summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/i2c-qcom-geni.c
blob: 0d2e7171e3a6f94a66d2ff85861723e0f2caea00 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.

#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma/qcom-gpi-dma.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/soc/qcom/geni-se.h>
#include <linux/spinlock.h>

#define SE_I2C_TX_TRANS_LEN		0x26c
#define SE_I2C_RX_TRANS_LEN		0x270
#define SE_I2C_SCL_COUNTERS		0x278

#define SE_I2C_ERR  (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\
			M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN)
#define SE_I2C_ABORT		BIT(1)

/* M_CMD OP codes for I2C */
#define I2C_WRITE		0x1
#define I2C_READ		0x2
#define I2C_WRITE_READ		0x3
#define I2C_ADDR_ONLY		0x4
#define I2C_BUS_CLEAR		0x6
#define I2C_STOP_ON_BUS		0x7
/* M_CMD params for I2C */
#define PRE_CMD_DELAY		BIT(0)
#define TIMESTAMP_BEFORE	BIT(1)
#define STOP_STRETCH		BIT(2)
#define TIMESTAMP_AFTER		BIT(3)
#define POST_COMMAND_DELAY	BIT(4)
#define IGNORE_ADD_NACK		BIT(6)
#define READ_FINISHED_WITH_ACK	BIT(7)
#define BYPASS_ADDR_PHASE	BIT(8)
#define SLV_ADDR_MSK		GENMASK(15, 9)
#define SLV_ADDR_SHFT		9
/* I2C SCL COUNTER fields */
#define HIGH_COUNTER_MSK	GENMASK(29, 20)
#define HIGH_COUNTER_SHFT	20
#define LOW_COUNTER_MSK		GENMASK(19, 10)
#define LOW_COUNTER_SHFT	10
#define CYCLE_COUNTER_MSK	GENMASK(9, 0)

#define I2C_PACK_TX		BIT(0)
#define I2C_PACK_RX		BIT(1)

enum geni_i2c_err_code {
	GP_IRQ0,
	NACK,
	GP_IRQ2,
	BUS_PROTO,
	ARB_LOST,
	GP_IRQ5,
	GENI_OVERRUN,
	GENI_ILLEGAL_CMD,
	GENI_ABORT_DONE,
	GENI_TIMEOUT,
};

#define DM_I2C_CB_ERR		((BIT(NACK) | BIT(BUS_PROTO) | BIT(ARB_LOST)) \
									<< 5)

#define I2C_AUTO_SUSPEND_DELAY	250
#define KHZ(freq)		(1000 * freq)
#define PACKING_BYTES_PW	4

#define ABORT_TIMEOUT		HZ
#define XFER_TIMEOUT		HZ
#define RST_TIMEOUT		HZ

struct geni_i2c_dev {
	struct geni_se se;
	u32 tx_wm;
	int irq;
	int err;
	struct i2c_adapter adap;
	struct completion done;
	struct i2c_msg *cur;
	int cur_wr;
	int cur_rd;
	spinlock_t lock;
	struct clk *core_clk;
	u32 clk_freq_out;
	const struct geni_i2c_clk_fld *clk_fld;
	int suspended;
	void *dma_buf;
	size_t xfer_len;
	dma_addr_t dma_addr;
	struct dma_chan *tx_c;
	struct dma_chan *rx_c;
	bool gpi_mode;
	bool abort_done;
};

struct geni_i2c_desc {
	bool has_core_clk;
	char *icc_ddr;
	bool no_dma_support;
	unsigned int tx_fifo_depth;
};

struct geni_i2c_err_log {
	int err;
	const char *msg;
};

static const struct geni_i2c_err_log gi2c_log[] = {
	[GP_IRQ0] = {-EIO, "Unknown I2C err GP_IRQ0"},
	[NACK] = {-ENXIO, "NACK: slv unresponsive, check its power/reset-ln"},
	[GP_IRQ2] = {-EIO, "Unknown I2C err GP IRQ2"},
	[BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unexpected start/stop"},
	[ARB_LOST] = {-EAGAIN, "Bus arbitration lost, clock line undriveable"},
	[GP_IRQ5] = {-EIO, "Unknown I2C err GP IRQ5"},
	[GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},
	[GENI_ILLEGAL_CMD] = {-EIO, "Illegal cmd, check GENI cmd-state machine"},
	[GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"},
	[GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"},
};

struct geni_i2c_clk_fld {
	u32	clk_freq_out;
	u8	clk_div;
	u8	t_high_cnt;
	u8	t_low_cnt;
	u8	t_cycle_cnt;
};

/*
 * Hardware uses the underlying formula to calculate time periods of
 * SCL clock cycle. Firmware uses some additional cycles excluded from the
 * below formula and it is confirmed that the time periods are within
 * specification limits.
 *
 * time of high period of SCL: t_high = (t_high_cnt * clk_div) / source_clock
 * time of low period of SCL: t_low = (t_low_cnt * clk_div) / source_clock
 * time of full period of SCL: t_cycle = (t_cycle_cnt * clk_div) / source_clock
 * clk_freq_out = t / t_cycle
 * source_clock = 19.2 MHz
 */
static const struct geni_i2c_clk_fld geni_i2c_clk_map[] = {
	{KHZ(100), 7, 10, 11, 26},
	{KHZ(400), 2,  5, 12, 24},
	{KHZ(1000), 1, 3,  9, 18},
};

static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
{
	int i;
	const struct geni_i2c_clk_fld *itr = geni_i2c_clk_map;

	for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) {
		if (itr->clk_freq_out == gi2c->clk_freq_out) {
			gi2c->clk_fld = itr;
			return 0;
		}
	}
	return -EINVAL;
}

static void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c)
{
	const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
	u32 val;

	writel_relaxed(0, gi2c->se.base + SE_GENI_CLK_SEL);

	val = (itr->clk_div << CLK_DIV_SHFT) | SER_CLK_EN;
	writel_relaxed(val, gi2c->se.base + GENI_SER_M_CLK_CFG);

	val = itr->t_high_cnt << HIGH_COUNTER_SHFT;
	val |= itr->t_low_cnt << LOW_COUNTER_SHFT;
	val |= itr->t_cycle_cnt;
	writel_relaxed(val, gi2c->se.base + SE_I2C_SCL_COUNTERS);
}

static void geni_i2c_err_misc(struct geni_i2c_dev *gi2c)
{
	u32 m_cmd = readl_relaxed(gi2c->se.base + SE_GENI_M_CMD0);
	u32 m_stat = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS);
	u32 geni_s = readl_relaxed(gi2c->se.base + SE_GENI_STATUS);
	u32 geni_ios = readl_relaxed(gi2c->se.base + SE_GENI_IOS);
	u32 dma = readl_relaxed(gi2c->se.base + SE_GENI_DMA_MODE_EN);
	u32 rx_st, tx_st;

	if (dma) {
		rx_st = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
		tx_st = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
	} else {
		rx_st = readl_relaxed(gi2c->se.base + SE_GENI_RX_FIFO_STATUS);
		tx_st = readl_relaxed(gi2c->se.base + SE_GENI_TX_FIFO_STATUS);
	}
	dev_dbg(gi2c->se.dev, "DMA:%d tx_stat:0x%x, rx_stat:0x%x, irq-stat:0x%x\n",
		dma, tx_st, rx_st, m_stat);
	dev_dbg(gi2c->se.dev, "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n",
		m_cmd, geni_s, geni_ios);
}

static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err)
{
	if (!gi2c->err)
		gi2c->err = gi2c_log[err].err;
	if (gi2c->cur)
		dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n",
			gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags);

	switch (err) {
	case GENI_ABORT_DONE:
		gi2c->abort_done = true;
		break;
	case NACK:
	case GENI_TIMEOUT:
		dev_dbg(gi2c->se.dev, "%s\n", gi2c_log[err].msg);
		break;
	default:
		dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg);
		geni_i2c_err_misc(gi2c);
		break;
	}
}

static irqreturn_t geni_i2c_irq(int irq, void *dev)
{
	struct geni_i2c_dev *gi2c = dev;
	void __iomem *base = gi2c->se.base;
	int j, p;
	u32 m_stat;
	u32 rx_st;
	u32 dm_tx_st;
	u32 dm_rx_st;
	u32 dma;
	u32 val;
	struct i2c_msg *cur;

	spin_lock(&gi2c->lock);
	m_stat = readl_relaxed(base + SE_GENI_M_IRQ_STATUS);
	rx_st = readl_relaxed(base + SE_GENI_RX_FIFO_STATUS);
	dm_tx_st = readl_relaxed(base + SE_DMA_TX_IRQ_STAT);
	dm_rx_st = readl_relaxed(base + SE_DMA_RX_IRQ_STAT);
	dma = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
	cur = gi2c->cur;

	if (!cur ||
	    m_stat & (M_CMD_FAILURE_EN | M_CMD_ABORT_EN) ||
	    dm_rx_st & (DM_I2C_CB_ERR)) {
		if (m_stat & M_GP_IRQ_1_EN)
			geni_i2c_err(gi2c, NACK);
		if (m_stat & M_GP_IRQ_3_EN)
			geni_i2c_err(gi2c, BUS_PROTO);
		if (m_stat & M_GP_IRQ_4_EN)
			geni_i2c_err(gi2c, ARB_LOST);
		if (m_stat & M_CMD_OVERRUN_EN)
			geni_i2c_err(gi2c, GENI_OVERRUN);
		if (m_stat & M_ILLEGAL_CMD_EN)
			geni_i2c_err(gi2c, GENI_ILLEGAL_CMD);
		if (m_stat & M_CMD_ABORT_EN)
			geni_i2c_err(gi2c, GENI_ABORT_DONE);
		if (m_stat & M_GP_IRQ_0_EN)
			geni_i2c_err(gi2c, GP_IRQ0);

		/* Disable the TX Watermark interrupt to stop TX */
		if (!dma)
			writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
	} else if (dma) {
		dev_dbg(gi2c->se.dev, "i2c dma tx:0x%x, dma rx:0x%x\n",
			dm_tx_st, dm_rx_st);
	} else if (cur->flags & I2C_M_RD &&
		   m_stat & (M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN)) {
		u32 rxcnt = rx_st & RX_FIFO_WC_MSK;

		for (j = 0; j < rxcnt; j++) {
			p = 0;
			val = readl_relaxed(base + SE_GENI_RX_FIFOn);
			while (gi2c->cur_rd < cur->len && p < sizeof(val)) {
				cur->buf[gi2c->cur_rd++] = val & 0xff;
				val >>= 8;
				p++;
			}
			if (gi2c->cur_rd == cur->len)
				break;
		}
	} else if (!(cur->flags & I2C_M_RD) &&
		   m_stat & M_TX_FIFO_WATERMARK_EN) {
		for (j = 0; j < gi2c->tx_wm; j++) {
			u32 temp;

			val = 0;
			p = 0;
			while (gi2c->cur_wr < cur->len && p < sizeof(val)) {
				temp = cur->buf[gi2c->cur_wr++];
				val |= temp << (p * 8);
				p++;
			}
			writel_relaxed(val, base + SE_GENI_TX_FIFOn);
			/* TX Complete, Disable the TX Watermark interrupt */
			if (gi2c->cur_wr == cur->len) {
				writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
				break;
			}
		}
	}

	if (m_stat)
		writel_relaxed(m_stat, base + SE_GENI_M_IRQ_CLEAR);

	if (dma && dm_tx_st)
		writel_relaxed(dm_tx_st, base + SE_DMA_TX_IRQ_CLR);
	if (dma && dm_rx_st)
		writel_relaxed(dm_rx_st, base + SE_DMA_RX_IRQ_CLR);

	/* if this is err with done-bit not set, handle that through timeout. */
	if (m_stat & M_CMD_DONE_EN || m_stat & M_CMD_ABORT_EN ||
	    dm_tx_st & TX_DMA_DONE || dm_tx_st & TX_RESET_DONE ||
	    dm_rx_st & RX_DMA_DONE || dm_rx_st & RX_RESET_DONE)
		complete(&gi2c->done);

	spin_unlock(&gi2c->lock);

	return IRQ_HANDLED;
}

static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c)
{
	unsigned long time_left = ABORT_TIMEOUT;
	unsigned long flags;

	spin_lock_irqsave(&gi2c->lock, flags);
	geni_i2c_err(gi2c, GENI_TIMEOUT);
	gi2c->cur = NULL;
	gi2c->abort_done = false;
	geni_se_abort_m_cmd(&gi2c->se);
	spin_unlock_irqrestore(&gi2c->lock, flags);

	do {
		time_left = wait_for_completion_timeout(&gi2c->done, time_left);
	} while (!gi2c->abort_done && time_left);

	if (!time_left)
		dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n");
}

static void geni_i2c_rx_fsm_rst(struct geni_i2c_dev *gi2c)
{
	u32 val;
	unsigned long time_left = RST_TIMEOUT;

	writel_relaxed(1, gi2c->se.base + SE_DMA_RX_FSM_RST);
	do {
		time_left = wait_for_completion_timeout(&gi2c->done, time_left);
		val = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
	} while (!(val & RX_RESET_DONE) && time_left);

	if (!(val & RX_RESET_DONE))
		dev_err(gi2c->se.dev, "Timeout resetting RX_FSM\n");
}

static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c)
{
	u32 val;
	unsigned long time_left = RST_TIMEOUT;

	writel_relaxed(1, gi2c->se.base + SE_DMA_TX_FSM_RST);
	do {
		time_left = wait_for_completion_timeout(&gi2c->done, time_left);
		val = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
	} while (!(val & TX_RESET_DONE) && time_left);

	if (!(val & TX_RESET_DONE))
		dev_err(gi2c->se.dev, "Timeout resetting TX_FSM\n");
}

static void geni_i2c_rx_msg_cleanup(struct geni_i2c_dev *gi2c,
				     struct i2c_msg *cur)
{
	gi2c->cur_rd = 0;
	if (gi2c->dma_buf) {
		if (gi2c->err)
			geni_i2c_rx_fsm_rst(gi2c);
		geni_se_rx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len);
		i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err);
	}
}

static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c,
				     struct i2c_msg *cur)
{
	gi2c->cur_wr = 0;
	if (gi2c->dma_buf) {
		if (gi2c->err)
			geni_i2c_tx_fsm_rst(gi2c);
		geni_se_tx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len);
		i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err);
	}
}

static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
				u32 m_param)
{
	dma_addr_t rx_dma = 0;
	unsigned long time_left;
	void *dma_buf;
	struct geni_se *se = &gi2c->se;
	size_t len = msg->len;
	struct i2c_msg *cur;

	dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
	if (dma_buf)
		geni_se_select_mode(se, GENI_SE_DMA);
	else
		geni_se_select_mode(se, GENI_SE_FIFO);

	writel_relaxed(len, se->base + SE_I2C_RX_TRANS_LEN);
	geni_se_setup_m_cmd(se, I2C_READ, m_param);

	if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, len, &rx_dma)) {
		geni_se_select_mode(se, GENI_SE_FIFO);
		i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
		dma_buf = NULL;
	} else {
		gi2c->xfer_len = len;
		gi2c->dma_addr = rx_dma;
		gi2c->dma_buf = dma_buf;
	}

	cur = gi2c->cur;
	time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
	if (!time_left)
		geni_i2c_abort_xfer(gi2c);

	geni_i2c_rx_msg_cleanup(gi2c, cur);

	return gi2c->err;
}

static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
				u32 m_param)
{
	dma_addr_t tx_dma = 0;
	unsigned long time_left;
	void *dma_buf;
	struct geni_se *se = &gi2c->se;
	size_t len = msg->len;
	struct i2c_msg *cur;

	dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
	if (dma_buf)
		geni_se_select_mode(se, GENI_SE_DMA);
	else
		geni_se_select_mode(se, GENI_SE_FIFO);

	writel_relaxed(len, se->base + SE_I2C_TX_TRANS_LEN);
	geni_se_setup_m_cmd(se, I2C_WRITE, m_param);

	if (dma_buf && geni_se_tx_dma_prep(se, dma_buf, len, &tx_dma)) {
		geni_se_select_mode(se, GENI_SE_FIFO);
		i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
		dma_buf = NULL;
	} else {
		gi2c->xfer_len = len;
		gi2c->dma_addr = tx_dma;
		gi2c->dma_buf = dma_buf;
	}

	if (!dma_buf) /* Get FIFO IRQ */
		writel_relaxed(1, se->base + SE_GENI_TX_WATERMARK_REG);

	cur = gi2c->cur;
	time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
	if (!time_left)
		geni_i2c_abort_xfer(gi2c);

	geni_i2c_tx_msg_cleanup(gi2c, cur);

	return gi2c->err;
}

static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result)
{
	struct geni_i2c_dev *gi2c = cb;

	if (result->result != DMA_TRANS_NOERROR) {
		dev_err(gi2c->se.dev, "DMA txn failed:%d\n", result->result);
		gi2c->err = -EIO;
	} else if (result->residue) {
		dev_dbg(gi2c->se.dev, "DMA xfer has pending: %d\n", result->residue);
	}

	complete(&gi2c->done);
}

static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
			       void *tx_buf, dma_addr_t tx_addr,
			       void *rx_buf, dma_addr_t rx_addr)
{
	if (tx_buf) {
		dma_unmap_single(gi2c->se.dev->parent, tx_addr, msg->len, DMA_TO_DEVICE);
		i2c_put_dma_safe_msg_buf(tx_buf, msg, !gi2c->err);
	}

	if (rx_buf) {
		dma_unmap_single(gi2c->se.dev->parent, rx_addr, msg->len, DMA_FROM_DEVICE);
		i2c_put_dma_safe_msg_buf(rx_buf, msg, !gi2c->err);
	}
}

static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
			struct dma_slave_config *config, dma_addr_t *dma_addr_p,
			void **buf, unsigned int op, struct dma_chan *dma_chan)
{
	struct gpi_i2c_config *peripheral;
	unsigned int flags;
	void *dma_buf;
	dma_addr_t addr;
	enum dma_data_direction map_dirn;
	enum dma_transfer_direction dma_dirn;
	struct dma_async_tx_descriptor *desc;
	int ret;

	peripheral = config->peripheral_config;

	dma_buf = i2c_get_dma_safe_msg_buf(msg, 1);
	if (!dma_buf)
		return -ENOMEM;

	if (op == I2C_WRITE)
		map_dirn = DMA_TO_DEVICE;
	else
		map_dirn = DMA_FROM_DEVICE;

	addr = dma_map_single(gi2c->se.dev->parent, dma_buf, msg->len, map_dirn);
	if (dma_mapping_error(gi2c->se.dev->parent, addr)) {
		i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
		return -ENOMEM;
	}

	/* set the length as message for rx txn */
	peripheral->rx_len = msg->len;
	peripheral->op = op;

	ret = dmaengine_slave_config(dma_chan, config);
	if (ret) {
		dev_err(gi2c->se.dev, "dma config error: %d for op:%d\n", ret, op);
		goto err_config;
	}

	peripheral->set_config = 0;
	peripheral->multi_msg = true;
	flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;

	if (op == I2C_WRITE)
		dma_dirn = DMA_MEM_TO_DEV;
	else
		dma_dirn = DMA_DEV_TO_MEM;

	desc = dmaengine_prep_slave_single(dma_chan, addr, msg->len, dma_dirn, flags);
	if (!desc) {
		dev_err(gi2c->se.dev, "prep_slave_sg failed\n");
		ret = -EIO;
		goto err_config;
	}

	desc->callback_result = i2c_gpi_cb_result;
	desc->callback_param = gi2c;

	dmaengine_submit(desc);
	*buf = dma_buf;
	*dma_addr_p = addr;

	return 0;

err_config:
	dma_unmap_single(gi2c->se.dev->parent, addr, msg->len, map_dirn);
	i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
	return ret;
}

static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], int num)
{
	struct dma_slave_config config = {};
	struct gpi_i2c_config peripheral = {};
	int i, ret = 0, timeout;
	dma_addr_t tx_addr, rx_addr;
	void *tx_buf = NULL, *rx_buf = NULL;
	const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;

	config.peripheral_config = &peripheral;
	config.peripheral_size = sizeof(peripheral);

	peripheral.pack_enable = I2C_PACK_TX | I2C_PACK_RX;
	peripheral.cycle_count = itr->t_cycle_cnt;
	peripheral.high_count = itr->t_high_cnt;
	peripheral.low_count = itr->t_low_cnt;
	peripheral.clk_div = itr->clk_div;
	peripheral.set_config = 1;
	peripheral.multi_msg = false;

	for (i = 0; i < num; i++) {
		gi2c->cur = &msgs[i];
		gi2c->err = 0;
		dev_dbg(gi2c->se.dev, "msg[%d].len:%d\n", i, gi2c->cur->len);

		peripheral.stretch = 0;
		if (i < num - 1)
			peripheral.stretch = 1;

		peripheral.addr = msgs[i].addr;

		if (msgs[i].flags & I2C_M_RD) {
			ret =  geni_i2c_gpi(gi2c, &msgs[i], &config,
					    &rx_addr, &rx_buf, I2C_READ, gi2c->rx_c);
			if (ret)
				goto err;
		}

		ret =  geni_i2c_gpi(gi2c, &msgs[i], &config,
				    &tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c);
		if (ret)
			goto err;

		if (msgs[i].flags & I2C_M_RD)
			dma_async_issue_pending(gi2c->rx_c);
		dma_async_issue_pending(gi2c->tx_c);

		timeout = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
		if (!timeout) {
			dev_err(gi2c->se.dev, "I2C timeout gpi flags:%d addr:0x%x\n",
				gi2c->cur->flags, gi2c->cur->addr);
			gi2c->err = -ETIMEDOUT;
		}

		if (gi2c->err) {
			ret = gi2c->err;
			goto err;
		}

		geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
	}

	return num;

err:
	dev_err(gi2c->se.dev, "GPI transfer failed: %d\n", ret);
	dmaengine_terminate_sync(gi2c->rx_c);
	dmaengine_terminate_sync(gi2c->tx_c);
	geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
	return ret;
}

static int geni_i2c_fifo_xfer(struct geni_i2c_dev *gi2c,
			      struct i2c_msg msgs[], int num)
{
	int i, ret = 0;

	for (i = 0; i < num; i++) {
		u32 m_param = i < (num - 1) ? STOP_STRETCH : 0;

		m_param |= ((msgs[i].addr << SLV_ADDR_SHFT) & SLV_ADDR_MSK);

		gi2c->cur = &msgs[i];
		if (msgs[i].flags & I2C_M_RD)
			ret = geni_i2c_rx_one_msg(gi2c, &msgs[i], m_param);
		else
			ret = geni_i2c_tx_one_msg(gi2c, &msgs[i], m_param);

		if (ret)
			return ret;
	}

	return num;
}

static int geni_i2c_xfer(struct i2c_adapter *adap,
			 struct i2c_msg msgs[],
			 int num)
{
	struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);
	int ret;

	gi2c->err = 0;
	reinit_completion(&gi2c->done);
	ret = pm_runtime_get_sync(gi2c->se.dev);
	if (ret < 0) {
		dev_err(gi2c->se.dev, "error turning SE resources:%d\n", ret);
		pm_runtime_put_noidle(gi2c->se.dev);
		/* Set device in suspended since resume failed */
		pm_runtime_set_suspended(gi2c->se.dev);
		return ret;
	}

	qcom_geni_i2c_conf(gi2c);

	if (gi2c->gpi_mode)
		ret = geni_i2c_gpi_xfer(gi2c, msgs, num);
	else
		ret = geni_i2c_fifo_xfer(gi2c, msgs, num);

	pm_runtime_mark_last_busy(gi2c->se.dev);
	pm_runtime_put_autosuspend(gi2c->se.dev);
	gi2c->cur = NULL;
	gi2c->err = 0;
	return ret;
}

static u32 geni_i2c_func(struct i2c_adapter *adap)
{
	return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
}

static const struct i2c_algorithm geni_i2c_algo = {
	.master_xfer	= geni_i2c_xfer,
	.functionality	= geni_i2c_func,
};

#ifdef CONFIG_ACPI
static const struct acpi_device_id geni_i2c_acpi_match[] = {
	{ "QCOM0220"},
	{ "QCOM0411" },
	{ },
};
MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
#endif

static void release_gpi_dma(struct geni_i2c_dev *gi2c)
{
	if (gi2c->rx_c)
		dma_release_channel(gi2c->rx_c);

	if (gi2c->tx_c)
		dma_release_channel(gi2c->tx_c);
}

static int setup_gpi_dma(struct geni_i2c_dev *gi2c)
{
	int ret;

	geni_se_select_mode(&gi2c->se, GENI_GPI_DMA);
	gi2c->tx_c = dma_request_chan(gi2c->se.dev, "tx");
	if (IS_ERR(gi2c->tx_c)) {
		ret = dev_err_probe(gi2c->se.dev, PTR_ERR(gi2c->tx_c),
				    "Failed to get tx DMA ch\n");
		goto err_tx;
	}

	gi2c->rx_c = dma_request_chan(gi2c->se.dev, "rx");
	if (IS_ERR(gi2c->rx_c)) {
		ret = dev_err_probe(gi2c->se.dev, PTR_ERR(gi2c->rx_c),
				    "Failed to get rx DMA ch\n");
		goto err_rx;
	}

	dev_dbg(gi2c->se.dev, "Grabbed GPI dma channels\n");
	return 0;

err_rx:
	dma_release_channel(gi2c->tx_c);
err_tx:
	return ret;
}

static int geni_i2c_probe(struct platform_device *pdev)
{
	struct geni_i2c_dev *gi2c;
	u32 proto, tx_depth, fifo_disable;
	int ret;
	struct device *dev = &pdev->dev;
	const struct geni_i2c_desc *desc = NULL;

	gi2c = devm_kzalloc(dev, sizeof(*gi2c), GFP_KERNEL);
	if (!gi2c)
		return -ENOMEM;

	gi2c->se.dev = dev;
	gi2c->se.wrapper = dev_get_drvdata(dev->parent);
	gi2c->se.base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(gi2c->se.base))
		return PTR_ERR(gi2c->se.base);

	desc = device_get_match_data(&pdev->dev);

	if (desc && desc->has_core_clk) {
		gi2c->core_clk = devm_clk_get(dev, "core");
		if (IS_ERR(gi2c->core_clk))
			return PTR_ERR(gi2c->core_clk);
	}

	gi2c->se.clk = devm_clk_get(dev, "se");
	if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(dev))
		return PTR_ERR(gi2c->se.clk);

	ret = device_property_read_u32(dev, "clock-frequency",
				       &gi2c->clk_freq_out);
	if (ret) {
		dev_info(dev, "Bus frequency not specified, default to 100kHz.\n");
		gi2c->clk_freq_out = KHZ(100);
	}

	if (has_acpi_companion(dev))
		ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(dev));

	gi2c->irq = platform_get_irq(pdev, 0);
	if (gi2c->irq < 0)
		return gi2c->irq;

	ret = geni_i2c_clk_map_idx(gi2c);
	if (ret) {
		dev_err(dev, "Invalid clk frequency %d Hz: %d\n",
			gi2c->clk_freq_out, ret);
		return ret;
	}

	gi2c->adap.algo = &geni_i2c_algo;
	init_completion(&gi2c->done);
	spin_lock_init(&gi2c->lock);
	platform_set_drvdata(pdev, gi2c);
	ret = devm_request_irq(dev, gi2c->irq, geni_i2c_irq, 0,
			       dev_name(dev), gi2c);
	if (ret) {
		dev_err(dev, "Request_irq failed:%d: err:%d\n",
			gi2c->irq, ret);
		return ret;
	}
	/* Disable the interrupt so that the system can enter low-power mode */
	disable_irq(gi2c->irq);
	i2c_set_adapdata(&gi2c->adap, gi2c);
	gi2c->adap.dev.parent = dev;
	gi2c->adap.dev.of_node = dev->of_node;
	strscpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));

	ret = geni_icc_get(&gi2c->se, desc ? desc->icc_ddr : "qup-memory");
	if (ret)
		return ret;
	/*
	 * Set the bus quota for core and cpu to a reasonable value for
	 * register access.
	 * Set quota for DDR based on bus speed.
	 */
	gi2c->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
	gi2c->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
	if (!desc || desc->icc_ddr)
		gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);

	ret = geni_icc_set_bw(&gi2c->se);
	if (ret)
		return ret;

	ret = clk_prepare_enable(gi2c->core_clk);
	if (ret)
		return ret;

	ret = geni_se_resources_on(&gi2c->se);
	if (ret) {
		dev_err(dev, "Error turning on resources %d\n", ret);
		clk_disable_unprepare(gi2c->core_clk);
		return ret;
	}
	proto = geni_se_read_proto(&gi2c->se);
	if (proto != GENI_SE_I2C) {
		dev_err(dev, "Invalid proto %d\n", proto);
		geni_se_resources_off(&gi2c->se);
		clk_disable_unprepare(gi2c->core_clk);
		return -ENXIO;
	}

	if (desc && desc->no_dma_support)
		fifo_disable = false;
	else
		fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;

	if (fifo_disable) {
		/* FIFO is disabled, so we can only use GPI DMA */
		gi2c->gpi_mode = true;
		ret = setup_gpi_dma(gi2c);
		if (ret) {
			geni_se_resources_off(&gi2c->se);
			clk_disable_unprepare(gi2c->core_clk);
			return dev_err_probe(dev, ret, "Failed to setup GPI DMA mode\n");
		}

		dev_dbg(dev, "Using GPI DMA mode for I2C\n");
	} else {
		gi2c->gpi_mode = false;
		tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);

		/* I2C Master Hub Serial Elements doesn't have the HW_PARAM_0 register */
		if (!tx_depth && desc)
			tx_depth = desc->tx_fifo_depth;

		if (!tx_depth) {
			dev_err(dev, "Invalid TX FIFO depth\n");
			geni_se_resources_off(&gi2c->se);
			clk_disable_unprepare(gi2c->core_clk);
			return -EINVAL;
		}

		gi2c->tx_wm = tx_depth - 1;
		geni_se_init(&gi2c->se, gi2c->tx_wm, tx_depth);
		geni_se_config_packing(&gi2c->se, BITS_PER_BYTE,
				       PACKING_BYTES_PW, true, true, true);

		dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
	}

	clk_disable_unprepare(gi2c->core_clk);
	ret = geni_se_resources_off(&gi2c->se);
	if (ret) {
		dev_err(dev, "Error turning off resources %d\n", ret);
		goto err_dma;
	}

	ret = geni_icc_disable(&gi2c->se);
	if (ret)
		goto err_dma;

	gi2c->suspended = 1;
	pm_runtime_set_suspended(gi2c->se.dev);
	pm_runtime_set_autosuspend_delay(gi2c->se.dev, I2C_AUTO_SUSPEND_DELAY);
	pm_runtime_use_autosuspend(gi2c->se.dev);
	pm_runtime_enable(gi2c->se.dev);

	ret = i2c_add_adapter(&gi2c->adap);
	if (ret) {
		dev_err(dev, "Error adding i2c adapter %d\n", ret);
		pm_runtime_disable(gi2c->se.dev);
		goto err_dma;
	}

	dev_dbg(dev, "Geni-I2C adaptor successfully added\n");

	return 0;

err_dma:
	release_gpi_dma(gi2c);
	return ret;
}

static void geni_i2c_remove(struct platform_device *pdev)
{
	struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);

	i2c_del_adapter(&gi2c->adap);
	release_gpi_dma(gi2c);
	pm_runtime_disable(gi2c->se.dev);
}

static void geni_i2c_shutdown(struct platform_device *pdev)
{
	struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);

	/* Make client i2c transfers start failing */
	i2c_mark_adapter_suspended(&gi2c->adap);
}

static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
{
	int ret;
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	disable_irq(gi2c->irq);
	ret = geni_se_resources_off(&gi2c->se);
	if (ret) {
		enable_irq(gi2c->irq);
		return ret;

	} else {
		gi2c->suspended = 1;
	}

	clk_disable_unprepare(gi2c->core_clk);

	return geni_icc_disable(&gi2c->se);
}

static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
{
	int ret;
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	ret = geni_icc_enable(&gi2c->se);
	if (ret)
		return ret;

	ret = clk_prepare_enable(gi2c->core_clk);
	if (ret)
		return ret;

	ret = geni_se_resources_on(&gi2c->se);
	if (ret)
		return ret;

	enable_irq(gi2c->irq);
	gi2c->suspended = 0;
	return 0;
}

static int __maybe_unused geni_i2c_suspend_noirq(struct device *dev)
{
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	i2c_mark_adapter_suspended(&gi2c->adap);

	if (!gi2c->suspended) {
		geni_i2c_runtime_suspend(dev);
		pm_runtime_disable(dev);
		pm_runtime_set_suspended(dev);
		pm_runtime_enable(dev);
	}
	return 0;
}

static int __maybe_unused geni_i2c_resume_noirq(struct device *dev)
{
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	i2c_mark_adapter_resumed(&gi2c->adap);
	return 0;
}

static const struct dev_pm_ops geni_i2c_pm_ops = {
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(geni_i2c_suspend_noirq, geni_i2c_resume_noirq)
	SET_RUNTIME_PM_OPS(geni_i2c_runtime_suspend, geni_i2c_runtime_resume,
									NULL)
};

static const struct geni_i2c_desc i2c_master_hub = {
	.has_core_clk = true,
	.icc_ddr = NULL,
	.no_dma_support = true,
	.tx_fifo_depth = 16,
};

static const struct of_device_id geni_i2c_dt_match[] = {
	{ .compatible = "qcom,geni-i2c" },
	{ .compatible = "qcom,geni-i2c-master-hub", .data = &i2c_master_hub },
	{}
};
MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);

static struct platform_driver geni_i2c_driver = {
	.probe  = geni_i2c_probe,
	.remove_new = geni_i2c_remove,
	.shutdown = geni_i2c_shutdown,
	.driver = {
		.name = "geni_i2c",
		.pm = &geni_i2c_pm_ops,
		.of_match_table = geni_i2c_dt_match,
		.acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
	},
};

module_platform_driver(geni_i2c_driver);

MODULE_DESCRIPTION("I2C Controller Driver for GENI based QUP cores");
MODULE_LICENSE("GPL v2");