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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.24 Jan 4, 1996
3 *
4 * Copyright (C) 1994-1996 Linus Torvalds & authors (see below)
5 */
6
7 /*
8 * This is the multiple IDE interface driver, as evolved from hd.c.
9 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
10 * There can be up to two drives per interface, as per the ATA-2 spec.
11 *
12 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
13 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
14 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
15 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
16 *
17 * It is easy to extend ide.c to handle more than four interfaces:
18 *
19 * Change the MAX_HWIFS constant in ide.h.
20 *
21 * Define some new major numbers (in major.h), and insert them into
22 * the ide_hwif_to_major table in ide.c.
23 *
24 * Fill in the extra values for the new interfaces into the two tables
25 * inside ide.c: default_io_base[] and default_irqs[].
26 *
27 * Create the new request handlers by cloning "do_ide3_request()"
28 * for each new interface, and add them to the switch statement
29 * in the ide_init() function in ide.c.
30 *
31 * Recompile, create the new /dev/ entries, and it will probably work.
32 *
33 * From hd.c:
34 * |
35 * | It traverses the request-list, using interrupts to jump between functions.
36 * | As nearly all functions can be called within interrupts, we may not sleep.
37 * | Special care is recommended. Have Fun!
38 * |
39 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
40 * |
41 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
42 * | in the early extended-partition checks and added DM partitions.
43 * |
44 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
45 * |
46 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
47 * | and general streamlining by Mark Lord (mlord@bnr.ca).
48 *
49 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
50 *
51 * Mark Lord (mlord@bnr.ca) (IDE Perf.Pkg)
52 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
53 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
54 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
55 *
56 * Maintained by Mark Lord (mlord@bnr.ca): ide.c, ide.h, triton.c, hd.c, ..
57 *
58 * This was a rewrite of just about everything from hd.c, though some original
59 * code is still sprinkled about. Think of it as a major evolution, with
60 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
61 *
62 * Version 1.0 ALPHA initial code, primary i/f working okay
63 * Version 1.3 BETA dual i/f on shared irq tested & working!
64 * Version 1.4 BETA added auto probing for irq(s)
65 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
66 * ...
67 * Version 3.5 correct the bios_cyl field if it's too small
68 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
69 * Version 3.6 cosmetic corrections to comments and stuff
70 * (linux 1.1.77) reorganise probing code to make it understandable
71 * added halfway retry to probing for drive identification
72 * added "hdx=noprobe" command line option
73 * allow setting multmode even when identification fails
74 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
75 * increase DRQ_WAIT to eliminate nuisance messages
76 * wait for DRQ_STAT instead of DATA_READY during probing
77 * (courtesy of Gary Thomas gary@efland.UU.NET)
78 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
79 * update of ide-cd.c from Scott, allows blocksize=1024
80 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
81 * Version 3.9 don't use LBA if lba_capacity looks funny
82 * correct the drive capacity calculations
83 * fix probing for old Seagates without IDE_ALTSTATUS_REG
84 * fix byte-ordering for some NEC cdrom drives
85 * Version 3.10 disable multiple mode by default; was causing trouble
86 * Version 3.11 fix mis-identification of old WD disks as cdroms
87 * Version 3,12 simplify logic for selecting initial mult_count
88 * (fixes problems with buggy WD drives)
89 * Version 3.13 remove excess "multiple mode disabled" messages
90 * Version 3.14 fix ide_error() handling of BUSY_STAT
91 * fix byte-swapped cdrom strings (again.. arghh!)
92 * ignore INDEX bit when checking the ALTSTATUS reg
93 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
94 * ignore WRERR_STAT for non-write operations
95 * added vlb_sync support for DC-2000A & others,
96 * (incl. some Promise chips), courtesy of Frank Gockel
97 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
98 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
99 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
100 * add boot flag to "serialize" operation for CMD i/f
101 * add optional support for DTC2278 interfaces,
102 * courtesy of andy@cercle.cts.com (Dyan Wile).
103 * add boot flag to enable "dtc2278" probe
104 * add probe to avoid EATA (SCSI) interfaces,
105 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
106 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
107 * add flag to ignore WRERR_STAT for some drives
108 * courtesy of David.H.West@um.cc.umich.edu
109 * assembly syntax tweak to vlb_sync
110 * removeable drive support from scuba@cs.tu-berlin.de
111 * add transparent support for DiskManager-6.0x "Dynamic
112 * Disk Overlay" (DDO), most of this in in genhd.c
113 * eliminate "multiple mode turned off" message at boot
114 * Version 4.10 fix bug in ioctl for "hdparm -c3"
115 * fix DM6:DDO support -- now works with LILO, fdisk, ...
116 * don't treat some naughty WD drives as removeable
117 * Version 4.11 updated DM6 support using info provided by OnTrack
118 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
119 * added support for 3rd/4th/alternative IDE ports
120 * created ide.h; ide-cd.c now compiles separate from ide.c
121 * hopefully fixed infinite "unexpected_intr" from cdroms
122 * zillions of other changes and restructuring
123 * somehow reduced overall memory usage by several kB
124 * probably slowed things down slightly, but worth it
125 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
126 * was happening at various times/places: whenever the
127 * ide-interface's ctl_port was used to "mask" the irq,
128 * it also would trigger an edge in the process of masking
129 * which would result in a self-inflicted interrupt!!
130 * (such a stupid way to build a hardware interrupt mask).
131 * This is now fixed (after a year of head-scratching).
132 * Version 5.02 got rid of need for {enable,disable}_irq_list()
133 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
134 * removed PROBE_FOR_IRQS option -- no longer needed
135 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
136 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
137 * added more comments, cleaned up unexpected_intr()
138 * OOOPS! fixed null pointer problem in ide reset code
139 * added autodetect for Triton chipset -- no effect yet
140 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
141 * OOOPS! fixed bug in ide_do_request()
142 * added ATAPI reset sequence for cdroms
143 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
144 * some (mostly) cosmetic changes
145 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
146 * reworked PCI scanning code
147 * added automatic RZ1000 detection/support
148 * added automatic PCI CMD640 detection/support
149 * added option for VLB CMD640 support
150 * tweaked probe to find cdrom on hdb with disks on hda,hdc
151 * Version 5.12 some performance tuning
152 * added message to alert user to bad /dev/hd[cd] entries
153 * OOOPS! fixed bug in atapi reset
154 * driver now forces "serialize" again for all cmd640 chips
155 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
156 * made do_drive_cmd() into public ide_do_drive_cmd()
157 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
158 * fixed ht6560b support
159 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
160 * don't bother invalidating nonexistent partitions
161 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
162 * added & tested full EZ-DRIVE support -- don't use LILO!
163 * don't enable 2nd CMD640 PCI port during init - conflict
164 * Version 5.15 bug fix in init_cmd640_vlb()
165 * bug fix in interrupt sharing code
166 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
167 * remove "Huh?" from cmd640 code
168 * added qd6580 interface speed select from Colten Edwards
169 * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
170 * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
171 * new UMC8672 code, moved to umc8672.c, #include'd for now
172 * disallow turning on DMA when h/w not capable of DMA
173 * Version 5.19 fix potential infinite timeout on resets
174 * extend reset poll into a general purpose polling scheme
175 * add atapi tape drive support from Gadi Oxman
176 * simplify exit from _intr routines -- no IDE_DO_REQUEST
177 * Version 5.20 leave current rq on blkdev request list during I/O
178 * generalized ide_do_drive_cmd() for tape/cdrom driver use
179 * Version 5.21 fix nasty cdrom/tape bug (ide_preempt was messed up)
180 * Version 5.22 fix ide_xlate_1024() to work with/without drive->id
181 * Version 5.23 miscellaneous touch-ups
182 * Version 5.24 fix #if's for SUPPORT_CMD640
183 *
184 * Driver compile-time options are in ide.h
185 *
186 * To do, in likely order of completion:
187 * - make cmd640.c and umc8672.c compile separately from ide.c
188 * - add ALI M1443/1445 chipset support from derekn@vw.ece.cmu.edu
189 * - add ioctls to get/set interface timings on various interfaces
190 * - add Promise Caching controller support from peterd@pnd-pc.demon.co.uk
191 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
192 * - add new HT6560B code from malafoss@snakemail.hut.fi
193 */
194
195 #undef REALLY_SLOW_IO /* most systems can safely undef this */
196
197 #include <linux/config.h>
198 #include <linux/types.h>
199 #include <linux/string.h>
200 #include <linux/kernel.h>
201 #include <linux/delay.h>
202 #include <linux/timer.h>
203 #include <linux/mm.h>
204 #include <linux/ioport.h>
205 #include <linux/interrupt.h>
206 #include <linux/major.h>
207 #include <linux/blkdev.h>
208 #include <linux/errno.h>
209 #include <linux/hdreg.h>
210 #include <linux/genhd.h>
211 #include <linux/malloc.h>
212
213 #include <asm/byteorder.h>
214 #include <asm/irq.h>
215 #include <asm/segment.h>
216 #include <asm/io.h>
217
218 #ifdef CONFIG_PCI
219 #include <linux/bios32.h>
220 #include <linux/pci.h>
221 #endif /* CONFIG_PCI */
222
223 #include "ide.h"
224
225 #if SUPPORT_CMD640
226 void cmd640_tune_drive(ide_drive_t *);
227 static int cmd640_vlb = 0;
228 #endif
229
230 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* hwif info */
231 static ide_hwgroup_t *irq_to_hwgroup [16];
232 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
233
234 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
235 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
236 static int serialized = 0; /* "serialize" option */
237 static int disallow_unmask = 0; /* for buggy hardware */
238
239 #if (DISK_RECOVERY_TIME > 0)
240 /*
241 * For really screwy hardware (hey, at least it *can* be used with Linux)
242 * we can enforce a minimum delay time between successive operations.
243 */
244 static unsigned long read_timer(void)
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245 {
246 unsigned long t, flags;
247 int i;
248
249 save_flags(flags);
250 cli();
251 t = jiffies * 11932;
252 outb_p(0, 0x43);
253 i = inb_p(0x40);
254 i |= inb(0x40) << 8;
255 restore_flags(flags);
256 return (t - i);
257 }
258
259 static void set_recovery_timer (ide_hwif_t *hwif)
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260 {
261 hwif->last_time = read_timer();
262 }
263 #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
264
265 #else
266
267 #define SET_RECOVERY_TIMER(drive)
268
269 #endif /* DISK_RECOVERY_TIME */
270
271 /*
272 * init_ide_data() sets reasonable default values into all fields
273 * of all instances of the hwifs and drives, but only on the first call.
274 * Subsequent calls have no effect (they don't wipe out anything).
275 *
276 * This routine is normally called at driver initialization time,
277 * but may also be called MUCH earlier during kernel "command-line"
278 * parameter processing. As such, we cannot depend on any other parts
279 * of the kernel (such as memory allocation) to be functioning yet.
280 *
281 * This is too bad, as otherwise we could dynamically allocate the
282 * ide_drive_t structs as needed, rather than always consuming memory
283 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
284 */
285 #define MAGIC_COOKIE 0x12345678
286 static void init_ide_data (void)
/* */
287 {
288 byte *p;
289 unsigned int h, unit;
290 static unsigned long magic_cookie = MAGIC_COOKIE;
291
292 if (magic_cookie != MAGIC_COOKIE)
293 return; /* already initialized */
294 magic_cookie = 0;
295
296 for (h = 0; h < 16; ++h)
297 irq_to_hwgroup[h] = NULL;
298
299 /* bulk initialize hwif & drive info with zeros */
300 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
301 do {
302 *--p = 0;
303 } while (p > (byte *) ide_hwifs);
304
305 for (h = 0; h < MAX_HWIFS; ++h) {
306 ide_hwif_t *hwif = &ide_hwifs[h];
307
308 /* fill in any non-zero initial values */
309 hwif->noprobe = (h > 1);
310 hwif->io_base = default_io_base[h];
311 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
312 #ifdef CONFIG_BLK_DEV_HD
313 if (hwif->io_base == HD_DATA)
314 hwif->noprobe = 1; /* may be overriden by ide_setup() */
315 #endif /* CONFIG_BLK_DEV_HD */
316 hwif->major = ide_hwif_to_major[h];
317 hwif->name[0] = 'i';
318 hwif->name[1] = 'd';
319 hwif->name[2] = 'e';
320 hwif->name[3] = '0' + h;
321 #ifdef CONFIG_BLK_DEV_IDETAPE
322 hwif->tape_drive = NULL;
323 #endif /* CONFIG_BLK_DEV_IDETAPE */
324 for (unit = 0; unit < MAX_DRIVES; ++unit) {
325 ide_drive_t *drive = &hwif->drives[unit];
326
327 /* fill in any non-zero initial values */
328 drive->select.all = (unit<<4)|0xa0;
329 drive->hwif = hwif;
330 drive->ctl = 0x08;
331 drive->ready_stat = READY_STAT;
332 drive->bad_wstat = BAD_W_STAT;
333 drive->special.b.recalibrate = 1;
334 drive->special.b.set_geometry = 1;
335 drive->name[0] = 'h';
336 drive->name[1] = 'd';
337 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
338 }
339 }
340 }
341
342 #define VLB_SYNC 1
343 /*
344 * Some localbus EIDE interfaces require a special access sequence
345 * when using 32-bit I/O instructions to transfer data. We call this
346 * the "vlb_sync" sequence, which consists of three successive reads
347 * of the sector count register location, with interrupts disabled
348 * to ensure that the reads all happen together.
349 */
350 static inline void do_vlb_sync (unsigned short port) {
/* */
351 (void) inb (port);
352 (void) inb (port);
353 (void) inb (port);
354 }
355
356 /*
357 * This is used for most PIO data transfers *from* the IDE interface
358 */
359 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
360 {
361 unsigned short io_base = HWIF(drive)->io_base;
362 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
363
364 if (drive->vlb_32bit) {
365 #ifdef VLB_SYNC
366 if (drive->vlb_sync) {
367 cli();
368 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
369 insl(data_reg, buffer, wcount);
370 if (drive->unmask)
371 sti();
372 } else
373 #endif /* VLB_SYNC */
374 insl(data_reg, buffer, wcount);
375 } else
376 insw(data_reg, buffer, wcount<<1);
377 }
378
379 /*
380 * This is used for most PIO data transfers *to* the IDE interface
381 */
382 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
383 {
384 unsigned short io_base = HWIF(drive)->io_base;
385 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
386
387 if (drive->vlb_32bit) {
388 #ifdef VLB_SYNC
389 if (drive->vlb_sync) {
390 cli();
391 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
392 outsl(data_reg, buffer, wcount);
393 if (drive->unmask)
394 sti();
395 } else
396 #endif /* VLB_SYNC */
397 outsl(data_reg, buffer, wcount);
398 } else
399 outsw(data_reg, buffer, wcount<<1);
400 }
401
402 #if SUPPORT_HT6560B
403 /*
404 * This routine handles interface switching for the peculiar hardware design
405 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
406 * The HT-6560B can only enable one IDE port at a time, and requires a
407 * silly sequence (below) whenever we switch between primary and secondary.
408 *
409 * Apparently, systems with multiple CMD640 chips may need something similar..
410 *
411 * This algorithm courtesy of malafoss@snakemail.hut.fi
412 *
413 * At least one user has reported that this code can confuse the floppy
414 * controller and/or driver -- perhaps this should be changed to use
415 * a read-modify-write sequence, so as not to disturb other bits in the reg?
416 */
417
418 void ide_hwif_select (ide_hwif_t *hwif)
/* */
419 {
420 static byte current_select = 0;
421
422 if (hwif->select != current_select) {
423 byte t;
424 unsigned long flags;
425 save_flags (flags);
426 cli();
427 current_select = hwif->select;
428 (void) inb(0x3e6);
429 (void) inb(0x3e6);
430 (void) inb(0x3e6);
431 /*
432 * Avoid clobbering existing bits at 0x3e6:
433 * bit5 (0x20) - disables fast interface speed
434 * bit0 (0x01) - enables secondary interface
435 * we don't touch any other bits
436 */
437 t = inb(0x3e6);
438 t &= (~0x21);
439 t |= (current_select & 0x21);
440 outb(t,0x3e6);
441 restore_flags (flags);
442 }
443 }
444 #endif /* SUPPORT_HT6560B */
445
446 /*
447 * This should get invoked any time we exit the driver to
448 * wait for an interrupt response from a drive. handler() points
449 * at the appropriate code to handle the next interrupt, and a
450 * timer is started to prevent us from waiting forever in case
451 * something goes wrong (see the timer_expiry() handler later on).
452 */
453 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
/* */
454 {
455 ide_hwgroup_t *hwgroup = HWGROUP(drive);
456 #ifdef DEBUG
457 if (hwgroup->handler != NULL) {
458 printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
459 drive->name, hwgroup->handler, handler);
460 }
461 #endif
462 hwgroup->handler = handler;
463 hwgroup->timer.expires = jiffies + timeout;
464 add_timer(&(hwgroup->timer));
465 }
466
467 /*
468 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
469 * value for this drive (from its reported identification information).
470 *
471 * Returns: 1 if lba_capacity looks sensible
472 * 0 otherwise
473 */
474 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
475 {
476 unsigned long lba_sects = id->lba_capacity;
477 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
478 unsigned long _10_percent = chs_sects / 10;
479
480 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
481 if ((lba_sects - chs_sects) < _10_percent)
482 return 1; /* lba_capacity is good */
483
484 /* some drives have the word order reversed */
485 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
486 if ((lba_sects - chs_sects) < _10_percent) {
487 id->lba_capacity = lba_sects; /* fix it */
488 return 1; /* lba_capacity is (now) good */
489 }
490 return 0; /* lba_capacity value is bad */
491 }
492
493 /*
494 * current_capacity() returns the capacity (in sectors) of a drive
495 * according to its current geometry/LBA settings.
496 */
497 static unsigned long current_capacity (ide_drive_t *drive)
/* */
498 {
499 struct hd_driveid *id = drive->id;
500 unsigned long capacity;
501
502 if (!drive->present)
503 return 0;
504 if (drive->media != ide_disk)
505 return 0x7fffffff; /* cdrom or tape */
506 /* Determine capacity, and use LBA if the drive properly supports it */
507 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
508 drive->select.b.lba = 1;
509 capacity = id->lba_capacity;
510 } else {
511 drive->select.b.lba = 0;
512 capacity = drive->cyl * drive->head * drive->sect;
513 }
514 return (capacity - drive->sect0);
515 }
516
517 /*
518 * ide_geninit() is called exactly *once* for each major, from genhd.c,
519 * at the beginning of the initial partition check for the drives.
520 */
521 static void ide_geninit (struct gendisk *gd)
/* */
522 {
523 unsigned int unit;
524 ide_hwif_t *hwif = gd->real_devices;
525
526 for (unit = 0; unit < gd->nr_real; ++unit) {
527 ide_drive_t *drive = &hwif->drives[unit];
528 #ifdef CONFIG_BLK_DEV_IDECD
529 if (drive->present && drive->media == ide_cdrom)
530 ide_cdrom_setup(drive);
531 #endif /* CONFIG_BLK_DEV_IDECD */
532 #ifdef CONFIG_BLK_DEV_IDETAPE
533 if (drive->present && drive->media == ide_tape)
534 idetape_setup(drive);
535 #endif /* CONFIG_BLK_DEV_IDETAPE */
536 drive->part[0].nr_sects = current_capacity(drive);
537 if (!drive->present || drive->media != ide_disk) {
538 drive->part[0].start_sect = -1; /* skip partition check */
539 }
540 }
541 /*
542 * The partition check in genhd.c needs this string to identify
543 * our minor devices by name for display purposes.
544 * Note that doing this will prevent us from working correctly
545 * if ever called a second time for this major (never happens).
546 */
547 gd->real_devices = hwif->drives[0].name; /* name of first drive */
548 }
549
550 /*
551 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
552 * after probing for drives, to allocate partition tables and other data
553 * structures needed for the routines in genhd.c. ide_geninit() gets called
554 * somewhat later, during the partition check.
555 */
556 static void init_gendisk (ide_hwif_t *hwif)
/* */
557 {
558 struct gendisk *gd;
559 unsigned int unit, units, minors;
560 int *bs;
561
562 /* figure out maximum drive number on the interface */
563 for (units = MAX_DRIVES; units > 0; --units) {
564 if (hwif->drives[units-1].present)
565 break;
566 }
567 minors = units * (1<<PARTN_BITS);
568 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
569 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
570 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
571 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
572
573 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
574 blksize_size[hwif->major] = bs;
575 for (unit = 0; unit < minors; ++unit)
576 *bs++ = BLOCK_SIZE;
577
578 for (unit = 0; unit < units; ++unit)
579 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
580
581 gd->major = hwif->major; /* our major device number */
582 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
583 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
584 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
585 gd->max_nr = units; /* max num real drives */
586 gd->nr_real = units; /* current num real drives */
587 gd->init = ide_geninit; /* initialization function */
588 gd->real_devices= hwif; /* ptr to internal data */
589
590 gd->next = gendisk_head; /* link new major into list */
591 hwif->gd = gendisk_head = gd;
592 }
593
594 static void do_reset1 (ide_drive_t *, int); /* needed below */
595
596 #ifdef CONFIG_BLK_DEV_IDEATAPI
597 /*
598 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
599 * during an atapi drive reset operation. If the drive has not yet responded,
600 * and we have not yet hit our maximum waiting time, then the timer is restarted
601 * for another 50ms.
602 */
603 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
604 {
605 ide_hwgroup_t *hwgroup = HWGROUP(drive);
606 byte stat;
607
608 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
609 udelay (10);
610
611 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
612 printk("%s: ATAPI reset complete\n", drive->name);
613 } else {
614 if (jiffies < hwgroup->poll_timeout) {
615 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
616 return; /* continue polling */
617 }
618 hwgroup->poll_timeout = 0; /* end of polling */
619 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
620 do_reset1 (drive, 1); /* do it the old fashioned way */
621 }
622 hwgroup->poll_timeout = 0; /* done polling */
623 }
624 #endif /* CONFIG_BLK_DEV_IDEATAPI */
625
626 /*
627 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
628 * during an ide reset operation. If the drives have not yet responded,
629 * and we have not yet hit our maximum waiting time, then the timer is restarted
630 * for another 50ms.
631 */
632 static void reset_pollfunc (ide_drive_t *drive)
/* */
633 {
634 ide_hwgroup_t *hwgroup = HWGROUP(drive);
635 ide_hwif_t *hwif = HWIF(drive);
636 byte tmp;
637
638 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
639 if (jiffies < hwgroup->poll_timeout) {
640 ide_set_handler (drive, &reset_pollfunc, HZ/20);
641 return; /* continue polling */
642 }
643 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
644 } else {
645 printk("%s: reset: ", hwif->name);
646 if ((tmp = GET_ERR()) == 1)
647 printk("success\n");
648 else {
649 printk("master: ");
650 switch (tmp & 0x7f) {
651 case 1: printk("passed");
652 break;
653 case 2: printk("formatter device error");
654 break;
655 case 3: printk("sector buffer error");
656 break;
657 case 4: printk("ECC circuitry error");
658 break;
659 case 5: printk("controlling MPU error");
660 break;
661 default:printk("error (0x%02x?)", tmp);
662 }
663 if (tmp & 0x80)
664 printk("; slave: failed");
665 printk("\n");
666 }
667 }
668 hwgroup->poll_timeout = 0; /* done polling */
669 }
670
671 /*
672 * do_reset1() attempts to recover a confused drive by resetting it.
673 * Unfortunately, resetting a disk drive actually resets all devices on
674 * the same interface, so it can really be thought of as resetting the
675 * interface rather than resetting the drive.
676 *
677 * ATAPI devices have their own reset mechanism which allows them to be
678 * individually reset without clobbering other devices on the same interface.
679 *
680 * Unfortunately, the IDE interface does not generate an interrupt to let
681 * us know when the reset operation has finished, so we must poll for this.
682 * Equally poor, though, is the fact that this may a very long time to complete,
683 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
684 * we set a timer to poll at 50ms intervals.
685 */
686 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
687 {
688 unsigned int unit;
689 unsigned long flags;
690 ide_hwif_t *hwif = HWIF(drive);
691 ide_hwgroup_t *hwgroup = HWGROUP(drive);
692
693 save_flags(flags);
694 cli(); /* Why ? */
695
696 #ifdef CONFIG_BLK_DEV_IDEATAPI
697 /* For an ATAPI device, first try an ATAPI SRST. */
698 if (drive->media != ide_disk) {
699 if (!do_not_try_atapi) {
700 if (!drive->keep_settings)
701 drive->unmask = 0;
702 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
703 udelay (20);
704 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
705 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
706 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
707 restore_flags (flags);
708 return;
709 }
710 }
711 #endif /* CONFIG_BLK_DEV_IDEATAPI */
712
713 /*
714 * First, reset any device state data we were maintaining
715 * for any of the drives on this interface.
716 */
717 for (unit = 0; unit < MAX_DRIVES; ++unit) {
718 ide_drive_t *rdrive = &hwif->drives[unit];
719 rdrive->special.b.set_geometry = 1;
720 rdrive->special.b.recalibrate = 1;
721 rdrive->special.b.set_multmode = 0;
722 if (OK_TO_RESET_CONTROLLER)
723 rdrive->mult_count = 0;
724 if (!rdrive->keep_settings) {
725 rdrive->mult_req = 0;
726 rdrive->unmask = 0;
727 }
728 if (rdrive->mult_req != rdrive->mult_count)
729 rdrive->special.b.set_multmode = 1;
730 }
731
732 #if OK_TO_RESET_CONTROLLER
733 /*
734 * Note that we also set nIEN while resetting the device,
735 * to mask unwanted interrupts from the interface during the reset.
736 * However, due to the design of PC hardware, this will cause an
737 * immediate interrupt due to the edge transition it produces.
738 * This single interrupt gives us a "fast poll" for drives that
739 * recover from reset very quickly, saving us the first 50ms wait time.
740 */
741 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
742 udelay(5); /* more than enough time */
743 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
744 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
745 ide_set_handler (drive, &reset_pollfunc, HZ/20);
746 #endif /* OK_TO_RESET_CONTROLLER */
747
748 restore_flags (flags);
749 }
750
751 /*
752 * ide_do_reset() is the entry point to the drive/interface reset code.
753 */
754 void ide_do_reset (ide_drive_t *drive)
/* */
755 {
756 do_reset1 (drive, 0);
757 }
758
759 /*
760 * Clean up after success/failure of an explicit drive cmd
761 */
762 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
763 {
764 unsigned long flags;
765 struct request *rq = HWGROUP(drive)->rq;
766
767 if (rq->cmd == IDE_DRIVE_CMD) {
768 byte *args = (byte *) rq->buffer;
769 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
770 if (args) {
771 args[0] = stat;
772 args[1] = err;
773 args[2] = IN_BYTE(IDE_NSECTOR_REG);
774 }
775 }
776 save_flags(flags);
777 cli();
778 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
779 HWGROUP(drive)->rq = NULL;
780 rq->rq_status = RQ_INACTIVE;
781 if (rq->sem != NULL)
782 up(rq->sem);
783 restore_flags(flags);
784 }
785
786 /*
787 * Error reporting, in human readable form (luxurious, but a memory hog).
788 */
789 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
790 {
791 unsigned long flags;
792 byte err = 0;
793
794 save_flags (flags);
795 sti();
796 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
797 #if FANCY_STATUS_DUMPS
798 if (drive->media == ide_disk) {
799 printk(" { ");
800 if (stat & BUSY_STAT)
801 printk("Busy ");
802 else {
803 if (stat & READY_STAT) printk("DriveReady ");
804 if (stat & WRERR_STAT) printk("DeviceFault ");
805 if (stat & SEEK_STAT) printk("SeekComplete ");
806 if (stat & DRQ_STAT) printk("DataRequest ");
807 if (stat & ECC_STAT) printk("CorrectedError ");
808 if (stat & INDEX_STAT) printk("Index ");
809 if (stat & ERR_STAT) printk("Error ");
810 }
811 printk("}");
812 }
813 #endif /* FANCY_STATUS_DUMPS */
814 printk("\n");
815 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
816 err = GET_ERR();
817 printk("%s: %s: error=0x%02x", drive->name, msg, err);
818 #if FANCY_STATUS_DUMPS
819 if (drive->media == ide_disk) {
820 printk(" { ");
821 if (err & BBD_ERR) printk("BadSector ");
822 if (err & ECC_ERR) printk("UncorrectableError ");
823 if (err & ID_ERR) printk("SectorIdNotFound ");
824 if (err & ABRT_ERR) printk("DriveStatusError ");
825 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
826 if (err & MARK_ERR) printk("AddrMarkNotFound ");
827 printk("}");
828 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
829 byte cur = IN_BYTE(IDE_SELECT_REG);
830 if (cur & 0x40) { /* using LBA? */
831 printk(", LBAsect=%ld", (unsigned long)
832 ((cur&0xf)<<24)
833 |(IN_BYTE(IDE_HCYL_REG)<<16)
834 |(IN_BYTE(IDE_LCYL_REG)<<8)
835 | IN_BYTE(IDE_SECTOR_REG));
836 } else {
837 printk(", CHS=%d/%d/%d",
838 (IN_BYTE(IDE_HCYL_REG)<<8) +
839 IN_BYTE(IDE_LCYL_REG),
840 cur & 0xf,
841 IN_BYTE(IDE_SECTOR_REG));
842 }
843 if (HWGROUP(drive)->rq)
844 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
845 }
846 }
847 #endif /* FANCY_STATUS_DUMPS */
848 printk("\n");
849 }
850 restore_flags (flags);
851 return err;
852 }
853
854 /*
855 * try_to_flush_leftover_data() is invoked in response to a drive
856 * unexpectedly having its DRQ_STAT bit set. As an alternative to
857 * resetting the drive, this routine tries to clear the condition
858 * by read a sector's worth of data from the drive. Of course,
859 * this may not help if the drive is *waiting* for data from *us*.
860 */
861 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
862 {
863 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
864
865 while (i > 0) {
866 unsigned long buffer[16];
867 unsigned int wcount = (i > 16) ? 16 : i;
868 i -= wcount;
869 ide_input_data (drive, buffer, wcount);
870 }
871 }
872
873 /*
874 * ide_error() takes action based on the error returned by the controller.
875 */
876 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
877 {
878 struct request *rq;
879 byte err;
880
881 err = ide_dump_status(drive, msg, stat);
882 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
883 return;
884 if (rq->cmd != READ && rq->cmd != WRITE) { /* retry only "normal" i/o */
885 rq->errors = 1;
886 ide_end_drive_cmd(drive, stat, err);
887 return;
888 }
889 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
890 rq->errors |= ERROR_RESET;
891 } else {
892 if (drive->media == ide_disk && (stat & ERR_STAT)) {
893 /* err has different meaning on cdrom and tape */
894 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
895 rq->errors = ERROR_MAX;
896 else if (err & TRK0_ERR) /* help it find track zero */
897 rq->errors |= ERROR_RECAL;
898 }
899 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
900 try_to_flush_leftover_data(drive);
901 }
902 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
903 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
904
905 #ifdef CONFIG_BLK_DEV_TRITON
906 if (rq->errors > 3 && drive->using_dma) { /* DMA troubles? */
907 drive->using_dma = 0;
908 printk("%s: DMA disabled\n", drive->name);
909 --rq->errors;
910 return;
911 }
912 #endif /* CONFIG_BLK_DEV_TRITON */
913 if (rq->errors >= ERROR_MAX)
914 ide_end_request(0, HWGROUP(drive));
915 else {
916 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
917 ++rq->errors;
918 ide_do_reset(drive);
919 return;
920 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
921 drive->special.b.recalibrate = 1;
922 ++rq->errors;
923 }
924 }
925
926 /*
927 * read_intr() is the handler for disk read/multread interrupts
928 */
929 static void read_intr (ide_drive_t *drive)
/* */
930 {
931 byte stat;
932 int i;
933 unsigned int msect, nsect;
934 struct request *rq;
935
936 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
937 ide_error(drive, "read_intr", stat);
938 return;
939 }
940 msect = drive->mult_count;
941 read_next:
942 rq = HWGROUP(drive)->rq;
943 if (msect) {
944 if ((nsect = rq->current_nr_sectors) > msect)
945 nsect = msect;
946 msect -= nsect;
947 } else
948 nsect = 1;
949 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
950 #ifdef DEBUG
951 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
952 drive->name, rq->sector, rq->sector+nsect-1,
953 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
954 #endif
955 rq->sector += nsect;
956 rq->buffer += nsect<<9;
957 rq->errors = 0;
958 i = (rq->nr_sectors -= nsect);
959 if ((rq->current_nr_sectors -= nsect) <= 0)
960 ide_end_request(1, HWGROUP(drive));
961 if (i > 0) {
962 if (msect)
963 goto read_next;
964 ide_set_handler (drive, &read_intr, WAIT_CMD);
965 }
966 }
967
968 /*
969 * write_intr() is the handler for disk write interrupts
970 */
971 static void write_intr (ide_drive_t *drive)
/* */
972 {
973 byte stat;
974 int i;
975 ide_hwgroup_t *hwgroup = HWGROUP(drive);
976 struct request *rq = hwgroup->rq;
977
978 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
979 #ifdef DEBUG
980 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
981 drive->name, rq->sector, (unsigned long) rq->buffer,
982 rq->nr_sectors-1);
983 #endif
984 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
985 rq->sector++;
986 rq->buffer += 512;
987 rq->errors = 0;
988 i = --rq->nr_sectors;
989 --rq->current_nr_sectors;
990 if (rq->current_nr_sectors <= 0)
991 ide_end_request(1, hwgroup);
992 if (i > 0) {
993 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
994 ide_set_handler (drive, &write_intr, WAIT_CMD);
995 }
996 return;
997 }
998 }
999 ide_error(drive, "write_intr", stat);
1000 }
1001
1002 /*
1003 * multwrite() transfers a block of one or more sectors of data to a drive
1004 * as part of a disk multwrite operation.
1005 */
1006 static void multwrite (ide_drive_t *drive)
/* */
1007 {
1008 struct request *rq = &HWGROUP(drive)->wrq;
1009 unsigned int mcount = drive->mult_count;
1010
1011 do {
1012 unsigned int nsect = rq->current_nr_sectors;
1013 if (nsect > mcount)
1014 nsect = mcount;
1015 mcount -= nsect;
1016
1017 ide_output_data(drive, rq->buffer, nsect<<7);
1018 #ifdef DEBUG
1019 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1020 drive->name, rq->sector, (unsigned long) rq->buffer,
1021 nsect, rq->nr_sectors - nsect);
1022 #endif
1023 if ((rq->nr_sectors -= nsect) <= 0)
1024 break;
1025 if ((rq->current_nr_sectors -= nsect) == 0) {
1026 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1027 rq->current_nr_sectors = rq->bh->b_size>>9;
1028 rq->buffer = rq->bh->b_data;
1029 } else {
1030 panic("%s: buffer list corrupted\n", drive->name);
1031 break;
1032 }
1033 } else {
1034 rq->buffer += nsect << 9;
1035 }
1036 } while (mcount);
1037 }
1038
1039 /*
1040 * write_intr() is the handler for disk multwrite interrupts
1041 */
1042 static void multwrite_intr (ide_drive_t *drive)
/* */
1043 {
1044 byte stat;
1045 int i;
1046 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1047 struct request *rq = &hwgroup->wrq;
1048
1049 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1050 if (stat & DRQ_STAT) {
1051 if (rq->nr_sectors) {
1052 multwrite(drive);
1053 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1054 return;
1055 }
1056 } else {
1057 if (!rq->nr_sectors) { /* all done? */
1058 rq = hwgroup->rq;
1059 for (i = rq->nr_sectors; i > 0;){
1060 i -= rq->current_nr_sectors;
1061 ide_end_request(1, hwgroup);
1062 }
1063 return;
1064 }
1065 }
1066 }
1067 ide_error(drive, "multwrite_intr", stat);
1068 }
1069
1070 /*
1071 * Issue a simple drive command
1072 * The drive must be selected beforehand.
1073 */
1074 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1075 {
1076 ide_set_handler (drive, handler, WAIT_CMD);
1077 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1078 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1079 OUT_BYTE(cmd,IDE_COMMAND_REG);
1080 }
1081
1082 /*
1083 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1084 */
1085 static void set_multmode_intr (ide_drive_t *drive)
/* */
1086 {
1087 byte stat = GET_STAT();
1088
1089 sti();
1090 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1091 drive->mult_count = drive->mult_req;
1092 } else {
1093 drive->mult_req = drive->mult_count = 0;
1094 drive->special.b.recalibrate = 1;
1095 (void) ide_dump_status(drive, "set_multmode", stat);
1096 }
1097 }
1098
1099 /*
1100 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1101 */
1102 static void set_geometry_intr (ide_drive_t *drive)
/* */
1103 {
1104 byte stat = GET_STAT();
1105
1106 sti();
1107 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1108 ide_error(drive, "set_geometry_intr", stat);
1109 }
1110
1111 /*
1112 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1113 */
1114 static void recal_intr (ide_drive_t *drive)
/* */
1115 {
1116 byte stat = GET_STAT();
1117
1118 sti();
1119 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1120 ide_error(drive, "recal_intr", stat);
1121 }
1122
1123 /*
1124 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1125 */
1126 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1127 {
1128 byte stat = GET_STAT();
1129
1130 sti();
1131 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1132 ide_end_drive_cmd (drive, stat, GET_ERR());
1133 else
1134 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1135 }
1136
1137 /*
1138 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1139 * commands to a drive. It used to do much more, but has been scaled back
1140 * in recent updates, and could be completely eliminated with a bit more effort.
1141 */
1142 static inline void do_special (ide_drive_t *drive)
/* */
1143 {
1144 special_t *s = &drive->special;
1145 #ifdef DEBUG
1146 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1147 #endif
1148 if (s->b.set_geometry) {
1149 s->b.set_geometry = 0;
1150 if (drive->media == ide_disk) {
1151 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1152 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1153 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1154 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1155 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1156 }
1157 } else if (s->b.recalibrate) {
1158 s->b.recalibrate = 0;
1159 if (drive->media == ide_disk) {
1160 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1161 }
1162 } else if (s->b.set_multmode) {
1163 s->b.set_multmode = 0;
1164 if (drive->media == ide_disk) {
1165 if (drive->id && drive->mult_req > drive->id->max_multsect)
1166 drive->mult_req = drive->id->max_multsect;
1167 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1168 } else
1169 drive->mult_req = 0;
1170 } else if (s->all) {
1171 s->all = 0;
1172 printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1173 }
1174 }
1175
1176 /*
1177 * This routine busy-waits for the drive status to be not "busy".
1178 * It then checks the status for all of the "good" bits and none
1179 * of the "bad" bits, and if all is okay it returns 0. All other
1180 * cases return 1 after invoking ide_error() -- caller should just return.
1181 *
1182 * This routine should get fixed to not hog the cpu during extra long waits..
1183 * That could be done by busy-waiting for the first jiffy or two, and then
1184 * setting a timer to wake up at half second intervals thereafter,
1185 * until timeout is achieved, before timing out.
1186 */
1187 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1188 {
1189 byte stat;
1190 unsigned long flags;
1191
1192 test:
1193 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1194 if (OK_STAT((stat = GET_STAT()), good, bad))
1195 return 0; /* fast exit for most frequent case */
1196 if (!(stat & BUSY_STAT)) {
1197 ide_error(drive, "status error", stat);
1198 return 1;
1199 }
1200
1201 save_flags(flags);
1202 sti();
1203 timeout += jiffies;
1204 do {
1205 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1206 restore_flags(flags);
1207 goto test;
1208 }
1209 } while (jiffies <= timeout);
1210
1211 restore_flags(flags);
1212 ide_error(drive, "status timeout", GET_STAT());
1213 return 1;
1214 }
1215
1216 /*
1217 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1218 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1219 * care of issuing special DRIVE_CMDs.
1220 */
1221 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1222 {
1223 unsigned short io_base = HWIF(drive)->io_base;
1224
1225 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1226 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1227 if (drive->select.b.lba) {
1228 #ifdef DEBUG
1229 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1230 drive->name, (rq->cmd==READ)?"read":"writ",
1231 block, rq->nr_sectors, (unsigned long) rq->buffer);
1232 #endif
1233 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1234 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1235 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1236 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1237 } else {
1238 unsigned int sect,head,cyl,track;
1239 track = block / drive->sect;
1240 sect = block % drive->sect + 1;
1241 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1242 head = track % drive->head;
1243 cyl = track / drive->head;
1244 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1245 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1246 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1247 #ifdef DEBUG
1248 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1249 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1250 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1251 #endif
1252 }
1253 if (rq->cmd == READ) {
1254 #ifdef CONFIG_BLK_DEV_TRITON
1255 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1256 return;
1257 #endif /* CONFIG_BLK_DEV_TRITON */
1258 ide_set_handler(drive, &read_intr, WAIT_CMD);
1259 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1260 return;
1261 }
1262 if (rq->cmd == WRITE) {
1263 #ifdef CONFIG_BLK_DEV_TRITON
1264 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1265 return;
1266 #endif /* CONFIG_BLK_DEV_TRITON */
1267 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1268 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1269 printk("%s: no DRQ after issuing %s\n", drive->name,
1270 drive->mult_count ? "MULTWRITE" : "WRITE");
1271 return;
1272 }
1273 if (!drive->unmask)
1274 cli();
1275 if (drive->mult_count) {
1276 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1277 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1278 multwrite(drive);
1279 } else {
1280 ide_set_handler (drive, &write_intr, WAIT_CMD);
1281 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1282 }
1283 return;
1284 }
1285 if (rq->cmd == IDE_DRIVE_CMD) {
1286 byte *args = rq->buffer;
1287 if (args) {
1288 #ifdef DEBUG
1289 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1290 drive->name, args[0], args[1], args[2]);
1291 #endif
1292 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1293 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1294 return;
1295 } else {
1296 /*
1297 * NULL is actually a valid way of waiting for
1298 * all current requests to be flushed from the queue.
1299 */
1300 #ifdef DEBUG
1301 printk("%s: DRIVE_CMD (null)\n", drive->name);
1302 #endif
1303 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1304 return;
1305 }
1306 }
1307 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1308 ide_end_request(0, HWGROUP(drive));
1309 }
1310
1311 /*
1312 * do_request() initiates handling of a new I/O request
1313 */
1314 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1315 {
1316 unsigned int minor, unit;
1317 unsigned long block, blockend;
1318 ide_drive_t *drive;
1319
1320 sti();
1321 #ifdef DEBUG
1322 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1323 #endif
1324 minor = MINOR(rq->rq_dev);
1325 unit = minor >> PARTN_BITS;
1326 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1327 printk("%s: bad device number: %s\n",
1328 hwif->name, kdevname(rq->rq_dev));
1329 goto kill_rq;
1330 }
1331 drive = &hwif->drives[unit];
1332 #ifdef DEBUG
1333 if (rq->bh && !buffer_locked(rq->bh)) {
1334 printk("%s: block not locked\n", drive->name);
1335 goto kill_rq;
1336 }
1337 #endif
1338 block = rq->sector;
1339 blockend = block + rq->nr_sectors;
1340 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1341 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1342 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1343 goto kill_rq;
1344 }
1345 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1346 #if FAKE_FDISK_FOR_EZDRIVE
1347 if (block == 0 && drive->ezdrive) {
1348 block = 1;
1349 printk("%s: [EZD] accessing sector 1 instead of sector 0\n", drive->name);
1350 }
1351 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1352 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1353 #if (DISK_RECOVERY_TIME > 0)
1354 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1355 #endif
1356 #if SUPPORT_HT6560B
1357 if (hwif->select)
1358 ide_hwif_select (hwif);
1359 #endif
1360
1361 #ifdef CONFIG_BLK_DEV_IDETAPE
1362 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1363 #endif /* CONFIG_BLK_DEV_IDETAPE */
1364
1365 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1366 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1367 printk("%s: drive not ready for command\n", drive->name);
1368 return;
1369 }
1370
1371 if (!drive->special.all) {
1372 #ifdef CONFIG_BLK_DEV_IDEATAPI
1373 switch (drive->media) {
1374 case ide_disk:
1375 do_rw_disk (drive, rq, block);
1376 return;
1377 #ifdef CONFIG_BLK_DEV_IDECD
1378 case ide_cdrom:
1379 ide_do_rw_cdrom (drive, block);
1380 return;
1381 #endif /* CONFIG_BLK_DEV_IDECD */
1382
1383 #ifdef CONFIG_BLK_DEV_IDETAPE
1384 case ide_tape:
1385 idetape_do_request (drive, rq, block);
1386 return;
1387 #endif /* CONFIG_BLK_DEV_IDETAPE */
1388
1389 default:
1390 printk("%s: media type %d not supported\n",
1391 drive->name, drive->media);
1392 goto kill_rq;
1393 }
1394 #else
1395 do_rw_disk (drive, rq, block); /* simpler and faster */
1396 return;
1397 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1398 }
1399 do_special(drive);
1400 return;
1401 kill_rq:
1402 ide_end_request(0, hwif->hwgroup);
1403 }
1404
1405 /*
1406 * The driver enables interrupts as much as possible. In order to do this,
1407 * (a) the device-interrupt is always masked before entry, and
1408 * (b) the timeout-interrupt is always disabled before entry.
1409 *
1410 * If we enter here from, say irq14, and then start a new request for irq15,
1411 * (possible with "serialize" option) then we cannot ensure that we exit
1412 * before the irq15 hits us. So, we must be careful not to let this bother us.
1413 *
1414 * Interrupts are still masked (by default) whenever we are exchanging
1415 * data/cmds with a drive, because some drives seem to have very poor
1416 * tolerance for latency during I/O. For devices which don't suffer from
1417 * this problem (most don't), the unmask flag can be set using the "hdparm"
1418 * utility, to permit other interrupts during data/cmd transfers.
1419 */
1420 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1421 {
1422 cli(); /* paranoia */
1423 if (hwgroup->handler != NULL) {
1424 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1425 return;
1426 }
1427 do {
1428 ide_hwif_t *hwif = hwgroup->hwif;
1429 struct request *rq;
1430 if ((rq = hwgroup->rq) == NULL) {
1431 do {
1432 rq = blk_dev[hwif->major].current_request;
1433 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1434 goto got_rq;
1435 } while ((hwif = hwif->next) != hwgroup->hwif);
1436 return; /* no work left for this hwgroup */
1437 }
1438 got_rq:
1439 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1440 cli();
1441 } while (hwgroup->handler == NULL);
1442 }
1443
1444 /*
1445 * do_hwgroup_request() invokes ide_do_request() after first masking
1446 * all possible interrupts for the current hwgroup. This prevents race
1447 * conditions in the event that an unexpected interrupt occurs while
1448 * we are in the driver.
1449 *
1450 * Note that when an interrupt is used to reenter the driver, the first level
1451 * handler will already have masked the irq that triggered, but any other ones
1452 * for the hwgroup will still be unmasked. The driver tries to be careful
1453 * about such things.
1454 */
1455 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1456 {
1457 if (hwgroup->handler == NULL) {
1458 ide_hwif_t *hgif = hwgroup->hwif;
1459 ide_hwif_t *hwif = hgif;
1460 do {
1461 disable_irq(hwif->irq);
1462 } while ((hwif = hwif->next) != hgif);
1463 ide_do_request (hwgroup);
1464 do {
1465 enable_irq(hwif->irq);
1466 } while ((hwif = hwif->next) != hgif);
1467 }
1468 }
1469
1470 static void do_ide0_request (void) /* invoked with cli() */
/* */
1471 {
1472 do_hwgroup_request (ide_hwifs[0].hwgroup);
1473 }
1474
1475 static void do_ide1_request (void) /* invoked with cli() */
/* */
1476 {
1477 do_hwgroup_request (ide_hwifs[1].hwgroup);
1478 }
1479
1480 static void do_ide2_request (void) /* invoked with cli() */
/* */
1481 {
1482 do_hwgroup_request (ide_hwifs[2].hwgroup);
1483 }
1484
1485 static void do_ide3_request (void) /* invoked with cli() */
/* */
1486 {
1487 do_hwgroup_request (ide_hwifs[3].hwgroup);
1488 }
1489
1490 static void timer_expiry (unsigned long data)
/* */
1491 {
1492 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1493 ide_drive_t *drive = hwgroup->drive;
1494 unsigned long flags;
1495
1496 save_flags(flags);
1497 cli();
1498
1499 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1500 ide_handler_t *handler = hwgroup->handler;
1501 hwgroup->handler = NULL;
1502 handler(drive);
1503 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1504 sti(); /* drive must have responded just as the timer expired */
1505 printk("%s: marginal timeout\n", drive->name);
1506 } else {
1507 hwgroup->handler = NULL; /* abort the operation */
1508 if (hwgroup->hwif->dmaproc)
1509 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1510 ide_error(drive, "irq timeout", GET_STAT());
1511 }
1512 if (hwgroup->handler == NULL)
1513 do_hwgroup_request (hwgroup);
1514 restore_flags(flags);
1515 }
1516
1517 /*
1518 * There's nothing really useful we can do with an unexpected interrupt,
1519 * other than reading the status register (to clear it), and logging it.
1520 * There should be no way that an irq can happen before we're ready for it,
1521 * so we needn't worry much about losing an "important" interrupt here.
1522 *
1523 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1524 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1525 * "good", we just ignore the interrupt completely.
1526 *
1527 * This routine assumes cli() is in effect when called.
1528 *
1529 * If an unexpected interrupt happens on irq15 while we are handling irq14
1530 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1531 * we could screw up by interfering with a new request being set up for irq15.
1532 *
1533 * In reality, this is a non-issue. The new command is not sent unless the
1534 * drive is ready to accept one, in which case we know the drive is not
1535 * trying to interrupt us. And ide_set_handler() is always invoked before
1536 * completing the issuance of any new drive command, so we will not be
1537 * accidently invoked as a result of any valid command completion interrupt.
1538 *
1539 */
1540 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1541 {
1542 byte stat;
1543 unsigned int unit;
1544 ide_hwif_t *hwif = hwgroup->hwif;
1545
1546 /*
1547 * handle the unexpected interrupt
1548 */
1549 do {
1550 if (hwif->irq == irq) {
1551 #if SUPPORT_HT6560B
1552 if (hwif->select)
1553 ide_hwif_select (hwif);
1554 #endif
1555 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1556 ide_drive_t *drive = &hwif->drives[unit];
1557 if (!drive->present)
1558 continue;
1559 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1560 (void) ide_dump_status(drive, "unexpected_intr", stat);
1561 if ((stat & DRQ_STAT))
1562 try_to_flush_leftover_data(drive);
1563 }
1564 }
1565 } while ((hwif = hwif->next) != hwgroup->hwif);
1566 }
1567
1568 /*
1569 * entry point for all interrupts, caller does cli() for us
1570 */
1571 static void ide_intr (int irq, struct pt_regs *regs)
/* */
1572 {
1573 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1574 ide_handler_t *handler;
1575
1576 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1577 ide_drive_t *drive = hwgroup->drive;
1578 hwgroup->handler = NULL;
1579 del_timer(&(hwgroup->timer));
1580 if (drive->unmask)
1581 sti();
1582 handler(drive);
1583 cli(); /* this is necessary, as next rq may be different irq */
1584 if (hwgroup->handler == NULL) {
1585 SET_RECOVERY_TIMER(HWIF(drive));
1586 ide_do_request(hwgroup);
1587 }
1588 } else {
1589 unexpected_intr(irq, hwgroup);
1590 }
1591 cli();
1592 }
1593
1594 /*
1595 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1596 * It returns NULL if the given device number does not match any present drives.
1597 */
1598 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1599 {
1600 int major = MAJOR(i_rdev);
1601 unsigned int h;
1602
1603 for (h = 0; h < MAX_HWIFS; ++h) {
1604 ide_hwif_t *hwif = &ide_hwifs[h];
1605 if (hwif->present && major == hwif->major) {
1606 unsigned unit = DEVICE_NR(i_rdev);
1607 if (unit < MAX_DRIVES) {
1608 ide_drive_t *drive = &hwif->drives[unit];
1609 if (drive->present)
1610 return drive;
1611 } else if (major == IDE0_MAJOR && unit < 4) {
1612 printk("ide: probable bad entry for /dev/hd%c%d\n",
1613 'a' + unit, MINOR(i_rdev) & PARTN_MASK);
1614 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1615 }
1616 break;
1617 }
1618 }
1619 return NULL;
1620 }
1621
1622 /*
1623 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1624 */
1625 void ide_init_drive_cmd (struct request *rq)
/* */
1626 {
1627 rq->buffer = NULL;
1628 rq->cmd = IDE_DRIVE_CMD;
1629 rq->sector = 0;
1630 rq->nr_sectors = 0;
1631 rq->current_nr_sectors = 0;
1632 rq->sem = NULL;
1633 rq->bh = NULL;
1634 rq->bhtail = NULL;
1635 rq->next = NULL;
1636
1637 #if 0 /* these are done each time through ide_do_drive_cmd() */
1638 rq->errors = 0;
1639 rq->rq_status = RQ_ACTIVE;
1640 rq->rq_dev = ????;
1641 #endif
1642 }
1643
1644 /*
1645 * This function issues a special IDE device request
1646 * onto the request queue.
1647 *
1648 * If action is ide_wait, then then rq is queued at the end of
1649 * the request queue, and the function sleeps until it has been
1650 * processed. This is for use when invoked from an ioctl handler.
1651 *
1652 * If action is ide_preempt, then the rq is queued at the head of
1653 * the request queue, displacing the currently-being-processed
1654 * request and this function returns immediately without waiting
1655 * for the new rq to be completed. This is VERY DANGEROUS, and is
1656 * intended for careful use by the ATAPI tape/cdrom driver code.
1657 *
1658 * If action is ide_next, then the rq is queued immediately after
1659 * the currently-being-processed-request (if any), and the function
1660 * returns without waiting for the new rq to be completed. As above,
1661 * This is VERY DANGEROUS, and is intended for careful use by the
1662 * ATAPI tape/cdrom driver code.
1663 *
1664 * If action is ide_end, then the rq is queued at the end of the
1665 * request queue, and the function returns immediately without waiting
1666 * for the new rq to be completed. This is again intended for careful
1667 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1668 * when operating in the pipelined operation mode).
1669 */
1670 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1671 {
1672 unsigned long flags;
1673 unsigned int major = HWIF(drive)->major;
1674 struct request *cur_rq;
1675 struct blk_dev_struct *bdev = &blk_dev[major];
1676 struct semaphore sem = MUTEX_LOCKED;
1677
1678 rq->errors = 0;
1679 rq->rq_status = RQ_ACTIVE;
1680 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1681 if (action == ide_wait)
1682 rq->sem = &sem;
1683
1684 save_flags(flags);
1685 cli();
1686 cur_rq = bdev->current_request;
1687
1688 if (cur_rq == NULL || action == ide_preempt) {
1689 rq->next = cur_rq;
1690 bdev->current_request = rq;
1691 HWGROUP(drive)->rq = NULL;
1692 if (action != ide_preempt)
1693 bdev->request_fn();
1694 } else {
1695 if (action == ide_wait || action == ide_end) {
1696 while (cur_rq->next != NULL) /* find end of list */
1697 cur_rq = cur_rq->next;
1698 }
1699 rq->next = cur_rq->next;
1700 cur_rq->next = rq;
1701 }
1702 if (action == ide_wait)
1703 down(&sem); /* wait for it to be serviced */
1704 restore_flags(flags);
1705 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1706 }
1707
1708 static int ide_open(struct inode * inode, struct file * filp)
/* */
1709 {
1710 ide_drive_t *drive;
1711 unsigned long flags;
1712
1713 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1714 return -ENODEV;
1715 save_flags(flags);
1716 cli();
1717 while (drive->busy)
1718 sleep_on(&drive->wqueue);
1719 drive->usage++;
1720 restore_flags(flags);
1721 #ifdef CONFIG_BLK_DEV_IDECD
1722 if (drive->media == ide_cdrom)
1723 return ide_cdrom_open (inode, filp, drive);
1724 #endif /* CONFIG_BLK_DEV_IDECD */
1725 #ifdef CONFIG_BLK_DEV_IDETAPE
1726 if (drive->media == ide_tape)
1727 return idetape_blkdev_open (inode, filp, drive);
1728 #endif /* CONFIG_BLK_DEV_IDETAPE */
1729 if (drive->removeable) {
1730 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1731 struct request rq;
1732 check_disk_change(inode->i_rdev);
1733 ide_init_drive_cmd (&rq);
1734 rq.buffer = door_lock;
1735 /*
1736 * Ignore the return code from door_lock,
1737 * since the open() has already succeeded,
1738 * and the door_lock is irrelevant at this point.
1739 */
1740 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1741 }
1742 return 0;
1743 }
1744
1745 /*
1746 * Releasing a block device means we sync() it, so that it can safely
1747 * be forgotten about...
1748 */
1749 static void ide_release(struct inode * inode, struct file * file)
/* */
1750 {
1751 ide_drive_t *drive;
1752
1753 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1754 sync_dev(inode->i_rdev);
1755 drive->usage--;
1756 #ifdef CONFIG_BLK_DEV_IDECD
1757 if (drive->media == ide_cdrom) {
1758 ide_cdrom_release (inode, file, drive);
1759 return;
1760 }
1761 #endif /* CONFIG_BLK_DEV_IDECD */
1762 #ifdef CONFIG_BLK_DEV_IDETAPE
1763 if (drive->media == ide_tape) {
1764 idetape_blkdev_release (inode, file, drive);
1765 return;
1766 }
1767 #endif /* CONFIG_BLK_DEV_IDETAPE */
1768 if (drive->removeable) {
1769 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1770 struct request rq;
1771 invalidate_buffers(inode->i_rdev);
1772 ide_init_drive_cmd (&rq);
1773 rq.buffer = door_unlock;
1774 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1775 }
1776 }
1777 }
1778
1779 /*
1780 * This routine is called to flush all partitions and partition tables
1781 * for a changed disk, and then re-read the new partition table.
1782 * If we are revalidating a disk because of a media change, then we
1783 * enter with usage == 0. If we are using an ioctl, we automatically have
1784 * usage == 1 (we need an open channel to use an ioctl :-), so this
1785 * is our limit.
1786 */
1787 static int revalidate_disk(kdev_t i_rdev)
/* */
1788 {
1789 ide_drive_t *drive;
1790 unsigned int p, major, minor;
1791 long flags;
1792
1793 if ((drive = get_info_ptr(i_rdev)) == NULL)
1794 return -ENODEV;
1795
1796 major = MAJOR(i_rdev);
1797 minor = drive->select.b.unit << PARTN_BITS;
1798 save_flags(flags);
1799 cli();
1800 if (drive->busy || (drive->usage > 1)) {
1801 restore_flags(flags);
1802 return -EBUSY;
1803 };
1804 drive->busy = 1;
1805 restore_flags(flags);
1806
1807 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1808 if (drive->part[p].nr_sects > 0) {
1809 kdev_t devp = MKDEV(major, minor+p);
1810 sync_dev (devp);
1811 invalidate_inodes (devp);
1812 invalidate_buffers (devp);
1813 }
1814 drive->part[p].start_sect = 0;
1815 drive->part[p].nr_sects = 0;
1816 };
1817
1818 drive->part[0].nr_sects = current_capacity(drive);
1819 if (drive->media == ide_disk)
1820 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1821
1822 drive->busy = 0;
1823 wake_up(&drive->wqueue);
1824 return 0;
1825 }
1826
1827 static int write_fs_long (unsigned long useraddr, long value)
/* */
1828 {
1829 int err;
1830
1831 if (NULL == (long *)useraddr)
1832 return -EINVAL;
1833 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1834 return err;
1835 put_user((unsigned)value, (long *) useraddr);
1836 return 0;
1837 }
1838
1839 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1840 unsigned int cmd, unsigned long arg)
1841 {
1842 struct hd_geometry *loc = (struct hd_geometry *) arg;
1843 int err;
1844 ide_drive_t *drive;
1845 unsigned long flags;
1846 struct request rq;
1847
1848 ide_init_drive_cmd (&rq);
1849 if (!inode || !(inode->i_rdev))
1850 return -EINVAL;
1851 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1852 return -ENODEV;
1853 switch (cmd) {
1854 case HDIO_GETGEO:
1855 if (!loc || drive->media != ide_disk) return -EINVAL;
1856 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1857 if (err) return err;
1858 put_user(drive->bios_head, (byte *) &loc->heads);
1859 put_user(drive->bios_sect, (byte *) &loc->sectors);
1860 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1861 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1862 (unsigned long *) &loc->start);
1863 return 0;
1864
1865 case BLKFLSBUF:
1866 if(!suser()) return -EACCES;
1867 fsync_dev(inode->i_rdev);
1868 invalidate_buffers(inode->i_rdev);
1869 return 0;
1870
1871 case BLKRASET:
1872 if(!suser()) return -EACCES;
1873 if(arg > 0xff) return -EINVAL;
1874 read_ahead[MAJOR(inode->i_rdev)] = arg;
1875 return 0;
1876
1877 case BLKRAGET:
1878 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1879
1880 case BLKGETSIZE: /* Return device size */
1881 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1882 case BLKRRPART: /* Re-read partition tables */
1883 return revalidate_disk(inode->i_rdev);
1884
1885 case HDIO_GET_KEEPSETTINGS:
1886 return write_fs_long(arg, drive->keep_settings);
1887
1888 case HDIO_GET_UNMASKINTR:
1889 return write_fs_long(arg, drive->unmask);
1890
1891 case HDIO_GET_DMA:
1892 return write_fs_long(arg, drive->using_dma);
1893
1894 case HDIO_GET_CHIPSET:
1895 return write_fs_long(arg, drive->chipset);
1896
1897 case HDIO_GET_MULTCOUNT:
1898 return write_fs_long(arg, drive->mult_count);
1899
1900 case HDIO_GET_IDENTITY:
1901 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1902 return -EINVAL;
1903 if (drive->id == NULL)
1904 return -ENOMSG;
1905 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1906 if (!err)
1907 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1908 return err;
1909
1910 case HDIO_GET_NOWERR:
1911 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1912
1913 case HDIO_SET_DMA:
1914 if (drive->media != ide_disk)
1915 return -EPERM;
1916 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1917 return -EPERM;
1918 case HDIO_SET_KEEPSETTINGS:
1919 case HDIO_SET_UNMASKINTR:
1920 case HDIO_SET_NOWERR:
1921 if (arg > 1)
1922 return -EINVAL;
1923 case HDIO_SET_CHIPSET:
1924 if (!suser())
1925 return -EACCES;
1926 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1927 return -EINVAL;
1928 save_flags(flags);
1929 cli();
1930 switch (cmd) {
1931 case HDIO_SET_DMA:
1932 if (!(HWIF(drive)->dmaproc)) {
1933 restore_flags(flags);
1934 return -EPERM;
1935 }
1936 drive->using_dma = arg;
1937 break;
1938 case HDIO_SET_KEEPSETTINGS:
1939 drive->keep_settings = arg;
1940 break;
1941 case HDIO_SET_UNMASKINTR:
1942 if (arg && disallow_unmask) {
1943 restore_flags(flags);
1944 return -EPERM;
1945 }
1946 drive->unmask = arg;
1947 break;
1948 case HDIO_SET_NOWERR:
1949 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1950 break;
1951 case HDIO_SET_CHIPSET:
1952 drive->chipset = arg;
1953 drive->vlb_32bit = (arg & 1);
1954 drive->vlb_sync = (arg & 2) >> 1;
1955 #ifndef VLB_SYNC
1956 if (drive->vlb_sync)
1957 printk("%s: VLB_SYNC not supported by this kernel\n", drive->name);
1958 #endif
1959 break;
1960 }
1961 restore_flags(flags);
1962 return 0;
1963
1964 case HDIO_SET_MULTCOUNT:
1965 if (!suser())
1966 return -EACCES;
1967 if (MINOR(inode->i_rdev) & PARTN_MASK)
1968 return -EINVAL;
1969 if ((drive->id != NULL) && (arg > drive->id->max_multsect))
1970 return -EINVAL;
1971 save_flags(flags);
1972 cli();
1973 if (drive->special.b.set_multmode) {
1974 restore_flags(flags);
1975 return -EBUSY;
1976 }
1977 drive->mult_req = arg;
1978 drive->special.b.set_multmode = 1;
1979 restore_flags(flags);
1980 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
1981 return (drive->mult_count == arg) ? 0 : -EIO;
1982
1983 case HDIO_DRIVE_CMD:
1984 {
1985 unsigned long args;
1986
1987 if (NULL == (long *) arg)
1988 err = ide_do_drive_cmd(drive, &rq, ide_wait);
1989 else {
1990 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1991 {
1992 args = get_user((long *)arg);
1993 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1994 rq.buffer = (char *) &args;
1995 err = ide_do_drive_cmd(drive, &rq, ide_wait);
1996 put_user(args,(long *)arg);
1997 }
1998 }
1999 }
2000 return err;
2001 }
2002
2003 RO_IOCTLS(inode->i_rdev, arg);
2004
2005 default:
2006 #ifdef CONFIG_BLK_DEV_IDECD
2007 if (drive->media == ide_cdrom)
2008 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2009 #endif /* CONFIG_BLK_DEV_IDECD */
2010 #ifdef CONFIG_BLK_DEV_IDETAPE
2011 if (drive->media == ide_tape)
2012 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2013 #endif /* CONFIG_BLK_DEV_IDETAPE */
2014 return -EPERM;
2015 }
2016 }
2017
2018 static int ide_check_media_change (kdev_t i_rdev)
/* */
2019 {
2020 ide_drive_t *drive;
2021
2022 if ((drive = get_info_ptr(i_rdev)) == NULL)
2023 return -ENODEV;
2024 #ifdef CONFIG_BLK_DEV_IDECD
2025 if (drive->media == ide_cdrom)
2026 return ide_cdrom_check_media_change (drive);
2027 #endif /* CONFIG_BLK_DEV_IDECD */
2028 if (drive->removeable) /* for disks */
2029 return 1; /* always assume it was changed */
2030 return 0;
2031 }
2032
2033 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2034 {
2035 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2036
2037 if (byteswap) {
2038 /* convert from big-endian to host byte order */
2039 for (p = end ; p != s;) {
2040 unsigned short *pp = (unsigned short *) (p -= 2);
2041 *pp = ntohs(*pp);
2042 }
2043 }
2044
2045 /* strip leading blanks */
2046 while (s != end && *s == ' ')
2047 ++s;
2048
2049 /* compress internal blanks and strip trailing blanks */
2050 while (s != end && *s) {
2051 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2052 *p++ = *(s-1);
2053 }
2054
2055 /* wipe out trailing garbage */
2056 while (p != end)
2057 *p++ = '\0';
2058 }
2059
2060 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2061 {
2062 int bswap;
2063 struct hd_driveid *id;
2064 unsigned long capacity, check;
2065
2066 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2067 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2068 sti();
2069
2070 /*
2071 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2072 */
2073 if ((id->model[0] == 'P' && id->model[1] == 'M')
2074 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2075 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2076 drive->present = 0;
2077 return;
2078 }
2079
2080 /*
2081 * WIN_IDENTIFY returns little-endian info,
2082 * WIN_PIDENTIFY *usually* returns little-endian info.
2083 */
2084 bswap = 1;
2085 if (cmd == WIN_PIDENTIFY) {
2086 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2087 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2088 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2089 bswap = 0; /* Vertos drives may still be weird */
2090 }
2091 ide_fixstring (id->model, sizeof(id->model), bswap);
2092 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2093 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2094
2095 /*
2096 * Check for an ATAPI device
2097 */
2098
2099 if (cmd == WIN_PIDENTIFY) {
2100 byte type = (id->config >> 8) & 0x1f;
2101 printk("%s: %s, ATAPI ", drive->name, id->model);
2102 switch (type) {
2103 case 0: /* Early cdrom models used zero */
2104 case 5:
2105 #ifdef CONFIG_BLK_DEV_IDECD
2106 printk ("CDROM drive\n");
2107 drive->media = ide_cdrom;
2108 drive->present = 1;
2109 drive->removeable = 1;
2110 return;
2111 #else
2112 printk ("CDROM ");
2113 break;
2114 #endif /* CONFIG_BLK_DEV_IDECD */
2115 case 1:
2116 #ifdef CONFIG_BLK_DEV_IDETAPE
2117 printk ("TAPE drive\n");
2118 if (idetape_identify_device (drive,id)) {
2119 drive->media = ide_tape;
2120 drive->present = 1;
2121 drive->removeable = 1;
2122 }
2123 else {
2124 drive->present = 0;
2125 printk ("ide-tape: The tape is not supported by this version of the driver\n");
2126 }
2127 return;
2128 #else
2129 printk ("TAPE ");
2130 break;
2131 #endif /* CONFIG_BLK_DEV_IDETAPE */
2132 default:
2133 printk("Type %d - Unknown device\n", type);
2134 return;
2135 }
2136 printk("- not supported by this kernel\n");
2137 return;
2138 }
2139
2140 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2141 if (id->config & (1<<7)) { /* removeable disk ? */
2142 if (id->model[0] != 'W' || id->model[1] != 'D')
2143 drive->removeable = 1;
2144 }
2145
2146 drive->media = ide_disk;
2147 /* Extract geometry if we did not already have one for the drive */
2148 if (!drive->present) {
2149 drive->present = 1;
2150 drive->cyl = drive->bios_cyl = id->cyls;
2151 drive->head = drive->bios_head = id->heads;
2152 drive->sect = drive->bios_sect = id->sectors;
2153 }
2154 /* Handle logical geometry translation by the drive */
2155 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2156 && (id->cur_heads <= 16) && id->cur_sectors)
2157 {
2158 /*
2159 * Extract the physical drive geometry for our use.
2160 * Note that we purposely do *not* update the bios info.
2161 * This way, programs that use it (like fdisk) will
2162 * still have the same logical view as the BIOS does,
2163 * which keeps the partition table from being screwed.
2164 *
2165 * An exception to this is the cylinder count,
2166 * which we reexamine later on to correct for 1024 limitations.
2167 */
2168 drive->cyl = id->cur_cyls;
2169 drive->head = id->cur_heads;
2170 drive->sect = id->cur_sectors;
2171
2172 /* check for word-swapped "capacity" field in id information */
2173 capacity = drive->cyl * drive->head * drive->sect;
2174 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2175 if (check == capacity) { /* was it swapped? */
2176 /* yes, bring it into little-endian order: */
2177 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2178 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2179 }
2180 }
2181 /* Use physical geometry if what we have still makes no sense */
2182 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2183 drive->cyl = id->cyls;
2184 drive->head = id->heads;
2185 drive->sect = id->sectors;
2186 }
2187 /* Correct the number of cyls if the bios value is too small */
2188 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2189 if (drive->cyl > drive->bios_cyl)
2190 drive->bios_cyl = drive->cyl;
2191 }
2192
2193 (void) current_capacity (drive); /* initialize LBA selection */
2194
2195 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2196 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2197 drive->select.b.lba ? "LBA, " : "",
2198 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2199
2200 drive->mult_count = 0;
2201 if (id->max_multsect) {
2202 drive->mult_req = INITIAL_MULT_COUNT;
2203 if (drive->mult_req > id->max_multsect)
2204 drive->mult_req = id->max_multsect;
2205 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2206 drive->special.b.set_multmode = 1;
2207 }
2208 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2209 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2210 printk(", DMA");
2211 }
2212 printk("\n");
2213 #if SUPPORT_CMD640
2214 cmd640_tune_drive(drive); /* but can we tune a fish? */
2215 #endif
2216 }
2217
2218 /*
2219 * Delay for *at least* 10ms. As we don't know how much time is left
2220 * until the next tick occurs, we wait an extra tick to be safe.
2221 */
2222 static void delay_10ms (void)
/* */
2223 {
2224 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2225 while (timer > jiffies);
2226 }
2227
2228 /*
2229 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2230 * and waits for a response. It also monitors irqs while this is
2231 * happening, in hope of automatically determining which one is
2232 * being used by the interface.
2233 *
2234 * Returns: 0 device was identified
2235 * 1 device timed-out (no response to identify request)
2236 * 2 device aborted the command (refused to identify itself)
2237 */
2238 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2239 {
2240 int hd_status, rc;
2241 unsigned long timeout;
2242 int irqs = 0;
2243
2244 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2245 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2246 irqs = probe_irq_on(); /* start monitoring irqs */
2247 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2248 }
2249
2250 delay_10ms(); /* take a deep breath */
2251 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2252 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2253 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2254 } else
2255 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2256
2257 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2258 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2259 timeout += jiffies;
2260 do {
2261 if (jiffies > timeout) {
2262 if (!HWIF(drive)->irq)
2263 (void) probe_irq_off(irqs);
2264 return 1; /* drive timed-out */
2265 }
2266 delay_10ms(); /* give drive a breather */
2267 } while (IN_BYTE(hd_status) & BUSY_STAT);
2268
2269 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2270 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2271 cli(); /* some systems need this */
2272 do_identify(drive, cmd); /* drive returned ID */
2273 rc = 0; /* success */
2274 } else
2275 rc = 2; /* drive refused ID */
2276 if (!HWIF(drive)->irq) {
2277 irqs = probe_irq_off(irqs); /* get irq number */
2278 if (irqs > 0)
2279 HWIF(drive)->irq = irqs;
2280 else /* Mmmm.. multiple IRQs */
2281 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2282 }
2283 return rc;
2284 }
2285
2286 /*
2287 * do_probe() has the difficult job of finding a drive if it exists,
2288 * without getting hung up if it doesn't exist, without trampling on
2289 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2290 *
2291 * If a drive is "known" to exist (from CMOS or kernel parameters),
2292 * but does not respond right away, the probe will "hang in there"
2293 * for the maximum wait time (about 30 seconds), otherwise it will
2294 * exit much more quickly.
2295 *
2296 * Returns: 0 device was identified
2297 * 1 device timed-out (no response to identify request)
2298 * 2 device aborted the command (refused to identify itself)
2299 * 3 bad status from device (possible for ATAPI drives)
2300 * 4 probe was not attempted because failure was obvious
2301 */
2302 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2303 {
2304 int rc;
2305 #ifdef CONFIG_BLK_DEV_IDEATAPI
2306 if (drive->present) { /* avoid waiting for inappropriate probes */
2307 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2308 return 4;
2309 }
2310 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2311 #ifdef DEBUG
2312 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2313 drive->name, drive->present, drive->media,
2314 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2315 #endif
2316 #if SUPPORT_HT6560B
2317 if (HWIF(drive)->select)
2318 ide_hwif_select (HWIF(drive));
2319 #endif
2320 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2321 delay_10ms(); /* wait for BUSY_STAT */
2322 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2323 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2324 return 3; /* no i/f present: avoid killing ethernet cards */
2325 }
2326
2327 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2328 || drive->present || cmd == WIN_PIDENTIFY)
2329 {
2330 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2331 rc = try_to_identify(drive,cmd); /* failed: try again */
2332 if (rc == 1)
2333 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2334 (void) GET_STAT(); /* ensure drive irq is clear */
2335 } else {
2336 rc = 3; /* not present or maybe ATAPI */
2337 }
2338 if (drive->select.b.unit != 0) {
2339 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2340 delay_10ms();
2341 (void) GET_STAT(); /* ensure drive irq is clear */
2342 }
2343 return rc;
2344 }
2345
2346 /*
2347 * probe_for_drive() tests for existance of a given drive using do_probe().
2348 *
2349 * Returns: 0 no device was found
2350 * 1 device was found (note: drive->present might still be 0)
2351 */
2352 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2353 {
2354 if (drive->noprobe) /* skip probing? */
2355 return drive->present;
2356 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2357 #ifdef CONFIG_BLK_DEV_IDEATAPI
2358 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2359 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2360 }
2361 if (!drive->present)
2362 return 0; /* drive not found */
2363 if (drive->id == NULL) { /* identification failed? */
2364 if (drive->media == ide_disk) {
2365 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2366 drive->name, drive->cyl, drive->head, drive->sect);
2367 }
2368 #ifdef CONFIG_BLK_DEV_IDECD
2369 else if (drive->media == ide_cdrom) {
2370 printk("%s: ATAPI cdrom (?)\n", drive->name);
2371 }
2372 #endif /* CONFIG_BLK_DEV_IDECD */
2373 else {
2374 drive->present = 0; /* nuke it */
2375 return 1; /* drive was found */
2376 }
2377 }
2378 if (drive->media == ide_disk && !drive->select.b.lba) {
2379 if (!drive->head || drive->head > 16) {
2380 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2381 drive->name, drive->head);
2382 drive->present = 0;
2383 }
2384 }
2385 return 1; /* drive was found */
2386 }
2387
2388 /*
2389 * This routine only knows how to look for drive units 0 and 1
2390 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2391 */
2392 static void probe_for_drives (ide_hwif_t *hwif)
/* */
2393 {
2394 unsigned int unit;
2395
2396 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2397 int msgout = 0;
2398 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2399 ide_drive_t *drive = &hwif->drives[unit];
2400 if (drive->present) {
2401 drive->present = 0;
2402 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2403 msgout = 1;
2404 }
2405 }
2406 if (!msgout)
2407 printk("%s: ports already in use, skipping probe\n", hwif->name);
2408 } else {
2409 unsigned long flags;
2410 save_flags(flags);
2411
2412 #if (MAX_DRIVES > 2)
2413 printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2414 #endif
2415 sti(); /* needed for jiffies and irq probing */
2416 /*
2417 * Second drive should only exist if first drive was found,
2418 * but a lot of cdrom drives seem to be configured as slave-only
2419 */
2420 for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2421 ide_drive_t *drive = &hwif->drives[unit];
2422 (void) probe_for_drive (drive);
2423 }
2424 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2425 ide_drive_t *drive = &hwif->drives[unit];
2426 if (drive->present) {
2427 hwif->present = 1;
2428 request_region(hwif->io_base, 8, hwif->name);
2429 request_region(hwif->ctl_port, 1, hwif->name);
2430 break;
2431 }
2432 }
2433 restore_flags(flags);
2434 }
2435 }
2436
2437 #if SUPPORT_DTC2278
2438 /*
2439 * From: andy@cercle.cts.com (Dyan Wile)
2440 *
2441 * Below is a patch for DTC-2278 - alike software-programmable controllers
2442 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
2443 * the primary (EIDE). You may probably have to enable the 32-bit support to
2444 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
2445 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
2446 * filesystem corrupted with -u1, but under heavy disk load only :-)
2447 *
2448 * From: mlord@bnr.ca -- this chipset is now forced to use the "serialize" feature,
2449 * which hopefully will make it more reliable to use.. maybe it has the same bugs
2450 * as the CMD640B and RZ1000 ??
2451 */
2452
2453 #if SET_DTC2278_MODE4
2454 static void sub22 (char b, char c)
/* */
2455 {
2456 int i;
2457
2458 for(i = 0; i < 3; ++i) {
2459 inb(0x3f6);
2460 outb_p(b,0xb0);
2461 inb(0x3f6);
2462 outb_p(c,0xb4);
2463 inb(0x3f6);
2464 if(inb(0xb4) == c) {
2465 outb_p(7,0xb0);
2466 inb(0x3f6);
2467 return; /* success */
2468 }
2469 }
2470 }
2471 #endif /* SET_DTC2278_MODE4 */
2472
2473 static void init_dtc2278 (void)
/* */
2474 {
2475 unsigned long flags;
2476
2477 save_flags(flags);
2478 cli();
2479 #if SET_DTC2278_MODE4
2480 /*
2481 * This enables PIO mode4 (3?) on the first interface
2482 */
2483 sub22(1,0xc3);
2484 sub22(0,0xa0);
2485 #endif /* SET_DTC2278_MODE4 */
2486 /*
2487 * This enables the second interface
2488 */
2489 outb_p(4,0xb0);
2490 inb(0x3f6);
2491 outb_p(0x20,0xb4);
2492 inb(0x3f6);
2493 restore_flags(flags);
2494 }
2495 #endif /* SUPPORT_DTC2278 */
2496
2497 #ifdef SUPPORT_QD6580
2498 /*
2499 * QDI QD6580 EIDE controller fast support by Colten Edwards.
2500 * no net access but I can be reached at pje120@cs.usask.ca
2501 *
2502 * I suppose that a IOCTL could be used for this and other
2503 * cards like it to modify the speed using hdparm. Someday..
2504 */
2505 static void init_qd6580 (void)
/* */
2506 {
2507 unsigned long flags;
2508
2509 /* looks like 0x4f is fast
2510 * 0x3f is medium
2511 * 0x2f is slower
2512 * 0x1f is slower yet
2513 * ports are 0xb0 0xb2 and 0xb3
2514 */
2515
2516 save_flags(flags);
2517 cli();
2518 outb_p(0x8d,0xb0);
2519 outb_p(0x0 ,0xb2);
2520 outb_p(0x4f,0xb3); /* select "fast" 0x4f */
2521 inb(0x3f6);
2522 restore_flags(flags);
2523 }
2524 #endif /* SUPPORT_QD6580 */
2525
2526 #ifdef SUPPORT_UMC8672
2527 #include "umc8672.c" /* until we tidy up the interface some more */
2528 #endif
2529
2530 #if SUPPORT_CMD640
2531 #include "cmd640.c" /* until we tidy up the interface some more */
2532 #endif
2533
2534 /*
2535 * stridx() returns the offset of c within s,
2536 * or -1 if c is '\0' or not found within s.
2537 */
2538 static int stridx (const char *s, char c)
/* */
2539 {
2540 char *i = strchr(s, c);
2541 return (i && c) ? i - s : -1;
2542 }
2543
2544 /*
2545 * match_parm() does parsing for ide_setup():
2546 *
2547 * 1. the first char of s must be '='.
2548 * 2. if the remainder matches one of the supplied keywords,
2549 * the index (1 based) of the keyword is negated and returned.
2550 * 3. if the remainder is a series of no more than max_vals numbers
2551 * separated by commas, the numbers are saved in vals[] and a
2552 * count of how many were saved is returned. Base10 is assumed,
2553 * and base16 is allowed when prefixed with "0x".
2554 * 4. otherwise, zero is returned.
2555 */
2556 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2557 {
2558 static const char *decimal = "0123456789";
2559 static const char *hex = "0123456789abcdef";
2560 int i, n;
2561
2562 if (*s++ == '=') {
2563 /*
2564 * Try matching against the supplied keywords,
2565 * and return -(index+1) if we match one
2566 */
2567 for (i = 0; *keywords != NULL; ++i) {
2568 if (!strcmp(s, *keywords++))
2569 return -(i+1);
2570 }
2571 /*
2572 * Look for a series of no more than "max_vals"
2573 * numeric values separated by commas, in base10,
2574 * or base16 when prefixed with "0x".
2575 * Return a count of how many were found.
2576 */
2577 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2578 vals[n] = i;
2579 while ((i = stridx(decimal, *++s)) >= 0)
2580 vals[n] = (vals[n] * 10) + i;
2581 if (*s == 'x' && !vals[n]) {
2582 while ((i = stridx(hex, *++s)) >= 0)
2583 vals[n] = (vals[n] * 0x10) + i;
2584 }
2585 if (++n == max_vals)
2586 break;
2587 if (*s == ',')
2588 ++s;
2589 }
2590 if (!*s)
2591 return n;
2592 }
2593 return 0; /* zero = nothing matched */
2594 }
2595
2596 /*
2597 * ide_setup() gets called VERY EARLY during initialization,
2598 * to handle kernel "command line" strings beginning with "hdx="
2599 * or "ide". Here is the complete set currently supported:
2600 *
2601 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2602 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2603 *
2604 * "hdx=noprobe" : drive may be present, but do not probe for it
2605 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2606 * "hdx=cdrom" : drive is present, and is a cdrom drive
2607 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2608 *
2609 * "idex=noprobe" : do not attempt to access/use this interface
2610 * "idex=base" : probe for an interface at the addr specified,
2611 * where "base" is usually 0x1f0 or 0x170
2612 * and "ctl" is assumed to be "base"+0x206
2613 * "idex=base,ctl" : specify both base and ctl
2614 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2615 *
2616 * The following two are valid ONLY on ide0 or ide1,
2617 * and the defaults for the base,ctl ports must not be altered.
2618 *
2619 * "idex=serialize" : do not overlap operations on ide0 and ide1.
2620 * "idex=dtc2278" : enables use of DTC2278 secondary i/f
2621 * "idex=ht6560b" : enables use of HT6560B secondary i/f
2622 * "idex=cmd640_vlb" : required for VLB cards with the CMD640 chip
2623 * (not for PCI -- automatically detected)
2624 *
2625 * This option is valid ONLY on ide0, and the defaults for the base,ctl ports
2626 * must not be altered.
2627 *
2628 * "ide0=qd6580" : select "fast" interface speed on a qd6580 interface
2629 */
2630 void ide_setup (char *s)
/* */
2631 {
2632 int vals[3];
2633 ide_hwif_t *hwif;
2634 ide_drive_t *drive;
2635 unsigned int hw, unit;
2636 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2637 const char max_hwif = '0' + (MAX_HWIFS - 1);
2638
2639 printk("ide_setup: %s", s);
2640 init_ide_data ();
2641
2642 /*
2643 * Look for drive options: "hdx="
2644 */
2645 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2646 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize", NULL};
2647 unit = s[2] - 'a';
2648 hw = unit / MAX_DRIVES;
2649 unit = unit % MAX_DRIVES;
2650 hwif = &ide_hwifs[hw];
2651 drive = &hwif->drives[unit];
2652 switch (match_parm(&s[3], hd_words, vals, 3)) {
2653 case -1: /* "noprobe" */
2654 drive->noprobe = 1;
2655 goto done;
2656 case -2: /* "nowerr" */
2657 drive->bad_wstat = BAD_R_STAT;
2658 hwif->noprobe = 0;
2659 goto done;
2660 case -3: /* "cdrom" */
2661 drive->present = 1;
2662 drive->media = ide_cdrom;
2663 hwif->noprobe = 0;
2664 goto done;
2665 case -4: /* "serialize" */
2666 printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
2667 goto do_serialize;
2668 case 3: /* cyl,head,sect */
2669 drive->media = ide_disk;
2670 drive->cyl = drive->bios_cyl = vals[0];
2671 drive->head = drive->bios_head = vals[1];
2672 drive->sect = drive->bios_sect = vals[2];
2673 drive->present = 1;
2674 hwif->noprobe = 0;
2675 goto done;
2676 default:
2677 goto bad_option;
2678 }
2679 }
2680 /*
2681 * Look for interface options: "idex="
2682 */
2683 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2684 const char *ide_words[] = {"noprobe", "serialize", "dtc2278", "ht6560b",
2685 "cmd640_vlb", "qd6580", "umc8672", NULL};
2686 hw = s[3] - '0';
2687 hwif = &ide_hwifs[hw];
2688
2689 switch (match_parm(&s[4], ide_words, vals, 3)) {
2690 #if SUPPORT_UMC8672
2691 case -7: /* "umc8672" */
2692 if (hw != 0) goto bad_hwif;
2693 init_umc8672();
2694 goto done;
2695 #endif /* SUPPORT_UMC8672 */
2696 #if SUPPORT_QD6580
2697 case -6: /* "qd6580" */
2698 if (hw != 0) goto bad_hwif;
2699 init_qd6580();
2700 goto done;
2701 #endif /* SUPPORT_QD6580 */
2702 #if SUPPORT_CMD640
2703 case -5: /* "cmd640_vlb" */
2704 if (hw > 1) goto bad_hwif;
2705 cmd640_vlb = 1;
2706 break;
2707 #endif /* SUPPORT_CMD640 */
2708 #if SUPPORT_HT6560B
2709 case -4: /* "ht6560b" */
2710 if (hw > 1) goto bad_hwif;
2711 /*
2712 * Using 0x1c and 0x1d apparently selects a
2713 * faster interface speed than 0x3c and 0x3d.
2714 * (bit5 (0x20) selects fast speed when set)
2715 * (bit0 (0x01) selects second interface)
2716 *
2717 * Need to set these per-drive, rather than
2718 * per-hwif, and also add an ioctl to select
2719 * between them.
2720 */
2721 if (check_region(0x3e6,1)) {
2722 printk(" -- HT6560 PORT 0x3e6 ALREADY IN USE");
2723 goto done;
2724 }
2725 request_region(0x3e6, 1, hwif->name);
2726 ide_hwifs[0].select = 0x1c;
2727 ide_hwifs[1].select = 0x3d;
2728 goto do_serialize;
2729 #endif /* SUPPORT_HT6560B */
2730 #if SUPPORT_DTC2278
2731 case -3: /* "dtc2278" */
2732 if (hw > 1) goto bad_hwif;
2733 init_dtc2278();
2734 goto do_serialize;
2735 #endif /* SUPPORT_DTC2278 */
2736 case -2: /* "serialize" */
2737 do_serialize:
2738 if (hw > 1) goto bad_hwif;
2739 serialized = 1;
2740 goto done;
2741 case -1: /* "noprobe" */
2742 hwif->noprobe = 1;
2743 goto done;
2744 case 1: /* base */
2745 vals[1] = vals[0] + 0x206; /* default ctl */
2746 case 2: /* base,ctl */
2747 vals[2] = 0; /* default irq = probe for it */
2748 case 3: /* base,ctl,irq */
2749 hwif->io_base = vals[0];
2750 hwif->ctl_port = vals[1];
2751 hwif->irq = vals[2];
2752 hwif->noprobe = 0;
2753 goto done;
2754 }
2755 }
2756 bad_option:
2757 printk(" -- BAD OPTION\n");
2758 return;
2759 bad_hwif:
2760 printk("-- NOT SUPPORTED ON ide%d", hw);
2761 done:
2762 printk("\n");
2763 }
2764
2765 /*
2766 * This routine is called from the partition-table code in genhd.c
2767 * to "convert" a drive to a logical geometry with fewer than 1024 cyls
2768 * It mimics the method used by Ontrack Disk Manager.
2769 */
2770 int ide_xlate_1024 (kdev_t i_rdev, int offset, const char *msg)
/* */
2771 {
2772 ide_drive_t *drive;
2773 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2774 const byte *heads = head_vals;
2775 unsigned long tracks;
2776
2777 if ((drive = get_info_ptr(i_rdev)) == NULL)
2778 return 0;
2779
2780 if (drive->id) {
2781 drive->cyl = drive->id->cyls;
2782 drive->head = drive->id->heads;
2783 drive->sect = drive->id->sectors;
2784 }
2785 drive->bios_cyl = drive->cyl;
2786 drive->bios_head = drive->head;
2787 drive->bios_sect = drive->sect;
2788 drive->special.b.set_geometry = 1;
2789
2790 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2791 drive->bios_sect = 63;
2792 while (drive->bios_cyl >= 1024) {
2793 drive->bios_head = *heads;
2794 drive->bios_cyl = tracks / drive->bios_head;
2795 if (0 == *++heads)
2796 break;
2797 }
2798 if (offset) {
2799 #if FAKE_FDISK_FOR_EZDRIVE
2800 if (offset == -1)
2801 drive->ezdrive = 1;
2802 else
2803 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2804 {
2805 drive->sect0 = 63;
2806 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2807 }
2808 }
2809 drive->part[0].nr_sects = current_capacity(drive);
2810 printk("%s [%d/%d/%d]", msg, drive->bios_cyl, drive->bios_head, drive->bios_sect);
2811 return 1;
2812 }
2813
2814 /*
2815 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2816 * controller that is BIOS compatible with ST-506, and thus showing up in our
2817 * BIOS table, but not register compatible, and therefore not present in CMOS.
2818 *
2819 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2820 * drives in the system -- the ones reflected as drive 1 or 2. The first
2821 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2822 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2823 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2824 * means we have an AT controller hard disk for that drive.
2825 *
2826 * Of course, there is no guarantee that either drive is actually on the
2827 * "primary" IDE interface, but we don't bother trying to sort that out here.
2828 * If a drive is not actually on the primary interface, then these parameters
2829 * will be ignored. This results in the user having to supply the logical
2830 * drive geometry as a boot parameter for each drive not on the primary i/f.
2831 *
2832 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2833 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2834 * for us during initialization. I have the necessary docs -- any takers? -ml
2835 */
2836
2837 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2838 {
2839 #ifdef __i386__
2840 extern struct drive_info_struct drive_info;
2841 byte cmos_disks, *BIOS = (byte *) &drive_info;
2842 int unit;
2843
2844 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2845 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2846 /* Extract drive geometry from CMOS+BIOS if not already setup */
2847 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2848 ide_drive_t *drive = &hwif->drives[unit];
2849 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2850 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2851 drive->head = drive->bios_head = *(BIOS+2);
2852 drive->sect = drive->bios_sect = *(BIOS+14);
2853 drive->ctl = *(BIOS+8);
2854 drive->present = 1;
2855 }
2856 BIOS += 16;
2857 }
2858 #endif
2859 }
2860
2861 /*
2862 * This routine sets up the irq for an ide interface, and creates a new
2863 * hwgroup for the irq/hwif if none was previously assigned.
2864 *
2865 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2866 * interrupts completely disabled. This can be bad for interrupt latency,
2867 * but anything else has led to problems on some machines. We re-enable
2868 * interrupts as much as we can safely do in most places.
2869 */
2870 static int init_irq (ide_hwif_t *hwif)
/* */
2871 {
2872 unsigned long flags;
2873 int irq = hwif->irq;
2874 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
2875
2876 save_flags(flags);
2877 cli();
2878
2879 /*
2880 * Grab the irq if we don't already have it from a previous hwif
2881 */
2882 if (hwgroup == NULL) {
2883 if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2884 restore_flags(flags);
2885 printk(" -- FAILED!");
2886 return 1;
2887 }
2888 }
2889 /*
2890 * Check for serialization with ide1.
2891 * This code depends on us having already taken care of ide1.
2892 */
2893 if (serialized && hwif->name[3] == '0' && ide_hwifs[1].present)
2894 hwgroup = ide_hwifs[1].hwgroup;
2895 /*
2896 * If this is the first interface in a group,
2897 * then we need to create the hwgroup structure
2898 */
2899 if (hwgroup == NULL) {
2900 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2901 hwgroup->hwif = hwif->next = hwif;
2902 hwgroup->rq = NULL;
2903 hwgroup->handler = NULL;
2904 hwgroup->drive = &hwif->drives[0];
2905 hwgroup->poll_timeout = 0;
2906 init_timer(&hwgroup->timer);
2907 hwgroup->timer.function = &timer_expiry;
2908 hwgroup->timer.data = (unsigned long) hwgroup;
2909 } else {
2910 hwif->next = hwgroup->hwif->next;
2911 hwgroup->hwif->next = hwif;
2912 }
2913 hwif->hwgroup = hwgroup;
2914 irq_to_hwgroup[irq] = hwgroup;
2915
2916 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2917
2918 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2919 hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
2920 if (hwgroup->hwif != hwif)
2921 printk(" (serialized with %s)", hwgroup->hwif->name);
2922 printk("\n");
2923 return 0;
2924 }
2925
2926 static struct file_operations ide_fops = {
2927 NULL, /* lseek - default */
2928 block_read, /* read - general block-dev read */
2929 block_write, /* write - general block-dev write */
2930 NULL, /* readdir - bad */
2931 NULL, /* select */
2932 ide_ioctl, /* ioctl */
2933 NULL, /* mmap */
2934 ide_open, /* open */
2935 ide_release, /* release */
2936 block_fsync /* fsync */
2937 ,NULL, /* fasync */
2938 ide_check_media_change, /* check_media_change */
2939 revalidate_disk /* revalidate */
2940 };
2941
2942 #ifdef CONFIG_PCI
2943
2944 void ide_pci_access_error (int rc)
/* */
2945 {
2946 printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
2947 }
2948
2949 #if SUPPORT_RZ1000 || SUPPORT_CMD640
2950 void buggy_interface_fallback (int rc)
/* */
2951 {
2952 ide_pci_access_error (rc);
2953 serialized = 1;
2954 disallow_unmask = 1;
2955 printk("serialized, disabled unmasking\n");
2956 }
2957 #endif /* SUPPORT_RZ1000 || SUPPORT_CMD640 */
2958
2959 #if SUPPORT_RZ1000
2960 void init_rz1000 (byte bus, byte fn)
/* */
2961 {
2962 int rc;
2963 unsigned short reg;
2964
2965 printk("ide: buggy RZ1000 interface: ");
2966 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, ®))) {
2967 ide_pci_access_error (rc);
2968 } else if (!(reg & 1)) {
2969 printk("not enabled\n");
2970 } else {
2971 if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
2972 || (rc = pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
2973 buggy_interface_fallback (rc);
2974 else
2975 printk("disabled read-ahead\n");
2976 }
2977 }
2978 #endif /* SUPPORT_RZ1000 */
2979
2980 typedef void (ide_pci_init_proc_t)(byte, byte);
2981
2982 /*
2983 * ide_probe_pci() scans PCI for a specific vendor/device function,
2984 * and invokes the supplied init routine for each instance detected.
2985 */
2986 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
2987 {
2988 unsigned long flags;
2989 unsigned index;
2990 byte fn, bus;
2991
2992 save_flags(flags);
2993 cli();
2994 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2995 init (bus, fn + func_adj);
2996 }
2997 restore_flags(flags);
2998 }
2999
3000 /*
3001 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3002 *
3003 * This routine should ideally be using pcibios_find_class() to find
3004 * all IDE interfaces, but that function causes some systems to "go weird".
3005 */
3006 static void ide_init_pci (void)
/* */
3007 {
3008 #if SUPPORT_RZ1000
3009 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3010 #endif
3011 #ifdef CONFIG_BLK_DEV_TRITON
3012 /*
3013 * Apparently the BIOS32 services on Intel motherboards are buggy,
3014 * and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3015 * So we instead search for PCI_DEVICE_ID_INTEL_82371_0, and then add 1.
3016 */
3017 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3018 #endif
3019 }
3020 #endif /* CONFIG_PCI */
3021
3022 /*
3023 * This is gets invoked once during initialization, to set *everything* up
3024 */
3025 int ide_init (void)
/* ![[last]](../icons/n_last.png)
*/
3026 {
3027 int h;
3028
3029 init_ide_data ();
3030 /*
3031 * First, we determine what hardware is present
3032 */
3033
3034 #ifdef CONFIG_PCI
3035 /*
3036 * Find/initialize PCI IDE interfaces
3037 */
3038 if (pcibios_present())
3039 ide_init_pci ();
3040 #endif /* CONFIG_PCI */
3041 #if SUPPORT_CMD640
3042 ide_probe_for_cmd640x();
3043 #endif
3044
3045 /*
3046 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3047 */
3048 for (h = 0; h < MAX_HWIFS; ++h) {
3049 ide_hwif_t *hwif = &ide_hwifs[h];
3050 if (!hwif->noprobe) {
3051 if (hwif->io_base == HD_DATA)
3052 probe_cmos_for_drives (hwif);
3053 probe_for_drives (hwif);
3054 }
3055 if (hwif->present) {
3056 if (!hwif->irq) {
3057 if (!(hwif->irq = default_irqs[h])) {
3058 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3059 hwif->present = 0;
3060 continue;
3061 }
3062 }
3063 #ifdef CONFIG_BLK_DEV_HD
3064 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3065 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3066 hwif->present = 0;
3067 }
3068 #endif /* CONFIG_BLK_DEV_HD */
3069 }
3070 }
3071
3072 /*
3073 * Now we try to set up irqs and major devices for what was found
3074 */
3075 for (h = MAX_HWIFS-1; h >= 0; --h) {
3076 void (*rfn)(void);
3077 ide_hwif_t *hwif = &ide_hwifs[h];
3078 if (!hwif->present)
3079 continue;
3080 hwif->present = 0; /* we set it back to 1 if all is ok below */
3081 switch (hwif->major) {
3082 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3083 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3084 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3085 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3086 default:
3087 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3088 continue;
3089 }
3090 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3091 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3092 } else if (init_irq (hwif)) {
3093 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3094 (void) unregister_blkdev (hwif->major, hwif->name);
3095 } else {
3096 init_gendisk(hwif);
3097 blk_dev[hwif->major].request_fn = rfn;
3098 read_ahead[hwif->major] = 8; /* (4kB) */
3099 hwif->present = 1; /* success */
3100 }
3101 }
3102
3103 #ifdef CONFIG_BLK_DEV_IDETAPE
3104 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3105 #endif /* CONFIG_BLK_DEV_IDETAPE */
3106
3107 return 0;
3108 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/