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1 /*
2 * linux/drivers/block/ide.h
3 *
4 * Copyright (C) 1994, 1995 Linus Torvalds & authors
5 */
6
7 #include <linux/config.h>
8
9 /*
10 * This is the multiple IDE interface driver, as evolved from hd.c.
11 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
12 * There can be up to two drives per interface, as per the ATA-2 spec.
13 *
14 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
15 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
16 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
17 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
18 */
19
20 /******************************************************************************
21 * IDE driver configuration options (play with these as desired):
22 *
23 * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
24 */
25 #undef REALLY_FAST_IO /* define if ide ports are perfect */
26 #define INITIAL_MULT_COUNT 0 /* off=0; on=2,4,8,16,32, etc.. */
27
28 #ifndef DISK_RECOVERY_TIME /* off=0; on=access_delay_time */
29 #define DISK_RECOVERY_TIME 0 /* for hardware that needs it */
30 #endif
31 #ifndef OK_TO_RESET_CONTROLLER /* 1 needed for good error recovery */
32 #define OK_TO_RESET_CONTROLLER 1 /* 0 for use with AH2372A/B interface */
33 #endif
34 #ifndef FAKE_FDISK_FOR_EZDRIVE /* 1 to help linux fdisk with EZDRIVE */
35 #define FAKE_FDISK_FOR_EZDRIVE 1 /* 0 to reduce kernel size */
36 #endif
37 #ifndef SUPPORT_RZ1000 /* 1 to support RZ1000 chipset */
38 #define SUPPORT_RZ1000 1 /* 0 to reduce kernel size */
39 #endif
40 #ifndef SUPPORT_CMD640 /* 1 to support CMD640 chipset */
41 #define SUPPORT_CMD640 1 /* 0 to reduce kernel size */
42 #endif
43 #ifndef SUPPORT_UMC8672 /* 1 to support UMC8672 chipset */
44 #define SUPPORT_UMC8672 1 /* 0 to reduce kernel size */
45 #endif
46 #ifndef SUPPORT_HT6560B /* 1 to support HT6560B chipset */
47 #define SUPPORT_HT6560B 1 /* 0 to reduce kernel size */
48 #endif
49 #ifndef SUPPORT_QD6580 /* 1 to support QD6580 chipset */
50 #define SUPPORT_QD6580 1 /* 0 to reduce kernel size */
51 #endif
52 #ifndef SUPPORT_DTC2278 /* 1 to support DTC2278 chipset */
53 #define SUPPORT_DTC2278 1 /* 0 to reduce kernel size */
54 #ifndef SET_DTC2278_MODE4
55 #define SET_DTC2278_MODE4 0 /* 1 to init primary i/f for PIO mode4 */
56 #endif
57 #endif
58 #ifndef FANCY_STATUS_DUMPS /* 1 for human-readable drive errors */
59 #define FANCY_STATUS_DUMPS 1 /* 0 to reduce kernel size */
60 #endif
61
62 /*
63 * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
64 */
65 #define IDE_DRIVE_CMD 99 /* (magic) undef to reduce kernel size*/
66
67 /*
68 * "No user-serviceable parts" beyond this point :)
69 *****************************************************************************/
70
71 typedef unsigned char byte; /* used everywhere */
72
73 /*
74 * Probably not wise to fiddle with these
75 */
76 #define ERROR_MAX 8 /* Max read/write errors per sector */
77 #define ERROR_RESET 3 /* Reset controller every 4th retry */
78 #define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
79
80 /*
81 * Ensure that various configuration flags have compatible settings
82 */
83 #ifdef REALLY_SLOW_IO
84 #undef REALLY_FAST_IO
85 #endif
86
87 /*
88 * Definitions for accessing IDE controller registers
89 */
90
91 #define HWIF(drive) ((ide_hwif_t *)drive->hwif)
92 #define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
93
94 #define IDE_DATA_OFFSET (0)
95 #define IDE_ERROR_OFFSET (1)
96 #define IDE_NSECTOR_OFFSET (2)
97 #define IDE_SECTOR_OFFSET (3)
98 #define IDE_LCYL_OFFSET (4)
99 #define IDE_HCYL_OFFSET (5)
100 #define IDE_SELECT_OFFSET (6)
101 #define IDE_STATUS_OFFSET (7)
102 #define IDE_FEATURE_OFFSET IDE_ERROR_OFFSET
103 #define IDE_COMMAND_OFFSET IDE_STATUS_OFFSET
104
105 #define IDE_DATA_REG (HWIF(drive)->io_base+IDE_DATA_OFFSET)
106 #define IDE_ERROR_REG (HWIF(drive)->io_base+IDE_ERROR_OFFSET)
107 #define IDE_NSECTOR_REG (HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
108 #define IDE_SECTOR_REG (HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
109 #define IDE_LCYL_REG (HWIF(drive)->io_base+IDE_LCYL_OFFSET)
110 #define IDE_HCYL_REG (HWIF(drive)->io_base+IDE_HCYL_OFFSET)
111 #define IDE_SELECT_REG (HWIF(drive)->io_base+IDE_SELECT_OFFSET)
112 #define IDE_STATUS_REG (HWIF(drive)->io_base+IDE_STATUS_OFFSET)
113 #define IDE_CONTROL_REG (HWIF(drive)->ctl_port)
114 #define IDE_FEATURE_REG IDE_ERROR_REG
115 #define IDE_COMMAND_REG IDE_STATUS_REG
116 #define IDE_ALTSTATUS_REG IDE_CONTROL_REG
117
118 #ifdef REALLY_FAST_IO
119 #define OUT_BYTE(b,p) outb((b),p)
120 #define IN_BYTE(p) (byte)inb(p)
121 #else
122 #define OUT_BYTE(b,p) outb_p((b),p)
123 #define IN_BYTE(p) (byte)inb_p(p)
124 #endif /* REALLY_FAST_IO */
125
126 #define GET_ERR() IN_BYTE(IDE_ERROR_REG)
127 #define GET_STAT() IN_BYTE(IDE_STATUS_REG)
128 #define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
129 #define BAD_R_STAT (BUSY_STAT | ERR_STAT)
130 #define BAD_W_STAT (BAD_R_STAT | WRERR_STAT)
131 #define BAD_STAT (BAD_R_STAT | DRQ_STAT)
132 #define DRIVE_READY (READY_STAT | SEEK_STAT)
133 #define DATA_READY (DRIVE_READY | DRQ_STAT)
134
135 /*
136 * Some more useful definitions
137 */
138 #define IDE_MAJOR_NAME "ide" /* the same for all i/f; see also genhd.c */
139 #define MAJOR_NAME IDE_MAJOR_NAME
140 #define PARTN_BITS 6 /* number of minor dev bits for partitions */
141 #define PARTN_MASK ((1<<PARTN_BITS)-1) /* a useful bit mask */
142 #define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
143 #define MAX_HWIFS 4 /* an arbitrary, but realistic limit */
144 #define SECTOR_WORDS (512 / 4) /* number of 32bit words per sector */
145
146 /*
147 * Timeouts for various operations:
148 */
149 #define WAIT_DRQ (5*HZ/100) /* 50msec - spec allows up to 20ms */
150 #define WAIT_READY (3*HZ/100) /* 30msec - should be instantaneous */
151 #define WAIT_PIDENTIFY (1*HZ) /* 1sec - should be less than 3ms (?) */
152 #define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
153 #define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
154
155 #ifdef CONFIG_BLK_DEV_IDETAPE
156 #include "ide-tape.h"
157 #endif /* CONFIG_BLK_DEV_IDETAPE */
158
159 #ifdef CONFIG_BLK_DEV_IDECD
160
161 struct atapi_request_sense {
162 unsigned char error_code : 7;
163 unsigned char valid : 1;
164 byte reserved1;
165 unsigned char sense_key : 4;
166 unsigned char reserved2 : 1;
167 unsigned char ili : 1;
168 unsigned char reserved3 : 2;
169 byte info[4];
170 byte sense_len;
171 byte command_info[4];
172 byte asc;
173 byte ascq;
174 byte fru;
175 byte sense_key_specific[3];
176 };
177
178 struct packet_command {
179 char *buffer;
180 int buflen;
181 int stat;
182 struct atapi_request_sense *sense_data;
183 unsigned char c[12];
184 };
185
186 /* Space to hold the disk TOC. */
187
188 #define MAX_TRACKS 99
189 struct atapi_toc_header {
190 unsigned short toc_length;
191 byte first_track;
192 byte last_track;
193 };
194
195 struct atapi_toc_entry {
196 byte reserved1;
197 unsigned control : 4;
198 unsigned adr : 4;
199 byte track;
200 byte reserved2;
201 union {
202 unsigned lba;
203 struct {
204 byte reserved3;
205 byte m;
206 byte s;
207 byte f;
208 } msf;
209 } addr;
210 };
211
212 struct atapi_toc {
213 int last_session_lba;
214 int xa_flag;
215 unsigned capacity;
216 struct atapi_toc_header hdr;
217 struct atapi_toc_entry ent[MAX_TRACKS+1]; /* One extra for the leadout. */
218 };
219
220
221 /* This structure is annoyingly close to, but not identical with,
222 the cdrom_subchnl structure from cdrom.h. */
223 struct atapi_cdrom_subchnl
224 {
225 u_char acdsc_reserved;
226 u_char acdsc_audiostatus;
227 u_short acdsc_length;
228 u_char acdsc_format;
229
230 u_char acdsc_adr: 4;
231 u_char acdsc_ctrl: 4;
232 u_char acdsc_trk;
233 u_char acdsc_ind;
234 union
235 {
236 struct
237 {
238 u_char minute;
239 u_char second;
240 u_char frame;
241 } msf;
242 int lba;
243 } acdsc_absaddr;
244 union
245 {
246 struct
247 {
248 u_char minute;
249 u_char second;
250 u_char frame;
251 } msf;
252 int lba;
253 } acdsc_reladdr;
254 };
255
256
257 /* Extra per-device info for cdrom drives. */
258 struct cdrom_info {
259
260 /* Buffer for table of contents. NULL if we haven't allocated
261 a TOC buffer for this device yet. */
262
263 struct atapi_toc *toc;
264
265 /* Sector buffer. If a read request wants only the first part of a cdrom
266 block, we cache the rest of the block here, in the expectation that that
267 data is going to be wanted soon. SECTOR_BUFFERED is the number of the
268 first buffered sector, and NSECTORS_BUFFERED is the number of sectors
269 in the buffer. Before the buffer is allocated, we should have
270 SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
271
272 unsigned long sector_buffered;
273 unsigned long nsectors_buffered;
274 char *sector_buffer;
275
276 /* The result of the last successful request sense command
277 on this device. */
278 struct atapi_request_sense sense_data;
279 };
280
281 #endif /* CONFIG_BLK_DEV_IDECD */
282
283 /*
284 * Now for the data we need to maintain per-drive: ide_drive_t
285 */
286
287 typedef enum {ide_disk, ide_cdrom, ide_tape} ide_media_t;
288
289 typedef union {
290 unsigned all : 8; /* all of the bits together */
291 struct {
292 unsigned set_geometry : 1; /* respecify drive geometry */
293 unsigned recalibrate : 1; /* seek to cyl 0 */
294 unsigned set_multmode : 1; /* set multmode count */
295 unsigned reserved : 5; /* unused */
296 } b;
297 } special_t;
298
299 typedef union {
300 unsigned all : 8; /* all of the bits together */
301 struct {
302 unsigned head : 4; /* always zeros here */
303 unsigned unit : 1; /* drive select number, 0 or 1 */
304 unsigned bit5 : 1; /* always 1 */
305 unsigned lba : 1; /* using LBA instead of CHS */
306 unsigned bit7 : 1; /* always 1 */
307 } b;
308 } select_t;
309
310 typedef struct ide_drive_s {
311 special_t special; /* special action flags */
312 #if FAKE_FDISK_FOR_EZDRIVE
313 unsigned ezdrive : 1; /* flag: partitioned with ezdrive */
314 #endif /* FAKE_FDISK_FOR_EZDRIVE */
315 unsigned present : 1; /* drive is physically present */
316 unsigned noprobe : 1; /* from: hdx=noprobe */
317 unsigned keep_settings : 1; /* restore settings after drive reset */
318 unsigned busy : 1; /* currently doing revalidate_disk() */
319 unsigned vlb_32bit : 1; /* use 32bit in/out for data */
320 unsigned vlb_sync : 1; /* needed for some 32bit chip sets */
321 unsigned removeable : 1; /* 1 if need to do check_media_change */
322 unsigned using_dma : 1; /* disk is using dma for read/write */
323 unsigned unmask : 1; /* flag: okay to unmask other irqs */
324 ide_media_t media; /* disk, cdrom, tape */
325 select_t select; /* basic drive/head select reg value */
326 void *hwif; /* actually (ide_hwif_t *) */
327 byte ctl; /* "normal" value for IDE_CONTROL_REG */
328 byte ready_stat; /* min status value for drive ready */
329 byte mult_count; /* current multiple sector setting */
330 byte mult_req; /* requested multiple sector setting */
331 byte chipset; /* interface chipset access method */
332 byte bad_wstat; /* used for ignoring WRERR_STAT */
333 byte sect0; /* offset of first sector for DM6:DDO */
334 byte usage; /* current "open()" count for drive */
335 byte head; /* "real" number of heads */
336 byte sect; /* "real" sectors per track */
337 byte bios_head; /* BIOS/fdisk/LILO number of heads */
338 byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
339 unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
340 unsigned short cyl; /* "real" number of cyls */
341 struct wait_queue *wqueue; /* used to wait for drive in open() */
342 struct hd_driveid *id; /* drive model identification info */
343 struct hd_struct *part; /* drive partition table */
344 char name[4]; /* drive name, such as "hda" */
345 #ifdef CONFIG_BLK_DEV_IDECD
346 struct cdrom_info cdrom_info; /* from ide-cd.c */
347 #endif /* CONFIG_BLK_DEV_IDECD */
348
349 #ifdef CONFIG_BLK_DEV_IDETAPE /* ide-tape specific data */
350
351 /*
352 * Most of our global data which we need to save even as we leave the
353 * driver due to an interrupt or a timer event is stored here.
354 *
355 * Additional global variables which provide the link between the
356 * character device interface to this structure are defined in
357 * ide-tape.c
358 */
359
360 idetape_tape_t tape;
361
362 #endif /* CONFIG_BLK_DEV_IDETAPE */
363
364 } ide_drive_t;
365
366 /*
367 * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
368 *
369 * The caller is assumed to have selected the drive and programmed the drive's
370 * sector address using CHS or LBA. All that remains is to prepare for DMA
371 * and then issue the actual read/write DMA/PIO command to the drive.
372 *
373 * Returns 0 if all went well.
374 * Returns 1 if DMA read/write could not be started, in which case the caller
375 * should either try again later, or revert to PIO for the current request.
376 */
377 typedef enum {ide_dma_read = 0, ide_dma_write = 1, ide_dma_abort = 2, ide_dma_check = 3} ide_dma_action_t;
378 typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
379
380 typedef struct hwif_s {
381 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
382 void *hwgroup; /* actually (ide_hwgroup_t *) */
383 unsigned short io_base; /* base io port addr */
384 unsigned short ctl_port; /* usually io_base+0x206 */
385 ide_drive_t drives[MAX_DRIVES]; /* drive info */
386 struct gendisk *gd; /* gendisk structure */
387 ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
388 unsigned long *dmatable; /* dma physical region descriptor table */
389 unsigned short dma_base; /* base addr for dma ports (triton) */
390 byte irq; /* our irq number */
391 byte major; /* our major number */
392 byte select; /* pri/sec hwif select for ht6560b */
393 char name[5]; /* name of interface, eg. "ide0" */
394 unsigned noprobe : 1; /* don't probe for this interface */
395 unsigned present : 1; /* this interface exists */
396 #if (DISK_RECOVERY_TIME > 0)
397 unsigned long last_time; /* time when previous rq was done */
398 #endif
399 #ifdef CONFIG_BLK_DEV_IDECD
400 struct request request_sense_request; /* from ide-cd.c */
401 struct packet_command request_sense_pc; /* from ide-cd.c */
402 #endif /* CONFIG_BLK_DEV_IDECD */
403 #ifdef CONFIG_BLK_DEV_IDETAPE
404 ide_drive_t *tape_drive; /* Pointer to the tape on this interface */
405 #endif /* CONFIG_BLK_DEV_IDETAPE */
406 } ide_hwif_t;
407
408 /*
409 * internal ide interrupt handler type
410 */
411 typedef void (ide_handler_t)(ide_drive_t *);
412
413 typedef struct hwgroup_s {
414 ide_handler_t *handler;/* irq handler, if active */
415 ide_drive_t *drive; /* current drive */
416 ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
417 struct request *rq; /* current request */
418 struct timer_list timer; /* failsafe timer */
419 struct request wrq; /* local copy of current write rq */
420 unsigned long poll_timeout; /* timeout value during long polls */
421 } ide_hwgroup_t;
422
423 /*
424 * One final include file, which references some of the data/defns from above
425 */
426 #define IDE_DRIVER /* "parameter" for blk.h */
427 #include <linux/blk.h>
428
429 #if (DISK_RECOVERY_TIME > 0)
430 void ide_set_recovery_timer (ide_hwif_t *);
431 #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
432 #else
433 #define SET_RECOVERY_TIMER(drive)
434 #endif
435
436 /*
437 * This is used for (nearly) all data transfers from the IDE interface
438 */
439 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
440
441 /*
442 * This is used for (nearly) all data transfers to the IDE interface
443 */
444 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
445
446 /*
447 * This is used on exit from the driver, to designate the next irq handler
448 * and also to start the safety timer.
449 */
450 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
451
452 /*
453 * Error reporting, in human readable form (luxurious, but a memory hog).
454 */
455 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
456
457 /*
458 * ide_error() takes action based on the error returned by the controller.
459 * The calling function must return afterwards, to restart the request.
460 */
461 void ide_error (ide_drive_t *drive, const char *msg, byte stat);
462
463 /*
464 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
465 * removing leading/trailing blanks and compressing internal blanks.
466 * It is primarily used to tidy up the model name/number fields as
467 * returned by the WIN_[P]IDENTIFY commands.
468 */
469 void ide_fixstring (byte *s, const int bytecount, const int byteswap);
470
471 /*
472 * This routine busy-waits for the drive status to be not "busy".
473 * It then checks the status for all of the "good" bits and none
474 * of the "bad" bits, and if all is okay it returns 0. All other
475 * cases return 1 after invoking ide_error() -- caller should return.
476 *
477 */
478 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
479
480 /*
481 * This is called from genhd.c to correct DiskManager/EZ-Drive geometries
482 */
483 int ide_xlate_1024(kdev_t, int, const char *);
484
485 /*
486 * Start a reset operation for an IDE interface.
487 * The caller should return immediately after invoking this.
488 */
489 void ide_do_reset (ide_drive_t *);
490
491 /*
492 * This function is intended to be used prior to invoking ide_do_drive_cmd().
493 */
494 void ide_init_drive_cmd (struct request *rq);
495
496 /*
497 * "action" parameter type for ide_do_drive_cmd() below.
498 */
499 typedef enum
500 {ide_wait, /* insert rq at end of list, and wait for it */
501 ide_next, /* insert rq immediately after current request */
502 ide_preempt, /* insert rq in front of current request */
503 ide_end} /* insert rq at end of list, but don't wait for it */
504 ide_action_t;
505
506 /*
507 * This function issues a special IDE device request
508 * onto the request queue.
509 *
510 * If action is ide_wait, then then rq is queued at the end of
511 * the request queue, and the function sleeps until it has been
512 * processed. This is for use when invoked from an ioctl handler.
513 *
514 * If action is ide_preempt, then the rq is queued at the head of
515 * the request queue, displacing the currently-being-processed
516 * request and this function returns immediately without waiting
517 * for the new rq to be completed. This is VERY DANGEROUS, and is
518 * intended for careful use by the ATAPI tape/cdrom driver code.
519 *
520 * If action is ide_next, then the rq is queued immediately after
521 * the currently-being-processed-request (if any), and the function
522 * returns without waiting for the new rq to be completed. As above,
523 * This is VERY DANGEROUS, and is intended for careful use by the
524 * ATAPI tape/cdrom driver code.
525 *
526 * If action is ide_end, then the rq is queued at the end of the
527 * request queue, and the function returns immediately without waiting
528 * for the new rq to be completed. This is again intended for careful
529 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
530 * when operating in the pipelined operation mode).
531 */
532 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
533
534 /*
535 * Clean up after success/failure of an explicit drive cmd.
536 * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
537 */
538 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
539
540 #ifdef CONFIG_BLK_DEV_IDECD
541 /*
542 * These are routines in ide-cd.c invoked from ide.c
543 */
544 void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
545 int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
546 int ide_cdrom_check_media_change (ide_drive_t *);
547 int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
548 void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
549 void ide_cdrom_setup (ide_drive_t *);
550 #endif /* CONFIG_BLK_DEV_IDECD */
551
552 #ifdef CONFIG_BLK_DEV_IDETAPE
553
554 /*
555 * Functions in ide-tape.c which are invoked from ide.c:
556 */
557
558 /*
559 * idetape_identify_device is called during device probing stage to
560 * probe for an ide atapi tape drive and to initialize global variables
561 * in ide-tape.c which provide the link between the character device
562 * and the correspoding block device.
563 *
564 * Returns 1 if an ide tape was detected and is supported.
565 * Returns 0 otherwise.
566 */
567
568 int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
569
570 /*
571 * idetape_setup is called a bit later than idetape_identify_device,
572 * during the search for disk partitions, to initialize various tape
573 * state variables in ide_drive_t *drive.
574 */
575
576 void idetape_setup (ide_drive_t *drive);
577
578 /*
579 * idetape_do_request is our request function. It is called by ide.c
580 * to process a new request.
581 */
582
583 void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
584
585 /*
586 * Block device interface functions.
587 */
588
589 int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
590 unsigned int cmd, unsigned long arg);
591 int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
592 void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
593
594 /*
595 * idetape_register_chrdev initializes the character device interface to
596 * the ide tape drive.
597 */
598
599 void idetape_register_chrdev (void);
600
601 /*
602 * The following function is called to re-insert a postponed tape
603 * request into the request queue.
604 */
605
606 void idetape_put_back_postponed_request (ide_drive_t *drive);
607
608 #endif /* CONFIG_BLK_DEV_IDETAPE */
609
610 #ifdef CONFIG_BLK_DEV_TRITON
611 void ide_init_triton (byte, byte);
612 #endif /* CONFIG_BLK_DEV_TRITON */
613
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*/