aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/libertas/if_cs.c
blob: 2c6f28ac519705ad547058b674a173ed71111374 (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
/*

  Driver for the Marvell 8385 based compact flash WLAN cards.

  (C) 2007 by Holger Schurig <hs4233@mail.mn-solutions.de>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  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.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>

#include <linux/io.h>

#define DRV_NAME "libertas_cs"

#include "decl.h"
#include "defs.h"
#include "dev.h"


/********************************************************************/
/* Module stuff                                                     */
/********************************************************************/

MODULE_AUTHOR("Holger Schurig <hs4233@mail.mn-solutions.de>");
MODULE_DESCRIPTION("Driver for Marvell 83xx compact flash WLAN cards");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("libertas_cs_helper.fw");



/********************************************************************/
/* Data structures                                                  */
/********************************************************************/

struct if_cs_card {
	struct pcmcia_device *p_dev;
	struct lbs_private *priv;
	void __iomem *iobase;
	bool align_regs;
};



/********************************************************************/
/* Hardware access                                                  */
/********************************************************************/

/* This define enables wrapper functions which allow you
   to dump all register accesses. You normally won't this,
   except for development */
/* #define DEBUG_IO */

#ifdef DEBUG_IO
static int debug_output = 0;
#else
/* This way the compiler optimizes the printk's away */
#define debug_output 0
#endif

static inline unsigned int if_cs_read8(struct if_cs_card *card, uint reg)
{
	unsigned int val = ioread8(card->iobase + reg);
	if (debug_output)
		printk(KERN_INFO "inb %08x<%02x\n", reg, val);
	return val;
}
static inline unsigned int if_cs_read16(struct if_cs_card *card, uint reg)
{
	unsigned int val = ioread16(card->iobase + reg);
	if (debug_output)
		printk(KERN_INFO "inw %08x<%04x\n", reg, val);
	return val;
}
static inline void if_cs_read16_rep(
	struct if_cs_card *card,
	uint reg,
	void *buf,
	unsigned long count)
{
	if (debug_output)
		printk(KERN_INFO "insw %08x<(0x%lx words)\n",
			reg, count);
	ioread16_rep(card->iobase + reg, buf, count);
}

static inline void if_cs_write8(struct if_cs_card *card, uint reg, u8 val)
{
	if (debug_output)
		printk(KERN_INFO "outb %08x>%02x\n", reg, val);
	iowrite8(val, card->iobase + reg);
}

static inline void if_cs_write16(struct if_cs_card *card, uint reg, u16 val)
{
	if (debug_output)
		printk(KERN_INFO "outw %08x>%04x\n", reg, val);
	iowrite16(val, card->iobase + reg);
}

static inline void if_cs_write16_rep(
	struct if_cs_card *card,
	uint reg,
	const void *buf,
	unsigned long count)
{
	if (debug_output)
		printk(KERN_INFO "outsw %08x>(0x%lx words)\n",
			reg, count);
	iowrite16_rep(card->iobase + reg, buf, count);
}


/*
 * I know that polling/delaying is frowned upon. However, this procedure
 * with polling is needed while downloading the firmware. At this stage,
 * the hardware does unfortunately not create any interrupts.
 *
 * Fortunately, this function is never used once the firmware is in
 * the card. :-)
 *
 * As a reference, see the "Firmware Specification v5.1", page 18
 * and 19. I did not follow their suggested timing to the word,
 * but this works nice & fast anyway.
 */
static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 reg)
{
	int i;

	for (i = 0; i < 100000; i++) {
		u8 val = if_cs_read8(card, addr);
		if (val == reg)
			return 0;
		udelay(5);
	}
	return -ETIME;
}



/*
 * First the bitmasks for the host/card interrupt/status registers:
 */
#define IF_CS_BIT_TX			0x0001
#define IF_CS_BIT_RX			0x0002
#define IF_CS_BIT_COMMAND		0x0004
#define IF_CS_BIT_RESP			0x0008
#define IF_CS_BIT_EVENT			0x0010
#define	IF_CS_BIT_MASK			0x001f



/*
 * It's not really clear to me what the host status register is for. It
 * needs to be set almost in union with "host int cause". The following
 * bits from above are used:
 *
 *   IF_CS_BIT_TX         driver downloaded a data packet
 *   IF_CS_BIT_RX         driver got a data packet
 *   IF_CS_BIT_COMMAND    driver downloaded a command
 *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 *   IF_CS_BIT_EVENT      driver read a host event
 */
#define IF_CS_HOST_STATUS		0x00000000

/*
 * With the host int cause register can the host (that is, Linux) cause
 * an interrupt in the firmware, to tell the firmware about those events:
 *
 *   IF_CS_BIT_TX         a data packet has been downloaded
 *   IF_CS_BIT_RX         a received data packet has retrieved
 *   IF_CS_BIT_COMMAND    a firmware block or a command has been downloaded
 *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 *   IF_CS_BIT_EVENT      a host event (link lost etc) has been retrieved
 */
#define IF_CS_HOST_INT_CAUSE		0x00000002

/*
 * The host int mask register is used to enable/disable interrupt.  However,
 * I have the suspicion that disabled interrupts are lost.
 */
#define IF_CS_HOST_INT_MASK		0x00000004

/*
 * Used to send or receive data packets:
 */
#define IF_CS_WRITE			0x00000016
#define IF_CS_WRITE_LEN			0x00000014
#define IF_CS_READ			0x00000010
#define IF_CS_READ_LEN			0x00000024

/*
 * Used to send commands (and to send firmware block) and to
 * receive command responses:
 */
#define IF_CS_CMD			0x0000001A
#define IF_CS_CMD_LEN			0x00000018
#define IF_CS_RESP			0x00000012
#define IF_CS_RESP_LEN			0x00000030

/*
 * The card status registers shows what the card/firmware actually
 * accepts:
 *
 *   IF_CS_BIT_TX        you may send a data packet
 *   IF_CS_BIT_RX        you may retrieve a data packet
 *   IF_CS_BIT_COMMAND   you may send a command
 *   IF_CS_BIT_RESP      you may retrieve a command response
 *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 *
 * When reading this register several times, you will get back the same
 * results --- with one exception: the IF_CS_BIT_EVENT clear itself
 * automatically.
 *
 * Not that we don't rely on BIT_RX,_BIT_RESP or BIT_EVENT because
 * we handle this via the card int cause register.
 */
#define IF_CS_CARD_STATUS		0x00000020
#define IF_CS_CARD_STATUS_MASK		0x7f00

/*
 * The card int cause register is used by the card/firmware to notify us
 * about the following events:
 *
 *   IF_CS_BIT_TX        a data packet has successfully been sentx
 *   IF_CS_BIT_RX        a data packet has been received and can be retrieved
 *   IF_CS_BIT_COMMAND   not used
 *   IF_CS_BIT_RESP      the firmware has a command response for us
 *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 */
#define IF_CS_CARD_INT_CAUSE		0x00000022

/*
 * This is used to for handshaking with the card's bootloader/helper image
 * to synchronize downloading of firmware blocks.
 */
#define IF_CS_SQ_READ_LOW		0x00000028
#define IF_CS_SQ_HELPER_OK		0x10

/*
 * The scratch register tells us ...
 *
 * IF_CS_SCRATCH_BOOT_OK     the bootloader runs
 * IF_CS_SCRATCH_HELPER_OK   the helper firmware already runs
 */
#define IF_CS_SCRATCH			0x0000003F
#define IF_CS_SCRATCH_BOOT_OK		0x00
#define IF_CS_SCRATCH_HELPER_OK		0x5a

/*
 * Used to detect ancient chips:
 */
#define IF_CS_PRODUCT_ID		0x0000001C
#define IF_CS_CF8385_B1_REV		0x12
#define IF_CS_CF8381_B3_REV		0x04
#define IF_CS_CF8305_B1_REV		0x03

/*
 * Used to detect other cards than CF8385 since their revisions of silicon
 * doesn't match those from CF8385, eg. CF8381 B3 works with this driver.
 */
#define CF8305_MANFID		0x02db
#define CF8305_CARDID		0x8103
#define CF8381_MANFID		0x02db
#define CF8381_CARDID		0x6064
#define CF8385_MANFID		0x02df
#define CF8385_CARDID		0x8103

static inline int if_cs_hw_is_cf8305(struct pcmcia_device *p_dev)
{
	return (p_dev->manf_id == CF8305_MANFID &&
		p_dev->card_id == CF8305_CARDID);
}

static inline int if_cs_hw_is_cf8381(struct pcmcia_device *p_dev)
{
	return (p_dev->manf_id == CF8381_MANFID &&
		p_dev->card_id == CF8381_CARDID);
}

static inline int if_cs_hw_is_cf8385(struct pcmcia_device *p_dev)
{
	return (p_dev->manf_id == CF8385_MANFID &&
		p_dev->card_id == CF8385_CARDID);
}

/********************************************************************/
/* I/O and interrupt handling                                       */
/********************************************************************/

static inline void if_cs_enable_ints(struct if_cs_card *card)
{
	lbs_deb_enter(LBS_DEB_CS);
	if_cs_write16(card, IF_CS_HOST_INT_MASK, 0);
}

static inline void if_cs_disable_ints(struct if_cs_card *card)
{
	lbs_deb_enter(LBS_DEB_CS);
	if_cs_write16(card, IF_CS_HOST_INT_MASK, IF_CS_BIT_MASK);
}

/*
 * Called from if_cs_host_to_card to send a command to the hardware
 */
static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb)
{
	struct if_cs_card *card = (struct if_cs_card *)priv->card;
	int ret = -1;
	int loops = 0;

	lbs_deb_enter(LBS_DEB_CS);
	if_cs_disable_ints(card);

	/* Is hardware ready? */
	while (1) {
		u16 status = if_cs_read16(card, IF_CS_CARD_STATUS);
		if (status & IF_CS_BIT_COMMAND)
			break;
		if (++loops > 100) {
			lbs_pr_err("card not ready for commands\n");
			goto done;
		}
		mdelay(1);
	}

	if_cs_write16(card, IF_CS_CMD_LEN, nb);

	if_cs_write16_rep(card, IF_CS_CMD, buf, nb / 2);
	/* Are we supposed to transfer an odd amount of bytes? */
	if (nb & 1)
		if_cs_write8(card, IF_CS_CMD, buf[nb-1]);

	/* "Assert the download over interrupt command in the Host
	 * status register" */
	if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);

	/* "Assert the download over interrupt command in the Card
	 * interrupt case register" */
	if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
	ret = 0;

done:
	if_cs_enable_ints(card);
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}

/*
 * Called from if_cs_host_to_card to send a data to the hardware
 */
static void if_cs_send_data(struct lbs_private *priv, u8 *buf, u16 nb)
{
	struct if_cs_card *card = (struct if_cs_card *)priv->card;
	u16 status;

	lbs_deb_enter(LBS_DEB_CS);
	if_cs_disable_ints(card);

	status = if_cs_read16(card, IF_CS_CARD_STATUS);
	BUG_ON((status & IF_CS_BIT_TX) == 0);

	if_cs_write16(card, IF_CS_WRITE_LEN, nb);

	/* write even number of bytes, then odd byte if necessary */
	if_cs_write16_rep(card, IF_CS_WRITE, buf, nb / 2);
	if (nb & 1)
		if_cs_write8(card, IF_CS_WRITE, buf[nb-1]);

	if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_TX);
	if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_TX);
	if_cs_enable_ints(card);

	lbs_deb_leave(LBS_DEB_CS);
}

/*
 * Get the command result out of the card.
 */
static int if_cs_receive_cmdres(struct lbs_private *priv, u8 *data, u32 *len)
{
	unsigned long flags;
	int ret = -1;
	u16 status;

	lbs_deb_enter(LBS_DEB_CS);

	/* is hardware ready? */
	status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
	if ((status & IF_CS_BIT_RESP) == 0) {
		lbs_pr_err("no cmd response in card\n");
		*len = 0;
		goto out;
	}

	*len = if_cs_read16(priv->card, IF_CS_RESP_LEN);
	if ((*len == 0) || (*len > LBS_CMD_BUFFER_SIZE)) {
		lbs_pr_err("card cmd buffer has invalid # of bytes (%d)\n", *len);
		goto out;
	}

	/* read even number of bytes, then odd byte if necessary */
	if_cs_read16_rep(priv->card, IF_CS_RESP, data, *len/sizeof(u16));
	if (*len & 1)
		data[*len-1] = if_cs_read8(priv->card, IF_CS_RESP);

	/* This is a workaround for a firmware that reports too much
	 * bytes */
	*len -= 8;
	ret = 0;

	/* Clear this flag again */
	spin_lock_irqsave(&priv->driver_lock, flags);
	priv->dnld_sent = DNLD_RES_RECEIVED;
	spin_unlock_irqrestore(&priv->driver_lock, flags);

out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d, len %d", ret, *len);
	return ret;
}

static struct sk_buff *if_cs_receive_data(struct lbs_private *priv)
{
	struct sk_buff *skb = NULL;
	u16 len;
	u8 *data;

	lbs_deb_enter(LBS_DEB_CS);

	len = if_cs_read16(priv->card, IF_CS_READ_LEN);
	if (len == 0 || len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
		lbs_pr_err("card data buffer has invalid # of bytes (%d)\n", len);
		priv->dev->stats.rx_dropped++;
		goto dat_err;
	}

	skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + 2);
	if (!skb)
		goto out;
	skb_put(skb, len);
	skb_reserve(skb, 2);/* 16 byte align */
	data = skb->data;

	/* read even number of bytes, then odd byte if necessary */
	if_cs_read16_rep(priv->card, IF_CS_READ, data, len/sizeof(u16));
	if (len & 1)
		data[len-1] = if_cs_read8(priv->card, IF_CS_READ);

dat_err:
	if_cs_write16(priv->card, IF_CS_HOST_STATUS, IF_CS_BIT_RX);
	if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_RX);

out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %p", skb);
	return skb;
}

static irqreturn_t if_cs_interrupt(int irq, void *data)
{
	struct if_cs_card *card = data;
	struct lbs_private *priv = card->priv;
	u16 cause;

	lbs_deb_enter(LBS_DEB_CS);

	/* Ask card interrupt cause register if there is something for us */
	cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE);
	lbs_deb_cs("cause 0x%04x\n", cause);

	if (cause == 0) {
		/* Not for us */
		return IRQ_NONE;
	}

	if (cause == 0xffff) {
		/* Read in junk, the card has probably been removed */
		card->priv->surpriseremoved = 1;
		return IRQ_HANDLED;
	}

	if (cause & IF_CS_BIT_RX) {
		struct sk_buff *skb;
		lbs_deb_cs("rx packet\n");
		skb = if_cs_receive_data(priv);
		if (skb)
			lbs_process_rxed_packet(priv, skb);
	}

	if (cause & IF_CS_BIT_TX) {
		lbs_deb_cs("tx done\n");
		lbs_host_to_card_done(priv);
	}

	if (cause & IF_CS_BIT_RESP) {
		unsigned long flags;
		u8 i;

		lbs_deb_cs("cmd resp\n");
		spin_lock_irqsave(&priv->driver_lock, flags);
		i = (priv->resp_idx == 0) ? 1 : 0;
		spin_unlock_irqrestore(&priv->driver_lock, flags);

		BUG_ON(priv->resp_len[i]);
		if_cs_receive_cmdres(priv, priv->resp_buf[i],
			&priv->resp_len[i]);

		spin_lock_irqsave(&priv->driver_lock, flags);
		lbs_notify_command_response(priv, i);
		spin_unlock_irqrestore(&priv->driver_lock, flags);
	}

	if (cause & IF_CS_BIT_EVENT) {
		u16 status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
		if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE,
			IF_CS_BIT_EVENT);
		lbs_queue_event(priv, (status & IF_CS_CARD_STATUS_MASK) >> 8);
	}

	/* Clear interrupt cause */
	if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK);

	lbs_deb_leave(LBS_DEB_CS);
	return IRQ_HANDLED;
}




/********************************************************************/
/* Firmware                                                         */
/********************************************************************/

/*
 * Tries to program the helper firmware.
 *
 * Return 0 on success
 */
static int if_cs_prog_helper(struct if_cs_card *card)
{
	int ret = 0;
	int sent = 0;
	u8  scratch;
	const struct firmware *fw;

	lbs_deb_enter(LBS_DEB_CS);

	/*
	 * This is the only place where an unaligned register access happens on
	 * the CF8305 card, therefore for the sake of speed of the driver, we do
	 * the alignment correction here.
	 */
	if (card->align_regs)
		scratch = if_cs_read16(card, IF_CS_SCRATCH) >> 8;
	else
		scratch = if_cs_read8(card, IF_CS_SCRATCH);

	/* "If the value is 0x5a, the firmware is already
	 * downloaded successfully"
	 */
	if (scratch == IF_CS_SCRATCH_HELPER_OK)
		goto done;

	/* "If the value is != 00, it is invalid value of register */
	if (scratch != IF_CS_SCRATCH_BOOT_OK) {
		ret = -ENODEV;
		goto done;
	}

	/* TODO: make firmware file configurable */
	ret = request_firmware(&fw, "libertas_cs_helper.fw",
		&card->p_dev->dev);
	if (ret) {
		lbs_pr_err("can't load helper firmware\n");
		ret = -ENODEV;
		goto done;
	}
	lbs_deb_cs("helper size %td\n", fw->size);

	/* "Set the 5 bytes of the helper image to 0" */
	/* Not needed, this contains an ARM branch instruction */

	for (;;) {
		/* "the number of bytes to send is 256" */
		int count = 256;
		int remain = fw->size - sent;

		if (remain < count)
			count = remain;

		/* "write the number of bytes to be sent to the I/O Command
		 * write length register" */
		if_cs_write16(card, IF_CS_CMD_LEN, count);

		/* "write this to I/O Command port register as 16 bit writes */
		if (count)
			if_cs_write16_rep(card, IF_CS_CMD,
				&fw->data[sent],
				count >> 1);

		/* "Assert the download over interrupt command in the Host
		 * status register" */
		if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);

		/* "Assert the download over interrupt command in the Card
		 * interrupt case register" */
		if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);

		/* "The host polls the Card Status register ... for 50 ms before
		   declaring a failure */
		ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
			IF_CS_BIT_COMMAND);
		if (ret < 0) {
			lbs_pr_err("can't download helper at 0x%x, ret %d\n",
				sent, ret);
			goto err_release;
		}

		if (count == 0)
			break;

		sent += count;
	}

err_release:
	release_firmware(fw);
done:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


static int if_cs_prog_real(struct if_cs_card *card)
{
	const struct firmware *fw;
	int ret = 0;
	int retry = 0;
	int len = 0;
	int sent;

	lbs_deb_enter(LBS_DEB_CS);

	/* TODO: make firmware file configurable */
	ret = request_firmware(&fw, "libertas_cs.fw",
		&card->p_dev->dev);
	if (ret) {
		lbs_pr_err("can't load firmware\n");
		ret = -ENODEV;
		goto done;
	}
	lbs_deb_cs("fw size %td\n", fw->size);

	ret = if_cs_poll_while_fw_download(card, IF_CS_SQ_READ_LOW,
		IF_CS_SQ_HELPER_OK);
	if (ret < 0) {
		lbs_pr_err("helper firmware doesn't answer\n");
		goto err_release;
	}

	for (sent = 0; sent < fw->size; sent += len) {
		len = if_cs_read16(card, IF_CS_SQ_READ_LOW);
		if (len & 1) {
			retry++;
			lbs_pr_info("odd, need to retry this firmware block\n");
		} else {
			retry = 0;
		}

		if (retry > 20) {
			lbs_pr_err("could not download firmware\n");
			ret = -ENODEV;
			goto err_release;
		}
		if (retry) {
			sent -= len;
		}


		if_cs_write16(card, IF_CS_CMD_LEN, len);

		if_cs_write16_rep(card, IF_CS_CMD,
			&fw->data[sent],
			(len+1) >> 1);
		if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
		if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);

		ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
			IF_CS_BIT_COMMAND);
		if (ret < 0) {
			lbs_pr_err("can't download firmware at 0x%x\n", sent);
			goto err_release;
		}
	}

	ret = if_cs_poll_while_fw_download(card, IF_CS_SCRATCH, 0x5a);
	if (ret < 0)
		lbs_pr_err("firmware download failed\n");

err_release:
	release_firmware(fw);

done:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}



/********************************************************************/
/* Callback functions for libertas.ko                               */
/********************************************************************/

/* Send commands or data packets to the card */
static int if_cs_host_to_card(struct lbs_private *priv,
	u8 type,
	u8 *buf,
	u16 nb)
{
	int ret = -1;

	lbs_deb_enter_args(LBS_DEB_CS, "type %d, bytes %d", type, nb);

	switch (type) {
	case MVMS_DAT:
		priv->dnld_sent = DNLD_DATA_SENT;
		if_cs_send_data(priv, buf, nb);
		ret = 0;
		break;
	case MVMS_CMD:
		priv->dnld_sent = DNLD_CMD_SENT;
		ret = if_cs_send_cmd(priv, buf, nb);
		break;
	default:
		lbs_pr_err("%s: unsupported type %d\n", __func__, type);
	}

	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


/********************************************************************/
/* Card Services                                                    */
/********************************************************************/

/*
 * After a card is removed, if_cs_release() will unregister the
 * device, and release the PCMCIA configuration.  If the device is
 * still open, this will be postponed until it is closed.
 */
static void if_cs_release(struct pcmcia_device *p_dev)
{
	struct if_cs_card *card = p_dev->priv;

	lbs_deb_enter(LBS_DEB_CS);

	free_irq(p_dev->irq, card);
	pcmcia_disable_device(p_dev);
	if (card->iobase)
		ioport_unmap(card->iobase);

	lbs_deb_leave(LBS_DEB_CS);
}


/*
 * This creates an "instance" of the driver, allocating local data
 * structures for one device.  The device is registered with Card
 * Services.
 *
 * The dev_link structure is initialized, but we don't actually
 * configure the card at this point -- we wait until we receive a card
 * insertion event.
 */

static int if_cs_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
{
	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;

	if (p_dev->resource[1]->end) {
		lbs_pr_err("wrong CIS (check number of IO windows)\n");
		return -ENODEV;
	}

	/* This reserves IO space but doesn't actually enable it */
	return pcmcia_request_io(p_dev);
}

static int if_cs_probe(struct pcmcia_device *p_dev)
{
	int ret = -ENOMEM;
	unsigned int prod_id;
	struct lbs_private *priv;
	struct if_cs_card *card;

	lbs_deb_enter(LBS_DEB_CS);

	card = kzalloc(sizeof(struct if_cs_card), GFP_KERNEL);
	if (!card) {
		lbs_pr_err("error in kzalloc\n");
		goto out;
	}
	card->p_dev = p_dev;
	p_dev->priv = card;

	p_dev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;

	if (pcmcia_loop_config(p_dev, if_cs_ioprobe, NULL)) {
		lbs_pr_err("error in pcmcia_loop_config\n");
		goto out1;
	}

	/*
	 * Allocate an interrupt line.  Note that this does not assign
	 * a handler to the interrupt, unless the 'Handler' member of
	 * the irq structure is initialized.
	 */
	if (!p_dev->irq)
		goto out1;

	/* Initialize io access */
	card->iobase = ioport_map(p_dev->resource[0]->start,
				resource_size(p_dev->resource[0]));
	if (!card->iobase) {
		lbs_pr_err("error in ioport_map\n");
		ret = -EIO;
		goto out1;
	}

	/*
	 * This actually configures the PCMCIA socket -- setting up
	 * the I/O windows and the interrupt mapping, and putting the
	 * card and host interface into "Memory and IO" mode.
	 */
	ret = pcmcia_enable_device(p_dev);
	if (ret) {
		lbs_pr_err("error in pcmcia_enable_device\n");
		goto out2;
	}

	/* Finally, report what we've done */
	lbs_deb_cs("irq %d, io %pR", p_dev->irq, p_dev->resource[0]);

	/*
	 * Most of the libertas cards can do unaligned register access, but some
	 * weird ones can not. That's especially true for the CF8305 card.
	 */
	card->align_regs = 0;

	/* Check if we have a current silicon */
	prod_id = if_cs_read8(card, IF_CS_PRODUCT_ID);
	if (if_cs_hw_is_cf8305(p_dev)) {
		card->align_regs = 1;
		if (prod_id < IF_CS_CF8305_B1_REV) {
			lbs_pr_err("old chips like 8305 rev B3 "
				"aren't supported\n");
			ret = -ENODEV;
			goto out2;
		}
	}

	if (if_cs_hw_is_cf8381(p_dev) && prod_id < IF_CS_CF8381_B3_REV) {
		lbs_pr_err("old chips like 8381 rev B3 aren't supported\n");
		ret = -ENODEV;
		goto out2;
	}

	if (if_cs_hw_is_cf8385(p_dev) && prod_id < IF_CS_CF8385_B1_REV) {
		lbs_pr_err("old chips like 8385 rev B1 aren't supported\n");
		ret = -ENODEV;
		goto out2;
	}

	/* Load the firmware early, before calling into libertas.ko */
	ret = if_cs_prog_helper(card);
	if (ret == 0 && !if_cs_hw_is_cf8305(p_dev))
		ret = if_cs_prog_real(card);
	if (ret)
		goto out2;

	/* Make this card known to the libertas driver */
	priv = lbs_add_card(card, &p_dev->dev);
	if (!priv) {
		ret = -ENOMEM;
		goto out2;
	}

	/* Finish setting up fields in lbs_private */
	card->priv = priv;
	priv->card = card;
	priv->hw_host_to_card = if_cs_host_to_card;
	priv->enter_deep_sleep = NULL;
	priv->exit_deep_sleep = NULL;
	priv->reset_deep_sleep_wakeup = NULL;
	priv->fw_ready = 1;

	/* Now actually get the IRQ */
	ret = request_irq(p_dev->irq, if_cs_interrupt,
		IRQF_SHARED, DRV_NAME, card);
	if (ret) {
		lbs_pr_err("error in request_irq\n");
		goto out3;
	}

	/* Clear any interrupt cause that happend while sending
	 * firmware/initializing card */
	if_cs_write16(card, IF_CS_CARD_INT_CAUSE, IF_CS_BIT_MASK);
	if_cs_enable_ints(card);

	/* And finally bring the card up */
	if (lbs_start_card(priv) != 0) {
		lbs_pr_err("could not activate card\n");
		goto out3;
	}

	ret = 0;
	goto out;

out3:
	lbs_remove_card(priv);
out2:
	ioport_unmap(card->iobase);
out1:
	pcmcia_disable_device(p_dev);
out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


/*
 * This deletes a driver "instance".  The device is de-registered with
 * Card Services.  If it has been released, all local data structures
 * are freed.  Otherwise, the structures will be freed when the device
 * is released.
 */
static void if_cs_detach(struct pcmcia_device *p_dev)
{
	struct if_cs_card *card = p_dev->priv;

	lbs_deb_enter(LBS_DEB_CS);

	lbs_stop_card(card->priv);
	lbs_remove_card(card->priv);
	if_cs_disable_ints(card);
	if_cs_release(p_dev);
	kfree(card);

	lbs_deb_leave(LBS_DEB_CS);
}



/********************************************************************/
/* Module initialization                                            */
/********************************************************************/

static struct pcmcia_device_id if_cs_ids[] = {
	PCMCIA_DEVICE_MANF_CARD(CF8305_MANFID, CF8305_CARDID),
	PCMCIA_DEVICE_MANF_CARD(CF8381_MANFID, CF8381_CARDID),
	PCMCIA_DEVICE_MANF_CARD(CF8385_MANFID, CF8385_CARDID),
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, if_cs_ids);


static struct pcmcia_driver lbs_driver = {
	.owner		= THIS_MODULE,
	.drv		= {
		.name	= DRV_NAME,
	},
	.probe		= if_cs_probe,
	.remove		= if_cs_detach,
	.id_table       = if_cs_ids,
};


static int __init if_cs_init(void)
{
	int ret;

	lbs_deb_enter(LBS_DEB_CS);
	ret = pcmcia_register_driver(&lbs_driver);
	lbs_deb_leave(LBS_DEB_CS);
	return ret;
}


static void __exit if_cs_exit(void)
{
	lbs_deb_enter(LBS_DEB_CS);
	pcmcia_unregister_driver(&lbs_driver);
	lbs_deb_leave(LBS_DEB_CS);
}


module_init(if_cs_init);
module_exit(if_cs_exit);