Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

   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
/*

  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.

*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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");



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

struct if_cs_card {
	struct pcmcia_device *p_dev;
	struct lbs_private *priv;
	void __iomem *iobase;
	bool align_regs;
	u32 model;
};


enum {
	MODEL_UNKNOWN = 0x00,
	MODEL_8305 = 0x01,
	MODEL_8381 = 0x02,
	MODEL_8385 = 0x03
};

static const struct lbs_fw_table fw_table[] = {
	{ MODEL_8305, "libertas/cf8305.bin", NULL },
	{ MODEL_8305, "libertas_cs_helper.fw", NULL },
	{ MODEL_8381, "libertas/cf8381_helper.bin", "libertas/cf8381.bin" },
	{ MODEL_8381, "libertas_cs_helper.fw", "libertas_cs.fw" },
	{ MODEL_8385, "libertas/cf8385_helper.bin", "libertas/cf8385.bin" },
	{ MODEL_8385, "libertas_cs_helper.fw", "libertas_cs.fw" },
	{ 0, NULL, NULL }
};
MODULE_FIRMWARE("libertas/cf8305.bin");
MODULE_FIRMWARE("libertas/cf8381_helper.bin");
MODULE_FIRMWARE("libertas/cf8381.bin");
MODULE_FIRMWARE("libertas/cf8385_helper.bin");
MODULE_FIRMWARE("libertas/cf8385.bin");
MODULE_FIRMWARE("libertas_cs_helper.fw");
MODULE_FIRMWARE("libertas_cs.fw");


/********************************************************************/
/* 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

/*
 * FIXME: just use the 'driver_info' field of 'struct pcmcia_device_id' when
 * that gets fixed.  Currently there's no way to access it from the probe hook.
 */
static inline u32 get_model(u16 manf_id, u16 card_id)
{
	/* NOTE: keep in sync with if_cs_ids */
	if (manf_id == CF8305_MANFID && card_id == CF8305_CARDID)
		return MODEL_8305;
	else if (manf_id == CF8381_MANFID && card_id == CF8381_CARDID)
		return MODEL_8381;
	else if (manf_id == CF8385_MANFID && card_id == CF8385_CARDID)
		return MODEL_8385;
	return MODEL_UNKNOWN;
}

/********************************************************************/
/* 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) {
			netdev_err(priv->dev, "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) {
		netdev_err(priv->dev, "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)) {
		netdev_err(priv->dev,
			   "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) {
		netdev_err(priv->dev,
			   "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, const struct firmware *fw)
{
	int ret = 0;
	int sent = 0;
	u8  scratch;

	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;
	}

	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) {
			pr_err("can't download helper at 0x%x, ret %d\n",
			       sent, ret);
			goto done;
		}

		if (count == 0)
			break;

		sent += count;
	}

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);

	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) {
		pr_err("helper firmware doesn't answer\n");
		goto done;
	}

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

		if (retry > 20) {
			pr_err("could not download firmware\n");
			ret = -ENODEV;
			goto done;
		}
		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) {
			pr_err("can't download firmware at 0x%x\n", sent);
			goto done;
		}
	}

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

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

static void if_cs_prog_firmware(struct lbs_private *priv, int ret,
				 const struct firmware *helper,
				 const struct firmware *mainfw)
{
	struct if_cs_card *card = priv->card;

	if (ret) {
		pr_err("failed to find firmware (%d)\n", ret);
		return;
	}

	/* Load the firmware */
	ret = if_cs_prog_helper(card, helper);
	if (ret == 0 && (card->model != MODEL_8305))
		ret = if_cs_prog_real(card, mainfw);
	if (ret)
		return;

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

	/*
	 * Clear any interrupt cause that happened 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 */
	priv->fw_ready = 1;
	if (lbs_start_card(priv) != 0) {
		pr_err("could not activate card\n");
		free_irq(card->p_dev->irq, card);
	}
}


/********************************************************************/
/* 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:
		netdev_err(priv->dev, "%s: unsupported type %d\n",
			   __func__, type);
	}

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


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);
}


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) {
		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)
		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)) {
		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) {
		pr_err("error in ioport_map\n");
		ret = -EIO;
		goto out1;
	}

	ret = pcmcia_enable_device(p_dev);
	if (ret) {
		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 cannot. That's especially true for the CF8305 card.
	 */
	card->align_regs = false;

	card->model = get_model(p_dev->manf_id, p_dev->card_id);
	if (card->model == MODEL_UNKNOWN) {
		pr_err("unsupported manf_id 0x%04x / card_id 0x%04x\n",
		       p_dev->manf_id, p_dev->card_id);
		ret = -ENODEV;
		goto out2;
	}

	/* Check if we have a current silicon */
	prod_id = if_cs_read8(card, IF_CS_PRODUCT_ID);
	if (card->model == MODEL_8305) {
		card->align_regs = true;
		if (prod_id < IF_CS_CF8305_B1_REV) {
			pr_err("8305 rev B0 and older are not supported\n");
			ret = -ENODEV;
			goto out2;
		}
	}

	if ((card->model == MODEL_8381) && prod_id < IF_CS_CF8381_B3_REV) {
		pr_err("8381 rev B2 and older are not supported\n");
		ret = -ENODEV;
		goto out2;
	}

	if ((card->model == MODEL_8385) && prod_id < IF_CS_CF8385_B1_REV) {
		pr_err("8385 rev B0 and older are not supported\n");
		ret = -ENODEV;
		goto out2;
	}

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

	/* Set 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;

	/* Get firmware */
	ret = lbs_get_firmware_async(priv, &p_dev->dev, card->model, fw_table,
				     if_cs_prog_firmware);
	if (ret) {
		pr_err("failed to find firmware (%d)\n", ret);
		goto out3;
	}

	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;
}


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 const 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),
	/* NOTE: keep in sync with get_model() */
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, if_cs_ids);

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