summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/net/wireless/rsi/rsi_91x_sdio.c
blob: 8428858204a6763a6d4ccfbeb6c2c81a12e7a33f (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
/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include <linux/module.h>
#include "rsi_sdio.h"
#include "rsi_common.h"

/**
 * rsi_sdio_set_cmd52_arg() - This function prepares cmd 52 read/write arg.
 * @rw: Read/write
 * @func: function number
 * @raw: indicates whether to perform read after write
 * @address: address to which to read/write
 * @writedata: data to write
 *
 * Return: argument
 */
static u32 rsi_sdio_set_cmd52_arg(bool rw,
				  u8 func,
				  u8 raw,
				  u32 address,
				  u8 writedata)
{
	return ((rw & 1) << 31) | ((func & 0x7) << 28) |
		((raw & 1) << 27) | (1 << 26) |
		((address & 0x1FFFF) << 9) | (1 << 8) |
		(writedata & 0xFF);
}

/**
 * rsi_cmd52writebyte() - This function issues cmd52 byte write onto the card.
 * @card: Pointer to the mmc_card.
 * @address: Address to write.
 * @byte: Data to write.
 *
 * Return: Write status.
 */
static int rsi_cmd52writebyte(struct mmc_card *card,
			      u32 address,
			      u8 byte)
{
	struct mmc_command io_cmd;
	u32 arg;

	memset(&io_cmd, 0, sizeof(io_cmd));
	arg = rsi_sdio_set_cmd52_arg(1, 0, 0, address, byte);
	io_cmd.opcode = SD_IO_RW_DIRECT;
	io_cmd.arg = arg;
	io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

	return mmc_wait_for_cmd(card->host, &io_cmd, 0);
}

/**
 * rsi_cmd52readbyte() - This function issues cmd52 byte read onto the card.
 * @card: Pointer to the mmc_card.
 * @address: Address to read from.
 * @byte: Variable to store read value.
 *
 * Return: Read status.
 */
static int rsi_cmd52readbyte(struct mmc_card *card,
			     u32 address,
			     u8 *byte)
{
	struct mmc_command io_cmd;
	u32 arg;
	int err;

	memset(&io_cmd, 0, sizeof(io_cmd));
	arg = rsi_sdio_set_cmd52_arg(0, 0, 0, address, 0);
	io_cmd.opcode = SD_IO_RW_DIRECT;
	io_cmd.arg = arg;
	io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &io_cmd, 0);
	if ((!err) && (byte))
		*byte =  io_cmd.resp[0] & 0xFF;
	return err;
}

/**
 * rsi_issue_sdiocommand() - This function issues sdio commands.
 * @func: Pointer to the sdio_func structure.
 * @opcode: Opcode value.
 * @arg: Arguments to pass.
 * @flags: Flags which are set.
 * @resp: Pointer to store response.
 *
 * Return: err: command status as 0 or -1.
 */
static int rsi_issue_sdiocommand(struct sdio_func *func,
				 u32 opcode,
				 u32 arg,
				 u32 flags,
				 u32 *resp)
{
	struct mmc_command cmd;
	struct mmc_host *host;
	int err;

	host = func->card->host;

	memset(&cmd, 0, sizeof(struct mmc_command));
	cmd.opcode = opcode;
	cmd.arg = arg;
	cmd.flags = flags;
	err = mmc_wait_for_cmd(host, &cmd, 3);

	if ((!err) && (resp))
		*resp = cmd.resp[0];

	return err;
}

/**
 * rsi_handle_interrupt() - This function is called upon the occurence
 *			    of an interrupt.
 * @function: Pointer to the sdio_func structure.
 *
 * Return: None.
 */
static void rsi_handle_interrupt(struct sdio_func *function)
{
	struct rsi_hw *adapter = sdio_get_drvdata(function);

	sdio_release_host(function);
	rsi_interrupt_handler(adapter);
	sdio_claim_host(function);
}

/**
 * rsi_reset_card() - This function resets and re-initializes the card.
 * @pfunction: Pointer to the sdio_func structure.
 *
 * Return: None.
 */
static void rsi_reset_card(struct sdio_func *pfunction)
{
	int ret = 0;
	int err;
	struct mmc_card *card = pfunction->card;
	struct mmc_host *host = card->host;
	s32 bit = (fls(host->ocr_avail) - 1);
	u8 cmd52_resp;
	u32 clock, resp, i;
	u16 rca;

	/* Reset 9110 chip */
	ret = rsi_cmd52writebyte(pfunction->card,
				 SDIO_CCCR_ABORT,
				 (1 << 3));

	/* Card will not send any response as it is getting reset immediately
	 * Hence expect a timeout status from host controller
	 */
	if (ret != -ETIMEDOUT)
		rsi_dbg(ERR_ZONE, "%s: Reset failed : %d\n", __func__, ret);

	/* Wait for few milli seconds to get rid of residue charges if any */
	msleep(20);

	/* Initialize the SDIO card */
	host->ios.vdd = bit;
	host->ios.chip_select = MMC_CS_DONTCARE;
	host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
	host->ios.power_mode = MMC_POWER_UP;
	host->ios.bus_width = MMC_BUS_WIDTH_1;
	host->ios.timing = MMC_TIMING_LEGACY;
	host->ops->set_ios(host, &host->ios);

	/*
	 * This delay should be sufficient to allow the power supply
	 * to reach the minimum voltage.
	 */
	msleep(20);

	host->ios.clock = host->f_min;
	host->ios.power_mode = MMC_POWER_ON;
	host->ops->set_ios(host, &host->ios);

	/*
	 * This delay must be at least 74 clock sizes, or 1 ms, or the
	 * time required to reach a stable voltage.
	 */
	msleep(20);

	/* Issue CMD0. Goto idle state */
	host->ios.chip_select = MMC_CS_HIGH;
	host->ops->set_ios(host, &host->ios);
	msleep(20);
	err = rsi_issue_sdiocommand(pfunction,
				    MMC_GO_IDLE_STATE,
				    0,
				    (MMC_RSP_NONE | MMC_CMD_BC),
				    NULL);
	host->ios.chip_select = MMC_CS_DONTCARE;
	host->ops->set_ios(host, &host->ios);
	msleep(20);
	host->use_spi_crc = 0;

	if (err)
		rsi_dbg(ERR_ZONE, "%s: CMD0 failed : %d\n", __func__, err);

	if (!host->ocr_avail) {
		/* Issue CMD5, arg = 0 */
		err = rsi_issue_sdiocommand(pfunction,
					    SD_IO_SEND_OP_COND,
					    0,
					    (MMC_RSP_R4 | MMC_CMD_BCR),
					    &resp);
		if (err)
			rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
				__func__, err);
		host->ocr_avail = resp;
	}

	/* Issue CMD5, arg = ocr. Wait till card is ready  */
	for (i = 0; i < 100; i++) {
		err = rsi_issue_sdiocommand(pfunction,
					    SD_IO_SEND_OP_COND,
					    host->ocr_avail,
					    (MMC_RSP_R4 | MMC_CMD_BCR),
					    &resp);
		if (err) {
			rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
				__func__, err);
			break;
		}

		if (resp & MMC_CARD_BUSY)
			break;
		msleep(20);
	}

	if ((i == 100) || (err)) {
		rsi_dbg(ERR_ZONE, "%s: card in not ready : %d %d\n",
			__func__, i, err);
		return;
	}

	/* Issue CMD3, get RCA */
	err = rsi_issue_sdiocommand(pfunction,
				    SD_SEND_RELATIVE_ADDR,
				    0,
				    (MMC_RSP_R6 | MMC_CMD_BCR),
				    &resp);
	if (err) {
		rsi_dbg(ERR_ZONE, "%s: CMD3 failed : %d\n", __func__, err);
		return;
	}
	rca = resp >> 16;
	host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
	host->ops->set_ios(host, &host->ios);

	/* Issue CMD7, select card  */
	err = rsi_issue_sdiocommand(pfunction,
				    MMC_SELECT_CARD,
				    (rca << 16),
				    (MMC_RSP_R1 | MMC_CMD_AC),
				    NULL);
	if (err) {
		rsi_dbg(ERR_ZONE, "%s: CMD7 failed : %d\n", __func__, err);
		return;
	}

	/* Enable high speed */
	if (card->host->caps & MMC_CAP_SD_HIGHSPEED) {
		rsi_dbg(ERR_ZONE, "%s: Set high speed mode\n", __func__);
		err = rsi_cmd52readbyte(card, SDIO_CCCR_SPEED, &cmd52_resp);
		if (err) {
			rsi_dbg(ERR_ZONE, "%s: CCCR speed reg read failed: %d\n",
				__func__, err);
		} else {
			err = rsi_cmd52writebyte(card,
						 SDIO_CCCR_SPEED,
						 (cmd52_resp | SDIO_SPEED_EHS));
			if (err) {
				rsi_dbg(ERR_ZONE,
					"%s: CCR speed regwrite failed %d\n",
					__func__, err);
				return;
			}
			host->ios.timing = MMC_TIMING_SD_HS;
			host->ops->set_ios(host, &host->ios);
		}
	}

	/* Set clock */
	if (mmc_card_hs(card))
		clock = 50000000;
	else
		clock = card->cis.max_dtr;

	if (clock > host->f_max)
		clock = host->f_max;

	host->ios.clock = clock;
	host->ops->set_ios(host, &host->ios);

	if (card->host->caps & MMC_CAP_4_BIT_DATA) {
		/* CMD52: Set bus width & disable card detect resistor */
		err = rsi_cmd52writebyte(card,
					 SDIO_CCCR_IF,
					 (SDIO_BUS_CD_DISABLE |
					  SDIO_BUS_WIDTH_4BIT));
		if (err) {
			rsi_dbg(ERR_ZONE, "%s: Set bus mode failed : %d\n",
				__func__, err);
			return;
		}
		host->ios.bus_width = MMC_BUS_WIDTH_4;
		host->ops->set_ios(host, &host->ios);
	}
}

/**
 * rsi_setclock() - This function sets the clock frequency.
 * @adapter: Pointer to the adapter structure.
 * @freq: Clock frequency.
 *
 * Return: None.
 */
static void rsi_setclock(struct rsi_hw *adapter, u32 freq)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	struct mmc_host *host = dev->pfunction->card->host;
	u32 clock;

	clock = freq * 1000;
	if (clock > host->f_max)
		clock = host->f_max;
	host->ios.clock = clock;
	host->ops->set_ios(host, &host->ios);
}

/**
 * rsi_setblocklength() - This function sets the host block length.
 * @adapter: Pointer to the adapter structure.
 * @length: Block length to be set.
 *
 * Return: status: 0 on success, -1 on failure.
 */
static int rsi_setblocklength(struct rsi_hw *adapter, u32 length)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status;
	rsi_dbg(INIT_ZONE, "%s: Setting the block length\n", __func__);

	status = sdio_set_block_size(dev->pfunction, length);
	dev->pfunction->max_blksize = 256;

	rsi_dbg(INFO_ZONE,
		"%s: Operational blk length is %d\n", __func__, length);
	return status;
}

/**
 * rsi_setupcard() - This function queries and sets the card's features.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: status: 0 on success, -1 on failure.
 */
static int rsi_setupcard(struct rsi_hw *adapter)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status = 0;

	rsi_setclock(adapter, 50000);

	dev->tx_blk_size = 256;
	status = rsi_setblocklength(adapter, dev->tx_blk_size);
	if (status)
		rsi_dbg(ERR_ZONE,
			"%s: Unable to set block length\n", __func__);
	return status;
}

/**
 * rsi_sdio_read_register() - This function reads one byte of information
 *			      from a register.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @data: Pointer to the data that stores the data read.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_read_register(struct rsi_hw *adapter,
			   u32 addr,
			   u8 *data)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 fun_num = 0;
	int status;

	sdio_claim_host(dev->pfunction);

	if (fun_num == 0)
		*data = sdio_f0_readb(dev->pfunction, addr, &status);
	else
		*data = sdio_readb(dev->pfunction, addr, &status);

	sdio_release_host(dev->pfunction);

	return status;
}

/**
 * rsi_sdio_write_register() - This function writes one byte of information
 *			       into a register.
 * @adapter: Pointer to the adapter structure.
 * @function: Function Number.
 * @addr: Address of the register.
 * @data: Pointer to the data tha has to be written.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_write_register(struct rsi_hw *adapter,
			    u8 function,
			    u32 addr,
			    u8 *data)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status = 0;

	sdio_claim_host(dev->pfunction);

	if (function == 0)
		sdio_f0_writeb(dev->pfunction, *data, addr, &status);
	else
		sdio_writeb(dev->pfunction, *data, addr, &status);

	sdio_release_host(dev->pfunction);

	return status;
}

/**
 * rsi_sdio_ack_intr() - This function acks the interrupt received.
 * @adapter: Pointer to the adapter structure.
 * @int_bit: Interrupt bit to write into register.
 *
 * Return: None.
 */
void rsi_sdio_ack_intr(struct rsi_hw *adapter, u8 int_bit)
{
	int status;
	status = rsi_sdio_write_register(adapter,
					 1,
					 (SDIO_FUN1_INTR_CLR_REG |
					  RSI_SD_REQUEST_MASTER),
					 &int_bit);
	if (status)
		rsi_dbg(ERR_ZONE, "%s: unable to send ack\n", __func__);
}



/**
 * rsi_sdio_read_register_multiple() - This function read multiple bytes of
 *				       information from the SD card.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @count: Number of multiple bytes to be read.
 * @data: Pointer to the read data.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_sdio_read_register_multiple(struct rsi_hw *adapter,
					   u32 addr,
					   u32 count,
					   u8 *data)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u32 status;

	sdio_claim_host(dev->pfunction);

	status =  sdio_readsb(dev->pfunction, data, addr, count);

	sdio_release_host(dev->pfunction);

	if (status != 0)
		rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 read failed\n", __func__);
	return status;
}

/**
 * rsi_sdio_write_register_multiple() - This function writes multiple bytes of
 *					information to the SD card.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @data: Pointer to the data that has to be written.
 * @count: Number of multiple bytes to be written.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_write_register_multiple(struct rsi_hw *adapter,
				     u32 addr,
				     u8 *data,
				     u32 count)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status;

	if (dev->write_fail > 1) {
		rsi_dbg(ERR_ZONE, "%s: Stopping card writes\n", __func__);
		return 0;
	} else if (dev->write_fail == 1) {
		/**
		 * Assuming it is a CRC failure, we want to allow another
		 *  card write
		 */
		rsi_dbg(ERR_ZONE, "%s: Continue card writes\n", __func__);
		dev->write_fail++;
	}

	sdio_claim_host(dev->pfunction);

	status = sdio_writesb(dev->pfunction, addr, data, count);

	sdio_release_host(dev->pfunction);

	if (status) {
		rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 write failed %d\n",
			__func__, status);
		dev->write_fail = 2;
	} else {
		memcpy(dev->prev_desc, data, FRAME_DESC_SZ);
	}
	return status;
}

/**
 * rsi_sdio_host_intf_write_pkt() - This function writes the packet to device.
 * @adapter: Pointer to the adapter structure.
 * @pkt: Pointer to the data to be written on to the device.
 * @len: length of the data to be written on to the device.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_sdio_host_intf_write_pkt(struct rsi_hw *adapter,
					u8 *pkt,
					u32 len)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u32 block_size = dev->tx_blk_size;
	u32 num_blocks, address, length;
	u32 queueno;
	int status;

	queueno = ((pkt[1] >> 4) & 0xf);

	num_blocks = len / block_size;

	if (len % block_size)
		num_blocks++;

	address = (num_blocks * block_size | (queueno << 12));
	length  = num_blocks * block_size;

	status = rsi_sdio_write_register_multiple(adapter,
						  address,
						  (u8 *)pkt,
						  length);
	if (status)
		rsi_dbg(ERR_ZONE, "%s: Unable to write onto the card: %d\n",
			__func__, status);
	rsi_dbg(DATA_TX_ZONE, "%s: Successfully written onto card\n", __func__);
	return status;
}

/**
 * rsi_sdio_host_intf_read_pkt() - This function reads the packet
				   from the device.
 * @adapter: Pointer to the adapter data structure.
 * @pkt: Pointer to the packet data to be read from the the device.
 * @length: Length of the data to be read from the device.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_host_intf_read_pkt(struct rsi_hw *adapter,
				u8 *pkt,
				u32 length)
{
	int status = -EINVAL;

	if (!length) {
		rsi_dbg(ERR_ZONE, "%s: Pkt size is zero\n", __func__);
		return status;
	}

	status = rsi_sdio_read_register_multiple(adapter,
						 length,
						 length, /*num of bytes*/
						 (u8 *)pkt);

	if (status)
		rsi_dbg(ERR_ZONE, "%s: Failed to read frame: %d\n", __func__,
			status);
	return status;
}

/**
 * rsi_init_sdio_interface() - This function does init specific to SDIO.
 *
 * @adapter: Pointer to the adapter data structure.
 * @pkt: Pointer to the packet data to be read from the the device.
 *
 * Return: 0 on success, -1 on failure.
 */

static int rsi_init_sdio_interface(struct rsi_hw *adapter,
				   struct sdio_func *pfunction)
{
	struct rsi_91x_sdiodev *rsi_91x_dev;
	int status = -ENOMEM;

	rsi_91x_dev = kzalloc(sizeof(*rsi_91x_dev), GFP_KERNEL);
	if (!rsi_91x_dev)
		return status;

	adapter->rsi_dev = rsi_91x_dev;

	sdio_claim_host(pfunction);

	pfunction->enable_timeout = 100;
	status = sdio_enable_func(pfunction);
	if (status) {
		rsi_dbg(ERR_ZONE, "%s: Failed to enable interface\n", __func__);
		sdio_release_host(pfunction);
		return status;
	}

	rsi_dbg(INIT_ZONE, "%s: Enabled the interface\n", __func__);

	rsi_91x_dev->pfunction = pfunction;
	adapter->device = &pfunction->dev;

	sdio_set_drvdata(pfunction, adapter);

	status = rsi_setupcard(adapter);
	if (status) {
		rsi_dbg(ERR_ZONE, "%s: Failed to setup card\n", __func__);
		goto fail;
	}

	rsi_dbg(INIT_ZONE, "%s: Setup card succesfully\n", __func__);

	status = rsi_init_sdio_slave_regs(adapter);
	if (status) {
		rsi_dbg(ERR_ZONE, "%s: Failed to init slave regs\n", __func__);
		goto fail;
	}
	sdio_release_host(pfunction);

	adapter->host_intf_write_pkt = rsi_sdio_host_intf_write_pkt;
	adapter->host_intf_read_pkt = rsi_sdio_host_intf_read_pkt;
	adapter->determine_event_timeout = rsi_sdio_determine_event_timeout;
	adapter->check_hw_queue_status = rsi_sdio_read_buffer_status_register;

#ifdef CONFIG_RSI_DEBUGFS
	adapter->num_debugfs_entries = MAX_DEBUGFS_ENTRIES;
#endif
	return status;
fail:
	sdio_disable_func(pfunction);
	sdio_release_host(pfunction);
	return status;
}

/**
 * rsi_probe() - This function is called by kernel when the driver provided
 *		 Vendor and device IDs are matched. All the initialization
 *		 work is done here.
 * @pfunction: Pointer to the sdio_func structure.
 * @id: Pointer to sdio_device_id structure.
 *
 * Return: 0 on success, 1 on failure.
 */
static int rsi_probe(struct sdio_func *pfunction,
		     const struct sdio_device_id *id)
{
	struct rsi_hw *adapter;

	rsi_dbg(INIT_ZONE, "%s: Init function called\n", __func__);

	adapter = rsi_91x_init();
	if (!adapter) {
		rsi_dbg(ERR_ZONE, "%s: Failed to init os intf ops\n",
			__func__);
		return 1;
	}

	if (rsi_init_sdio_interface(adapter, pfunction)) {
		rsi_dbg(ERR_ZONE, "%s: Failed to init sdio interface\n",
			__func__);
		goto fail;
	}

	if (rsi_sdio_device_init(adapter->priv)) {
		rsi_dbg(ERR_ZONE, "%s: Failed in device init\n", __func__);
		sdio_claim_host(pfunction);
		sdio_disable_func(pfunction);
		sdio_release_host(pfunction);
		goto fail;
	}

	sdio_claim_host(pfunction);
	if (sdio_claim_irq(pfunction, rsi_handle_interrupt)) {
		rsi_dbg(ERR_ZONE, "%s: Failed to request IRQ\n", __func__);
		sdio_release_host(pfunction);
		goto fail;
	}

	sdio_release_host(pfunction);
	rsi_dbg(INIT_ZONE, "%s: Registered Interrupt handler\n", __func__);

	return 0;
fail:
	rsi_91x_deinit(adapter);
	rsi_dbg(ERR_ZONE, "%s: Failed in probe...Exiting\n", __func__);
	return 1;
}

/**
 * rsi_disconnect() - This function performs the reverse of the probe function.
 * @pfunction: Pointer to the sdio_func structure.
 *
 * Return: void.
 */
static void rsi_disconnect(struct sdio_func *pfunction)
{
	struct rsi_hw *adapter = sdio_get_drvdata(pfunction);
	struct rsi_91x_sdiodev *dev;

	if (!adapter)
		return;

	dev = (struct rsi_91x_sdiodev *)adapter->rsi_dev;

	dev->write_fail = 2;
	rsi_mac80211_detach(adapter);

	sdio_claim_host(pfunction);
	sdio_release_irq(pfunction);
	sdio_disable_func(pfunction);
	rsi_91x_deinit(adapter);
	/* Resetting to take care of the case, where-in driver is re-loaded */
	rsi_reset_card(pfunction);
	sdio_release_host(pfunction);
}

#ifdef CONFIG_PM
static int rsi_suspend(struct device *dev)
{
	/* Not yet implemented */
	return -ENOSYS;
}

static int rsi_resume(struct device *dev)
{
	/* Not yet implemented */
	return -ENOSYS;
}

static const struct dev_pm_ops rsi_pm_ops = {
	.suspend = rsi_suspend,
	.resume = rsi_resume,
};
#endif

static const struct sdio_device_id rsi_dev_table[] =  {
	{ SDIO_DEVICE(0x303, 0x100) },
	{ SDIO_DEVICE(0x041B, 0x0301) },
	{ SDIO_DEVICE(0x041B, 0x0201) },
	{ SDIO_DEVICE(0x041B, 0x9330) },
	{ /* Blank */},
};

static struct sdio_driver rsi_driver = {
	.name       = "RSI-SDIO WLAN",
	.probe      = rsi_probe,
	.remove     = rsi_disconnect,
	.id_table   = rsi_dev_table,
#ifdef CONFIG_PM
	.drv = {
		.pm = &rsi_pm_ops,
	}
#endif
};

/**
 * rsi_module_init() - This function registers the sdio module.
 * @void: Void.
 *
 * Return: 0 on success.
 */
static int rsi_module_init(void)
{
	int ret;

	ret = sdio_register_driver(&rsi_driver);
	rsi_dbg(INIT_ZONE, "%s: Registering driver\n", __func__);
	return ret;
}

/**
 * rsi_module_exit() - This function unregisters the sdio module.
 * @void: Void.
 *
 * Return: None.
 */
static void rsi_module_exit(void)
{
	sdio_unregister_driver(&rsi_driver);
	rsi_dbg(INFO_ZONE, "%s: Unregistering driver\n", __func__);
}

module_init(rsi_module_init);
module_exit(rsi_module_exit);

MODULE_AUTHOR("Redpine Signals Inc");
MODULE_DESCRIPTION("Common SDIO layer for RSI drivers");
MODULE_SUPPORTED_DEVICE("RSI-91x");
MODULE_DEVICE_TABLE(sdio, rsi_dev_table);
MODULE_FIRMWARE(FIRMWARE_RSI9113);
MODULE_VERSION("0.1");
MODULE_LICENSE("Dual BSD/GPL");