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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.14 Sep 14, 1995
3 *
4 * Copyright (C) 1994, 1995 Linus Torvalds & authors (see below)
5 */
6
7 /*
8 * This is the multiple IDE interface driver, as evolved from hd.c.
9 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
10 * There can be up to two drives per interface, as per the ATA-2 spec.
11 *
12 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
13 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
14 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
15 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
16 *
17 * From hd.c:
18 * |
19 * | It traverses the request-list, using interrupts to jump between functions.
20 * | As nearly all functions can be called within interrupts, we may not sleep.
21 * | Special care is recommended. Have Fun!
22 * |
23 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
24 * |
25 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
26 * | in the early extended-partition checks and added DM partitions.
27 * |
28 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
29 * |
30 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
31 * | and general streamlining by Mark Lord (mlord@bnr.ca).
32 *
33 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
34 *
35 * Mark Lord (mlord@bnr.ca) (IDE Perf.Pkg)
36 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
37 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
38 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
39 *
40 * Maintained by Mark Lord (mlord@bnr.ca): ide.c, ide.h, triton.c, hd.c, ..
41 *
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
45 *
46 * Version 1.0 ALPHA initial code, primary i/f working okay
47 * Version 1.3 BETA dual i/f on shared irq tested & working!
48 * Version 1.4 BETA added auto probing for irq(s)
49 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
50 * ...
51 * Version 3.5 correct the bios_cyl field if it's too small
52 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
53 * Version 3.6 cosmetic corrections to comments and stuff
54 * (linux 1.1.77) reorganise probing code to make it understandable
55 * added halfway retry to probing for drive identification
56 * added "hdx=noprobe" command line option
57 * allow setting multmode even when identification fails
58 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
59 * increase DRQ_WAIT to eliminate nuisance messages
60 * wait for DRQ_STAT instead of DATA_READY during probing
61 * (courtesy of Gary Thomas gary@efland.UU.NET)
62 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
63 * update of ide-cd.c from Scott, allows blocksize=1024
64 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
65 * Version 3.9 don't use LBA if lba_capacity looks funny
66 * correct the drive capacity calculations
67 * fix probing for old Seagates without IDE_ALTSTATUS_REG
68 * fix byte-ordering for some NEC cdrom drives
69 * Version 3.10 disable multiple mode by default; was causing trouble
70 * Version 3.11 fix mis-identification of old WD disks as cdroms
71 * Version 3,12 simplify logic for selecting initial mult_count
72 * (fixes problems with buggy WD drives)
73 * Version 3.13 remove excess "multiple mode disabled" messages
74 * Version 3.14 fix ide_error() handling of BUSY_STAT
75 * fix byte-swapped cdrom strings (again.. arghh!)
76 * ignore INDEX bit when checking the ALTSTATUS reg
77 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
78 * ignore WRERR_STAT for non-write operations
79 * added vlb_sync support for DC-2000A & others,
80 * (incl. some Promise chips), courtesy of Frank Gockel
81 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
82 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
83 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
84 * add boot flag to "serialize" operation for CMD i/f
85 * add optional support for DTC2278 interfaces,
86 * courtesy of andy@cercle.cts.com (Dyan Wile).
87 * add boot flag to enable "dtc2278" probe
88 * add probe to avoid EATA (SCSI) interfaces,
89 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
90 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
91 * add flag to ignore WRERR_STAT for some drives
92 * courtesy of David.H.West@um.cc.umich.edu
93 * assembly syntax tweak to vlb_sync
94 * removeable drive support from scuba@cs.tu-berlin.de
95 * add transparent support for DiskManager-6.0x "Dynamic
96 * Disk Overlay" (DDO), most of this in in genhd.c
97 * eliminate "multiple mode turned off" message at boot
98 * Version 4.10 fix bug in ioctl for "hdparm -c3"
99 * fix DM6:DDO support -- now works with LILO, fdisk, ...
100 * don't treat some naughty WD drives as removeable
101 * Version 4.11 updated DM6 support using info provided by OnTrack
102 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
103 * added support for 3rd/4th/alternative IDE ports
104 * created ide.h; ide-cd.c now compiles separate from ide.c
105 * hopefully fixed infinite "unexpected_intr" from cdroms
106 * zillions of other changes and restructuring
107 * somehow reduced overall memory usage by several kB
108 * probably slowed things down slightly, but worth it
109 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
110 * was happening at various times/places: whenever the
111 * ide-interface's ctl_port was used to "mask" the irq,
112 * it also would trigger an edge in the process of masking
113 * which would result in a self-inflicted interrupt!!
114 * (such a stupid way to build a hardware interrupt mask).
115 * This is now fixed (after a year of head-scratching).
116 * Version 5.02 got rid of need for {enable,disable}_irq_list()
117 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
118 * removed PROBE_FOR_IRQS option -- no longer needed
119 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
120 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
121 * added more comments, cleaned up unexpected_intr()
122 * OOOPS! fixed null pointer problem in ide reset code
123 * added autodetect for Triton chipset -- no effect yet
124 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
125 * OOOPS! fixed bug in ide_do_request()
126 * added ATAPI reset sequence for cdroms
127 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
128 * some (mostly) cosmetic changes
129 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
130 * reworked PCI scanning code
131 * added automatic RZ1000 detection/support
132 * added automatic PCI CMD640 detection/support
133 * added option for VLB CMD640 support
134 * tweaked probe to find cdrom on hdb with disks on hda,hdc
135 * Version 5.12 some performance tuning
136 * added message to alert user to bad /dev/hd[cd] entries
137 * OOOPS! fixed bug in atapi reset
138 * driver now forces "serialize" again for all cmd640 chips
139 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
140 * made do_drive_cmd() into public ide_do_drive_cmd()
141 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
142 * fixed ht6560b support
143 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
144 * don't bother invalidating nonexistent partitions
145 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
146 * added & tested full EZ-DRIVE support -- don't use LILO!
147 * don't enable 2nd CMD640 PCI port during init - conflict
148 *
149 * Driver compile-time options are in ide.h
150 *
151 * To do, in likely order of completion:
152 * - add ioctls to get/set interface timings on cmd640, ht6560b, triton
153 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
154 * - improved CMD support: handed this off to someone else
155 * - find someone to work on IDE *tape drive* support
156 */
157
158 #undef REALLY_SLOW_IO /* most systems can safely undef this */
159
160 #include <linux/config.h>
161 #include <linux/types.h>
162 #include <linux/string.h>
163 #include <linux/kernel.h>
164 #include <linux/delay.h>
165 #include <linux/timer.h>
166 #include <linux/mm.h>
167 #include <linux/ioport.h>
168 #include <linux/interrupt.h>
169 #include <linux/major.h>
170 #include <linux/blkdev.h>
171 #include <linux/errno.h>
172 #include <linux/hdreg.h>
173 #include <linux/genhd.h>
174 #include <asm/byteorder.h>
175 #include <asm/irq.h>
176 #include <asm/segment.h>
177 #include <asm/io.h>
178
179 #ifdef CONFIG_PCI
180 #include <linux/bios32.h>
181 #include <linux/pci.h>
182 #endif /* CONFIG_PCI */
183
184 #include "ide.h"
185
186 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* hwif info */
187 static ide_hwgroup_t *irq_to_hwgroup [16];
188 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
189
190 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
191 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
192 static int single_threaded = 0; /* "serialize" option */
193 static int disallow_unmask = 0; /* for buggy hardware */
194
195 #if (DISK_RECOVERY_TIME > 0)
196 /*
197 * For really screwy hardware (hey, at least it *can* be used with Linux)
198 * we can enforce a minimum delay time between successive operations.
199 */
200 static unsigned long read_timer(void)
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201 {
202 unsigned long t, flags;
203 int i;
204
205 save_flags(flags);
206 cli();
207 t = jiffies * 11932;
208 outb_p(0, 0x43);
209 i = inb_p(0x40);
210 i |= inb(0x40) << 8;
211 restore_flags(flags);
212 return (t - i);
213 }
214
215 void ide_set_recovery_timer (ide_hwif_t *hwif)
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*/
216 {
217 hwif->last_time = read_timer();
218 }
219 #endif /* DISK_RECOVERY_TIME */
220
221 /*
222 * init_ide_data() sets reasonable default values into all fields
223 * of all instances of the hwifs and drives, but only on the first call.
224 * Subsequent calls have no effect (they don't wipe out anything).
225 *
226 * This routine is normally called at driver initialization time,
227 * but may also be called MUCH earlier during kernel "command-line"
228 * parameter processing. As such, we cannot depend on any other parts
229 * of the kernel (such as memory allocation) to be functioning yet.
230 *
231 * This is too bad, as otherwise we could dynamically allocate the
232 * ide_drive_t structs as needed, rather than always consuming memory
233 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
234 */
235 #define MAGIC_COOKIE 0x12345678
236 static void init_ide_data (void)
/* */
237 {
238 byte *p;
239 unsigned int h, unit;
240 static unsigned long magic_cookie = MAGIC_COOKIE;
241
242 if (magic_cookie != MAGIC_COOKIE)
243 return; /* already initialized */
244 magic_cookie = 0;
245
246 for (h = 0; h < 16; ++h)
247 irq_to_hwgroup[h] = NULL;
248
249 /* bulk initialize hwif & drive info with zeros */
250 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
251 do {
252 *--p = 0;
253 } while (p > (byte *) ide_hwifs);
254
255 for (h = 0; h < MAX_HWIFS; ++h) {
256 ide_hwif_t *hwif = &ide_hwifs[h];
257
258 /* fill in any non-zero initial values */
259 hwif->noprobe = (h > 1);
260 hwif->io_base = default_io_base[h];
261 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
262 #ifdef CONFIG_BLK_DEV_HD
263 if (hwif->io_base == HD_DATA)
264 hwif->noprobe = 1; /* may be overriden by ide_setup() */
265 #endif /* CONFIG_BLK_DEV_HD */
266 hwif->major = ide_hwif_to_major[h];
267 hwif->name[0] = 'i';
268 hwif->name[1] = 'd';
269 hwif->name[2] = 'e';
270 hwif->name[3] = '0' + h;
271
272 for (unit = 0; unit < MAX_DRIVES; ++unit) {
273 ide_drive_t *drive = &hwif->drives[unit];
274
275 /* fill in any non-zero initial values */
276 drive->select.all = (unit<<4)|0xa0;
277 drive->hwif = hwif;
278 drive->ctl = 0x08;
279 drive->ready_stat = READY_STAT;
280 drive->bad_wstat = BAD_W_STAT;
281 drive->special.b.recalibrate = 1;
282 drive->special.b.set_geometry = 1;
283 drive->name[0] = 'h';
284 drive->name[1] = 'd';
285 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
286 }
287 }
288 }
289
290 #define VLB_SYNC 1
291 /*
292 * Some localbus EIDE interfaces require a special access sequence
293 * when using 32-bit I/O instructions to transfer data. We call this
294 * the "vlb_sync" sequence, which consists of three successive reads
295 * of the sector count register location, with interrupts disabled
296 * to ensure that the reads all happen together.
297 */
298 static inline void do_vlb_sync (unsigned short port) {
/* */
299 (void) inb (port);
300 (void) inb (port);
301 (void) inb (port);
302 }
303
304 /*
305 * This is used for most PIO data transfers *from* the IDE interface
306 */
307 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
308 {
309 unsigned short io_base = HWIF(drive)->io_base;
310 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
311
312 if (drive->vlb_32bit) {
313 #ifdef VLB_SYNC
314 if (drive->vlb_sync) {
315 cli();
316 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
317 insl(data_reg, buffer, wcount);
318 if (drive->unmask)
319 sti();
320 } else
321 #endif /* VLB_SYNC */
322 insl(data_reg, buffer, wcount);
323 } else
324 insw(data_reg, buffer, wcount<<1);
325 }
326
327 /*
328 * This is used for most PIO data transfers *to* the IDE interface
329 */
330 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
331 {
332 unsigned short io_base = HWIF(drive)->io_base;
333 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
334
335 if (drive->vlb_32bit) {
336 #ifdef VLB_SYNC
337 if (drive->vlb_sync) {
338 cli();
339 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
340 outsl(data_reg, buffer, wcount);
341 if (drive->unmask)
342 sti();
343 } else
344 #endif /* VLB_SYNC */
345 outsl(data_reg, buffer, wcount);
346 } else
347 outsw(data_reg, buffer, wcount<<1);
348 }
349
350 #if SUPPORT_HT6560B
351 /*
352 * This routine handles interface switching for the peculiar hardware design
353 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
354 * The HT-6560B can only enable one IDE port at a time, and requires a
355 * silly sequence (below) whenever we switch between primary and secondary.
356 *
357 * Apparently, systems with multiple CMD640 chips may need something similar..
358 *
359 * This algorithm courtesy of malafoss@snakemail.hut.fi
360 */
361
362 void ide_hwif_select (ide_hwif_t *hwif)
/* */
363 {
364 static byte current_select = 0;
365
366 if (hwif->select != current_select) {
367 unsigned long flags;
368 save_flags (flags);
369 cli();
370 current_select = hwif->select;
371 (void) inb(0x3e6);
372 (void) inb(0x3e6);
373 (void) inb(0x3e6);
374 (void) inb(0x3e6);
375 outb(current_select,0x3e6);
376 restore_flags (flags);
377 }
378 }
379 #endif /* SUPPORT_HT6560B */
380
381 /*
382 * This should get invoked any time we exit the driver to
383 * wait for an interrupt response from a drive. handler() points
384 * at the appropriate code to handle the next interrupt, and a
385 * timer is started to prevent us from waiting forever in case
386 * something goes wrong (see the timer_expiry() handler later on).
387 */
388 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler)
/* */
389 {
390 ide_hwgroup_t *hwgroup = HWGROUP(drive);
391 #ifdef DEBUG
392 if (hwgroup->handler != NULL)
393 printk("%s: ide_set_handler: old handler not null\n", drive->name);
394 #endif
395 hwgroup->handler = handler;
396 hwgroup->timer.expires = jiffies + WAIT_CMD;
397 add_timer(&(hwgroup->timer));
398 }
399
400 /*
401 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
402 * value for this drive (from its reported identification information).
403 *
404 * Returns: 1 if lba_capacity looks sensible
405 * 0 otherwise
406 */
407 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
408 {
409 unsigned long lba_sects = id->lba_capacity;
410 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
411 unsigned long _10_percent = chs_sects / 10;
412
413 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
414 if ((lba_sects - chs_sects) < _10_percent)
415 return 1; /* lba_capacity is good */
416
417 /* some drives have the word order reversed */
418 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
419 if ((lba_sects - chs_sects) < _10_percent) {
420 id->lba_capacity = lba_sects; /* fix it */
421 return 1; /* lba_capacity is (now) good */
422 }
423 return 0; /* lba_capacity value is bad */
424 }
425
426 /*
427 * current_capacity() returns the capacity (in sectors) of a drive
428 * according to its current geometry/LBA settings.
429 */
430 static unsigned long current_capacity (ide_drive_t *drive)
/* */
431 {
432 struct hd_driveid *id = drive->id;
433 unsigned long capacity;
434
435 if (!drive->present)
436 return 0;
437 if (drive->media != disk)
438 return 0x1fffff; /* cdrom */
439 /* Determine capacity, and use LBA if the drive properly supports it */
440 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
441 drive->select.b.lba = 1;
442 capacity = id->lba_capacity;
443 } else {
444 drive->select.b.lba = 0;
445 capacity = drive->cyl * drive->head * drive->sect;
446 }
447 return (capacity - drive->sect0);
448 }
449
450 /*
451 * ide_geninit() is called exactly *once* for each major, from genhd.c,
452 * at the beginning of the initial partition check for the drives.
453 */
454 static void ide_geninit (struct gendisk *gd)
/* */
455 {
456 unsigned int unit;
457 ide_hwif_t *hwif = gd->real_devices;
458
459 for (unit = 0; unit < gd->nr_real; ++unit) {
460 ide_drive_t *drive = &hwif->drives[unit];
461 drive->part[0].nr_sects = current_capacity(drive);
462 if (!drive->present || drive->media != disk) {
463 drive->part[0].start_sect = -1; /* skip partition check */
464 }
465 }
466 /*
467 * The partition check in genhd.c needs this string to identify
468 * our minor devices by name for display purposes.
469 * Note that doing this will prevent us from working correctly
470 * if ever called a second time for this major (never happens).
471 */
472 gd->real_devices = hwif->drives[0].name; /* name of first drive */
473 }
474
475 /*
476 * ide_alloc(): memory allocation for use *only* during driver initialization.
477 * If "within_area" is non-zero, the memory will be allocated such that
478 * it lies entirely within a "within_area" sized area (eg. 4096). This is
479 * needed for DMA stuff. "within_area" must be a power of two (not validated).
480 * All allocations are longword aligned.
481 */
482 static unsigned long ide_mem_start = 0uL; /* used by ide_alloc() */
483
484 void *ide_alloc (unsigned long bytecount, unsigned long within_area)
/* */
485 {
486 const unsigned long longsize_m1 = (sizeof(long) - 1);
487 void *p;
488
489 if (!ide_mem_start)
490 panic("ide: ide_alloc() not valid now\n");
491 ide_mem_start = (ide_mem_start + longsize_m1) & ~longsize_m1;
492 if (within_area) {
493 unsigned long fraction = within_area - (ide_mem_start & (within_area - 1));
494 if (fraction < bytecount)
495 ide_mem_start += fraction; /* realign to a new page */
496 }
497 p = (void *) ide_mem_start;
498 ide_mem_start += (bytecount + longsize_m1) & ~longsize_m1;
499 return p;
500 }
501
502 /*
503 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
504 * after probing for drives, to allocate partition tables and other data
505 * structures needed for the routines in genhd.c. ide_geninit() gets called
506 * somewhat later, during the partition check.
507 */
508 static void init_gendisk (ide_hwif_t *hwif)
/* */
509 {
510 struct gendisk *gd;
511 unsigned int unit, units, minors;
512 int *bs;
513
514 /* figure out maximum drive number on the interface */
515 for (units = MAX_DRIVES; units > 0; --units) {
516 if (hwif->drives[units-1].present)
517 break;
518 }
519 minors = units * (1<<PARTN_BITS);
520 gd = ide_alloc (sizeof(struct gendisk), 0);
521 gd->sizes = ide_alloc (minors * sizeof(int), 0);
522 gd->part = ide_alloc (minors * sizeof(struct hd_struct), 0);
523 bs = ide_alloc (minors*sizeof(int), 0);
524
525 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
526 blksize_size[hwif->major] = bs;
527 for (unit = 0; unit < minors; ++unit)
528 *bs++ = BLOCK_SIZE;
529
530 for (unit = 0; unit < units; ++unit)
531 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
532
533 gd->major = hwif->major; /* our major device number */
534 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
535 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
536 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
537 gd->max_nr = units; /* max num real drives */
538 gd->nr_real = units; /* current num real drives */
539 gd->init = ide_geninit; /* initialization function */
540 gd->real_devices= hwif; /* ptr to internal data */
541
542 gd->next = gendisk_head; /* link new major into list */
543 hwif->gd = gendisk_head = gd;
544 }
545
546 static void unexpected_intr (int, ide_hwgroup_t *);
547 /*
548 * reset_ihandler() is a dummy interrupt handler which we install during
549 * an ide interface reset operation. This prevents other devices in the
550 * same hwgroup from being serviced while we play around with shared resources.
551 * If it ever gets invoked, we call unexpected_intr(), which treats the event
552 * the same as a timer_expiry().
553 */
554 static void reset_ihandler (ide_drive_t *drive)
/* */
555 {
556 unsigned long flags;
557
558 save_flags(flags);
559 cli();
560 unexpected_intr (HWIF(drive)->irq, HWGROUP(drive));
561 restore_flags(flags);
562 }
563
564 /*
565 * start_reset_timer() sets up a timer event for 50ms in the future,
566 * to poll for completion of an ide reset operation (no interrupt to help us).
567 */
568 static void start_reset_timer (ide_hwif_t *hwif)
/* */
569 {
570 ide_hwgroup_t *hwgroup = hwif->hwgroup;
571
572 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE; /* max waiting time */
573 hwgroup->handler = &reset_ihandler; /* dummy irq handler */
574 hwgroup->timer.expires = jiffies + (HZ/20); /* polling interval */
575 add_timer(&(hwgroup->timer));
576 }
577
578 #ifdef CONFIG_BLK_DEV_IDECD
579 /*
580 * atapi_reset_handler() gets invoked to poll the interface for completion every 50ms
581 * during an atapi drive reset operation. If the drive has not yet responded,
582 * and we have not yet hit our maximum waiting time, then the timer is restarted
583 * for another 50ms.
584 *
585 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
586 */
587 static int atapi_reset_handler (ide_hwgroup_t *hwgroup)
/* */
588 {
589 ide_hwif_t *hwif = hwgroup->hwif;
590 ide_drive_t *drive = hwgroup->drive;
591 byte stat;
592
593 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
594 udelay (10);
595
596 if (!OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
597 if (jiffies < hwgroup->reset_timeout) {
598 start_reset_timer (hwif);
599 return 1;
600 }
601 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
602 return ide_do_reset (drive); /* do it the old fashioned way */
603 }
604 hwgroup->doing_atapi_reset = 0;
605 hwgroup->handler = NULL; /* allow new requests to be processed */
606 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
607 printk("%s: ATAPI reset complete\n", drive->name);
608 return 0;
609 }
610 #endif /* CONFIG_BLK_DEV_IDECD */
611
612 /*
613 * reset_handler() 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 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
619 */
620 static int reset_handler (ide_hwgroup_t *hwgroup)
/* */
621 {
622 ide_hwif_t *hwif = hwgroup->hwif;
623 ide_drive_t *drive = hwgroup->drive;
624 byte tmp;
625
626 #ifdef CONFIG_BLK_DEV_IDECD
627 if (hwgroup->doing_atapi_reset)
628 return atapi_reset_handler(hwgroup);
629 #endif /* CONFIG_BLK_DEV_IDECD */
630
631 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
632 if (jiffies < hwgroup->reset_timeout) {
633 start_reset_timer (hwif);
634 return 1;
635 }
636 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
637 } else {
638 printk("%s: reset: ", hwif->name);
639 if ((tmp = GET_ERR()) == 1)
640 printk("success\n");
641 else {
642 printk("master: ");
643 switch (tmp & 0x7f) {
644 case 1: printk("passed");
645 break;
646 case 2: printk("formatter device error");
647 break;
648 case 3: printk("sector buffer error");
649 break;
650 case 4: printk("ECC circuitry error");
651 break;
652 case 5: printk("controlling MPU error");
653 break;
654 default:printk("error (0x%02x?)", tmp);
655 }
656 if (tmp & 0x80)
657 printk("; slave: failed");
658 printk("\n");
659 }
660 }
661 hwgroup->handler = NULL; /* allow new requests to be processed */
662 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
663 return 0;
664 }
665
666 /*
667 * ide_do_reset() attempts to recover a confused drive by resetting it.
668 * Unfortunately, resetting a disk drive actually resets all devices on
669 * the same interface, so it can really be thought of as resetting the
670 * interface rather than resetting the drive.
671 *
672 * ATAPI devices have their own reset mechanism which allows them to be
673 * individually reset without clobbering other devices on the same interface.
674 *
675 * Unfortunately, the IDE interface does not generate an interrupt to let
676 * us know when the reset operation has finished, so we must poll for this.
677 * Equally poor, though, is the fact that this may a very long time to complete,
678 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
679 * we set a timer to poll at 50ms intervals.
680 */
681 int ide_do_reset (ide_drive_t *drive)
/* */
682 {
683 unsigned int unit;
684 unsigned long flags;
685 ide_hwif_t *hwif = HWIF(drive);
686 ide_hwgroup_t *hwgroup = HWGROUP(drive);
687
688 save_flags(flags);
689 cli(); /* Why ? */
690
691 #ifdef CONFIG_BLK_DEV_IDECD
692 /* For an ATAPI device, first try an ATAPI SRST. */
693 if (drive->media == cdrom) {
694 if (!hwgroup->doing_atapi_reset) {
695 hwgroup->doing_atapi_reset = 1;
696 if (!drive->keep_settings)
697 drive->unmask = 0;
698 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
699 udelay (20);
700 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
701 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
702 start_reset_timer (hwif); /* begin periodic polling */
703 restore_flags (flags);
704 return 1;
705 }
706 }
707 hwgroup->doing_atapi_reset = 0;
708 #endif /* CONFIG_BLK_DEV_IDECD */
709
710 /*
711 * First, reset any device state data we were maintaining
712 * for any of the drives on this interface.
713 */
714 for (unit = 0; unit < MAX_DRIVES; ++unit) {
715 ide_drive_t *rdrive = &hwif->drives[unit];
716 rdrive->special.b.set_geometry = 1;
717 rdrive->special.b.recalibrate = 1;
718 rdrive->special.b.set_multmode = 0;
719 if (OK_TO_RESET_CONTROLLER)
720 rdrive->mult_count = 0;
721 if (!rdrive->keep_settings) {
722 rdrive->mult_req = 0;
723 rdrive->unmask = 0;
724 }
725 if (rdrive->mult_req != rdrive->mult_count)
726 rdrive->special.b.set_multmode = 1;
727 }
728
729 #if OK_TO_RESET_CONTROLLER
730 /*
731 * Note that we also set nIEN while resetting the device,
732 * to mask unwanted interrupts from the interface during the reset.
733 * However, due to the design of PC hardware, this will cause an
734 * immediate interrupt due to the edge transition it produces.
735 * This single interrupt gives us a "fast poll" for drives that
736 * recover from reset very quickly, saving us the first 50ms wait time.
737 */
738 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
739 udelay(5); /* more than enough time */
740 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
741 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
742 start_reset_timer (hwif); /* begin periodic polling */
743 #endif /* OK_TO_RESET_CONTROLLER */
744
745 restore_flags (flags);
746 return OK_TO_RESET_CONTROLLER; /* 1 = we are waiting, 0 = done */
747 }
748
749 /*
750 * Clean up after success/failure of an explicit (ioctl) drive cmd
751 */
752 static void end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
753 {
754 unsigned long flags;
755 struct request *rq = HWGROUP(drive)->rq;
756 byte *args = (byte *) rq->buffer;
757
758 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
759 if (args) {
760 args[0] = stat;
761 args[1] = err;
762 args[2] = IN_BYTE(IDE_NSECTOR_REG);
763 }
764 save_flags(flags);
765 cli();
766 up(rq->sem);
767 HWGROUP(drive)->rq = NULL;
768 restore_flags(flags);
769 }
770
771 /*
772 * Error reporting, in human readable form (luxurious, but a memory hog).
773 */
774 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
775 {
776 unsigned long flags;
777 byte err = 0;
778
779 save_flags (flags);
780 sti();
781 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
782 #if FANCY_STATUS_DUMPS
783 if (drive->media == disk) {
784 printk(" { ");
785 if (stat & BUSY_STAT)
786 printk("Busy ");
787 else {
788 if (stat & READY_STAT) printk("DriveReady ");
789 if (stat & WRERR_STAT) printk("DeviceFault ");
790 if (stat & SEEK_STAT) printk("SeekComplete ");
791 if (stat & DRQ_STAT) printk("DataRequest ");
792 if (stat & ECC_STAT) printk("CorrectedError ");
793 if (stat & INDEX_STAT) printk("Index ");
794 if (stat & ERR_STAT) printk("Error ");
795 }
796 printk("}");
797 }
798 #endif /* FANCY_STATUS_DUMPS */
799 printk("\n");
800 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
801 err = GET_ERR();
802 printk("%s: %s: error=0x%02x", drive->name, msg, err);
803 #if FANCY_STATUS_DUMPS
804 if (drive->media == disk) {
805 printk(" { ");
806 if (err & BBD_ERR) printk("BadSector ");
807 if (err & ECC_ERR) printk("UncorrectableError ");
808 if (err & ID_ERR) printk("SectorIdNotFound ");
809 if (err & ABRT_ERR) printk("DriveStatusError ");
810 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
811 if (err & MARK_ERR) printk("AddrMarkNotFound ");
812 printk("}");
813 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
814 byte cur = IN_BYTE(IDE_SELECT_REG);
815 if (cur & 0x40) { /* using LBA? */
816 printk(", LBAsect=%ld", (unsigned long)
817 ((cur&0xf)<<24)
818 |(IN_BYTE(IDE_HCYL_REG)<<16)
819 |(IN_BYTE(IDE_LCYL_REG)<<8)
820 | IN_BYTE(IDE_SECTOR_REG));
821 } else {
822 printk(", CHS=%d/%d/%d",
823 (IN_BYTE(IDE_HCYL_REG)<<8) +
824 IN_BYTE(IDE_LCYL_REG),
825 cur & 0xf,
826 IN_BYTE(IDE_SECTOR_REG));
827 }
828 if (HWGROUP(drive)->rq)
829 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
830 }
831 }
832 #endif /* FANCY_STATUS_DUMPS */
833 printk("\n");
834 }
835 restore_flags (flags);
836 return err;
837 }
838
839 /*
840 * try_to_flush_leftover_data() is invoked in response to a drive
841 * unexpectedly having its DRQ_STAT bit set. As an alternative to
842 * resetting the drive, this routine tries to clear the condition
843 * by read a sector's worth of data from the drive. Of course,
844 * this may not help if the drive is *waiting* for data from *us*.
845 */
846 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
847 {
848 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
849
850 while (i > 0) {
851 unsigned long buffer[16];
852 unsigned int wcount = (i > 16) ? 16 : i;
853 i -= wcount;
854 ide_input_data (drive, buffer, wcount);
855 }
856 }
857
858 /*
859 * ide_error() takes action based on the error returned by the controller.
860 *
861 * Returns 1 if an ide reset operation has been initiated, in which case
862 * the caller MUST simply return from the driver (through however many levels).
863 * Returns 0 otherwise.
864 */
865 int ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
866 {
867 struct request *rq;
868 byte err;
869
870 err = ide_dump_status(drive, msg, stat);
871 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
872 return 0;
873 if (rq->cmd == IDE_DRIVE_CMD) { /* never retry an explicit DRIVE_CMD */
874 end_drive_cmd(drive, stat, err);
875 return 0;
876 }
877 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
878 rq->errors |= ERROR_RESET;
879 } else {
880 if (drive->media == disk && (stat & ERR_STAT)) {
881 /* err has different meaning on cdrom */
882 if (err & BBD_ERR) /* retries won't help this! */
883 rq->errors = ERROR_MAX;
884 else if (err & TRK0_ERR) /* help it find track zero */
885 rq->errors |= ERROR_RECAL;
886 }
887 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
888 try_to_flush_leftover_data(drive);
889 }
890 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
891 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
892
893 #ifdef CONFIG_BLK_DEV_TRITON
894 if (rq->errors > 3 && drive->using_dma) { /* DMA troubles? */
895 drive->using_dma = 0;
896 printk("%s: DMA disabled\n", drive->name);
897 --rq->errors;
898 return 0;
899 }
900 #endif /* CONFIG_BLK_DEV_TRITON */
901 if (rq->errors >= ERROR_MAX)
902 ide_end_request(0, HWGROUP(drive));
903 else {
904 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
905 ++rq->errors;
906 return ide_do_reset(drive);
907 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
908 drive->special.b.recalibrate = 1;
909 ++rq->errors;
910 }
911 return 0;
912 }
913
914 /*
915 * read_intr() is the handler for disk read/multread interrupts
916 */
917 static void read_intr (ide_drive_t *drive)
/* */
918 {
919 byte stat;
920 int i;
921 unsigned int msect, nsect;
922 struct request *rq;
923
924 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
925 sti();
926 if (!ide_error(drive, "read_intr", stat))
927 IDE_DO_REQUEST;
928 return;
929 }
930 msect = drive->mult_count;
931 read_next:
932 rq = HWGROUP(drive)->rq;
933 if (msect) {
934 if ((nsect = rq->current_nr_sectors) > msect)
935 nsect = msect;
936 msect -= nsect;
937 } else
938 nsect = 1;
939 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
940 #ifdef DEBUG
941 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
942 drive->name, rq->sector, rq->sector+nsect-1,
943 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
944 #endif
945 rq->sector += nsect;
946 rq->buffer += nsect<<9;
947 rq->errors = 0;
948 i = (rq->nr_sectors -= nsect);
949 if ((rq->current_nr_sectors -= nsect) <= 0)
950 ide_end_request(1, HWGROUP(drive));
951 if (i > 0) {
952 if (msect)
953 goto read_next;
954 ide_set_handler (drive, &read_intr);
955 return;
956 }
957 IDE_DO_REQUEST;
958 }
959
960 /*
961 * write_intr() is the handler for disk write interrupts
962 */
963 static void write_intr (ide_drive_t *drive)
/* */
964 {
965 byte stat;
966 int i;
967 struct request *rq = HWGROUP(drive)->rq;
968
969 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
970 #ifdef DEBUG
971 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
972 drive->name, rq->sector, (unsigned long) rq->buffer,
973 rq->nr_sectors-1);
974 #endif
975 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
976 rq->sector++;
977 rq->buffer += 512;
978 rq->errors = 0;
979 i = --rq->nr_sectors;
980 --rq->current_nr_sectors;
981 if (rq->current_nr_sectors <= 0)
982 ide_end_request(1, HWGROUP(drive));
983 if (i > 0) {
984 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
985 ide_set_handler (drive, &write_intr);
986 return;
987 }
988 IDE_DO_REQUEST;
989 return;
990 }
991 }
992 sti();
993 if (!ide_error(drive, "write_intr", stat))
994 IDE_DO_REQUEST;
995 }
996
997 /*
998 * multwrite() transfers a block of one or more sectors of data to a drive
999 * as part of a disk multwrite operation.
1000 */
1001 static void multwrite (ide_drive_t *drive)
/* */
1002 {
1003 struct request *rq = &HWGROUP(drive)->wrq;
1004 unsigned int mcount = drive->mult_count;
1005
1006 do {
1007 unsigned int nsect = rq->current_nr_sectors;
1008 if (nsect > mcount)
1009 nsect = mcount;
1010 mcount -= nsect;
1011
1012 ide_output_data(drive, rq->buffer, nsect<<7);
1013 #ifdef DEBUG
1014 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1015 drive->name, rq->sector, (unsigned long) rq->buffer,
1016 nsect, rq->nr_sectors - nsect);
1017 #endif
1018 if ((rq->nr_sectors -= nsect) <= 0)
1019 break;
1020 if ((rq->current_nr_sectors -= nsect) == 0) {
1021 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1022 rq->current_nr_sectors = rq->bh->b_size>>9;
1023 rq->buffer = rq->bh->b_data;
1024 } else {
1025 panic("%s: buffer list corrupted\n", drive->name);
1026 break;
1027 }
1028 } else {
1029 rq->buffer += nsect << 9;
1030 }
1031 } while (mcount);
1032 }
1033
1034 /*
1035 * write_intr() is the handler for disk multwrite interrupts
1036 */
1037 static void multwrite_intr (ide_drive_t *drive)
/* */
1038 {
1039 byte stat;
1040 int i;
1041 struct request *rq = &HWGROUP(drive)->wrq;
1042
1043 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1044 if (stat & DRQ_STAT) {
1045 if (rq->nr_sectors) {
1046 multwrite(drive);
1047 ide_set_handler (drive, &multwrite_intr);
1048 return;
1049 }
1050 } else {
1051 if (!rq->nr_sectors) { /* all done? */
1052 rq = HWGROUP(drive)->rq;
1053 for (i = rq->nr_sectors; i > 0;){
1054 i -= rq->current_nr_sectors;
1055 ide_end_request(1, HWGROUP(drive));
1056 }
1057 IDE_DO_REQUEST;
1058 return;
1059 }
1060 }
1061 }
1062 sti();
1063 if (!ide_error(drive, "multwrite_intr", stat))
1064 IDE_DO_REQUEST;
1065 }
1066
1067 /*
1068 * Issue a simple drive command
1069 * The drive must be selected beforehand.
1070 */
1071 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1072 {
1073 ide_set_handler (drive, handler);
1074 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1075 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1076 OUT_BYTE(cmd,IDE_COMMAND_REG);
1077 }
1078
1079 /*
1080 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1081 */
1082 static void set_multmode_intr (ide_drive_t *drive)
/* */
1083 {
1084 byte stat = GET_STAT();
1085
1086 sti();
1087 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1088 drive->mult_count = drive->mult_req;
1089 } else {
1090 drive->mult_req = drive->mult_count = 0;
1091 drive->special.b.recalibrate = 1;
1092 (void) ide_dump_status(drive, "set_multmode", stat);
1093 }
1094 IDE_DO_REQUEST;
1095 }
1096
1097 /*
1098 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1099 */
1100 static void set_geometry_intr (ide_drive_t *drive)
/* */
1101 {
1102 byte stat = GET_STAT();
1103
1104 sti();
1105 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1106 if (ide_error(drive, "set_geometry_intr", stat))
1107 return;
1108 IDE_DO_REQUEST;
1109 }
1110
1111 /*
1112 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1113 */
1114 static void recal_intr (ide_drive_t *drive)
/* */
1115 {
1116 byte stat = GET_STAT();
1117
1118 sti();
1119 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1120 if (ide_error(drive, "recal_intr", stat))
1121 return;
1122 IDE_DO_REQUEST;
1123 }
1124
1125 /*
1126 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1127 */
1128 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1129 {
1130 byte stat = GET_STAT();
1131
1132 sti();
1133 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1134 end_drive_cmd (drive, stat, GET_ERR());
1135 else if (ide_error(drive, "drive_cmd", stat)) /* calls end_drive_cmd */
1136 return;
1137 IDE_DO_REQUEST;
1138 }
1139
1140 /*
1141 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1142 * commands to a drive. It used to do much more, but has been scaled back
1143 * in recent updates, and could be completely eliminated with a bit more effort.
1144 */
1145 static inline void do_special (ide_drive_t *drive)
/* */
1146 {
1147 special_t *s = &drive->special;
1148 #ifdef DEBUG
1149 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1150 #endif
1151 if (s->b.set_geometry) {
1152 s->b.set_geometry = 0;
1153 if (drive->media == disk) {
1154 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1155 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1156 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1157 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1158 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1159 }
1160 } else if (s->b.recalibrate) {
1161 s->b.recalibrate = 0;
1162 if (drive->media == disk) {
1163 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1164 }
1165 } else if (s->b.set_multmode) {
1166 s->b.set_multmode = 0;
1167 if (drive->media == disk) {
1168 if (drive->id && drive->mult_req > drive->id->max_multsect)
1169 drive->mult_req = drive->id->max_multsect;
1170 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1171 } else
1172 drive->mult_req = 0;
1173 } else if (s->all) {
1174 s->all = 0;
1175 printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1176 }
1177 }
1178
1179 /*
1180 * This routine busy-waits for the drive status to be not "busy".
1181 * It then checks the status for all of the "good" bits and none
1182 * of the "bad" bits, and if all is okay it returns 0. All other
1183 * cases return 1 after invoking ide_error()
1184 *
1185 * This routine should get fixed to not hog the cpu during extra long waits..
1186 * That could be done by busy-waiting for the first jiffy or two, and then
1187 * setting a timer to wake up at half second intervals thereafter,
1188 * until WAIT_WORSTCASE is achieved, before timing out.
1189 */
1190 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1191 {
1192 byte stat;
1193 unsigned long flags;
1194 test:
1195 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1196 if (OK_STAT((stat = GET_STAT()), good, bad))
1197 return 0; /* fast exit for most frequent case */
1198 if (!(stat & BUSY_STAT)) {
1199 (void) ide_error(drive, "status error", stat);
1200 return 1;
1201 }
1202
1203 save_flags(flags);
1204 sti();
1205 timeout += jiffies;
1206 do {
1207 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1208 restore_flags(flags);
1209 goto test;
1210 }
1211 } while (jiffies <= timeout);
1212
1213 restore_flags(flags);
1214 (void) ide_error(drive, "status timeout", GET_STAT());
1215 return 1;
1216 }
1217
1218 /*
1219 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1220 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1221 * care of issuing special DRIVE_CMDs.
1222 */
1223 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1224 {
1225 unsigned short io_base = HWIF(drive)->io_base;
1226
1227 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1228 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1229 if (drive->select.b.lba) {
1230 #ifdef DEBUG
1231 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1232 drive->name, (rq->cmd==READ)?"read":"writ",
1233 block, rq->nr_sectors, (unsigned long) rq->buffer);
1234 #endif
1235 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1236 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1237 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1238 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1239 } else {
1240 unsigned int sect,head,cyl,track;
1241 track = block / drive->sect;
1242 sect = block % drive->sect + 1;
1243 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1244 head = track % drive->head;
1245 cyl = track / drive->head;
1246 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1247 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1248 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1249 #ifdef DEBUG
1250 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1251 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1252 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1253 #endif
1254 }
1255 if (rq->cmd == READ) {
1256 #ifdef CONFIG_BLK_DEV_TRITON
1257 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1258 return;
1259 #endif /* CONFIG_BLK_DEV_TRITON */
1260 ide_set_handler(drive, &read_intr);
1261 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1262 return;
1263 }
1264 if (rq->cmd == WRITE) {
1265 #ifdef CONFIG_BLK_DEV_TRITON
1266 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1267 return;
1268 #endif /* CONFIG_BLK_DEV_TRITON */
1269 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1270 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1271 printk("%s: no DRQ after issuing %s\n", drive->name,
1272 drive->mult_count ? "MULTWRITE" : "WRITE");
1273 return;
1274 }
1275 if (!drive->unmask)
1276 cli();
1277 if (drive->mult_count) {
1278 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1279 ide_set_handler (drive, &multwrite_intr);
1280 multwrite(drive);
1281 } else {
1282 ide_set_handler (drive, &write_intr);
1283 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1284 }
1285 return;
1286 }
1287 if (rq->cmd == IDE_DRIVE_CMD) {
1288 byte *args = rq->buffer;
1289 if (args) {
1290 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1291 drive->name, args[0], args[1], args[2]);
1292 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1293 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1294 return;
1295 } else {
1296 /*
1297 * NULL is actually a valid way of waiting for
1298 * all current requests to be flushed from the queue.
1299 */
1300 #ifdef DEBUG
1301 printk("%s: DRIVE_CMD (null)\n", drive->name);
1302 #endif
1303 end_drive_cmd(drive, GET_STAT(), GET_ERR());
1304 return;
1305 }
1306 }
1307 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1308 ide_end_request(0, HWGROUP(drive));
1309 }
1310
1311 /*
1312 * do_request() initiates handling of a new I/O request
1313 */
1314 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1315 {
1316 unsigned int minor, unit;
1317 unsigned long block, blockend;
1318 ide_drive_t *drive;
1319
1320 sti();
1321 #ifdef DEBUG
1322 printk("%s: ide_do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1323 #endif
1324 minor = MINOR(rq->rq_dev);
1325 unit = minor >> PARTN_BITS;
1326 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1327 printk("%s: bad device number: %s\n",
1328 hwif->name, kdevname(rq->rq_dev));
1329 goto kill_rq;
1330 }
1331 drive = &hwif->drives[unit];
1332 #ifdef DEBUG
1333 if (rq->bh && !rq->bh->b_lock) {
1334 printk("%s: block not locked\n", drive->name);
1335 goto kill_rq;
1336 }
1337 #endif
1338 block = rq->sector;
1339 blockend = block + rq->nr_sectors;
1340 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1341 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1342 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1343 goto kill_rq;
1344 }
1345 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1346 #if FAKE_FDISK_FOR_EZDRIVE
1347 if (block == 0 && drive->ezdrive) {
1348 block = 1;
1349 printk("%s: [EZD] accessing sector 1 instead of sector 0\n", drive->name);
1350 }
1351 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1352 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1353 #if (DISK_RECOVERY_TIME > 0)
1354 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1355 #endif
1356 #if SUPPORT_HT6560B
1357 if (hwif->select)
1358 ide_hwif_select (hwif);
1359 #endif
1360 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1361 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1362 printk("%s: drive not ready for command\n", drive->name);
1363 return;
1364
1365 }
1366 if (!drive->special.all) {
1367 #ifdef CONFIG_BLK_DEV_IDECD
1368 switch (drive->media) {
1369 case disk:
1370 do_rw_disk (drive, rq, block);
1371 return;
1372 case cdrom:
1373 ide_do_rw_cdrom (drive, block);
1374 return;
1375 default:
1376 printk("%s: media type %d not supported\n",
1377 drive->name, drive->media);
1378 goto kill_rq;
1379 }
1380 #else
1381 do_rw_disk (drive, rq, block); /* simpler and faster */
1382 return;
1383 #endif;
1384 }
1385 do_special(drive);
1386 return;
1387 kill_rq:
1388 ide_end_request(0, hwif->hwgroup);
1389 }
1390
1391 /*
1392 * The driver enables interrupts as much as possible. In order to do this,
1393 * (a) the device-interrupt is always masked before entry, and
1394 * (b) the timeout-interrupt is always disabled before entry.
1395 *
1396 * If we enter here from, say irq14, and then start a new request for irq15,
1397 * (possible with "serialize" option) then we cannot ensure that we exit
1398 * before the irq15 hits us. So, we must be careful not to let this bother us.
1399 *
1400 * Interrupts are still masked (by default) whenever we are exchanging
1401 * data/cmds with a drive, because some drives seem to have very poor
1402 * tolerance for latency during I/O. For devices which don't suffer from
1403 * this problem (most don't), the unmask flag can be set using the "hdparm"
1404 * utility, to permit other interrupts during data/cmd transfers.
1405 */
1406 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1407 {
1408 cli(); /* paranoia */
1409 if (hwgroup->handler != NULL) {
1410 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1411 return;
1412 }
1413 do {
1414 ide_hwif_t *hwif = hwgroup->hwif;
1415 struct request *rq;
1416 if ((rq = hwgroup->rq) == NULL) {
1417 hwgroup->drive = NULL; /* paranoia */
1418 do {
1419 rq = blk_dev[hwif->major].current_request;
1420 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1421 goto got_rq;
1422 } while ((hwif = hwif->next) != hwgroup->hwif);
1423 return; /* no work left for this hwgroup */
1424 got_rq:
1425 blk_dev[hwif->major].current_request = rq->next;
1426 }
1427 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1428 cli();
1429 } while (hwgroup->handler == NULL);
1430 }
1431
1432 /*
1433 * do_hwgroup_request() invokes ide_do_request() after first masking
1434 * all possible interrupts for the current hwgroup. This prevents race
1435 * conditions in the event that an unexpected interrupt occurs while
1436 * we are in the driver.
1437 *
1438 * Note that when an interrupt is used to reenter the driver, the first level
1439 * handler will already have masked the irq that triggered, but any other ones
1440 * for the hwgroup will still be unmasked. The driver tries to be careful
1441 * about such things.
1442 */
1443 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1444 {
1445 if (hwgroup->handler == NULL) {
1446 ide_hwif_t *hgif = hwgroup->hwif;
1447 ide_hwif_t *hwif = hgif;
1448 do {
1449 disable_irq(hwif->irq);
1450 } while ((hwif = hwif->next) != hgif);
1451 ide_do_request (hwgroup);
1452 do {
1453 enable_irq(hwif->irq);
1454 } while ((hwif = hwif->next) != hgif);
1455 }
1456 }
1457
1458 static void do_ide0_request (void) /* invoked with cli() */
/* */
1459 {
1460 do_hwgroup_request (ide_hwifs[0].hwgroup);
1461 }
1462
1463 static void do_ide1_request (void) /* invoked with cli() */
/* */
1464 {
1465 do_hwgroup_request (ide_hwifs[1].hwgroup);
1466 }
1467
1468 static void do_ide2_request (void) /* invoked with cli() */
/* */
1469 {
1470 do_hwgroup_request (ide_hwifs[2].hwgroup);
1471 }
1472
1473 static void do_ide3_request (void) /* invoked with cli() */
/* */
1474 {
1475 do_hwgroup_request (ide_hwifs[3].hwgroup);
1476 }
1477
1478 static void timer_expiry (unsigned long data)
/* */
1479 {
1480 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1481 ide_drive_t *drive = hwgroup->drive;
1482 unsigned long flags;
1483
1484 save_flags(flags);
1485 cli();
1486
1487 if (hwgroup->reset_timeout != 0) { /* ide reset in progress? */
1488 if (!reset_handler(hwgroup))
1489 do_hwgroup_request (hwgroup);
1490 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1491 sti(); /* drive must have responded just as the timer expired */
1492 printk("%s: marginal timeout\n", drive->name);
1493 } else { /* drive not responding */
1494 hwgroup->handler = NULL;
1495 if (hwgroup->hwif->dmaproc)
1496 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1497 if (!ide_error(drive, "irq timeout", GET_STAT()))
1498 do_hwgroup_request (hwgroup);
1499 }
1500 restore_flags(flags);
1501 }
1502
1503 /*
1504 * There's nothing really useful we can do with an unexpected interrupt,
1505 * other than reading the status register (to clear it), and logging it.
1506 * There should be no way that an irq can happen before we're ready for it,
1507 * so we needn't worry much about losing an "important" interrupt here.
1508 *
1509 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1510 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1511 * "good", we just ignore the interrupt completely.
1512 *
1513 * This routine assumes cli() is in effect when called.
1514 *
1515 * If an unexpected interrupt happens on irq15 while we are handling irq14
1516 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1517 * we could screw up by interfering with a new request being set up for irq15.
1518 *
1519 * In reality, this is a non-issue. The new command is not sent unless the
1520 * drive is ready to accept one, in which case we know the drive is not
1521 * trying to interrupt us. And ide_set_handler() is always invoked before
1522 * completing the issuance of any new drive command, so we will not be
1523 * accidently invoked as a result of any valid command completion interrupt.
1524 *
1525 */
1526 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1527 {
1528 byte stat;
1529 unsigned int unit;
1530 ide_hwif_t *hwif = hwgroup->hwif;
1531
1532 /*
1533 * check for ide reset in progress
1534 */
1535 if (hwgroup->reset_timeout != 0) {
1536 if (!reset_handler(hwgroup))
1537 do_hwgroup_request (hwgroup);
1538 return;
1539 }
1540
1541 /*
1542 * handle the unexpected interrupt
1543 */
1544 do {
1545 if (hwif->irq == irq) {
1546 #if SUPPORT_HT6560B
1547 if (hwif->select)
1548 ide_hwif_select (hwif);
1549 #endif
1550 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1551 ide_drive_t *drive = &hwif->drives[unit];
1552 if (!drive->present)
1553 continue;
1554 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1555 (void) ide_dump_status(drive, "unexpected_intr", stat);
1556 if ((stat & DRQ_STAT))
1557 try_to_flush_leftover_data(drive);
1558 }
1559 }
1560 } while ((hwif = hwif->next) != hwgroup->hwif);
1561 }
1562
1563 /*
1564 * entry point for all interrupts, caller does cli() for us
1565 */
1566 static void ide_intr (int irq, struct pt_regs *regs)
/* */
1567 {
1568 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1569 ide_handler_t *handler;
1570
1571 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1572 ide_drive_t *drive = hwgroup->drive;
1573 hwgroup->handler = NULL;
1574 del_timer(&(hwgroup->timer));
1575 if (drive->unmask)
1576 sti();
1577 handler(drive);
1578 } else {
1579 unexpected_intr(irq, hwgroup);
1580 }
1581 cli();
1582 }
1583
1584 /*
1585 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1586 * It returns NULL if the given device number does not match any present drives.
1587 */
1588 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1589 {
1590 int major = MAJOR(i_rdev);
1591 unsigned int h;
1592
1593 for (h = 0; h < MAX_HWIFS; ++h) {
1594 ide_hwif_t *hwif = &ide_hwifs[h];
1595 if (hwif->present && major == hwif->major) {
1596 unsigned unit = DEVICE_NR(i_rdev);
1597 if (unit < MAX_DRIVES) {
1598 ide_drive_t *drive = &hwif->drives[unit];
1599 if (drive->present)
1600 return drive;
1601 } else if (major == IDE0_MAJOR && unit < 4) {
1602 printk("ide: probable bad entry for /dev/hd%c%d\n",
1603 'a' + unit, MINOR(i_rdev) & PARTN_MASK);
1604 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1605 }
1606 break;
1607 }
1608 }
1609 return NULL;
1610 }
1611
1612 /*
1613 * This function issues a specific IDE drive command onto the
1614 * tail of the request queue, and waits for it to be completed.
1615 * If arg is NULL, it goes through all the motions,
1616 * but without actually sending a command to the drive.
1617 */
1618 int ide_do_drive_cmd(kdev_t rdev, char *args)
/* */
1619 {
1620 unsigned long flags;
1621 unsigned int major = MAJOR(rdev);
1622 struct request rq, *cur_rq;
1623 struct blk_dev_struct *bdev;
1624 struct semaphore sem = MUTEX_LOCKED;
1625
1626 /* build up a special request, and add it to the queue */
1627 rq.buffer = args;
1628 rq.cmd = IDE_DRIVE_CMD;
1629 rq.errors = 0;
1630 rq.sector = 0;
1631 rq.nr_sectors = 0;
1632 rq.current_nr_sectors = 0;
1633 rq.sem = &sem;
1634 rq.bh = NULL;
1635 rq.bhtail = NULL;
1636 rq.next = NULL;
1637 rq.rq_status = RQ_ACTIVE;
1638 rq.rq_dev = rdev;
1639 bdev = &blk_dev[major];
1640
1641 save_flags(flags);
1642 cli();
1643 cur_rq = bdev->current_request;
1644 if (cur_rq == NULL) { /* empty request list? */
1645 bdev->current_request = &rq; /* service ours immediately */
1646 bdev->request_fn();
1647 } else {
1648 while (cur_rq->next != NULL) /* find end of request list */
1649 cur_rq = cur_rq->next;
1650 cur_rq->next = &rq; /* add rq to the end */
1651 }
1652
1653 down(&sem); /* wait for it to be serviced */
1654 restore_flags(flags);
1655 return rq.errors ? -EIO : 0; /* return -EIO if errors */
1656 }
1657
1658 static int ide_open(struct inode * inode, struct file * filp)
/* */
1659 {
1660 ide_drive_t *drive;
1661 unsigned long flags;
1662
1663 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1664 return -ENODEV;
1665 save_flags(flags);
1666 cli();
1667 while (drive->busy)
1668 sleep_on(&drive->wqueue);
1669 drive->usage++;
1670 restore_flags(flags);
1671 #ifdef CONFIG_BLK_DEV_IDECD
1672 if (drive->media == cdrom)
1673 return ide_cdrom_open (inode, filp, drive);
1674 #endif /* CONFIG_BLK_DEV_IDECD */
1675 if (drive->removeable) {
1676 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1677 check_disk_change(inode->i_rdev);
1678 ide_do_drive_cmd(inode->i_rdev, door_lock);
1679 }
1680 return 0;
1681 }
1682
1683 /*
1684 * Releasing a block device means we sync() it, so that it can safely
1685 * be forgotten about...
1686 */
1687 static void ide_release(struct inode * inode, struct file * file)
/* */
1688 {
1689 ide_drive_t *drive;
1690
1691 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1692 sync_dev(inode->i_rdev);
1693 drive->usage--;
1694 #ifdef CONFIG_BLK_DEV_IDECD
1695 if (drive->media == cdrom)
1696 ide_cdrom_release (inode, file, drive);
1697 else
1698 #endif /* CONFIG_BLK_DEV_IDECD */
1699 if (drive->removeable) {
1700 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1701 invalidate_buffers(inode->i_rdev);
1702 ide_do_drive_cmd(inode->i_rdev, door_unlock);
1703 }
1704 }
1705 }
1706
1707 /*
1708 * This routine is called to flush all partitions and partition tables
1709 * for a changed disk, and then re-read the new partition table.
1710 * If we are revalidating a disk because of a media change, then we
1711 * enter with usage == 0. If we are using an ioctl, we automatically have
1712 * usage == 1 (we need an open channel to use an ioctl :-), so this
1713 * is our limit.
1714 */
1715 static int revalidate_disk(kdev_t i_rdev)
/* */
1716 {
1717 ide_drive_t *drive;
1718 unsigned int p, major, minor;
1719 long flags;
1720
1721 if ((drive = get_info_ptr(i_rdev)) == NULL)
1722 return -ENODEV;
1723
1724 major = MAJOR(i_rdev);
1725 minor = drive->select.b.unit << PARTN_BITS;
1726 save_flags(flags);
1727 cli();
1728 if (drive->busy || (drive->usage > 1)) {
1729 restore_flags(flags);
1730 return -EBUSY;
1731 };
1732 drive->busy = 1;
1733 restore_flags(flags);
1734
1735 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1736 if (drive->part[p].nr_sects > 0) {
1737 kdev_t devp = MKDEV(major, minor+p);
1738 sync_dev (devp);
1739 invalidate_inodes (devp);
1740 invalidate_buffers (devp);
1741 }
1742 drive->part[p].start_sect = 0;
1743 drive->part[p].nr_sects = 0;
1744 };
1745
1746 drive->part[0].nr_sects = current_capacity(drive);
1747 if (drive->media == disk)
1748 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1749
1750 drive->busy = 0;
1751 wake_up(&drive->wqueue);
1752 return 0;
1753 }
1754
1755 static int write_fs_long (unsigned long useraddr, long value)
/* */
1756 {
1757 int err;
1758
1759 if (NULL == (long *)useraddr)
1760 return -EINVAL;
1761 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1762 return err;
1763 put_user((unsigned)value, (long *) useraddr);
1764 return 0;
1765 }
1766
1767 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1768 unsigned int cmd, unsigned long arg)
1769 {
1770 struct hd_geometry *loc = (struct hd_geometry *) arg;
1771 int err;
1772 ide_drive_t *drive;
1773 unsigned long flags;
1774
1775 if (!inode || !(inode->i_rdev))
1776 return -EINVAL;
1777 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1778 return -ENODEV;
1779 switch (cmd) {
1780 case HDIO_GETGEO:
1781 if (!loc || drive->media != disk) return -EINVAL;
1782 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1783 if (err) return err;
1784 put_user(drive->bios_head, (byte *) &loc->heads);
1785 put_user(drive->bios_sect, (byte *) &loc->sectors);
1786 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1787 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1788 (unsigned long *) &loc->start);
1789 return 0;
1790
1791 case BLKFLSBUF:
1792 if(!suser()) return -EACCES;
1793 fsync_dev(inode->i_rdev);
1794 invalidate_buffers(inode->i_rdev);
1795 return 0;
1796
1797 case BLKRASET:
1798 if(!suser()) return -EACCES;
1799 if(arg > 0xff) return -EINVAL;
1800 read_ahead[MAJOR(inode->i_rdev)] = arg;
1801 return 0;
1802
1803 case BLKRAGET:
1804 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1805
1806 case BLKGETSIZE: /* Return device size */
1807 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1808 case BLKRRPART: /* Re-read partition tables */
1809 return revalidate_disk(inode->i_rdev);
1810
1811 case HDIO_GET_KEEPSETTINGS:
1812 return write_fs_long(arg, drive->keep_settings);
1813
1814 case HDIO_GET_UNMASKINTR:
1815 return write_fs_long(arg, drive->unmask);
1816
1817 case HDIO_GET_DMA:
1818 return write_fs_long(arg, drive->using_dma);
1819
1820 case HDIO_GET_CHIPSET:
1821 return write_fs_long(arg, drive->chipset);
1822
1823 case HDIO_GET_MULTCOUNT:
1824 return write_fs_long(arg, drive->mult_count);
1825
1826 case HDIO_GET_IDENTITY:
1827 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1828 return -EINVAL;
1829 if (drive->id == NULL)
1830 return -ENOMSG;
1831 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1832 if (!err)
1833 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1834 return err;
1835
1836 case HDIO_GET_NOWERR:
1837 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1838
1839 case HDIO_SET_DMA:
1840 if (drive->media != disk)
1841 return -EPERM;
1842 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1843 return -EPERM;
1844 case HDIO_SET_KEEPSETTINGS:
1845 case HDIO_SET_UNMASKINTR:
1846 case HDIO_SET_NOWERR:
1847 if (arg > 1)
1848 return -EINVAL;
1849 case HDIO_SET_CHIPSET:
1850 if (!suser())
1851 return -EACCES;
1852 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1853 return -EINVAL;
1854 save_flags(flags);
1855 cli();
1856 switch (cmd) {
1857 case HDIO_SET_DMA:
1858 drive->using_dma = arg;
1859 break;
1860 case HDIO_SET_KEEPSETTINGS:
1861 drive->keep_settings = arg;
1862 break;
1863 case HDIO_SET_UNMASKINTR:
1864 if (arg && disallow_unmask) {
1865 restore_flags(flags);
1866 return -EPERM;
1867 }
1868 drive->unmask = arg;
1869 break;
1870 case HDIO_SET_NOWERR:
1871 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1872 break;
1873 case HDIO_SET_CHIPSET:
1874 drive->chipset = arg;
1875 drive->vlb_32bit = (arg & 1);
1876 drive->vlb_sync = (arg & 2) >> 1;
1877 #ifndef VLB_SYNC
1878 if (drive->vlb_sync)
1879 printk("%s: VLB_SYNC not supported by this kernel\n", drive->name);
1880 #endif
1881 break;
1882 }
1883 restore_flags(flags);
1884 return 0;
1885
1886 case HDIO_SET_MULTCOUNT:
1887 if (!suser())
1888 return -EACCES;
1889 if (MINOR(inode->i_rdev) & PARTN_MASK)
1890 return -EINVAL;
1891 if ((drive->id != NULL) && (arg > drive->id->max_multsect))
1892 return -EINVAL;
1893 save_flags(flags);
1894 cli();
1895 if (drive->special.b.set_multmode) {
1896 restore_flags(flags);
1897 return -EBUSY;
1898 }
1899 drive->mult_req = arg;
1900 drive->special.b.set_multmode = 1;
1901 restore_flags(flags);
1902 ide_do_drive_cmd (inode->i_rdev, NULL);
1903 return (drive->mult_count == arg) ? 0 : -EIO;
1904
1905 case HDIO_DRIVE_CMD:
1906 {
1907 unsigned long args;
1908
1909 if (NULL == (long *) arg)
1910 err = ide_do_drive_cmd(inode->i_rdev,NULL);
1911 else {
1912 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1913 {
1914 args = get_user((long *)arg);
1915 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1916 err = ide_do_drive_cmd(inode->i_rdev,(char *)&args);
1917 put_user(args,(long *)arg);
1918 }
1919 }
1920 }
1921 return err;
1922 }
1923
1924 RO_IOCTLS(inode->i_rdev, arg);
1925
1926 default:
1927 #ifdef CONFIG_BLK_DEV_IDECD
1928 if (drive->media == cdrom)
1929 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
1930 #endif /* CONFIG_BLK_DEV_IDECD */
1931 return -EPERM;
1932 }
1933 }
1934
1935 static int ide_check_media_change (kdev_t i_rdev)
/* */
1936 {
1937 ide_drive_t *drive;
1938
1939 if ((drive = get_info_ptr(i_rdev)) == NULL)
1940 return -ENODEV;
1941 #ifdef CONFIG_BLK_DEV_IDECD
1942 if (drive->media == cdrom)
1943 return ide_cdrom_check_media_change (drive);
1944 #endif /* CONFIG_BLK_DEV_IDECD */
1945 if (drive->removeable) /* for disks */
1946 return 1; /* always assume it was changed */
1947 return 0;
1948 }
1949
1950 static void fixstring (byte *s, const int bytecount, const int byteswap)
/* */
1951 {
1952 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
1953
1954 if (byteswap) {
1955 /* convert from big-endian to host byte order */
1956 for (p = end ; p != s;) {
1957 unsigned short *pp = (unsigned short *) (p -= 2);
1958 *pp = ntohs(*pp);
1959 }
1960 }
1961
1962 /* strip leading blanks */
1963 while (s != end && *s == ' ')
1964 ++s;
1965
1966 /* compress internal blanks and strip trailing blanks */
1967 while (s != end && *s) {
1968 if (*s++ != ' ' || (s != end && *s && *s != ' '))
1969 *p++ = *(s-1);
1970 }
1971
1972 /* wipe out trailing garbage */
1973 while (p != end)
1974 *p++ = '\0';
1975 }
1976
1977 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
1978 {
1979 int bswap;
1980 struct hd_driveid *id;
1981 unsigned long capacity, check;
1982
1983 id = drive->id = ide_alloc (SECTOR_WORDS*4, 0);
1984 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
1985 sti();
1986
1987 /*
1988 * EATA SCSI controllers do a hardware ATA emulation: ignore them
1989 */
1990 if ((id->model[0] == 'P' && id->model[1] == 'M')
1991 || (id->model[0] == 'S' && id->model[1] == 'K')) {
1992 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
1993 drive->present = 0;
1994 return;
1995 }
1996
1997 /*
1998 * WIN_IDENTIFY returns little-endian info,
1999 * WIN_PIDENTIFY *usually* returns little-endian info.
2000 */
2001 bswap = 1;
2002 if (cmd == WIN_PIDENTIFY) {
2003 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2004 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2005 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2006 bswap = 0; /* Vertos drives may still be weird */
2007 }
2008 fixstring (id->model, sizeof(id->model), bswap);
2009 fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2010 fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2011
2012 /*
2013 * Check for an ATAPI device
2014 */
2015 if (cmd == WIN_PIDENTIFY) {
2016 #ifdef CONFIG_BLK_DEV_IDECD
2017 byte type = (id->config >> 8) & 0x0f;
2018 #endif /* CONFIG_BLK_DEV_IDECD */
2019 printk("%s: %s, ATAPI, ", drive->name, id->model);
2020 drive->media = cdrom;
2021 #ifdef CONFIG_BLK_DEV_IDECD
2022 if (type == 0 || type == 5)
2023 printk("CDROM drive\n");
2024 else
2025 printk("UNKNOWN device\n");
2026 drive->present = 1;
2027 drive->removeable = 1;
2028 #else
2029 printk("not supported by this kernel\n");
2030 #endif /* CONFIG_BLK_DEV_IDECD */
2031 return;
2032 }
2033
2034 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2035 if (id->config & (1<<7)) { /* removeable disk ? */
2036 if (id->model[0] != 'W' || id->model[1] != 'D')
2037 drive->removeable = 1;
2038 }
2039
2040 drive->media = disk;
2041 /* Extract geometry if we did not already have one for the drive */
2042 if (!drive->present) {
2043 drive->present = 1;
2044 drive->cyl = drive->bios_cyl = id->cyls;
2045 drive->head = drive->bios_head = id->heads;
2046 drive->sect = drive->bios_sect = id->sectors;
2047 }
2048 /* Handle logical geometry translation by the drive */
2049 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2050 && (id->cur_heads <= 16) && id->cur_sectors)
2051 {
2052 /*
2053 * Extract the physical drive geometry for our use.
2054 * Note that we purposely do *not* update the bios info.
2055 * This way, programs that use it (like fdisk) will
2056 * still have the same logical view as the BIOS does,
2057 * which keeps the partition table from being screwed.
2058 *
2059 * An exception to this is the cylinder count,
2060 * which we reexamine later on to correct for 1024 limitations.
2061 */
2062 drive->cyl = id->cur_cyls;
2063 drive->head = id->cur_heads;
2064 drive->sect = id->cur_sectors;
2065
2066 /* check for word-swapped "capacity" field in id information */
2067 capacity = drive->cyl * drive->head * drive->sect;
2068 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2069 if (check == capacity) { /* was it swapped? */
2070 /* yes, bring it into little-endian order: */
2071 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2072 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2073 }
2074 }
2075 /* Use physical geometry if what we have still makes no sense */
2076 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2077 drive->cyl = id->cyls;
2078 drive->head = id->heads;
2079 drive->sect = id->sectors;
2080 }
2081 /* Correct the number of cyls if the bios value is too small */
2082 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2083 if (drive->cyl > drive->bios_cyl)
2084 drive->bios_cyl = drive->cyl;
2085 }
2086
2087 (void) current_capacity (drive); /* initialize LBA selection */
2088
2089 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2090 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2091 drive->select.b.lba ? "LBA, " : "",
2092 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2093
2094 drive->mult_count = 0;
2095 if (id->max_multsect) {
2096 drive->mult_req = INITIAL_MULT_COUNT;
2097 if (drive->mult_req > id->max_multsect)
2098 drive->mult_req = id->max_multsect;
2099 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2100 drive->special.b.set_multmode = 1;
2101 }
2102 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2103 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2104 printk(", DMA");
2105 }
2106 printk("\n");
2107 }
2108
2109 /*
2110 * Delay for *at least* 10ms. As we don't know how much time is left
2111 * until the next tick occurs, we wait an extra tick to be safe.
2112 */
2113 static void delay_10ms (void)
/* */
2114 {
2115 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2116 while (timer > jiffies);
2117 }
2118
2119 /*
2120 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2121 * and waits for a response. It also monitors irqs while this is
2122 * happening, in hope of automatically determining which one is
2123 * being used by the interface.
2124 *
2125 * Returns: 0 device was identified
2126 * 1 device timed-out (no response to identify request)
2127 * 2 device aborted the command (refused to identify itself)
2128 */
2129 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2130 {
2131 int hd_status, rc;
2132 unsigned long timeout;
2133 int irqs = 0;
2134
2135 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2136 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2137 irqs = probe_irq_on(); /* start monitoring irqs */
2138 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2139 }
2140
2141 delay_10ms(); /* take a deep breath */
2142 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2143 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2144 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2145 } else
2146 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2147
2148 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2149 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2150 timeout += jiffies;
2151 do {
2152 if (jiffies > timeout) {
2153 if (!HWIF(drive)->irq)
2154 (void) probe_irq_off(irqs);
2155 return 1; /* drive timed-out */
2156 }
2157 delay_10ms(); /* give drive a breather */
2158 } while (IN_BYTE(hd_status) & BUSY_STAT);
2159
2160 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2161 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2162 cli(); /* some systems need this */
2163 do_identify(drive, cmd); /* drive returned ID */
2164 rc = 0; /* success */
2165 } else
2166 rc = 2; /* drive refused ID */
2167 if (!HWIF(drive)->irq) {
2168 irqs = probe_irq_off(irqs); /* get irq number */
2169 if (irqs > 0)
2170 HWIF(drive)->irq = irqs;
2171 else /* Mmmm.. multiple IRQs */
2172 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2173 }
2174 return rc;
2175 }
2176
2177 /*
2178 * do_probe() has the difficult job of finding a drive if it exists,
2179 * without getting hung up if it doesn't exist, without trampling on
2180 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2181 *
2182 * If a drive is "known" to exist (from CMOS or kernel parameters),
2183 * but does not respond right away, the probe will "hang in there"
2184 * for the maximum wait time (about 30 seconds), otherwise it will
2185 * exit much more quickly.
2186 *
2187 * Returns: 0 device was identified
2188 * 1 device timed-out (no response to identify request)
2189 * 2 device aborted the command (refused to identify itself)
2190 * 3 bad status from device (possible for ATAPI drives)
2191 * 4 probe was not attempted because failure was obvious
2192 */
2193 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2194 {
2195 int rc;
2196 #ifdef CONFIG_BLK_DEV_IDECD
2197 if (drive->present) { /* avoid waiting for inappropriate probes */
2198 if ((drive->media == cdrom) && (cmd == WIN_IDENTIFY))
2199 return 4;
2200 }
2201 #endif /* CONFIG_BLK_DEV_IDECD */
2202 #ifdef DEBUG
2203 printk("probing for %s: present=%d, type=%s, probetype=%s\n",
2204 drive->name, drive->present, drive->media ? "cdrom":"disk",
2205 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2206 #endif
2207 #if SUPPORT_HT6560B
2208 if (HWIF(drive)->select)
2209 ide_hwif_select (HWIF(drive));
2210 #endif
2211 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2212 delay_10ms(); /* wait for BUSY_STAT */
2213 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2214 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2215 return 3; /* no i/f present: avoid killing ethernet cards */
2216 }
2217
2218 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2219 || drive->present || cmd == WIN_PIDENTIFY)
2220 {
2221 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2222 rc = try_to_identify(drive,cmd); /* failed: try again */
2223 if (rc == 1)
2224 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2225 (void) GET_STAT(); /* ensure drive irq is clear */
2226 } else {
2227 rc = 3; /* not present or maybe ATAPI */
2228 }
2229 if (drive->select.b.unit != 0) {
2230 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2231 delay_10ms();
2232 (void) GET_STAT(); /* ensure drive irq is clear */
2233 }
2234 return rc;
2235 }
2236
2237 /*
2238 * probe_for_drive() tests for existance of a given drive using do_probe().
2239 *
2240 * Returns: 0 no device was found
2241 * 1 device was found (note: drive->present might still be 0)
2242 */
2243 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2244 {
2245 if (drive->noprobe) /* skip probing? */
2246 return drive->present;
2247 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2248 #ifdef CONFIG_BLK_DEV_IDECD
2249 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2250 #endif /* CONFIG_BLK_DEV_IDECD */
2251 }
2252 if (!drive->present)
2253 return 0; /* drive not found */
2254 if (drive->id == NULL) { /* identification failed? */
2255 if (drive->media == disk) {
2256 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2257 drive->name, drive->cyl, drive->head, drive->sect);
2258 }
2259 #ifdef CONFIG_BLK_DEV_IDECD
2260 else if (drive->media == cdrom) {
2261 printk("%s: ATAPI cdrom (?)\n", drive->name);
2262 }
2263 #endif /* CONFIG_BLK_DEV_IDECD */
2264 else {
2265 drive->present = 0; /* nuke it */
2266 return 1; /* drive was found */
2267 }
2268 }
2269 if (drive->media == disk && !drive->select.b.lba) {
2270 if (!drive->head || drive->head > 16) {
2271 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2272 drive->name, drive->head);
2273 drive->present = 0;
2274 }
2275 }
2276 return 1; /* drive was found */
2277 }
2278
2279 /*
2280 * This routine only knows how to look for drive units 0 and 1
2281 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2282 */
2283 static void probe_for_drives (ide_hwif_t *hwif)
/* */
2284 {
2285 unsigned int unit;
2286
2287 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2288 int msgout = 0;
2289 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2290 ide_drive_t *drive = &hwif->drives[unit];
2291 if (drive->present) {
2292 drive->present = 0;
2293 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2294 msgout = 1;
2295 }
2296 }
2297 if (!msgout)
2298 printk("%s: ports already in use, skipping probe\n", hwif->name);
2299 } else {
2300 unsigned long flags;
2301 save_flags(flags);
2302
2303 #if (MAX_DRIVES > 2)
2304 printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2305 #endif
2306 sti(); /* needed for jiffies and irq probing */
2307 /*
2308 * Second drive should only exist if first drive was found,
2309 * but a lot of cdrom drives seem to be configured as slave-only
2310 */
2311 for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2312 ide_drive_t *drive = &hwif->drives[unit];
2313 (void) probe_for_drive (drive);
2314 #ifdef CONFIG_BLK_DEV_IDECD
2315 if (drive->present && drive->media == cdrom)
2316 ide_cdrom_setup(drive);
2317 #endif /* CONFIG_BLK_DEV_IDECD */
2318 }
2319 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2320 ide_drive_t *drive = &hwif->drives[unit];
2321 if (drive->present) {
2322 hwif->present = 1;
2323 request_region(hwif->io_base, 8, hwif->name);
2324 request_region(hwif->ctl_port, 1, hwif->name);
2325 break;
2326 }
2327 }
2328 restore_flags(flags);
2329 }
2330 }
2331
2332 #if SUPPORT_DTC2278
2333 /*
2334 * From: andy@cercle.cts.com (Dyan Wile)
2335 *
2336 * Below is a patch for DTC-2278 - alike software-programmable controllers
2337 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
2338 * the primary (EIDE). You may probably have to enable the 32-bit support to
2339 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
2340 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
2341 * filesystem corrupted with -u1, but under heavy disk load only :-)
2342 *
2343 * From: mlord@bnr.ca -- this chipset is now forced to use the "serialize" feature,
2344 * which hopefully will make it more reliable to use.. maybe it has the same bugs
2345 * as the CMD640B and RZ1000 ??
2346 */
2347
2348 #if SET_DTC2278_MODE4
2349 static void sub22 (char b, char c)
/* */
2350 {
2351 int i;
2352
2353 for(i = 0; i < 3; ++i) {
2354 inb(0x3f6);
2355 outb_p(b,0xb0);
2356 inb(0x3f6);
2357 outb_p(c,0xb4);
2358 inb(0x3f6);
2359 if(inb(0xb4) == c) {
2360 outb_p(7,0xb0);
2361 inb(0x3f6);
2362 return; /* success */
2363 }
2364 }
2365 }
2366 #endif /* SET_DTC2278_MODE4 */
2367
2368 static void init_dtc2278 (void)
/* */
2369 {
2370 cli();
2371 #if SET_DTC2278_MODE4
2372 /*
2373 * This enables PIO mode4 (3?) on the first interface
2374 */
2375 sub22(1,0xc3);
2376 sub22(0,0xa0);
2377 #endif /* SET_DTC2278_MODE4 */
2378 /*
2379 * This enables the second interface
2380 */
2381 outb_p(4,0xb0);
2382 inb(0x3f6);
2383 outb_p(0x20,0xb4);
2384 inb(0x3f6);
2385
2386 sti();
2387 }
2388 #endif /* SUPPORT_DTC2278 */
2389
2390 #if SUPPORT_CMD640
2391 /*
2392 * ??? fixme:
2393 */
2394 byte read_cmd640_vlb (byte port, byte reg)
/* */
2395 {
2396 byte val;
2397
2398 unsigned long flags;
2399 save_flags(flags);
2400 cli();
2401 outw(reg, port);
2402 val = inb(port+4);
2403 restore_flags(flags);
2404 return val;
2405 }
2406
2407 void write_cmd640_vlb (byte port, byte reg, byte val)
/* */
2408 {
2409 unsigned long flags;
2410 save_flags(flags);
2411 cli();
2412 outw(reg, port);
2413 outw(val, port+4);
2414 restore_flags(flags);
2415 }
2416
2417 void init_cmd640_vlb (void)
/* */
2418 {
2419 byte reg;
2420 unsigned short port = 0x178;
2421
2422 single_threaded = 1;
2423 printk("ide: buggy CMD640 interface: serialized, ");
2424 reg = read_cmd640_vlb(port, 0x50);
2425 if (reg == 0xff || (reg & 0x90) != 0x90) {
2426 #if TRY_CMD640_VLB_AT_0x78
2427 port = 0x78;
2428 if (reg == 0xff || (reg & 0x90) != 0x90)
2429 #endif
2430 {
2431 disallow_unmask = 1;
2432 printk("(probe failed) disabled unmasking\n");
2433 return;
2434 }
2435 }
2436 write_cmd640_vlb(port, 0x51, read_cmd640_vlb(port, 0x51)|0xc8);
2437 write_cmd640_vlb(port, 0x57, read_cmd640_vlb(port, 0x57)|0x0c);
2438 printk("disabled read-ahead, enabled secondary\n");
2439
2440 }
2441 #endif /* SUPPORT_CMD640 */
2442
2443 /*
2444 * stridx() returns the offset of c within s,
2445 * or -1 if c is '\0' or not found within s.
2446 */
2447 static int stridx (const char *s, char c)
/* */
2448 {
2449 char *i = strchr(s, c);
2450 return (i && c) ? i - s : -1;
2451 }
2452
2453 /*
2454 * match_parm() does parsing for ide_setup():
2455 *
2456 * 1. the first char of s must be '='.
2457 * 2. if the remainder matches one of the supplied keywords,
2458 * the index (1 based) of the keyword is negated and returned.
2459 * 3. if the remainder is a series of no more than max_vals numbers
2460 * separated by commas, the numbers are saved in vals[] and a
2461 * count of how many were saved is returned. Base10 is assumed,
2462 * and base16 is allowed when prefixed with "0x".
2463 * 4. otherwise, zero is returned.
2464 */
2465 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2466 {
2467 static const char *decimal = "0123456789";
2468 static const char *hex = "0123456789abcdef";
2469 int i, n;
2470
2471 if (*s++ == '=') {
2472 /*
2473 * Try matching against the supplied keywords,
2474 * and return -(index+1) if we match one
2475 */
2476 for (i = 0; *keywords != NULL; ++i) {
2477 if (!strcmp(s, *keywords++))
2478 return -(i+1);
2479 }
2480 /*
2481 * Look for a series of no more than "max_vals"
2482 * numeric values separated by commas, in base10,
2483 * or base16 when prefixed with "0x".
2484 * Return a count of how many were found.
2485 */
2486 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2487 vals[n] = i;
2488 while ((i = stridx(decimal, *++s)) >= 0)
2489 vals[n] = (vals[n] * 10) + i;
2490 if (*s == 'x' && !vals[n]) {
2491 while ((i = stridx(hex, *++s)) >= 0)
2492 vals[n] = (vals[n] * 0x10) + i;
2493 }
2494 if (++n == max_vals)
2495 break;
2496 if (*s == ',')
2497 ++s;
2498 }
2499 if (!*s)
2500 return n;
2501 }
2502 return 0; /* zero = nothing matched */
2503 }
2504
2505 /*
2506 * ide_setup() gets called VERY EARLY during initialization,
2507 * to handle kernel "command line" strings beginning with "hdx="
2508 * or "ide". Here is the complete set currently supported:
2509 *
2510 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2511 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2512 *
2513 * "hdx=noprobe" : drive may be present, but do not probe for it
2514 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2515 * "hdx=cdrom" : drive is present, and is a cdrom drive
2516 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2517 *
2518 * "idex=noprobe" : do not attempt to access/use this interface
2519 * "idex=base" : probe for an interface at the addr specified,
2520 * where "base" is usually 0x1f0 or 0x170
2521 * and "ctl" is assumed to be "base"+0x206
2522 * "idex=base,ctl" : specify both base and ctl
2523 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2524 *
2525 * The following two are valid ONLY on ide0 or ide1,
2526 * and the defaults for the base,ctl ports must not be altered.
2527 *
2528 * "idex=serialize" : do not overlap operations on ide0 and ide1.
2529 * "idex=dtc2278" : enables use of DTC2278 secondary i/f
2530 * "idex=ht6560b" : enables use of HT6560B secondary i/f
2531 * "idex=cmd640_vlb" : required for VLB cards with the CMD640 chip
2532 * (PCI version will be automatically detected)
2533 */
2534 void ide_setup (char *s)
/* */
2535 {
2536 int vals[3];
2537 ide_hwif_t *hwif;
2538 ide_drive_t *drive;
2539 unsigned int hw, unit;
2540 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2541 const char max_hwif = '0' + (MAX_HWIFS - 1);
2542
2543 printk("ide_setup: %s", s);
2544 init_ide_data ();
2545
2546 /*
2547 * Look for drive options: "hdx="
2548 */
2549 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2550 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize", NULL};
2551 unit = s[2] - 'a';
2552 hw = unit / MAX_DRIVES;
2553 unit = unit % MAX_DRIVES;
2554 hwif = &ide_hwifs[hw];
2555 drive = &hwif->drives[unit];
2556 switch (match_parm(&s[3], hd_words, vals, 3)) {
2557 case -1: /* "noprobe" */
2558 drive->noprobe = 1;
2559 goto done;
2560 case -2: /* "nowerr" */
2561 drive->bad_wstat = BAD_R_STAT;
2562 hwif->noprobe = 0;
2563 goto done;
2564 case -3: /* "cdrom" */
2565 drive->present = 1;
2566 drive->media = cdrom;
2567 hwif->noprobe = 0;
2568 goto done;
2569 case -4: /* "serialize" */
2570 printk(" -- USE ""ide%c=serialize"" INSTEAD", '0'+hw);
2571 goto do_serialize;
2572 case 3: /* cyl,head,sect */
2573 drive->media = disk;
2574 drive->cyl = drive->bios_cyl = vals[0];
2575 drive->head = drive->bios_head = vals[1];
2576 drive->sect = drive->bios_sect = vals[2];
2577 drive->present = 1;
2578 hwif->noprobe = 0;
2579 goto done;
2580 default:
2581 goto bad_option;
2582 }
2583 }
2584 /*
2585 * Look for interface options: "idex="
2586 */
2587 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2588 const char *ide_words[] = {"noprobe", "serialize", "dtc2278", "ht6560b", "cmd640_vlb", NULL};
2589 hw = s[3] - '0';
2590 hwif = &ide_hwifs[hw];
2591
2592 switch (match_parm(&s[4], ide_words, vals, 3)) {
2593 #if SUPPORT_CMD640
2594 case -5: /* "cmd640_vlb" */
2595 if (hw > 1) goto bad_hwif;
2596 init_cmd640_vlb();
2597 goto do_serialize; /* not necessary once we implement the above */
2598 break;
2599 #endif /* SUPPORT_CMD640 */
2600 #if SUPPORT_HT6560B
2601 case -4: /* "ht6560b" */
2602 if (hw > 1) goto bad_hwif;
2603 /*
2604 * Using 0x1c and 0x1d apparently selects a
2605 * faster interface speed than 0x3c and 0x3d.
2606 *
2607 * Need to add an ioctl to select between them.
2608 */
2609 if (check_region(0x3e6,1)) {
2610 printk(" -- HT6560 PORT 0x3e6 ALREADY IN USE");
2611 goto done;
2612 }
2613 request_region(0x3e6, 1, hwif->name);
2614 ide_hwifs[0].select = 0x3c;
2615 ide_hwifs[1].select = 0x3d;
2616 goto do_serialize;
2617 #endif /* SUPPORT_HT6560B */
2618 #if SUPPORT_DTC2278
2619 case -3: /* "dtc2278" */
2620 if (hw > 1) goto bad_hwif;
2621 init_dtc2278();
2622 goto do_serialize;
2623 #endif /* SUPPORT_DTC2278 */
2624 case -2: /* "serialize" */
2625 do_serialize:
2626 if (hw > 1) goto bad_hwif;
2627 single_threaded = 1;
2628 goto done;
2629 case -1: /* "noprobe" */
2630 hwif->noprobe = 1;
2631 goto done;
2632 case 1: /* base */
2633 vals[1] = vals[0] + 0x206; /* default ctl */
2634 case 2: /* base,ctl */
2635 vals[2] = 0; /* default irq = probe for it */
2636 case 3: /* base,ctl,irq */
2637 hwif->io_base = vals[0];
2638 hwif->ctl_port = vals[1];
2639 hwif->irq = vals[2];
2640 hwif->noprobe = 0;
2641 goto done;
2642 }
2643 }
2644 bad_option:
2645 printk(" -- BAD OPTION\n");
2646 return;
2647 bad_hwif:
2648 printk("-- NOT SUPPORTED ON ide%d", hw);
2649 done:
2650 printk("\n");
2651 }
2652
2653 /*
2654 * This routine is called from the partition-table code in genhd.c
2655 * to "convert" a drive to a logical geometry with fewer than 1024 cyls
2656 * It mimics the method used by Ontrack Disk Manager.
2657 */
2658 int ide_xlate_1024 (kdev_t i_rdev, int offset, const char *msg)
/* */
2659 {
2660 ide_drive_t *drive;
2661 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2662 const byte *heads = head_vals;
2663 unsigned long tracks;
2664
2665 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->id == NULL)
2666 return 0;
2667
2668 drive->cyl = drive->bios_cyl = drive->id->cyls;
2669 drive->head = drive->bios_head = drive->id->heads;
2670 drive->sect = drive->bios_sect = drive->id->sectors;
2671 drive->special.b.set_geometry = 1;
2672
2673 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2674 drive->bios_sect = 63;
2675 while (drive->bios_cyl >= 1024) {
2676 drive->bios_head = *heads;
2677 drive->bios_cyl = tracks / drive->bios_head;
2678 if (0 == *++heads)
2679 break;
2680 }
2681 if (offset) {
2682 #if FAKE_FDISK_FOR_EZDRIVE
2683 if (offset == -1)
2684 drive->ezdrive = 1;
2685 else
2686 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2687 {
2688 drive->sect0 = 63;
2689 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2690 }
2691 }
2692 drive->part[0].nr_sects = current_capacity(drive);
2693 printk("%s [%d/%d/%d]", msg, drive->bios_cyl, drive->bios_head, drive->bios_sect);
2694 return 1;
2695 }
2696
2697 /*
2698 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2699 * controller that is BIOS compatible with ST-506, and thus showing up in our
2700 * BIOS table, but not register compatible, and therefore not present in CMOS.
2701 *
2702 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2703 * drives in the system -- the ones reflected as drive 1 or 2. The first
2704 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2705 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2706 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2707 * means we have an AT controller hard disk for that drive.
2708 *
2709 * Of course, there is no guarantee that either drive is actually on the
2710 * "primary" IDE interface, but we don't bother trying to sort that out here.
2711 * If a drive is not actually on the primary interface, then these parameters
2712 * will be ignored. This results in the user having to supply the logical
2713 * drive geometry as a boot parameter for each drive not on the primary i/f.
2714 *
2715 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2716 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2717 * for us during initialization. I have the necessary docs -- any takers? -ml
2718 */
2719
2720 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2721 {
2722 #ifdef __i386__
2723 extern struct drive_info_struct drive_info;
2724 byte cmos_disks, *BIOS = (byte *) &drive_info;
2725 int unit;
2726
2727 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2728 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2729 /* Extract drive geometry from CMOS+BIOS if not already setup */
2730 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2731 ide_drive_t *drive = &hwif->drives[unit];
2732 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2733 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2734 drive->head = drive->bios_head = *(BIOS+2);
2735 drive->sect = drive->bios_sect = *(BIOS+14);
2736 drive->ctl = *(BIOS+8);
2737 drive->present = 1;
2738 }
2739 BIOS += 16;
2740 }
2741 #endif
2742 }
2743
2744 /*
2745 * This routine sets up the irq for an ide interface, and creates a new
2746 * hwgroup for the irq/hwif if none was previously assigned.
2747 *
2748 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2749 * interrupts completely disabled. This can be bad for interrupt latency,
2750 * but anything else has led to problems on some machines. We re-enable
2751 * interrupts as much as we can safely do in most places.
2752 */
2753 static int init_irq (ide_hwif_t *hwif)
/* */
2754 {
2755 unsigned long flags;
2756 ide_hwgroup_t *hwgroup;
2757
2758 /*
2759 * First, we try to grab the irq
2760 */
2761 save_flags(flags);
2762 cli();
2763 if (request_irq(hwif->irq, ide_intr,
2764 SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2765 restore_flags(flags);
2766 printk(" -- FAILED!");
2767 return 1;
2768 }
2769
2770 /*
2771 * Got the irq, now set everything else up
2772 */
2773 if ((hwgroup = irq_to_hwgroup[hwif->irq]) == NULL) {
2774 hwgroup = ide_alloc (sizeof(ide_hwgroup_t), 0);
2775 irq_to_hwgroup[hwif->irq] = hwgroup;
2776 hwgroup->hwif = hwif->next = hwif;
2777 hwgroup->rq = NULL;
2778 hwgroup->handler = NULL;
2779 hwgroup->drive = NULL;
2780 hwgroup->reset_timeout = 0;
2781 #ifdef CONFIG_BLK_DEV_IDECD
2782 hwgroup->doing_atapi_reset = 0;
2783 #endif /* CONFIG_BLK_DEV_IDECD */
2784 init_timer(&hwgroup->timer);
2785 hwgroup->timer.function = &timer_expiry;
2786 hwgroup->timer.data = (unsigned long) hwgroup;
2787 } else {
2788 hwif->next = hwgroup->hwif->next;
2789 hwgroup->hwif->next = hwif;
2790 }
2791 hwif->hwgroup = hwgroup;
2792
2793 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2794
2795 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2796 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
2797 if (hwgroup->hwif != hwif) {
2798 char *name = hwgroup->hwif->name;
2799 if (hwgroup->hwif->irq == hwif->irq)
2800 printk(" (shared with %s)", name);
2801 else
2802 printk(" (serialized with %s)", name);
2803 }
2804 printk("\n");
2805 return 0;
2806 }
2807
2808 static struct file_operations ide_fops = {
2809 NULL, /* lseek - default */
2810 block_read, /* read - general block-dev read */
2811 block_write, /* write - general block-dev write */
2812 NULL, /* readdir - bad */
2813 NULL, /* select */
2814 ide_ioctl, /* ioctl */
2815 NULL, /* mmap */
2816 ide_open, /* open */
2817 ide_release, /* release */
2818 block_fsync /* fsync */
2819 ,NULL, /* fasync */
2820 ide_check_media_change, /* check_media_change */
2821 revalidate_disk /* revalidate */
2822 };
2823
2824 #ifdef CONFIG_PCI
2825
2826 void ide_pci_access_error (int rc)
/* */
2827 {
2828 printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
2829 }
2830
2831 #if SUPPORT_RZ1000 || SUPPORT_CMD640
2832 void buggy_interface_fallback (int rc)
/* */
2833 {
2834 ide_pci_access_error (rc);
2835 single_threaded = 1;
2836 disallow_unmask = 1;
2837 printk("serialized, disabled unmasking\n");
2838 }
2839 #endif /* SUPPORT_RZ1000 || SUPPORT_CMD640 */
2840
2841 #if SUPPORT_RZ1000
2842 void init_rz1000 (byte bus, byte fn)
/* */
2843 {
2844 int rc;
2845 unsigned short reg;
2846
2847 printk("ide: buggy RZ1000 interface: ");
2848 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, ®))) {
2849 ide_pci_access_error (rc);
2850 } else if (!(reg & 1)) {
2851 printk("not enabled\n");
2852 } else {
2853 if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
2854 || (rc = pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
2855 buggy_interface_fallback (rc);
2856 else
2857 printk("disabled read-ahead\n");
2858 }
2859 }
2860 #endif /* SUPPORT_RZ1000 */
2861
2862 #if SUPPORT_CMD640
2863 void init_cmd640 (byte bus, byte fn)
/* */
2864 {
2865 int rc;
2866 unsigned char reg;
2867
2868 single_threaded = 1;
2869 printk("ide: buggy CMD640 interface: ");
2870
2871 #if 0 /* funny.. the cmd640b I tried this on claimed to not be enabled.. */
2872 unsigned short sreg;
2873 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &sreg))) {
2874 ide_pci_access_error (rc);
2875 } else if (!(sreg & 1)) {
2876 printk("not enabled\n");
2877 } else {
2878 #endif /* 0 */
2879
2880 /*
2881 * The first part is undocumented magic from the DOS driver.
2882 * According to the datasheet, there is no port 0x5b on the cmd640.
2883 */
2884 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0xbd);
2885 if (pcibios_write_config_byte(bus, fn, 0x5b, 0xbd) != 0xbd)
2886 printk("init_cmd640: huh? 0x5b read back wrong\n");
2887 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0);
2888 /*
2889 * The rest is from the cmd640b datasheet.
2890 */
2891 if ((rc = pcibios_read_config_byte(bus, fn, 0x51, ®))
2892 || (rc = pcibios_write_config_byte(bus, fn, 0x51, reg | 0xc0)) /* 0xc8 to enable 2nd i/f */
2893 || (rc = pcibios_read_config_byte(bus, fn, 0x57, ®))
2894 || (rc = pcibios_write_config_byte(bus, fn, 0x57, reg | 0x0c)))
2895 buggy_interface_fallback (rc);
2896 else
2897 printk("serialized, disabled read-ahead\n");
2898 }
2899 #endif /* SUPPORT_CMD640 */
2900
2901 typedef void (ide_pci_init_proc_t)(byte, byte);
2902
2903 /*
2904 * ide_probe_pci() scans PCI for a specific vendor/device function,
2905 * and invokes the supplied init routine for each instance detected.
2906 */
2907 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init)
/* */
2908 {
2909 unsigned long flags;
2910 unsigned index;
2911 byte fn, bus;
2912
2913 save_flags(flags);
2914 cli();
2915 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2916 init (bus, fn);
2917 }
2918 restore_flags(flags);
2919 }
2920
2921 /*
2922 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2923 *
2924 * This routine should ideally be using pcibios_find_class() to find
2925 * all IDE interfaces, but that function causes some systems to "go weird".
2926 */
2927 static void ide_init_pci (void)
/* */
2928 {
2929 #if SUPPORT_RZ1000
2930 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000);
2931 #endif
2932 #if SUPPORT_CMD640
2933 ide_probe_pci (PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_CMD_640, &init_cmd640);
2934 #endif
2935 #ifdef CONFIG_BLK_DEV_TRITON
2936 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_1, &ide_init_triton);
2937 #endif
2938 }
2939 #endif /* CONFIG_PCI */
2940
2941 /*
2942 * This is gets invoked once during initialization, to set *everything* up
2943 */
2944 unsigned long ide_init (unsigned long mem_start, unsigned long mem_end)
/* ![[last]](../icons/n_last.png)
*/
2945 {
2946 int h;
2947
2948 ide_mem_start = mem_start; /* for ide_alloc () */
2949 init_ide_data ();
2950 /*
2951 * First, we determine what hardware is present
2952 */
2953
2954 #ifdef CONFIG_PCI
2955 /*
2956 * Find/initialize PCI IDE interfaces
2957 */
2958 if (pcibios_present())
2959 ide_init_pci ();
2960 #endif /* CONFIG_PCI */
2961
2962 /*
2963 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
2964 */
2965 for (h = 0; h < MAX_HWIFS; ++h) {
2966 ide_hwif_t *hwif = &ide_hwifs[h];
2967 if (!hwif->noprobe) {
2968 if (hwif->io_base == HD_DATA)
2969 probe_cmos_for_drives (hwif);
2970 probe_for_drives (hwif);
2971 }
2972 if (hwif->present) {
2973 if (!hwif->irq) {
2974 if (!(hwif->irq = default_irqs[h])) {
2975 printk("%s: DISABLED, NO IRQ\n", hwif->name);
2976 hwif->present = 0;
2977 continue;
2978 }
2979 }
2980 #ifdef CONFIG_BLK_DEV_HD
2981 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
2982 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
2983 hwif->present = 0;
2984 }
2985 #endif /* CONFIG_BLK_DEV_HD */
2986 }
2987 }
2988
2989 /*
2990 * Now we try to set up irqs and major devices for what was found
2991 */
2992 for (h = MAX_HWIFS-1; h >= 0; --h) {
2993 void (*rfn)(void);
2994 ide_hwif_t *hwif = &ide_hwifs[h];
2995 if (!hwif->present)
2996 continue;
2997 hwif->present = 0; /* we set it back to 1 if all is ok below */
2998 if (h == 0 && single_threaded) {
2999 if (ide_hwifs[1].present) {
3000 if (irq_to_hwgroup[hwif->irq] != NULL) {
3001 printk("%s: SERIALIZE BUG!\n", hwif->name);
3002 continue;
3003 }
3004 irq_to_hwgroup[hwif->irq] = irq_to_hwgroup[ide_hwifs[1].irq];
3005 }
3006 }
3007 switch (hwif->major) {
3008 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3009 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3010 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3011 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3012 default:
3013 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3014 continue;
3015 }
3016 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3017 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3018 } else if (init_irq (hwif)) {
3019 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3020 (void) unregister_blkdev (hwif->major, hwif->name);
3021 } else {
3022 init_gendisk(hwif);
3023 blk_dev[hwif->major].request_fn = rfn;
3024 read_ahead[hwif->major] = 8; /* (4kB) */
3025 hwif->present = 1; /* success */
3026 }
3027 }
3028 mem_start = ide_mem_start;
3029 ide_mem_start = 0uL; /* prevent further use of ide_alloc() */
3030 return mem_start;
3031 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/