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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 SUPPORT_VLB_SYNC /* 1 to support weird 32-bit chips */
29 #define SUPPORT_VLB_SYNC 1 /* 0 to reduce kernel size */
30 #endif
31 #ifndef DISK_RECOVERY_TIME /* off=0; on=access_delay_time */
32 #define DISK_RECOVERY_TIME 0 /* for hardware that needs it */
33 #endif
34 #ifndef OK_TO_RESET_CONTROLLER /* 1 needed for good error recovery */
35 #define OK_TO_RESET_CONTROLLER 1 /* 0 for use with AH2372A/B interface */
36 #endif
37 #ifndef FAKE_FDISK_FOR_EZDRIVE /* 1 to help linux fdisk with EZDRIVE */
38 #define FAKE_FDISK_FOR_EZDRIVE 1 /* 0 to reduce kernel size */
39 #endif
40 #ifndef FANCY_STATUS_DUMPS /* 1 for human-readable drive errors */
41 #define FANCY_STATUS_DUMPS 1 /* 0 to reduce kernel size */
42 #endif
43
44 #if defined(CONFIG_BLK_DEV_IDECD) || defined(CONFIG_BLK_DEV_IDETAPE)
45 #define CONFIG_BLK_DEV_IDEATAPI 1
46 #endif
47
48 /*
49 * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
50 */
51 #define IDE_DRIVE_CMD 99 /* (magic) undef to reduce kernel size*/
52
53 /*
54 * "No user-serviceable parts" beyond this point :)
55 *****************************************************************************/
56
57 typedef unsigned char byte; /* used everywhere */
58
59 /*
60 * Probably not wise to fiddle with these
61 */
62 #define ERROR_MAX 8 /* Max read/write errors per sector */
63 #define ERROR_RESET 3 /* Reset controller every 4th retry */
64 #define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
65
66 /*
67 * Ensure that various configuration flags have compatible settings
68 */
69 #ifdef REALLY_SLOW_IO
70 #undef REALLY_FAST_IO
71 #endif
72
73 /*
74 * Definitions for accessing IDE controller registers
75 */
76
77 #define HWIF(drive) ((ide_hwif_t *)drive->hwif)
78 #define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
79
80 #define IDE_DATA_OFFSET (0)
81 #define IDE_ERROR_OFFSET (1)
82 #define IDE_NSECTOR_OFFSET (2)
83 #define IDE_SECTOR_OFFSET (3)
84 #define IDE_LCYL_OFFSET (4)
85 #define IDE_HCYL_OFFSET (5)
86 #define IDE_SELECT_OFFSET (6)
87 #define IDE_STATUS_OFFSET (7)
88 #define IDE_FEATURE_OFFSET IDE_ERROR_OFFSET
89 #define IDE_COMMAND_OFFSET IDE_STATUS_OFFSET
90
91 #define IDE_DATA_REG (HWIF(drive)->io_base+IDE_DATA_OFFSET)
92 #define IDE_ERROR_REG (HWIF(drive)->io_base+IDE_ERROR_OFFSET)
93 #define IDE_NSECTOR_REG (HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
94 #define IDE_SECTOR_REG (HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
95 #define IDE_LCYL_REG (HWIF(drive)->io_base+IDE_LCYL_OFFSET)
96 #define IDE_HCYL_REG (HWIF(drive)->io_base+IDE_HCYL_OFFSET)
97 #define IDE_SELECT_REG (HWIF(drive)->io_base+IDE_SELECT_OFFSET)
98 #define IDE_STATUS_REG (HWIF(drive)->io_base+IDE_STATUS_OFFSET)
99 #define IDE_CONTROL_REG (HWIF(drive)->ctl_port)
100 #define IDE_FEATURE_REG IDE_ERROR_REG
101 #define IDE_COMMAND_REG IDE_STATUS_REG
102 #define IDE_ALTSTATUS_REG IDE_CONTROL_REG
103
104 #ifdef REALLY_FAST_IO
105 #define OUT_BYTE(b,p) outb((b),p)
106 #define IN_BYTE(p) (byte)inb(p)
107 #else
108 #define OUT_BYTE(b,p) outb_p((b),p)
109 #define IN_BYTE(p) (byte)inb_p(p)
110 #endif /* REALLY_FAST_IO */
111
112 #define GET_ERR() IN_BYTE(IDE_ERROR_REG)
113 #define GET_STAT() IN_BYTE(IDE_STATUS_REG)
114 #define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
115 #define BAD_R_STAT (BUSY_STAT | ERR_STAT)
116 #define BAD_W_STAT (BAD_R_STAT | WRERR_STAT)
117 #define BAD_STAT (BAD_R_STAT | DRQ_STAT)
118 #define DRIVE_READY (READY_STAT | SEEK_STAT)
119 #define DATA_READY (DRIVE_READY | DRQ_STAT)
120
121 /*
122 * Some more useful definitions
123 */
124 #define IDE_MAJOR_NAME "ide" /* the same for all i/f; see also genhd.c */
125 #define MAJOR_NAME IDE_MAJOR_NAME
126 #define PARTN_BITS 6 /* number of minor dev bits for partitions */
127 #define PARTN_MASK ((1<<PARTN_BITS)-1) /* a useful bit mask */
128 #define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
129 #ifndef MAX_HWIFS
130 #define MAX_HWIFS 4 /* an arbitrary, but realistic limit */
131 #endif
132 #define SECTOR_WORDS (512 / 4) /* number of 32bit words per sector */
133
134 /*
135 * Timeouts for various operations:
136 */
137 #define WAIT_DRQ (5*HZ/100) /* 50msec - spec allows up to 20ms */
138 #define WAIT_READY (3*HZ/100) /* 30msec - should be instantaneous */
139 #define WAIT_PIDENTIFY (1*HZ) /* 1sec - should be less than 3ms (?) */
140 #define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
141 #define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
142
143 #ifdef CONFIG_BLK_DEV_IDETAPE
144 #include "ide-tape.h"
145 #endif /* CONFIG_BLK_DEV_IDETAPE */
146
147 #ifdef CONFIG_BLK_DEV_IDECD
148
149 struct atapi_request_sense {
150 unsigned char error_code : 7;
151 unsigned char valid : 1;
152 byte reserved1;
153 unsigned char sense_key : 4;
154 unsigned char reserved2 : 1;
155 unsigned char ili : 1;
156 unsigned char reserved3 : 2;
157 byte info[4];
158 byte sense_len;
159 byte command_info[4];
160 byte asc;
161 byte ascq;
162 byte fru;
163 byte sense_key_specific[3];
164 };
165
166 struct packet_command {
167 char *buffer;
168 int buflen;
169 int stat;
170 struct atapi_request_sense *sense_data;
171 unsigned char c[12];
172 };
173
174 /* Space to hold the disk TOC. */
175
176 #define MAX_TRACKS 99
177 struct atapi_toc_header {
178 unsigned short toc_length;
179 byte first_track;
180 byte last_track;
181 };
182
183 struct atapi_toc_entry {
184 byte reserved1;
185 unsigned control : 4;
186 unsigned adr : 4;
187 byte track;
188 byte reserved2;
189 union {
190 unsigned lba;
191 struct {
192 byte reserved3;
193 byte m;
194 byte s;
195 byte f;
196 } msf;
197 } addr;
198 };
199
200 struct atapi_toc {
201 int last_session_lba;
202 int xa_flag;
203 unsigned capacity;
204 struct atapi_toc_header hdr;
205 struct atapi_toc_entry ent[MAX_TRACKS+1]; /* One extra for the leadout. */
206 };
207
208
209 /* This structure is annoyingly close to, but not identical with,
210 the cdrom_subchnl structure from cdrom.h. */
211 struct atapi_cdrom_subchnl
212 {
213 u_char acdsc_reserved;
214 u_char acdsc_audiostatus;
215 u_short acdsc_length;
216 u_char acdsc_format;
217
218 u_char acdsc_adr: 4;
219 u_char acdsc_ctrl: 4;
220 u_char acdsc_trk;
221 u_char acdsc_ind;
222 union
223 {
224 struct
225 {
226 u_char reserved;
227 u_char minute;
228 u_char second;
229 u_char frame;
230 } msf;
231 int lba;
232 } acdsc_absaddr;
233 union
234 {
235 struct
236 {
237 u_char reserved;
238 u_char minute;
239 u_char second;
240 u_char frame;
241 } msf;
242 int lba;
243 } acdsc_reladdr;
244 };
245
246
247 /* Extra per-device info for cdrom drives. */
248 struct cdrom_info {
249
250 /* Buffer for table of contents. NULL if we haven't allocated
251 a TOC buffer for this device yet. */
252
253 struct atapi_toc *toc;
254
255 /* Sector buffer. If a read request wants only the first part of a cdrom
256 block, we cache the rest of the block here, in the expectation that that
257 data is going to be wanted soon. SECTOR_BUFFERED is the number of the
258 first buffered sector, and NSECTORS_BUFFERED is the number of sectors
259 in the buffer. Before the buffer is allocated, we should have
260 SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
261
262 unsigned long sector_buffered;
263 unsigned long nsectors_buffered;
264 char *sector_buffer;
265
266 /* The result of the last successful request sense command
267 on this device. */
268 struct atapi_request_sense sense_data;
269 };
270
271 #endif /* CONFIG_BLK_DEV_IDECD */
272
273 /*
274 * Now for the data we need to maintain per-drive: ide_drive_t
275 */
276
277 typedef enum {ide_disk, ide_cdrom, ide_tape} ide_media_t;
278
279 typedef union {
280 unsigned all : 8; /* all of the bits together */
281 struct {
282 unsigned set_geometry : 1; /* respecify drive geometry */
283 unsigned recalibrate : 1; /* seek to cyl 0 */
284 unsigned set_multmode : 1; /* set multmode count */
285 unsigned set_pio : 1; /* set pio mode */
286 unsigned reserved : 4; /* unused */
287 } b;
288 } special_t;
289
290 typedef union {
291 unsigned all : 8; /* all of the bits together */
292 struct {
293 unsigned head : 4; /* always zeros here */
294 unsigned unit : 1; /* drive select number, 0 or 1 */
295 unsigned bit5 : 1; /* always 1 */
296 unsigned lba : 1; /* using LBA instead of CHS */
297 unsigned bit7 : 1; /* always 1 */
298 } b;
299 } select_t;
300
301 typedef struct ide_drive_s {
302 special_t special; /* special action flags */
303 unsigned present : 1; /* drive is physically present */
304 unsigned noprobe : 1; /* from: hdx=noprobe */
305 unsigned keep_settings : 1; /* restore settings after drive reset */
306 unsigned busy : 1; /* currently doing revalidate_disk() */
307 unsigned removeable : 1; /* 1 if need to do check_media_change */
308 unsigned using_dma : 1; /* disk is using dma for read/write */
309 unsigned forced_geom : 1; /* 1 if hdx=c,h,s was given at boot */
310 unsigned unmask : 1; /* flag: okay to unmask other irqs */
311 unsigned autotune : 2; /* 1=autotune, 2=noautotune, 0=default */
312 #if FAKE_FDISK_FOR_EZDRIVE
313 unsigned remap_0_to_1 : 1; /* flag: partitioned with ezdrive */
314 #endif /* FAKE_FDISK_FOR_EZDRIVE */
315 ide_media_t media; /* disk, cdrom, tape */
316 select_t select; /* basic drive/head select reg value */
317 byte ctl; /* "normal" value for IDE_CONTROL_REG */
318 byte ready_stat; /* min status value for drive ready */
319 byte mult_count; /* current multiple sector setting */
320 byte mult_req; /* requested multiple sector setting */
321 byte pio_req; /* requested multiple sector setting */
322 byte io_32bit; /* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
323 byte bad_wstat; /* used for ignoring WRERR_STAT */
324 byte sect0; /* offset of first sector for DM6:DDO */
325 byte usage; /* current "open()" count for drive */
326 byte head; /* "real" number of heads */
327 byte sect; /* "real" sectors per track */
328 byte bios_head; /* BIOS/fdisk/LILO number of heads */
329 byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
330 unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
331 unsigned short cyl; /* "real" number of cyls */
332 void *hwif; /* actually (ide_hwif_t *) */
333 struct wait_queue *wqueue; /* used to wait for drive in open() */
334 struct hd_driveid *id; /* drive model identification info */
335 struct hd_struct *part; /* drive partition table */
336 char name[4]; /* drive name, such as "hda" */
337 #ifdef CONFIG_BLK_DEV_IDECD
338 struct cdrom_info cdrom_info; /* for ide-cd.c */
339 #endif /* CONFIG_BLK_DEV_IDECD */
340 #ifdef CONFIG_BLK_DEV_IDETAPE
341 idetape_tape_t tape; /* for ide-tape.c */
342 #endif /* CONFIG_BLK_DEV_IDETAPE */
343
344 } ide_drive_t;
345
346 /*
347 * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
348 *
349 * The caller is assumed to have selected the drive and programmed the drive's
350 * sector address using CHS or LBA. All that remains is to prepare for DMA
351 * and then issue the actual read/write DMA/PIO command to the drive.
352 *
353 * Returns 0 if all went well.
354 * Returns 1 if DMA read/write could not be started, in which case the caller
355 * should either try again later, or revert to PIO for the current request.
356 */
357 typedef enum { ide_dma_read = 0, ide_dma_write = 1,
358 ide_dma_abort = 2, ide_dma_check = 3,
359 ide_dma_status_bad = 4, ide_dma_transferred = 5,
360 ide_dma_begin = 6 }
361 ide_dma_action_t;
362
363 typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
364
365
366 /*
367 * An ide_tuneproc_t() is used to set the speed of an IDE interface
368 * to a particular PIO mode. The "byte" parameter is used
369 * to select the PIO mode by number (0,1,2,3,4,5), and a value of 255
370 * indicates that the interface driver should "auto-tune" the PIO mode
371 * according to the drive capabilities in drive->id;
372 *
373 * Not all interface types support tuning, and not all of those
374 * support all possible PIO settings. They may silently ignore
375 * or round values as they see fit.
376 */
377 typedef void (ide_tuneproc_t)(ide_drive_t *, byte);
378
379 /*
380 * This is used to provide HT6560B interface support.
381 * It will probably also be used by the DC4030VL driver.
382 */
383 typedef void (ide_selectproc_t) (ide_drive_t *);
384
385 /*
386 * hwif_chipset_t is used to keep track of the specific hardware
387 * chipset used by each IDE interface, if known.
388 */
389 typedef enum { ide_unknown, ide_generic, ide_triton,
390 ide_cmd640, ide_dtc2278, ide_ali14xx,
391 ide_qd6580, ide_umc8672, ide_ht6560b }
392 hwif_chipset_t;
393
394 typedef struct hwif_s {
395 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
396 void *hwgroup; /* actually (ide_hwgroup_t *) */
397 unsigned short io_base; /* base io port addr */
398 unsigned short ctl_port; /* usually io_base+0x206 */
399 ide_drive_t drives[MAX_DRIVES]; /* drive info */
400 struct gendisk *gd; /* gendisk structure */
401 ide_tuneproc_t *tuneproc; /* routine to tune PIO mode for drives */
402 #ifdef CONFIG_BLK_DEV_HT6560B
403 ide_selectproc_t *selectproc; /* tweaks hardware to select drive */
404 #endif /* CONFIG_BLK_DEV_HT6560B */
405 ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
406 unsigned long *dmatable; /* dma physical region descriptor table */
407 unsigned short dma_base; /* base addr for dma ports (triton) */
408 byte irq; /* our irq number */
409 byte major; /* our major number */
410 char name[5]; /* name of interface, eg. "ide0" */
411 byte index; /* 0 for ide0; 1 for ide1; ... */
412 hwif_chipset_t chipset; /* sub-module for tuning.. */
413 unsigned noprobe : 1; /* don't probe for this interface */
414 unsigned present : 1; /* this interface exists */
415 unsigned serialized : 1; /* valid only for ide_hwifs[0] */
416 unsigned no_unmask : 1; /* disallow setting unmask bits */
417 #if (DISK_RECOVERY_TIME > 0)
418 unsigned long last_time; /* time when previous rq was done */
419 #endif
420 #ifdef CONFIG_BLK_DEV_IDECD
421 struct request request_sense_request; /* from ide-cd.c */
422 struct packet_command request_sense_pc; /* from ide-cd.c */
423 #endif /* CONFIG_BLK_DEV_IDECD */
424 #ifdef CONFIG_BLK_DEV_IDETAPE
425 ide_drive_t *tape_drive; /* Pointer to the tape on this interface */
426 #endif /* CONFIG_BLK_DEV_IDETAPE */
427 } ide_hwif_t;
428
429 /*
430 * internal ide interrupt handler type
431 */
432 typedef void (ide_handler_t)(ide_drive_t *);
433
434 typedef struct hwgroup_s {
435 ide_handler_t *handler;/* irq handler, if active */
436 ide_drive_t *drive; /* current drive */
437 ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
438 struct request *rq; /* current request */
439 struct timer_list timer; /* failsafe timer */
440 struct request wrq; /* local copy of current write rq */
441 unsigned long poll_timeout; /* timeout value during long polls */
442 } ide_hwgroup_t;
443
444 /*
445 * ide_hwifs[] is the master data structure used to keep track
446 * of just about everything in ide.c. Whenever possible, routines
447 * should be using pointers to a drive (ide_drive_t *) or
448 * pointers to a hwif (ide_hwif_t *), rather than indexing this
449 * structure directly (the allocation/layout may change!).
450 */
451 #ifdef _IDE_C
452 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
453 #else
454 extern ide_hwif_t ide_hwifs[];
455 #endif
456
457 /*
458 * One final include file, which references some of the data/defns from above
459 */
460 #define IDE_DRIVER /* "parameter" for blk.h */
461 #include <linux/blk.h>
462
463 #if (DISK_RECOVERY_TIME > 0)
464 void ide_set_recovery_timer (ide_hwif_t *);
465 #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
466 #else
467 #define SET_RECOVERY_TIMER(drive)
468 #endif
469
470 /*
471 * This is used for (nearly) all data transfers from the IDE interface
472 */
473 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
474
475 /*
476 * This is used for (nearly) all data transfers to the IDE interface
477 */
478 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
479
480 /*
481 * This is used on exit from the driver, to designate the next irq handler
482 * and also to start the safety timer.
483 */
484 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
485
486 /*
487 * Error reporting, in human readable form (luxurious, but a memory hog).
488 */
489 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
490
491 /*
492 * ide_error() takes action based on the error returned by the controller.
493 * The calling function must return afterwards, to restart the request.
494 */
495 void ide_error (ide_drive_t *drive, const char *msg, byte stat);
496
497 /*
498 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
499 * removing leading/trailing blanks and compressing internal blanks.
500 * It is primarily used to tidy up the model name/number fields as
501 * returned by the WIN_[P]IDENTIFY commands.
502 */
503 void ide_fixstring (byte *s, const int bytecount, const int byteswap);
504
505 /*
506 * This routine busy-waits for the drive status to be not "busy".
507 * It then checks the status for all of the "good" bits and none
508 * of the "bad" bits, and if all is okay it returns 0. All other
509 * cases return 1 after invoking ide_error() -- caller should return.
510 *
511 */
512 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
513
514 /*
515 * This routine is called from the partition-table code in genhd.c
516 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
517 *
518 * The second parameter, "xparm", determines exactly how the translation
519 * will be handled:
520 * 0 = convert to CHS with fewer than 1024 cyls
521 * using the same method as Ontrack DiskManager.
522 * 1 = same as "0", plus offset everything by 63 sectors.
523 * -1 = similar to "0", plus redirect sector 0 to sector 1.
524 * >1 = convert to a CHS geometry with "xparm" heads.
525 *
526 * Returns 0 if the translation was not possible, if the device was not
527 * an IDE disk drive, or if a geometry was "forced" on the commandline.
528 * Returns 1 if the geometry translation was successful.
529 */
530 int ide_xlate_1024 (kdev_t, int, const char *);
531
532 /*
533 * Start a reset operation for an IDE interface.
534 * The caller should return immediately after invoking this.
535 */
536 void ide_do_reset (ide_drive_t *);
537
538 /*
539 * This function is intended to be used prior to invoking ide_do_drive_cmd().
540 */
541 void ide_init_drive_cmd (struct request *rq);
542
543 /*
544 * "action" parameter type for ide_do_drive_cmd() below.
545 */
546 typedef enum
547 {ide_wait, /* insert rq at end of list, and wait for it */
548 ide_next, /* insert rq immediately after current request */
549 ide_preempt, /* insert rq in front of current request */
550 ide_end} /* insert rq at end of list, but don't wait for it */
551 ide_action_t;
552
553 /*
554 * This function issues a special IDE device request
555 * onto the request queue.
556 *
557 * If action is ide_wait, then then rq is queued at the end of
558 * the request queue, and the function sleeps until it has been
559 * processed. This is for use when invoked from an ioctl handler.
560 *
561 * If action is ide_preempt, then the rq is queued at the head of
562 * the request queue, displacing the currently-being-processed
563 * request and this function returns immediately without waiting
564 * for the new rq to be completed. This is VERY DANGEROUS, and is
565 * intended for careful use by the ATAPI tape/cdrom driver code.
566 *
567 * If action is ide_next, then the rq is queued immediately after
568 * the currently-being-processed-request (if any), and the function
569 * returns without waiting for the new rq to be completed. As above,
570 * This is VERY DANGEROUS, and is intended for careful use by the
571 * ATAPI tape/cdrom driver code.
572 *
573 * If action is ide_end, then the rq is queued at the end of the
574 * request queue, and the function returns immediately without waiting
575 * for the new rq to be completed. This is again intended for careful
576 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
577 * when operating in the pipelined operation mode).
578 */
579 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
580
581 /*
582 * Clean up after success/failure of an explicit drive cmd.
583 * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
584 */
585 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
586
587 #ifdef CONFIG_BLK_DEV_IDECD
588 /*
589 * These are routines in ide-cd.c invoked from ide.c
590 */
591 void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
592 int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
593 int ide_cdrom_check_media_change (ide_drive_t *);
594 int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
595 void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
596 void ide_cdrom_setup (ide_drive_t *);
597 #endif /* CONFIG_BLK_DEV_IDECD */
598
599 #ifdef CONFIG_BLK_DEV_IDETAPE
600
601 /*
602 * Functions in ide-tape.c which are invoked from ide.c:
603 */
604
605 /*
606 * idetape_identify_device is called during device probing stage to
607 * probe for an ide atapi tape drive and to initialize global variables
608 * in ide-tape.c which provide the link between the character device
609 * and the correspoding block device.
610 *
611 * Returns 1 if an ide tape was detected and is supported.
612 * Returns 0 otherwise.
613 */
614
615 int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
616
617 /*
618 * idetape_setup is called a bit later than idetape_identify_device,
619 * during the search for disk partitions, to initialize various tape
620 * state variables in ide_drive_t *drive.
621 */
622
623 void idetape_setup (ide_drive_t *drive);
624
625 /*
626 * idetape_do_request is our request function. It is called by ide.c
627 * to process a new request.
628 */
629
630 void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
631
632 /*
633 * idetape_end_request is used to finish servicing a request, and to
634 * insert a pending pipeline request into the main device queue.
635 */
636
637 void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
638
639 /*
640 * Block device interface functions.
641 */
642
643 int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
644 unsigned int cmd, unsigned long arg);
645 int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
646 void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
647
648 /*
649 * idetape_register_chrdev initializes the character device interface to
650 * the ide tape drive.
651 */
652
653 void idetape_register_chrdev (void);
654
655 #endif /* CONFIG_BLK_DEV_IDETAPE */
656
657 #ifdef CONFIG_BLK_DEV_TRITON
658 void ide_init_triton (byte, byte);
659 #endif /* CONFIG_BLK_DEV_TRITON */
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*/