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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.14 Sep 14, 1995
3 *
4 * Copyright (C) 1994, 1995 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 * From hd.c:
18 * |
19 * | It traverses the request-list, using interrupts to jump between functions.
20 * | As nearly all functions can be called within interrupts, we may not sleep.
21 * | Special care is recommended. Have Fun!
22 * |
23 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
24 * |
25 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
26 * | in the early extended-partition checks and added DM partitions.
27 * |
28 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
29 * |
30 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
31 * | and general streamlining by Mark Lord (mlord@bnr.ca).
32 *
33 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
34 *
35 * Mark Lord (mlord@bnr.ca) (IDE Perf.Pkg)
36 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
37 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
38 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
39 *
40 * Maintained by Mark Lord (mlord@bnr.ca): ide.c, ide.h, triton.c, hd.c, ..
41 *
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
45 *
46 * Version 1.0 ALPHA initial code, primary i/f working okay
47 * Version 1.3 BETA dual i/f on shared irq tested & working!
48 * Version 1.4 BETA added auto probing for irq(s)
49 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
50 * ...
51 * Version 3.5 correct the bios_cyl field if it's too small
52 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
53 * Version 3.6 cosmetic corrections to comments and stuff
54 * (linux 1.1.77) reorganise probing code to make it understandable
55 * added halfway retry to probing for drive identification
56 * added "hdx=noprobe" command line option
57 * allow setting multmode even when identification fails
58 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
59 * increase DRQ_WAIT to eliminate nuisance messages
60 * wait for DRQ_STAT instead of DATA_READY during probing
61 * (courtesy of Gary Thomas gary@efland.UU.NET)
62 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
63 * update of ide-cd.c from Scott, allows blocksize=1024
64 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
65 * Version 3.9 don't use LBA if lba_capacity looks funny
66 * correct the drive capacity calculations
67 * fix probing for old Seagates without IDE_ALTSTATUS_REG
68 * fix byte-ordering for some NEC cdrom drives
69 * Version 3.10 disable multiple mode by default; was causing trouble
70 * Version 3.11 fix mis-identification of old WD disks as cdroms
71 * Version 3,12 simplify logic for selecting initial mult_count
72 * (fixes problems with buggy WD drives)
73 * Version 3.13 remove excess "multiple mode disabled" messages
74 * Version 3.14 fix ide_error() handling of BUSY_STAT
75 * fix byte-swapped cdrom strings (again.. arghh!)
76 * ignore INDEX bit when checking the ALTSTATUS reg
77 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
78 * ignore WRERR_STAT for non-write operations
79 * added vlb_sync support for DC-2000A & others,
80 * (incl. some Promise chips), courtesy of Frank Gockel
81 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
82 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
83 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
84 * add boot flag to "serialize" operation for CMD i/f
85 * add optional support for DTC2278 interfaces,
86 * courtesy of andy@cercle.cts.com (Dyan Wile).
87 * add boot flag to enable "dtc2278" probe
88 * add probe to avoid EATA (SCSI) interfaces,
89 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
90 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
91 * add flag to ignore WRERR_STAT for some drives
92 * courtesy of David.H.West@um.cc.umich.edu
93 * assembly syntax tweak to vlb_sync
94 * removeable drive support from scuba@cs.tu-berlin.de
95 * add transparent support for DiskManager-6.0x "Dynamic
96 * Disk Overlay" (DDO), most of this in in genhd.c
97 * eliminate "multiple mode turned off" message at boot
98 * Version 4.10 fix bug in ioctl for "hdparm -c3"
99 * fix DM6:DDO support -- now works with LILO, fdisk, ...
100 * don't treat some naughty WD drives as removeable
101 * Version 4.11 updated DM6 support using info provided by OnTrack
102 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
103 * added support for 3rd/4th/alternative IDE ports
104 * created ide.h; ide-cd.c now compiles separate from ide.c
105 * hopefully fixed infinite "unexpected_intr" from cdroms
106 * zillions of other changes and restructuring
107 * somehow reduced overall memory usage by several kB
108 * probably slowed things down slightly, but worth it
109 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
110 * was happening at various times/places: whenever the
111 * ide-interface's ctl_port was used to "mask" the irq,
112 * it also would trigger an edge in the process of masking
113 * which would result in a self-inflicted interrupt!!
114 * (such a stupid way to build a hardware interrupt mask).
115 * This is now fixed (after a year of head-scratching).
116 * Version 5.02 got rid of need for {enable,disable}_irq_list()
117 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
118 * removed PROBE_FOR_IRQS option -- no longer needed
119 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
120 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
121 * added more comments, cleaned up unexpected_intr()
122 * OOOPS! fixed null pointer problem in ide reset code
123 * added autodetect for Triton chipset -- no effect yet
124 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
125 * OOOPS! fixed bug in ide_do_request()
126 * added ATAPI reset sequence for cdroms
127 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
128 * some (mostly) cosmetic changes
129 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
130 * reworked PCI scanning code
131 * added automatic RZ1000 detection/support
132 * added automatic PCI CMD640 detection/support
133 * added option for VLB CMD640 support
134 * tweaked probe to find cdrom on hdb with disks on hda,hdc
135 * Version 5.12 some performance tuning
136 * added message to alert user to bad /dev/hd[cd] entries
137 * OOOPS! fixed bug in atapi reset
138 * driver now forces "serialize" again for all cmd640 chips
139 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
140 * made do_drive_cmd() into public ide_do_drive_cmd()
141 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
142 * fixed ht6560b support
143 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
144 * don't bother invalidating nonexistent partitions
145 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
146 * added & tested full EZ-DRIVE support -- don't use LILO!
147 * don't enable 2nd CMD640 PCI port during init - conflict
148 *
149 * Driver compile-time options are in ide.h
150 *
151 * To do, in likely order of completion:
152 * - add ioctls to get/set interface timings on cmd640, ht6560b, triton
153 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
154 * - improved CMD support: handed this off to someone else
155 * - find someone to work on IDE *tape drive* support
156 */
157
158 #undef REALLY_SLOW_IO /* most systems can safely undef this */
159
160 #include <linux/config.h>
161 #include <linux/types.h>
162 #include <linux/string.h>
163 #include <linux/kernel.h>
164 #include <linux/delay.h>
165 #include <linux/timer.h>
166 #include <linux/mm.h>
167 #include <linux/ioport.h>
168 #include <linux/interrupt.h>
169 #include <linux/major.h>
170 #include <linux/blkdev.h>
171 #include <linux/errno.h>
172 #include <linux/hdreg.h>
173 #include <linux/genhd.h>
174 #include <linux/malloc.h>
175
176 #include <asm/byteorder.h>
177 #include <asm/irq.h>
178 #include <asm/segment.h>
179 #include <asm/io.h>
180
181 #ifdef CONFIG_PCI
182 #include <linux/bios32.h>
183 #include <linux/pci.h>
184 #endif /* CONFIG_PCI */
185
186 #include "ide.h"
187
188 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* hwif info */
189 static ide_hwgroup_t *irq_to_hwgroup [16];
190 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
191
192 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
193 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
194 static int single_threaded = 0; /* "serialize" option */
195 static int disallow_unmask = 0; /* for buggy hardware */
196
197 #if (DISK_RECOVERY_TIME > 0)
198 /*
199 * For really screwy hardware (hey, at least it *can* be used with Linux)
200 * we can enforce a minimum delay time between successive operations.
201 */
202 static unsigned long read_timer(void)
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203 {
204 unsigned long t, flags;
205 int i;
206
207 save_flags(flags);
208 cli();
209 t = jiffies * 11932;
210 outb_p(0, 0x43);
211 i = inb_p(0x40);
212 i |= inb(0x40) << 8;
213 restore_flags(flags);
214 return (t - i);
215 }
216
217 void ide_set_recovery_timer (ide_hwif_t *hwif)
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*/
218 {
219 hwif->last_time = read_timer();
220 }
221 #endif /* DISK_RECOVERY_TIME */
222
223 /*
224 * init_ide_data() sets reasonable default values into all fields
225 * of all instances of the hwifs and drives, but only on the first call.
226 * Subsequent calls have no effect (they don't wipe out anything).
227 *
228 * This routine is normally called at driver initialization time,
229 * but may also be called MUCH earlier during kernel "command-line"
230 * parameter processing. As such, we cannot depend on any other parts
231 * of the kernel (such as memory allocation) to be functioning yet.
232 *
233 * This is too bad, as otherwise we could dynamically allocate the
234 * ide_drive_t structs as needed, rather than always consuming memory
235 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
236 */
237 #define MAGIC_COOKIE 0x12345678
238 static void init_ide_data (void)
/* */
239 {
240 byte *p;
241 unsigned int h, unit;
242 static unsigned long magic_cookie = MAGIC_COOKIE;
243
244 if (magic_cookie != MAGIC_COOKIE)
245 return; /* already initialized */
246 magic_cookie = 0;
247
248 for (h = 0; h < 16; ++h)
249 irq_to_hwgroup[h] = NULL;
250
251 /* bulk initialize hwif & drive info with zeros */
252 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
253 do {
254 *--p = 0;
255 } while (p > (byte *) ide_hwifs);
256
257 for (h = 0; h < MAX_HWIFS; ++h) {
258 ide_hwif_t *hwif = &ide_hwifs[h];
259
260 /* fill in any non-zero initial values */
261 hwif->noprobe = (h > 1);
262 hwif->io_base = default_io_base[h];
263 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
264 #ifdef CONFIG_BLK_DEV_HD
265 if (hwif->io_base == HD_DATA)
266 hwif->noprobe = 1; /* may be overriden by ide_setup() */
267 #endif /* CONFIG_BLK_DEV_HD */
268 hwif->major = ide_hwif_to_major[h];
269 hwif->name[0] = 'i';
270 hwif->name[1] = 'd';
271 hwif->name[2] = 'e';
272 hwif->name[3] = '0' + h;
273
274 for (unit = 0; unit < MAX_DRIVES; ++unit) {
275 ide_drive_t *drive = &hwif->drives[unit];
276
277 /* fill in any non-zero initial values */
278 drive->select.all = (unit<<4)|0xa0;
279 drive->hwif = hwif;
280 drive->ctl = 0x08;
281 drive->ready_stat = READY_STAT;
282 drive->bad_wstat = BAD_W_STAT;
283 drive->special.b.recalibrate = 1;
284 drive->special.b.set_geometry = 1;
285 drive->name[0] = 'h';
286 drive->name[1] = 'd';
287 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
288 }
289 }
290 }
291
292 #define VLB_SYNC 1
293 /*
294 * Some localbus EIDE interfaces require a special access sequence
295 * when using 32-bit I/O instructions to transfer data. We call this
296 * the "vlb_sync" sequence, which consists of three successive reads
297 * of the sector count register location, with interrupts disabled
298 * to ensure that the reads all happen together.
299 */
300 static inline void do_vlb_sync (unsigned short port) {
/* */
301 (void) inb (port);
302 (void) inb (port);
303 (void) inb (port);
304 }
305
306 /*
307 * This is used for most PIO data transfers *from* the IDE interface
308 */
309 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
310 {
311 unsigned short io_base = HWIF(drive)->io_base;
312 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
313
314 if (drive->vlb_32bit) {
315 #ifdef VLB_SYNC
316 if (drive->vlb_sync) {
317 cli();
318 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
319 insl(data_reg, buffer, wcount);
320 if (drive->unmask)
321 sti();
322 } else
323 #endif /* VLB_SYNC */
324 insl(data_reg, buffer, wcount);
325 } else
326 insw(data_reg, buffer, wcount<<1);
327 }
328
329 /*
330 * This is used for most PIO data transfers *to* the IDE interface
331 */
332 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
333 {
334 unsigned short io_base = HWIF(drive)->io_base;
335 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
336
337 if (drive->vlb_32bit) {
338 #ifdef VLB_SYNC
339 if (drive->vlb_sync) {
340 cli();
341 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
342 outsl(data_reg, buffer, wcount);
343 if (drive->unmask)
344 sti();
345 } else
346 #endif /* VLB_SYNC */
347 outsl(data_reg, buffer, wcount);
348 } else
349 outsw(data_reg, buffer, wcount<<1);
350 }
351
352 #if SUPPORT_HT6560B
353 /*
354 * This routine handles interface switching for the peculiar hardware design
355 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
356 * The HT-6560B can only enable one IDE port at a time, and requires a
357 * silly sequence (below) whenever we switch between primary and secondary.
358 *
359 * Apparently, systems with multiple CMD640 chips may need something similar..
360 *
361 * This algorithm courtesy of malafoss@snakemail.hut.fi
362 */
363
364 void ide_hwif_select (ide_hwif_t *hwif)
/* */
365 {
366 static byte current_select = 0;
367
368 if (hwif->select != current_select) {
369 unsigned long flags;
370 save_flags (flags);
371 cli();
372 current_select = hwif->select;
373 (void) inb(0x3e6);
374 (void) inb(0x3e6);
375 (void) inb(0x3e6);
376 (void) inb(0x3e6);
377 outb(current_select,0x3e6);
378 restore_flags (flags);
379 }
380 }
381 #endif /* SUPPORT_HT6560B */
382
383 /*
384 * This should get invoked any time we exit the driver to
385 * wait for an interrupt response from a drive. handler() points
386 * at the appropriate code to handle the next interrupt, and a
387 * timer is started to prevent us from waiting forever in case
388 * something goes wrong (see the timer_expiry() handler later on).
389 */
390 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler)
/* */
391 {
392 ide_hwgroup_t *hwgroup = HWGROUP(drive);
393 #ifdef DEBUG
394 if (hwgroup->handler != NULL)
395 printk("%s: ide_set_handler: old handler not null\n", drive->name);
396 #endif
397 hwgroup->handler = handler;
398 hwgroup->timer.expires = jiffies + WAIT_CMD;
399 add_timer(&(hwgroup->timer));
400 }
401
402 /*
403 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
404 * value for this drive (from its reported identification information).
405 *
406 * Returns: 1 if lba_capacity looks sensible
407 * 0 otherwise
408 */
409 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
410 {
411 unsigned long lba_sects = id->lba_capacity;
412 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
413 unsigned long _10_percent = chs_sects / 10;
414
415 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
416 if ((lba_sects - chs_sects) < _10_percent)
417 return 1; /* lba_capacity is good */
418
419 /* some drives have the word order reversed */
420 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
421 if ((lba_sects - chs_sects) < _10_percent) {
422 id->lba_capacity = lba_sects; /* fix it */
423 return 1; /* lba_capacity is (now) good */
424 }
425 return 0; /* lba_capacity value is bad */
426 }
427
428 /*
429 * current_capacity() returns the capacity (in sectors) of a drive
430 * according to its current geometry/LBA settings.
431 */
432 static unsigned long current_capacity (ide_drive_t *drive)
/* */
433 {
434 struct hd_driveid *id = drive->id;
435 unsigned long capacity;
436
437 if (!drive->present)
438 return 0;
439 if (drive->media != disk)
440 return 0x1fffff; /* cdrom */
441 /* Determine capacity, and use LBA if the drive properly supports it */
442 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
443 drive->select.b.lba = 1;
444 capacity = id->lba_capacity;
445 } else {
446 drive->select.b.lba = 0;
447 capacity = drive->cyl * drive->head * drive->sect;
448 }
449 return (capacity - drive->sect0);
450 }
451
452 /*
453 * ide_geninit() is called exactly *once* for each major, from genhd.c,
454 * at the beginning of the initial partition check for the drives.
455 */
456 static void ide_geninit (struct gendisk *gd)
/* */
457 {
458 unsigned int unit;
459 ide_hwif_t *hwif = gd->real_devices;
460
461 for (unit = 0; unit < gd->nr_real; ++unit) {
462 ide_drive_t *drive = &hwif->drives[unit];
463 #ifdef CONFIG_BLK_DEV_IDECD
464 if (drive->present && drive->media == cdrom)
465 ide_cdrom_setup(drive);
466 #endif /* CONFIG_BLK_DEV_IDECD */
467 drive->part[0].nr_sects = current_capacity(drive);
468 if (!drive->present || drive->media != disk) {
469 drive->part[0].start_sect = -1; /* skip partition check */
470 }
471 }
472 /*
473 * The partition check in genhd.c needs this string to identify
474 * our minor devices by name for display purposes.
475 * Note that doing this will prevent us from working correctly
476 * if ever called a second time for this major (never happens).
477 */
478 gd->real_devices = hwif->drives[0].name; /* name of first drive */
479 }
480
481 /*
482 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
483 * after probing for drives, to allocate partition tables and other data
484 * structures needed for the routines in genhd.c. ide_geninit() gets called
485 * somewhat later, during the partition check.
486 */
487 static void init_gendisk (ide_hwif_t *hwif)
/* */
488 {
489 struct gendisk *gd;
490 unsigned int unit, units, minors;
491 int *bs;
492
493 /* figure out maximum drive number on the interface */
494 for (units = MAX_DRIVES; units > 0; --units) {
495 if (hwif->drives[units-1].present)
496 break;
497 }
498 minors = units * (1<<PARTN_BITS);
499 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
500 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
501 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
502 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
503
504 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
505 blksize_size[hwif->major] = bs;
506 for (unit = 0; unit < minors; ++unit)
507 *bs++ = BLOCK_SIZE;
508
509 for (unit = 0; unit < units; ++unit)
510 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
511
512 gd->major = hwif->major; /* our major device number */
513 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
514 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
515 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
516 gd->max_nr = units; /* max num real drives */
517 gd->nr_real = units; /* current num real drives */
518 gd->init = ide_geninit; /* initialization function */
519 gd->real_devices= hwif; /* ptr to internal data */
520
521 gd->next = gendisk_head; /* link new major into list */
522 hwif->gd = gendisk_head = gd;
523 }
524
525 static void unexpected_intr (int, ide_hwgroup_t *);
526 /*
527 * reset_ihandler() is a dummy interrupt handler which we install during
528 * an ide interface reset operation. This prevents other devices in the
529 * same hwgroup from being serviced while we play around with shared resources.
530 * If it ever gets invoked, we call unexpected_intr(), which treats the event
531 * the same as a timer_expiry().
532 */
533 static void reset_ihandler (ide_drive_t *drive)
/* */
534 {
535 unsigned long flags;
536
537 save_flags(flags);
538 cli();
539 unexpected_intr (HWIF(drive)->irq, HWGROUP(drive));
540 restore_flags(flags);
541 }
542
543 /*
544 * start_reset_timer() sets up a timer event for 50ms in the future,
545 * to poll for completion of an ide reset operation (no interrupt to help us).
546 */
547 static void start_reset_timer (ide_hwif_t *hwif)
/* */
548 {
549 ide_hwgroup_t *hwgroup = hwif->hwgroup;
550
551 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE; /* max waiting time */
552 hwgroup->handler = &reset_ihandler; /* dummy irq handler */
553 hwgroup->timer.expires = jiffies + (HZ/20); /* polling interval */
554 add_timer(&(hwgroup->timer));
555 }
556
557 #ifdef CONFIG_BLK_DEV_IDECD
558 /*
559 * atapi_reset_handler() gets invoked to poll the interface for completion every 50ms
560 * during an atapi drive reset operation. If the drive has not yet responded,
561 * and we have not yet hit our maximum waiting time, then the timer is restarted
562 * for another 50ms.
563 *
564 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
565 */
566 static int atapi_reset_handler (ide_hwgroup_t *hwgroup)
/* */
567 {
568 ide_hwif_t *hwif = hwgroup->hwif;
569 ide_drive_t *drive = hwgroup->drive;
570 byte stat;
571
572 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
573 udelay (10);
574
575 if (!OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
576 if (jiffies < hwgroup->reset_timeout) {
577 start_reset_timer (hwif);
578 return 1;
579 }
580 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
581 return ide_do_reset (drive); /* do it the old fashioned way */
582 }
583 hwgroup->doing_atapi_reset = 0;
584 hwgroup->handler = NULL; /* allow new requests to be processed */
585 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
586 printk("%s: ATAPI reset complete\n", drive->name);
587 return 0;
588 }
589 #endif /* CONFIG_BLK_DEV_IDECD */
590
591 /*
592 * reset_handler() gets invoked to poll the interface for completion every 50ms
593 * during an ide reset operation. If the drives have not yet responded,
594 * and we have not yet hit our maximum waiting time, then the timer is restarted
595 * for another 50ms.
596 *
597 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
598 */
599 static int reset_handler (ide_hwgroup_t *hwgroup)
/* */
600 {
601 ide_hwif_t *hwif = hwgroup->hwif;
602 ide_drive_t *drive = hwgroup->drive;
603 byte tmp;
604
605 #ifdef CONFIG_BLK_DEV_IDECD
606 if (hwgroup->doing_atapi_reset)
607 return atapi_reset_handler(hwgroup);
608 #endif /* CONFIG_BLK_DEV_IDECD */
609
610 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
611 if (jiffies < hwgroup->reset_timeout) {
612 start_reset_timer (hwif);
613 return 1;
614 }
615 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
616 } else {
617 printk("%s: reset: ", hwif->name);
618 if ((tmp = GET_ERR()) == 1)
619 printk("success\n");
620 else {
621 printk("master: ");
622 switch (tmp & 0x7f) {
623 case 1: printk("passed");
624 break;
625 case 2: printk("formatter device error");
626 break;
627 case 3: printk("sector buffer error");
628 break;
629 case 4: printk("ECC circuitry error");
630 break;
631 case 5: printk("controlling MPU error");
632 break;
633 default:printk("error (0x%02x?)", tmp);
634 }
635 if (tmp & 0x80)
636 printk("; slave: failed");
637 printk("\n");
638 }
639 }
640 hwgroup->handler = NULL; /* allow new requests to be processed */
641 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
642 return 0;
643 }
644
645 /*
646 * ide_do_reset() attempts to recover a confused drive by resetting it.
647 * Unfortunately, resetting a disk drive actually resets all devices on
648 * the same interface, so it can really be thought of as resetting the
649 * interface rather than resetting the drive.
650 *
651 * ATAPI devices have their own reset mechanism which allows them to be
652 * individually reset without clobbering other devices on the same interface.
653 *
654 * Unfortunately, the IDE interface does not generate an interrupt to let
655 * us know when the reset operation has finished, so we must poll for this.
656 * Equally poor, though, is the fact that this may a very long time to complete,
657 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
658 * we set a timer to poll at 50ms intervals.
659 */
660 int ide_do_reset (ide_drive_t *drive)
/* */
661 {
662 unsigned int unit;
663 unsigned long flags;
664 ide_hwif_t *hwif = HWIF(drive);
665 ide_hwgroup_t *hwgroup = HWGROUP(drive);
666
667 save_flags(flags);
668 cli(); /* Why ? */
669
670 #ifdef CONFIG_BLK_DEV_IDECD
671 /* For an ATAPI device, first try an ATAPI SRST. */
672 if (drive->media == cdrom) {
673 if (!hwgroup->doing_atapi_reset) {
674 hwgroup->doing_atapi_reset = 1;
675 if (!drive->keep_settings)
676 drive->unmask = 0;
677 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
678 udelay (20);
679 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
680 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
681 start_reset_timer (hwif); /* begin periodic polling */
682 restore_flags (flags);
683 return 1;
684 }
685 }
686 hwgroup->doing_atapi_reset = 0;
687 #endif /* CONFIG_BLK_DEV_IDECD */
688
689 /*
690 * First, reset any device state data we were maintaining
691 * for any of the drives on this interface.
692 */
693 for (unit = 0; unit < MAX_DRIVES; ++unit) {
694 ide_drive_t *rdrive = &hwif->drives[unit];
695 rdrive->special.b.set_geometry = 1;
696 rdrive->special.b.recalibrate = 1;
697 rdrive->special.b.set_multmode = 0;
698 if (OK_TO_RESET_CONTROLLER)
699 rdrive->mult_count = 0;
700 if (!rdrive->keep_settings) {
701 rdrive->mult_req = 0;
702 rdrive->unmask = 0;
703 }
704 if (rdrive->mult_req != rdrive->mult_count)
705 rdrive->special.b.set_multmode = 1;
706 }
707
708 #if OK_TO_RESET_CONTROLLER
709 /*
710 * Note that we also set nIEN while resetting the device,
711 * to mask unwanted interrupts from the interface during the reset.
712 * However, due to the design of PC hardware, this will cause an
713 * immediate interrupt due to the edge transition it produces.
714 * This single interrupt gives us a "fast poll" for drives that
715 * recover from reset very quickly, saving us the first 50ms wait time.
716 */
717 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
718 udelay(5); /* more than enough time */
719 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
720 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
721 start_reset_timer (hwif); /* begin periodic polling */
722 #endif /* OK_TO_RESET_CONTROLLER */
723
724 restore_flags (flags);
725 return OK_TO_RESET_CONTROLLER; /* 1 = we are waiting, 0 = done */
726 }
727
728 /*
729 * Clean up after success/failure of an explicit (ioctl) drive cmd
730 */
731 static void end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
732 {
733 unsigned long flags;
734 struct request *rq = HWGROUP(drive)->rq;
735 byte *args = (byte *) rq->buffer;
736
737 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
738 if (args) {
739 args[0] = stat;
740 args[1] = err;
741 args[2] = IN_BYTE(IDE_NSECTOR_REG);
742 }
743 save_flags(flags);
744 cli();
745 up(rq->sem);
746 HWGROUP(drive)->rq = NULL;
747 restore_flags(flags);
748 }
749
750 /*
751 * Error reporting, in human readable form (luxurious, but a memory hog).
752 */
753 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
754 {
755 unsigned long flags;
756 byte err = 0;
757
758 save_flags (flags);
759 sti();
760 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
761 #if FANCY_STATUS_DUMPS
762 if (drive->media == disk) {
763 printk(" { ");
764 if (stat & BUSY_STAT)
765 printk("Busy ");
766 else {
767 if (stat & READY_STAT) printk("DriveReady ");
768 if (stat & WRERR_STAT) printk("DeviceFault ");
769 if (stat & SEEK_STAT) printk("SeekComplete ");
770 if (stat & DRQ_STAT) printk("DataRequest ");
771 if (stat & ECC_STAT) printk("CorrectedError ");
772 if (stat & INDEX_STAT) printk("Index ");
773 if (stat & ERR_STAT) printk("Error ");
774 }
775 printk("}");
776 }
777 #endif /* FANCY_STATUS_DUMPS */
778 printk("\n");
779 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
780 err = GET_ERR();
781 printk("%s: %s: error=0x%02x", drive->name, msg, err);
782 #if FANCY_STATUS_DUMPS
783 if (drive->media == disk) {
784 printk(" { ");
785 if (err & BBD_ERR) printk("BadSector ");
786 if (err & ECC_ERR) printk("UncorrectableError ");
787 if (err & ID_ERR) printk("SectorIdNotFound ");
788 if (err & ABRT_ERR) printk("DriveStatusError ");
789 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
790 if (err & MARK_ERR) printk("AddrMarkNotFound ");
791 printk("}");
792 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
793 byte cur = IN_BYTE(IDE_SELECT_REG);
794 if (cur & 0x40) { /* using LBA? */
795 printk(", LBAsect=%ld", (unsigned long)
796 ((cur&0xf)<<24)
797 |(IN_BYTE(IDE_HCYL_REG)<<16)
798 |(IN_BYTE(IDE_LCYL_REG)<<8)
799 | IN_BYTE(IDE_SECTOR_REG));
800 } else {
801 printk(", CHS=%d/%d/%d",
802 (IN_BYTE(IDE_HCYL_REG)<<8) +
803 IN_BYTE(IDE_LCYL_REG),
804 cur & 0xf,
805 IN_BYTE(IDE_SECTOR_REG));
806 }
807 if (HWGROUP(drive)->rq)
808 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
809 }
810 }
811 #endif /* FANCY_STATUS_DUMPS */
812 printk("\n");
813 }
814 restore_flags (flags);
815 return err;
816 }
817
818 /*
819 * try_to_flush_leftover_data() is invoked in response to a drive
820 * unexpectedly having its DRQ_STAT bit set. As an alternative to
821 * resetting the drive, this routine tries to clear the condition
822 * by read a sector's worth of data from the drive. Of course,
823 * this may not help if the drive is *waiting* for data from *us*.
824 */
825 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
826 {
827 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
828
829 while (i > 0) {
830 unsigned long buffer[16];
831 unsigned int wcount = (i > 16) ? 16 : i;
832 i -= wcount;
833 ide_input_data (drive, buffer, wcount);
834 }
835 }
836
837 /*
838 * ide_error() takes action based on the error returned by the controller.
839 *
840 * Returns 1 if an ide reset operation has been initiated, in which case
841 * the caller MUST simply return from the driver (through however many levels).
842 * Returns 0 otherwise.
843 */
844 int ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
845 {
846 struct request *rq;
847 byte err;
848
849 err = ide_dump_status(drive, msg, stat);
850 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
851 return 0;
852 if (rq->cmd == IDE_DRIVE_CMD) { /* never retry an explicit DRIVE_CMD */
853 end_drive_cmd(drive, stat, err);
854 return 0;
855 }
856 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
857 rq->errors |= ERROR_RESET;
858 } else {
859 if (drive->media == disk && (stat & ERR_STAT)) {
860 /* err has different meaning on cdrom */
861 if (err & BBD_ERR) /* retries won't help this! */
862 rq->errors = ERROR_MAX;
863 else if (err & TRK0_ERR) /* help it find track zero */
864 rq->errors |= ERROR_RECAL;
865 }
866 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
867 try_to_flush_leftover_data(drive);
868 }
869 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
870 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
871
872 #ifdef CONFIG_BLK_DEV_TRITON
873 if (rq->errors > 3 && drive->using_dma) { /* DMA troubles? */
874 drive->using_dma = 0;
875 printk("%s: DMA disabled\n", drive->name);
876 --rq->errors;
877 return 0;
878 }
879 #endif /* CONFIG_BLK_DEV_TRITON */
880 if (rq->errors >= ERROR_MAX)
881 ide_end_request(0, HWGROUP(drive));
882 else {
883 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
884 ++rq->errors;
885 return ide_do_reset(drive);
886 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
887 drive->special.b.recalibrate = 1;
888 ++rq->errors;
889 }
890 return 0;
891 }
892
893 /*
894 * read_intr() is the handler for disk read/multread interrupts
895 */
896 static void read_intr (ide_drive_t *drive)
/* */
897 {
898 byte stat;
899 int i;
900 unsigned int msect, nsect;
901 struct request *rq;
902
903 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
904 sti();
905 if (!ide_error(drive, "read_intr", stat))
906 IDE_DO_REQUEST;
907 return;
908 }
909 msect = drive->mult_count;
910 read_next:
911 rq = HWGROUP(drive)->rq;
912 if (msect) {
913 if ((nsect = rq->current_nr_sectors) > msect)
914 nsect = msect;
915 msect -= nsect;
916 } else
917 nsect = 1;
918 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
919 #ifdef DEBUG
920 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
921 drive->name, rq->sector, rq->sector+nsect-1,
922 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
923 #endif
924 rq->sector += nsect;
925 rq->buffer += nsect<<9;
926 rq->errors = 0;
927 i = (rq->nr_sectors -= nsect);
928 if ((rq->current_nr_sectors -= nsect) <= 0)
929 ide_end_request(1, HWGROUP(drive));
930 if (i > 0) {
931 if (msect)
932 goto read_next;
933 ide_set_handler (drive, &read_intr);
934 return;
935 }
936 IDE_DO_REQUEST;
937 }
938
939 /*
940 * write_intr() is the handler for disk write interrupts
941 */
942 static void write_intr (ide_drive_t *drive)
/* */
943 {
944 byte stat;
945 int i;
946 struct request *rq = HWGROUP(drive)->rq;
947
948 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
949 #ifdef DEBUG
950 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
951 drive->name, rq->sector, (unsigned long) rq->buffer,
952 rq->nr_sectors-1);
953 #endif
954 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
955 rq->sector++;
956 rq->buffer += 512;
957 rq->errors = 0;
958 i = --rq->nr_sectors;
959 --rq->current_nr_sectors;
960 if (rq->current_nr_sectors <= 0)
961 ide_end_request(1, HWGROUP(drive));
962 if (i > 0) {
963 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
964 ide_set_handler (drive, &write_intr);
965 return;
966 }
967 IDE_DO_REQUEST;
968 return;
969 }
970 }
971 sti();
972 if (!ide_error(drive, "write_intr", stat))
973 IDE_DO_REQUEST;
974 }
975
976 /*
977 * multwrite() transfers a block of one or more sectors of data to a drive
978 * as part of a disk multwrite operation.
979 */
980 static void multwrite (ide_drive_t *drive)
/* */
981 {
982 struct request *rq = &HWGROUP(drive)->wrq;
983 unsigned int mcount = drive->mult_count;
984
985 do {
986 unsigned int nsect = rq->current_nr_sectors;
987 if (nsect > mcount)
988 nsect = mcount;
989 mcount -= nsect;
990
991 ide_output_data(drive, rq->buffer, nsect<<7);
992 #ifdef DEBUG
993 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
994 drive->name, rq->sector, (unsigned long) rq->buffer,
995 nsect, rq->nr_sectors - nsect);
996 #endif
997 if ((rq->nr_sectors -= nsect) <= 0)
998 break;
999 if ((rq->current_nr_sectors -= nsect) == 0) {
1000 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1001 rq->current_nr_sectors = rq->bh->b_size>>9;
1002 rq->buffer = rq->bh->b_data;
1003 } else {
1004 panic("%s: buffer list corrupted\n", drive->name);
1005 break;
1006 }
1007 } else {
1008 rq->buffer += nsect << 9;
1009 }
1010 } while (mcount);
1011 }
1012
1013 /*
1014 * write_intr() is the handler for disk multwrite interrupts
1015 */
1016 static void multwrite_intr (ide_drive_t *drive)
/* */
1017 {
1018 byte stat;
1019 int i;
1020 struct request *rq = &HWGROUP(drive)->wrq;
1021
1022 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1023 if (stat & DRQ_STAT) {
1024 if (rq->nr_sectors) {
1025 multwrite(drive);
1026 ide_set_handler (drive, &multwrite_intr);
1027 return;
1028 }
1029 } else {
1030 if (!rq->nr_sectors) { /* all done? */
1031 rq = HWGROUP(drive)->rq;
1032 for (i = rq->nr_sectors; i > 0;){
1033 i -= rq->current_nr_sectors;
1034 ide_end_request(1, HWGROUP(drive));
1035 }
1036 IDE_DO_REQUEST;
1037 return;
1038 }
1039 }
1040 }
1041 sti();
1042 if (!ide_error(drive, "multwrite_intr", stat))
1043 IDE_DO_REQUEST;
1044 }
1045
1046 /*
1047 * Issue a simple drive command
1048 * The drive must be selected beforehand.
1049 */
1050 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1051 {
1052 ide_set_handler (drive, handler);
1053 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1054 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1055 OUT_BYTE(cmd,IDE_COMMAND_REG);
1056 }
1057
1058 /*
1059 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1060 */
1061 static void set_multmode_intr (ide_drive_t *drive)
/* */
1062 {
1063 byte stat = GET_STAT();
1064
1065 sti();
1066 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1067 drive->mult_count = drive->mult_req;
1068 } else {
1069 drive->mult_req = drive->mult_count = 0;
1070 drive->special.b.recalibrate = 1;
1071 (void) ide_dump_status(drive, "set_multmode", stat);
1072 }
1073 IDE_DO_REQUEST;
1074 }
1075
1076 /*
1077 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1078 */
1079 static void set_geometry_intr (ide_drive_t *drive)
/* */
1080 {
1081 byte stat = GET_STAT();
1082
1083 sti();
1084 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1085 if (ide_error(drive, "set_geometry_intr", stat))
1086 return;
1087 IDE_DO_REQUEST;
1088 }
1089
1090 /*
1091 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1092 */
1093 static void recal_intr (ide_drive_t *drive)
/* */
1094 {
1095 byte stat = GET_STAT();
1096
1097 sti();
1098 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1099 if (ide_error(drive, "recal_intr", stat))
1100 return;
1101 IDE_DO_REQUEST;
1102 }
1103
1104 /*
1105 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1106 */
1107 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1108 {
1109 byte stat = GET_STAT();
1110
1111 sti();
1112 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1113 end_drive_cmd (drive, stat, GET_ERR());
1114 else if (ide_error(drive, "drive_cmd", stat)) /* calls end_drive_cmd */
1115 return;
1116 IDE_DO_REQUEST;
1117 }
1118
1119 /*
1120 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1121 * commands to a drive. It used to do much more, but has been scaled back
1122 * in recent updates, and could be completely eliminated with a bit more effort.
1123 */
1124 static inline void do_special (ide_drive_t *drive)
/* */
1125 {
1126 special_t *s = &drive->special;
1127 #ifdef DEBUG
1128 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1129 #endif
1130 if (s->b.set_geometry) {
1131 s->b.set_geometry = 0;
1132 if (drive->media == disk) {
1133 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1134 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1135 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1136 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1137 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1138 }
1139 } else if (s->b.recalibrate) {
1140 s->b.recalibrate = 0;
1141 if (drive->media == disk) {
1142 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1143 }
1144 } else if (s->b.set_multmode) {
1145 s->b.set_multmode = 0;
1146 if (drive->media == disk) {
1147 if (drive->id && drive->mult_req > drive->id->max_multsect)
1148 drive->mult_req = drive->id->max_multsect;
1149 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1150 } else
1151 drive->mult_req = 0;
1152 } else if (s->all) {
1153 s->all = 0;
1154 printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1155 }
1156 }
1157
1158 /*
1159 * This routine busy-waits for the drive status to be not "busy".
1160 * It then checks the status for all of the "good" bits and none
1161 * of the "bad" bits, and if all is okay it returns 0. All other
1162 * cases return 1 after invoking ide_error()
1163 *
1164 * This routine should get fixed to not hog the cpu during extra long waits..
1165 * That could be done by busy-waiting for the first jiffy or two, and then
1166 * setting a timer to wake up at half second intervals thereafter,
1167 * until WAIT_WORSTCASE is achieved, before timing out.
1168 */
1169 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1170 {
1171 byte stat;
1172 unsigned long flags;
1173 test:
1174 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1175 if (OK_STAT((stat = GET_STAT()), good, bad))
1176 return 0; /* fast exit for most frequent case */
1177 if (!(stat & BUSY_STAT)) {
1178 (void) ide_error(drive, "status error", stat);
1179 return 1;
1180 }
1181
1182 save_flags(flags);
1183 sti();
1184 timeout += jiffies;
1185 do {
1186 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1187 restore_flags(flags);
1188 goto test;
1189 }
1190 } while (jiffies <= timeout);
1191
1192 restore_flags(flags);
1193 (void) ide_error(drive, "status timeout", GET_STAT());
1194 return 1;
1195 }
1196
1197 /*
1198 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1199 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1200 * care of issuing special DRIVE_CMDs.
1201 */
1202 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1203 {
1204 unsigned short io_base = HWIF(drive)->io_base;
1205
1206 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1207 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1208 if (drive->select.b.lba) {
1209 #ifdef DEBUG
1210 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1211 drive->name, (rq->cmd==READ)?"read":"writ",
1212 block, rq->nr_sectors, (unsigned long) rq->buffer);
1213 #endif
1214 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1215 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1216 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1217 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1218 } else {
1219 unsigned int sect,head,cyl,track;
1220 track = block / drive->sect;
1221 sect = block % drive->sect + 1;
1222 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1223 head = track % drive->head;
1224 cyl = track / drive->head;
1225 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1226 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1227 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1228 #ifdef DEBUG
1229 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1230 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1231 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1232 #endif
1233 }
1234 if (rq->cmd == READ) {
1235 #ifdef CONFIG_BLK_DEV_TRITON
1236 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1237 return;
1238 #endif /* CONFIG_BLK_DEV_TRITON */
1239 ide_set_handler(drive, &read_intr);
1240 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1241 return;
1242 }
1243 if (rq->cmd == WRITE) {
1244 #ifdef CONFIG_BLK_DEV_TRITON
1245 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1246 return;
1247 #endif /* CONFIG_BLK_DEV_TRITON */
1248 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1249 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1250 printk("%s: no DRQ after issuing %s\n", drive->name,
1251 drive->mult_count ? "MULTWRITE" : "WRITE");
1252 return;
1253 }
1254 if (!drive->unmask)
1255 cli();
1256 if (drive->mult_count) {
1257 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1258 ide_set_handler (drive, &multwrite_intr);
1259 multwrite(drive);
1260 } else {
1261 ide_set_handler (drive, &write_intr);
1262 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1263 }
1264 return;
1265 }
1266 if (rq->cmd == IDE_DRIVE_CMD) {
1267 byte *args = rq->buffer;
1268 if (args) {
1269 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1270 drive->name, args[0], args[1], args[2]);
1271 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1272 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1273 return;
1274 } else {
1275 /*
1276 * NULL is actually a valid way of waiting for
1277 * all current requests to be flushed from the queue.
1278 */
1279 #ifdef DEBUG
1280 printk("%s: DRIVE_CMD (null)\n", drive->name);
1281 #endif
1282 end_drive_cmd(drive, GET_STAT(), GET_ERR());
1283 return;
1284 }
1285 }
1286 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1287 ide_end_request(0, HWGROUP(drive));
1288 }
1289
1290 /*
1291 * do_request() initiates handling of a new I/O request
1292 */
1293 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1294 {
1295 unsigned int minor, unit;
1296 unsigned long block, blockend;
1297 ide_drive_t *drive;
1298
1299 sti();
1300 #ifdef DEBUG
1301 printk("%s: ide_do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1302 #endif
1303 minor = MINOR(rq->rq_dev);
1304 unit = minor >> PARTN_BITS;
1305 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1306 printk("%s: bad device number: %s\n",
1307 hwif->name, kdevname(rq->rq_dev));
1308 goto kill_rq;
1309 }
1310 drive = &hwif->drives[unit];
1311 #ifdef DEBUG
1312 if (rq->bh && !rq->bh->b_lock) {
1313 printk("%s: block not locked\n", drive->name);
1314 goto kill_rq;
1315 }
1316 #endif
1317 block = rq->sector;
1318 blockend = block + rq->nr_sectors;
1319 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1320 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1321 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1322 goto kill_rq;
1323 }
1324 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1325 #if FAKE_FDISK_FOR_EZDRIVE
1326 if (block == 0 && drive->ezdrive) {
1327 block = 1;
1328 printk("%s: [EZD] accessing sector 1 instead of sector 0\n", drive->name);
1329 }
1330 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1331 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1332 #if (DISK_RECOVERY_TIME > 0)
1333 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1334 #endif
1335 #if SUPPORT_HT6560B
1336 if (hwif->select)
1337 ide_hwif_select (hwif);
1338 #endif
1339 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1340 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1341 printk("%s: drive not ready for command\n", drive->name);
1342 return;
1343
1344 }
1345 if (!drive->special.all) {
1346 #ifdef CONFIG_BLK_DEV_IDECD
1347 switch (drive->media) {
1348 case disk:
1349 do_rw_disk (drive, rq, block);
1350 return;
1351 case cdrom:
1352 ide_do_rw_cdrom (drive, block);
1353 return;
1354 default:
1355 printk("%s: media type %d not supported\n",
1356 drive->name, drive->media);
1357 goto kill_rq;
1358 }
1359 #else
1360 do_rw_disk (drive, rq, block); /* simpler and faster */
1361 return;
1362 #endif;
1363 }
1364 do_special(drive);
1365 return;
1366 kill_rq:
1367 ide_end_request(0, hwif->hwgroup);
1368 }
1369
1370 /*
1371 * The driver enables interrupts as much as possible. In order to do this,
1372 * (a) the device-interrupt is always masked before entry, and
1373 * (b) the timeout-interrupt is always disabled before entry.
1374 *
1375 * If we enter here from, say irq14, and then start a new request for irq15,
1376 * (possible with "serialize" option) then we cannot ensure that we exit
1377 * before the irq15 hits us. So, we must be careful not to let this bother us.
1378 *
1379 * Interrupts are still masked (by default) whenever we are exchanging
1380 * data/cmds with a drive, because some drives seem to have very poor
1381 * tolerance for latency during I/O. For devices which don't suffer from
1382 * this problem (most don't), the unmask flag can be set using the "hdparm"
1383 * utility, to permit other interrupts during data/cmd transfers.
1384 */
1385 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1386 {
1387 cli(); /* paranoia */
1388 if (hwgroup->handler != NULL) {
1389 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1390 return;
1391 }
1392 do {
1393 ide_hwif_t *hwif = hwgroup->hwif;
1394 struct request *rq;
1395 if ((rq = hwgroup->rq) == NULL) {
1396 hwgroup->drive = NULL; /* paranoia */
1397 do {
1398 rq = blk_dev[hwif->major].current_request;
1399 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1400 goto got_rq;
1401 } while ((hwif = hwif->next) != hwgroup->hwif);
1402 return; /* no work left for this hwgroup */
1403 got_rq:
1404 blk_dev[hwif->major].current_request = rq->next;
1405 }
1406 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1407 cli();
1408 } while (hwgroup->handler == NULL);
1409 }
1410
1411 /*
1412 * do_hwgroup_request() invokes ide_do_request() after first masking
1413 * all possible interrupts for the current hwgroup. This prevents race
1414 * conditions in the event that an unexpected interrupt occurs while
1415 * we are in the driver.
1416 *
1417 * Note that when an interrupt is used to reenter the driver, the first level
1418 * handler will already have masked the irq that triggered, but any other ones
1419 * for the hwgroup will still be unmasked. The driver tries to be careful
1420 * about such things.
1421 */
1422 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1423 {
1424 if (hwgroup->handler == NULL) {
1425 ide_hwif_t *hgif = hwgroup->hwif;
1426 ide_hwif_t *hwif = hgif;
1427 do {
1428 disable_irq(hwif->irq);
1429 } while ((hwif = hwif->next) != hgif);
1430 ide_do_request (hwgroup);
1431 do {
1432 enable_irq(hwif->irq);
1433 } while ((hwif = hwif->next) != hgif);
1434 }
1435 }
1436
1437 static void do_ide0_request (void) /* invoked with cli() */
/* */
1438 {
1439 do_hwgroup_request (ide_hwifs[0].hwgroup);
1440 }
1441
1442 static void do_ide1_request (void) /* invoked with cli() */
/* */
1443 {
1444 do_hwgroup_request (ide_hwifs[1].hwgroup);
1445 }
1446
1447 static void do_ide2_request (void) /* invoked with cli() */
/* */
1448 {
1449 do_hwgroup_request (ide_hwifs[2].hwgroup);
1450 }
1451
1452 static void do_ide3_request (void) /* invoked with cli() */
/* */
1453 {
1454 do_hwgroup_request (ide_hwifs[3].hwgroup);
1455 }
1456
1457 static void timer_expiry (unsigned long data)
/* */
1458 {
1459 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1460 ide_drive_t *drive = hwgroup->drive;
1461 unsigned long flags;
1462
1463 save_flags(flags);
1464 cli();
1465
1466 if (hwgroup->reset_timeout != 0) { /* ide reset in progress? */
1467 if (!reset_handler(hwgroup))
1468 do_hwgroup_request (hwgroup);
1469 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1470 sti(); /* drive must have responded just as the timer expired */
1471 printk("%s: marginal timeout\n", drive->name);
1472 } else { /* drive not responding */
1473 hwgroup->handler = NULL;
1474 if (hwgroup->hwif->dmaproc)
1475 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1476 if (!ide_error(drive, "irq timeout", GET_STAT()))
1477 do_hwgroup_request (hwgroup);
1478 }
1479 restore_flags(flags);
1480 }
1481
1482 /*
1483 * There's nothing really useful we can do with an unexpected interrupt,
1484 * other than reading the status register (to clear it), and logging it.
1485 * There should be no way that an irq can happen before we're ready for it,
1486 * so we needn't worry much about losing an "important" interrupt here.
1487 *
1488 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1489 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1490 * "good", we just ignore the interrupt completely.
1491 *
1492 * This routine assumes cli() is in effect when called.
1493 *
1494 * If an unexpected interrupt happens on irq15 while we are handling irq14
1495 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1496 * we could screw up by interfering with a new request being set up for irq15.
1497 *
1498 * In reality, this is a non-issue. The new command is not sent unless the
1499 * drive is ready to accept one, in which case we know the drive is not
1500 * trying to interrupt us. And ide_set_handler() is always invoked before
1501 * completing the issuance of any new drive command, so we will not be
1502 * accidently invoked as a result of any valid command completion interrupt.
1503 *
1504 */
1505 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1506 {
1507 byte stat;
1508 unsigned int unit;
1509 ide_hwif_t *hwif = hwgroup->hwif;
1510
1511 /*
1512 * check for ide reset in progress
1513 */
1514 if (hwgroup->reset_timeout != 0) {
1515 if (!reset_handler(hwgroup))
1516 do_hwgroup_request (hwgroup);
1517 return;
1518 }
1519
1520 /*
1521 * handle the unexpected interrupt
1522 */
1523 do {
1524 if (hwif->irq == irq) {
1525 #if SUPPORT_HT6560B
1526 if (hwif->select)
1527 ide_hwif_select (hwif);
1528 #endif
1529 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1530 ide_drive_t *drive = &hwif->drives[unit];
1531 if (!drive->present)
1532 continue;
1533 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1534 (void) ide_dump_status(drive, "unexpected_intr", stat);
1535 if ((stat & DRQ_STAT))
1536 try_to_flush_leftover_data(drive);
1537 }
1538 }
1539 } while ((hwif = hwif->next) != hwgroup->hwif);
1540 }
1541
1542 /*
1543 * entry point for all interrupts, caller does cli() for us
1544 */
1545 static void ide_intr (int irq, struct pt_regs *regs)
/* */
1546 {
1547 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1548 ide_handler_t *handler;
1549
1550 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1551 ide_drive_t *drive = hwgroup->drive;
1552 hwgroup->handler = NULL;
1553 del_timer(&(hwgroup->timer));
1554 if (drive->unmask)
1555 sti();
1556 handler(drive);
1557 } else {
1558 unexpected_intr(irq, hwgroup);
1559 }
1560 cli();
1561 }
1562
1563 /*
1564 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1565 * It returns NULL if the given device number does not match any present drives.
1566 */
1567 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1568 {
1569 int major = MAJOR(i_rdev);
1570 unsigned int h;
1571
1572 for (h = 0; h < MAX_HWIFS; ++h) {
1573 ide_hwif_t *hwif = &ide_hwifs[h];
1574 if (hwif->present && major == hwif->major) {
1575 unsigned unit = DEVICE_NR(i_rdev);
1576 if (unit < MAX_DRIVES) {
1577 ide_drive_t *drive = &hwif->drives[unit];
1578 if (drive->present)
1579 return drive;
1580 } else if (major == IDE0_MAJOR && unit < 4) {
1581 printk("ide: probable bad entry for /dev/hd%c%d\n",
1582 'a' + unit, MINOR(i_rdev) & PARTN_MASK);
1583 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1584 }
1585 break;
1586 }
1587 }
1588 return NULL;
1589 }
1590
1591 /*
1592 * This function issues a specific IDE drive command onto the
1593 * tail of the request queue, and waits for it to be completed.
1594 * If arg is NULL, it goes through all the motions,
1595 * but without actually sending a command to the drive.
1596 */
1597 int ide_do_drive_cmd(kdev_t rdev, char *args)
/* */
1598 {
1599 unsigned long flags;
1600 unsigned int major = MAJOR(rdev);
1601 struct request rq, *cur_rq;
1602 struct blk_dev_struct *bdev;
1603 struct semaphore sem = MUTEX_LOCKED;
1604
1605 /* build up a special request, and add it to the queue */
1606 rq.buffer = args;
1607 rq.cmd = IDE_DRIVE_CMD;
1608 rq.errors = 0;
1609 rq.sector = 0;
1610 rq.nr_sectors = 0;
1611 rq.current_nr_sectors = 0;
1612 rq.sem = &sem;
1613 rq.bh = NULL;
1614 rq.bhtail = NULL;
1615 rq.next = NULL;
1616 rq.rq_status = RQ_ACTIVE;
1617 rq.rq_dev = rdev;
1618 bdev = &blk_dev[major];
1619
1620 save_flags(flags);
1621 cli();
1622 cur_rq = bdev->current_request;
1623 if (cur_rq == NULL) { /* empty request list? */
1624 bdev->current_request = &rq; /* service ours immediately */
1625 bdev->request_fn();
1626 } else {
1627 while (cur_rq->next != NULL) /* find end of request list */
1628 cur_rq = cur_rq->next;
1629 cur_rq->next = &rq; /* add rq to the end */
1630 }
1631
1632 down(&sem); /* wait for it to be serviced */
1633 restore_flags(flags);
1634 return rq.errors ? -EIO : 0; /* return -EIO if errors */
1635 }
1636
1637 static int ide_open(struct inode * inode, struct file * filp)
/* */
1638 {
1639 ide_drive_t *drive;
1640 unsigned long flags;
1641
1642 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1643 return -ENODEV;
1644 save_flags(flags);
1645 cli();
1646 while (drive->busy)
1647 sleep_on(&drive->wqueue);
1648 drive->usage++;
1649 restore_flags(flags);
1650 #ifdef CONFIG_BLK_DEV_IDECD
1651 if (drive->media == cdrom)
1652 return ide_cdrom_open (inode, filp, drive);
1653 #endif /* CONFIG_BLK_DEV_IDECD */
1654 if (drive->removeable) {
1655 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1656 check_disk_change(inode->i_rdev);
1657 ide_do_drive_cmd(inode->i_rdev, door_lock);
1658 }
1659 return 0;
1660 }
1661
1662 /*
1663 * Releasing a block device means we sync() it, so that it can safely
1664 * be forgotten about...
1665 */
1666 static void ide_release(struct inode * inode, struct file * file)
/* */
1667 {
1668 ide_drive_t *drive;
1669
1670 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1671 sync_dev(inode->i_rdev);
1672 drive->usage--;
1673 #ifdef CONFIG_BLK_DEV_IDECD
1674 if (drive->media == cdrom)
1675 ide_cdrom_release (inode, file, drive);
1676 else
1677 #endif /* CONFIG_BLK_DEV_IDECD */
1678 if (drive->removeable) {
1679 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1680 invalidate_buffers(inode->i_rdev);
1681 ide_do_drive_cmd(inode->i_rdev, door_unlock);
1682 }
1683 }
1684 }
1685
1686 /*
1687 * This routine is called to flush all partitions and partition tables
1688 * for a changed disk, and then re-read the new partition table.
1689 * If we are revalidating a disk because of a media change, then we
1690 * enter with usage == 0. If we are using an ioctl, we automatically have
1691 * usage == 1 (we need an open channel to use an ioctl :-), so this
1692 * is our limit.
1693 */
1694 static int revalidate_disk(kdev_t i_rdev)
/* */
1695 {
1696 ide_drive_t *drive;
1697 unsigned int p, major, minor;
1698 long flags;
1699
1700 if ((drive = get_info_ptr(i_rdev)) == NULL)
1701 return -ENODEV;
1702
1703 major = MAJOR(i_rdev);
1704 minor = drive->select.b.unit << PARTN_BITS;
1705 save_flags(flags);
1706 cli();
1707 if (drive->busy || (drive->usage > 1)) {
1708 restore_flags(flags);
1709 return -EBUSY;
1710 };
1711 drive->busy = 1;
1712 restore_flags(flags);
1713
1714 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1715 if (drive->part[p].nr_sects > 0) {
1716 kdev_t devp = MKDEV(major, minor+p);
1717 sync_dev (devp);
1718 invalidate_inodes (devp);
1719 invalidate_buffers (devp);
1720 }
1721 drive->part[p].start_sect = 0;
1722 drive->part[p].nr_sects = 0;
1723 };
1724
1725 drive->part[0].nr_sects = current_capacity(drive);
1726 if (drive->media == disk)
1727 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1728
1729 drive->busy = 0;
1730 wake_up(&drive->wqueue);
1731 return 0;
1732 }
1733
1734 static int write_fs_long (unsigned long useraddr, long value)
/* */
1735 {
1736 int err;
1737
1738 if (NULL == (long *)useraddr)
1739 return -EINVAL;
1740 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1741 return err;
1742 put_user((unsigned)value, (long *) useraddr);
1743 return 0;
1744 }
1745
1746 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1747 unsigned int cmd, unsigned long arg)
1748 {
1749 struct hd_geometry *loc = (struct hd_geometry *) arg;
1750 int err;
1751 ide_drive_t *drive;
1752 unsigned long flags;
1753
1754 if (!inode || !(inode->i_rdev))
1755 return -EINVAL;
1756 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1757 return -ENODEV;
1758 switch (cmd) {
1759 case HDIO_GETGEO:
1760 if (!loc || drive->media != disk) return -EINVAL;
1761 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1762 if (err) return err;
1763 put_user(drive->bios_head, (byte *) &loc->heads);
1764 put_user(drive->bios_sect, (byte *) &loc->sectors);
1765 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1766 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1767 (unsigned long *) &loc->start);
1768 return 0;
1769
1770 case BLKFLSBUF:
1771 if(!suser()) return -EACCES;
1772 fsync_dev(inode->i_rdev);
1773 invalidate_buffers(inode->i_rdev);
1774 return 0;
1775
1776 case BLKRASET:
1777 if(!suser()) return -EACCES;
1778 if(arg > 0xff) return -EINVAL;
1779 read_ahead[MAJOR(inode->i_rdev)] = arg;
1780 return 0;
1781
1782 case BLKRAGET:
1783 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1784
1785 case BLKGETSIZE: /* Return device size */
1786 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1787 case BLKRRPART: /* Re-read partition tables */
1788 return revalidate_disk(inode->i_rdev);
1789
1790 case HDIO_GET_KEEPSETTINGS:
1791 return write_fs_long(arg, drive->keep_settings);
1792
1793 case HDIO_GET_UNMASKINTR:
1794 return write_fs_long(arg, drive->unmask);
1795
1796 case HDIO_GET_DMA:
1797 return write_fs_long(arg, drive->using_dma);
1798
1799 case HDIO_GET_CHIPSET:
1800 return write_fs_long(arg, drive->chipset);
1801
1802 case HDIO_GET_MULTCOUNT:
1803 return write_fs_long(arg, drive->mult_count);
1804
1805 case HDIO_GET_IDENTITY:
1806 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1807 return -EINVAL;
1808 if (drive->id == NULL)
1809 return -ENOMSG;
1810 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1811 if (!err)
1812 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1813 return err;
1814
1815 case HDIO_GET_NOWERR:
1816 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1817
1818 case HDIO_SET_DMA:
1819 if (drive->media != disk)
1820 return -EPERM;
1821 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1822 return -EPERM;
1823 case HDIO_SET_KEEPSETTINGS:
1824 case HDIO_SET_UNMASKINTR:
1825 case HDIO_SET_NOWERR:
1826 if (arg > 1)
1827 return -EINVAL;
1828 case HDIO_SET_CHIPSET:
1829 if (!suser())
1830 return -EACCES;
1831 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1832 return -EINVAL;
1833 save_flags(flags);
1834 cli();
1835 switch (cmd) {
1836 case HDIO_SET_DMA:
1837 drive->using_dma = arg;
1838 break;
1839 case HDIO_SET_KEEPSETTINGS:
1840 drive->keep_settings = arg;
1841 break;
1842 case HDIO_SET_UNMASKINTR:
1843 if (arg && disallow_unmask) {
1844 restore_flags(flags);
1845 return -EPERM;
1846 }
1847 drive->unmask = arg;
1848 break;
1849 case HDIO_SET_NOWERR:
1850 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1851 break;
1852 case HDIO_SET_CHIPSET:
1853 drive->chipset = arg;
1854 drive->vlb_32bit = (arg & 1);
1855 drive->vlb_sync = (arg & 2) >> 1;
1856 #ifndef VLB_SYNC
1857 if (drive->vlb_sync)
1858 printk("%s: VLB_SYNC not supported by this kernel\n", drive->name);
1859 #endif
1860 break;
1861 }
1862 restore_flags(flags);
1863 return 0;
1864
1865 case HDIO_SET_MULTCOUNT:
1866 if (!suser())
1867 return -EACCES;
1868 if (MINOR(inode->i_rdev) & PARTN_MASK)
1869 return -EINVAL;
1870 if ((drive->id != NULL) && (arg > drive->id->max_multsect))
1871 return -EINVAL;
1872 save_flags(flags);
1873 cli();
1874 if (drive->special.b.set_multmode) {
1875 restore_flags(flags);
1876 return -EBUSY;
1877 }
1878 drive->mult_req = arg;
1879 drive->special.b.set_multmode = 1;
1880 restore_flags(flags);
1881 ide_do_drive_cmd (inode->i_rdev, NULL);
1882 return (drive->mult_count == arg) ? 0 : -EIO;
1883
1884 case HDIO_DRIVE_CMD:
1885 {
1886 unsigned long args;
1887
1888 if (NULL == (long *) arg)
1889 err = ide_do_drive_cmd(inode->i_rdev,NULL);
1890 else {
1891 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1892 {
1893 args = get_user((long *)arg);
1894 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1895 err = ide_do_drive_cmd(inode->i_rdev,(char *)&args);
1896 put_user(args,(long *)arg);
1897 }
1898 }
1899 }
1900 return err;
1901 }
1902
1903 RO_IOCTLS(inode->i_rdev, arg);
1904
1905 default:
1906 #ifdef CONFIG_BLK_DEV_IDECD
1907 if (drive->media == cdrom)
1908 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
1909 #endif /* CONFIG_BLK_DEV_IDECD */
1910 return -EPERM;
1911 }
1912 }
1913
1914 static int ide_check_media_change (kdev_t i_rdev)
/* */
1915 {
1916 ide_drive_t *drive;
1917
1918 if ((drive = get_info_ptr(i_rdev)) == NULL)
1919 return -ENODEV;
1920 #ifdef CONFIG_BLK_DEV_IDECD
1921 if (drive->media == cdrom)
1922 return ide_cdrom_check_media_change (drive);
1923 #endif /* CONFIG_BLK_DEV_IDECD */
1924 if (drive->removeable) /* for disks */
1925 return 1; /* always assume it was changed */
1926 return 0;
1927 }
1928
1929 static void fixstring (byte *s, const int bytecount, const int byteswap)
/* */
1930 {
1931 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
1932
1933 if (byteswap) {
1934 /* convert from big-endian to host byte order */
1935 for (p = end ; p != s;) {
1936 unsigned short *pp = (unsigned short *) (p -= 2);
1937 *pp = ntohs(*pp);
1938 }
1939 }
1940
1941 /* strip leading blanks */
1942 while (s != end && *s == ' ')
1943 ++s;
1944
1945 /* compress internal blanks and strip trailing blanks */
1946 while (s != end && *s) {
1947 if (*s++ != ' ' || (s != end && *s && *s != ' '))
1948 *p++ = *(s-1);
1949 }
1950
1951 /* wipe out trailing garbage */
1952 while (p != end)
1953 *p++ = '\0';
1954 }
1955
1956 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
1957 {
1958 int bswap;
1959 struct hd_driveid *id;
1960 unsigned long capacity, check;
1961
1962 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
1963 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
1964 sti();
1965
1966 /*
1967 * EATA SCSI controllers do a hardware ATA emulation: ignore them
1968 */
1969 if ((id->model[0] == 'P' && id->model[1] == 'M')
1970 || (id->model[0] == 'S' && id->model[1] == 'K')) {
1971 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
1972 drive->present = 0;
1973 return;
1974 }
1975
1976 /*
1977 * WIN_IDENTIFY returns little-endian info,
1978 * WIN_PIDENTIFY *usually* returns little-endian info.
1979 */
1980 bswap = 1;
1981 if (cmd == WIN_PIDENTIFY) {
1982 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
1983 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
1984 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
1985 bswap = 0; /* Vertos drives may still be weird */
1986 }
1987 fixstring (id->model, sizeof(id->model), bswap);
1988 fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
1989 fixstring (id->serial_no, sizeof(id->serial_no), bswap);
1990
1991 /*
1992 * Check for an ATAPI device
1993 */
1994 if (cmd == WIN_PIDENTIFY) {
1995 #ifdef CONFIG_BLK_DEV_IDECD
1996 byte type = (id->config >> 8) & 0x0f;
1997 #endif /* CONFIG_BLK_DEV_IDECD */
1998 printk("%s: %s, ATAPI, ", drive->name, id->model);
1999 drive->media = cdrom;
2000 #ifdef CONFIG_BLK_DEV_IDECD
2001 if (type == 0 || type == 5)
2002 printk("CDROM drive\n");
2003 else
2004 printk("UNKNOWN device\n");
2005 drive->present = 1;
2006 drive->removeable = 1;
2007 #else
2008 printk("not supported by this kernel\n");
2009 #endif /* CONFIG_BLK_DEV_IDECD */
2010 return;
2011 }
2012
2013 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2014 if (id->config & (1<<7)) { /* removeable disk ? */
2015 if (id->model[0] != 'W' || id->model[1] != 'D')
2016 drive->removeable = 1;
2017 }
2018
2019 drive->media = disk;
2020 /* Extract geometry if we did not already have one for the drive */
2021 if (!drive->present) {
2022 drive->present = 1;
2023 drive->cyl = drive->bios_cyl = id->cyls;
2024 drive->head = drive->bios_head = id->heads;
2025 drive->sect = drive->bios_sect = id->sectors;
2026 }
2027 /* Handle logical geometry translation by the drive */
2028 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2029 && (id->cur_heads <= 16) && id->cur_sectors)
2030 {
2031 /*
2032 * Extract the physical drive geometry for our use.
2033 * Note that we purposely do *not* update the bios info.
2034 * This way, programs that use it (like fdisk) will
2035 * still have the same logical view as the BIOS does,
2036 * which keeps the partition table from being screwed.
2037 *
2038 * An exception to this is the cylinder count,
2039 * which we reexamine later on to correct for 1024 limitations.
2040 */
2041 drive->cyl = id->cur_cyls;
2042 drive->head = id->cur_heads;
2043 drive->sect = id->cur_sectors;
2044
2045 /* check for word-swapped "capacity" field in id information */
2046 capacity = drive->cyl * drive->head * drive->sect;
2047 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2048 if (check == capacity) { /* was it swapped? */
2049 /* yes, bring it into little-endian order: */
2050 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2051 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2052 }
2053 }
2054 /* Use physical geometry if what we have still makes no sense */
2055 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2056 drive->cyl = id->cyls;
2057 drive->head = id->heads;
2058 drive->sect = id->sectors;
2059 }
2060 /* Correct the number of cyls if the bios value is too small */
2061 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2062 if (drive->cyl > drive->bios_cyl)
2063 drive->bios_cyl = drive->cyl;
2064 }
2065
2066 (void) current_capacity (drive); /* initialize LBA selection */
2067
2068 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2069 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2070 drive->select.b.lba ? "LBA, " : "",
2071 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2072
2073 drive->mult_count = 0;
2074 if (id->max_multsect) {
2075 drive->mult_req = INITIAL_MULT_COUNT;
2076 if (drive->mult_req > id->max_multsect)
2077 drive->mult_req = id->max_multsect;
2078 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2079 drive->special.b.set_multmode = 1;
2080 }
2081 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2082 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2083 printk(", DMA");
2084 }
2085 printk("\n");
2086 }
2087
2088 /*
2089 * Delay for *at least* 10ms. As we don't know how much time is left
2090 * until the next tick occurs, we wait an extra tick to be safe.
2091 */
2092 static void delay_10ms (void)
/* */
2093 {
2094 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2095 while (timer > jiffies);
2096 }
2097
2098 /*
2099 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2100 * and waits for a response. It also monitors irqs while this is
2101 * happening, in hope of automatically determining which one is
2102 * being used by the interface.
2103 *
2104 * Returns: 0 device was identified
2105 * 1 device timed-out (no response to identify request)
2106 * 2 device aborted the command (refused to identify itself)
2107 */
2108 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2109 {
2110 int hd_status, rc;
2111 unsigned long timeout;
2112 int irqs = 0;
2113
2114 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2115 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2116 irqs = probe_irq_on(); /* start monitoring irqs */
2117 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2118 }
2119
2120 delay_10ms(); /* take a deep breath */
2121 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2122 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2123 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2124 } else
2125 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2126
2127 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2128 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2129 timeout += jiffies;
2130 do {
2131 if (jiffies > timeout) {
2132 if (!HWIF(drive)->irq)
2133 (void) probe_irq_off(irqs);
2134 return 1; /* drive timed-out */
2135 }
2136 delay_10ms(); /* give drive a breather */
2137 } while (IN_BYTE(hd_status) & BUSY_STAT);
2138
2139 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2140 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2141 cli(); /* some systems need this */
2142 do_identify(drive, cmd); /* drive returned ID */
2143 rc = 0; /* success */
2144 } else
2145 rc = 2; /* drive refused ID */
2146 if (!HWIF(drive)->irq) {
2147 irqs = probe_irq_off(irqs); /* get irq number */
2148 if (irqs > 0)
2149 HWIF(drive)->irq = irqs;
2150 else /* Mmmm.. multiple IRQs */
2151 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2152 }
2153 return rc;
2154 }
2155
2156 /*
2157 * do_probe() has the difficult job of finding a drive if it exists,
2158 * without getting hung up if it doesn't exist, without trampling on
2159 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2160 *
2161 * If a drive is "known" to exist (from CMOS or kernel parameters),
2162 * but does not respond right away, the probe will "hang in there"
2163 * for the maximum wait time (about 30 seconds), otherwise it will
2164 * exit much more quickly.
2165 *
2166 * Returns: 0 device was identified
2167 * 1 device timed-out (no response to identify request)
2168 * 2 device aborted the command (refused to identify itself)
2169 * 3 bad status from device (possible for ATAPI drives)
2170 * 4 probe was not attempted because failure was obvious
2171 */
2172 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2173 {
2174 int rc;
2175 #ifdef CONFIG_BLK_DEV_IDECD
2176 if (drive->present) { /* avoid waiting for inappropriate probes */
2177 if ((drive->media == cdrom) && (cmd == WIN_IDENTIFY))
2178 return 4;
2179 }
2180 #endif /* CONFIG_BLK_DEV_IDECD */
2181 #ifdef DEBUG
2182 printk("probing for %s: present=%d, type=%s, probetype=%s\n",
2183 drive->name, drive->present, drive->media ? "cdrom":"disk",
2184 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2185 #endif
2186 #if SUPPORT_HT6560B
2187 if (HWIF(drive)->select)
2188 ide_hwif_select (HWIF(drive));
2189 #endif
2190 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2191 delay_10ms(); /* wait for BUSY_STAT */
2192 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2193 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2194 return 3; /* no i/f present: avoid killing ethernet cards */
2195 }
2196
2197 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2198 || drive->present || cmd == WIN_PIDENTIFY)
2199 {
2200 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2201 rc = try_to_identify(drive,cmd); /* failed: try again */
2202 if (rc == 1)
2203 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2204 (void) GET_STAT(); /* ensure drive irq is clear */
2205 } else {
2206 rc = 3; /* not present or maybe ATAPI */
2207 }
2208 if (drive->select.b.unit != 0) {
2209 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2210 delay_10ms();
2211 (void) GET_STAT(); /* ensure drive irq is clear */
2212 }
2213 return rc;
2214 }
2215
2216 /*
2217 * probe_for_drive() tests for existance of a given drive using do_probe().
2218 *
2219 * Returns: 0 no device was found
2220 * 1 device was found (note: drive->present might still be 0)
2221 */
2222 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2223 {
2224 if (drive->noprobe) /* skip probing? */
2225 return drive->present;
2226 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2227 #ifdef CONFIG_BLK_DEV_IDECD
2228 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2229 #endif /* CONFIG_BLK_DEV_IDECD */
2230 }
2231 if (!drive->present)
2232 return 0; /* drive not found */
2233 if (drive->id == NULL) { /* identification failed? */
2234 if (drive->media == disk) {
2235 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2236 drive->name, drive->cyl, drive->head, drive->sect);
2237 }
2238 #ifdef CONFIG_BLK_DEV_IDECD
2239 else if (drive->media == cdrom) {
2240 printk("%s: ATAPI cdrom (?)\n", drive->name);
2241 }
2242 #endif /* CONFIG_BLK_DEV_IDECD */
2243 else {
2244 drive->present = 0; /* nuke it */
2245 return 1; /* drive was found */
2246 }
2247 }
2248 if (drive->media == disk && !drive->select.b.lba) {
2249 if (!drive->head || drive->head > 16) {
2250 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2251 drive->name, drive->head);
2252 drive->present = 0;
2253 }
2254 }
2255 return 1; /* drive was found */
2256 }
2257
2258 /*
2259 * This routine only knows how to look for drive units 0 and 1
2260 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2261 */
2262 static void probe_for_drives (ide_hwif_t *hwif)
/* */
2263 {
2264 unsigned int unit;
2265
2266 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2267 int msgout = 0;
2268 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2269 ide_drive_t *drive = &hwif->drives[unit];
2270 if (drive->present) {
2271 drive->present = 0;
2272 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2273 msgout = 1;
2274 }
2275 }
2276 if (!msgout)
2277 printk("%s: ports already in use, skipping probe\n", hwif->name);
2278 } else {
2279 unsigned long flags;
2280 save_flags(flags);
2281
2282 #if (MAX_DRIVES > 2)
2283 printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2284 #endif
2285 sti(); /* needed for jiffies and irq probing */
2286 /*
2287 * Second drive should only exist if first drive was found,
2288 * but a lot of cdrom drives seem to be configured as slave-only
2289 */
2290 for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2291 ide_drive_t *drive = &hwif->drives[unit];
2292 (void) probe_for_drive (drive);
2293 }
2294 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2295 ide_drive_t *drive = &hwif->drives[unit];
2296 if (drive->present) {
2297 hwif->present = 1;
2298 request_region(hwif->io_base, 8, hwif->name);
2299 request_region(hwif->ctl_port, 1, hwif->name);
2300 break;
2301 }
2302 }
2303 restore_flags(flags);
2304 }
2305 }
2306
2307 #if SUPPORT_DTC2278
2308 /*
2309 * From: andy@cercle.cts.com (Dyan Wile)
2310 *
2311 * Below is a patch for DTC-2278 - alike software-programmable controllers
2312 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
2313 * the primary (EIDE). You may probably have to enable the 32-bit support to
2314 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
2315 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
2316 * filesystem corrupted with -u1, but under heavy disk load only :-)
2317 *
2318 * From: mlord@bnr.ca -- this chipset is now forced to use the "serialize" feature,
2319 * which hopefully will make it more reliable to use.. maybe it has the same bugs
2320 * as the CMD640B and RZ1000 ??
2321 */
2322
2323 #if SET_DTC2278_MODE4
2324 static void sub22 (char b, char c)
/* */
2325 {
2326 int i;
2327
2328 for(i = 0; i < 3; ++i) {
2329 inb(0x3f6);
2330 outb_p(b,0xb0);
2331 inb(0x3f6);
2332 outb_p(c,0xb4);
2333 inb(0x3f6);
2334 if(inb(0xb4) == c) {
2335 outb_p(7,0xb0);
2336 inb(0x3f6);
2337 return; /* success */
2338 }
2339 }
2340 }
2341 #endif /* SET_DTC2278_MODE4 */
2342
2343 static void init_dtc2278 (void)
/* */
2344 {
2345 cli();
2346 #if SET_DTC2278_MODE4
2347 /*
2348 * This enables PIO mode4 (3?) on the first interface
2349 */
2350 sub22(1,0xc3);
2351 sub22(0,0xa0);
2352 #endif /* SET_DTC2278_MODE4 */
2353 /*
2354 * This enables the second interface
2355 */
2356 outb_p(4,0xb0);
2357 inb(0x3f6);
2358 outb_p(0x20,0xb4);
2359 inb(0x3f6);
2360
2361 sti();
2362 }
2363 #endif /* SUPPORT_DTC2278 */
2364
2365 #if SUPPORT_CMD640
2366 /*
2367 * ??? fixme:
2368 */
2369 byte read_cmd640_vlb (byte port, byte reg)
/* */
2370 {
2371 byte val;
2372
2373 unsigned long flags;
2374 save_flags(flags);
2375 cli();
2376 outw(reg, port);
2377 val = inb(port+4);
2378 restore_flags(flags);
2379 return val;
2380 }
2381
2382 void write_cmd640_vlb (byte port, byte reg, byte val)
/* */
2383 {
2384 unsigned long flags;
2385 save_flags(flags);
2386 cli();
2387 outw(reg, port);
2388 outw(val, port+4);
2389 restore_flags(flags);
2390 }
2391
2392 void init_cmd640_vlb (void)
/* */
2393 {
2394 byte reg;
2395 unsigned short port = 0x178;
2396
2397 single_threaded = 1;
2398 printk("ide: buggy CMD640 interface: serialized, ");
2399 reg = read_cmd640_vlb(port, 0x50);
2400 if (reg == 0xff || (reg & 0x90) != 0x90) {
2401 #if TRY_CMD640_VLB_AT_0x78
2402 port = 0x78;
2403 if (reg == 0xff || (reg & 0x90) != 0x90)
2404 #endif
2405 {
2406 disallow_unmask = 1;
2407 printk("(probe failed) disabled unmasking\n");
2408 return;
2409 }
2410 }
2411 write_cmd640_vlb(port, 0x51, read_cmd640_vlb(port, 0x51)|0xc8);
2412 write_cmd640_vlb(port, 0x57, read_cmd640_vlb(port, 0x57)|0x0c);
2413 printk("disabled read-ahead, enabled secondary\n");
2414
2415 }
2416 #endif /* SUPPORT_CMD640 */
2417
2418 /*
2419 * stridx() returns the offset of c within s,
2420 * or -1 if c is '\0' or not found within s.
2421 */
2422 static int stridx (const char *s, char c)
/* */
2423 {
2424 char *i = strchr(s, c);
2425 return (i && c) ? i - s : -1;
2426 }
2427
2428 /*
2429 * match_parm() does parsing for ide_setup():
2430 *
2431 * 1. the first char of s must be '='.
2432 * 2. if the remainder matches one of the supplied keywords,
2433 * the index (1 based) of the keyword is negated and returned.
2434 * 3. if the remainder is a series of no more than max_vals numbers
2435 * separated by commas, the numbers are saved in vals[] and a
2436 * count of how many were saved is returned. Base10 is assumed,
2437 * and base16 is allowed when prefixed with "0x".
2438 * 4. otherwise, zero is returned.
2439 */
2440 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2441 {
2442 static const char *decimal = "0123456789";
2443 static const char *hex = "0123456789abcdef";
2444 int i, n;
2445
2446 if (*s++ == '=') {
2447 /*
2448 * Try matching against the supplied keywords,
2449 * and return -(index+1) if we match one
2450 */
2451 for (i = 0; *keywords != NULL; ++i) {
2452 if (!strcmp(s, *keywords++))
2453 return -(i+1);
2454 }
2455 /*
2456 * Look for a series of no more than "max_vals"
2457 * numeric values separated by commas, in base10,
2458 * or base16 when prefixed with "0x".
2459 * Return a count of how many were found.
2460 */
2461 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2462 vals[n] = i;
2463 while ((i = stridx(decimal, *++s)) >= 0)
2464 vals[n] = (vals[n] * 10) + i;
2465 if (*s == 'x' && !vals[n]) {
2466 while ((i = stridx(hex, *++s)) >= 0)
2467 vals[n] = (vals[n] * 0x10) + i;
2468 }
2469 if (++n == max_vals)
2470 break;
2471 if (*s == ',')
2472 ++s;
2473 }
2474 if (!*s)
2475 return n;
2476 }
2477 return 0; /* zero = nothing matched */
2478 }
2479
2480 /*
2481 * ide_setup() gets called VERY EARLY during initialization,
2482 * to handle kernel "command line" strings beginning with "hdx="
2483 * or "ide". Here is the complete set currently supported:
2484 *
2485 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2486 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2487 *
2488 * "hdx=noprobe" : drive may be present, but do not probe for it
2489 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2490 * "hdx=cdrom" : drive is present, and is a cdrom drive
2491 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2492 *
2493 * "idex=noprobe" : do not attempt to access/use this interface
2494 * "idex=base" : probe for an interface at the addr specified,
2495 * where "base" is usually 0x1f0 or 0x170
2496 * and "ctl" is assumed to be "base"+0x206
2497 * "idex=base,ctl" : specify both base and ctl
2498 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2499 *
2500 * The following two are valid ONLY on ide0 or ide1,
2501 * and the defaults for the base,ctl ports must not be altered.
2502 *
2503 * "idex=serialize" : do not overlap operations on ide0 and ide1.
2504 * "idex=dtc2278" : enables use of DTC2278 secondary i/f
2505 * "idex=ht6560b" : enables use of HT6560B secondary i/f
2506 * "idex=cmd640_vlb" : required for VLB cards with the CMD640 chip
2507 * (PCI version will be automatically detected)
2508 */
2509 void ide_setup (char *s)
/* */
2510 {
2511 int vals[3];
2512 ide_hwif_t *hwif;
2513 ide_drive_t *drive;
2514 unsigned int hw, unit;
2515 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2516 const char max_hwif = '0' + (MAX_HWIFS - 1);
2517
2518 printk("ide_setup: %s", s);
2519 init_ide_data ();
2520
2521 /*
2522 * Look for drive options: "hdx="
2523 */
2524 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2525 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize", NULL};
2526 unit = s[2] - 'a';
2527 hw = unit / MAX_DRIVES;
2528 unit = unit % MAX_DRIVES;
2529 hwif = &ide_hwifs[hw];
2530 drive = &hwif->drives[unit];
2531 switch (match_parm(&s[3], hd_words, vals, 3)) {
2532 case -1: /* "noprobe" */
2533 drive->noprobe = 1;
2534 goto done;
2535 case -2: /* "nowerr" */
2536 drive->bad_wstat = BAD_R_STAT;
2537 hwif->noprobe = 0;
2538 goto done;
2539 case -3: /* "cdrom" */
2540 drive->present = 1;
2541 drive->media = cdrom;
2542 hwif->noprobe = 0;
2543 goto done;
2544 case -4: /* "serialize" */
2545 printk(" -- USE ""ide%c=serialize"" INSTEAD", '0'+hw);
2546 goto do_serialize;
2547 case 3: /* cyl,head,sect */
2548 drive->media = disk;
2549 drive->cyl = drive->bios_cyl = vals[0];
2550 drive->head = drive->bios_head = vals[1];
2551 drive->sect = drive->bios_sect = vals[2];
2552 drive->present = 1;
2553 hwif->noprobe = 0;
2554 goto done;
2555 default:
2556 goto bad_option;
2557 }
2558 }
2559 /*
2560 * Look for interface options: "idex="
2561 */
2562 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2563 const char *ide_words[] = {"noprobe", "serialize", "dtc2278", "ht6560b", "cmd640_vlb", NULL};
2564 hw = s[3] - '0';
2565 hwif = &ide_hwifs[hw];
2566
2567 switch (match_parm(&s[4], ide_words, vals, 3)) {
2568 #if SUPPORT_CMD640
2569 case -5: /* "cmd640_vlb" */
2570 if (hw > 1) goto bad_hwif;
2571 init_cmd640_vlb();
2572 goto do_serialize; /* not necessary once we implement the above */
2573 break;
2574 #endif /* SUPPORT_CMD640 */
2575 #if SUPPORT_HT6560B
2576 case -4: /* "ht6560b" */
2577 if (hw > 1) goto bad_hwif;
2578 /*
2579 * Using 0x1c and 0x1d apparently selects a
2580 * faster interface speed than 0x3c and 0x3d.
2581 *
2582 * Need to add an ioctl to select between them.
2583 */
2584 if (check_region(0x3e6,1)) {
2585 printk(" -- HT6560 PORT 0x3e6 ALREADY IN USE");
2586 goto done;
2587 }
2588 request_region(0x3e6, 1, hwif->name);
2589 ide_hwifs[0].select = 0x3c;
2590 ide_hwifs[1].select = 0x3d;
2591 goto do_serialize;
2592 #endif /* SUPPORT_HT6560B */
2593 #if SUPPORT_DTC2278
2594 case -3: /* "dtc2278" */
2595 if (hw > 1) goto bad_hwif;
2596 init_dtc2278();
2597 goto do_serialize;
2598 #endif /* SUPPORT_DTC2278 */
2599 case -2: /* "serialize" */
2600 do_serialize:
2601 if (hw > 1) goto bad_hwif;
2602 single_threaded = 1;
2603 goto done;
2604 case -1: /* "noprobe" */
2605 hwif->noprobe = 1;
2606 goto done;
2607 case 1: /* base */
2608 vals[1] = vals[0] + 0x206; /* default ctl */
2609 case 2: /* base,ctl */
2610 vals[2] = 0; /* default irq = probe for it */
2611 case 3: /* base,ctl,irq */
2612 hwif->io_base = vals[0];
2613 hwif->ctl_port = vals[1];
2614 hwif->irq = vals[2];
2615 hwif->noprobe = 0;
2616 goto done;
2617 }
2618 }
2619 bad_option:
2620 printk(" -- BAD OPTION\n");
2621 return;
2622 bad_hwif:
2623 printk("-- NOT SUPPORTED ON ide%d", hw);
2624 done:
2625 printk("\n");
2626 }
2627
2628 /*
2629 * This routine is called from the partition-table code in genhd.c
2630 * to "convert" a drive to a logical geometry with fewer than 1024 cyls
2631 * It mimics the method used by Ontrack Disk Manager.
2632 */
2633 int ide_xlate_1024 (kdev_t i_rdev, int offset, const char *msg)
/* */
2634 {
2635 ide_drive_t *drive;
2636 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2637 const byte *heads = head_vals;
2638 unsigned long tracks;
2639
2640 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->id == NULL)
2641 return 0;
2642
2643 drive->cyl = drive->bios_cyl = drive->id->cyls;
2644 drive->head = drive->bios_head = drive->id->heads;
2645 drive->sect = drive->bios_sect = drive->id->sectors;
2646 drive->special.b.set_geometry = 1;
2647
2648 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2649 drive->bios_sect = 63;
2650 while (drive->bios_cyl >= 1024) {
2651 drive->bios_head = *heads;
2652 drive->bios_cyl = tracks / drive->bios_head;
2653 if (0 == *++heads)
2654 break;
2655 }
2656 if (offset) {
2657 #if FAKE_FDISK_FOR_EZDRIVE
2658 if (offset == -1)
2659 drive->ezdrive = 1;
2660 else
2661 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2662 {
2663 drive->sect0 = 63;
2664 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2665 }
2666 }
2667 drive->part[0].nr_sects = current_capacity(drive);
2668 printk("%s [%d/%d/%d]", msg, drive->bios_cyl, drive->bios_head, drive->bios_sect);
2669 return 1;
2670 }
2671
2672 /*
2673 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2674 * controller that is BIOS compatible with ST-506, and thus showing up in our
2675 * BIOS table, but not register compatible, and therefore not present in CMOS.
2676 *
2677 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2678 * drives in the system -- the ones reflected as drive 1 or 2. The first
2679 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2680 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2681 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2682 * means we have an AT controller hard disk for that drive.
2683 *
2684 * Of course, there is no guarantee that either drive is actually on the
2685 * "primary" IDE interface, but we don't bother trying to sort that out here.
2686 * If a drive is not actually on the primary interface, then these parameters
2687 * will be ignored. This results in the user having to supply the logical
2688 * drive geometry as a boot parameter for each drive not on the primary i/f.
2689 *
2690 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2691 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2692 * for us during initialization. I have the necessary docs -- any takers? -ml
2693 */
2694
2695 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2696 {
2697 #ifdef __i386__
2698 extern struct drive_info_struct drive_info;
2699 byte cmos_disks, *BIOS = (byte *) &drive_info;
2700 int unit;
2701
2702 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2703 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2704 /* Extract drive geometry from CMOS+BIOS if not already setup */
2705 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2706 ide_drive_t *drive = &hwif->drives[unit];
2707 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2708 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2709 drive->head = drive->bios_head = *(BIOS+2);
2710 drive->sect = drive->bios_sect = *(BIOS+14);
2711 drive->ctl = *(BIOS+8);
2712 drive->present = 1;
2713 }
2714 BIOS += 16;
2715 }
2716 #endif
2717 }
2718
2719 /*
2720 * This routine sets up the irq for an ide interface, and creates a new
2721 * hwgroup for the irq/hwif if none was previously assigned.
2722 *
2723 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2724 * interrupts completely disabled. This can be bad for interrupt latency,
2725 * but anything else has led to problems on some machines. We re-enable
2726 * interrupts as much as we can safely do in most places.
2727 */
2728 static int init_irq (ide_hwif_t *hwif)
/* */
2729 {
2730 unsigned long flags;
2731 ide_hwgroup_t *hwgroup;
2732
2733 /*
2734 * First, we try to grab the irq
2735 */
2736 save_flags(flags);
2737 cli();
2738 if (request_irq(hwif->irq, ide_intr,
2739 SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2740 restore_flags(flags);
2741 printk(" -- FAILED!");
2742 return 1;
2743 }
2744
2745 /*
2746 * Got the irq, now set everything else up
2747 */
2748 if ((hwgroup = irq_to_hwgroup[hwif->irq]) == NULL) {
2749 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2750 irq_to_hwgroup[hwif->irq] = hwgroup;
2751 hwgroup->hwif = hwif->next = hwif;
2752 hwgroup->rq = NULL;
2753 hwgroup->handler = NULL;
2754 hwgroup->drive = NULL;
2755 hwgroup->reset_timeout = 0;
2756 #ifdef CONFIG_BLK_DEV_IDECD
2757 hwgroup->doing_atapi_reset = 0;
2758 #endif /* CONFIG_BLK_DEV_IDECD */
2759 init_timer(&hwgroup->timer);
2760 hwgroup->timer.function = &timer_expiry;
2761 hwgroup->timer.data = (unsigned long) hwgroup;
2762 } else {
2763 hwif->next = hwgroup->hwif->next;
2764 hwgroup->hwif->next = hwif;
2765 }
2766 hwif->hwgroup = hwgroup;
2767
2768 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2769
2770 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2771 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
2772 if (hwgroup->hwif != hwif) {
2773 char *name = hwgroup->hwif->name;
2774 if (hwgroup->hwif->irq == hwif->irq)
2775 printk(" (shared with %s)", name);
2776 else
2777 printk(" (serialized with %s)", name);
2778 }
2779 printk("\n");
2780 return 0;
2781 }
2782
2783 static struct file_operations ide_fops = {
2784 NULL, /* lseek - default */
2785 block_read, /* read - general block-dev read */
2786 block_write, /* write - general block-dev write */
2787 NULL, /* readdir - bad */
2788 NULL, /* select */
2789 ide_ioctl, /* ioctl */
2790 NULL, /* mmap */
2791 ide_open, /* open */
2792 ide_release, /* release */
2793 block_fsync /* fsync */
2794 ,NULL, /* fasync */
2795 ide_check_media_change, /* check_media_change */
2796 revalidate_disk /* revalidate */
2797 };
2798
2799 #ifdef CONFIG_PCI
2800
2801 void ide_pci_access_error (int rc)
/* */
2802 {
2803 printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
2804 }
2805
2806 #if SUPPORT_RZ1000 || SUPPORT_CMD640
2807 void buggy_interface_fallback (int rc)
/* */
2808 {
2809 ide_pci_access_error (rc);
2810 single_threaded = 1;
2811 disallow_unmask = 1;
2812 printk("serialized, disabled unmasking\n");
2813 }
2814 #endif /* SUPPORT_RZ1000 || SUPPORT_CMD640 */
2815
2816 #if SUPPORT_RZ1000
2817 void init_rz1000 (byte bus, byte fn)
/* */
2818 {
2819 int rc;
2820 unsigned short reg;
2821
2822 printk("ide: buggy RZ1000 interface: ");
2823 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, ®))) {
2824 ide_pci_access_error (rc);
2825 } else if (!(reg & 1)) {
2826 printk("not enabled\n");
2827 } else {
2828 if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
2829 || (rc = pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
2830 buggy_interface_fallback (rc);
2831 else
2832 printk("disabled read-ahead\n");
2833 }
2834 }
2835 #endif /* SUPPORT_RZ1000 */
2836
2837 #if SUPPORT_CMD640
2838 void init_cmd640 (byte bus, byte fn)
/* */
2839 {
2840 int rc;
2841 unsigned char reg;
2842
2843 single_threaded = 1;
2844 printk("ide: buggy CMD640 interface: ");
2845
2846 #if 0 /* funny.. the cmd640b I tried this on claimed to not be enabled.. */
2847 unsigned short sreg;
2848 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &sreg))) {
2849 ide_pci_access_error (rc);
2850 } else if (!(sreg & 1)) {
2851 printk("not enabled\n");
2852 } else {
2853 #endif /* 0 */
2854
2855 /*
2856 * The first part is undocumented magic from the DOS driver.
2857 * According to the datasheet, there is no port 0x5b on the cmd640.
2858 */
2859 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0xbd);
2860 if (pcibios_write_config_byte(bus, fn, 0x5b, 0xbd) != 0xbd)
2861 printk("init_cmd640: huh? 0x5b read back wrong\n");
2862 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0);
2863 /*
2864 * The rest is from the cmd640b datasheet.
2865 */
2866 if ((rc = pcibios_read_config_byte(bus, fn, 0x51, ®))
2867 || (rc = pcibios_write_config_byte(bus, fn, 0x51, reg | 0xc0)) /* 0xc8 to enable 2nd i/f */
2868 || (rc = pcibios_read_config_byte(bus, fn, 0x57, ®))
2869 || (rc = pcibios_write_config_byte(bus, fn, 0x57, reg | 0x0c)))
2870 buggy_interface_fallback (rc);
2871 else
2872 printk("serialized, disabled read-ahead\n");
2873 }
2874 #endif /* SUPPORT_CMD640 */
2875
2876 typedef void (ide_pci_init_proc_t)(byte, byte);
2877
2878 /*
2879 * ide_probe_pci() scans PCI for a specific vendor/device function,
2880 * and invokes the supplied init routine for each instance detected.
2881 */
2882 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init)
/* */
2883 {
2884 unsigned long flags;
2885 unsigned index;
2886 byte fn, bus;
2887
2888 save_flags(flags);
2889 cli();
2890 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2891 init (bus, fn);
2892 }
2893 restore_flags(flags);
2894 }
2895
2896 /*
2897 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2898 *
2899 * This routine should ideally be using pcibios_find_class() to find
2900 * all IDE interfaces, but that function causes some systems to "go weird".
2901 */
2902 static void ide_init_pci (void)
/* */
2903 {
2904 #if SUPPORT_RZ1000
2905 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000);
2906 #endif
2907 #if SUPPORT_CMD640
2908 ide_probe_pci (PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_CMD_640, &init_cmd640);
2909 #endif
2910 #ifdef CONFIG_BLK_DEV_TRITON
2911 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_1, &ide_init_triton);
2912 #endif
2913 }
2914 #endif /* CONFIG_PCI */
2915
2916 /*
2917 * This is gets invoked once during initialization, to set *everything* up
2918 */
2919 int ide_init (void)
/* ![[last]](../icons/n_last.png)
*/
2920 {
2921 int h;
2922
2923 init_ide_data ();
2924 /*
2925 * First, we determine what hardware is present
2926 */
2927
2928 #ifdef CONFIG_PCI
2929 /*
2930 * Find/initialize PCI IDE interfaces
2931 */
2932 if (pcibios_present())
2933 ide_init_pci ();
2934 #endif /* CONFIG_PCI */
2935
2936 /*
2937 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
2938 */
2939 for (h = 0; h < MAX_HWIFS; ++h) {
2940 ide_hwif_t *hwif = &ide_hwifs[h];
2941 if (!hwif->noprobe) {
2942 if (hwif->io_base == HD_DATA)
2943 probe_cmos_for_drives (hwif);
2944 probe_for_drives (hwif);
2945 }
2946 if (hwif->present) {
2947 if (!hwif->irq) {
2948 if (!(hwif->irq = default_irqs[h])) {
2949 printk("%s: DISABLED, NO IRQ\n", hwif->name);
2950 hwif->present = 0;
2951 continue;
2952 }
2953 }
2954 #ifdef CONFIG_BLK_DEV_HD
2955 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
2956 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
2957 hwif->present = 0;
2958 }
2959 #endif /* CONFIG_BLK_DEV_HD */
2960 }
2961 }
2962
2963 /*
2964 * Now we try to set up irqs and major devices for what was found
2965 */
2966 for (h = MAX_HWIFS-1; h >= 0; --h) {
2967 void (*rfn)(void);
2968 ide_hwif_t *hwif = &ide_hwifs[h];
2969 if (!hwif->present)
2970 continue;
2971 hwif->present = 0; /* we set it back to 1 if all is ok below */
2972 if (h == 0 && single_threaded) {
2973 if (ide_hwifs[1].present) {
2974 if (irq_to_hwgroup[hwif->irq] != NULL) {
2975 printk("%s: SERIALIZE BUG!\n", hwif->name);
2976 continue;
2977 }
2978 irq_to_hwgroup[hwif->irq] = irq_to_hwgroup[ide_hwifs[1].irq];
2979 }
2980 }
2981 switch (hwif->major) {
2982 case IDE0_MAJOR: rfn = &do_ide0_request; break;
2983 case IDE1_MAJOR: rfn = &do_ide1_request; break;
2984 case IDE2_MAJOR: rfn = &do_ide2_request; break;
2985 case IDE3_MAJOR: rfn = &do_ide3_request; break;
2986 default:
2987 printk("%s: request_fn NOT DEFINED\n", hwif->name);
2988 continue;
2989 }
2990 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
2991 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
2992 } else if (init_irq (hwif)) {
2993 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
2994 (void) unregister_blkdev (hwif->major, hwif->name);
2995 } else {
2996 init_gendisk(hwif);
2997 blk_dev[hwif->major].request_fn = rfn;
2998 read_ahead[hwif->major] = 8; /* (4kB) */
2999 hwif->present = 1; /* success */
3000 }
3001 }
3002 return 0;
3003 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/