summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/prism54/islpci_dev.c
blob: 9196825ed1b52539d92aad7bfa7de1db7c88529d (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
/*
 *  Copyright (C) 2002 Intersil Americas Inc.
 *  Copyright (C) 2003 Herbert Valerio Riedel <hvr@gnu.org>
 *  Copyright (C) 2003 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>
 *
 *  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
 *
 *  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; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>

#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/if_arp.h>

#include <asm/io.h>

#include "prismcompat.h"
#include "isl_38xx.h"
#include "isl_ioctl.h"
#include "islpci_dev.h"
#include "islpci_mgt.h"
#include "islpci_eth.h"
#include "oid_mgt.h"

#define ISL3877_IMAGE_FILE	"isl3877"
#define ISL3886_IMAGE_FILE	"isl3886"
#define ISL3890_IMAGE_FILE	"isl3890"

static int prism54_bring_down(islpci_private *);
static int islpci_alloc_memory(islpci_private *);
static struct net_device_stats *islpci_statistics(struct net_device *);

/* Temporary dummy MAC address to use until firmware is loaded.
 * The idea there is that some tools (such as nameif) may query
 * the MAC address before the netdev is 'open'. By using a valid
 * OUI prefix, they can process the netdev properly.
 * Of course, this is not the final/real MAC address. It doesn't
 * matter, as you are suppose to be able to change it anytime via
 * ndev->set_mac_address. Jean II */
static const unsigned char	dummy_mac[6] = { 0x00, 0x30, 0xB4, 0x00, 0x00, 0x00 };

static int
isl_upload_firmware(islpci_private *priv)
{
	u32 reg, rc;
	void __iomem *device_base = priv->device_base;

	/* clear the RAMBoot and the Reset bit */
	reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
	reg &= ~ISL38XX_CTRL_STAT_RESET;
	reg &= ~ISL38XX_CTRL_STAT_RAMBOOT;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	/* set the Reset bit without reading the register ! */
	reg |= ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	/* clear the Reset bit */
	reg &= ~ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();

	/* wait a while for the device to reboot */
	mdelay(50);

	{
		const struct firmware *fw_entry = NULL;
		long fw_len;
		const u32 *fw_ptr;

		rc = request_firmware(&fw_entry, priv->firmware, PRISM_FW_PDEV);
		if (rc) {
			printk(KERN_ERR
			       "%s: request_firmware() failed for '%s'\n",
			       "prism54", priv->firmware);
			return rc;
		}
		/* prepare the Direct Memory Base register */
		reg = ISL38XX_DEV_FIRMWARE_ADDRES;

		fw_ptr = (u32 *) fw_entry->data;
		fw_len = fw_entry->size;

		if (fw_len % 4) {
			printk(KERN_ERR
			       "%s: firmware '%s' size is not multiple of 32bit, aborting!\n",
			       "prism54", priv->firmware);
			release_firmware(fw_entry);
			return -EILSEQ; /* Illegal byte sequence  */;
		}

		while (fw_len > 0) {
			long _fw_len =
			    (fw_len >
			     ISL38XX_MEMORY_WINDOW_SIZE) ?
			    ISL38XX_MEMORY_WINDOW_SIZE : fw_len;
			u32 __iomem *dev_fw_ptr = device_base + ISL38XX_DIRECT_MEM_WIN;

			/* set the card's base address for writing the data */
			isl38xx_w32_flush(device_base, reg,
					  ISL38XX_DIR_MEM_BASE_REG);
			wmb();	/* be paranoid */

			/* increment the write address for next iteration */
			reg += _fw_len;
			fw_len -= _fw_len;

			/* write the data to the Direct Memory Window 32bit-wise */
			/* memcpy_toio() doesn't guarantee 32bit writes :-| */
			while (_fw_len > 0) {
				/* use non-swapping writel() */
				__raw_writel(*fw_ptr, dev_fw_ptr);
				fw_ptr++, dev_fw_ptr++;
				_fw_len -= 4;
			}

			/* flush PCI posting */
			(void) readl(device_base + ISL38XX_PCI_POSTING_FLUSH);
			wmb();	/* be paranoid again */

			BUG_ON(_fw_len != 0);
		}

		BUG_ON(fw_len != 0);

		/* Firmware version is at offset 40 (also for "newmac") */
		printk(KERN_DEBUG "%s: firmware version: %.8s\n",
		       priv->ndev->name, fw_entry->data + 40);

		release_firmware(fw_entry);
	}

	/* now reset the device
	 * clear the Reset & ClkRun bit, set the RAMBoot bit */
	reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
	reg &= ~ISL38XX_CTRL_STAT_CLKRUN;
	reg &= ~ISL38XX_CTRL_STAT_RESET;
	reg |= ISL38XX_CTRL_STAT_RAMBOOT;
	isl38xx_w32_flush(device_base, reg, ISL38XX_CTRL_STAT_REG);
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	/* set the reset bit latches the host override and RAMBoot bits
	 * into the device for operation when the reset bit is reset */
	reg |= ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	/* don't do flush PCI posting here! */
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	/* clear the reset bit should start the whole circus */
	reg &= ~ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	/* don't do flush PCI posting here! */
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	return 0;
}

/******************************************************************************
    Device Interrupt Handler
******************************************************************************/

irqreturn_t
islpci_interrupt(int irq, void *config)
{
	u32 reg;
	islpci_private *priv = config;
	struct net_device *ndev = priv->ndev;
	void __iomem *device = priv->device_base;
	int powerstate = ISL38XX_PSM_POWERSAVE_STATE;

	/* lock the interrupt handler */
	spin_lock(&priv->slock);

	/* received an interrupt request on a shared IRQ line
	 * first check whether the device is in sleep mode */
	reg = readl(device + ISL38XX_CTRL_STAT_REG);
	if (reg & ISL38XX_CTRL_STAT_SLEEPMODE)
		/* device is in sleep mode, IRQ was generated by someone else */
	{
#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_TRACING, "Assuming someone else called the IRQ\n");
#endif
		spin_unlock(&priv->slock);
		return IRQ_NONE;
	}


	/* check whether there is any source of interrupt on the device */
	reg = readl(device + ISL38XX_INT_IDENT_REG);

	/* also check the contents of the Interrupt Enable Register, because this
	 * will filter out interrupt sources from other devices on the same irq ! */
	reg &= readl(device + ISL38XX_INT_EN_REG);
	reg &= ISL38XX_INT_SOURCES;

	if (reg != 0) {
		if (islpci_get_state(priv) != PRV_STATE_SLEEP)
			powerstate = ISL38XX_PSM_ACTIVE_STATE;

		/* reset the request bits in the Identification register */
		isl38xx_w32_flush(device, reg, ISL38XX_INT_ACK_REG);

#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_FUNCTION_CALLS,
		      "IRQ: Identification register 0x%p 0x%x \n", device, reg);
#endif

		/* check for each bit in the register separately */
		if (reg & ISL38XX_INT_IDENT_UPDATE) {
#if VERBOSE > SHOW_ERROR_MESSAGES
			/* Queue has been updated */
			DEBUG(SHOW_TRACING, "IRQ: Update flag \n");

			DEBUG(SHOW_QUEUE_INDEXES,
			      "CB drv Qs: [%i][%i][%i][%i][%i][%i]\n",
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[0]),
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[1]),
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[2]),
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[3]),
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[4]),
			      le32_to_cpu(priv->control_block->
					  driver_curr_frag[5])
			    );

			DEBUG(SHOW_QUEUE_INDEXES,
			      "CB dev Qs: [%i][%i][%i][%i][%i][%i]\n",
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[0]),
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[1]),
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[2]),
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[3]),
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[4]),
			      le32_to_cpu(priv->control_block->
					  device_curr_frag[5])
			    );
#endif

			/* cleanup the data low transmit queue */
			islpci_eth_cleanup_transmit(priv, priv->control_block);

			/* device is in active state, update the
			 * powerstate flag if necessary */
			powerstate = ISL38XX_PSM_ACTIVE_STATE;

			/* check all three queues in priority order
			 * call the PIMFOR receive function until the
			 * queue is empty */
			if (isl38xx_in_queue(priv->control_block,
						ISL38XX_CB_RX_MGMTQ) != 0) {
#if VERBOSE > SHOW_ERROR_MESSAGES
				DEBUG(SHOW_TRACING,
				      "Received frame in Management Queue\n");
#endif
				islpci_mgt_receive(ndev);

				islpci_mgt_cleanup_transmit(ndev);

				/* Refill slots in receive queue */
				islpci_mgmt_rx_fill(ndev);

				/* no need to trigger the device, next
                                   islpci_mgt_transaction does it */
			}

			while (isl38xx_in_queue(priv->control_block,
						ISL38XX_CB_RX_DATA_LQ) != 0) {
#if VERBOSE > SHOW_ERROR_MESSAGES
				DEBUG(SHOW_TRACING,
				      "Received frame in Data Low Queue \n");
#endif
				islpci_eth_receive(priv);
			}

			/* check whether the data transmit queues were full */
			if (priv->data_low_tx_full) {
				/* check whether the transmit is not full anymore */
				if (ISL38XX_CB_TX_QSIZE -
				    isl38xx_in_queue(priv->control_block,
						     ISL38XX_CB_TX_DATA_LQ) >=
				    ISL38XX_MIN_QTHRESHOLD) {
					/* nope, the driver is ready for more network frames */
					netif_wake_queue(priv->ndev);

					/* reset the full flag */
					priv->data_low_tx_full = 0;
				}
			}
		}

		if (reg & ISL38XX_INT_IDENT_INIT) {
			/* Device has been initialized */
#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING,
			      "IRQ: Init flag, device initialized \n");
#endif
			wake_up(&priv->reset_done);
		}

		if (reg & ISL38XX_INT_IDENT_SLEEP) {
			/* Device intends to move to powersave state */
#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "IRQ: Sleep flag \n");
#endif
			isl38xx_handle_sleep_request(priv->control_block,
						     &powerstate,
						     priv->device_base);
		}

		if (reg & ISL38XX_INT_IDENT_WAKEUP) {
			/* Device has been woken up to active state */
#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "IRQ: Wakeup flag \n");
#endif

			isl38xx_handle_wakeup(priv->control_block,
					      &powerstate, priv->device_base);
		}
	} else {
#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_TRACING, "Assuming someone else called the IRQ\n");
#endif
		spin_unlock(&priv->slock);
		return IRQ_NONE;
	}

	/* sleep -> ready */
	if (islpci_get_state(priv) == PRV_STATE_SLEEP
	    && powerstate == ISL38XX_PSM_ACTIVE_STATE)
		islpci_set_state(priv, PRV_STATE_READY);

	/* !sleep -> sleep */
	if (islpci_get_state(priv) != PRV_STATE_SLEEP
	    && powerstate == ISL38XX_PSM_POWERSAVE_STATE)
		islpci_set_state(priv, PRV_STATE_SLEEP);

	/* unlock the interrupt handler */
	spin_unlock(&priv->slock);

	return IRQ_HANDLED;
}

/******************************************************************************
    Network Interface Control & Statistical functions
******************************************************************************/
static int
islpci_open(struct net_device *ndev)
{
	u32 rc;
	islpci_private *priv = netdev_priv(ndev);

	/* reset data structures, upload firmware and reset device */
	rc = islpci_reset(priv,1);
	if (rc) {
		prism54_bring_down(priv);
		return rc; /* Returns informative message */
	}

	netif_start_queue(ndev);

	/* Turn off carrier if in STA or Ad-hoc mode. It will be turned on
	 * once the firmware receives a trap of being associated
	 * (GEN_OID_LINKSTATE). In other modes (AP or WDS or monitor) we
	 * should just leave the carrier on as its expected the firmware
	 * won't send us a trigger. */
	if (priv->iw_mode == IW_MODE_INFRA || priv->iw_mode == IW_MODE_ADHOC)
		netif_carrier_off(ndev);
	else
		netif_carrier_on(ndev);

	return 0;
}

static int
islpci_close(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);

	printk(KERN_DEBUG "%s: islpci_close ()\n", ndev->name);

	netif_stop_queue(ndev);

	return prism54_bring_down(priv);
}

static int
prism54_bring_down(islpci_private *priv)
{
	void __iomem *device_base = priv->device_base;
	u32 reg;
	/* we are going to shutdown the device */
	islpci_set_state(priv, PRV_STATE_PREBOOT);

	/* disable all device interrupts in case they weren't */
	isl38xx_disable_interrupts(priv->device_base);

	/* For safety reasons, we may want to ensure that no DMA transfer is
	 * currently in progress by emptying the TX and RX queues. */

	/* wait until interrupts have finished executing on other CPUs */
	synchronize_irq(priv->pdev->irq);

	reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
	reg &= ~(ISL38XX_CTRL_STAT_RESET | ISL38XX_CTRL_STAT_RAMBOOT);
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	reg |= ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();
	udelay(ISL38XX_WRITEIO_DELAY);

	/* clear the Reset bit */
	reg &= ~ISL38XX_CTRL_STAT_RESET;
	writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
	wmb();

	/* wait a while for the device to reset */
	schedule_timeout_uninterruptible(msecs_to_jiffies(50));

	return 0;
}

static int
islpci_upload_fw(islpci_private *priv)
{
	islpci_state_t old_state;
	u32 rc;

	old_state = islpci_set_state(priv, PRV_STATE_BOOT);

	printk(KERN_DEBUG "%s: uploading firmware...\n", priv->ndev->name);

	rc = isl_upload_firmware(priv);
	if (rc) {
		/* error uploading the firmware */
		printk(KERN_ERR "%s: could not upload firmware ('%s')\n",
		       priv->ndev->name, priv->firmware);

		islpci_set_state(priv, old_state);
		return rc;
	}

	printk(KERN_DEBUG "%s: firmware upload complete\n",
	       priv->ndev->name);

	islpci_set_state(priv, PRV_STATE_POSTBOOT);

	return 0;
}

static int
islpci_reset_if(islpci_private *priv)
{
	long remaining;
	int result = -ETIME;
	int count;

	DEFINE_WAIT(wait);
	prepare_to_wait(&priv->reset_done, &wait, TASK_UNINTERRUPTIBLE);

	/* now the last step is to reset the interface */
	isl38xx_interface_reset(priv->device_base, priv->device_host_address);
	islpci_set_state(priv, PRV_STATE_PREINIT);

        for(count = 0; count < 2 && result; count++) {
		/* The software reset acknowledge needs about 220 msec here.
		 * Be conservative and wait for up to one second. */

		remaining = schedule_timeout_uninterruptible(HZ);

		if(remaining > 0) {
			result = 0;
			break;
		}

		/* If we're here it's because our IRQ hasn't yet gone through.
		 * Retry a bit more...
		 */
		printk(KERN_ERR "%s: no 'reset complete' IRQ seen - retrying\n",
			priv->ndev->name);
	}

	finish_wait(&priv->reset_done, &wait);

	if (result) {
		printk(KERN_ERR "%s: interface reset failure\n", priv->ndev->name);
		return result;
	}

	islpci_set_state(priv, PRV_STATE_INIT);

	/* Now that the device is 100% up, let's allow
	 * for the other interrupts --
	 * NOTE: this is not *yet* true since we've only allowed the
	 * INIT interrupt on the IRQ line. We can perhaps poll
	 * the IRQ line until we know for sure the reset went through */
	isl38xx_enable_common_interrupts(priv->device_base);

	down_write(&priv->mib_sem);
	result = mgt_commit(priv);
	if (result) {
		printk(KERN_ERR "%s: interface reset failure\n", priv->ndev->name);
		up_write(&priv->mib_sem);
		return result;
	}
	up_write(&priv->mib_sem);

	islpci_set_state(priv, PRV_STATE_READY);

	printk(KERN_DEBUG "%s: interface reset complete\n", priv->ndev->name);
	return 0;
}

int
islpci_reset(islpci_private *priv, int reload_firmware)
{
	isl38xx_control_block *cb =    /* volatile not needed */
		(isl38xx_control_block *) priv->control_block;
	unsigned counter;
	int rc;

	if (reload_firmware)
		islpci_set_state(priv, PRV_STATE_PREBOOT);
	else
		islpci_set_state(priv, PRV_STATE_POSTBOOT);

	printk(KERN_DEBUG "%s: resetting device...\n", priv->ndev->name);

	/* disable all device interrupts in case they weren't */
	isl38xx_disable_interrupts(priv->device_base);

	/* flush all management queues */
	priv->index_mgmt_tx = 0;
	priv->index_mgmt_rx = 0;

	/* clear the indexes in the frame pointer */
	for (counter = 0; counter < ISL38XX_CB_QCOUNT; counter++) {
		cb->driver_curr_frag[counter] = cpu_to_le32(0);
		cb->device_curr_frag[counter] = cpu_to_le32(0);
	}

	/* reset the mgmt receive queue */
	for (counter = 0; counter < ISL38XX_CB_MGMT_QSIZE; counter++) {
		isl38xx_fragment *frag = &cb->rx_data_mgmt[counter];
		frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
		frag->flags = 0;
		frag->address = cpu_to_le32(priv->mgmt_rx[counter].pci_addr);
	}

	for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
		cb->rx_data_low[counter].address =
		    cpu_to_le32((u32) priv->pci_map_rx_address[counter]);
	}

	/* since the receive queues are filled with empty fragments, now we can
	 * set the corresponding indexes in the Control Block */
	priv->control_block->driver_curr_frag[ISL38XX_CB_RX_DATA_LQ] =
	    cpu_to_le32(ISL38XX_CB_RX_QSIZE);
	priv->control_block->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] =
	    cpu_to_le32(ISL38XX_CB_MGMT_QSIZE);

	/* reset the remaining real index registers and full flags */
	priv->free_data_rx = 0;
	priv->free_data_tx = 0;
	priv->data_low_tx_full = 0;

	if (reload_firmware) { /* Should we load the firmware ? */
	/* now that the data structures are cleaned up, upload
	 * firmware and reset interface */
		rc = islpci_upload_fw(priv);
		if (rc) {
			printk(KERN_ERR "%s: islpci_reset: failure\n",
				priv->ndev->name);
			return rc;
		}
	}

	/* finally reset interface */
	rc = islpci_reset_if(priv);
	if (rc)
		printk(KERN_ERR "prism54: Your card/socket may be faulty, or IRQ line too busy :(\n");
	return rc;
}

static struct net_device_stats *
islpci_statistics(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_statistics\n");
#endif

	return &priv->statistics;
}

/******************************************************************************
    Network device configuration functions
******************************************************************************/
static int
islpci_alloc_memory(islpci_private *priv)
{
	int counter;

#if VERBOSE > SHOW_ERROR_MESSAGES
	printk(KERN_DEBUG "islpci_alloc_memory\n");
#endif

	/* remap the PCI device base address to accessable */
	if (!(priv->device_base =
	      ioremap(pci_resource_start(priv->pdev, 0),
		      ISL38XX_PCI_MEM_SIZE))) {
		/* error in remapping the PCI device memory address range */
		printk(KERN_ERR "PCI memory remapping failed \n");
		return -1;
	}

	/* memory layout for consistent DMA region:
	 *
	 * Area 1: Control Block for the device interface
	 * Area 2: Power Save Mode Buffer for temporary frame storage. Be aware that
	 *         the number of supported stations in the AP determines the minimal
	 *         size of the buffer !
	 */

	/* perform the allocation */
	priv->driver_mem_address = pci_alloc_consistent(priv->pdev,
							HOST_MEM_BLOCK,
							&priv->
							device_host_address);

	if (!priv->driver_mem_address) {
		/* error allocating the block of PCI memory */
		printk(KERN_ERR "%s: could not allocate DMA memory, aborting!",
		       "prism54");
		return -1;
	}

	/* assign the Control Block to the first address of the allocated area */
	priv->control_block =
	    (isl38xx_control_block *) priv->driver_mem_address;

	/* set the Power Save Buffer pointer directly behind the CB */
	priv->device_psm_buffer =
		priv->device_host_address + CONTROL_BLOCK_SIZE;

	/* make sure all buffer pointers are initialized */
	for (counter = 0; counter < ISL38XX_CB_QCOUNT; counter++) {
		priv->control_block->driver_curr_frag[counter] = cpu_to_le32(0);
		priv->control_block->device_curr_frag[counter] = cpu_to_le32(0);
	}

	priv->index_mgmt_rx = 0;
	memset(priv->mgmt_rx, 0, sizeof(priv->mgmt_rx));
	memset(priv->mgmt_tx, 0, sizeof(priv->mgmt_tx));

	/* allocate rx queue for management frames */
	if (islpci_mgmt_rx_fill(priv->ndev) < 0)
		goto out_free;

	/* now get the data rx skb's */
	memset(priv->data_low_rx, 0, sizeof (priv->data_low_rx));
	memset(priv->pci_map_rx_address, 0, sizeof (priv->pci_map_rx_address));

	for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
		struct sk_buff *skb;

		/* allocate an sk_buff for received data frames storage
		 * each frame on receive size consists of 1 fragment
		 * include any required allignment operations */
		if (!(skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2))) {
			/* error allocating an sk_buff structure elements */
			printk(KERN_ERR "Error allocating skb.\n");
			skb = NULL;
			goto out_free;
		}
		skb_reserve(skb, (4 - (long) skb->data) & 0x03);
		/* add the new allocated sk_buff to the buffer array */
		priv->data_low_rx[counter] = skb;

		/* map the allocated skb data area to pci */
		priv->pci_map_rx_address[counter] =
		    pci_map_single(priv->pdev, (void *) skb->data,
				   MAX_FRAGMENT_SIZE_RX + 2,
				   PCI_DMA_FROMDEVICE);
		if (!priv->pci_map_rx_address[counter]) {
			/* error mapping the buffer to device
			   accessable memory address */
			printk(KERN_ERR "failed to map skb DMA'able\n");
			goto out_free;
		}
	}

	prism54_acl_init(&priv->acl);
	prism54_wpa_bss_ie_init(priv);
	if (mgt_init(priv))
		goto out_free;

	return 0;
 out_free:
	islpci_free_memory(priv);
	return -1;
}

int
islpci_free_memory(islpci_private *priv)
{
	int counter;

	if (priv->device_base)
		iounmap(priv->device_base);
	priv->device_base = NULL;

	/* free consistent DMA area... */
	if (priv->driver_mem_address)
		pci_free_consistent(priv->pdev, HOST_MEM_BLOCK,
				    priv->driver_mem_address,
				    priv->device_host_address);

	/* clear some dangling pointers */
	priv->driver_mem_address = NULL;
	priv->device_host_address = 0;
	priv->device_psm_buffer = 0;
	priv->control_block = NULL;

        /* clean up mgmt rx buffers */
        for (counter = 0; counter < ISL38XX_CB_MGMT_QSIZE; counter++) {
		struct islpci_membuf *buf = &priv->mgmt_rx[counter];
		if (buf->pci_addr)
			pci_unmap_single(priv->pdev, buf->pci_addr,
					 buf->size, PCI_DMA_FROMDEVICE);
		buf->pci_addr = 0;
		kfree(buf->mem);
		buf->size = 0;
		buf->mem = NULL;
        }

	/* clean up data rx buffers */
	for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
		if (priv->pci_map_rx_address[counter])
			pci_unmap_single(priv->pdev,
					 priv->pci_map_rx_address[counter],
					 MAX_FRAGMENT_SIZE_RX + 2,
					 PCI_DMA_FROMDEVICE);
		priv->pci_map_rx_address[counter] = 0;

		if (priv->data_low_rx[counter])
			dev_kfree_skb(priv->data_low_rx[counter]);
		priv->data_low_rx[counter] = NULL;
	}

	/* Free the acces control list and the WPA list */
	prism54_acl_clean(&priv->acl);
	prism54_wpa_bss_ie_clean(priv);
	mgt_clean(priv);

	return 0;
}

#if 0
static void
islpci_set_multicast_list(struct net_device *dev)
{
	/* put device into promisc mode and let network layer handle it */
}
#endif

static void islpci_ethtool_get_drvinfo(struct net_device *dev,
                                       struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
}

static struct ethtool_ops islpci_ethtool_ops = {
	.get_drvinfo = islpci_ethtool_get_drvinfo,
};

struct net_device *
islpci_setup(struct pci_dev *pdev)
{
	islpci_private *priv;
	struct net_device *ndev = alloc_etherdev(sizeof (islpci_private));

	if (!ndev)
		return ndev;

	pci_set_drvdata(pdev, ndev);
#if defined(SET_NETDEV_DEV)
	SET_NETDEV_DEV(ndev, &pdev->dev);
#endif

	/* setup the structure members */
	ndev->base_addr = pci_resource_start(pdev, 0);
	ndev->irq = pdev->irq;

	/* initialize the function pointers */
	ndev->open = &islpci_open;
	ndev->stop = &islpci_close;
	ndev->get_stats = &islpci_statistics;
	ndev->do_ioctl = &prism54_ioctl;
	ndev->wireless_handlers =
	    (struct iw_handler_def *) &prism54_handler_def;
	ndev->ethtool_ops = &islpci_ethtool_ops;

	ndev->hard_start_xmit = &islpci_eth_transmit;
	/* ndev->set_multicast_list = &islpci_set_multicast_list; */
	ndev->addr_len = ETH_ALEN;
	ndev->set_mac_address = &prism54_set_mac_address;
	/* Get a non-zero dummy MAC address for nameif. Jean II */
	memcpy(ndev->dev_addr, dummy_mac, 6);

#ifdef HAVE_TX_TIMEOUT
	ndev->watchdog_timeo = ISLPCI_TX_TIMEOUT;
	ndev->tx_timeout = &islpci_eth_tx_timeout;
#endif

	/* allocate a private device structure to the network device  */
	priv = netdev_priv(ndev);
	priv->ndev = ndev;
	priv->pdev = pdev;
	priv->monitor_type = ARPHRD_IEEE80211;
	priv->ndev->type = (priv->iw_mode == IW_MODE_MONITOR) ?
		priv->monitor_type : ARPHRD_ETHER;

	/* Add pointers to enable iwspy support. */
	priv->wireless_data.spy_data = &priv->spy_data;
	ndev->wireless_data = &priv->wireless_data;

	/* save the start and end address of the PCI memory area */
	ndev->mem_start = (unsigned long) priv->device_base;
	ndev->mem_end = ndev->mem_start + ISL38XX_PCI_MEM_SIZE;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_TRACING, "PCI Memory remapped to 0x%p\n", priv->device_base);
#endif

	init_waitqueue_head(&priv->reset_done);

	/* init the queue read locks, process wait counter */
	mutex_init(&priv->mgmt_lock);
	priv->mgmt_received = NULL;
	init_waitqueue_head(&priv->mgmt_wqueue);
	mutex_init(&priv->stats_lock);
	spin_lock_init(&priv->slock);

	/* init state machine with off#1 state */
	priv->state = PRV_STATE_OFF;
	priv->state_off = 1;

	/* initialize workqueue's */
	INIT_WORK(&priv->stats_work, prism54_update_stats);
	priv->stats_timestamp = 0;

	INIT_WORK(&priv->reset_task, islpci_do_reset_and_wake);
	priv->reset_task_pending = 0;

	/* allocate various memory areas */
	if (islpci_alloc_memory(priv))
		goto do_free_netdev;

	/* select the firmware file depending on the device id */
	switch (pdev->device) {
	case 0x3877:
		strcpy(priv->firmware, ISL3877_IMAGE_FILE);
		break;

	case 0x3886:
		strcpy(priv->firmware, ISL3886_IMAGE_FILE);
		break;

	default:
		strcpy(priv->firmware, ISL3890_IMAGE_FILE);
		break;
	}

	if (register_netdev(ndev)) {
		DEBUG(SHOW_ERROR_MESSAGES,
		      "ERROR: register_netdev() failed \n");
		goto do_islpci_free_memory;
	}

	return ndev;

      do_islpci_free_memory:
	islpci_free_memory(priv);
      do_free_netdev:
	pci_set_drvdata(pdev, NULL);
	free_netdev(ndev);
	priv = NULL;
	return NULL;
}

islpci_state_t
islpci_set_state(islpci_private *priv, islpci_state_t new_state)
{
	islpci_state_t old_state;

	/* lock */
	old_state = priv->state;

	/* this means either a race condition or some serious error in
	 * the driver code */
	switch (new_state) {
	case PRV_STATE_OFF:
		priv->state_off++;
	default:
		priv->state = new_state;
		break;

	case PRV_STATE_PREBOOT:
		/* there are actually many off-states, enumerated by
		 * state_off */
		if (old_state == PRV_STATE_OFF)
			priv->state_off--;

		/* only if hw_unavailable is zero now it means we either
		 * were in off#1 state, or came here from
		 * somewhere else */
		if (!priv->state_off)
			priv->state = new_state;
		break;
	};
#if 0
	printk(KERN_DEBUG "%s: state transition %d -> %d (off#%d)\n",
	       priv->ndev->name, old_state, new_state, priv->state_off);
#endif

	/* invariants */
	BUG_ON(priv->state_off < 0);
	BUG_ON(priv->state_off && (priv->state != PRV_STATE_OFF));
	BUG_ON(!priv->state_off && (priv->state == PRV_STATE_OFF));

	/* unlock */
	return old_state;
}