aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/mips/au1xxx-ide.c
blob: 71f27e955d877d86d89bd63862b5206670f28061 (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
/*
 * linux/drivers/ide/mips/au1xxx-ide.c  version 01.30.00        Aug. 02 2005
 *
 * BRIEF MODULE DESCRIPTION
 * AMD Alchemy Au1xxx IDE interface routines over the Static Bus
 *
 * Copyright (c) 2003-2005 AMD, Personal Connectivity Solutions
 *
 * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Note: for more information, please refer "AMD Alchemy Au1200/Au1550 IDE
 *       Interface and Linux Device Driver" Application Note.
 */
#undef REALLY_SLOW_IO           /* most systems can safely undef this */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#include <linux/init.h>
#include <linux/ide.h>
#include <linux/sysdev.h>

#include <linux/dma-mapping.h>

#include "ide-timing.h"

#include <asm/io.h>
#include <asm/mach-au1x00/au1xxx.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>

#include <asm/mach-au1x00/au1xxx_ide.h>

#define DRV_NAME	"au1200-ide"
#define DRV_VERSION	"1.0"
#define DRV_AUTHOR	"Enrico Walther <enrico.walther@amd.com> / Pete Popov <ppopov@embeddedalley.com>"

/* enable the burstmode in the dbdma */
#define IDE_AU1XXX_BURSTMODE	1

static _auide_hwif auide_hwif;
static int dbdma_init_done;

#if defined(CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA)

void auide_insw(unsigned long port, void *addr, u32 count)
{
	_auide_hwif *ahwif = &auide_hwif;
	chan_tab_t *ctp;
	au1x_ddma_desc_t *dp;

	if(!put_dest_flags(ahwif->rx_chan, (void*)addr, count << 1, 
			   DDMA_FLAGS_NOIE)) {
		printk(KERN_ERR "%s failed %d\n", __FUNCTION__, __LINE__);
		return;
	}
	ctp = *((chan_tab_t **)ahwif->rx_chan);
	dp = ctp->cur_ptr;
	while (dp->dscr_cmd0 & DSCR_CMD0_V)
		;
	ctp->cur_ptr = au1xxx_ddma_get_nextptr_virt(dp);
}

void auide_outsw(unsigned long port, void *addr, u32 count)
{
	_auide_hwif *ahwif = &auide_hwif;
	chan_tab_t *ctp;
	au1x_ddma_desc_t *dp;

	if(!put_source_flags(ahwif->tx_chan, (void*)addr,
			     count << 1, DDMA_FLAGS_NOIE)) {
		printk(KERN_ERR "%s failed %d\n", __FUNCTION__, __LINE__);
		return;
	}
	ctp = *((chan_tab_t **)ahwif->tx_chan);
	dp = ctp->cur_ptr;
	while (dp->dscr_cmd0 & DSCR_CMD0_V)
		;
	ctp->cur_ptr = au1xxx_ddma_get_nextptr_virt(dp);
}

#endif

static void auide_tune_drive(ide_drive_t *drive, byte pio)
{
	int mem_sttime;
	int mem_stcfg;
	u8 speed;

	/* get the best pio mode for the drive */
	pio = ide_get_best_pio_mode(drive, pio, 4, NULL);

	printk(KERN_INFO "%s: setting Au1XXX IDE to PIO mode%d\n",
	       drive->name, pio);

	mem_sttime = 0;
	mem_stcfg  = au_readl(MEM_STCFG2);

	/* set pio mode! */
	switch(pio) {
	case 0:
		mem_sttime = SBC_IDE_TIMING(PIO0);

		/* set configuration for RCS2# */
		mem_stcfg |= TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_PIO0_TCSOE | SBC_IDE_PIO0_TOECS;
		break;

	case 1:
		mem_sttime = SBC_IDE_TIMING(PIO1);

		/* set configuration for RCS2# */
		mem_stcfg |= TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_PIO1_TCSOE | SBC_IDE_PIO1_TOECS;
		break;

	case 2:
		mem_sttime = SBC_IDE_TIMING(PIO2);

		/* set configuration for RCS2# */
		mem_stcfg &= ~TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_PIO2_TCSOE | SBC_IDE_PIO2_TOECS;
		break;

	case 3:
		mem_sttime = SBC_IDE_TIMING(PIO3);

		/* set configuration for RCS2# */
		mem_stcfg &= ~TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_PIO3_TCSOE | SBC_IDE_PIO3_TOECS;

		break;

	case 4:
		mem_sttime = SBC_IDE_TIMING(PIO4);

		/* set configuration for RCS2# */
		mem_stcfg &= ~TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_PIO4_TCSOE | SBC_IDE_PIO4_TOECS;
		break;
	}

	au_writel(mem_sttime,MEM_STTIME2);
	au_writel(mem_stcfg,MEM_STCFG2);

	speed = pio + XFER_PIO_0;
	ide_config_drive_speed(drive, speed);
}

static int auide_tune_chipset (ide_drive_t *drive, u8 speed)
{
	int mem_sttime;
	int mem_stcfg;
	unsigned long mode;

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
	if (ide_use_dma(drive))
		mode = ide_dma_speed(drive, 0);
#endif

	mem_sttime = 0;
	mem_stcfg  = au_readl(MEM_STCFG2);

	if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) {
		auide_tune_drive(drive, speed - XFER_PIO_0);
		return 0;
	}
	      
	switch(speed) {
#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
	case XFER_MW_DMA_2:
		mem_sttime = SBC_IDE_TIMING(MDMA2);

		/* set configuration for RCS2# */
		mem_stcfg &= ~TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_MDMA2_TCSOE | SBC_IDE_MDMA2_TOECS;

		mode = XFER_MW_DMA_2;
		break;
	case XFER_MW_DMA_1:
		mem_sttime = SBC_IDE_TIMING(MDMA1);

		/* set configuration for RCS2# */
		mem_stcfg &= ~TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_MDMA1_TCSOE | SBC_IDE_MDMA1_TOECS;

		mode = XFER_MW_DMA_1;
		break;
	case XFER_MW_DMA_0:
		mem_sttime = SBC_IDE_TIMING(MDMA0);

		/* set configuration for RCS2# */
		mem_stcfg |= TS_MASK;
		mem_stcfg &= ~TCSOE_MASK;
		mem_stcfg &= ~TOECS_MASK;
		mem_stcfg |= SBC_IDE_MDMA0_TCSOE | SBC_IDE_MDMA0_TOECS;

		mode = XFER_MW_DMA_0;
		break;
#endif
	default:
		return 1;
	}
	
	if (ide_config_drive_speed(drive, mode))
		return 1;

	au_writel(mem_sttime,MEM_STTIME2);
	au_writel(mem_stcfg,MEM_STCFG2);

	return 0;
}

/*
 * Multi-Word DMA + DbDMA functions
 */

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA

static int auide_build_sglist(ide_drive_t *drive,  struct request *rq)
{
	ide_hwif_t *hwif = drive->hwif;
	_auide_hwif *ahwif = (_auide_hwif*)hwif->hwif_data;
	struct scatterlist *sg = hwif->sg_table;

	ide_map_sg(drive, rq);

	if (rq_data_dir(rq) == READ)
		hwif->sg_dma_direction = DMA_FROM_DEVICE;
	else
		hwif->sg_dma_direction = DMA_TO_DEVICE;

	return dma_map_sg(ahwif->dev, sg, hwif->sg_nents,
			  hwif->sg_dma_direction);
}

static int auide_build_dmatable(ide_drive_t *drive)
{
	int i, iswrite, count = 0;
	ide_hwif_t *hwif = HWIF(drive);

	struct request *rq = HWGROUP(drive)->rq;

	_auide_hwif *ahwif = (_auide_hwif*)hwif->hwif_data;
	struct scatterlist *sg;

	iswrite = (rq_data_dir(rq) == WRITE);
	/* Save for interrupt context */
	ahwif->drive = drive;

	/* Build sglist */
	hwif->sg_nents = i = auide_build_sglist(drive, rq);

	if (!i)
		return 0;

	/* fill the descriptors */
	sg = hwif->sg_table;
	while (i && sg_dma_len(sg)) {
		u32 cur_addr;
		u32 cur_len;

		cur_addr = sg_dma_address(sg);
		cur_len = sg_dma_len(sg);

		while (cur_len) {
			u32 flags = DDMA_FLAGS_NOIE;
			unsigned int tc = (cur_len < 0xfe00)? cur_len: 0xfe00;

			if (++count >= PRD_ENTRIES) {
				printk(KERN_WARNING "%s: DMA table too small\n",
				       drive->name);
				goto use_pio_instead;
			}

			/* Lets enable intr for the last descriptor only */
			if (1==i)
				flags = DDMA_FLAGS_IE;
			else
				flags = DDMA_FLAGS_NOIE;

			if (iswrite) {
				if(!put_source_flags(ahwif->tx_chan, 
						     (void*)(page_address(sg->page) 
							     + sg->offset), 
						     tc, flags)) { 
					printk(KERN_ERR "%s failed %d\n", 
					       __FUNCTION__, __LINE__);
				}
			} else 
			{
				if(!put_dest_flags(ahwif->rx_chan, 
						   (void*)(page_address(sg->page) 
							   + sg->offset), 
						   tc, flags)) { 
					printk(KERN_ERR "%s failed %d\n", 
					       __FUNCTION__, __LINE__);
				}
			}

			cur_addr += tc;
			cur_len -= tc;
		}
		sg++;
		i--;
	}

	if (count)
		return 1;

 use_pio_instead:
	dma_unmap_sg(ahwif->dev,
		     hwif->sg_table,
		     hwif->sg_nents,
		     hwif->sg_dma_direction);

	return 0; /* revert to PIO for this request */
}

static int auide_dma_end(ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	_auide_hwif *ahwif = (_auide_hwif*)hwif->hwif_data;

	if (hwif->sg_nents) {
		dma_unmap_sg(ahwif->dev, hwif->sg_table, hwif->sg_nents,
			     hwif->sg_dma_direction);
		hwif->sg_nents = 0;
	}

	return 0;
}

static void auide_dma_start(ide_drive_t *drive )
{
}


static void auide_dma_exec_cmd(ide_drive_t *drive, u8 command)
{
	/* issue cmd to drive */
	ide_execute_command(drive, command, &ide_dma_intr,
			    (2*WAIT_CMD), NULL);
}

static int auide_dma_setup(ide_drive_t *drive)
{       	
	struct request *rq = HWGROUP(drive)->rq;

	if (!auide_build_dmatable(drive)) {
		ide_map_sg(drive, rq);
		return 1;
	}

	drive->waiting_for_dma = 1;
	return 0;
}

static int auide_dma_check(ide_drive_t *drive)
{
	u8 speed;

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA

	if( dbdma_init_done == 0 ){
		auide_hwif.white_list = ide_in_drive_list(drive->id,
							  dma_white_list);
		auide_hwif.black_list = ide_in_drive_list(drive->id,
							  dma_black_list);
		auide_hwif.drive = drive;
		auide_ddma_init(&auide_hwif);
		dbdma_init_done = 1;
	}
#endif

	/* Is the drive in our DMA black list? */

	if ( auide_hwif.black_list ) {
		drive->using_dma = 0;

		/* Borrowed the warning message from ide-dma.c */

		printk(KERN_WARNING "%s: Disabling DMA for %s (blacklisted)\n",
		       drive->name, drive->id->model);	       
	}
	else
		drive->using_dma = 1;

	speed = ide_find_best_mode(drive, XFER_PIO | XFER_MWDMA);
	
	if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
		return HWIF(drive)->ide_dma_on(drive);

	return HWIF(drive)->ide_dma_off_quietly(drive);
}

static int auide_dma_test_irq(ide_drive_t *drive)
{	
	if (drive->waiting_for_dma == 0)
		printk(KERN_WARNING "%s: ide_dma_test_irq \
                                     called while not waiting\n", drive->name);

	/* If dbdma didn't execute the STOP command yet, the
	 * active bit is still set
	 */
	drive->waiting_for_dma++;
	if (drive->waiting_for_dma >= DMA_WAIT_TIMEOUT) {
		printk(KERN_WARNING "%s: timeout waiting for ddma to \
                                     complete\n", drive->name);
		return 1;
	}
	udelay(10);
	return 0;
}

static int auide_dma_host_on(ide_drive_t *drive)
{
	return 0;
}

static int auide_dma_on(ide_drive_t *drive)
{
	drive->using_dma = 1;
	return auide_dma_host_on(drive);
}


static int auide_dma_host_off(ide_drive_t *drive)
{
	return 0;
}

static int auide_dma_off_quietly(ide_drive_t *drive)
{
	drive->using_dma = 0;
	return auide_dma_host_off(drive);
}

static int auide_dma_lostirq(ide_drive_t *drive)
{
	printk(KERN_ERR "%s: IRQ lost\n", drive->name);
	return 0;
}

static void auide_ddma_tx_callback(int irq, void *param, struct pt_regs *regs)
{
	_auide_hwif *ahwif = (_auide_hwif*)param;
	ahwif->drive->waiting_for_dma = 0;
}

static void auide_ddma_rx_callback(int irq, void *param, struct pt_regs *regs)
{
	_auide_hwif *ahwif = (_auide_hwif*)param;
	ahwif->drive->waiting_for_dma = 0;
}

#endif /* end CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA */

static void auide_init_dbdma_dev(dbdev_tab_t *dev, u32 dev_id, u32 tsize, u32 devwidth, u32 flags)
{
	dev->dev_id          = dev_id;
	dev->dev_physaddr    = (u32)AU1XXX_ATA_PHYS_ADDR;
	dev->dev_intlevel    = 0;
	dev->dev_intpolarity = 0;
	dev->dev_tsize       = tsize;
	dev->dev_devwidth    = devwidth;
	dev->dev_flags       = flags;
}
  
#if defined(CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA)

static int auide_dma_timeout(ide_drive_t *drive)
{
//      printk("%s\n", __FUNCTION__);

	printk(KERN_ERR "%s: DMA timeout occurred: ", drive->name);

	if (HWIF(drive)->ide_dma_test_irq(drive))
		return 0;

	return HWIF(drive)->ide_dma_end(drive);
}
					

static int auide_ddma_init(_auide_hwif *auide) {
	
	dbdev_tab_t source_dev_tab, target_dev_tab;
	u32 dev_id, tsize, devwidth, flags;
	ide_hwif_t *hwif = auide->hwif;

	dev_id   = AU1XXX_ATA_DDMA_REQ;

	if (auide->white_list || auide->black_list) {
		tsize    = 8;
		devwidth = 32;
	}
	else { 
		tsize    = 1;
		devwidth = 16;
		
		printk(KERN_ERR "au1xxx-ide: %s is not on ide driver whitelist.\n",auide_hwif.drive->id->model);
		printk(KERN_ERR "            please read 'Documentation/mips/AU1xxx_IDE.README'");
	}

#ifdef IDE_AU1XXX_BURSTMODE 
	flags = DEV_FLAGS_SYNC | DEV_FLAGS_BURSTABLE;
#else
	flags = DEV_FLAGS_SYNC;
#endif

	/* setup dev_tab for tx channel */
	auide_init_dbdma_dev( &source_dev_tab,
			      dev_id,
			      tsize, devwidth, DEV_FLAGS_OUT | flags);
 	auide->tx_dev_id = au1xxx_ddma_add_device( &source_dev_tab );

	auide_init_dbdma_dev( &source_dev_tab,
			      dev_id,
			      tsize, devwidth, DEV_FLAGS_IN | flags);
 	auide->rx_dev_id = au1xxx_ddma_add_device( &source_dev_tab );
	
	/* We also need to add a target device for the DMA */
	auide_init_dbdma_dev( &target_dev_tab,
			      (u32)DSCR_CMD0_ALWAYS,
			      tsize, devwidth, DEV_FLAGS_ANYUSE);
	auide->target_dev_id = au1xxx_ddma_add_device(&target_dev_tab);	
 
	/* Get a channel for TX */
	auide->tx_chan = au1xxx_dbdma_chan_alloc(auide->target_dev_id,
						 auide->tx_dev_id,
						 auide_ddma_tx_callback,
						 (void*)auide);
 
	/* Get a channel for RX */
	auide->rx_chan = au1xxx_dbdma_chan_alloc(auide->rx_dev_id,
						 auide->target_dev_id,
						 auide_ddma_rx_callback,
						 (void*)auide);

	auide->tx_desc_head = (void*)au1xxx_dbdma_ring_alloc(auide->tx_chan,
							     NUM_DESCRIPTORS);
	auide->rx_desc_head = (void*)au1xxx_dbdma_ring_alloc(auide->rx_chan,
							     NUM_DESCRIPTORS);
 
	hwif->dmatable_cpu = dma_alloc_coherent(auide->dev,
						PRD_ENTRIES * PRD_BYTES,        /* 1 Page */
						&hwif->dmatable_dma, GFP_KERNEL);
	
	au1xxx_dbdma_start( auide->tx_chan );
	au1xxx_dbdma_start( auide->rx_chan );
 
	return 0;
} 
#else
 
static int auide_ddma_init( _auide_hwif *auide )
{
	dbdev_tab_t source_dev_tab;
	int flags;

#ifdef IDE_AU1XXX_BURSTMODE 
	flags = DEV_FLAGS_SYNC | DEV_FLAGS_BURSTABLE;
#else
	flags = DEV_FLAGS_SYNC;
#endif

	/* setup dev_tab for tx channel */
	auide_init_dbdma_dev( &source_dev_tab,
			      (u32)DSCR_CMD0_ALWAYS,
			      8, 32, DEV_FLAGS_OUT | flags);
 	auide->tx_dev_id = au1xxx_ddma_add_device( &source_dev_tab );

	auide_init_dbdma_dev( &source_dev_tab,
			      (u32)DSCR_CMD0_ALWAYS,
			      8, 32, DEV_FLAGS_IN | flags);
 	auide->rx_dev_id = au1xxx_ddma_add_device( &source_dev_tab );
	
	/* Get a channel for TX */
	auide->tx_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
						 auide->tx_dev_id,
						 NULL,
						 (void*)auide);
 
	/* Get a channel for RX */
	auide->rx_chan = au1xxx_dbdma_chan_alloc(auide->rx_dev_id,
						 DSCR_CMD0_ALWAYS,
						 NULL,
						 (void*)auide);
 
	auide->tx_desc_head = (void*)au1xxx_dbdma_ring_alloc(auide->tx_chan,
							     NUM_DESCRIPTORS);
	auide->rx_desc_head = (void*)au1xxx_dbdma_ring_alloc(auide->rx_chan,
							     NUM_DESCRIPTORS);
 
	au1xxx_dbdma_start( auide->tx_chan );
	au1xxx_dbdma_start( auide->rx_chan );
 	
	return 0;
}
#endif

static void auide_setup_ports(hw_regs_t *hw, _auide_hwif *ahwif)
{
	int i;
	unsigned long *ata_regs = hw->io_ports;

	/* FIXME? */
	for (i = 0; i < IDE_CONTROL_OFFSET; i++) {
		*ata_regs++ = ahwif->regbase + (i << AU1XXX_ATA_REG_OFFSET);
	}

	/* set the Alternative Status register */
	*ata_regs = ahwif->regbase + (14 << AU1XXX_ATA_REG_OFFSET);
}

static int au_ide_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	_auide_hwif *ahwif = &auide_hwif;
	ide_hwif_t *hwif;
	struct resource *res;
	int ret = 0;

#if defined(CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA)
	char *mode = "MWDMA2";
#elif defined(CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA)
	char *mode = "PIO+DDMA(offload)";
#endif

	memset(&auide_hwif, 0, sizeof(_auide_hwif));
	auide_hwif.dev                  = 0;

	ahwif->dev = dev;
	ahwif->irq = platform_get_irq(pdev, 0);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (res == NULL) {
		pr_debug("%s %d: no base address\n", DRV_NAME, pdev->id);
		ret = -ENODEV;
		goto out;
	}
	if (ahwif->irq < 0) {
		pr_debug("%s %d: no IRQ\n", DRV_NAME, pdev->id);
		ret = -ENODEV;
		goto out;
	}

	if (!request_mem_region (res->start, res->end-res->start, pdev->name)) {
		pr_debug("%s: request_mem_region failed\n", DRV_NAME);
		ret =  -EBUSY;
		goto out;
	}

	ahwif->regbase = (u32)ioremap(res->start, res->end-res->start);
	if (ahwif->regbase == 0) {
		ret = -ENOMEM;
		goto out;
	}

	/* FIXME:  This might possibly break PCMCIA IDE devices */

	hwif                            = &ide_hwifs[pdev->id];
	hw_regs_t *hw 			= &hwif->hw;
	hwif->irq = hw->irq             = ahwif->irq;
	hwif->chipset                   = ide_au1xxx;

	auide_setup_ports(hw, ahwif);
	memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));

	hwif->ultra_mask                = 0x0;  /* Disable Ultra DMA */
#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
	hwif->mwdma_mask                = 0x07; /* Multimode-2 DMA  */
	hwif->swdma_mask                = 0x00;
#else
	hwif->mwdma_mask                = 0x0;
	hwif->swdma_mask                = 0x0;
#endif

	hwif->noprobe = 0;
	hwif->drives[0].unmask          = 1;
	hwif->drives[1].unmask          = 1;

	/* hold should be on in all cases */
	hwif->hold                      = 1;
	hwif->mmio                      = 2;

	/* If the user has selected DDMA assisted copies,
	   then set up a few local I/O function entry points 
	*/

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA	
	hwif->INSW                      = auide_insw;
	hwif->OUTSW                     = auide_outsw;
#endif

	hwif->tuneproc                  = &auide_tune_drive;
	hwif->speedproc                 = &auide_tune_chipset;

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
	hwif->ide_dma_off_quietly       = &auide_dma_off_quietly;
	hwif->ide_dma_timeout           = &auide_dma_timeout;

	hwif->ide_dma_check             = &auide_dma_check;
	hwif->dma_exec_cmd              = &auide_dma_exec_cmd;
	hwif->dma_start                 = &auide_dma_start;
	hwif->ide_dma_end               = &auide_dma_end;
	hwif->dma_setup                 = &auide_dma_setup;
	hwif->ide_dma_test_irq          = &auide_dma_test_irq;
	hwif->ide_dma_host_off          = &auide_dma_host_off;
	hwif->ide_dma_host_on           = &auide_dma_host_on;
	hwif->ide_dma_lostirq           = &auide_dma_lostirq;
	hwif->ide_dma_on                = &auide_dma_on;

	hwif->autodma                   = 1;
	hwif->drives[0].autodma         = hwif->autodma;
	hwif->drives[1].autodma         = hwif->autodma;
	hwif->atapi_dma                 = 1;

#else /* !CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA */
	hwif->autodma                   = 0;
	hwif->channel                   = 0;
	hwif->hold                      = 1;
	hwif->select_data               = 0;    /* no chipset-specific code */
	hwif->config_data               = 0;    /* no chipset-specific code */

	hwif->drives[0].autodma         = 0;
	hwif->drives[0].autotune        = 1;    /* 1=autotune, 2=noautotune, 0=default */
#endif
	hwif->drives[0].no_io_32bit     = 1;   

	auide_hwif.hwif                 = hwif;
	hwif->hwif_data                 = &auide_hwif;

#ifdef CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA           
	auide_ddma_init(&auide_hwif);
	dbdma_init_done = 1;
#endif

	probe_hwif_init(hwif);
	dev_set_drvdata(dev, hwif);

	printk(KERN_INFO "Au1xxx IDE(builtin) configured for %s\n", mode );

 out:
	return ret;
}

static int au_ide_remove(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct resource *res;
	ide_hwif_t *hwif = dev_get_drvdata(dev);
	_auide_hwif *ahwif = &auide_hwif;

	ide_unregister(hwif - ide_hwifs);

	iounmap((void *)ahwif->regbase);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, res->end - res->start);

	return 0;
}

static struct device_driver au1200_ide_driver = {
	.name		= "au1200-ide",
	.bus		= &platform_bus_type,
	.probe 		= au_ide_probe,
	.remove		= au_ide_remove,
};

static int __init au_ide_init(void)
{
	return driver_register(&au1200_ide_driver);
}

static void __exit au_ide_exit(void)
{
	driver_unregister(&au1200_ide_driver);
}

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AU1200 IDE driver");

module_init(au_ide_init);
module_exit(au_ide_exit);