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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_UMC8672 /* 1 to support UMC8672 chipset */
41 #define SUPPORT_UMC8672 1 /* 0 to reduce kernel size */
42 #endif
43 #ifndef SUPPORT_HT6560B /* 1 to support HT6560B chipset */
44 #define SUPPORT_HT6560B 1 /* 0 to reduce kernel size */
45 #endif
46 #ifndef SUPPORT_QD6580 /* 1 to support QD6580 chipset */
47 #define SUPPORT_QD6580 1 /* 0 to reduce kernel size */
48 #endif
49 #ifndef SUPPORT_DTC2278 /* 1 to support DTC2278 chipset */
50 #define SUPPORT_DTC2278 1 /* 0 to reduce kernel size */
51 #ifndef SET_DTC2278_MODE4
52 #define SET_DTC2278_MODE4 0 /* 1 to init primary i/f for PIO mode4 */
53 #endif
54 #endif
55 #ifndef FANCY_STATUS_DUMPS /* 1 for human-readable drive errors */
56 #define FANCY_STATUS_DUMPS 1 /* 0 to reduce kernel size */
57 #endif
58
59 #if defined(CONFIG_BLK_DEV_IDECD) || defined(CONFIG_BLK_DEV_IDETAPE)
60 #define CONFIG_BLK_DEV_IDEATAPI 1
61 #endif
62
63 /*
64 * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
65 */
66 #define IDE_DRIVE_CMD 99 /* (magic) undef to reduce kernel size*/
67
68 /*
69 * "No user-serviceable parts" beyond this point :)
70 *****************************************************************************/
71
72 typedef unsigned char byte; /* used everywhere */
73
74 /*
75 * Probably not wise to fiddle with these
76 */
77 #define ERROR_MAX 8 /* Max read/write errors per sector */
78 #define ERROR_RESET 3 /* Reset controller every 4th retry */
79 #define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
80
81 /*
82 * Ensure that various configuration flags have compatible settings
83 */
84 #ifdef REALLY_SLOW_IO
85 #undef REALLY_FAST_IO
86 #endif
87
88 /*
89 * Definitions for accessing IDE controller registers
90 */
91
92 #define HWIF(drive) ((ide_hwif_t *)drive->hwif)
93 #define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
94
95 #define IDE_DATA_OFFSET (0)
96 #define IDE_ERROR_OFFSET (1)
97 #define IDE_NSECTOR_OFFSET (2)
98 #define IDE_SECTOR_OFFSET (3)
99 #define IDE_LCYL_OFFSET (4)
100 #define IDE_HCYL_OFFSET (5)
101 #define IDE_SELECT_OFFSET (6)
102 #define IDE_STATUS_OFFSET (7)
103 #define IDE_FEATURE_OFFSET IDE_ERROR_OFFSET
104 #define IDE_COMMAND_OFFSET IDE_STATUS_OFFSET
105
106 #define IDE_DATA_REG (HWIF(drive)->io_base+IDE_DATA_OFFSET)
107 #define IDE_ERROR_REG (HWIF(drive)->io_base+IDE_ERROR_OFFSET)
108 #define IDE_NSECTOR_REG (HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
109 #define IDE_SECTOR_REG (HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
110 #define IDE_LCYL_REG (HWIF(drive)->io_base+IDE_LCYL_OFFSET)
111 #define IDE_HCYL_REG (HWIF(drive)->io_base+IDE_HCYL_OFFSET)
112 #define IDE_SELECT_REG (HWIF(drive)->io_base+IDE_SELECT_OFFSET)
113 #define IDE_STATUS_REG (HWIF(drive)->io_base+IDE_STATUS_OFFSET)
114 #define IDE_CONTROL_REG (HWIF(drive)->ctl_port)
115 #define IDE_FEATURE_REG IDE_ERROR_REG
116 #define IDE_COMMAND_REG IDE_STATUS_REG
117 #define IDE_ALTSTATUS_REG IDE_CONTROL_REG
118
119 #ifdef REALLY_FAST_IO
120 #define OUT_BYTE(b,p) outb((b),p)
121 #define IN_BYTE(p) (byte)inb(p)
122 #else
123 #define OUT_BYTE(b,p) outb_p((b),p)
124 #define IN_BYTE(p) (byte)inb_p(p)
125 #endif /* REALLY_FAST_IO */
126
127 #define GET_ERR() IN_BYTE(IDE_ERROR_REG)
128 #define GET_STAT() IN_BYTE(IDE_STATUS_REG)
129 #define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
130 #define BAD_R_STAT (BUSY_STAT | ERR_STAT)
131 #define BAD_W_STAT (BAD_R_STAT | WRERR_STAT)
132 #define BAD_STAT (BAD_R_STAT | DRQ_STAT)
133 #define DRIVE_READY (READY_STAT | SEEK_STAT)
134 #define DATA_READY (DRIVE_READY | DRQ_STAT)
135
136 /*
137 * Some more useful definitions
138 */
139 #define IDE_MAJOR_NAME "ide" /* the same for all i/f; see also genhd.c */
140 #define MAJOR_NAME IDE_MAJOR_NAME
141 #define PARTN_BITS 6 /* number of minor dev bits for partitions */
142 #define PARTN_MASK ((1<<PARTN_BITS)-1) /* a useful bit mask */
143 #define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
144 #define MAX_HWIFS 4 /* an arbitrary, but realistic limit */
145 #define SECTOR_WORDS (512 / 4) /* number of 32bit words per sector */
146
147 /*
148 * Timeouts for various operations:
149 */
150 #define WAIT_DRQ (5*HZ/100) /* 50msec - spec allows up to 20ms */
151 #define WAIT_READY (3*HZ/100) /* 30msec - should be instantaneous */
152 #define WAIT_PIDENTIFY (1*HZ) /* 1sec - should be less than 3ms (?) */
153 #define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
154 #define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
155
156 #ifdef CONFIG_BLK_DEV_IDETAPE
157 #include "ide-tape.h"
158 #endif /* CONFIG_BLK_DEV_IDETAPE */
159
160 #ifdef CONFIG_BLK_DEV_IDECD
161
162 struct atapi_request_sense {
163 unsigned char error_code : 7;
164 unsigned char valid : 1;
165 byte reserved1;
166 unsigned char sense_key : 4;
167 unsigned char reserved2 : 1;
168 unsigned char ili : 1;
169 unsigned char reserved3 : 2;
170 byte info[4];
171 byte sense_len;
172 byte command_info[4];
173 byte asc;
174 byte ascq;
175 byte fru;
176 byte sense_key_specific[3];
177 };
178
179 struct packet_command {
180 char *buffer;
181 int buflen;
182 int stat;
183 struct atapi_request_sense *sense_data;
184 unsigned char c[12];
185 };
186
187 /* Space to hold the disk TOC. */
188
189 #define MAX_TRACKS 99
190 struct atapi_toc_header {
191 unsigned short toc_length;
192 byte first_track;
193 byte last_track;
194 };
195
196 struct atapi_toc_entry {
197 byte reserved1;
198 unsigned control : 4;
199 unsigned adr : 4;
200 byte track;
201 byte reserved2;
202 union {
203 unsigned lba;
204 struct {
205 byte reserved3;
206 byte m;
207 byte s;
208 byte f;
209 } msf;
210 } addr;
211 };
212
213 struct atapi_toc {
214 int last_session_lba;
215 int xa_flag;
216 unsigned capacity;
217 struct atapi_toc_header hdr;
218 struct atapi_toc_entry ent[MAX_TRACKS+1]; /* One extra for the leadout. */
219 };
220
221
222 /* This structure is annoyingly close to, but not identical with,
223 the cdrom_subchnl structure from cdrom.h. */
224 struct atapi_cdrom_subchnl
225 {
226 u_char acdsc_reserved;
227 u_char acdsc_audiostatus;
228 u_short acdsc_length;
229 u_char acdsc_format;
230
231 u_char acdsc_adr: 4;
232 u_char acdsc_ctrl: 4;
233 u_char acdsc_trk;
234 u_char acdsc_ind;
235 union
236 {
237 struct
238 {
239 u_char minute;
240 u_char second;
241 u_char frame;
242 } msf;
243 int lba;
244 } acdsc_absaddr;
245 union
246 {
247 struct
248 {
249 u_char minute;
250 u_char second;
251 u_char frame;
252 } msf;
253 int lba;
254 } acdsc_reladdr;
255 };
256
257
258 /* Extra per-device info for cdrom drives. */
259 struct cdrom_info {
260
261 /* Buffer for table of contents. NULL if we haven't allocated
262 a TOC buffer for this device yet. */
263
264 struct atapi_toc *toc;
265
266 /* Sector buffer. If a read request wants only the first part of a cdrom
267 block, we cache the rest of the block here, in the expectation that that
268 data is going to be wanted soon. SECTOR_BUFFERED is the number of the
269 first buffered sector, and NSECTORS_BUFFERED is the number of sectors
270 in the buffer. Before the buffer is allocated, we should have
271 SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
272
273 unsigned long sector_buffered;
274 unsigned long nsectors_buffered;
275 char *sector_buffer;
276
277 /* The result of the last successful request sense command
278 on this device. */
279 struct atapi_request_sense sense_data;
280 };
281
282 #endif /* CONFIG_BLK_DEV_IDECD */
283
284 /*
285 * Now for the data we need to maintain per-drive: ide_drive_t
286 */
287
288 typedef enum {ide_disk, ide_cdrom, ide_tape} ide_media_t;
289
290 typedef union {
291 unsigned all : 8; /* all of the bits together */
292 struct {
293 unsigned set_geometry : 1; /* respecify drive geometry */
294 unsigned recalibrate : 1; /* seek to cyl 0 */
295 unsigned set_multmode : 1; /* set multmode count */
296 unsigned reserved : 5; /* unused */
297 } b;
298 } special_t;
299
300 typedef union {
301 unsigned all : 8; /* all of the bits together */
302 struct {
303 unsigned head : 4; /* always zeros here */
304 unsigned unit : 1; /* drive select number, 0 or 1 */
305 unsigned bit5 : 1; /* always 1 */
306 unsigned lba : 1; /* using LBA instead of CHS */
307 unsigned bit7 : 1; /* always 1 */
308 } b;
309 } select_t;
310
311 typedef struct ide_drive_s {
312 special_t special; /* special action flags */
313 #if FAKE_FDISK_FOR_EZDRIVE
314 unsigned ezdrive : 1; /* flag: partitioned with ezdrive */
315 #endif /* FAKE_FDISK_FOR_EZDRIVE */
316 unsigned present : 1; /* drive is physically present */
317 unsigned noprobe : 1; /* from: hdx=noprobe */
318 unsigned keep_settings : 1; /* restore settings after drive reset */
319 unsigned busy : 1; /* currently doing revalidate_disk() */
320 unsigned vlb_32bit : 1; /* use 32bit in/out for data */
321 unsigned vlb_sync : 1; /* needed for some 32bit chip sets */
322 unsigned removeable : 1; /* 1 if need to do check_media_change */
323 unsigned using_dma : 1; /* disk is using dma for read/write */
324 unsigned unmask : 1; /* flag: okay to unmask other irqs */
325 ide_media_t media; /* disk, cdrom, tape */
326 select_t select; /* basic drive/head select reg value */
327 void *hwif; /* actually (ide_hwif_t *) */
328 byte ctl; /* "normal" value for IDE_CONTROL_REG */
329 byte ready_stat; /* min status value for drive ready */
330 byte mult_count; /* current multiple sector setting */
331 byte mult_req; /* requested multiple sector setting */
332 byte chipset; /* interface chipset access method */
333 byte bad_wstat; /* used for ignoring WRERR_STAT */
334 byte sect0; /* offset of first sector for DM6:DDO */
335 byte usage; /* current "open()" count for drive */
336 byte head; /* "real" number of heads */
337 byte sect; /* "real" sectors per track */
338 byte bios_head; /* BIOS/fdisk/LILO number of heads */
339 byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
340 unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
341 unsigned short cyl; /* "real" number of cyls */
342 struct wait_queue *wqueue; /* used to wait for drive in open() */
343 struct hd_driveid *id; /* drive model identification info */
344 struct hd_struct *part; /* drive partition table */
345 char name[4]; /* drive name, such as "hda" */
346 #ifdef CONFIG_BLK_DEV_IDECD
347 struct cdrom_info cdrom_info; /* from ide-cd.c */
348 #endif /* CONFIG_BLK_DEV_IDECD */
349
350 #ifdef CONFIG_BLK_DEV_IDETAPE /* ide-tape specific data */
351
352 /*
353 * Most of our global data which we need to save even as we leave the
354 * driver due to an interrupt or a timer event is stored here.
355 *
356 * Additional global variables which provide the link between the
357 * character device interface to this structure are defined in
358 * ide-tape.c
359 */
360
361 idetape_tape_t tape;
362
363 #endif /* CONFIG_BLK_DEV_IDETAPE */
364
365 } ide_drive_t;
366
367 /*
368 * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
369 *
370 * The caller is assumed to have selected the drive and programmed the drive's
371 * sector address using CHS or LBA. All that remains is to prepare for DMA
372 * and then issue the actual read/write DMA/PIO command to the drive.
373 *
374 * Returns 0 if all went well.
375 * Returns 1 if DMA read/write could not be started, in which case the caller
376 * should either try again later, or revert to PIO for the current request.
377 */
378 typedef enum {ide_dma_read = 0, ide_dma_write = 1, ide_dma_abort = 2, ide_dma_check = 3} ide_dma_action_t;
379 typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
380
381 typedef struct hwif_s {
382 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
383 void *hwgroup; /* actually (ide_hwgroup_t *) */
384 unsigned short io_base; /* base io port addr */
385 unsigned short ctl_port; /* usually io_base+0x206 */
386 ide_drive_t drives[MAX_DRIVES]; /* drive info */
387 struct gendisk *gd; /* gendisk structure */
388 ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
389 unsigned long *dmatable; /* dma physical region descriptor table */
390 unsigned short dma_base; /* base addr for dma ports (triton) */
391 byte irq; /* our irq number */
392 byte major; /* our major number */
393 byte select; /* pri/sec hwif select for ht6560b */
394 char name[5]; /* name of interface, eg. "ide0" */
395 unsigned noprobe : 1; /* don't probe for this interface */
396 unsigned present : 1; /* this interface exists */
397 unsigned serialized : 1; /* valid only for ide_hwifs[0] */
398 #if (DISK_RECOVERY_TIME > 0)
399 unsigned long last_time; /* time when previous rq was done */
400 #endif
401 #ifdef CONFIG_BLK_DEV_IDECD
402 struct request request_sense_request; /* from ide-cd.c */
403 struct packet_command request_sense_pc; /* from ide-cd.c */
404 #endif /* CONFIG_BLK_DEV_IDECD */
405 #ifdef CONFIG_BLK_DEV_IDETAPE
406 ide_drive_t *tape_drive; /* Pointer to the tape on this interface */
407 #endif /* CONFIG_BLK_DEV_IDETAPE */
408 } ide_hwif_t;
409
410 /*
411 * internal ide interrupt handler type
412 */
413 typedef void (ide_handler_t)(ide_drive_t *);
414
415 typedef struct hwgroup_s {
416 ide_handler_t *handler;/* irq handler, if active */
417 ide_drive_t *drive; /* current drive */
418 ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
419 struct request *rq; /* current request */
420 struct timer_list timer; /* failsafe timer */
421 struct request wrq; /* local copy of current write rq */
422 unsigned long poll_timeout; /* timeout value during long polls */
423 } ide_hwgroup_t;
424
425 /*
426 * One final include file, which references some of the data/defns from above
427 */
428 #define IDE_DRIVER /* "parameter" for blk.h */
429 #include <linux/blk.h>
430
431 #if (DISK_RECOVERY_TIME > 0)
432 void ide_set_recovery_timer (ide_hwif_t *);
433 #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
434 #else
435 #define SET_RECOVERY_TIMER(drive)
436 #endif
437
438 /*
439 * This is used for (nearly) all data transfers from the IDE interface
440 */
441 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
442
443 /*
444 * This is used for (nearly) all data transfers to the IDE interface
445 */
446 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
447
448 /*
449 * This is used on exit from the driver, to designate the next irq handler
450 * and also to start the safety timer.
451 */
452 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
453
454 /*
455 * Error reporting, in human readable form (luxurious, but a memory hog).
456 */
457 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
458
459 /*
460 * ide_error() takes action based on the error returned by the controller.
461 * The calling function must return afterwards, to restart the request.
462 */
463 void ide_error (ide_drive_t *drive, const char *msg, byte stat);
464
465 /*
466 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
467 * removing leading/trailing blanks and compressing internal blanks.
468 * It is primarily used to tidy up the model name/number fields as
469 * returned by the WIN_[P]IDENTIFY commands.
470 */
471 void ide_fixstring (byte *s, const int bytecount, const int byteswap);
472
473 /*
474 * This routine busy-waits for the drive status to be not "busy".
475 * It then checks the status for all of the "good" bits and none
476 * of the "bad" bits, and if all is okay it returns 0. All other
477 * cases return 1 after invoking ide_error() -- caller should return.
478 *
479 */
480 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
481
482 /*
483 * This is called from genhd.c to correct DiskManager/EZ-Drive geometries
484 */
485 int ide_xlate_1024(kdev_t, int, const char *);
486
487 /*
488 * Start a reset operation for an IDE interface.
489 * The caller should return immediately after invoking this.
490 */
491 void ide_do_reset (ide_drive_t *);
492
493 /*
494 * This function is intended to be used prior to invoking ide_do_drive_cmd().
495 */
496 void ide_init_drive_cmd (struct request *rq);
497
498 /*
499 * "action" parameter type for ide_do_drive_cmd() below.
500 */
501 typedef enum
502 {ide_wait, /* insert rq at end of list, and wait for it */
503 ide_next, /* insert rq immediately after current request */
504 ide_preempt, /* insert rq in front of current request */
505 ide_end} /* insert rq at end of list, but don't wait for it */
506 ide_action_t;
507
508 /*
509 * This function issues a special IDE device request
510 * onto the request queue.
511 *
512 * If action is ide_wait, then then rq is queued at the end of
513 * the request queue, and the function sleeps until it has been
514 * processed. This is for use when invoked from an ioctl handler.
515 *
516 * If action is ide_preempt, then the rq is queued at the head of
517 * the request queue, displacing the currently-being-processed
518 * request and this function returns immediately without waiting
519 * for the new rq to be completed. This is VERY DANGEROUS, and is
520 * intended for careful use by the ATAPI tape/cdrom driver code.
521 *
522 * If action is ide_next, then the rq is queued immediately after
523 * the currently-being-processed-request (if any), and the function
524 * returns without waiting for the new rq to be completed. As above,
525 * This is VERY DANGEROUS, and is intended for careful use by the
526 * ATAPI tape/cdrom driver code.
527 *
528 * If action is ide_end, then the rq is queued at the end of the
529 * request queue, and the function returns immediately without waiting
530 * for the new rq to be completed. This is again intended for careful
531 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
532 * when operating in the pipelined operation mode).
533 */
534 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
535
536 /*
537 * Clean up after success/failure of an explicit drive cmd.
538 * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
539 */
540 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
541
542 #ifdef CONFIG_BLK_DEV_IDECD
543 /*
544 * These are routines in ide-cd.c invoked from ide.c
545 */
546 void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
547 int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
548 int ide_cdrom_check_media_change (ide_drive_t *);
549 int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
550 void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
551 void ide_cdrom_setup (ide_drive_t *);
552 #endif /* CONFIG_BLK_DEV_IDECD */
553
554 #ifdef CONFIG_BLK_DEV_IDETAPE
555
556 /*
557 * Functions in ide-tape.c which are invoked from ide.c:
558 */
559
560 /*
561 * idetape_identify_device is called during device probing stage to
562 * probe for an ide atapi tape drive and to initialize global variables
563 * in ide-tape.c which provide the link between the character device
564 * and the correspoding block device.
565 *
566 * Returns 1 if an ide tape was detected and is supported.
567 * Returns 0 otherwise.
568 */
569
570 int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
571
572 /*
573 * idetape_setup is called a bit later than idetape_identify_device,
574 * during the search for disk partitions, to initialize various tape
575 * state variables in ide_drive_t *drive.
576 */
577
578 void idetape_setup (ide_drive_t *drive);
579
580 /*
581 * idetape_do_request is our request function. It is called by ide.c
582 * to process a new request.
583 */
584
585 void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
586
587 /*
588 * Block device interface functions.
589 */
590
591 int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
592 unsigned int cmd, unsigned long arg);
593 int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
594 void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
595
596 /*
597 * idetape_register_chrdev initializes the character device interface to
598 * the ide tape drive.
599 */
600
601 void idetape_register_chrdev (void);
602
603 #endif /* CONFIG_BLK_DEV_IDETAPE */
604
605 #ifdef CONFIG_BLK_DEV_TRITON
606 void ide_init_triton (byte, byte);
607 #endif /* CONFIG_BLK_DEV_TRITON */
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*/