Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
/*
 *  Copyright 2003-2005 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2005 Jeff Garzik
 *
 *
 *  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, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 */

#ifndef __LINUX_LIBATA_H__
#define __LINUX_LIBATA_H__

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>

/*
 * compile-time options
 */
#undef ATA_DEBUG		/* debugging output */
#undef ATA_VERBOSE_DEBUG	/* yet more debugging output */
#undef ATA_IRQ_TRAP		/* define to ack screaming irqs */
#undef ATA_NDEBUG		/* define to disable quick runtime checks */
#undef ATA_ENABLE_PATA		/* define to enable PATA support in some
				 * low-level drivers */
#undef ATAPI_ENABLE_DMADIR	/* enables ATAPI DMADIR bridge support */


/* note: prints function name for you */
#ifdef ATA_DEBUG
#define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
#ifdef ATA_VERBOSE_DEBUG
#define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
#else
#define VPRINTK(fmt, args...)
#endif	/* ATA_VERBOSE_DEBUG */
#else
#define DPRINTK(fmt, args...)
#define VPRINTK(fmt, args...)
#endif	/* ATA_DEBUG */

#define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)

#ifdef ATA_NDEBUG
#define assert(expr)
#else
#define assert(expr) \
        if(unlikely(!(expr))) {                                   \
        printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
        #expr,__FILE__,__FUNCTION__,__LINE__);          \
        }
#endif

/* defines only for the constants which don't work well as enums */
#define ATA_TAG_POISON		0xfafbfcfdU

/* move to PCI layer? */
static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
{
	return &pdev->dev;
}

enum {
	/* various global constants */
	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
	ATA_MAX_PORTS		= 8,
	ATA_DEF_QUEUE		= 1,
	ATA_MAX_QUEUE		= 1,
	ATA_MAX_SECTORS		= 200,	/* FIXME */
	ATA_MAX_BUS		= 2,
	ATA_DEF_BUSY_WAIT	= 10000,
	ATA_SHORT_PAUSE		= (HZ >> 6) + 1,

	ATA_SHT_EMULATED	= 1,
	ATA_SHT_CMD_PER_LUN	= 1,
	ATA_SHT_THIS_ID		= -1,
	ATA_SHT_USE_CLUSTERING	= 1,

	/* struct ata_device stuff */
	ATA_DFLAG_LBA48		= (1 << 0), /* device supports LBA48 */
	ATA_DFLAG_PIO		= (1 << 1), /* device currently in PIO mode */
	ATA_DFLAG_LOCK_SECTORS	= (1 << 2), /* don't adjust max_sectors */
	ATA_DFLAG_LBA		= (1 << 3), /* device supports LBA */

	ATA_DEV_UNKNOWN		= 0,	/* unknown device */
	ATA_DEV_ATA		= 1,	/* ATA device */
	ATA_DEV_ATA_UNSUP	= 2,	/* ATA device (unsupported) */
	ATA_DEV_ATAPI		= 3,	/* ATAPI device */
	ATA_DEV_ATAPI_UNSUP	= 4,	/* ATAPI device (unsupported) */
	ATA_DEV_NONE		= 5,	/* no device */

	/* struct ata_port flags */
	ATA_FLAG_SLAVE_POSS	= (1 << 1), /* host supports slave dev */
					    /* (doesn't imply presence) */
	ATA_FLAG_PORT_DISABLED	= (1 << 2), /* port is disabled, ignore it */
	ATA_FLAG_SATA		= (1 << 3),
	ATA_FLAG_NO_LEGACY	= (1 << 4), /* no legacy mode check */
	ATA_FLAG_SRST		= (1 << 5), /* use ATA SRST, not E.D.D. */
	ATA_FLAG_MMIO		= (1 << 6), /* use MMIO, not PIO */
	ATA_FLAG_SATA_RESET	= (1 << 7), /* use COMRESET */
	ATA_FLAG_PIO_DMA	= (1 << 8), /* PIO cmds via DMA */
	ATA_FLAG_NOINTR		= (1 << 9), /* FIXME: Remove this once
					     * proper HSM is in place. */
	ATA_FLAG_DEBUGMSG	= (1 << 10),

	ATA_QCFLAG_ACTIVE	= (1 << 1), /* cmd not yet ack'd to scsi lyer */
	ATA_QCFLAG_SG		= (1 << 3), /* have s/g table? */
	ATA_QCFLAG_SINGLE	= (1 << 4), /* no s/g, just a single buffer */
	ATA_QCFLAG_DMAMAP	= ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,

	/* various lengths of time */
	ATA_TMOUT_EDD		= 5 * HZ,	/* hueristic */
	ATA_TMOUT_PIO		= 30 * HZ,
	ATA_TMOUT_BOOT		= 30 * HZ,	/* hueristic */
	ATA_TMOUT_BOOT_QUICK	= 7 * HZ,	/* hueristic */
	ATA_TMOUT_CDB		= 30 * HZ,
	ATA_TMOUT_CDB_QUICK	= 5 * HZ,

	/* ATA bus states */
	BUS_UNKNOWN		= 0,
	BUS_DMA			= 1,
	BUS_IDLE		= 2,
	BUS_NOINTR		= 3,
	BUS_NODATA		= 4,
	BUS_TIMER		= 5,
	BUS_PIO			= 6,
	BUS_EDD			= 7,
	BUS_IDENTIFY		= 8,
	BUS_PACKET		= 9,

	/* SATA port states */
	PORT_UNKNOWN		= 0,
	PORT_ENABLED		= 1,
	PORT_DISABLED		= 2,

	/* encoding various smaller bitmaps into a single
	 * unsigned long bitmap
	 */
	ATA_SHIFT_UDMA		= 0,
	ATA_SHIFT_MWDMA		= 8,
	ATA_SHIFT_PIO		= 11,

	/* size of buffer to pad xfers ending on unaligned boundaries */
	ATA_DMA_PAD_SZ		= 4,
	ATA_DMA_PAD_BUF_SZ	= ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
	
	/* Masks for port functions */
	ATA_PORT_PRIMARY	= (1 << 0),
	ATA_PORT_SECONDARY	= (1 << 1),
};

enum hsm_task_states {
	HSM_ST_UNKNOWN,
	HSM_ST_IDLE,
	HSM_ST_POLL,
	HSM_ST_TMOUT,
	HSM_ST,
	HSM_ST_LAST,
	HSM_ST_LAST_POLL,
	HSM_ST_ERR,
};

enum ata_completion_errors {
	AC_ERR_OTHER		= (1 << 0),
	AC_ERR_DEV		= (1 << 1),
	AC_ERR_ATA_BUS		= (1 << 2),
	AC_ERR_HOST_BUS		= (1 << 3),
};

/* forward declarations */
struct scsi_device;
struct ata_port_operations;
struct ata_port;
struct ata_queued_cmd;

/* typedefs */
typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, unsigned int err_mask);

struct ata_ioports {
	unsigned long		cmd_addr;
	unsigned long		data_addr;
	unsigned long		error_addr;
	unsigned long		feature_addr;
	unsigned long		nsect_addr;
	unsigned long		lbal_addr;
	unsigned long		lbam_addr;
	unsigned long		lbah_addr;
	unsigned long		device_addr;
	unsigned long		status_addr;
	unsigned long		command_addr;
	unsigned long		altstatus_addr;
	unsigned long		ctl_addr;
	unsigned long		bmdma_addr;
	unsigned long		scr_addr;
};

struct ata_probe_ent {
	struct list_head	node;
	struct device 		*dev;
	const struct ata_port_operations *port_ops;
	struct scsi_host_template *sht;
	struct ata_ioports	port[ATA_MAX_PORTS];
	unsigned int		n_ports;
	unsigned int		hard_port_no;
	unsigned int		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;
	unsigned int		legacy_mode;
	unsigned long		irq;
	unsigned int		irq_flags;
	unsigned long		host_flags;
	void __iomem		*mmio_base;
	void			*private_data;
};

struct ata_host_set {
	spinlock_t		lock;
	struct device 		*dev;
	unsigned long		irq;
	void __iomem		*mmio_base;
	unsigned int		n_ports;
	void			*private_data;
	const struct ata_port_operations *ops;
	struct ata_port *	ports[0];
};

struct ata_queued_cmd {
	struct ata_port		*ap;
	struct ata_device	*dev;

	struct scsi_cmnd	*scsicmd;
	void			(*scsidone)(struct scsi_cmnd *);

	struct ata_taskfile	tf;
	u8			cdb[ATAPI_CDB_LEN];

	unsigned long		flags;		/* ATA_QCFLAG_xxx */
	unsigned int		tag;
	unsigned int		n_elem;
	unsigned int		orig_n_elem;

	int			dma_dir;

	unsigned int		pad_len;

	unsigned int		nsect;
	unsigned int		cursect;

	unsigned int		nbytes;
	unsigned int		curbytes;

	unsigned int		cursg;
	unsigned int		cursg_ofs;

	struct scatterlist	sgent;
	struct scatterlist	pad_sgent;
	void			*buf_virt;

	/* DO NOT iterate over __sg manually, use ata_for_each_sg() */
	struct scatterlist	*__sg;

	ata_qc_cb_t		complete_fn;

	struct completion	*waiting;

	void			*private_data;
};

struct ata_host_stats {
	unsigned long		unhandled_irq;
	unsigned long		idle_irq;
	unsigned long		rw_reqbuf;
};

struct ata_device {
	u64			n_sectors;	/* size of device, if ATA */
	unsigned long		flags;		/* ATA_DFLAG_xxx */
	unsigned int		class;		/* ATA_DEV_xxx */
	unsigned int		devno;		/* 0 or 1 */
	u16			id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
	u8			pio_mode;
	u8			dma_mode;
	u8			xfer_mode;
	unsigned int		xfer_shift;	/* ATA_SHIFT_xxx */

	unsigned int		multi_count;	/* sectors count for
						   READ/WRITE MULTIPLE */

	/* for CHS addressing */
	u16			cylinders;	/* Number of cylinders */
	u16			heads;		/* Number of heads */
	u16			sectors;	/* Number of sectors per track */
};

struct ata_port {
	struct Scsi_Host	*host;	/* our co-allocated scsi host */
	const struct ata_port_operations *ops;
	unsigned long		flags;	/* ATA_FLAG_xxx */
	unsigned int		id;	/* unique id req'd by scsi midlyr */
	unsigned int		port_no; /* unique port #; from zero */
	unsigned int		hard_port_no;	/* hardware port #; from zero */

	struct ata_prd		*prd;	 /* our SG list */
	dma_addr_t		prd_dma; /* and its DMA mapping */

	void			*pad;	/* array of DMA pad buffers */
	dma_addr_t		pad_dma;

	struct ata_ioports	ioaddr;	/* ATA cmd/ctl/dma register blocks */

	u8			ctl;	/* cache of ATA control register */
	u8			last_ctl;	/* Cache last written value */
	unsigned int		bus_state;
	unsigned int		port_state;
	unsigned int		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;
	unsigned int		cbl;	/* cable type; ATA_CBL_xxx */
	unsigned int		cdb_len;

	struct ata_device	device[ATA_MAX_DEVICES];

	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
	unsigned long		qactive;
	unsigned int		active_tag;

	struct ata_host_stats	stats;
	struct ata_host_set	*host_set;

	struct work_struct	packet_task;

	struct work_struct	pio_task;
	unsigned int		hsm_task_state;
	unsigned long		pio_task_timeout;

	void			*private_data;
};

struct ata_port_operations {
	void (*port_disable) (struct ata_port *);

	void (*dev_config) (struct ata_port *, struct ata_device *);

	void (*set_piomode) (struct ata_port *, struct ata_device *);
	void (*set_dmamode) (struct ata_port *, struct ata_device *);

	void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
	void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);

	void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
	u8   (*check_status)(struct ata_port *ap);
	u8   (*check_altstatus)(struct ata_port *ap);
	void (*dev_select)(struct ata_port *ap, unsigned int device);

	void (*phy_reset) (struct ata_port *ap);
	void (*post_set_mode) (struct ata_port *ap);

	int (*check_atapi_dma) (struct ata_queued_cmd *qc);

	void (*bmdma_setup) (struct ata_queued_cmd *qc);
	void (*bmdma_start) (struct ata_queued_cmd *qc);

	void (*qc_prep) (struct ata_queued_cmd *qc);
	int (*qc_issue) (struct ata_queued_cmd *qc);

	void (*eng_timeout) (struct ata_port *ap);

	irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
	void (*irq_clear) (struct ata_port *);

	u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
	void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
			   u32 val);

	int (*port_start) (struct ata_port *ap);
	void (*port_stop) (struct ata_port *ap);

	void (*host_stop) (struct ata_host_set *host_set);

	void (*bmdma_stop) (struct ata_queued_cmd *qc);
	u8   (*bmdma_status) (struct ata_port *ap);
};

struct ata_port_info {
	struct scsi_host_template	*sht;
	unsigned long		host_flags;
	unsigned long		pio_mask;
	unsigned long		mwdma_mask;
	unsigned long		udma_mask;
	const struct ata_port_operations *port_ops;
	void 			*private_data;
};

struct ata_timing {
	unsigned short mode;		/* ATA mode */
	unsigned short setup;		/* t1 */
	unsigned short act8b;		/* t2 for 8-bit I/O */
	unsigned short rec8b;		/* t2i for 8-bit I/O */
	unsigned short cyc8b;		/* t0 for 8-bit I/O */
	unsigned short active;		/* t2 or tD */
	unsigned short recover;		/* t2i or tK */
	unsigned short cycle;		/* t0 */
	unsigned short udma;		/* t2CYCTYP/2 */
};

#define FIT(v,vmin,vmax)	max_t(short,min_t(short,v,vmax),vmin)

extern void ata_port_probe(struct ata_port *);
extern void __sata_phy_reset(struct ata_port *ap);
extern void sata_phy_reset(struct ata_port *ap);
extern void ata_bus_reset(struct ata_port *ap);
extern void ata_port_disable(struct ata_port *);
extern void ata_std_ports(struct ata_ioports *ioaddr);
#ifdef CONFIG_PCI
extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
			     unsigned int n_ports);
extern void ata_pci_remove_one (struct pci_dev *pdev);
#endif /* CONFIG_PCI */
extern int ata_device_add(const struct ata_probe_ent *ent);
extern void ata_host_set_remove(struct ata_host_set *host_set);
extern int ata_scsi_detect(struct scsi_host_template *sht);
extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
extern int ata_scsi_error(struct Scsi_Host *host);
extern int ata_scsi_release(struct Scsi_Host *host);
extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
extern int ata_ratelimit(void);

/*
 * Default driver ops implementations
 */
extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
extern u8 ata_check_status(struct ata_port *ap);
extern u8 ata_altstatus(struct ata_port *ap);
extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
extern int ata_port_start (struct ata_port *ap);
extern void ata_port_stop (struct ata_port *ap);
extern void ata_host_stop (struct ata_host_set *host_set);
extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
extern void ata_qc_prep(struct ata_queued_cmd *qc);
extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
		unsigned int buflen);
extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem);
extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
extern void ata_dev_id_string(const u16 *id, unsigned char *s,
			      unsigned int ofs, unsigned int len);
extern void ata_dev_config(struct ata_port *ap, unsigned int i);
extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
extern void ata_bmdma_start (struct ata_queued_cmd *qc);
extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
extern u8   ata_bmdma_status(struct ata_port *ap);
extern void ata_bmdma_irq_clear(struct ata_port *ap);
extern void ata_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask);
extern void ata_eng_timeout(struct ata_port *ap);
extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
			      void (*done)(struct scsi_cmnd *));
extern int ata_std_bios_param(struct scsi_device *sdev,
			      struct block_device *bdev,
			      sector_t capacity, int geom[]);
extern int ata_scsi_slave_config(struct scsi_device *sdev);

/*
 * Timing helpers
 */
extern int ata_timing_compute(struct ata_device *, unsigned short,
			      struct ata_timing *, int, int);
extern void ata_timing_merge(const struct ata_timing *,
			     const struct ata_timing *, struct ata_timing *,
			     unsigned int);

enum {
	ATA_TIMING_SETUP	= (1 << 0),
	ATA_TIMING_ACT8B	= (1 << 1),
	ATA_TIMING_REC8B	= (1 << 2),
	ATA_TIMING_CYC8B	= (1 << 3),
	ATA_TIMING_8BIT		= ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
				  ATA_TIMING_CYC8B,
	ATA_TIMING_ACTIVE	= (1 << 4),
	ATA_TIMING_RECOVER	= (1 << 5),
	ATA_TIMING_CYCLE	= (1 << 6),
	ATA_TIMING_UDMA		= (1 << 7),
	ATA_TIMING_ALL		= ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
				  ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
				  ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
				  ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
};


#ifdef CONFIG_PCI
struct pci_bits {
	unsigned int		reg;	/* PCI config register to read */
	unsigned int		width;	/* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
	unsigned long		mask;
	unsigned long		val;
};

extern void ata_pci_host_stop (struct ata_host_set *host_set);
extern struct ata_probe_ent *
ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);

#endif /* CONFIG_PCI */


static inline int
ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
{
	if (sg == &qc->pad_sgent)
		return 1;
	if (qc->pad_len)
		return 0;
	if (((sg - qc->__sg) + 1) == qc->n_elem)
		return 1;
	return 0;
}

static inline struct scatterlist *
ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
{
	if (sg == &qc->pad_sgent)
		return NULL;
	if (++sg - qc->__sg < qc->n_elem)
		return sg;
	return qc->pad_len ? &qc->pad_sgent : NULL;
}

#define ata_for_each_sg(sg, qc) \
	for (sg = qc->__sg; sg; sg = ata_qc_next_sg(sg, qc))

static inline unsigned int ata_tag_valid(unsigned int tag)
{
	return (tag < ATA_MAX_QUEUE) ? 1 : 0;
}

static inline unsigned int ata_dev_present(const struct ata_device *dev)
{
	return ((dev->class == ATA_DEV_ATA) ||
		(dev->class == ATA_DEV_ATAPI));
}

static inline u8 ata_chk_status(struct ata_port *ap)
{
	return ap->ops->check_status(ap);
}


/**
 *	ata_pause - Flush writes and pause 400 nanoseconds.
 *	@ap: Port to wait for.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

static inline void ata_pause(struct ata_port *ap)
{
	ata_altstatus(ap);
	ndelay(400);
}


/**
 *	ata_busy_wait - Wait for a port status register
 *	@ap: Port to wait for.
 *
 *	Waits up to max*10 microseconds for the selected bits in the port's
 *	status register to be cleared.
 *	Returns final value of status register.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
			       unsigned int max)
{
	u8 status;

	do {
		udelay(10);
		status = ata_chk_status(ap);
		max--;
	} while ((status & bits) && (max > 0));

	return status;
}


/**
 *	ata_wait_idle - Wait for a port to be idle.
 *	@ap: Port to wait for.
 *
 *	Waits up to 10ms for port's BUSY and DRQ signals to clear.
 *	Returns final value of status register.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

static inline u8 ata_wait_idle(struct ata_port *ap)
{
	u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);

	if (status & (ATA_BUSY | ATA_DRQ)) {
		unsigned long l = ap->ioaddr.status_addr;
		printk(KERN_WARNING
		       "ATA: abnormal status 0x%X on port 0x%lX\n",
		       status, l);
	}

	return status;
}

static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
{
	qc->tf.ctl |= ATA_NIEN;
}

static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
						      unsigned int tag)
{
	if (likely(ata_tag_valid(tag)))
		return &ap->qcmd[tag];
	return NULL;
}

static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
{
	memset(tf, 0, sizeof(*tf));

	tf->ctl = ap->ctl;
	if (device == 0)
		tf->device = ATA_DEVICE_OBS;
	else
		tf->device = ATA_DEVICE_OBS | ATA_DEV1;
}

static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
{
	qc->__sg = NULL;
	qc->flags = 0;
	qc->cursect = qc->cursg = qc->cursg_ofs = 0;
	qc->nsect = 0;
	qc->nbytes = qc->curbytes = 0;

	ata_tf_init(qc->ap, &qc->tf, qc->dev->devno);
}


/**
 *	ata_irq_on - Enable interrupts on a port.
 *	@ap: Port on which interrupts are enabled.
 *
 *	Enable interrupts on a legacy IDE device using MMIO or PIO,
 *	wait for idle, clear any pending interrupts.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

static inline u8 ata_irq_on(struct ata_port *ap)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 tmp;

	ap->ctl &= ~ATA_NIEN;
	ap->last_ctl = ap->ctl;

	if (ap->flags & ATA_FLAG_MMIO)
		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
	else
		outb(ap->ctl, ioaddr->ctl_addr);
	tmp = ata_wait_idle(ap);

	ap->ops->irq_clear(ap);

	return tmp;
}


/**
 *	ata_irq_ack - Acknowledge a device interrupt.
 *	@ap: Port on which interrupts are enabled.
 *
 *	Wait up to 10 ms for legacy IDE device to become idle (BUSY
 *	or BUSY+DRQ clear).  Obtain dma status and port status from
 *	device.  Clear the interrupt.  Return port status.
 *
 *	LOCKING:
 */

static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
{
	unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
	u8 host_stat, post_stat, status;

	status = ata_busy_wait(ap, bits, 1000);
	if (status & bits)
		DPRINTK("abnormal status 0x%X\n", status);

	/* get controller status; clear intr, err bits */
	if (ap->flags & ATA_FLAG_MMIO) {
		void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
		host_stat = readb(mmio + ATA_DMA_STATUS);
		writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
		       mmio + ATA_DMA_STATUS);

		post_stat = readb(mmio + ATA_DMA_STATUS);
	} else {
		host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
		outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
		     ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

		post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
	}

	VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
		host_stat, post_stat, status);

	return status;
}

static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
{
	return ap->ops->scr_read(ap, reg);
}

static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
{
	ap->ops->scr_write(ap, reg, val);
}

static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
				   u32 val)
{
	ap->ops->scr_write(ap, reg, val);
	(void) ap->ops->scr_read(ap, reg);
}

static inline unsigned int sata_dev_present(struct ata_port *ap)
{
	return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
}

static inline int ata_try_flush_cache(const struct ata_device *dev)
{
	return ata_id_wcache_enabled(dev->id) ||
	       ata_id_has_flush(dev->id) ||
	       ata_id_has_flush_ext(dev->id);
}

static inline unsigned int ac_err_mask(u8 status)
{
	if (status & ATA_BUSY)
		return AC_ERR_ATA_BUS;
	if (status & (ATA_ERR | ATA_DF))
		return AC_ERR_DEV;
	return 0;
}

static inline unsigned int __ac_err_mask(u8 status)
{
	unsigned int mask = ac_err_mask(status);
	if (mask == 0)
		return AC_ERR_OTHER;
	return mask;
}

static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
{
	ap->pad_dma = 0;
	ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
				     &ap->pad_dma, GFP_KERNEL);
	return (ap->pad == NULL) ? -ENOMEM : 0;
}

static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
{
	dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
}

#endif /* __LINUX_LIBATA_H__ */