ide.h 46.3 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
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
#ifndef _IDE_H
#define _IDE_H
/*
 *  linux/include/linux/ide.h
 *
 *  Copyright (C) 1994-2002  Linus Torvalds & authors
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/hdreg.h>
#include <linux/hdsmart.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/bio.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/semaphore.h>

/*
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
 * There can be up to two drives per interface, as per the ATA-2 spec.
 *
 * Primary i/f:    ide0: major=3;  (hda)         minor=0; (hdb)         minor=64
 * Secondary i/f:  ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
 * Tertiary i/f:   ide2: major=33; (hde)         minor=0; (hdf)         minor=64
 * Quaternary i/f: ide3: major=34; (hdg)         minor=0; (hdh)         minor=64
 */

/******************************************************************************
 * IDE driver configuration options (play with these as desired):
 *
 * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
 */
#define INITIAL_MULT_COUNT	0	/* off=0; on=2,4,8,16,32, etc.. */

#ifndef SUPPORT_SLOW_DATA_PORTS		/* 1 to support slow data ports */
#define SUPPORT_SLOW_DATA_PORTS	1	/* 0 to reduce kernel size */
#endif
#ifndef SUPPORT_VLB_SYNC		/* 1 to support weird 32-bit chips */
#define SUPPORT_VLB_SYNC	1	/* 0 to reduce kernel size */
#endif
#ifndef OK_TO_RESET_CONTROLLER		/* 1 needed for good error recovery */
#define OK_TO_RESET_CONTROLLER	1	/* 0 for use with AH2372A/B interface */
#endif

#ifndef DISABLE_IRQ_NOSYNC
#define DISABLE_IRQ_NOSYNC	0
#endif

/*
 * Used to indicate "no IRQ", should be a value that cannot be an IRQ
 * number.
 */
 
#define IDE_NO_IRQ		(-1)

/*
 *  "No user-serviceable parts" beyond this point  :)
 *****************************************************************************/

typedef unsigned char	byte;	/* used everywhere */

/*
 * Probably not wise to fiddle with these
 */
#define ERROR_MAX	8	/* Max read/write errors per sector */
#define ERROR_RESET	3	/* Reset controller every 4th retry */
#define ERROR_RECAL	1	/* Recalibrate every 2nd retry */

/*
 * Tune flags
 */
#define IDE_TUNE_NOAUTO		2
#define IDE_TUNE_AUTO		1
#define IDE_TUNE_DEFAULT	0

/*
 * state flags
 */

#define DMA_PIO_RETRY	1	/* retrying in PIO */

#define HWIF(drive)		((ide_hwif_t *)((drive)->hwif))
#define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))

/*
 * Definitions for accessing IDE controller registers
 */
#define IDE_NR_PORTS		(10)

#define IDE_DATA_OFFSET		(0)
#define IDE_ERROR_OFFSET	(1)
#define IDE_NSECTOR_OFFSET	(2)
#define IDE_SECTOR_OFFSET	(3)
#define IDE_LCYL_OFFSET		(4)
#define IDE_HCYL_OFFSET		(5)
#define IDE_SELECT_OFFSET	(6)
#define IDE_STATUS_OFFSET	(7)
#define IDE_CONTROL_OFFSET	(8)
#define IDE_IRQ_OFFSET		(9)

#define IDE_FEATURE_OFFSET	IDE_ERROR_OFFSET
#define IDE_COMMAND_OFFSET	IDE_STATUS_OFFSET

#define IDE_CONTROL_OFFSET_HOB	(7)

#define IDE_DATA_REG		(HWIF(drive)->io_ports[IDE_DATA_OFFSET])
#define IDE_ERROR_REG		(HWIF(drive)->io_ports[IDE_ERROR_OFFSET])
#define IDE_NSECTOR_REG		(HWIF(drive)->io_ports[IDE_NSECTOR_OFFSET])
#define IDE_SECTOR_REG		(HWIF(drive)->io_ports[IDE_SECTOR_OFFSET])
#define IDE_LCYL_REG		(HWIF(drive)->io_ports[IDE_LCYL_OFFSET])
#define IDE_HCYL_REG		(HWIF(drive)->io_ports[IDE_HCYL_OFFSET])
#define IDE_SELECT_REG		(HWIF(drive)->io_ports[IDE_SELECT_OFFSET])
#define IDE_STATUS_REG		(HWIF(drive)->io_ports[IDE_STATUS_OFFSET])
#define IDE_CONTROL_REG		(HWIF(drive)->io_ports[IDE_CONTROL_OFFSET])
#define IDE_IRQ_REG		(HWIF(drive)->io_ports[IDE_IRQ_OFFSET])

#define IDE_FEATURE_REG		IDE_ERROR_REG
#define IDE_COMMAND_REG		IDE_STATUS_REG
#define IDE_ALTSTATUS_REG	IDE_CONTROL_REG
#define IDE_IREASON_REG		IDE_NSECTOR_REG
#define IDE_BCOUNTL_REG		IDE_LCYL_REG
#define IDE_BCOUNTH_REG		IDE_HCYL_REG

#define OK_STAT(stat,good,bad)	(((stat)&((good)|(bad)))==(good))
#define BAD_R_STAT		(BUSY_STAT   | ERR_STAT)
#define BAD_W_STAT		(BAD_R_STAT  | WRERR_STAT)
#define BAD_STAT		(BAD_R_STAT  | DRQ_STAT)
#define DRIVE_READY		(READY_STAT  | SEEK_STAT)
#define DATA_READY		(DRQ_STAT)

#define BAD_CRC			(ABRT_ERR    | ICRC_ERR)

#define SATA_NR_PORTS		(3)	/* 16 possible ?? */

#define SATA_STATUS_OFFSET	(0)
#define SATA_STATUS_REG		(HWIF(drive)->sata_scr[SATA_STATUS_OFFSET])
#define SATA_ERROR_OFFSET	(1)
#define SATA_ERROR_REG		(HWIF(drive)->sata_scr[SATA_ERROR_OFFSET])
#define SATA_CONTROL_OFFSET	(2)
#define SATA_CONTROL_REG	(HWIF(drive)->sata_scr[SATA_CONTROL_OFFSET])

#define SATA_MISC_OFFSET	(0)
#define SATA_MISC_REG		(HWIF(drive)->sata_misc[SATA_MISC_OFFSET])
#define SATA_PHY_OFFSET		(1)
#define SATA_PHY_REG		(HWIF(drive)->sata_misc[SATA_PHY_OFFSET])
#define SATA_IEN_OFFSET		(2)
#define SATA_IEN_REG		(HWIF(drive)->sata_misc[SATA_IEN_OFFSET])

/*
 * Our Physical Region Descriptor (PRD) table should be large enough
 * to handle the biggest I/O request we are likely to see.  Since requests
 * can have no more than 256 sectors, and since the typical blocksize is
 * two or more sectors, we could get by with a limit of 128 entries here for
 * the usual worst case.  Most requests seem to include some contiguous blocks,
 * further reducing the number of table entries required.
 *
 * The driver reverts to PIO mode for individual requests that exceed
 * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
 * 100% of all crazy scenarios here is not necessary.
 *
 * As it turns out though, we must allocate a full 4KB page for this,
 * so the two PRD tables (ide0 & ide1) will each get half of that,
 * allowing each to have about 256 entries (8 bytes each) from this.
 */
#define PRD_BYTES       8
#define PRD_ENTRIES	256

/*
 * Some more useful definitions
 */
#define PARTN_BITS	6	/* number of minor dev bits for partitions */
#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
#define SECTOR_SIZE	512
#define SECTOR_WORDS	(SECTOR_SIZE / 4)	/* number of 32bit words per sector */
#define IDE_LARGE_SEEK(b1,b2,t)	(((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))

/*
 * Timeouts for various operations:
 */
#define WAIT_DRQ	(HZ/10)		/* 100msec - spec allows up to 20ms */
#define WAIT_READY	(5*HZ)		/* 5sec - some laptops are very slow */
#define WAIT_PIDENTIFY	(10*HZ)	/* 10sec  - should be less than 3ms (?), if all ATAPI CD is closed at boot */
#define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
#define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
#define WAIT_MIN_SLEEP	(2*HZ/100)	/* 20msec - minimum sleep time */

#define HOST(hwif,chipset)					\
{								\
	return ((hwif)->chipset == chipset) ? 1 : 0;		\
}

/*
 * Check for an interrupt and acknowledge the interrupt status
 */
struct hwif_s;
typedef int (ide_ack_intr_t)(struct hwif_s *);

#ifndef NO_DMA
#define NO_DMA  255
#endif

/*
 * hwif_chipset_t is used to keep track of the specific hardware
 * chipset used by each IDE interface, if known.
 */
typedef enum {	ide_unknown,	ide_generic,	ide_pci,
		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
		ide_qd65xx,	ide_umc8672,	ide_ht6560b,
		ide_rz1000,	ide_trm290,
		ide_cmd646,	ide_cy82c693,	ide_4drives,
		ide_pmac,	ide_etrax100,	ide_acorn,
		ide_forced
} hwif_chipset_t;

/*
 * Structure to hold all information about the location of this port
 */
typedef struct hw_regs_s {
	unsigned long	io_ports[IDE_NR_PORTS];	/* task file registers */
	int		irq;			/* our irq number */
	int		dma;			/* our dma entry */
	ide_ack_intr_t	*ack_intr;		/* acknowledge interrupt */
	hwif_chipset_t  chipset;
} hw_regs_t;

/*
 * Register new hardware with ide
 */
int ide_register_hw(hw_regs_t *hw, struct hwif_s **hwifp);
int ide_register_hw_with_fixup(hw_regs_t *, struct hwif_s **, void (*)(struct hwif_s *));

/*
 * Set up hw_regs_t structure before calling ide_register_hw (optional)
 */
void ide_setup_ports(	hw_regs_t *hw,
			unsigned long base,
			int *offsets,
			unsigned long ctrl,
			unsigned long intr,
			ide_ack_intr_t *ack_intr,
#if 0
			ide_io_ops_t *iops,
#endif
			int irq);

static inline void ide_std_init_ports(hw_regs_t *hw,
				      unsigned long io_addr,
				      unsigned long ctl_addr)
{
	unsigned int i;

	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
		hw->io_ports[i] = io_addr++;

	hw->io_ports[IDE_CONTROL_OFFSET] = ctl_addr;
}

#include <asm/ide.h>

/* needed on alpha, x86/x86_64, ia64, mips, ppc32 and sh */
#ifndef IDE_ARCH_OBSOLETE_DEFAULTS
# define ide_default_io_base(index)	(0)
# define ide_default_irq(base)		(0)
# define ide_init_default_irq(base)	(0)
#endif

/*
 * ide_init_hwif_ports() is OBSOLETE and will be removed in 2.7 series.
 * New ports shouldn't define IDE_ARCH_OBSOLETE_INIT in <asm/ide.h>.
 */
#ifdef IDE_ARCH_OBSOLETE_INIT
static inline void ide_init_hwif_ports(hw_regs_t *hw,
				       unsigned long io_addr,
				       unsigned long ctl_addr,
				       int *irq)
{
	if (!ctl_addr)
		ide_std_init_ports(hw, io_addr, ide_default_io_ctl(io_addr));
	else
		ide_std_init_ports(hw, io_addr, ctl_addr);

	if (irq)
		*irq = 0;

	hw->io_ports[IDE_IRQ_OFFSET] = 0;

#ifdef CONFIG_PPC32
	if (ppc_ide_md.ide_init_hwif)
		ppc_ide_md.ide_init_hwif(hw, io_addr, ctl_addr, irq);
#endif
}
#else
static inline void ide_init_hwif_ports(hw_regs_t *hw,
				       unsigned long io_addr,
				       unsigned long ctl_addr,
				       int *irq)
{
	if (io_addr || ctl_addr)
		printk(KERN_WARNING "%s: must not be called\n", __FUNCTION__);
}
#endif /* IDE_ARCH_OBSOLETE_INIT */

/* Currently only m68k, apus and m8xx need it */
#ifndef IDE_ARCH_ACK_INTR
# define ide_ack_intr(hwif) (1)
#endif

/* Currently only Atari needs it */
#ifndef IDE_ARCH_LOCK
# define ide_release_lock()			do {} while (0)
# define ide_get_lock(hdlr, data)		do {} while (0)
#endif /* IDE_ARCH_LOCK */

/*
 * Now for the data we need to maintain per-drive:  ide_drive_t
 */

#define ide_scsi	0x21
#define ide_disk	0x20
#define ide_optical	0x7
#define ide_cdrom	0x5
#define ide_tape	0x1
#define ide_floppy	0x0

/*
 * Special Driver Flags
 *
 * set_geometry	: respecify drive geometry
 * recalibrate	: seek to cyl 0
 * set_multmode	: set multmode count
 * set_tune	: tune interface for drive
 * serviced	: service command
 * reserved	: unused
 */
typedef union {
	unsigned all			: 8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned set_geometry	: 1;
		unsigned recalibrate	: 1;
		unsigned set_multmode	: 1;
		unsigned set_tune	: 1;
		unsigned serviced	: 1;
		unsigned reserved	: 3;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned reserved	: 3;
		unsigned serviced	: 1;
		unsigned set_tune	: 1;
		unsigned set_multmode	: 1;
		unsigned recalibrate	: 1;
		unsigned set_geometry	: 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} special_t;

/*
 * ATA DATA Register Special.
 * ATA NSECTOR Count Register().
 * ATAPI Byte Count Register.
 * Channel index ordering pairs.
 */
typedef union {
	unsigned all			:16;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned low		:8;	/* LSB */
		unsigned high		:8;	/* MSB */
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned high		:8;	/* MSB */
		unsigned low		:8;	/* LSB */
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} ata_nsector_t, ata_data_t, atapi_bcount_t, ata_index_t;

/*
 * ATA-IDE Error Register
 *
 * mark		: Bad address mark
 * tzero	: Couldn't find track 0
 * abrt		: Aborted Command
 * mcr		: Media Change Request
 * id		: ID field not found
 * mce		: Media Change Event
 * ecc		: Uncorrectable ECC error
 * bdd		: dual meaing
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned mark		:1;
		unsigned tzero		:1;
		unsigned abrt		:1;
		unsigned mcr		:1;
		unsigned id		:1;
		unsigned mce		:1;
		unsigned ecc		:1;
		unsigned bdd		:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned bdd		:1;
		unsigned ecc		:1;
		unsigned mce		:1;
		unsigned id		:1;
		unsigned mcr		:1;
		unsigned abrt		:1;
		unsigned tzero		:1;
		unsigned mark		:1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} ata_error_t;

/*
 * ATA-IDE Select Register, aka Device-Head
 *
 * head		: always zeros here
 * unit		: drive select number: 0/1
 * bit5		: always 1
 * lba		: using LBA instead of CHS
 * bit7		: always 1
 */
typedef union {
	unsigned all			: 8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned head		: 4;
		unsigned unit		: 1;
		unsigned bit5		: 1;
		unsigned lba		: 1;
		unsigned bit7		: 1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned bit7		: 1;
		unsigned lba		: 1;
		unsigned bit5		: 1;
		unsigned unit		: 1;
		unsigned head		: 4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} select_t, ata_select_t;

/*
 * The ATA-IDE Status Register.
 * The ATAPI Status Register.
 *
 * check	: Error occurred
 * idx		: Index Error
 * corr		: Correctable error occurred
 * drq		: Data is request by the device
 * dsc		: Disk Seek Complete			: ata
 *		: Media access command finished		: atapi
 * df		: Device Fault				: ata
 *		: Reserved				: atapi
 * drdy		: Ready, Command Mode Capable		: ata
 *		: Ignored for ATAPI commands		: atapi
 * bsy		: Disk is Busy
 *		: The device has access to the command block
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned check		:1;
		unsigned idx		:1;
		unsigned corr		:1;
		unsigned drq		:1;
		unsigned dsc		:1;
		unsigned df		:1;
		unsigned drdy		:1;
		unsigned bsy		:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned bsy		:1;
		unsigned drdy		:1;
		unsigned df		:1;
		unsigned dsc		:1;
		unsigned drq		:1;
		unsigned corr           :1;
		unsigned idx		:1;
		unsigned check		:1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} ata_status_t, atapi_status_t;

/*
 * ATA-IDE Control Register
 *
 * bit0		: Should be set to zero
 * nIEN		: device INTRQ to host
 * SRST		: host soft reset bit
 * bit3		: ATA-2 thingy, Should be set to 1
 * reserved456	: Reserved
 * HOB		: 48-bit address ordering, High Ordered Bit
 */
typedef union {
	unsigned all			: 8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned bit0		: 1;
		unsigned nIEN		: 1;
		unsigned SRST		: 1;
		unsigned bit3		: 1;
		unsigned reserved456	: 3;
		unsigned HOB		: 1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned HOB		: 1;
		unsigned reserved456	: 3;
		unsigned bit3		: 1;
		unsigned SRST		: 1;
		unsigned nIEN		: 1;
		unsigned bit0		: 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} ata_control_t;

/*
 * ATAPI Feature Register
 *
 * dma		: Using DMA or PIO
 * reserved321	: Reserved
 * reserved654	: Reserved (Tag Type)
 * reserved7	: Reserved
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned dma		:1;
		unsigned reserved321	:3;
		unsigned reserved654	:3;
		unsigned reserved7	:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned reserved7	:1;
		unsigned reserved654	:3;
		unsigned reserved321	:3;
		unsigned dma		:1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} atapi_feature_t;

/*
 * ATAPI Interrupt Reason Register.
 *
 * cod		: Information transferred is command (1) or data (0)
 * io		: The device requests us to read (1) or write (0)
 * reserved	: Reserved
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned cod		:1;
		unsigned io		:1;
		unsigned reserved	:6;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned reserved	:6;
		unsigned io		:1;
		unsigned cod		:1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} atapi_ireason_t;

/*
 * The ATAPI error register.
 *
 * ili		: Illegal Length Indication
 * eom		: End Of Media Detected
 * abrt		: Aborted command - As defined by ATA
 * mcr		: Media Change Requested - As defined by ATA
 * sense_key	: Sense key of the last failed packet command
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned ili		:1;
		unsigned eom		:1;
		unsigned abrt		:1;
		unsigned mcr		:1;
		unsigned sense_key	:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned sense_key	:4;
		unsigned mcr		:1;
		unsigned abrt		:1;
		unsigned eom		:1;
		unsigned ili		:1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} atapi_error_t;

/*
 * ATAPI floppy Drive Select Register
 *
 * sam_lun	: Logical unit number
 * reserved3	: Reserved
 * drv		: The responding drive will be drive 0 (0) or drive 1 (1)
 * one5		: Should be set to 1
 * reserved6	: Reserved
 * one7		: Should be set to 1
 */
typedef union {
	unsigned all			:8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned sam_lun	:3;
		unsigned reserved3	:1;
		unsigned drv		:1;
		unsigned one5		:1;
		unsigned reserved6	:1;
		unsigned one7		:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned one7		:1;
		unsigned reserved6	:1;
		unsigned one5		:1;
		unsigned drv		:1;
		unsigned reserved3	:1;
		unsigned sam_lun	:3;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} atapi_select_t;

/*
 * Status returned from various ide_ functions
 */
typedef enum {
	ide_stopped,	/* no drive operation was started */
	ide_started,	/* a drive operation was started, handler was set */
} ide_startstop_t;

struct ide_driver_s;
struct ide_settings_s;

typedef struct ide_drive_s {
	char		name[4];	/* drive name, such as "hda" */
        char            driver_req[10];	/* requests specific driver */

	request_queue_t		*queue;	/* request queue */

	struct request		*rq;	/* current request */
	struct ide_drive_s 	*next;	/* circular list of hwgroup drives */
	void		*driver_data;	/* extra driver data */
	struct hd_driveid	*id;	/* drive model identification info */
	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */
	struct ide_settings_s *settings;/* /proc/ide/ drive settings */
	char		devfs_name[64];	/* devfs crap */

	struct hwif_s		*hwif;	/* actually (ide_hwif_t *) */

	unsigned long sleep;		/* sleep until this time */
	unsigned long service_start;	/* time we started last request */
	unsigned long service_time;	/* service time of last request */
	unsigned long timeout;		/* max time to wait for irq */

	special_t	special;	/* special action flags */
	select_t	select;		/* basic drive/head select reg value */

	u8	keep_settings;		/* restore settings after drive reset */
	u8	autodma;		/* device can safely use dma on host */
	u8	using_dma;		/* disk is using dma for read/write */
	u8	retry_pio;		/* retrying dma capable host in pio */
	u8	state;			/* retry state */
	u8	waiting_for_dma;	/* dma currently in progress */
	u8	unmask;			/* okay to unmask other irqs */
	u8	bswap;			/* byte swap data */
	u8	dsc_overlap;		/* DSC overlap */
	u8	nice1;			/* give potential excess bandwidth */

	unsigned present	: 1;	/* drive is physically present */
	unsigned dead		: 1;	/* device ejected hint */
	unsigned id_read	: 1;	/* 1=id read from disk 0 = synthetic */
	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
	unsigned removable	: 1;	/* 1 if need to do check_media_change */
	unsigned attach		: 1;	/* needed for removable devices */
	unsigned is_flash	: 1;	/* 1 if probed as flash */
	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
	unsigned no_unmask	: 1;	/* disallow setting unmask bit */
	unsigned no_io_32bit	: 1;	/* disallow enabling 32bit I/O */
	unsigned atapi_overlap	: 1;	/* ATAPI overlap (not supported) */
	unsigned nice0		: 1;	/* give obvious excess bandwidth */
	unsigned nice2		: 1;	/* give a share in our own bandwidth */
	unsigned doorlocking	: 1;	/* for removable only: door lock/unlock works */
	unsigned autotune	: 2;	/* 0=default, 1=autotune, 2=noautotune */
	unsigned remap_0_to_1	: 1;	/* 0=noremap, 1=remap 0->1 (for EZDrive) */
	unsigned blocked        : 1;	/* 1=powermanagment told us not to do anything, so sleep nicely */
	unsigned vdma		: 1;	/* 1=doing PIO over DMA 0=doing normal DMA */
	unsigned addressing;		/*      : 3;
					 *  0=28-bit
					 *  1=48-bit
					 *  2=48-bit doing 28-bit
					 *  3=64-bit
					 */
	unsigned scsi		: 1;	/* 0=default, 1=ide-scsi emulation */
	unsigned sleeping	: 1;	/* 1=sleeping & sleep field valid */
	unsigned post_reset	: 1;

        u8	quirk_list;	/* considered quirky, set for a specific host */
        u8	init_speed;	/* transfer rate set at boot */
        u8	pio_speed;      /* unused by core, used by some drivers for fallback from DMA */
        u8	current_speed;	/* current transfer rate set */
        u8	dn;		/* now wide spread use */
        u8	wcache;		/* status of write cache */
	u8	acoustic;	/* acoustic management */
	u8	media;		/* disk, cdrom, tape, floppy, ... */
	u8	ctl;		/* "normal" value for IDE_CONTROL_REG */
	u8	ready_stat;	/* min status value for drive ready */
	u8	mult_count;	/* current multiple sector setting */
	u8	mult_req;	/* requested multiple sector setting */
	u8	tune_req;	/* requested drive tuning setting */
	u8	io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
	u8	bad_wstat;	/* used for ignoring WRERR_STAT */
	u8	nowerr;		/* used for ignoring WRERR_STAT */
	u8	sect0;		/* offset of first sector for DM6:DDO */
	u8	head;		/* "real" number of heads */
	u8	sect;		/* "real" sectors per track */
	u8	bios_head;	/* BIOS/fdisk/LILO number of heads */
	u8	bios_sect;	/* BIOS/fdisk/LILO sectors per track */

	unsigned int	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
	unsigned int	cyl;		/* "real" number of cyls */
	unsigned int	drive_data;	/* use by tuneproc/selectproc */
	unsigned int	usage;		/* current "open()" count for drive */
	unsigned int	failures;	/* current failure count */
	unsigned int	max_failures;	/* maximum allowed failure count */

	u64		capacity64;	/* total number of sectors */

	int		lun;		/* logical unit */
	int		crc_count;	/* crc counter to reduce drive speed */
	struct list_head list;
	struct device	gendev;
	struct semaphore gendev_rel_sem;	/* to deal with device release() */
} ide_drive_t;

760
761
#define to_ide_device(dev)container_of(dev, ide_drive_t, gendev)

Linus Torvalds's avatar
Linus Torvalds committed
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
#define IDE_CHIPSET_PCI_MASK	\
    ((1<<ide_pci)|(1<<ide_cmd646)|(1<<ide_ali14xx))
#define IDE_CHIPSET_IS_PCI(c)	((IDE_CHIPSET_PCI_MASK >> (c)) & 1)

struct ide_pci_device_s;

typedef struct hwif_s {
	struct hwif_s *next;		/* for linked-list in ide_hwgroup_t */
	struct hwif_s *mate;		/* other hwif from same PCI chip */
	struct hwgroup_s *hwgroup;	/* actually (ide_hwgroup_t *) */
	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */

	char name[6];			/* name of interface, eg. "ide0" */

		/* task file registers for pata and sata */
	unsigned long	io_ports[IDE_NR_PORTS];
	unsigned long	sata_scr[SATA_NR_PORTS];
	unsigned long	sata_misc[SATA_NR_PORTS];

	hw_regs_t	hw;		/* Hardware info */
	ide_drive_t	drives[MAX_DRIVES];	/* drive info */

	u8 major;	/* our major number */
	u8 index;	/* 0 for ide0; 1 for ide1; ... */
	u8 channel;	/* for dual-port chips: 0=primary, 1=secondary */
	u8 straight8;	/* Alan's straight 8 check */
	u8 bus_state;	/* power state of the IDE bus */

	u8 atapi_dma;	/* host supports atapi_dma */
	u8 ultra_mask;
	u8 mwdma_mask;
	u8 swdma_mask;

	hwif_chipset_t chipset;	/* sub-module for tuning.. */

	struct pci_dev  *pci_dev;	/* for pci chipsets */
	struct ide_pci_device_s	*cds;	/* chipset device struct */

	void (*rw_disk)(ide_drive_t *, struct request *);

#if 0
	ide_hwif_ops_t	*hwifops;
#else
	/* routine to tune PIO mode for drives */
	void	(*tuneproc)(ide_drive_t *, u8);
	/* routine to retune DMA modes for drives */
	int	(*speedproc)(ide_drive_t *, u8);
	/* tweaks hardware to select drive */
	void	(*selectproc)(ide_drive_t *);
	/* chipset polling based on hba specifics */
	int	(*reset_poll)(ide_drive_t *);
	/* chipset specific changes to default for device-hba resets */
	void	(*pre_reset)(ide_drive_t *);
	/* routine to reset controller after a disk reset */
	void	(*resetproc)(ide_drive_t *);
	/* special interrupt handling for shared pci interrupts */
	void	(*intrproc)(ide_drive_t *);
	/* special host masking for drive selection */
	void	(*maskproc)(ide_drive_t *, int);
	/* check host's drive quirk list */
	int	(*quirkproc)(ide_drive_t *);
	/* driver soft-power interface */
	int	(*busproc)(ide_drive_t *, int);
//	/* host rate limiter */
//	u8	(*ratemask)(ide_drive_t *);
//	/* device rate limiter */
//	u8	(*ratefilter)(ide_drive_t *, u8);
#endif

	void (*ata_input_data)(ide_drive_t *, void *, u32);
	void (*ata_output_data)(ide_drive_t *, void *, u32);

	void (*atapi_input_bytes)(ide_drive_t *, void *, u32);
	void (*atapi_output_bytes)(ide_drive_t *, void *, u32);

	int (*dma_setup)(ide_drive_t *);
	void (*dma_exec_cmd)(ide_drive_t *, u8);
	void (*dma_start)(ide_drive_t *);
	int (*ide_dma_end)(ide_drive_t *drive);
	int (*ide_dma_check)(ide_drive_t *drive);
	int (*ide_dma_on)(ide_drive_t *drive);
	int (*ide_dma_off_quietly)(ide_drive_t *drive);
	int (*ide_dma_test_irq)(ide_drive_t *drive);
	int (*ide_dma_host_on)(ide_drive_t *drive);
	int (*ide_dma_host_off)(ide_drive_t *drive);
	int (*ide_dma_lostirq)(ide_drive_t *drive);
	int (*ide_dma_timeout)(ide_drive_t *drive);

	void (*OUTB)(u8 addr, unsigned long port);
	void (*OUTBSYNC)(ide_drive_t *drive, u8 addr, unsigned long port);
	void (*OUTW)(u16 addr, unsigned long port);
	void (*OUTL)(u32 addr, unsigned long port);
	void (*OUTSW)(unsigned long port, void *addr, u32 count);
	void (*OUTSL)(unsigned long port, void *addr, u32 count);

	u8  (*INB)(unsigned long port);
	u16 (*INW)(unsigned long port);
	u32 (*INL)(unsigned long port);
	void (*INSW)(unsigned long port, void *addr, u32 count);
	void (*INSL)(unsigned long port, void *addr, u32 count);

	/* dma physical region descriptor table (cpu view) */
	unsigned int	*dmatable_cpu;
	/* dma physical region descriptor table (dma view) */
	dma_addr_t	dmatable_dma;
	/* Scatter-gather list used to build the above */
	struct scatterlist *sg_table;
	int sg_max_nents;		/* Maximum number of entries in it */
	int sg_nents;			/* Current number of entries in it */
	int sg_dma_direction;		/* dma transfer direction */

	/* data phase of the active command (currently only valid for PIO/DMA) */
	int		data_phase;

	unsigned int nsect;
	unsigned int nleft;
	unsigned int cursg;
	unsigned int cursg_ofs;

	int		mmio;		/* hosts iomio (0) or custom (2) select */
	int		rqsize;		/* max sectors per request */
	int		irq;		/* our irq number */

	unsigned long	dma_master;	/* reference base addr dmabase */
	unsigned long	dma_base;	/* base addr for dma ports */
	unsigned long	dma_command;	/* dma command register */
	unsigned long	dma_vendor1;	/* dma vendor 1 register */
	unsigned long	dma_status;	/* dma status register */
	unsigned long	dma_vendor3;	/* dma vendor 3 register */
	unsigned long	dma_prdtable;	/* actual prd table address */
	unsigned long	dma_base2;	/* extended base addr for dma ports */

	unsigned	dma_extra;	/* extra addr for dma ports */
	unsigned long	config_data;	/* for use by chipset-specific code */
	unsigned long	select_data;	/* for use by chipset-specific code */

	unsigned	noprobe    : 1;	/* don't probe for this interface */
	unsigned	present    : 1;	/* this interface exists */
	unsigned	hold       : 1; /* this interface is always present */
	unsigned	serialized : 1;	/* serialized all channel operation */
	unsigned	sharing_irq: 1;	/* 1 = sharing irq with another hwif */
	unsigned	reset      : 1;	/* reset after probe */
	unsigned	autodma    : 1;	/* auto-attempt using DMA at boot */
	unsigned	udma_four  : 1;	/* 1=ATA-66 capable, 0=default */
	unsigned	no_lba48   : 1; /* 1 = cannot do LBA48 */
	unsigned	no_lba48_dma : 1; /* 1 = cannot do LBA48 DMA */
	unsigned	no_dsc     : 1;	/* 0 default, 1 dsc_overlap disabled */
	unsigned	auto_poll  : 1; /* supports nop auto-poll */
	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */

	struct device	gendev;
	struct semaphore gendev_rel_sem; /* To deal with device release() */

	void		*hwif_data;	/* extra hwif data */

	unsigned dma;

	void (*led_act)(void *data, int rw);
920
} ____cacheline_maxaligned_in_smp ide_hwif_t;
Linus Torvalds's avatar
Linus Torvalds committed
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

/*
 *  internal ide interrupt handler type
 */
typedef ide_startstop_t (ide_pre_handler_t)(ide_drive_t *, struct request *);
typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
typedef int (ide_expiry_t)(ide_drive_t *);

typedef struct hwgroup_s {
		/* irq handler, if active */
	ide_startstop_t	(*handler)(ide_drive_t *);
		/* irq handler, suspended if active */
	ide_startstop_t	(*handler_save)(ide_drive_t *);
		/* BOOL: protects all fields below */
	volatile int busy;
		/* BOOL: wake us up on timer expiry */
	unsigned int sleeping	: 1;
		/* BOOL: polling active & poll_timeout field valid */
	unsigned int polling	: 1;
		/* current drive */
	ide_drive_t *drive;
		/* ptr to current hwif in linked-list */
	ide_hwif_t *hwif;

		/* for pci chipsets */
	struct pci_dev *pci_dev;
		/* chipset device struct */
	struct ide_pci_device_s *cds;

		/* current request */
	struct request *rq;
		/* failsafe timer */
	struct timer_list timer;
		/* local copy of current write rq */
	struct request wrq;
		/* timeout value during long polls */
	unsigned long poll_timeout;
		/* queried upon timeouts */
	int (*expiry)(ide_drive_t *);
		/* ide_system_bus_speed */
	int pio_clock;

	unsigned char cmd_buf[4];
} ide_hwgroup_t;

/* structure attached to the request for IDE_TASK_CMDS */

/*
 * configurable drive settings
 */

#define TYPE_INT	0
#define TYPE_INTA	1
#define TYPE_BYTE	2
#define TYPE_SHORT	3

#define SETTING_READ	(1 << 0)
#define SETTING_WRITE	(1 << 1)
#define SETTING_RW	(SETTING_READ | SETTING_WRITE)

typedef int (ide_procset_t)(ide_drive_t *, int);
typedef struct ide_settings_s {
	char			*name;
	int			rw;
	int			read_ioctl;
	int			write_ioctl;
	int			data_type;
	int			min;
	int			max;
	int			mul_factor;
	int			div_factor;
	void			*data;
	ide_procset_t		*set;
	int			auto_remove;
	struct ide_settings_s	*next;
} ide_settings_t;

extern struct semaphore ide_setting_sem;
extern int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set);
extern ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name);