summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/i2c-xgene-slimpro.c
blob: 63cbb9c7c1b0ed9bd121c295205dd136a58f18fc (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * X-Gene SLIMpro I2C Driver
 *
 * Copyright (c) 2014, Applied Micro Circuits Corporation
 * Author: Feng Kan <fkan@apm.com>
 * Author: Hieu Le <hnle@apm.com>
 *
 * This driver provides support for X-Gene SLIMpro I2C device access
 * using the APM X-Gene SLIMpro mailbox driver.
 */
#include <acpi/pcc.h>
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/version.h>

#define MAILBOX_OP_TIMEOUT		1000	/* Operation time out in ms */
#define MAILBOX_I2C_INDEX		0
#define SLIMPRO_IIC_BUS			1	/* Use I2C bus 1 only */

#define SMBUS_CMD_LEN			1
#define BYTE_DATA			1
#define WORD_DATA			2
#define BLOCK_DATA			3

#define SLIMPRO_IIC_I2C_PROTOCOL	0
#define SLIMPRO_IIC_SMB_PROTOCOL	1

#define SLIMPRO_IIC_READ		0
#define SLIMPRO_IIC_WRITE		1

#define IIC_SMB_WITHOUT_DATA_LEN	0
#define IIC_SMB_WITH_DATA_LEN		1

#define SLIMPRO_DEBUG_MSG		0
#define SLIMPRO_MSG_TYPE_SHIFT		28
#define SLIMPRO_DBG_SUBTYPE_I2C1READ	4
#define SLIMPRO_DBGMSG_TYPE_SHIFT	24
#define SLIMPRO_DBGMSG_TYPE_MASK	0x0F000000U
#define SLIMPRO_IIC_DEV_SHIFT		23
#define SLIMPRO_IIC_DEV_MASK		0x00800000U
#define SLIMPRO_IIC_DEVID_SHIFT		13
#define SLIMPRO_IIC_DEVID_MASK		0x007FE000U
#define SLIMPRO_IIC_RW_SHIFT		12
#define SLIMPRO_IIC_RW_MASK		0x00001000U
#define SLIMPRO_IIC_PROTO_SHIFT		11
#define SLIMPRO_IIC_PROTO_MASK		0x00000800U
#define SLIMPRO_IIC_ADDRLEN_SHIFT	8
#define SLIMPRO_IIC_ADDRLEN_MASK	0x00000700U
#define SLIMPRO_IIC_DATALEN_SHIFT	0
#define SLIMPRO_IIC_DATALEN_MASK	0x000000FFU

/*
 * SLIMpro I2C message encode
 *
 * dev		- Controller number (0-based)
 * chip		- I2C chip address
 * op		- SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
 * proto	- SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
 * addrlen	- Length of the address field
 * datalen	- Length of the data field
 */
#define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
	((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
	((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
	SLIMPRO_DBGMSG_TYPE_MASK) | \
	((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
	((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
	((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
	((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
	((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
	((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))

#define SLIMPRO_MSG_TYPE(v)             (((v) & 0xF0000000) >> 28)

/*
 * Encode for upper address for block data
 */
#define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR			0x80000000
#define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a)	((u32) (((a) << 30) \
								& 0x40000000))
#define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a)		((u32) (((a) >> 12) \
								& 0x3FF00000))
#define SLIMPRO_IIC_ENCODE_ADDR(a)			((a) & 0x000FFFFF)

#define SLIMPRO_IIC_MSG_DWORD_COUNT			3

/* PCC related defines */
#define PCC_SIGNATURE			0x50424300
#define PCC_STS_CMD_COMPLETE		BIT(0)
#define PCC_STS_SCI_DOORBELL		BIT(1)
#define PCC_STS_ERR			BIT(2)
#define PCC_STS_PLAT_NOTIFY		BIT(3)
#define PCC_CMD_GENERATE_DB_INT		BIT(15)

struct slimpro_i2c_dev {
	struct i2c_adapter adapter;
	struct device *dev;
	struct mbox_chan *mbox_chan;
	struct mbox_client mbox_client;
	int mbox_idx;
	struct completion rd_complete;
	u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
	u32 *resp_msg;
	phys_addr_t comm_base_addr;
	void *pcc_comm_addr;
};

#define to_slimpro_i2c_dev(cl)	\
		container_of(cl, struct slimpro_i2c_dev, mbox_client)

enum slimpro_i2c_version {
	XGENE_SLIMPRO_I2C_V1 = 0,
	XGENE_SLIMPRO_I2C_V2 = 1,
};

/*
 * This function tests and clears a bitmask then returns its old value
 */
static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
{
	u16 ret, val;

	val = le16_to_cpu(READ_ONCE(*addr));
	ret = val & mask;
	val &= ~mask;
	WRITE_ONCE(*addr, cpu_to_le16(val));

	return ret;
}

static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
{
	struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);

	/*
	 * Response message format:
	 * mssg[0] is the return code of the operation
	 * mssg[1] is the first data word
	 * mssg[2] is NOT used
	 */
	if (ctx->resp_msg)
		*ctx->resp_msg = ((u32 *)mssg)[1];

	if (ctx->mbox_client.tx_block)
		complete(&ctx->rd_complete);
}

static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
{
	struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
	struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;

	/* Check if platform sends interrupt */
	if (!xgene_word_tst_and_clr(&generic_comm_base->status,
				    PCC_STS_SCI_DOORBELL))
		return;

	if (xgene_word_tst_and_clr(&generic_comm_base->status,
				   PCC_STS_CMD_COMPLETE)) {
		msg = generic_comm_base + 1;

		/* Response message msg[1] contains the return value. */
		if (ctx->resp_msg)
			*ctx->resp_msg = ((u32 *)msg)[1];

		complete(&ctx->rd_complete);
	}
}

static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
{
	struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
	u32 *ptr = (void *)(generic_comm_base + 1);
	u16 status;
	int i;

	WRITE_ONCE(generic_comm_base->signature,
		   cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));

	WRITE_ONCE(generic_comm_base->command,
		   cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INT));

	status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
	status &= ~PCC_STS_CMD_COMPLETE;
	WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));

	/* Copy the message to the PCC comm space */
	for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
		WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
}

static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
{
	if (ctx->mbox_client.tx_block || !acpi_disabled) {
		if (!wait_for_completion_timeout(&ctx->rd_complete,
						 msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
			return -ETIMEDOUT;
	}

	/* Check of invalid data or no device */
	if (*ctx->resp_msg == 0xffffffff)
		return -ENODEV;

	return 0;
}

static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
				u32 *msg,
				u32 *data)
{
	int rc;

	ctx->resp_msg = data;

	if (!acpi_disabled) {
		reinit_completion(&ctx->rd_complete);
		slimpro_i2c_pcc_tx_prepare(ctx, msg);
	}

	rc = mbox_send_message(ctx->mbox_chan, msg);
	if (rc < 0)
		goto err;

	rc = start_i2c_msg_xfer(ctx);

err:
	if (!acpi_disabled)
		mbox_chan_txdone(ctx->mbox_chan, 0);

	ctx->resp_msg = NULL;

	return rc;
}

static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
			  u32 addr, u32 addrlen, u32 protocol,
			  u32 readlen, u32 *data)
{
	u32 msg[3];

	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
					SLIMPRO_IIC_READ, protocol, addrlen, readlen);
	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
	msg[2] = 0;

	return slimpro_i2c_send_msg(ctx, msg, data);
}

static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
			  u32 addr, u32 addrlen, u32 protocol, u32 writelen,
			  u32 data)
{
	u32 msg[3];

	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
					SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
	msg[2] = data;

	return slimpro_i2c_send_msg(ctx, msg, msg);
}

static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
			     u32 addrlen, u32 protocol, u32 readlen,
			     u32 with_data_len, void *data)
{
	dma_addr_t paddr;
	u32 msg[3];
	int rc;

	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
	if (dma_mapping_error(ctx->dev, paddr)) {
		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
			ctx->dma_buffer);
		return -ENOMEM;
	}

	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
					protocol, addrlen, readlen);
	msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
		 SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
		 SLIMPRO_IIC_ENCODE_ADDR(addr);
	msg[2] = (u32)paddr;

	rc = slimpro_i2c_send_msg(ctx, msg, msg);

	/* Copy to destination */
	memcpy(data, ctx->dma_buffer, readlen);

	dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
	return rc;
}

static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
			     u32 addr, u32 addrlen, u32 protocol, u32 writelen,
			     void *data)
{
	dma_addr_t paddr;
	u32 msg[3];
	int rc;

	memcpy(ctx->dma_buffer, data, writelen);
	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
			       DMA_TO_DEVICE);
	if (dma_mapping_error(ctx->dev, paddr)) {
		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
			ctx->dma_buffer);
		return -ENOMEM;
	}

	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
					protocol, addrlen, writelen);
	msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
		 SLIMPRO_IIC_ENCODE_ADDR(addr);
	msg[2] = (u32)paddr;

	if (ctx->mbox_client.tx_block)
		reinit_completion(&ctx->rd_complete);

	rc = slimpro_i2c_send_msg(ctx, msg, msg);

	dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
	return rc;
}

static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
				  unsigned short flags, char read_write,
				  u8 command, int size,
				  union i2c_smbus_data *data)
{
	struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
	int ret = -EOPNOTSUPP;
	u32 val;

	switch (size) {
	case I2C_SMBUS_BYTE:
		if (read_write == I2C_SMBUS_READ) {
			ret = slimpro_i2c_rd(ctx, addr, 0, 0,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     BYTE_DATA, &val);
			data->byte = val;
		} else {
			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     0, 0);
		}
		break;
	case I2C_SMBUS_BYTE_DATA:
		if (read_write == I2C_SMBUS_READ) {
			ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     BYTE_DATA, &val);
			data->byte = val;
		} else {
			val = data->byte;
			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     BYTE_DATA, val);
		}
		break;
	case I2C_SMBUS_WORD_DATA:
		if (read_write == I2C_SMBUS_READ) {
			ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     WORD_DATA, &val);
			data->word = val;
		} else {
			val = data->word;
			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
					     SLIMPRO_IIC_SMB_PROTOCOL,
					     WORD_DATA, val);
		}
		break;
	case I2C_SMBUS_BLOCK_DATA:
		if (read_write == I2C_SMBUS_READ) {
			ret = slimpro_i2c_blkrd(ctx, addr, command,
						SMBUS_CMD_LEN,
						SLIMPRO_IIC_SMB_PROTOCOL,
						I2C_SMBUS_BLOCK_MAX + 1,
						IIC_SMB_WITH_DATA_LEN,
						&data->block[0]);

		} else {
			ret = slimpro_i2c_blkwr(ctx, addr, command,
						SMBUS_CMD_LEN,
						SLIMPRO_IIC_SMB_PROTOCOL,
						data->block[0] + 1,
						&data->block[0]);
		}
		break;
	case I2C_SMBUS_I2C_BLOCK_DATA:
		if (read_write == I2C_SMBUS_READ) {
			ret = slimpro_i2c_blkrd(ctx, addr,
						command,
						SMBUS_CMD_LEN,
						SLIMPRO_IIC_I2C_PROTOCOL,
						I2C_SMBUS_BLOCK_MAX,
						IIC_SMB_WITHOUT_DATA_LEN,
						&data->block[1]);
		} else {
			ret = slimpro_i2c_blkwr(ctx, addr, command,
						SMBUS_CMD_LEN,
						SLIMPRO_IIC_I2C_PROTOCOL,
						data->block[0],
						&data->block[1]);
		}
		break;
	default:
		break;
	}
	return ret;
}

/*
* Return list of supported functionality.
*/
static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_BLOCK_DATA |
		I2C_FUNC_SMBUS_I2C_BLOCK;
}

static const struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
	.smbus_xfer = xgene_slimpro_i2c_xfer,
	.functionality = xgene_slimpro_i2c_func,
};

static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
{
	struct slimpro_i2c_dev *ctx;
	struct i2c_adapter *adapter;
	struct mbox_client *cl;
	int rc;

	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->dev = &pdev->dev;
	platform_set_drvdata(pdev, ctx);
	cl = &ctx->mbox_client;

	/* Request mailbox channel */
	cl->dev = &pdev->dev;
	init_completion(&ctx->rd_complete);
	cl->tx_tout = MAILBOX_OP_TIMEOUT;
	cl->knows_txdone = false;
	if (acpi_disabled) {
		cl->tx_block = true;
		cl->rx_callback = slimpro_i2c_rx_cb;
		ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
		if (IS_ERR(ctx->mbox_chan)) {
			dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
			return PTR_ERR(ctx->mbox_chan);
		}
	} else {
		struct acpi_pcct_hw_reduced *cppc_ss;
		const struct acpi_device_id *acpi_id;
		int version = XGENE_SLIMPRO_I2C_V1;

		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
					    &pdev->dev);
		if (!acpi_id)
			return -EINVAL;

		version = (int)acpi_id->driver_data;

		if (device_property_read_u32(&pdev->dev, "pcc-channel",
					     &ctx->mbox_idx))
			ctx->mbox_idx = MAILBOX_I2C_INDEX;

		cl->tx_block = false;
		cl->rx_callback = slimpro_i2c_pcc_rx_cb;
		ctx->mbox_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
		if (IS_ERR(ctx->mbox_chan)) {
			dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
			return PTR_ERR(ctx->mbox_chan);
		}

		/*
		 * The PCC mailbox controller driver should
		 * have parsed the PCCT (global table of all
		 * PCC channels) and stored pointers to the
		 * subspace communication region in con_priv.
		 */
		cppc_ss = ctx->mbox_chan->con_priv;
		if (!cppc_ss) {
			dev_err(&pdev->dev, "PPC subspace not found\n");
			rc = -ENOENT;
			goto mbox_err;
		}

		if (!ctx->mbox_chan->mbox->txdone_irq) {
			dev_err(&pdev->dev, "PCC IRQ not supported\n");
			rc = -ENOENT;
			goto mbox_err;
		}

		/*
		 * This is the shared communication region
		 * for the OS and Platform to communicate over.
		 */
		ctx->comm_base_addr = cppc_ss->base_address;
		if (ctx->comm_base_addr) {
			if (version == XGENE_SLIMPRO_I2C_V2)
				ctx->pcc_comm_addr = memremap(
							ctx->comm_base_addr,
							cppc_ss->length,
							MEMREMAP_WT);
			else
				ctx->pcc_comm_addr = memremap(
							ctx->comm_base_addr,
							cppc_ss->length,
							MEMREMAP_WB);
		} else {
			dev_err(&pdev->dev, "Failed to get PCC comm region\n");
			rc = -ENOENT;
			goto mbox_err;
		}

		if (!ctx->pcc_comm_addr) {
			dev_err(&pdev->dev,
				"Failed to ioremap PCC comm region\n");
			rc = -ENOMEM;
			goto mbox_err;
		}
	}
	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
	if (rc)
		dev_warn(&pdev->dev, "Unable to set dma mask\n");

	/* Setup I2C adapter */
	adapter = &ctx->adapter;
	snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
	adapter->algo = &xgene_slimpro_i2c_algorithm;
	adapter->class = I2C_CLASS_HWMON;
	adapter->dev.parent = &pdev->dev;
	adapter->dev.of_node = pdev->dev.of_node;
	ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
	i2c_set_adapdata(adapter, ctx);
	rc = i2c_add_adapter(adapter);
	if (rc)
		goto mbox_err;

	dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
	return 0;

mbox_err:
	if (acpi_disabled)
		mbox_free_channel(ctx->mbox_chan);
	else
		pcc_mbox_free_channel(ctx->mbox_chan);

	return rc;
}

static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
{
	struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);

	i2c_del_adapter(&ctx->adapter);

	if (acpi_disabled)
		mbox_free_channel(ctx->mbox_chan);
	else
		pcc_mbox_free_channel(ctx->mbox_chan);

	return 0;
}

static const struct of_device_id xgene_slimpro_i2c_dt_ids[] = {
	{.compatible = "apm,xgene-slimpro-i2c" },
	{},
};
MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);

#ifdef CONFIG_ACPI
static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
	{"APMC0D40", XGENE_SLIMPRO_I2C_V1},
	{"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
	{}
};
MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
#endif

static struct platform_driver xgene_slimpro_i2c_driver = {
	.probe	= xgene_slimpro_i2c_probe,
	.remove	= xgene_slimpro_i2c_remove,
	.driver	= {
		.name	= "xgene-slimpro-i2c",
		.of_match_table = of_match_ptr(xgene_slimpro_i2c_dt_ids),
		.acpi_match_table = ACPI_PTR(xgene_slimpro_i2c_acpi_ids)
	},
};

module_platform_driver(xgene_slimpro_i2c_driver);

MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
MODULE_AUTHOR("Feng Kan <fkan@apm.com>");
MODULE_AUTHOR("Hieu Le <hnle@apm.com>");
MODULE_LICENSE("GPL");