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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ingenic JZ4780 I2C bus driver
*
* Copyright (C) 2006 - 2009 Ingenic Semiconductor Inc.
* Copyright (C) 2015 Imagination Technologies
* Copyright (C) 2019 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/time.h>
#define JZ4780_I2C_CTRL 0x00
#define JZ4780_I2C_TAR 0x04
#define JZ4780_I2C_SAR 0x08
#define JZ4780_I2C_DC 0x10
#define JZ4780_I2C_SHCNT 0x14
#define JZ4780_I2C_SLCNT 0x18
#define JZ4780_I2C_FHCNT 0x1C
#define JZ4780_I2C_FLCNT 0x20
#define JZ4780_I2C_INTST 0x2C
#define JZ4780_I2C_INTM 0x30
#define JZ4780_I2C_RXTL 0x38
#define JZ4780_I2C_TXTL 0x3C
#define JZ4780_I2C_CINTR 0x40
#define JZ4780_I2C_CRXUF 0x44
#define JZ4780_I2C_CRXOF 0x48
#define JZ4780_I2C_CTXOF 0x4C
#define JZ4780_I2C_CRXREQ 0x50
#define JZ4780_I2C_CTXABRT 0x54
#define JZ4780_I2C_CRXDONE 0x58
#define JZ4780_I2C_CACT 0x5C
#define JZ4780_I2C_CSTP 0x60
#define JZ4780_I2C_CSTT 0x64
#define JZ4780_I2C_CGC 0x68
#define JZ4780_I2C_ENB 0x6C
#define JZ4780_I2C_STA 0x70
#define JZ4780_I2C_TXABRT 0x80
#define JZ4780_I2C_DMACR 0x88
#define JZ4780_I2C_DMATDLR 0x8C
#define JZ4780_I2C_DMARDLR 0x90
#define JZ4780_I2C_SDASU 0x94
#define JZ4780_I2C_ACKGC 0x98
#define JZ4780_I2C_ENSTA 0x9C
#define JZ4780_I2C_SDAHD 0xD0
#define X1000_I2C_SDAHD 0x7C
#define JZ4780_I2C_CTRL_STPHLD BIT(7)
#define JZ4780_I2C_CTRL_SLVDIS BIT(6)
#define JZ4780_I2C_CTRL_REST BIT(5)
#define JZ4780_I2C_CTRL_MATP BIT(4)
#define JZ4780_I2C_CTRL_SATP BIT(3)
#define JZ4780_I2C_CTRL_SPDF BIT(2)
#define JZ4780_I2C_CTRL_SPDS BIT(1)
#define JZ4780_I2C_CTRL_MD BIT(0)
#define JZ4780_I2C_STA_SLVACT BIT(6)
#define JZ4780_I2C_STA_MSTACT BIT(5)
#define JZ4780_I2C_STA_RFF BIT(4)
#define JZ4780_I2C_STA_RFNE BIT(3)
#define JZ4780_I2C_STA_TFE BIT(2)
#define JZ4780_I2C_STA_TFNF BIT(1)
#define JZ4780_I2C_STA_ACT BIT(0)
#define X1000_I2C_DC_STOP BIT(9)
static const char * const jz4780_i2c_abrt_src[] = {
"ABRT_7B_ADDR_NOACK",
"ABRT_10ADDR1_NOACK",
"ABRT_10ADDR2_NOACK",
"ABRT_XDATA_NOACK",
"ABRT_GCALL_NOACK",
"ABRT_GCALL_READ",
"ABRT_HS_ACKD",
"SBYTE_ACKDET",
"ABRT_HS_NORSTRT",
"SBYTE_NORSTRT",
"ABRT_10B_RD_NORSTRT",
"ABRT_MASTER_DIS",
"ARB_LOST",
"SLVFLUSH_TXFIFO",
"SLV_ARBLOST",
"SLVRD_INTX",
};
#define JZ4780_I2C_INTST_IGC BIT(11)
#define JZ4780_I2C_INTST_ISTT BIT(10)
#define JZ4780_I2C_INTST_ISTP BIT(9)
#define JZ4780_I2C_INTST_IACT BIT(8)
#define JZ4780_I2C_INTST_RXDN BIT(7)
#define JZ4780_I2C_INTST_TXABT BIT(6)
#define JZ4780_I2C_INTST_RDREQ BIT(5)
#define JZ4780_I2C_INTST_TXEMP BIT(4)
#define JZ4780_I2C_INTST_TXOF BIT(3)
#define JZ4780_I2C_INTST_RXFL BIT(2)
#define JZ4780_I2C_INTST_RXOF BIT(1)
#define JZ4780_I2C_INTST_RXUF BIT(0)
#define JZ4780_I2C_INTM_MIGC BIT(11)
#define JZ4780_I2C_INTM_MISTT BIT(10)
#define JZ4780_I2C_INTM_MISTP BIT(9)
#define JZ4780_I2C_INTM_MIACT BIT(8)
#define JZ4780_I2C_INTM_MRXDN BIT(7)
#define JZ4780_I2C_INTM_MTXABT BIT(6)
#define JZ4780_I2C_INTM_MRDREQ BIT(5)
#define JZ4780_I2C_INTM_MTXEMP BIT(4)
#define JZ4780_I2C_INTM_MTXOF BIT(3)
#define JZ4780_I2C_INTM_MRXFL BIT(2)
#define JZ4780_I2C_INTM_MRXOF BIT(1)
#define JZ4780_I2C_INTM_MRXUF BIT(0)
#define JZ4780_I2C_DC_READ BIT(8)
#define JZ4780_I2C_SDAHD_HDENB BIT(8)
#define JZ4780_I2C_ENB_I2C BIT(0)
#define JZ4780_I2CSHCNT_ADJUST(n) (((n) - 8) < 6 ? 6 : ((n) - 8))
#define JZ4780_I2CSLCNT_ADJUST(n) (((n) - 1) < 8 ? 8 : ((n) - 1))
#define JZ4780_I2CFHCNT_ADJUST(n) (((n) - 8) < 6 ? 6 : ((n) - 8))
#define JZ4780_I2CFLCNT_ADJUST(n) (((n) - 1) < 8 ? 8 : ((n) - 1))
#define JZ4780_I2C_FIFO_LEN 16
#define X1000_I2C_FIFO_LEN 64
#define JZ4780_I2C_TIMEOUT 300
#define BUFSIZE 200
enum ingenic_i2c_version {
ID_JZ4780,
ID_X1000,
};
/* ingenic_i2c_config: SoC specific config data. */
struct ingenic_i2c_config {
enum ingenic_i2c_version version;
int fifosize;
int tx_level;
int rx_level;
};
struct jz4780_i2c {
void __iomem *iomem;
int irq;
struct clk *clk;
struct i2c_adapter adap;
const struct ingenic_i2c_config *cdata;
/* lock to protect rbuf and wbuf between xfer_rd/wr and irq handler */
spinlock_t lock;
/* beginning of lock scope */
unsigned char *rbuf;
int rd_total_len;
int rd_data_xfered;
int rd_cmd_xfered;
unsigned char *wbuf;
int wt_len;
int is_write;
int stop_hold;
int speed;
int data_buf[BUFSIZE];
int cmd_buf[BUFSIZE];
int cmd;
/* end of lock scope */
struct completion trans_waitq;
};
static inline unsigned short jz4780_i2c_readw(struct jz4780_i2c *i2c,
unsigned long offset)
{
return readw(i2c->iomem + offset);
}
static inline void jz4780_i2c_writew(struct jz4780_i2c *i2c,
unsigned long offset, unsigned short val)
{
writew(val, i2c->iomem + offset);
}
static int jz4780_i2c_disable(struct jz4780_i2c *i2c)
{
unsigned short regval;
unsigned long loops = 5;
jz4780_i2c_writew(i2c, JZ4780_I2C_ENB, 0);
do {
regval = jz4780_i2c_readw(i2c, JZ4780_I2C_ENSTA);
if (!(regval & JZ4780_I2C_ENB_I2C))
return 0;
usleep_range(5000, 15000);
} while (--loops);
dev_err(&i2c->adap.dev, "disable failed: ENSTA=0x%04x\n", regval);
return -ETIMEDOUT;
}
static int jz4780_i2c_enable(struct jz4780_i2c *i2c)
{
unsigned short regval;
unsigned long loops = 5;
jz4780_i2c_writew(i2c, JZ4780_I2C_ENB, 1);
do {
regval = jz4780_i2c_readw(i2c, JZ4780_I2C_ENSTA);
if (regval & JZ4780_I2C_ENB_I2C)
return 0;
usleep_range(5000, 15000);
} while (--loops);
dev_err(&i2c->adap.dev, "enable failed: ENSTA=0x%04x\n", regval);
return -ETIMEDOUT;
}
static int jz4780_i2c_set_target(struct jz4780_i2c *i2c, unsigned char address)
{
unsigned short regval;
unsigned long loops = 5;
do {
regval = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
if ((regval & JZ4780_I2C_STA_TFE) &&
!(regval & JZ4780_I2C_STA_MSTACT))
break;
usleep_range(5000, 15000);
} while (--loops);
if (loops) {
jz4780_i2c_writew(i2c, JZ4780_I2C_TAR, address);
return 0;
}
dev_err(&i2c->adap.dev,
"set device to address 0x%02x failed, STA=0x%04x\n",
|