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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / gadget / udc / bdc / bdc_ep.c
blobccaa74ab6c0ed5c8bc2a0c10b921745c8d2977a9
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 allocated\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 bdc_ep *ep;
706
707 dev_dbg(bdc->dev, "%s\n", __func__);
708 ep = bdc->bdc_ep_array[1];
709 bdc->ep0_req.ep = ep;
710 bdc->ep0_req.usb_req.complete = NULL;
711
712 return ep0_queue(ep, &bdc->ep0_req);
713 }
714
715 /* Queue req on ep */
716 static int ep_queue(struct bdc_ep *ep, struct bdc_req *req)
717 {
718 struct bdc *bdc;
719 int ret = 0;
720
721 if (!req || !ep->usb_ep.desc)
722 return -EINVAL;
723
724 bdc = ep->bdc;
725
726 req->usb_req.actual = 0;
727 req->usb_req.status = -EINPROGRESS;
728 req->epnum = ep->ep_num;
729
730 ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
731 if (ret) {
732 dev_err(bdc->dev, "dma mapping failed\n");
733 return ret;
734 }
735
736 return bdc_queue_xfr(bdc, req);
737 }
738
739 /* Dequeue a request from ep */
740 static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
741 {
742 int start_bdi, end_bdi, tbi, eqp_bdi, curr_hw_dqpi;
743 bool start_pending, end_pending;
744 bool first_remove = false;
745 struct bdc_req *first_req;
746 struct bdc_bd *bd_start;
747 struct bd_table *table;
748 dma_addr_t next_bd_dma;
749 u64 deq_ptr_64 = 0;
750 struct bdc *bdc;
751 u32 tmp_32;
752 int ret;
753
754 bdc = ep->bdc;
755 start_pending = end_pending = false;
756 eqp_bdi = ep->bd_list.eqp_bdi - 1;
757
758 if (eqp_bdi < 0)
759 eqp_bdi = ep->bd_list.max_bdi;
760
761 start_bdi = req->bd_xfr.start_bdi;
762 end_bdi = find_end_bdi(ep, req->bd_xfr.next_hwd_bdi);
763
764 dev_dbg(bdc->dev, "%s ep:%s start:%d end:%d\n",
765 __func__, ep->name, start_bdi, end_bdi);
766 dev_dbg(bdc->dev, "ep_dequeue ep=%p ep->desc=%p\n",
767 ep, (void *)ep->usb_ep.desc);
768 /* Stop the ep to see where the HW is ? */
769 ret = bdc_stop_ep(bdc, ep->ep_num);
770 /* if there is an issue with stopping ep, then no need to go further */
771 if (ret)
772 return 0;
773
774 /*
775 * After endpoint is stopped, there can be 3 cases, the request
776 * is processed, pending or in the middle of processing
777 */
778
779 /* The current hw dequeue pointer */
780 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(0));
781 deq_ptr_64 = tmp_32;
782 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1(0));
783 deq_ptr_64 |= ((u64)tmp_32 << 32);
784
785 /* we have the dma addr of next bd that will be fetched by hardware */
786 curr_hw_dqpi = bd_add_to_bdi(ep, deq_ptr_64);
787 if (curr_hw_dqpi < 0)
788 return curr_hw_dqpi;
789
790 /*
791 * curr_hw_dqpi points to actual dqp of HW and HW owns bd's from
792 * curr_hw_dqbdi..eqp_bdi.
793 */
794
795 /* Check if start_bdi and end_bdi are in range of HW owned BD's */
796 if (curr_hw_dqpi > eqp_bdi) {
797 /* there is a wrap from last to 0 */
798 if (start_bdi >= curr_hw_dqpi || start_bdi <= eqp_bdi) {
799 start_pending = true;
800 end_pending = true;
801 } else if (end_bdi >= curr_hw_dqpi || end_bdi <= eqp_bdi) {
802 end_pending = true;
803 }
804 } else {
805 if (start_bdi >= curr_hw_dqpi) {
806 start_pending = true;
807 end_pending = true;
808 } else if (end_bdi >= curr_hw_dqpi) {
809 end_pending = true;
810 }
811 }
812 dev_dbg(bdc->dev,
813 "start_pending:%d end_pending:%d speed:%d\n",
814 start_pending, end_pending, bdc->gadget.speed);
815
816 /* If both start till end are processes, we cannot deq req */
817 if (!start_pending && !end_pending)
818 return -EINVAL;
819
820 /*
821 * if ep_dequeue is called after disconnect then just return
822 * success from here
823 */
824 if (bdc->gadget.speed == USB_SPEED_UNKNOWN)
825 return 0;
826 tbi = bdi_to_tbi(ep, req->bd_xfr.next_hwd_bdi);
827 table = ep->bd_list.bd_table_array[tbi];
828 next_bd_dma = table->dma +
829 sizeof(struct bdc_bd)*(req->bd_xfr.next_hwd_bdi -
830 tbi * ep->bd_list.num_bds_table);
831
832 first_req = list_first_entry(&ep->queue, struct bdc_req,
833 queue);
834
835 if (req == first_req)
836 first_remove = true;
837
838 /*
839 * Due to HW limitation we need to bypadd chain bd's and issue ep_bla,
840 * incase if start is pending this is the first request in the list
841 * then issue ep_bla instead of marking as chain bd
842 */
843 if (start_pending && !first_remove) {
844 /*
845 * Mark the start bd as Chain bd, and point the chain
846 * bd to next_bd_dma
847 */
848 bd_start = bdi_to_bd(ep, start_bdi);
849 bd_start->offset[0] = cpu_to_le32(lower_32_bits(next_bd_dma));
850 bd_start->offset[1] = cpu_to_le32(upper_32_bits(next_bd_dma));
851 bd_start->offset[2] = 0x0;
852 bd_start->offset[3] = cpu_to_le32(MARK_CHAIN_BD);
853 bdc_dbg_bd_list(bdc, ep);
854 } else if (end_pending) {
855 /*
856 * The transfer is stopped in the middle, move the
857 * HW deq pointer to next_bd_dma
858 */
859 ret = bdc_ep_bla(bdc, ep, next_bd_dma);
860 if (ret) {
861 dev_err(bdc->dev, "error in ep_bla:%d\n", ret);
862 return ret;
863 }
864 }
865
866 return 0;
867 }
868
869 /* Halt/Clear the ep based on value */
870 static int ep_set_halt(struct bdc_ep *ep, u32 value)
871 {
872 struct bdc *bdc;
873 int ret;
874
875 bdc = ep->bdc;
876 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
877
878 if (value) {
879 dev_dbg(bdc->dev, "Halt\n");
880 if (ep->ep_num == 1)
881 bdc->ep0_state = WAIT_FOR_SETUP;
882
883 ret = bdc_ep_set_stall(bdc, ep->ep_num);
884 if (ret)
885 dev_err(bdc->dev, "failed to set STALL on %s\n",
886 ep->name);
887 else
888 ep->flags |= BDC_EP_STALL;
889 } else {
890 /* Clear */
891 dev_dbg(bdc->dev, "Before Clear\n");
892 ret = bdc_ep_clear_stall(bdc, ep->ep_num);
893 if (ret)
894 dev_err(bdc->dev, "failed to clear STALL on %s\n",
895 ep->name);
896 else
897 ep->flags &= ~BDC_EP_STALL;
898 dev_dbg(bdc->dev, "After Clear\n");
899 }
900
901 return ret;
902 }
903
904 /* Free all the ep */
905 void bdc_free_ep(struct bdc *bdc)
906 {
907 struct bdc_ep *ep;
908 u8 epnum;
909
910 dev_dbg(bdc->dev, "%s\n", __func__);
911 for (epnum = 1; epnum < bdc->num_eps; epnum++) {
912 ep = bdc->bdc_ep_array[epnum];
913 if (!ep)
914 continue;
915
916 if (ep->flags & BDC_EP_ENABLED)
917 ep_bd_list_free(ep, ep->bd_list.num_tabs);
918
919 /* ep0 is not in this gadget list */
920 if (epnum != 1)
921 list_del(&ep->usb_ep.ep_list);
922
923 kfree(ep);
924 }
925 }
926
927 /* USB2 spec, section 7.1.20 */
928 static int bdc_set_test_mode(struct bdc *bdc)
929 {
930 u32 usb2_pm;
931
932 usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
933 usb2_pm &= ~BDC_PTC_MASK;
934 dev_dbg(bdc->dev, "%s\n", __func__);
935 switch (bdc->test_mode) {
936 case TEST_J:
937 case TEST_K:
938 case TEST_SE0_NAK:
939 case TEST_PACKET:
940 case TEST_FORCE_EN:
941 usb2_pm |= bdc->test_mode << 28;
942 break;
943 default:
944 return -EINVAL;
945 }
946 dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
947 bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
948
949 return 0;
950 }
951
952 /*
953 * Helper function to handle Transfer status report with status as either
954 * success or short
955 */
956 static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep,
957 struct bdc_sr *sreport)
958 {
959 int short_bdi, start_bdi, end_bdi, max_len_bds, chain_bds;
960 struct bd_list *bd_list = &ep->bd_list;
961 int actual_length, length_short;
962 struct bd_transfer *bd_xfr;
963 struct bdc_bd *short_bd;
964 struct bdc_req *req;
965 u64 deq_ptr_64 = 0;
966 int status = 0;
967 int sr_status;
968 u32 tmp_32;
969
970 dev_dbg(bdc->dev, "%s ep:%p\n", __func__, ep);
971 bdc_dbg_srr(bdc, 0);
972 /* do not process thie sr if ignore flag is set */
973 if (ep->ignore_next_sr) {
974 ep->ignore_next_sr = false;
975 return;
976 }
977
978 if (unlikely(list_empty(&ep->queue))) {
979 dev_warn(bdc->dev, "xfr srr with no BD's queued\n");
980 return;
981 }
982 req = list_entry(ep->queue.next, struct bdc_req,
983 queue);
984
985 bd_xfr = &req->bd_xfr;
986 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
987
988 /*
989 * sr_status is short and this transfer has more than 1 bd then it needs
990 * special handling, this is only applicable for bulk and ctrl
991 */
992 if (sr_status == XSF_SHORT && bd_xfr->num_bds > 1) {
993 /*
994 * This is multi bd xfr, lets see which bd
995 * caused short transfer and how many bytes have been
996 * transferred so far.
997 */
998 tmp_32 = le32_to_cpu(sreport->offset[0]);
999 deq_ptr_64 = tmp_32;
1000 tmp_32 = le32_to_cpu(sreport->offset[1]);
1001 deq_ptr_64 |= ((u64)tmp_32 << 32);
1002 short_bdi = bd_add_to_bdi(ep, deq_ptr_64);
1003 if (unlikely(short_bdi < 0))
1004 dev_warn(bdc->dev, "bd doesn't exist?\n");
1005
1006 start_bdi = bd_xfr->start_bdi;
1007 /*
1008 * We know the start_bdi and short_bdi, how many xfr
1009 * bds in between
1010 */
1011 if (start_bdi <= short_bdi) {
1012 max_len_bds = short_bdi - start_bdi;
1013 if (max_len_bds <= bd_list->num_bds_table) {
1014 if (!(bdi_to_tbi(ep, start_bdi) ==
1015 bdi_to_tbi(ep, short_bdi)))
1016 max_len_bds--;
1017 } else {
1018 chain_bds = max_len_bds/bd_list->num_bds_table;
1019 max_len_bds -= chain_bds;
1020 }
1021 } else {
1022 /* there is a wrap in the ring within a xfr */
1023 chain_bds = (bd_list->max_bdi - start_bdi)/
1024 bd_list->num_bds_table;
1025 chain_bds += short_bdi/bd_list->num_bds_table;
1026 max_len_bds = bd_list->max_bdi - start_bdi;
1027 max_len_bds += short_bdi;
1028 max_len_bds -= chain_bds;
1029 }
1030 /* max_len_bds is the number of full length bds */
1031 end_bdi = find_end_bdi(ep, bd_xfr->next_hwd_bdi);
1032 if (!(end_bdi == short_bdi))
1033 ep->ignore_next_sr = true;
1034
1035 actual_length = max_len_bds * BD_MAX_BUFF_SIZE;
1036 short_bd = bdi_to_bd(ep, short_bdi);
1037 /* length queued */
1038 length_short = le32_to_cpu(short_bd->offset[2]) & 0x1FFFFF;
1039 /* actual length trensfered */
1040 length_short -= SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1041 actual_length += length_short;
1042 req->usb_req.actual = actual_length;
1043 } else {
1044 req->usb_req.actual = req->usb_req.length -
1045 SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1046 dev_dbg(bdc->dev,
1047 "len=%d actual=%d bd_xfr->next_hwd_bdi:%d\n",
1048 req->usb_req.length, req->usb_req.actual,
1049 bd_xfr->next_hwd_bdi);
1050 }
1051
1052 /* Update the dequeue pointer */
1053 ep->bd_list.hwd_bdi = bd_xfr->next_hwd_bdi;
1054 if (req->usb_req.actual < req->usb_req.length) {
1055 dev_dbg(bdc->dev, "short xfr on %d\n", ep->ep_num);
1056 if (req->usb_req.short_not_ok)
1057 status = -EREMOTEIO;
1058 }
1059 bdc_req_complete(ep, bd_xfr->req, status);
1060 }
1061
1062 /* EP0 setup related packet handlers */
1063
1064 /*
1065 * Setup packet received, just store the packet and process on next DS or SS
1066 * started SR
1067 */
1068 void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport)
1069 {
1070 struct usb_ctrlrequest *setup_pkt;
1071 u32 len;
1072
1073 dev_dbg(bdc->dev,
1074 "%s ep0_state:%s\n",
1075 __func__, ep0_state_string[bdc->ep0_state]);
1076 /* Store received setup packet */
1077 setup_pkt = &bdc->setup_pkt;
1078 memcpy(setup_pkt, &sreport->offset[0], sizeof(*setup_pkt));
1079 len = le16_to_cpu(setup_pkt->wLength);
1080 if (!len)
1081 bdc->ep0_state = WAIT_FOR_STATUS_START;
1082 else
1083 bdc->ep0_state = WAIT_FOR_DATA_START;
1084
1085
1086 dev_dbg(bdc->dev,
1087 "%s exit ep0_state:%s\n",
1088 __func__, ep0_state_string[bdc->ep0_state]);
1089 }
1090
1091 /* Stall ep0 */
1092 static void ep0_stall(struct bdc *bdc)
1093 {
1094 struct bdc_ep *ep = bdc->bdc_ep_array[1];
1095 struct bdc_req *req;
1096
1097 dev_dbg(bdc->dev, "%s\n", __func__);
1098 bdc->delayed_status = false;
1099 ep_set_halt(ep, 1);
1100
1101 /* de-queue any pendig requests */
1102 while (!list_empty(&ep->queue)) {
1103 req = list_entry(ep->queue.next, struct bdc_req,
1104 queue);
1105 bdc_req_complete(ep, req, -ESHUTDOWN);
1106 }
1107 }
1108
1109 /* SET_ADD handlers */
1110 static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl)
1111 {
1112 enum usb_device_state state = bdc->gadget.state;
1113 int ret = 0;
1114 u32 addr;
1115
1116 addr = le16_to_cpu(ctrl->wValue);
1117 dev_dbg(bdc->dev,
1118 "%s addr:%d dev state:%d\n",
1119 __func__, addr, state);
1120
1121 if (addr > 127)
1122 return -EINVAL;
1123
1124 switch (state) {
1125 case USB_STATE_DEFAULT:
1126 case USB_STATE_ADDRESS:
1127 /* Issue Address device command */
1128 ret = bdc_address_device(bdc, addr);
1129 if (ret)
1130 return ret;
1131
1132 if (addr)
1133 usb_gadget_set_state(&bdc->gadget, USB_STATE_ADDRESS);
1134 else
1135 usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
1136
1137 bdc->dev_addr = addr;
1138 break;
1139 default:
1140 dev_warn(bdc->dev,
1141 "SET Address in wrong device state %d\n",
1142 state);
1143 ret = -EINVAL;
1144 }
1145
1146 return ret;
1147 }
1148
1149 /* Handler for SET/CLEAR FEATURE requests for device */
1150 static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue,
1151 u16 wIndex, bool set)
1152 {
1153 enum usb_device_state state = bdc->gadget.state;
1154 u32 usppms = 0;
1155
1156 dev_dbg(bdc->dev, "%s set:%d dev state:%d\n",
1157 __func__, set, state);
1158 switch (wValue) {
1159 case USB_DEVICE_REMOTE_WAKEUP:
1160 dev_dbg(bdc->dev, "USB_DEVICE_REMOTE_WAKEUP\n");
1161 if (set)
1162 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1163 else
1164 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1165 break;
1166
1167 case USB_DEVICE_TEST_MODE:
1168 dev_dbg(bdc->dev, "USB_DEVICE_TEST_MODE\n");
1169 if ((wIndex & 0xFF) ||
1170 (bdc->gadget.speed != USB_SPEED_HIGH) || !set)
1171 return -EINVAL;
1172
1173 bdc->test_mode = wIndex >> 8;
1174 break;
1175
1176 case USB_DEVICE_U1_ENABLE:
1177 dev_dbg(bdc->dev, "USB_DEVICE_U1_ENABLE\n");
1178
1179 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1180 state != USB_STATE_CONFIGURED)
1181 return -EINVAL;
1182
1183 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1184 if (set) {
1185 /* clear previous u1t */
1186 usppms &= ~BDC_U1T(BDC_U1T_MASK);
1187 usppms |= BDC_U1T(U1_TIMEOUT);
1188 usppms |= BDC_U1E | BDC_PORT_W1S;
1189 bdc->devstatus |= (1 << USB_DEV_STAT_U1_ENABLED);
1190 } else {
1191 usppms &= ~BDC_U1E;
1192 usppms |= BDC_PORT_W1S;
1193 bdc->devstatus &= ~(1 << USB_DEV_STAT_U1_ENABLED);
1194 }
1195 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1196 break;
1197
1198 case USB_DEVICE_U2_ENABLE:
1199 dev_dbg(bdc->dev, "USB_DEVICE_U2_ENABLE\n");
1200
1201 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1202 state != USB_STATE_CONFIGURED)
1203 return -EINVAL;
1204
1205 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1206 if (set) {
1207 usppms |= BDC_U2E;
1208 usppms |= BDC_U2A;
1209 bdc->devstatus |= (1 << USB_DEV_STAT_U2_ENABLED);
1210 } else {
1211 usppms &= ~BDC_U2E;
1212 usppms &= ~BDC_U2A;
1213 bdc->devstatus &= ~(1 << USB_DEV_STAT_U2_ENABLED);
1214 }
1215 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1216 break;
1217
1218 case USB_DEVICE_LTM_ENABLE:
1219 dev_dbg(bdc->dev, "USB_DEVICE_LTM_ENABLE?\n");
1220 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1221 state != USB_STATE_CONFIGURED)
1222 return -EINVAL;
1223 break;
1224 default:
1225 dev_err(bdc->dev, "Unknown wValue:%d\n", wValue);
1226 return -EOPNOTSUPP;
1227 } /* USB_RECIP_DEVICE end */
1228
1229 return 0;
1230 }
1231
1232 /* SET/CLEAR FEATURE handler */
1233 static int ep0_handle_feature(struct bdc *bdc,
1234 struct usb_ctrlrequest *setup_pkt, bool set)
1235 {
1236 enum usb_device_state state = bdc->gadget.state;
1237 struct bdc_ep *ep;
1238 u16 wValue;
1239 u16 wIndex;
1240 int epnum;
1241
1242 wValue = le16_to_cpu(setup_pkt->wValue);
1243 wIndex = le16_to_cpu(setup_pkt->wIndex);
1244
1245 dev_dbg(bdc->dev,
1246 "%s wValue=%d wIndex=%d devstate=%08x speed=%d set=%d",
1247 __func__, wValue, wIndex, state,
1248 bdc->gadget.speed, set);
1249
1250 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1251 case USB_RECIP_DEVICE:
1252 return ep0_handle_feature_dev(bdc, wValue, wIndex, set);
1253 case USB_RECIP_INTERFACE:
1254 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1255 /* USB3 spec, sec 9.4.9 */
1256 if (wValue != USB_INTRF_FUNC_SUSPEND)
1257 return -EINVAL;
1258 /* USB3 spec, Table 9-8 */
1259 if (set) {
1260 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) {
1261 dev_dbg(bdc->dev, "SET REMOTE_WAKEUP\n");
1262 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1263 } else {
1264 dev_dbg(bdc->dev, "CLEAR REMOTE_WAKEUP\n");
1265 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1266 }
1267 }
1268 break;
1269
1270 case USB_RECIP_ENDPOINT:
1271 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1272 if (wValue != USB_ENDPOINT_HALT)
1273 return -EINVAL;
1274
1275 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1276 if (epnum) {
1277 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1278 epnum = epnum * 2 + 1;
1279 else
1280 epnum *= 2;
1281 } else {
1282 epnum = 1; /*EP0*/
1283 }
1284 /*
1285 * If CLEAR_FEATURE on ep0 then don't do anything as the stall
1286 * condition on ep0 has already been cleared when SETUP packet
1287 * was received.
1288 */
1289 if (epnum == 1 && !set) {
1290 dev_dbg(bdc->dev, "ep0 stall already cleared\n");
1291 return 0;
1292 }
1293 dev_dbg(bdc->dev, "epnum=%d\n", epnum);
1294 ep = bdc->bdc_ep_array[epnum];
1295 if (!ep)
1296 return -EINVAL;
1297
1298 return ep_set_halt(ep, set);
1299 default:
1300 dev_err(bdc->dev, "Unknown recipient\n");
1301 return -EINVAL;
1302 }
1303
1304 return 0;
1305 }
1306
1307 /* GET_STATUS request handler */
1308 static int ep0_handle_status(struct bdc *bdc,
1309 struct usb_ctrlrequest *setup_pkt)
1310 {
1311 enum usb_device_state state = bdc->gadget.state;
1312 struct bdc_ep *ep;
1313 u16 usb_status = 0;
1314 u32 epnum;
1315 u16 wIndex;
1316
1317 /* USB2.0 spec sec 9.4.5 */
1318 if (state == USB_STATE_DEFAULT)
1319 return -EINVAL;
1320 wIndex = le16_to_cpu(setup_pkt->wIndex);
1321 dev_dbg(bdc->dev, "%s\n", __func__);
1322 usb_status = bdc->devstatus;
1323 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1324 case USB_RECIP_DEVICE:
1325 dev_dbg(bdc->dev,
1326 "USB_RECIP_DEVICE devstatus:%08x\n",
1327 bdc->devstatus);
1328 /* USB3 spec, sec 9.4.5 */
1329 if (bdc->gadget.speed == USB_SPEED_SUPER)
1330 usb_status &= ~REMOTE_WAKE_ENABLE;
1331 break;
1332
1333 case USB_RECIP_INTERFACE:
1334 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1335 if (bdc->gadget.speed == USB_SPEED_SUPER) {
1336 /*
1337 * This should come from func for Func remote wkup
1338 * usb_status |=1;
1339 */
1340 if (bdc->devstatus & REMOTE_WAKE_ENABLE)
1341 usb_status |= REMOTE_WAKE_ENABLE;
1342 } else {
1343 usb_status = 0;
1344 }
1345
1346 break;
1347
1348 case USB_RECIP_ENDPOINT:
1349 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1350 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1351 if (epnum) {
1352 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1353 epnum = epnum*2 + 1;
1354 else
1355 epnum *= 2;
1356 } else {
1357 epnum = 1; /* EP0 */
1358 }
1359
1360 ep = bdc->bdc_ep_array[epnum];
1361 if (!ep) {
1362 dev_err(bdc->dev, "ISSUE, GET_STATUS for invalid EP ?");
1363 return -EINVAL;
1364 }
1365 if (ep->flags & BDC_EP_STALL)
1366 usb_status |= 1 << USB_ENDPOINT_HALT;
1367
1368 break;
1369 default:
1370 dev_err(bdc->dev, "Unknown recipient for get_status\n");
1371 return -EINVAL;
1372 }
1373 /* prepare a data stage for GET_STATUS */
1374 dev_dbg(bdc->dev, "usb_status=%08x\n", usb_status);
1375 *(__le16 *)bdc->ep0_response_buff = cpu_to_le16(usb_status);
1376 bdc->ep0_req.usb_req.length = 2;
1377 bdc->ep0_req.usb_req.buf = &bdc->ep0_response_buff;
1378 ep0_queue_data_stage(bdc);
1379
1380 return 0;
1381 }
1382
1383 static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req)
1384 {
1385 /* ep0_set_sel_cmpl */
1386 }
1387
1388 /* Queue data stage to handle 6 byte SET_SEL request */
1389 static int ep0_set_sel(struct bdc *bdc,
1390 struct usb_ctrlrequest *setup_pkt)
1391 {
1392 struct bdc_ep *ep;
1393 u16 wLength;
1394
1395 dev_dbg(bdc->dev, "%s\n", __func__);
1396 wLength = le16_to_cpu(setup_pkt->wLength);
1397 if (unlikely(wLength != 6)) {
1398 dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
1399 return -EINVAL;
1400 }
1401 ep = bdc->bdc_ep_array[1];
1402 bdc->ep0_req.ep = ep;
1403 bdc->ep0_req.usb_req.length = 6;
1404 bdc->ep0_req.usb_req.buf = bdc->ep0_response_buff;
1405 bdc->ep0_req.usb_req.complete = ep0_set_sel_cmpl;
1406 ep0_queue_data_stage(bdc);
1407
1408 return 0;
1409 }
1410
1411 /*
1412 * Queue a 0 byte bd only if wLength is more than the length and and length is
1413 * a multiple of MaxPacket then queue 0 byte BD
1414 */
1415 static int ep0_queue_zlp(struct bdc *bdc)
1416 {
1417 int ret;
1418
1419 dev_dbg(bdc->dev, "%s\n", __func__);
1420 bdc->ep0_req.ep = bdc->bdc_ep_array[1];
1421 bdc->ep0_req.usb_req.length = 0;
1422 bdc->ep0_req.usb_req.complete = NULL;
1423 bdc->ep0_state = WAIT_FOR_DATA_START;
1424 ret = bdc_queue_xfr(bdc, &bdc->ep0_req);
1425 if (ret) {
1426 dev_err(bdc->dev, "err queueing zlp :%d\n", ret);
1427 return ret;
1428 }
1429 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1430
1431 return 0;
1432 }
1433
1434 /* Control request handler */
1435 static int handle_control_request(struct bdc *bdc)
1436 {
1437 enum usb_device_state state = bdc->gadget.state;
1438 struct usb_ctrlrequest *setup_pkt;
1439 int delegate_setup = 0;
1440 int ret = 0;
1441 int config = 0;
1442
1443 setup_pkt = &bdc->setup_pkt;
1444 dev_dbg(bdc->dev, "%s\n", __func__);
1445 if ((setup_pkt->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1446 switch (setup_pkt->bRequest) {
1447 case USB_REQ_SET_ADDRESS:
1448 dev_dbg(bdc->dev, "USB_REQ_SET_ADDRESS\n");
1449 ret = ep0_set_address(bdc, setup_pkt);
1450 bdc->devstatus &= DEVSTATUS_CLEAR;
1451 break;
1452
1453 case USB_REQ_SET_CONFIGURATION:
1454 dev_dbg(bdc->dev, "USB_REQ_SET_CONFIGURATION\n");
1455 if (state == USB_STATE_ADDRESS) {
1456 usb_gadget_set_state(&bdc->gadget,
1457 USB_STATE_CONFIGURED);
1458 } else if (state == USB_STATE_CONFIGURED) {
1459 /*
1460 * USB2 spec sec 9.4.7, if wValue is 0 then dev
1461 * is moved to addressed state
1462 */
1463 config = le16_to_cpu(setup_pkt->wValue);
1464 if (!config)
1465 usb_gadget_set_state(
1466 &bdc->gadget,
1467 USB_STATE_ADDRESS);
1468 }
1469 delegate_setup = 1;
1470 break;
1471
1472 case USB_REQ_SET_FEATURE:
1473 dev_dbg(bdc->dev, "USB_REQ_SET_FEATURE\n");
1474 ret = ep0_handle_feature(bdc, setup_pkt, 1);
1475 break;
1476
1477 case USB_REQ_CLEAR_FEATURE:
1478 dev_dbg(bdc->dev, "USB_REQ_CLEAR_FEATURE\n");
1479 ret = ep0_handle_feature(bdc, setup_pkt, 0);
1480 break;
1481
1482 case USB_REQ_GET_STATUS:
1483 dev_dbg(bdc->dev, "USB_REQ_GET_STATUS\n");
1484 ret = ep0_handle_status(bdc, setup_pkt);
1485 break;
1486
1487 case USB_REQ_SET_SEL:
1488 dev_dbg(bdc->dev, "USB_REQ_SET_SEL\n");
1489 ret = ep0_set_sel(bdc, setup_pkt);
1490 break;
1491
1492 case USB_REQ_SET_ISOCH_DELAY:
1493 dev_warn(bdc->dev,
1494 "USB_REQ_SET_ISOCH_DELAY not handled\n");
1495 ret = 0;
1496 break;
1497 default:
1498 delegate_setup = 1;
1499 }
1500 } else {
1501 delegate_setup = 1;
1502 }
1503
1504 if (delegate_setup) {
1505 spin_unlock(&bdc->lock);
1506 ret = bdc->gadget_driver->setup(&bdc->gadget, setup_pkt);
1507 spin_lock(&bdc->lock);
1508 }
1509
1510 return ret;
1511 }
1512
1513 /* EP0: Data stage started */
1514 void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport)
1515 {
1516 struct bdc_ep *ep;
1517 int ret = 0;
1518
1519 dev_dbg(bdc->dev, "%s\n", __func__);
1520 ep = bdc->bdc_ep_array[1];
1521 /* If ep0 was stalled, the clear it first */
1522 if (ep->flags & BDC_EP_STALL) {
1523 ret = ep_set_halt(ep, 0);
1524 if (ret)
1525 goto err;
1526 }
1527 if (bdc->ep0_state != WAIT_FOR_DATA_START)
1528 dev_warn(bdc->dev,
1529 "Data stage not expected ep0_state:%s\n",
1530 ep0_state_string[bdc->ep0_state]);
1531
1532 ret = handle_control_request(bdc);
1533 if (ret == USB_GADGET_DELAYED_STATUS) {
1534 /*
1535 * The ep0 state will remain WAIT_FOR_DATA_START till
1536 * we received ep_queue on ep0
1537 */
1538 bdc->delayed_status = true;
1539 return;
1540 }
1541 if (!ret) {
1542 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1543 dev_dbg(bdc->dev,
1544 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1545 return;
1546 }
1547 err:
1548 ep0_stall(bdc);
1549 }
1550
1551 /* EP0: status stage started */
1552 void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport)
1553 {
1554 struct usb_ctrlrequest *setup_pkt;
1555 struct bdc_ep *ep;
1556 int ret = 0;
1557
1558 dev_dbg(bdc->dev,
1559 "%s ep0_state:%s",
1560 __func__, ep0_state_string[bdc->ep0_state]);
1561 ep = bdc->bdc_ep_array[1];
1562
1563 /* check if ZLP was queued? */
1564 if (bdc->zlp_needed)
1565 bdc->zlp_needed = false;
1566
1567 if (ep->flags & BDC_EP_STALL) {
1568 ret = ep_set_halt(ep, 0);
1569 if (ret)
1570 goto err;
1571 }
1572
1573 if ((bdc->ep0_state != WAIT_FOR_STATUS_START) &&
1574 (bdc->ep0_state != WAIT_FOR_DATA_XMIT))
1575 dev_err(bdc->dev,
1576 "Status stage recv but ep0_state:%s\n",
1577 ep0_state_string[bdc->ep0_state]);
1578
1579 /* check if data stage is in progress ? */
1580 if (bdc->ep0_state == WAIT_FOR_DATA_XMIT) {
1581 bdc->ep0_state = STATUS_PENDING;
1582 /* Status stage will be queued upon Data stage transmit event */
1583 dev_dbg(bdc->dev,
1584 "status started but data not transmitted yet\n");
1585 return;
1586 }
1587 setup_pkt = &bdc->setup_pkt;
1588
1589 /*
1590 * 2 stage setup then only process the setup, for 3 stage setup the date
1591 * stage is already handled
1592 */
1593 if (!le16_to_cpu(setup_pkt->wLength)) {
1594 ret = handle_control_request(bdc);
1595 if (ret == USB_GADGET_DELAYED_STATUS) {
1596 bdc->delayed_status = true;
1597 /* ep0_state will remain WAIT_FOR_STATUS_START */
1598 return;
1599 }
1600 }
1601 if (!ret) {
1602 /* Queue a status stage BD */
1603 ep0_queue_status_stage(bdc);
1604 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
1605 dev_dbg(bdc->dev,
1606 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1607 return;
1608 }
1609 err:
1610 ep0_stall(bdc);
1611 }
1612
1613 /* Helper function to update ep0 upon SR with xsf_succ or xsf_short */
1614 static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport)
1615 {
1616 dev_dbg(bdc->dev, "%s\n", __func__);
1617 switch (bdc->ep0_state) {
1618 case WAIT_FOR_DATA_XMIT:
1619 bdc->ep0_state = WAIT_FOR_STATUS_START;
1620 break;
1621 case WAIT_FOR_STATUS_XMIT:
1622 bdc->ep0_state = WAIT_FOR_SETUP;
1623 if (bdc->test_mode) {
1624 int ret;
1625
1626 dev_dbg(bdc->dev, "test_mode:%d\n", bdc->test_mode);
1627 ret = bdc_set_test_mode(bdc);
1628 if (ret < 0) {
1629 dev_err(bdc->dev, "Err in setting Test mode\n");
1630 return;
1631 }
1632 bdc->test_mode = 0;
1633 }
1634 break;
1635 case STATUS_PENDING:
1636 bdc_xsf_ep0_status_start(bdc, sreport);
1637 break;
1638
1639 default:
1640 dev_err(bdc->dev,
1641 "Unknown ep0_state:%s\n",
1642 ep0_state_string[bdc->ep0_state]);
1643
1644 }
1645 }
1646
1647 /* xfr completion status report handler */
1648 void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport)
1649 {
1650 struct bdc_ep *ep;
1651 u32 sr_status;
1652 u8 ep_num;
1653
1654 ep_num = (le32_to_cpu(sreport->offset[3])>>4) & 0x1f;
1655 ep = bdc->bdc_ep_array[ep_num];
1656 if (!ep || !(ep->flags & BDC_EP_ENABLED)) {
1657 dev_err(bdc->dev, "xsf for ep not enabled\n");
1658 return;
1659 }
1660 /*
1661 * check if this transfer is after link went from U3->U0 due
1662 * to remote wakeup
1663 */
1664 if (bdc->devstatus & FUNC_WAKE_ISSUED) {
1665 bdc->devstatus &= ~(FUNC_WAKE_ISSUED);
1666 dev_dbg(bdc->dev, "%s clearing FUNC_WAKE_ISSUED flag\n",
1667 __func__);
1668 }
1669 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
1670 dev_dbg_ratelimited(bdc->dev, "%s sr_status=%d ep:%s\n",
1671 __func__, sr_status, ep->name);
1672
1673 switch (sr_status) {
1674 case XSF_SUCC:
1675 case XSF_SHORT:
1676 handle_xsr_succ_status(bdc, ep, sreport);
1677 if (ep_num == 1)
1678 ep0_xsf_complete(bdc, sreport);
1679 break;
1680
1681 case XSF_SETUP_RECV:
1682 case XSF_DATA_START:
1683 case XSF_STATUS_START:
1684 if (ep_num != 1) {
1685 dev_err(bdc->dev,
1686 "ep0 related packets on non ep0 endpoint");
1687 return;
1688 }
1689 bdc->sr_xsf_ep0[sr_status - XSF_SETUP_RECV](bdc, sreport);
1690 break;
1691
1692 case XSF_BABB:
1693 if (ep_num == 1) {
1694 dev_dbg(bdc->dev, "Babble on ep0 zlp_need:%d\n",
1695 bdc->zlp_needed);
1696 /*
1697 * If the last completed transfer had wLength >Data Len,
1698 * and Len is multiple of MaxPacket,then queue ZLP
1699 */
1700 if (bdc->zlp_needed) {
1701 /* queue 0 length bd */
1702 ep0_queue_zlp(bdc);
1703 return;
1704 }
1705 }
1706 dev_warn(bdc->dev, "Babble on ep not handled\n");
1707 break;
1708 default:
1709 dev_warn(bdc->dev, "sr status not handled:%x\n", sr_status);
1710 break;
1711 }
1712 }
1713
1714 static int bdc_gadget_ep_queue(struct usb_ep *_ep,
1715 struct usb_request *_req, gfp_t gfp_flags)
1716 {
1717 struct bdc_req *req;
1718 unsigned long flags;
1719 struct bdc_ep *ep;
1720 struct bdc *bdc;
1721 int ret;
1722
1723 if (!_ep || !_ep->desc)
1724 return -ESHUTDOWN;
1725
1726 if (!_req || !_req->complete || !_req->buf)
1727 return -EINVAL;
1728
1729 ep = to_bdc_ep(_ep);
1730 req = to_bdc_req(_req);
1731 bdc = ep->bdc;
1732 dev_dbg(bdc->dev, "%s ep:%p req:%p\n", __func__, ep, req);
1733 dev_dbg(bdc->dev, "queuing request %p to %s length %d zero:%d\n",
1734 _req, ep->name, _req->length, _req->zero);
1735
1736 if (!ep->usb_ep.desc) {
1737 dev_warn(bdc->dev,
1738 "trying to queue req %p to disabled %s\n",
1739 _req, ep->name);
1740 return -ESHUTDOWN;
1741 }
1742
1743 if (_req->length > MAX_XFR_LEN) {
1744 dev_warn(bdc->dev,
1745 "req length > supported MAX:%d requested:%d\n",
1746 MAX_XFR_LEN, _req->length);
1747 return -EOPNOTSUPP;
1748 }
1749 spin_lock_irqsave(&bdc->lock, flags);
1750 if (ep == bdc->bdc_ep_array[1])
1751 ret = ep0_queue(ep, req);
1752 else
1753 ret = ep_queue(ep, req);
1754
1755 spin_unlock_irqrestore(&bdc->lock, flags);
1756
1757 return ret;
1758 }
1759
1760 static int bdc_gadget_ep_dequeue(struct usb_ep *_ep,
1761 struct usb_request *_req)
1762 {
1763 struct bdc_req *req;
1764 unsigned long flags;
1765 struct bdc_ep *ep;
1766 struct bdc *bdc;
1767 int ret;
1768
1769 if (!_ep || !_req)
1770 return -EINVAL;
1771
1772 ep = to_bdc_ep(_ep);
1773 req = to_bdc_req(_req);
1774 bdc = ep->bdc;
1775 dev_dbg(bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1776 bdc_dbg_bd_list(bdc, ep);
1777 spin_lock_irqsave(&bdc->lock, flags);
1778 /* make sure it's still queued on this endpoint */
1779 list_for_each_entry(req, &ep->queue, queue) {
1780 if (&req->usb_req == _req)
1781 break;
1782 }
1783 if (&req->usb_req != _req) {
1784 spin_unlock_irqrestore(&bdc->lock, flags);
1785 dev_err(bdc->dev, "usb_req !=req n");
1786 return -EINVAL;
1787 }
1788 ret = ep_dequeue(ep, req);
1789 if (ret) {
1790 ret = -EOPNOTSUPP;
1791 goto err;
1792 }
1793 bdc_req_complete(ep, req, -ECONNRESET);
1794
1795 err:
1796 bdc_dbg_bd_list(bdc, ep);
1797 spin_unlock_irqrestore(&bdc->lock, flags);
1798
1799 return ret;
1800 }
1801
1802 static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value)
1803 {
1804 unsigned long flags;
1805 struct bdc_ep *ep;
1806 struct bdc *bdc;
1807 int ret;
1808
1809 ep = to_bdc_ep(_ep);
1810 bdc = ep->bdc;
1811 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
1812 spin_lock_irqsave(&bdc->lock, flags);
1813 if (usb_endpoint_xfer_isoc(ep->usb_ep.desc))
1814 ret = -EINVAL;
1815 else if (!list_empty(&ep->queue))
1816 ret = -EAGAIN;
1817 else
1818 ret = ep_set_halt(ep, value);
1819
1820 spin_unlock_irqrestore(&bdc->lock, flags);
1821
1822 return ret;
1823 }
1824
1825 static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep,
1826 gfp_t gfp_flags)
1827 {
1828 struct bdc_req *req;
1829 struct bdc_ep *ep;
1830
1831 req = kzalloc(sizeof(*req), gfp_flags);
1832 if (!req)
1833 return NULL;
1834
1835 ep = to_bdc_ep(_ep);
1836 req->ep = ep;
1837 req->epnum = ep->ep_num;
1838 req->usb_req.dma = DMA_ADDR_INVALID;
1839 dev_dbg(ep->bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1840
1841 return &req->usb_req;
1842 }
1843
1844 static void bdc_gadget_free_request(struct usb_ep *_ep,
1845 struct usb_request *_req)
1846 {
1847 struct bdc_req *req;
1848
1849 req = to_bdc_req(_req);
1850 kfree(req);
1851 }
1852
1853 /* endpoint operations */
1854
1855 /* configure endpoint and also allocate resources */
1856 static int bdc_gadget_ep_enable(struct usb_ep *_ep,
1857 const struct usb_endpoint_descriptor *desc)
1858 {
1859 unsigned long flags;
1860 struct bdc_ep *ep;
1861 struct bdc *bdc;
1862 int ret;
1863
1864 if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1865 pr_debug("bdc_gadget_ep_enable invalid parameters\n");
1866 return -EINVAL;
1867 }
1868
1869 if (!desc->wMaxPacketSize) {
1870 pr_debug("bdc_gadget_ep_enable missing wMaxPacketSize\n");
1871 return -EINVAL;
1872 }
1873
1874 ep = to_bdc_ep(_ep);
1875 bdc = ep->bdc;
1876
1877 /* Sanity check, upper layer will not send enable for ep0 */
1878 if (ep == bdc->bdc_ep_array[1])
1879 return -EINVAL;
1880
1881 if (!bdc->gadget_driver
1882 || bdc->gadget.speed == USB_SPEED_UNKNOWN) {
1883 return -ESHUTDOWN;
1884 }
1885
1886 dev_dbg(bdc->dev, "%s Enabling %s\n", __func__, ep->name);
1887 spin_lock_irqsave(&bdc->lock, flags);
1888 ep->desc = desc;
1889 ep->comp_desc = _ep->comp_desc;
1890 ret = bdc_ep_enable(ep);
1891 spin_unlock_irqrestore(&bdc->lock, flags);
1892
1893 return ret;
1894 }
1895
1896 static int bdc_gadget_ep_disable(struct usb_ep *_ep)
1897 {
1898 unsigned long flags;
1899 struct bdc_ep *ep;
1900 struct bdc *bdc;
1901 int ret;
1902
1903 if (!_ep) {
1904 pr_debug("bdc: invalid parameters\n");
1905 return -EINVAL;
1906 }
1907 ep = to_bdc_ep(_ep);
1908 bdc = ep->bdc;
1909
1910 /* Upper layer will not call this for ep0, but do a sanity check */
1911 if (ep == bdc->bdc_ep_array[1]) {
1912 dev_warn(bdc->dev, "%s called for ep0\n", __func__);
1913 return -EINVAL;
1914 }
1915 dev_dbg(bdc->dev,
1916 "%s() ep:%s ep->flags:%08x\n",
1917 __func__, ep->name, ep->flags);
1918
1919 if (!(ep->flags & BDC_EP_ENABLED)) {
1920 dev_warn(bdc->dev, "%s is already disabled\n", ep->name);
1921 return 0;
1922 }
1923 spin_lock_irqsave(&bdc->lock, flags);
1924 ret = bdc_ep_disable(ep);
1925 spin_unlock_irqrestore(&bdc->lock, flags);
1926
1927 return ret;
1928 }
1929
1930 static const struct usb_ep_ops bdc_gadget_ep_ops = {
1931 .enable = bdc_gadget_ep_enable,
1932 .disable = bdc_gadget_ep_disable,
1933 .alloc_request = bdc_gadget_alloc_request,
1934 .free_request = bdc_gadget_free_request,
1935 .queue = bdc_gadget_ep_queue,
1936 .dequeue = bdc_gadget_ep_dequeue,
1937 .set_halt = bdc_gadget_ep_set_halt
1938 };
1939
1940 /* dir = 1 is IN */
1941 static int init_ep(struct bdc *bdc, u32 epnum, u32 dir)
1942 {
1943 struct bdc_ep *ep;
1944
1945 dev_dbg(bdc->dev, "%s epnum=%d dir=%d\n", __func__, epnum, dir);
1946 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1947 if (!ep)
1948 return -ENOMEM;
1949
1950 ep->bdc = bdc;
1951 ep->dir = dir;
1952
1953 if (dir)
1954 ep->usb_ep.caps.dir_in = true;
1955 else
1956 ep->usb_ep.caps.dir_out = true;
1957
1958 /* ep->ep_num is the index inside bdc_ep */
1959 if (epnum == 1) {
1960 ep->ep_num = 1;
1961 bdc->bdc_ep_array[ep->ep_num] = ep;
1962 snprintf(ep->name, sizeof(ep->name), "ep%d", epnum - 1);
1963 usb_ep_set_maxpacket_limit(&ep->usb_ep, EP0_MAX_PKT_SIZE);
1964 ep->usb_ep.caps.type_control = true;
1965 ep->comp_desc = NULL;
1966 bdc->gadget.ep0 = &ep->usb_ep;
1967 } else {
1968 if (dir)
1969 ep->ep_num = epnum * 2 - 1;
1970 else
1971 ep->ep_num = epnum * 2 - 2;
1972
1973 bdc->bdc_ep_array[ep->ep_num] = ep;
1974 snprintf(ep->name, sizeof(ep->name), "ep%d%s", epnum - 1,
1975 dir & 1 ? "in" : "out");
1976
1977 usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
1978 ep->usb_ep.caps.type_iso = true;
1979 ep->usb_ep.caps.type_bulk = true;
1980 ep->usb_ep.caps.type_int = true;
1981 ep->usb_ep.max_streams = 0;
1982 list_add_tail(&ep->usb_ep.ep_list, &bdc->gadget.ep_list);
1983 }
1984 ep->usb_ep.ops = &bdc_gadget_ep_ops;
1985 ep->usb_ep.name = ep->name;
1986 ep->flags = 0;
1987 ep->ignore_next_sr = false;
1988 dev_dbg(bdc->dev, "ep=%p ep->usb_ep.name=%s epnum=%d ep->epnum=%d\n",
1989 ep, ep->usb_ep.name, epnum, ep->ep_num);
1990
1991 INIT_LIST_HEAD(&ep->queue);
1992
1993 return 0;
1994 }
1995
1996 /* Init all ep */
1997 int bdc_init_ep(struct bdc *bdc)
1998 {
1999 u8 epnum;
2000 int ret;
2001
2002 dev_dbg(bdc->dev, "%s()\n", __func__);
2003 INIT_LIST_HEAD(&bdc->gadget.ep_list);
2004 /* init ep0 */
2005 ret = init_ep(bdc, 1, 0);
2006 if (ret) {
2007 dev_err(bdc->dev, "init ep ep0 fail %d\n", ret);
2008 return ret;
2009 }
2010
2011 for (epnum = 2; epnum <= bdc->num_eps / 2; epnum++) {
2012 /* OUT */
2013 ret = init_ep(bdc, epnum, 0);
2014 if (ret) {
2015 dev_err(bdc->dev,
2016 "init ep failed for:%d error: %d\n",
2017 epnum, ret);
2018 return ret;
2019 }
2020
2021 /* IN */
2022 ret = init_ep(bdc, epnum, 1);
2023 if (ret) {
2024 dev_err(bdc->dev,
2025 "init ep failed for:%d error: %d\n",
2026 epnum, ret);
2027 return ret;
2028 }
2029 }
2030
2031 return 0;
2032 }
Linux with added FPC-III support