aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/ps2esdi.c
blob: aef5a0ccabc9a045ee2417c4b993cca9b10e8728 (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
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
/* ps2esdi driver based on assembler code by Arindam Banerji,
   written by Peter De Schrijver */
/* Reassuring note to IBM : This driver was NOT developed by vice-versa
   engineering the PS/2's BIOS */
/* Dedicated to Wannes, Tofke, Ykke, Godot, Killroy and all those 
   other lovely fish out there... */
/* This code was written during the long and boring WINA 
   elections 1994 */
/* Thanks to Arindam Banerij for giving me the source of his driver */
/* This code may be freely distributed and modified in any way, 
   as long as these notes remain intact */

/*  Revised: 05/07/94 by Arindam Banerji (axb@cse.nd.edu) */
/*  Revised: 09/08/94 by Peter De Schrijver (stud11@cc4.kuleuven.ac.be)
   Thanks to Arindam Banerij for sending me the docs of the adapter */

/* BA Modified for ThinkPad 720 by Boris Ashkinazi */
/*                    (bash@vnet.ibm.com) 08/08/95 */

/* Modified further for ThinkPad-720C by Uri Blumenthal */
/*                    (uri@watson.ibm.com) Sep 11, 1995 */

/* TODO : 
   + Timeouts
   + Get disk parameters
   + DMA above 16MB
   + reset after read/write error
 */

#define DEVICE_NAME "PS/2 ESDI"

#include <linux/major.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/genhd.h>
#include <linux/ps2esdi.h>
#include <linux/blkdev.h>
#include <linux/mca-legacy.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/hdreg.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/mca_dma.h>
#include <asm/uaccess.h>

#define PS2ESDI_IRQ 14
#define MAX_HD 2
#define MAX_RETRIES 5
#define MAX_16BIT 65536
#define ESDI_TIMEOUT   0xf000
#define ESDI_STAT_TIMEOUT 4

#define TYPE_0_CMD_BLK_LENGTH 2
#define TYPE_1_CMD_BLK_LENGTH 4

static void reset_ctrl(void);

static int ps2esdi_geninit(void);

static void do_ps2esdi_request(request_queue_t * q);

static void ps2esdi_readwrite(int cmd, struct request *req);

static void ps2esdi_fill_cmd_block(u_short * cmd_blk, u_short cmd,
u_short cyl, u_short head, u_short sector, u_short length, u_char drive);

static int ps2esdi_out_cmd_blk(u_short * cmd_blk);

static void ps2esdi_prep_dma(char *buffer, u_short length, u_char dma_xmode);

static irqreturn_t ps2esdi_interrupt_handler(int irq, void *dev_id,
				      struct pt_regs *regs);
static void (*current_int_handler) (u_int) = NULL;
static void ps2esdi_normal_interrupt_handler(u_int);
static void ps2esdi_initial_reset_int_handler(u_int);
static void ps2esdi_geometry_int_handler(u_int);
static int ps2esdi_getgeo(struct block_device *bdev, struct hd_geometry *geo);

static int ps2esdi_read_status_words(int num_words, int max_words, u_short * buffer);

static void dump_cmd_complete_status(u_int int_ret_code);

static void ps2esdi_get_device_cfg(void);

static void ps2esdi_reset_timer(unsigned long unused);

static u_int dma_arb_level;		/* DMA arbitration level */

static DECLARE_WAIT_QUEUE_HEAD(ps2esdi_int);

static int no_int_yet;
static int ps2esdi_drives;
static u_short io_base;
static DEFINE_TIMER(esdi_timer, ps2esdi_reset_timer, 0, 0);
static int reset_status;
static int ps2esdi_slot = -1;
static int tp720esdi = 0;	/* Is it Integrated ESDI of ThinkPad-720? */
static int intg_esdi = 0;       /* If integrated adapter */
struct ps2esdi_i_struct {
	unsigned int head, sect, cyl, wpcom, lzone, ctl;
};
static DEFINE_SPINLOCK(ps2esdi_lock);
static struct request_queue *ps2esdi_queue;
static struct request *current_req;

#if 0
#if 0				/* try both - I don't know which one is better... UB */
static struct ps2esdi_i_struct ps2esdi_info[MAX_HD] =
{
	{4, 48, 1553, 0, 0, 0},
	{0, 0, 0, 0, 0, 0}};
#else
static struct ps2esdi_i_struct ps2esdi_info[MAX_HD] =
{
	{64, 32, 161, 0, 0, 0},
	{0, 0, 0, 0, 0, 0}};
#endif
#endif
static struct ps2esdi_i_struct ps2esdi_info[MAX_HD] =
{
	{0, 0, 0, 0, 0, 0},
	{0, 0, 0, 0, 0, 0}};

static struct block_device_operations ps2esdi_fops =
{
	.owner		= THIS_MODULE,
	.getgeo		= ps2esdi_getgeo,
};

static struct gendisk *ps2esdi_gendisk[2];

/* initialization routine called by ll_rw_blk.c   */
static int __init ps2esdi_init(void)
{

	int error = 0;

	/* register the device - pass the name and major number */
	if (register_blkdev(PS2ESDI_MAJOR, "ed"))
		return -EBUSY;

	/* set up some global information - indicating device specific info */
	ps2esdi_queue = blk_init_queue(do_ps2esdi_request, &ps2esdi_lock);
	if (!ps2esdi_queue) {
		unregister_blkdev(PS2ESDI_MAJOR, "ed");
		return -ENOMEM;
	}

	/* some minor housekeeping - setup the global gendisk structure */
	error = ps2esdi_geninit();
	if (error) {
		printk(KERN_WARNING "PS2ESDI: error initialising"
			" device, releasing resources\n");
		unregister_blkdev(PS2ESDI_MAJOR, "ed");
		blk_cleanup_queue(ps2esdi_queue);
		return error;
	}
	return 0;
}				/* ps2esdi_init */

#ifndef MODULE

module_init(ps2esdi_init);

#else

static int cyl[MAX_HD] = {-1,-1};
static int head[MAX_HD] = {-1, -1};
static int sect[MAX_HD] = {-1, -1};

module_param(tp720esdi, bool, 0);
module_param_array(cyl, int, NULL, 0);
module_param_array(head, int, NULL, 0);
module_param_array(sect, int, NULL, 0);
MODULE_LICENSE("GPL");

int init_module(void) {
	int drive;

	for(drive = 0; drive < MAX_HD; drive++) {
	        struct ps2esdi_i_struct *info = &ps2esdi_info[drive];

        	if (cyl[drive] != -1) {
		  	info->cyl = info->lzone = cyl[drive];
			info->wpcom = 0;
		}
        	if (head[drive] != -1) {
			info->head = head[drive];
			info->ctl = (head[drive] > 8 ? 8 : 0);
		}
        	if (sect[drive] != -1) info->sect = sect[drive];
	}
	return ps2esdi_init();
}

void
cleanup_module(void) {
	int i;
	if(ps2esdi_slot) {
		mca_mark_as_unused(ps2esdi_slot);
		mca_set_adapter_procfn(ps2esdi_slot, NULL, NULL);
	}
	release_region(io_base, 4);
	free_dma(dma_arb_level);
	free_irq(PS2ESDI_IRQ, &ps2esdi_gendisk);
	unregister_blkdev(PS2ESDI_MAJOR, "ed");
	blk_cleanup_queue(ps2esdi_queue);
	for (i = 0; i < ps2esdi_drives; i++) {
		del_gendisk(ps2esdi_gendisk[i]);
		put_disk(ps2esdi_gendisk[i]);
	}
}
#endif /* MODULE */

/* handles boot time command line parameters */
void __init tp720_setup(char *str, int *ints)
{
	/* no params, just sets the tp720esdi flag if it exists */

	printk("%s: TP 720 ESDI flag set\n", DEVICE_NAME);
	tp720esdi = 1;
}

void __init ed_setup(char *str, int *ints)
{
	int hdind = 0;

	/* handles 3 parameters only - corresponding to
	   1. Number of cylinders
	   2. Number of heads
	   3. Sectors/track
	 */

	if (ints[0] != 3)
		return;

	/* print out the information - seen at boot time */
	printk("%s: ints[0]=%d ints[1]=%d ints[2]=%d ints[3]=%d\n",
	       DEVICE_NAME, ints[0], ints[1], ints[2], ints[3]);

	/* set the index into device specific information table */
	if (ps2esdi_info[0].head != 0)
		hdind = 1;

	/* set up all the device information */
	ps2esdi_info[hdind].head = ints[2];
	ps2esdi_info[hdind].sect = ints[3];
	ps2esdi_info[hdind].cyl = ints[1];
	ps2esdi_info[hdind].wpcom = 0;
	ps2esdi_info[hdind].lzone = ints[1];
	ps2esdi_info[hdind].ctl = (ints[2] > 8 ? 8 : 0);
#if 0				/* this may be needed for PS2/Mod.80, but it hurts ThinkPad! */
	ps2esdi_drives = hdind + 1;	/* increment index for the next time */
#endif
}				/* ed_setup */

static int ps2esdi_getinfo(char *buf, int slot, void *d)
{
	int len = 0;

	len += sprintf(buf + len, "DMA Arbitration Level: %d\n",
		       dma_arb_level);
	len += sprintf(buf + len, "IO Port: %x\n", io_base);
	len += sprintf(buf + len, "IRQ: 14\n");
	len += sprintf(buf + len, "Drives: %d\n", ps2esdi_drives);

	return len;
}

/* ps2 esdi specific initialization - called thru the gendisk chain */
static int __init ps2esdi_geninit(void)
{
	/*
	   The first part contains the initialization code
	   for the ESDI disk subsystem.  All we really do
	   is search for the POS registers of the controller
	   to do some simple setup operations.  First, we
	   must ensure that the controller is installed,
	   enabled, and configured as PRIMARY.  Then we must
	   determine the DMA arbitration level being used by
	   the controller so we can handle data transfer
	   operations properly.  If all of this works, then
	   we will set the INIT_FLAG to a non-zero value.
	 */

	int slot = 0, i, reset_start, reset_end;
	u_char status;
	unsigned short adapterID;
	int error = 0;

	if ((slot = mca_find_adapter(INTG_ESDI_ID, 0)) != MCA_NOTFOUND) {
		adapterID = INTG_ESDI_ID;
		printk("%s: integrated ESDI adapter found in slot %d\n",
		       DEVICE_NAME, slot+1);
#ifndef MODULE
		mca_set_adapter_name(slot, "PS/2 Integrated ESDI");
#endif
	} else if ((slot = mca_find_adapter(NRML_ESDI_ID, 0)) != -1) {
		adapterID = NRML_ESDI_ID;
		printk("%s: normal ESDI adapter found in slot %d\n",
		       DEVICE_NAME, slot+1);
		mca_set_adapter_name(slot, "PS/2 ESDI");
	} else {
		return -ENODEV;
	}

	ps2esdi_slot = slot;
	mca_mark_as_used(slot);
	mca_set_adapter_procfn(slot, (MCA_ProcFn) ps2esdi_getinfo, NULL);

	/* Found the slot - read the POS register 2 to get the necessary
	   configuration and status information.  POS register 2 has the
	   following information :
	   Bit           Function
	   7             reserved = 0
	   6             arbitration method
	   0 - fairness enabled
	   1 - fairness disabled, linear priority assignment
	   5-2           arbitration level
	   1             alternate address
	   1              alternate address
	   0 - use addresses 0x3510 - 0x3517
	   0             adapter enable
	 */

	status = mca_read_stored_pos(slot, 2);
	/* is it enabled ? */
	if (!(status & STATUS_ENABLED)) {
		printk("%s: ESDI adapter disabled\n", DEVICE_NAME);
		error = -ENODEV;
		goto err_out1;
	}
	/* try to grab IRQ, and try to grab a slow IRQ if it fails, so we can
	   share with the SCSI driver */
	if (request_irq(PS2ESDI_IRQ, ps2esdi_interrupt_handler,
		  SA_INTERRUPT | SA_SHIRQ, "PS/2 ESDI", &ps2esdi_gendisk)
	    && request_irq(PS2ESDI_IRQ, ps2esdi_interrupt_handler,
			   SA_SHIRQ, "PS/2 ESDI", &ps2esdi_gendisk)
	    ) {
		printk("%s: Unable to get IRQ %d\n", DEVICE_NAME, PS2ESDI_IRQ);
		error = -EBUSY;
		goto err_out1;
	}
	if (status & STATUS_ALTERNATE)
		io_base = ALT_IO_BASE;
	else
		io_base = PRIMARY_IO_BASE;

	if (!request_region(io_base, 4, "ed")) {
		printk(KERN_WARNING"Unable to request region 0x%x\n", io_base);
		error = -EBUSY;
		goto err_out2;
	}
	/* get the dma arbitration level */
	dma_arb_level = (status >> 2) & 0xf;

	/* BA */
	printk("%s: DMA arbitration level : %d\n",
	       DEVICE_NAME, dma_arb_level);

	LITE_ON;
	current_int_handler = ps2esdi_initial_reset_int_handler;
	reset_ctrl();
	reset_status = 0;
	reset_start = jiffies;
	while (!reset_status) {
		init_timer(&esdi_timer);
		esdi_timer.expires = jiffies + HZ;
		esdi_timer.data = 0;
		add_timer(&esdi_timer);
		sleep_on(&ps2esdi_int);
	}
	reset_end = jiffies;
	LITE_OFF;
	printk("%s: reset interrupt after %d jiffies,  %u.%02u secs\n",
	       DEVICE_NAME, reset_end - reset_start, (reset_end - reset_start) / HZ,
	       (reset_end - reset_start) % HZ);


	/* Integrated ESDI Disk and Controller has only one drive! */
	if (adapterID == INTG_ESDI_ID) {/* if not "normal" PS2 ESDI adapter */
		ps2esdi_drives = 1;	/* then we have only one physical disk! */		intg_esdi = 1;
	}



	/* finally this part sets up some global data structures etc. */

	ps2esdi_get_device_cfg();

	/* some annoyance in the above routine returns TWO drives?
	 Is something else happining in the background?
	 Regaurdless we fix the # of drives again. AJK */
	/* Integrated ESDI Disk and Controller has only one drive! */
	if (adapterID == INTG_ESDI_ID)	/* if not "normal" PS2 ESDI adapter */
		ps2esdi_drives = 1;	/* Not three or two, ONE DAMNIT! */

	current_int_handler = ps2esdi_normal_interrupt_handler;

	if (request_dma(dma_arb_level, "ed") !=0) {
		printk(KERN_WARNING "PS2ESDI: Can't request dma-channel %d\n"
			,(int) dma_arb_level);
		error = -EBUSY;
		goto err_out3;
	}
	blk_queue_max_sectors(ps2esdi_queue, 128);

	error = -ENOMEM;
	for (i = 0; i < ps2esdi_drives; i++) {
		struct gendisk *disk = alloc_disk(64);
		if (!disk)
			goto err_out4;
		disk->major = PS2ESDI_MAJOR;
		disk->first_minor = i<<6;
		sprintf(disk->disk_name, "ed%c", 'a'+i);
		disk->fops = &ps2esdi_fops;
		ps2esdi_gendisk[i] = disk;
	}

	for (i = 0; i < ps2esdi_drives; i++) {
		struct gendisk *disk = ps2esdi_gendisk[i];
		set_capacity(disk, ps2esdi_info[i].head * ps2esdi_info[i].sect *
				ps2esdi_info[i].cyl);
		disk->queue = ps2esdi_queue;
		disk->private_data = &ps2esdi_info[i];
		add_disk(disk);
	}
	return 0;
err_out4:
	while (i--)
		put_disk(ps2esdi_gendisk[i]);
err_out3:
	release_region(io_base, 4);
err_out2:
	free_irq(PS2ESDI_IRQ, &ps2esdi_gendisk);
err_out1:
	if(ps2esdi_slot) {
		mca_mark_as_unused(ps2esdi_slot);
		mca_set_adapter_procfn(ps2esdi_slot, NULL, NULL);
	}
	return error;
}

static void __init ps2esdi_get_device_cfg(void)
{
	u_short cmd_blk[TYPE_0_CMD_BLK_LENGTH];

	/*BA */ printk("%s: Drive 0\n", DEVICE_NAME);
	current_int_handler = ps2esdi_geometry_int_handler;
	cmd_blk[0] = CMD_GET_DEV_CONFIG | 0x600;
	cmd_blk[1] = 0;
	no_int_yet = TRUE;
	ps2esdi_out_cmd_blk(cmd_blk);
	if (no_int_yet)
		sleep_on(&ps2esdi_int);

	if (ps2esdi_drives > 1) {
		printk("%s: Drive 1\n", DEVICE_NAME);	/*BA */
		cmd_blk[0] = CMD_GET_DEV_CONFIG | (1 << 5) | 0x600;
		cmd_blk[1] = 0;
		no_int_yet = TRUE;
		ps2esdi_out_cmd_blk(cmd_blk);
		if (no_int_yet)
			sleep_on(&ps2esdi_int);
	}			/* if second physical drive is present */
	return;
}

/* strategy routine that handles most of the IO requests */
static void do_ps2esdi_request(request_queue_t * q)
{
	struct request *req;
	/* since, this routine is called with interrupts cleared - they 
	   must be before it finishes  */

	req = elv_next_request(q);
	if (!req)
		return;

#if 0
	printk("%s:got request. device : %s command : %d  sector : %ld count : %ld, buffer: %p\n",
	       DEVICE_NAME,
	       req->rq_disk->disk_name,
	       req->cmd, req->sector,
	       req->current_nr_sectors, req->buffer);
#endif

	/* check for above 16Mb dmas */
	if (isa_virt_to_bus(req->buffer + req->current_nr_sectors * 512) > 16 * MB) {
		printk("%s: DMA above 16MB not supported\n", DEVICE_NAME);
		end_request(req, FAIL);
		return;
	}

	if (req->sector+req->current_nr_sectors > get_capacity(req->rq_disk)) {
		printk("Grrr. error. ps2esdi_drives: %d, %llu %llu\n",
		    ps2esdi_drives, req->sector,
		    (unsigned long long)get_capacity(req->rq_disk));
		end_request(req, FAIL);
		return;
	}

	switch (rq_data_dir(req)) {
	case READ:
		ps2esdi_readwrite(READ, req);
		break;
	case WRITE:
		ps2esdi_readwrite(WRITE, req);
		break;
	default:
		printk("%s: Unknown command\n", req->rq_disk->disk_name);
		end_request(req, FAIL);
		break;
	}		/* handle different commands */
}				/* main strategy routine */

/* resets the ESDI adapter */
static void reset_ctrl(void)
{

	u_long expire;
	u_short status;

	/* enable interrupts on the controller */
	status = inb(ESDI_INTRPT);
	outb((status & 0xe0) | ATT_EOI, ESDI_ATTN);	/* to be sure we don't have
							   any interrupt pending... */
	outb_p(CTRL_ENABLE_INTR, ESDI_CONTROL);

	/* read the ESDI status port - if the controller is not busy,
	   simply do a soft reset (fast) - otherwise we'll have to do a
	   hard (slow) reset.  */
	if (!(inb_p(ESDI_STATUS) & STATUS_BUSY)) {
		/*BA */ printk("%s: soft reset...\n", DEVICE_NAME);
		outb_p(CTRL_SOFT_RESET, ESDI_ATTN);
	}
	/* soft reset */ 
	else {
		/*BA */
		printk("%s: hard reset...\n", DEVICE_NAME);
		outb_p(CTRL_HARD_RESET, ESDI_CONTROL);
		expire = jiffies + 2*HZ;
		while (time_before(jiffies, expire));
		outb_p(1, ESDI_CONTROL);
	}			/* hard reset */


}				/* reset the controller */

/* called by the strategy routine to handle read and write requests */
static void ps2esdi_readwrite(int cmd, struct request *req)
{
	struct ps2esdi_i_struct *p = req->rq_disk->private_data;
	unsigned block = req->sector;
	unsigned count = req->current_nr_sectors;
	int drive = p - ps2esdi_info;
	u_short track, head, cylinder, sector;
	u_short cmd_blk[TYPE_1_CMD_BLK_LENGTH];

	/* do some relevant arithmatic */
	track = block / p->sect;
	head = track % p->head;
	cylinder = track / p->head;
	sector = block % p->sect;

#if 0
	printk("%s: cyl=%d head=%d sect=%d\n", DEVICE_NAME, cylinder, head, sector);
#endif
	/* call the routine that actually fills out a command block */
	ps2esdi_fill_cmd_block
	    (cmd_blk,
	     (cmd == READ) ? CMD_READ : CMD_WRITE,
	     cylinder, head, sector, count, drive);

	/* send the command block to the controller */
	current_req = req;
	spin_unlock_irq(&ps2esdi_lock);
	if (ps2esdi_out_cmd_blk(cmd_blk)) {
		spin_lock_irq(&ps2esdi_lock);
		printk("%s: Controller failed\n", DEVICE_NAME);
		if ((++req->errors) >= MAX_RETRIES)
			end_request(req, FAIL);
	}
	/* check for failure to put out the command block */ 
	else {
		spin_lock_irq(&ps2esdi_lock);
#if 0
		printk("%s: waiting for xfer\n", DEVICE_NAME);
#endif
		/* turn disk lights on */
		LITE_ON;
	}

}				/* ps2esdi_readwrite */

/* fill out the command block */
static void ps2esdi_fill_cmd_block(u_short * cmd_blk, u_short cmd,
 u_short cyl, u_short head, u_short sector, u_short length, u_char drive)
{

	cmd_blk[0] = (drive << 5) | cmd;
	cmd_blk[1] = length;
	cmd_blk[2] = ((cyl & 0x1f) << 11) | (head << 5) | sector;
	cmd_blk[3] = (cyl & 0x3E0) >> 5;

}				/* fill out the command block */

/* write a command block to the controller */
static int ps2esdi_out_cmd_blk(u_short * cmd_blk)
{

	int i;
	unsigned long jif;
	u_char status;

	/* enable interrupts */
	outb(CTRL_ENABLE_INTR, ESDI_CONTROL);

	/* do not write to the controller, if it is busy */
	for (jif = jiffies + ESDI_STAT_TIMEOUT;
		time_after(jif, jiffies) &&
			(inb(ESDI_STATUS) & STATUS_BUSY); )
		;

#if 0
	printk("%s: i(1)=%ld\n", DEVICE_NAME, jif);
#endif

	/* if device is still busy - then just time out */
	if (inb(ESDI_STATUS) & STATUS_BUSY) {
		printk("%s: ps2esdi_out_cmd timed out (1)\n", DEVICE_NAME);
		return ERROR;
	}			/* timeout ??? */
	/* Set up the attention register in the controller */
	outb(((*cmd_blk) & 0xE0) | 1, ESDI_ATTN);

#if 0
	printk("%s: sending %d words to controller\n", DEVICE_NAME, (((*cmd_blk) >> 14) + 1) << 1);
#endif

	/* one by one send each word out */
	for (i = (((*cmd_blk) >> 14) + 1) << 1; i; i--) {
		status = inb(ESDI_STATUS);
		for (jif = jiffies + ESDI_STAT_TIMEOUT;
		     time_after(jif, jiffies) && (status & STATUS_BUSY) &&
		   (status & STATUS_CMD_INF); status = inb(ESDI_STATUS));
		if ((status & (STATUS_BUSY | STATUS_CMD_INF)) == STATUS_BUSY) {
#if 0
			printk("%s: sending %04X\n", DEVICE_NAME, *cmd_blk);
#endif
			outw(*cmd_blk++, ESDI_CMD_INT);
		} else {
			printk("%s: ps2esdi_out_cmd timed out while sending command (status=%02X)\n",
			       DEVICE_NAME, status);
			return ERROR;
		}
	}			/* send all words out */
	return OK;
}				/* send out the commands */


/* prepare for dma - do all the necessary setup */
static void ps2esdi_prep_dma(char *buffer, u_short length, u_char dma_xmode)
{
	unsigned long flags = claim_dma_lock();

	mca_disable_dma(dma_arb_level);

	mca_set_dma_addr(dma_arb_level, isa_virt_to_bus(buffer));

	mca_set_dma_count(dma_arb_level, length * 512 / 2);

	mca_set_dma_mode(dma_arb_level, dma_xmode);

	mca_enable_dma(dma_arb_level);

	release_dma_lock(flags);

}				/* prepare for dma */



static irqreturn_t ps2esdi_interrupt_handler(int irq, void *dev_id,
				      struct pt_regs *regs)
{
	u_int int_ret_code;

	if (inb(ESDI_STATUS) & STATUS_INTR) {
		int_ret_code = inb(ESDI_INTRPT);
		if (current_int_handler) {
			/* Disable adapter interrupts till processing is finished */
			outb(CTRL_DISABLE_INTR, ESDI_CONTROL);
			current_int_handler(int_ret_code);
		} else
			printk("%s: help ! No interrupt handler.\n", DEVICE_NAME);
	} else {
		return IRQ_NONE;
	}
	return IRQ_HANDLED;
}

static void ps2esdi_initial_reset_int_handler(u_int int_ret_code)
{

	switch (int_ret_code & 0xf) {
	case INT_RESET:
		/*BA */
		printk("%s: initial reset completed.\n", DEVICE_NAME);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		wake_up(&ps2esdi_int);
		break;
	case INT_ATTN_ERROR:
		printk("%s: Attention error. interrupt status : %02X\n", DEVICE_NAME,
		       int_ret_code);
		printk("%s: status: %02x\n", DEVICE_NAME, inb(ESDI_STATUS));
		break;
	default:
		printk("%s: initial reset handler received interrupt: %02X\n",
		       DEVICE_NAME, int_ret_code);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		break;
	}
	outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
}


static void ps2esdi_geometry_int_handler(u_int int_ret_code)
{
	u_int status, drive_num;
	unsigned long rba;
	int i;

	drive_num = int_ret_code >> 5;
	switch (int_ret_code & 0xf) {
	case INT_CMD_COMPLETE:
		for (i = ESDI_TIMEOUT; i && !(inb(ESDI_STATUS) & STATUS_STAT_AVAIL); i--);
		if (!(inb(ESDI_STATUS) & STATUS_STAT_AVAIL)) {
			printk("%s: timeout reading status word\n", DEVICE_NAME);
			outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
			break;
		}
		status = inw(ESDI_STT_INT);
		if ((status & 0x1F) == CMD_GET_DEV_CONFIG) {
#define REPLY_WORDS 5		/* we already read word 0 */
			u_short reply[REPLY_WORDS];

			if (ps2esdi_read_status_words((status >> 8) - 1, REPLY_WORDS, reply)) {
				/*BA */
				printk("%s: Device Configuration Status for drive %u\n",
				       DEVICE_NAME, drive_num);

				printk("%s: Spares/cyls: %u", DEVICE_NAME, reply[0] >> 8);

				printk
				    ("Config bits: %s%s%s%s%s\n",
				     (reply[0] & CONFIG_IS) ? "Invalid Secondary, " : "",
				     ((reply[0] & CONFIG_ZD) && !(reply[0] & CONFIG_IS))
				 ? "Zero Defect, " : "Defects Present, ",
				     (reply[0] & CONFIG_SF) ? "Skewed Format, " : "",
				     (reply[0] & CONFIG_FR) ? "Removable, " : "Non-Removable, ",
				     (reply[0] & CONFIG_RT) ? "No Retries" : "Retries");

				rba = reply[1] | ((unsigned long) reply[2] << 16);
				printk("%s: Number of RBA's: %lu\n", DEVICE_NAME, rba);

				printk("%s: Physical number of cylinders: %u, Sectors/Track: %u, Heads: %u\n",
				       DEVICE_NAME, reply[3], reply[4] >> 8, reply[4] & 0xff);

				if (!ps2esdi_info[drive_num].head) {
					ps2esdi_info[drive_num].head = 64;
					ps2esdi_info[drive_num].sect = 32;
					ps2esdi_info[drive_num].cyl = rba / (64 * 32);
					ps2esdi_info[drive_num].wpcom = 0;
					ps2esdi_info[drive_num].lzone = ps2esdi_info[drive_num].cyl;
					ps2esdi_info[drive_num].ctl = 8;
					if (tp720esdi) {	/* store the retrieved parameters */
						ps2esdi_info[0].head = reply[4] & 0Xff;
						ps2esdi_info[0].sect = reply[4] >> 8;
						ps2esdi_info[0].cyl = reply[3];
						ps2esdi_info[0].wpcom = 0;
						ps2esdi_info[0].lzone = reply[3];
					} else {
						if (!intg_esdi)
							ps2esdi_drives++;
					}
				}
#ifdef OBSOLETE
				if (!ps2esdi_info[drive_num].head) {
					ps2esdi_info[drive_num].head = reply[4] & 0Xff;
					ps2esdi_info[drive_num].sect = reply[4] >> 8;
					ps2esdi_info[drive_num].cyl = reply[3];
					ps2esdi_info[drive_num].wpcom = 0;
					ps2esdi_info[drive_num].lzone = reply[3];
					if (tp720esdi) {	/* store the retrieved parameters */
						ps2esdi_info[0].head = reply[4] & 0Xff;
						ps2esdi_info[0].sect = reply[4] >> 8;
						ps2esdi_info[0].cyl = reply[3];
						ps2esdi_info[0].wpcom = 0;
						ps2esdi_info[0].lzone = reply[3];
					} else {
						ps2esdi_drives++;
					}
				}
#endif

			} else
				printk("%s: failed while getting device config\n", DEVICE_NAME);
#undef REPLY_WORDS
		} else
			printk("%s: command %02X unknown by geometry handler\n",
			       DEVICE_NAME, status & 0x1f);

		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		break;

	case INT_ATTN_ERROR:
		printk("%s: Attention error. interrupt status : %02X\n", DEVICE_NAME,
		       int_ret_code);
		printk("%s: Device not available\n", DEVICE_NAME);
		break;
	case INT_CMD_ECC:
	case INT_CMD_RETRY:
	case INT_CMD_ECC_RETRY:
	case INT_CMD_WARNING:
	case INT_CMD_ABORT:
	case INT_CMD_FAILED:
	case INT_DMA_ERR:
	case INT_CMD_BLK_ERR:
		/*BA */ printk("%s: Whaa. Error occurred...\n", DEVICE_NAME);
		dump_cmd_complete_status(int_ret_code);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		break;
	default:
		printk("%s: Unknown interrupt reason: %02X\n",
		       DEVICE_NAME, int_ret_code & 0xf);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		break;
	}

	wake_up(&ps2esdi_int);
	no_int_yet = FALSE;
	outb(CTRL_ENABLE_INTR, ESDI_CONTROL);

}

static void ps2esdi_normal_interrupt_handler(u_int int_ret_code)
{
	unsigned long flags;
	u_int status;
	u_int ending;
	int i;

	switch (int_ret_code & 0x0f) {
	case INT_TRANSFER_REQ:
		ps2esdi_prep_dma(current_req->buffer,
				 current_req->current_nr_sectors,
		    (rq_data_dir(current_req) == READ)
		    ? MCA_DMA_MODE_16 | MCA_DMA_MODE_WRITE | MCA_DMA_MODE_XFER
		    : MCA_DMA_MODE_16 | MCA_DMA_MODE_READ);
		outb(CTRL_ENABLE_DMA | CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = -1;
		break;

	case INT_ATTN_ERROR:
		printk("%s: Attention error. interrupt status : %02X\n", DEVICE_NAME,
		       int_ret_code);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = FAIL;
		break;

	case INT_CMD_COMPLETE:
		for (i = ESDI_TIMEOUT; i && !(inb(ESDI_STATUS) & STATUS_STAT_AVAIL); i--);
		if (!(inb(ESDI_STATUS) & STATUS_STAT_AVAIL)) {
			printk("%s: timeout reading status word\n", DEVICE_NAME);
			outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
			outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
			if ((++current_req->errors) >= MAX_RETRIES)
				ending = FAIL;
			else
				ending = -1;
			break;
		}
		status = inw(ESDI_STT_INT);
		switch (status & 0x1F) {
		case (CMD_READ & 0xff):
		case (CMD_WRITE & 0xff):
			LITE_OFF;
			outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
			outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
			ending = SUCCES;
			break;
		default:
			printk("%s: interrupt for unknown command %02X\n",
			       DEVICE_NAME, status & 0x1f);
			outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
			outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
			ending = -1;
			break;
		}
		break;
	case INT_CMD_ECC:
	case INT_CMD_RETRY:
	case INT_CMD_ECC_RETRY:
		LITE_OFF;
		dump_cmd_complete_status(int_ret_code);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = SUCCES;
		break;
	case INT_CMD_WARNING:
	case INT_CMD_ABORT:
	case INT_CMD_FAILED:
	case INT_DMA_ERR:
		LITE_OFF;
		dump_cmd_complete_status(int_ret_code);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		if ((++current_req->errors) >= MAX_RETRIES)
			ending = FAIL;
		else
			ending = -1;
		break;

	case INT_CMD_BLK_ERR:
		dump_cmd_complete_status(int_ret_code);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = FAIL;
		break;

	case INT_CMD_FORMAT:
		printk("%s: huh ? Who issued this format command ?\n"
		       ,DEVICE_NAME);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = -1;
		break;

	case INT_RESET:
		/* BA printk("%s: reset completed.\n", DEVICE_NAME) */ ;
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = -1;
		break;

	default:
		printk("%s: Unknown interrupt reason: %02X\n",
		       DEVICE_NAME, int_ret_code & 0xf);
		outb((int_ret_code & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		ending = -1;
		break;
	}
	if(ending != -1) {
		spin_lock_irqsave(&ps2esdi_lock, flags);
		end_request(current_req, ending);
		current_req = NULL;
		do_ps2esdi_request(ps2esdi_queue);
		spin_unlock_irqrestore(&ps2esdi_lock, flags);
	}
}				/* handle interrupts */



static int ps2esdi_read_status_words(int num_words,
				     int max_words,
				     u_short * buffer)
{
	int i;

	for (; max_words && num_words; max_words--, num_words--, buffer++) {
		for (i = ESDI_TIMEOUT; i && !(inb(ESDI_STATUS) & STATUS_STAT_AVAIL); i--);
		if (!(inb(ESDI_STATUS) & STATUS_STAT_AVAIL)) {
			printk("%s: timeout reading status word\n", DEVICE_NAME);
			return FAIL;
		}
		*buffer = inw(ESDI_STT_INT);
	}
	return SUCCES;
}




static void dump_cmd_complete_status(u_int int_ret_code)
{
#define WAIT_FOR_STATUS \
  for(i=ESDI_TIMEOUT;i && !(inb(ESDI_STATUS) & STATUS_STAT_AVAIL);i--); \
    if(!(inb(ESDI_STATUS) & STATUS_STAT_AVAIL)) { \
    printk("%s: timeout reading status word\n",DEVICE_NAME); \
    return; \
    }

	int i, word_count;
	u_short stat_word;
	u_long rba;

	printk("%s: Device: %u, interrupt ID: %02X\n",
	       DEVICE_NAME, int_ret_code >> 5,
	       int_ret_code & 0xf);

	WAIT_FOR_STATUS;
	stat_word = inw(ESDI_STT_INT);
	word_count = (stat_word >> 8) - 1;
	printk("%s: %u status words, command: %02X\n", DEVICE_NAME, word_count,
	       stat_word & 0xff);

	if (word_count--) {
		WAIT_FOR_STATUS;
		stat_word = inw(ESDI_STT_INT);
		printk("%s: command status code: %02X, command error code: %02X\n",
		       DEVICE_NAME, stat_word >> 8, stat_word & 0xff);
	}
	if (word_count--) {
		WAIT_FOR_STATUS;
		stat_word = inw(ESDI_STT_INT);
		printk("%s: device error code: %s%s%s%s%s,%02X\n", DEVICE_NAME,
		       (stat_word & 0x1000) ? "Ready, " : "Not Ready, ",
		  (stat_word & 0x0800) ? "Selected, " : "Not Selected, ",
		       (stat_word & 0x0400) ? "Write Fault, " : "",
		       (stat_word & 0x0200) ? "Track 0, " : "",
		(stat_word & 0x0100) ? "Seek or command complete, " : "",
		       stat_word >> 8);
	}
	if (word_count--) {
		WAIT_FOR_STATUS;
		stat_word = inw(ESDI_STT_INT);
		printk("%s: Blocks to do: %u", DEVICE_NAME, stat_word);
	}
	if (word_count -= 2) {
		WAIT_FOR_STATUS;
		rba = inw(ESDI_STT_INT);
		WAIT_FOR_STATUS;
		rba |= inw(ESDI_STT_INT) << 16;
		printk(", Last Cyl: %u Head: %u Sector: %u\n",
		       (u_short) ((rba & 0x1ff80000) >> 11),
		 (u_short) ((rba & 0x7E0) >> 5), (u_short) (rba & 0x1f));
	} else
		printk("\n");

	if (word_count--) {
		WAIT_FOR_STATUS;
		stat_word = inw(ESDI_STT_INT);
		printk("%s: Blocks required ECC: %u", DEVICE_NAME, stat_word);
	}
	printk("\n");

#undef WAIT_FOR_STATUS

}

static int ps2esdi_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct ps2esdi_i_struct *p = bdev->bd_disk->private_data;

	geo->heads = p->head;
	geo->sectors = p->sect;
	geo->cylinders = p->cyl;
	return 0;
}

static void ps2esdi_reset_timer(unsigned long unused)
{

	int status;

	status = inb(ESDI_INTRPT);
	if ((status & 0xf) == INT_RESET) {
		outb((status & 0xe0) | ATT_EOI, ESDI_ATTN);
		outb(CTRL_ENABLE_INTR, ESDI_CONTROL);
		reset_status = 1;
	}
	wake_up(&ps2esdi_int);
}