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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.16 Oct 19, 1995
3 *
4 * Copyright (C) 1994, 1995 Linus Torvalds & authors (see below)
5 */
6
7 /*
8 * This is the multiple IDE interface driver, as evolved from hd.c.
9 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
10 * There can be up to two drives per interface, as per the ATA-2 spec.
11 *
12 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
13 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
14 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
15 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
16 *
17 * It is easy to extend ide.c to handle more than four interfaces:
18 *
19 * Change the MAX_HWIFS constant in ide.h.
20 *
21 * Define some new major numbers (in major.h), and insert them into
22 * the ide_hwif_to_major table in ide.c.
23 *
24 * Fill in the extra values for the new interfaces into the two tables
25 * inside ide.c: default_io_base[] and default_irqs[].
26 *
27 * Create the new request handlers by cloning "do_ide3_request()"
28 * for each new interface, and add them to the switch statement
29 * in the ide_init() function in ide.c.
30 *
31 * Recompile, create the new /dev/ entries, and it will probably work.
32 *
33 * From hd.c:
34 * |
35 * | It traverses the request-list, using interrupts to jump between functions.
36 * | As nearly all functions can be called within interrupts, we may not sleep.
37 * | Special care is recommended. Have Fun!
38 * |
39 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
40 * |
41 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
42 * | in the early extended-partition checks and added DM partitions.
43 * |
44 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
45 * |
46 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
47 * | and general streamlining by Mark Lord (mlord@bnr.ca).
48 *
49 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
50 *
51 * Mark Lord (mlord@bnr.ca) (IDE Perf.Pkg)
52 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
53 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
54 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
55 *
56 * Maintained by Mark Lord (mlord@bnr.ca): ide.c, ide.h, triton.c, hd.c, ..
57 *
58 * This was a rewrite of just about everything from hd.c, though some original
59 * code is still sprinkled about. Think of it as a major evolution, with
60 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
61 *
62 * Version 1.0 ALPHA initial code, primary i/f working okay
63 * Version 1.3 BETA dual i/f on shared irq tested & working!
64 * Version 1.4 BETA added auto probing for irq(s)
65 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
66 * ...
67 * Version 3.5 correct the bios_cyl field if it's too small
68 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
69 * Version 3.6 cosmetic corrections to comments and stuff
70 * (linux 1.1.77) reorganise probing code to make it understandable
71 * added halfway retry to probing for drive identification
72 * added "hdx=noprobe" command line option
73 * allow setting multmode even when identification fails
74 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
75 * increase DRQ_WAIT to eliminate nuisance messages
76 * wait for DRQ_STAT instead of DATA_READY during probing
77 * (courtesy of Gary Thomas gary@efland.UU.NET)
78 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
79 * update of ide-cd.c from Scott, allows blocksize=1024
80 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
81 * Version 3.9 don't use LBA if lba_capacity looks funny
82 * correct the drive capacity calculations
83 * fix probing for old Seagates without IDE_ALTSTATUS_REG
84 * fix byte-ordering for some NEC cdrom drives
85 * Version 3.10 disable multiple mode by default; was causing trouble
86 * Version 3.11 fix mis-identification of old WD disks as cdroms
87 * Version 3,12 simplify logic for selecting initial mult_count
88 * (fixes problems with buggy WD drives)
89 * Version 3.13 remove excess "multiple mode disabled" messages
90 * Version 3.14 fix ide_error() handling of BUSY_STAT
91 * fix byte-swapped cdrom strings (again.. arghh!)
92 * ignore INDEX bit when checking the ALTSTATUS reg
93 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
94 * ignore WRERR_STAT for non-write operations
95 * added vlb_sync support for DC-2000A & others,
96 * (incl. some Promise chips), courtesy of Frank Gockel
97 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
98 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
99 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
100 * add boot flag to "serialize" operation for CMD i/f
101 * add optional support for DTC2278 interfaces,
102 * courtesy of andy@cercle.cts.com (Dyan Wile).
103 * add boot flag to enable "dtc2278" probe
104 * add probe to avoid EATA (SCSI) interfaces,
105 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
106 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
107 * add flag to ignore WRERR_STAT for some drives
108 * courtesy of David.H.West@um.cc.umich.edu
109 * assembly syntax tweak to vlb_sync
110 * removeable drive support from scuba@cs.tu-berlin.de
111 * add transparent support for DiskManager-6.0x "Dynamic
112 * Disk Overlay" (DDO), most of this in in genhd.c
113 * eliminate "multiple mode turned off" message at boot
114 * Version 4.10 fix bug in ioctl for "hdparm -c3"
115 * fix DM6:DDO support -- now works with LILO, fdisk, ...
116 * don't treat some naughty WD drives as removeable
117 * Version 4.11 updated DM6 support using info provided by OnTrack
118 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
119 * added support for 3rd/4th/alternative IDE ports
120 * created ide.h; ide-cd.c now compiles separate from ide.c
121 * hopefully fixed infinite "unexpected_intr" from cdroms
122 * zillions of other changes and restructuring
123 * somehow reduced overall memory usage by several kB
124 * probably slowed things down slightly, but worth it
125 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
126 * was happening at various times/places: whenever the
127 * ide-interface's ctl_port was used to "mask" the irq,
128 * it also would trigger an edge in the process of masking
129 * which would result in a self-inflicted interrupt!!
130 * (such a stupid way to build a hardware interrupt mask).
131 * This is now fixed (after a year of head-scratching).
132 * Version 5.02 got rid of need for {enable,disable}_irq_list()
133 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
134 * removed PROBE_FOR_IRQS option -- no longer needed
135 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
136 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
137 * added more comments, cleaned up unexpected_intr()
138 * OOOPS! fixed null pointer problem in ide reset code
139 * added autodetect for Triton chipset -- no effect yet
140 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
141 * OOOPS! fixed bug in ide_do_request()
142 * added ATAPI reset sequence for cdroms
143 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
144 * some (mostly) cosmetic changes
145 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
146 * reworked PCI scanning code
147 * added automatic RZ1000 detection/support
148 * added automatic PCI CMD640 detection/support
149 * added option for VLB CMD640 support
150 * tweaked probe to find cdrom on hdb with disks on hda,hdc
151 * Version 5.12 some performance tuning
152 * added message to alert user to bad /dev/hd[cd] entries
153 * OOOPS! fixed bug in atapi reset
154 * driver now forces "serialize" again for all cmd640 chips
155 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
156 * made do_drive_cmd() into public ide_do_drive_cmd()
157 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
158 * fixed ht6560b support
159 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
160 * don't bother invalidating nonexistent partitions
161 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
162 * added & tested full EZ-DRIVE support -- don't use LILO!
163 * don't enable 2nd CMD640 PCI port during init - conflict
164 * Version 5.15 bug fix in init_cmd640_vlb()
165 * bug fix in interrupt sharing code
166 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
167 * remove "Huh?" from cmd640 code
168 * added qd6580 interface speed select from Colten Edwards
169 *
170 * Driver compile-time options are in ide.h
171 *
172 * To do, in likely order of completion:
173 * - add ALI M1443/1445 chipset support from derekn@vw.ece.cmu.edu
174 * - add Promise Caching controller support from peterd@pnd-pc.demon.co.uk
175 * - add ioctls to get/set interface timings on various interfaces
176 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
177 * - improved CMD support: handed this off to someone else
178 * - find someone to work on IDE *tape drive* support
179 */
180
181 #undef REALLY_SLOW_IO /* most systems can safely undef this */
182
183 #include <linux/config.h>
184 #include <linux/types.h>
185 #include <linux/string.h>
186 #include <linux/kernel.h>
187 #include <linux/delay.h>
188 #include <linux/timer.h>
189 #include <linux/mm.h>
190 #include <linux/ioport.h>
191 #include <linux/interrupt.h>
192 #include <linux/major.h>
193 #include <linux/blkdev.h>
194 #include <linux/errno.h>
195 #include <linux/hdreg.h>
196 #include <linux/genhd.h>
197 #include <linux/malloc.h>
198
199 #include <asm/byteorder.h>
200 #include <asm/irq.h>
201 #include <asm/segment.h>
202 #include <asm/io.h>
203
204 #ifdef CONFIG_PCI
205 #include <linux/bios32.h>
206 #include <linux/pci.h>
207 #endif /* CONFIG_PCI */
208
209 #include "ide.h"
210
211 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* hwif info */
212 static ide_hwgroup_t *irq_to_hwgroup [16];
213 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
214
215 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
216 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
217 static int serialized = 0; /* "serialize" option */
218 static int disallow_unmask = 0; /* for buggy hardware */
219
220 #if (DISK_RECOVERY_TIME > 0)
221 /*
222 * For really screwy hardware (hey, at least it *can* be used with Linux)
223 * we can enforce a minimum delay time between successive operations.
224 */
225 static unsigned long read_timer(void)
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*/
226 {
227 unsigned long t, flags;
228 int i;
229
230 save_flags(flags);
231 cli();
232 t = jiffies * 11932;
233 outb_p(0, 0x43);
234 i = inb_p(0x40);
235 i |= inb(0x40) << 8;
236 restore_flags(flags);
237 return (t - i);
238 }
239
240 void ide_set_recovery_timer (ide_hwif_t *hwif)
/* ![[previous]](../icons/left.png)
*/
241 {
242 hwif->last_time = read_timer();
243 }
244 #endif /* DISK_RECOVERY_TIME */
245
246 /*
247 * init_ide_data() sets reasonable default values into all fields
248 * of all instances of the hwifs and drives, but only on the first call.
249 * Subsequent calls have no effect (they don't wipe out anything).
250 *
251 * This routine is normally called at driver initialization time,
252 * but may also be called MUCH earlier during kernel "command-line"
253 * parameter processing. As such, we cannot depend on any other parts
254 * of the kernel (such as memory allocation) to be functioning yet.
255 *
256 * This is too bad, as otherwise we could dynamically allocate the
257 * ide_drive_t structs as needed, rather than always consuming memory
258 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
259 */
260 #define MAGIC_COOKIE 0x12345678
261 static void init_ide_data (void)
/* */
262 {
263 byte *p;
264 unsigned int h, unit;
265 static unsigned long magic_cookie = MAGIC_COOKIE;
266
267 if (magic_cookie != MAGIC_COOKIE)
268 return; /* already initialized */
269 magic_cookie = 0;
270
271 for (h = 0; h < 16; ++h)
272 irq_to_hwgroup[h] = NULL;
273
274 /* bulk initialize hwif & drive info with zeros */
275 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
276 do {
277 *--p = 0;
278 } while (p > (byte *) ide_hwifs);
279
280 for (h = 0; h < MAX_HWIFS; ++h) {
281 ide_hwif_t *hwif = &ide_hwifs[h];
282
283 /* fill in any non-zero initial values */
284 hwif->noprobe = (h > 1);
285 hwif->io_base = default_io_base[h];
286 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
287 #ifdef CONFIG_BLK_DEV_HD
288 if (hwif->io_base == HD_DATA)
289 hwif->noprobe = 1; /* may be overriden by ide_setup() */
290 #endif /* CONFIG_BLK_DEV_HD */
291 hwif->major = ide_hwif_to_major[h];
292 hwif->name[0] = 'i';
293 hwif->name[1] = 'd';
294 hwif->name[2] = 'e';
295 hwif->name[3] = '0' + h;
296
297 for (unit = 0; unit < MAX_DRIVES; ++unit) {
298 ide_drive_t *drive = &hwif->drives[unit];
299
300 /* fill in any non-zero initial values */
301 drive->select.all = (unit<<4)|0xa0;
302 drive->hwif = hwif;
303 drive->ctl = 0x08;
304 drive->ready_stat = READY_STAT;
305 drive->bad_wstat = BAD_W_STAT;
306 drive->special.b.recalibrate = 1;
307 drive->special.b.set_geometry = 1;
308 drive->name[0] = 'h';
309 drive->name[1] = 'd';
310 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
311 }
312 }
313 }
314
315 #define VLB_SYNC 1
316 /*
317 * Some localbus EIDE interfaces require a special access sequence
318 * when using 32-bit I/O instructions to transfer data. We call this
319 * the "vlb_sync" sequence, which consists of three successive reads
320 * of the sector count register location, with interrupts disabled
321 * to ensure that the reads all happen together.
322 */
323 static inline void do_vlb_sync (unsigned short port) {
/* */
324 (void) inb (port);
325 (void) inb (port);
326 (void) inb (port);
327 }
328
329 /*
330 * This is used for most PIO data transfers *from* the IDE interface
331 */
332 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
333 {
334 unsigned short io_base = HWIF(drive)->io_base;
335 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
336
337 if (drive->vlb_32bit) {
338 #ifdef VLB_SYNC
339 if (drive->vlb_sync) {
340 cli();
341 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
342 insl(data_reg, buffer, wcount);
343 if (drive->unmask)
344 sti();
345 } else
346 #endif /* VLB_SYNC */
347 insl(data_reg, buffer, wcount);
348 } else
349 insw(data_reg, buffer, wcount<<1);
350 }
351
352 /*
353 * This is used for most PIO data transfers *to* the IDE interface
354 */
355 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
356 {
357 unsigned short io_base = HWIF(drive)->io_base;
358 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
359
360 if (drive->vlb_32bit) {
361 #ifdef VLB_SYNC
362 if (drive->vlb_sync) {
363 cli();
364 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
365 outsl(data_reg, buffer, wcount);
366 if (drive->unmask)
367 sti();
368 } else
369 #endif /* VLB_SYNC */
370 outsl(data_reg, buffer, wcount);
371 } else
372 outsw(data_reg, buffer, wcount<<1);
373 }
374
375 #if SUPPORT_HT6560B
376 /*
377 * This routine handles interface switching for the peculiar hardware design
378 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
379 * The HT-6560B can only enable one IDE port at a time, and requires a
380 * silly sequence (below) whenever we switch between primary and secondary.
381 *
382 * Apparently, systems with multiple CMD640 chips may need something similar..
383 *
384 * This algorithm courtesy of malafoss@snakemail.hut.fi
385 */
386
387 void ide_hwif_select (ide_hwif_t *hwif)
/* */
388 {
389 static byte current_select = 0;
390
391 if (hwif->select != current_select) {
392 unsigned long flags;
393 save_flags (flags);
394 cli();
395 current_select = hwif->select;
396 (void) inb(0x3e6);
397 (void) inb(0x3e6);
398 (void) inb(0x3e6);
399 (void) inb(0x3e6);
400 outb(current_select,0x3e6);
401 restore_flags (flags);
402 }
403 }
404 #endif /* SUPPORT_HT6560B */
405
406 /*
407 * This should get invoked any time we exit the driver to
408 * wait for an interrupt response from a drive. handler() points
409 * at the appropriate code to handle the next interrupt, and a
410 * timer is started to prevent us from waiting forever in case
411 * something goes wrong (see the timer_expiry() handler later on).
412 */
413 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler)
/* */
414 {
415 ide_hwgroup_t *hwgroup = HWGROUP(drive);
416 #ifdef DEBUG
417 if (hwgroup->handler != NULL)
418 printk("%s: ide_set_handler: old handler not null\n", drive->name);
419 #endif
420 hwgroup->handler = handler;
421 hwgroup->timer.expires = jiffies + WAIT_CMD;
422 add_timer(&(hwgroup->timer));
423 }
424
425 /*
426 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
427 * value for this drive (from its reported identification information).
428 *
429 * Returns: 1 if lba_capacity looks sensible
430 * 0 otherwise
431 */
432 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
433 {
434 unsigned long lba_sects = id->lba_capacity;
435 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
436 unsigned long _10_percent = chs_sects / 10;
437
438 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
439 if ((lba_sects - chs_sects) < _10_percent)
440 return 1; /* lba_capacity is good */
441
442 /* some drives have the word order reversed */
443 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
444 if ((lba_sects - chs_sects) < _10_percent) {
445 id->lba_capacity = lba_sects; /* fix it */
446 return 1; /* lba_capacity is (now) good */
447 }
448 return 0; /* lba_capacity value is bad */
449 }
450
451 /*
452 * current_capacity() returns the capacity (in sectors) of a drive
453 * according to its current geometry/LBA settings.
454 */
455 static unsigned long current_capacity (ide_drive_t *drive)
/* */
456 {
457 struct hd_driveid *id = drive->id;
458 unsigned long capacity;
459
460 if (!drive->present)
461 return 0;
462 if (drive->media != disk)
463 return 0x1fffff; /* cdrom */
464 /* Determine capacity, and use LBA if the drive properly supports it */
465 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
466 drive->select.b.lba = 1;
467 capacity = id->lba_capacity;
468 } else {
469 drive->select.b.lba = 0;
470 capacity = drive->cyl * drive->head * drive->sect;
471 }
472 return (capacity - drive->sect0);
473 }
474
475 /*
476 * ide_geninit() is called exactly *once* for each major, from genhd.c,
477 * at the beginning of the initial partition check for the drives.
478 */
479 static void ide_geninit (struct gendisk *gd)
/* */
480 {
481 unsigned int unit;
482 ide_hwif_t *hwif = gd->real_devices;
483
484 for (unit = 0; unit < gd->nr_real; ++unit) {
485 ide_drive_t *drive = &hwif->drives[unit];
486 #ifdef CONFIG_BLK_DEV_IDECD
487 if (drive->present && drive->media == cdrom)
488 ide_cdrom_setup(drive);
489 #endif /* CONFIG_BLK_DEV_IDECD */
490 drive->part[0].nr_sects = current_capacity(drive);
491 if (!drive->present || drive->media != disk) {
492 drive->part[0].start_sect = -1; /* skip partition check */
493 }
494 }
495 /*
496 * The partition check in genhd.c needs this string to identify
497 * our minor devices by name for display purposes.
498 * Note that doing this will prevent us from working correctly
499 * if ever called a second time for this major (never happens).
500 */
501 gd->real_devices = hwif->drives[0].name; /* name of first drive */
502 }
503
504 /*
505 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
506 * after probing for drives, to allocate partition tables and other data
507 * structures needed for the routines in genhd.c. ide_geninit() gets called
508 * somewhat later, during the partition check.
509 */
510 static void init_gendisk (ide_hwif_t *hwif)
/* */
511 {
512 struct gendisk *gd;
513 unsigned int unit, units, minors;
514 int *bs;
515
516 /* figure out maximum drive number on the interface */
517 for (units = MAX_DRIVES; units > 0; --units) {
518 if (hwif->drives[units-1].present)
519 break;
520 }
521 minors = units * (1<<PARTN_BITS);
522 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
523 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
524 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
525 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
526
527 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
528 blksize_size[hwif->major] = bs;
529 for (unit = 0; unit < minors; ++unit)
530 *bs++ = BLOCK_SIZE;
531
532 for (unit = 0; unit < units; ++unit)
533 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
534
535 gd->major = hwif->major; /* our major device number */
536 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
537 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
538 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
539 gd->max_nr = units; /* max num real drives */
540 gd->nr_real = units; /* current num real drives */
541 gd->init = ide_geninit; /* initialization function */
542 gd->real_devices= hwif; /* ptr to internal data */
543
544 gd->next = gendisk_head; /* link new major into list */
545 hwif->gd = gendisk_head = gd;
546 }
547
548 static void unexpected_intr (int, ide_hwgroup_t *);
549 /*
550 * reset_ihandler() is a dummy interrupt handler which we install during
551 * an ide interface reset operation. This prevents other devices in the
552 * same hwgroup from being serviced while we play around with shared resources.
553 * If it ever gets invoked, we call unexpected_intr(), which treats the event
554 * the same as a timer_expiry().
555 */
556 static void reset_ihandler (ide_drive_t *drive)
/* */
557 {
558 unsigned long flags;
559
560 save_flags(flags);
561 cli();
562 unexpected_intr (HWIF(drive)->irq, HWGROUP(drive));
563 restore_flags(flags);
564 }
565
566 /*
567 * start_reset_timer() sets up a timer event for 50ms in the future,
568 * to poll for completion of an ide reset operation (no interrupt to help us).
569 */
570 static void start_reset_timer (ide_hwif_t *hwif)
/* */
571 {
572 ide_hwgroup_t *hwgroup = hwif->hwgroup;
573
574 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE; /* max waiting time */
575 hwgroup->handler = &reset_ihandler; /* dummy irq handler */
576 hwgroup->timer.expires = jiffies + (HZ/20); /* polling interval */
577 add_timer(&(hwgroup->timer));
578 }
579
580 #ifdef CONFIG_BLK_DEV_IDECD
581 /*
582 * atapi_reset_handler() gets invoked to poll the interface for completion every 50ms
583 * during an atapi drive reset operation. If the drive has not yet responded,
584 * and we have not yet hit our maximum waiting time, then the timer is restarted
585 * for another 50ms.
586 *
587 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
588 */
589 static int atapi_reset_handler (ide_hwgroup_t *hwgroup)
/* */
590 {
591 ide_hwif_t *hwif = hwgroup->hwif;
592 ide_drive_t *drive = hwgroup->drive;
593 byte stat;
594
595 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
596 udelay (10);
597
598 if (!OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
599 if (jiffies < hwgroup->reset_timeout) {
600 start_reset_timer (hwif);
601 return 1;
602 }
603 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
604 return ide_do_reset (drive); /* do it the old fashioned way */
605 }
606 hwgroup->doing_atapi_reset = 0;
607 hwgroup->handler = NULL; /* allow new requests to be processed */
608 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
609 printk("%s: ATAPI reset complete\n", drive->name);
610 return 0;
611 }
612 #endif /* CONFIG_BLK_DEV_IDECD */
613
614 /*
615 * reset_handler() gets invoked to poll the interface for completion every 50ms
616 * during an ide reset operation. If the drives have not yet responded,
617 * and we have not yet hit our maximum waiting time, then the timer is restarted
618 * for another 50ms.
619 *
620 * Returns 1 if waiting for another 50ms, returns 0 otherwise.
621 */
622 static int reset_handler (ide_hwgroup_t *hwgroup)
/* */
623 {
624 ide_hwif_t *hwif = hwgroup->hwif;
625 ide_drive_t *drive = hwgroup->drive;
626 byte tmp;
627
628 #ifdef CONFIG_BLK_DEV_IDECD
629 if (hwgroup->doing_atapi_reset)
630 return atapi_reset_handler(hwgroup);
631 #endif /* CONFIG_BLK_DEV_IDECD */
632
633 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
634 if (jiffies < hwgroup->reset_timeout) {
635 start_reset_timer (hwif);
636 return 1;
637 }
638 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
639 } else {
640 printk("%s: reset: ", hwif->name);
641 if ((tmp = GET_ERR()) == 1)
642 printk("success\n");
643 else {
644 printk("master: ");
645 switch (tmp & 0x7f) {
646 case 1: printk("passed");
647 break;
648 case 2: printk("formatter device error");
649 break;
650 case 3: printk("sector buffer error");
651 break;
652 case 4: printk("ECC circuitry error");
653 break;
654 case 5: printk("controlling MPU error");
655 break;
656 default:printk("error (0x%02x?)", tmp);
657 }
658 if (tmp & 0x80)
659 printk("; slave: failed");
660 printk("\n");
661 }
662 }
663 hwgroup->handler = NULL; /* allow new requests to be processed */
664 hwgroup->reset_timeout = 0; /* signal end of ide reset operation */
665 return 0;
666 }
667
668 /*
669 * ide_do_reset() attempts to recover a confused drive by resetting it.
670 * Unfortunately, resetting a disk drive actually resets all devices on
671 * the same interface, so it can really be thought of as resetting the
672 * interface rather than resetting the drive.
673 *
674 * ATAPI devices have their own reset mechanism which allows them to be
675 * individually reset without clobbering other devices on the same interface.
676 *
677 * Unfortunately, the IDE interface does not generate an interrupt to let
678 * us know when the reset operation has finished, so we must poll for this.
679 * Equally poor, though, is the fact that this may a very long time to complete,
680 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
681 * we set a timer to poll at 50ms intervals.
682 */
683 int ide_do_reset (ide_drive_t *drive)
/* */
684 {
685 unsigned int unit;
686 unsigned long flags;
687 ide_hwif_t *hwif = HWIF(drive);
688 ide_hwgroup_t *hwgroup = HWGROUP(drive);
689
690 save_flags(flags);
691 cli(); /* Why ? */
692
693 #ifdef CONFIG_BLK_DEV_IDECD
694 /* For an ATAPI device, first try an ATAPI SRST. */
695 if (drive->media == cdrom) {
696 if (!hwgroup->doing_atapi_reset) {
697 hwgroup->doing_atapi_reset = 1;
698 if (!drive->keep_settings)
699 drive->unmask = 0;
700 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
701 udelay (20);
702 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
703 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
704 start_reset_timer (hwif); /* begin periodic polling */
705 restore_flags (flags);
706 return 1;
707 }
708 }
709 hwgroup->doing_atapi_reset = 0;
710 #endif /* CONFIG_BLK_DEV_IDECD */
711
712 /*
713 * First, reset any device state data we were maintaining
714 * for any of the drives on this interface.
715 */
716 for (unit = 0; unit < MAX_DRIVES; ++unit) {
717 ide_drive_t *rdrive = &hwif->drives[unit];
718 rdrive->special.b.set_geometry = 1;
719 rdrive->special.b.recalibrate = 1;
720 rdrive->special.b.set_multmode = 0;
721 if (OK_TO_RESET_CONTROLLER)
722 rdrive->mult_count = 0;
723 if (!rdrive->keep_settings) {
724 rdrive->mult_req = 0;
725 rdrive->unmask = 0;
726 }
727 if (rdrive->mult_req != rdrive->mult_count)
728 rdrive->special.b.set_multmode = 1;
729 }
730
731 #if OK_TO_RESET_CONTROLLER
732 /*
733 * Note that we also set nIEN while resetting the device,
734 * to mask unwanted interrupts from the interface during the reset.
735 * However, due to the design of PC hardware, this will cause an
736 * immediate interrupt due to the edge transition it produces.
737 * This single interrupt gives us a "fast poll" for drives that
738 * recover from reset very quickly, saving us the first 50ms wait time.
739 */
740 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
741 udelay(5); /* more than enough time */
742 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
743 hwgroup->reset_timeout = jiffies + WAIT_WORSTCASE;
744 start_reset_timer (hwif); /* begin periodic polling */
745 #endif /* OK_TO_RESET_CONTROLLER */
746
747 restore_flags (flags);
748 return OK_TO_RESET_CONTROLLER; /* 1 = we are waiting, 0 = done */
749 }
750
751 /*
752 * Clean up after success/failure of an explicit (ioctl) drive cmd
753 */
754 static void end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
755 {
756 unsigned long flags;
757 struct request *rq = HWGROUP(drive)->rq;
758 byte *args = (byte *) rq->buffer;
759
760 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
761 if (args) {
762 args[0] = stat;
763 args[1] = err;
764 args[2] = IN_BYTE(IDE_NSECTOR_REG);
765 }
766 save_flags(flags);
767 cli();
768 up(rq->sem);
769 HWGROUP(drive)->rq = NULL;
770 restore_flags(flags);
771 }
772
773 /*
774 * Error reporting, in human readable form (luxurious, but a memory hog).
775 */
776 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
777 {
778 unsigned long flags;
779 byte err = 0;
780
781 save_flags (flags);
782 sti();
783 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
784 #if FANCY_STATUS_DUMPS
785 if (drive->media == disk) {
786 printk(" { ");
787 if (stat & BUSY_STAT)
788 printk("Busy ");
789 else {
790 if (stat & READY_STAT) printk("DriveReady ");
791 if (stat & WRERR_STAT) printk("DeviceFault ");
792 if (stat & SEEK_STAT) printk("SeekComplete ");
793 if (stat & DRQ_STAT) printk("DataRequest ");
794 if (stat & ECC_STAT) printk("CorrectedError ");
795 if (stat & INDEX_STAT) printk("Index ");
796 if (stat & ERR_STAT) printk("Error ");
797 }
798 printk("}");
799 }
800 #endif /* FANCY_STATUS_DUMPS */
801 printk("\n");
802 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
803 err = GET_ERR();
804 printk("%s: %s: error=0x%02x", drive->name, msg, err);
805 #if FANCY_STATUS_DUMPS
806 if (drive->media == disk) {
807 printk(" { ");
808 if (err & BBD_ERR) printk("BadSector ");
809 if (err & ECC_ERR) printk("UncorrectableError ");
810 if (err & ID_ERR) printk("SectorIdNotFound ");
811 if (err & ABRT_ERR) printk("DriveStatusError ");
812 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
813 if (err & MARK_ERR) printk("AddrMarkNotFound ");
814 printk("}");
815 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
816 byte cur = IN_BYTE(IDE_SELECT_REG);
817 if (cur & 0x40) { /* using LBA? */
818 printk(", LBAsect=%ld", (unsigned long)
819 ((cur&0xf)<<24)
820 |(IN_BYTE(IDE_HCYL_REG)<<16)
821 |(IN_BYTE(IDE_LCYL_REG)<<8)
822 | IN_BYTE(IDE_SECTOR_REG));
823 } else {
824 printk(", CHS=%d/%d/%d",
825 (IN_BYTE(IDE_HCYL_REG)<<8) +
826 IN_BYTE(IDE_LCYL_REG),
827 cur & 0xf,
828 IN_BYTE(IDE_SECTOR_REG));
829 }
830 if (HWGROUP(drive)->rq)
831 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
832 }
833 }
834 #endif /* FANCY_STATUS_DUMPS */
835 printk("\n");
836 }
837 restore_flags (flags);
838 return err;
839 }
840
841 /*
842 * try_to_flush_leftover_data() is invoked in response to a drive
843 * unexpectedly having its DRQ_STAT bit set. As an alternative to
844 * resetting the drive, this routine tries to clear the condition
845 * by read a sector's worth of data from the drive. Of course,
846 * this may not help if the drive is *waiting* for data from *us*.
847 */
848 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
849 {
850 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
851
852 while (i > 0) {
853 unsigned long buffer[16];
854 unsigned int wcount = (i > 16) ? 16 : i;
855 i -= wcount;
856 ide_input_data (drive, buffer, wcount);
857 }
858 }
859
860 /*
861 * ide_error() takes action based on the error returned by the controller.
862 *
863 * Returns 1 if an ide reset operation has been initiated, in which case
864 * the caller MUST simply return from the driver (through however many levels).
865 * Returns 0 otherwise.
866 */
867 int ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
868 {
869 struct request *rq;
870 byte err;
871
872 err = ide_dump_status(drive, msg, stat);
873 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
874 return 0;
875 if (rq->cmd == IDE_DRIVE_CMD) { /* never retry an explicit DRIVE_CMD */
876 end_drive_cmd(drive, stat, err);
877 return 0;
878 }
879 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
880 rq->errors |= ERROR_RESET;
881 } else {
882 if (drive->media == disk && (stat & ERR_STAT)) {
883 /* err has different meaning on cdrom */
884 if (err & BBD_ERR) /* retries won't help this! */
885 rq->errors = ERROR_MAX;
886 else if (err & TRK0_ERR) /* help it find track zero */
887 rq->errors |= ERROR_RECAL;
888 }
889 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
890 try_to_flush_leftover_data(drive);
891 }
892 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
893 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
894
895 #ifdef CONFIG_BLK_DEV_TRITON
896 if (rq->errors > 3 && drive->using_dma) { /* DMA troubles? */
897 drive->using_dma = 0;
898 printk("%s: DMA disabled\n", drive->name);
899 --rq->errors;
900 return 0;
901 }
902 #endif /* CONFIG_BLK_DEV_TRITON */
903 if (rq->errors >= ERROR_MAX)
904 ide_end_request(0, HWGROUP(drive));
905 else {
906 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
907 ++rq->errors;
908 return ide_do_reset(drive);
909 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
910 drive->special.b.recalibrate = 1;
911 ++rq->errors;
912 }
913 return 0;
914 }
915
916 /*
917 * read_intr() is the handler for disk read/multread interrupts
918 */
919 static void read_intr (ide_drive_t *drive)
/* */
920 {
921 byte stat;
922 int i;
923 unsigned int msect, nsect;
924 struct request *rq;
925
926 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
927 sti();
928 if (!ide_error(drive, "read_intr", stat))
929 IDE_DO_REQUEST;
930 return;
931 }
932 msect = drive->mult_count;
933 read_next:
934 rq = HWGROUP(drive)->rq;
935 if (msect) {
936 if ((nsect = rq->current_nr_sectors) > msect)
937 nsect = msect;
938 msect -= nsect;
939 } else
940 nsect = 1;
941 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
942 #ifdef DEBUG
943 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
944 drive->name, rq->sector, rq->sector+nsect-1,
945 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
946 #endif
947 rq->sector += nsect;
948 rq->buffer += nsect<<9;
949 rq->errors = 0;
950 i = (rq->nr_sectors -= nsect);
951 if ((rq->current_nr_sectors -= nsect) <= 0)
952 ide_end_request(1, HWGROUP(drive));
953 if (i > 0) {
954 if (msect)
955 goto read_next;
956 ide_set_handler (drive, &read_intr);
957 return;
958 }
959 IDE_DO_REQUEST;
960 }
961
962 /*
963 * write_intr() is the handler for disk write interrupts
964 */
965 static void write_intr (ide_drive_t *drive)
/* */
966 {
967 byte stat;
968 int i;
969 struct request *rq = HWGROUP(drive)->rq;
970
971 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
972 #ifdef DEBUG
973 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
974 drive->name, rq->sector, (unsigned long) rq->buffer,
975 rq->nr_sectors-1);
976 #endif
977 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
978 rq->sector++;
979 rq->buffer += 512;
980 rq->errors = 0;
981 i = --rq->nr_sectors;
982 --rq->current_nr_sectors;
983 if (rq->current_nr_sectors <= 0)
984 ide_end_request(1, HWGROUP(drive));
985 if (i > 0) {
986 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
987 ide_set_handler (drive, &write_intr);
988 return;
989 }
990 IDE_DO_REQUEST;
991 return;
992 }
993 }
994 sti();
995 if (!ide_error(drive, "write_intr", stat))
996 IDE_DO_REQUEST;
997 }
998
999 /*
1000 * multwrite() transfers a block of one or more sectors of data to a drive
1001 * as part of a disk multwrite operation.
1002 */
1003 static void multwrite (ide_drive_t *drive)
/* */
1004 {
1005 struct request *rq = &HWGROUP(drive)->wrq;
1006 unsigned int mcount = drive->mult_count;
1007
1008 do {
1009 unsigned int nsect = rq->current_nr_sectors;
1010 if (nsect > mcount)
1011 nsect = mcount;
1012 mcount -= nsect;
1013
1014 ide_output_data(drive, rq->buffer, nsect<<7);
1015 #ifdef DEBUG
1016 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1017 drive->name, rq->sector, (unsigned long) rq->buffer,
1018 nsect, rq->nr_sectors - nsect);
1019 #endif
1020 if ((rq->nr_sectors -= nsect) <= 0)
1021 break;
1022 if ((rq->current_nr_sectors -= nsect) == 0) {
1023 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1024 rq->current_nr_sectors = rq->bh->b_size>>9;
1025 rq->buffer = rq->bh->b_data;
1026 } else {
1027 panic("%s: buffer list corrupted\n", drive->name);
1028 break;
1029 }
1030 } else {
1031 rq->buffer += nsect << 9;
1032 }
1033 } while (mcount);
1034 }
1035
1036 /*
1037 * write_intr() is the handler for disk multwrite interrupts
1038 */
1039 static void multwrite_intr (ide_drive_t *drive)
/* */
1040 {
1041 byte stat;
1042 int i;
1043 struct request *rq = &HWGROUP(drive)->wrq;
1044
1045 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1046 if (stat & DRQ_STAT) {
1047 if (rq->nr_sectors) {
1048 multwrite(drive);
1049 ide_set_handler (drive, &multwrite_intr);
1050 return;
1051 }
1052 } else {
1053 if (!rq->nr_sectors) { /* all done? */
1054 rq = HWGROUP(drive)->rq;
1055 for (i = rq->nr_sectors; i > 0;){
1056 i -= rq->current_nr_sectors;
1057 ide_end_request(1, HWGROUP(drive));
1058 }
1059 IDE_DO_REQUEST;
1060 return;
1061 }
1062 }
1063 }
1064 sti();
1065 if (!ide_error(drive, "multwrite_intr", stat))
1066 IDE_DO_REQUEST;
1067 }
1068
1069 /*
1070 * Issue a simple drive command
1071 * The drive must be selected beforehand.
1072 */
1073 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1074 {
1075 ide_set_handler (drive, handler);
1076 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1077 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1078 OUT_BYTE(cmd,IDE_COMMAND_REG);
1079 }
1080
1081 /*
1082 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1083 */
1084 static void set_multmode_intr (ide_drive_t *drive)
/* */
1085 {
1086 byte stat = GET_STAT();
1087
1088 sti();
1089 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1090 drive->mult_count = drive->mult_req;
1091 } else {
1092 drive->mult_req = drive->mult_count = 0;
1093 drive->special.b.recalibrate = 1;
1094 (void) ide_dump_status(drive, "set_multmode", stat);
1095 }
1096 IDE_DO_REQUEST;
1097 }
1098
1099 /*
1100 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1101 */
1102 static void set_geometry_intr (ide_drive_t *drive)
/* */
1103 {
1104 byte stat = GET_STAT();
1105
1106 sti();
1107 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1108 if (ide_error(drive, "set_geometry_intr", stat))
1109 return;
1110 IDE_DO_REQUEST;
1111 }
1112
1113 /*
1114 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1115 */
1116 static void recal_intr (ide_drive_t *drive)
/* */
1117 {
1118 byte stat = GET_STAT();
1119
1120 sti();
1121 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1122 if (ide_error(drive, "recal_intr", stat))
1123 return;
1124 IDE_DO_REQUEST;
1125 }
1126
1127 /*
1128 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1129 */
1130 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1131 {
1132 byte stat = GET_STAT();
1133
1134 sti();
1135 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1136 end_drive_cmd (drive, stat, GET_ERR());
1137 else if (ide_error(drive, "drive_cmd", stat)) /* calls end_drive_cmd */
1138 return;
1139 IDE_DO_REQUEST;
1140 }
1141
1142 /*
1143 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1144 * commands to a drive. It used to do much more, but has been scaled back
1145 * in recent updates, and could be completely eliminated with a bit more effort.
1146 */
1147 static inline void do_special (ide_drive_t *drive)
/* */
1148 {
1149 special_t *s = &drive->special;
1150 #ifdef DEBUG
1151 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1152 #endif
1153 if (s->b.set_geometry) {
1154 s->b.set_geometry = 0;
1155 if (drive->media == disk) {
1156 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1157 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1158 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1159 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1160 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1161 }
1162 } else if (s->b.recalibrate) {
1163 s->b.recalibrate = 0;
1164 if (drive->media == disk) {
1165 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1166 }
1167 } else if (s->b.set_multmode) {
1168 s->b.set_multmode = 0;
1169 if (drive->media == disk) {
1170 if (drive->id && drive->mult_req > drive->id->max_multsect)
1171 drive->mult_req = drive->id->max_multsect;
1172 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1173 } else
1174 drive->mult_req = 0;
1175 } else if (s->all) {
1176 s->all = 0;
1177 printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1178 }
1179 }
1180
1181 /*
1182 * This routine busy-waits for the drive status to be not "busy".
1183 * It then checks the status for all of the "good" bits and none
1184 * of the "bad" bits, and if all is okay it returns 0. All other
1185 * cases return 1 after invoking ide_error()
1186 *
1187 * This routine should get fixed to not hog the cpu during extra long waits..
1188 * That could be done by busy-waiting for the first jiffy or two, and then
1189 * setting a timer to wake up at half second intervals thereafter,
1190 * until WAIT_WORSTCASE is achieved, before timing out.
1191 */
1192 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1193 {
1194 byte stat;
1195 unsigned long flags;
1196 test:
1197 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1198 if (OK_STAT((stat = GET_STAT()), good, bad))
1199 return 0; /* fast exit for most frequent case */
1200 if (!(stat & BUSY_STAT)) {
1201 (void) ide_error(drive, "status error", stat);
1202 return 1;
1203 }
1204
1205 save_flags(flags);
1206 sti();
1207 timeout += jiffies;
1208 do {
1209 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1210 restore_flags(flags);
1211 goto test;
1212 }
1213 } while (jiffies <= timeout);
1214
1215 restore_flags(flags);
1216 (void) ide_error(drive, "status timeout", GET_STAT());
1217 return 1;
1218 }
1219
1220 /*
1221 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1222 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1223 * care of issuing special DRIVE_CMDs.
1224 */
1225 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1226 {
1227 unsigned short io_base = HWIF(drive)->io_base;
1228
1229 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1230 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1231 if (drive->select.b.lba) {
1232 #ifdef DEBUG
1233 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1234 drive->name, (rq->cmd==READ)?"read":"writ",
1235 block, rq->nr_sectors, (unsigned long) rq->buffer);
1236 #endif
1237 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1238 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1239 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1240 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1241 } else {
1242 unsigned int sect,head,cyl,track;
1243 track = block / drive->sect;
1244 sect = block % drive->sect + 1;
1245 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1246 head = track % drive->head;
1247 cyl = track / drive->head;
1248 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1249 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1250 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1251 #ifdef DEBUG
1252 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1253 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1254 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1255 #endif
1256 }
1257 if (rq->cmd == READ) {
1258 #ifdef CONFIG_BLK_DEV_TRITON
1259 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1260 return;
1261 #endif /* CONFIG_BLK_DEV_TRITON */
1262 ide_set_handler(drive, &read_intr);
1263 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1264 return;
1265 }
1266 if (rq->cmd == WRITE) {
1267 #ifdef CONFIG_BLK_DEV_TRITON
1268 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1269 return;
1270 #endif /* CONFIG_BLK_DEV_TRITON */
1271 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1272 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1273 printk("%s: no DRQ after issuing %s\n", drive->name,
1274 drive->mult_count ? "MULTWRITE" : "WRITE");
1275 return;
1276 }
1277 if (!drive->unmask)
1278 cli();
1279 if (drive->mult_count) {
1280 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1281 ide_set_handler (drive, &multwrite_intr);
1282 multwrite(drive);
1283 } else {
1284 ide_set_handler (drive, &write_intr);
1285 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1286 }
1287 return;
1288 }
1289 if (rq->cmd == IDE_DRIVE_CMD) {
1290 byte *args = rq->buffer;
1291 if (args) {
1292 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1293 drive->name, args[0], args[1], args[2]);
1294 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1295 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1296 return;
1297 } else {
1298 /*
1299 * NULL is actually a valid way of waiting for
1300 * all current requests to be flushed from the queue.
1301 */
1302 #ifdef DEBUG
1303 printk("%s: DRIVE_CMD (null)\n", drive->name);
1304 #endif
1305 end_drive_cmd(drive, GET_STAT(), GET_ERR());
1306 return;
1307 }
1308 }
1309 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1310 ide_end_request(0, HWGROUP(drive));
1311 }
1312
1313 /*
1314 * do_request() initiates handling of a new I/O request
1315 */
1316 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1317 {
1318 unsigned int minor, unit;
1319 unsigned long block, blockend;
1320 ide_drive_t *drive;
1321
1322 sti();
1323 #ifdef DEBUG
1324 printk("%s: ide_do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1325 #endif
1326 minor = MINOR(rq->rq_dev);
1327 unit = minor >> PARTN_BITS;
1328 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1329 printk("%s: bad device number: %s\n",
1330 hwif->name, kdevname(rq->rq_dev));
1331 goto kill_rq;
1332 }
1333 drive = &hwif->drives[unit];
1334 #ifdef DEBUG
1335 if (rq->bh && !rq->bh->b_lock) {
1336 printk("%s: block not locked\n", drive->name);
1337 goto kill_rq;
1338 }
1339 #endif
1340 block = rq->sector;
1341 blockend = block + rq->nr_sectors;
1342 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1343 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1344 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1345 goto kill_rq;
1346 }
1347 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1348 #if FAKE_FDISK_FOR_EZDRIVE
1349 if (block == 0 && drive->ezdrive) {
1350 block = 1;
1351 printk("%s: [EZD] accessing sector 1 instead of sector 0\n", drive->name);
1352 }
1353 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1354 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1355 #if (DISK_RECOVERY_TIME > 0)
1356 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1357 #endif
1358 #if SUPPORT_HT6560B
1359 if (hwif->select)
1360 ide_hwif_select (hwif);
1361 #endif
1362 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1363 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1364 printk("%s: drive not ready for command\n", drive->name);
1365 return;
1366
1367 }
1368 if (!drive->special.all) {
1369 #ifdef CONFIG_BLK_DEV_IDECD
1370 switch (drive->media) {
1371 case disk:
1372 do_rw_disk (drive, rq, block);
1373 return;
1374 case cdrom:
1375 ide_do_rw_cdrom (drive, block);
1376 return;
1377 default:
1378 printk("%s: media type %d not supported\n",
1379 drive->name, drive->media);
1380 goto kill_rq;
1381 }
1382 #else
1383 do_rw_disk (drive, rq, block); /* simpler and faster */
1384 return;
1385 #endif;
1386 }
1387 do_special(drive);
1388 return;
1389 kill_rq:
1390 ide_end_request(0, hwif->hwgroup);
1391 }
1392
1393 /*
1394 * The driver enables interrupts as much as possible. In order to do this,
1395 * (a) the device-interrupt is always masked before entry, and
1396 * (b) the timeout-interrupt is always disabled before entry.
1397 *
1398 * If we enter here from, say irq14, and then start a new request for irq15,
1399 * (possible with "serialize" option) then we cannot ensure that we exit
1400 * before the irq15 hits us. So, we must be careful not to let this bother us.
1401 *
1402 * Interrupts are still masked (by default) whenever we are exchanging
1403 * data/cmds with a drive, because some drives seem to have very poor
1404 * tolerance for latency during I/O. For devices which don't suffer from
1405 * this problem (most don't), the unmask flag can be set using the "hdparm"
1406 * utility, to permit other interrupts during data/cmd transfers.
1407 */
1408 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1409 {
1410 cli(); /* paranoia */
1411 if (hwgroup->handler != NULL) {
1412 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1413 return;
1414 }
1415 do {
1416 ide_hwif_t *hwif = hwgroup->hwif;
1417 struct request *rq;
1418 if ((rq = hwgroup->rq) == NULL) {
1419 hwgroup->drive = NULL; /* paranoia */
1420 do {
1421 rq = blk_dev[hwif->major].current_request;
1422 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1423 goto got_rq;
1424 } while ((hwif = hwif->next) != hwgroup->hwif);
1425 return; /* no work left for this hwgroup */
1426 got_rq:
1427 blk_dev[hwif->major].current_request = rq->next;
1428 }
1429 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1430 cli();
1431 } while (hwgroup->handler == NULL);
1432 }
1433
1434 /*
1435 * do_hwgroup_request() invokes ide_do_request() after first masking
1436 * all possible interrupts for the current hwgroup. This prevents race
1437 * conditions in the event that an unexpected interrupt occurs while
1438 * we are in the driver.
1439 *
1440 * Note that when an interrupt is used to reenter the driver, the first level
1441 * handler will already have masked the irq that triggered, but any other ones
1442 * for the hwgroup will still be unmasked. The driver tries to be careful
1443 * about such things.
1444 */
1445 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1446 {
1447 if (hwgroup->handler == NULL) {
1448 ide_hwif_t *hgif = hwgroup->hwif;
1449 ide_hwif_t *hwif = hgif;
1450 do {
1451 disable_irq(hwif->irq);
1452 } while ((hwif = hwif->next) != hgif);
1453 ide_do_request (hwgroup);
1454 do {
1455 enable_irq(hwif->irq);
1456 } while ((hwif = hwif->next) != hgif);
1457 }
1458 }
1459
1460 static void do_ide0_request (void) /* invoked with cli() */
/* */
1461 {
1462 do_hwgroup_request (ide_hwifs[0].hwgroup);
1463 }
1464
1465 static void do_ide1_request (void) /* invoked with cli() */
/* */
1466 {
1467 do_hwgroup_request (ide_hwifs[1].hwgroup);
1468 }
1469
1470 static void do_ide2_request (void) /* invoked with cli() */
/* */
1471 {
1472 do_hwgroup_request (ide_hwifs[2].hwgroup);
1473 }
1474
1475 static void do_ide3_request (void) /* invoked with cli() */
/* */
1476 {
1477 do_hwgroup_request (ide_hwifs[3].hwgroup);
1478 }
1479
1480 static void timer_expiry (unsigned long data)
/* */
1481 {
1482 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1483 ide_drive_t *drive = hwgroup->drive;
1484 unsigned long flags;
1485
1486 save_flags(flags);
1487 cli();
1488
1489 if (hwgroup->reset_timeout != 0) { /* ide reset in progress? */
1490 if (!reset_handler(hwgroup))
1491 do_hwgroup_request (hwgroup);
1492 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1493 sti(); /* drive must have responded just as the timer expired */
1494 printk("%s: marginal timeout\n", drive->name);
1495 } else { /* drive not responding */
1496 hwgroup->handler = NULL;
1497 if (hwgroup->hwif->dmaproc)
1498 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1499 if (!ide_error(drive, "irq timeout", GET_STAT()))
1500 do_hwgroup_request (hwgroup);
1501 }
1502 restore_flags(flags);
1503 }
1504
1505 /*
1506 * There's nothing really useful we can do with an unexpected interrupt,
1507 * other than reading the status register (to clear it), and logging it.
1508 * There should be no way that an irq can happen before we're ready for it,
1509 * so we needn't worry much about losing an "important" interrupt here.
1510 *
1511 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1512 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1513 * "good", we just ignore the interrupt completely.
1514 *
1515 * This routine assumes cli() is in effect when called.
1516 *
1517 * If an unexpected interrupt happens on irq15 while we are handling irq14
1518 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1519 * we could screw up by interfering with a new request being set up for irq15.
1520 *
1521 * In reality, this is a non-issue. The new command is not sent unless the
1522 * drive is ready to accept one, in which case we know the drive is not
1523 * trying to interrupt us. And ide_set_handler() is always invoked before
1524 * completing the issuance of any new drive command, so we will not be
1525 * accidently invoked as a result of any valid command completion interrupt.
1526 *
1527 */
1528 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1529 {
1530 byte stat;
1531 unsigned int unit;
1532 ide_hwif_t *hwif = hwgroup->hwif;
1533
1534 /*
1535 * check for ide reset in progress
1536 */
1537 if (hwgroup->reset_timeout != 0) {
1538 if (!reset_handler(hwgroup))
1539 do_hwgroup_request (hwgroup);
1540 return;
1541 }
1542
1543 /*
1544 * handle the unexpected interrupt
1545 */
1546 do {
1547 if (hwif->irq == irq) {
1548 #if SUPPORT_HT6560B
1549 if (hwif->select)
1550 ide_hwif_select (hwif);
1551 #endif
1552 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1553 ide_drive_t *drive = &hwif->drives[unit];
1554 if (!drive->present)
1555 continue;
1556 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1557 (void) ide_dump_status(drive, "unexpected_intr", stat);
1558 if ((stat & DRQ_STAT))
1559 try_to_flush_leftover_data(drive);
1560 }
1561 }
1562 } while ((hwif = hwif->next) != hwgroup->hwif);
1563 }
1564
1565 /*
1566 * entry point for all interrupts, caller does cli() for us
1567 */
1568 static void ide_intr (int irq, struct pt_regs *regs)
/* */
1569 {
1570 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1571 ide_handler_t *handler;
1572
1573 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1574 ide_drive_t *drive = hwgroup->drive;
1575 hwgroup->handler = NULL;
1576 del_timer(&(hwgroup->timer));
1577 if (drive->unmask)
1578 sti();
1579 handler(drive);
1580 } else {
1581 unexpected_intr(irq, hwgroup);
1582 }
1583 cli();
1584 }
1585
1586 /*
1587 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1588 * It returns NULL if the given device number does not match any present drives.
1589 */
1590 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1591 {
1592 int major = MAJOR(i_rdev);
1593 unsigned int h;
1594
1595 for (h = 0; h < MAX_HWIFS; ++h) {
1596 ide_hwif_t *hwif = &ide_hwifs[h];
1597 if (hwif->present && major == hwif->major) {
1598 unsigned unit = DEVICE_NR(i_rdev);
1599 if (unit < MAX_DRIVES) {
1600 ide_drive_t *drive = &hwif->drives[unit];
1601 if (drive->present)
1602 return drive;
1603 } else if (major == IDE0_MAJOR && unit < 4) {
1604 printk("ide: probable bad entry for /dev/hd%c%d\n",
1605 'a' + unit, MINOR(i_rdev) & PARTN_MASK);
1606 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1607 }
1608 break;
1609 }
1610 }
1611 return NULL;
1612 }
1613
1614 /*
1615 * This function issues a specific IDE drive command onto the
1616 * tail of the request queue, and waits for it to be completed.
1617 * If arg is NULL, it goes through all the motions,
1618 * but without actually sending a command to the drive.
1619 */
1620 int ide_do_drive_cmd(kdev_t rdev, char *args)
/* */
1621 {
1622 unsigned long flags;
1623 unsigned int major = MAJOR(rdev);
1624 struct request rq, *cur_rq;
1625 struct blk_dev_struct *bdev;
1626 struct semaphore sem = MUTEX_LOCKED;
1627
1628 /* build up a special request, and add it to the queue */
1629 rq.buffer = args;
1630 rq.cmd = IDE_DRIVE_CMD;
1631 rq.errors = 0;
1632 rq.sector = 0;
1633 rq.nr_sectors = 0;
1634 rq.current_nr_sectors = 0;
1635 rq.sem = &sem;
1636 rq.bh = NULL;
1637 rq.bhtail = NULL;
1638 rq.next = NULL;
1639 rq.rq_status = RQ_ACTIVE;
1640 rq.rq_dev = rdev;
1641 bdev = &blk_dev[major];
1642
1643 save_flags(flags);
1644 cli();
1645 cur_rq = bdev->current_request;
1646 if (cur_rq == NULL) { /* empty request list? */
1647 bdev->current_request = &rq; /* service ours immediately */
1648 bdev->request_fn();
1649 } else {
1650 while (cur_rq->next != NULL) /* find end of request list */
1651 cur_rq = cur_rq->next;
1652 cur_rq->next = &rq; /* add rq to the end */
1653 }
1654
1655 down(&sem); /* wait for it to be serviced */
1656 restore_flags(flags);
1657 return rq.errors ? -EIO : 0; /* return -EIO if errors */
1658 }
1659
1660 static int ide_open(struct inode * inode, struct file * filp)
/* */
1661 {
1662 ide_drive_t *drive;
1663 unsigned long flags;
1664
1665 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1666 return -ENODEV;
1667 save_flags(flags);
1668 cli();
1669 while (drive->busy)
1670 sleep_on(&drive->wqueue);
1671 drive->usage++;
1672 restore_flags(flags);
1673 #ifdef CONFIG_BLK_DEV_IDECD
1674 if (drive->media == cdrom)
1675 return ide_cdrom_open (inode, filp, drive);
1676 #endif /* CONFIG_BLK_DEV_IDECD */
1677 if (drive->removeable) {
1678 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1679 check_disk_change(inode->i_rdev);
1680 ide_do_drive_cmd(inode->i_rdev, door_lock);
1681 }
1682 return 0;
1683 }
1684
1685 /*
1686 * Releasing a block device means we sync() it, so that it can safely
1687 * be forgotten about...
1688 */
1689 static void ide_release(struct inode * inode, struct file * file)
/* */
1690 {
1691 ide_drive_t *drive;
1692
1693 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1694 sync_dev(inode->i_rdev);
1695 drive->usage--;
1696 #ifdef CONFIG_BLK_DEV_IDECD
1697 if (drive->media == cdrom)
1698 ide_cdrom_release (inode, file, drive);
1699 else
1700 #endif /* CONFIG_BLK_DEV_IDECD */
1701 if (drive->removeable) {
1702 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1703 invalidate_buffers(inode->i_rdev);
1704 ide_do_drive_cmd(inode->i_rdev, door_unlock);
1705 }
1706 }
1707 }
1708
1709 /*
1710 * This routine is called to flush all partitions and partition tables
1711 * for a changed disk, and then re-read the new partition table.
1712 * If we are revalidating a disk because of a media change, then we
1713 * enter with usage == 0. If we are using an ioctl, we automatically have
1714 * usage == 1 (we need an open channel to use an ioctl :-), so this
1715 * is our limit.
1716 */
1717 static int revalidate_disk(kdev_t i_rdev)
/* */
1718 {
1719 ide_drive_t *drive;
1720 unsigned int p, major, minor;
1721 long flags;
1722
1723 if ((drive = get_info_ptr(i_rdev)) == NULL)
1724 return -ENODEV;
1725
1726 major = MAJOR(i_rdev);
1727 minor = drive->select.b.unit << PARTN_BITS;
1728 save_flags(flags);
1729 cli();
1730 if (drive->busy || (drive->usage > 1)) {
1731 restore_flags(flags);
1732 return -EBUSY;
1733 };
1734 drive->busy = 1;
1735 restore_flags(flags);
1736
1737 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1738 if (drive->part[p].nr_sects > 0) {
1739 kdev_t devp = MKDEV(major, minor+p);
1740 sync_dev (devp);
1741 invalidate_inodes (devp);
1742 invalidate_buffers (devp);
1743 }
1744 drive->part[p].start_sect = 0;
1745 drive->part[p].nr_sects = 0;
1746 };
1747
1748 drive->part[0].nr_sects = current_capacity(drive);
1749 if (drive->media == disk)
1750 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1751
1752 drive->busy = 0;
1753 wake_up(&drive->wqueue);
1754 return 0;
1755 }
1756
1757 static int write_fs_long (unsigned long useraddr, long value)
/* */
1758 {
1759 int err;
1760
1761 if (NULL == (long *)useraddr)
1762 return -EINVAL;
1763 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1764 return err;
1765 put_user((unsigned)value, (long *) useraddr);
1766 return 0;
1767 }
1768
1769 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1770 unsigned int cmd, unsigned long arg)
1771 {
1772 struct hd_geometry *loc = (struct hd_geometry *) arg;
1773 int err;
1774 ide_drive_t *drive;
1775 unsigned long flags;
1776
1777 if (!inode || !(inode->i_rdev))
1778 return -EINVAL;
1779 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1780 return -ENODEV;
1781 switch (cmd) {
1782 case HDIO_GETGEO:
1783 if (!loc || drive->media != disk) return -EINVAL;
1784 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1785 if (err) return err;
1786 put_user(drive->bios_head, (byte *) &loc->heads);
1787 put_user(drive->bios_sect, (byte *) &loc->sectors);
1788 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1789 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1790 (unsigned long *) &loc->start);
1791 return 0;
1792
1793 case BLKFLSBUF:
1794 if(!suser()) return -EACCES;
1795 fsync_dev(inode->i_rdev);
1796 invalidate_buffers(inode->i_rdev);
1797 return 0;
1798
1799 case BLKRASET:
1800 if(!suser()) return -EACCES;
1801 if(arg > 0xff) return -EINVAL;
1802 read_ahead[MAJOR(inode->i_rdev)] = arg;
1803 return 0;
1804
1805 case BLKRAGET:
1806 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1807
1808 case BLKGETSIZE: /* Return device size */
1809 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1810 case BLKRRPART: /* Re-read partition tables */
1811 return revalidate_disk(inode->i_rdev);
1812
1813 case HDIO_GET_KEEPSETTINGS:
1814 return write_fs_long(arg, drive->keep_settings);
1815
1816 case HDIO_GET_UNMASKINTR:
1817 return write_fs_long(arg, drive->unmask);
1818
1819 case HDIO_GET_DMA:
1820 return write_fs_long(arg, drive->using_dma);
1821
1822 case HDIO_GET_CHIPSET:
1823 return write_fs_long(arg, drive->chipset);
1824
1825 case HDIO_GET_MULTCOUNT:
1826 return write_fs_long(arg, drive->mult_count);
1827
1828 case HDIO_GET_IDENTITY:
1829 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1830 return -EINVAL;
1831 if (drive->id == NULL)
1832 return -ENOMSG;
1833 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1834 if (!err)
1835 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1836 return err;
1837
1838 case HDIO_GET_NOWERR:
1839 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1840
1841 case HDIO_SET_DMA:
1842 if (drive->media != disk)
1843 return -EPERM;
1844 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1845 return -EPERM;
1846 case HDIO_SET_KEEPSETTINGS:
1847 case HDIO_SET_UNMASKINTR:
1848 case HDIO_SET_NOWERR:
1849 if (arg > 1)
1850 return -EINVAL;
1851 case HDIO_SET_CHIPSET:
1852 if (!suser())
1853 return -EACCES;
1854 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1855 return -EINVAL;
1856 save_flags(flags);
1857 cli();
1858 switch (cmd) {
1859 case HDIO_SET_DMA:
1860 drive->using_dma = arg;
1861 break;
1862 case HDIO_SET_KEEPSETTINGS:
1863 drive->keep_settings = arg;
1864 break;
1865 case HDIO_SET_UNMASKINTR:
1866 if (arg && disallow_unmask) {
1867 restore_flags(flags);
1868 return -EPERM;
1869 }
1870 drive->unmask = arg;
1871 break;
1872 case HDIO_SET_NOWERR:
1873 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1874 break;
1875 case HDIO_SET_CHIPSET:
1876 drive->chipset = arg;
1877 drive->vlb_32bit = (arg & 1);
1878 drive->vlb_sync = (arg & 2) >> 1;
1879 #ifndef VLB_SYNC
1880 if (drive->vlb_sync)
1881 printk("%s: VLB_SYNC not supported by this kernel\n", drive->name);
1882 #endif
1883 break;
1884 }
1885 restore_flags(flags);
1886 return 0;
1887
1888 case HDIO_SET_MULTCOUNT:
1889 if (!suser())
1890 return -EACCES;
1891 if (MINOR(inode->i_rdev) & PARTN_MASK)
1892 return -EINVAL;
1893 if ((drive->id != NULL) && (arg > drive->id->max_multsect))
1894 return -EINVAL;
1895 save_flags(flags);
1896 cli();
1897 if (drive->special.b.set_multmode) {
1898 restore_flags(flags);
1899 return -EBUSY;
1900 }
1901 drive->mult_req = arg;
1902 drive->special.b.set_multmode = 1;
1903 restore_flags(flags);
1904 ide_do_drive_cmd (inode->i_rdev, NULL);
1905 return (drive->mult_count == arg) ? 0 : -EIO;
1906
1907 case HDIO_DRIVE_CMD:
1908 {
1909 unsigned long args;
1910
1911 if (NULL == (long *) arg)
1912 err = ide_do_drive_cmd(inode->i_rdev,NULL);
1913 else {
1914 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1915 {
1916 args = get_user((long *)arg);
1917 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1918 err = ide_do_drive_cmd(inode->i_rdev,(char *)&args);
1919 put_user(args,(long *)arg);
1920 }
1921 }
1922 }
1923 return err;
1924 }
1925
1926 RO_IOCTLS(inode->i_rdev, arg);
1927
1928 default:
1929 #ifdef CONFIG_BLK_DEV_IDECD
1930 if (drive->media == cdrom)
1931 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
1932 #endif /* CONFIG_BLK_DEV_IDECD */
1933 return -EPERM;
1934 }
1935 }
1936
1937 static int ide_check_media_change (kdev_t i_rdev)
/* */
1938 {
1939 ide_drive_t *drive;
1940
1941 if ((drive = get_info_ptr(i_rdev)) == NULL)
1942 return -ENODEV;
1943 #ifdef CONFIG_BLK_DEV_IDECD
1944 if (drive->media == cdrom)
1945 return ide_cdrom_check_media_change (drive);
1946 #endif /* CONFIG_BLK_DEV_IDECD */
1947 if (drive->removeable) /* for disks */
1948 return 1; /* always assume it was changed */
1949 return 0;
1950 }
1951
1952 static void fixstring (byte *s, const int bytecount, const int byteswap)
/* */
1953 {
1954 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
1955
1956 if (byteswap) {
1957 /* convert from big-endian to host byte order */
1958 for (p = end ; p != s;) {
1959 unsigned short *pp = (unsigned short *) (p -= 2);
1960 *pp = ntohs(*pp);
1961 }
1962 }
1963
1964 /* strip leading blanks */
1965 while (s != end && *s == ' ')
1966 ++s;
1967
1968 /* compress internal blanks and strip trailing blanks */
1969 while (s != end && *s) {
1970 if (*s++ != ' ' || (s != end && *s && *s != ' '))
1971 *p++ = *(s-1);
1972 }
1973
1974 /* wipe out trailing garbage */
1975 while (p != end)
1976 *p++ = '\0';
1977 }
1978
1979 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
1980 {
1981 int bswap;
1982 struct hd_driveid *id;
1983 unsigned long capacity, check;
1984
1985 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
1986 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
1987 sti();
1988
1989 /*
1990 * EATA SCSI controllers do a hardware ATA emulation: ignore them
1991 */
1992 if ((id->model[0] == 'P' && id->model[1] == 'M')
1993 || (id->model[0] == 'S' && id->model[1] == 'K')) {
1994 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
1995 drive->present = 0;
1996 return;
1997 }
1998
1999 /*
2000 * WIN_IDENTIFY returns little-endian info,
2001 * WIN_PIDENTIFY *usually* returns little-endian info.
2002 */
2003 bswap = 1;
2004 if (cmd == WIN_PIDENTIFY) {
2005 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2006 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2007 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2008 bswap = 0; /* Vertos drives may still be weird */
2009 }
2010 fixstring (id->model, sizeof(id->model), bswap);
2011 fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2012 fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2013
2014 /*
2015 * Check for an ATAPI device
2016 */
2017 if (cmd == WIN_PIDENTIFY) {
2018 #ifdef CONFIG_BLK_DEV_IDECD
2019 byte type = (id->config >> 8) & 0x0f;
2020 #endif /* CONFIG_BLK_DEV_IDECD */
2021 printk("%s: %s, ATAPI, ", drive->name, id->model);
2022 drive->media = cdrom;
2023 #ifdef CONFIG_BLK_DEV_IDECD
2024 if (type == 0 || type == 5)
2025 printk("CDROM drive\n");
2026 else
2027 printk("UNKNOWN device\n");
2028 drive->present = 1;
2029 drive->removeable = 1;
2030 #else
2031 printk("not supported by this kernel\n");
2032 #endif /* CONFIG_BLK_DEV_IDECD */
2033 return;
2034 }
2035
2036 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2037 if (id->config & (1<<7)) { /* removeable disk ? */
2038 if (id->model[0] != 'W' || id->model[1] != 'D')
2039 drive->removeable = 1;
2040 }
2041
2042 drive->media = disk;
2043 /* Extract geometry if we did not already have one for the drive */
2044 if (!drive->present) {
2045 drive->present = 1;
2046 drive->cyl = drive->bios_cyl = id->cyls;
2047 drive->head = drive->bios_head = id->heads;
2048 drive->sect = drive->bios_sect = id->sectors;
2049 }
2050 /* Handle logical geometry translation by the drive */
2051 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2052 && (id->cur_heads <= 16) && id->cur_sectors)
2053 {
2054 /*
2055 * Extract the physical drive geometry for our use.
2056 * Note that we purposely do *not* update the bios info.
2057 * This way, programs that use it (like fdisk) will
2058 * still have the same logical view as the BIOS does,
2059 * which keeps the partition table from being screwed.
2060 *
2061 * An exception to this is the cylinder count,
2062 * which we reexamine later on to correct for 1024 limitations.
2063 */
2064 drive->cyl = id->cur_cyls;
2065 drive->head = id->cur_heads;
2066 drive->sect = id->cur_sectors;
2067
2068 /* check for word-swapped "capacity" field in id information */
2069 capacity = drive->cyl * drive->head * drive->sect;
2070 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2071 if (check == capacity) { /* was it swapped? */
2072 /* yes, bring it into little-endian order: */
2073 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2074 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2075 }
2076 }
2077 /* Use physical geometry if what we have still makes no sense */
2078 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2079 drive->cyl = id->cyls;
2080 drive->head = id->heads;
2081 drive->sect = id->sectors;
2082 }
2083 /* Correct the number of cyls if the bios value is too small */
2084 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2085 if (drive->cyl > drive->bios_cyl)
2086 drive->bios_cyl = drive->cyl;
2087 }
2088
2089 (void) current_capacity (drive); /* initialize LBA selection */
2090
2091 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2092 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2093 drive->select.b.lba ? "LBA, " : "",
2094 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2095
2096 drive->mult_count = 0;
2097 if (id->max_multsect) {
2098 drive->mult_req = INITIAL_MULT_COUNT;
2099 if (drive->mult_req > id->max_multsect)
2100 drive->mult_req = id->max_multsect;
2101 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2102 drive->special.b.set_multmode = 1;
2103 }
2104 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2105 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2106 printk(", DMA");
2107 }
2108 printk("\n");
2109 }
2110
2111 /*
2112 * Delay for *at least* 10ms. As we don't know how much time is left
2113 * until the next tick occurs, we wait an extra tick to be safe.
2114 */
2115 static void delay_10ms (void)
/* */
2116 {
2117 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2118 while (timer > jiffies);
2119 }
2120
2121 /*
2122 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2123 * and waits for a response. It also monitors irqs while this is
2124 * happening, in hope of automatically determining which one is
2125 * being used by the interface.
2126 *
2127 * Returns: 0 device was identified
2128 * 1 device timed-out (no response to identify request)
2129 * 2 device aborted the command (refused to identify itself)
2130 */
2131 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2132 {
2133 int hd_status, rc;
2134 unsigned long timeout;
2135 int irqs = 0;
2136
2137 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2138 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2139 irqs = probe_irq_on(); /* start monitoring irqs */
2140 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2141 }
2142
2143 delay_10ms(); /* take a deep breath */
2144 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2145 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2146 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2147 } else
2148 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2149
2150 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2151 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2152 timeout += jiffies;
2153 do {
2154 if (jiffies > timeout) {
2155 if (!HWIF(drive)->irq)
2156 (void) probe_irq_off(irqs);
2157 return 1; /* drive timed-out */
2158 }
2159 delay_10ms(); /* give drive a breather */
2160 } while (IN_BYTE(hd_status) & BUSY_STAT);
2161
2162 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2163 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2164 cli(); /* some systems need this */
2165 do_identify(drive, cmd); /* drive returned ID */
2166 rc = 0; /* success */
2167 } else
2168 rc = 2; /* drive refused ID */
2169 if (!HWIF(drive)->irq) {
2170 irqs = probe_irq_off(irqs); /* get irq number */
2171 if (irqs > 0)
2172 HWIF(drive)->irq = irqs;
2173 else /* Mmmm.. multiple IRQs */
2174 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2175 }
2176 return rc;
2177 }
2178
2179 /*
2180 * do_probe() has the difficult job of finding a drive if it exists,
2181 * without getting hung up if it doesn't exist, without trampling on
2182 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2183 *
2184 * If a drive is "known" to exist (from CMOS or kernel parameters),
2185 * but does not respond right away, the probe will "hang in there"
2186 * for the maximum wait time (about 30 seconds), otherwise it will
2187 * exit much more quickly.
2188 *
2189 * Returns: 0 device was identified
2190 * 1 device timed-out (no response to identify request)
2191 * 2 device aborted the command (refused to identify itself)
2192 * 3 bad status from device (possible for ATAPI drives)
2193 * 4 probe was not attempted because failure was obvious
2194 */
2195 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2196 {
2197 int rc;
2198 #ifdef CONFIG_BLK_DEV_IDECD
2199 if (drive->present) { /* avoid waiting for inappropriate probes */
2200 if ((drive->media == cdrom) && (cmd == WIN_IDENTIFY))
2201 return 4;
2202 }
2203 #endif /* CONFIG_BLK_DEV_IDECD */
2204 #ifdef DEBUG
2205 printk("probing for %s: present=%d, type=%s, probetype=%s\n",
2206 drive->name, drive->present, drive->media ? "cdrom":"disk",
2207 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2208 #endif
2209 #if SUPPORT_HT6560B
2210 if (HWIF(drive)->select)
2211 ide_hwif_select (HWIF(drive));
2212 #endif
2213 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2214 delay_10ms(); /* wait for BUSY_STAT */
2215 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2216 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2217 return 3; /* no i/f present: avoid killing ethernet cards */
2218 }
2219
2220 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2221 || drive->present || cmd == WIN_PIDENTIFY)
2222 {
2223 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2224 rc = try_to_identify(drive,cmd); /* failed: try again */
2225 if (rc == 1)
2226 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2227 (void) GET_STAT(); /* ensure drive irq is clear */
2228 } else {
2229 rc = 3; /* not present or maybe ATAPI */
2230 }
2231 if (drive->select.b.unit != 0) {
2232 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2233 delay_10ms();
2234 (void) GET_STAT(); /* ensure drive irq is clear */
2235 }
2236 return rc;
2237 }
2238
2239 /*
2240 * probe_for_drive() tests for existance of a given drive using do_probe().
2241 *
2242 * Returns: 0 no device was found
2243 * 1 device was found (note: drive->present might still be 0)
2244 */
2245 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2246 {
2247 if (drive->noprobe) /* skip probing? */
2248 return drive->present;
2249 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2250 #ifdef CONFIG_BLK_DEV_IDECD
2251 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2252 #endif /* CONFIG_BLK_DEV_IDECD */
2253 }
2254 if (!drive->present)
2255 return 0; /* drive not found */
2256 if (drive->id == NULL) { /* identification failed? */
2257 if (drive->media == disk) {
2258 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2259 drive->name, drive->cyl, drive->head, drive->sect);
2260 }
2261 #ifdef CONFIG_BLK_DEV_IDECD
2262 else if (drive->media == cdrom) {
2263 printk("%s: ATAPI cdrom (?)\n", drive->name);
2264 }
2265 #endif /* CONFIG_BLK_DEV_IDECD */
2266 else {
2267 drive->present = 0; /* nuke it */
2268 return 1; /* drive was found */
2269 }
2270 }
2271 if (drive->media == disk && !drive->select.b.lba) {
2272 if (!drive->head || drive->head > 16) {
2273 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2274 drive->name, drive->head);
2275 drive->present = 0;
2276 }
2277 }
2278 return 1; /* drive was found */
2279 }
2280
2281 /*
2282 * This routine only knows how to look for drive units 0 and 1
2283 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2284 */
2285 static void probe_for_drives (ide_hwif_t *hwif)
/* */
2286 {
2287 unsigned int unit;
2288
2289 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2290 int msgout = 0;
2291 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2292 ide_drive_t *drive = &hwif->drives[unit];
2293 if (drive->present) {
2294 drive->present = 0;
2295 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2296 msgout = 1;
2297 }
2298 }
2299 if (!msgout)
2300 printk("%s: ports already in use, skipping probe\n", hwif->name);
2301 } else {
2302 unsigned long flags;
2303 save_flags(flags);
2304
2305 #if (MAX_DRIVES > 2)
2306 printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2307 #endif
2308 sti(); /* needed for jiffies and irq probing */
2309 /*
2310 * Second drive should only exist if first drive was found,
2311 * but a lot of cdrom drives seem to be configured as slave-only
2312 */
2313 for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2314 ide_drive_t *drive = &hwif->drives[unit];
2315 (void) probe_for_drive (drive);
2316 }
2317 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2318 ide_drive_t *drive = &hwif->drives[unit];
2319 if (drive->present) {
2320 hwif->present = 1;
2321 request_region(hwif->io_base, 8, hwif->name);
2322 request_region(hwif->ctl_port, 1, hwif->name);
2323 break;
2324 }
2325 }
2326 restore_flags(flags);
2327 }
2328 }
2329
2330 #if SUPPORT_DTC2278
2331 /*
2332 * From: andy@cercle.cts.com (Dyan Wile)
2333 *
2334 * Below is a patch for DTC-2278 - alike software-programmable controllers
2335 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
2336 * the primary (EIDE). You may probably have to enable the 32-bit support to
2337 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
2338 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
2339 * filesystem corrupted with -u1, but under heavy disk load only :-)
2340 *
2341 * From: mlord@bnr.ca -- this chipset is now forced to use the "serialize" feature,
2342 * which hopefully will make it more reliable to use.. maybe it has the same bugs
2343 * as the CMD640B and RZ1000 ??
2344 */
2345
2346 #if SET_DTC2278_MODE4
2347 static void sub22 (char b, char c)
/* */
2348 {
2349 int i;
2350
2351 for(i = 0; i < 3; ++i) {
2352 inb(0x3f6);
2353 outb_p(b,0xb0);
2354 inb(0x3f6);
2355 outb_p(c,0xb4);
2356 inb(0x3f6);
2357 if(inb(0xb4) == c) {
2358 outb_p(7,0xb0);
2359 inb(0x3f6);
2360 return; /* success */
2361 }
2362 }
2363 }
2364 #endif /* SET_DTC2278_MODE4 */
2365
2366 static void init_dtc2278 (void)
/* */
2367 {
2368 unsigned long flags;
2369
2370 save_flags(flags);
2371 cli();
2372 #if SET_DTC2278_MODE4
2373 /*
2374 * This enables PIO mode4 (3?) on the first interface
2375 */
2376 sub22(1,0xc3);
2377 sub22(0,0xa0);
2378 #endif /* SET_DTC2278_MODE4 */
2379 /*
2380 * This enables the second interface
2381 */
2382 outb_p(4,0xb0);
2383 inb(0x3f6);
2384 outb_p(0x20,0xb4);
2385 inb(0x3f6);
2386 restore_flags(flags);
2387 }
2388 #endif /* SUPPORT_DTC2278 */
2389
2390 #ifdef SUPPORT_QD6580
2391 /*
2392 * QDI QD6580 EIDE controller fast support by Colten Edwards.
2393 * no net access but I can be reached at pje120@cs.usask.ca
2394 *
2395 * I suppose that a IOCTL could be used for this and other
2396 * cards like it to modify the speed using hdparm. Someday..
2397 */
2398 static void init_qd6580 (void)
/* */
2399 {
2400 unsigned long flags;
2401
2402 /* looks like 0x4f is fast
2403 * 0x3f is medium
2404 * 0x2f is slower
2405 * 0x1f is slower yet
2406 * ports are 0xb0 0xb2 and 0xb3
2407 */
2408
2409 save_flags(flags);
2410 cli();
2411 outb_p(0x8d,0xb0);
2412 outb_p(0x0 ,0xb2);
2413 outb_p(0x4f,0xb3); /* select "fast" 0x4f */
2414 inb(0x3f6);
2415 restore_flags(flags);
2416 }
2417 #endif /* SUPPORT_QD6580 */
2418
2419 #if SUPPORT_CMD640
2420 /*
2421 * ??? fixme:
2422 */
2423 byte read_cmd640_vlb (byte port, byte reg)
/* */
2424 {
2425 byte val;
2426
2427 unsigned long flags;
2428 save_flags(flags);
2429 cli();
2430 outw(reg, port);
2431 val = inb(port+4);
2432 restore_flags(flags);
2433 return val;
2434 }
2435
2436 void write_cmd640_vlb (byte port, byte reg, byte val)
/* */
2437 {
2438 unsigned long flags;
2439 save_flags(flags);
2440 cli();
2441 outw(reg, port);
2442 outw(val, port+4);
2443 restore_flags(flags);
2444 }
2445
2446 void init_cmd640_vlb (void)
/* */
2447 {
2448 byte reg;
2449 unsigned short port = 0x178;
2450
2451 serialized = 1;
2452 printk("ide: buggy CMD640 interface: serialized, ");
2453 reg = read_cmd640_vlb(port, 0x50);
2454 if (reg == 0xff || (reg & 0x90) != 0x90) {
2455 #if TRY_CMD640_VLB_AT_0x78
2456 port = 0x78;
2457 reg = read_cmd640_vlb(port, 0x50);
2458 if (reg == 0xff || (reg & 0x90) != 0x90)
2459 #endif
2460 {
2461 disallow_unmask = 1;
2462 printk("(probe failed) disabled unmasking\n");
2463 return;
2464 }
2465 }
2466 write_cmd640_vlb(port, 0x51, read_cmd640_vlb(port, 0x51)|0xc8);
2467 write_cmd640_vlb(port, 0x57, read_cmd640_vlb(port, 0x57)|0x0c);
2468 printk("disabled read-ahead, enabled secondary\n");
2469
2470 }
2471 #endif /* SUPPORT_CMD640 */
2472
2473 /*
2474 * stridx() returns the offset of c within s,
2475 * or -1 if c is '\0' or not found within s.
2476 */
2477 static int stridx (const char *s, char c)
/* */
2478 {
2479 char *i = strchr(s, c);
2480 return (i && c) ? i - s : -1;
2481 }
2482
2483 /*
2484 * match_parm() does parsing for ide_setup():
2485 *
2486 * 1. the first char of s must be '='.
2487 * 2. if the remainder matches one of the supplied keywords,
2488 * the index (1 based) of the keyword is negated and returned.
2489 * 3. if the remainder is a series of no more than max_vals numbers
2490 * separated by commas, the numbers are saved in vals[] and a
2491 * count of how many were saved is returned. Base10 is assumed,
2492 * and base16 is allowed when prefixed with "0x".
2493 * 4. otherwise, zero is returned.
2494 */
2495 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2496 {
2497 static const char *decimal = "0123456789";
2498 static const char *hex = "0123456789abcdef";
2499 int i, n;
2500
2501 if (*s++ == '=') {
2502 /*
2503 * Try matching against the supplied keywords,
2504 * and return -(index+1) if we match one
2505 */
2506 for (i = 0; *keywords != NULL; ++i) {
2507 if (!strcmp(s, *keywords++))
2508 return -(i+1);
2509 }
2510 /*
2511 * Look for a series of no more than "max_vals"
2512 * numeric values separated by commas, in base10,
2513 * or base16 when prefixed with "0x".
2514 * Return a count of how many were found.
2515 */
2516 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2517 vals[n] = i;
2518 while ((i = stridx(decimal, *++s)) >= 0)
2519 vals[n] = (vals[n] * 10) + i;
2520 if (*s == 'x' && !vals[n]) {
2521 while ((i = stridx(hex, *++s)) >= 0)
2522 vals[n] = (vals[n] * 0x10) + i;
2523 }
2524 if (++n == max_vals)
2525 break;
2526 if (*s == ',')
2527 ++s;
2528 }
2529 if (!*s)
2530 return n;
2531 }
2532 return 0; /* zero = nothing matched */
2533 }
2534
2535 /*
2536 * ide_setup() gets called VERY EARLY during initialization,
2537 * to handle kernel "command line" strings beginning with "hdx="
2538 * or "ide". Here is the complete set currently supported:
2539 *
2540 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2541 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2542 *
2543 * "hdx=noprobe" : drive may be present, but do not probe for it
2544 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2545 * "hdx=cdrom" : drive is present, and is a cdrom drive
2546 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2547 *
2548 * "idex=noprobe" : do not attempt to access/use this interface
2549 * "idex=base" : probe for an interface at the addr specified,
2550 * where "base" is usually 0x1f0 or 0x170
2551 * and "ctl" is assumed to be "base"+0x206
2552 * "idex=base,ctl" : specify both base and ctl
2553 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2554 *
2555 * The following two are valid ONLY on ide0 or ide1,
2556 * and the defaults for the base,ctl ports must not be altered.
2557 *
2558 * "idex=serialize" : do not overlap operations on ide0 and ide1.
2559 * "idex=dtc2278" : enables use of DTC2278 secondary i/f
2560 * "idex=ht6560b" : enables use of HT6560B secondary i/f
2561 * "idex=cmd640_vlb" : required for VLB cards with the CMD640 chip
2562 * (not for PCI -- automatically detected)
2563 *
2564 * This option is valid ONLY on ide0, and the defaults for the base,ctl ports
2565 * must not be altered.
2566 *
2567 * "ide0=qd6580" : select "fast" interface speed on a qd6580 interface
2568 */
2569 void ide_setup (char *s)
/* */
2570 {
2571 int vals[3];
2572 ide_hwif_t *hwif;
2573 ide_drive_t *drive;
2574 unsigned int hw, unit;
2575 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2576 const char max_hwif = '0' + (MAX_HWIFS - 1);
2577
2578 printk("ide_setup: %s", s);
2579 init_ide_data ();
2580
2581 /*
2582 * Look for drive options: "hdx="
2583 */
2584 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2585 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize", NULL};
2586 unit = s[2] - 'a';
2587 hw = unit / MAX_DRIVES;
2588 unit = unit % MAX_DRIVES;
2589 hwif = &ide_hwifs[hw];
2590 drive = &hwif->drives[unit];
2591 switch (match_parm(&s[3], hd_words, vals, 3)) {
2592 case -1: /* "noprobe" */
2593 drive->noprobe = 1;
2594 goto done;
2595 case -2: /* "nowerr" */
2596 drive->bad_wstat = BAD_R_STAT;
2597 hwif->noprobe = 0;
2598 goto done;
2599 case -3: /* "cdrom" */
2600 drive->present = 1;
2601 drive->media = cdrom;
2602 hwif->noprobe = 0;
2603 goto done;
2604 case -4: /* "serialize" */
2605 printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
2606 goto do_serialize;
2607 case 3: /* cyl,head,sect */
2608 drive->media = disk;
2609 drive->cyl = drive->bios_cyl = vals[0];
2610 drive->head = drive->bios_head = vals[1];
2611 drive->sect = drive->bios_sect = vals[2];
2612 drive->present = 1;
2613 hwif->noprobe = 0;
2614 goto done;
2615 default:
2616 goto bad_option;
2617 }
2618 }
2619 /*
2620 * Look for interface options: "idex="
2621 */
2622 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2623 const char *ide_words[] = {"noprobe", "serialize", "dtc2278", "ht6560b", "cmd640_vlb", "qd6580", NULL};
2624 hw = s[3] - '0';
2625 hwif = &ide_hwifs[hw];
2626
2627 switch (match_parm(&s[4], ide_words, vals, 3)) {
2628 #if SUPPORT_QD6580
2629 case -6: /* "qd6580" */
2630 if (hw != 0) goto bad_hwif;
2631 init_qd6580();
2632 goto done;
2633 #endif /* SUPPORT_QD6580 */
2634 #if SUPPORT_CMD640
2635 case -5: /* "cmd640_vlb" */
2636 if (hw > 1) goto bad_hwif;
2637 init_cmd640_vlb();
2638 goto do_serialize; /* not necessary once we implement the above */
2639 break;
2640 #endif /* SUPPORT_CMD640 */
2641 #if SUPPORT_HT6560B
2642 case -4: /* "ht6560b" */
2643 if (hw > 1) goto bad_hwif;
2644 /*
2645 * Using 0x1c and 0x1d apparently selects a
2646 * faster interface speed than 0x3c and 0x3d.
2647 *
2648 * Need to add an ioctl to select between them.
2649 */
2650 if (check_region(0x3e6,1)) {
2651 printk(" -- HT6560 PORT 0x3e6 ALREADY IN USE");
2652 goto done;
2653 }
2654 request_region(0x3e6, 1, hwif->name);
2655 ide_hwifs[0].select = 0x3c;
2656 ide_hwifs[1].select = 0x3d;
2657 goto do_serialize;
2658 #endif /* SUPPORT_HT6560B */
2659 #if SUPPORT_DTC2278
2660 case -3: /* "dtc2278" */
2661 if (hw > 1) goto bad_hwif;
2662 init_dtc2278();
2663 goto do_serialize;
2664 #endif /* SUPPORT_DTC2278 */
2665 case -2: /* "serialize" */
2666 do_serialize:
2667 if (hw > 1) goto bad_hwif;
2668 serialized = 1;
2669 goto done;
2670 case -1: /* "noprobe" */
2671 hwif->noprobe = 1;
2672 goto done;
2673 case 1: /* base */
2674 vals[1] = vals[0] + 0x206; /* default ctl */
2675 case 2: /* base,ctl */
2676 vals[2] = 0; /* default irq = probe for it */
2677 case 3: /* base,ctl,irq */
2678 hwif->io_base = vals[0];
2679 hwif->ctl_port = vals[1];
2680 hwif->irq = vals[2];
2681 hwif->noprobe = 0;
2682 goto done;
2683 }
2684 }
2685 bad_option:
2686 printk(" -- BAD OPTION\n");
2687 return;
2688 bad_hwif:
2689 printk("-- NOT SUPPORTED ON ide%d", hw);
2690 done:
2691 printk("\n");
2692 }
2693
2694 /*
2695 * This routine is called from the partition-table code in genhd.c
2696 * to "convert" a drive to a logical geometry with fewer than 1024 cyls
2697 * It mimics the method used by Ontrack Disk Manager.
2698 */
2699 int ide_xlate_1024 (kdev_t i_rdev, int offset, const char *msg)
/* */
2700 {
2701 ide_drive_t *drive;
2702 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2703 const byte *heads = head_vals;
2704 unsigned long tracks;
2705
2706 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->id == NULL)
2707 return 0;
2708
2709 drive->cyl = drive->bios_cyl = drive->id->cyls;
2710 drive->head = drive->bios_head = drive->id->heads;
2711 drive->sect = drive->bios_sect = drive->id->sectors;
2712 drive->special.b.set_geometry = 1;
2713
2714 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2715 drive->bios_sect = 63;
2716 while (drive->bios_cyl >= 1024) {
2717 drive->bios_head = *heads;
2718 drive->bios_cyl = tracks / drive->bios_head;
2719 if (0 == *++heads)
2720 break;
2721 }
2722 if (offset) {
2723 #if FAKE_FDISK_FOR_EZDRIVE
2724 if (offset == -1)
2725 drive->ezdrive = 1;
2726 else
2727 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2728 {
2729 drive->sect0 = 63;
2730 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2731 }
2732 }
2733 drive->part[0].nr_sects = current_capacity(drive);
2734 printk("%s [%d/%d/%d]", msg, drive->bios_cyl, drive->bios_head, drive->bios_sect);
2735 return 1;
2736 }
2737
2738 /*
2739 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2740 * controller that is BIOS compatible with ST-506, and thus showing up in our
2741 * BIOS table, but not register compatible, and therefore not present in CMOS.
2742 *
2743 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2744 * drives in the system -- the ones reflected as drive 1 or 2. The first
2745 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2746 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2747 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2748 * means we have an AT controller hard disk for that drive.
2749 *
2750 * Of course, there is no guarantee that either drive is actually on the
2751 * "primary" IDE interface, but we don't bother trying to sort that out here.
2752 * If a drive is not actually on the primary interface, then these parameters
2753 * will be ignored. This results in the user having to supply the logical
2754 * drive geometry as a boot parameter for each drive not on the primary i/f.
2755 *
2756 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2757 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2758 * for us during initialization. I have the necessary docs -- any takers? -ml
2759 */
2760
2761 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2762 {
2763 #ifdef __i386__
2764 extern struct drive_info_struct drive_info;
2765 byte cmos_disks, *BIOS = (byte *) &drive_info;
2766 int unit;
2767
2768 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2769 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2770 /* Extract drive geometry from CMOS+BIOS if not already setup */
2771 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2772 ide_drive_t *drive = &hwif->drives[unit];
2773 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2774 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2775 drive->head = drive->bios_head = *(BIOS+2);
2776 drive->sect = drive->bios_sect = *(BIOS+14);
2777 drive->ctl = *(BIOS+8);
2778 drive->present = 1;
2779 }
2780 BIOS += 16;
2781 }
2782 #endif
2783 }
2784
2785 /*
2786 * This routine sets up the irq for an ide interface, and creates a new
2787 * hwgroup for the irq/hwif if none was previously assigned.
2788 *
2789 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2790 * interrupts completely disabled. This can be bad for interrupt latency,
2791 * but anything else has led to problems on some machines. We re-enable
2792 * interrupts as much as we can safely do in most places.
2793 */
2794 static int init_irq (ide_hwif_t *hwif)
/* */
2795 {
2796 unsigned long flags;
2797 int irq = hwif->irq;
2798 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
2799
2800 save_flags(flags);
2801 cli();
2802
2803 /*
2804 * Grab the irq if we don't already have it from a previous hwif
2805 */
2806 if (hwgroup == NULL) {
2807 if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2808 restore_flags(flags);
2809 printk(" -- FAILED!");
2810 return 1;
2811 }
2812 }
2813 /*
2814 * Check for serialization with ide1.
2815 * This code depends on us having already taken care of ide1.
2816 */
2817 if (serialized && hwif->name[3] == '0' && ide_hwifs[1].present)
2818 hwgroup = ide_hwifs[1].hwgroup;
2819 /*
2820 * If this is the first interface in a group,
2821 * then we need to create the hwgroup structure
2822 */
2823 if (hwgroup == NULL) {
2824 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2825 hwgroup->hwif = hwif->next = hwif;
2826 hwgroup->rq = NULL;
2827 hwgroup->handler = NULL;
2828 hwgroup->drive = NULL;
2829 hwgroup->reset_timeout = 0;
2830 #ifdef CONFIG_BLK_DEV_IDECD
2831 hwgroup->doing_atapi_reset = 0;
2832 #endif /* CONFIG_BLK_DEV_IDECD */
2833 init_timer(&hwgroup->timer);
2834 hwgroup->timer.function = &timer_expiry;
2835 hwgroup->timer.data = (unsigned long) hwgroup;
2836 } else {
2837 hwif->next = hwgroup->hwif->next;
2838 hwgroup->hwif->next = hwif;
2839 }
2840 hwif->hwgroup = hwgroup;
2841 irq_to_hwgroup[irq] = hwgroup;
2842
2843 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2844
2845 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2846 hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
2847 if (hwgroup->hwif != hwif)
2848 printk(" (serialized with %s)", hwgroup->hwif->name);
2849 printk("\n");
2850 return 0;
2851 }
2852
2853 static struct file_operations ide_fops = {
2854 NULL, /* lseek - default */
2855 block_read, /* read - general block-dev read */
2856 block_write, /* write - general block-dev write */
2857 NULL, /* readdir - bad */
2858 NULL, /* select */
2859 ide_ioctl, /* ioctl */
2860 NULL, /* mmap */
2861 ide_open, /* open */
2862 ide_release, /* release */
2863 block_fsync /* fsync */
2864 ,NULL, /* fasync */
2865 ide_check_media_change, /* check_media_change */
2866 revalidate_disk /* revalidate */
2867 };
2868
2869 #ifdef CONFIG_PCI
2870
2871 void ide_pci_access_error (int rc)
/* */
2872 {
2873 printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
2874 }
2875
2876 #if SUPPORT_RZ1000 || SUPPORT_CMD640
2877 void buggy_interface_fallback (int rc)
/* */
2878 {
2879 ide_pci_access_error (rc);
2880 serialized = 1;
2881 disallow_unmask = 1;
2882 printk("serialized, disabled unmasking\n");
2883 }
2884 #endif /* SUPPORT_RZ1000 || SUPPORT_CMD640 */
2885
2886 #if SUPPORT_RZ1000
2887 void init_rz1000 (byte bus, byte fn)
/* */
2888 {
2889 int rc;
2890 unsigned short reg;
2891
2892 printk("ide: buggy RZ1000 interface: ");
2893 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, ®))) {
2894 ide_pci_access_error (rc);
2895 } else if (!(reg & 1)) {
2896 printk("not enabled\n");
2897 } else {
2898 if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
2899 || (rc = pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
2900 buggy_interface_fallback (rc);
2901 else
2902 printk("disabled read-ahead\n");
2903 }
2904 }
2905 #endif /* SUPPORT_RZ1000 */
2906
2907 #if SUPPORT_CMD640
2908 void init_cmd640 (byte bus, byte fn)
/* */
2909 {
2910 int rc;
2911 unsigned char reg;
2912
2913 serialized = 1;
2914 printk("ide: buggy CMD640 interface: ");
2915
2916 #if 0 /* funny.. the cmd640b I tried this on claimed to not be enabled.. */
2917 unsigned short sreg;
2918 if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &sreg))) {
2919 ide_pci_access_error (rc);
2920 } else if (!(sreg & 1)) {
2921 printk("not enabled\n");
2922 } else {
2923
2924 /*
2925 * The first part is undocumented magic from the DOS driver.
2926 * According to the datasheet, there is no port 0x5b on the cmd640.
2927 */
2928 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0xbd);
2929 if (pcibios_write_config_byte(bus, fn, 0x5b, 0xbd) != 0xbd)
2930 printk("init_cmd640: huh? 0x5b read back wrong\n");
2931 (void) pcibios_write_config_byte(bus, fn, 0x5b, 0);
2932 #endif /* 0 */
2933 /*
2934 * The rest is from the cmd640b datasheet.
2935 */
2936 if ((rc = pcibios_read_config_byte(bus, fn, 0x51, ®))
2937 || (rc = pcibios_write_config_byte(bus, fn, 0x51, reg | 0xc0)) /* 0xc8 to enable 2nd i/f */
2938 || (rc = pcibios_read_config_byte(bus, fn, 0x57, ®))
2939 || (rc = pcibios_write_config_byte(bus, fn, 0x57, reg | 0x0c)))
2940 buggy_interface_fallback (rc);
2941 else
2942 printk("serialized, disabled read-ahead\n");
2943 }
2944 #endif /* SUPPORT_CMD640 */
2945
2946 typedef void (ide_pci_init_proc_t)(byte, byte);
2947
2948 /*
2949 * ide_probe_pci() scans PCI for a specific vendor/device function,
2950 * and invokes the supplied init routine for each instance detected.
2951 */
2952 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init)
/* */
2953 {
2954 unsigned long flags;
2955 unsigned index;
2956 byte fn, bus;
2957
2958 save_flags(flags);
2959 cli();
2960 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2961 init (bus, fn);
2962 }
2963 restore_flags(flags);
2964 }
2965
2966 /*
2967 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2968 *
2969 * This routine should ideally be using pcibios_find_class() to find
2970 * all IDE interfaces, but that function causes some systems to "go weird".
2971 */
2972 static void ide_init_pci (void)
/* */
2973 {
2974 #if SUPPORT_RZ1000
2975 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000);
2976 #endif
2977 #if SUPPORT_CMD640
2978 ide_probe_pci (PCI_VENDOR_ID_CMD, PCI_DEVICE_ID_CMD_640, &init_cmd640);
2979 #endif
2980 #ifdef CONFIG_BLK_DEV_TRITON
2981 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_1, &ide_init_triton);
2982 #endif
2983 }
2984 #endif /* CONFIG_PCI */
2985
2986 /*
2987 * This is gets invoked once during initialization, to set *everything* up
2988 */
2989 int ide_init (void)
/* ![[last]](../icons/n_last.png)
*/
2990 {
2991 int h;
2992
2993 init_ide_data ();
2994 /*
2995 * First, we determine what hardware is present
2996 */
2997
2998 #ifdef CONFIG_PCI
2999 /*
3000 * Find/initialize PCI IDE interfaces
3001 */
3002 if (pcibios_present())
3003 ide_init_pci ();
3004 #endif /* CONFIG_PCI */
3005
3006 /*
3007 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3008 */
3009 for (h = 0; h < MAX_HWIFS; ++h) {
3010 ide_hwif_t *hwif = &ide_hwifs[h];
3011 if (!hwif->noprobe) {
3012 if (hwif->io_base == HD_DATA)
3013 probe_cmos_for_drives (hwif);
3014 probe_for_drives (hwif);
3015 }
3016 if (hwif->present) {
3017 if (!hwif->irq) {
3018 if (!(hwif->irq = default_irqs[h])) {
3019 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3020 hwif->present = 0;
3021 continue;
3022 }
3023 }
3024 #ifdef CONFIG_BLK_DEV_HD
3025 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3026 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3027 hwif->present = 0;
3028 }
3029 #endif /* CONFIG_BLK_DEV_HD */
3030 }
3031 }
3032
3033 /*
3034 * Now we try to set up irqs and major devices for what was found
3035 */
3036 for (h = MAX_HWIFS-1; h >= 0; --h) {
3037 void (*rfn)(void);
3038 ide_hwif_t *hwif = &ide_hwifs[h];
3039 if (!hwif->present)
3040 continue;
3041 hwif->present = 0; /* we set it back to 1 if all is ok below */
3042 switch (hwif->major) {
3043 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3044 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3045 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3046 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3047 default:
3048 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3049 continue;
3050 }
3051 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3052 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3053 } else if (init_irq (hwif)) {
3054 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3055 (void) unregister_blkdev (hwif->major, hwif->name);
3056 } else {
3057 init_gendisk(hwif);
3058 blk_dev[hwif->major].request_fn = rfn;
3059 read_ahead[hwif->major] = 8; /* (4kB) */
3060 hwif->present = 1; /* success */
3061 }
3062 }
3063 return 0;
3064 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/