?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / usb / gadget / udc / bdc / bdc_ep.c
blobd6199507f86140b15439463f97f234aa7955d6fe
1 /*
2 * bdc_ep.c - BRCM BDC USB3.0 device controller endpoint related functions
3 *
4 * Copyright (C) 2014 Broadcom Corporation
5 *
6 * Author: Ashwini Pahuja
7 *
8 * Based on drivers under drivers/usb/
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 */
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/dmapool.h>
22 #include <linux/ioport.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/timer.h>
28 #include <linux/list.h>
29 #include <linux/interrupt.h>
30 #include <linux/moduleparam.h>
31 #include <linux/device.h>
32 #include <linux/usb/ch9.h>
33 #include <linux/usb/gadget.h>
34 #include <linux/usb/otg.h>
35 #include <linux/pm.h>
36 #include <linux/io.h>
37 #include <linux/irq.h>
38 #include <asm/unaligned.h>
39 #include <linux/platform_device.h>
40 #include <linux/usb/composite.h>
41
42 #include "bdc.h"
43 #include "bdc_ep.h"
44 #include "bdc_cmd.h"
45 #include "bdc_dbg.h"
46
47 static const char * const ep0_state_string[] = {
48 "WAIT_FOR_SETUP",
49 "WAIT_FOR_DATA_START",
50 "WAIT_FOR_DATA_XMIT",
51 "WAIT_FOR_STATUS_START",
52 "WAIT_FOR_STATUS_XMIT",
53 "STATUS_PENDING"
54 };
55
56 /* Free the bdl during ep disable */
57 static void ep_bd_list_free(struct bdc_ep *ep, u32 num_tabs)
58 {
59 struct bd_list *bd_list = &ep->bd_list;
60 struct bdc *bdc = ep->bdc;
61 struct bd_table *bd_table;
62 int index;
63
64 dev_dbg(bdc->dev, "%s ep:%s num_tabs:%d\n",
65 __func__, ep->name, num_tabs);
66
67 if (!bd_list->bd_table_array) {
68 dev_dbg(bdc->dev, "%s already freed\n", ep->name);
69 return;
70 }
71 for (index = 0; index < num_tabs; index++) {
72 /*
73 * check if the bd_table struct is allocated ?
74 * if yes, then check if bd memory has been allocated, then
75 * free the dma_pool and also the bd_table struct memory
76 */
77 bd_table = bd_list->bd_table_array[index];
78 dev_dbg(bdc->dev, "bd_table:%p index:%d\n", bd_table, index);
79 if (!bd_table) {
80 dev_dbg(bdc->dev, "bd_table not allocated\n");
81 continue;
82 }
83 if (!bd_table->start_bd) {
84 dev_dbg(bdc->dev, "bd dma pool not allocted\n");
85 continue;
86 }
87
88 dev_dbg(bdc->dev,
89 "Free dma pool start_bd:%p dma:%llx\n",
90 bd_table->start_bd,
91 (unsigned long long)bd_table->dma);
92
93 dma_pool_free(bdc->bd_table_pool,
94 bd_table->start_bd,
95 bd_table->dma);
96 /* Free the bd_table structure */
97 kfree(bd_table);
98 }
99 /* Free the bd table array */
100 kfree(ep->bd_list.bd_table_array);
101 }
102
103 /*
104 * chain the tables, by insteting a chain bd at the end of prev_table, pointing
105 * to next_table
106 */
107 static inline void chain_table(struct bd_table *prev_table,
108 struct bd_table *next_table,
109 u32 bd_p_tab)
110 {
111 /* Chain the prev table to next table */
112 prev_table->start_bd[bd_p_tab-1].offset[0] =
113 cpu_to_le32(lower_32_bits(next_table->dma));
114
115 prev_table->start_bd[bd_p_tab-1].offset[1] =
116 cpu_to_le32(upper_32_bits(next_table->dma));
117
118 prev_table->start_bd[bd_p_tab-1].offset[2] =
119 0x0;
120
121 prev_table->start_bd[bd_p_tab-1].offset[3] =
122 cpu_to_le32(MARK_CHAIN_BD);
123 }
124
125 /* Allocate the bdl for ep, during config ep */
126 static int ep_bd_list_alloc(struct bdc_ep *ep)
127 {
128 struct bd_table *prev_table = NULL;
129 int index, num_tabs, bd_p_tab;
130 struct bdc *bdc = ep->bdc;
131 struct bd_table *bd_table;
132 dma_addr_t dma;
133
134 if (usb_endpoint_xfer_isoc(ep->desc))
135 num_tabs = NUM_TABLES_ISOCH;
136 else
137 num_tabs = NUM_TABLES;
138
139 bd_p_tab = NUM_BDS_PER_TABLE;
140 /* if there is only 1 table in bd list then loop chain to self */
141 dev_dbg(bdc->dev,
142 "%s ep:%p num_tabs:%d\n",
143 __func__, ep, num_tabs);
144
145 /* Allocate memory for table array */
146 ep->bd_list.bd_table_array = kzalloc(
147 num_tabs * sizeof(struct bd_table *),
148 GFP_ATOMIC);
149 if (!ep->bd_list.bd_table_array)
150 return -ENOMEM;
151
152 /* Allocate memory for each table */
153 for (index = 0; index < num_tabs; index++) {
154 /* Allocate memory for bd_table structure */
155 bd_table = kzalloc(sizeof(struct bd_table), GFP_ATOMIC);
156 if (!bd_table)
157 goto fail;
158
159 bd_table->start_bd = dma_pool_alloc(bdc->bd_table_pool,
160 GFP_ATOMIC,
161 &dma);
162 if (!bd_table->start_bd) {
163 kfree(bd_table);
164 goto fail;
165 }
166
167 bd_table->dma = dma;
168
169 dev_dbg(bdc->dev,
170 "index:%d start_bd:%p dma=%08llx prev_table:%p\n",
171 index, bd_table->start_bd,
172 (unsigned long long)bd_table->dma, prev_table);
173
174 ep->bd_list.bd_table_array[index] = bd_table;
175 memset(bd_table->start_bd, 0, bd_p_tab * sizeof(struct bdc_bd));
176 if (prev_table)
177 chain_table(prev_table, bd_table, bd_p_tab);
178
179 prev_table = bd_table;
180 }
181 chain_table(prev_table, ep->bd_list.bd_table_array[0], bd_p_tab);
182 /* Memory allocation is successful, now init the internal fields */
183 ep->bd_list.num_tabs = num_tabs;
184 ep->bd_list.max_bdi = (num_tabs * bd_p_tab) - 1;
185 ep->bd_list.num_tabs = num_tabs;
186 ep->bd_list.num_bds_table = bd_p_tab;
187 ep->bd_list.eqp_bdi = 0;
188 ep->bd_list.hwd_bdi = 0;
189
190 return 0;
191 fail:
192 /* Free the bd_table_array, bd_table struct, bd's */
193 ep_bd_list_free(ep, num_tabs);
194
195 return -ENOMEM;
196 }
197
198 /* returns how many bd's are need for this transfer */
199 static inline int bd_needed_req(struct bdc_req *req)
200 {
201 int bd_needed = 0;
202 int remaining;
203
204 /* 1 bd needed for 0 byte transfer */
205 if (req->usb_req.length == 0)
206 return 1;
207
208 /* remaining bytes after tranfering all max BD size BD's */
209 remaining = req->usb_req.length % BD_MAX_BUFF_SIZE;
210 if (remaining)
211 bd_needed++;
212
213 /* How many maximum BUFF size BD's ? */
214 remaining = req->usb_req.length / BD_MAX_BUFF_SIZE;
215 bd_needed += remaining;
216
217 return bd_needed;
218 }
219
220 /* returns the bd index(bdi) corresponding to bd dma address */
221 static int bd_add_to_bdi(struct bdc_ep *ep, dma_addr_t bd_dma_addr)
222 {
223 struct bd_list *bd_list = &ep->bd_list;
224 dma_addr_t dma_first_bd, dma_last_bd;
225 struct bdc *bdc = ep->bdc;
226 struct bd_table *bd_table;
227 bool found = false;
228 int tbi, bdi;
229
230 dma_first_bd = dma_last_bd = 0;
231 dev_dbg(bdc->dev, "%s %llx\n",
232 __func__, (unsigned long long)bd_dma_addr);
233 /*
234 * Find in which table this bd_dma_addr belongs?, go through the table
235 * array and compare addresses of first and last address of bd of each
236 * table
237 */
238 for (tbi = 0; tbi < bd_list->num_tabs; tbi++) {
239 bd_table = bd_list->bd_table_array[tbi];
240 dma_first_bd = bd_table->dma;
241 dma_last_bd = bd_table->dma +
242 (sizeof(struct bdc_bd) *
243 (bd_list->num_bds_table - 1));
244 dev_dbg(bdc->dev, "dma_first_bd:%llx dma_last_bd:%llx\n",
245 (unsigned long long)dma_first_bd,
246 (unsigned long long)dma_last_bd);
247 if (bd_dma_addr >= dma_first_bd && bd_dma_addr <= dma_last_bd) {
248 found = true;
249 break;
250 }
251 }
252 if (unlikely(!found)) {
253 dev_err(bdc->dev, "%s FATAL err, bd not found\n", __func__);
254 return -EINVAL;
255 }
256 /* Now we know the table, find the bdi */
257 bdi = (bd_dma_addr - dma_first_bd) / sizeof(struct bdc_bd);
258
259 /* return the global bdi, to compare with ep eqp_bdi */
260 return (bdi + (tbi * bd_list->num_bds_table));
261 }
262
263 /* returns the table index(tbi) of the given bdi */
264 static int bdi_to_tbi(struct bdc_ep *ep, int bdi)
265 {
266 int tbi;
267
268 tbi = bdi / ep->bd_list.num_bds_table;
269 dev_vdbg(ep->bdc->dev,
270 "bdi:%d num_bds_table:%d tbi:%d\n",
271 bdi, ep->bd_list.num_bds_table, tbi);
272
273 return tbi;
274 }
275
276 /* Find the bdi last bd in the transfer */
277 static inline int find_end_bdi(struct bdc_ep *ep, int next_hwd_bdi)
278 {
279 int end_bdi;
280
281 end_bdi = next_hwd_bdi - 1;
282 if (end_bdi < 0)
283 end_bdi = ep->bd_list.max_bdi - 1;
284 else if ((end_bdi % (ep->bd_list.num_bds_table-1)) == 0)
285 end_bdi--;
286
287 return end_bdi;
288 }
289
290 /*
291 * How many transfer bd's are available on this ep bdl, chain bds are not
292 * counted in available bds
293 */
294 static int bd_available_ep(struct bdc_ep *ep)
295 {
296 struct bd_list *bd_list = &ep->bd_list;
297 int available1, available2;
298 struct bdc *bdc = ep->bdc;
299 int chain_bd1, chain_bd2;
300 int available_bd = 0;
301
302 available1 = available2 = chain_bd1 = chain_bd2 = 0;
303 /* if empty then we have all bd's available - number of chain bd's */
304 if (bd_list->eqp_bdi == bd_list->hwd_bdi)
305 return bd_list->max_bdi - bd_list->num_tabs;
306
307 /*
308 * Depending upon where eqp and dqp pointers are, caculate number
309 * of avaialble bd's
310 */
311 if (bd_list->hwd_bdi < bd_list->eqp_bdi) {
312 /* available bd's are from eqp..max_bds + 0..dqp - chain_bds */
313 available1 = bd_list->max_bdi - bd_list->eqp_bdi;
314 available2 = bd_list->hwd_bdi;
315 chain_bd1 = available1 / bd_list->num_bds_table;
316 chain_bd2 = available2 / bd_list->num_bds_table;
317 dev_vdbg(bdc->dev, "chain_bd1:%d chain_bd2:%d\n",
318 chain_bd1, chain_bd2);
319 available_bd = available1 + available2 - chain_bd1 - chain_bd2;
320 } else {
321 /* available bd's are from eqp..dqp - number of chain bd's */
322 available1 = bd_list->hwd_bdi - bd_list->eqp_bdi;
323 /* if gap between eqp and dqp is less than NUM_BDS_PER_TABLE */
324 if ((bd_list->hwd_bdi - bd_list->eqp_bdi)
325 <= bd_list->num_bds_table) {
326 /* If there any chain bd in between */
327 if (!(bdi_to_tbi(ep, bd_list->hwd_bdi)
328 == bdi_to_tbi(ep, bd_list->eqp_bdi))) {
329 available_bd = available1 - 1;
330 }
331 } else {
332 chain_bd1 = available1 / bd_list->num_bds_table;
333 available_bd = available1 - chain_bd1;
334 }
335 }
336 /*
337 * we need to keep one extra bd to check if ring is full or empty so
338 * reduce by 1
339 */
340 available_bd--;
341 dev_vdbg(bdc->dev, "available_bd:%d\n", available_bd);
342
343 return available_bd;
344 }
345
346 /* Notify the hardware after queueing the bd to bdl */
347 void bdc_notify_xfr(struct bdc *bdc, u32 epnum)
348 {
349 struct bdc_ep *ep = bdc->bdc_ep_array[epnum];
350
351 dev_vdbg(bdc->dev, "%s epnum:%d\n", __func__, epnum);
352 /*
353 * We don't have anyway to check if ep state is running,
354 * except the software flags.
355 */
356 if (unlikely(ep->flags & BDC_EP_STOP))
357 ep->flags &= ~BDC_EP_STOP;
358
359 bdc_writel(bdc->regs, BDC_XSFNTF, epnum);
360 }
361
362 /* returns the bd corresponding to bdi */
363 static struct bdc_bd *bdi_to_bd(struct bdc_ep *ep, int bdi)
364 {
365 int tbi = bdi_to_tbi(ep, bdi);
366 int local_bdi = 0;
367
368 local_bdi = bdi - (tbi * ep->bd_list.num_bds_table);
369 dev_vdbg(ep->bdc->dev,
370 "%s bdi:%d local_bdi:%d\n",
371 __func__, bdi, local_bdi);
372
373 return (ep->bd_list.bd_table_array[tbi]->start_bd + local_bdi);
374 }
375
376 /* Advance the enqueue pointer */
377 static void ep_bdlist_eqp_adv(struct bdc_ep *ep)
378 {
379 ep->bd_list.eqp_bdi++;
380 /* if it's chain bd, then move to next */
381 if (((ep->bd_list.eqp_bdi + 1) % ep->bd_list.num_bds_table) == 0)
382 ep->bd_list.eqp_bdi++;
383
384 /* if the eqp is pointing to last + 1 then move back to 0 */
385 if (ep->bd_list.eqp_bdi == (ep->bd_list.max_bdi + 1))
386 ep->bd_list.eqp_bdi = 0;
387 }
388
389 /* Setup the first bd for ep0 transfer */
390 static int setup_first_bd_ep0(struct bdc *bdc, struct bdc_req *req, u32 *dword3)
391 {
392 u16 wValue;
393 u32 req_len;
394
395 req->ep->dir = 0;
396 req_len = req->usb_req.length;
397 switch (bdc->ep0_state) {
398 case WAIT_FOR_DATA_START:
399 *dword3 |= BD_TYPE_DS;
400 if (bdc->setup_pkt.bRequestType & USB_DIR_IN)
401 *dword3 |= BD_DIR_IN;
402
403 /* check if zlp will be needed */
404 wValue = le16_to_cpu(bdc->setup_pkt.wValue);
405 if ((wValue > req_len) &&
406 (req_len % bdc->gadget.ep0->maxpacket == 0)) {
407 dev_dbg(bdc->dev, "ZLP needed wVal:%d len:%d MaxP:%d\n",
408 wValue, req_len,
409 bdc->gadget.ep0->maxpacket);
410 bdc->zlp_needed = true;
411 }
412 break;
413
414 case WAIT_FOR_STATUS_START:
415 *dword3 |= BD_TYPE_SS;
416 if (!le16_to_cpu(bdc->setup_pkt.wLength) ||
417 !(bdc->setup_pkt.bRequestType & USB_DIR_IN))
418 *dword3 |= BD_DIR_IN;
419 break;
420 default:
421 dev_err(bdc->dev,
422 "Unknown ep0 state for queueing bd ep0_state:%s\n",
423 ep0_state_string[bdc->ep0_state]);
424 return -EINVAL;
425 }
426
427 return 0;
428 }
429
430 /* Setup the bd dma descriptor for a given request */
431 static int setup_bd_list_xfr(struct bdc *bdc, struct bdc_req *req, int num_bds)
432 {
433 dma_addr_t buf_add = req->usb_req.dma;
434 u32 maxp, tfs, dword2, dword3;
435 struct bd_transfer *bd_xfr;
436 struct bd_list *bd_list;
437 struct bdc_ep *ep;
438 struct bdc_bd *bd;
439 int ret, bdnum;
440 u32 req_len;
441
442 ep = req->ep;
443 bd_list = &ep->bd_list;
444 bd_xfr = &req->bd_xfr;
445 bd_xfr->req = req;
446 bd_xfr->start_bdi = bd_list->eqp_bdi;
447 bd = bdi_to_bd(ep, bd_list->eqp_bdi);
448 req_len = req->usb_req.length;
449 maxp = usb_endpoint_maxp(ep->desc) & 0x7ff;
450 tfs = roundup(req->usb_req.length, maxp);
451 tfs = tfs/maxp;
452 dev_vdbg(bdc->dev, "%s ep:%s num_bds:%d tfs:%d r_len:%d bd:%p\n",
453 __func__, ep->name, num_bds, tfs, req_len, bd);
454
455 for (bdnum = 0; bdnum < num_bds; bdnum++) {
456 dword2 = dword3 = 0;
457 /* First bd */
458 if (!bdnum) {
459 dword3 |= BD_SOT|BD_SBF|(tfs<<BD_TFS_SHIFT);
460 dword2 |= BD_LTF;
461 /* format of first bd for ep0 is different than other */
462 if (ep->ep_num == 1) {
463 ret = setup_first_bd_ep0(bdc, req, &dword3);
464 if (ret)
465 return ret;
466 }
467 }
468 if (!req->ep->dir)
469 dword3 |= BD_ISP;
470
471 if (req_len > BD_MAX_BUFF_SIZE) {
472 dword2 |= BD_MAX_BUFF_SIZE;
473 req_len -= BD_MAX_BUFF_SIZE;
474 } else {
475 /* this should be the last bd */
476 dword2 |= req_len;
477 dword3 |= BD_IOC;
478 dword3 |= BD_EOT;
479 }
480 /* Currently only 1 INT target is supported */
481 dword2 |= BD_INTR_TARGET(0);
482 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
483 if (unlikely(!bd)) {
484 dev_err(bdc->dev, "Err bd pointing to wrong addr\n");
485 return -EINVAL;
486 }
487 /* write bd */
488 bd->offset[0] = cpu_to_le32(lower_32_bits(buf_add));
489 bd->offset[1] = cpu_to_le32(upper_32_bits(buf_add));
490 bd->offset[2] = cpu_to_le32(dword2);
491 bd->offset[3] = cpu_to_le32(dword3);
492 /* advance eqp pointer */
493 ep_bdlist_eqp_adv(ep);
494 /* advance the buff pointer */
495 buf_add += BD_MAX_BUFF_SIZE;
496 dev_vdbg(bdc->dev, "buf_add:%08llx req_len:%d bd:%p eqp:%d\n",
497 (unsigned long long)buf_add, req_len, bd,
498 ep->bd_list.eqp_bdi);
499 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
500 bd->offset[3] = cpu_to_le32(BD_SBF);
501 }
502 /* clear the STOP BD fetch bit from the first bd of this xfr */
503 bd = bdi_to_bd(ep, bd_xfr->start_bdi);
504 bd->offset[3] &= cpu_to_le32(~BD_SBF);
505 /* the new eqp will be next hw dqp */
506 bd_xfr->num_bds = num_bds;
507 bd_xfr->next_hwd_bdi = ep->bd_list.eqp_bdi;
508 /* everything is written correctly before notifying the HW */
509 wmb();
510
511 return 0;
512 }
513
514 /* Queue the xfr */
515 static int bdc_queue_xfr(struct bdc *bdc, struct bdc_req *req)
516 {
517 int num_bds, bd_available;
518 struct bdc_ep *ep;
519 int ret;
520
521 ep = req->ep;
522 dev_dbg(bdc->dev, "%s req:%p\n", __func__, req);
523 dev_dbg(bdc->dev, "eqp_bdi:%d hwd_bdi:%d\n",
524 ep->bd_list.eqp_bdi, ep->bd_list.hwd_bdi);
525
526 num_bds = bd_needed_req(req);
527 bd_available = bd_available_ep(ep);
528
529 /* how many bd's are avaialble on ep */
530 if (num_bds > bd_available)
531 return -ENOMEM;
532
533 ret = setup_bd_list_xfr(bdc, req, num_bds);
534 if (ret)
535 return ret;
536 list_add_tail(&req->queue, &ep->queue);
537 bdc_dbg_bd_list(bdc, ep);
538 bdc_notify_xfr(bdc, ep->ep_num);
539
540 return 0;
541 }
542
543 /* callback to gadget layer when xfr completes */
544 static void bdc_req_complete(struct bdc_ep *ep, struct bdc_req *req,
545 int status)
546 {
547 struct bdc *bdc = ep->bdc;
548
549 if (req == NULL || &req->queue == NULL || &req->usb_req == NULL)
550 return;
551
552 dev_dbg(bdc->dev, "%s ep:%s status:%d\n", __func__, ep->name, status);
553 list_del(&req->queue);
554 req->usb_req.status = status;
555 usb_gadget_unmap_request(&bdc->gadget, &req->usb_req, ep->dir);
556 if (req->usb_req.complete) {
557 spin_unlock(&bdc->lock);
558 usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
559 spin_lock(&bdc->lock);
560 }
561 }
562
563 /* Disable the endpoint */
564 int bdc_ep_disable(struct bdc_ep *ep)
565 {
566 struct bdc_req *req;
567 struct bdc *bdc;
568 int ret;
569
570 ret = 0;
571 bdc = ep->bdc;
572 dev_dbg(bdc->dev, "%s() ep->ep_num=%d\n", __func__, ep->ep_num);
573 /* Stop the endpoint */
574 ret = bdc_stop_ep(bdc, ep->ep_num);
575
576 /*
577 * Intentionally don't check the ret value of stop, it can fail in
578 * disconnect scenarios, continue with dconfig
579 */
580 /* de-queue any pending requests */
581 while (!list_empty(&ep->queue)) {
582 req = list_entry(ep->queue.next, struct bdc_req,
583 queue);
584 bdc_req_complete(ep, req, -ESHUTDOWN);
585 }
586 /* deconfigure the endpoint */
587 ret = bdc_dconfig_ep(bdc, ep);
588 if (ret)
589 dev_warn(bdc->dev,
590 "dconfig fail but continue with memory free");
591
592 ep->flags = 0;
593 /* ep0 memory is not freed, but reused on next connect sr */
594 if (ep->ep_num == 1)
595 return 0;
596
597 /* Free the bdl memory */
598 ep_bd_list_free(ep, ep->bd_list.num_tabs);
599 ep->desc = NULL;
600 ep->comp_desc = NULL;
601 ep->usb_ep.desc = NULL;
602 ep->ep_type = 0;
603
604 return ret;
605 }
606
607 /* Enable the ep */
608 int bdc_ep_enable(struct bdc_ep *ep)
609 {
610 struct bdc *bdc;
611 int ret = 0;
612
613 bdc = ep->bdc;
614 dev_dbg(bdc->dev, "%s NUM_TABLES:%d %d\n",
615 __func__, NUM_TABLES, NUM_TABLES_ISOCH);
616
617 ret = ep_bd_list_alloc(ep);
618 if (ret) {
619 dev_err(bdc->dev, "ep bd list allocation failed:%d\n", ret);
620 return -ENOMEM;
621 }
622 bdc_dbg_bd_list(bdc, ep);
623 /* only for ep0: config ep is called for ep0 from connect event */
624 ep->flags |= BDC_EP_ENABLED;
625 if (ep->ep_num == 1)
626 return ret;
627
628 /* Issue a configure endpoint command */
629 ret = bdc_config_ep(bdc, ep);
630 if (ret)
631 return ret;
632
633 ep->usb_ep.maxpacket = usb_endpoint_maxp(ep->desc);
634 ep->usb_ep.desc = ep->desc;
635 ep->usb_ep.comp_desc = ep->comp_desc;
636 ep->ep_type = usb_endpoint_type(ep->desc);
637 ep->flags |= BDC_EP_ENABLED;
638
639 return 0;
640 }
641
642 /* EP0 related code */
643
644 /* Queue a status stage BD */
645 static int ep0_queue_status_stage(struct bdc *bdc)
646 {
647 struct bdc_req *status_req;
648 struct bdc_ep *ep;
649
650 status_req = &bdc->status_req;
651 ep = bdc->bdc_ep_array[1];
652 status_req->ep = ep;
653 status_req->usb_req.length = 0;
654 status_req->usb_req.status = -EINPROGRESS;
655 status_req->usb_req.actual = 0;
656 status_req->usb_req.complete = NULL;
657 bdc_queue_xfr(bdc, status_req);
658
659 return 0;
660 }
661
662 /* Queue xfr on ep0 */
663 static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
664 {
665 struct bdc *bdc;
666 int ret;
667
668 bdc = ep->bdc;
669 dev_dbg(bdc->dev, "%s()\n", __func__);
670 req->usb_req.actual = 0;
671 req->usb_req.status = -EINPROGRESS;
672 req->epnum = ep->ep_num;
673
674 if (bdc->delayed_status) {
675 bdc->delayed_status = false;
676 /* if status stage was delayed? */
677 if (bdc->ep0_state == WAIT_FOR_STATUS_START) {
678 /* Queue a status stage BD */
679 ep0_queue_status_stage(bdc);
680 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
681 return 0;
682 }
683 } else {
684 /*
685 * if delayed status is false and 0 length transfer is requested
686 * i.e. for status stage of some setup request, then just
687 * return from here the status stage is queued independently
688 */
689 if (req->usb_req.length == 0)
690 return 0;
691
692 }
693 ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
694 if (ret) {
695 dev_err(bdc->dev, "dma mapping failed %s\n", ep->name);
696 return ret;
697 }
698
699 return bdc_queue_xfr(bdc, req);
700 }
701
702 /* Queue data stage */
703 static int ep0_queue_data_stage(struct bdc *bdc)
704 {
705 struct usb_request *ep0_usb_req;
706 struct bdc_ep *ep;
707
708 dev_dbg(bdc->dev, "%s\n", __func__);
709 ep0_usb_req = &bdc->ep0_req.usb_req;
710 ep = bdc->bdc_ep_array[1];
711 bdc->ep0_req.ep = ep;
712 bdc->ep0_req.usb_req.complete = NULL;
713
714 return ep0_queue(ep, &bdc->ep0_req);
715 }
716
717 /* Queue req on ep */
718 static int ep_queue(struct bdc_ep *ep, struct bdc_req *req)
719 {
720 struct bdc *bdc;
721 int ret = 0;
722
723 if (!req || !ep->usb_ep.desc)
724 return -EINVAL;
725
726 bdc = ep->bdc;
727
728 req->usb_req.actual = 0;
729 req->usb_req.status = -EINPROGRESS;
730 req->epnum = ep->ep_num;
731
732 ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
733 if (ret) {
734 dev_err(bdc->dev, "dma mapping failed\n");
735 return ret;
736 }
737
738 return bdc_queue_xfr(bdc, req);
739 }
740
741 /* Dequeue a request from ep */
742 static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
743 {
744 int start_bdi, end_bdi, tbi, eqp_bdi, curr_hw_dqpi;
745 bool start_pending, end_pending;
746 bool first_remove = false;
747 struct bdc_req *first_req;
748 struct bdc_bd *bd_start;
749 struct bd_table *table;
750 dma_addr_t next_bd_dma;
751 u64 deq_ptr_64 = 0;
752 struct bdc *bdc;
753 u32 tmp_32;
754 int ret;
755
756 bdc = ep->bdc;
757 start_pending = end_pending = false;
758 eqp_bdi = ep->bd_list.eqp_bdi - 1;
759
760 if (eqp_bdi < 0)
761 eqp_bdi = ep->bd_list.max_bdi;
762
763 start_bdi = req->bd_xfr.start_bdi;
764 end_bdi = find_end_bdi(ep, req->bd_xfr.next_hwd_bdi);
765
766 dev_dbg(bdc->dev, "%s ep:%s start:%d end:%d\n",
767 __func__, ep->name, start_bdi, end_bdi);
768 dev_dbg(bdc->dev, "ep_dequeue ep=%p ep->desc=%p\n",
769 ep, (void *)ep->usb_ep.desc);
770 /* Stop the ep to see where the HW is ? */
771 ret = bdc_stop_ep(bdc, ep->ep_num);
772 /* if there is an issue with stopping ep, then no need to go further */
773 if (ret)
774 return 0;
775
776 /*
777 * After endpoint is stopped, there can be 3 cases, the request
778 * is processed, pending or in the middle of processing
779 */
780
781 /* The current hw dequeue pointer */
782 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(0));
783 deq_ptr_64 = tmp_32;
784 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1(0));
785 deq_ptr_64 |= ((u64)tmp_32 << 32);
786
787 /* we have the dma addr of next bd that will be fetched by hardware */
788 curr_hw_dqpi = bd_add_to_bdi(ep, deq_ptr_64);
789 if (curr_hw_dqpi < 0)
790 return curr_hw_dqpi;
791
792 /*
793 * curr_hw_dqpi points to actual dqp of HW and HW owns bd's from
794 * curr_hw_dqbdi..eqp_bdi.
795 */
796
797 /* Check if start_bdi and end_bdi are in range of HW owned BD's */
798 if (curr_hw_dqpi > eqp_bdi) {
799 /* there is a wrap from last to 0 */
800 if (start_bdi >= curr_hw_dqpi || start_bdi <= eqp_bdi) {
801 start_pending = true;
802 end_pending = true;
803 } else if (end_bdi >= curr_hw_dqpi || end_bdi <= eqp_bdi) {
804 end_pending = true;
805 }
806 } else {
807 if (start_bdi >= curr_hw_dqpi) {
808 start_pending = true;
809 end_pending = true;
810 } else if (end_bdi >= curr_hw_dqpi) {
811 end_pending = true;
812 }
813 }
814 dev_dbg(bdc->dev,
815 "start_pending:%d end_pending:%d speed:%d\n",
816 start_pending, end_pending, bdc->gadget.speed);
817
818 /* If both start till end are processes, we cannot deq req */
819 if (!start_pending && !end_pending)
820 return -EINVAL;
821
822 /*
823 * if ep_dequeue is called after disconnect then just return
824 * success from here
825 */
826 if (bdc->gadget.speed == USB_SPEED_UNKNOWN)
827 return 0;
828 tbi = bdi_to_tbi(ep, req->bd_xfr.next_hwd_bdi);
829 table = ep->bd_list.bd_table_array[tbi];
830 next_bd_dma = table->dma +
831 sizeof(struct bdc_bd)*(req->bd_xfr.next_hwd_bdi -
832 tbi * ep->bd_list.num_bds_table);
833
834 first_req = list_first_entry(&ep->queue, struct bdc_req,
835 queue);
836
837 if (req == first_req)
838 first_remove = true;
839
840 /*
841 * Due to HW limitation we need to bypadd chain bd's and issue ep_bla,
842 * incase if start is pending this is the first request in the list
843 * then issue ep_bla instead of marking as chain bd
844 */
845 if (start_pending && !first_remove) {
846 /*
847 * Mark the start bd as Chain bd, and point the chain
848 * bd to next_bd_dma
849 */
850 bd_start = bdi_to_bd(ep, start_bdi);
851 bd_start->offset[0] = cpu_to_le32(lower_32_bits(next_bd_dma));
852 bd_start->offset[1] = cpu_to_le32(upper_32_bits(next_bd_dma));
853 bd_start->offset[2] = 0x0;
854 bd_start->offset[3] = cpu_to_le32(MARK_CHAIN_BD);
855 bdc_dbg_bd_list(bdc, ep);
856 } else if (end_pending) {
857 /*
858 * The transfer is stopped in the middle, move the
859 * HW deq pointer to next_bd_dma
860 */
861 ret = bdc_ep_bla(bdc, ep, next_bd_dma);
862 if (ret) {
863 dev_err(bdc->dev, "error in ep_bla:%d\n", ret);
864 return ret;
865 }
866 }
867
868 return 0;
869 }
870
871 /* Halt/Clear the ep based on value */
872 static int ep_set_halt(struct bdc_ep *ep, u32 value)
873 {
874 struct bdc *bdc;
875 int ret;
876
877 bdc = ep->bdc;
878 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
879
880 if (value) {
881 dev_dbg(bdc->dev, "Halt\n");
882 if (ep->ep_num == 1)
883 bdc->ep0_state = WAIT_FOR_SETUP;
884
885 ret = bdc_ep_set_stall(bdc, ep->ep_num);
886 if (ret)
887 dev_err(bdc->dev, "failed to set STALL on %s\n",
888 ep->name);
889 else
890 ep->flags |= BDC_EP_STALL;
891 } else {
892 /* Clear */
893 dev_dbg(bdc->dev, "Before Clear\n");
894 ret = bdc_ep_clear_stall(bdc, ep->ep_num);
895 if (ret)
896 dev_err(bdc->dev, "failed to clear STALL on %s\n",
897 ep->name);
898 else
899 ep->flags &= ~BDC_EP_STALL;
900 dev_dbg(bdc->dev, "After Clear\n");
901 }
902
903 return ret;
904 }
905
906 /* Free all the ep */
907 void bdc_free_ep(struct bdc *bdc)
908 {
909 struct bdc_ep *ep;
910 u8 epnum;
911
912 dev_dbg(bdc->dev, "%s\n", __func__);
913 for (epnum = 1; epnum < bdc->num_eps; epnum++) {
914 ep = bdc->bdc_ep_array[epnum];
915 if (!ep)
916 continue;
917
918 if (ep->flags & BDC_EP_ENABLED)
919 ep_bd_list_free(ep, ep->bd_list.num_tabs);
920
921 /* ep0 is not in this gadget list */
922 if (epnum != 1)
923 list_del(&ep->usb_ep.ep_list);
924
925 kfree(ep);
926 }
927 }
928
929 /* USB2 spec, section 7.1.20 */
930 static int bdc_set_test_mode(struct bdc *bdc)
931 {
932 u32 usb2_pm;
933
934 usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
935 usb2_pm &= ~BDC_PTC_MASK;
936 dev_dbg(bdc->dev, "%s\n", __func__);
937 switch (bdc->test_mode) {
938 case TEST_J:
939 case TEST_K:
940 case TEST_SE0_NAK:
941 case TEST_PACKET:
942 case TEST_FORCE_EN:
943 usb2_pm |= bdc->test_mode << 28;
944 break;
945 default:
946 return -EINVAL;
947 }
948 dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
949 bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
950
951 return 0;
952 }
953
954 /*
955 * Helper function to handle Transfer status report with status as either
956 * success or short
957 */
958 static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep,
959 struct bdc_sr *sreport)
960 {
961 int short_bdi, start_bdi, end_bdi, max_len_bds, chain_bds;
962 struct bd_list *bd_list = &ep->bd_list;
963 int actual_length, length_short;
964 struct bd_transfer *bd_xfr;
965 struct bdc_bd *short_bd;
966 struct bdc_req *req;
967 u64 deq_ptr_64 = 0;
968 int status = 0;
969 int sr_status;
970 u32 tmp_32;
971
972 dev_dbg(bdc->dev, "%s ep:%p\n", __func__, ep);
973 bdc_dbg_srr(bdc, 0);
974 /* do not process thie sr if ignore flag is set */
975 if (ep->ignore_next_sr) {
976 ep->ignore_next_sr = false;
977 return;
978 }
979
980 if (unlikely(list_empty(&ep->queue))) {
981 dev_warn(bdc->dev, "xfr srr with no BD's queued\n");
982 return;
983 }
984 req = list_entry(ep->queue.next, struct bdc_req,
985 queue);
986
987 bd_xfr = &req->bd_xfr;
988 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
989
990 /*
991 * sr_status is short and this transfer has more than 1 bd then it needs
992 * special handling, this is only applicable for bulk and ctrl
993 */
994 if (sr_status == XSF_SHORT && bd_xfr->num_bds > 1) {
995 /*
996 * This is multi bd xfr, lets see which bd
997 * caused short transfer and how many bytes have been
998 * transferred so far.
999 */
1000 tmp_32 = le32_to_cpu(sreport->offset[0]);
1001 deq_ptr_64 = tmp_32;
1002 tmp_32 = le32_to_cpu(sreport->offset[1]);
1003 deq_ptr_64 |= ((u64)tmp_32 << 32);
1004 short_bdi = bd_add_to_bdi(ep, deq_ptr_64);
1005 if (unlikely(short_bdi < 0))
1006 dev_warn(bdc->dev, "bd doesn't exist?\n");
1007
1008 start_bdi = bd_xfr->start_bdi;
1009 /*
1010 * We know the start_bdi and short_bdi, how many xfr
1011 * bds in between
1012 */
1013 if (start_bdi <= short_bdi) {
1014 max_len_bds = short_bdi - start_bdi;
1015 if (max_len_bds <= bd_list->num_bds_table) {
1016 if (!(bdi_to_tbi(ep, start_bdi) ==
1017 bdi_to_tbi(ep, short_bdi)))
1018 max_len_bds--;
1019 } else {
1020 chain_bds = max_len_bds/bd_list->num_bds_table;
1021 max_len_bds -= chain_bds;
1022 }
1023 } else {
1024 /* there is a wrap in the ring within a xfr */
1025 chain_bds = (bd_list->max_bdi - start_bdi)/
1026 bd_list->num_bds_table;
1027 chain_bds += short_bdi/bd_list->num_bds_table;
1028 max_len_bds = bd_list->max_bdi - start_bdi;
1029 max_len_bds += short_bdi;
1030 max_len_bds -= chain_bds;
1031 }
1032 /* max_len_bds is the number of full length bds */
1033 end_bdi = find_end_bdi(ep, bd_xfr->next_hwd_bdi);
1034 if (!(end_bdi == short_bdi))
1035 ep->ignore_next_sr = true;
1036
1037 actual_length = max_len_bds * BD_MAX_BUFF_SIZE;
1038 short_bd = bdi_to_bd(ep, short_bdi);
1039 /* length queued */
1040 length_short = le32_to_cpu(short_bd->offset[2]) & 0x1FFFFF;
1041 /* actual length trensfered */
1042 length_short -= SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1043 actual_length += length_short;
1044 req->usb_req.actual = actual_length;
1045 } else {
1046 req->usb_req.actual = req->usb_req.length -
1047 SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1048 dev_dbg(bdc->dev,
1049 "len=%d actual=%d bd_xfr->next_hwd_bdi:%d\n",
1050 req->usb_req.length, req->usb_req.actual,
1051 bd_xfr->next_hwd_bdi);
1052 }
1053
1054 /* Update the dequeue pointer */
1055 ep->bd_list.hwd_bdi = bd_xfr->next_hwd_bdi;
1056 if (req->usb_req.actual < req->usb_req.length) {
1057 dev_dbg(bdc->dev, "short xfr on %d\n", ep->ep_num);
1058 if (req->usb_req.short_not_ok)
1059 status = -EREMOTEIO;
1060 }
1061 bdc_req_complete(ep, bd_xfr->req, status);
1062 }
1063
1064 /* EP0 setup related packet handlers */
1065
1066 /*
1067 * Setup packet received, just store the packet and process on next DS or SS
1068 * started SR
1069 */
1070 void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport)
1071 {
1072 struct usb_ctrlrequest *setup_pkt;
1073 u32 len;
1074
1075 dev_dbg(bdc->dev,
1076 "%s ep0_state:%s\n",
1077 __func__, ep0_state_string[bdc->ep0_state]);
1078 /* Store received setup packet */
1079 setup_pkt = &bdc->setup_pkt;
1080 memcpy(setup_pkt, &sreport->offset[0], sizeof(*setup_pkt));
1081 len = le16_to_cpu(setup_pkt->wLength);
1082 if (!len)
1083 bdc->ep0_state = WAIT_FOR_STATUS_START;
1084 else
1085 bdc->ep0_state = WAIT_FOR_DATA_START;
1086
1087
1088 dev_dbg(bdc->dev,
1089 "%s exit ep0_state:%s\n",
1090 __func__, ep0_state_string[bdc->ep0_state]);
1091 }
1092
1093 /* Stall ep0 */
1094 static void ep0_stall(struct bdc *bdc)
1095 {
1096 struct bdc_ep *ep = bdc->bdc_ep_array[1];
1097 struct bdc_req *req;
1098
1099 dev_dbg(bdc->dev, "%s\n", __func__);
1100 bdc->delayed_status = false;
1101 ep_set_halt(ep, 1);
1102
1103 /* de-queue any pendig requests */
1104 while (!list_empty(&ep->queue)) {
1105 req = list_entry(ep->queue.next, struct bdc_req,
1106 queue);
1107 bdc_req_complete(ep, req, -ESHUTDOWN);
1108 }
1109 }
1110
1111 /* SET_ADD handlers */
1112 static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl)
1113 {
1114 enum usb_device_state state = bdc->gadget.state;
1115 int ret = 0;
1116 u32 addr;
1117
1118 addr = le16_to_cpu(ctrl->wValue);
1119 dev_dbg(bdc->dev,
1120 "%s addr:%d dev state:%d\n",
1121 __func__, addr, state);
1122
1123 if (addr > 127)
1124 return -EINVAL;
1125
1126 switch (state) {
1127 case USB_STATE_DEFAULT:
1128 case USB_STATE_ADDRESS:
1129 /* Issue Address device command */
1130 ret = bdc_address_device(bdc, addr);
1131 if (ret)
1132 return ret;
1133
1134 if (addr)
1135 usb_gadget_set_state(&bdc->gadget, USB_STATE_ADDRESS);
1136 else
1137 usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
1138
1139 bdc->dev_addr = addr;
1140 break;
1141 default:
1142 dev_warn(bdc->dev,
1143 "SET Address in wrong device state %d\n",
1144 state);
1145 ret = -EINVAL;
1146 }
1147
1148 return ret;
1149 }
1150
1151 /* Handler for SET/CLEAR FEATURE requests for device */
1152 static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue,
1153 u16 wIndex, bool set)
1154 {
1155 enum usb_device_state state = bdc->gadget.state;
1156 u32 usppms = 0;
1157
1158 dev_dbg(bdc->dev, "%s set:%d dev state:%d\n",
1159 __func__, set, state);
1160 switch (wValue) {
1161 case USB_DEVICE_REMOTE_WAKEUP:
1162 dev_dbg(bdc->dev, "USB_DEVICE_REMOTE_WAKEUP\n");
1163 if (set)
1164 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1165 else
1166 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1167 break;
1168
1169 case USB_DEVICE_TEST_MODE:
1170 dev_dbg(bdc->dev, "USB_DEVICE_TEST_MODE\n");
1171 if ((wIndex & 0xFF) ||
1172 (bdc->gadget.speed != USB_SPEED_HIGH) || !set)
1173 return -EINVAL;
1174
1175 bdc->test_mode = wIndex >> 8;
1176 break;
1177
1178 case USB_DEVICE_U1_ENABLE:
1179 dev_dbg(bdc->dev, "USB_DEVICE_U1_ENABLE\n");
1180
1181 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1182 state != USB_STATE_CONFIGURED)
1183 return -EINVAL;
1184
1185 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1186 if (set) {
1187 /* clear previous u1t */
1188 usppms &= ~BDC_U1T(BDC_U1T_MASK);
1189 usppms |= BDC_U1T(U1_TIMEOUT);
1190 usppms |= BDC_U1E | BDC_PORT_W1S;
1191 bdc->devstatus |= (1 << USB_DEV_STAT_U1_ENABLED);
1192 } else {
1193 usppms &= ~BDC_U1E;
1194 usppms |= BDC_PORT_W1S;
1195 bdc->devstatus &= ~(1 << USB_DEV_STAT_U1_ENABLED);
1196 }
1197 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1198 break;
1199
1200 case USB_DEVICE_U2_ENABLE:
1201 dev_dbg(bdc->dev, "USB_DEVICE_U2_ENABLE\n");
1202
1203 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1204 state != USB_STATE_CONFIGURED)
1205 return -EINVAL;
1206
1207 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1208 if (set) {
1209 usppms |= BDC_U2E;
1210 usppms |= BDC_U2A;
1211 bdc->devstatus |= (1 << USB_DEV_STAT_U2_ENABLED);
1212 } else {
1213 usppms &= ~BDC_U2E;
1214 usppms &= ~BDC_U2A;
1215 bdc->devstatus &= ~(1 << USB_DEV_STAT_U2_ENABLED);
1216 }
1217 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1218 break;
1219
1220 case USB_DEVICE_LTM_ENABLE:
1221 dev_dbg(bdc->dev, "USB_DEVICE_LTM_ENABLE?\n");
1222 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1223 state != USB_STATE_CONFIGURED)
1224 return -EINVAL;
1225 break;
1226 default:
1227 dev_err(bdc->dev, "Unknown wValue:%d\n", wValue);
1228 return -EOPNOTSUPP;
1229 } /* USB_RECIP_DEVICE end */
1230
1231 return 0;
1232 }
1233
1234 /* SET/CLEAR FEATURE handler */
1235 static int ep0_handle_feature(struct bdc *bdc,
1236 struct usb_ctrlrequest *setup_pkt, bool set)
1237 {
1238 enum usb_device_state state = bdc->gadget.state;
1239 struct bdc_ep *ep;
1240 u16 wValue;
1241 u16 wIndex;
1242 int epnum;
1243
1244 wValue = le16_to_cpu(setup_pkt->wValue);
1245 wIndex = le16_to_cpu(setup_pkt->wIndex);
1246
1247 dev_dbg(bdc->dev,
1248 "%s wValue=%d wIndex=%d devstate=%08x speed=%d set=%d",
1249 __func__, wValue, wIndex, state,
1250 bdc->gadget.speed, set);
1251
1252 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1253 case USB_RECIP_DEVICE:
1254 return ep0_handle_feature_dev(bdc, wValue, wIndex, set);
1255 case USB_RECIP_INTERFACE:
1256 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1257 /* USB3 spec, sec 9.4.9 */
1258 if (wValue != USB_INTRF_FUNC_SUSPEND)
1259 return -EINVAL;
1260 /* USB3 spec, Table 9-8 */
1261 if (set) {
1262 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) {
1263 dev_dbg(bdc->dev, "SET REMOTE_WAKEUP\n");
1264 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1265 } else {
1266 dev_dbg(bdc->dev, "CLEAR REMOTE_WAKEUP\n");
1267 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1268 }
1269 }
1270 break;
1271
1272 case USB_RECIP_ENDPOINT:
1273 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1274 if (wValue != USB_ENDPOINT_HALT)
1275 return -EINVAL;
1276
1277 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1278 if (epnum) {
1279 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1280 epnum = epnum * 2 + 1;
1281 else
1282 epnum *= 2;
1283 } else {
1284 epnum = 1; /*EP0*/
1285 }
1286 /*
1287 * If CLEAR_FEATURE on ep0 then don't do anything as the stall
1288 * condition on ep0 has already been cleared when SETUP packet
1289 * was received.
1290 */
1291 if (epnum == 1 && !set) {
1292 dev_dbg(bdc->dev, "ep0 stall already cleared\n");
1293 return 0;
1294 }
1295 dev_dbg(bdc->dev, "epnum=%d\n", epnum);
1296 ep = bdc->bdc_ep_array[epnum];
1297 if (!ep)
1298 return -EINVAL;
1299
1300 return ep_set_halt(ep, set);
1301 default:
1302 dev_err(bdc->dev, "Unknown recipient\n");
1303 return -EINVAL;
1304 }
1305
1306 return 0;
1307 }
1308
1309 /* GET_STATUS request handler */
1310 static int ep0_handle_status(struct bdc *bdc,
1311 struct usb_ctrlrequest *setup_pkt)
1312 {
1313 enum usb_device_state state = bdc->gadget.state;
1314 struct bdc_ep *ep;
1315 u16 usb_status = 0;
1316 u32 epnum;
1317 u16 wIndex;
1318
1319 /* USB2.0 spec sec 9.4.5 */
1320 if (state == USB_STATE_DEFAULT)
1321 return -EINVAL;
1322 wIndex = le16_to_cpu(setup_pkt->wIndex);
1323 dev_dbg(bdc->dev, "%s\n", __func__);
1324 usb_status = bdc->devstatus;
1325 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1326 case USB_RECIP_DEVICE:
1327 dev_dbg(bdc->dev,
1328 "USB_RECIP_DEVICE devstatus:%08x\n",
1329 bdc->devstatus);
1330 /* USB3 spec, sec 9.4.5 */
1331 if (bdc->gadget.speed == USB_SPEED_SUPER)
1332 usb_status &= ~REMOTE_WAKE_ENABLE;
1333 break;
1334
1335 case USB_RECIP_INTERFACE:
1336 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1337 if (bdc->gadget.speed == USB_SPEED_SUPER) {
1338 /*
1339 * This should come from func for Func remote wkup
1340 * usb_status |=1;
1341 */
1342 if (bdc->devstatus & REMOTE_WAKE_ENABLE)
1343 usb_status |= REMOTE_WAKE_ENABLE;
1344 } else {
1345 usb_status = 0;
1346 }
1347
1348 break;
1349
1350 case USB_RECIP_ENDPOINT:
1351 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1352 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1353 if (epnum) {
1354 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1355 epnum = epnum*2 + 1;
1356 else
1357 epnum *= 2;
1358 } else {
1359 epnum = 1; /* EP0 */
1360 }
1361
1362 ep = bdc->bdc_ep_array[epnum];
1363 if (!ep) {
1364 dev_err(bdc->dev, "ISSUE, GET_STATUS for invalid EP ?");
1365 return -EINVAL;
1366 }
1367 if (ep->flags & BDC_EP_STALL)
1368 usb_status |= 1 << USB_ENDPOINT_HALT;
1369
1370 break;
1371 default:
1372 dev_err(bdc->dev, "Unknown recipient for get_status\n");
1373 return -EINVAL;
1374 }
1375 /* prepare a data stage for GET_STATUS */
1376 dev_dbg(bdc->dev, "usb_status=%08x\n", usb_status);
1377 *(__le16 *)bdc->ep0_response_buff = cpu_to_le16(usb_status);
1378 bdc->ep0_req.usb_req.length = 2;
1379 bdc->ep0_req.usb_req.buf = &bdc->ep0_response_buff;
1380 ep0_queue_data_stage(bdc);
1381
1382 return 0;
1383 }
1384
1385 static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req)
1386 {
1387 /* ep0_set_sel_cmpl */
1388 }
1389
1390 /* Queue data stage to handle 6 byte SET_SEL request */
1391 static int ep0_set_sel(struct bdc *bdc,
1392 struct usb_ctrlrequest *setup_pkt)
1393 {
1394 struct bdc_ep *ep;
1395 u16 wLength;
1396 u16 wValue;
1397
1398 dev_dbg(bdc->dev, "%s\n", __func__);
1399 wValue = le16_to_cpu(setup_pkt->wValue);
1400 wLength = le16_to_cpu(setup_pkt->wLength);
1401 if (unlikely(wLength != 6)) {
1402 dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
1403 return -EINVAL;
1404 }
1405 ep = bdc->bdc_ep_array[1];
1406 bdc->ep0_req.ep = ep;
1407 bdc->ep0_req.usb_req.length = 6;
1408 bdc->ep0_req.usb_req.buf = bdc->ep0_response_buff;
1409 bdc->ep0_req.usb_req.complete = ep0_set_sel_cmpl;
1410 ep0_queue_data_stage(bdc);
1411
1412 return 0;
1413 }
1414
1415 /*
1416 * Queue a 0 byte bd only if wLength is more than the length and and length is
1417 * a multiple of MaxPacket then queue 0 byte BD
1418 */
1419 static int ep0_queue_zlp(struct bdc *bdc)
1420 {
1421 int ret;
1422
1423 dev_dbg(bdc->dev, "%s\n", __func__);
1424 bdc->ep0_req.ep = bdc->bdc_ep_array[1];
1425 bdc->ep0_req.usb_req.length = 0;
1426 bdc->ep0_req.usb_req.complete = NULL;
1427 bdc->ep0_state = WAIT_FOR_DATA_START;
1428 ret = bdc_queue_xfr(bdc, &bdc->ep0_req);
1429 if (ret) {
1430 dev_err(bdc->dev, "err queueing zlp :%d\n", ret);
1431 return ret;
1432 }
1433 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1434
1435 return 0;
1436 }
1437
1438 /* Control request handler */
1439 static int handle_control_request(struct bdc *bdc)
1440 {
1441 enum usb_device_state state = bdc->gadget.state;
1442 struct usb_ctrlrequest *setup_pkt;
1443 int delegate_setup = 0;
1444 int ret = 0;
1445 int config = 0;
1446
1447 setup_pkt = &bdc->setup_pkt;
1448 dev_dbg(bdc->dev, "%s\n", __func__);
1449 if ((setup_pkt->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1450 switch (setup_pkt->bRequest) {
1451 case USB_REQ_SET_ADDRESS:
1452 dev_dbg(bdc->dev, "USB_REQ_SET_ADDRESS\n");
1453 ret = ep0_set_address(bdc, setup_pkt);
1454 bdc->devstatus &= DEVSTATUS_CLEAR;
1455 break;
1456
1457 case USB_REQ_SET_CONFIGURATION:
1458 dev_dbg(bdc->dev, "USB_REQ_SET_CONFIGURATION\n");
1459 if (state == USB_STATE_ADDRESS) {
1460 usb_gadget_set_state(&bdc->gadget,
1461 USB_STATE_CONFIGURED);
1462 } else if (state == USB_STATE_CONFIGURED) {
1463 /*
1464 * USB2 spec sec 9.4.7, if wValue is 0 then dev
1465 * is moved to addressed state
1466 */
1467 config = le16_to_cpu(setup_pkt->wValue);
1468 if (!config)
1469 usb_gadget_set_state(
1470 &bdc->gadget,
1471 USB_STATE_ADDRESS);
1472 }
1473 delegate_setup = 1;
1474 break;
1475
1476 case USB_REQ_SET_FEATURE:
1477 dev_dbg(bdc->dev, "USB_REQ_SET_FEATURE\n");
1478 ret = ep0_handle_feature(bdc, setup_pkt, 1);
1479 break;
1480
1481 case USB_REQ_CLEAR_FEATURE:
1482 dev_dbg(bdc->dev, "USB_REQ_CLEAR_FEATURE\n");
1483 ret = ep0_handle_feature(bdc, setup_pkt, 0);
1484 break;
1485
1486 case USB_REQ_GET_STATUS:
1487 dev_dbg(bdc->dev, "USB_REQ_GET_STATUS\n");
1488 ret = ep0_handle_status(bdc, setup_pkt);
1489 break;
1490
1491 case USB_REQ_SET_SEL:
1492 dev_dbg(bdc->dev, "USB_REQ_SET_SEL\n");
1493 ret = ep0_set_sel(bdc, setup_pkt);
1494 break;
1495
1496 case USB_REQ_SET_ISOCH_DELAY:
1497 dev_warn(bdc->dev,
1498 "USB_REQ_SET_ISOCH_DELAY not handled\n");
1499 ret = 0;
1500 break;
1501 default:
1502 delegate_setup = 1;
1503 }
1504 } else {
1505 delegate_setup = 1;
1506 }
1507
1508 if (delegate_setup) {
1509 spin_unlock(&bdc->lock);
1510 ret = bdc->gadget_driver->setup(&bdc->gadget, setup_pkt);
1511 spin_lock(&bdc->lock);
1512 }
1513
1514 return ret;
1515 }
1516
1517 /* EP0: Data stage started */
1518 void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport)
1519 {
1520 struct bdc_ep *ep;
1521 int ret = 0;
1522
1523 dev_dbg(bdc->dev, "%s\n", __func__);
1524 ep = bdc->bdc_ep_array[1];
1525 /* If ep0 was stalled, the clear it first */
1526 if (ep->flags & BDC_EP_STALL) {
1527 ret = ep_set_halt(ep, 0);
1528 if (ret)
1529 goto err;
1530 }
1531 if (bdc->ep0_state != WAIT_FOR_DATA_START)
1532 dev_warn(bdc->dev,
1533 "Data stage not expected ep0_state:%s\n",
1534 ep0_state_string[bdc->ep0_state]);
1535
1536 ret = handle_control_request(bdc);
1537 if (ret == USB_GADGET_DELAYED_STATUS) {
1538 /*
1539 * The ep0 state will remain WAIT_FOR_DATA_START till
1540 * we received ep_queue on ep0
1541 */
1542 bdc->delayed_status = true;
1543 return;
1544 }
1545 if (!ret) {
1546 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1547 dev_dbg(bdc->dev,
1548 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1549 return;
1550 }
1551 err:
1552 ep0_stall(bdc);
1553 }
1554
1555 /* EP0: status stage started */
1556 void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport)
1557 {
1558 struct usb_ctrlrequest *setup_pkt;
1559 struct bdc_ep *ep;
1560 int ret = 0;
1561
1562 dev_dbg(bdc->dev,
1563 "%s ep0_state:%s",
1564 __func__, ep0_state_string[bdc->ep0_state]);
1565 ep = bdc->bdc_ep_array[1];
1566
1567 /* check if ZLP was queued? */
1568 if (bdc->zlp_needed)
1569 bdc->zlp_needed = false;
1570
1571 if (ep->flags & BDC_EP_STALL) {
1572 ret = ep_set_halt(ep, 0);
1573 if (ret)
1574 goto err;
1575 }
1576
1577 if ((bdc->ep0_state != WAIT_FOR_STATUS_START) &&
1578 (bdc->ep0_state != WAIT_FOR_DATA_XMIT))
1579 dev_err(bdc->dev,
1580 "Status stage recv but ep0_state:%s\n",
1581 ep0_state_string[bdc->ep0_state]);
1582
1583 /* check if data stage is in progress ? */
1584 if (bdc->ep0_state == WAIT_FOR_DATA_XMIT) {
1585 bdc->ep0_state = STATUS_PENDING;
1586 /* Status stage will be queued upon Data stage transmit event */
1587 dev_dbg(bdc->dev,
1588 "status started but data not transmitted yet\n");
1589 return;
1590 }
1591 setup_pkt = &bdc->setup_pkt;
1592
1593 /*
1594 * 2 stage setup then only process the setup, for 3 stage setup the date
1595 * stage is already handled
1596 */
1597 if (!le16_to_cpu(setup_pkt->wLength)) {
1598 ret = handle_control_request(bdc);
1599 if (ret == USB_GADGET_DELAYED_STATUS) {
1600 bdc->delayed_status = true;
1601 /* ep0_state will remain WAIT_FOR_STATUS_START */
1602 return;
1603 }
1604 }
1605 if (!ret) {
1606 /* Queue a status stage BD */
1607 ep0_queue_status_stage(bdc);
1608 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
1609 dev_dbg(bdc->dev,
1610 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1611 return;
1612 }
1613 err:
1614 ep0_stall(bdc);
1615 }
1616
1617 /* Helper function to update ep0 upon SR with xsf_succ or xsf_short */
1618 static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport)
1619 {
1620 dev_dbg(bdc->dev, "%s\n", __func__);
1621 switch (bdc->ep0_state) {
1622 case WAIT_FOR_DATA_XMIT:
1623 bdc->ep0_state = WAIT_FOR_STATUS_START;
1624 break;
1625 case WAIT_FOR_STATUS_XMIT:
1626 bdc->ep0_state = WAIT_FOR_SETUP;
1627 if (bdc->test_mode) {
1628 int ret;
1629
1630 dev_dbg(bdc->dev, "test_mode:%d\n", bdc->test_mode);
1631 ret = bdc_set_test_mode(bdc);
1632 if (ret < 0) {
1633 dev_err(bdc->dev, "Err in setting Test mode\n");
1634 return;
1635 }
1636 bdc->test_mode = 0;
1637 }
1638 break;
1639 case STATUS_PENDING:
1640 bdc_xsf_ep0_status_start(bdc, sreport);
1641 break;
1642
1643 default:
1644 dev_err(bdc->dev,
1645 "Unknown ep0_state:%s\n",
1646 ep0_state_string[bdc->ep0_state]);
1647
1648 }
1649 }
1650
1651 /* xfr completion status report handler */
1652 void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport)
1653 {
1654 struct bdc_ep *ep;
1655 u32 sr_status;
1656 u8 ep_num;
1657
1658 ep_num = (le32_to_cpu(sreport->offset[3])>>4) & 0x1f;
1659 ep = bdc->bdc_ep_array[ep_num];
1660 if (!ep || !(ep->flags & BDC_EP_ENABLED)) {
1661 dev_err(bdc->dev, "xsf for ep not enabled\n");
1662 return;
1663 }
1664 /*
1665 * check if this transfer is after link went from U3->U0 due
1666 * to remote wakeup
1667 */
1668 if (bdc->devstatus & FUNC_WAKE_ISSUED) {
1669 bdc->devstatus &= ~(FUNC_WAKE_ISSUED);
1670 dev_dbg(bdc->dev, "%s clearing FUNC_WAKE_ISSUED flag\n",
1671 __func__);
1672 }
1673 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
1674 dev_dbg_ratelimited(bdc->dev, "%s sr_status=%d ep:%s\n",
1675 __func__, sr_status, ep->name);
1676
1677 switch (sr_status) {
1678 case XSF_SUCC:
1679 case XSF_SHORT:
1680 handle_xsr_succ_status(bdc, ep, sreport);
1681 if (ep_num == 1)
1682 ep0_xsf_complete(bdc, sreport);
1683 break;
1684
1685 case XSF_SETUP_RECV:
1686 case XSF_DATA_START:
1687 case XSF_STATUS_START:
1688 if (ep_num != 1) {
1689 dev_err(bdc->dev,
1690 "ep0 related packets on non ep0 endpoint");
1691 return;
1692 }
1693 bdc->sr_xsf_ep0[sr_status - XSF_SETUP_RECV](bdc, sreport);
1694 break;
1695
1696 case XSF_BABB:
1697 if (ep_num == 1) {
1698 dev_dbg(bdc->dev, "Babble on ep0 zlp_need:%d\n",
1699 bdc->zlp_needed);
1700 /*
1701 * If the last completed transfer had wLength >Data Len,
1702 * and Len is multiple of MaxPacket,then queue ZLP
1703 */
1704 if (bdc->zlp_needed) {
1705 /* queue 0 length bd */
1706 ep0_queue_zlp(bdc);
1707 return;
1708 }
1709 }
1710 dev_warn(bdc->dev, "Babble on ep not handled\n");
1711 break;
1712 default:
1713 dev_warn(bdc->dev, "sr status not handled:%x\n", sr_status);
1714 break;
1715 }
1716 }
1717
1718 static int bdc_gadget_ep_queue(struct usb_ep *_ep,
1719 struct usb_request *_req, gfp_t gfp_flags)
1720 {
1721 struct bdc_req *req;
1722 unsigned long flags;
1723 struct bdc_ep *ep;
1724 struct bdc *bdc;
1725 int ret;
1726
1727 if (!_ep || !_ep->desc)
1728 return -ESHUTDOWN;
1729
1730 if (!_req || !_req->complete || !_req->buf)
1731 return -EINVAL;
1732
1733 ep = to_bdc_ep(_ep);
1734 req = to_bdc_req(_req);
1735 bdc = ep->bdc;
1736 dev_dbg(bdc->dev, "%s ep:%p req:%p\n", __func__, ep, req);
1737 dev_dbg(bdc->dev, "queuing request %p to %s length %d zero:%d\n",
1738 _req, ep->name, _req->length, _req->zero);
1739
1740 if (!ep->usb_ep.desc) {
1741 dev_warn(bdc->dev,
1742 "trying to queue req %p to disabled %s\n",
1743 _req, ep->name);
1744 return -ESHUTDOWN;
1745 }
1746
1747 if (_req->length > MAX_XFR_LEN) {
1748 dev_warn(bdc->dev,
1749 "req length > supported MAX:%d requested:%d\n",
1750 MAX_XFR_LEN, _req->length);
1751 return -EOPNOTSUPP;
1752 }
1753 spin_lock_irqsave(&bdc->lock, flags);
1754 if (ep == bdc->bdc_ep_array[1])
1755 ret = ep0_queue(ep, req);
1756 else
1757 ret = ep_queue(ep, req);
1758
1759 spin_unlock_irqrestore(&bdc->lock, flags);
1760
1761 return ret;
1762 }
1763
1764 static int bdc_gadget_ep_dequeue(struct usb_ep *_ep,
1765 struct usb_request *_req)
1766 {
1767 struct bdc_req *req;
1768 unsigned long flags;
1769 struct bdc_ep *ep;
1770 struct bdc *bdc;
1771 int ret;
1772
1773 if (!_ep || !_req)
1774 return -EINVAL;
1775
1776 ep = to_bdc_ep(_ep);
1777 req = to_bdc_req(_req);
1778 bdc = ep->bdc;
1779 dev_dbg(bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1780 bdc_dbg_bd_list(bdc, ep);
1781 spin_lock_irqsave(&bdc->lock, flags);
1782 /* make sure it's still queued on this endpoint */
1783 list_for_each_entry(req, &ep->queue, queue) {
1784 if (&req->usb_req == _req)
1785 break;
1786 }
1787 if (&req->usb_req != _req) {
1788 spin_unlock_irqrestore(&bdc->lock, flags);
1789 dev_err(bdc->dev, "usb_req !=req n");
1790 return -EINVAL;
1791 }
1792 ret = ep_dequeue(ep, req);
1793 if (ret) {
1794 ret = -EOPNOTSUPP;
1795 goto err;
1796 }
1797 bdc_req_complete(ep, req, -ECONNRESET);
1798
1799 err:
1800 bdc_dbg_bd_list(bdc, ep);
1801 spin_unlock_irqrestore(&bdc->lock, flags);
1802
1803 return ret;
1804 }
1805
1806 static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value)
1807 {
1808 unsigned long flags;
1809 struct bdc_ep *ep;
1810 struct bdc *bdc;
1811 int ret;
1812
1813 ep = to_bdc_ep(_ep);
1814 bdc = ep->bdc;
1815 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
1816 spin_lock_irqsave(&bdc->lock, flags);
1817 if (usb_endpoint_xfer_isoc(ep->usb_ep.desc))
1818 ret = -EINVAL;
1819 else if (!list_empty(&ep->queue))
1820 ret = -EAGAIN;
1821 else
1822 ret = ep_set_halt(ep, value);
1823
1824 spin_unlock_irqrestore(&bdc->lock, flags);
1825
1826 return ret;
1827 }
1828
1829 static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep,
1830 gfp_t gfp_flags)
1831 {
1832 struct bdc_req *req;
1833 struct bdc_ep *ep;
1834
1835 req = kzalloc(sizeof(*req), gfp_flags);
1836 if (!req)
1837 return NULL;
1838
1839 ep = to_bdc_ep(_ep);
1840 req->ep = ep;
1841 req->epnum = ep->ep_num;
1842 req->usb_req.dma = DMA_ADDR_INVALID;
1843 dev_dbg(ep->bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1844
1845 return &req->usb_req;
1846 }
1847
1848 static void bdc_gadget_free_request(struct usb_ep *_ep,
1849 struct usb_request *_req)
1850 {
1851 struct bdc_req *req;
1852
1853 req = to_bdc_req(_req);
1854 kfree(req);
1855 }
1856
1857 /* endpoint operations */
1858
1859 /* configure endpoint and also allocate resources */
1860 static int bdc_gadget_ep_enable(struct usb_ep *_ep,
1861 const struct usb_endpoint_descriptor *desc)
1862 {
1863 unsigned long flags;
1864 struct bdc_ep *ep;
1865 struct bdc *bdc;
1866 int ret;
1867
1868 if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1869 pr_debug("bdc_gadget_ep_enable invalid parameters\n");
1870 return -EINVAL;
1871 }
1872
1873 if (!desc->wMaxPacketSize) {
1874 pr_debug("bdc_gadget_ep_enable missing wMaxPacketSize\n");
1875 return -EINVAL;
1876 }
1877
1878 ep = to_bdc_ep(_ep);
1879 bdc = ep->bdc;
1880
1881 /* Sanity check, upper layer will not send enable for ep0 */
1882 if (ep == bdc->bdc_ep_array[1])
1883 return -EINVAL;
1884
1885 if (!bdc->gadget_driver
1886 || bdc->gadget.speed == USB_SPEED_UNKNOWN) {
1887 return -ESHUTDOWN;
1888 }
1889
1890 dev_dbg(bdc->dev, "%s Enabling %s\n", __func__, ep->name);
1891 spin_lock_irqsave(&bdc->lock, flags);
1892 ep->desc = desc;
1893 ep->comp_desc = _ep->comp_desc;
1894 ret = bdc_ep_enable(ep);
1895 spin_unlock_irqrestore(&bdc->lock, flags);
1896
1897 return ret;
1898 }
1899
1900 static int bdc_gadget_ep_disable(struct usb_ep *_ep)
1901 {
1902 unsigned long flags;
1903 struct bdc_ep *ep;
1904 struct bdc *bdc;
1905 int ret;
1906
1907 if (!_ep) {
1908 pr_debug("bdc: invalid parameters\n");
1909 return -EINVAL;
1910 }
1911 ep = to_bdc_ep(_ep);
1912 bdc = ep->bdc;
1913
1914 /* Upper layer will not call this for ep0, but do a sanity check */
1915 if (ep == bdc->bdc_ep_array[1]) {
1916 dev_warn(bdc->dev, "%s called for ep0\n", __func__);
1917 return -EINVAL;
1918 }
1919 dev_dbg(bdc->dev,
1920 "%s() ep:%s ep->flags:%08x\n",
1921 __func__, ep->name, ep->flags);
1922
1923 if (!(ep->flags & BDC_EP_ENABLED)) {
1924 dev_warn(bdc->dev, "%s is already disabled\n", ep->name);
1925 return 0;
1926 }
1927 spin_lock_irqsave(&bdc->lock, flags);
1928 ret = bdc_ep_disable(ep);
1929 spin_unlock_irqrestore(&bdc->lock, flags);
1930
1931 return ret;
1932 }
1933
1934 static const struct usb_ep_ops bdc_gadget_ep_ops = {
1935 .enable = bdc_gadget_ep_enable,
1936 .disable = bdc_gadget_ep_disable,
1937 .alloc_request = bdc_gadget_alloc_request,
1938 .free_request = bdc_gadget_free_request,
1939 .queue = bdc_gadget_ep_queue,
1940 .dequeue = bdc_gadget_ep_dequeue,
1941 .set_halt = bdc_gadget_ep_set_halt
1942 };
1943
1944 /* dir = 1 is IN */
1945 static int init_ep(struct bdc *bdc, u32 epnum, u32 dir)
1946 {
1947 struct bdc_ep *ep;
1948
1949 dev_dbg(bdc->dev, "%s epnum=%d dir=%d\n", __func__, epnum, dir);
1950 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1951 if (!ep)
1952 return -ENOMEM;
1953
1954 ep->bdc = bdc;
1955 ep->dir = dir;
1956
1957 if (dir)
1958 ep->usb_ep.caps.dir_in = true;
1959 else
1960 ep->usb_ep.caps.dir_out = true;
1961
1962 /* ep->ep_num is the index inside bdc_ep */
1963 if (epnum == 1) {
1964 ep->ep_num = 1;
1965 bdc->bdc_ep_array[ep->ep_num] = ep;
1966 snprintf(ep->name, sizeof(ep->name), "ep%d", epnum - 1);
1967 usb_ep_set_maxpacket_limit(&ep->usb_ep, EP0_MAX_PKT_SIZE);
1968 ep->usb_ep.caps.type_control = true;
1969 ep->comp_desc = NULL;
1970 bdc->gadget.ep0 = &ep->usb_ep;
1971 } else {
1972 if (dir)
1973 ep->ep_num = epnum * 2 - 1;
1974 else
1975 ep->ep_num = epnum * 2 - 2;
1976
1977 bdc->bdc_ep_array[ep->ep_num] = ep;
1978 snprintf(ep->name, sizeof(ep->name), "ep%d%s", epnum - 1,
1979 dir & 1 ? "in" : "out");
1980
1981 usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
1982 ep->usb_ep.caps.type_iso = true;
1983 ep->usb_ep.caps.type_bulk = true;
1984 ep->usb_ep.caps.type_int = true;
1985 ep->usb_ep.max_streams = 0;
1986 list_add_tail(&ep->usb_ep.ep_list, &bdc->gadget.ep_list);
1987 }
1988 ep->usb_ep.ops = &bdc_gadget_ep_ops;
1989 ep->usb_ep.name = ep->name;
1990 ep->flags = 0;
1991 ep->ignore_next_sr = false;
1992 dev_dbg(bdc->dev, "ep=%p ep->usb_ep.name=%s epnum=%d ep->epnum=%d\n",
1993 ep, ep->usb_ep.name, epnum, ep->ep_num);
1994
1995 INIT_LIST_HEAD(&ep->queue);
1996
1997 return 0;
1998 }
1999
2000 /* Init all ep */
2001 int bdc_init_ep(struct bdc *bdc)
2002 {
2003 u8 epnum;
2004 int ret;
2005
2006 dev_dbg(bdc->dev, "%s()\n", __func__);
2007 INIT_LIST_HEAD(&bdc->gadget.ep_list);
2008 /* init ep0 */
2009 ret = init_ep(bdc, 1, 0);
2010 if (ret) {
2011 dev_err(bdc->dev, "init ep ep0 fail %d\n", ret);
2012 return ret;
2013 }
2014
2015 for (epnum = 2; epnum <= bdc->num_eps / 2; epnum++) {
2016 /* OUT */
2017 ret = init_ep(bdc, epnum, 0);
2018 if (ret) {
2019 dev_err(bdc->dev,
2020 "init ep failed for:%d error: %d\n",
2021 epnum, ret);
2022 return ret;
2023 }
2024
2025 /* IN */
2026 ret = init_ep(bdc, epnum, 1);
2027 if (ret) {
2028 dev_err(bdc->dev,
2029 "init ep failed for:%d error: %d\n",
2030 epnum, ret);
2031 return ret;
2032 }
2033 }
2034
2035 return 0;
2036 }
Linux with added FPC-III support