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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 #if defined(CONFIG_BLK_DEV_HT6560B) || defined(CONFIG_BLK_DEV_PROMISE)
144 #define SELECT_DRIVE(hwif,drive) \
145 { \
146 if (hwif->selectproc) \
147 hwif->selectproc(drive); \
148 else \
149 OUT_BYTE((drive)->select.all, hwif->io_base+IDE_SELECT_OFFSET); \
150 }
151 #else
152 #define SELECT_DRIVE(hwif,drive) OUT_BYTE((drive)->select.all, hwif->io_base+IDE_SELECT_OFFSET);
153 #endif /* CONFIG_BLK_DEV_HT6560B || CONFIG_BLK_DEV_PROMISE */
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
187 /* Structure of a MSF cdrom address. */
188 struct atapi_msf {
189 byte reserved;
190 byte minute;
191 byte second;
192 byte frame;
193 };
194
195
196 /* Space to hold the disk TOC. */
197
198 #define MAX_TRACKS 99
199 struct atapi_toc_header {
200 unsigned short toc_length;
201 byte first_track;
202 byte last_track;
203 };
204
205 struct atapi_toc_entry {
206 byte reserved1;
207 unsigned control : 4;
208 unsigned adr : 4;
209 byte track;
210 byte reserved2;
211 union {
212 unsigned lba;
213 struct atapi_msf msf;
214 } addr;
215 };
216
217 struct atapi_toc {
218 int last_session_lba;
219 int xa_flag;
220 unsigned capacity;
221 struct atapi_toc_header hdr;
222 struct atapi_toc_entry ent[MAX_TRACKS+1];
223 /* One extra for the leadout. */
224 };
225
226
227 /* This structure is annoyingly close to, but not identical with,
228 the cdrom_subchnl structure from cdrom.h. */
229 struct atapi_cdrom_subchnl
230 {
231 u_char acdsc_reserved;
232 u_char acdsc_audiostatus;
233 u_short acdsc_length;
234 u_char acdsc_format;
235
236 u_char acdsc_adr: 4;
237 u_char acdsc_ctrl: 4;
238 u_char acdsc_trk;
239 u_char acdsc_ind;
240 union {
241 struct atapi_msf msf;
242 int lba;
243 } acdsc_absaddr;
244 union {
245 struct atapi_msf msf;
246 int lba;
247 } acdsc_reladdr;
248 };
249
250
251 /* Extra per-device info for cdrom drives. */
252 struct cdrom_info {
253
254 /* Buffer for table of contents. NULL if we haven't allocated
255 a TOC buffer for this device yet. */
256
257 struct atapi_toc *toc;
258
259 /* Sector buffer. If a read request wants only the first part
260 of a cdrom block, we cache the rest of the block here,
261 in the expectation that that data is going to be wanted soon.
262 SECTOR_BUFFERED is the number of the first buffered sector,
263 and NSECTORS_BUFFERED is the number of sectors in the buffer.
264 Before the buffer is allocated, we should have
265 SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
266
267 unsigned long sector_buffered;
268 unsigned long nsectors_buffered;
269 char *sector_buffer;
270
271 /* The result of the last successful request sense command
272 on this device. */
273 struct atapi_request_sense sense_data;
274 };
275
276 #endif /* CONFIG_BLK_DEV_IDECD */
277
278 /*
279 * Now for the data we need to maintain per-drive: ide_drive_t
280 */
281
282 typedef enum {ide_disk, ide_cdrom, ide_tape} ide_media_t;
283
284 typedef union {
285 unsigned all : 8; /* all of the bits together */
286 struct {
287 unsigned set_geometry : 1; /* respecify drive geometry */
288 unsigned recalibrate : 1; /* seek to cyl 0 */
289 unsigned set_multmode : 1; /* set multmode count */
290 unsigned set_pio : 1; /* set pio mode */
291 unsigned reserved : 4; /* unused */
292 } b;
293 } special_t;
294
295 typedef union {
296 unsigned all : 8; /* all of the bits together */
297 struct {
298 unsigned head : 4; /* always zeros here */
299 unsigned unit : 1; /* drive select number, 0 or 1 */
300 unsigned bit5 : 1; /* always 1 */
301 unsigned lba : 1; /* using LBA instead of CHS */
302 unsigned bit7 : 1; /* always 1 */
303 } b;
304 } select_t;
305
306 typedef struct ide_drive_s {
307 special_t special; /* special action flags */
308 unsigned present : 1; /* drive is physically present */
309 unsigned noprobe : 1; /* from: hdx=noprobe */
310 unsigned keep_settings : 1; /* restore settings after drive reset */
311 unsigned busy : 1; /* currently doing revalidate_disk() */
312 unsigned removeable : 1; /* 1 if need to do check_media_change */
313 unsigned using_dma : 1; /* disk is using dma for read/write */
314 unsigned forced_geom : 1; /* 1 if hdx=c,h,s was given at boot */
315 unsigned unmask : 1; /* flag: okay to unmask other irqs */
316 unsigned autotune : 2; /* 1=autotune, 2=noautotune, 0=default */
317 #if FAKE_FDISK_FOR_EZDRIVE
318 unsigned remap_0_to_1 : 1; /* flag: partitioned with ezdrive */
319 #endif /* FAKE_FDISK_FOR_EZDRIVE */
320 ide_media_t media; /* disk, cdrom, tape */
321 select_t select; /* basic drive/head select reg value */
322 byte ctl; /* "normal" value for IDE_CONTROL_REG */
323 byte ready_stat; /* min status value for drive ready */
324 byte mult_count; /* current multiple sector setting */
325 byte mult_req; /* requested multiple sector setting */
326 byte pio_req; /* requested multiple sector setting */
327 byte io_32bit; /* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
328 byte bad_wstat; /* used for ignoring WRERR_STAT */
329 byte sect0; /* offset of first sector for DM6:DDO */
330 byte usage; /* current "open()" count for drive */
331 byte head; /* "real" number of heads */
332 byte sect; /* "real" sectors per track */
333 byte bios_head; /* BIOS/fdisk/LILO number of heads */
334 byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
335 unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
336 unsigned short cyl; /* "real" number of cyls */
337 void *hwif; /* actually (ide_hwif_t *) */
338 struct wait_queue *wqueue; /* used to wait for drive in open() */
339 struct hd_driveid *id; /* drive model identification info */
340 struct hd_struct *part; /* drive partition table */
341 char name[4]; /* drive name, such as "hda" */
342 #ifdef CONFIG_BLK_DEV_IDECD
343 struct cdrom_info cdrom_info; /* for ide-cd.c */
344 #endif /* CONFIG_BLK_DEV_IDECD */
345 #ifdef CONFIG_BLK_DEV_IDETAPE
346 idetape_tape_t tape; /* for ide-tape.c */
347 #endif /* CONFIG_BLK_DEV_IDETAPE */
348 } ide_drive_t;
349
350 /*
351 * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
352 *
353 * The caller is assumed to have selected the drive and programmed the drive's
354 * sector address using CHS or LBA. All that remains is to prepare for DMA
355 * and then issue the actual read/write DMA/PIO command to the drive.
356 *
357 * Returns 0 if all went well.
358 * Returns 1 if DMA read/write could not be started, in which case the caller
359 * should either try again later, or revert to PIO for the current request.
360 */
361 typedef enum { ide_dma_read = 0, ide_dma_write = 1,
362 ide_dma_abort = 2, ide_dma_check = 3,
363 ide_dma_status_bad = 4, ide_dma_transferred = 5,
364 ide_dma_begin = 6 }
365 ide_dma_action_t;
366
367 typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
368
369
370 /*
371 * An ide_tuneproc_t() is used to set the speed of an IDE interface
372 * to a particular PIO mode. The "byte" parameter is used
373 * to select the PIO mode by number (0,1,2,3,4,5), and a value of 255
374 * indicates that the interface driver should "auto-tune" the PIO mode
375 * according to the drive capabilities in drive->id;
376 *
377 * Not all interface types support tuning, and not all of those
378 * support all possible PIO settings. They may silently ignore
379 * or round values as they see fit.
380 */
381 typedef void (ide_tuneproc_t)(ide_drive_t *, byte);
382
383 /*
384 * This is used to provide HT6560B & PROMISE interface support.
385 */
386 typedef void (ide_selectproc_t) (ide_drive_t *);
387
388 /*
389 * hwif_chipset_t is used to keep track of the specific hardware
390 * chipset used by each IDE interface, if known.
391 */
392 typedef enum { ide_unknown, ide_generic, ide_triton,
393 ide_cmd640, ide_dtc2278, ide_ali14xx,
394 ide_qd6580, ide_umc8672, ide_ht6560b,
395 ide_promise }
396 hwif_chipset_t;
397
398 typedef struct hwif_s {
399 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
400 void *hwgroup; /* actually (ide_hwgroup_t *) */
401 unsigned short io_base; /* base io port addr */
402 unsigned short ctl_port; /* usually io_base+0x206 */
403 ide_drive_t drives[MAX_DRIVES]; /* drive info */
404 struct gendisk *gd; /* gendisk structure */
405 ide_tuneproc_t *tuneproc; /* routine to tune PIO mode for drives */
406 #if defined(CONFIG_BLK_DEV_HT6560B) || defined(CONFIG_BLK_DEV_PROMISE)
407 ide_selectproc_t *selectproc; /* tweaks hardware to select drive */
408 #endif
409 ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
410 unsigned long *dmatable; /* dma physical region descriptor table */
411 unsigned short dma_base; /* base addr for dma ports (triton) */
412 byte irq; /* our irq number */
413 byte major; /* our major number */
414 char name[5]; /* name of interface, eg. "ide0" */
415 byte index; /* 0 for ide0; 1 for ide1; ... */
416 hwif_chipset_t chipset; /* sub-module for tuning.. */
417 unsigned noprobe : 1; /* don't probe for this interface */
418 unsigned present : 1; /* this interface exists */
419 unsigned serialized : 1; /* serialized operation with mate hwif */
420 unsigned no_unmask : 1; /* disallow setting unmask bits */
421 unsigned got_irq : 1; /* 1 = already alloc'd our irq */
422 #ifdef CONFIG_BLK_DEV_PROMISE
423 unsigned is_promise2: 1; /* 2nd i/f on promose DC4030 */
424 #endif /* CONFIG_BLK_DEV_PROMISE */
425 #if (DISK_RECOVERY_TIME > 0)
426 unsigned long last_time; /* time when previous rq was done */
427 #endif
428 #ifdef CONFIG_BLK_DEV_IDECD
429 struct request request_sense_request; /* from ide-cd.c */
430 struct packet_command request_sense_pc; /* from ide-cd.c */
431 #endif /* CONFIG_BLK_DEV_IDECD */
432 #ifdef CONFIG_BLK_DEV_IDETAPE
433 ide_drive_t *tape_drive; /* Pointer to the tape on this interface */
434 #endif /* CONFIG_BLK_DEV_IDETAPE */
435 } ide_hwif_t;
436
437 /*
438 * internal ide interrupt handler type
439 */
440 typedef void (ide_handler_t)(ide_drive_t *);
441
442 typedef struct hwgroup_s {
443 ide_handler_t *handler;/* irq handler, if active */
444 ide_drive_t *drive; /* current drive */
445 ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
446 ide_hwif_t *next_hwif; /* next selected hwif (for tape) */
447 struct request *rq; /* current request */
448 struct timer_list timer; /* failsafe timer */
449 struct request wrq; /* local copy of current write rq */
450 unsigned long poll_timeout; /* timeout value during long polls */
451 } ide_hwgroup_t;
452
453 /*
454 * ide_hwifs[] is the master data structure used to keep track
455 * of just about everything in ide.c. Whenever possible, routines
456 * should be using pointers to a drive (ide_drive_t *) or
457 * pointers to a hwif (ide_hwif_t *), rather than indexing this
458 * structure directly (the allocation/layout may change!).
459 */
460 #ifdef _IDE_C
461 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
462 #else
463 extern ide_hwif_t ide_hwifs[];
464 #endif
465
466 /*
467 * One final include file, which references some of the data/defns from above
468 */
469 #define IDE_DRIVER /* "parameter" for blk.h */
470 #include <linux/blk.h>
471
472 #if (DISK_RECOVERY_TIME > 0)
473 void ide_set_recovery_timer (ide_hwif_t *);
474 #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
475 #else
476 #define SET_RECOVERY_TIMER(drive)
477 #endif
478
479 /*
480 * This is used for (nearly) all data transfers from the IDE interface
481 */
482 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
483
484 /*
485 * This is used for (nearly) all data transfers to the IDE interface
486 */
487 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
488
489 /*
490 * This is used on exit from the driver, to designate the next irq handler
491 * and also to start the safety timer.
492 */
493 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
494
495 /*
496 * Error reporting, in human readable form (luxurious, but a memory hog).
497 */
498 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
499
500 /*
501 * ide_error() takes action based on the error returned by the controller.
502 * The calling function must return afterwards, to restart the request.
503 */
504 void ide_error (ide_drive_t *drive, const char *msg, byte stat);
505
506 /*
507 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
508 * removing leading/trailing blanks and compressing internal blanks.
509 * It is primarily used to tidy up the model name/number fields as
510 * returned by the WIN_[P]IDENTIFY commands.
511 */
512 void ide_fixstring (byte *s, const int bytecount, const int byteswap);
513
514 /*
515 * This routine busy-waits for the drive status to be not "busy".
516 * It then checks the status for all of the "good" bits and none
517 * of the "bad" bits, and if all is okay it returns 0. All other
518 * cases return 1 after invoking ide_error() -- caller should return.
519 *
520 */
521 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
522
523 /*
524 * This routine is called from the partition-table code in genhd.c
525 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
526 *
527 * The second parameter, "xparm", determines exactly how the translation
528 * will be handled:
529 * 0 = convert to CHS with fewer than 1024 cyls
530 * using the same method as Ontrack DiskManager.
531 * 1 = same as "0", plus offset everything by 63 sectors.
532 * -1 = similar to "0", plus redirect sector 0 to sector 1.
533 * >1 = convert to a CHS geometry with "xparm" heads.
534 *
535 * Returns 0 if the translation was not possible, if the device was not
536 * an IDE disk drive, or if a geometry was "forced" on the commandline.
537 * Returns 1 if the geometry translation was successful.
538 */
539 int ide_xlate_1024 (kdev_t, int, const char *);
540
541 /*
542 * Start a reset operation for an IDE interface.
543 * The caller should return immediately after invoking this.
544 */
545 void ide_do_reset (ide_drive_t *);
546
547 /*
548 * This function is intended to be used prior to invoking ide_do_drive_cmd().
549 */
550 void ide_init_drive_cmd (struct request *rq);
551
552 /*
553 * "action" parameter type for ide_do_drive_cmd() below.
554 */
555 typedef enum
556 {ide_wait, /* insert rq at end of list, and wait for it */
557 ide_next, /* insert rq immediately after current request */
558 ide_preempt, /* insert rq in front of current request */
559 ide_end} /* insert rq at end of list, but don't wait for it */
560 ide_action_t;
561
562 /*
563 * This function issues a special IDE device request
564 * onto the request queue.
565 *
566 * If action is ide_wait, then then rq is queued at the end of
567 * the request queue, and the function sleeps until it has been
568 * processed. This is for use when invoked from an ioctl handler.
569 *
570 * If action is ide_preempt, then the rq is queued at the head of
571 * the request queue, displacing the currently-being-processed
572 * request and this function returns immediately without waiting
573 * for the new rq to be completed. This is VERY DANGEROUS, and is
574 * intended for careful use by the ATAPI tape/cdrom driver code.
575 *
576 * If action is ide_next, then the rq is queued immediately after
577 * the currently-being-processed-request (if any), and the function
578 * returns without waiting for the new rq to be completed. As above,
579 * This is VERY DANGEROUS, and is intended for careful use by the
580 * ATAPI tape/cdrom driver code.
581 *
582 * If action is ide_end, then the rq is queued at the end of the
583 * request queue, and the function returns immediately without waiting
584 * for the new rq to be completed. This is again intended for careful
585 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
586 * when operating in the pipelined operation mode).
587 */
588 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
589
590 /*
591 * Clean up after success/failure of an explicit drive cmd.
592 * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
593 */
594 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
595
596 /*
597 * ide_multwrite() transfers a block of up to mcount sectors of data
598 * to a drive as part of a disk multwrite operation.
599 */
600 void ide_multwrite (ide_drive_t *drive, unsigned int mcount);
601
602 #ifdef CONFIG_BLK_DEV_IDECD
603 /*
604 * These are routines in ide-cd.c invoked from ide.c
605 */
606 void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
607 int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
608 int ide_cdrom_check_media_change (ide_drive_t *);
609 int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
610 void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
611 void ide_cdrom_setup (ide_drive_t *);
612 #endif /* CONFIG_BLK_DEV_IDECD */
613
614 #ifdef CONFIG_BLK_DEV_IDETAPE
615
616 /*
617 * Functions in ide-tape.c which are invoked from ide.c:
618 */
619
620 /*
621 * idetape_identify_device is called during device probing stage to
622 * probe for an ide atapi tape drive and to initialize global variables
623 * in ide-tape.c which provide the link between the character device
624 * and the correspoding block device.
625 *
626 * Returns 1 if an ide tape was detected and is supported.
627 * Returns 0 otherwise.
628 */
629
630 int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
631
632 /*
633 * idetape_setup is called a bit later than idetape_identify_device,
634 * during the search for disk partitions, to initialize various tape
635 * state variables in ide_drive_t *drive.
636 */
637
638 void idetape_setup (ide_drive_t *drive);
639
640 /*
641 * idetape_do_request is our request function. It is called by ide.c
642 * to process a new request.
643 */
644
645 void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
646
647 /*
648 * idetape_end_request is used to finish servicing a request, and to
649 * insert a pending pipeline request into the main device queue.
650 */
651
652 void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
653
654 /*
655 * Block device interface functions.
656 */
657
658 int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
659 unsigned int cmd, unsigned long arg);
660 int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
661 void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
662
663 /*
664 * idetape_register_chrdev initializes the character device interface to
665 * the ide tape drive.
666 */
667
668 void idetape_register_chrdev (void);
669
670 #endif /* CONFIG_BLK_DEV_IDETAPE */
671
672 #ifdef CONFIG_BLK_DEV_TRITON
673 void ide_init_triton (byte, byte);
674 #endif /* CONFIG_BLK_DEV_TRITON */
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*/