB_SSP_GEN_UNKNOWN)
2494 ssp_rate = dwc->max_ssp_rate;
2495
2496 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2497 reg &= ~DWC3_DCFG_SPEED_MASK;
2498 reg &= ~DWC3_DCFG_NUMLANES(~0);
2499
2500 if (ssp_rate == USB_SSP_GEN_1x2)
2501 reg |= DWC3_DCFG_SUPERSPEED;
2502 else if (dwc->max_ssp_rate != USB_SSP_GEN_1x2)
2503 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2504
2505 if (ssp_rate != USB_SSP_GEN_2x1 &&
2506 dwc->max_ssp_rate != USB_SSP_GEN_2x1)
2507 reg |= DWC3_DCFG_NUMLANES(1);
2508
2509 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2510}
2511
2512static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
2513{
2514 enum usb_device_speed speed;
2515 u32 reg;
2516
2517 speed = dwc->gadget_max_speed;
2518 if (speed == USB_SPEED_UNKNOWN || speed > dwc->maximum_speed)
2519 speed = dwc->maximum_speed;
2520
2521 if (speed == USB_SPEED_SUPER_PLUS &&
2522 DWC3_IP_IS(DWC32)) {
2523 __dwc3_gadget_set_ssp_rate(dwc);
2524 return;
2525 }
2526
2527 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2528 reg &= ~(DWC3_DCFG_SPEED_MASK);
2529
2530 /*
2531 * WORKAROUND: DWC3 revision < 2.20a have an issue
2532 * which would cause metastability state on Run/Stop
2533 * bit if we try to force the IP to USB2-only mode.
2534 *
2535 * Because of that, we cannot configure the IP to any
2536 * speed other than the SuperSpeed
2537 *
2538 * Refers to:
2539 *
2540 * STAR#9000525659: Clock Domain Crossing on DCTL in
2541 * USB 2.0 Mode
2542 */
2543 if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
2544 !dwc->dis_metastability_quirk) {
2545 reg |= DWC3_DCFG_SUPERSPEED;
2546 } else {
2547 switch (speed) {
2548 case USB_SPEED_FULL:
2549 reg |= DWC3_DCFG_FULLSPEED;
2550 break;
2551 case USB_SPEED_HIGH:
2552 reg |= DWC3_DCFG_HIGHSPEED;
2553 break;
2554 case USB_SPEED_SUPER:
2555 reg |= DWC3_DCFG_SUPERSPEED;
2556 break;
2557 case USB_SPEED_SUPER_PLUS:
2558 if (DWC3_IP_IS(DWC3))
2559 reg |= DWC3_DCFG_SUPERSPEED;
2560 else
2561 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2562 break;
2563 default:
2564 dev_err(dwc->dev, "invalid speed (%d)\n", speed);
2565
2566 if (DWC3_IP_IS(DWC3))
2567 reg |= DWC3_DCFG_SUPERSPEED;
2568 else
2569 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2570 }
2571 }
2572
2573 if (DWC3_IP_IS(DWC32) &&
2574 speed > USB_SPEED_UNKNOWN &&
2575 speed < USB_SPEED_SUPER_PLUS)
2576 reg &= ~DWC3_DCFG_NUMLANES(~0);
2577
2578 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2579}
2580
2581static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
2582{
2583 u32 reg;
2584 u32 timeout = 2000;
2585
2586 if (pm_runtime_suspended(dwc->dev))
2587 return 0;
2588
2589 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2590 if (is_on) {
2591 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 187A)) {
2592 reg &= ~DWC3_DCTL_TRGTULST_MASK;
2593 reg |= DWC3_DCTL_TRGTULST_RX_DET;
2594 }
2595
2596 if (!DWC3_VER_IS_PRIOR(DWC3, 194A))
2597 reg &= ~DWC3_DCTL_KEEP_CONNECT;
2598 reg |= DWC3_DCTL_RUN_STOP;
2599
2600 __dwc3_gadget_set_speed(dwc);
2601 dwc->pullups_connected = true;
2602 } else {
2603 reg &= ~DWC3_DCTL_RUN_STOP;
2604
2605 dwc->pullups_connected = false;
2606 }
2607
2608 dwc3_gadget_dctl_write_safe(dwc, reg);
2609
2610 do {
2611 usleep_range(1000, 2000);
2612 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2613 reg &= DWC3_DSTS_DEVCTRLHLT;
2614 } while (--timeout && !(!is_on ^ !reg));
2615
2616 if (!timeout)
2617 return -ETIMEDOUT;
2618
2619 return 0;
2620}
2621
2622static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
2623static void __dwc3_gadget_stop(struct dwc3 *dwc);
2624static int __dwc3_gadget_start(struct dwc3 *dwc);
2625
2626static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc)
2627{
2628 unsigned long flags;
2629 int ret;
2630
2631 spin_lock_irqsave(&dwc->lock, flags);
2632 if (!dwc->pullups_connected) {
2633 spin_unlock_irqrestore(&dwc->lock, flags);
2634 return 0;
2635 }
2636
2637 dwc->connected = false;
2638
2639 /*
2640 * Attempt to end pending SETUP status phase, and not wait for the
2641 * function to do so.
2642 */
2643 if (dwc->delayed_status)
2644 dwc3_ep0_send_delayed_status(dwc);
2645
2646 /*
2647 * In the Synopsys DesignWare Cores USB3 Databook Rev. 3.30a
2648 * Section 4.1.8 Table 4-7, it states that for a device-initiated
2649 * disconnect, the SW needs to ensure that it sends "a DEPENDXFER
2650 * command for any active transfers" before clearing the RunStop
2651 * bit.
2652 */
2653 dwc3_stop_active_transfers(dwc);
2654 spin_unlock_irqrestore(&dwc->lock, flags);
2655
2656 /*
2657 * Per databook, when we want to stop the gadget, if a control transfer
2658 * is still in process, complete it and get the core into setup phase.
2659 * In case the host is unresponsive to a SETUP transaction, forcefully
2660 * stall the transfer, and move back to the SETUP phase, so that any
2661 * pending endxfers can be executed.
2662 */
2663 if (dwc->ep0state != EP0_SETUP_PHASE) {
2664 reinit_completion(&dwc->ep0_in_setup);
2665
2666 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
2667 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
2668 if (ret == 0) {
2669 dev_warn(dwc->dev, "wait for SETUP phase timed out\n");
2670 spin_lock_irqsave(&dwc->lock, flags);
2671 dwc3_ep0_reset_state(dwc);
2672 spin_unlock_irqrestore(&dwc->lock, flags);
2673 }
2674 }
2675
2676 /*
2677 * Note: if the GEVNTCOUNT indicates events in the event buffer, the
2678 * driver needs to acknowledge them before the controller can halt.
2679 * Simply let the interrupt handler acknowledges and handle the
2680 * remaining event generated by the controller while polling for
2681 * DSTS.DEVCTLHLT.
2682 */
2683 ret = dwc3_gadget_run_stop(dwc, false);
2684
2685 /*
2686 * Stop the gadget after controller is halted, so that if needed, the
2687 * events to update EP0 state can still occur while the run/stop
2688 * routine polls for the halted state. DEVTEN is cleared as part of
2689 * gadget stop.
2690 */
2691 spin_lock_irqsave(&dwc->lock, flags);
2692 __dwc3_gadget_stop(dwc);
2693 spin_unlock_irqrestore(&dwc->lock, flags);
2694
2695 return ret;
2696}
2697
2698static int dwc3_gadget_soft_connect(struct dwc3 *dwc)
2699{
2700 int ret;
2701
2702 /*
2703 * In the Synopsys DWC_usb31 1.90a programming guide section
2704 * 4.1.9, it specifies that for a reconnect after a
2705 * device-initiated disconnect requires a core soft reset
2706 * (DCTL.CSftRst) before enabling the run/stop bit.
2707 */
2708 ret = dwc3_core_soft_reset(dwc);
2709 if (ret)
2710 return ret;
2711
2712 dwc3_event_buffers_setup(dwc);
2713 __dwc3_gadget_start(dwc);
2714 return dwc3_gadget_run_stop(dwc, true);
2715}
2716
2717static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
2718{
2719 struct dwc3 *dwc = gadget_to_dwc(g);
2720 int ret;
2721
2722 is_on = !!is_on;
2723
2724 dwc->softconnect = is_on;
2725
2726 /*
2727 * Avoid issuing a runtime resume if the device is already in the
2728 * suspended state during gadget disconnect. DWC3 gadget was already
2729 * halted/stopped during runtime suspend.
2730 */
2731 if (!is_on) {
2732 pm_runtime_barrier(dwc->dev);
2733 if (pm_runtime_suspended(dwc->dev))
2734 return 0;
2735 }
2736
2737 /*
2738 * Check the return value for successful resume, or error. For a
2739 * successful resume, the DWC3 runtime PM resume routine will handle
2740 * the run stop sequence, so avoid duplicate operations here.
2741 */
2742 ret = pm_runtime_get_sync(dwc->dev);
2743 if (!ret || ret < 0) {
2744 pm_runtime_put(dwc->dev);
2745 if (ret < 0)
2746 pm_runtime_set_suspended(dwc->dev);
2747 return ret;
2748 }
2749
2750 if (dwc->pullups_connected == is_on) {
2751 pm_runtime_put(dwc->dev);
2752 return 0;
2753 }
2754
2755 synchronize_irq(dwc->irq_gadget);
2756
2757 if (!is_on)
2758 ret = dwc3_gadget_soft_disconnect(dwc);
2759 else
2760 ret = dwc3_gadget_soft_connect(dwc);
2761
2762 pm_runtime_put(dwc->dev);
2763
2764 return ret;
2765}
2766
2767static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
2768{
2769 u32 reg;
2770
2771 /* Enable all but Start and End of Frame IRQs */
2772 reg = (DWC3_DEVTEN_EVNTOVERFLOWEN |
2773 DWC3_DEVTEN_CMDCMPLTEN |
2774 DWC3_DEVTEN_ERRTICERREN |
2775 DWC3_DEVTEN_WKUPEVTEN |
2776 DWC3_DEVTEN_CONNECTDONEEN |
2777 DWC3_DEVTEN_USBRSTEN |
2778 DWC3_DEVTEN_DISCONNEVTEN);
2779
2780 if (DWC3_VER_IS_PRIOR(DWC3, 250A))
2781 reg |= DWC3_DEVTEN_ULSTCNGEN;
2782
2783 /* On 2.30a and above this bit enables U3/L2-L1 Suspend Events */
2784 if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
2785 reg |= DWC3_DEVTEN_U3L2L1SUSPEN;
2786
2787 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2788}
2789
2790static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
2791{
2792 /* mask all interrupts */
2793 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2794}
2795
2796static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
2797static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
2798
2799/**
2800 * dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
2801 * @dwc: pointer to our context structure
2802 *
2803 * The following looks like complex but it's actually very simple. In order to
2804 * calculate the number of packets we can burst at once on OUT transfers, we're
2805 * gonna use RxFIFO size.
2806 *
2807 * To calculate RxFIFO size we need two numbers:
2808 * MDWIDTH = size, in bits, of the internal memory bus
2809 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
2810 *
2811 * Given these two numbers, the formula is simple:
2812 *
2813 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
2814 *
2815 * 24 bytes is for 3x SETUP packets
2816 * 16 bytes is a clock domain crossing tolerance
2817 *
2818 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
2819 */
2820static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
2821{
2822 u32 ram2_depth;
2823 u32 mdwidth;
2824 u32 nump;
2825 u32 reg;
2826
2827 ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
2828 mdwidth = dwc3_mdwidth(dwc);
2829
2830 nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
2831 nump = min_t(u32, nump, 16);
2832
2833 /* update NumP */
2834 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2835 reg &= ~DWC3_DCFG_NUMP_MASK;
2836 reg |= nump << DWC3_DCFG_NUMP_SHIFT;
2837 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2838}
2839
2840static int __dwc3_gadget_start(struct dwc3 *dwc)
2841{
2842 struct dwc3_ep *dep;
2843 int ret = 0;
2844 u32 reg;
2845
2846 /*
2847 * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
2848 * the core supports IMOD, disable it.
2849 */
2850 if (dwc->imod_interval) {
2851 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
2852 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
2853 } else if (dwc3_has_imod(dwc)) {
2854 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
2855 }
2856
2857 /*
2858 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
2859 * field instead of letting dwc3 itself calculate that automatically.
2860 *
2861 * This way, we maximize the chances that we'll be able to get several
2862 * bursts of data without going through any sort of endpoint throttling.
2863 */
2864 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
2865 if (DWC3_IP_IS(DWC3))
2866 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
2867 else
2868 reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;
2869
2870 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
2871
2872 dwc3_gadget_setup_nump(dwc);
2873
2874 /*
2875 * Currently the controller handles single stream only. So, Ignore
2876 * Packet Pending bit for stream selection and don't search for another
2877 * stream if the host sends Data Packet with PP=0 (for OUT direction) or
2878 * ACK with NumP=0 and PP=0 (for IN direction). This slightly improves
2879 * the stream performance.
2880 */
2881 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2882 reg |= DWC3_DCFG_IGNSTRMPP;
2883 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2884
2885 /* Enable MST by default if the device is capable of MST */
2886 if (DWC3_MST_CAPABLE(&dwc->hwparams)) {
2887 reg = dwc3_readl(dwc->regs, DWC3_DCFG1);
2888 reg &= ~DWC3_DCFG1_DIS_MST_ENH;
2889 dwc3_writel(dwc->regs, DWC3_DCFG1, reg);
2890 }
2891
2892 /* Start with SuperSpeed Default */
2893 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2894
2895 ret = dwc3_gadget_start_config(dwc, 0);
2896 if (ret) {
2897 dev_err(dwc->dev, "failed to config endpoints\n");
2898 return ret;
2899 }
2900
2901 dep = dwc->eps[0];
2902 dep->flags = 0;
2903 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
2904 if (ret) {
2905 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2906 goto err0;
2907 }
2908
2909 dep = dwc->eps[1];
2910 dep->flags = 0;
2911 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
2912 if (ret) {
2913 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2914 goto err1;
2915 }
2916
2917 /* begin to receive SETUP packets */
2918 dwc->ep0state = EP0_SETUP_PHASE;
2919 dwc->ep0_bounced = false;
2920 dwc->link_state = DWC3_LINK_STATE_SS_DIS;
2921 dwc->delayed_status = false;
2922 dwc3_ep0_out_start(dwc);
2923
2924 dwc3_gadget_enable_irq(dwc);
2925 dwc3_enable_susphy(dwc, true);
2926
2927 return 0;
2928
2929err1:
2930 __dwc3_gadget_ep_disable(dwc->eps[0]);
2931
2932err0:
2933 return ret;
2934}
2935
2936static int dwc3_gadget_start(struct usb_gadget *g,
2937 struct usb_gadget_driver *driver)
2938{
2939 struct dwc3 *dwc = gadget_to_dwc(g);
2940 unsigned long flags;
2941 int ret;
2942 int irq;
2943
2944 irq = dwc->irq_gadget;
2945 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
2946 IRQF_SHARED, "dwc3", dwc->ev_buf);
2947 if (ret) {
2948 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2949 irq, ret);
2950 return ret;
2951 }
2952
2953 spin_lock_irqsave(&dwc->lock, flags);
2954 dwc->gadget_driver = driver;
2955 spin_unlock_irqrestore(&dwc->lock, flags);
2956
2957 if (dwc->sys_wakeup)
2958 device_wakeup_enable(dwc->sysdev);
2959
2960 return 0;
2961}
2962
2963static void __dwc3_gadget_stop(struct dwc3 *dwc)
2964{
2965 dwc3_gadget_disable_irq(dwc);
2966 __dwc3_gadget_ep_disable(dwc->eps[0]);
2967 __dwc3_gadget_ep_disable(dwc->eps[1]);
2968}
2969
2970static int dwc3_gadget_stop(struct usb_gadget *g)
2971{
2972 struct dwc3 *dwc = gadget_to_dwc(g);
2973 unsigned long flags;
2974
2975 if (dwc->sys_wakeup)
2976 device_wakeup_disable(dwc->sysdev);
2977
2978 spin_lock_irqsave(&dwc->lock, flags);
2979 dwc->gadget_driver = NULL;
2980 dwc->max_cfg_eps = 0;
2981 spin_unlock_irqrestore(&dwc->lock, flags);
2982
2983 free_irq(dwc->irq_gadget, dwc->ev_buf);
2984
2985 return 0;
2986}
2987
2988static void dwc3_gadget_config_params(struct usb_gadget *g,
2989 struct usb_dcd_config_params *params)
2990{
2991 struct dwc3 *dwc = gadget_to_dwc(g);
2992
2993 params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
2994 params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;
2995
2996 /* Recommended BESL */
2997 if (!dwc->dis_enblslpm_quirk) {
2998 /*
2999 * If the recommended BESL baseline is 0 or if the BESL deep is
3000 * less than 2, Microsoft's Windows 10 host usb stack will issue
3001 * a usb reset immediately after it receives the extended BOS
3002 * descriptor and the enumeration will fail. To maintain
3003 * compatibility with the Windows' usb stack, let's set the
3004 * recommended BESL baseline to 1 and clamp the BESL deep to be
3005 * within 2 to 15.
3006 */
3007 params->besl_baseline = 1;
3008 if (dwc->is_utmi_l1_suspend)
3009 params->besl_deep =
3010 clamp_t(u8, dwc->hird_threshold, 2, 15);
3011 }
3012
3013 /* U1 Device exit Latency */
3014 if (dwc->dis_u1_entry_quirk)
3015 params->bU1devExitLat = 0;
3016 else
3017 params->bU1devExitLat = DWC3_DEFAULT_U1_DEV_EXIT_LAT;
3018
3019 /* U2 Device exit Latency */
3020 if (dwc->dis_u2_entry_quirk)
3021 params->bU2DevExitLat = 0;
3022 else
3023 params->bU2DevExitLat =
3024 cpu_to_le16(DWC3_DEFAULT_U2_DEV_EXIT_LAT);
3025}
3026
3027static void dwc3_gadget_set_speed(struct usb_gadget *g,
3028 enum usb_device_speed speed)
3029{
3030 struct dwc3 *dwc = gadget_to_dwc(g);
3031 unsigned long flags;
3032
3033 spin_lock_irqsave(&dwc->lock, flags);
3034 dwc->gadget_max_speed = speed;
3035 spin_unlock_irqrestore(&dwc->lock, flags);
3036}
3037
3038static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
3039 enum usb_ssp_rate rate)
3040{
3041 struct dwc3 *dwc = gadget_to_dwc(g);
3042 unsigned long flags;
3043
3044 spin_lock_irqsave(&dwc->lock, flags);
3045 dwc->gadget_max_speed = USB_SPEED_SUPER_PLUS;
3046 dwc->gadget_ssp_rate = rate;
3047 spin_unlock_irqrestore(&dwc->lock, flags);
3048}
3049
3050static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
3051{
3052 struct dwc3 *dwc = gadget_to_dwc(g);
3053 union power_supply_propval val = {0};
3054 int ret;
3055
3056 if (dwc->usb2_phy)
3057 return usb_phy_set_power(dwc->usb2_phy, mA);
3058
3059 if (!dwc->usb_psy)
3060 return -EOPNOTSUPP;
3061
3062 val.intval = 1000 * mA;
3063 ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
3064
3065 return ret;
3066}
3067
3068/**
3069 * dwc3_gadget_check_config - ensure dwc3 can support the USB configuration
3070 * @g: pointer to the USB gadget
3071 *
3072 * Used to record the maximum number of endpoints being used in a USB composite
3073 * device. (across all configurations) This is to be used in the calculation
3074 * of the TXFIFO sizes when resizing internal memory for individual endpoints.
3075 * It will help ensured that the resizing logic reserves enough space for at
3076 * least one max packet.
3077 */
3078static int dwc3_gadget_check_config(struct usb_gadget *g)
3079{
3080 struct dwc3 *dwc = gadget_to_dwc(g);
3081 struct usb_ep *ep;
3082 int fifo_size = 0;
3083 int ram1_depth;
3084 int ep_num = 0;
3085
3086 if (!dwc->do_fifo_resize)
3087 return 0;
3088
3089 list_for_each_entry(ep, &g->ep_list, ep_list) {
3090 /* Only interested in the IN endpoints */
3091 if (ep->claimed && (ep->address & USB_DIR_IN))
3092 ep_num++;
3093 }
3094
3095 if (ep_num <= dwc->max_cfg_eps)
3096 return 0;
3097
3098 /* Update the max number of eps in the composition */
3099 dwc->max_cfg_eps = ep_num;
3100
3101 fifo_size = dwc3_gadget_calc_tx_fifo_size(dwc, dwc->max_cfg_eps);
3102 /* Based on the equation, increment by one for every ep */
3103 fifo_size += dwc->max_cfg_eps;
3104
3105 /* Check if we can fit a single fifo per endpoint */
3106 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
3107 if (fifo_size > ram1_depth)
3108 return -ENOMEM;
3109
3110 return 0;
3111}
3112
3113static void dwc3_gadget_async_callbacks(struct usb_gadget *g, bool enable)
3114{
3115 struct dwc3 *dwc = gadget_to_dwc(g);
3116 unsigned long flags;
3117
3118 spin_lock_irqsave(&dwc->lock, flags);
3119 dwc->async_callbacks = enable;
3120 spin_unlock_irqrestore(&dwc->lock, flags);
3121}
3122
3123static const struct usb_gadget_ops dwc3_gadget_ops = {
3124 .get_frame = dwc3_gadget_get_frame,
3125 .wakeup = dwc3_gadget_wakeup,
3126 .func_wakeup = dwc3_gadget_func_wakeup,
3127 .set_remote_wakeup = dwc3_gadget_set_remote_wakeup,
3128 .set_selfpowered = dwc3_gadget_set_selfpowered,
3129 .pullup = dwc3_gadget_pullup,
3130 .udc_start = dwc3_gadget_start,
3131 .udc_stop = dwc3_gadget_stop,
3132 .udc_set_speed = dwc3_gadget_set_speed,
3133 .udc_set_ssp_rate = dwc3_gadget_set_ssp_rate,
3134 .get_config_params = dwc3_gadget_config_params,
3135 .vbus_draw = dwc3_gadget_vbus_draw,
3136 .check_config = dwc3_gadget_check_config,
3137 .udc_async_callbacks = dwc3_gadget_async_callbacks,
3138};
3139
3140/* -------------------------------------------------------------------------- */
3141
3142static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
3143{
3144 struct dwc3 *dwc = dep->dwc;
3145
3146 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
3147 dep->endpoint.maxburst = 1;
3148 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
3149 if (!dep->direction)
3150 dwc->gadget->ep0 = &dep->endpoint;
3151
3152 dep->endpoint.caps.type_control = true;
3153
3154 return 0;
3155}
3156
3157static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
3158{
3159 struct dwc3 *dwc = dep->dwc;
3160 u32 mdwidth;
3161 int size;
3162 int maxpacket;
3163
3164 mdwidth = dwc3_mdwidth(dwc);
3165
3166 /* MDWIDTH is represented in bits, we need it in bytes */
3167 mdwidth /= 8;
3168
3169 size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
3170 if (DWC3_IP_IS(DWC3))
3171 size = DWC3_GTXFIFOSIZ_TXFDEP(size);
3172 else
3173 size = DWC31_GTXFIFOSIZ_TXFDEP(size);
3174
3175 /*
3176 * maxpacket size is determined as part of the following, after assuming
3177 * a mult value of one maxpacket:
3178 * DWC3 revision 280A and prior:
3179 * fifo_size = mult * (max_packet / mdwidth) + 1;
3180 * maxpacket = mdwidth * (fifo_size - 1);
3181 *
3182 * DWC3 revision 290A and onwards:
3183 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
3184 * maxpacket = mdwidth * ((fifo_size - 1) - 1) - mdwidth;
3185 */
3186 if (DWC3_VER_IS_PRIOR(DWC3, 290A))
3187 maxpacket = mdwidth * (size - 1);
3188 else
3189 maxpacket = mdwidth * ((size - 1) - 1) - mdwidth;
3190
3191 /* Functionally, space for one max packet is sufficient */
3192 size = min_t(int, maxpacket, 1024);
3193 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
3194
3195 dep->endpoint.max_streams = 16;
3196 dep->endpoint.ops = &dwc3_gadget_ep_ops;
3197 list_add_tail(&dep->endpoint.ep_list,
3198 &dwc->gadget->ep_list);
3199 dep->endpoint.caps.type_iso = true;
3200 dep->endpoint.caps.type_bulk = true;
3201 dep->endpoint.caps.type_int = true;
3202
3203 return dwc3_alloc_trb_pool(dep);
3204}
3205
3206static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
3207{
3208 struct dwc3 *dwc = dep->dwc;
3209 u32 mdwidth;
3210 int size;
3211
3212 mdwidth = dwc3_mdwidth(dwc);
3213
3214 /* MDWIDTH is represented in bits, convert to bytes */
3215 mdwidth /= 8;
3216
3217 /* All OUT endpoints share a single RxFIFO space */
3218 size = dwc3_readl(dwc->regs, DWC3_GRXFIFOSIZ(0));
3219 if (DWC3_IP_IS(DWC3))
3220 size = DWC3_GRXFIFOSIZ_RXFDEP(size);
3221 else
3222 size = DWC31_GRXFIFOSIZ_RXFDEP(size);
3223
3224 /* FIFO depth is in MDWDITH bytes */
3225 size *= mdwidth;
3226
3227 /*
3228 * To meet performance requirement, a minimum recommended RxFIFO size
3229 * is defined as follow:
3230 * RxFIFO size >= (3 x MaxPacketSize) +
3231 * (3 x 8 bytes setup packets size) + (16 bytes clock crossing margin)
3232 *
3233 * Then calculate the max packet limit as below.
3234 */
3235 size -= (3 * 8) + 16;
3236 if (size < 0)
3237 size = 0;
3238 else
3239 size /= 3;
3240
3241 usb_ep_set_maxpacket_limit(&dep->endpoint, size);
3242 dep->endpoint.max_streams = 16;
3243 dep->endpoint.ops = &dwc3_gadget_ep_ops;
3244 list_add_tail(&dep->endpoint.ep_list,
3245 &dwc->gadget->ep_list);
3246 dep->endpoint.caps.type_iso = true;
3247 dep->endpoint.caps.type_bulk = true;
3248 dep->endpoint.caps.type_int = true;
3249
3250 return dwc3_alloc_trb_pool(dep);
3251}
3252
3253static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
3254{
3255 struct dwc3_ep *dep;
3256 bool direction = epnum & 1;
3257 int ret;
3258 u8 num = epnum >> 1;
3259
3260 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
3261 if (!dep)
3262 return -ENOMEM;
3263
3264 dep->dwc = dwc;
3265 dep->number = epnum;
3266 dep->direction = direction;
3267 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
3268 dwc->eps[epnum] = dep;
3269 dep->combo_num = 0;
3270 dep->start_cmd_status = 0;
3271
3272 snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
3273 direction ? "in" : "out");
3274
3275 dep->endpoint.name = dep->name;
3276
3277 if (!(dep->number > 1)) {
3278 dep->endpoint.desc = &dwc3_gadget_ep0_desc;
3279 dep->endpoint.comp_desc = NULL;
3280 }
3281
3282 if (num == 0)
3283 ret = dwc3_gadget_init_control_endpoint(dep);
3284 else if (direction)
3285 ret = dwc3_gadget_init_in_endpoint(dep);
3286 else
3287 ret = dwc3_gadget_init_out_endpoint(dep);
3288
3289 if (ret)
3290 return ret;
3291
3292 dep->endpoint.caps.dir_in = direction;
3293 dep->endpoint.caps.dir_out = !direction;
3294
3295 INIT_LIST_HEAD(&dep->pending_list);
3296 INIT_LIST_HEAD(&dep->started_list);
3297 INIT_LIST_HEAD(&dep->cancelled_list);
3298
3299 dwc3_debugfs_create_endpoint_dir(dep);
3300
3301 return 0;
3302}
3303
3304static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
3305{
3306 u8 epnum;
3307
3308 INIT_LIST_HEAD(&dwc->gadget->ep_list);
3309
3310 for (epnum = 0; epnum < total; epnum++) {
3311 int ret;
3312
3313 ret = dwc3_gadget_init_endpoint(dwc, epnum);
3314 if (ret)
3315 return ret;
3316 }
3317
3318 return 0;
3319}
3320
3321static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
3322{
3323 struct dwc3_ep *dep;
3324 u8 epnum;
3325
3326 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
3327 dep = dwc->eps[epnum];
3328 if (!dep)
3329 continue;
3330 /*
3331 * Physical endpoints 0 and 1 are special; they form the
3332 * bi-directional USB endpoint 0.
3333 *
3334 * For those two physical endpoints, we don't allocate a TRB
3335 * pool nor do we add them the endpoints list. Due to that, we
3336 * shouldn't do these two operations otherwise we would end up
3337 * with all sorts of bugs when removing dwc3.ko.
3338 */
3339 if (epnum != 0 && epnum != 1) {
3340 dwc3_free_trb_pool(dep);
3341 list_del(&dep->endpoint.ep_list);
3342 }
3343
3344 dwc3_debugfs_remove_endpoint_dir(dep);
3345 kfree(dep);
3346 }
3347}
3348
3349/* -------------------------------------------------------------------------- */
3350
3351static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
3352 struct dwc3_request *req, struct dwc3_trb *trb,
3353 const struct dwc3_event_depevt *event, int status, int chain)
3354{
3355 unsigned int count;
3356
3357 dwc3_ep_inc_deq(dep);
3358
3359 trace_dwc3_complete_trb(dep, trb);
3360 req->num_trbs--;
3361
3362 /*
3363 * If we're in the middle of series of chained TRBs and we
3364 * receive a short transfer along the way, DWC3 will skip
3365 * through all TRBs including the last TRB in the chain (the
3366 * where CHN bit is zero. DWC3 will also avoid clearing HWO
3367 * bit and SW has to do it manually.
3368 *
3369 * We're going to do that here to avoid problems of HW trying
3370 * to use bogus TRBs for transfers.
3371 */
3372 if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
3373 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
3374
3375 /*
3376 * For isochronous transfers, the first TRB in a service interval must
3377 * have the Isoc-First type. Track and report its interval frame number.
3378 */
3379 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
3380 (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) {
3381 unsigned int frame_number;
3382
3383 frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl);
3384 frame_number &= ~(dep->interval - 1);
3385 req->request.frame_number = frame_number;
3386 }
3387
3388 /*
3389 * We use bounce buffer for requests that needs extra TRB or OUT ZLP. If
3390 * this TRB points to the bounce buffer address, it's a MPS alignment
3391 * TRB. Don't add it to req->remaining calculation.
3392 */
3393 if (trb->bpl == lower_32_bits(dep->dwc->bounce_addr) &&
3394 trb->bph == upper_32_bits(dep->dwc->bounce_addr)) {
3395 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
3396 return 1;
3397 }
3398
3399 count = trb->size & DWC3_TRB_SIZE_MASK;
3400 req->remaining += count;
3401
3402 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
3403 return 1;
3404
3405 if (event->status & DEPEVT_STATUS_SHORT && !chain)
3406 return 1;
3407
3408 if ((trb->ctrl & DWC3_TRB_CTRL_ISP_IMI) &&
3409 DWC3_TRB_SIZE_TRBSTS(trb->size) == DWC3_TRBSTS_MISSED_ISOC)
3410 return 1;
3411
3412 if ((trb->ctrl & DWC3_TRB_CTRL_IOC) ||
3413 (trb->ctrl & DWC3_TRB_CTRL_LST))
3414 return 1;
3415
3416 return 0;
3417}
3418
3419static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
3420 struct dwc3_request *req, const struct dwc3_event_depevt *event,
3421 int status)
3422{
3423 struct dwc3_trb *trb;
3424 struct scatterlist *sg = req->sg;
3425 struct scatterlist *s;
3426 unsigned int num_queued = req->num_queued_sgs;
3427 unsigned int i;
3428 int ret = 0;
3429
3430 for_each_sg(sg, s, num_queued, i) {
3431 trb = &dep->trb_pool[dep->trb_dequeue];
3432
3433 req->sg = sg_next(s);
3434 req->num_queued_sgs--;
3435
3436 ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
3437 trb, event, status, true);
3438 if (ret)
3439 break;
3440 }
3441
3442 return ret;
3443}
3444
3445static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
3446 struct dwc3_request *req, const struct dwc3_event_depevt *event,
3447 int status)
3448{
3449 struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
3450
3451 return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
3452 event, status, false);
3453}
3454
3455static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
3456{
3457 return req->num_pending_sgs == 0 && req->num_queued_sgs == 0;
3458}
3459
3460static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
3461 const struct dwc3_event_depevt *event,
3462 struct dwc3_request *req, int status)
3463{
3464 int request_status;
3465 int ret;
3466
3467 if (req->request.num_mapped_sgs)
3468 ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
3469 status);
3470 else
3471 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
3472 status);
3473
3474 req->request.actual = req->request.length - req->remaining;
3475
3476 if (!dwc3_gadget_ep_request_completed(req))
3477 goto out;
3478
3479 if (req->needs_extra_trb) {
3480 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
3481 status);
3482 req->needs_extra_trb = false;
3483 }
3484
3485 /*
3486 * The event status only reflects the status of the TRB with IOC set.
3487 * For the requests that don't set interrupt on completion, the driver
3488 * needs to check and return the status of the completed TRBs associated
3489 * with the request. Use the status of the last TRB of the request.
3490 */
3491 if (req->request.no_interrupt) {
3492 struct dwc3_trb *trb;
3493
3494 trb = dwc3_ep_prev_trb(dep, dep->trb_dequeue);
3495 switch (DWC3_TRB_SIZE_TRBSTS(trb->size)) {
3496 case DWC3_TRBSTS_MISSED_ISOC:
3497 /* Isoc endpoint only */
3498 request_status = -EXDEV;
3499 break;
3500 case DWC3_TRB_STS_XFER_IN_PROG:
3501 /* Applicable when End Transfer with ForceRM=0 */
3502 case DWC3_TRBSTS_SETUP_PENDING:
3503 /* Control endpoint only */
3504 case DWC3_TRBSTS_OK:
3505 default:
3506 request_status = 0;
3507 break;
3508 }
3509 } else {
3510 request_status = status;
3511 }
3512
3513 dwc3_gadget_giveback(dep, req, request_status);
3514
3515out:
3516 return ret;
3517}
3518
3519static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
3520 const struct dwc3_event_depevt *event, int status)
3521{
3522 struct dwc3_request *req;
3523
3524 while (!list_empty(&dep->started_list)) {
3525 int ret;
3526
3527 req = next_request(&dep->started_list);
3528 ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
3529 req, status);
3530 if (ret)
3531 break;
3532 /*
3533 * The endpoint is disabled, let the dwc3_remove_requests()
3534 * handle the cleanup.
3535 */
3536 if (!dep->endpoint.desc)
3537 break;
3538 }
3539}
3540
3541static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)
3542{
3543 struct dwc3_request *req;
3544 struct dwc3 *dwc = dep->dwc;
3545
3546 if (!dep->endpoint.desc || !dwc->pullups_connected ||
3547 !dwc->connected)
3548 return false;
3549
3550 if (!list_empty(&dep->pending_list))
3551 return true;
3552
3553 /*
3554 * We only need to check the first entry of the started list. We can
3555 * assume the completed requests are removed from the started list.
3556 */
3557 req = next_request(&dep->started_list);
3558 if (!req)
3559 return false;
3560
3561 return !dwc3_gadget_ep_request_completed(req);
3562}
3563
3564static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
3565 const struct dwc3_event_depevt *event)
3566{
3567 dep->frame_number = event->parameters;
3568}
3569
3570static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
3571 const struct dwc3_event_depevt *event, int status)
3572{
3573 struct dwc3 *dwc = dep->dwc;
3574 bool no_started_trb = true;
3575
3576 dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
3577
3578 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
3579 goto out;
3580
3581 if (!dep->endpoint.desc)
3582 return no_started_trb;
3583
3584 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
3585 list_empty(&dep->started_list) &&
3586 (list_empty(&dep->pending_list) || status == -EXDEV))
3587 dwc3_stop_active_transfer(dep, true, true);
3588 else if (dwc3_gadget_ep_should_continue(dep))
3589 if (__dwc3_gadget_kick_transfer(dep) == 0)
3590 no_started_trb = false;
3591
3592out:
3593 /*
3594 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
3595 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
3596 */
3597 if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
3598 u32 reg;
3599 int i;
3600
3601 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
3602 dep = dwc->eps[i];
3603
3604 if (!(dep->flags & DWC3_EP_ENABLED))
3605 continue;
3606
3607 if (!list_empty(&dep->started_list))
3608 return no_started_trb;
3609 }
3610
3611 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3612 reg |= dwc->u1u2;
3613 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
3614
3615 dwc->u1u2 = 0;
3616 }
3617
3618 return no_started_trb;
3619}
3620
3621static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
3622 const struct dwc3_event_depevt *event)
3623{
3624 int status = 0;
3625
3626 if (!dep->endpoint.desc)
3627 return;
3628
3629 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
3630 dwc3_gadget_endpoint_frame_from_event(dep, event);
3631
3632 if (event->status & DEPEVT_STATUS_BUSERR)
3633 status = -ECONNRESET;
3634
3635 if (event->status & DEPEVT_STATUS_MISSED_ISOC)
3636 status = -EXDEV;
3637
3638 dwc3_gadget_endpoint_trbs_complete(dep, event, status);
3639}
3640
3641static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep,
3642 const struct dwc3_event_depevt *event)
3643{
3644 int status = 0;
3645
3646 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
3647
3648 if (event->status & DEPEVT_STATUS_BUSERR)
3649 status = -ECONNRESET;
3650
3651 if (dwc3_gadget_endpoint_trbs_complete(dep, event, status))
3652 dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
3653}
3654
3655static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
3656 const struct dwc3_event_depevt *event)
3657{
3658 dwc3_gadget_endpoint_frame_from_event(dep, event);
3659
3660 /*
3661 * The XferNotReady event is generated only once before the endpoint
3662 * starts. It will be generated again when END_TRANSFER command is
3663 * issued. For some controller versions, the XferNotReady event may be
3664 * generated while the END_TRANSFER command is still in process. Ignore
3665 * it and wait for the next XferNotReady event after the command is
3666 * completed.
3667 */
3668 if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
3669 return;
3670
3671 (void) __dwc3_gadget_start_isoc(dep);
3672}
3673
3674static void dwc3_gadget_endpoint_command_complete(struct dwc3_ep *dep,
3675 const struct dwc3_event_depevt *event)
3676{
3677 u8 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
3678
3679 if (cmd != DWC3_DEPCMD_ENDTRANSFER)
3680 return;
3681
3682 /*
3683 * The END_TRANSFER command will cause the controller to generate a
3684 * NoStream Event, and it's not due to the host DP NoStream rejection.
3685 * Ignore the next NoStream event.
3686 */
3687 if (dep->stream_capable)
3688 dep->flags |= DWC3_EP_IGNORE_NEXT_NOSTREAM;
3689
3690 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
3691 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
3692 dwc3_gadget_ep_cleanup_cancelled_requests(dep);
3693
3694 if (dep->flags & DWC3_EP_PENDING_CLEAR_STALL) {
3695 struct dwc3 *dwc = dep->dwc;
3696
3697 dep->flags &= ~DWC3_EP_PENDING_CLEAR_STALL;
3698 if (dwc3_send_clear_stall_ep_cmd(dep)) {
3699 struct usb_ep *ep0 = &dwc->eps[0]->endpoint;
3700
3701 dev_err(dwc->dev, "failed to clear STALL on %s\n", dep->name);
3702 if (dwc->delayed_status)
3703 __dwc3_gadget_ep0_set_halt(ep0, 1);
3704 return;
3705 }
3706
3707 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
3708 if (dwc->clear_stall_protocol == dep->number)
3709 dwc3_ep0_send_delayed_status(dwc);
3710 }
3711
3712 if ((dep->flags & DWC3_EP_DELAY_START) &&
3713 !usb_endpoint_xfer_isoc(dep->endpoint.desc))
3714 __dwc3_gadget_kick_transfer(dep);
3715
3716 dep->flags &= ~DWC3_EP_DELAY_START;
3717}
3718
3719static void dwc3_gadget_endpoint_stream_event(struct dwc3_ep *dep,
3720 const struct dwc3_event_depevt *event)
3721{
3722 struct dwc3 *dwc = dep->dwc;
3723
3724 if (event->status == DEPEVT_STREAMEVT_FOUND) {
3725 dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
3726 goto out;
3727 }
3728
3729 /* Note: NoStream rejection event param value is 0 and not 0xFFFF */
3730 switch (event->parameters) {
3731 case DEPEVT_STREAM_PRIME:
3732 /*
3733 * If the host can properly transition the endpoint state from
3734 * idle to prime after a NoStream rejection, there's no need to
3735 * force restarting the endpoint to reinitiate the stream. To
3736 * simplify the check, assume the host follows the USB spec if
3737 * it primed the endpoint more than once.
3738 */
3739 if (dep->flags & DWC3_EP_FORCE_RESTART_STREAM) {
3740 if (dep->flags & DWC3_EP_FIRST_STREAM_PRIMED)
3741 dep->flags &= ~DWC3_EP_FORCE_RESTART_STREAM;
3742 else
3743 dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
3744 }
3745
3746 break;
3747 case DEPEVT_STREAM_NOSTREAM:
3748 if ((dep->flags & DWC3_EP_IGNORE_NEXT_NOSTREAM) ||
3749 !(dep->flags & DWC3_EP_FORCE_RESTART_STREAM) ||
3750 (!DWC3_MST_CAPABLE(&dwc->hwparams) &&
3751 !(dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)))
3752 break;
3753
3754 /*
3755 * If the host rejects a stream due to no active stream, by the
3756 * USB and xHCI spec, the endpoint will be put back to idle
3757 * state. When the host is ready (buffer added/updated), it will
3758 * prime the endpoint to inform the usb device controller. This
3759 * triggers the device controller to issue ERDY to restart the
3760 * stream. However, some hosts don't follow this and keep the
3761 * endpoint in the idle state. No prime will come despite host
3762 * streams are updated, and the device controller will not be
3763 * triggered to generate ERDY to move the next stream data. To
3764 * workaround this and maintain compatibility with various
3765 * hosts, force to reinitiate the stream until the host is ready
3766 * instead of waiting for the host to prime the endpoint.
3767 */
3768 if (DWC3_VER_IS_WITHIN(DWC32, 100A, ANY)) {
3769 unsigned int cmd = DWC3_DGCMD_SET_ENDPOINT_PRIME;
3770
3771 dwc3_send_gadget_generic_command(dwc, cmd, dep->number);
3772 } else {
3773 dep->flags |= DWC3_EP_DELAY_START;
3774 dwc3_stop_active_transfer(dep, true, true);
3775 return;
3776 }
3777 break;
3778 }
3779
3780out:
3781 dep->flags &= ~DWC3_EP_IGNORE_NEXT_NOSTREAM;
3782}
3783
3784static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
3785 const struct dwc3_event_depevt *event)
3786{
3787 struct dwc3_ep *dep;
3788 u8 epnum = event->endpoint_number;
3789
3790 dep = dwc->eps[epnum];
3791
3792 if (!(dep->flags & DWC3_EP_ENABLED)) {
3793 if ((epnum > 1) && !(dep->flags & DWC3_EP_TRANSFER_STARTED))
3794 return;
3795
3796 /* Handle only EPCMDCMPLT when EP disabled */
3797 if ((event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT) &&
3798 !(epnum <= 1 && event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE))
3799 return;
3800 }
3801
3802 if (epnum == 0 || epnum == 1) {
3803 dwc3_ep0_interrupt(dwc, event);
3804 return;
3805 }
3806
3807 switch (event->endpoint_event) {
3808 case DWC3_DEPEVT_XFERINPROGRESS:
3809 dwc3_gadget_endpoint_transfer_in_progress(dep, event);
3810 break;
3811 case DWC3_DEPEVT_XFERNOTREADY:
3812 dwc3_gadget_endpoint_transfer_not_ready(dep, event);
3813 break;
3814 case DWC3_DEPEVT_EPCMDCMPLT:
3815 dwc3_gadget_endpoint_command_complete(dep, event);
3816 break;
3817 case DWC3_DEPEVT_XFERCOMPLETE:
3818 dwc3_gadget_endpoint_transfer_complete(dep, event);
3819 break;
3820 case DWC3_DEPEVT_STREAMEVT:
3821 dwc3_gadget_endpoint_stream_event(dep, event);
3822 break;
3823 case DWC3_DEPEVT_RXTXFIFOEVT:
3824 break;
3825 default:
3826 dev_err(dwc->dev, "unknown endpoint event %d\n", event->endpoint_event);
3827 break;
3828 }
3829}
3830
3831static void dwc3_disconnect_gadget(struct dwc3 *dwc)
3832{
3833 if (dwc->async_callbacks && dwc->gadget_driver->disconnect) {
3834 spin_unlock(&dwc->lock);
3835 dwc->gadget_driver->disconnect(dwc->gadget);
3836 spin_lock(&dwc->lock);
3837 }
3838}
3839
3840static void dwc3_suspend_gadget(struct dwc3 *dwc)
3841{
3842 if (dwc->async_callbacks && dwc->gadget_driver->suspend) {
3843 spin_unlock(&dwc->lock);
3844 dwc->gadget_driver->suspend(dwc->gadget);
3845 spin_lock(&dwc->lock);
3846 }
3847}
3848
3849static void dwc3_resume_gadget(struct dwc3 *dwc)
3850{
3851 if (dwc->async_callbacks && dwc->gadget_driver->resume) {
3852 spin_unlock(&dwc->lock);
3853 dwc->gadget_driver->resume(dwc->gadget);
3854 spin_lock(&dwc->lock);
3855 }
3856}
3857
3858static void dwc3_reset_gadget(struct dwc3 *dwc)
3859{
3860 if (!dwc->gadget_driver)
3861 return;
3862
3863 if (dwc->async_callbacks && dwc->gadget->speed != USB_SPEED_UNKNOWN) {
3864 spin_unlock(&dwc->lock);
3865 usb_gadget_udc_reset(dwc->gadget, dwc->gadget_driver);
3866 spin_lock(&dwc->lock);
3867 }
3868}
3869
3870void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
3871 bool interrupt)
3872{
3873 struct dwc3 *dwc = dep->dwc;
3874
3875 /*
3876 * Only issue End Transfer command to the control endpoint of a started
3877 * Data Phase. Typically we should only do so in error cases such as
3878 * invalid/unexpected direction as described in the control transfer
3879 * flow of the programming guide.
3880 */
3881 if (dep->number <= 1 && dwc->ep0state != EP0_DATA_PHASE)
3882 return;
3883
3884 if (interrupt && (dep->flags & DWC3_EP_DELAY_STOP))
3885 return;
3886
3887 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
3888 (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
3889 return;
3890
3891 /*
3892 * If a Setup packet is received but yet to DMA out, the controller will
3893 * not process the End Transfer command of any endpoint. Polling of its
3894 * DEPCMD.CmdAct may block setting up TRB for Setup packet, causing a
3895 * timeout. Delay issuing the End Transfer command until the Setup TRB is
3896 * prepared.
3897 */
3898 if (dwc->ep0state != EP0_SETUP_PHASE && !dwc->delayed_status) {
3899 dep->flags |= DWC3_EP_DELAY_STOP;
3900 return;
3901 }
3902
3903 /*
3904 * NOTICE: We are violating what the Databook says about the
3905 * EndTransfer command. Ideally we would _always_ wait for the
3906 * EndTransfer Command Completion IRQ, but that's causing too
3907 * much trouble synchronizing between us and gadget driver.
3908 *
3909 * We have discussed this with the IP Provider and it was
3910 * suggested to giveback all requests here.
3911 *
3912 * Note also that a similar handling was tested by Synopsys
3913 * (thanks a lot Paul) and nothing bad has come out of it.
3914 * In short, what we're doing is issuing EndTransfer with
3915 * CMDIOC bit set and delay kicking transfer until the
3916 * EndTransfer command had completed.
3917 *
3918 * As of IP version 3.10a of the DWC_usb3 IP, the controller
3919 * supports a mode to work around the above limitation. The
3920 * software can poll the CMDACT bit in the DEPCMD register
3921 * after issuing a EndTransfer command. This mode is enabled
3922 * by writing GUCTL2[14]. This polling is already done in the
3923 * dwc3_send_gadget_ep_cmd() function so if the mode is
3924 * enabled, the EndTransfer command will have completed upon
3925 * returning from this function.
3926 *
3927 * This mode is NOT available on the DWC_usb31 IP. In this
3928 * case, if the IOC bit is not set, then delay by 1ms
3929 * after issuing the EndTransfer command. This allows for the
3930 * controller to handle the command completely before DWC3
3931 * remove requests attempts to unmap USB request buffers.
3932 */
3933
3934 __dwc3_stop_active_transfer(dep, force, interrupt);
3935}
3936
3937static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
3938{
3939 u32 epnum;
3940
3941 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
3942 struct dwc3_ep *dep;
3943 int ret;
3944
3945 dep = dwc->eps[epnum];
3946 if (!dep)
3947 continue;
3948
3949 if (!(dep->flags & DWC3_EP_STALL))
3950 continue;
3951
3952 dep->flags &= ~DWC3_EP_STALL;
3953
3954 ret = dwc3_send_clear_stall_ep_cmd(dep);
3955 WARN_ON_ONCE(ret);
3956 }
3957}
3958
3959static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
3960{
3961 int reg;
3962
3963 dwc->suspended = false;
3964
3965 dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
3966
3967 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3968 reg &= ~DWC3_DCTL_INITU1ENA;
3969 reg &= ~DWC3_DCTL_INITU2ENA;
3970 dwc3_gadget_dctl_write_safe(dwc, reg);
3971
3972 dwc->connected = false;
3973
3974 dwc3_disconnect_gadget(dwc);
3975
3976 dwc->gadget->speed = USB_SPEED_UNKNOWN;
3977 dwc->setup_packet_pending = false;
3978 dwc->gadget->wakeup_armed = false;
3979 dwc3_gadget_enable_linksts_evts(dwc, false);
3980 usb_gadget_set_state(dwc->gadget, USB_STATE_NOTATTACHED);
3981
3982 dwc3_ep0_reset_state(dwc);
3983
3984 /*
3985 * Request PM idle to address condition where usage count is
3986 * already decremented to zero, but waiting for the disconnect
3987 * interrupt to set dwc->connected to FALSE.
3988 */
3989 pm_request_idle(dwc->dev);
3990}
3991
3992static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
3993{
3994 u32 reg;
3995
3996 dwc->suspended = false;
3997
3998 /*
3999 * Ideally, dwc3_reset_gadget() would trigger the function
4000 * drivers to stop any active transfers through ep disable.
4001 * However, for functions which defer ep disable, such as mass
4002 * storage, we will need to rely on the call to stop active
4003 * transfers here, and avoid allowing of request queuing.
4004 */
4005 dwc->connected = false;
4006
4007 /*
4008 * WORKAROUND: DWC3 revisions <1.88a have an issue which
4009 * would cause a missing Disconnect Event if there's a
4010 * pending Setup Packet in the FIFO.
4011 *
4012 * There's no suggested workaround on the official Bug
4013 * report, which states that "unless the driver/application
4014 * is doing any special handling of a disconnect event,
4015 * there is no functional issue".
4016 *
4017 * Unfortunately, it turns out that we _do_ some special
4018 * handling of a disconnect event, namely complete all
4019 * pending transfers, notify gadget driver of the
4020 * disconnection, and so on.
4021 *
4022 * Our suggested workaround is to follow the Disconnect
4023 * Event steps here, instead, based on a setup_packet_pending
4024 * flag. Such flag gets set whenever we have a SETUP_PENDING
4025 * status for EP0 TRBs and gets cleared on XferComplete for the
4026 * same endpoint.
4027 *
4028 * Refers to:
4029 *
4030 * STAR#9000466709: RTL: Device : Disconnect event not
4031 * generated if setup packet pending in FIFO
4032 */
4033 if (DWC3_VER_IS_PRIOR(DWC3, 188A)) {
4034 if (dwc->setup_packet_pending)
4035 dwc3_gadget_disconnect_interrupt(dwc);
4036 }
4037
4038 dwc3_reset_gadget(dwc);
4039
4040 /*
4041 * From SNPS databook section 8.1.2, the EP0 should be in setup
4042 * phase. So ensure that EP0 is in setup phase by issuing a stall
4043 * and restart if EP0 is not in setup phase.
4044 */
4045 dwc3_ep0_reset_state(dwc);
4046
4047 /*
4048 * In the Synopsis DesignWare Cores USB3 Databook Rev. 3.30a
4049 * Section 4.1.2 Table 4-2, it states that during a USB reset, the SW
4050 * needs to ensure that it sends "a DEPENDXFER command for any active
4051 * transfers."
4052 */
4053 dwc3_stop_active_transfers(dwc);
4054 dwc->connected = true;
4055
4056 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4057 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
4058 dwc3_gadget_dctl_write_safe(dwc, reg);
4059 dwc->test_mode = false;
4060 dwc->gadget->wakeup_armed = false;
4061 dwc3_gadget_enable_linksts_evts(dwc, false);
4062 dwc3_clear_stall_all_ep(dwc);
4063
4064 /* Reset device address to zero */
4065 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
4066 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
4067 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
4068}
4069
4070static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
4071{
4072 struct dwc3_ep *dep;
4073 int ret;
4074 u32 reg;
4075 u8 lanes = 1;
4076 u8 speed;
4077
4078 if (!dwc->softconnect)
4079 return;
4080
4081 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
4082 speed = reg & DWC3_DSTS_CONNECTSPD;
4083 dwc->speed = speed;
4084
4085 if (DWC3_IP_IS(DWC32))
4086 lanes = DWC3_DSTS_CONNLANES(reg) + 1;
4087
4088 dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;
4089
4090 /*
4091 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
4092 * each time on Connect Done.
4093 *
4094 * Currently we always use the reset value. If any platform
4095 * wants to set this to a different value, we need to add a
4096 * setting and update GCTL.RAMCLKSEL here.
4097 */
4098
4099 switch (speed) {
4100 case DWC3_DSTS_SUPERSPEED_PLUS:
4101 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
4102 dwc->gadget->ep0->maxpacket = 512;
4103 dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
4104
4105 if (lanes > 1)
4106 dwc->gadget->ssp_rate = USB_SSP_GEN_2x2;
4107 else
4108 dwc->gadget->ssp_rate = USB_SSP_GEN_2x1;
4109 break;
4110 case DWC3_DSTS_SUPERSPEED:
4111 /*
4112 * WORKAROUND: DWC3 revisions <1.90a have an issue which
4113 * would cause a missing USB3 Reset event.
4114 *
4115 * In such situations, we should force a USB3 Reset
4116 * event by calling our dwc3_gadget_reset_interrupt()
4117 * routine.
4118 *
4119 * Refers to:
4120 *
4121 * STAR#9000483510: RTL: SS : USB3 reset event may
4122 * not be generated always when the link enters poll
4123 */
4124 if (DWC3_VER_IS_PRIOR(DWC3, 190A))
4125 dwc3_gadget_reset_interrupt(dwc);
4126
4127 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
4128 dwc->gadget->ep0->maxpacket = 512;
4129 dwc->gadget->speed = USB_SPEED_SUPER;
4130
4131 if (lanes > 1) {
4132 dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
4133 dwc->gadget->ssp_rate = USB_SSP_GEN_1x2;
4134 }
4135 break;
4136 case DWC3_DSTS_HIGHSPEED:
4137 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
4138 dwc->gadget->ep0->maxpacket = 64;
4139 dwc->gadget->speed = USB_SPEED_HIGH;
4140 break;
4141 case DWC3_DSTS_FULLSPEED:
4142 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
4143 dwc->gadget->ep0->maxpacket = 64;
4144 dwc->gadget->speed = USB_SPEED_FULL;
4145 break;
4146 }
4147
4148 dwc->eps[1]->endpoint.maxpacket = dwc->gadget->ep0->maxpacket;
4149
4150 /* Enable USB2 LPM Capability */
4151
4152 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A) &&
4153 !dwc->usb2_gadget_lpm_disable &&
4154 (speed != DWC3_DSTS_SUPERSPEED) &&
4155 (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
4156 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
4157 reg |= DWC3_DCFG_LPM_CAP;
4158 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
4159
4160 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4161 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
4162
4163 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
4164 (dwc->is_utmi_l1_suspend << 4));
4165
4166 /*
4167 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
4168 * DCFG.LPMCap is set, core responses with an ACK and the
4169 * BESL value in the LPM token is less than or equal to LPM
4170 * NYET threshold.
4171 */
4172 WARN_ONCE(DWC3_VER_IS_PRIOR(DWC3, 240A) && dwc->has_lpm_erratum,
4173 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
4174
4175 if (dwc->has_lpm_erratum && !DWC3_VER_IS_PRIOR(DWC3, 240A))
4176 reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);
4177
4178 dwc3_gadget_dctl_write_safe(dwc, reg);
4179 } else {
4180 if (dwc->usb2_gadget_lpm_disable) {
4181 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
4182 reg &= ~DWC3_DCFG_LPM_CAP;
4183 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
4184 }
4185
4186 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4187 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
4188 dwc3_gadget_dctl_write_safe(dwc, reg);
4189 }
4190
4191 dep = dwc->eps[0];
4192 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
4193 if (ret) {
4194 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
4195 return;
4196 }
4197
4198 dep = dwc->eps[1];
4199 ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
4200 if (ret) {
4201 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
4202 return;
4203 }
4204
4205 /*
4206 * Configure PHY via GUSB3PIPECTLn if required.
4207 *
4208 * Update GTXFIFOSIZn
4209 *
4210 * In both cases reset values should be sufficient.
4211 */
4212}
4213
4214static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
4215{
4216 dwc->suspended = false;
4217
4218 /*
4219 * TODO take core out of low power mode when that's
4220 * implemented.
4221 */
4222
4223 if (dwc->async_callbacks && dwc->gadget_driver->resume) {
4224 spin_unlock(&dwc->lock);
4225 dwc->gadget_driver->resume(dwc->gadget);
4226 spin_lock(&dwc->lock);
4227 }
4228
4229 dwc->link_state = evtinfo & DWC3_LINK_STATE_MASK;
4230}
4231
4232static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
4233 unsigned int evtinfo)
4234{
4235 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
4236 unsigned int pwropt;
4237
4238 /*
4239 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
4240 * Hibernation mode enabled which would show up when device detects
4241 * host-initiated U3 exit.
4242 *
4243 * In that case, device will generate a Link State Change Interrupt
4244 * from U3 to RESUME which is only necessary if Hibernation is
4245 * configured in.
4246 *
4247 * There are no functional changes due to such spurious event and we
4248 * just need to ignore it.
4249 *
4250 * Refers to:
4251 *
4252 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
4253 * operational mode
4254 */
4255 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
4256 if (DWC3_VER_IS_PRIOR(DWC3, 250A) &&
4257 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
4258 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
4259 (next == DWC3_LINK_STATE_RESUME)) {
4260 return;
4261 }
4262 }
4263
4264 /*
4265 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
4266 * on the link partner, the USB session might do multiple entry/exit
4267 * of low power states before a transfer takes place.
4268 *
4269 * Due to this problem, we might experience lower throughput. The
4270 * suggested workaround is to disable DCTL[12:9] bits if we're
4271 * transitioning from U1/U2 to U0 and enable those bits again
4272 * after a transfer completes and there are no pending transfers
4273 * on any of the enabled endpoints.
4274 *
4275 * This is the first half of that workaround.
4276 *
4277 * Refers to:
4278 *
4279 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
4280 * core send LGO_Ux entering U0
4281 */
4282 if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
4283 if (next == DWC3_LINK_STATE_U0) {
4284 u32 u1u2;
4285 u32 reg;
4286
4287 switch (dwc->link_state) {
4288 case DWC3_LINK_STATE_U1:
4289 case DWC3_LINK_STATE_U2:
4290 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
4291 u1u2 = reg & (DWC3_DCTL_INITU2ENA
4292 | DWC3_DCTL_ACCEPTU2ENA
4293 | DWC3_DCTL_INITU1ENA
4294 | DWC3_DCTL_ACCEPTU1ENA);
4295
4296 if (!dwc->u1u2)
4297 dwc->u1u2 = reg & u1u2;
4298
4299 reg &= ~u1u2;
4300
4301 dwc3_gadget_dctl_write_safe(dwc, reg);
4302 break;
4303 default:
4304 /* do nothing */
4305 break;
4306 }
4307 }
4308 }
4309
4310 switch (next) {
4311 case DWC3_LINK_STATE_U0:
4312 if (dwc->gadget->wakeup_armed) {
4313 dwc3_gadget_enable_linksts_evts(dwc, false);
4314 dwc3_resume_gadget(dwc);
4315 dwc->suspended = false;
4316 }
4317 break;
4318 case DWC3_LINK_STATE_U1:
4319 if (dwc->speed == USB_SPEED_SUPER)
4320 dwc3_suspend_gadget(dwc);
4321 break;
4322 case DWC3_LINK_STATE_U2:
4323 case DWC3_LINK_STATE_U3:
4324 dwc3_suspend_gadget(dwc);
4325 break;
4326 case DWC3_LINK_STATE_RESUME:
4327 dwc3_resume_gadget(dwc);
4328 break;
4329 default:
4330 /* do nothing */
4331 break;
4332 }
4333
4334 dwc->link_state = next;
4335}
4336
4337static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
4338 unsigned int evtinfo)
4339{
4340 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
4341
4342 if (!dwc->suspended && next == DWC3_LINK_STATE_U3) {
4343 dwc->suspended = true;
4344 dwc3_suspend_gadget(dwc);
4345 }
4346
4347 dwc->link_state = next;
4348}
4349
4350static void dwc3_gadget_interrupt(struct dwc3 *dwc,
4351 const struct dwc3_event_devt *event)
4352{
4353 switch (event->type) {
4354 case DWC3_DEVICE_EVENT_DISCONNECT:
4355 dwc3_gadget_disconnect_interrupt(dwc);
4356 break;
4357 case DWC3_DEVICE_EVENT_RESET:
4358 dwc3_gadget_reset_interrupt(dwc);
4359 break;
4360 case DWC3_DEVICE_EVENT_CONNECT_DONE:
4361 dwc3_gadget_conndone_interrupt(dwc);
4362 break;
4363 case DWC3_DEVICE_EVENT_WAKEUP:
4364 dwc3_gadget_wakeup_interrupt(dwc, event->event_info);
4365 break;
4366 case DWC3_DEVICE_EVENT_HIBER_REQ:
4367 dev_WARN_ONCE(dwc->dev, true, "unexpected hibernation event\n");
4368 break;
4369 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
4370 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
4371 break;
4372 case DWC3_DEVICE_EVENT_SUSPEND:
4373 /* It changed to be suspend event for version 2.30a and above */
4374 if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
4375 dwc3_gadget_suspend_interrupt(dwc, event->event_info);
4376 break;
4377 case DWC3_DEVICE_EVENT_SOF:
4378 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
4379 case DWC3_DEVICE_EVENT_CMD_CMPL:
4380 case DWC3_DEVICE_EVENT_OVERFLOW:
4381 break;
4382 default:
4383 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
4384 }
4385}
4386
4387static void dwc3_process_event_entry(struct dwc3 *dwc,
4388 const union dwc3_event *event)
4389{
4390 trace_dwc3_event(event->raw, dwc);
4391
4392 if (!event->type.is_devspec)
4393 dwc3_endpoint_interrupt(dwc, &event->depevt);
4394 else if (event->type.type == DWC3_EVENT_TYPE_DEV)
4395 dwc3_gadget_interrupt(dwc, &event->devt);
4396 else
4397 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
4398}
4399
4400static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
4401{
4402 struct dwc3 *dwc = evt->dwc;
4403 irqreturn_t ret = IRQ_NONE;
4404 int left;
4405
4406 left = evt->count;
4407
4408 if (!(evt->flags & DWC3_EVENT_PENDING))
4409 return IRQ_NONE;
4410
4411 while (left > 0) {
4412 union dwc3_event event;
4413
4414 event.raw = *(u32 *) (evt->cache + evt->lpos);
4415
4416 dwc3_process_event_entry(dwc, &event);
4417
4418 /*
4419 * FIXME we wrap around correctly to the next entry as
4420 * almost all entries are 4 bytes in size. There is one
4421 * entry which has 12 bytes which is a regular entry
4422 * followed by 8 bytes data. ATM I don't know how
4423 * things are organized if we get next to the a
4424 * boundary so I worry about that once we try to handle
4425 * that.
4426 */
4427 evt->lpos = (evt->lpos + 4) % evt->length;
4428 left -= 4;
4429 }
4430
4431 evt->count = 0;
4432 ret = IRQ_HANDLED;
4433
4434 /* Unmask interrupt */
4435 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
4436 DWC3_GEVNTSIZ_SIZE(evt->length));
4437
4438 if (dwc->imod_interval) {
4439 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
4440 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
4441 }
4442
4443 /* Keep the clearing of DWC3_EVENT_PENDING at the end */
4444 evt->flags &= ~DWC3_EVENT_PENDING;
4445
4446 return ret;
4447}
4448
4449static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
4450{
4451 struct dwc3_event_buffer *evt = _evt;
4452 struct dwc3 *dwc = evt->dwc;
4453 unsigned long flags;
4454 irqreturn_t ret = IRQ_NONE;
4455
4456 local_bh_disable();
4457 spin_lock_irqsave(&dwc->lock, flags);
4458 ret = dwc3_process_event_buf(evt);
4459 spin_unlock_irqrestore(&dwc->lock, flags);
4460 local_bh_enable();
4461
4462 return ret;
4463}
4464
4465static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
4466{
4467 struct dwc3 *dwc = evt->dwc;
4468 u32 amount;
4469 u32 count;
4470
4471 if (pm_runtime_suspended(dwc->dev)) {
4472 dwc->pending_events = true;
4473 /*
4474 * Trigger runtime resume. The get() function will be balanced
4475 * after processing the pending events in dwc3_process_pending
4476 * events().
4477 */
4478 pm_runtime_get(dwc->dev);
4479 disable_irq_nosync(dwc->irq_gadget);
4480 return IRQ_HANDLED;
4481 }
4482
4483 /*
4484 * With PCIe legacy interrupt, test shows that top-half irq handler can
4485 * be called again after HW interrupt deassertion. Check if bottom-half
4486 * irq event handler completes before caching new event to prevent
4487 * losing events.
4488 */
4489 if (evt->flags & DWC3_EVENT_PENDING)
4490 return IRQ_HANDLED;
4491
4492 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
4493 count &= DWC3_GEVNTCOUNT_MASK;
4494 if (!count)
4495 return IRQ_NONE;
4496
4497 evt->count = count;
4498 evt->flags |= DWC3_EVENT_PENDING;
4499
4500 /* Mask interrupt */
4501 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
4502 DWC3_GEVNTSIZ_INTMASK | DWC3_GEVNTSIZ_SIZE(evt->length));
4503
4504 amount = min(count, evt->length - evt->lpos);
4505 memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
4506
4507 if (amount < count)
4508 memcpy(evt->cache, evt->buf, count - amount);
4509
4510 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
4511
4512 return IRQ_WAKE_THREAD;
4513}
4514
4515static irqreturn_t dwc3_interrupt(int irq, void *_evt)
4516{
4517 struct dwc3_event_buffer *evt = _evt;
4518
4519 return dwc3_check_event_buf(evt);
4520}
4521
4522static int dwc3_gadget_get_irq(struct dwc3 *dwc)
4523{
4524 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
4525 int irq;
4526
4527 irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
4528 if (irq > 0)
4529 goto out;
4530
4531 if (irq == -EPROBE_DEFER)
4532 goto out;
4533
4534 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
4535 if (irq > 0)
4536 goto out;
4537
4538 if (irq == -EPROBE_DEFER)
4539 goto out;
4540
4541 irq = platform_get_irq(dwc3_pdev, 0);
4542
4543out:
4544 return irq;
4545}
4546
4547static void dwc_gadget_release(struct device *dev)
4548{
4549 struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
4550
4551 kfree(gadget);
4552}
4553
4554/**
4555 * dwc3_gadget_init - initializes gadget related registers
4556 * @dwc: pointer to our controller context structure
4557 *
4558 * Returns 0 on success otherwise negative errno.
4559 */
4560int dwc3_gadget_init(struct dwc3 *dwc)
4561{
4562 int ret;
4563 int irq;
4564 struct device *dev;
4565
4566 irq = dwc3_gadget_get_irq(dwc);
4567 if (irq < 0) {
4568 ret = irq;
4569 goto err0;
4570 }
4571
4572 dwc->irq_gadget = irq;
4573
4574 dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
4575 sizeof(*dwc->ep0_trb) * 2,
4576 &dwc->ep0_trb_addr, GFP_KERNEL);
4577 if (!dwc->ep0_trb) {
4578 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
4579 ret = -ENOMEM;
4580 goto err0;
4581 }
4582
4583 dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
4584 if (!dwc->setup_buf) {
4585 ret = -ENOMEM;
4586 goto err1;
4587 }
4588
4589 dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
4590 &dwc->bounce_addr, GFP_KERNEL);
4591 if (!dwc->bounce) {
4592 ret = -ENOMEM;
4593 goto err2;
4594 }
4595
4596 init_completion(&dwc->ep0_in_setup);
4597 dwc->gadget = kzalloc(sizeof(struct usb_gadget), GFP_KERNEL);
4598 if (!dwc->gadget) {
4599 ret = -ENOMEM;
4600 goto err3;
4601 }
4602
4603
4604 usb_initialize_gadget(dwc->dev, dwc->gadget, dwc_gadget_release);
4605 dev = &dwc->gadget->dev;
4606 dev->platform_data = dwc;
4607 dwc->gadget->ops = &dwc3_gadget_ops;
4608 dwc->gadget->speed = USB_SPEED_UNKNOWN;
4609 dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;
4610 dwc->gadget->sg_supported = true;
4611 dwc->gadget->name = "dwc3-gadget";
4612 dwc->gadget->lpm_capable = !dwc->usb2_gadget_lpm_disable;
4613 dwc->gadget->wakeup_capable = true;
4614
4615 /*
4616 * FIXME We might be setting max_speed to <SUPER, however versions
4617 * <2.20a of dwc3 have an issue with metastability (documented
4618 * elsewhere in this driver) which tells us we can't set max speed to
4619 * anything lower than SUPER.
4620 *
4621 * Because gadget.max_speed is only used by composite.c and function
4622 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
4623 * to happen so we avoid sending SuperSpeed Capability descriptor
4624 * together with our BOS descriptor as that could confuse host into
4625 * thinking we can handle super speed.
4626 *
4627 * Note that, in fact, we won't even support GetBOS requests when speed
4628 * is less than super speed because we don't have means, yet, to tell
4629 * composite.c that we are USB 2.0 + LPM ECN.
4630 */
4631 if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
4632 !dwc->dis_metastability_quirk)
4633 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
4634 dwc->revision);
4635
4636 dwc->gadget->max_speed = dwc->maximum_speed;
4637 dwc->gadget->max_ssp_rate = dwc->max_ssp_rate;
4638
4639 /*
4640 * REVISIT: Here we should clear all pending IRQs to be
4641 * sure we're starting from a well known location.
4642 */
4643
4644 ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
4645 if (ret)
4646 goto err4;
4647
4648 ret = usb_add_gadget(dwc->gadget);
4649 if (ret) {
4650 dev_err(dwc->dev, "failed to add gadget\n");
4651 goto err5;
4652 }
4653
4654 if (DWC3_IP_IS(DWC32) && dwc->maximum_speed == USB_SPEED_SUPER_PLUS)
4655 dwc3_gadget_set_ssp_rate(dwc->gadget, dwc->max_ssp_rate);
4656 else
4657 dwc3_gadget_set_speed(dwc->gadget, dwc->maximum_speed);
4658
4659 /* No system wakeup if no gadget driver bound */
4660 if (dwc->sys_wakeup)
4661 device_wakeup_disable(dwc->sysdev);
4662
4663 return 0;
4664
4665err5:
4666 dwc3_gadget_free_endpoints(dwc);
4667err4:
4668 usb_put_gadget(dwc->gadget);
4669 dwc->gadget = NULL;
4670err3:
4671 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
4672 dwc->bounce_addr);
4673
4674err2:
4675 kfree(dwc->setup_buf);
4676
4677err1:
4678 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
4679 dwc->ep0_trb, dwc->ep0_trb_addr);
4680
4681err0:
4682 return ret;
4683}
4684
4685/* -------------------------------------------------------------------------- */
4686
4687void dwc3_gadget_exit(struct dwc3 *dwc)
4688{
4689 if (!dwc->gadget)
4690 return;
4691
4692 dwc3_enable_susphy(dwc, false);
4693 usb_del_gadget(dwc->gadget);
4694 dwc3_gadget_free_endpoints(dwc);
4695 usb_put_gadget(dwc->gadget);
4696 dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
4697 dwc->bounce_addr);
4698 kfree(dwc->setup_buf);
4699 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
4700 dwc->ep0_trb, dwc->ep0_trb_addr);
4701}
4702
4703int dwc3_gadget_suspend(struct dwc3 *dwc)
4704{
4705 unsigned long flags;
4706 int ret;
4707
4708 ret = dwc3_gadget_soft_disconnect(dwc);
4709 if (ret)
4710 goto err;
4711
4712 spin_lock_irqsave(&dwc->lock, flags);
4713 if (dwc->gadget_driver)
4714 dwc3_disconnect_gadget(dwc);
4715 spin_unlock_irqrestore(&dwc->lock, flags);
4716
4717 return 0;
4718
4719err:
4720 /*
4721 * Attempt to reset the controller's state. Likely no
4722 * communication can be established until the host
4723 * performs a port reset.
4724 */
4725 if (dwc->softconnect)
4726 dwc3_gadget_soft_connect(dwc);
4727
4728 return ret;
4729}
4730
4731int dwc3_gadget_resume(struct dwc3 *dwc)
4732{
4733 if (!dwc->gadget_driver || !dwc->softconnect)
4734 return 0;
4735
4736 return dwc3_gadget_soft_connect(dwc);
4737}
4738
4739void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
4740{
4741 if (dwc->pending_events) {
4742 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
4743 dwc3_thread_interrupt(dwc->irq_gadget, dwc->ev_buf);
4744 pm_runtime_put(dwc->dev);
4745 dwc->pending_events = false;
4746 enable_irq(dwc->irq_gadget);
4747 }
4748}
1/**
2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/kernel.h>
20#include <linux/delay.h>
21#include <linux/slab.h>
22#include <linux/spinlock.h>
23#include <linux/platform_device.h>
24#include <linux/pm_runtime.h>
25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/list.h>
28#include <linux/dma-mapping.h>
29
30#include <linux/usb/ch9.h>
31#include <linux/usb/gadget.h>
32
33#include "debug.h"
34#include "core.h"
35#include "gadget.h"
36#include "io.h"
37
38/**
39 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
40 * @dwc: pointer to our context structure
41 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
42 *
43 * Caller should take care of locking. This function will
44 * return 0 on success or -EINVAL if wrong Test Selector
45 * is passed
46 */
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
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
87/**
88 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
89 * @dwc: pointer to our context structure
90 * @state: the state to put link into
91 *
92 * Caller should take care of locking. This function will
93 * return 0 on success or -ETIMEDOUT.
94 */
95int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
96{
97 int retries = 10000;
98 u32 reg;
99
100 /*
101 * Wait until device controller is ready. Only applies to 1.94a and
102 * later RTL.
103 */
104 if (dwc->revision >= DWC3_REVISION_194A) {
105 while (--retries) {
106 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
107 if (reg & DWC3_DSTS_DCNRD)
108 udelay(5);
109 else
110 break;
111 }
112
113 if (retries <= 0)
114 return -ETIMEDOUT;
115 }
116
117 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
118 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
119
120 /* set requested state */
121 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
122 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
123
124 /*
125 * The following code is racy when called from dwc3_gadget_wakeup,
126 * and is not needed, at least on newer versions
127 */
128 if (dwc->revision >= DWC3_REVISION_194A)
129 return 0;
130
131 /* wait for a change in DSTS */
132 retries = 10000;
133 while (--retries) {
134 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
135
136 if (DWC3_DSTS_USBLNKST(reg) == state)
137 return 0;
138
139 udelay(5);
140 }
141
142 return -ETIMEDOUT;
143}
144
145/**
146 * dwc3_ep_inc_trb() - Increment a TRB index.
147 * @index - Pointer to the TRB index to increment.
148 *
149 * The index should never point to the link TRB. After incrementing,
150 * if it is point to the link TRB, wrap around to the beginning. The
151 * link TRB is always at the last TRB entry.
152 */
153static void dwc3_ep_inc_trb(u8 *index)
154{
155 (*index)++;
156 if (*index == (DWC3_TRB_NUM - 1))
157 *index = 0;
158}
159
160static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
161{
162 dwc3_ep_inc_trb(&dep->trb_enqueue);
163}
164
165static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
166{
167 dwc3_ep_inc_trb(&dep->trb_dequeue);
168}
169
170void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
171 int status)
172{
173 struct dwc3 *dwc = dep->dwc;
174 unsigned int unmap_after_complete = false;
175
176 req->started = false;
177 list_del(&req->list);
178 req->trb = NULL;
179 req->remaining = 0;
180
181 if (req->request.status == -EINPROGRESS)
182 req->request.status = status;
183
184 /*
185 * NOTICE we don't want to unmap before calling ->complete() if we're
186 * dealing with a bounced ep0 request. If we unmap it here, we would end
187 * up overwritting the contents of req->buf and this could confuse the
188 * gadget driver.
189 */
190 if (dwc->ep0_bounced && dep->number <= 1) {
191 dwc->ep0_bounced = false;
192 unmap_after_complete = true;
193 } else {
194 usb_gadget_unmap_request_by_dev(dwc->sysdev,
195 &req->request, req->direction);
196 }
197
198 trace_dwc3_gadget_giveback(req);
199
200 spin_unlock(&dwc->lock);
201 usb_gadget_giveback_request(&dep->endpoint, &req->request);
202 spin_lock(&dwc->lock);
203
204 if (unmap_after_complete)
205 usb_gadget_unmap_request_by_dev(dwc->sysdev,
206 &req->request, req->direction);
207
208 if (dep->number > 1)
209 pm_runtime_put(dwc->dev);
210}
211
212int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
213{
214 u32 timeout = 500;
215 int status = 0;
216 int ret = 0;
217 u32 reg;
218
219 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
220 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
221
222 do {
223 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
224 if (!(reg & DWC3_DGCMD_CMDACT)) {
225 status = DWC3_DGCMD_STATUS(reg);
226 if (status)
227 ret = -EINVAL;
228 break;
229 }
230 } while (--timeout);
231
232 if (!timeout) {
233 ret = -ETIMEDOUT;
234 status = -ETIMEDOUT;
235 }
236
237 trace_dwc3_gadget_generic_cmd(cmd, param, status);
238
239 return ret;
240}
241
242static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
243
244int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
245 struct dwc3_gadget_ep_cmd_params *params)
246{
247 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
248 struct dwc3 *dwc = dep->dwc;
249 u32 timeout = 500;
250 u32 reg;
251
252 int cmd_status = 0;
253 int susphy = false;
254 int ret = -EINVAL;
255
256 /*
257 * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
258 * we're issuing an endpoint command, we must check if
259 * GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it.
260 *
261 * We will also set SUSPHY bit to what it was before returning as stated
262 * by the same section on Synopsys databook.
263 */
264 if (dwc->gadget.speed <= USB_SPEED_HIGH) {
265 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
266 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
267 susphy = true;
268 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
269 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
270 }
271 }
272
273 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
274 int needs_wakeup;
275
276 needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
277 dwc->link_state == DWC3_LINK_STATE_U2 ||
278 dwc->link_state == DWC3_LINK_STATE_U3);
279
280 if (unlikely(needs_wakeup)) {
281 ret = __dwc3_gadget_wakeup(dwc);
282 dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
283 ret);
284 }
285 }
286
287 dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
288 dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
289 dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
290
291 /*
292 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
293 * not relying on XferNotReady, we can make use of a special "No
294 * Response Update Transfer" command where we should clear both CmdAct
295 * and CmdIOC bits.
296 *
297 * With this, we don't need to wait for command completion and can
298 * straight away issue further commands to the endpoint.
299 *
300 * NOTICE: We're making an assumption that control endpoints will never
301 * make use of Update Transfer command. This is a safe assumption
302 * because we can never have more than one request at a time with
303 * Control Endpoints. If anybody changes that assumption, this chunk
304 * needs to be updated accordingly.
305 */
306 if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
307 !usb_endpoint_xfer_isoc(desc))
308 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
309 else
310 cmd |= DWC3_DEPCMD_CMDACT;
311
312 dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
313 do {
314 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
315 if (!(reg & DWC3_DEPCMD_CMDACT)) {
316 cmd_status = DWC3_DEPCMD_STATUS(reg);
317
318 switch (cmd_status) {
319 case 0:
320 ret = 0;
321 break;
322 case DEPEVT_TRANSFER_NO_RESOURCE:
323 ret = -EINVAL;
324 break;
325 case DEPEVT_TRANSFER_BUS_EXPIRY:
326 /*
327 * SW issues START TRANSFER command to
328 * isochronous ep with future frame interval. If
329 * future interval time has already passed when
330 * core receives the command, it will respond
331 * with an error status of 'Bus Expiry'.
332 *
333 * Instead of always returning -EINVAL, let's
334 * give a hint to the gadget driver that this is
335 * the case by returning -EAGAIN.
336 */
337 ret = -EAGAIN;
338 break;
339 default:
340 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
341 }
342
343 break;
344 }
345 } while (--timeout);
346
347 if (timeout == 0) {
348 ret = -ETIMEDOUT;
349 cmd_status = -ETIMEDOUT;
350 }
351
352 trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
353
354 if (ret == 0) {
355 switch (DWC3_DEPCMD_CMD(cmd)) {
356 case DWC3_DEPCMD_STARTTRANSFER:
357 dep->flags |= DWC3_EP_TRANSFER_STARTED;
358 break;
359 case DWC3_DEPCMD_ENDTRANSFER:
360 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
361 break;
362 default:
363 /* nothing */
364 break;
365 }
366 }
367
368 if (unlikely(susphy)) {
369 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
370 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
371 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
372 }
373
374 return ret;
375}
376
377static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
378{
379 struct dwc3 *dwc = dep->dwc;
380 struct dwc3_gadget_ep_cmd_params params;
381 u32 cmd = DWC3_DEPCMD_CLEARSTALL;
382
383 /*
384 * As of core revision 2.60a the recommended programming model
385 * is to set the ClearPendIN bit when issuing a Clear Stall EP
386 * command for IN endpoints. This is to prevent an issue where
387 * some (non-compliant) hosts may not send ACK TPs for pending
388 * IN transfers due to a mishandled error condition. Synopsys
389 * STAR 9000614252.
390 */
391 if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
392 (dwc->gadget.speed >= USB_SPEED_SUPER))
393 cmd |= DWC3_DEPCMD_CLEARPENDIN;
394
395 memset(¶ms, 0, sizeof(params));
396
397 return dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
398}
399
400static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
401 struct dwc3_trb *trb)
402{
403 u32 offset = (char *) trb - (char *) dep->trb_pool;
404
405 return dep->trb_pool_dma + offset;
406}
407
408static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
409{
410 struct dwc3 *dwc = dep->dwc;
411
412 if (dep->trb_pool)
413 return 0;
414
415 dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
416 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
417 &dep->trb_pool_dma, GFP_KERNEL);
418 if (!dep->trb_pool) {
419 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
420 dep->name);
421 return -ENOMEM;
422 }
423
424 return 0;
425}
426
427static void dwc3_free_trb_pool(struct dwc3_ep *dep)
428{
429 struct dwc3 *dwc = dep->dwc;
430
431 dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
432 dep->trb_pool, dep->trb_pool_dma);
433
434 dep->trb_pool = NULL;
435 dep->trb_pool_dma = 0;
436}
437
438static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
439
440/**
441 * dwc3_gadget_start_config - Configure EP resources
442 * @dwc: pointer to our controller context structure
443 * @dep: endpoint that is being enabled
444 *
445 * The assignment of transfer resources cannot perfectly follow the
446 * data book due to the fact that the controller driver does not have
447 * all knowledge of the configuration in advance. It is given this
448 * information piecemeal by the composite gadget framework after every
449 * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
450 * programming model in this scenario can cause errors. For two
451 * reasons:
452 *
453 * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
454 * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
455 * multiple interfaces.
456 *
457 * 2) The databook does not mention doing more DEPXFERCFG for new
458 * endpoint on alt setting (8.1.6).
459 *
460 * The following simplified method is used instead:
461 *
462 * All hardware endpoints can be assigned a transfer resource and this
463 * setting will stay persistent until either a core reset or
464 * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
465 * do DEPXFERCFG for every hardware endpoint as well. We are
466 * guaranteed that there are as many transfer resources as endpoints.
467 *
468 * This function is called for each endpoint when it is being enabled
469 * but is triggered only when called for EP0-out, which always happens
470 * first, and which should only happen in one of the above conditions.
471 */
472static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
473{
474 struct dwc3_gadget_ep_cmd_params params;
475 u32 cmd;
476 int i;
477 int ret;
478
479 if (dep->number)
480 return 0;
481
482 memset(¶ms, 0x00, sizeof(params));
483 cmd = DWC3_DEPCMD_DEPSTARTCFG;
484
485 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
486 if (ret)
487 return ret;
488
489 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
490 struct dwc3_ep *dep = dwc->eps[i];
491
492 if (!dep)
493 continue;
494
495 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
496 if (ret)
497 return ret;
498 }
499
500 return 0;
501}
502
503static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
504 bool modify, bool restore)
505{
506 const struct usb_ss_ep_comp_descriptor *comp_desc;
507 const struct usb_endpoint_descriptor *desc;
508 struct dwc3_gadget_ep_cmd_params params;
509
510 if (dev_WARN_ONCE(dwc->dev, modify && restore,
511 "Can't modify and restore\n"))
512 return -EINVAL;
513
514 comp_desc = dep->endpoint.comp_desc;
515 desc = dep->endpoint.desc;
516
517 memset(¶ms, 0x00, sizeof(params));
518
519 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
520 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
521
522 /* Burst size is only needed in SuperSpeed mode */
523 if (dwc->gadget.speed >= USB_SPEED_SUPER) {
524 u32 burst = dep->endpoint.maxburst;
525 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
526 }
527
528 if (modify) {
529 params.param0 |= DWC3_DEPCFG_ACTION_MODIFY;
530 } else if (restore) {
531 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
532 params.param2 |= dep->saved_state;
533 } else {
534 params.param0 |= DWC3_DEPCFG_ACTION_INIT;
535 }
536
537 if (usb_endpoint_xfer_control(desc))
538 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
539
540 if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
541 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
542
543 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
544 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
545 | DWC3_DEPCFG_STREAM_EVENT_EN;
546 dep->stream_capable = true;
547 }
548
549 if (!usb_endpoint_xfer_control(desc))
550 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
551
552 /*
553 * We are doing 1:1 mapping for endpoints, meaning
554 * Physical Endpoints 2 maps to Logical Endpoint 2 and
555 * so on. We consider the direction bit as part of the physical
556 * endpoint number. So USB endpoint 0x81 is 0x03.
557 */
558 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
559
560 /*
561 * We must use the lower 16 TX FIFOs even though
562 * HW might have more
563 */
564 if (dep->direction)
565 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
566
567 if (desc->bInterval) {
568 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
569 dep->interval = 1 << (desc->bInterval - 1);
570 }
571
572 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, ¶ms);
573}
574
575static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
576{
577 struct dwc3_gadget_ep_cmd_params params;
578
579 memset(¶ms, 0x00, sizeof(params));
580
581 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
582
583 return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
584 ¶ms);
585}
586
587/**
588 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
589 * @dep: endpoint to be initialized
590 * @desc: USB Endpoint Descriptor
591 *
592 * Caller should take care of locking
593 */
594static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
595 bool modify, bool restore)
596{
597 const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
598 struct dwc3 *dwc = dep->dwc;
599
600 u32 reg;
601 int ret;
602
603 if (!(dep->flags & DWC3_EP_ENABLED)) {
604 ret = dwc3_gadget_start_config(dwc, dep);
605 if (ret)
606 return ret;
607 }
608
609 ret = dwc3_gadget_set_ep_config(dwc, dep, modify, restore);
610 if (ret)
611 return ret;
612
613 if (!(dep->flags & DWC3_EP_ENABLED)) {
614 struct dwc3_trb *trb_st_hw;
615 struct dwc3_trb *trb_link;
616
617 dep->type = usb_endpoint_type(desc);
618 dep->flags |= DWC3_EP_ENABLED;
619 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
620
621 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
622 reg |= DWC3_DALEPENA_EP(dep->number);
623 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
624
625 init_waitqueue_head(&dep->wait_end_transfer);
626
627 if (usb_endpoint_xfer_control(desc))
628 goto out;
629
630 /* Initialize the TRB ring */
631 dep->trb_dequeue = 0;
632 dep->trb_enqueue = 0;
633 memset(dep->trb_pool, 0,
634 sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
635
636 /* Link TRB. The HWO bit is never reset */
637 trb_st_hw = &dep->trb_pool[0];
638
639 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
640 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
641 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
642 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
643 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
644 }
645
646 /*
647 * Issue StartTransfer here with no-op TRB so we can always rely on No
648 * Response Update Transfer command.
649 */
650 if (usb_endpoint_xfer_bulk(desc)) {
651 struct dwc3_gadget_ep_cmd_params params;
652 struct dwc3_trb *trb;
653 dma_addr_t trb_dma;
654 u32 cmd;
655
656 memset(¶ms, 0, sizeof(params));
657 trb = &dep->trb_pool[0];
658 trb_dma = dwc3_trb_dma_offset(dep, trb);
659
660 params.param0 = upper_32_bits(trb_dma);
661 params.param1 = lower_32_bits(trb_dma);
662
663 cmd = DWC3_DEPCMD_STARTTRANSFER;
664
665 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
666 if (ret < 0)
667 return ret;
668
669 dep->flags |= DWC3_EP_BUSY;
670
671 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
672 WARN_ON_ONCE(!dep->resource_index);
673 }
674
675
676out:
677 trace_dwc3_gadget_ep_enable(dep);
678
679 return 0;
680}
681
682static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
683static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
684{
685 struct dwc3_request *req;
686
687 dwc3_stop_active_transfer(dwc, dep->number, true);
688
689 /* - giveback all requests to gadget driver */
690 while (!list_empty(&dep->started_list)) {
691 req = next_request(&dep->started_list);
692
693 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
694 }
695
696 while (!list_empty(&dep->pending_list)) {
697 req = next_request(&dep->pending_list);
698
699 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
700 }
701}
702
703/**
704 * __dwc3_gadget_ep_disable - Disables a HW endpoint
705 * @dep: the endpoint to disable
706 *
707 * This function also removes requests which are currently processed ny the
708 * hardware and those which are not yet scheduled.
709 * Caller should take care of locking.
710 */
711static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
712{
713 struct dwc3 *dwc = dep->dwc;
714 u32 reg;
715
716 trace_dwc3_gadget_ep_disable(dep);
717
718 dwc3_remove_requests(dwc, dep);
719
720 /* make sure HW endpoint isn't stalled */
721 if (dep->flags & DWC3_EP_STALL)
722 __dwc3_gadget_ep_set_halt(dep, 0, false);
723
724 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
725 reg &= ~DWC3_DALEPENA_EP(dep->number);
726 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
727
728 dep->stream_capable = false;
729 dep->type = 0;
730 dep->flags &= DWC3_EP_END_TRANSFER_PENDING;
731
732 /* Clear out the ep descriptors for non-ep0 */
733 if (dep->number > 1) {
734 dep->endpoint.comp_desc = NULL;
735 dep->endpoint.desc = NULL;
736 }
737
738 return 0;
739}
740
741/* -------------------------------------------------------------------------- */
742
743static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
744 const struct usb_endpoint_descriptor *desc)
745{
746 return -EINVAL;
747}
748
749static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
750{
751 return -EINVAL;
752}
753
754/* -------------------------------------------------------------------------- */
755
756static int dwc3_gadget_ep_enable(struct usb_ep *ep,
757 const struct usb_endpoint_descriptor *desc)
758{
759 struct dwc3_ep *dep;
760 struct dwc3 *dwc;
761 unsigned long flags;
762 int ret;
763
764 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
765 pr_debug("dwc3: invalid parameters\n");
766 return -EINVAL;
767 }
768
769 if (!desc->wMaxPacketSize) {
770 pr_debug("dwc3: missing wMaxPacketSize\n");
771 return -EINVAL;
772 }
773
774 dep = to_dwc3_ep(ep);
775 dwc = dep->dwc;
776
777 if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
778 "%s is already enabled\n",
779 dep->name))
780 return 0;
781
782 spin_lock_irqsave(&dwc->lock, flags);
783 ret = __dwc3_gadget_ep_enable(dep, false, false);
784 spin_unlock_irqrestore(&dwc->lock, flags);
785
786 return ret;
787}
788
789static int dwc3_gadget_ep_disable(struct usb_ep *ep)
790{
791 struct dwc3_ep *dep;
792 struct dwc3 *dwc;
793 unsigned long flags;
794 int ret;
795
796 if (!ep) {
797 pr_debug("dwc3: invalid parameters\n");
798 return -EINVAL;
799 }
800
801 dep = to_dwc3_ep(ep);
802 dwc = dep->dwc;
803
804 if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
805 "%s is already disabled\n",
806 dep->name))
807 return 0;
808
809 spin_lock_irqsave(&dwc->lock, flags);
810 ret = __dwc3_gadget_ep_disable(dep);
811 spin_unlock_irqrestore(&dwc->lock, flags);
812
813 return ret;
814}
815
816static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
817 gfp_t gfp_flags)
818{
819 struct dwc3_request *req;
820 struct dwc3_ep *dep = to_dwc3_ep(ep);
821
822 req = kzalloc(sizeof(*req), gfp_flags);
823 if (!req)
824 return NULL;
825
826 req->epnum = dep->number;
827 req->dep = dep;
828
829 dep->allocated_requests++;
830
831 trace_dwc3_alloc_request(req);
832
833 return &req->request;
834}
835
836static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
837 struct usb_request *request)
838{
839 struct dwc3_request *req = to_dwc3_request(request);
840 struct dwc3_ep *dep = to_dwc3_ep(ep);
841
842 dep->allocated_requests--;
843 trace_dwc3_free_request(req);
844 kfree(req);
845}
846
847static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep);
848
849/**
850 * dwc3_prepare_one_trb - setup one TRB from one request
851 * @dep: endpoint for which this request is prepared
852 * @req: dwc3_request pointer
853 */
854static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
855 struct dwc3_request *req, dma_addr_t dma,
856 unsigned length, unsigned chain, unsigned node)
857{
858 struct dwc3_trb *trb;
859 struct dwc3 *dwc = dep->dwc;
860 struct usb_gadget *gadget = &dwc->gadget;
861 enum usb_device_speed speed = gadget->speed;
862
863 trb = &dep->trb_pool[dep->trb_enqueue];
864
865 if (!req->trb) {
866 dwc3_gadget_move_started_request(req);
867 req->trb = trb;
868 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
869 dep->queued_requests++;
870 }
871
872 dwc3_ep_inc_enq(dep);
873
874 trb->size = DWC3_TRB_SIZE_LENGTH(length);
875 trb->bpl = lower_32_bits(dma);
876 trb->bph = upper_32_bits(dma);
877
878 switch (usb_endpoint_type(dep->endpoint.desc)) {
879 case USB_ENDPOINT_XFER_CONTROL:
880 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
881 break;
882
883 case USB_ENDPOINT_XFER_ISOC:
884 if (!node) {
885 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
886
887 if (speed == USB_SPEED_HIGH) {
888 struct usb_ep *ep = &dep->endpoint;
889 trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
890 }
891 } else {
892 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
893 }
894
895 /* always enable Interrupt on Missed ISOC */
896 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
897 break;
898
899 case USB_ENDPOINT_XFER_BULK:
900 case USB_ENDPOINT_XFER_INT:
901 trb->ctrl = DWC3_TRBCTL_NORMAL;
902 break;
903 default:
904 /*
905 * This is only possible with faulty memory because we
906 * checked it already :)
907 */
908 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
909 usb_endpoint_type(dep->endpoint.desc));
910 }
911
912 /* always enable Continue on Short Packet */
913 if (usb_endpoint_dir_out(dep->endpoint.desc)) {
914 trb->ctrl |= DWC3_TRB_CTRL_CSP;
915
916 if (req->request.short_not_ok)
917 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
918 }
919
920 if ((!req->request.no_interrupt && !chain) ||
921 (dwc3_calc_trbs_left(dep) == 0))
922 trb->ctrl |= DWC3_TRB_CTRL_IOC;
923
924 if (chain)
925 trb->ctrl |= DWC3_TRB_CTRL_CHN;
926
927 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
928 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
929
930 trb->ctrl |= DWC3_TRB_CTRL_HWO;
931
932 trace_dwc3_prepare_trb(dep, trb);
933}
934
935/**
936 * dwc3_ep_prev_trb() - Returns the previous TRB in the ring
937 * @dep: The endpoint with the TRB ring
938 * @index: The index of the current TRB in the ring
939 *
940 * Returns the TRB prior to the one pointed to by the index. If the
941 * index is 0, we will wrap backwards, skip the link TRB, and return
942 * the one just before that.
943 */
944static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
945{
946 u8 tmp = index;
947
948 if (!tmp)
949 tmp = DWC3_TRB_NUM - 1;
950
951 return &dep->trb_pool[tmp - 1];
952}
953
954static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
955{
956 struct dwc3_trb *tmp;
957 struct dwc3 *dwc = dep->dwc;
958 u8 trbs_left;
959
960 /*
961 * If enqueue & dequeue are equal than it is either full or empty.
962 *
963 * One way to know for sure is if the TRB right before us has HWO bit
964 * set or not. If it has, then we're definitely full and can't fit any
965 * more transfers in our ring.
966 */
967 if (dep->trb_enqueue == dep->trb_dequeue) {
968 tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
969 if (dev_WARN_ONCE(dwc->dev, tmp->ctrl & DWC3_TRB_CTRL_HWO,
970 "%s No TRBS left\n", dep->name))
971 return 0;
972
973 return DWC3_TRB_NUM - 1;
974 }
975
976 trbs_left = dep->trb_dequeue - dep->trb_enqueue;
977 trbs_left &= (DWC3_TRB_NUM - 1);
978
979 if (dep->trb_dequeue < dep->trb_enqueue)
980 trbs_left--;
981
982 return trbs_left;
983}
984
985static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
986 struct dwc3_request *req)
987{
988 struct scatterlist *sg = req->sg;
989 struct scatterlist *s;
990 unsigned int length;
991 dma_addr_t dma;
992 int i;
993
994 for_each_sg(sg, s, req->num_pending_sgs, i) {
995 unsigned chain = true;
996
997 length = sg_dma_len(s);
998 dma = sg_dma_address(s);
999
1000 if (sg_is_last(s))
1001 chain = false;
1002
1003 dwc3_prepare_one_trb(dep, req, dma, length,
1004 chain, i);
1005
1006 if (!dwc3_calc_trbs_left(dep))
1007 break;
1008 }
1009}
1010
1011static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
1012 struct dwc3_request *req)
1013{
1014 unsigned int length;
1015 dma_addr_t dma;
1016
1017 dma = req->request.dma;
1018 length = req->request.length;
1019
1020 dwc3_prepare_one_trb(dep, req, dma, length,
1021 false, 0);
1022}
1023
1024/*
1025 * dwc3_prepare_trbs - setup TRBs from requests
1026 * @dep: endpoint for which requests are being prepared
1027 *
1028 * The function goes through the requests list and sets up TRBs for the
1029 * transfers. The function returns once there are no more TRBs available or
1030 * it runs out of requests.
1031 */
1032static void dwc3_prepare_trbs(struct dwc3_ep *dep)
1033{
1034 struct dwc3_request *req, *n;
1035
1036 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1037
1038 if (!dwc3_calc_trbs_left(dep))
1039 return;
1040
1041 /*
1042 * We can get in a situation where there's a request in the started list
1043 * but there weren't enough TRBs to fully kick it in the first time
1044 * around, so it has been waiting for more TRBs to be freed up.
1045 *
1046 * In that case, we should check if we have a request with pending_sgs
1047 * in the started list and prepare TRBs for that request first,
1048 * otherwise we will prepare TRBs completely out of order and that will
1049 * break things.
1050 */
1051 list_for_each_entry(req, &dep->started_list, list) {
1052 if (req->num_pending_sgs > 0)
1053 dwc3_prepare_one_trb_sg(dep, req);
1054
1055 if (!dwc3_calc_trbs_left(dep))
1056 return;
1057 }
1058
1059 list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1060 if (req->num_pending_sgs > 0)
1061 dwc3_prepare_one_trb_sg(dep, req);
1062 else
1063 dwc3_prepare_one_trb_linear(dep, req);
1064
1065 if (!dwc3_calc_trbs_left(dep))
1066 return;
1067 }
1068}
1069
1070static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
1071{
1072 struct dwc3_gadget_ep_cmd_params params;
1073 struct dwc3_request *req;
1074 int starting;
1075 int ret;
1076 u32 cmd;
1077
1078 starting = !(dep->flags & DWC3_EP_BUSY);
1079
1080 dwc3_prepare_trbs(dep);
1081 req = next_request(&dep->started_list);
1082 if (!req) {
1083 dep->flags |= DWC3_EP_PENDING_REQUEST;
1084 return 0;
1085 }
1086
1087 memset(¶ms, 0, sizeof(params));
1088
1089 if (starting) {
1090 params.param0 = upper_32_bits(req->trb_dma);
1091 params.param1 = lower_32_bits(req->trb_dma);
1092 cmd = DWC3_DEPCMD_STARTTRANSFER |
1093 DWC3_DEPCMD_PARAM(cmd_param);
1094 } else {
1095 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1096 DWC3_DEPCMD_PARAM(dep->resource_index);
1097 }
1098
1099 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1100 if (ret < 0) {
1101 /*
1102 * FIXME we need to iterate over the list of requests
1103 * here and stop, unmap, free and del each of the linked
1104 * requests instead of what we do now.
1105 */
1106 if (req->trb)
1107 memset(req->trb, 0, sizeof(struct dwc3_trb));
1108 dep->queued_requests--;
1109 dwc3_gadget_giveback(dep, req, ret);
1110 return ret;
1111 }
1112
1113 dep->flags |= DWC3_EP_BUSY;
1114
1115 if (starting) {
1116 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
1117 WARN_ON_ONCE(!dep->resource_index);
1118 }
1119
1120 return 0;
1121}
1122
1123static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1124{
1125 u32 reg;
1126
1127 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1128 return DWC3_DSTS_SOFFN(reg);
1129}
1130
1131static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1132 struct dwc3_ep *dep, u32 cur_uf)
1133{
1134 u32 uf;
1135
1136 if (list_empty(&dep->pending_list)) {
1137 dev_info(dwc->dev, "%s: ran out of requests\n",
1138 dep->name);
1139 dep->flags |= DWC3_EP_PENDING_REQUEST;
1140 return;
1141 }
1142
1143 /* 4 micro frames in the future */
1144 uf = cur_uf + dep->interval * 4;
1145
1146 __dwc3_gadget_kick_transfer(dep, uf);
1147}
1148
1149static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1150 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1151{
1152 u32 cur_uf, mask;
1153
1154 mask = ~(dep->interval - 1);
1155 cur_uf = event->parameters & mask;
1156
1157 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1158}
1159
1160static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1161{
1162 struct dwc3 *dwc = dep->dwc;
1163 int ret;
1164
1165 if (!dep->endpoint.desc) {
1166 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
1167 dep->name);
1168 return -ESHUTDOWN;
1169 }
1170
1171 if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1172 &req->request, req->dep->name)) {
1173 dev_err(dwc->dev, "%s: request %p belongs to '%s'\n",
1174 dep->name, &req->request, req->dep->name);
1175 return -EINVAL;
1176 }
1177
1178 pm_runtime_get(dwc->dev);
1179
1180 req->request.actual = 0;
1181 req->request.status = -EINPROGRESS;
1182 req->direction = dep->direction;
1183 req->epnum = dep->number;
1184
1185 trace_dwc3_ep_queue(req);
1186
1187 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1188 dep->direction);
1189 if (ret)
1190 return ret;
1191
1192 req->sg = req->request.sg;
1193 req->num_pending_sgs = req->request.num_mapped_sgs;
1194
1195 list_add_tail(&req->list, &dep->pending_list);
1196
1197 /*
1198 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1199 * wait for a XferNotReady event so we will know what's the current
1200 * (micro-)frame number.
1201 *
1202 * Without this trick, we are very, very likely gonna get Bus Expiry
1203 * errors which will force us issue EndTransfer command.
1204 */
1205 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1206 if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
1207 if (dep->flags & DWC3_EP_TRANSFER_STARTED) {
1208 dwc3_stop_active_transfer(dwc, dep->number, true);
1209 dep->flags = DWC3_EP_ENABLED;
1210 } else {
1211 u32 cur_uf;
1212
1213 cur_uf = __dwc3_gadget_get_frame(dwc);
1214 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1215 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
1216 }
1217 }
1218 return 0;
1219 }
1220
1221 if (!dwc3_calc_trbs_left(dep))
1222 return 0;
1223
1224 ret = __dwc3_gadget_kick_transfer(dep, 0);
1225 if (ret == -EBUSY)
1226 ret = 0;
1227
1228 return ret;
1229}
1230
1231static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep,
1232 struct usb_request *request)
1233{
1234 dwc3_gadget_ep_free_request(ep, request);
1235}
1236
1237static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep)
1238{
1239 struct dwc3_request *req;
1240 struct usb_request *request;
1241 struct usb_ep *ep = &dep->endpoint;
1242
1243 request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
1244 if (!request)
1245 return -ENOMEM;
1246
1247 request->length = 0;
1248 request->buf = dwc->zlp_buf;
1249 request->complete = __dwc3_gadget_ep_zlp_complete;
1250
1251 req = to_dwc3_request(request);
1252
1253 return __dwc3_gadget_ep_queue(dep, req);
1254}
1255
1256static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1257 gfp_t gfp_flags)
1258{
1259 struct dwc3_request *req = to_dwc3_request(request);
1260 struct dwc3_ep *dep = to_dwc3_ep(ep);
1261 struct dwc3 *dwc = dep->dwc;
1262
1263 unsigned long flags;
1264
1265 int ret;
1266
1267 spin_lock_irqsave(&dwc->lock, flags);
1268 ret = __dwc3_gadget_ep_queue(dep, req);
1269
1270 /*
1271 * Okay, here's the thing, if gadget driver has requested for a ZLP by
1272 * setting request->zero, instead of doing magic, we will just queue an
1273 * extra usb_request ourselves so that it gets handled the same way as
1274 * any other request.
1275 */
1276 if (ret == 0 && request->zero && request->length &&
1277 (request->length % ep->maxpacket == 0))
1278 ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
1279
1280 spin_unlock_irqrestore(&dwc->lock, flags);
1281
1282 return ret;
1283}
1284
1285static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1286 struct usb_request *request)
1287{
1288 struct dwc3_request *req = to_dwc3_request(request);
1289 struct dwc3_request *r = NULL;
1290
1291 struct dwc3_ep *dep = to_dwc3_ep(ep);
1292 struct dwc3 *dwc = dep->dwc;
1293
1294 unsigned long flags;
1295 int ret = 0;
1296
1297 trace_dwc3_ep_dequeue(req);
1298
1299 spin_lock_irqsave(&dwc->lock, flags);
1300
1301 list_for_each_entry(r, &dep->pending_list, list) {
1302 if (r == req)
1303 break;
1304 }
1305
1306 if (r != req) {
1307 list_for_each_entry(r, &dep->started_list, list) {
1308 if (r == req)
1309 break;
1310 }
1311 if (r == req) {
1312 /* wait until it is processed */
1313 dwc3_stop_active_transfer(dwc, dep->number, true);
1314 goto out1;
1315 }
1316 dev_err(dwc->dev, "request %p was not queued to %s\n",
1317 request, ep->name);
1318 ret = -EINVAL;
1319 goto out0;
1320 }
1321
1322out1:
1323 /* giveback the request */
1324 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1325
1326out0:
1327 spin_unlock_irqrestore(&dwc->lock, flags);
1328
1329 return ret;
1330}
1331
1332int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1333{
1334 struct dwc3_gadget_ep_cmd_params params;
1335 struct dwc3 *dwc = dep->dwc;
1336 int ret;
1337
1338 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1339 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1340 return -EINVAL;
1341 }
1342
1343 memset(¶ms, 0x00, sizeof(params));
1344
1345 if (value) {
1346 struct dwc3_trb *trb;
1347
1348 unsigned transfer_in_flight;
1349 unsigned started;
1350
1351 if (dep->flags & DWC3_EP_STALL)
1352 return 0;
1353
1354 if (dep->number > 1)
1355 trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
1356 else
1357 trb = &dwc->ep0_trb[dep->trb_enqueue];
1358
1359 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
1360 started = !list_empty(&dep->started_list);
1361
1362 if (!protocol && ((dep->direction && transfer_in_flight) ||
1363 (!dep->direction && started))) {
1364 return -EAGAIN;
1365 }
1366
1367 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
1368 ¶ms);
1369 if (ret)
1370 dev_err(dwc->dev, "failed to set STALL on %s\n",
1371 dep->name);
1372 else
1373 dep->flags |= DWC3_EP_STALL;
1374 } else {
1375 if (!(dep->flags & DWC3_EP_STALL))
1376 return 0;
1377
1378 ret = dwc3_send_clear_stall_ep_cmd(dep);
1379 if (ret)
1380 dev_err(dwc->dev, "failed to clear STALL on %s\n",
1381 dep->name);
1382 else
1383 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1384 }
1385
1386 return ret;
1387}
1388
1389static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1390{
1391 struct dwc3_ep *dep = to_dwc3_ep(ep);
1392 struct dwc3 *dwc = dep->dwc;
1393
1394 unsigned long flags;
1395
1396 int ret;
1397
1398 spin_lock_irqsave(&dwc->lock, flags);
1399 ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1400 spin_unlock_irqrestore(&dwc->lock, flags);
1401
1402 return ret;
1403}
1404
1405static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1406{
1407 struct dwc3_ep *dep = to_dwc3_ep(ep);
1408 struct dwc3 *dwc = dep->dwc;
1409 unsigned long flags;
1410 int ret;
1411
1412 spin_lock_irqsave(&dwc->lock, flags);
1413 dep->flags |= DWC3_EP_WEDGE;
1414
1415 if (dep->number == 0 || dep->number == 1)
1416 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1417 else
1418 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1419 spin_unlock_irqrestore(&dwc->lock, flags);
1420
1421 return ret;
1422}
1423
1424/* -------------------------------------------------------------------------- */
1425
1426static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1427 .bLength = USB_DT_ENDPOINT_SIZE,
1428 .bDescriptorType = USB_DT_ENDPOINT,
1429 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1430};
1431
1432static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1433 .enable = dwc3_gadget_ep0_enable,
1434 .disable = dwc3_gadget_ep0_disable,
1435 .alloc_request = dwc3_gadget_ep_alloc_request,
1436 .free_request = dwc3_gadget_ep_free_request,
1437 .queue = dwc3_gadget_ep0_queue,
1438 .dequeue = dwc3_gadget_ep_dequeue,
1439 .set_halt = dwc3_gadget_ep0_set_halt,
1440 .set_wedge = dwc3_gadget_ep_set_wedge,
1441};
1442
1443static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1444 .enable = dwc3_gadget_ep_enable,
1445 .disable = dwc3_gadget_ep_disable,
1446 .alloc_request = dwc3_gadget_ep_alloc_request,
1447 .free_request = dwc3_gadget_ep_free_request,
1448 .queue = dwc3_gadget_ep_queue,
1449 .dequeue = dwc3_gadget_ep_dequeue,
1450 .set_halt = dwc3_gadget_ep_set_halt,
1451 .set_wedge = dwc3_gadget_ep_set_wedge,
1452};
1453
1454/* -------------------------------------------------------------------------- */
1455
1456static int dwc3_gadget_get_frame(struct usb_gadget *g)
1457{
1458 struct dwc3 *dwc = gadget_to_dwc(g);
1459
1460 return __dwc3_gadget_get_frame(dwc);
1461}
1462
1463static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
1464{
1465 int retries;
1466
1467 int ret;
1468 u32 reg;
1469
1470 u8 link_state;
1471 u8 speed;
1472
1473 /*
1474 * According to the Databook Remote wakeup request should
1475 * be issued only when the device is in early suspend state.
1476 *
1477 * We can check that via USB Link State bits in DSTS register.
1478 */
1479 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1480
1481 speed = reg & DWC3_DSTS_CONNECTSPD;
1482 if ((speed == DWC3_DSTS_SUPERSPEED) ||
1483 (speed == DWC3_DSTS_SUPERSPEED_PLUS))
1484 return 0;
1485
1486 link_state = DWC3_DSTS_USBLNKST(reg);
1487
1488 switch (link_state) {
1489 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1490 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1491 break;
1492 default:
1493 return -EINVAL;
1494 }
1495
1496 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1497 if (ret < 0) {
1498 dev_err(dwc->dev, "failed to put link in Recovery\n");
1499 return ret;
1500 }
1501
1502 /* Recent versions do this automatically */
1503 if (dwc->revision < DWC3_REVISION_194A) {
1504 /* write zeroes to Link Change Request */
1505 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1506 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1507 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1508 }
1509
1510 /* poll until Link State changes to ON */
1511 retries = 20000;
1512
1513 while (retries--) {
1514 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1515
1516 /* in HS, means ON */
1517 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1518 break;
1519 }
1520
1521 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1522 dev_err(dwc->dev, "failed to send remote wakeup\n");
1523 return -EINVAL;
1524 }
1525
1526 return 0;
1527}
1528
1529static int dwc3_gadget_wakeup(struct usb_gadget *g)
1530{
1531 struct dwc3 *dwc = gadget_to_dwc(g);
1532 unsigned long flags;
1533 int ret;
1534
1535 spin_lock_irqsave(&dwc->lock, flags);
1536 ret = __dwc3_gadget_wakeup(dwc);
1537 spin_unlock_irqrestore(&dwc->lock, flags);
1538
1539 return ret;
1540}
1541
1542static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1543 int is_selfpowered)
1544{
1545 struct dwc3 *dwc = gadget_to_dwc(g);
1546 unsigned long flags;
1547
1548 spin_lock_irqsave(&dwc->lock, flags);
1549 g->is_selfpowered = !!is_selfpowered;
1550 spin_unlock_irqrestore(&dwc->lock, flags);
1551
1552 return 0;
1553}
1554
1555static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1556{
1557 u32 reg;
1558 u32 timeout = 500;
1559
1560 if (pm_runtime_suspended(dwc->dev))
1561 return 0;
1562
1563 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1564 if (is_on) {
1565 if (dwc->revision <= DWC3_REVISION_187A) {
1566 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1567 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1568 }
1569
1570 if (dwc->revision >= DWC3_REVISION_194A)
1571 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1572 reg |= DWC3_DCTL_RUN_STOP;
1573
1574 if (dwc->has_hibernation)
1575 reg |= DWC3_DCTL_KEEP_CONNECT;
1576
1577 dwc->pullups_connected = true;
1578 } else {
1579 reg &= ~DWC3_DCTL_RUN_STOP;
1580
1581 if (dwc->has_hibernation && !suspend)
1582 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1583
1584 dwc->pullups_connected = false;
1585 }
1586
1587 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1588
1589 do {
1590 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1591 reg &= DWC3_DSTS_DEVCTRLHLT;
1592 } while (--timeout && !(!is_on ^ !reg));
1593
1594 if (!timeout)
1595 return -ETIMEDOUT;
1596
1597 return 0;
1598}
1599
1600static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1601{
1602 struct dwc3 *dwc = gadget_to_dwc(g);
1603 unsigned long flags;
1604 int ret;
1605
1606 is_on = !!is_on;
1607
1608 /*
1609 * Per databook, when we want to stop the gadget, if a control transfer
1610 * is still in process, complete it and get the core into setup phase.
1611 */
1612 if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
1613 reinit_completion(&dwc->ep0_in_setup);
1614
1615 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
1616 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
1617 if (ret == 0) {
1618 dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
1619 return -ETIMEDOUT;
1620 }
1621 }
1622
1623 spin_lock_irqsave(&dwc->lock, flags);
1624 ret = dwc3_gadget_run_stop(dwc, is_on, false);
1625 spin_unlock_irqrestore(&dwc->lock, flags);
1626
1627 return ret;
1628}
1629
1630static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1631{
1632 u32 reg;
1633
1634 /* Enable all but Start and End of Frame IRQs */
1635 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1636 DWC3_DEVTEN_EVNTOVERFLOWEN |
1637 DWC3_DEVTEN_CMDCMPLTEN |
1638 DWC3_DEVTEN_ERRTICERREN |
1639 DWC3_DEVTEN_WKUPEVTEN |
1640 DWC3_DEVTEN_CONNECTDONEEN |
1641 DWC3_DEVTEN_USBRSTEN |
1642 DWC3_DEVTEN_DISCONNEVTEN);
1643
1644 if (dwc->revision < DWC3_REVISION_250A)
1645 reg |= DWC3_DEVTEN_ULSTCNGEN;
1646
1647 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1648}
1649
1650static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1651{
1652 /* mask all interrupts */
1653 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1654}
1655
1656static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1657static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1658
1659/**
1660 * dwc3_gadget_setup_nump - Calculate and initialize NUMP field of DCFG
1661 * dwc: pointer to our context structure
1662 *
1663 * The following looks like complex but it's actually very simple. In order to
1664 * calculate the number of packets we can burst at once on OUT transfers, we're
1665 * gonna use RxFIFO size.
1666 *
1667 * To calculate RxFIFO size we need two numbers:
1668 * MDWIDTH = size, in bits, of the internal memory bus
1669 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
1670 *
1671 * Given these two numbers, the formula is simple:
1672 *
1673 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
1674 *
1675 * 24 bytes is for 3x SETUP packets
1676 * 16 bytes is a clock domain crossing tolerance
1677 *
1678 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
1679 */
1680static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
1681{
1682 u32 ram2_depth;
1683 u32 mdwidth;
1684 u32 nump;
1685 u32 reg;
1686
1687 ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
1688 mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
1689
1690 nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
1691 nump = min_t(u32, nump, 16);
1692
1693 /* update NumP */
1694 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1695 reg &= ~DWC3_DCFG_NUMP_MASK;
1696 reg |= nump << DWC3_DCFG_NUMP_SHIFT;
1697 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1698}
1699
1700static int __dwc3_gadget_start(struct dwc3 *dwc)
1701{
1702 struct dwc3_ep *dep;
1703 int ret = 0;
1704 u32 reg;
1705
1706 /*
1707 * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
1708 * the core supports IMOD, disable it.
1709 */
1710 if (dwc->imod_interval) {
1711 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
1712 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
1713 } else if (dwc3_has_imod(dwc)) {
1714 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
1715 }
1716
1717 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1718 reg &= ~(DWC3_DCFG_SPEED_MASK);
1719
1720 /**
1721 * WORKAROUND: DWC3 revision < 2.20a have an issue
1722 * which would cause metastability state on Run/Stop
1723 * bit if we try to force the IP to USB2-only mode.
1724 *
1725 * Because of that, we cannot configure the IP to any
1726 * speed other than the SuperSpeed
1727 *
1728 * Refers to:
1729 *
1730 * STAR#9000525659: Clock Domain Crossing on DCTL in
1731 * USB 2.0 Mode
1732 */
1733 if (dwc->revision < DWC3_REVISION_220A) {
1734 reg |= DWC3_DCFG_SUPERSPEED;
1735 } else {
1736 switch (dwc->maximum_speed) {
1737 case USB_SPEED_LOW:
1738 reg |= DWC3_DCFG_LOWSPEED;
1739 break;
1740 case USB_SPEED_FULL:
1741 reg |= DWC3_DCFG_FULLSPEED;
1742 break;
1743 case USB_SPEED_HIGH:
1744 reg |= DWC3_DCFG_HIGHSPEED;
1745 break;
1746 case USB_SPEED_SUPER_PLUS:
1747 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
1748 break;
1749 default:
1750 dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n",
1751 dwc->maximum_speed);
1752 /* fall through */
1753 case USB_SPEED_SUPER:
1754 reg |= DWC3_DCFG_SUPERSPEED;
1755 break;
1756 }
1757 }
1758 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1759
1760 /*
1761 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
1762 * field instead of letting dwc3 itself calculate that automatically.
1763 *
1764 * This way, we maximize the chances that we'll be able to get several
1765 * bursts of data without going through any sort of endpoint throttling.
1766 */
1767 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1768 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
1769 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1770
1771 dwc3_gadget_setup_nump(dwc);
1772
1773 /* Start with SuperSpeed Default */
1774 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1775
1776 dep = dwc->eps[0];
1777 ret = __dwc3_gadget_ep_enable(dep, false, false);
1778 if (ret) {
1779 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1780 goto err0;
1781 }
1782
1783 dep = dwc->eps[1];
1784 ret = __dwc3_gadget_ep_enable(dep, false, false);
1785 if (ret) {
1786 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1787 goto err1;
1788 }
1789
1790 /* begin to receive SETUP packets */
1791 dwc->ep0state = EP0_SETUP_PHASE;
1792 dwc3_ep0_out_start(dwc);
1793
1794 dwc3_gadget_enable_irq(dwc);
1795
1796 return 0;
1797
1798err1:
1799 __dwc3_gadget_ep_disable(dwc->eps[0]);
1800
1801err0:
1802 return ret;
1803}
1804
1805static int dwc3_gadget_start(struct usb_gadget *g,
1806 struct usb_gadget_driver *driver)
1807{
1808 struct dwc3 *dwc = gadget_to_dwc(g);
1809 unsigned long flags;
1810 int ret = 0;
1811 int irq;
1812
1813 irq = dwc->irq_gadget;
1814 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1815 IRQF_SHARED, "dwc3", dwc->ev_buf);
1816 if (ret) {
1817 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1818 irq, ret);
1819 goto err0;
1820 }
1821
1822 spin_lock_irqsave(&dwc->lock, flags);
1823 if (dwc->gadget_driver) {
1824 dev_err(dwc->dev, "%s is already bound to %s\n",
1825 dwc->gadget.name,
1826 dwc->gadget_driver->driver.name);
1827 ret = -EBUSY;
1828 goto err1;
1829 }
1830
1831 dwc->gadget_driver = driver;
1832
1833 if (pm_runtime_active(dwc->dev))
1834 __dwc3_gadget_start(dwc);
1835
1836 spin_unlock_irqrestore(&dwc->lock, flags);
1837
1838 return 0;
1839
1840err1:
1841 spin_unlock_irqrestore(&dwc->lock, flags);
1842 free_irq(irq, dwc);
1843
1844err0:
1845 return ret;
1846}
1847
1848static void __dwc3_gadget_stop(struct dwc3 *dwc)
1849{
1850 dwc3_gadget_disable_irq(dwc);
1851 __dwc3_gadget_ep_disable(dwc->eps[0]);
1852 __dwc3_gadget_ep_disable(dwc->eps[1]);
1853}
1854
1855static int dwc3_gadget_stop(struct usb_gadget *g)
1856{
1857 struct dwc3 *dwc = gadget_to_dwc(g);
1858 unsigned long flags;
1859 int epnum;
1860
1861 spin_lock_irqsave(&dwc->lock, flags);
1862
1863 if (pm_runtime_suspended(dwc->dev))
1864 goto out;
1865
1866 __dwc3_gadget_stop(dwc);
1867
1868 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1869 struct dwc3_ep *dep = dwc->eps[epnum];
1870
1871 if (!dep)
1872 continue;
1873
1874 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
1875 continue;
1876
1877 wait_event_lock_irq(dep->wait_end_transfer,
1878 !(dep->flags & DWC3_EP_END_TRANSFER_PENDING),
1879 dwc->lock);
1880 }
1881
1882out:
1883 dwc->gadget_driver = NULL;
1884 spin_unlock_irqrestore(&dwc->lock, flags);
1885
1886 free_irq(dwc->irq_gadget, dwc->ev_buf);
1887
1888 return 0;
1889}
1890
1891static const struct usb_gadget_ops dwc3_gadget_ops = {
1892 .get_frame = dwc3_gadget_get_frame,
1893 .wakeup = dwc3_gadget_wakeup,
1894 .set_selfpowered = dwc3_gadget_set_selfpowered,
1895 .pullup = dwc3_gadget_pullup,
1896 .udc_start = dwc3_gadget_start,
1897 .udc_stop = dwc3_gadget_stop,
1898};
1899
1900/* -------------------------------------------------------------------------- */
1901
1902static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1903 u8 num, u32 direction)
1904{
1905 struct dwc3_ep *dep;
1906 u8 i;
1907
1908 for (i = 0; i < num; i++) {
1909 u8 epnum = (i << 1) | (direction ? 1 : 0);
1910
1911 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1912 if (!dep)
1913 return -ENOMEM;
1914
1915 dep->dwc = dwc;
1916 dep->number = epnum;
1917 dep->direction = !!direction;
1918 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
1919 dwc->eps[epnum] = dep;
1920
1921 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1922 (epnum & 1) ? "in" : "out");
1923
1924 dep->endpoint.name = dep->name;
1925
1926 if (!(dep->number > 1)) {
1927 dep->endpoint.desc = &dwc3_gadget_ep0_desc;
1928 dep->endpoint.comp_desc = NULL;
1929 }
1930
1931 spin_lock_init(&dep->lock);
1932
1933 if (epnum == 0 || epnum == 1) {
1934 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1935 dep->endpoint.maxburst = 1;
1936 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1937 if (!epnum)
1938 dwc->gadget.ep0 = &dep->endpoint;
1939 } else {
1940 int ret;
1941
1942 usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1943 dep->endpoint.max_streams = 15;
1944 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1945 list_add_tail(&dep->endpoint.ep_list,
1946 &dwc->gadget.ep_list);
1947
1948 ret = dwc3_alloc_trb_pool(dep);
1949 if (ret)
1950 return ret;
1951 }
1952
1953 if (epnum == 0 || epnum == 1) {
1954 dep->endpoint.caps.type_control = true;
1955 } else {
1956 dep->endpoint.caps.type_iso = true;
1957 dep->endpoint.caps.type_bulk = true;
1958 dep->endpoint.caps.type_int = true;
1959 }
1960
1961 dep->endpoint.caps.dir_in = !!direction;
1962 dep->endpoint.caps.dir_out = !direction;
1963
1964 INIT_LIST_HEAD(&dep->pending_list);
1965 INIT_LIST_HEAD(&dep->started_list);
1966 }
1967
1968 return 0;
1969}
1970
1971static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1972{
1973 int ret;
1974
1975 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1976
1977 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1978 if (ret < 0) {
1979 dev_err(dwc->dev, "failed to initialize OUT endpoints\n");
1980 return ret;
1981 }
1982
1983 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1984 if (ret < 0) {
1985 dev_err(dwc->dev, "failed to initialize IN endpoints\n");
1986 return ret;
1987 }
1988
1989 return 0;
1990}
1991
1992static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1993{
1994 struct dwc3_ep *dep;
1995 u8 epnum;
1996
1997 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1998 dep = dwc->eps[epnum];
1999 if (!dep)
2000 continue;
2001 /*
2002 * Physical endpoints 0 and 1 are special; they form the
2003 * bi-directional USB endpoint 0.
2004 *
2005 * For those two physical endpoints, we don't allocate a TRB
2006 * pool nor do we add them the endpoints list. Due to that, we
2007 * shouldn't do these two operations otherwise we would end up
2008 * with all sorts of bugs when removing dwc3.ko.
2009 */
2010 if (epnum != 0 && epnum != 1) {
2011 dwc3_free_trb_pool(dep);
2012 list_del(&dep->endpoint.ep_list);
2013 }
2014
2015 kfree(dep);
2016 }
2017}
2018
2019/* -------------------------------------------------------------------------- */
2020
2021static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
2022 struct dwc3_request *req, struct dwc3_trb *trb,
2023 const struct dwc3_event_depevt *event, int status,
2024 int chain)
2025{
2026 unsigned int count;
2027 unsigned int s_pkt = 0;
2028 unsigned int trb_status;
2029
2030 dwc3_ep_inc_deq(dep);
2031
2032 if (req->trb == trb)
2033 dep->queued_requests--;
2034
2035 trace_dwc3_complete_trb(dep, trb);
2036
2037 /*
2038 * If we're in the middle of series of chained TRBs and we
2039 * receive a short transfer along the way, DWC3 will skip
2040 * through all TRBs including the last TRB in the chain (the
2041 * where CHN bit is zero. DWC3 will also avoid clearing HWO
2042 * bit and SW has to do it manually.
2043 *
2044 * We're going to do that here to avoid problems of HW trying
2045 * to use bogus TRBs for transfers.
2046 */
2047 if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
2048 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2049
2050 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
2051 return 1;
2052
2053 count = trb->size & DWC3_TRB_SIZE_MASK;
2054 req->remaining += count;
2055
2056 if (dep->direction) {
2057 if (count) {
2058 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
2059 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
2060 /*
2061 * If missed isoc occurred and there is
2062 * no request queued then issue END
2063 * TRANSFER, so that core generates
2064 * next xfernotready and we will issue
2065 * a fresh START TRANSFER.
2066 * If there are still queued request
2067 * then wait, do not issue either END
2068 * or UPDATE TRANSFER, just attach next
2069 * request in pending_list during
2070 * giveback.If any future queued request
2071 * is successfully transferred then we
2072 * will issue UPDATE TRANSFER for all
2073 * request in the pending_list.
2074 */
2075 dep->flags |= DWC3_EP_MISSED_ISOC;
2076 } else {
2077 dev_err(dwc->dev, "incomplete IN transfer %s\n",
2078 dep->name);
2079 status = -ECONNRESET;
2080 }
2081 } else {
2082 dep->flags &= ~DWC3_EP_MISSED_ISOC;
2083 }
2084 } else {
2085 if (count && (event->status & DEPEVT_STATUS_SHORT))
2086 s_pkt = 1;
2087 }
2088
2089 if (s_pkt && !chain)
2090 return 1;
2091
2092 if ((event->status & DEPEVT_STATUS_IOC) &&
2093 (trb->ctrl & DWC3_TRB_CTRL_IOC))
2094 return 1;
2095
2096 return 0;
2097}
2098
2099static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
2100 const struct dwc3_event_depevt *event, int status)
2101{
2102 struct dwc3_request *req, *n;
2103 struct dwc3_trb *trb;
2104 bool ioc = false;
2105 int ret = 0;
2106
2107 list_for_each_entry_safe(req, n, &dep->started_list, list) {
2108 unsigned length;
2109 int chain;
2110
2111 length = req->request.length;
2112 chain = req->num_pending_sgs > 0;
2113 if (chain) {
2114 struct scatterlist *sg = req->sg;
2115 struct scatterlist *s;
2116 unsigned int pending = req->num_pending_sgs;
2117 unsigned int i;
2118
2119 for_each_sg(sg, s, pending, i) {
2120 trb = &dep->trb_pool[dep->trb_dequeue];
2121
2122 if (trb->ctrl & DWC3_TRB_CTRL_HWO)
2123 break;
2124
2125 req->sg = sg_next(s);
2126 req->num_pending_sgs--;
2127
2128 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
2129 event, status, chain);
2130 if (ret)
2131 break;
2132 }
2133 } else {
2134 trb = &dep->trb_pool[dep->trb_dequeue];
2135 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
2136 event, status, chain);
2137 }
2138
2139 req->request.actual = length - req->remaining;
2140
2141 if ((req->request.actual < length) && req->num_pending_sgs)
2142 return __dwc3_gadget_kick_transfer(dep, 0);
2143
2144 dwc3_gadget_giveback(dep, req, status);
2145
2146 if (ret) {
2147 if ((event->status & DEPEVT_STATUS_IOC) &&
2148 (trb->ctrl & DWC3_TRB_CTRL_IOC))
2149 ioc = true;
2150 break;
2151 }
2152 }
2153
2154 /*
2155 * Our endpoint might get disabled by another thread during
2156 * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2157 * early on so DWC3_EP_BUSY flag gets cleared
2158 */
2159 if (!dep->endpoint.desc)
2160 return 1;
2161
2162 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
2163 list_empty(&dep->started_list)) {
2164 if (list_empty(&dep->pending_list)) {
2165 /*
2166 * If there is no entry in request list then do
2167 * not issue END TRANSFER now. Just set PENDING
2168 * flag, so that END TRANSFER is issued when an
2169 * entry is added into request list.
2170 */
2171 dep->flags = DWC3_EP_PENDING_REQUEST;
2172 } else {
2173 dwc3_stop_active_transfer(dwc, dep->number, true);
2174 dep->flags = DWC3_EP_ENABLED;
2175 }
2176 return 1;
2177 }
2178
2179 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && ioc)
2180 return 0;
2181
2182 return 1;
2183}
2184
2185static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
2186 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
2187{
2188 unsigned status = 0;
2189 int clean_busy;
2190 u32 is_xfer_complete;
2191
2192 is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
2193
2194 if (event->status & DEPEVT_STATUS_BUSERR)
2195 status = -ECONNRESET;
2196
2197 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
2198 if (clean_busy && (!dep->endpoint.desc || is_xfer_complete ||
2199 usb_endpoint_xfer_isoc(dep->endpoint.desc)))
2200 dep->flags &= ~DWC3_EP_BUSY;
2201
2202 /*
2203 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2204 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2205 */
2206 if (dwc->revision < DWC3_REVISION_183A) {
2207 u32 reg;
2208 int i;
2209
2210 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
2211 dep = dwc->eps[i];
2212
2213 if (!(dep->flags & DWC3_EP_ENABLED))
2214 continue;
2215
2216 if (!list_empty(&dep->started_list))
2217 return;
2218 }
2219
2220 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2221 reg |= dwc->u1u2;
2222 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2223
2224 dwc->u1u2 = 0;
2225 }
2226
2227 /*
2228 * Our endpoint might get disabled by another thread during
2229 * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2230 * early on so DWC3_EP_BUSY flag gets cleared
2231 */
2232 if (!dep->endpoint.desc)
2233 return;
2234
2235 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2236 int ret;
2237
2238 ret = __dwc3_gadget_kick_transfer(dep, 0);
2239 if (!ret || ret == -EBUSY)
2240 return;
2241 }
2242}
2243
2244static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2245 const struct dwc3_event_depevt *event)
2246{
2247 struct dwc3_ep *dep;
2248 u8 epnum = event->endpoint_number;
2249 u8 cmd;
2250
2251 dep = dwc->eps[epnum];
2252
2253 if (!(dep->flags & DWC3_EP_ENABLED)) {
2254 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
2255 return;
2256
2257 /* Handle only EPCMDCMPLT when EP disabled */
2258 if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
2259 return;
2260 }
2261
2262 if (epnum == 0 || epnum == 1) {
2263 dwc3_ep0_interrupt(dwc, event);
2264 return;
2265 }
2266
2267 switch (event->endpoint_event) {
2268 case DWC3_DEPEVT_XFERCOMPLETE:
2269 dep->resource_index = 0;
2270
2271 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2272 dev_err(dwc->dev, "XferComplete for Isochronous endpoint\n");
2273 return;
2274 }
2275
2276 dwc3_endpoint_transfer_complete(dwc, dep, event);
2277 break;
2278 case DWC3_DEPEVT_XFERINPROGRESS:
2279 dwc3_endpoint_transfer_complete(dwc, dep, event);
2280 break;
2281 case DWC3_DEPEVT_XFERNOTREADY:
2282 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2283 dwc3_gadget_start_isoc(dwc, dep, event);
2284 } else {
2285 int ret;
2286
2287 ret = __dwc3_gadget_kick_transfer(dep, 0);
2288 if (!ret || ret == -EBUSY)
2289 return;
2290 }
2291
2292 break;
2293 case DWC3_DEPEVT_STREAMEVT:
2294 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
2295 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2296 dep->name);
2297 return;
2298 }
2299 break;
2300 case DWC3_DEPEVT_EPCMDCMPLT:
2301 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
2302
2303 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
2304 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
2305 wake_up(&dep->wait_end_transfer);
2306 }
2307 break;
2308 case DWC3_DEPEVT_RXTXFIFOEVT:
2309 break;
2310 }
2311}
2312
2313static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2314{
2315 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2316 spin_unlock(&dwc->lock);
2317 dwc->gadget_driver->disconnect(&dwc->gadget);
2318 spin_lock(&dwc->lock);
2319 }
2320}
2321
2322static void dwc3_suspend_gadget(struct dwc3 *dwc)
2323{
2324 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2325 spin_unlock(&dwc->lock);
2326 dwc->gadget_driver->suspend(&dwc->gadget);
2327 spin_lock(&dwc->lock);
2328 }
2329}
2330
2331static void dwc3_resume_gadget(struct dwc3 *dwc)
2332{
2333 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2334 spin_unlock(&dwc->lock);
2335 dwc->gadget_driver->resume(&dwc->gadget);
2336 spin_lock(&dwc->lock);
2337 }
2338}
2339
2340static void dwc3_reset_gadget(struct dwc3 *dwc)
2341{
2342 if (!dwc->gadget_driver)
2343 return;
2344
2345 if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2346 spin_unlock(&dwc->lock);
2347 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2348 spin_lock(&dwc->lock);
2349 }
2350}
2351
2352static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2353{
2354 struct dwc3_ep *dep;
2355 struct dwc3_gadget_ep_cmd_params params;
2356 u32 cmd;
2357 int ret;
2358
2359 dep = dwc->eps[epnum];
2360
2361 if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
2362 !dep->resource_index)
2363 return;
2364
2365 /*
2366 * NOTICE: We are violating what the Databook says about the
2367 * EndTransfer command. Ideally we would _always_ wait for the
2368 * EndTransfer Command Completion IRQ, but that's causing too
2369 * much trouble synchronizing between us and gadget driver.
2370 *
2371 * We have discussed this with the IP Provider and it was
2372 * suggested to giveback all requests here, but give HW some
2373 * extra time to synchronize with the interconnect. We're using
2374 * an arbitrary 100us delay for that.
2375 *
2376 * Note also that a similar handling was tested by Synopsys
2377 * (thanks a lot Paul) and nothing bad has come out of it.
2378 * In short, what we're doing is:
2379 *
2380 * - Issue EndTransfer WITH CMDIOC bit set
2381 * - Wait 100us
2382 *
2383 * As of IP version 3.10a of the DWC_usb3 IP, the controller
2384 * supports a mode to work around the above limitation. The
2385 * software can poll the CMDACT bit in the DEPCMD register
2386 * after issuing a EndTransfer command. This mode is enabled
2387 * by writing GUCTL2[14]. This polling is already done in the
2388 * dwc3_send_gadget_ep_cmd() function so if the mode is
2389 * enabled, the EndTransfer command will have completed upon
2390 * returning from this function and we don't need to delay for
2391 * 100us.
2392 *
2393 * This mode is NOT available on the DWC_usb31 IP.
2394 */
2395
2396 cmd = DWC3_DEPCMD_ENDTRANSFER;
2397 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2398 cmd |= DWC3_DEPCMD_CMDIOC;
2399 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2400 memset(¶ms, 0, sizeof(params));
2401 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
2402 WARN_ON_ONCE(ret);
2403 dep->resource_index = 0;
2404 dep->flags &= ~DWC3_EP_BUSY;
2405
2406 if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) {
2407 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
2408 udelay(100);
2409 }
2410}
2411
2412static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2413{
2414 u32 epnum;
2415
2416 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2417 struct dwc3_ep *dep;
2418 int ret;
2419
2420 dep = dwc->eps[epnum];
2421 if (!dep)
2422 continue;
2423
2424 if (!(dep->flags & DWC3_EP_STALL))
2425 continue;
2426
2427 dep->flags &= ~DWC3_EP_STALL;
2428
2429 ret = dwc3_send_clear_stall_ep_cmd(dep);
2430 WARN_ON_ONCE(ret);
2431 }
2432}
2433
2434static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2435{
2436 int reg;
2437
2438 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2439 reg &= ~DWC3_DCTL_INITU1ENA;
2440 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2441
2442 reg &= ~DWC3_DCTL_INITU2ENA;
2443 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2444
2445 dwc3_disconnect_gadget(dwc);
2446
2447 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2448 dwc->setup_packet_pending = false;
2449 usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2450
2451 dwc->connected = false;
2452}
2453
2454static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2455{
2456 u32 reg;
2457
2458 dwc->connected = true;
2459
2460 /*
2461 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2462 * would cause a missing Disconnect Event if there's a
2463 * pending Setup Packet in the FIFO.
2464 *
2465 * There's no suggested workaround on the official Bug
2466 * report, which states that "unless the driver/application
2467 * is doing any special handling of a disconnect event,
2468 * there is no functional issue".
2469 *
2470 * Unfortunately, it turns out that we _do_ some special
2471 * handling of a disconnect event, namely complete all
2472 * pending transfers, notify gadget driver of the
2473 * disconnection, and so on.
2474 *
2475 * Our suggested workaround is to follow the Disconnect
2476 * Event steps here, instead, based on a setup_packet_pending
2477 * flag. Such flag gets set whenever we have a SETUP_PENDING
2478 * status for EP0 TRBs and gets cleared on XferComplete for the
2479 * same endpoint.
2480 *
2481 * Refers to:
2482 *
2483 * STAR#9000466709: RTL: Device : Disconnect event not
2484 * generated if setup packet pending in FIFO
2485 */
2486 if (dwc->revision < DWC3_REVISION_188A) {
2487 if (dwc->setup_packet_pending)
2488 dwc3_gadget_disconnect_interrupt(dwc);
2489 }
2490
2491 dwc3_reset_gadget(dwc);
2492
2493 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2494 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2495 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2496 dwc->test_mode = false;
2497 dwc3_clear_stall_all_ep(dwc);
2498
2499 /* Reset device address to zero */
2500 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2501 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2502 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2503}
2504
2505static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2506{
2507 struct dwc3_ep *dep;
2508 int ret;
2509 u32 reg;
2510 u8 speed;
2511
2512 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2513 speed = reg & DWC3_DSTS_CONNECTSPD;
2514 dwc->speed = speed;
2515
2516 /*
2517 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2518 * each time on Connect Done.
2519 *
2520 * Currently we always use the reset value. If any platform
2521 * wants to set this to a different value, we need to add a
2522 * setting and update GCTL.RAMCLKSEL here.
2523 */
2524
2525 switch (speed) {
2526 case DWC3_DSTS_SUPERSPEED_PLUS:
2527 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2528 dwc->gadget.ep0->maxpacket = 512;
2529 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2530 break;
2531 case DWC3_DSTS_SUPERSPEED:
2532 /*
2533 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2534 * would cause a missing USB3 Reset event.
2535 *
2536 * In such situations, we should force a USB3 Reset
2537 * event by calling our dwc3_gadget_reset_interrupt()
2538 * routine.
2539 *
2540 * Refers to:
2541 *
2542 * STAR#9000483510: RTL: SS : USB3 reset event may
2543 * not be generated always when the link enters poll
2544 */
2545 if (dwc->revision < DWC3_REVISION_190A)
2546 dwc3_gadget_reset_interrupt(dwc);
2547
2548 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2549 dwc->gadget.ep0->maxpacket = 512;
2550 dwc->gadget.speed = USB_SPEED_SUPER;
2551 break;
2552 case DWC3_DSTS_HIGHSPEED:
2553 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2554 dwc->gadget.ep0->maxpacket = 64;
2555 dwc->gadget.speed = USB_SPEED_HIGH;
2556 break;
2557 case DWC3_DSTS_FULLSPEED:
2558 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2559 dwc->gadget.ep0->maxpacket = 64;
2560 dwc->gadget.speed = USB_SPEED_FULL;
2561 break;
2562 case DWC3_DSTS_LOWSPEED:
2563 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2564 dwc->gadget.ep0->maxpacket = 8;
2565 dwc->gadget.speed = USB_SPEED_LOW;
2566 break;
2567 }
2568
2569 /* Enable USB2 LPM Capability */
2570
2571 if ((dwc->revision > DWC3_REVISION_194A) &&
2572 (speed != DWC3_DSTS_SUPERSPEED) &&
2573 (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
2574 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2575 reg |= DWC3_DCFG_LPM_CAP;
2576 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2577
2578 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2579 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2580
2581 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2582
2583 /*
2584 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2585 * DCFG.LPMCap is set, core responses with an ACK and the
2586 * BESL value in the LPM token is less than or equal to LPM
2587 * NYET threshold.
2588 */
2589 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2590 && dwc->has_lpm_erratum,
2591 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
2592
2593 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2594 reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2595
2596 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2597 } else {
2598 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2599 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2600 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2601 }
2602
2603 dep = dwc->eps[0];
2604 ret = __dwc3_gadget_ep_enable(dep, true, false);
2605 if (ret) {
2606 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2607 return;
2608 }
2609
2610 dep = dwc->eps[1];
2611 ret = __dwc3_gadget_ep_enable(dep, true, false);
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{
2628 /*
2629 * TODO take core out of low power mode when that's
2630 * implemented.
2631 */
2632
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 }
2638}
2639
2640static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2641 unsigned int evtinfo)
2642{
2643 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
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)) {
2668 return;
2669 }
2670 }
2671
2672 /*
2673 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2674 * on the link partner, the USB session might do multiple entry/exit
2675 * of low power states before a transfer takes place.
2676 *
2677 * Due to this problem, we might experience lower throughput. The
2678 * suggested workaround is to disable DCTL[12:9] bits if we're
2679 * transitioning from U1/U2 to U0 and enable those bits again
2680 * after a transfer completes and there are no pending transfers
2681 * on any of the enabled endpoints.
2682 *
2683 * This is the first half of that workaround.
2684 *
2685 * Refers to:
2686 *
2687 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2688 * core send LGO_Ux entering U0
2689 */
2690 if (dwc->revision < DWC3_REVISION_183A) {
2691 if (next == DWC3_LINK_STATE_U0) {
2692 u32 u1u2;
2693 u32 reg;
2694
2695 switch (dwc->link_state) {
2696 case DWC3_LINK_STATE_U1:
2697 case DWC3_LINK_STATE_U2:
2698 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2699 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2700 | DWC3_DCTL_ACCEPTU2ENA
2701 | DWC3_DCTL_INITU1ENA
2702 | DWC3_DCTL_ACCEPTU1ENA);
2703
2704 if (!dwc->u1u2)
2705 dwc->u1u2 = reg & u1u2;
2706
2707 reg &= ~u1u2;
2708
2709 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2710 break;
2711 default:
2712 /* do nothing */
2713 break;
2714 }
2715 }
2716 }
2717
2718 switch (next) {
2719 case DWC3_LINK_STATE_U1:
2720 if (dwc->speed == USB_SPEED_SUPER)
2721 dwc3_suspend_gadget(dwc);
2722 break;
2723 case DWC3_LINK_STATE_U2:
2724 case DWC3_LINK_STATE_U3:
2725 dwc3_suspend_gadget(dwc);
2726 break;
2727 case DWC3_LINK_STATE_RESUME:
2728 dwc3_resume_gadget(dwc);
2729 break;
2730 default:
2731 /* do nothing */
2732 break;
2733 }
2734
2735 dwc->link_state = next;
2736}
2737
2738static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
2739 unsigned int evtinfo)
2740{
2741 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2742
2743 if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
2744 dwc3_suspend_gadget(dwc);
2745
2746 dwc->link_state = next;
2747}
2748
2749static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2750 unsigned int evtinfo)
2751{
2752 unsigned int is_ss = evtinfo & BIT(4);
2753
2754 /**
2755 * WORKAROUND: DWC3 revison 2.20a with hibernation support
2756 * have a known issue which can cause USB CV TD.9.23 to fail
2757 * randomly.
2758 *
2759 * Because of this issue, core could generate bogus hibernation
2760 * events which SW needs to ignore.
2761 *
2762 * Refers to:
2763 *
2764 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2765 * Device Fallback from SuperSpeed
2766 */
2767 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2768 return;
2769
2770 /* enter hibernation here */
2771}
2772
2773static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2774 const struct dwc3_event_devt *event)
2775{
2776 switch (event->type) {
2777 case DWC3_DEVICE_EVENT_DISCONNECT:
2778 dwc3_gadget_disconnect_interrupt(dwc);
2779 break;
2780 case DWC3_DEVICE_EVENT_RESET:
2781 dwc3_gadget_reset_interrupt(dwc);
2782 break;
2783 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2784 dwc3_gadget_conndone_interrupt(dwc);
2785 break;
2786 case DWC3_DEVICE_EVENT_WAKEUP:
2787 dwc3_gadget_wakeup_interrupt(dwc);
2788 break;
2789 case DWC3_DEVICE_EVENT_HIBER_REQ:
2790 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2791 "unexpected hibernation event\n"))
2792 break;
2793
2794 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2795 break;
2796 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2797 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2798 break;
2799 case DWC3_DEVICE_EVENT_EOPF:
2800 /* It changed to be suspend event for version 2.30a and above */
2801 if (dwc->revision >= DWC3_REVISION_230A) {
2802 /*
2803 * Ignore suspend event until the gadget enters into
2804 * USB_STATE_CONFIGURED state.
2805 */
2806 if (dwc->gadget.state >= USB_STATE_CONFIGURED)
2807 dwc3_gadget_suspend_interrupt(dwc,
2808 event->event_info);
2809 }
2810 break;
2811 case DWC3_DEVICE_EVENT_SOF:
2812 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2813 case DWC3_DEVICE_EVENT_CMD_CMPL:
2814 case DWC3_DEVICE_EVENT_OVERFLOW:
2815 break;
2816 default:
2817 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2818 }
2819}
2820
2821static void dwc3_process_event_entry(struct dwc3 *dwc,
2822 const union dwc3_event *event)
2823{
2824 trace_dwc3_event(event->raw, dwc);
2825
2826 /* Endpoint IRQ, handle it and return early */
2827 if (event->type.is_devspec == 0) {
2828 /* depevt */
2829 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2830 }
2831
2832 switch (event->type.type) {
2833 case DWC3_EVENT_TYPE_DEV:
2834 dwc3_gadget_interrupt(dwc, &event->devt);
2835 break;
2836 /* REVISIT what to do with Carkit and I2C events ? */
2837 default:
2838 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2839 }
2840}
2841
2842static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
2843{
2844 struct dwc3 *dwc = evt->dwc;
2845 irqreturn_t ret = IRQ_NONE;
2846 int left;
2847 u32 reg;
2848
2849 left = evt->count;
2850
2851 if (!(evt->flags & DWC3_EVENT_PENDING))
2852 return IRQ_NONE;
2853
2854 while (left > 0) {
2855 union dwc3_event event;
2856
2857 event.raw = *(u32 *) (evt->cache + evt->lpos);
2858
2859 dwc3_process_event_entry(dwc, &event);
2860
2861 /*
2862 * FIXME we wrap around correctly to the next entry as
2863 * almost all entries are 4 bytes in size. There is one
2864 * entry which has 12 bytes which is a regular entry
2865 * followed by 8 bytes data. ATM I don't know how
2866 * things are organized if we get next to the a
2867 * boundary so I worry about that once we try to handle
2868 * that.
2869 */
2870 evt->lpos = (evt->lpos + 4) % evt->length;
2871 left -= 4;
2872 }
2873
2874 evt->count = 0;
2875 evt->flags &= ~DWC3_EVENT_PENDING;
2876 ret = IRQ_HANDLED;
2877
2878 /* Unmask interrupt */
2879 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
2880 reg &= ~DWC3_GEVNTSIZ_INTMASK;
2881 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
2882
2883 if (dwc->imod_interval) {
2884 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
2885 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
2886 }
2887
2888 return ret;
2889}
2890
2891static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
2892{
2893 struct dwc3_event_buffer *evt = _evt;
2894 struct dwc3 *dwc = evt->dwc;
2895 unsigned long flags;
2896 irqreturn_t ret = IRQ_NONE;
2897
2898 spin_lock_irqsave(&dwc->lock, flags);
2899 ret = dwc3_process_event_buf(evt);
2900 spin_unlock_irqrestore(&dwc->lock, flags);
2901
2902 return ret;
2903}
2904
2905static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
2906{
2907 struct dwc3 *dwc = evt->dwc;
2908 u32 amount;
2909 u32 count;
2910 u32 reg;
2911
2912 if (pm_runtime_suspended(dwc->dev)) {
2913 pm_runtime_get(dwc->dev);
2914 disable_irq_nosync(dwc->irq_gadget);
2915 dwc->pending_events = true;
2916 return IRQ_HANDLED;
2917 }
2918
2919 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
2920 count &= DWC3_GEVNTCOUNT_MASK;
2921 if (!count)
2922 return IRQ_NONE;
2923
2924 evt->count = count;
2925 evt->flags |= DWC3_EVENT_PENDING;
2926
2927 /* Mask interrupt */
2928 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
2929 reg |= DWC3_GEVNTSIZ_INTMASK;
2930 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
2931
2932 amount = min(count, evt->length - evt->lpos);
2933 memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
2934
2935 if (amount < count)
2936 memcpy(evt->cache, evt->buf, count - amount);
2937
2938 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
2939
2940 return IRQ_WAKE_THREAD;
2941}
2942
2943static irqreturn_t dwc3_interrupt(int irq, void *_evt)
2944{
2945 struct dwc3_event_buffer *evt = _evt;
2946
2947 return dwc3_check_event_buf(evt);
2948}
2949
2950static int dwc3_gadget_get_irq(struct dwc3 *dwc)
2951{
2952 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
2953 int irq;
2954
2955 irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
2956 if (irq > 0)
2957 goto out;
2958
2959 if (irq == -EPROBE_DEFER)
2960 goto out;
2961
2962 irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
2963 if (irq > 0)
2964 goto out;
2965
2966 if (irq == -EPROBE_DEFER)
2967 goto out;
2968
2969 irq = platform_get_irq(dwc3_pdev, 0);
2970 if (irq > 0)
2971 goto out;
2972
2973 if (irq != -EPROBE_DEFER)
2974 dev_err(dwc->dev, "missing peripheral IRQ\n");
2975
2976 if (!irq)
2977 irq = -EINVAL;
2978
2979out:
2980 return irq;
2981}
2982
2983/**
2984 * dwc3_gadget_init - Initializes gadget related registers
2985 * @dwc: pointer to our controller context structure
2986 *
2987 * Returns 0 on success otherwise negative errno.
2988 */
2989int dwc3_gadget_init(struct dwc3 *dwc)
2990{
2991 int ret;
2992 int irq;
2993
2994 irq = dwc3_gadget_get_irq(dwc);
2995 if (irq < 0) {
2996 ret = irq;
2997 goto err0;
2998 }
2999
3000 dwc->irq_gadget = irq;
3001
3002 dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
3003 &dwc->ctrl_req_addr, GFP_KERNEL);
3004 if (!dwc->ctrl_req) {
3005 dev_err(dwc->dev, "failed to allocate ctrl request\n");
3006 ret = -ENOMEM;
3007 goto err0;
3008 }
3009
3010 dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
3011 sizeof(*dwc->ep0_trb) * 2,
3012 &dwc->ep0_trb_addr, GFP_KERNEL);
3013 if (!dwc->ep0_trb) {
3014 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
3015 ret = -ENOMEM;
3016 goto err1;
3017 }
3018
3019 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
3020 if (!dwc->setup_buf) {
3021 ret = -ENOMEM;
3022 goto err2;
3023 }
3024
3025 dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
3026 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
3027 GFP_KERNEL);
3028 if (!dwc->ep0_bounce) {
3029 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
3030 ret = -ENOMEM;
3031 goto err3;
3032 }
3033
3034 dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);
3035 if (!dwc->zlp_buf) {
3036 ret = -ENOMEM;
3037 goto err4;
3038 }
3039
3040 init_completion(&dwc->ep0_in_setup);
3041
3042 dwc->gadget.ops = &dwc3_gadget_ops;
3043 dwc->gadget.speed = USB_SPEED_UNKNOWN;
3044 dwc->gadget.sg_supported = true;
3045 dwc->gadget.name = "dwc3-gadget";
3046 dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG;
3047
3048 /*
3049 * FIXME We might be setting max_speed to <SUPER, however versions
3050 * <2.20a of dwc3 have an issue with metastability (documented
3051 * elsewhere in this driver) which tells us we can't set max speed to
3052 * anything lower than SUPER.
3053 *
3054 * Because gadget.max_speed is only used by composite.c and function
3055 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
3056 * to happen so we avoid sending SuperSpeed Capability descriptor
3057 * together with our BOS descriptor as that could confuse host into
3058 * thinking we can handle super speed.
3059 *
3060 * Note that, in fact, we won't even support GetBOS requests when speed
3061 * is less than super speed because we don't have means, yet, to tell
3062 * composite.c that we are USB 2.0 + LPM ECN.
3063 */
3064 if (dwc->revision < DWC3_REVISION_220A)
3065 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
3066 dwc->revision);
3067
3068 dwc->gadget.max_speed = dwc->maximum_speed;
3069
3070 /*
3071 * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
3072 * on ep out.
3073 */
3074 dwc->gadget.quirk_ep_out_aligned_size = true;
3075
3076 /*
3077 * REVISIT: Here we should clear all pending IRQs to be
3078 * sure we're starting from a well known location.
3079 */
3080
3081 ret = dwc3_gadget_init_endpoints(dwc);
3082 if (ret)
3083 goto err5;
3084
3085 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
3086 if (ret) {
3087 dev_err(dwc->dev, "failed to register udc\n");
3088 goto err5;
3089 }
3090
3091 return 0;
3092
3093err5:
3094 kfree(dwc->zlp_buf);
3095
3096err4:
3097 dwc3_gadget_free_endpoints(dwc);
3098 dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
3099 dwc->ep0_bounce, dwc->ep0_bounce_addr);
3100
3101err3:
3102 kfree(dwc->setup_buf);
3103
3104err2:
3105 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3106 dwc->ep0_trb, dwc->ep0_trb_addr);
3107
3108err1:
3109 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
3110 dwc->ctrl_req, dwc->ctrl_req_addr);
3111
3112err0:
3113 return ret;
3114}
3115
3116/* -------------------------------------------------------------------------- */
3117
3118void dwc3_gadget_exit(struct dwc3 *dwc)
3119{
3120 usb_del_gadget_udc(&dwc->gadget);
3121
3122 dwc3_gadget_free_endpoints(dwc);
3123
3124 dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
3125 dwc->ep0_bounce, dwc->ep0_bounce_addr);
3126
3127 kfree(dwc->setup_buf);
3128 kfree(dwc->zlp_buf);
3129
3130 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3131 dwc->ep0_trb, dwc->ep0_trb_addr);
3132
3133 dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
3134 dwc->ctrl_req, dwc->ctrl_req_addr);
3135}
3136
3137int dwc3_gadget_suspend(struct dwc3 *dwc)
3138{
3139 int ret;
3140
3141 if (!dwc->gadget_driver)
3142 return 0;
3143
3144 ret = dwc3_gadget_run_stop(dwc, false, false);
3145 if (ret < 0)
3146 return ret;
3147
3148 dwc3_disconnect_gadget(dwc);
3149 __dwc3_gadget_stop(dwc);
3150
3151 return 0;
3152}
3153
3154int dwc3_gadget_resume(struct dwc3 *dwc)
3155{
3156 int ret;
3157
3158 if (!dwc->gadget_driver)
3159 return 0;
3160
3161 ret = __dwc3_gadget_start(dwc);
3162 if (ret < 0)
3163 goto err0;
3164
3165 ret = dwc3_gadget_run_stop(dwc, true, false);
3166 if (ret < 0)
3167 goto err1;
3168
3169 return 0;
3170
3171err1:
3172 __dwc3_gadget_stop(dwc);
3173
3174err0:
3175 return ret;
3176}
3177
3178void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
3179{
3180 if (dwc->pending_events) {
3181 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
3182 dwc->pending_events = false;
3183 enable_irq(dwc->irq_gadget);
3184 }
3185}