summaryrefslogtreecommitdiffstats
path: root/drivers/i2c/busses/i2c-tegra.c
blob: d56c0def6528419ce8618a19571b4487ac49aa5e (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
/*
 * Copyright (C) 2014 Lucas Stach <l.stach@pengutronix.de>
 *
 * Partly based on code Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#include <common.h>
#include <clock.h>
#include <init.h>
#include <io.h>
#include <malloc.h>
#include <i2c/i2c.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/reset.h>

#include <asm/unaligned.h>

#define TEGRA_I2C_TIMEOUT (msecs_to_jiffies(1000))
#define BYTES_PER_FIFO_WORD 4

#define I2C_CNFG				0x000
#define I2C_CNFG_DEBOUNCE_CNT_SHIFT		12
#define I2C_CNFG_PACKET_MODE_EN			(1<<10)
#define I2C_CNFG_NEW_MASTER_FSM			(1<<11)
#define I2C_STATUS				0x01C
#define I2C_SL_CNFG				0x020
#define I2C_SL_CNFG_NACK			(1<<1)
#define I2C_SL_CNFG_NEWSL			(1<<2)
#define I2C_SL_ADDR1				0x02c
#define I2C_SL_ADDR2				0x030
#define I2C_TX_FIFO				0x050
#define I2C_RX_FIFO				0x054
#define I2C_PACKET_TRANSFER_STATUS		0x058
#define I2C_FIFO_CONTROL			0x05c
#define I2C_FIFO_CONTROL_TX_FLUSH		(1<<1)
#define I2C_FIFO_CONTROL_RX_FLUSH		(1<<0)
#define I2C_FIFO_CONTROL_TX_TRIG_SHIFT		5
#define I2C_FIFO_CONTROL_RX_TRIG_SHIFT		2
#define I2C_FIFO_STATUS				0x060
#define I2C_FIFO_STATUS_TX_MASK			0xF0
#define I2C_FIFO_STATUS_TX_SHIFT		4
#define I2C_FIFO_STATUS_RX_MASK			0x0F
#define I2C_FIFO_STATUS_RX_SHIFT		0
#define I2C_INT_MASK				0x064
#define I2C_INT_STATUS				0x068
#define I2C_INT_PACKET_XFER_COMPLETE		(1<<7)
#define I2C_INT_ALL_PACKETS_XFER_COMPLETE	(1<<6)
#define I2C_INT_TX_FIFO_OVERFLOW		(1<<5)
#define I2C_INT_RX_FIFO_UNDERFLOW		(1<<4)
#define I2C_INT_NO_ACK				(1<<3)
#define I2C_INT_ARBITRATION_LOST		(1<<2)
#define I2C_INT_TX_FIFO_DATA_REQ		(1<<1)
#define I2C_INT_RX_FIFO_DATA_REQ		(1<<0)
#define I2C_CLK_DIVISOR				0x06c
#define I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT	16
#define I2C_CLK_MULTIPLIER_STD_FAST_MODE	8

#define DVC_CTRL_REG1				0x000
#define DVC_CTRL_REG1_INTR_EN			(1<<10)
#define DVC_CTRL_REG2				0x004
#define DVC_CTRL_REG3				0x008
#define DVC_CTRL_REG3_SW_PROG			(1<<26)
#define DVC_CTRL_REG3_I2C_DONE_INTR_EN		(1<<30)
#define DVC_STATUS				0x00c
#define DVC_STATUS_I2C_DONE_INTR		(1<<30)

#define I2C_ERR_NONE				0x00
#define I2C_ERR_NO_ACK				0x01
#define I2C_ERR_ARBITRATION_LOST		0x02
#define I2C_ERR_UNKNOWN_INTERRUPT		0x04

#define PACKET_HEADER0_HEADER_SIZE_SHIFT	28
#define PACKET_HEADER0_PACKET_ID_SHIFT		16
#define PACKET_HEADER0_CONT_ID_SHIFT		12
#define PACKET_HEADER0_PROTOCOL_I2C		(1<<4)

#define I2C_HEADER_HIGHSPEED_MODE		(1<<22)
#define I2C_HEADER_CONT_ON_NAK			(1<<21)
#define I2C_HEADER_SEND_START_BYTE		(1<<20)
#define I2C_HEADER_READ				(1<<19)
#define I2C_HEADER_10BIT_ADDR			(1<<18)
#define I2C_HEADER_IE_ENABLE			(1<<17)
#define I2C_HEADER_REPEAT_START			(1<<16)
#define I2C_HEADER_CONTINUE_XFER		(1<<15)
#define I2C_HEADER_MASTER_ADDR_SHIFT		12
#define I2C_HEADER_SLAVE_ADDR_SHIFT		1
/*
 * msg_end_type: The bus control which need to be send at end of transfer.
 * @MSG_END_STOP: Send stop pulse at end of transfer.
 * @MSG_END_REPEAT_START: Send repeat start at end of transfer.
 * @MSG_END_CONTINUE: The following on message is coming and so do not send
 *		stop or repeat start.
 */
enum msg_end_type {
	MSG_END_STOP,
	MSG_END_REPEAT_START,
	MSG_END_CONTINUE,
};

/**
 * struct tegra_i2c_hw_feature : Different HW support on Tegra
 * @has_continue_xfer_support: Continue transfer supports.
 * @has_per_pkt_xfer_complete_irq: Has enable/disable capability for transfer
 *		complete interrupt per packet basis.
 * @has_single_clk_source: The i2c controller has single clock source. Tegra30
 *		and earlier Socs has two clock sources i.e. div-clk and
 *		fast-clk.
 * @clk_divisor_hs_mode: Clock divisor in HS mode.
 * @clk_divisor_std_fast_mode: Clock divisor in standard/fast mode. It is
 *		applicable if there is no fast clock source i.e. single clock
 *		source.
 */

struct tegra_i2c_hw_feature {
	bool has_continue_xfer_support;
	bool has_per_pkt_xfer_complete_irq;
	bool has_single_clk_source;
	int clk_divisor_hs_mode;
	int clk_divisor_std_fast_mode;
};

/**
 * struct tegra_i2c_dev	- per device i2c context
 * @dev: device reference for power management
 * @hw: Tegra i2c hw feature.
 * @adapter: core i2c layer adapter information
 * @div_clk: clock reference for div clock of i2c controller.
 * @fast_clk: clock reference for fast clock of i2c controller.
 * @base: ioremapped registers cookie
 * @is_dvc: identifies the DVC i2c controller, has a different register layout
 * @msg_err: error code for completed message
 * @msg_buf: pointer to current message data
 * @msg_buf_remaining: size of unsent data in the message buffer
 * @msg_read: identifies read transfers
 * @bus_clk_rate: current i2c bus clock rate
 */
struct tegra_i2c_dev {
	struct device_d *dev;
	const struct tegra_i2c_hw_feature *hw;
	struct i2c_adapter adapter;
	struct clk *div_clk;
	struct clk *fast_clk;
	struct reset_control *rst;
	void __iomem *base;
	int is_dvc;
	int msg_err;
	u8 *msg_buf;
	size_t msg_buf_remaining;
	int msg_read;
	u32 bus_clk_rate;
};
#define to_tegra_i2c_dev(a)	container_of(a, struct tegra_i2c_dev, adapter)

static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg)
{
	writel(val, i2c_dev->base + reg);
}

static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
{
	return readl(i2c_dev->base + reg);
}

/*
 * i2c_writel and i2c_readl will offset the register if necessary to talk
 * to the I2C block inside the DVC block
 */
static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
	unsigned long reg)
{
	if (i2c_dev->is_dvc)
		reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
	return reg;
}

static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
	unsigned long reg)
{
	writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));

	/* Read back register to make sure that register writes completed */
	if (reg != I2C_TX_FIFO)
		readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
}

static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
{
	return readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
}

static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data,
	unsigned long reg, int len)
{
	writesl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
}

static void i2c_readsl(struct tegra_i2c_dev *i2c_dev, void *data,
	unsigned long reg, int len)
{
	readsl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
}

static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
{
	uint64_t start = get_time_ns();
	u32 val = i2c_readl(i2c_dev, I2C_FIFO_CONTROL);
	val |= I2C_FIFO_CONTROL_TX_FLUSH | I2C_FIFO_CONTROL_RX_FLUSH;
	i2c_writel(i2c_dev, val, I2C_FIFO_CONTROL);

	while (i2c_readl(i2c_dev, I2C_FIFO_CONTROL) &
		(I2C_FIFO_CONTROL_TX_FLUSH | I2C_FIFO_CONTROL_RX_FLUSH)) {
		if (is_timeout(start, SECOND)) {
			dev_warn(i2c_dev->dev, "timeout waiting for fifo flush\n");
			return -ETIMEDOUT;
		}
		mdelay(1);
	}
	return 0;
}

static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
{
	u32 val;
	int rx_fifo_avail;
	u8 *buf = i2c_dev->msg_buf;
	size_t buf_remaining = i2c_dev->msg_buf_remaining;
	int words_to_transfer;

	val = i2c_readl(i2c_dev, I2C_FIFO_STATUS);
	rx_fifo_avail = (val & I2C_FIFO_STATUS_RX_MASK) >>
		I2C_FIFO_STATUS_RX_SHIFT;

	/* Rounds down to not include partial word at the end of buf */
	words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
	if (words_to_transfer > rx_fifo_avail)
		words_to_transfer = rx_fifo_avail;

	i2c_readsl(i2c_dev, buf, I2C_RX_FIFO, words_to_transfer);

	buf += words_to_transfer * BYTES_PER_FIFO_WORD;
	buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
	rx_fifo_avail -= words_to_transfer;

	/*
	 * If there is a partial word at the end of buf, handle it manually to
	 * prevent overwriting past the end of buf
	 */
	if (rx_fifo_avail > 0 && buf_remaining > 0) {
		BUG_ON(buf_remaining > 3);
		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
		memcpy(buf, &val, buf_remaining);
		buf_remaining = 0;
		rx_fifo_avail--;
	}

	BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
	i2c_dev->msg_buf_remaining = buf_remaining;
	i2c_dev->msg_buf = buf;
	return 0;
}

static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
{
	u32 val;
	int tx_fifo_avail;
	u8 *buf = i2c_dev->msg_buf;
	size_t buf_remaining = i2c_dev->msg_buf_remaining;
	int words_to_transfer;

	val = i2c_readl(i2c_dev, I2C_FIFO_STATUS);
	tx_fifo_avail = (val & I2C_FIFO_STATUS_TX_MASK) >>
		I2C_FIFO_STATUS_TX_SHIFT;

	/* Rounds down to not include partial word at the end of buf */
	words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;

	/* It's very common to have < 4 bytes, so optimize that case. */
	if (words_to_transfer) {
		if (words_to_transfer > tx_fifo_avail)
			words_to_transfer = tx_fifo_avail;

		/*
		 * Update state before writing to FIFO.  If this casues us
		 * to finish writing all bytes (AKA buf_remaining goes to 0) we
		 * have a potential for an interrupt (PACKET_XFER_COMPLETE is
		 * not maskable).  We need to make sure that the isr sees
		 * buf_remaining as 0 and doesn't call us back re-entrantly.
		 */
		buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
		tx_fifo_avail -= words_to_transfer;
		i2c_dev->msg_buf_remaining = buf_remaining;
		i2c_dev->msg_buf = buf +
			words_to_transfer * BYTES_PER_FIFO_WORD;
		barrier();

		i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);

		buf += words_to_transfer * BYTES_PER_FIFO_WORD;
	}

	/*
	 * If there is a partial word at the end of buf, handle it manually to
	 * prevent reading past the end of buf, which could cross a page
	 * boundary and fault.
	 */
	if (tx_fifo_avail > 0 && buf_remaining > 0) {
		BUG_ON(buf_remaining > 3);
		memcpy(&val, buf, buf_remaining);

		/* Again update before writing to FIFO to make sure isr sees. */
		i2c_dev->msg_buf_remaining = 0;
		i2c_dev->msg_buf = NULL;
		barrier();

		i2c_writel(i2c_dev, val, I2C_TX_FIFO);
	}

	return 0;
}

/*
 * One of the Tegra I2C blocks is inside the DVC (Digital Voltage Controller)
 * block.  This block is identical to the rest of the I2C blocks, except that
 * it only supports master mode, it has registers moved around, and it needs
 * some extra init to get it into I2C mode.  The register moves are handled
 * by i2c_readl and i2c_writel
 */
static void tegra_dvc_init(struct tegra_i2c_dev *i2c_dev)
{
	u32 val = 0;
	val = dvc_readl(i2c_dev, DVC_CTRL_REG3);
	val |= DVC_CTRL_REG3_SW_PROG;
	val |= DVC_CTRL_REG3_I2C_DONE_INTR_EN;
	dvc_writel(i2c_dev, val, DVC_CTRL_REG3);

	val = dvc_readl(i2c_dev, DVC_CTRL_REG1);
	val |= DVC_CTRL_REG1_INTR_EN;
	dvc_writel(i2c_dev, val, DVC_CTRL_REG1);
}

static inline int tegra_i2c_clock_enable(struct tegra_i2c_dev *i2c_dev)
{
	int ret;
	if (!i2c_dev->hw->has_single_clk_source) {
		ret = clk_enable(i2c_dev->fast_clk);
		if (ret < 0) {
			dev_err(i2c_dev->dev,
				"Enabling fast clk failed, err %d\n", ret);
			return ret;
		}
	}
	ret = clk_enable(i2c_dev->div_clk);
	if (ret < 0) {
		dev_err(i2c_dev->dev,
			"Enabling div clk failed, err %d\n", ret);
		clk_disable(i2c_dev->fast_clk);
	}
	return ret;
}

static inline void tegra_i2c_clock_disable(struct tegra_i2c_dev *i2c_dev)
{
	clk_disable(i2c_dev->div_clk);
	if (!i2c_dev->hw->has_single_clk_source)
		clk_disable(i2c_dev->fast_clk);
}

static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
{
	u32 val;
	int err = 0;
	int clk_multiplier = I2C_CLK_MULTIPLIER_STD_FAST_MODE;
	u32 clk_divisor;

	err = tegra_i2c_clock_enable(i2c_dev);
	if (err < 0) {
		dev_err(i2c_dev->dev, "Clock enable failed %d\n", err);
		return err;
	}

	reset_control_assert(i2c_dev->rst);
	udelay(2);
	reset_control_deassert(i2c_dev->rst);

	if (i2c_dev->is_dvc)
		tegra_dvc_init(i2c_dev);

	val = I2C_CNFG_NEW_MASTER_FSM | I2C_CNFG_PACKET_MODE_EN |
		(0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
	i2c_writel(i2c_dev, val, I2C_CNFG);
	i2c_writel(i2c_dev, 0, I2C_INT_MASK);

	clk_multiplier *= (i2c_dev->hw->clk_divisor_std_fast_mode + 1);
	clk_set_rate(i2c_dev->div_clk, i2c_dev->bus_clk_rate * clk_multiplier);

	/* Make sure clock divisor programmed correctly */
	clk_divisor = i2c_dev->hw->clk_divisor_hs_mode;
	clk_divisor |= i2c_dev->hw->clk_divisor_std_fast_mode <<
					I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT;
	i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR);

	if (!i2c_dev->is_dvc) {
		u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
		sl_cfg |= I2C_SL_CNFG_NACK | I2C_SL_CNFG_NEWSL;
		i2c_writel(i2c_dev, sl_cfg, I2C_SL_CNFG);
		i2c_writel(i2c_dev, 0xfc, I2C_SL_ADDR1);
		i2c_writel(i2c_dev, 0x00, I2C_SL_ADDR2);
	}

	val = 7 << I2C_FIFO_CONTROL_TX_TRIG_SHIFT |
		0 << I2C_FIFO_CONTROL_RX_TRIG_SHIFT;
	i2c_writel(i2c_dev, val, I2C_FIFO_CONTROL);

	if (tegra_i2c_flush_fifos(i2c_dev))
		err = -ETIMEDOUT;

	tegra_i2c_clock_disable(i2c_dev);

	return err;
}

static int tegra_i2c_wait_completion(struct tegra_i2c_dev *i2c_dev)
{
	u32 status;
	const u32 status_err = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
	uint64_t start = get_time_ns();

	while (!is_timeout(start, SECOND)) {

		status = i2c_readl(i2c_dev, I2C_INT_STATUS);

		if (unlikely(status & status_err)) {
			if (status & I2C_INT_NO_ACK)
				i2c_dev->msg_err |= I2C_ERR_NO_ACK;
			if (status & I2C_INT_ARBITRATION_LOST)
				i2c_dev->msg_err |= I2C_ERR_ARBITRATION_LOST;
			goto err;
		}

		if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
			if (i2c_dev->msg_buf_remaining)
				tegra_i2c_empty_rx_fifo(i2c_dev);
			else
				BUG();
		}

		if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
			if (i2c_dev->msg_buf_remaining)
				tegra_i2c_fill_tx_fifo(i2c_dev);
		}

		i2c_writel(i2c_dev, status, I2C_INT_STATUS);
		if (i2c_dev->is_dvc)
			dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR,
			           DVC_STATUS);

		if (status & I2C_INT_PACKET_XFER_COMPLETE) {
			BUG_ON(i2c_dev->msg_buf_remaining);
			return 0;
		}
	}
	return -ETIMEDOUT;

err:
	i2c_writel(i2c_dev, status, I2C_INT_STATUS);
	if (i2c_dev->is_dvc)
		dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);

	return 0;
}

static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
	struct i2c_msg *msg, enum msg_end_type end_state)
{
	u32 packet_header;
	int ret;

	tegra_i2c_flush_fifos(i2c_dev);

	if (msg->len == 0)
		return -EINVAL;

	i2c_dev->msg_buf = msg->buf;
	i2c_dev->msg_buf_remaining = msg->len;
	i2c_dev->msg_err = I2C_ERR_NONE;
	i2c_dev->msg_read = (msg->flags & I2C_M_RD);

	packet_header = (0 << PACKET_HEADER0_HEADER_SIZE_SHIFT) |
			PACKET_HEADER0_PROTOCOL_I2C |
			(i2c_dev->adapter.nr << PACKET_HEADER0_CONT_ID_SHIFT) |
			(1 << PACKET_HEADER0_PACKET_ID_SHIFT);
	i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);

	packet_header = msg->len - 1;
	i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);

	packet_header = I2C_HEADER_IE_ENABLE;
	if (end_state == MSG_END_CONTINUE)
		packet_header |= I2C_HEADER_CONTINUE_XFER;
	else if (end_state == MSG_END_REPEAT_START)
		packet_header |= I2C_HEADER_REPEAT_START;
	if (msg->flags & I2C_M_TEN) {
		packet_header |= msg->addr;
		packet_header |= I2C_HEADER_10BIT_ADDR;
	} else {
		packet_header |= msg->addr << I2C_HEADER_SLAVE_ADDR_SHIFT;
	}
	if (msg->flags & I2C_M_IGNORE_NAK)
		packet_header |= I2C_HEADER_CONT_ON_NAK;
	if (msg->flags & I2C_M_RD)
		packet_header |= I2C_HEADER_READ;
	i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);

	if (!(msg->flags & I2C_M_RD))
		tegra_i2c_fill_tx_fifo(i2c_dev);

	ret = tegra_i2c_wait_completion(i2c_dev);
	if (ret) {
		dev_err(i2c_dev->dev, "i2c transfer timed out\n");

		tegra_i2c_init(i2c_dev);
		return -ETIMEDOUT;
	}

	if (likely(i2c_dev->msg_err == I2C_ERR_NONE))
		return 0;

	/*
	 * NACK interrupt is generated before the I2C controller generates the
	 * STOP condition on the bus. So wait for 2 clock periods before resetting
	 * the controller so that STOP condition has been delivered properly.
	 */
	if (i2c_dev->msg_err == I2C_ERR_NO_ACK)
		udelay(DIV_ROUND_UP(2 * 1000000, i2c_dev->bus_clk_rate));

	tegra_i2c_init(i2c_dev);
	if (i2c_dev->msg_err == I2C_ERR_NO_ACK) {
		if (msg->flags & I2C_M_IGNORE_NAK)
			return 0;
		return -EREMOTEIO;
	}

	return -EIO;
}

static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
	int num)
{
	struct tegra_i2c_dev *i2c_dev = to_tegra_i2c_dev(adap);
	int i;
	int ret = 0;

	ret = tegra_i2c_clock_enable(i2c_dev);
	if (ret < 0) {
		dev_err(i2c_dev->dev, "Clock enable failed %d\n", ret);
		return ret;
	}

	for (i = 0; i < num; i++) {
		enum msg_end_type end_type = MSG_END_STOP;
		if (i < (num - 1))
			end_type = MSG_END_REPEAT_START;
		ret = tegra_i2c_xfer_msg(i2c_dev, &msgs[i], end_type);
		if (ret)
			break;
	}
	tegra_i2c_clock_disable(i2c_dev);
	return ret ? ret : i;
}

static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
	.has_continue_xfer_support = false,
	.has_per_pkt_xfer_complete_irq = false,
	.has_single_clk_source = false,
	.clk_divisor_hs_mode = 3,
	.clk_divisor_std_fast_mode = 0,
};

static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
	.has_continue_xfer_support = true,
	.has_per_pkt_xfer_complete_irq = false,
	.has_single_clk_source = false,
	.clk_divisor_hs_mode = 3,
	.clk_divisor_std_fast_mode = 0,
};

static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
	.has_continue_xfer_support = true,
	.has_per_pkt_xfer_complete_irq = true,
	.has_single_clk_source = true,
	.clk_divisor_hs_mode = 1,
	.clk_divisor_std_fast_mode = 0x19,
};

static int tegra_i2c_probe(struct device_d *dev)
{
	struct resource *iores;
	struct tegra_i2c_dev *i2c_dev;
	struct clk *div_clk, *fast_clk;
	void __iomem *base;
	int ret = 0;

	iores = dev_request_mem_resource(dev, 0);
	if (IS_ERR(iores)) {
		dev_err(dev, "could not get iomem region\n");
		return PTR_ERR(iores);
	}
	base = IOMEM(iores->start);

	div_clk = clk_get(dev, "div-clk");
	if (IS_ERR(div_clk)) {
		dev_err(dev, "missing controller clock");
		return PTR_ERR(div_clk);
	}

	i2c_dev = xzalloc(sizeof(*i2c_dev));

	i2c_dev->base = base;
	i2c_dev->div_clk = div_clk;
	i2c_dev->dev = dev;

	i2c_dev->rst = reset_control_get(dev, "i2c");
	if (IS_ERR(i2c_dev->rst)) {
		dev_err(dev, "missing controller reset");
		return PTR_ERR(i2c_dev->rst);
	}

	ret = of_property_read_u32(dev->device_node, "clock-frequency",
	                           &i2c_dev->bus_clk_rate);
	if (ret)
		i2c_dev->bus_clk_rate = 100000; /* default clock rate */

	i2c_dev->hw = &tegra20_i2c_hw;
	dev_get_drvdata(dev, (const void **)&i2c_dev->hw);
	i2c_dev->is_dvc = of_device_is_compatible(dev->device_node,
	                                          "nvidia,tegra20-i2c-dvc");

	if (!i2c_dev->hw->has_single_clk_source) {
		fast_clk = clk_get(dev, "fast-clk");
		if (IS_ERR(fast_clk)) {
			dev_err(dev, "missing fast clock");
			return PTR_ERR(fast_clk);
		}
		i2c_dev->fast_clk = fast_clk;
	}

	ret = tegra_i2c_init(i2c_dev);
	if (ret) {
		dev_err(dev, "Failed to initialize i2c controller");
		return ret;
	}

	i2c_dev->adapter.master_xfer = tegra_i2c_xfer;
	i2c_dev->adapter.dev.parent = dev;
	i2c_dev->adapter.nr = dev->id;
	i2c_dev->adapter.dev.device_node = dev->device_node;

	ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
	if (ret) {
		dev_err(dev, "Failed to add I2C adapter\n");
		return ret;
	}

	return 0;
}

static __maybe_unused struct of_device_id tegra_i2c_compatible[] = {
	{
		.compatible = "nvidia,tegra114-i2c",
		.data = &tegra114_i2c_hw,
	}, {
		.compatible = "nvidia,tegra30-i2c",
		.data = &tegra30_i2c_hw,
	}, {
		.compatible = "nvidia,tegra20-i2c",
		.data = &tegra20_i2c_hw,
	}, {
		.compatible = "nvidia,tegra20-i2c-dvc",
		.data = &tegra20_i2c_hw,
	}, {
		/* sentinel */
	}
};

static struct driver_d tegra_i2c_driver = {
	.name  = "tegra-i2c",
	.probe   = tegra_i2c_probe,
	.of_compatible = DRV_OF_COMPAT(tegra_i2c_compatible),
};
register_driver_macro(fs, platform, tegra_i2c_driver);