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