forked from RT-Thread/rt-thread
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathvbus.c
1317 lines (1087 loc) · 35.7 KB
/
vbus.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* COPYRIGHT (C) 2011-2021, Real-Thread Information Technology Ltd
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2013-11-04 Grissiom add comment
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "vbus.h"
#include "prio_queue.h"
#include "vbus_hw.h"
//#define RT_VBUS_STATISTICS
#define RT_VBUS_RB_LOW_TICK (RT_VMM_RB_BLK_NR * 2 / 3)
#define RT_VBUS_RB_TICK_STEP (100)
/* console could be run on vbus. If we log on it, there will be oops. */
#define vbus_debug(...)
#define vbus_verbose(...)
#define vbus_info(...)
#define vbus_error(...)
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(ar) (sizeof(ar)/sizeof(ar[0]))
#endif
struct rt_vbus_ring *RT_VBUS_OUT_RING;
struct rt_vbus_ring *RT_VBUS_IN_RING;
const char *rt_vbus_chn_st2str[] = {
"available",
"closed",
"establishing",
"established",
"suspended",
"closing",
};
const char *rt_vbus_sess_st2str[] = {
"available",
"listening",
"establishing",
};
const char *rt_vbus_cmd2str[] = {
"ENABLE",
"DISABLE",
"SET",
"ACK",
"NAK",
"SUSPEND",
"RESUME",
};
static char* dump_cmd_pkt(unsigned char *dp, size_t dsize);
/* 4 bytes for the head */
#define LEN2BNR(len) ((len + RT_VBUS_BLK_HEAD_SZ \
+ sizeof(struct rt_vbus_blk) - 1) \
/ sizeof(struct rt_vbus_blk))
rt_inline void _ring_add_get_bnr(struct rt_vbus_ring *ring,
rt_size_t bnr)
{
int nidx = ring->get_idx + bnr;
if (nidx >= RT_VMM_RB_BLK_NR)
{
nidx -= RT_VMM_RB_BLK_NR;
}
rt_vbus_smp_wmb();
ring->get_idx = nidx;
}
rt_inline int _bus_ring_space_nr(struct rt_vbus_ring *rg)
{
int delta;
rt_vbus_smp_rmb();
delta = rg->get_idx - rg->put_idx;
if (delta > 0)
{
/* Put is behind the get. */
return delta - 1;
}
else
{
/* delta is negative. */
return RT_VMM_RB_BLK_NR + delta - 1;
}
}
struct rt_vbus_pkg {
rt_uint8_t id;
rt_uint8_t prio;
rt_uint8_t finished;
rt_uint8_t len;
const void *data;
};
/* chn0 is always connected */
static enum rt_vbus_chn_status _chn_status[RT_VBUS_CHANNEL_NR];
rt_inline int _chn_connected(unsigned char chnr)
{
return _chn_status[chnr] == RT_VBUS_CHN_ST_ESTABLISHED ||
_chn_status[chnr] == RT_VBUS_CHN_ST_SUSPEND;
}
#ifdef RT_VBUS_USING_FLOW_CONTROL
#include <watermark_queue.h>
struct rt_watermark_queue _chn_wm_que[RT_VBUS_CHANNEL_NR];
void rt_vbus_set_post_wm(unsigned char chnr, unsigned int low, unsigned int high)
{
RT_ASSERT((0 < chnr) && (chnr < ARRAY_SIZE(_chn_wm_que)));
rt_wm_que_set_mark(&_chn_wm_que[chnr], low, high);
}
/* Threads suspended by the flow control of other side. */
rt_list_t _chn_suspended_threads[RT_VBUS_CHANNEL_NR];
struct
{
unsigned int level;
unsigned int high_mark;
unsigned int low_mark;
/* The suspend command does not have ACK. So if the other side still
* sending pkg after SUSPEND, warn it again. Also use it as a flag that
* tell me whether are we dropping from the high mark or not when reaching
* the low mark. */
unsigned int last_warn;
} _chn_recv_wm[RT_VBUS_CHANNEL_NR];
void rt_vbus_set_recv_wm(unsigned char chnr, unsigned int low, unsigned int high)
{
RT_ASSERT((0 < chnr) && (chnr < ARRAY_SIZE(_chn_recv_wm)));
_chn_recv_wm[chnr].low_mark = low;
_chn_recv_wm[chnr].high_mark = high;
}
#else
void rt_vbus_set_recv_wm(unsigned char chnr, unsigned int low, unsigned int high)
{}
void rt_vbus_set_post_wm(unsigned char chnr, unsigned int low, unsigned int high)
{}
#endif
struct {
rt_vbus_event_listener indicate;
void *ctx;
} _vbus_rx_indi[RT_VBUS_EVENT_ID_MAX][RT_VBUS_CHANNEL_NR];
void rt_vbus_register_listener(unsigned char chnr,
enum rt_vbus_event_id eve,
rt_vbus_event_listener indi,
void *ctx)
{
RT_ASSERT(chnr != 0 && chnr < RT_VBUS_CHANNEL_NR);
RT_ASSERT(eve < sizeof(_vbus_rx_indi)/sizeof(_vbus_rx_indi[0]));
_vbus_rx_indi[eve][chnr].indicate = indi;
_vbus_rx_indi[eve][chnr].ctx = ctx;
}
static void _vbus_indicate(enum rt_vbus_event_id eve, unsigned char chnr)
{
RT_ASSERT(eve < sizeof(_vbus_rx_indi)/sizeof(_vbus_rx_indi[0]));
if (_vbus_rx_indi[eve][chnr].indicate)
_vbus_rx_indi[eve][chnr].indicate(_vbus_rx_indi[eve][chnr].ctx);
}
#define _BUS_OUT_THRD_STACK_SZ 2048
#define _BUS_OUT_THRD_PRIO 8
#define _BUS_OUT_PKG_NR RT_VMM_RB_BLK_NR
static struct rt_thread _bus_out_thread;
static rt_uint8_t _bus_out_thread_stack[_BUS_OUT_THRD_STACK_SZ];
struct rt_prio_queue *_bus_out_que;
static void _bus_out_entry(void *param)
{
struct rt_vbus_pkg dpkg;
_bus_out_que = rt_prio_queue_create("vbus",
_BUS_OUT_PKG_NR,
sizeof(struct rt_vbus_pkg));
if (!_bus_out_que)
{
rt_kprintf("could not create vmm bus queue\n");
return;
}
while (rt_prio_queue_pop(_bus_out_que, &dpkg,
RT_WAITING_FOREVER) == RT_EOK)
{
int sp;
rt_uint32_t nxtidx;
const int dnr = LEN2BNR(dpkg.len);
#ifdef RT_VBUS_USING_FLOW_CONTROL
rt_wm_que_dec(&_chn_wm_que[dpkg.id]);
#endif
if (!_chn_connected(dpkg.id))
continue;
sp = _bus_ring_space_nr(RT_VBUS_OUT_RING);
vbus_debug("vmm bus out"
"(data: %p, len: %d, prio: %d, id: %d)\n",
dpkg.data, dpkg.len, dpkg.prio, dpkg.id);
/* wait for enough space */
while (sp < dnr)
{
rt_base_t level = rt_hw_interrupt_disable();
RT_VBUS_OUT_RING->blocked = 1;
rt_vbus_smp_wmb();
/* kick the guest, hoping this could force it do the work */
rt_vbus_tick(0, RT_VBUS_GUEST_VIRQ);
rt_thread_suspend(rt_thread_self());
rt_schedule();
RT_VBUS_OUT_RING->blocked = 0;
rt_hw_interrupt_enable(level);
sp = _bus_ring_space_nr(RT_VBUS_OUT_RING);
}
nxtidx = RT_VBUS_OUT_RING->put_idx + dnr;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].id = dpkg.id;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].qos = dpkg.prio;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].len = dpkg.len;
if (nxtidx >= RT_VMM_RB_BLK_NR)
{
unsigned int tailsz;
tailsz = (RT_VMM_RB_BLK_NR - RT_VBUS_OUT_RING->put_idx)
* sizeof(RT_VBUS_OUT_RING->blks[0]) - RT_VBUS_BLK_HEAD_SZ;
/* the remaining block is sufficient for the data */
if (tailsz > dpkg.len)
tailsz = dpkg.len;
rt_memcpy(&RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].data,
dpkg.data, tailsz);
rt_memcpy(&RT_VBUS_OUT_RING->blks[0],
((char*)dpkg.data)+tailsz,
dpkg.len - tailsz);
rt_vbus_smp_wmb();
RT_VBUS_OUT_RING->put_idx = nxtidx - RT_VMM_RB_BLK_NR;
}
else
{
rt_memcpy(&RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].data,
dpkg.data, dpkg.len);
rt_vbus_smp_wmb();
RT_VBUS_OUT_RING->put_idx = nxtidx;
}
rt_vbus_smp_wmb();
rt_vbus_tick(0, RT_VBUS_GUEST_VIRQ);
if (dpkg.finished)
{
_vbus_indicate(RT_VBUS_EVENT_ID_TX, dpkg.id);
}
}
RT_ASSERT(0);
}
void rt_vbus_resume_out_thread(void)
{
rt_thread_resume(&_bus_out_thread);
rt_schedule();
}
rt_err_t rt_vbus_post(rt_uint8_t id,
rt_uint8_t prio,
const void *data,
rt_size_t size,
rt_int32_t timeout)
{
rt_err_t err = RT_EOK;
struct rt_vbus_pkg pkg;
unsigned int putsz;
const unsigned char *dp;
if (!_bus_out_que)
{
rt_kprintf("post (data: %p, size: %d, timeout: %d) "
"to bus before initialition\n",
data, size, timeout);
return -RT_ERROR;
}
if (id >= RT_VBUS_CHANNEL_NR)
return -RT_ERROR;
if (timeout != 0)
{
RT_DEBUG_IN_THREAD_CONTEXT;
}
#ifdef RT_VBUS_USING_FLOW_CONTROL
while (_chn_status[id] == RT_VBUS_CHN_ST_SUSPEND)
{
rt_thread_t thread;
if (timeout == 0)
{
return -RT_EFULL;
}
thread = rt_thread_self();
thread->error = RT_EOK;
/* We only touch the _chn_suspended_threads in thread, so lock the
* scheduler is enough. */
rt_enter_critical();
rt_thread_suspend(thread);
rt_list_insert_after(&_chn_suspended_threads[id], &RT_THREAD_LIST_NODE(thread));
if (timeout > 0)
{
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_SET_TIME,
&timeout);
rt_timer_start(&(thread->thread_timer));
}
/* rt_exit_critical will do schedule on need. */
rt_exit_critical();
if (thread->error != RT_EOK)
return thread->error;
}
#endif
if (_chn_status[id] != RT_VBUS_CHN_ST_ESTABLISHED)
return -RT_ERROR;
dp = data;
pkg.id = id;
pkg.prio = prio;
for (putsz = 0; size; size -= putsz)
{
pkg.data = dp;
if (size > RT_VBUS_MAX_PKT_SZ)
{
putsz = RT_VBUS_MAX_PKT_SZ;
pkg.finished = 0;
}
else
{
putsz = size;
pkg.finished = 1;
}
pkg.len = putsz;
dp += putsz;
#ifdef RT_VBUS_USING_FLOW_CONTROL
err = rt_wm_que_inc(&_chn_wm_que[id], timeout);
if (err != RT_EOK)
break;
#endif
vbus_debug("post (data: %p(%d), size: %d, finshed: %d, timeout: %d)\n",
pkg.data, ((unsigned char*)pkg.data)[0],
pkg.len, pkg.finished, timeout);
err = rt_prio_queue_push(_bus_out_que, prio, &pkg, timeout);
if (err != RT_EOK)
break;
}
return err;
}
struct rt_completion _chn0_post_cmp;
void _chn0_tx_listener(void *p)
{
rt_completion_done(&_chn0_post_cmp);
}
/* Posts in channel0 should be sync. */
static rt_err_t _chn0_post(const void *data,
rt_size_t size,
int timeout)
{
rt_err_t err;
rt_completion_init(&_chn0_post_cmp);
err = rt_vbus_post(0, 0, data, size, timeout);
if (err != RT_EOK)
return err;
return rt_completion_wait(&_chn0_post_cmp, timeout);
}
#define _BUS_IN_THRD_STACK_SZ 1024
#define _BUS_IN_THRD_PRIO (_BUS_OUT_THRD_PRIO+1)
#if (_BUS_IN_THRD_PRIO == RT_THREAD_PRIORITY_MAX)
#error "_BUS_OUT_THRD_PRIO too low"
#endif
static struct rt_thread _bus_in_thread;
static rt_uint8_t _bus_in_thread_stack[_BUS_OUT_THRD_STACK_SZ];
static struct rt_semaphore _bus_in_sem;
static struct rt_event _bus_in_event;
/* {head, tail} */
#define _IN_ACT_HEAD 0
#define _IN_ACT_TAIL 1
static struct rt_vbus_data *_bus_in_action[RT_VBUS_CHANNEL_NR][2];
#ifdef RT_VBUS_STATISTICS
static unsigned int _bus_in_action_nr[RT_VBUS_CHANNEL_NR];
#endif
static void rt_vbus_notify_chn(unsigned char chnr, rt_err_t err)
{
#ifdef RT_VBUS_USING_FLOW_CONTROL
/* TODO: get rid of this */
/* Protect the list. */
rt_enter_critical();
while (!rt_list_isempty(&_chn_suspended_threads[chnr]))
{
rt_thread_t thread;
thread = RT_THREAD_LIST_NODE_ENTRY(_chn_suspended_threads[chnr].next);
thread->error = err;
rt_thread_resume(thread);
}
rt_exit_critical();
#endif
rt_event_send(&_bus_in_event, 1 << chnr);
}
static void rt_vbus_notify_set(rt_uint32_t set)
{
rt_event_send(&_bus_in_event, set);
}
rt_err_t rt_vbus_listen_on(rt_uint8_t chnr,
rt_int32_t timeout)
{
rt_uint32_t notuse;
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR || !_chn_connected(chnr))
return -RT_EIO;
return rt_event_recv(&_bus_in_event, 1 << chnr,
RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
timeout, ¬use);
}
void rt_vbus_data_push(unsigned int id, struct rt_vbus_data *act)
{
rt_base_t level;
RT_ASSERT(0 < id && id < RT_VBUS_CHANNEL_NR);
level = rt_hw_interrupt_disable();
if (_bus_in_action[id][_IN_ACT_HEAD] == RT_NULL)
{
_bus_in_action[id][_IN_ACT_HEAD] = act;
_bus_in_action[id][_IN_ACT_TAIL] = act;
}
else
{
_bus_in_action[id][_IN_ACT_TAIL]->next = act;
_bus_in_action[id][_IN_ACT_TAIL] = act;
}
#ifdef RT_VBUS_STATISTICS
_bus_in_action_nr[id]++;
#endif
rt_hw_interrupt_enable(level);
#ifdef RT_VBUS_USING_FLOW_CONTROL
_chn_recv_wm[id].level++;
if (_chn_recv_wm[id].level == 0)
_chn_recv_wm[id].level = ~0;
if (_chn_recv_wm[id].level > _chn_recv_wm[id].high_mark &&
_chn_recv_wm[id].level > _chn_recv_wm[id].last_warn)
{
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_SUSPEND;
buf[1] = id;
vbus_debug("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
_chn0_post(buf, sizeof(buf), RT_WAITING_FOREVER);
/* Warn the other side in 100 more pkgs. */
_chn_recv_wm[id].last_warn = _chn_recv_wm[id].level + 100;
}
#endif
}
struct rt_vbus_data* rt_vbus_data_pop(unsigned int id)
{
struct rt_vbus_data *act;
rt_base_t level;
RT_ASSERT(0 < id && id < RT_VBUS_CHANNEL_NR);
level = rt_hw_interrupt_disable();
act = _bus_in_action[id][_IN_ACT_HEAD];
if (act)
{
_bus_in_action[id][_IN_ACT_HEAD] = act->next;
}
rt_hw_interrupt_enable(level);
#ifdef RT_VBUS_USING_FLOW_CONTROL
if (_chn_recv_wm[id].level != 0)
{
_chn_recv_wm[id].level--;
if (_chn_recv_wm[id].level <= _chn_recv_wm[id].low_mark &&
_chn_recv_wm[id].last_warn > _chn_recv_wm[id].low_mark)
{
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_RESUME;
buf[1] = id;
vbus_debug("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
_chn0_post(buf, sizeof(buf), RT_WAITING_FOREVER);
_chn_recv_wm[id].last_warn = 0;
}
}
#endif
return act;
}
/* dump cmd that is not start with ACK/NAK */
static size_t __dump_naked_cmd(char *dst, size_t lsize,
unsigned char *dp, size_t dsize)
{
size_t len;
if (dp[0] == RT_VBUS_CHN0_CMD_DISABLE ||
dp[0] == RT_VBUS_CHN0_CMD_SUSPEND ||
dp[0] == RT_VBUS_CHN0_CMD_RESUME)
{
len = rt_snprintf(dst, lsize, "%s %d",
rt_vbus_cmd2str[dp[0]], dp[1]);
}
else if (dp[0] == RT_VBUS_CHN0_CMD_ENABLE)
{
len = rt_snprintf(dst, lsize, "%s %s",
rt_vbus_cmd2str[dp[0]], dp+1);
}
else if (dp[0] < RT_VBUS_CHN0_CMD_MAX)
{
len = rt_snprintf(dst, lsize, "%s %s %d",
rt_vbus_cmd2str[dp[0]],
dp+1, dp[2+rt_strlen((char*)dp+1)]);
}
else
{
len = rt_snprintf(dst, lsize, "(invalid)%d %d",
dp[0], dp[1]);
}
return len;
}
static char _cmd_dump_buf[64];
static char* dump_cmd_pkt(unsigned char *dp, size_t dsize)
{
size_t len;
if (dp[0] == RT_VBUS_CHN0_CMD_ACK || dp[0] == RT_VBUS_CHN0_CMD_NAK )
{
len = rt_snprintf(_cmd_dump_buf, sizeof(_cmd_dump_buf),
"%s ", rt_vbus_cmd2str[dp[0]]);
len += __dump_naked_cmd(_cmd_dump_buf+len, sizeof(_cmd_dump_buf)-len,
dp+1, dsize-1);
}
else
{
len = __dump_naked_cmd(_cmd_dump_buf, sizeof(_cmd_dump_buf),
dp, dsize);
}
if (len > sizeof(_cmd_dump_buf) - 1)
len = sizeof(_cmd_dump_buf) - 1;
_cmd_dump_buf[len] = '\0';
return _cmd_dump_buf;
}
static rt_err_t _chn0_echo_with(rt_uint8_t prefix,
rt_uint32_t dsize,
unsigned char *dp)
{
rt_err_t err;
unsigned char *resp;
resp = rt_malloc(dsize+1);
if (!resp)
return -RT_ENOMEM;
*resp = prefix;
rt_memcpy(resp+1, dp, dsize);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(resp, dsize+1));
err = _chn0_post(resp, dsize+1, RT_WAITING_FOREVER);
rt_free(resp);
return err;
}
static rt_err_t _chn0_nak(rt_uint32_t dsize, unsigned char *dp)
{
return _chn0_echo_with(RT_VBUS_CHN0_CMD_NAK, dsize, dp);
}
static rt_err_t _chn0_ack(rt_uint32_t dsize, unsigned char *dp)
{
return _chn0_echo_with(RT_VBUS_CHN0_CMD_ACK, dsize, dp);
}
enum _vbus_session_st
{
SESSIOM_AVAILABLE,
SESSIOM_LISTENING,
SESSIOM_ESTABLISHING,
};
struct rt_vbus_conn_session
{
/* negative value means error */
int chnr;
enum _vbus_session_st st;
struct rt_completion cmp;
struct rt_vbus_request *req;
};
static struct rt_vbus_conn_session _sess[RT_VBUS_CHANNEL_NR/2];
static int _sess_find(const unsigned char *name,
enum _vbus_session_st st)
{
int i;
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
if (_sess[i].st == st && _sess[i].req->name &&
rt_strcmp(_sess[i].req->name, (char*)name) == 0)
break;
}
return i;
}
static int _chn0_actor(unsigned char *dp, size_t dsize)
{
if (*dp != RT_VBUS_CHN0_CMD_SUSPEND && *dp != RT_VBUS_CHN0_CMD_RESUME)
vbus_verbose("local <-- %s\n", dump_cmd_pkt(dp, dsize));
switch (*dp)
{
case RT_VBUS_CHN0_CMD_ENABLE:
{
int i, chnr;
rt_err_t err;
unsigned char *resp;
i = _sess_find(dp+1, SESSIOM_LISTENING);
if (i == ARRAY_SIZE(_sess))
{
_chn0_nak(dsize, dp);
break;
}
for (chnr = 0; chnr < ARRAY_SIZE(_chn_status); chnr++)
{
if (_chn_status[chnr] == RT_VBUS_CHN_ST_AVAILABLE)
break;
}
if (chnr == ARRAY_SIZE(_chn_status))
{
_chn0_nak(dsize, dp);
break;
}
resp = rt_malloc(dsize + 1);
if (!resp)
break;
*resp = RT_VBUS_CHN0_CMD_SET;
rt_memcpy(resp+1, dp+1, dsize-1);
resp[dsize] = chnr;
rt_vbus_set_recv_wm(chnr, _sess[i].req->recv_wm.low, _sess[i].req->recv_wm.high);
rt_vbus_set_post_wm(chnr, _sess[i].req->post_wm.low, _sess[i].req->post_wm.high);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(resp, dsize+1));
err = _chn0_post(resp, dsize+1, RT_WAITING_FOREVER);
if (err == RT_EOK)
{
_sess[i].st = SESSIOM_ESTABLISHING;
vbus_debug("set sess %d st: %s\n", i,
rt_vbus_sess_st2str[_sess[i].st]);
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHING;
}
rt_free(resp);
}
break;
case RT_VBUS_CHN0_CMD_SET:
{
int i, chnr;
i = _sess_find(dp+1, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
{
vbus_verbose("drop spurious packet\n");
break;
}
chnr = dp[1+rt_strlen((const char*)dp+1)+1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
{
vbus_verbose("SET wrong chnr %d\n", chnr);
break;
}
if (_chn_status[chnr] != RT_VBUS_CHN_ST_AVAILABLE)
{
_chn0_nak(dsize, dp);
vbus_verbose("SET wrong chnr status %d, %s\n",
chnr, rt_vbus_chn_st2str[_chn_status[chnr]]);
break;
}
rt_vbus_set_recv_wm(chnr, _sess[i].req->recv_wm.low, _sess[i].req->recv_wm.high);
rt_vbus_set_post_wm(chnr, _sess[i].req->post_wm.low, _sess[i].req->post_wm.high);
if (_chn0_ack(dsize, dp) >= 0)
{
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
vbus_debug("chn %d %s\n", chnr,
rt_vbus_chn_st2str[_chn_status[chnr]]);
rt_completion_done(&_sess[i].cmp);
}
}
break;
case RT_VBUS_CHN0_CMD_ACK:
if (dp[1] == RT_VBUS_CHN0_CMD_SET)
{
int i, chnr;
i = _sess_find(dp+2, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
/* drop that spurious packet */
break;
chnr = dp[1+rt_strlen((const char*)dp+2)+2];
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
vbus_debug("chn %d %s\n", chnr,
rt_vbus_chn_st2str[_chn_status[chnr]]);
rt_completion_done(&_sess[i].cmp);
}
else if (dp[1] == RT_VBUS_CHN0_CMD_DISABLE)
{
unsigned char chnr = dp[2];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
/* We could only get here by sending DISABLE command, which is
* initiated by the rt_vbus_close_chn. */
_chn_status[chnr] = RT_VBUS_CHN_ST_AVAILABLE;
_vbus_indicate(RT_VBUS_EVENT_ID_DISCONN, chnr);
/* notify the thread that the channel has been closed */
rt_vbus_notify_chn(chnr, -RT_ERROR);
}
else
{
vbus_info("invalid ACK for %d\n", dp[1]);
}
break;
case RT_VBUS_CHN0_CMD_DISABLE:
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_CLOSING;
_chn0_ack(dsize, dp);
_vbus_indicate(RT_VBUS_EVENT_ID_DISCONN, chnr);
/* notify the thread that the channel has been closed */
rt_vbus_notify_chn(chnr, -RT_ERROR);
}
break;
case RT_VBUS_CHN0_CMD_SUSPEND:
#ifdef RT_VBUS_USING_FLOW_CONTROL
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
if (_chn_status[chnr] != RT_VBUS_CHN_ST_ESTABLISHED)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_SUSPEND;
}
#endif
break;
case RT_VBUS_CHN0_CMD_RESUME:
#ifdef RT_VBUS_USING_FLOW_CONTROL
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
if (_chn_status[chnr] != RT_VBUS_CHN_ST_SUSPEND)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
/* Protect the list. */
rt_enter_critical();
while (!rt_list_isempty(&_chn_suspended_threads[chnr]))
{
rt_thread_t thread;
thread = RT_THREAD_LIST_NODE_ENTRY(_chn_suspended_threads[chnr].next);
rt_thread_resume(thread);
}
rt_exit_critical();
}
#endif
break;
case RT_VBUS_CHN0_CMD_NAK:
if (dp[1] == RT_VBUS_CHN0_CMD_ENABLE)
{
int i;
i = _sess_find(dp+2, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
/* drop that spurious packet */
break;
_sess[i].chnr = -RT_EIO;
rt_completion_done(&_sess[i].cmp);
}
else if (dp[1] == RT_VBUS_CHN0_CMD_SET)
{
vbus_info("NAK for %d not implemented\n", dp[1]);
}
else
{
vbus_info("invalid NAK for %d\n", dp[1]);
}
break;
default:
/* just ignore the invalid cmd */
vbus_info("drop unknown cmd %d on chn0\n", *dp);
break;
};
return RT_EOK;
}
int rt_vbus_request_chn(struct rt_vbus_request *req,
int timeout)
{
int i, chnr, err;
size_t plen = rt_strlen(req->name) + 2;
unsigned char *pbuf;
rt_base_t level;
level = rt_hw_interrupt_disable();
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
if (_sess[i].st == SESSIOM_AVAILABLE)
break;
}
if (i == ARRAY_SIZE(_sess))
{
rt_hw_interrupt_enable(level);
return -RT_ERROR;
}
rt_completion_init(&_sess[i].cmp);
_sess[i].req = req;
if (req->is_server)
{
_sess[i].st = SESSIOM_LISTENING;
rt_hw_interrupt_enable(level);
vbus_debug("request listening %s on %d\n", req->name, i);
/* always wait on the condition */
err = RT_EOK;
goto _waitforcmp;
}
pbuf = rt_malloc(plen);
if (!pbuf)
{
rt_hw_interrupt_enable(level);
return -RT_ENOMEM;
}
_sess[i].st = SESSIOM_ESTABLISHING;
rt_hw_interrupt_enable(level);
pbuf[0] = RT_VBUS_CHN0_CMD_ENABLE;
rt_memcpy(pbuf+1, req->name, plen-1);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(pbuf, plen));
err = _chn0_post(pbuf, plen, RT_WAITING_FOREVER);
rt_free(pbuf);
_waitforcmp:
if (err == RT_EOK)
err = rt_completion_wait(&_sess[i].cmp, timeout);
vbus_debug("request wait cmp done %d, chnr %d\n", err, _sess[i].chnr);
if (err)
{
/* cleanup the mass when the wait is time out but we have done some job
*/
if (_sess[i].st == SESSIOM_ESTABLISHING)
_chn_status[_sess[i].chnr] = RT_VBUS_CHN_ST_AVAILABLE;
chnr = err;
goto Out;
}
RT_ASSERT(_sess[i].chnr != 0);
chnr = _sess[i].chnr;
Out:
/* detach the sess as we finished the job */
_sess[i].st = SESSIOM_AVAILABLE;
_sess[i].req = RT_NULL;
return chnr;
}
void rt_vbus_close_chn(unsigned char chnr)
{
void *p;
rt_err_t err;
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_DISABLE;
buf[1] = chnr;
RT_ASSERT(0 < chnr && chnr < RT_VBUS_CHANNEL_NR);
if (_chn_status[chnr] == RT_VBUS_CHN_ST_CLOSED ||
_chn_status[chnr] == RT_VBUS_CHN_ST_CLOSING)
{
_chn_status[chnr] = RT_VBUS_CHN_ST_AVAILABLE;
return;
}
if (!_chn_connected(chnr))
return;
_chn_status[chnr] = RT_VBUS_CHN_ST_CLOSING;
vbus_info("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
err = _chn0_post(&buf, sizeof(buf), RT_WAITING_FOREVER);
if (err == RT_EOK)
/* wait for the ack */
rt_vbus_listen_on(chnr, 10 * RT_TICK_PER_SECOND);