1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * bdc_ep.c - BRCM BDC USB3.0 device controller endpoint related functions
4 *
5 * Copyright (C) 2014 Broadcom Corporation
6 *
7 * Author: Ashwini Pahuja
8 *
9 * Based on drivers under drivers/usb/
10 */
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/kernel.h>
15 #include <linux/delay.h>
16 #include <linux/dmapool.h>
17 #include <linux/ioport.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/timer.h>
23 #include <linux/list.h>
24 #include <linux/interrupt.h>
25 #include <linux/moduleparam.h>
26 #include <linux/device.h>
27 #include <linux/usb/ch9.h>
28 #include <linux/usb/gadget.h>
29 #include <linux/usb/otg.h>
30 #include <linux/pm.h>
31 #include <linux/io.h>
32 #include <linux/irq.h>
33 #include <linux/unaligned.h>
34 #include <linux/platform_device.h>
35 #include <linux/usb/composite.h>
36
37 #include "bdc.h"
38 #include "bdc_ep.h"
39 #include "bdc_cmd.h"
40 #include "bdc_dbg.h"
41
42 static const char * const ep0_state_string[] = {
43 "WAIT_FOR_SETUP",
44 "WAIT_FOR_DATA_START",
45 "WAIT_FOR_DATA_XMIT",
46 "WAIT_FOR_STATUS_START",
47 "WAIT_FOR_STATUS_XMIT",
48 "STATUS_PENDING"
49 };
50
51 /* Free the bdl during ep disable */
ep_bd_list_free(struct bdc_ep * ep,u32 num_tabs)52 static void ep_bd_list_free(struct bdc_ep *ep, u32 num_tabs)
53 {
54 struct bd_list *bd_list = &ep->bd_list;
55 struct bdc *bdc = ep->bdc;
56 struct bd_table *bd_table;
57 int index;
58
59 dev_dbg(bdc->dev, "%s ep:%s num_tabs:%d\n",
60 __func__, ep->name, num_tabs);
61
62 if (!bd_list->bd_table_array) {
63 dev_dbg(bdc->dev, "%s already freed\n", ep->name);
64 return;
65 }
66 for (index = 0; index < num_tabs; index++) {
67 /*
68 * check if the bd_table struct is allocated ?
69 * if yes, then check if bd memory has been allocated, then
70 * free the dma_pool and also the bd_table struct memory
71 */
72 bd_table = bd_list->bd_table_array[index];
73 dev_dbg(bdc->dev, "bd_table:%p index:%d\n", bd_table, index);
74 if (!bd_table) {
75 dev_dbg(bdc->dev, "bd_table not allocated\n");
76 continue;
77 }
78 if (!bd_table->start_bd) {
79 dev_dbg(bdc->dev, "bd dma pool not allocated\n");
80 continue;
81 }
82
83 dev_dbg(bdc->dev,
84 "Free dma pool start_bd:%p dma:%llx\n",
85 bd_table->start_bd,
86 (unsigned long long)bd_table->dma);
87
88 dma_pool_free(bdc->bd_table_pool,
89 bd_table->start_bd,
90 bd_table->dma);
91 /* Free the bd_table structure */
92 kfree(bd_table);
93 }
94 /* Free the bd table array */
95 kfree(ep->bd_list.bd_table_array);
96 }
97
98 /*
99 * chain the tables, by insteting a chain bd at the end of prev_table, pointing
100 * to next_table
101 */
chain_table(struct bd_table * prev_table,struct bd_table * next_table,u32 bd_p_tab)102 static inline void chain_table(struct bd_table *prev_table,
103 struct bd_table *next_table,
104 u32 bd_p_tab)
105 {
106 /* Chain the prev table to next table */
107 prev_table->start_bd[bd_p_tab-1].offset[0] =
108 cpu_to_le32(lower_32_bits(next_table->dma));
109
110 prev_table->start_bd[bd_p_tab-1].offset[1] =
111 cpu_to_le32(upper_32_bits(next_table->dma));
112
113 prev_table->start_bd[bd_p_tab-1].offset[2] =
114 0x0;
115
116 prev_table->start_bd[bd_p_tab-1].offset[3] =
117 cpu_to_le32(MARK_CHAIN_BD);
118 }
119
120 /* Allocate the bdl for ep, during config ep */
ep_bd_list_alloc(struct bdc_ep * ep)121 static int ep_bd_list_alloc(struct bdc_ep *ep)
122 {
123 struct bd_table *prev_table = NULL;
124 int index, num_tabs, bd_p_tab;
125 struct bdc *bdc = ep->bdc;
126 struct bd_table *bd_table;
127 dma_addr_t dma;
128
129 if (usb_endpoint_xfer_isoc(ep->desc))
130 num_tabs = NUM_TABLES_ISOCH;
131 else
132 num_tabs = NUM_TABLES;
133
134 bd_p_tab = NUM_BDS_PER_TABLE;
135 /* if there is only 1 table in bd list then loop chain to self */
136 dev_dbg(bdc->dev,
137 "%s ep:%p num_tabs:%d\n",
138 __func__, ep, num_tabs);
139
140 /* Allocate memory for table array */
141 ep->bd_list.bd_table_array = kcalloc(num_tabs,
142 sizeof(struct bd_table *),
143 GFP_ATOMIC);
144 if (!ep->bd_list.bd_table_array)
145 return -ENOMEM;
146
147 /* Allocate memory for each table */
148 for (index = 0; index < num_tabs; index++) {
149 /* Allocate memory for bd_table structure */
150 bd_table = kzalloc(sizeof(*bd_table), GFP_ATOMIC);
151 if (!bd_table)
152 goto fail;
153
154 bd_table->start_bd = dma_pool_zalloc(bdc->bd_table_pool,
155 GFP_ATOMIC,
156 &dma);
157 if (!bd_table->start_bd) {
158 kfree(bd_table);
159 goto fail;
160 }
161
162 bd_table->dma = dma;
163
164 dev_dbg(bdc->dev,
165 "index:%d start_bd:%p dma=%08llx prev_table:%p\n",
166 index, bd_table->start_bd,
167 (unsigned long long)bd_table->dma, prev_table);
168
169 ep->bd_list.bd_table_array[index] = bd_table;
170 if (prev_table)
171 chain_table(prev_table, bd_table, bd_p_tab);
172
173 prev_table = bd_table;
174 }
175 chain_table(prev_table, ep->bd_list.bd_table_array[0], bd_p_tab);
176 /* Memory allocation is successful, now init the internal fields */
177 ep->bd_list.num_tabs = num_tabs;
178 ep->bd_list.max_bdi = (num_tabs * bd_p_tab) - 1;
179 ep->bd_list.num_tabs = num_tabs;
180 ep->bd_list.num_bds_table = bd_p_tab;
181 ep->bd_list.eqp_bdi = 0;
182 ep->bd_list.hwd_bdi = 0;
183
184 return 0;
185 fail:
186 /* Free the bd_table_array, bd_table struct, bd's */
187 ep_bd_list_free(ep, num_tabs);
188
189 return -ENOMEM;
190 }
191
192 /* returns how many bd's are need for this transfer */
bd_needed_req(struct bdc_req * req)193 static inline int bd_needed_req(struct bdc_req *req)
194 {
195 int bd_needed = 0;
196 int remaining;
197
198 /* 1 bd needed for 0 byte transfer */
199 if (req->usb_req.length == 0)
200 return 1;
201
202 /* remaining bytes after tranfering all max BD size BD's */
203 remaining = req->usb_req.length % BD_MAX_BUFF_SIZE;
204 if (remaining)
205 bd_needed++;
206
207 /* How many maximum BUFF size BD's ? */
208 remaining = req->usb_req.length / BD_MAX_BUFF_SIZE;
209 bd_needed += remaining;
210
211 return bd_needed;
212 }
213
214 /* returns the bd index(bdi) corresponding to bd dma address */
bd_add_to_bdi(struct bdc_ep * ep,dma_addr_t bd_dma_addr)215 static int bd_add_to_bdi(struct bdc_ep *ep, dma_addr_t bd_dma_addr)
216 {
217 struct bd_list *bd_list = &ep->bd_list;
218 dma_addr_t dma_first_bd, dma_last_bd;
219 struct bdc *bdc = ep->bdc;
220 struct bd_table *bd_table;
221 bool found = false;
222 int tbi, bdi;
223
224 dma_first_bd = dma_last_bd = 0;
225 dev_dbg(bdc->dev, "%s %llx\n",
226 __func__, (unsigned long long)bd_dma_addr);
227 /*
228 * Find in which table this bd_dma_addr belongs?, go through the table
229 * array and compare addresses of first and last address of bd of each
230 * table
231 */
232 for (tbi = 0; tbi < bd_list->num_tabs; tbi++) {
233 bd_table = bd_list->bd_table_array[tbi];
234 dma_first_bd = bd_table->dma;
235 dma_last_bd = bd_table->dma +
236 (sizeof(struct bdc_bd) *
237 (bd_list->num_bds_table - 1));
238 dev_dbg(bdc->dev, "dma_first_bd:%llx dma_last_bd:%llx\n",
239 (unsigned long long)dma_first_bd,
240 (unsigned long long)dma_last_bd);
241 if (bd_dma_addr >= dma_first_bd && bd_dma_addr <= dma_last_bd) {
242 found = true;
243 break;
244 }
245 }
246 if (unlikely(!found)) {
247 dev_err(bdc->dev, "%s FATAL err, bd not found\n", __func__);
248 return -EINVAL;
249 }
250 /* Now we know the table, find the bdi */
251 bdi = (bd_dma_addr - dma_first_bd) / sizeof(struct bdc_bd);
252
253 /* return the global bdi, to compare with ep eqp_bdi */
254 return (bdi + (tbi * bd_list->num_bds_table));
255 }
256
257 /* returns the table index(tbi) of the given bdi */
bdi_to_tbi(struct bdc_ep * ep,int bdi)258 static int bdi_to_tbi(struct bdc_ep *ep, int bdi)
259 {
260 int tbi;
261
262 tbi = bdi / ep->bd_list.num_bds_table;
263 dev_vdbg(ep->bdc->dev,
264 "bdi:%d num_bds_table:%d tbi:%d\n",
265 bdi, ep->bd_list.num_bds_table, tbi);
266
267 return tbi;
268 }
269
270 /* Find the bdi last bd in the transfer */
find_end_bdi(struct bdc_ep * ep,int next_hwd_bdi)271 static inline int find_end_bdi(struct bdc_ep *ep, int next_hwd_bdi)
272 {
273 int end_bdi;
274
275 end_bdi = next_hwd_bdi - 1;
276 if (end_bdi < 0)
277 end_bdi = ep->bd_list.max_bdi - 1;
278 else if ((end_bdi % (ep->bd_list.num_bds_table-1)) == 0)
279 end_bdi--;
280
281 return end_bdi;
282 }
283
284 /*
285 * How many transfer bd's are available on this ep bdl, chain bds are not
286 * counted in available bds
287 */
bd_available_ep(struct bdc_ep * ep)288 static int bd_available_ep(struct bdc_ep *ep)
289 {
290 struct bd_list *bd_list = &ep->bd_list;
291 int available1, available2;
292 struct bdc *bdc = ep->bdc;
293 int chain_bd1, chain_bd2;
294 int available_bd = 0;
295
296 available1 = available2 = chain_bd1 = chain_bd2 = 0;
297 /* if empty then we have all bd's available - number of chain bd's */
298 if (bd_list->eqp_bdi == bd_list->hwd_bdi)
299 return bd_list->max_bdi - bd_list->num_tabs;
300
301 /*
302 * Depending upon where eqp and dqp pointers are, caculate number
303 * of avaialble bd's
304 */
305 if (bd_list->hwd_bdi < bd_list->eqp_bdi) {
306 /* available bd's are from eqp..max_bds + 0..dqp - chain_bds */
307 available1 = bd_list->max_bdi - bd_list->eqp_bdi;
308 available2 = bd_list->hwd_bdi;
309 chain_bd1 = available1 / bd_list->num_bds_table;
310 chain_bd2 = available2 / bd_list->num_bds_table;
311 dev_vdbg(bdc->dev, "chain_bd1:%d chain_bd2:%d\n",
312 chain_bd1, chain_bd2);
313 available_bd = available1 + available2 - chain_bd1 - chain_bd2;
314 } else {
315 /* available bd's are from eqp..dqp - number of chain bd's */
316 available1 = bd_list->hwd_bdi - bd_list->eqp_bdi;
317 /* if gap between eqp and dqp is less than NUM_BDS_PER_TABLE */
318 if ((bd_list->hwd_bdi - bd_list->eqp_bdi)
319 <= bd_list->num_bds_table) {
320 /* If there any chain bd in between */
321 if (!(bdi_to_tbi(ep, bd_list->hwd_bdi)
322 == bdi_to_tbi(ep, bd_list->eqp_bdi))) {
323 available_bd = available1 - 1;
324 }
325 } else {
326 chain_bd1 = available1 / bd_list->num_bds_table;
327 available_bd = available1 - chain_bd1;
328 }
329 }
330 /*
331 * we need to keep one extra bd to check if ring is full or empty so
332 * reduce by 1
333 */
334 available_bd--;
335 dev_vdbg(bdc->dev, "available_bd:%d\n", available_bd);
336
337 return available_bd;
338 }
339
340 /* Notify the hardware after queueing the bd to bdl */
bdc_notify_xfr(struct bdc * bdc,u32 epnum)341 void bdc_notify_xfr(struct bdc *bdc, u32 epnum)
342 {
343 struct bdc_ep *ep = bdc->bdc_ep_array[epnum];
344
345 dev_vdbg(bdc->dev, "%s epnum:%d\n", __func__, epnum);
346 /*
347 * We don't have anyway to check if ep state is running,
348 * except the software flags.
349 */
350 if (unlikely(ep->flags & BDC_EP_STOP))
351 ep->flags &= ~BDC_EP_STOP;
352
353 bdc_writel(bdc->regs, BDC_XSFNTF, epnum);
354 }
355
356 /* returns the bd corresponding to bdi */
bdi_to_bd(struct bdc_ep * ep,int bdi)357 static struct bdc_bd *bdi_to_bd(struct bdc_ep *ep, int bdi)
358 {
359 int tbi = bdi_to_tbi(ep, bdi);
360 int local_bdi = 0;
361
362 local_bdi = bdi - (tbi * ep->bd_list.num_bds_table);
363 dev_vdbg(ep->bdc->dev,
364 "%s bdi:%d local_bdi:%d\n",
365 __func__, bdi, local_bdi);
366
367 return (ep->bd_list.bd_table_array[tbi]->start_bd + local_bdi);
368 }
369
370 /* Advance the enqueue pointer */
ep_bdlist_eqp_adv(struct bdc_ep * ep)371 static void ep_bdlist_eqp_adv(struct bdc_ep *ep)
372 {
373 ep->bd_list.eqp_bdi++;
374 /* if it's chain bd, then move to next */
375 if (((ep->bd_list.eqp_bdi + 1) % ep->bd_list.num_bds_table) == 0)
376 ep->bd_list.eqp_bdi++;
377
378 /* if the eqp is pointing to last + 1 then move back to 0 */
379 if (ep->bd_list.eqp_bdi == (ep->bd_list.max_bdi + 1))
380 ep->bd_list.eqp_bdi = 0;
381 }
382
383 /* Setup the first bd for ep0 transfer */
setup_first_bd_ep0(struct bdc * bdc,struct bdc_req * req,u32 * dword3)384 static int setup_first_bd_ep0(struct bdc *bdc, struct bdc_req *req, u32 *dword3)
385 {
386 u16 wValue;
387 u32 req_len;
388
389 req->ep->dir = 0;
390 req_len = req->usb_req.length;
391 switch (bdc->ep0_state) {
392 case WAIT_FOR_DATA_START:
393 *dword3 |= BD_TYPE_DS;
394 if (bdc->setup_pkt.bRequestType & USB_DIR_IN)
395 *dword3 |= BD_DIR_IN;
396
397 /* check if zlp will be needed */
398 wValue = le16_to_cpu(bdc->setup_pkt.wValue);
399 if ((wValue > req_len) &&
400 (req_len % bdc->gadget.ep0->maxpacket == 0)) {
401 dev_dbg(bdc->dev, "ZLP needed wVal:%d len:%d MaxP:%d\n",
402 wValue, req_len,
403 bdc->gadget.ep0->maxpacket);
404 bdc->zlp_needed = true;
405 }
406 break;
407
408 case WAIT_FOR_STATUS_START:
409 *dword3 |= BD_TYPE_SS;
410 if (!le16_to_cpu(bdc->setup_pkt.wLength) ||
411 !(bdc->setup_pkt.bRequestType & USB_DIR_IN))
412 *dword3 |= BD_DIR_IN;
413 break;
414 default:
415 dev_err(bdc->dev,
416 "Unknown ep0 state for queueing bd ep0_state:%s\n",
417 ep0_state_string[bdc->ep0_state]);
418 return -EINVAL;
419 }
420
421 return 0;
422 }
423
424 /* Setup the bd dma descriptor for a given request */
setup_bd_list_xfr(struct bdc * bdc,struct bdc_req * req,int num_bds)425 static int setup_bd_list_xfr(struct bdc *bdc, struct bdc_req *req, int num_bds)
426 {
427 dma_addr_t buf_add = req->usb_req.dma;
428 u32 maxp, tfs, dword2, dword3;
429 struct bd_transfer *bd_xfr;
430 struct bd_list *bd_list;
431 struct bdc_ep *ep;
432 struct bdc_bd *bd;
433 int ret, bdnum;
434 u32 req_len;
435
436 ep = req->ep;
437 bd_list = &ep->bd_list;
438 bd_xfr = &req->bd_xfr;
439 bd_xfr->req = req;
440 bd_xfr->start_bdi = bd_list->eqp_bdi;
441 bd = bdi_to_bd(ep, bd_list->eqp_bdi);
442 req_len = req->usb_req.length;
443 maxp = usb_endpoint_maxp(ep->desc);
444 tfs = roundup(req->usb_req.length, maxp);
445 tfs = tfs/maxp;
446 dev_vdbg(bdc->dev, "%s ep:%s num_bds:%d tfs:%d r_len:%d bd:%p\n",
447 __func__, ep->name, num_bds, tfs, req_len, bd);
448
449 for (bdnum = 0; bdnum < num_bds; bdnum++) {
450 dword2 = dword3 = 0;
451 /* First bd */
452 if (!bdnum) {
453 dword3 |= BD_SOT|BD_SBF|(tfs<<BD_TFS_SHIFT);
454 dword2 |= BD_LTF;
455 /* format of first bd for ep0 is different than other */
456 if (ep->ep_num == 1) {
457 ret = setup_first_bd_ep0(bdc, req, &dword3);
458 if (ret)
459 return ret;
460 }
461 }
462 if (!req->ep->dir)
463 dword3 |= BD_ISP;
464
465 if (req_len > BD_MAX_BUFF_SIZE) {
466 dword2 |= BD_MAX_BUFF_SIZE;
467 req_len -= BD_MAX_BUFF_SIZE;
468 } else {
469 /* this should be the last bd */
470 dword2 |= req_len;
471 dword3 |= BD_IOC;
472 dword3 |= BD_EOT;
473 }
474 /* Currently only 1 INT target is supported */
475 dword2 |= BD_INTR_TARGET(0);
476 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
477 if (unlikely(!bd)) {
478 dev_err(bdc->dev, "Err bd pointing to wrong addr\n");
479 return -EINVAL;
480 }
481 /* write bd */
482 bd->offset[0] = cpu_to_le32(lower_32_bits(buf_add));
483 bd->offset[1] = cpu_to_le32(upper_32_bits(buf_add));
484 bd->offset[2] = cpu_to_le32(dword2);
485 bd->offset[3] = cpu_to_le32(dword3);
486 /* advance eqp pointer */
487 ep_bdlist_eqp_adv(ep);
488 /* advance the buff pointer */
489 buf_add += BD_MAX_BUFF_SIZE;
490 dev_vdbg(bdc->dev, "buf_add:%08llx req_len:%d bd:%p eqp:%d\n",
491 (unsigned long long)buf_add, req_len, bd,
492 ep->bd_list.eqp_bdi);
493 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
494 bd->offset[3] = cpu_to_le32(BD_SBF);
495 }
496 /* clear the STOP BD fetch bit from the first bd of this xfr */
497 bd = bdi_to_bd(ep, bd_xfr->start_bdi);
498 bd->offset[3] &= cpu_to_le32(~BD_SBF);
499 /* the new eqp will be next hw dqp */
500 bd_xfr->num_bds = num_bds;
501 bd_xfr->next_hwd_bdi = ep->bd_list.eqp_bdi;
502 /* everything is written correctly before notifying the HW */
503 wmb();
504
505 return 0;
506 }
507
508 /* Queue the xfr */
bdc_queue_xfr(struct bdc * bdc,struct bdc_req * req)509 static int bdc_queue_xfr(struct bdc *bdc, struct bdc_req *req)
510 {
511 int num_bds, bd_available;
512 struct bdc_ep *ep;
513 int ret;
514
515 ep = req->ep;
516 dev_dbg(bdc->dev, "%s req:%p\n", __func__, req);
517 dev_dbg(bdc->dev, "eqp_bdi:%d hwd_bdi:%d\n",
518 ep->bd_list.eqp_bdi, ep->bd_list.hwd_bdi);
519
520 num_bds = bd_needed_req(req);
521 bd_available = bd_available_ep(ep);
522
523 /* how many bd's are avaialble on ep */
524 if (num_bds > bd_available)
525 return -ENOMEM;
526
527 ret = setup_bd_list_xfr(bdc, req, num_bds);
528 if (ret)
529 return ret;
530 list_add_tail(&req->queue, &ep->queue);
531 bdc_dbg_bd_list(bdc, ep);
532 bdc_notify_xfr(bdc, ep->ep_num);
533
534 return 0;
535 }
536
537 /* callback to gadget layer when xfr completes */
bdc_req_complete(struct bdc_ep * ep,struct bdc_req * req,int status)538 static void bdc_req_complete(struct bdc_ep *ep, struct bdc_req *req,
539 int status)
540 {
541 struct bdc *bdc = ep->bdc;
542
543 if (req == NULL)
544 return;
545
546 dev_dbg(bdc->dev, "%s ep:%s status:%d\n", __func__, ep->name, status);
547 list_del(&req->queue);
548 req->usb_req.status = status;
549 usb_gadget_unmap_request(&bdc->gadget, &req->usb_req, ep->dir);
550 if (req->usb_req.complete) {
551 spin_unlock(&bdc->lock);
552 usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
553 spin_lock(&bdc->lock);
554 }
555 }
556
557 /* Disable the endpoint */
bdc_ep_disable(struct bdc_ep * ep)558 int bdc_ep_disable(struct bdc_ep *ep)
559 {
560 struct bdc_req *req;
561 struct bdc *bdc;
562 int ret;
563
564 ret = 0;
565 bdc = ep->bdc;
566 dev_dbg(bdc->dev, "%s() ep->ep_num=%d\n", __func__, ep->ep_num);
567 /* Stop the endpoint */
568 ret = bdc_stop_ep(bdc, ep->ep_num);
569
570 /*
571 * Intentionally don't check the ret value of stop, it can fail in
572 * disconnect scenarios, continue with dconfig
573 */
574 /* de-queue any pending requests */
575 while (!list_empty(&ep->queue)) {
576 req = list_entry(ep->queue.next, struct bdc_req,
577 queue);
578 bdc_req_complete(ep, req, -ESHUTDOWN);
579 }
580 /* deconfigure the endpoint */
581 ret = bdc_dconfig_ep(bdc, ep);
582 if (ret)
583 dev_warn(bdc->dev,
584 "dconfig fail but continue with memory free");
585
586 ep->flags = 0;
587 /* ep0 memory is not freed, but reused on next connect sr */
588 if (ep->ep_num == 1)
589 return 0;
590
591 /* Free the bdl memory */
592 ep_bd_list_free(ep, ep->bd_list.num_tabs);
593 ep->desc = NULL;
594 ep->comp_desc = NULL;
595 ep->usb_ep.desc = NULL;
596 ep->ep_type = 0;
597
598 return ret;
599 }
600
601 /* Enable the ep */
bdc_ep_enable(struct bdc_ep * ep)602 int bdc_ep_enable(struct bdc_ep *ep)
603 {
604 struct bdc *bdc;
605 int ret = 0;
606
607 bdc = ep->bdc;
608 dev_dbg(bdc->dev, "%s NUM_TABLES:%d %d\n",
609 __func__, NUM_TABLES, NUM_TABLES_ISOCH);
610
611 ret = ep_bd_list_alloc(ep);
612 if (ret) {
613 dev_err(bdc->dev, "ep bd list allocation failed:%d\n", ret);
614 return -ENOMEM;
615 }
616 bdc_dbg_bd_list(bdc, ep);
617 /* only for ep0: config ep is called for ep0 from connect event */
618 if (ep->ep_num == 1)
619 return ret;
620
621 /* Issue a configure endpoint command */
622 ret = bdc_config_ep(bdc, ep);
623 if (ret)
624 return ret;
625
626 ep->usb_ep.maxpacket = usb_endpoint_maxp(ep->desc);
627 ep->usb_ep.desc = ep->desc;
628 ep->usb_ep.comp_desc = ep->comp_desc;
629 ep->ep_type = usb_endpoint_type(ep->desc);
630 ep->flags |= BDC_EP_ENABLED;
631
632 return 0;
633 }
634
635 /* EP0 related code */
636
637 /* Queue a status stage BD */
ep0_queue_status_stage(struct bdc * bdc)638 static int ep0_queue_status_stage(struct bdc *bdc)
639 {
640 struct bdc_req *status_req;
641 struct bdc_ep *ep;
642
643 status_req = &bdc->status_req;
644 ep = bdc->bdc_ep_array[1];
645 status_req->ep = ep;
646 status_req->usb_req.length = 0;
647 status_req->usb_req.status = -EINPROGRESS;
648 status_req->usb_req.actual = 0;
649 status_req->usb_req.complete = NULL;
650 bdc_queue_xfr(bdc, status_req);
651
652 return 0;
653 }
654
655 /* Queue xfr on ep0 */
ep0_queue(struct bdc_ep * ep,struct bdc_req * req)656 static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
657 {
658 struct bdc *bdc;
659 int ret;
660
661 bdc = ep->bdc;
662 dev_dbg(bdc->dev, "%s()\n", __func__);
663 req->usb_req.actual = 0;
664 req->usb_req.status = -EINPROGRESS;
665 req->epnum = ep->ep_num;
666
667 if (bdc->delayed_status) {
668 bdc->delayed_status = false;
669 /* if status stage was delayed? */
670 if (bdc->ep0_state == WAIT_FOR_STATUS_START) {
671 /* Queue a status stage BD */
672 ep0_queue_status_stage(bdc);
673 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
674 return 0;
675 }
676 } else {
677 /*
678 * if delayed status is false and 0 length transfer is requested
679 * i.e. for status stage of some setup request, then just
680 * return from here the status stage is queued independently
681 */
682 if (req->usb_req.length == 0)
683 return 0;
684
685 }
686 ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
687 if (ret) {
688 dev_err(bdc->dev, "dma mapping failed %s\n", ep->name);
689 return ret;
690 }
691
692 return bdc_queue_xfr(bdc, req);
693 }
694
695 /* Queue data stage */
ep0_queue_data_stage(struct bdc * bdc)696 static int ep0_queue_data_stage(struct bdc *bdc)
697 {
698 struct bdc_ep *ep;
699
700 dev_dbg(bdc->dev, "%s\n", __func__);
701 ep = bdc->bdc_ep_array[1];
702 bdc->ep0_req.ep = ep;
703 bdc->ep0_req.usb_req.complete = NULL;
704
705 return ep0_queue(ep, &bdc->ep0_req);
706 }
707
708 /* Queue req on ep */
ep_queue(struct bdc_ep * ep,struct bdc_req * req)709 static int ep_queue(struct bdc_ep *ep, struct bdc_req *req)
710 {
711 struct bdc *bdc;
712 int ret = 0;
713
714 if (!req || !ep->usb_ep.desc)
715 return -EINVAL;
716
717 bdc = ep->bdc;
718
719 req->usb_req.actual = 0;
720 req->usb_req.status = -EINPROGRESS;
721 req->epnum = ep->ep_num;
722
723 ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
724 if (ret) {
725 dev_err(bdc->dev, "dma mapping failed\n");
726 return ret;
727 }
728
729 return bdc_queue_xfr(bdc, req);
730 }
731
732 /* Dequeue a request from ep */
ep_dequeue(struct bdc_ep * ep,struct bdc_req * req)733 static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
734 {
735 int start_bdi, end_bdi, tbi, eqp_bdi, curr_hw_dqpi;
736 bool start_pending, end_pending;
737 bool first_remove = false;
738 struct bdc_req *first_req;
739 struct bdc_bd *bd_start;
740 struct bd_table *table;
741 dma_addr_t next_bd_dma;
742 u64 deq_ptr_64 = 0;
743 struct bdc *bdc;
744 u32 tmp_32;
745 int ret;
746
747 bdc = ep->bdc;
748 start_pending = end_pending = false;
749 eqp_bdi = ep->bd_list.eqp_bdi - 1;
750
751 if (eqp_bdi < 0)
752 eqp_bdi = ep->bd_list.max_bdi;
753
754 start_bdi = req->bd_xfr.start_bdi;
755 end_bdi = find_end_bdi(ep, req->bd_xfr.next_hwd_bdi);
756
757 dev_dbg(bdc->dev, "%s ep:%s start:%d end:%d\n",
758 __func__, ep->name, start_bdi, end_bdi);
759 dev_dbg(bdc->dev, "%s ep=%p ep->desc=%p\n", __func__,
760 ep, (void *)ep->usb_ep.desc);
761 /* if still connected, stop the ep to see where the HW is ? */
762 if (!(bdc_readl(bdc->regs, BDC_USPC) & BDC_PST_MASK)) {
763 ret = bdc_stop_ep(bdc, ep->ep_num);
764 /* if there is an issue, then no need to go further */
765 if (ret)
766 return 0;
767 } else
768 return 0;
769
770 /*
771 * After endpoint is stopped, there can be 3 cases, the request
772 * is processed, pending or in the middle of processing
773 */
774
775 /* The current hw dequeue pointer */
776 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0);
777 deq_ptr_64 = tmp_32;
778 tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1);
779 deq_ptr_64 |= ((u64)tmp_32 << 32);
780
781 /* we have the dma addr of next bd that will be fetched by hardware */
782 curr_hw_dqpi = bd_add_to_bdi(ep, deq_ptr_64);
783 if (curr_hw_dqpi < 0)
784 return curr_hw_dqpi;
785
786 /*
787 * curr_hw_dqpi points to actual dqp of HW and HW owns bd's from
788 * curr_hw_dqbdi..eqp_bdi.
789 */
790
791 /* Check if start_bdi and end_bdi are in range of HW owned BD's */
792 if (curr_hw_dqpi > eqp_bdi) {
793 /* there is a wrap from last to 0 */
794 if (start_bdi >= curr_hw_dqpi || start_bdi <= eqp_bdi) {
795 start_pending = true;
796 end_pending = true;
797 } else if (end_bdi >= curr_hw_dqpi || end_bdi <= eqp_bdi) {
798 end_pending = true;
799 }
800 } else {
801 if (start_bdi >= curr_hw_dqpi) {
802 start_pending = true;
803 end_pending = true;
804 } else if (end_bdi >= curr_hw_dqpi) {
805 end_pending = true;
806 }
807 }
808 dev_dbg(bdc->dev,
809 "start_pending:%d end_pending:%d speed:%d\n",
810 start_pending, end_pending, bdc->gadget.speed);
811
812 /* If both start till end are processes, we cannot deq req */
813 if (!start_pending && !end_pending)
814 return -EINVAL;
815
816 /*
817 * if ep_dequeue is called after disconnect then just return
818 * success from here
819 */
820 if (bdc->gadget.speed == USB_SPEED_UNKNOWN)
821 return 0;
822 tbi = bdi_to_tbi(ep, req->bd_xfr.next_hwd_bdi);
823 table = ep->bd_list.bd_table_array[tbi];
824 next_bd_dma = table->dma +
825 sizeof(struct bdc_bd)*(req->bd_xfr.next_hwd_bdi -
826 tbi * ep->bd_list.num_bds_table);
827
828 first_req = list_first_entry(&ep->queue, struct bdc_req,
829 queue);
830
831 if (req == first_req)
832 first_remove = true;
833
834 /*
835 * Due to HW limitation we need to bypadd chain bd's and issue ep_bla,
836 * incase if start is pending this is the first request in the list
837 * then issue ep_bla instead of marking as chain bd
838 */
839 if (start_pending && !first_remove) {
840 /*
841 * Mark the start bd as Chain bd, and point the chain
842 * bd to next_bd_dma
843 */
844 bd_start = bdi_to_bd(ep, start_bdi);
845 bd_start->offset[0] = cpu_to_le32(lower_32_bits(next_bd_dma));
846 bd_start->offset[1] = cpu_to_le32(upper_32_bits(next_bd_dma));
847 bd_start->offset[2] = 0x0;
848 bd_start->offset[3] = cpu_to_le32(MARK_CHAIN_BD);
849 bdc_dbg_bd_list(bdc, ep);
850 } else if (end_pending) {
851 /*
852 * The transfer is stopped in the middle, move the
853 * HW deq pointer to next_bd_dma
854 */
855 ret = bdc_ep_bla(bdc, ep, next_bd_dma);
856 if (ret) {
857 dev_err(bdc->dev, "error in ep_bla:%d\n", ret);
858 return ret;
859 }
860 }
861
862 return 0;
863 }
864
865 /* Halt/Clear the ep based on value */
ep_set_halt(struct bdc_ep * ep,u32 value)866 static int ep_set_halt(struct bdc_ep *ep, u32 value)
867 {
868 struct bdc *bdc;
869 int ret;
870
871 bdc = ep->bdc;
872 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
873
874 if (value) {
875 dev_dbg(bdc->dev, "Halt\n");
876 if (ep->ep_num == 1)
877 bdc->ep0_state = WAIT_FOR_SETUP;
878
879 ret = bdc_ep_set_stall(bdc, ep->ep_num);
880 if (ret)
881 dev_err(bdc->dev, "failed to set STALL on %s\n",
882 ep->name);
883 else
884 ep->flags |= BDC_EP_STALL;
885 } else {
886 /* Clear */
887 dev_dbg(bdc->dev, "Before Clear\n");
888 ret = bdc_ep_clear_stall(bdc, ep->ep_num);
889 if (ret)
890 dev_err(bdc->dev, "failed to clear STALL on %s\n",
891 ep->name);
892 else
893 ep->flags &= ~BDC_EP_STALL;
894 dev_dbg(bdc->dev, "After Clear\n");
895 }
896
897 return ret;
898 }
899
900 /* Free all the ep */
bdc_free_ep(struct bdc * bdc)901 void bdc_free_ep(struct bdc *bdc)
902 {
903 struct bdc_ep *ep;
904 u8 epnum;
905
906 dev_dbg(bdc->dev, "%s\n", __func__);
907 for (epnum = 1; epnum < bdc->num_eps; epnum++) {
908 ep = bdc->bdc_ep_array[epnum];
909 if (!ep)
910 continue;
911
912 if (ep->flags & BDC_EP_ENABLED)
913 ep_bd_list_free(ep, ep->bd_list.num_tabs);
914
915 /* ep0 is not in this gadget list */
916 if (epnum != 1)
917 list_del(&ep->usb_ep.ep_list);
918
919 kfree(ep);
920 }
921 }
922
923 /* USB2 spec, section 7.1.20 */
bdc_set_test_mode(struct bdc * bdc)924 static int bdc_set_test_mode(struct bdc *bdc)
925 {
926 u32 usb2_pm;
927
928 usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
929 usb2_pm &= ~BDC_PTC_MASK;
930 dev_dbg(bdc->dev, "%s\n", __func__);
931 switch (bdc->test_mode) {
932 case USB_TEST_J:
933 case USB_TEST_K:
934 case USB_TEST_SE0_NAK:
935 case USB_TEST_PACKET:
936 case USB_TEST_FORCE_ENABLE:
937 usb2_pm |= bdc->test_mode << 28;
938 break;
939 default:
940 return -EINVAL;
941 }
942 dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
943 bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
944
945 return 0;
946 }
947
948 /*
949 * Helper function to handle Transfer status report with status as either
950 * success or short
951 */
handle_xsr_succ_status(struct bdc * bdc,struct bdc_ep * ep,struct bdc_sr * sreport)952 static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep,
953 struct bdc_sr *sreport)
954 {
955 int short_bdi, start_bdi, end_bdi, max_len_bds, chain_bds;
956 struct bd_list *bd_list = &ep->bd_list;
957 int actual_length, length_short;
958 struct bd_transfer *bd_xfr;
959 struct bdc_bd *short_bd;
960 struct bdc_req *req;
961 u64 deq_ptr_64 = 0;
962 int status = 0;
963 int sr_status;
964 u32 tmp_32;
965
966 dev_dbg(bdc->dev, "%s ep:%p\n", __func__, ep);
967 bdc_dbg_srr(bdc, 0);
968 /* do not process thie sr if ignore flag is set */
969 if (ep->ignore_next_sr) {
970 ep->ignore_next_sr = false;
971 return;
972 }
973
974 if (unlikely(list_empty(&ep->queue))) {
975 dev_warn(bdc->dev, "xfr srr with no BD's queued\n");
976 return;
977 }
978 req = list_entry(ep->queue.next, struct bdc_req,
979 queue);
980
981 bd_xfr = &req->bd_xfr;
982 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
983
984 /*
985 * sr_status is short and this transfer has more than 1 bd then it needs
986 * special handling, this is only applicable for bulk and ctrl
987 */
988 if (sr_status == XSF_SHORT && bd_xfr->num_bds > 1) {
989 /*
990 * This is multi bd xfr, lets see which bd
991 * caused short transfer and how many bytes have been
992 * transferred so far.
993 */
994 tmp_32 = le32_to_cpu(sreport->offset[0]);
995 deq_ptr_64 = tmp_32;
996 tmp_32 = le32_to_cpu(sreport->offset[1]);
997 deq_ptr_64 |= ((u64)tmp_32 << 32);
998 short_bdi = bd_add_to_bdi(ep, deq_ptr_64);
999 if (unlikely(short_bdi < 0))
1000 dev_warn(bdc->dev, "bd doesn't exist?\n");
1001
1002 start_bdi = bd_xfr->start_bdi;
1003 /*
1004 * We know the start_bdi and short_bdi, how many xfr
1005 * bds in between
1006 */
1007 if (start_bdi <= short_bdi) {
1008 max_len_bds = short_bdi - start_bdi;
1009 if (max_len_bds <= bd_list->num_bds_table) {
1010 if (!(bdi_to_tbi(ep, start_bdi) ==
1011 bdi_to_tbi(ep, short_bdi)))
1012 max_len_bds--;
1013 } else {
1014 chain_bds = max_len_bds/bd_list->num_bds_table;
1015 max_len_bds -= chain_bds;
1016 }
1017 } else {
1018 /* there is a wrap in the ring within a xfr */
1019 chain_bds = (bd_list->max_bdi - start_bdi)/
1020 bd_list->num_bds_table;
1021 chain_bds += short_bdi/bd_list->num_bds_table;
1022 max_len_bds = bd_list->max_bdi - start_bdi;
1023 max_len_bds += short_bdi;
1024 max_len_bds -= chain_bds;
1025 }
1026 /* max_len_bds is the number of full length bds */
1027 end_bdi = find_end_bdi(ep, bd_xfr->next_hwd_bdi);
1028 if (!(end_bdi == short_bdi))
1029 ep->ignore_next_sr = true;
1030
1031 actual_length = max_len_bds * BD_MAX_BUFF_SIZE;
1032 short_bd = bdi_to_bd(ep, short_bdi);
1033 /* length queued */
1034 length_short = le32_to_cpu(short_bd->offset[2]) & 0x1FFFFF;
1035 /* actual length trensfered */
1036 length_short -= SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1037 actual_length += length_short;
1038 req->usb_req.actual = actual_length;
1039 } else {
1040 req->usb_req.actual = req->usb_req.length -
1041 SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1042 dev_dbg(bdc->dev,
1043 "len=%d actual=%d bd_xfr->next_hwd_bdi:%d\n",
1044 req->usb_req.length, req->usb_req.actual,
1045 bd_xfr->next_hwd_bdi);
1046 }
1047
1048 /* Update the dequeue pointer */
1049 ep->bd_list.hwd_bdi = bd_xfr->next_hwd_bdi;
1050 if (req->usb_req.actual < req->usb_req.length) {
1051 dev_dbg(bdc->dev, "short xfr on %d\n", ep->ep_num);
1052 if (req->usb_req.short_not_ok)
1053 status = -EREMOTEIO;
1054 }
1055 bdc_req_complete(ep, bd_xfr->req, status);
1056 }
1057
1058 /* EP0 setup related packet handlers */
1059
1060 /*
1061 * Setup packet received, just store the packet and process on next DS or SS
1062 * started SR
1063 */
bdc_xsf_ep0_setup_recv(struct bdc * bdc,struct bdc_sr * sreport)1064 void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport)
1065 {
1066 struct usb_ctrlrequest *setup_pkt;
1067 u32 len;
1068
1069 dev_dbg(bdc->dev,
1070 "%s ep0_state:%s\n",
1071 __func__, ep0_state_string[bdc->ep0_state]);
1072 /* Store received setup packet */
1073 setup_pkt = &bdc->setup_pkt;
1074 memcpy(setup_pkt, &sreport->offset[0], sizeof(*setup_pkt));
1075 len = le16_to_cpu(setup_pkt->wLength);
1076 if (!len)
1077 bdc->ep0_state = WAIT_FOR_STATUS_START;
1078 else
1079 bdc->ep0_state = WAIT_FOR_DATA_START;
1080
1081
1082 dev_dbg(bdc->dev,
1083 "%s exit ep0_state:%s\n",
1084 __func__, ep0_state_string[bdc->ep0_state]);
1085 }
1086
1087 /* Stall ep0 */
ep0_stall(struct bdc * bdc)1088 static void ep0_stall(struct bdc *bdc)
1089 {
1090 struct bdc_ep *ep = bdc->bdc_ep_array[1];
1091 struct bdc_req *req;
1092
1093 dev_dbg(bdc->dev, "%s\n", __func__);
1094 bdc->delayed_status = false;
1095 ep_set_halt(ep, 1);
1096
1097 /* de-queue any pendig requests */
1098 while (!list_empty(&ep->queue)) {
1099 req = list_entry(ep->queue.next, struct bdc_req,
1100 queue);
1101 bdc_req_complete(ep, req, -ESHUTDOWN);
1102 }
1103 }
1104
1105 /* SET_ADD handlers */
ep0_set_address(struct bdc * bdc,struct usb_ctrlrequest * ctrl)1106 static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl)
1107 {
1108 enum usb_device_state state = bdc->gadget.state;
1109 int ret = 0;
1110 u32 addr;
1111
1112 addr = le16_to_cpu(ctrl->wValue);
1113 dev_dbg(bdc->dev,
1114 "%s addr:%d dev state:%d\n",
1115 __func__, addr, state);
1116
1117 if (addr > 127)
1118 return -EINVAL;
1119
1120 switch (state) {
1121 case USB_STATE_DEFAULT:
1122 case USB_STATE_ADDRESS:
1123 /* Issue Address device command */
1124 ret = bdc_address_device(bdc, addr);
1125 if (ret)
1126 return ret;
1127
1128 if (addr)
1129 usb_gadget_set_state(&bdc->gadget, USB_STATE_ADDRESS);
1130 else
1131 usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
1132
1133 bdc->dev_addr = addr;
1134 break;
1135 default:
1136 dev_warn(bdc->dev,
1137 "SET Address in wrong device state %d\n",
1138 state);
1139 ret = -EINVAL;
1140 }
1141
1142 return ret;
1143 }
1144
1145 /* Handler for SET/CLEAR FEATURE requests for device */
ep0_handle_feature_dev(struct bdc * bdc,u16 wValue,u16 wIndex,bool set)1146 static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue,
1147 u16 wIndex, bool set)
1148 {
1149 enum usb_device_state state = bdc->gadget.state;
1150 u32 usppms = 0;
1151
1152 dev_dbg(bdc->dev, "%s set:%d dev state:%d\n",
1153 __func__, set, state);
1154 switch (wValue) {
1155 case USB_DEVICE_REMOTE_WAKEUP:
1156 dev_dbg(bdc->dev, "USB_DEVICE_REMOTE_WAKEUP\n");
1157 if (set)
1158 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1159 else
1160 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1161 break;
1162
1163 case USB_DEVICE_TEST_MODE:
1164 dev_dbg(bdc->dev, "USB_DEVICE_TEST_MODE\n");
1165 if ((wIndex & 0xFF) ||
1166 (bdc->gadget.speed != USB_SPEED_HIGH) || !set)
1167 return -EINVAL;
1168
1169 bdc->test_mode = wIndex >> 8;
1170 break;
1171
1172 case USB_DEVICE_U1_ENABLE:
1173 dev_dbg(bdc->dev, "USB_DEVICE_U1_ENABLE\n");
1174
1175 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1176 state != USB_STATE_CONFIGURED)
1177 return -EINVAL;
1178
1179 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1180 if (set) {
1181 /* clear previous u1t */
1182 usppms &= ~BDC_U1T(BDC_U1T_MASK);
1183 usppms |= BDC_U1T(U1_TIMEOUT);
1184 usppms |= BDC_U1E | BDC_PORT_W1S;
1185 bdc->devstatus |= (1 << USB_DEV_STAT_U1_ENABLED);
1186 } else {
1187 usppms &= ~BDC_U1E;
1188 usppms |= BDC_PORT_W1S;
1189 bdc->devstatus &= ~(1 << USB_DEV_STAT_U1_ENABLED);
1190 }
1191 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1192 break;
1193
1194 case USB_DEVICE_U2_ENABLE:
1195 dev_dbg(bdc->dev, "USB_DEVICE_U2_ENABLE\n");
1196
1197 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1198 state != USB_STATE_CONFIGURED)
1199 return -EINVAL;
1200
1201 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1202 if (set) {
1203 usppms |= BDC_U2E;
1204 usppms |= BDC_U2A;
1205 bdc->devstatus |= (1 << USB_DEV_STAT_U2_ENABLED);
1206 } else {
1207 usppms &= ~BDC_U2E;
1208 usppms &= ~BDC_U2A;
1209 bdc->devstatus &= ~(1 << USB_DEV_STAT_U2_ENABLED);
1210 }
1211 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1212 break;
1213
1214 case USB_DEVICE_LTM_ENABLE:
1215 dev_dbg(bdc->dev, "USB_DEVICE_LTM_ENABLE?\n");
1216 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1217 state != USB_STATE_CONFIGURED)
1218 return -EINVAL;
1219 break;
1220 default:
1221 dev_err(bdc->dev, "Unknown wValue:%d\n", wValue);
1222 return -EOPNOTSUPP;
1223 } /* USB_RECIP_DEVICE end */
1224
1225 return 0;
1226 }
1227
1228 /* SET/CLEAR FEATURE handler */
ep0_handle_feature(struct bdc * bdc,struct usb_ctrlrequest * setup_pkt,bool set)1229 static int ep0_handle_feature(struct bdc *bdc,
1230 struct usb_ctrlrequest *setup_pkt, bool set)
1231 {
1232 enum usb_device_state state = bdc->gadget.state;
1233 struct bdc_ep *ep;
1234 u16 wValue;
1235 u16 wIndex;
1236 int epnum;
1237
1238 wValue = le16_to_cpu(setup_pkt->wValue);
1239 wIndex = le16_to_cpu(setup_pkt->wIndex);
1240
1241 dev_dbg(bdc->dev,
1242 "%s wValue=%d wIndex=%d devstate=%08x speed=%d set=%d",
1243 __func__, wValue, wIndex, state,
1244 bdc->gadget.speed, set);
1245
1246 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1247 case USB_RECIP_DEVICE:
1248 return ep0_handle_feature_dev(bdc, wValue, wIndex, set);
1249 case USB_RECIP_INTERFACE:
1250 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1251 /* USB3 spec, sec 9.4.9 */
1252 if (wValue != USB_INTRF_FUNC_SUSPEND)
1253 return -EINVAL;
1254 /* USB3 spec, Table 9-8 */
1255 if (set) {
1256 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) {
1257 dev_dbg(bdc->dev, "SET REMOTE_WAKEUP\n");
1258 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1259 } else {
1260 dev_dbg(bdc->dev, "CLEAR REMOTE_WAKEUP\n");
1261 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1262 }
1263 }
1264 break;
1265
1266 case USB_RECIP_ENDPOINT:
1267 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1268 if (wValue != USB_ENDPOINT_HALT)
1269 return -EINVAL;
1270
1271 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1272 if (epnum) {
1273 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1274 epnum = epnum * 2 + 1;
1275 else
1276 epnum *= 2;
1277 } else {
1278 epnum = 1; /*EP0*/
1279 }
1280 /*
1281 * If CLEAR_FEATURE on ep0 then don't do anything as the stall
1282 * condition on ep0 has already been cleared when SETUP packet
1283 * was received.
1284 */
1285 if (epnum == 1 && !set) {
1286 dev_dbg(bdc->dev, "ep0 stall already cleared\n");
1287 return 0;
1288 }
1289 dev_dbg(bdc->dev, "epnum=%d\n", epnum);
1290 ep = bdc->bdc_ep_array[epnum];
1291 if (!ep)
1292 return -EINVAL;
1293
1294 return ep_set_halt(ep, set);
1295 default:
1296 dev_err(bdc->dev, "Unknown recipient\n");
1297 return -EINVAL;
1298 }
1299
1300 return 0;
1301 }
1302
1303 /* GET_STATUS request handler */
ep0_handle_status(struct bdc * bdc,struct usb_ctrlrequest * setup_pkt)1304 static int ep0_handle_status(struct bdc *bdc,
1305 struct usb_ctrlrequest *setup_pkt)
1306 {
1307 enum usb_device_state state = bdc->gadget.state;
1308 struct bdc_ep *ep;
1309 u16 usb_status = 0;
1310 u32 epnum;
1311 u16 wIndex;
1312
1313 /* USB2.0 spec sec 9.4.5 */
1314 if (state == USB_STATE_DEFAULT)
1315 return -EINVAL;
1316 wIndex = le16_to_cpu(setup_pkt->wIndex);
1317 dev_dbg(bdc->dev, "%s\n", __func__);
1318 usb_status = bdc->devstatus;
1319 switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1320 case USB_RECIP_DEVICE:
1321 dev_dbg(bdc->dev,
1322 "USB_RECIP_DEVICE devstatus:%08x\n",
1323 bdc->devstatus);
1324 /* USB3 spec, sec 9.4.5 */
1325 if (bdc->gadget.speed == USB_SPEED_SUPER)
1326 usb_status &= ~REMOTE_WAKE_ENABLE;
1327 break;
1328
1329 case USB_RECIP_INTERFACE:
1330 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1331 if (bdc->gadget.speed == USB_SPEED_SUPER) {
1332 /*
1333 * This should come from func for Func remote wkup
1334 * usb_status |=1;
1335 */
1336 if (bdc->devstatus & REMOTE_WAKE_ENABLE)
1337 usb_status |= REMOTE_WAKE_ENABLE;
1338 } else {
1339 usb_status = 0;
1340 }
1341
1342 break;
1343
1344 case USB_RECIP_ENDPOINT:
1345 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1346 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1347 if (epnum) {
1348 if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1349 epnum = epnum*2 + 1;
1350 else
1351 epnum *= 2;
1352 } else {
1353 epnum = 1; /* EP0 */
1354 }
1355
1356 ep = bdc->bdc_ep_array[epnum];
1357 if (!ep) {
1358 dev_err(bdc->dev, "ISSUE, GET_STATUS for invalid EP ?");
1359 return -EINVAL;
1360 }
1361 if (ep->flags & BDC_EP_STALL)
1362 usb_status |= 1 << USB_ENDPOINT_HALT;
1363
1364 break;
1365 default:
1366 dev_err(bdc->dev, "Unknown recipient for get_status\n");
1367 return -EINVAL;
1368 }
1369 /* prepare a data stage for GET_STATUS */
1370 dev_dbg(bdc->dev, "usb_status=%08x\n", usb_status);
1371 *(__le16 *)bdc->ep0_response_buff = cpu_to_le16(usb_status);
1372 bdc->ep0_req.usb_req.length = 2;
1373 bdc->ep0_req.usb_req.buf = &bdc->ep0_response_buff;
1374 ep0_queue_data_stage(bdc);
1375
1376 return 0;
1377 }
1378
ep0_set_sel_cmpl(struct usb_ep * _ep,struct usb_request * _req)1379 static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req)
1380 {
1381 /* ep0_set_sel_cmpl */
1382 }
1383
1384 /* Queue data stage to handle 6 byte SET_SEL request */
ep0_set_sel(struct bdc * bdc,struct usb_ctrlrequest * setup_pkt)1385 static int ep0_set_sel(struct bdc *bdc,
1386 struct usb_ctrlrequest *setup_pkt)
1387 {
1388 struct bdc_ep *ep;
1389 u16 wLength;
1390
1391 dev_dbg(bdc->dev, "%s\n", __func__);
1392 wLength = le16_to_cpu(setup_pkt->wLength);
1393 if (unlikely(wLength != 6)) {
1394 dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
1395 return -EINVAL;
1396 }
1397 ep = bdc->bdc_ep_array[1];
1398 bdc->ep0_req.ep = ep;
1399 bdc->ep0_req.usb_req.length = 6;
1400 bdc->ep0_req.usb_req.buf = bdc->ep0_response_buff;
1401 bdc->ep0_req.usb_req.complete = ep0_set_sel_cmpl;
1402 ep0_queue_data_stage(bdc);
1403
1404 return 0;
1405 }
1406
1407 /*
1408 * Queue a 0 byte bd only if wLength is more than the length and length is
1409 * a multiple of MaxPacket then queue 0 byte BD
1410 */
ep0_queue_zlp(struct bdc * bdc)1411 static int ep0_queue_zlp(struct bdc *bdc)
1412 {
1413 int ret;
1414
1415 dev_dbg(bdc->dev, "%s\n", __func__);
1416 bdc->ep0_req.ep = bdc->bdc_ep_array[1];
1417 bdc->ep0_req.usb_req.length = 0;
1418 bdc->ep0_req.usb_req.complete = NULL;
1419 bdc->ep0_state = WAIT_FOR_DATA_START;
1420 ret = bdc_queue_xfr(bdc, &bdc->ep0_req);
1421 if (ret) {
1422 dev_err(bdc->dev, "err queueing zlp :%d\n", ret);
1423 return ret;
1424 }
1425 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1426
1427 return 0;
1428 }
1429
1430 /* Control request handler */
handle_control_request(struct bdc * bdc)1431 static int handle_control_request(struct bdc *bdc)
1432 {
1433 enum usb_device_state state = bdc->gadget.state;
1434 struct usb_ctrlrequest *setup_pkt;
1435 int delegate_setup = 0;
1436 int ret = 0;
1437 int config = 0;
1438
1439 setup_pkt = &bdc->setup_pkt;
1440 dev_dbg(bdc->dev, "%s\n", __func__);
1441 if ((setup_pkt->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1442 switch (setup_pkt->bRequest) {
1443 case USB_REQ_SET_ADDRESS:
1444 dev_dbg(bdc->dev, "USB_REQ_SET_ADDRESS\n");
1445 ret = ep0_set_address(bdc, setup_pkt);
1446 bdc->devstatus &= DEVSTATUS_CLEAR;
1447 break;
1448
1449 case USB_REQ_SET_CONFIGURATION:
1450 dev_dbg(bdc->dev, "USB_REQ_SET_CONFIGURATION\n");
1451 if (state == USB_STATE_ADDRESS) {
1452 usb_gadget_set_state(&bdc->gadget,
1453 USB_STATE_CONFIGURED);
1454 } else if (state == USB_STATE_CONFIGURED) {
1455 /*
1456 * USB2 spec sec 9.4.7, if wValue is 0 then dev
1457 * is moved to addressed state
1458 */
1459 config = le16_to_cpu(setup_pkt->wValue);
1460 if (!config)
1461 usb_gadget_set_state(
1462 &bdc->gadget,
1463 USB_STATE_ADDRESS);
1464 }
1465 delegate_setup = 1;
1466 break;
1467
1468 case USB_REQ_SET_FEATURE:
1469 dev_dbg(bdc->dev, "USB_REQ_SET_FEATURE\n");
1470 ret = ep0_handle_feature(bdc, setup_pkt, 1);
1471 break;
1472
1473 case USB_REQ_CLEAR_FEATURE:
1474 dev_dbg(bdc->dev, "USB_REQ_CLEAR_FEATURE\n");
1475 ret = ep0_handle_feature(bdc, setup_pkt, 0);
1476 break;
1477
1478 case USB_REQ_GET_STATUS:
1479 dev_dbg(bdc->dev, "USB_REQ_GET_STATUS\n");
1480 ret = ep0_handle_status(bdc, setup_pkt);
1481 break;
1482
1483 case USB_REQ_SET_SEL:
1484 dev_dbg(bdc->dev, "USB_REQ_SET_SEL\n");
1485 ret = ep0_set_sel(bdc, setup_pkt);
1486 break;
1487
1488 case USB_REQ_SET_ISOCH_DELAY:
1489 dev_warn(bdc->dev,
1490 "USB_REQ_SET_ISOCH_DELAY not handled\n");
1491 ret = 0;
1492 break;
1493 default:
1494 delegate_setup = 1;
1495 }
1496 } else {
1497 delegate_setup = 1;
1498 }
1499
1500 if (delegate_setup) {
1501 spin_unlock(&bdc->lock);
1502 ret = bdc->gadget_driver->setup(&bdc->gadget, setup_pkt);
1503 spin_lock(&bdc->lock);
1504 }
1505
1506 return ret;
1507 }
1508
1509 /* EP0: Data stage started */
bdc_xsf_ep0_data_start(struct bdc * bdc,struct bdc_sr * sreport)1510 void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport)
1511 {
1512 struct bdc_ep *ep;
1513 int ret = 0;
1514
1515 dev_dbg(bdc->dev, "%s\n", __func__);
1516 ep = bdc->bdc_ep_array[1];
1517 /* If ep0 was stalled, the clear it first */
1518 if (ep->flags & BDC_EP_STALL) {
1519 ret = ep_set_halt(ep, 0);
1520 if (ret)
1521 goto err;
1522 }
1523 if (bdc->ep0_state != WAIT_FOR_DATA_START)
1524 dev_warn(bdc->dev,
1525 "Data stage not expected ep0_state:%s\n",
1526 ep0_state_string[bdc->ep0_state]);
1527
1528 ret = handle_control_request(bdc);
1529 if (ret == USB_GADGET_DELAYED_STATUS) {
1530 /*
1531 * The ep0 state will remain WAIT_FOR_DATA_START till
1532 * we received ep_queue on ep0
1533 */
1534 bdc->delayed_status = true;
1535 return;
1536 }
1537 if (!ret) {
1538 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1539 dev_dbg(bdc->dev,
1540 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1541 return;
1542 }
1543 err:
1544 ep0_stall(bdc);
1545 }
1546
1547 /* EP0: status stage started */
bdc_xsf_ep0_status_start(struct bdc * bdc,struct bdc_sr * sreport)1548 void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport)
1549 {
1550 struct usb_ctrlrequest *setup_pkt;
1551 struct bdc_ep *ep;
1552 int ret = 0;
1553
1554 dev_dbg(bdc->dev,
1555 "%s ep0_state:%s",
1556 __func__, ep0_state_string[bdc->ep0_state]);
1557 ep = bdc->bdc_ep_array[1];
1558
1559 /* check if ZLP was queued? */
1560 if (bdc->zlp_needed)
1561 bdc->zlp_needed = false;
1562
1563 if (ep->flags & BDC_EP_STALL) {
1564 ret = ep_set_halt(ep, 0);
1565 if (ret)
1566 goto err;
1567 }
1568
1569 if ((bdc->ep0_state != WAIT_FOR_STATUS_START) &&
1570 (bdc->ep0_state != WAIT_FOR_DATA_XMIT))
1571 dev_err(bdc->dev,
1572 "Status stage recv but ep0_state:%s\n",
1573 ep0_state_string[bdc->ep0_state]);
1574
1575 /* check if data stage is in progress ? */
1576 if (bdc->ep0_state == WAIT_FOR_DATA_XMIT) {
1577 bdc->ep0_state = STATUS_PENDING;
1578 /* Status stage will be queued upon Data stage transmit event */
1579 dev_dbg(bdc->dev,
1580 "status started but data not transmitted yet\n");
1581 return;
1582 }
1583 setup_pkt = &bdc->setup_pkt;
1584
1585 /*
1586 * 2 stage setup then only process the setup, for 3 stage setup the date
1587 * stage is already handled
1588 */
1589 if (!le16_to_cpu(setup_pkt->wLength)) {
1590 ret = handle_control_request(bdc);
1591 if (ret == USB_GADGET_DELAYED_STATUS) {
1592 bdc->delayed_status = true;
1593 /* ep0_state will remain WAIT_FOR_STATUS_START */
1594 return;
1595 }
1596 }
1597 if (!ret) {
1598 /* Queue a status stage BD */
1599 ep0_queue_status_stage(bdc);
1600 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
1601 dev_dbg(bdc->dev,
1602 "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1603 return;
1604 }
1605 err:
1606 ep0_stall(bdc);
1607 }
1608
1609 /* Helper function to update ep0 upon SR with xsf_succ or xsf_short */
ep0_xsf_complete(struct bdc * bdc,struct bdc_sr * sreport)1610 static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport)
1611 {
1612 dev_dbg(bdc->dev, "%s\n", __func__);
1613 switch (bdc->ep0_state) {
1614 case WAIT_FOR_DATA_XMIT:
1615 bdc->ep0_state = WAIT_FOR_STATUS_START;
1616 break;
1617 case WAIT_FOR_STATUS_XMIT:
1618 bdc->ep0_state = WAIT_FOR_SETUP;
1619 if (bdc->test_mode) {
1620 int ret;
1621
1622 dev_dbg(bdc->dev, "test_mode:%d\n", bdc->test_mode);
1623 ret = bdc_set_test_mode(bdc);
1624 if (ret < 0) {
1625 dev_err(bdc->dev, "Err in setting Test mode\n");
1626 return;
1627 }
1628 bdc->test_mode = 0;
1629 }
1630 break;
1631 case STATUS_PENDING:
1632 bdc_xsf_ep0_status_start(bdc, sreport);
1633 break;
1634
1635 default:
1636 dev_err(bdc->dev,
1637 "Unknown ep0_state:%s\n",
1638 ep0_state_string[bdc->ep0_state]);
1639
1640 }
1641 }
1642
1643 /* xfr completion status report handler */
bdc_sr_xsf(struct bdc * bdc,struct bdc_sr * sreport)1644 void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport)
1645 {
1646 struct bdc_ep *ep;
1647 u32 sr_status;
1648 u8 ep_num;
1649
1650 ep_num = (le32_to_cpu(sreport->offset[3])>>4) & 0x1f;
1651 ep = bdc->bdc_ep_array[ep_num];
1652 if (!ep || !(ep->flags & BDC_EP_ENABLED)) {
1653 dev_err(bdc->dev, "xsf for ep not enabled\n");
1654 return;
1655 }
1656 /*
1657 * check if this transfer is after link went from U3->U0 due
1658 * to remote wakeup
1659 */
1660 if (bdc->devstatus & FUNC_WAKE_ISSUED) {
1661 bdc->devstatus &= ~(FUNC_WAKE_ISSUED);
1662 dev_dbg(bdc->dev, "%s clearing FUNC_WAKE_ISSUED flag\n",
1663 __func__);
1664 }
1665 sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
1666 dev_dbg_ratelimited(bdc->dev, "%s sr_status=%d ep:%s\n",
1667 __func__, sr_status, ep->name);
1668
1669 switch (sr_status) {
1670 case XSF_SUCC:
1671 case XSF_SHORT:
1672 handle_xsr_succ_status(bdc, ep, sreport);
1673 if (ep_num == 1)
1674 ep0_xsf_complete(bdc, sreport);
1675 break;
1676
1677 case XSF_SETUP_RECV:
1678 case XSF_DATA_START:
1679 case XSF_STATUS_START:
1680 if (ep_num != 1) {
1681 dev_err(bdc->dev,
1682 "ep0 related packets on non ep0 endpoint");
1683 return;
1684 }
1685 bdc->sr_xsf_ep0[sr_status - XSF_SETUP_RECV](bdc, sreport);
1686 break;
1687
1688 case XSF_BABB:
1689 if (ep_num == 1) {
1690 dev_dbg(bdc->dev, "Babble on ep0 zlp_need:%d\n",
1691 bdc->zlp_needed);
1692 /*
1693 * If the last completed transfer had wLength >Data Len,
1694 * and Len is multiple of MaxPacket,then queue ZLP
1695 */
1696 if (bdc->zlp_needed) {
1697 /* queue 0 length bd */
1698 ep0_queue_zlp(bdc);
1699 return;
1700 }
1701 }
1702 dev_warn(bdc->dev, "Babble on ep not handled\n");
1703 break;
1704 default:
1705 dev_warn(bdc->dev, "sr status not handled:%x\n", sr_status);
1706 break;
1707 }
1708 }
1709
bdc_gadget_ep_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)1710 static int bdc_gadget_ep_queue(struct usb_ep *_ep,
1711 struct usb_request *_req, gfp_t gfp_flags)
1712 {
1713 struct bdc_req *req;
1714 unsigned long flags;
1715 struct bdc_ep *ep;
1716 struct bdc *bdc;
1717 int ret;
1718
1719 if (!_ep || !_ep->desc)
1720 return -ESHUTDOWN;
1721
1722 if (!_req || !_req->complete || !_req->buf)
1723 return -EINVAL;
1724
1725 ep = to_bdc_ep(_ep);
1726 req = to_bdc_req(_req);
1727 bdc = ep->bdc;
1728 dev_dbg(bdc->dev, "%s ep:%p req:%p\n", __func__, ep, req);
1729 dev_dbg(bdc->dev, "queuing request %p to %s length %d zero:%d\n",
1730 _req, ep->name, _req->length, _req->zero);
1731
1732 if (!ep->usb_ep.desc) {
1733 dev_warn(bdc->dev,
1734 "trying to queue req %p to disabled %s\n",
1735 _req, ep->name);
1736 return -ESHUTDOWN;
1737 }
1738
1739 if (_req->length > MAX_XFR_LEN) {
1740 dev_warn(bdc->dev,
1741 "req length > supported MAX:%d requested:%d\n",
1742 MAX_XFR_LEN, _req->length);
1743 return -EOPNOTSUPP;
1744 }
1745 spin_lock_irqsave(&bdc->lock, flags);
1746 if (ep == bdc->bdc_ep_array[1])
1747 ret = ep0_queue(ep, req);
1748 else
1749 ret = ep_queue(ep, req);
1750
1751 spin_unlock_irqrestore(&bdc->lock, flags);
1752
1753 return ret;
1754 }
1755
bdc_gadget_ep_dequeue(struct usb_ep * _ep,struct usb_request * _req)1756 static int bdc_gadget_ep_dequeue(struct usb_ep *_ep,
1757 struct usb_request *_req)
1758 {
1759 struct bdc_req *req;
1760 struct bdc_req *iter;
1761 unsigned long flags;
1762 struct bdc_ep *ep;
1763 struct bdc *bdc;
1764 int ret;
1765
1766 if (!_ep || !_req)
1767 return -EINVAL;
1768
1769 ep = to_bdc_ep(_ep);
1770 req = to_bdc_req(_req);
1771 bdc = ep->bdc;
1772 dev_dbg(bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1773 bdc_dbg_bd_list(bdc, ep);
1774 spin_lock_irqsave(&bdc->lock, flags);
1775
1776 req = NULL;
1777 /* make sure it's still queued on this endpoint */
1778 list_for_each_entry(iter, &ep->queue, queue) {
1779 if (&iter->usb_req != _req)
1780 continue;
1781 req = iter;
1782 break;
1783 }
1784 if (!req) {
1785 spin_unlock_irqrestore(&bdc->lock, flags);
1786 dev_err(bdc->dev, "usb_req !=req n");
1787 return -EINVAL;
1788 }
1789 ret = ep_dequeue(ep, req);
1790 if (ret) {
1791 ret = -EOPNOTSUPP;
1792 goto err;
1793 }
1794 bdc_req_complete(ep, req, -ECONNRESET);
1795
1796 err:
1797 bdc_dbg_bd_list(bdc, ep);
1798 spin_unlock_irqrestore(&bdc->lock, flags);
1799
1800 return ret;
1801 }
1802
bdc_gadget_ep_set_halt(struct usb_ep * _ep,int value)1803 static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value)
1804 {
1805 unsigned long flags;
1806 struct bdc_ep *ep;
1807 struct bdc *bdc;
1808 int ret;
1809
1810 ep = to_bdc_ep(_ep);
1811 bdc = ep->bdc;
1812 dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
1813 spin_lock_irqsave(&bdc->lock, flags);
1814 if (usb_endpoint_xfer_isoc(ep->usb_ep.desc))
1815 ret = -EINVAL;
1816 else if (!list_empty(&ep->queue))
1817 ret = -EAGAIN;
1818 else
1819 ret = ep_set_halt(ep, value);
1820
1821 spin_unlock_irqrestore(&bdc->lock, flags);
1822
1823 return ret;
1824 }
1825
bdc_gadget_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)1826 static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep,
1827 gfp_t gfp_flags)
1828 {
1829 struct bdc_req *req;
1830 struct bdc_ep *ep;
1831
1832 req = kzalloc(sizeof(*req), gfp_flags);
1833 if (!req)
1834 return NULL;
1835
1836 ep = to_bdc_ep(_ep);
1837 req->ep = ep;
1838 req->epnum = ep->ep_num;
1839 req->usb_req.dma = DMA_ADDR_INVALID;
1840 dev_dbg(ep->bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1841
1842 return &req->usb_req;
1843 }
1844
bdc_gadget_free_request(struct usb_ep * _ep,struct usb_request * _req)1845 static void bdc_gadget_free_request(struct usb_ep *_ep,
1846 struct usb_request *_req)
1847 {
1848 struct bdc_req *req;
1849
1850 req = to_bdc_req(_req);
1851 kfree(req);
1852 }
1853
1854 /* endpoint operations */
1855
1856 /* configure endpoint and also allocate resources */
bdc_gadget_ep_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)1857 static int bdc_gadget_ep_enable(struct usb_ep *_ep,
1858 const struct usb_endpoint_descriptor *desc)
1859 {
1860 unsigned long flags;
1861 struct bdc_ep *ep;
1862 struct bdc *bdc;
1863 int ret;
1864
1865 if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1866 pr_debug("%s invalid parameters\n", __func__);
1867 return -EINVAL;
1868 }
1869
1870 if (!desc->wMaxPacketSize) {
1871 pr_debug("%s missing wMaxPacketSize\n", __func__);
1872 return -EINVAL;
1873 }
1874
1875 ep = to_bdc_ep(_ep);
1876 bdc = ep->bdc;
1877
1878 /* Sanity check, upper layer will not send enable for ep0 */
1879 if (ep == bdc->bdc_ep_array[1])
1880 return -EINVAL;
1881
1882 if (!bdc->gadget_driver
1883 || bdc->gadget.speed == USB_SPEED_UNKNOWN) {
1884 return -ESHUTDOWN;
1885 }
1886
1887 dev_dbg(bdc->dev, "%s Enabling %s\n", __func__, ep->name);
1888 spin_lock_irqsave(&bdc->lock, flags);
1889 ep->desc = desc;
1890 ep->comp_desc = _ep->comp_desc;
1891 ret = bdc_ep_enable(ep);
1892 spin_unlock_irqrestore(&bdc->lock, flags);
1893
1894 return ret;
1895 }
1896
bdc_gadget_ep_disable(struct usb_ep * _ep)1897 static int bdc_gadget_ep_disable(struct usb_ep *_ep)
1898 {
1899 unsigned long flags;
1900 struct bdc_ep *ep;
1901 struct bdc *bdc;
1902 int ret;
1903
1904 if (!_ep) {
1905 pr_debug("bdc: invalid parameters\n");
1906 return -EINVAL;
1907 }
1908 ep = to_bdc_ep(_ep);
1909 bdc = ep->bdc;
1910
1911 /* Upper layer will not call this for ep0, but do a sanity check */
1912 if (ep == bdc->bdc_ep_array[1]) {
1913 dev_warn(bdc->dev, "%s called for ep0\n", __func__);
1914 return -EINVAL;
1915 }
1916 dev_dbg(bdc->dev,
1917 "%s() ep:%s ep->flags:%08x\n",
1918 __func__, ep->name, ep->flags);
1919
1920 if (!(ep->flags & BDC_EP_ENABLED)) {
1921 if (bdc->gadget.speed != USB_SPEED_UNKNOWN)
1922 dev_warn(bdc->dev, "%s is already disabled\n",
1923 ep->name);
1924 return 0;
1925 }
1926 spin_lock_irqsave(&bdc->lock, flags);
1927 ret = bdc_ep_disable(ep);
1928 spin_unlock_irqrestore(&bdc->lock, flags);
1929
1930 return ret;
1931 }
1932
1933 static const struct usb_ep_ops bdc_gadget_ep_ops = {
1934 .enable = bdc_gadget_ep_enable,
1935 .disable = bdc_gadget_ep_disable,
1936 .alloc_request = bdc_gadget_alloc_request,
1937 .free_request = bdc_gadget_free_request,
1938 .queue = bdc_gadget_ep_queue,
1939 .dequeue = bdc_gadget_ep_dequeue,
1940 .set_halt = bdc_gadget_ep_set_halt
1941 };
1942
1943 /* dir = 1 is IN */
init_ep(struct bdc * bdc,u32 epnum,u32 dir)1944 static int init_ep(struct bdc *bdc, u32 epnum, u32 dir)
1945 {
1946 struct bdc_ep *ep;
1947
1948 dev_dbg(bdc->dev, "%s epnum=%d dir=%d\n", __func__, epnum, dir);
1949 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1950 if (!ep)
1951 return -ENOMEM;
1952
1953 ep->bdc = bdc;
1954 ep->dir = dir;
1955
1956 if (dir)
1957 ep->usb_ep.caps.dir_in = true;
1958 else
1959 ep->usb_ep.caps.dir_out = true;
1960
1961 /* ep->ep_num is the index inside bdc_ep */
1962 if (epnum == 1) {
1963 ep->ep_num = 1;
1964 bdc->bdc_ep_array[ep->ep_num] = ep;
1965 snprintf(ep->name, sizeof(ep->name), "ep%d", epnum - 1);
1966 usb_ep_set_maxpacket_limit(&ep->usb_ep, EP0_MAX_PKT_SIZE);
1967 ep->usb_ep.caps.type_control = true;
1968 ep->comp_desc = NULL;
1969 bdc->gadget.ep0 = &ep->usb_ep;
1970 } else {
1971 if (dir)
1972 ep->ep_num = epnum * 2 - 1;
1973 else
1974 ep->ep_num = epnum * 2 - 2;
1975
1976 bdc->bdc_ep_array[ep->ep_num] = ep;
1977 snprintf(ep->name, sizeof(ep->name), "ep%d%s", epnum - 1,
1978 dir & 1 ? "in" : "out");
1979
1980 usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
1981 ep->usb_ep.caps.type_iso = true;
1982 ep->usb_ep.caps.type_bulk = true;
1983 ep->usb_ep.caps.type_int = true;
1984 ep->usb_ep.max_streams = 0;
1985 list_add_tail(&ep->usb_ep.ep_list, &bdc->gadget.ep_list);
1986 }
1987 ep->usb_ep.ops = &bdc_gadget_ep_ops;
1988 ep->usb_ep.name = ep->name;
1989 ep->flags = 0;
1990 ep->ignore_next_sr = false;
1991 dev_dbg(bdc->dev, "ep=%p ep->usb_ep.name=%s epnum=%d ep->epnum=%d\n",
1992 ep, ep->usb_ep.name, epnum, ep->ep_num);
1993
1994 INIT_LIST_HEAD(&ep->queue);
1995
1996 return 0;
1997 }
1998
1999 /* Init all ep */
bdc_init_ep(struct bdc * bdc)2000 int bdc_init_ep(struct bdc *bdc)
2001 {
2002 u8 epnum;
2003 int ret;
2004
2005 dev_dbg(bdc->dev, "%s()\n", __func__);
2006 INIT_LIST_HEAD(&bdc->gadget.ep_list);
2007 /* init ep0 */
2008 ret = init_ep(bdc, 1, 0);
2009 if (ret) {
2010 dev_err(bdc->dev, "init ep ep0 fail %d\n", ret);
2011 return ret;
2012 }
2013
2014 for (epnum = 2; epnum <= bdc->num_eps / 2; epnum++) {
2015 /* OUT */
2016 ret = init_ep(bdc, epnum, 0);
2017 if (ret) {
2018 dev_err(bdc->dev,
2019 "init ep failed for:%d error: %d\n",
2020 epnum, ret);
2021 return ret;
2022 }
2023
2024 /* IN */
2025 ret = init_ep(bdc, epnum, 1);
2026 if (ret) {
2027 dev_err(bdc->dev,
2028 "init ep failed for:%d error: %d\n",
2029 epnum, ret);
2030 return ret;
2031 }
2032 }
2033
2034 return 0;
2035 }
2036