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ide: add ide_queue_pc_tail() helper
[linux-2.6-block.git] / include / linux / ide.h
CommitLineData
1da177e4
LT		 1#ifndef _IDE_H
2#define _IDE_H
3/*
4 * linux/include/linux/ide.h
5 *
6 * Copyright (C) 1994-2002 Linus Torvalds & authors
7 */
8
1da177e4
LT		 9#include <linux/init.h>
10#include <linux/ioport.h>
3ceca727 11#include <linux/ata.h>
1da177e4
LT		 12#include <linux/blkdev.h>
13#include <linux/proc_fs.h>
14#include <linux/interrupt.h>
15#include <linux/bitops.h>
16#include <linux/bio.h>
17#include <linux/device.h>
18#include <linux/pci.h>
f36d4024 19#include <linux/completion.h>
feb22b7f 20#include <linux/pm.h>
e3a59b4d
HR		 21#ifdef CONFIG_BLK_DEV_IDEACPI
22#include <acpi/acpi.h>
23#endif
1da177e4
LT		 24#include <asm/byteorder.h>
25#include <asm/system.h>
26#include <asm/io.h>
f9383c42 27#include <asm/mutex.h>
1da177e4 28
729d4de9 29#if defined(CONFIG_CRIS) || defined(CONFIG_FRV)
4ee06b7e
BZ		 30# define SUPPORT_VLB_SYNC 0
31#else
32# define SUPPORT_VLB_SYNC 1
1da177e4
LT		 33#endif
34
35/*
36 * Used to indicate "no IRQ", should be a value that cannot be an IRQ
37 * number.
38 */
39
40#define IDE_NO_IRQ (-1)
41
1da177e4
LT		 42typedef unsigned char byte; /* used everywhere */
43
44/*
45 * Probably not wise to fiddle with these
46 */
47#define ERROR_MAX 8 /* Max read/write errors per sector */
48#define ERROR_RESET 3 /* Reset controller every 4th retry */
49#define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
50
1da177e4
LT		 51/*
52 * state flags
53 */
54
55#define DMA_PIO_RETRY 1 /* retrying in PIO */
56
57#define HWIF(drive) ((ide_hwif_t *)((drive)->hwif))
58#define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
59
60/*
61 * Definitions for accessing IDE controller registers
62 */
63#define IDE_NR_PORTS (10)
64
4c3032d8
BZ		 65struct ide_io_ports {
66 unsigned long data_addr;
67
68 union {
69 unsigned long error_addr; /* read: error */
70 unsigned long feature_addr; /* write: feature */
71 };
72
73 unsigned long nsect_addr;
74 unsigned long lbal_addr;
75 unsigned long lbam_addr;
76 unsigned long lbah_addr;
77
78 unsigned long device_addr;
79
80 union {
81 unsigned long status_addr; /*  read: status  */
82 unsigned long command_addr; /* write: command */
83 };
84
85 unsigned long ctl_addr;
86
87 unsigned long irq_addr;
88};
1da177e4
LT		 89
90#define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
1da177e4 91
3a7d2484
BZ		 92#define BAD_R_STAT (ATA_BUSY | ATA_ERR)
93#define BAD_W_STAT (BAD_R_STAT | ATA_DF)
94#define BAD_STAT (BAD_R_STAT | ATA_DRQ)
95#define DRIVE_READY (ATA_DRDY | ATA_DSC)
96
97#define BAD_CRC (ATA_ABORTED | ATA_ICRC)
1da177e4
LT		 98
99#define SATA_NR_PORTS (3) /* 16 possible ?? */
100
101#define SATA_STATUS_OFFSET (0)
1da177e4 102#define SATA_ERROR_OFFSET (1)
1da177e4 103#define SATA_CONTROL_OFFSET (2)
1da177e4 104
1da177e4
LT		 105/*
106 * Our Physical Region Descriptor (PRD) table should be large enough
107 * to handle the biggest I/O request we are likely to see. Since requests
108 * can have no more than 256 sectors, and since the typical blocksize is
109 * two or more sectors, we could get by with a limit of 128 entries here for
110 * the usual worst case. Most requests seem to include some contiguous blocks,
111 * further reducing the number of table entries required.
112 *
113 * The driver reverts to PIO mode for individual requests that exceed
114 * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
115 * 100% of all crazy scenarios here is not necessary.
116 *
117 * As it turns out though, we must allocate a full 4KB page for this,
118 * so the two PRD tables (ide0 & ide1) will each get half of that,
119 * allowing each to have about 256 entries (8 bytes each) from this.
120 */
121#define PRD_BYTES 8
122#define PRD_ENTRIES 256
123
124/*
125 * Some more useful definitions
126 */
127#define PARTN_BITS 6 /* number of minor dev bits for partitions */
128#define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
129#define SECTOR_SIZE 512
151a6701 130
1da177e4
LT		 131#define IDE_LARGE_SEEK(b1,b2,t) (((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))
132
133/*
134 * Timeouts for various operations:
135 */
136#define WAIT_DRQ (HZ/10) /* 100msec - spec allows up to 20ms */
137#define WAIT_READY (5*HZ) /* 5sec - some laptops are very slow */
138#define WAIT_PIDENTIFY (10*HZ) /* 10sec - should be less than 3ms (?), if all ATAPI CD is closed at boot */
139#define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
140#define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
141#define WAIT_MIN_SLEEP (2*HZ/100) /* 20msec - minimum sleep time */
142
79e36a9f
EO		 143/*
144 * Op codes for special requests to be handled by ide_special_rq().
145 * Values should be in the range of 0x20 to 0x3f.
146 */
147#define REQ_DRIVE_RESET 0x20
148
1da177e4
LT		 149/*
150 * Check for an interrupt and acknowledge the interrupt status
151 */
152struct hwif_s;
153typedef int (ide_ack_intr_t)(struct hwif_s *);
154
1da177e4
LT		 155/*
156 * hwif_chipset_t is used to keep track of the specific hardware
157 * chipset used by each IDE interface, if known.
158 */
528a572d 159enum { ide_unknown, ide_generic, ide_pci,
1da177e4
LT		 160 ide_cmd640, ide_dtc2278, ide_ali14xx,
161 ide_qd65xx, ide_umc8672, ide_ht6560b,
162 ide_rz1000, ide_trm290,
163 ide_cmd646, ide_cy82c693, ide_4drives,
b7691646 164 ide_pmac, ide_acorn,
9a0e77f2 165 ide_au1xxx, ide_palm3710
528a572d
BZ		 166};
167
168typedef u8 hwif_chipset_t;
1da177e4
LT		 169
170/*
171 * Structure to hold all information about the location of this port
172 */
173typedef struct hw_regs_s {
4c3032d8
BZ		 174 union {
175 struct ide_io_ports io_ports;
176 unsigned long io_ports_array[IDE_NR_PORTS];
177 };
178
1da177e4 179 int irq; /* our irq number */
1da177e4
LT		 180 ide_ack_intr_t *ack_intr; /* acknowledge interrupt */
181 hwif_chipset_t chipset;
c56c5648 182 struct device *dev, *parent;
d6276b5f 183 unsigned long config;
1da177e4
LT		 184} hw_regs_t;
185
cbb010c1 186void ide_init_port_data(struct hwif_s *, unsigned int);
57c802e8 187void ide_init_port_hw(struct hwif_s *, hw_regs_t *);
baa8f3e9 188
1da177e4
LT		 189static inline void ide_std_init_ports(hw_regs_t *hw,
190 unsigned long io_addr,
191 unsigned long ctl_addr)
192{
193 unsigned int i;
194
4c3032d8
BZ		 195 for (i = 0; i <= 7; i++)
196 hw->io_ports_array[i] = io_addr++;
1da177e4 197
4c3032d8 198 hw->io_ports.ctl_addr = ctl_addr;
1da177e4
LT		 199}
200
a861beb1
BZ		 201/* for IDE PCI controllers in legacy mode, temporary */
202static inline int __ide_default_irq(unsigned long base)
203{
204 switch (base) {
205#ifdef CONFIG_IA64
206 case 0x1f0: return isa_irq_to_vector(14);
207 case 0x170: return isa_irq_to_vector(15);
208#else
209 case 0x1f0: return 14;
210 case 0x170: return 15;
211#endif
212 }
213 return 0;
214}
215
2a8f7450
BZ		 216#if defined(CONFIG_ARM) || defined(CONFIG_FRV) || defined(CONFIG_M68K) || \
217 defined(CONFIG_MIPS) || defined(CONFIG_MN10300) || defined(CONFIG_PARISC) \
218 || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || defined(CONFIG_SPARC64)
1da177e4 219#include <asm/ide.h>
2a8f7450
BZ		 220#else
221#include <asm-generic/ide_iops.h>
222#endif
1da177e4 223
c5bfc375 224#define MAX_HWIFS 10
83ae20c8 225
1da177e4
LT		 226/* Currently only m68k, apus and m8xx need it */
227#ifndef IDE_ARCH_ACK_INTR
228# define ide_ack_intr(hwif) (1)
229#endif
230
231/* Currently only Atari needs it */
232#ifndef IDE_ARCH_LOCK
233# define ide_release_lock() do {} while (0)
234# define ide_get_lock(hdlr, data) do {} while (0)
235#endif /* IDE_ARCH_LOCK */
236
237/*
238 * Now for the data we need to maintain per-drive: ide_drive_t
239 */
240
241#define ide_scsi 0x21
242#define ide_disk 0x20
243#define ide_optical 0x7
244#define ide_cdrom 0x5
245#define ide_tape 0x1
246#define ide_floppy 0x0
247
248/*
249 * Special Driver Flags
250 *
251 * set_geometry : respecify drive geometry
252 * recalibrate : seek to cyl 0
253 * set_multmode : set multmode count
254 * set_tune : tune interface for drive
255 * serviced : service command
256 * reserved : unused
257 */
258typedef union {
259 unsigned all : 8;
260 struct {
1da177e4
LT		 261 unsigned set_geometry : 1;
262 unsigned recalibrate : 1;
263 unsigned set_multmode : 1;
264 unsigned set_tune : 1;
265 unsigned serviced : 1;
266 unsigned reserved : 3;
1da177e4
LT		 267 } b;
268} special_t;
269
1da177e4
LT		 270/*
271 * ATA-IDE Select Register, aka Device-Head
272 *
273 * head : always zeros here
274 * unit : drive select number: 0/1
275 * bit5 : always 1
276 * lba : using LBA instead of CHS
277 * bit7 : always 1
278 */
279typedef union {
280 unsigned all : 8;
281 struct {
282#if defined(__LITTLE_ENDIAN_BITFIELD)
283 unsigned head : 4;
284 unsigned unit : 1;
285 unsigned bit5 : 1;
286 unsigned lba : 1;
287 unsigned bit7 : 1;
288#elif defined(__BIG_ENDIAN_BITFIELD)
289 unsigned bit7 : 1;
290 unsigned lba : 1;
291 unsigned bit5 : 1;
292 unsigned unit : 1;
293 unsigned head : 4;
294#else
295#error "Please fix <asm/byteorder.h>"
296#endif
297 } b;
298} select_t, ata_select_t;
299
1da177e4
LT		 300/*
301 * Status returned from various ide_ functions
302 */
303typedef enum {
304 ide_stopped, /* no drive operation was started */
305 ide_started, /* a drive operation was started, handler was set */
306} ide_startstop_t;
307
8185d5aa 308struct ide_devset;
1da177e4 309struct ide_driver_s;
1da177e4 310
e3a59b4d
HR		 311#ifdef CONFIG_BLK_DEV_IDEACPI
312struct ide_acpi_drive_link;
313struct ide_acpi_hwif_link;
314#endif
315
3b8ac539
BP		 316/* ATAPI device flags */
317enum {
318 IDE_AFLAG_DRQ_INTERRUPT = (1 << 0),
319 IDE_AFLAG_MEDIA_CHANGED = (1 << 1),
320
321 /* ide-cd */
322 /* Drive cannot lock the door. */
323 IDE_AFLAG_NO_DOORLOCK = (1 << 2),
324 /* Drive cannot eject the disc. */
325 IDE_AFLAG_NO_EJECT = (1 << 3),
326 /* Drive is a pre ATAPI 1.2 drive. */
327 IDE_AFLAG_PRE_ATAPI12 = (1 << 4),
328 /* TOC addresses are in BCD. */
329 IDE_AFLAG_TOCADDR_AS_BCD = (1 << 5),
330 /* TOC track numbers are in BCD. */
331 IDE_AFLAG_TOCTRACKS_AS_BCD = (1 << 6),
332 /*
333 * Drive does not provide data in multiples of SECTOR_SIZE
334 * when more than one interrupt is needed.
335 */
336 IDE_AFLAG_LIMIT_NFRAMES = (1 << 7),
337 /* Seeking in progress. */
338 IDE_AFLAG_SEEKING = (1 << 8),
339 /* Saved TOC information is current. */
340 IDE_AFLAG_TOC_VALID = (1 << 9),
341 /* We think that the drive door is locked. */
342 IDE_AFLAG_DOOR_LOCKED = (1 << 10),
343 /* SET_CD_SPEED command is unsupported. */
344 IDE_AFLAG_NO_SPEED_SELECT = (1 << 11),
345 IDE_AFLAG_VERTOS_300_SSD = (1 << 12),
346 IDE_AFLAG_VERTOS_600_ESD = (1 << 13),
347 IDE_AFLAG_SANYO_3CD = (1 << 14),
348 IDE_AFLAG_FULL_CAPS_PAGE = (1 << 15),
349 IDE_AFLAG_PLAY_AUDIO_OK = (1 << 16),
350 IDE_AFLAG_LE_SPEED_FIELDS = (1 << 17),
351
352 /* ide-floppy */
353 /* Format in progress */
354 IDE_AFLAG_FORMAT_IN_PROGRESS = (1 << 18),
355 /* Avoid commands not supported in Clik drive */
356 IDE_AFLAG_CLIK_DRIVE = (1 << 19),
357 /* Requires BH algorithm for packets */
358 IDE_AFLAG_ZIP_DRIVE = (1 << 20),
359
360 /* ide-tape */
361 IDE_AFLAG_IGNORE_DSC = (1 << 21),
362 /* 0 When the tape position is unknown */
363 IDE_AFLAG_ADDRESS_VALID = (1 << 22),
364 /* Device already opened */
365 IDE_AFLAG_BUSY = (1 << 23),
366 /* Attempt to auto-detect the current user block size */
367 IDE_AFLAG_DETECT_BS = (1 << 24),
368 /* Currently on a filemark */
369 IDE_AFLAG_FILEMARK = (1 << 25),
370 /* 0 = no tape is loaded, so we don't rewind after ejecting */
f20f2586
BP		 371 IDE_AFLAG_MEDIUM_PRESENT = (1 << 26),
372
373 IDE_AFLAG_NO_AUTOCLOSE = (1 << 27),
3b8ac539
BP		 374};
375
d7c26ebb 376struct ide_drive_s {
1da177e4
LT		 377 char name[4]; /* drive name, such as "hda" */
378 char driver_req[10]; /* requests specific driver */
379
165125e1 380 struct request_queue *queue; /* request queue */
1da177e4
LT		 381
382 struct request *rq; /* current request */
383 struct ide_drive_s *next; /* circular list of hwgroup drives */
1da177e4 384 void *driver_data; /* extra driver data */
48fb2688 385 u16 *id; /* identification info */
7662d046 386#ifdef CONFIG_IDE_PROC_FS
1da177e4 387 struct proc_dir_entry *proc; /* /proc/ide/ directory entry */
8185d5aa 388 const struct ide_devset **settings; /* /proc/ide/ drive settings */
7662d046 389#endif
1da177e4
LT		 390 struct hwif_s *hwif; /* actually (ide_hwif_t *) */
391
392 unsigned long sleep; /* sleep until this time */
393 unsigned long service_start; /* time we started last request */
394 unsigned long service_time; /* service time of last request */
395 unsigned long timeout; /* max time to wait for irq */
396
397 special_t special; /* special action flags */
398 select_t select; /* basic drive/head select reg value */
399
1da177e4
LT		 400 u8 retry_pio; /* retrying dma capable host in pio */
401 u8 state; /* retry state */
402 u8 waiting_for_dma; /* dma currently in progress */
1da177e4 403
8185d5aa
BZ		 404 unsigned keep_settings : 1; /* restore settings after drive reset */
405 unsigned using_dma : 1; /* disk is using dma for read/write */
406 unsigned unmask : 1; /* okay to unmask other irqs */
407 unsigned noflush : 1; /* don't attempt flushes */
408 unsigned dsc_overlap : 1; /* DSC overlap */
409 unsigned nice1 : 1; /* give potential excess bandwidth */
1da177e4
LT		 410 unsigned present : 1; /* drive is physically present */
411 unsigned dead : 1; /* device ejected hint */
412 unsigned id_read : 1; /* 1=id read from disk 0 = synthetic */
413 unsigned noprobe : 1; /* from: hdx=noprobe */
414 unsigned removable : 1; /* 1 if need to do check_media_change */
415 unsigned attach : 1; /* needed for removable devices */
1da177e4
LT		 416 unsigned forced_geom : 1; /* 1 if hdx=c,h,s was given at boot */
417 unsigned no_unmask : 1; /* disallow setting unmask bit */
418 unsigned no_io_32bit : 1; /* disallow enabling 32bit I/O */
1da177e4 419 unsigned doorlocking : 1; /* for removable only: door lock/unlock works */
c223701c 420 unsigned nodma : 1; /* disallow DMA */
1da177e4 421 unsigned blocked : 1; /* 1=powermanagment told us not to do anything, so sleep nicely */
1da177e4
LT		 422 unsigned scsi : 1; /* 0=default, 1=ide-scsi emulation */
423 unsigned sleeping : 1; /* 1=sleeping & sleep field valid */
424 unsigned post_reset : 1;
7f8f48af 425 unsigned udma33_warned : 1;
8185d5aa
BZ		 426 unsigned addressing : 2; /* 0=28-bit, 1=48-bit, 2=48-bit doing 28-bit */
427 unsigned wcache : 1; /* status of write cache */
428 unsigned nowerr : 1; /* used for ignoring ATA_DF */
1da177e4
LT		 429
430 u8 quirk_list; /* considered quirky, set for a specific host */
431 u8 init_speed; /* transfer rate set at boot */
1da177e4 432 u8 current_speed; /* current transfer rate set */
513daadd 433 u8 desired_speed; /* desired transfer rate set */
1da177e4 434 u8 dn; /* now wide spread use */
1da177e4
LT		 435 u8 acoustic; /* acoustic management */
436 u8 media; /* disk, cdrom, tape, floppy, ... */
1da177e4
LT		 437 u8 ready_stat; /* min status value for drive ready */
438 u8 mult_count; /* current multiple sector setting */
439 u8 mult_req; /* requested multiple sector setting */
440 u8 tune_req; /* requested drive tuning setting */
441 u8 io_32bit; /* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
3a7d2484 442 u8 bad_wstat; /* used for ignoring ATA_DF */
1da177e4
LT		 443 u8 head; /* "real" number of heads */
444 u8 sect; /* "real" sectors per track */
445 u8 bios_head; /* BIOS/fdisk/LILO number of heads */
446 u8 bios_sect; /* BIOS/fdisk/LILO sectors per track */
447
448 unsigned int bios_cyl; /* BIOS/fdisk/LILO number of cyls */
449 unsigned int cyl; /* "real" number of cyls */
26bcb879 450 unsigned int drive_data; /* used by set_pio_mode/selectproc */
1da177e4
LT		 451 unsigned int failures; /* current failure count */
452 unsigned int max_failures; /* maximum allowed failure count */
dbe217af 453 u64 probed_capacity;/* initial reported media capacity (ide-cd only currently) */
1da177e4
LT		 454
455 u64 capacity64; /* total number of sectors */
456
457 int lun; /* logical unit */
458 int crc_count; /* crc counter to reduce drive speed */
e3a59b4d
HR		 459#ifdef CONFIG_BLK_DEV_IDEACPI
460 struct ide_acpi_drive_link *acpidata;
461#endif
1da177e4
LT		 462 struct list_head list;
463 struct device gendev;
f36d4024 464 struct completion gendev_rel_comp; /* to deal with device release() */
d7c26ebb
BP		 465
466 /* callback for packet commands */
467 void (*pc_callback)(struct ide_drive_s *);
3b8ac539
BP		 468
469 unsigned long atapi_flags;
d7c26ebb
BP		 470};
471
472typedef struct ide_drive_s ide_drive_t;
1da177e4 473
8604affd
BZ		 474#define to_ide_device(dev)container_of(dev, ide_drive_t, gendev)
475
374e042c 476struct ide_task_s;
039788e1 477struct ide_port_info;
1da177e4 478
374e042c
BZ		 479struct ide_tp_ops {
480 void (*exec_command)(struct hwif_s *, u8);
481 u8 (*read_status)(struct hwif_s *);
482 u8 (*read_altstatus)(struct hwif_s *);
483 u8 (*read_sff_dma_status)(struct hwif_s *);
484
485 void (*set_irq)(struct hwif_s *, int);
486
487 void (*tf_load)(ide_drive_t *, struct ide_task_s *);
488 void (*tf_read)(ide_drive_t *, struct ide_task_s *);
489
490 void (*input_data)(ide_drive_t *, struct request *, void *,
491 unsigned int);
492 void (*output_data)(ide_drive_t *, struct request *, void *,
493 unsigned int);
494};
495
496extern const struct ide_tp_ops default_tp_ops;
497
39b986a6
BZ		 498/**
499 * struct ide_port_ops - IDE port operations
500 *
501 * @init_dev: host specific initialization of a device
502 * @set_pio_mode: routine to program host for PIO mode
503 * @set_dma_mode: routine to program host for DMA mode
504 * @selectproc: tweaks hardware to select drive
505 * @reset_poll: chipset polling based on hba specifics
506 * @pre_reset: chipset specific changes to default for device-hba resets
507 * @resetproc: routine to reset controller after a disk reset
508 * @maskproc: special host masking for drive selection
509 * @quirkproc: check host's drive quirk list
510 *
511 * @mdma_filter: filter MDMA modes
512 * @udma_filter: filter UDMA modes
513 *
514 * @cable_detect: detect cable type
515 */
ac95beed 516struct ide_port_ops {
e6d95bd1 517 void (*init_dev)(ide_drive_t *);
ac95beed 518 void (*set_pio_mode)(ide_drive_t *, const u8);
ac95beed 519 void (*set_dma_mode)(ide_drive_t *, const u8);
ac95beed 520 void (*selectproc)(ide_drive_t *);
ac95beed 521 int (*reset_poll)(ide_drive_t *);
ac95beed 522 void (*pre_reset)(ide_drive_t *);
ac95beed 523 void (*resetproc)(ide_drive_t *);
ac95beed 524 void (*maskproc)(ide_drive_t *, int);
ac95beed
BZ		 525 void (*quirkproc)(ide_drive_t *);
526
527 u8 (*mdma_filter)(ide_drive_t *);
528 u8 (*udma_filter)(ide_drive_t *);
529
530 u8 (*cable_detect)(struct hwif_s *);
531};
532
5e37bdc0
BZ		 533struct ide_dma_ops {
534 void (*dma_host_set)(struct ide_drive_s *, int);
535 int (*dma_setup)(struct ide_drive_s *);
536 void (*dma_exec_cmd)(struct ide_drive_s *, u8);
537 void (*dma_start)(struct ide_drive_s *);
538 int (*dma_end)(struct ide_drive_s *);
539 int (*dma_test_irq)(struct ide_drive_s *);
540 void (*dma_lost_irq)(struct ide_drive_s *);
541 void (*dma_timeout)(struct ide_drive_s *);
542};
543
08da591e
BZ		 544struct ide_host;
545
1da177e4
LT		 546typedef struct hwif_s {
547 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
548 struct hwif_s *mate; /* other hwif from same PCI chip */
549 struct hwgroup_s *hwgroup; /* actually (ide_hwgroup_t *) */
550 struct proc_dir_entry *proc; /* /proc/ide/ directory entry */
551
08da591e
BZ		 552 struct ide_host *host;
553
1da177e4
LT		 554 char name[6]; /* name of interface, eg. "ide0" */
555
4c3032d8
BZ		 556 struct ide_io_ports io_ports;
557
1da177e4 558 unsigned long sata_scr[SATA_NR_PORTS];
1da177e4 559
1da177e4
LT		 560 ide_drive_t drives[MAX_DRIVES]; /* drive info */
561
562 u8 major; /* our major number */
563 u8 index; /* 0 for ide0; 1 for ide1; ... */
564 u8 channel; /* for dual-port chips: 0=primary, 1=secondary */
1da177e4 565
e95d9c6b 566 u32 host_flags;
6a824c92 567
4099d143
BZ		 568 u8 pio_mask;
569
1da177e4
LT		 570 u8 ultra_mask;
571 u8 mwdma_mask;
572 u8 swdma_mask;
573
49521f97
BZ		 574 u8 cbl; /* cable type */
575
1da177e4
LT		 576 hwif_chipset_t chipset; /* sub-module for tuning.. */
577
36501650
BZ		 578 struct device *dev;
579
18e181fe
BZ		 580 ide_ack_intr_t *ack_intr;
581
1da177e4
LT		 582 void (*rw_disk)(ide_drive_t *, struct request *);
583
374e042c 584 const struct ide_tp_ops *tp_ops;
ac95beed 585 const struct ide_port_ops *port_ops;
f37afdac 586 const struct ide_dma_ops *dma_ops;
bfa14b42 587
f0dd8712 588 void (*ide_dma_clear_irq)(ide_drive_t *drive);
1da177e4 589
1da177e4
LT		 590 /* dma physical region descriptor table (cpu view) */
591 unsigned int *dmatable_cpu;
592 /* dma physical region descriptor table (dma view) */
593 dma_addr_t dmatable_dma;
594 /* Scatter-gather list used to build the above */
595 struct scatterlist *sg_table;
596 int sg_max_nents; /* Maximum number of entries in it */
597 int sg_nents; /* Current number of entries in it */
598 int sg_dma_direction; /* dma transfer direction */
599
600 /* data phase of the active command (currently only valid for PIO/DMA) */
601 int data_phase;
602
603 unsigned int nsect;
604 unsigned int nleft;
55c16a70 605 struct scatterlist *cursg;
1da177e4
LT		 606 unsigned int cursg_ofs;
607
1da177e4
LT		 608 int rqsize; /* max sectors per request */
609 int irq; /* our irq number */
610
1da177e4 611 unsigned long dma_base; /* base addr for dma ports */
1da177e4 612
1da177e4
LT		 613 unsigned long config_data; /* for use by chipset-specific code */
614 unsigned long select_data; /* for use by chipset-specific code */
615
020e322d
SS		 616 unsigned long extra_base; /* extra addr for dma ports */
617 unsigned extra_ports; /* number of extra dma ports */
618
1da177e4 619 unsigned present : 1; /* this interface exists */
1da177e4
LT		 620 unsigned serialized : 1; /* serialized all channel operation */
621 unsigned sharing_irq: 1; /* 1 = sharing irq with another hwif */
1da177e4
LT		 622 unsigned sg_mapped : 1; /* sg_table and sg_nents are ready */
623
f74c9141
BZ		 624 struct device gendev;
625 struct device *portdev;
626
f36d4024 627 struct completion gendev_rel_comp; /* To deal with device release() */
1da177e4
LT		 628
629 void *hwif_data; /* extra hwif data */
630
631 unsigned dma;
e3a59b4d
HR		 632
633#ifdef CONFIG_BLK_DEV_IDEACPI
634 struct ide_acpi_hwif_link *acpidata;
635#endif
22fc6ecc 636} ____cacheline_internodealigned_in_smp ide_hwif_t;
1da177e4 637
48c3c107
BZ		 638struct ide_host {
639 ide_hwif_t *ports[MAX_HWIFS];
640 unsigned int n_ports;
6cdf6eb3 641 struct device *dev[2];
feb22b7f 642 unsigned int (*init_chipset)(struct pci_dev *);
ef0b0427 643 unsigned long host_flags;
6cdf6eb3 644 void *host_priv;
48c3c107
BZ		 645};
646
1da177e4
LT		 647/*
648 * internal ide interrupt handler type
649 */
1da177e4
LT		 650typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
651typedef int (ide_expiry_t)(ide_drive_t *);
652
0eea6458 653/* used by ide-cd, ide-floppy, etc. */
9567b349 654typedef void (xfer_func_t)(ide_drive_t *, struct request *rq, void *, unsigned);
0eea6458 655
1da177e4
LT		 656typedef struct hwgroup_s {
657 /* irq handler, if active */
658 ide_startstop_t (*handler)(ide_drive_t *);
a6fbb1c8 659
1da177e4
LT		 660 /* BOOL: protects all fields below */
661 volatile int busy;
662 /* BOOL: wake us up on timer expiry */
663 unsigned int sleeping : 1;
664 /* BOOL: polling active & poll_timeout field valid */
665 unsigned int polling : 1;
913759ac 666
1da177e4
LT		 667 /* current drive */
668 ide_drive_t *drive;
669 /* ptr to current hwif in linked-list */
670 ide_hwif_t *hwif;
671
1da177e4
LT		 672 /* current request */
673 struct request *rq;
a6fbb1c8 674
1da177e4
LT		 675 /* failsafe timer */
676 struct timer_list timer;
1da177e4
LT		 677 /* timeout value during long polls */
678 unsigned long poll_timeout;
679 /* queried upon timeouts */
680 int (*expiry)(ide_drive_t *);
a6fbb1c8 681
23450319
SS		 682 int req_gen;
683 int req_gen_timer;
1da177e4
LT		 684} ide_hwgroup_t;
685
7662d046
BZ		 686typedef struct ide_driver_s ide_driver_t;
687
f9383c42 688extern struct mutex ide_setting_mtx;
1da177e4 689
8185d5aa 690int get_io_32bit(ide_drive_t *);
7662d046 691int set_io_32bit(ide_drive_t *, int);
8185d5aa 692int get_ksettings(ide_drive_t *);
263138a0 693int set_ksettings(ide_drive_t *, int);
7662d046 694int set_pio_mode(ide_drive_t *, int);
8185d5aa 695int get_unmaskirq(ide_drive_t *);
263138a0 696int set_unmaskirq(ide_drive_t *, int);
8185d5aa 697int get_using_dma(ide_drive_t *);
7662d046
BZ		 698int set_using_dma(ide_drive_t *, int);
699
8185d5aa
BZ		 700#define ide_devset_get(name, field) \
701int get_##name(ide_drive_t *drive) \
702{ \
703 return drive->field; \
704}
705
706#define ide_devset_set(name, field) \
707int set_##name(ide_drive_t *drive, int arg) \
708{ \
709 drive->field = arg; \
710 return 0; \
711}
712
eaec3e7d
BP		 713/* ATAPI packet command flags */
714enum {
715 /* set when an error is considered normal - no retry (ide-tape) */
716 PC_FLAG_ABORT = (1 << 0),
717 PC_FLAG_SUPPRESS_ERROR = (1 << 1),
718 PC_FLAG_WAIT_FOR_DSC = (1 << 2),
719 PC_FLAG_DMA_OK = (1 << 3),
5e331095
BZ		 720 PC_FLAG_DMA_IN_PROGRESS = (1 << 4),
721 PC_FLAG_DMA_ERROR = (1 << 5),
722 PC_FLAG_WRITING = (1 << 6),
eaec3e7d 723 /* command timed out */
5e331095 724 PC_FLAG_TIMEDOUT = (1 << 7),
eaec3e7d
BP		 725};
726
7bf7420a
BZ		 727/*
728 * With each packet command, we allocate a buffer of IDE_PC_BUFFER_SIZE bytes.
729 * This is used for several packet commands (not for READ/WRITE commands).
730 */
731#define IDE_PC_BUFFER_SIZE 256
732
8303b46e
BP		 733struct ide_atapi_pc {
734 /* actual packet bytes */
735 u8 c[12];
736 /* incremented on each retry */
737 int retries;
738 int error;
739
740 /* bytes to transfer */
741 int req_xfer;
742 /* bytes actually transferred */
743 int xferred;
744
745 /* data buffer */
746 u8 *buf;
747 /* current buffer position */
748 u8 *cur_pos;
749 int buf_size;
750 /* missing/available data on the current buffer */
751 int b_count;
752
753 /* the corresponding request */
754 struct request *rq;
755
756 unsigned long flags;
757
758 /*
759 * those are more or less driver-specific and some of them are subject
760 * to change/removal later.
761 */
7bf7420a 762 u8 pc_buf[IDE_PC_BUFFER_SIZE];
1b06e92a 763
8303b46e
BP		 764 /* idetape only */
765 struct idetape_bh *bh;
766 char *b_data;
767
768 /* idescsi only for now */
769 struct scatterlist *sg;
770 unsigned int sg_cnt;
771
772 struct scsi_cmnd *scsi_cmd;
773 void (*done) (struct scsi_cmnd *);
774
775 unsigned long timeout;
776};
777
7662d046 778#ifdef CONFIG_IDE_PROC_FS
1da177e4
LT		 779/*
780 * configurable drive settings
781 */
782
8185d5aa
BZ		 783#define S_READ (1 << 0)
784#define S_WRITE (1 << 1)
785#define S_RW (S_READ | S_WRITE)
786#define S_NOLOCK (1 << 2)
787
788struct ide_devset {
789 const char *name;
790 unsigned int flags;
791 int min, max;
792 int (*get)(ide_drive_t *);
793 int (*set)(ide_drive_t *, int);
794 int (*mulf)(ide_drive_t *);
795 int (*divf)(ide_drive_t *);
796};
797
798#define __DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf) { \
799 .name = __stringify(_name), \
800 .flags = _flags, \
801 .min = _min, \
802 .max = _max, \
803 .get = _get, \
804 .set = _set, \
805 .mulf = _mulf, \
806 .divf = _divf, \
807}
808
809#define __IDE_DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf) \
810static const struct ide_devset ide_devset_##_name = \
811 __DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf)
812
813#define IDE_DEVSET(_name, _flags, _min, _max, _get, _set) \
814__IDE_DEVSET(_name, _flags, _min, _max, _get, _set, NULL, NULL)
815
816#define ide_devset_rw_nolock(_name, _min, _max, _func) \
817IDE_DEVSET(_name, S_RW | S_NOLOCK, _min, _max, get_##_func, set_##_func)
818
819#define ide_devset_w_nolock(_name, _min, _max, _func) \
820IDE_DEVSET(_name, S_WRITE | S_NOLOCK, _min, _max, NULL, set_##_func)
821
822#define ide_devset_rw(_name, _min, _max, _field) \
823static ide_devset_get(_name, _field); \
824static ide_devset_set(_name, _field); \
825IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name)
826
827#define ide_devset_r(_name, _min, _max, _field) \
828ide_devset_get(_name, _field) \
829IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL)
1da177e4
LT		 830
831/*
832 * /proc/ide interface
833 */
834typedef struct {
835 const char *name;
836 mode_t mode;
837 read_proc_t *read_proc;
838 write_proc_t *write_proc;
839} ide_proc_entry_t;
840
ecfd80e4
BZ		 841void proc_ide_create(void);
842void proc_ide_destroy(void);
5cbf79cd 843void ide_proc_register_port(ide_hwif_t *);
d9270a3f 844void ide_proc_port_register_devices(ide_hwif_t *);
5b0c4b30 845void ide_proc_unregister_device(ide_drive_t *);
5cbf79cd 846void ide_proc_unregister_port(ide_hwif_t *);
7662d046
BZ		 847void ide_proc_register_driver(ide_drive_t *, ide_driver_t *);
848void ide_proc_unregister_driver(ide_drive_t *, ide_driver_t *);
849
1da177e4
LT		 850read_proc_t proc_ide_read_capacity;
851read_proc_t proc_ide_read_geometry;
852
1da177e4
LT		 853/*
854 * Standard exit stuff:
855 */
856#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) \
857{ \
858 len -= off; \
859 if (len < count) { \
860 *eof = 1; \
861 if (len <= 0) \
862 return 0; \
863 } else \
864 len = count; \
865 *start = page + off; \
866 return len; \
867}
868#else
ecfd80e4
BZ		 869static inline void proc_ide_create(void) { ; }
870static inline void proc_ide_destroy(void) { ; }
5cbf79cd 871static inline void ide_proc_register_port(ide_hwif_t *hwif) { ; }
d9270a3f 872static inline void ide_proc_port_register_devices(ide_hwif_t *hwif) { ; }
5b0c4b30 873static inline void ide_proc_unregister_device(ide_drive_t *drive) { ; }
5cbf79cd 874static inline void ide_proc_unregister_port(ide_hwif_t *hwif) { ; }
7662d046
BZ		 875static inline void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }
876static inline void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }
1da177e4
LT		 877#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) return 0;
878#endif
879
880/*
881 * Power Management step value (rq->pm->pm_step).
882 *
883 * The step value starts at 0 (ide_pm_state_start_suspend) for a
884 * suspend operation or 1000 (ide_pm_state_start_resume) for a
885 * resume operation.
886 *
887 * For each step, the core calls the subdriver start_power_step() first.
888 * This can return:
889 * - ide_stopped : In this case, the core calls us back again unless
890 * step have been set to ide_power_state_completed.
891 * - ide_started : In this case, the channel is left busy until an
892 * async event (interrupt) occurs.
893 * Typically, start_power_step() will issue a taskfile request with
894 * do_rw_taskfile().
895 *
896 * Upon reception of the interrupt, the core will call complete_power_step()
897 * with the error code if any. This routine should update the step value
898 * and return. It should not start a new request. The core will call
899 * start_power_step for the new step value, unless step have been set to
900 * ide_power_state_completed.
901 *
902 * Subdrivers are expected to define their own additional power
903 * steps from 1..999 for suspend and from 1001..1999 for resume,
904 * other values are reserved for future use.
905 */
906
907enum {
908 ide_pm_state_completed = -1,
909 ide_pm_state_start_suspend = 0,
910 ide_pm_state_start_resume = 1000,
911};
912
913/*
914 * Subdrivers support.
4ef3b8f4
LR		 915 *
916 * The gendriver.owner field should be set to the module owner of this driver.
917 * The gendriver.name field should be set to the name of this driver
1da177e4 918 */
7662d046 919struct ide_driver_s {
1da177e4
LT		 920 const char *version;
921 u8 media;
1da177e4
LT		 922 ide_startstop_t (*do_request)(ide_drive_t *, struct request *, sector_t);
923 int (*end_request)(ide_drive_t *, int, int);
924 ide_startstop_t (*error)(ide_drive_t *, struct request *rq, u8, u8);
1da177e4 925 struct device_driver gen_driver;
4031bbe4
RK		 926 int (*probe)(ide_drive_t *);
927 void (*remove)(ide_drive_t *);
0d2157f7 928 void (*resume)(ide_drive_t *);
4031bbe4 929 void (*shutdown)(ide_drive_t *);
7662d046
BZ		 930#ifdef CONFIG_IDE_PROC_FS
931 ide_proc_entry_t *proc;
8185d5aa 932 const struct ide_devset **settings;
7662d046
BZ		 933#endif
934};
1da177e4 935
4031bbe4
RK		 936#define to_ide_driver(drv) container_of(drv, ide_driver_t, gen_driver)
937
08da591e
BZ		 938int ide_device_get(ide_drive_t *);
939void ide_device_put(ide_drive_t *);
940
aa768773
BZ		 941struct ide_ioctl_devset {
942 unsigned int get_ioctl;
943 unsigned int set_ioctl;
944
945 int (*get)(ide_drive_t *);
946 int (*set)(ide_drive_t *, int);
947};
948
949int ide_setting_ioctl(ide_drive_t *, struct block_device *, unsigned int,
950 unsigned long, const struct ide_ioctl_devset *);
951
952int generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *,
953 unsigned, unsigned long);
1da177e4 954
ebae41a5
BZ		 955extern int ide_vlb_clk;
956extern int ide_pci_clk;
957
1da177e4 958extern int ide_end_request (ide_drive_t *drive, int uptodate, int nrsecs);
dbe217af
AC		 959int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
960 int uptodate, int nr_sectors);
1da177e4 961
1da177e4
LT		 962extern void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry);
963
cd2a2d96
BZ		 964void ide_execute_command(ide_drive_t *, u8, ide_handler_t *, unsigned int,
965 ide_expiry_t *);
1da177e4 966
1fc14258
BZ		 967void ide_execute_pkt_cmd(ide_drive_t *);
968
9f87abe8
BZ		 969void ide_pad_transfer(ide_drive_t *, int, int);
970
1da177e4
LT		 971ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);
972
1da177e4
LT		 973ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);
974
4dde4492 975void ide_fix_driveid(u16 *);
01745112 976
1da177e4
LT		 977extern void ide_fixstring(u8 *, const int, const int);
978
b163f46d
BZ		 979int ide_busy_sleep(ide_hwif_t *, unsigned long, int);
980
74af21cf 981int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);
1da177e4 982
1da177e4
LT		 983extern ide_startstop_t ide_do_reset (ide_drive_t *);
984
63f5abb0 985extern void ide_do_drive_cmd(ide_drive_t *, struct request *);
1da177e4 986
1da177e4
LT		 987extern void ide_end_drive_cmd(ide_drive_t *, u8, u8);
988
9e42237f
BZ		 989enum {
990 IDE_TFLAG_LBA48 = (1 << 0),
74095a91
BZ		 991 IDE_TFLAG_FLAGGED = (1 << 2),
992 IDE_TFLAG_OUT_DATA = (1 << 3),
993 IDE_TFLAG_OUT_HOB_FEATURE = (1 << 4),
994 IDE_TFLAG_OUT_HOB_NSECT = (1 << 5),
995 IDE_TFLAG_OUT_HOB_LBAL = (1 << 6),
996 IDE_TFLAG_OUT_HOB_LBAM = (1 << 7),
997 IDE_TFLAG_OUT_HOB_LBAH = (1 << 8),
998 IDE_TFLAG_OUT_HOB = IDE_TFLAG_OUT_HOB_FEATURE |
999 IDE_TFLAG_OUT_HOB_NSECT |
1000 IDE_TFLAG_OUT_HOB_LBAL |
1001 IDE_TFLAG_OUT_HOB_LBAM |
1002 IDE_TFLAG_OUT_HOB_LBAH,
1003 IDE_TFLAG_OUT_FEATURE = (1 << 9),
1004 IDE_TFLAG_OUT_NSECT = (1 << 10),
1005 IDE_TFLAG_OUT_LBAL = (1 << 11),
1006 IDE_TFLAG_OUT_LBAM = (1 << 12),
1007 IDE_TFLAG_OUT_LBAH = (1 << 13),
1008 IDE_TFLAG_OUT_TF = IDE_TFLAG_OUT_FEATURE |
1009 IDE_TFLAG_OUT_NSECT |
1010 IDE_TFLAG_OUT_LBAL |
1011 IDE_TFLAG_OUT_LBAM |
1012 IDE_TFLAG_OUT_LBAH,
807e35d6 1013 IDE_TFLAG_OUT_DEVICE = (1 << 14),
ac026ff2 1014 IDE_TFLAG_WRITE = (1 << 15),
866e2ec9
BZ		 1015 IDE_TFLAG_FLAGGED_SET_IN_FLAGS = (1 << 16),
1016 IDE_TFLAG_IN_DATA = (1 << 17),
57d7366b 1017 IDE_TFLAG_CUSTOM_HANDLER = (1 << 18),
f6e29e35 1018 IDE_TFLAG_DMA_PIO_FALLBACK = (1 << 19),
c2b57cdc
BZ		 1019 IDE_TFLAG_IN_HOB_FEATURE = (1 << 20),
1020 IDE_TFLAG_IN_HOB_NSECT = (1 << 21),
1021 IDE_TFLAG_IN_HOB_LBAL = (1 << 22),
1022 IDE_TFLAG_IN_HOB_LBAM = (1 << 23),
1023 IDE_TFLAG_IN_HOB_LBAH = (1 << 24),
1024 IDE_TFLAG_IN_HOB_LBA = IDE_TFLAG_IN_HOB_LBAL |
1025 IDE_TFLAG_IN_HOB_LBAM |
1026 IDE_TFLAG_IN_HOB_LBAH,
1027 IDE_TFLAG_IN_HOB = IDE_TFLAG_IN_HOB_FEATURE |
1028 IDE_TFLAG_IN_HOB_NSECT |
1029 IDE_TFLAG_IN_HOB_LBA,
92eb4380 1030 IDE_TFLAG_IN_FEATURE = (1 << 1),
c2b57cdc
BZ		 1031 IDE_TFLAG_IN_NSECT = (1 << 25),
1032 IDE_TFLAG_IN_LBAL = (1 << 26),
1033 IDE_TFLAG_IN_LBAM = (1 << 27),
1034 IDE_TFLAG_IN_LBAH = (1 << 28),
1035 IDE_TFLAG_IN_LBA = IDE_TFLAG_IN_LBAL |
1036 IDE_TFLAG_IN_LBAM |
1037 IDE_TFLAG_IN_LBAH,
1038 IDE_TFLAG_IN_TF = IDE_TFLAG_IN_NSECT |
1039 IDE_TFLAG_IN_LBA,
1040 IDE_TFLAG_IN_DEVICE = (1 << 29),
657cc1a8
BZ		 1041 IDE_TFLAG_HOB = IDE_TFLAG_OUT_HOB |
1042 IDE_TFLAG_IN_HOB,
1043 IDE_TFLAG_TF = IDE_TFLAG_OUT_TF |
1044 IDE_TFLAG_IN_TF,
1045 IDE_TFLAG_DEVICE = IDE_TFLAG_OUT_DEVICE |
1046 IDE_TFLAG_IN_DEVICE,
35cf2b94
TH		 1047 /* force 16-bit I/O operations */
1048 IDE_TFLAG_IO_16BIT = (1 << 30),
395d8ef5
BZ		 1049 /* ide_task_t was allocated using kmalloc() */
1050 IDE_TFLAG_DYN = (1 << 31),
9e42237f
BZ		 1051};
1052
650d841d
BZ		 1053struct ide_taskfile {
1054 u8 hob_data; /* 0: high data byte (for TASKFILE IOCTL) */
1055
1056 u8 hob_feature; /* 1-5: additional data to support LBA48 */
1057 u8 hob_nsect;
1058 u8 hob_lbal;
1059 u8 hob_lbam;
1060 u8 hob_lbah;
1061
1062 u8 data; /* 6: low data byte (for TASKFILE IOCTL) */
1063
1064 union { /*  7: */
1065 u8 error; /* read: error */
1066 u8 feature; /* write: feature */
1067 };
1068
1069 u8 nsect; /* 8: number of sectors */
1070 u8 lbal; /* 9: LBA low */
1071 u8 lbam; /* 10: LBA mid */
1072 u8 lbah; /* 11: LBA high */
1073
1074 u8 device; /* 12: device select */
1075
1076 union { /* 13: */
1077 u8 status; /*  read: status  */
1078 u8 command; /* write: command */
1079 };
1080};
1081
1da177e4 1082typedef struct ide_task_s {
650d841d
BZ		 1083 union {
1084 struct ide_taskfile tf;
1085 u8 tf_array[14];
1086 };
866e2ec9 1087 u32 tf_flags;
1da177e4 1088 int data_phase;
1da177e4
LT		 1089 struct request *rq; /* copy of request */
1090 void *special; /* valid_t generally */
1091} ide_task_t;
1092
089c5c7e 1093void ide_tf_dump(const char *, struct ide_taskfile *);
1da177e4 1094
374e042c
BZ		 1095void ide_exec_command(ide_hwif_t *, u8);
1096u8 ide_read_status(ide_hwif_t *);
1097u8 ide_read_altstatus(ide_hwif_t *);
1098u8 ide_read_sff_dma_status(ide_hwif_t *);
1099
1100void ide_set_irq(ide_hwif_t *, int);
1101
1102void ide_tf_load(ide_drive_t *, ide_task_t *);
1103void ide_tf_read(ide_drive_t *, ide_task_t *);
1104
1105void ide_input_data(ide_drive_t *, struct request *, void *, unsigned int);
1106void ide_output_data(ide_drive_t *, struct request *, void *, unsigned int);
1107
acaa0f5f
BZ		 1108int ide_io_buffers(ide_drive_t *, struct ide_atapi_pc *, unsigned int, int);
1109
1da177e4 1110extern void SELECT_DRIVE(ide_drive_t *);
ed4af48f 1111void SELECT_MASK(ide_drive_t *, int);
1da177e4 1112
92eb4380 1113u8 ide_read_error(ide_drive_t *);
1823649b 1114void ide_read_bcount_and_ireason(ide_drive_t *, u16 *, u8 *);
92eb4380 1115
1da177e4 1116extern int drive_is_ready(ide_drive_t *);
1da177e4 1117
2fc57388
BZ		 1118void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);
1119
51509eec
BZ		 1120int ide_check_atapi_device(ide_drive_t *, const char *);
1121
7bf7420a
BZ		 1122void ide_init_pc(struct ide_atapi_pc *);
1123
7645c151
BZ		 1124/*
1125 * Special requests for ide-tape block device strategy routine.
1126 *
1127 * In order to service a character device command, we add special requests to
1128 * the tail of our block device request queue and wait for their completion.
1129 */
1130enum {
1131 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
1132 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
1133 REQ_IDETAPE_READ = (1 << 2),
1134 REQ_IDETAPE_WRITE = (1 << 3),
1135};
1136
1137void ide_queue_pc_head(ide_drive_t *, struct gendisk *, struct ide_atapi_pc *,
1138 struct request *);
2ac07d92 1139int ide_queue_pc_tail(ide_drive_t *, struct gendisk *, struct ide_atapi_pc *);
7645c151 1140
646c0cb6
BZ		 1141ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
1142 ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
1143 void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
1144 void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
acaa0f5f 1145 int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,
646c0cb6 1146 int));
594c16d8
BZ		 1147ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,
1148 ide_handler_t *, unsigned int, ide_expiry_t *);
6bf1641c
BZ		 1149ide_startstop_t ide_issue_pc(ide_drive_t *, struct ide_atapi_pc *,
1150 ide_handler_t *, unsigned int, ide_expiry_t *);
594c16d8 1151
f6e29e35 1152ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
1da177e4 1153
4d7a984b
TH		 1154void task_end_request(ide_drive_t *, struct request *, u8);
1155
ac026ff2 1156int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *, u16);
9a3c49be
BZ		 1157int ide_no_data_taskfile(ide_drive_t *, ide_task_t *);
1158
1da177e4 1159int ide_taskfile_ioctl(ide_drive_t *, unsigned int, unsigned long);
1da177e4 1160
1da177e4 1161extern int ide_driveid_update(ide_drive_t *);
1da177e4
LT		 1162extern int ide_config_drive_speed(ide_drive_t *, u8);
1163extern u8 eighty_ninty_three (ide_drive_t *);
1da177e4
LT		 1164extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *);
1165
1166extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout);
1167
1da177e4
LT		 1168extern void ide_stall_queue(ide_drive_t *drive, unsigned long timeout);
1169
1170extern int ide_spin_wait_hwgroup(ide_drive_t *);
1171extern void ide_timer_expiry(unsigned long);
7d12e780 1172extern irqreturn_t ide_intr(int irq, void *dev_id);
165125e1 1173extern void do_ide_request(struct request_queue *);
1da177e4
LT		 1174
1175void ide_init_disk(struct gendisk *, ide_drive_t *);
1176
6d208b39 1177#ifdef CONFIG_IDEPCI_PCIBUS_ORDER
725522b5
GKH		 1178extern int __ide_pci_register_driver(struct pci_driver *driver, struct module *owner, const char *mod_name);
1179#define ide_pci_register_driver(d) __ide_pci_register_driver(d, THIS_MODULE, KBUILD_MODNAME)
6d208b39
BZ		 1180#else
1181#define ide_pci_register_driver(d) pci_register_driver(d)
1182#endif
1183
c97c6aca 1184void ide_pci_setup_ports(struct pci_dev *, const struct ide_port_info *, int,
48c3c107 1185 hw_regs_t *, hw_regs_t **);
85620436 1186void ide_setup_pci_noise(struct pci_dev *, const struct ide_port_info *);
1da177e4 1187
8e882ba1 1188#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
b123f56e
BZ		 1189int ide_pci_set_master(struct pci_dev *, const char *);
1190unsigned long ide_pci_dma_base(ide_hwif_t *, const struct ide_port_info *);
ebb00fb5 1191int ide_pci_check_simplex(ide_hwif_t *, const struct ide_port_info *);
b123f56e 1192int ide_hwif_setup_dma(ide_hwif_t *, const struct ide_port_info *);
c413b9b9 1193#else
b123f56e
BZ		 1194static inline int ide_hwif_setup_dma(ide_hwif_t *hwif,
1195 const struct ide_port_info *d)
1196{
1197 return -EINVAL;
1198}
c413b9b9
BZ		 1199#endif
1200
1da177e4
LT		 1201typedef struct ide_pci_enablebit_s {
1202 u8 reg; /* byte pci reg holding the enable-bit */
1203 u8 mask; /* mask to isolate the enable-bit */
1204 u8 val; /* value of masked reg when "enabled" */
1205} ide_pci_enablebit_t;
1206
1207enum {
1208 /* Uses ISA control ports not PCI ones. */
a5d8c5c8 1209 IDE_HFLAG_ISA_PORTS = (1 << 0),
6a824c92 1210 /* single port device */
a5d8c5c8 1211 IDE_HFLAG_SINGLE = (1 << 1),
6a824c92
BZ		 1212 /* don't use legacy PIO blacklist */
1213 IDE_HFLAG_PIO_NO_BLACKLIST = (1 << 2),
e277f91f
BZ		 1214 /* set for the second port of QD65xx */
1215 IDE_HFLAG_QD_2ND_PORT = (1 << 3),
26bcb879
BZ		 1216 /* use PIO8/9 for prefetch off/on */
1217 IDE_HFLAG_ABUSE_PREFETCH = (1 << 4),
1218 /* use PIO6/7 for fast-devsel off/on */
1219 IDE_HFLAG_ABUSE_FAST_DEVSEL = (1 << 5),
1220 /* use 100-102 and 200-202 PIO values to set DMA modes */
1221 IDE_HFLAG_ABUSE_DMA_MODES = (1 << 6),
aedea591
BZ		 1222 /*
1223 * keep DMA setting when programming PIO mode, may be used only
1224 * for hosts which have separate PIO and DMA timings (ie. PMAC)
1225 */
1226 IDE_HFLAG_SET_PIO_MODE_KEEP_DMA = (1 << 7),
88b2b32b
BZ		 1227 /* program host for the transfer mode after programming device */
1228 IDE_HFLAG_POST_SET_MODE = (1 << 8),
1229 /* don't program host/device for the transfer mode ("smart" hosts) */
1230 IDE_HFLAG_NO_SET_MODE = (1 << 9),
0ae2e178
BZ		 1231 /* trust BIOS for programming chipset/device for DMA */
1232 IDE_HFLAG_TRUST_BIOS_FOR_DMA = (1 << 10),
cafa027b
BZ		 1233 /* host is CS5510/CS5520 */
1234 IDE_HFLAG_CS5520 = (1 << 11),
33c1002e
BZ		 1235 /* ATAPI DMA is unsupported */
1236 IDE_HFLAG_NO_ATAPI_DMA = (1 << 12),
5e71d9c5
BZ		 1237 /* set if host is a "non-bootable" controller */
1238 IDE_HFLAG_NON_BOOTABLE = (1 << 13),
47b68788
BZ		 1239 /* host doesn't support DMA */
1240 IDE_HFLAG_NO_DMA = (1 << 14),
1241 /* check if host is PCI IDE device before allowing DMA */
1242 IDE_HFLAG_NO_AUTODMA = (1 << 15),
c5dd43ec
BZ		 1243 /* host uses MMIO */
1244 IDE_HFLAG_MMIO = (1 << 16),
238e4f14
BZ		 1245 /* no LBA48 */
1246 IDE_HFLAG_NO_LBA48 = (1 << 17),
1247 /* no LBA48 DMA */
1248 IDE_HFLAG_NO_LBA48_DMA = (1 << 18),
ed67b923
BZ		 1249 /* data FIFO is cleared by an error */
1250 IDE_HFLAG_ERROR_STOPS_FIFO = (1 << 19),
1c51361a
BZ		 1251 /* serialize ports */
1252 IDE_HFLAG_SERIALIZE = (1 << 20),
3985ee3b
BZ		 1253 /* use legacy IRQs */
1254 IDE_HFLAG_LEGACY_IRQS = (1 << 21),
8acf28c0
BZ		 1255 /* force use of legacy IRQs */
1256 IDE_HFLAG_FORCE_LEGACY_IRQS = (1 << 22),
272a3709
BZ		 1257 /* limit LBA48 requests to 256 sectors */
1258 IDE_HFLAG_RQSIZE_256 = (1 << 23),
caea7602
BZ		 1259 /* use 32-bit I/O ops */
1260 IDE_HFLAG_IO_32BIT = (1 << 24),
1261 /* unmask IRQs */
1262 IDE_HFLAG_UNMASK_IRQS = (1 << 25),
1fd18905
BZ		 1263 /* serialize ports if DMA is possible (for sl82c105) */
1264 IDE_HFLAG_SERIALIZE_DMA = (1 << 27),
8ac2b42a
BZ		 1265 /* force host out of "simplex" mode */
1266 IDE_HFLAG_CLEAR_SIMPLEX = (1 << 28),
4166c199
BZ		 1267 /* DSC overlap is unsupported */
1268 IDE_HFLAG_NO_DSC = (1 << 29),
807b90d0
BZ		 1269 /* never use 32-bit I/O ops */
1270 IDE_HFLAG_NO_IO_32BIT = (1 << 30),
1271 /* never unmask IRQs */
1272 IDE_HFLAG_NO_UNMASK_IRQS = (1 << 31),
1da177e4
LT		 1273};
1274
7cab14a7 1275#ifdef CONFIG_BLK_DEV_OFFBOARD
7cab14a7 1276# define IDE_HFLAG_OFF_BOARD 0
5e71d9c5
BZ		 1277#else
1278# define IDE_HFLAG_OFF_BOARD IDE_HFLAG_NON_BOOTABLE
7cab14a7
BZ		 1279#endif
1280
039788e1 1281struct ide_port_info {
1da177e4 1282 char *name;
a326b02b 1283 unsigned int (*init_chipset)(struct pci_dev *);
1da177e4
LT		 1284 void (*init_iops)(ide_hwif_t *);
1285 void (*init_hwif)(ide_hwif_t *);
b123f56e
BZ		 1286 int (*init_dma)(ide_hwif_t *,
1287 const struct ide_port_info *);
ac95beed 1288
374e042c 1289 const struct ide_tp_ops *tp_ops;
ac95beed 1290 const struct ide_port_ops *port_ops;
f37afdac 1291 const struct ide_dma_ops *dma_ops;
ac95beed 1292
1da177e4 1293 ide_pci_enablebit_t enablebits[2];
528a572d 1294 hwif_chipset_t chipset;
9ffcf364 1295 u32 host_flags;
4099d143 1296 u8 pio_mask;
5f8b6c34
BZ		 1297 u8 swdma_mask;
1298 u8 mwdma_mask;
18137207 1299 u8 udma_mask;
039788e1 1300};
1da177e4 1301
6cdf6eb3
BZ		 1302int ide_pci_init_one(struct pci_dev *, const struct ide_port_info *, void *);
1303int ide_pci_init_two(struct pci_dev *, struct pci_dev *,
1304 const struct ide_port_info *, void *);
ef0b0427 1305void ide_pci_remove(struct pci_dev *);
1da177e4 1306
feb22b7f
BZ		 1307#ifdef CONFIG_PM
1308int ide_pci_suspend(struct pci_dev *, pm_message_t);
1309int ide_pci_resume(struct pci_dev *);
1310#else
1311#define ide_pci_suspend NULL
1312#define ide_pci_resume NULL
1313#endif
1314
1da177e4
LT		 1315void ide_map_sg(ide_drive_t *, struct request *);
1316void ide_init_sg_cmd(ide_drive_t *, struct request *);
1317
1318#define BAD_DMA_DRIVE 0
1319#define GOOD_DMA_DRIVE 1
1320
65e5f2e3
JC		 1321struct drive_list_entry {
1322 const char *id_model;
1323 const char *id_firmware;
1324};
1325
4dde4492 1326int ide_in_drive_list(u16 *, const struct drive_list_entry *);
a5b7e70d
BZ		 1327
1328#ifdef CONFIG_BLK_DEV_IDEDMA
1da177e4 1329int __ide_dma_bad_drive(ide_drive_t *);
3ab7efe8 1330int ide_id_dma_bug(ide_drive_t *);
7670df73
BZ		 1331
1332u8 ide_find_dma_mode(ide_drive_t *, u8);
1333
1334static inline u8 ide_max_dma_mode(ide_drive_t *drive)
1335{
1336 return ide_find_dma_mode(drive, XFER_UDMA_6);
1337}
1338
4a546e04 1339void ide_dma_off_quietly(ide_drive_t *);
7469aaf6 1340void ide_dma_off(ide_drive_t *);
4a546e04 1341void ide_dma_on(ide_drive_t *);
3608b5d7 1342int ide_set_dma(ide_drive_t *);
578cfa0d 1343void ide_check_dma_crc(ide_drive_t *);
1da177e4
LT		 1344ide_startstop_t ide_dma_intr(ide_drive_t *);
1345
062f9f02
BZ		 1346int ide_build_sglist(ide_drive_t *, struct request *);
1347void ide_destroy_dmatable(ide_drive_t *);
1348
8e882ba1 1349#ifdef CONFIG_BLK_DEV_IDEDMA_SFF
1da177e4 1350extern int ide_build_dmatable(ide_drive_t *, struct request *);
b8e73fba
BZ		 1351int ide_allocate_dma_engine(ide_hwif_t *);
1352void ide_release_dma_engine(ide_hwif_t *);
1da177e4 1353
15ce926a 1354void ide_dma_host_set(ide_drive_t *, int);
1da177e4 1355extern int ide_dma_setup(ide_drive_t *);
f37afdac 1356void ide_dma_exec_cmd(ide_drive_t *, u8);
1da177e4
LT		 1357extern void ide_dma_start(ide_drive_t *);
1358extern int __ide_dma_end(ide_drive_t *);
f37afdac 1359int ide_dma_test_irq(ide_drive_t *);
841d2a9b 1360extern void ide_dma_lost_irq(ide_drive_t *);
c283f5db 1361extern void ide_dma_timeout(ide_drive_t *);
71fc9fcc 1362extern const struct ide_dma_ops sff_dma_ops;
8e882ba1 1363#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */
1da177e4
LT		 1364
1365#else
3ab7efe8 1366static inline int ide_id_dma_bug(ide_drive_t *drive) { return 0; }
7670df73 1367static inline u8 ide_find_dma_mode(ide_drive_t *drive, u8 speed) { return 0; }
2d5eaa6d 1368static inline u8 ide_max_dma_mode(ide_drive_t *drive) { return 0; }
4a546e04 1369static inline void ide_dma_off_quietly(ide_drive_t *drive) { ; }
7469aaf6 1370static inline void ide_dma_off(ide_drive_t *drive) { ; }
4a546e04 1371static inline void ide_dma_on(ide_drive_t *drive) { ; }
1da177e4 1372static inline void ide_dma_verbose(ide_drive_t *drive) { ; }
3608b5d7 1373static inline int ide_set_dma(ide_drive_t *drive) { return 1; }
578cfa0d 1374static inline void ide_check_dma_crc(ide_drive_t *drive) { ; }
1da177e4
LT		 1375#endif /* CONFIG_BLK_DEV_IDEDMA */
1376
8e882ba1 1377#ifndef CONFIG_BLK_DEV_IDEDMA_SFF
0d1bad21 1378static inline void ide_release_dma_engine(ide_hwif_t *hwif) { ; }
1da177e4
LT		 1379#endif
1380
e3a59b4d
HR		 1381#ifdef CONFIG_BLK_DEV_IDEACPI
1382extern int ide_acpi_exec_tfs(ide_drive_t *drive);
1383extern void ide_acpi_get_timing(ide_hwif_t *hwif);
1384extern void ide_acpi_push_timing(ide_hwif_t *hwif);
1385extern void ide_acpi_init(ide_hwif_t *hwif);
eafd88a3 1386void ide_acpi_port_init_devices(ide_hwif_t *);
5e32132b 1387extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);
e3a59b4d
HR		 1388#else
1389static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }
1390static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }
1391static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }
1392static inline void ide_acpi_init(ide_hwif_t *hwif) { ; }
eafd88a3 1393static inline void ide_acpi_port_init_devices(ide_hwif_t *hwif) { ; }
5e32132b 1394static inline void ide_acpi_set_state(ide_hwif_t *hwif, int on) {}
e3a59b4d
HR		 1395#endif
1396
fbd13088 1397void ide_remove_port_from_hwgroup(ide_hwif_t *);
387750c3 1398void ide_unregister(ide_hwif_t *);
1da177e4
LT		 1399
1400void ide_register_region(struct gendisk *);
1401void ide_unregister_region(struct gendisk *);
1402
f01393e4 1403void ide_undecoded_slave(ide_drive_t *);
1da177e4 1404
9fd91d95
BZ		 1405void ide_port_apply_params(ide_hwif_t *);
1406
48c3c107
BZ		 1407struct ide_host *ide_host_alloc_all(const struct ide_port_info *, hw_regs_t **);
1408struct ide_host *ide_host_alloc(const struct ide_port_info *, hw_regs_t **);
8a69580e 1409void ide_host_free(struct ide_host *);
48c3c107
BZ		 1410int ide_host_register(struct ide_host *, const struct ide_port_info *,
1411 hw_regs_t **);
6f904d01
BZ		 1412int ide_host_add(const struct ide_port_info *, hw_regs_t **,
1413 struct ide_host **);
48c3c107 1414void ide_host_remove(struct ide_host *);
0bfeee7d 1415int ide_legacy_device_add(const struct ide_port_info *, unsigned long);
2dde7861
BZ		 1416void ide_port_unregister_devices(ide_hwif_t *);
1417void ide_port_scan(ide_hwif_t *);
1da177e4
LT		 1418
1419static inline void *ide_get_hwifdata (ide_hwif_t * hwif)
1420{
1421 return hwif->hwif_data;
1422}
1423
1424static inline void ide_set_hwifdata (ide_hwif_t * hwif, void *data)
1425{
1426 hwif->hwif_data = data;
1427}
1428
3ab7efe8 1429const char *ide_xfer_verbose(u8 mode);
1da177e4
LT		 1430extern void ide_toggle_bounce(ide_drive_t *drive, int on);
1431extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);
1432
a501633c 1433u64 ide_get_lba_addr(struct ide_taskfile *, int);
1da177e4
LT		 1434u8 ide_dump_status(ide_drive_t *, const char *, u8);
1435
3be53f3f
BZ		 1436struct ide_timing {
1437 u8 mode;
1438 u8 setup; /* t1 */
1439 u16 act8b; /* t2 for 8-bit io */
1440 u16 rec8b; /* t2i for 8-bit io */
1441 u16 cyc8b; /* t0 for 8-bit io */
1442 u16 active; /* t2 or tD */
1443 u16 recover; /* t2i or tK */
1444 u16 cycle; /* t0 */
1445 u16 udma; /* t2CYCTYP/2 */
1446};
1447
1448enum {
1449 IDE_TIMING_SETUP = (1 << 0),
1450 IDE_TIMING_ACT8B = (1 << 1),
1451 IDE_TIMING_REC8B = (1 << 2),
1452 IDE_TIMING_CYC8B = (1 << 3),
1453 IDE_TIMING_8BIT = IDE_TIMING_ACT8B | IDE_TIMING_REC8B |
1454 IDE_TIMING_CYC8B,
1455 IDE_TIMING_ACTIVE = (1 << 4),
1456 IDE_TIMING_RECOVER = (1 << 5),
1457 IDE_TIMING_CYCLE = (1 << 6),
1458 IDE_TIMING_UDMA = (1 << 7),
1459 IDE_TIMING_ALL = IDE_TIMING_SETUP | IDE_TIMING_8BIT |
1460 IDE_TIMING_ACTIVE | IDE_TIMING_RECOVER |
1461 IDE_TIMING_CYCLE | IDE_TIMING_UDMA,
1462};
1463
f06ab340 1464struct ide_timing *ide_timing_find_mode(u8);
c9d6c1a2 1465u16 ide_pio_cycle_time(ide_drive_t *, u8);
f06ab340
BZ		 1466void ide_timing_merge(struct ide_timing *, struct ide_timing *,
1467 struct ide_timing *, unsigned int);
1468int ide_timing_compute(ide_drive_t *, u8, struct ide_timing *, int, int);
1469
9ad54093
BZ		 1470int ide_scan_pio_blacklist(char *);
1471
2134758d 1472u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
1da177e4 1473
88b2b32b
BZ		 1474int ide_set_pio_mode(ide_drive_t *, u8);
1475int ide_set_dma_mode(ide_drive_t *, u8);
1476
26bcb879
BZ		 1477void ide_set_pio(ide_drive_t *, u8);
1478
1479static inline void ide_set_max_pio(ide_drive_t *drive)
1480{
1481 ide_set_pio(drive, 255);
1482}
1da177e4
LT		 1483
1484extern spinlock_t ide_lock;
ef29888e 1485extern struct mutex ide_cfg_mtx;
1da177e4
LT		 1486/*
1487 * Structure locking:
1488 *
ef29888e 1489 * ide_cfg_mtx and ide_lock together protect changes to
1da177e4
LT		 1490 * ide_hwif_t->{next,hwgroup}
1491 * ide_drive_t->next
1492 *
1493 * ide_hwgroup_t->busy: ide_lock
1494 * ide_hwgroup_t->hwif: ide_lock
1495 * ide_hwif_t->mate: constant, no locking
1496 * ide_drive_t->hwif: constant, no locking
1497 */
1498
366c7f55 1499#define local_irq_set(flags) do { local_save_flags((flags)); local_irq_enable_in_hardirq(); } while (0)
1da177e4
LT		 1500
1501extern struct bus_type ide_bus_type;
f74c9141 1502extern struct class *ide_port_class;
1da177e4 1503
7b9f25b5
BZ		 1504static inline void ide_dump_identify(u8 *id)
1505{
1506 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 2, id, 512, 0);
1507}
1508
86b37860
CL		 1509static inline int hwif_to_node(ide_hwif_t *hwif)
1510{
96f80219 1511 return hwif->dev ? dev_to_node(hwif->dev) : -1;
86b37860
CL		 1512}
1513
7e59ea21 1514static inline ide_drive_t *ide_get_pair_dev(ide_drive_t *drive)
1b678347 1515{
7e59ea21 1516 ide_drive_t *peer = &drive->hwif->drives[(drive->dn ^ 1) & 1];
1b678347 1517
7e59ea21 1518 return peer->present ? peer : NULL;
1b678347 1519}
1da177e4 1520#endif /* _IDE_H */
Linux 6.x block layer and io_uring tree(s)