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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.18 Nov 16, 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 * It is easy to extend ide.c to handle more than four interfaces:
18 *
19 * Change the MAX_HWIFS constant in ide.h.
20 *
21 * Define some new major numbers (in major.h), and insert them into
22 * the ide_hwif_to_major table in ide.c.
23 *
24 * Fill in the extra values for the new interfaces into the two tables
25 * inside ide.c: default_io_base[] and default_irqs[].
26 *
27 * Create the new request handlers by cloning "do_ide3_request()"
28 * for each new interface, and add them to the switch statement
29 * in the ide_init() function in ide.c.
30 *
31 * Recompile, create the new /dev/ entries, and it will probably work.
32 *
33 * From hd.c:
34 * |
35 * | It traverses the request-list, using interrupts to jump between functions.
36 * | As nearly all functions can be called within interrupts, we may not sleep.
37 * | Special care is recommended. Have Fun!
38 * |
39 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
40 * |
41 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
42 * | in the early extended-partition checks and added DM partitions.
43 * |
44 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
45 * |
46 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
47 * | and general streamlining by Mark Lord (mlord@bnr.ca).
48 *
49 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
50 *
51 * Mark Lord (mlord@bnr.ca) (IDE Perf.Pkg)
52 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
53 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
54 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
55 *
56 * Maintained by Mark Lord (mlord@bnr.ca): ide.c, ide.h, triton.c, hd.c, ..
57 *
58 * This was a rewrite of just about everything from hd.c, though some original
59 * code is still sprinkled about. Think of it as a major evolution, with
60 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
61 *
62 * Version 1.0 ALPHA initial code, primary i/f working okay
63 * Version 1.3 BETA dual i/f on shared irq tested & working!
64 * Version 1.4 BETA added auto probing for irq(s)
65 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
66 * ...
67 * Version 3.5 correct the bios_cyl field if it's too small
68 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
69 * Version 3.6 cosmetic corrections to comments and stuff
70 * (linux 1.1.77) reorganise probing code to make it understandable
71 * added halfway retry to probing for drive identification
72 * added "hdx=noprobe" command line option
73 * allow setting multmode even when identification fails
74 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
75 * increase DRQ_WAIT to eliminate nuisance messages
76 * wait for DRQ_STAT instead of DATA_READY during probing
77 * (courtesy of Gary Thomas gary@efland.UU.NET)
78 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
79 * update of ide-cd.c from Scott, allows blocksize=1024
80 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
81 * Version 3.9 don't use LBA if lba_capacity looks funny
82 * correct the drive capacity calculations
83 * fix probing for old Seagates without IDE_ALTSTATUS_REG
84 * fix byte-ordering for some NEC cdrom drives
85 * Version 3.10 disable multiple mode by default; was causing trouble
86 * Version 3.11 fix mis-identification of old WD disks as cdroms
87 * Version 3,12 simplify logic for selecting initial mult_count
88 * (fixes problems with buggy WD drives)
89 * Version 3.13 remove excess "multiple mode disabled" messages
90 * Version 3.14 fix ide_error() handling of BUSY_STAT
91 * fix byte-swapped cdrom strings (again.. arghh!)
92 * ignore INDEX bit when checking the ALTSTATUS reg
93 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
94 * ignore WRERR_STAT for non-write operations
95 * added vlb_sync support for DC-2000A & others,
96 * (incl. some Promise chips), courtesy of Frank Gockel
97 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
98 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
99 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
100 * add boot flag to "serialize" operation for CMD i/f
101 * add optional support for DTC2278 interfaces,
102 * courtesy of andy@cercle.cts.com (Dyan Wile).
103 * add boot flag to enable "dtc2278" probe
104 * add probe to avoid EATA (SCSI) interfaces,
105 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
106 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
107 * add flag to ignore WRERR_STAT for some drives
108 * courtesy of David.H.West@um.cc.umich.edu
109 * assembly syntax tweak to vlb_sync
110 * removeable drive support from scuba@cs.tu-berlin.de
111 * add transparent support for DiskManager-6.0x "Dynamic
112 * Disk Overlay" (DDO), most of this in in genhd.c
113 * eliminate "multiple mode turned off" message at boot
114 * Version 4.10 fix bug in ioctl for "hdparm -c3"
115 * fix DM6:DDO support -- now works with LILO, fdisk, ...
116 * don't treat some naughty WD drives as removeable
117 * Version 4.11 updated DM6 support using info provided by OnTrack
118 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
119 * added support for 3rd/4th/alternative IDE ports
120 * created ide.h; ide-cd.c now compiles separate from ide.c
121 * hopefully fixed infinite "unexpected_intr" from cdroms
122 * zillions of other changes and restructuring
123 * somehow reduced overall memory usage by several kB
124 * probably slowed things down slightly, but worth it
125 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
126 * was happening at various times/places: whenever the
127 * ide-interface's ctl_port was used to "mask" the irq,
128 * it also would trigger an edge in the process of masking
129 * which would result in a self-inflicted interrupt!!
130 * (such a stupid way to build a hardware interrupt mask).
131 * This is now fixed (after a year of head-scratching).
132 * Version 5.02 got rid of need for {enable,disable}_irq_list()
133 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
134 * removed PROBE_FOR_IRQS option -- no longer needed
135 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
136 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
137 * added more comments, cleaned up unexpected_intr()
138 * OOOPS! fixed null pointer problem in ide reset code
139 * added autodetect for Triton chipset -- no effect yet
140 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
141 * OOOPS! fixed bug in ide_do_request()
142 * added ATAPI reset sequence for cdroms
143 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
144 * some (mostly) cosmetic changes
145 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
146 * reworked PCI scanning code
147 * added automatic RZ1000 detection/support
148 * added automatic PCI CMD640 detection/support
149 * added option for VLB CMD640 support
150 * tweaked probe to find cdrom on hdb with disks on hda,hdc
151 * Version 5.12 some performance tuning
152 * added message to alert user to bad /dev/hd[cd] entries
153 * OOOPS! fixed bug in atapi reset
154 * driver now forces "serialize" again for all cmd640 chips
155 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
156 * made do_drive_cmd() into public ide_do_drive_cmd()
157 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
158 * fixed ht6560b support
159 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
160 * don't bother invalidating nonexistent partitions
161 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
162 * added & tested full EZ-DRIVE support -- don't use LILO!
163 * don't enable 2nd CMD640 PCI port during init - conflict
164 * Version 5.15 bug fix in init_cmd640_vlb()
165 * bug fix in interrupt sharing code
166 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
167 * remove "Huh?" from cmd640 code
168 * added qd6580 interface speed select from Colten Edwards
169 * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
170 * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
171 * new UMC8672 code, moved to umc8672.c, #include'd for now
172 * disallow turning on DMA when h/w not capable of DMA
173 *
174 * Driver compile-time options are in ide.h
175 *
176 * To do, in likely order of completion:
177 * - make cmd640.c and umc8672.c compile separately from ide.c
178 * - add ALI M1443/1445 chipset support from derekn@vw.ece.cmu.edu
179 * - add ioctls to get/set interface timings on various interfaces
180 * - add Promise Caching controller support from peterd@pnd-pc.demon.co.uk
181 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
182 * - find someone to work on IDE *tape drive* support
183 */
184
185 #undef REALLY_SLOW_IO /* most systems can safely undef this */
186
187 #include <linux/config.h>
188 #include <linux/types.h>
189 #include <linux/string.h>
190 #include <linux/kernel.h>
191 #include <linux/delay.h>
192 #include <linux/timer.h>
193 #include <linux/mm.h>
194 #include <linux/ioport.h>
195 #include <linux/interrupt.h>
196 #include <linux/major.h>
197 #include <linux/blkdev.h>
198 #include <linux/errno.h>
199 #include <linux/hdreg.h>
200 #include <linux/genhd.h>
201 #include <linux/malloc.h>
202
203 #include <asm/byteorder.h>
204 #include <asm/irq.h>
205 #include <asm/segment.h>
206 #include <asm/io.h>
207
208 #ifdef CONFIG_PCI
209 #include <linux/bios32.h>
210 #include <linux/pci.h>
211 #endif /* CONFIG_PCI */
212
213 #include "ide.h"
214
215 #ifdef SUPPORT_CMD640
216 void cmd640_tune_drive(ide_drive_t *);
217 static int cmd640_vlb = 0;
218 #endif
219
220 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* hwif info */
221 static ide_hwgroup_t *irq_to_hwgroup [16];
222 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
223
224 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
225 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
226 static int serialized = 0; /* "serialize" option */
227 static int disallow_unmask = 0; /* for buggy hardware */
228
229 #if (DISK_RECOVERY_TIME > 0)
230 /*
231 * For really screwy hardware (hey, at least it *can* be used with Linux)
232 * we can enforce a minimum delay time between successive operations.
233 */
234 static unsigned long read_timer(void)
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235 {
236 unsigned long t, flags;
237 int i;
238
239 save_flags(flags);
240 cli();
241 t = jiffies * 11932;
242 outb_p(0, 0x43);
243 i = inb_p(0x40);
244 i |= inb(0x40) << 8;
245 restore_flags(flags);
246 return (t - i);
247 }
248
249 void ide_set_recovery_timer (ide_hwif_t *hwif)
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250 {
251 hwif->last_time = read_timer();
252 }
253 #endif /* DISK_RECOVERY_TIME */
254
255 /*
256 * init_ide_data() sets reasonable default values into all fields
257 * of all instances of the hwifs and drives, but only on the first call.
258 * Subsequent calls have no effect (they don't wipe out anything).
259 *
260 * This routine is normally called at driver initialization time,
261 * but may also be called MUCH earlier during kernel "command-line"
262 * parameter processing. As such, we cannot depend on any other parts
263 * of the kernel (such as memory allocation) to be functioning yet.
264 *
265 * This is too bad, as otherwise we could dynamically allocate the
266 * ide_drive_t structs as needed, rather than always consuming memory
267 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
268 */
269 #define MAGIC_COOKIE 0x12345678
270 static void init_ide_data (void)
/* */
271 {
272 byte *p;
273 unsigned int h, unit;
274 static unsigned long magic_cookie = MAGIC_COOKIE;
275
276 if (magic_cookie != MAGIC_COOKIE)
277 return; /* already initialized */
278 magic_cookie = 0;
279
280 for (h = 0; h < 16; ++h)
281 irq_to_hwgroup[h] = NULL;
282
283 /* bulk initialize hwif & drive info with zeros */
284 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
285 do {
286 *--p = 0;
287 } while (p > (byte *) ide_hwifs);
288
289 for (h = 0; h < MAX_HWIFS; ++h) {
290 ide_hwif_t *hwif = &ide_hwifs[h];
291
292 /* fill in any non-zero initial values */
293 hwif->noprobe = (h > 1);
294 hwif->io_base = default_io_base[h];
295 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
296 #ifdef CONFIG_BLK_DEV_HD
297 if (hwif->io_base == HD_DATA)
298 hwif->noprobe = 1; /* may be overriden by ide_setup() */
299 #endif /* CONFIG_BLK_DEV_HD */
300 hwif->major = ide_hwif_to_major[h];
301 hwif->name[0] = 'i';
302 hwif->name[1] = 'd';
303 hwif->name[2] = 'e';
304 hwif->name[3] = '0' + h;
305
306 for (unit = 0; unit < MAX_DRIVES; ++unit) {
307 ide_drive_t *drive = &hwif->drives[unit];
308
309 /* fill in any non-zero initial values */
310 drive->select.all = (unit<<4)|0xa0;
311 drive->hwif = hwif;
312 drive->ctl = 0x08;
313 drive->ready_stat = READY_STAT;
314 drive->bad_wstat = BAD_W_STAT;
315 drive->special.b.recalibrate = 1;
316 drive->special.b.set_geometry = 1;
317 drive->name[0] = 'h';
318 drive->name[1] = 'd';
319 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
320 }
321 }
322 }
323
324 #define VLB_SYNC 1
325 /*
326 * Some localbus EIDE interfaces require a special access sequence
327 * when using 32-bit I/O instructions to transfer data. We call this
328 * the "vlb_sync" sequence, which consists of three successive reads
329 * of the sector count register location, with interrupts disabled
330 * to ensure that the reads all happen together.
331 */
332 static inline void do_vlb_sync (unsigned short port) {
/* */
333 (void) inb (port);
334 (void) inb (port);
335 (void) inb (port);
336 }
337
338 /*
339 * This is used for most PIO data transfers *from* the IDE interface
340 */
341 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
342 {
343 unsigned short io_base = HWIF(drive)->io_base;
344 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
345
346 if (drive->vlb_32bit) {
347 #ifdef VLB_SYNC
348 if (drive->vlb_sync) {
349 cli();
350 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
351 insl(data_reg, buffer, wcount);
352 if (drive->unmask)
353 sti();
354 } else
355 #endif /* VLB_SYNC */
356 insl(data_reg, buffer, wcount);
357 } else
358 insw(data_reg, buffer, wcount<<1);
359 }
360
361 /*
362 * This is used for most PIO data transfers *to* the IDE interface
363 */
364 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
365 {
366 unsigned short io_base = HWIF(drive)->io_base;
367 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
368
369 if (drive->vlb_32bit) {
370 #ifdef VLB_SYNC
371 if (drive->vlb_sync) {
372 cli();
373 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
374 outsl(data_reg, buffer, wcount);
375 if (drive->unmask)
376 sti();
377 } else
378 #endif /* VLB_SYNC */
379 outsl(data_reg, buffer, wcount);
380 } else
381 outsw(data_reg, buffer, wcount<<1);
382 }
383
384 #if SUPPORT_HT6560B
385 /*
386 * This routine handles interface switching for the peculiar hardware design
387 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
388 * The HT-6560B can only enable one IDE port at a time, and requires a
389 * silly sequence (below) whenever we switch between primary and secondary.
390 *
391 * Apparently, systems with multiple CMD640 chips may need something similar..
392 *
393 * This algorithm courtesy of malafoss@snakemail.hut.fi
394 */
395
396 void ide_hwif_select (ide_hwif_t *hwif)
/* */
397 {
398 static byte current_select = 0;
399
400 if (hwif->select != current_select) {
401 unsigned long flags;
402 save_flags (flags);
403 cli();
404 current_select = hwif->select;
405 (void) inb(0x3e6);
406 (void) inb(0x3e6);
407 (void) inb(0x3e6);
408 (void) inb(0x3e6);
409 outb(current_select,0x3e6);
410 restore_flags (flags);
411 }
412 }
413 #endif /* SUPPORT_HT6560B */
414
415 /*
416 * This should get invoked any time we exit the driver to
417 * wait for an interrupt response from a drive. handler() points
418 * at the appropriate code to handle the next interrupt, and a
419 * timer is started to prevent us from waiting forever in case
420 * something goes wrong (see the timer_expiry() handler later on).
421 */
422 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler)
/* */
423 {
424 ide_hwgroup_t *hwgroup = HWGROUP(drive);
425 #ifdef DEBUG
426 if (hwgroup->handler != NULL)
427 printk("%s: ide_set_handler: old handler not null\n", drive->name);
428 #endif
429 hwgroup->handler = handler;
430 hwgroup->timer.expires = jiffies + WAIT_CMD;
431 add_timer(&(hwgroup->timer));
432 }
433
434 /*
435 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
436 * value for this drive (from its reported identification information).
437 *
438 * Returns: 1 if lba_capacity looks sensible
439 * 0 otherwise
440 */
441 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
442 {
443 unsigned long lba_sects = id->lba_capacity;
444 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
445 unsigned long _10_percent = chs_sects / 10;
446
447 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
448 if ((lba_sects - chs_sects) < _10_percent)
449 return 1; /* lba_capacity is good */
450
451 /* some drives have the word order reversed */
452 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
453 if ((lba_sects - chs_sects) < _10_percent) {
454 id->lba_capacity = lba_sects; /* fix it */
455 return 1; /* lba_capacity is (now) good */
456 }
457 return 0; /* lba_capacity value is bad */
458 }
459
460 /*
461 * current_capacity() returns the capacity (in sectors) of a drive
462 * according to its current geometry/LBA settings.
463 */
464 static unsigned long current_capacity (ide_drive_t *drive)
/* */
465 {
466 struct hd_driveid *id = drive->id;
467 unsigned long capacity;
468
469 if (!drive->present)
470 return 0;
471 if (drive->media != disk)
472 return 0x1fffff; /* cdrom */
473 /* Determine capacity, and use LBA if the drive properly supports it */
474 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
475 drive->select.b.lba = 1;
476 capacity = id->lba_capacity;
477 } else {
478 drive->select.b.lba = 0;
479 capacity = drive->cyl * drive->head * drive->sect;
480 }
481 return (capacity - drive->sect0);
482 }
483
484 /*
485 * ide_geninit() is called exactly *once* for each major, from genhd.c,
486 * at the beginning of the initial partition check for the drives.
487 */
488 static void ide_geninit (struct gendisk *gd)
/* */
489 {
490 unsigned int unit;
491 ide_hwif_t *hwif = gd->real_devices;
492
493 for (unit = 0; unit < gd->nr_real; ++unit) {
494 ide_drive_t *drive = &hwif->drives[unit];
495 #ifdef CONFIG_BLK_DEV_IDECD
496 if (drive->present && drive->media == cdrom)
497 ide_cdrom_setup(drive);
498 #endif /* CONFIG_BLK_DEV_IDECD */
499 drive->part[0].nr_sects = current_capacity(drive);
500 if (!drive->present || drive->media != disk) {
501 drive->part[0].start_sect = -1; /* skip partition check */
502 }
503 }
504 /*
505 * The partition check in genhd.c needs this string to identify
506 * our minor devices by name for display purposes.
507 * Note that doing this will prevent us from working correctly
508 * if ever called a second time for this major (never happens).
509 */
510 gd->real_devices = hwif->drives[0].name; /* name of first drive */
511 }
512
513 /*
514 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
515 * after probing for drives, to allocate partition tables and other data
516 * structures needed for the routines in genhd.c. ide_geninit() gets called
517 * somewhat later, during the partition check.
518 */
519 static void init_gendisk (ide_hwif_t *hwif)
/* */
520 {
521 struct gendisk *gd;
522 unsigned int unit, units, minors;
523 int *bs;
524
525 /* figure out maximum drive number on the interface */
526 for (units = MAX_DRIVES; units > 0; --units) {
527 if (hwif->drives[units-1].present)
528 break;
529 }
530 minors = units * (1<<PARTN_BITS);
531 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
532 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
533 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
534 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
535
536 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
537 blksize_size[hwif->major] = bs;
538 for (unit = 0; unit < minors; ++unit)
539 *bs++ = BLOCK_SIZE;
540
541 for (unit = 0; unit < units; ++unit)
542 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
543
544 gd->major = hwif->major; /* our major device number */
545 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
546 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
547 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
548 gd->max_nr = units; /* max num real drives */
549 gd->nr_real = units; /* current num real drives */
550 gd->init = ide_geninit; /* initialization function */
551 gd->real_devices= hwif; /* ptr to internal data */
552
553 gd->next = gendisk_head; /* link new major into list */
554 hwif->gd = gendisk_head = gd;
555 }
556
557 static void unexpected_intr (int, ide_hwgroup_t *);
558 /*
559 * reset_ihandler() is a dummy interrupt handler which we install during
560 * an ide interface reset operation. This prevents other devices in the
561 * same hwgroup from being serviced while we play around with shared resources.
562 * If it ever gets invoked, we call unexpected_intr(), which treats the event
563 * the same as a timer_expiry().
564 */
565 static void reset_ihandler (ide_drive_t *drive)
/* */
566 {
567 unsigned long flags;
568
569 save_flags(flags);
570 cli();
571 unexpected_intr (HWIF(drive)->irq, HWGROUP(drive));
572 restore_flags(flags);
573 }
574
575 /*
576 * start_reset_timer() sets up a timer event for 50ms in the future,
577 * to poll for completion of an ide reset operation (no interrupt to help us).
578 */
579 static void start_reset_timer (ide_hwif_t *hwif)
/* */
580 {
581 ide_hwgroup_t *hwgroup = hwif->hwgroup;
582
583 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE; /* max waiting time */
584 hwgroup->handler = &reset_ihandler; /* dummy irq handler */
585 hwgroup->timer.expires = jiffies + (HZ/20); /* polling interval */
586 add_timer(&(hwgroup->timer));
587 }
588
589 #ifdef CONFIG_BLK_DEV_IDECD
590 /*
591 * atapi_reset_handler() gets invoked to poll the interface for completion every 50ms
592 * during an atapi drive reset operation. If the drive has not yet responded,
593 * and we have not yet hit our maximum waiting time, then the timer is restarted
594 * for another 50ms.
595 *
596 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
597 */
598 static int atapi_reset_handler (ide_hwgroup_t *hwgroup)
/* */
599 {
600 ide_hwif_t *hwif = hwgroup->hwif;
601 ide_drive_t *drive = hwgroup->drive;
602 byte stat;
603
604 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
605 udelay (10);
606
607 if (!OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
608 if (jiffies < hwgroup->reset_timeout) {
609 start_reset_timer (hwif);
610 return 1;
611 }
612 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
613 return ide_do_reset (drive); /* do it the old fashioned way */
614 }
615 hwgroup->doing_atapi_reset = 0;
616 hwgroup->handler = NULL; /* allow new requests to be processed */
617 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
618 printk("%s: ATAPI reset complete\n", drive->name);
619 return 0;
620 }
621 #endif /* CONFIG_BLK_DEV_IDECD */
622
623 /*
624 * reset_handler() gets invoked to poll the interface for completion every 50ms
625 * during an ide reset operation. If the drives have not yet responded,
626 * and we have not yet hit our maximum waiting time, then the timer is restarted
627 * for another 50ms.
628 *
629 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
630 */
631 static int reset_handler (ide_hwgroup_t *hwgroup)
/* */
632 {
633 ide_hwif_t *hwif = hwgroup->hwif;
634 ide_drive_t *drive = hwgroup->drive;
635 byte tmp;
636
637 #ifdef CONFIG_BLK_DEV_IDECD
638 if (hwgroup->doing_atapi_reset)
639 return atapi_reset_handler(hwgroup);
640 #endif /* CONFIG_BLK_DEV_IDECD */
641
642 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
643 if (jiffies < hwgroup->reset_timeout) {
644 start_reset_timer (hwif);
645 return 1;
646 }
647 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
648 } else {
649 printk("%s: reset: ", hwif->name);
650 if ((tmp = GET_ERR()) == 1)
651 printk("success\n");
652 else {
653 printk("master: ");
654 switch (tmp & 0x7f) {
655 case 1: printk("passed");
656 break;
657 case 2: printk("formatter device error");
658 break;
659 case 3: printk("sector buffer error");
660 break;
661 case 4: printk("ECC circuitry error");
662 break;
663 case 5: printk("controlling MPU error");
664 break;
665 default:printk("error (0x%02x?)", tmp);
666 }
667 if (tmp & 0x80)
668 printk("; slave: failed");
669 printk("\n");
670 }
671 }
672 hwgroup->handler = NULL; /* allow new requests to be processed */
673 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
674 return 0;
675 }
676
677 /*
678 * ide_do_reset() attempts to recover a confused drive by resetting it.
679 * Unfortunately, resetting a disk drive actually resets all devices on
680 * the same interface, so it can really be thought of as resetting the
681 * interface rather than resetting the drive.
682 *
683 * ATAPI devices have their own reset mechanism which allows them to be
684 * individually reset without clobbering other devices on the same interface.
685 *
686 * Unfortunately, the IDE interface does not generate an interrupt to let
687 * us know when the reset operation has finished, so we must poll for this.
688 * Equally poor, though, is the fact that this may a very long time to complete,
689 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
690 * we set a timer to poll at 50ms intervals.
691 */
692 int ide_do_reset (ide_drive_t *drive)
/* */
693 {
694 unsigned int unit;
695 unsigned long flags;
696 ide_hwif_t *hwif = HWIF(drive);
697 ide_hwgroup_t *hwgroup = HWGROUP(drive);
698
699 save_flags(flags);
700 cli(); /* Why ? */
701
702 #ifdef CONFIG_BLK_DEV_IDECD
703 /* For an ATAPI device, first try an ATAPI SRST. */
704 if (drive->media == cdrom) {
705 if (!hwgroup->doing_atapi_reset) {
706 hwgroup->doing_atapi_reset = 1;
707 if (!drive->keep_settings)
708 drive->unmask = 0;
709 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
710 udelay (20);
711 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
712 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
713 start_reset_timer (hwif); /* begin periodic polling */
714 restore_flags (flags);
715 return 1;
716 }
717 }
718 hwgroup->doing_atapi_reset = 0;
719 #endif /* CONFIG_BLK_DEV_IDECD */
720
721 /*
722 * First, reset any device state data we were maintaining
723 * for any of the drives on this interface.
724 */
725 for (unit = 0; unit < MAX_DRIVES; ++unit) {
726 ide_drive_t *rdrive = &hwif->drives[unit];
727 rdrive->special.b.set_geometry = 1;
728 rdrive->special.b.recalibrate = 1;
729 rdrive->special.b.set_multmode = 0;
730 if (OK_TO_RESET_CONTROLLER)
731 rdrive->mult_count = 0;
732 if (!rdrive->keep_settings) {
733 rdrive->mult_req = 0;
734 rdrive->unmask = 0;
735 }
736 if (rdrive->mult_req != rdrive->mult_count)
737 rdrive->special.b.set_multmode = 1;
738 }
739
740 #if OK_TO_RESET_CONTROLLER
741 /*
742 * Note that we also set nIEN while resetting the device,
743 * to mask unwanted interrupts from the interface during the reset.
744 * However, due to the design of PC hardware, this will cause an
745 * immediate interrupt due to the edge transition it produces.
746 * This single interrupt gives us a "fast poll" for drives that
747 * recover from reset very quickly, saving us the first 50ms wait time.
748 */
749 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
750 udelay(5); /* more than enough time */
751 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
752 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
753 start_reset_timer (hwif); /* begin periodic polling */
754 #endif /* OK_TO_RESET_CONTROLLER */
755
756 restore_flags (flags);
757 return OK_TO_RESET_CONTROLLER; /* 1 = we are waiting, 0 = done */
758 }
759
760 /*
761 * Clean up after success/failure of an explicit (ioctl) drive cmd
762 */
763 static void end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
764 {
765 unsigned long flags;
766 struct request *rq = HWGROUP(drive)->rq;
767 byte *args = (byte *) rq->buffer;
768
769 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
770 if (args) {
771 args[0] = stat;
772 args[1] = err;
773 args[2] = IN_BYTE(IDE_NSECTOR_REG);
774 }
775 save_flags(flags);
776 cli();
777 up(rq->sem);
778 HWGROUP(drive)->rq = NULL;
779 restore_flags(flags);
780 }
781
782 /*
783 * Error reporting, in human readable form (luxurious, but a memory hog).
784 */
785 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
786 {
787 unsigned long flags;
788 byte err = 0;
789
790 save_flags (flags);
791 sti();
792 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
793 #if FANCY_STATUS_DUMPS
794 if (drive->media == disk) {
795 printk(" { ");
796 if (stat & BUSY_STAT)
797 printk("Busy ");
798 else {
799 if (stat & READY_STAT) printk("DriveReady ");
800 if (stat & WRERR_STAT) printk("DeviceFault ");
801 if (stat & SEEK_STAT) printk("SeekComplete ");
802 if (stat & DRQ_STAT) printk("DataRequest ");
803 if (stat & ECC_STAT) printk("CorrectedError ");
804 if (stat & INDEX_STAT) printk("Index ");
805 if (stat & ERR_STAT) printk("Error ");
806 }
807 printk("}");
808 }
809 #endif /* FANCY_STATUS_DUMPS */
810 printk("\n");
811 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
812 err = GET_ERR();
813 printk("%s: %s: error=0x%02x", drive->name, msg, err);
814 #if FANCY_STATUS_DUMPS
815 if (drive->media == disk) {
816 printk(" { ");
817 if (err & BBD_ERR) printk("BadSector ");
818 if (err & ECC_ERR) printk("UncorrectableError ");
819 if (err & ID_ERR) printk("SectorIdNotFound ");
820 if (err & ABRT_ERR) printk("DriveStatusError ");
821 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
822 if (err & MARK_ERR) printk("AddrMarkNotFound ");
823 printk("}");
824 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
825 byte cur = IN_BYTE(IDE_SELECT_REG);
826 if (cur & 0x40) { /* using LBA? */
827 printk(", LBAsect=%ld", (unsigned long)
828 ((cur&0xf)<<24)
829 |(IN_BYTE(IDE_HCYL_REG)<<16)
830 |(IN_BYTE(IDE_LCYL_REG)<<8)
831 | IN_BYTE(IDE_SECTOR_REG));
832 } else {
833 printk(", CHS=%d/%d/%d",
834 (IN_BYTE(IDE_HCYL_REG)<<8) +
835 IN_BYTE(IDE_LCYL_REG),
836 cur & 0xf,
837 IN_BYTE(IDE_SECTOR_REG));
838 }
839 if (HWGROUP(drive)->rq)
840 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
841 }
842 }
843 #endif /* FANCY_STATUS_DUMPS */
844 printk("\n");
845 }
846 restore_flags (flags);
847 return err;
848 }
849
850 /*
851 * try_to_flush_leftover_data() is invoked in response to a drive
852 * unexpectedly having its DRQ_STAT bit set. As an alternative to
853 * resetting the drive, this routine tries to clear the condition
854 * by read a sector's worth of data from the drive. Of course,
855 * this may not help if the drive is *waiting* for data from *us*.
856 */
857 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
858 {
859 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
860
861 while (i > 0) {
862 unsigned long buffer[16];
863 unsigned int wcount = (i > 16) ? 16 : i;
864 i -= wcount;
865 ide_input_data (drive, buffer, wcount);
866 }
867 }
868
869 /*
870 * ide_error() takes action based on the error returned by the controller.
871 *
872 * Returns 1 if an ide reset operation has been initiated, in which case
873 * the caller MUST simply return from the driver (through however many levels).
874 * Returns 0 otherwise.
875 */
876 int ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
877 {
878 struct request *rq;
879 byte err;
880
881 err = ide_dump_status(drive, msg, stat);
882 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
883 return 0;
884 if (rq->cmd == IDE_DRIVE_CMD) { /* never retry an explicit DRIVE_CMD */
885 end_drive_cmd(drive, stat, err);
886 return 0;
887 }
888 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
889 rq->errors |= ERROR_RESET;
890 } else {
891 if (drive->media == disk && (stat & ERR_STAT)) {
892 /* err has different meaning on cdrom */
893 if (err & BBD_ERR) /* retries won't help this! */
894 rq->errors = ERROR_MAX;
895 else if (err & TRK0_ERR) /* help it find track zero */
896 rq->errors |= ERROR_RECAL;
897 }
898 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
899 try_to_flush_leftover_data(drive);
900 }
901 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
902 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
903
904 #ifdef CONFIG_BLK_DEV_TRITON
905 if (rq->errors > 3 && drive->using_dma) { /* DMA troubles? */
906 drive->using_dma = 0;
907 printk("%s: DMA disabled\n", drive->name);
908 --rq->errors;
909 return 0;
910 }
911 #endif /* CONFIG_BLK_DEV_TRITON */
912 if (rq->errors >= ERROR_MAX)
913 ide_end_request(0, HWGROUP(drive));
914 else {
915 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
916 ++rq->errors;
917 return ide_do_reset(drive);
918 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
919 drive->special.b.recalibrate = 1;
920 ++rq->errors;
921 }
922 return 0;
923 }
924
925 /*
926 * read_intr() is the handler for disk read/multread interrupts
927 */
928 static void read_intr (ide_drive_t *drive)
/* */
929 {
930 byte stat;
931 int i;
932 unsigned int msect, nsect;
933 struct request *rq;
934
935 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
936 sti();
937 if (!ide_error(drive, "read_intr", stat))
938 IDE_DO_REQUEST;
939 return;
940 }
941 msect = drive->mult_count;
942 read_next:
943 rq = HWGROUP(drive)->rq;
944 if (msect) {
945 if ((nsect = rq->current_nr_sectors) > msect)
946 nsect = msect;
947 msect -= nsect;
948 } else
949 nsect = 1;
950 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
951 #ifdef DEBUG
952 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
953 drive->name, rq->sector, rq->sector+nsect-1,
954 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
955 #endif
956 rq->sector += nsect;
957 rq->buffer += nsect<<9;
958 rq->errors = 0;
959 i = (rq->nr_sectors -= nsect);
960 if ((rq->current_nr_sectors -= nsect) <= 0)
961 ide_end_request(1, HWGROUP(drive));
962 if (i > 0) {
963 if (msect)
964 goto read_next;
965 ide_set_handler (drive, &read_intr);
966 return;
967 }
968 IDE_DO_REQUEST;
969 }
970
971 /*
972 * write_intr() is the handler for disk write interrupts
973 */
974 static void write_intr (ide_drive_t *drive)
/* */
975 {
976 byte stat;
977 int i;
978 struct request *rq = HWGROUP(drive)->rq;
979
980 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
981 #ifdef DEBUG
982 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
983 drive->name, rq->sector, (unsigned long) rq->buffer,
984 rq->nr_sectors-1);
985 #endif
986 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
987 rq->sector++;
988 rq->buffer += 512;
989 rq->errors = 0;
990 i = --rq->nr_sectors;
991 --rq->current_nr_sectors;
992 if (rq->current_nr_sectors <= 0)
993 ide_end_request(1, HWGROUP(drive));
994 if (i > 0) {
995 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
996 ide_set_handler (drive, &write_intr);
997 return;
998 }
999 IDE_DO_REQUEST;
1000 return;
1001 }
1002 }
1003 sti();
1004 if (!ide_error(drive, "write_intr", stat))
1005 IDE_DO_REQUEST;
1006 }
1007
1008 /*
1009 * multwrite() transfers a block of one or more sectors of data to a drive
1010 * as part of a disk multwrite operation.
1011 */
1012 static void multwrite (ide_drive_t *drive)
/* */
1013 {
1014 struct request *rq = &HWGROUP(drive)->wrq;
1015 unsigned int mcount = drive->mult_count;
1016
1017 do {
1018 unsigned int nsect = rq->current_nr_sectors;
1019 if (nsect > mcount)
1020 nsect = mcount;
1021 mcount -= nsect;
1022
1023 ide_output_data(drive, rq->buffer, nsect<<7);
1024 #ifdef DEBUG
1025 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1026 drive->name, rq->sector, (unsigned long) rq->buffer,
1027 nsect, rq->nr_sectors - nsect);
1028 #endif
1029 if ((rq->nr_sectors -= nsect) <= 0)
1030 break;
1031 if ((rq->current_nr_sectors -= nsect) == 0) {
1032 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1033 rq->current_nr_sectors = rq->bh->b_size>>9;
1034 rq->buffer = rq->bh->b_data;
1035 } else {
1036 panic("%s: buffer list corrupted\n", drive->name);
1037 break;
1038 }
1039 } else {
1040 rq->buffer += nsect << 9;
1041 }
1042 } while (mcount);
1043 }
1044
1045 /*
1046 * write_intr() is the handler for disk multwrite interrupts
1047 */
1048 static void multwrite_intr (ide_drive_t *drive)
/* */
1049 {
1050 byte stat;
1051 int i;
1052 struct request *rq = &HWGROUP(drive)->wrq;
1053
1054 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1055 if (stat & DRQ_STAT) {
1056 if (rq->nr_sectors) {
1057 multwrite(drive);
1058 ide_set_handler (drive, &multwrite_intr);
1059 return;
1060 }
1061 } else {
1062 if (!rq->nr_sectors) { /* all done? */
1063 rq = HWGROUP(drive)->rq;
1064 for (i = rq->nr_sectors; i > 0;){
1065 i -= rq->current_nr_sectors;
1066 ide_end_request(1, HWGROUP(drive));
1067 }
1068 IDE_DO_REQUEST;
1069 return;
1070 }
1071 }
1072 }
1073 sti();
1074 if (!ide_error(drive, "multwrite_intr", stat))
1075 IDE_DO_REQUEST;
1076 }
1077
1078 /*
1079 * Issue a simple drive command
1080 * The drive must be selected beforehand.
1081 */
1082 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1083 {
1084 ide_set_handler (drive, handler);
1085 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1086 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1087 OUT_BYTE(cmd,IDE_COMMAND_REG);
1088 }
1089
1090 /*
1091 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1092 */
1093 static void set_multmode_intr (ide_drive_t *drive)
/* */
1094 {
1095 byte stat = GET_STAT();
1096
1097 sti();
1098 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1099 drive->mult_count = drive->mult_req;
1100 } else {
1101 drive->mult_req = drive->mult_count = 0;
1102 drive->special.b.recalibrate = 1;
1103 (void) ide_dump_status(drive, "set_multmode", stat);
1104 }
1105 IDE_DO_REQUEST;
1106 }
1107
1108 /*
1109 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1110 */
1111 static void set_geometry_intr (ide_drive_t *drive)
/* */
1112 {
1113 byte stat = GET_STAT();
1114
1115 sti();
1116 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1117 if (ide_error(drive, "set_geometry_intr", stat))
1118 return;
1119 IDE_DO_REQUEST;
1120 }
1121
1122 /*
1123 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1124 */
1125 static void recal_intr (ide_drive_t *drive)
/* */
1126 {
1127 byte stat = GET_STAT();
1128
1129 sti();
1130 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1131 if (ide_error(drive, "recal_intr", stat))
1132 return;
1133 IDE_DO_REQUEST;
1134 }
1135
1136 /*
1137 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1138 */
1139 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1140 {
1141 byte stat = GET_STAT();
1142
1143 sti();
1144 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1145 end_drive_cmd (drive, stat, GET_ERR());
1146 else if (ide_error(drive, "drive_cmd", stat)) /* calls end_drive_cmd */
1147 return;
1148 IDE_DO_REQUEST;
1149 }
1150
1151 /*
1152 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1153 * commands to a drive. It used to do much more, but has been scaled back
1154 * in recent updates, and could be completely eliminated with a bit more effort.
1155 */
1156 static inline void do_special (ide_drive_t *drive)
/* */
1157 {
1158 special_t *s = &drive->special;
1159 #ifdef DEBUG
1160 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1161 #endif
1162 if (s->b.set_geometry) {
1163 s->b.set_geometry = 0;
1164 if (drive->media == disk) {
1165 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1166 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1167 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1168 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1169 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1170 }
1171 } else if (s->b.recalibrate) {
1172 s->b.recalibrate = 0;
1173 if (drive->media == disk) {
1174 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1175 }
1176 } else if (s->b.set_multmode) {
1177 s->b.set_multmode = 0;
1178 if (drive->media == disk) {
1179 if (drive->id && drive->mult_req > drive->id->max_multsect)
1180 drive->mult_req = drive->id->max_multsect;
1181 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1182 } else
1183 drive->mult_req = 0;
1184 } else if (s->all) {
1185 s->all = 0;
1186 printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1187 }
1188 }
1189
1190 /*
1191 * This routine busy-waits for the drive status to be not "busy".
1192 * It then checks the status for all of the "good" bits and none
1193 * of the "bad" bits, and if all is okay it returns 0. All other
1194 * cases return 1 after invoking ide_error()
1195 *
1196 * This routine should get fixed to not hog the cpu during extra long waits..
1197 * That could be done by busy-waiting for the first jiffy or two, and then
1198 * setting a timer to wake up at half second intervals thereafter,
1199 * until WAIT_WORSTCASE is achieved, before timing out.
1200 */
1201 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1202 {
1203 byte stat;
1204 unsigned long flags;
1205 test:
1206 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1207 if (OK_STAT((stat = GET_STAT()), good, bad))
1208 return 0; /* fast exit for most frequent case */
1209 if (!(stat & BUSY_STAT)) {
1210 (void) ide_error(drive, "status error", stat);
1211 return 1;
1212 }
1213
1214 save_flags(flags);
1215 sti();
1216 timeout += jiffies;
1217 do {
1218 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1219 restore_flags(flags);
1220 goto test;
1221 }
1222 } while (jiffies <= timeout);
1223
1224 restore_flags(flags);
1225 (void) ide_error(drive, "status timeout", GET_STAT());
1226 return 1;
1227 }
1228
1229 /*
1230 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1231 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1232 * care of issuing special DRIVE_CMDs.
1233 */
1234 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1235 {
1236 unsigned short io_base = HWIF(drive)->io_base;
1237
1238 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1239 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1240 if (drive->select.b.lba) {
1241 #ifdef DEBUG
1242 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1243 drive->name, (rq->cmd==READ)?"read":"writ",
1244 block, rq->nr_sectors, (unsigned long) rq->buffer);
1245 #endif
1246 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1247 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1248 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1249 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1250 } else {
1251 unsigned int sect,head,cyl,track;
1252 track = block / drive->sect;
1253 sect = block % drive->sect + 1;
1254 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1255 head = track % drive->head;
1256 cyl = track / drive->head;
1257 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1258 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1259 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1260 #ifdef DEBUG
1261 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1262 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1263 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1264 #endif
1265 }
1266 if (rq->cmd == READ) {
1267 #ifdef CONFIG_BLK_DEV_TRITON
1268 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1269 return;
1270 #endif /* CONFIG_BLK_DEV_TRITON */
1271 ide_set_handler(drive, &read_intr);
1272 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1273 return;
1274 }
1275 if (rq->cmd == WRITE) {
1276 #ifdef CONFIG_BLK_DEV_TRITON
1277 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1278 return;
1279 #endif /* CONFIG_BLK_DEV_TRITON */
1280 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1281 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1282 printk("%s: no DRQ after issuing %s\n", drive->name,
1283 drive->mult_count ? "MULTWRITE" : "WRITE");
1284 return;
1285 }
1286 if (!drive->unmask)
1287 cli();
1288 if (drive->mult_count) {
1289 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1290 ide_set_handler (drive, &multwrite_intr);
1291 multwrite(drive);
1292 } else {
1293 ide_set_handler (drive, &write_intr);
1294 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1295 }
1296 return;
1297 }
1298 if (rq->cmd == IDE_DRIVE_CMD) {
1299 byte *args = rq->buffer;
1300 if (args) {
1301 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1302 drive->name, args[0], args[1], args[2]);
1303 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1304 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1305 return;
1306 } else {
1307 /*
1308 * NULL is actually a valid way of waiting for
1309 * all current requests to be flushed from the queue.
1310 */
1311 #ifdef DEBUG
1312 printk("%s: DRIVE_CMD (null)\n", drive->name);
1313 #endif
1314 end_drive_cmd(drive, GET_STAT(), GET_ERR());
1315 return;
1316 }
1317 }
1318 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1319 ide_end_request(0, HWGROUP(drive));
1320 }
1321
1322 /*
1323 * do_request() initiates handling of a new I/O request
1324 */
1325 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1326 {
1327 unsigned int minor, unit;
1328 unsigned long block, blockend;
1329 ide_drive_t *drive;
1330
1331 sti();
1332 #ifdef DEBUG
1333 printk("%s: ide_do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1334 #endif
1335 minor = MINOR(rq->rq_dev);
1336 unit = minor >> PARTN_BITS;
1337 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1338 printk("%s: bad device number: %s\n",
1339 hwif->name, kdevname(rq->rq_dev));
1340 goto kill_rq;
1341 }
1342 drive = &hwif->drives[unit];
1343 #ifdef DEBUG
1344 if (rq->bh && !buffer_locked(rq->bh)) {
1345 printk("%s: block not locked\n", drive->name);
1346 goto kill_rq;
1347 }
1348 #endif
1349 block = rq->sector;
1350 blockend = block + rq->nr_sectors;
1351 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1352 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1353 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1354 goto kill_rq;
1355 }
1356 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1357 #if FAKE_FDISK_FOR_EZDRIVE
1358 if (block == 0 && drive->ezdrive) {
1359 block = 1;
1360 printk("%s: [EZD] accessing sector 1 instead of sector 0\n", drive->name);
1361 }
1362 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1363 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1364 #if (DISK_RECOVERY_TIME > 0)
1365 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1366 #endif
1367 #if SUPPORT_HT6560B
1368 if (hwif->select)
1369 ide_hwif_select (hwif);
1370 #endif
1371 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1372 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1373 printk("%s: drive not ready for command\n", drive->name);
1374 return;
1375
1376 }
1377 if (!drive->special.all) {
1378 #ifdef CONFIG_BLK_DEV_IDECD
1379 switch (drive->media) {
1380 case disk:
1381 do_rw_disk (drive, rq, block);
1382 return;
1383 case cdrom:
1384 ide_do_rw_cdrom (drive, block);
1385 return;
1386 default:
1387 printk("%s: media type %d not supported\n",
1388 drive->name, drive->media);
1389 goto kill_rq;
1390 }
1391 #else
1392 do_rw_disk (drive, rq, block); /* simpler and faster */
1393 return;
1394 #endif;
1395 }
1396 do_special(drive);
1397 return;
1398 kill_rq:
1399 ide_end_request(0, hwif->hwgroup);
1400 }
1401
1402 /*
1403 * The driver enables interrupts as much as possible. In order to do this,
1404 * (a) the device-interrupt is always masked before entry, and
1405 * (b) the timeout-interrupt is always disabled before entry.
1406 *
1407 * If we enter here from, say irq14, and then start a new request for irq15,
1408 * (possible with "serialize" option) then we cannot ensure that we exit
1409 * before the irq15 hits us. So, we must be careful not to let this bother us.
1410 *
1411 * Interrupts are still masked (by default) whenever we are exchanging
1412 * data/cmds with a drive, because some drives seem to have very poor
1413 * tolerance for latency during I/O. For devices which don't suffer from
1414 * this problem (most don't), the unmask flag can be set using the "hdparm"
1415 * utility, to permit other interrupts during data/cmd transfers.
1416 */
1417 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1418 {
1419 cli(); /* paranoia */
1420 if (hwgroup->handler != NULL) {
1421 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1422 return;
1423 }
1424 do {
1425 ide_hwif_t *hwif = hwgroup->hwif;
1426 struct request *rq;
1427 if ((rq = hwgroup->rq) == NULL) {
1428 hwgroup->drive = NULL; /* paranoia */
1429 do {
1430 rq = blk_dev[hwif->major].current_request;
1431 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1432 goto got_rq;
1433 } while ((hwif = hwif->next) != hwgroup->hwif);
1434 return; /* no work left for this hwgroup */
1435 got_rq:
1436 blk_dev[hwif->major].current_request = rq->next;
1437 }
1438 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1439 cli();
1440 } while (hwgroup->handler == NULL);
1441 }
1442
1443 /*
1444 * do_hwgroup_request() invokes ide_do_request() after first masking
1445 * all possible interrupts for the current hwgroup. This prevents race
1446 * conditions in the event that an unexpected interrupt occurs while
1447 * we are in the driver.
1448 *
1449 * Note that when an interrupt is used to reenter the driver, the first level
1450 * handler will already have masked the irq that triggered, but any other ones
1451 * for the hwgroup will still be unmasked. The driver tries to be careful
1452 * about such things.
1453 */
1454 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1455 {
1456 if (hwgroup->handler == NULL) {
1457 ide_hwif_t *hgif = hwgroup->hwif;
1458 ide_hwif_t *hwif = hgif;
1459 do {
1460 disable_irq(hwif->irq);
1461 } while ((hwif = hwif->next) != hgif);
1462 ide_do_request (hwgroup);
1463 do {
1464 enable_irq(hwif->irq);
1465 } while ((hwif = hwif->next) != hgif);
1466 }
1467 }
1468
1469 static void do_ide0_request (void) /* invoked with cli() */
/* */
1470 {
1471 do_hwgroup_request (ide_hwifs[0].hwgroup);
1472 }
1473
1474 static void do_ide1_request (void) /* invoked with cli() */
/* */
1475 {
1476 do_hwgroup_request (ide_hwifs[1].hwgroup);
1477 }
1478
1479 static void do_ide2_request (void) /* invoked with cli() */
/* */
1480 {
1481 do_hwgroup_request (ide_hwifs[2].hwgroup);
1482 }
1483
1484 static void do_ide3_request (void) /* invoked with cli() */
/* */
1485 {
1486 do_hwgroup_request (ide_hwifs[3].hwgroup);
1487 }
1488
1489 static void timer_expiry (unsigned long data)
/* */
1490 {
1491 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1492 ide_drive_t *drive = hwgroup->drive;
1493 unsigned long flags;
1494
1495 save_flags(flags);
1496 cli();
1497
1498 if (hwgroup->reset_timeout != 0) { /* ide reset in progress? */
1499 if (!reset_handler(hwgroup))
1500 do_hwgroup_request (hwgroup);
1501 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1502 sti(); /* drive must have responded just as the timer expired */
1503 printk("%s: marginal timeout\n", drive->name);
1504 } else { /* drive not responding */
1505 hwgroup->handler = NULL;
1506 if (hwgroup->hwif->dmaproc)
1507 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1508 if (!ide_error(drive, "irq timeout", GET_STAT()))
1509 do_hwgroup_request (hwgroup);
1510 }
1511 restore_flags(flags);
1512 }
1513
1514 /*
1515 * There's nothing really useful we can do with an unexpected interrupt,
1516 * other than reading the status register (to clear it), and logging it.
1517 * There should be no way that an irq can happen before we're ready for it,
1518 * so we needn't worry much about losing an "important" interrupt here.
1519 *
1520 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1521 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1522 * "good", we just ignore the interrupt completely.
1523 *
1524 * This routine assumes cli() is in effect when called.
1525 *
1526 * If an unexpected interrupt happens on irq15 while we are handling irq14
1527 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1528 * we could screw up by interfering with a new request being set up for irq15.
1529 *
1530 * In reality, this is a non-issue. The new command is not sent unless the
1531 * drive is ready to accept one, in which case we know the drive is not
1532 * trying to interrupt us. And ide_set_handler() is always invoked before
1533 * completing the issuance of any new drive command, so we will not be
1534 * accidently invoked as a result of any valid command completion interrupt.
1535 *
1536 */
1537 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1538 {
1539 byte stat;
1540 unsigned int unit;
1541 ide_hwif_t *hwif = hwgroup->hwif;
1542
1543 /*
1544 * check for ide reset in progress
1545 */
1546 if (hwgroup->reset_timeout != 0) {
1547 if (!reset_handler(hwgroup))
1548 do_hwgroup_request (hwgroup);
1549 return;
1550 }
1551
1552 /*
1553 * handle the unexpected interrupt
1554 */
1555 do {
1556 if (hwif->irq == irq) {
1557 #if SUPPORT_HT6560B
1558 if (hwif->select)
1559 ide_hwif_select (hwif);
1560 #endif
1561 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1562 ide_drive_t *drive = &hwif->drives[unit];
1563 if (!drive->present)
1564 continue;
1565 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1566 (void) ide_dump_status(drive, "unexpected_intr", stat);
1567 if ((stat & DRQ_STAT))
1568 try_to_flush_leftover_data(drive);
1569 }
1570 }
1571 } while ((hwif = hwif->next) != hwgroup->hwif);
1572 }
1573
1574 /*
1575 * entry point for all interrupts, caller does cli() for us
1576 */
1577 static void ide_intr (int irq, struct pt_regs *regs)
/* */
1578 {
1579 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1580 ide_handler_t *handler;
1581
1582 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1583 ide_drive_t *drive = hwgroup->drive;
1584 hwgroup->handler = NULL;
1585 del_timer(&(hwgroup->timer));
1586 if (drive->unmask)
1587 sti();
1588 handler(drive);
1589 } else {
1590 unexpected_intr(irq, hwgroup);
1591 }
1592 cli();
1593 }
1594
1595 /*
1596 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1597 * It returns NULL if the given device number does not match any present drives.
1598 */
1599 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1600 {
1601 int major = MAJOR(i_rdev);
1602 unsigned int h;
1603
1604 for (h = 0; h < MAX_HWIFS; ++h) {
1605 ide_hwif_t *hwif = &ide_hwifs[h];
1606 if (hwif->present && major == hwif->major) {
1607 unsigned unit = DEVICE_NR(i_rdev);
1608 if (unit < MAX_DRIVES) {
1609 ide_drive_t *drive = &hwif->drives[unit];
1610 if (drive->present)
1611 return drive;
1612 } else if (major == IDE0_MAJOR && unit < 4) {
1613 printk("ide: probable bad entry for /dev/hd%c%d\n",
1614 'a' + unit, MINOR(i_rdev) & PARTN_MASK);
1615 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1616 }
1617 break;
1618 }
1619 }
1620 return NULL;
1621 }
1622
1623 /*
1624 * This function issues a specific IDE drive command onto the
1625 * tail of the request queue, and waits for it to be completed.
1626 * If arg is NULL, it goes through all the motions,
1627 * but without actually sending a command to the drive.
1628 */
1629 int ide_do_drive_cmd(kdev_t rdev, char *args)
/* */
1630 {
1631 unsigned long flags;
1632 unsigned int major = MAJOR(rdev);
1633 struct request rq, *cur_rq;
1634 struct blk_dev_struct *bdev;
1635 struct semaphore sem = MUTEX_LOCKED;
1636
1637 /* build up a special request, and add it to the queue */
1638 rq.buffer = args;
1639 rq.cmd = IDE_DRIVE_CMD;
1640 rq.errors = 0;
1641 rq.sector = 0;
1642 rq.nr_sectors = 0;
1643 rq.current_nr_sectors = 0;
1644 rq.sem = &sem;
1645 rq.bh = NULL;
1646 rq.bhtail = NULL;
1647 rq.next = NULL;
1648 rq.rq_status = RQ_ACTIVE;
1649 rq.rq_dev = rdev;
1650 bdev = &blk_dev[major];
1651
1652 save_flags(flags);
1653 cli();
1654 cur_rq = bdev->current_request;
1655 if (cur_rq == NULL) { /* empty request list? */
1656 bdev->current_request = &rq; /* service ours immediately */
1657 bdev->request_fn();
1658 } else {
1659 while (cur_rq->next != NULL) /* find end of request list */
1660 cur_rq = cur_rq->next;
1661 cur_rq->next = &rq; /* add rq to the end */
1662 }
1663
1664 down(&sem); /* wait for it to be serviced */
1665 restore_flags(flags);
1666 return rq.errors ? -EIO : 0; /* return -EIO if errors */
1667 }
1668
1669 static int ide_open(struct inode * inode, struct file * filp)
/* */
1670 {
1671 ide_drive_t *drive;
1672 unsigned long flags;
1673
1674 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1675 return -ENODEV;
1676 save_flags(flags);
1677 cli();
1678 while (drive->busy)
1679 sleep_on(&drive->wqueue);
1680 drive->usage++;
1681 restore_flags(flags);
1682 #ifdef CONFIG_BLK_DEV_IDECD
1683 if (drive->media == cdrom)
1684 return ide_cdrom_open (inode, filp, drive);
1685 #endif /* CONFIG_BLK_DEV_IDECD */
1686 if (drive->removeable) {
1687 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1688 check_disk_change(inode->i_rdev);
1689 ide_do_drive_cmd(inode->i_rdev, door_lock);
1690 }
1691 return 0;
1692 }
1693
1694 /*
1695 * Releasing a block device means we sync() it, so that it can safely
1696 * be forgotten about...
1697 */
1698 static void ide_release(struct inode * inode, struct file * file)
/* */
1699 {
1700 ide_drive_t *drive;
1701
1702 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1703 sync_dev(inode->i_rdev);
1704 drive->usage--;
1705 #ifdef CONFIG_BLK_DEV_IDECD
1706 if (drive->media == cdrom)
1707 ide_cdrom_release (inode, file, drive);
1708 else
1709 #endif /* CONFIG_BLK_DEV_IDECD */
1710 if (drive->removeable) {
1711 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1712 invalidate_buffers(inode->i_rdev);
1713 ide_do_drive_cmd(inode->i_rdev, door_unlock);
1714 }
1715 }
1716 }
1717
1718 /*
1719 * This routine is called to flush all partitions and partition tables
1720 * for a changed disk, and then re-read the new partition table.
1721 * If we are revalidating a disk because of a media change, then we
1722 * enter with usage == 0. If we are using an ioctl, we automatically have
1723 * usage == 1 (we need an open channel to use an ioctl :-), so this
1724 * is our limit.
1725 */
1726 static int revalidate_disk(kdev_t i_rdev)
/* */
1727 {
1728 ide_drive_t *drive;
1729 unsigned int p, major, minor;
1730 long flags;
1731
1732 if ((drive = get_info_ptr(i_rdev)) == NULL)
1733 return -ENODEV;
1734
1735 major = MAJOR(i_rdev);
1736 minor = drive->select.b.unit << PARTN_BITS;
1737 save_flags(flags);
1738 cli();
1739 if (drive->busy || (drive->usage > 1)) {
1740 restore_flags(flags);
1741 return -EBUSY;
1742 };
1743 drive->busy = 1;
1744 restore_flags(flags);
1745
1746 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1747 if (drive->part[p].nr_sects > 0) {
1748 kdev_t devp = MKDEV(major, minor+p);
1749 sync_dev (devp);
1750 invalidate_inodes (devp);
1751 invalidate_buffers (devp);
1752 }
1753 drive->part[p].start_sect = 0;
1754 drive->part[p].nr_sects = 0;
1755 };
1756
1757 drive->part[0].nr_sects = current_capacity(drive);
1758 if (drive->media == disk)
1759 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1760
1761 drive->busy = 0;
1762 wake_up(&drive->wqueue);
1763 return 0;
1764 }
1765
1766 static int write_fs_long (unsigned long useraddr, long value)
/* */
1767 {
1768 int err;
1769
1770 if (NULL == (long *)useraddr)
1771 return -EINVAL;
1772 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1773 return err;
1774 put_user((unsigned)value, (long *) useraddr);
1775 return 0;
1776 }
1777
1778 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1779 unsigned int cmd, unsigned long arg)
1780 {
1781 struct hd_geometry *loc = (struct hd_geometry *) arg;
1782 int err;
1783 ide_drive_t *drive;
1784 unsigned long flags;
1785
1786 if (!inode || !(inode->i_rdev))
1787 return -EINVAL;
1788 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1789 return -ENODEV;
1790 switch (cmd) {
1791 case HDIO_GETGEO:
1792 if (!loc || drive->media != disk) return -EINVAL;
1793 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1794 if (err) return err;
1795 put_user(drive->bios_head, (byte *) &loc->heads);
1796 put_user(drive->bios_sect, (byte *) &loc->sectors);
1797 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1798 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1799 (unsigned long *) &loc->start);
1800 return 0;
1801
1802 case BLKFLSBUF:
1803 if(!suser()) return -EACCES;
1804 fsync_dev(inode->i_rdev);
1805 invalidate_buffers(inode->i_rdev);
1806 return 0;
1807
1808 case BLKRASET:
1809 if(!suser()) return -EACCES;
1810 if(arg > 0xff) return -EINVAL;
1811 read_ahead[MAJOR(inode->i_rdev)] = arg;
1812 return 0;
1813
1814 case BLKRAGET:
1815 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1816
1817 case BLKGETSIZE: /* Return device size */
1818 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1819 case BLKRRPART: /* Re-read partition tables */
1820 return revalidate_disk(inode->i_rdev);
1821
1822 case HDIO_GET_KEEPSETTINGS:
1823 return write_fs_long(arg, drive->keep_settings);
1824
1825 case HDIO_GET_UNMASKINTR:
1826 return write_fs_long(arg, drive->unmask);
1827
1828 case HDIO_GET_DMA:
1829 return write_fs_long(arg, drive->using_dma);
1830
1831 case HDIO_GET_CHIPSET:
1832 return write_fs_long(arg, drive->chipset);
1833
1834 case HDIO_GET_MULTCOUNT:
1835 return write_fs_long(arg, drive->mult_count);
1836
1837 case HDIO_GET_IDENTITY:
1838 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1839 return -EINVAL;
1840 if (drive->id == NULL)
1841 return -ENOMSG;
1842 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1843 if (!err)
1844 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1845 return err;
1846
1847 case HDIO_GET_NOWERR:
1848 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1849
1850 case HDIO_SET_DMA:
1851 if (drive->media != disk)
1852 return -EPERM;
1853 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1854 return -EPERM;
1855 case HDIO_SET_KEEPSETTINGS:
1856 case HDIO_SET_UNMASKINTR:
1857 case HDIO_SET_NOWERR:
1858 if (arg > 1)
1859 return -EINVAL;
1860 case HDIO_SET_CHIPSET:
1861 if (!suser())
1862 return -EACCES;
1863 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1864 return -EINVAL;
1865 save_flags(flags);
1866 cli();
1867 switch (cmd) {
1868 case HDIO_SET_DMA:
1869 if (!(HWIF(drive)->dmaproc)) {
1870 restore_flags(flags);
1871 return -EPERM;
1872 }
1873 drive->using_dma = arg;
1874 break;
1875 case HDIO_SET_KEEPSETTINGS:
1876 drive->keep_settings = arg;
1877 break;
1878 case HDIO_SET_UNMASKINTR:
1879 if (arg && disallow_unmask) {
1880 restore_flags(flags);
1881 return -EPERM;
1882 }
1883 drive->unmask = arg;
1884 break;
1885 case HDIO_SET_NOWERR:
1886 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1887 break;
1888 case HDIO_SET_CHIPSET:
1889 drive->chipset = arg;
1890 drive->vlb_32bit = (arg & 1);
1891 drive->vlb_sync = (arg & 2) >> 1;
1892 #ifndef VLB_SYNC
1893 if (drive->vlb_sync)
1894 printk("%s: VLB_SYNC not supported by this kernel\n", drive->name);
1895 #endif
1896 break;
1897 }
1898 restore_flags(flags);
1899 return 0;
1900
1901 case HDIO_SET_MULTCOUNT:
1902 if (!suser())
1903 return -EACCES;
1904 if (MINOR(inode->i_rdev) & PARTN_MASK)
1905 return -EINVAL;
1906 if ((drive->id != NULL) && (arg > drive->id->max_multsect))
1907 return -EINVAL;
1908 save_flags(flags);
1909 cli();
1910 if (drive->special.b.set_multmode) {
1911 restore_flags(flags);
1912 return -EBUSY;
1913 }
1914 drive->mult_req = arg;
1915 drive->special.b.set_multmode = 1;
1916 restore_flags(flags);
1917 ide_do_drive_cmd (inode->i_rdev, NULL);
1918 return (drive->mult_count == arg) ? 0 : -EIO;
1919
1920 case HDIO_DRIVE_CMD:
1921 {
1922 unsigned long args;
1923
1924 if (NULL == (long *) arg)
1925 err = ide_do_drive_cmd(inode->i_rdev,NULL);
1926 else {
1927 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1928 {
1929 args = get_user((long *)arg);
1930 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1931 err = ide_do_drive_cmd(inode->i_rdev,(char *)&args);
1932 put_user(args,(long *)arg);
1933 }
1934 }
1935 }
1936 return err;
1937 }
1938
1939 RO_IOCTLS(inode->i_rdev, arg);
1940
1941 default:
1942 #ifdef CONFIG_BLK_DEV_IDECD
1943 if (drive->media == cdrom)
1944 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
1945 #endif /* CONFIG_BLK_DEV_IDECD */
1946 return -EPERM;
1947 }
1948 }
1949
1950 static int ide_check_media_change (kdev_t i_rdev)
/* */
1951 {
1952 ide_drive_t *drive;
1953
1954 if ((drive = get_info_ptr(i_rdev)) == NULL)
1955 return -ENODEV;
1956 #ifdef CONFIG_BLK_DEV_IDECD
1957 if (drive->media == cdrom)
1958 return ide_cdrom_check_media_change (drive);
1959 #endif /* CONFIG_BLK_DEV_IDECD */
1960 if (drive->removeable) /* for disks */
1961 return 1; /* always assume it was changed */
1962 return 0;
1963 }
1964
1965 static void fixstring (byte *s, const int bytecount, const int byteswap)
/* */
1966 {
1967 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
1968
1969 if (byteswap) {
1970 /* convert from big-endian to host byte order */
1971 for (p = end ; p != s;) {
1972 unsigned short *pp = (unsigned short *) (p -= 2);
1973 *pp = ntohs(*pp);
1974 }
1975 }
1976
1977 /* strip leading blanks */
1978 while (s != end && *s == ' ')
1979 ++s;
1980
1981 /* compress internal blanks and strip trailing blanks */
1982 while (s != end && *s) {
1983 if (*s++ != ' ' || (s != end && *s && *s != ' '))
1984 *p++ = *(s-1);
1985 }
1986
1987 /* wipe out trailing garbage */
1988 while (p != end)
1989 *p++ = '\0';
1990 }
1991
1992 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
1993 {
1994 int bswap;
1995 struct hd_driveid *id;
1996 unsigned long capacity, check;
1997
1998 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
1999 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2000 sti();
2001
2002 /*
2003 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2004 */
2005 if ((id->model[0] == 'P' && id->model[1] == 'M')
2006 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2007 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2008 drive->present = 0;
2009 return;
2010 }
2011
2012 /*
2013 * WIN_IDENTIFY returns little-endian info,
2014 * WIN_PIDENTIFY *usually* returns little-endian info.
2015 */
2016 bswap = 1;
2017 if (cmd == WIN_PIDENTIFY) {
2018 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2019 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2020 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2021 bswap = 0; /* Vertos drives may still be weird */
2022 }
2023 fixstring (id->model, sizeof(id->model), bswap);
2024 fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2025 fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2026
2027 /*
2028 * Check for an ATAPI device
2029 */
2030 if (cmd == WIN_PIDENTIFY) {
2031 #ifdef CONFIG_BLK_DEV_IDECD
2032 byte type = (id->config >> 8) & 0x0f;
2033 #endif /* CONFIG_BLK_DEV_IDECD */
2034 printk("%s: %s, ATAPI, ", drive->name, id->model);
2035 drive->media = cdrom;
2036 #ifdef CONFIG_BLK_DEV_IDECD
2037 if (type == 0 || type == 5)
2038 printk("CDROM drive\n");
2039 else
2040 printk("UNKNOWN device\n");
2041 drive->present = 1;
2042 drive->removeable = 1;
2043 #else
2044 printk("not supported by this kernel\n");
2045 #endif /* CONFIG_BLK_DEV_IDECD */
2046 return;
2047 }
2048
2049 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2050 if (id->config & (1<<7)) { /* removeable disk ? */
2051 if (id->model[0] != 'W' || id->model[1] != 'D')
2052 drive->removeable = 1;
2053 }
2054
2055 drive->media = disk;
2056 /* Extract geometry if we did not already have one for the drive */
2057 if (!drive->present) {
2058 drive->present = 1;
2059 drive->cyl = drive->bios_cyl = id->cyls;
2060 drive->head = drive->bios_head = id->heads;
2061 drive->sect = drive->bios_sect = id->sectors;
2062 }
2063 /* Handle logical geometry translation by the drive */
2064 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2065 && (id->cur_heads <= 16) && id->cur_sectors)
2066 {
2067 /*
2068 * Extract the physical drive geometry for our use.
2069 * Note that we purposely do *not* update the bios info.
2070 * This way, programs that use it (like fdisk) will
2071 * still have the same logical view as the BIOS does,
2072 * which keeps the partition table from being screwed.
2073 *
2074 * An exception to this is the cylinder count,
2075 * which we reexamine later on to correct for 1024 limitations.
2076 */
2077 drive->cyl = id->cur_cyls;
2078 drive->head = id->cur_heads;
2079 drive->sect = id->cur_sectors;
2080
2081 /* check for word-swapped "capacity" field in id information */
2082 capacity = drive->cyl * drive->head * drive->sect;
2083 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2084 if (check == capacity) { /* was it swapped? */
2085 /* yes, bring it into little-endian order: */
2086 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2087 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2088 }
2089 }
2090 /* Use physical geometry if what we have still makes no sense */
2091 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2092 drive->cyl = id->cyls;
2093 drive->head = id->heads;
2094 drive->sect = id->sectors;
2095 }
2096 /* Correct the number of cyls if the bios value is too small */
2097 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2098 if (drive->cyl > drive->bios_cyl)
2099 drive->bios_cyl = drive->cyl;
2100 }
2101
2102 (void) current_capacity (drive); /* initialize LBA selection */
2103
2104 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2105 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2106 drive->select.b.lba ? "LBA, " : "",
2107 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2108
2109 drive->mult_count = 0;
2110 if (id->max_multsect) {
2111 drive->mult_req = INITIAL_MULT_COUNT;
2112 if (drive->mult_req > id->max_multsect)
2113 drive->mult_req = id->max_multsect;
2114 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2115 drive->special.b.set_multmode = 1;
2116 }
2117 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2118 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2119 printk(", DMA");
2120 }
2121 printk("\n");
2122 #ifdef SUPPORT_CMD640
2123 cmd640_tune_drive(drive); /* but can we tune a fish? */
2124 #endif
2125 }
2126
2127 /*
2128 * Delay for *at least* 10ms. As we don't know how much time is left
2129 * until the next tick occurs, we wait an extra tick to be safe.
2130 */
2131 static void delay_10ms (void)
/* */
2132 {
2133 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2134 while (timer > jiffies);
2135 }
2136
2137 /*
2138 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2139 * and waits for a response. It also monitors irqs while this is
2140 * happening, in hope of automatically determining which one is
2141 * being used by the interface.
2142 *
2143 * Returns: 0 device was identified
2144 * 1 device timed-out (no response to identify request)
2145 * 2 device aborted the command (refused to identify itself)
2146 */
2147 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2148 {
2149 int hd_status, rc;
2150 unsigned long timeout;
2151 int irqs = 0;
2152
2153 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2154 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2155 irqs = probe_irq_on(); /* start monitoring irqs */
2156 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2157 }
2158
2159 delay_10ms(); /* take a deep breath */
2160 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2161 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2162 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2163 } else
2164 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2165
2166 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2167 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2168 timeout += jiffies;
2169 do {
2170 if (jiffies > timeout) {
2171 if (!HWIF(drive)->irq)
2172 (void) probe_irq_off(irqs);
2173 return 1; /* drive timed-out */
2174 }
2175 delay_10ms(); /* give drive a breather */
2176 } while (IN_BYTE(hd_status) & BUSY_STAT);
2177
2178 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2179 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2180 cli(); /* some systems need this */
2181 do_identify(drive, cmd); /* drive returned ID */
2182 rc = 0; /* success */
2183 } else
2184 rc = 2; /* drive refused ID */
2185 if (!HWIF(drive)->irq) {
2186 irqs = probe_irq_off(irqs); /* get irq number */
2187 if (irqs > 0)
2188 HWIF(drive)->irq = irqs;
2189 else /* Mmmm.. multiple IRQs */
2190 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2191 }
2192 return rc;
2193 }
2194
2195 /*
2196 * do_probe() has the difficult job of finding a drive if it exists,
2197 * without getting hung up if it doesn't exist, without trampling on
2198 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2199 *
2200 * If a drive is "known" to exist (from CMOS or kernel parameters),
2201 * but does not respond right away, the probe will "hang in there"
2202 * for the maximum wait time (about 30 seconds), otherwise it will
2203 * exit much more quickly.
2204 *
2205 * Returns: 0 device was identified
2206 * 1 device timed-out (no response to identify request)
2207 * 2 device aborted the command (refused to identify itself)
2208 * 3 bad status from device (possible for ATAPI drives)
2209 * 4 probe was not attempted because failure was obvious
2210 */
2211 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2212 {
2213 int rc;
2214 #ifdef CONFIG_BLK_DEV_IDECD
2215 if (drive->present) { /* avoid waiting for inappropriate probes */
2216 if ((drive->media == cdrom) && (cmd == WIN_IDENTIFY))
2217 return 4;
2218 }
2219 #endif /* CONFIG_BLK_DEV_IDECD */
2220 #ifdef DEBUG
2221 printk("probing for %s: present=%d, type=%s, probetype=%s\n",
2222 drive->name, drive->present, drive->media ? "cdrom":"disk",
2223 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2224 #endif
2225 #if SUPPORT_HT6560B
2226 if (HWIF(drive)->select)
2227 ide_hwif_select (HWIF(drive));
2228 #endif
2229 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2230 delay_10ms(); /* wait for BUSY_STAT */
2231 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2232 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2233 return 3; /* no i/f present: avoid killing ethernet cards */
2234 }
2235
2236 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2237 || drive->present || cmd == WIN_PIDENTIFY)
2238 {
2239 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2240 rc = try_to_identify(drive,cmd); /* failed: try again */
2241 if (rc == 1)
2242 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2243 (void) GET_STAT(); /* ensure drive irq is clear */
2244 } else {
2245 rc = 3; /* not present or maybe ATAPI */
2246 }
2247 if (drive->select.b.unit != 0) {
2248 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2249 delay_10ms();
2250 (void) GET_STAT(); /* ensure drive irq is clear */
2251 }
2252 return rc;
2253 }
2254
2255 /*
2256 * probe_for_drive() tests for existance of a given drive using do_probe().
2257 *
2258 * Returns: 0 no device was found
2259 * 1 device was found (note: drive->present might still be 0)
2260 */
2261 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2262 {
2263 if (drive->noprobe) /* skip probing? */
2264 return drive->present;
2265 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2266 #ifdef CONFIG_BLK_DEV_IDECD
2267 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2268 #endif /* CONFIG_BLK_DEV_IDECD */
2269 }
2270 if (!drive->present)
2271 return 0; /* drive not found */
2272 if (drive->id == NULL) { /* identification failed? */
2273 if (drive->media == disk) {
2274 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2275 drive->name, drive->cyl, drive->head, drive->sect);
2276 }
2277 #ifdef CONFIG_BLK_DEV_IDECD
2278 else if (drive->media == cdrom) {
2279 printk("%s: ATAPI cdrom (?)\n", drive->name);
2280 }
2281 #endif /* CONFIG_BLK_DEV_IDECD */
2282 else {
2283 drive->present = 0; /* nuke it */
2284 return 1; /* drive was found */
2285 }
2286 }
2287 if (drive->media == disk && !drive->select.b.lba) {
2288 if (!drive->head || drive->head > 16) {
2289 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2290 drive->name, drive->head);
2291 drive->present = 0;
2292 }
2293 }
2294 return 1; /* drive was found */
2295 }
2296
2297 /*
2298 * This routine only knows how to look for drive units 0 and 1
2299 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2300 */
2301 static void probe_for_drives (ide_hwif_t *hwif)
/* */
2302 {
2303 unsigned int unit;
2304
2305 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2306 int msgout = 0;
2307 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2308 ide_drive_t *drive = &hwif->drives[unit];
2309 if (drive->present) {
2310 drive->present = 0;
2311 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2312 msgout = 1;
2313 }
2314 }
2315 if (!msgout)
2316 printk("%s: ports already in use, skipping probe\n", hwif->name);
2317 } else {
2318 unsigned long flags;
2319 save_flags(flags);
2320
2321 #if (MAX_DRIVES > 2)
2322 printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2323 #endif
2324 sti(); /* needed for jiffies and irq probing */
2325 /*
2326 * Second drive should only exist if first drive was found,
2327 * but a lot of cdrom drives seem to be configured as slave-only
2328 */
2329 for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2330 ide_drive_t *drive = &hwif->drives[unit];
2331 (void) probe_for_drive (drive);
2332 }
2333 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2334 ide_drive_t *drive = &hwif->drives[unit];
2335 if (drive->present) {
2336 hwif->present = 1;
2337 request_region(hwif->io_base, 8, hwif->name);
2338 request_region(hwif->ctl_port, 1, hwif->name);
2339 break;
2340 }
2341 }
2342 restore_flags(flags);
2343 }
2344 }
2345
2346 #if SUPPORT_DTC2278
2347 /*
2348 * From: andy@cercle.cts.com (Dyan Wile)
2349 *
2350 * Below is a patch for DTC-2278 - alike software-programmable controllers
2351 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
2352 * the primary (EIDE). You may probably have to enable the 32-bit support to
2353 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
2354 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
2355 * filesystem corrupted with -u1, but under heavy disk load only :-)
2356 *
2357 * From: mlord@bnr.ca -- this chipset is now forced to use the "serialize" feature,
2358 * which hopefully will make it more reliable to use.. maybe it has the same bugs
2359 * as the CMD640B and RZ1000 ??
2360 */
2361
2362 #if SET_DTC2278_MODE4
2363 static void sub22 (char b, char c)
/* */
2364 {
2365 int i;
2366
2367 for(i = 0; i < 3; ++i) {
2368 inb(0x3f6);
2369 outb_p(b,0xb0);
2370 inb(0x3f6);
2371 outb_p(c,0xb4);
2372 inb(0x3f6);
2373 if(inb(0xb4) == c) {
2374 outb_p(7,0xb0);
2375 inb(0x3f6);
2376 return; /* success */
2377 }
2378 }
2379 }
2380 #endif /* SET_DTC2278_MODE4 */
2381
2382 static void init_dtc2278 (void)
/* */
2383 {
2384 unsigned long flags;
2385
2386 save_flags(flags);
2387 cli();
2388 #if SET_DTC2278_MODE4
2389 /*
2390 * This enables PIO mode4 (3?) on the first interface
2391 */
2392 sub22(1,0xc3);
2393 sub22(0,0xa0);
2394 #endif /* SET_DTC2278_MODE4 */
2395 /*
2396 * This enables the second interface
2397 */
2398 outb_p(4,0xb0);
2399 inb(0x3f6);
2400 outb_p(0x20,0xb4);
2401 inb(0x3f6);
2402 restore_flags(flags);
2403 }
2404 #endif /* SUPPORT_DTC2278 */
2405
2406 #ifdef SUPPORT_QD6580
2407 /*
2408 * QDI QD6580 EIDE controller fast support by Colten Edwards.
2409 * no net access but I can be reached at pje120@cs.usask.ca
2410 *
2411 * I suppose that a IOCTL could be used for this and other
2412 * cards like it to modify the speed using hdparm. Someday..
2413 */
2414 static void init_qd6580 (void)
/* */
2415 {
2416 unsigned long flags;
2417
2418 /* looks like 0x4f is fast
2419 * 0x3f is medium
2420 * 0x2f is slower
2421 * 0x1f is slower yet
2422 * ports are 0xb0 0xb2 and 0xb3
2423 */
2424
2425 save_flags(flags);
2426 cli();
2427 outb_p(0x8d,0xb0);
2428 outb_p(0x0 ,0xb2);
2429 outb_p(0x4f,0xb3); /* select "fast" 0x4f */
2430 inb(0x3f6);
2431 restore_flags(flags);
2432 }
2433 #endif /* SUPPORT_QD6580 */
2434
2435 #ifdef SUPPORT_UMC8672
2436 #include "umc8672.c" /* until we tidy up the interface some more */
2437 #endif
2438
2439 #ifdef SUPPORT_CMD640
2440 #include "cmd640.c" /* until we tidy up the interface some more */
2441 #endif
2442
2443 /*
2444 * stridx() returns the offset of c within s,
2445 * or -1 if c is '\0' or not found within s.
2446 */
2447 static int stridx (const char *s, char c)
/* */
2448 {
2449 char *i = strchr(s, c);
2450 return (i && c) ? i - s : -1;
2451 }
2452
2453 /*
2454 * match_parm() does parsing for ide_setup():
2455 *
2456 * 1. the first char of s must be '='.
2457 * 2. if the remainder matches one of the supplied keywords,
2458 * the index (1 based) of the keyword is negated and returned.
2459 * 3. if the remainder is a series of no more than max_vals numbers
2460 * separated by commas, the numbers are saved in vals[] and a
2461 * count of how many were saved is returned. Base10 is assumed,
2462 * and base16 is allowed when prefixed with "0x".
2463 * 4. otherwise, zero is returned.
2464 */
2465 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2466 {
2467 static const char *decimal = "0123456789";
2468 static const char *hex = "0123456789abcdef";
2469 int i, n;
2470
2471 if (*s++ == '=') {
2472 /*
2473 * Try matching against the supplied keywords,
2474 * and return -(index+1) if we match one
2475 */
2476 for (i = 0; *keywords != NULL; ++i) {
2477 if (!strcmp(s, *keywords++))
2478 return -(i+1);
2479 }
2480 /*
2481 * Look for a series of no more than "max_vals"
2482 * numeric values separated by commas, in base10,
2483 * or base16 when prefixed with "0x".
2484 * Return a count of how many were found.
2485 */
2486 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2487 vals[n] = i;
2488 while ((i = stridx(decimal, *++s)) >= 0)
2489 vals[n] = (vals[n] * 10) + i;
2490 if (*s == 'x' && !vals[n]) {
2491 while ((i = stridx(hex, *++s)) >= 0)
2492 vals[n] = (vals[n] * 0x10) + i;
2493 }
2494 if (++n == max_vals)
2495 break;
2496 if (*s == ',')
2497 ++s;
2498 }
2499 if (!*s)
2500 return n;
2501 }
2502 return 0; /* zero = nothing matched */
2503 }
2504
2505 /*
2506 * ide_setup() gets called VERY EARLY during initialization,
2507 * to handle kernel "command line" strings beginning with "hdx="
2508 * or "ide". Here is the complete set currently supported:
2509 *
2510 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2511 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2512 *
2513 * "hdx=noprobe" : drive may be present, but do not probe for it
2514 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2515 * "hdx=cdrom" : drive is present, and is a cdrom drive
2516 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2517 *
2518 * "idex=noprobe" : do not attempt to access/use this interface
2519 * "idex=base" : probe for an interface at the addr specified,
2520 * where "base" is usually 0x1f0 or 0x170
2521 * and "ctl" is assumed to be "base"+0x206
2522 * "idex=base,ctl" : specify both base and ctl
2523 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2524 *
2525 * The following two are valid ONLY on ide0 or ide1,
2526 * and the defaults for the base,ctl ports must not be altered.
2527 *
2528 * "idex=serialize" : do not overlap operations on ide0 and ide1.
2529 * "idex=dtc2278" : enables use of DTC2278 secondary i/f
2530 * "idex=ht6560b" : enables use of HT6560B secondary i/f
2531 * "idex=cmd640_vlb" : required for VLB cards with the CMD640 chip
2532 * (not for PCI -- automatically detected)
2533 *
2534 * This option is valid ONLY on ide0, and the defaults for the base,ctl ports
2535 * must not be altered.
2536 *
2537 * "ide0=qd6580" : select "fast" interface speed on a qd6580 interface
2538 */
2539 void ide_setup (char *s)
/* */
2540 {
2541 int vals[3];
2542 ide_hwif_t *hwif;
2543 ide_drive_t *drive;
2544 unsigned int hw, unit;
2545 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2546 const char max_hwif = '0' + (MAX_HWIFS - 1);
2547
2548 printk("ide_setup: %s", s);
2549 init_ide_data ();
2550
2551 /*
2552 * Look for drive options: "hdx="
2553 */
2554 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2555 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize", NULL};
2556 unit = s[2] - 'a';
2557 hw = unit / MAX_DRIVES;
2558 unit = unit % MAX_DRIVES;
2559 hwif = &ide_hwifs[hw];
2560 drive = &hwif->drives[unit];
2561 switch (match_parm(&s[3], hd_words, vals, 3)) {
2562 case -1: /* "noprobe" */
2563 drive->noprobe = 1;
2564 goto done;
2565 case -2: /* "nowerr" */
2566 drive->bad_wstat = BAD_R_STAT;
2567 hwif->noprobe = 0;
2568 goto done;
2569 case -3: /* "cdrom" */
2570 drive->present = 1;
2571 drive->media = cdrom;
2572 hwif->noprobe = 0;
2573 goto done;
2574 case -4: /* "serialize" */
2575 printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
2576 goto do_serialize;
2577 case 3: /* cyl,head,sect */
2578 drive->media = disk;
2579 drive->cyl = drive->bios_cyl = vals[0];
2580 drive->head = drive->bios_head = vals[1];
2581 drive->sect = drive->bios_sect = vals[2];
2582 drive->present = 1;
2583 hwif->noprobe = 0;
2584 goto done;
2585 default:
2586 goto bad_option;
2587 }
2588 }
2589 /*
2590 * Look for interface options: "idex="
2591 */
2592 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2593 const char *ide_words[] = {"noprobe", "serialize", "dtc2278", "ht6560b",
2594 "cmd640_vlb", "qd6580", "umc8672", NULL};
2595 hw = s[3] - '0';
2596 hwif = &ide_hwifs[hw];
2597
2598 switch (match_parm(&s[4], ide_words, vals, 3)) {
2599 #if SUPPORT_UMC8672
2600 case -7: /* "umc8672" */
2601 if (hw != 0) goto bad_hwif;
2602 init_umc8672();
2603 goto done;
2604 #endif /* SUPPORT_UMC8672 */
2605 #if SUPPORT_QD6580
2606 case -6: /* "qd6580" */
2607 if (hw != 0) goto bad_hwif;
2608 init_qd6580();
2609 goto done;
2610 #endif /* SUPPORT_QD6580 */
2611 #if SUPPORT_CMD640
2612 case -5: /* "cmd640_vlb" */
2613 if (hw > 1) goto bad_hwif;
2614 cmd640_vlb = 1;
2615 break;
2616 #endif /* SUPPORT_CMD640 */
2617 #if SUPPORT_HT6560B
2618 case -4: /* "ht6560b" */
2619 if (hw > 1) goto bad_hwif;
2620 /*
2621 * Using 0x1c and 0x1d apparently selects a
2622 * faster interface speed than 0x3c and 0x3d.
2623 *
2624 * Need to add an ioctl to select between them.
2625 */
2626 if (check_region(0x3e6,1)) {
2627 printk(" -- HT6560 PORT 0x3e6 ALREADY IN USE");
2628 goto done;
2629 }
2630 request_region(0x3e6, 1, hwif->name);
2631 ide_hwifs[0].select = 0x3c;
2632 ide_hwifs[1].select = 0x3d;
2633 goto do_serialize;
2634 #endif /* SUPPORT_HT6560B */
2635 #if SUPPORT_DTC2278
2636 case -3: /* "dtc2278" */
2637 if (hw > 1) goto bad_hwif;
2638 init_dtc2278();
2639 goto do_serialize;
2640 #endif /* SUPPORT_DTC2278 */
2641 case -2: /* "serialize" */
2642 do_serialize:
2643 if (hw > 1) goto bad_hwif;
2644 serialized = 1;
2645 goto done;
2646 case -1: /* "noprobe" */
2647 hwif->noprobe = 1;
2648 goto done;
2649 case 1: /* base */
2650 vals[1] = vals[0] + 0x206; /* default ctl */
2651 case 2: /* base,ctl */
2652 vals[2] = 0; /* default irq = probe for it */
2653 case 3: /* base,ctl,irq */
2654 hwif->io_base = vals[0];
2655 hwif->ctl_port = vals[1];
2656 hwif->irq = vals[2];
2657 hwif->noprobe = 0;
2658 goto done;
2659 }
2660 }
2661 bad_option:
2662 printk(" -- BAD OPTION\n");
2663 return;
2664 bad_hwif:
2665 printk("-- NOT SUPPORTED ON ide%d", hw);
2666 done:
2667 printk("\n");
2668 }
2669
2670 /*
2671 * This routine is called from the partition-table code in genhd.c
2672 * to "convert" a drive to a logical geometry with fewer than 1024 cyls
2673 * It mimics the method used by Ontrack Disk Manager.
2674 */
2675 int ide_xlate_1024 (kdev_t i_rdev, int offset, const char *msg)
/* */
2676 {
2677 ide_drive_t *drive;
2678 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2679 const byte *heads = head_vals;
2680 unsigned long tracks;
2681
2682 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->id == NULL)
2683 return 0;
2684
2685 drive->cyl = drive->bios_cyl = drive->id->cyls;
2686 drive->head = drive->bios_head = drive->id->heads;
2687 drive->sect = drive->bios_sect = drive->id->sectors;
2688 drive->special.b.set_geometry = 1;
2689
2690 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2691 drive->bios_sect = 63;
2692 while (drive->bios_cyl >= 1024) {
2693 drive->bios_head = *heads;
2694 drive->bios_cyl = tracks / drive->bios_head;
2695 if (0 == *++heads)
2696 break;
2697 }
2698 if (offset) {
2699 #if FAKE_FDISK_FOR_EZDRIVE
2700 if (offset == -1)
2701 drive->ezdrive = 1;
2702 else
2703 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2704 {
2705 drive->sect0 = 63;
2706 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2707 }
2708 }
2709 drive->part[0].nr_sects = current_capacity(drive);
2710 printk("%s [%d/%d/%d]", msg, drive->bios_cyl, drive->bios_head, drive->bios_sect);
2711 return 1;
2712 }
2713
2714 /*
2715 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2716 * controller that is BIOS compatible with ST-506, and thus showing up in our
2717 * BIOS table, but not register compatible, and therefore not present in CMOS.
2718 *
2719 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2720 * drives in the system -- the ones reflected as drive 1 or 2. The first
2721 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2722 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2723 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2724 * means we have an AT controller hard disk for that drive.
2725 *
2726 * Of course, there is no guarantee that either drive is actually on the
2727 * "primary" IDE interface, but we don't bother trying to sort that out here.
2728 * If a drive is not actually on the primary interface, then these parameters
2729 * will be ignored. This results in the user having to supply the logical
2730 * drive geometry as a boot parameter for each drive not on the primary i/f.
2731 *
2732 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2733 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2734 * for us during initialization. I have the necessary docs -- any takers? -ml
2735 */
2736
2737 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2738 {
2739 #ifdef __i386__
2740 extern struct drive_info_struct drive_info;
2741 byte cmos_disks, *BIOS = (byte *) &drive_info;
2742 int unit;
2743
2744 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2745 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2746 /* Extract drive geometry from CMOS+BIOS if not already setup */
2747 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2748 ide_drive_t *drive = &hwif->drives[unit];
2749 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2750 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2751 drive->head = drive->bios_head = *(BIOS+2);
2752 drive->sect = drive->bios_sect = *(BIOS+14);
2753 drive->ctl = *(BIOS+8);
2754 drive->present = 1;
2755 }
2756 BIOS += 16;
2757 }
2758 #endif
2759 }
2760
2761 /*
2762 * This routine sets up the irq for an ide interface, and creates a new
2763 * hwgroup for the irq/hwif if none was previously assigned.
2764 *
2765 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2766 * interrupts completely disabled. This can be bad for interrupt latency,
2767 * but anything else has led to problems on some machines. We re-enable
2768 * interrupts as much as we can safely do in most places.
2769 */
2770 static int init_irq (ide_hwif_t *hwif)
/* */
2771 {
2772 unsigned long flags;
2773 int irq = hwif->irq;
2774 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
2775
2776 save_flags(flags);
2777 cli();
2778
2779 /*
2780 * Grab the irq if we don't already have it from a previous hwif
2781 */
2782 if (hwgroup == NULL) {
2783 if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2784 restore_flags(flags);
2785 printk(" -- FAILED!");
2786 return 1;
2787 }
2788 }
2789 /*
2790 * Check for serialization with ide1.
2791 * This code depends on us having already taken care of ide1.
2792 */
2793 if (serialized && hwif->name[3] == '0' && ide_hwifs[1].present)
2794 hwgroup = ide_hwifs[1].hwgroup;
2795 /*
2796 * If this is the first interface in a group,
2797 * then we need to create the hwgroup structure
2798 */
2799 if (hwgroup == NULL) {
2800 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2801 hwgroup->hwif = hwif->next = hwif;
2802 hwgroup->rq = NULL;
2803 hwgroup->handler = NULL;
2804 hwgroup->drive = NULL;
2805 hwgroup->reset_timeout = 0;
2806 #ifdef CONFIG_BLK_DEV_IDECD
2807 hwgroup->doing_atapi_reset = 0;
2808 #endif /* CONFIG_BLK_DEV_IDECD */
2809 init_timer(&hwgroup->timer);
2810 hwgroup->timer.function = &timer_expiry;
2811 hwgroup->timer.data = (unsigned long) hwgroup;
2812 } else {
2813 hwif->next = hwgroup->hwif->next;
2814 hwgroup->hwif->next = hwif;
2815 }
2816 hwif->hwgroup = hwgroup;
2817 irq_to_hwgroup[irq] = hwgroup;
2818
2819 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2820
2821 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2822 hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
2823 if (hwgroup->hwif != hwif)
2824 printk(" (serialized with %s)", hwgroup->hwif->name);
2825 printk("\n");
2826 return 0;
2827 }
2828
2829 static struct file_operations ide_fops = {
2830 NULL, /* lseek - default */
2831 block_read, /* read - general block-dev read */
2832 block_write, /* write - general block-dev write */
2833 NULL, /* readdir - bad */
2834 NULL, /* select */
2835 ide_ioctl, /* ioctl */
2836 NULL, /* mmap */
2837 ide_open, /* open */
2838 ide_release, /* release */
2839 block_fsync /* fsync */
2840 ,NULL, /* fasync */
2841 ide_check_media_change, /* check_media_change */
2842 revalidate_disk /* revalidate */
2843 };
2844
2845 #ifdef CONFIG_PCI
2846
2847 void ide_pci_access_error (int rc)
/* */
2848 {
2849 printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
2850 }
2851
2852 #if SUPPORT_RZ1000 || SUPPORT_CMD640
2853 void buggy_interface_fallback (int rc)
/* */
2854 {
2855 ide_pci_access_error (rc);
2856 serialized = 1;
2857 disallow_unmask = 1;
2858 printk("serialized, disabled unmasking\n");
2859 }
2860 #endif /* SUPPORT_RZ1000 || SUPPORT_CMD640 */
2861
2862 #if SUPPORT_RZ1000
2863 void init_rz1000 (byte bus, byte fn)
/* */
2864 {
2865 int rc;
2866 unsigned short reg;
2867
2868 printk("ide: buggy RZ1000 interface: ");
2869 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, ®))) {
2870 ide_pci_access_error (rc);
2871 } else if (!(reg & 1)) {
2872 printk("not enabled\n");
2873 } else {
2874 if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
2875 || (rc = pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
2876 buggy_interface_fallback (rc);
2877 else
2878 printk("disabled read-ahead\n");
2879 }
2880 }
2881 #endif /* SUPPORT_RZ1000 */
2882
2883 typedef void (ide_pci_init_proc_t)(byte, byte);
2884
2885 /*
2886 * ide_probe_pci() scans PCI for a specific vendor/device function,
2887 * and invokes the supplied init routine for each instance detected.
2888 */
2889 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
2890 {
2891 unsigned long flags;
2892 unsigned index;
2893 byte fn, bus;
2894
2895 save_flags(flags);
2896 cli();
2897 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2898 init (bus, fn + func_adj);
2899 }
2900 restore_flags(flags);
2901 }
2902
2903 /*
2904 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2905 *
2906 * This routine should ideally be using pcibios_find_class() to find
2907 * all IDE interfaces, but that function causes some systems to "go weird".
2908 */
2909 static void ide_init_pci (void)
/* */
2910 {
2911 #if SUPPORT_RZ1000
2912 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
2913 #endif
2914 #ifdef CONFIG_BLK_DEV_TRITON
2915 /*
2916 * Apparently the BIOS32 services on Intel motherboards are buggy,
2917 * and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
2918 * So we instead search for PCI_DEVICE_ID_INTEL_82371_0, and then add 1.
2919 */
2920 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
2921 #endif
2922 }
2923 #endif /* CONFIG_PCI */
2924
2925 /*
2926 * This is gets invoked once during initialization, to set *everything* up
2927 */
2928 int ide_init (void)
/* ![[last]](../icons/n_last.png)
*/
2929 {
2930 int h;
2931
2932 init_ide_data ();
2933 /*
2934 * First, we determine what hardware is present
2935 */
2936
2937 #ifdef CONFIG_PCI
2938 /*
2939 * Find/initialize PCI IDE interfaces
2940 */
2941 if (pcibios_present())
2942 ide_init_pci ();
2943 #endif /* CONFIG_PCI */
2944 #ifdef SUPPORT_CMD640
2945 ide_probe_for_cmd640x();
2946 #endif
2947
2948 /*
2949 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
2950 */
2951 for (h = 0; h < MAX_HWIFS; ++h) {
2952 ide_hwif_t *hwif = &ide_hwifs[h];
2953 if (!hwif->noprobe) {
2954 if (hwif->io_base == HD_DATA)
2955 probe_cmos_for_drives (hwif);
2956 probe_for_drives (hwif);
2957 }
2958 if (hwif->present) {
2959 if (!hwif->irq) {
2960 if (!(hwif->irq = default_irqs[h])) {
2961 printk("%s: DISABLED, NO IRQ\n", hwif->name);
2962 hwif->present = 0;
2963 continue;
2964 }
2965 }
2966 #ifdef CONFIG_BLK_DEV_HD
2967 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
2968 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
2969 hwif->present = 0;
2970 }
2971 #endif /* CONFIG_BLK_DEV_HD */
2972 }
2973 }
2974
2975 /*
2976 * Now we try to set up irqs and major devices for what was found
2977 */
2978 for (h = MAX_HWIFS-1; h >= 0; --h) {
2979 void (*rfn)(void);
2980 ide_hwif_t *hwif = &ide_hwifs[h];
2981 if (!hwif->present)
2982 continue;
2983 hwif->present = 0; /* we set it back to 1 if all is ok below */
2984 switch (hwif->major) {
2985 case IDE0_MAJOR: rfn = &do_ide0_request; break;
2986 case IDE1_MAJOR: rfn = &do_ide1_request; break;
2987 case IDE2_MAJOR: rfn = &do_ide2_request; break;
2988 case IDE3_MAJOR: rfn = &do_ide3_request; break;
2989 default:
2990 printk("%s: request_fn NOT DEFINED\n", hwif->name);
2991 continue;
2992 }
2993 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
2994 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
2995 } else if (init_irq (hwif)) {
2996 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
2997 (void) unregister_blkdev (hwif->major, hwif->name);
2998 } else {
2999 init_gendisk(hwif);
3000 blk_dev[hwif->major].request_fn = rfn;
3001 read_ahead[hwif->major] = 8; /* (4kB) */
3002 hwif->present = 1; /* success */
3003 }
3004 }
3005 return 0;
3006 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/