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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.30 Feb 27, 1996
3 *
4 * Copyright (C) 1994-1996 Linus Torvalds & authors (see below)
5 */
6 #define _IDE_C /* needed by <linux/blk.h> */
7
8 /*
9 * This is the multiple IDE interface driver, as evolved from hd.c.
10 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
11 * There can be up to two drives per interface, as per the ATA-2 spec.
12 *
13 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
14 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
15 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
16 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
17 *
18 * It is easy to extend ide.c to handle more than four interfaces:
19 *
20 * Change the MAX_HWIFS constant in ide.h.
21 *
22 * Define some new major numbers (in major.h), and insert them into
23 * the ide_hwif_to_major table in ide.c.
24 *
25 * Fill in the extra values for the new interfaces into the two tables
26 * inside ide.c: default_io_base[] and default_irqs[].
27 *
28 * Create the new request handlers by cloning "do_ide3_request()"
29 * for each new interface, and add them to the switch statement
30 * in the ide_init() function in ide.c.
31 *
32 * Recompile, create the new /dev/ entries, and it will probably work.
33 *
34 * From hd.c:
35 * |
36 * | It traverses the request-list, using interrupts to jump between functions.
37 * | As nearly all functions can be called within interrupts, we may not sleep.
38 * | Special care is recommended. Have Fun!
39 * |
40 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
41 * |
42 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
43 * | in the early extended-partition checks and added DM partitions.
44 * |
45 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
46 * |
47 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
48 * | and general streamlining by Mark Lord (mlord@pobox.com).
49 *
50 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
51 *
52 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
53 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
54 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
55 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
56 *
57 * Maintained by Mark Lord (mlord@pobox.com): ide.c, ide.h, triton.c, hd.c, ..
58 *
59 * This was a rewrite of just about everything from hd.c, though some original
60 * code is still sprinkled about. Think of it as a major evolution, with
61 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
62 *
63 * Version 1.0 ALPHA initial code, primary i/f working okay
64 * Version 1.3 BETA dual i/f on shared irq tested & working!
65 * Version 1.4 BETA added auto probing for irq(s)
66 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
67 * ...
68 * Version 3.5 correct the bios_cyl field if it's too small
69 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
70 * Version 3.6 cosmetic corrections to comments and stuff
71 * (linux 1.1.77) reorganise probing code to make it understandable
72 * added halfway retry to probing for drive identification
73 * added "hdx=noprobe" command line option
74 * allow setting multmode even when identification fails
75 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
76 * increase DRQ_WAIT to eliminate nuisance messages
77 * wait for DRQ_STAT instead of DATA_READY during probing
78 * (courtesy of Gary Thomas gary@efland.UU.NET)
79 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
80 * update of ide-cd.c from Scott, allows blocksize=1024
81 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
82 * Version 3.9 don't use LBA if lba_capacity looks funny
83 * correct the drive capacity calculations
84 * fix probing for old Seagates without IDE_ALTSTATUS_REG
85 * fix byte-ordering for some NEC cdrom drives
86 * Version 3.10 disable multiple mode by default; was causing trouble
87 * Version 3.11 fix mis-identification of old WD disks as cdroms
88 * Version 3,12 simplify logic for selecting initial mult_count
89 * (fixes problems with buggy WD drives)
90 * Version 3.13 remove excess "multiple mode disabled" messages
91 * Version 3.14 fix ide_error() handling of BUSY_STAT
92 * fix byte-swapped cdrom strings (again.. arghh!)
93 * ignore INDEX bit when checking the ALTSTATUS reg
94 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
95 * ignore WRERR_STAT for non-write operations
96 * added vlb_sync support for DC-2000A & others,
97 * (incl. some Promise chips), courtesy of Frank Gockel
98 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
99 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
100 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
101 * add boot flag to "serialize" operation for CMD i/f
102 * add optional support for DTC2278 interfaces,
103 * courtesy of andy@cercle.cts.com (Dyan Wile).
104 * add boot flag to enable "dtc2278" probe
105 * add probe to avoid EATA (SCSI) interfaces,
106 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
107 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
108 * add flag to ignore WRERR_STAT for some drives
109 * courtesy of David.H.West@um.cc.umich.edu
110 * assembly syntax tweak to vlb_sync
111 * removeable drive support from scuba@cs.tu-berlin.de
112 * add transparent support for DiskManager-6.0x "Dynamic
113 * Disk Overlay" (DDO), most of this is in genhd.c
114 * eliminate "multiple mode turned off" message at boot
115 * Version 4.10 fix bug in ioctl for "hdparm -c3"
116 * fix DM6:DDO support -- now works with LILO, fdisk, ...
117 * don't treat some naughty WD drives as removeable
118 * Version 4.11 updated DM6 support using info provided by OnTrack
119 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
120 * added support for 3rd/4th/alternative IDE ports
121 * created ide.h; ide-cd.c now compiles separate from ide.c
122 * hopefully fixed infinite "unexpected_intr" from cdroms
123 * zillions of other changes and restructuring
124 * somehow reduced overall memory usage by several kB
125 * probably slowed things down slightly, but worth it
126 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
127 * was happening at various times/places: whenever the
128 * ide-interface's ctl_port was used to "mask" the irq,
129 * it also would trigger an edge in the process of masking
130 * which would result in a self-inflicted interrupt!!
131 * (such a stupid way to build a hardware interrupt mask).
132 * This is now fixed (after a year of head-scratching).
133 * Version 5.02 got rid of need for {enable,disable}_irq_list()
134 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
135 * removed PROBE_FOR_IRQS option -- no longer needed
136 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
137 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
138 * added more comments, cleaned up unexpected_intr()
139 * OOOPS! fixed null pointer problem in ide reset code
140 * added autodetect for Triton chipset -- no effect yet
141 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
142 * OOOPS! fixed bug in ide_do_request()
143 * added ATAPI reset sequence for cdroms
144 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
145 * some (mostly) cosmetic changes
146 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
147 * reworked PCI scanning code
148 * added automatic RZ1000 detection/support
149 * added automatic PCI CMD640 detection/support
150 * added option for VLB CMD640 support
151 * tweaked probe to find cdrom on hdb with disks on hda,hdc
152 * Version 5.12 some performance tuning
153 * added message to alert user to bad /dev/hd[cd] entries
154 * OOOPS! fixed bug in atapi reset
155 * driver now forces "serialize" again for all cmd640 chips
156 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
157 * made do_drive_cmd() into public ide_do_drive_cmd()
158 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
159 * fixed ht6560b support
160 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
161 * don't bother invalidating nonexistent partitions
162 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
163 * added & tested full EZ-DRIVE support -- don't use LILO!
164 * don't enable 2nd CMD640 PCI port during init - conflict
165 * Version 5.15 bug fix in init_cmd640_vlb()
166 * bug fix in interrupt sharing code
167 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
168 * remove "Huh?" from cmd640 code
169 * added qd6580 interface speed select from Colten Edwards
170 * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
171 * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
172 * new UMC8672 code, moved to umc8672.c, #include'd for now
173 * disallow turning on DMA when h/w not capable of DMA
174 * Version 5.19 fix potential infinite timeout on resets
175 * extend reset poll into a general purpose polling scheme
176 * add atapi tape drive support from Gadi Oxman
177 * simplify exit from _intr routines -- no IDE_DO_REQUEST
178 * Version 5.20 leave current rq on blkdev request list during I/O
179 * generalized ide_do_drive_cmd() for tape/cdrom driver use
180 * Version 5.21 fix nasty cdrom/tape bug (ide_preempt was messed up)
181 * Version 5.22 fix ide_xlate_1024() to work with/without drive->id
182 * Version 5.23 miscellaneous touch-ups
183 * Version 5.24 fix #if's for SUPPORT_CMD640
184 * Version 5.25 more touch-ups, fix cdrom resets, ...
185 * cmd640.c now configs/compiles separate from ide.c
186 * Version 5.26 keep_settings now maintains the using_dma flag
187 * fix [EZD] remap message to only output at boot time
188 * fix "bad /dev/ entry" message to say hdc, not hdc0
189 * fix ide_xlate_1024() to respect user specified CHS
190 * use CHS from partn table if it looks translated
191 * re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
192 * keep track of interface chipset type, when known
193 * add generic PIO mode "tuneproc" mechanism
194 * fix cmd640_vlb option
195 * fix ht6560b support (was completely broken)
196 * umc8672.c now configures/compiles separate from ide.c
197 * move dtc2278 support to dtc2278.c
198 * move ht6560b support to ht6560b.c
199 * move qd6580 support to qd6580.c
200 * add ali14xx support in ali14xx.c
201 * Version 5.27 add [no]autotune parameters to help cmd640
202 * move rz1000 support to rz1000.c
203 * Version 5.28 #include "ide_modes.h"
204 * fix disallow_unmask: now per-interface "no_unmask" bit
205 * force io_32bit to be the same on drive pairs of dtc2278
206 * improved IDE tape error handling, and tape DMA support
207 * bugfix in ide_do_drive_cmd() for cdroms + serialize
208 * Version 5.29 fixed non-IDE check for too many physical heads
209 * don't use LBA if capacity is smaller than CHS
210 * Version 5.30 remove real_devices kludge, formerly used by genhd.c
211 *
212 * Some additional driver compile-time options are in ide.h
213 *
214 * To do, in likely order of completion:
215 * - add Promise DC4030VL support from peterd@pnd-pc.demon.co.uk
216 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
217 */
218
219 #undef REALLY_SLOW_IO /* most systems can safely undef this */
220
221 #include <linux/config.h>
222 #include <linux/types.h>
223 #include <linux/string.h>
224 #include <linux/kernel.h>
225 #include <linux/delay.h>
226 #include <linux/timer.h>
227 #include <linux/mm.h>
228 #include <linux/ioport.h>
229 #include <linux/interrupt.h>
230 #include <linux/major.h>
231 #include <linux/blkdev.h>
232 #include <linux/errno.h>
233 #include <linux/hdreg.h>
234 #include <linux/genhd.h>
235 #include <linux/malloc.h>
236
237 #include <asm/byteorder.h>
238 #include <asm/irq.h>
239 #include <asm/segment.h>
240 #include <asm/io.h>
241
242 #ifdef CONFIG_PCI
243 #include <linux/bios32.h>
244 #include <linux/pci.h>
245 #endif /* CONFIG_PCI */
246
247 #include "ide.h"
248 #include "ide_modes.h"
249
250 static ide_hwgroup_t *irq_to_hwgroup [NR_IRQS];
251 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
252
253 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
254 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
255
256 #if (DISK_RECOVERY_TIME > 0)
257 /*
258 * For really screwy hardware (hey, at least it *can* be used with Linux)
259 * we can enforce a minimum delay time between successive operations.
260 */
261 static unsigned long read_timer(void)
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262 {
263 unsigned long t, flags;
264 int i;
265
266 save_flags(flags);
267 cli();
268 t = jiffies * 11932;
269 outb_p(0, 0x43);
270 i = inb_p(0x40);
271 i |= inb(0x40) << 8;
272 restore_flags(flags);
273 return (t - i);
274 }
275
276 static void set_recovery_timer (ide_hwif_t *hwif)
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*/
277 {
278 hwif->last_time = read_timer();
279 }
280 #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
281
282 #else
283
284 #define SET_RECOVERY_TIMER(drive)
285
286 #endif /* DISK_RECOVERY_TIME */
287
288 /*
289 * init_ide_data() sets reasonable default values into all fields
290 * of all instances of the hwifs and drives, but only on the first call.
291 * Subsequent calls have no effect (they don't wipe out anything).
292 *
293 * This routine is normally called at driver initialization time,
294 * but may also be called MUCH earlier during kernel "command-line"
295 * parameter processing. As such, we cannot depend on any other parts
296 * of the kernel (such as memory allocation) to be functioning yet.
297 *
298 * This is too bad, as otherwise we could dynamically allocate the
299 * ide_drive_t structs as needed, rather than always consuming memory
300 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
301 */
302 #define MAGIC_COOKIE 0x12345678
303 static void init_ide_data (void)
/* */
304 {
305 byte *p;
306 unsigned int h, unit;
307 static unsigned long magic_cookie = MAGIC_COOKIE;
308
309 if (magic_cookie != MAGIC_COOKIE)
310 return; /* already initialized */
311 magic_cookie = 0;
312
313 for (h = 0; h < NR_IRQS; ++h)
314 irq_to_hwgroup[h] = NULL;
315
316 /* bulk initialize hwif & drive info with zeros */
317 p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
318 do {
319 *--p = 0;
320 } while (p > (byte *) ide_hwifs);
321
322 /* fill in any non-zero initial values */
323 for (h = 0; h < MAX_HWIFS; ++h) {
324 ide_hwif_t *hwif = &ide_hwifs[h];
325
326 hwif->index = h;
327 hwif->noprobe = (h > 1);
328 hwif->io_base = default_io_base[h];
329 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
330 #ifdef CONFIG_BLK_DEV_HD
331 if (hwif->io_base == HD_DATA)
332 hwif->noprobe = 1; /* may be overriden by ide_setup() */
333 #endif /* CONFIG_BLK_DEV_HD */
334 hwif->major = ide_hwif_to_major[h];
335 hwif->name[0] = 'i';
336 hwif->name[1] = 'd';
337 hwif->name[2] = 'e';
338 hwif->name[3] = '0' + h;
339 #ifdef CONFIG_BLK_DEV_IDETAPE
340 hwif->tape_drive = NULL;
341 #endif /* CONFIG_BLK_DEV_IDETAPE */
342 for (unit = 0; unit < MAX_DRIVES; ++unit) {
343 ide_drive_t *drive = &hwif->drives[unit];
344
345 drive->select.all = (unit<<4)|0xa0;
346 drive->hwif = hwif;
347 drive->ctl = 0x08;
348 drive->ready_stat = READY_STAT;
349 drive->bad_wstat = BAD_W_STAT;
350 drive->special.b.recalibrate = 1;
351 drive->special.b.set_geometry = 1;
352 drive->name[0] = 'h';
353 drive->name[1] = 'd';
354 drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
355 }
356 }
357 }
358
359 #if SUPPORT_VLB_SYNC
360 /*
361 * Some localbus EIDE interfaces require a special access sequence
362 * when using 32-bit I/O instructions to transfer data. We call this
363 * the "vlb_sync" sequence, which consists of three successive reads
364 * of the sector count register location, with interrupts disabled
365 * to ensure that the reads all happen together.
366 */
367 static inline void do_vlb_sync (unsigned short port) {
/* */
368 (void) inb (port);
369 (void) inb (port);
370 (void) inb (port);
371 }
372 #endif /* SUPPORT_VLB_SYNC */
373
374 /*
375 * This is used for most PIO data transfers *from* the IDE interface
376 */
377 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
378 {
379 unsigned short io_base = HWIF(drive)->io_base;
380 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
381 byte io_32bit = drive->io_32bit;
382
383 if (io_32bit) {
384 #if SUPPORT_VLB_SYNC
385 if (io_32bit & 2) {
386 cli();
387 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
388 insl(data_reg, buffer, wcount);
389 if (drive->unmask)
390 sti();
391 } else
392 #endif /* SUPPORT_VLB_SYNC */
393 insl(data_reg, buffer, wcount);
394 } else
395 insw(data_reg, buffer, wcount<<1);
396 }
397
398 /*
399 * This is used for most PIO data transfers *to* the IDE interface
400 */
401 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
402 {
403 unsigned short io_base = HWIF(drive)->io_base;
404 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
405 byte io_32bit = drive->io_32bit;
406
407 if (io_32bit) {
408 #if SUPPORT_VLB_SYNC
409 if (io_32bit & 2) {
410 cli();
411 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
412 outsl(data_reg, buffer, wcount);
413 if (drive->unmask)
414 sti();
415 } else
416 #endif /* SUPPORT_VLB_SYNC */
417 outsl(data_reg, buffer, wcount);
418 } else
419 outsw(data_reg, buffer, wcount<<1);
420 }
421
422 /*
423 * This should get invoked any time we exit the driver to
424 * wait for an interrupt response from a drive. handler() points
425 * at the appropriate code to handle the next interrupt, and a
426 * timer is started to prevent us from waiting forever in case
427 * something goes wrong (see the timer_expiry() handler later on).
428 */
429 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
/* */
430 {
431 ide_hwgroup_t *hwgroup = HWGROUP(drive);
432 #ifdef DEBUG
433 if (hwgroup->handler != NULL) {
434 printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
435 drive->name, hwgroup->handler, handler);
436 }
437 #endif
438 hwgroup->handler = handler;
439 hwgroup->timer.expires = jiffies + timeout;
440 add_timer(&(hwgroup->timer));
441 }
442
443 /*
444 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
445 * value for this drive (from its reported identification information).
446 *
447 * Returns: 1 if lba_capacity looks sensible
448 * 0 otherwise
449 */
450 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
451 {
452 unsigned long lba_sects = id->lba_capacity;
453 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
454 unsigned long _10_percent = chs_sects / 10;
455
456 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
457 if ((lba_sects - chs_sects) < _10_percent)
458 return 1; /* lba_capacity is good */
459
460 /* some drives have the word order reversed */
461 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
462 if ((lba_sects - chs_sects) < _10_percent) {
463 id->lba_capacity = lba_sects; /* fix it */
464 return 1; /* lba_capacity is (now) good */
465 }
466 return 0; /* lba_capacity value is bad */
467 }
468
469 /*
470 * current_capacity() returns the capacity (in sectors) of a drive
471 * according to its current geometry/LBA settings.
472 */
473 static unsigned long current_capacity (ide_drive_t *drive)
/* */
474 {
475 struct hd_driveid *id = drive->id;
476 unsigned long capacity = drive->cyl * drive->head * drive->sect;
477
478 if (!drive->present)
479 return 0;
480 if (drive->media != ide_disk)
481 return 0x7fffffff; /* cdrom or tape */
482 drive->select.b.lba = 0;
483 /* Determine capacity, and use LBA if the drive properly supports it */
484 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
485 if (id->lba_capacity >= capacity) {
486 capacity = id->lba_capacity;
487 drive->select.b.lba = 1;
488 }
489 }
490 return (capacity - drive->sect0);
491 }
492
493 /*
494 * ide_geninit() is called exactly *once* for each major, from genhd.c,
495 * at the beginning of the initial partition check for the drives.
496 */
497 static void ide_geninit (struct gendisk *gd)
/* */
498 {
499 unsigned int unit;
500 ide_hwif_t *hwif = gd->real_devices;
501
502 for (unit = 0; unit < gd->nr_real; ++unit) {
503 ide_drive_t *drive = &hwif->drives[unit];
504 #ifdef CONFIG_BLK_DEV_IDECD
505 if (drive->present && drive->media == ide_cdrom)
506 ide_cdrom_setup(drive);
507 #endif /* CONFIG_BLK_DEV_IDECD */
508 #ifdef CONFIG_BLK_DEV_IDETAPE
509 if (drive->present && drive->media == ide_tape)
510 idetape_setup(drive);
511 #endif /* CONFIG_BLK_DEV_IDETAPE */
512 drive->part[0].nr_sects = current_capacity(drive);
513 if (!drive->present || drive->media != ide_disk) {
514 drive->part[0].start_sect = -1; /* skip partition check */
515 }
516 }
517 }
518
519 /*
520 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
521 * after probing for drives, to allocate partition tables and other data
522 * structures needed for the routines in genhd.c. ide_geninit() gets called
523 * somewhat later, during the partition check.
524 */
525 static void init_gendisk (ide_hwif_t *hwif)
/* */
526 {
527 struct gendisk *gd, **gdp;
528 unsigned int unit, units, minors;
529 int *bs;
530
531 /* figure out maximum drive number on the interface */
532 for (units = MAX_DRIVES; units > 0; --units) {
533 if (hwif->drives[units-1].present)
534 break;
535 }
536 minors = units * (1<<PARTN_BITS);
537 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
538 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
539 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
540 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
541
542 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
543 blksize_size[hwif->major] = bs;
544 for (unit = 0; unit < minors; ++unit)
545 *bs++ = BLOCK_SIZE;
546
547 for (unit = 0; unit < units; ++unit)
548 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
549
550 gd->major = hwif->major; /* our major device number */
551 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
552 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
553 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
554 gd->max_nr = units; /* max num real drives */
555 gd->nr_real = units; /* current num real drives */
556 gd->init = ide_geninit; /* initialization function */
557 gd->real_devices= hwif; /* ptr to internal data */
558
559 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
560 gd->next = NULL; /* link to tail of list */
561 hwif->gd = *gdp = gd;
562 }
563
564 static void do_reset1 (ide_drive_t *, int); /* needed below */
565
566 #ifdef CONFIG_BLK_DEV_IDEATAPI
567 /*
568 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
569 * during an atapi drive reset operation. If the drive has not yet responded,
570 * and we have not yet hit our maximum waiting time, then the timer is restarted
571 * for another 50ms.
572 */
573 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
574 {
575 ide_hwgroup_t *hwgroup = HWGROUP(drive);
576 byte stat;
577
578 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
579 udelay (10);
580
581 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
582 printk("%s: ATAPI reset complete\n", drive->name);
583 } else {
584 if (jiffies < hwgroup->poll_timeout) {
585 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
586 return; /* continue polling */
587 }
588 hwgroup->poll_timeout = 0; /* end of polling */
589 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
590 do_reset1 (drive, 1); /* do it the old fashioned way */
591 }
592 hwgroup->poll_timeout = 0; /* done polling */
593 }
594 #endif /* CONFIG_BLK_DEV_IDEATAPI */
595
596 /*
597 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
598 * during an ide reset operation. If the drives have not yet responded,
599 * and we have not yet hit our maximum waiting time, then the timer is restarted
600 * for another 50ms.
601 */
602 static void reset_pollfunc (ide_drive_t *drive)
/* */
603 {
604 ide_hwgroup_t *hwgroup = HWGROUP(drive);
605 ide_hwif_t *hwif = HWIF(drive);
606 byte tmp;
607
608 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
609 if (jiffies < hwgroup->poll_timeout) {
610 ide_set_handler (drive, &reset_pollfunc, HZ/20);
611 return; /* continue polling */
612 }
613 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
614 } else {
615 printk("%s: reset: ", hwif->name);
616 if ((tmp = GET_ERR()) == 1)
617 printk("success\n");
618 else {
619 #if FANCY_STATUS_DUMPS
620 printk("master: ");
621 switch (tmp & 0x7f) {
622 case 1: printk("passed");
623 break;
624 case 2: printk("formatter device error");
625 break;
626 case 3: printk("sector buffer error");
627 break;
628 case 4: printk("ECC circuitry error");
629 break;
630 case 5: printk("controlling MPU error");
631 break;
632 default:printk("error (0x%02x?)", tmp);
633 }
634 if (tmp & 0x80)
635 printk("; slave: failed");
636 printk("\n");
637 #else
638 printk("failed\n");
639 #endif /* FANCY_STATUS_DUMPS */
640 }
641 }
642 hwgroup->poll_timeout = 0; /* done polling */
643 }
644
645 /*
646 * do_reset1() attempts to recover a confused drive by resetting it.
647 * Unfortunately, resetting a disk drive actually resets all devices on
648 * the same interface, so it can really be thought of as resetting the
649 * interface rather than resetting the drive.
650 *
651 * ATAPI devices have their own reset mechanism which allows them to be
652 * individually reset without clobbering other devices on the same interface.
653 *
654 * Unfortunately, the IDE interface does not generate an interrupt to let
655 * us know when the reset operation has finished, so we must poll for this.
656 * Equally poor, though, is the fact that this may a very long time to complete,
657 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
658 * we set a timer to poll at 50ms intervals.
659 */
660 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
661 {
662 unsigned int unit;
663 unsigned long flags;
664 ide_hwif_t *hwif = HWIF(drive);
665 ide_hwgroup_t *hwgroup = HWGROUP(drive);
666
667 save_flags(flags);
668 cli(); /* Why ? */
669
670 #ifdef CONFIG_BLK_DEV_IDEATAPI
671 /* For an ATAPI device, first try an ATAPI SRST. */
672 if (drive->media != ide_disk) {
673 if (!do_not_try_atapi) {
674 if (!drive->keep_settings)
675 drive->unmask = 0;
676 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
677 udelay (20);
678 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
679 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
680 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
681 restore_flags (flags);
682 return;
683 }
684 }
685 #endif /* CONFIG_BLK_DEV_IDEATAPI */
686
687 /*
688 * First, reset any device state data we were maintaining
689 * for any of the drives on this interface.
690 */
691 for (unit = 0; unit < MAX_DRIVES; ++unit) {
692 ide_drive_t *rdrive = &hwif->drives[unit];
693 rdrive->special.all = 0;
694 rdrive->special.b.set_geometry = 1;
695 rdrive->special.b.recalibrate = 1;
696 if (OK_TO_RESET_CONTROLLER)
697 rdrive->mult_count = 0;
698 if (!rdrive->keep_settings) {
699 rdrive->using_dma = 0;
700 rdrive->mult_req = 0;
701 rdrive->unmask = 0;
702 }
703 if (rdrive->mult_req != rdrive->mult_count)
704 rdrive->special.b.set_multmode = 1;
705 }
706
707 #if OK_TO_RESET_CONTROLLER
708 /*
709 * Note that we also set nIEN while resetting the device,
710 * to mask unwanted interrupts from the interface during the reset.
711 * However, due to the design of PC hardware, this will cause an
712 * immediate interrupt due to the edge transition it produces.
713 * This single interrupt gives us a "fast poll" for drives that
714 * recover from reset very quickly, saving us the first 50ms wait time.
715 */
716 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
717 udelay(5); /* more than enough time */
718 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
719 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
720 ide_set_handler (drive, &reset_pollfunc, HZ/20);
721 #endif /* OK_TO_RESET_CONTROLLER */
722
723 restore_flags (flags);
724 }
725
726 /*
727 * ide_do_reset() is the entry point to the drive/interface reset code.
728 */
729 void ide_do_reset (ide_drive_t *drive)
/* */
730 {
731 do_reset1 (drive, 0);
732 #ifdef CONFIG_BLK_DEV_IDETAPE
733 if (drive->media == ide_tape)
734 drive->tape.reset_issued=1;
735 #endif /* CONFIG_BLK_DEV_IDETAPE */
736 }
737
738 /*
739 * Clean up after success/failure of an explicit drive cmd
740 */
741 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
742 {
743 unsigned long flags;
744 struct request *rq = HWGROUP(drive)->rq;
745
746 if (rq->cmd == IDE_DRIVE_CMD) {
747 byte *args = (byte *) rq->buffer;
748 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
749 if (args) {
750 args[0] = stat;
751 args[1] = err;
752 args[2] = IN_BYTE(IDE_NSECTOR_REG);
753 }
754 }
755 save_flags(flags);
756 cli();
757 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
758 HWGROUP(drive)->rq = NULL;
759 rq->rq_status = RQ_INACTIVE;
760 if (rq->sem != NULL)
761 up(rq->sem);
762 restore_flags(flags);
763 }
764
765 /*
766 * Error reporting, in human readable form (luxurious, but a memory hog).
767 */
768 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
769 {
770 unsigned long flags;
771 byte err = 0;
772
773 save_flags (flags);
774 sti();
775 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
776 #if FANCY_STATUS_DUMPS
777 if (drive->media == ide_disk) {
778 printk(" { ");
779 if (stat & BUSY_STAT)
780 printk("Busy ");
781 else {
782 if (stat & READY_STAT) printk("DriveReady ");
783 if (stat & WRERR_STAT) printk("DeviceFault ");
784 if (stat & SEEK_STAT) printk("SeekComplete ");
785 if (stat & DRQ_STAT) printk("DataRequest ");
786 if (stat & ECC_STAT) printk("CorrectedError ");
787 if (stat & INDEX_STAT) printk("Index ");
788 if (stat & ERR_STAT) printk("Error ");
789 }
790 printk("}");
791 }
792 #endif /* FANCY_STATUS_DUMPS */
793 printk("\n");
794 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
795 err = GET_ERR();
796 printk("%s: %s: error=0x%02x", drive->name, msg, err);
797 #if FANCY_STATUS_DUMPS
798 if (drive->media == ide_disk) {
799 printk(" { ");
800 if (err & BBD_ERR) printk("BadSector ");
801 if (err & ECC_ERR) printk("UncorrectableError ");
802 if (err & ID_ERR) printk("SectorIdNotFound ");
803 if (err & ABRT_ERR) printk("DriveStatusError ");
804 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
805 if (err & MARK_ERR) printk("AddrMarkNotFound ");
806 printk("}");
807 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
808 byte cur = IN_BYTE(IDE_SELECT_REG);
809 if (cur & 0x40) { /* using LBA? */
810 printk(", LBAsect=%ld", (unsigned long)
811 ((cur&0xf)<<24)
812 |(IN_BYTE(IDE_HCYL_REG)<<16)
813 |(IN_BYTE(IDE_LCYL_REG)<<8)
814 | IN_BYTE(IDE_SECTOR_REG));
815 } else {
816 printk(", CHS=%d/%d/%d",
817 (IN_BYTE(IDE_HCYL_REG)<<8) +
818 IN_BYTE(IDE_LCYL_REG),
819 cur & 0xf,
820 IN_BYTE(IDE_SECTOR_REG));
821 }
822 if (HWGROUP(drive)->rq)
823 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
824 }
825 }
826 #endif /* FANCY_STATUS_DUMPS */
827 printk("\n");
828 }
829 restore_flags (flags);
830 return err;
831 }
832
833 /*
834 * try_to_flush_leftover_data() is invoked in response to a drive
835 * unexpectedly having its DRQ_STAT bit set. As an alternative to
836 * resetting the drive, this routine tries to clear the condition
837 * by read a sector's worth of data from the drive. Of course,
838 * this may not help if the drive is *waiting* for data from *us*.
839 */
840 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
841 {
842 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
843
844 while (i > 0) {
845 unsigned long buffer[16];
846 unsigned int wcount = (i > 16) ? 16 : i;
847 i -= wcount;
848 ide_input_data (drive, buffer, wcount);
849 }
850 }
851
852 /*
853 * ide_error() takes action based on the error returned by the controller.
854 */
855 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
856 {
857 struct request *rq;
858 byte err;
859
860 err = ide_dump_status(drive, msg, stat);
861 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
862 return;
863 /* retry only "normal" I/O: */
864 if (rq->cmd == IDE_DRIVE_CMD || (rq->cmd != READ && rq->cmd != WRITE && drive->media == ide_disk))
865 {
866 rq->errors = 1;
867 ide_end_drive_cmd(drive, stat, err);
868 return;
869 }
870 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
871 rq->errors |= ERROR_RESET;
872 } else {
873 if (drive->media == ide_disk && (stat & ERR_STAT)) {
874 /* err has different meaning on cdrom and tape */
875 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
876 rq->errors = ERROR_MAX;
877 else if (err & TRK0_ERR) /* help it find track zero */
878 rq->errors |= ERROR_RECAL;
879 }
880 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
881 try_to_flush_leftover_data(drive);
882 }
883 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
884 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
885
886 if (rq->errors >= ERROR_MAX) {
887 #ifdef CONFIG_BLK_DEV_IDETAPE
888 if (drive->media == ide_tape) {
889 rq->errors = 0;
890 idetape_end_request(0, HWGROUP(drive));
891 }
892 else
893 #endif /* CONFIG_BLK_DEV_IDETAPE */
894 ide_end_request(0, HWGROUP(drive));
895 }
896 else {
897 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
898 ++rq->errors;
899 ide_do_reset(drive);
900 return;
901 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
902 drive->special.b.recalibrate = 1;
903 ++rq->errors;
904 }
905 }
906
907 /*
908 * read_intr() is the handler for disk read/multread interrupts
909 */
910 static void read_intr (ide_drive_t *drive)
/* */
911 {
912 byte stat;
913 int i;
914 unsigned int msect, nsect;
915 struct request *rq;
916
917 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
918 ide_error(drive, "read_intr", stat);
919 return;
920 }
921 msect = drive->mult_count;
922 read_next:
923 rq = HWGROUP(drive)->rq;
924 if (msect) {
925 if ((nsect = rq->current_nr_sectors) > msect)
926 nsect = msect;
927 msect -= nsect;
928 } else
929 nsect = 1;
930 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
931 #ifdef DEBUG
932 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
933 drive->name, rq->sector, rq->sector+nsect-1,
934 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
935 #endif
936 rq->sector += nsect;
937 rq->buffer += nsect<<9;
938 rq->errors = 0;
939 i = (rq->nr_sectors -= nsect);
940 if ((rq->current_nr_sectors -= nsect) <= 0)
941 ide_end_request(1, HWGROUP(drive));
942 if (i > 0) {
943 if (msect)
944 goto read_next;
945 ide_set_handler (drive, &read_intr, WAIT_CMD);
946 }
947 }
948
949 /*
950 * write_intr() is the handler for disk write interrupts
951 */
952 static void write_intr (ide_drive_t *drive)
/* */
953 {
954 byte stat;
955 int i;
956 ide_hwgroup_t *hwgroup = HWGROUP(drive);
957 struct request *rq = hwgroup->rq;
958
959 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
960 #ifdef DEBUG
961 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
962 drive->name, rq->sector, (unsigned long) rq->buffer,
963 rq->nr_sectors-1);
964 #endif
965 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
966 rq->sector++;
967 rq->buffer += 512;
968 rq->errors = 0;
969 i = --rq->nr_sectors;
970 --rq->current_nr_sectors;
971 if (rq->current_nr_sectors <= 0)
972 ide_end_request(1, hwgroup);
973 if (i > 0) {
974 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
975 ide_set_handler (drive, &write_intr, WAIT_CMD);
976 }
977 return;
978 }
979 }
980 ide_error(drive, "write_intr", stat);
981 }
982
983 /*
984 * multwrite() transfers a block of one or more sectors of data to a drive
985 * as part of a disk multwrite operation.
986 */
987 static void multwrite (ide_drive_t *drive)
/* */
988 {
989 struct request *rq = &HWGROUP(drive)->wrq;
990 unsigned int mcount = drive->mult_count;
991
992 do {
993 unsigned int nsect = rq->current_nr_sectors;
994 if (nsect > mcount)
995 nsect = mcount;
996 mcount -= nsect;
997
998 ide_output_data(drive, rq->buffer, nsect<<7);
999 #ifdef DEBUG
1000 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1001 drive->name, rq->sector, (unsigned long) rq->buffer,
1002 nsect, rq->nr_sectors - nsect);
1003 #endif
1004 if ((rq->nr_sectors -= nsect) <= 0)
1005 break;
1006 if ((rq->current_nr_sectors -= nsect) == 0) {
1007 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1008 rq->current_nr_sectors = rq->bh->b_size>>9;
1009 rq->buffer = rq->bh->b_data;
1010 } else {
1011 panic("%s: buffer list corrupted\n", drive->name);
1012 break;
1013 }
1014 } else {
1015 rq->buffer += nsect << 9;
1016 }
1017 } while (mcount);
1018 }
1019
1020 /*
1021 * multwrite_intr() is the handler for disk multwrite interrupts
1022 */
1023 static void multwrite_intr (ide_drive_t *drive)
/* */
1024 {
1025 byte stat;
1026 int i;
1027 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1028 struct request *rq = &hwgroup->wrq;
1029
1030 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1031 if (stat & DRQ_STAT) {
1032 if (rq->nr_sectors) {
1033 multwrite(drive);
1034 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1035 return;
1036 }
1037 } else {
1038 if (!rq->nr_sectors) { /* all done? */
1039 rq = hwgroup->rq;
1040 for (i = rq->nr_sectors; i > 0;){
1041 i -= rq->current_nr_sectors;
1042 ide_end_request(1, hwgroup);
1043 }
1044 return;
1045 }
1046 }
1047 }
1048 ide_error(drive, "multwrite_intr", stat);
1049 }
1050
1051 /*
1052 * Issue a simple drive command
1053 * The drive must be selected beforehand.
1054 */
1055 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1056 {
1057 ide_set_handler (drive, handler, WAIT_CMD);
1058 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1059 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1060 OUT_BYTE(cmd,IDE_COMMAND_REG);
1061 }
1062
1063 /*
1064 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1065 */
1066 static void set_multmode_intr (ide_drive_t *drive)
/* */
1067 {
1068 byte stat = GET_STAT();
1069
1070 sti();
1071 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1072 drive->mult_count = drive->mult_req;
1073 } else {
1074 drive->mult_req = drive->mult_count = 0;
1075 drive->special.b.recalibrate = 1;
1076 (void) ide_dump_status(drive, "set_multmode", stat);
1077 }
1078 }
1079
1080 /*
1081 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1082 */
1083 static void set_geometry_intr (ide_drive_t *drive)
/* */
1084 {
1085 byte stat = GET_STAT();
1086
1087 sti();
1088 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1089 ide_error(drive, "set_geometry_intr", stat);
1090 }
1091
1092 /*
1093 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1094 */
1095 static void recal_intr (ide_drive_t *drive)
/* */
1096 {
1097 byte stat = GET_STAT();
1098
1099 sti();
1100 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1101 ide_error(drive, "recal_intr", stat);
1102 }
1103
1104 /*
1105 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1106 */
1107 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1108 {
1109 byte stat = GET_STAT();
1110
1111 sti();
1112 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1113 ide_end_drive_cmd (drive, stat, GET_ERR());
1114 else
1115 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1116 }
1117
1118 /*
1119 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1120 * commands to a drive. It used to do much more, but has been scaled back.
1121 */
1122 static inline void do_special (ide_drive_t *drive)
/* */
1123 {
1124 special_t *s = &drive->special;
1125 next:
1126 #ifdef DEBUG
1127 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1128 #endif
1129 if (s->b.set_geometry) {
1130 s->b.set_geometry = 0;
1131 if (drive->media == ide_disk) {
1132 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1133 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1134 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1135 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1136 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1137 }
1138 } else if (s->b.recalibrate) {
1139 s->b.recalibrate = 0;
1140 if (drive->media == ide_disk) {
1141 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1142 }
1143 } else if (s->b.set_pio) {
1144 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1145 s->b.set_pio = 0;
1146 if (tuneproc != NULL)
1147 tuneproc(drive, drive->pio_req);
1148 goto next;
1149 } else if (s->b.set_multmode) {
1150 s->b.set_multmode = 0;
1151 if (drive->media == ide_disk) {
1152 if (drive->id && drive->mult_req > drive->id->max_multsect)
1153 drive->mult_req = drive->id->max_multsect;
1154 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1155 } else
1156 drive->mult_req = 0;
1157 } else if (s->all) {
1158 int special = s->all;
1159 s->all = 0;
1160 printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1161 }
1162 }
1163
1164 /*
1165 * This routine busy-waits for the drive status to be not "busy".
1166 * It then checks the status for all of the "good" bits and none
1167 * of the "bad" bits, and if all is okay it returns 0. All other
1168 * cases return 1 after invoking ide_error() -- caller should just return.
1169 *
1170 * This routine should get fixed to not hog the cpu during extra long waits..
1171 * That could be done by busy-waiting for the first jiffy or two, and then
1172 * setting a timer to wake up at half second intervals thereafter,
1173 * until timeout is achieved, before timing out.
1174 */
1175 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1176 {
1177 byte stat;
1178 unsigned long flags;
1179
1180 test:
1181 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1182 if (OK_STAT((stat = GET_STAT()), good, bad))
1183 return 0; /* fast exit for most frequent case */
1184 if (!(stat & BUSY_STAT)) {
1185 ide_error(drive, "status error", stat);
1186 return 1;
1187 }
1188
1189 save_flags(flags);
1190 sti();
1191 timeout += jiffies;
1192 do {
1193 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1194 restore_flags(flags);
1195 goto test;
1196 }
1197 } while (jiffies <= timeout);
1198
1199 restore_flags(flags);
1200 ide_error(drive, "status timeout", GET_STAT());
1201 return 1;
1202 }
1203
1204 /*
1205 * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1206 * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1207 * care of issuing special DRIVE_CMDs.
1208 */
1209 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1210 {
1211 unsigned short io_base = HWIF(drive)->io_base;
1212
1213 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1214 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1215 if (drive->select.b.lba) {
1216 #ifdef DEBUG
1217 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1218 drive->name, (rq->cmd==READ)?"read":"writ",
1219 block, rq->nr_sectors, (unsigned long) rq->buffer);
1220 #endif
1221 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1222 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1223 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1224 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1225 } else {
1226 unsigned int sect,head,cyl,track;
1227 track = block / drive->sect;
1228 sect = block % drive->sect + 1;
1229 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1230 head = track % drive->head;
1231 cyl = track / drive->head;
1232 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1233 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1234 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1235 #ifdef DEBUG
1236 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1237 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1238 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1239 #endif
1240 }
1241 if (rq->cmd == READ) {
1242 #ifdef CONFIG_BLK_DEV_TRITON
1243 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1244 return;
1245 #endif /* CONFIG_BLK_DEV_TRITON */
1246 ide_set_handler(drive, &read_intr, WAIT_CMD);
1247 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1248 return;
1249 }
1250 if (rq->cmd == WRITE) {
1251 #ifdef CONFIG_BLK_DEV_TRITON
1252 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1253 return;
1254 #endif /* CONFIG_BLK_DEV_TRITON */
1255 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1256 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1257 printk("%s: no DRQ after issuing %s\n", drive->name,
1258 drive->mult_count ? "MULTWRITE" : "WRITE");
1259 return;
1260 }
1261 if (!drive->unmask)
1262 cli();
1263 if (drive->mult_count) {
1264 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1265 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1266 multwrite(drive);
1267 } else {
1268 ide_set_handler (drive, &write_intr, WAIT_CMD);
1269 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1270 }
1271 return;
1272 }
1273 if (rq->cmd == IDE_DRIVE_CMD) {
1274 byte *args = rq->buffer;
1275 if (args) {
1276 #ifdef DEBUG
1277 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1278 drive->name, args[0], args[1], args[2]);
1279 #endif
1280 OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1281 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1282 return;
1283 } else {
1284 /*
1285 * NULL is actually a valid way of waiting for
1286 * all current requests to be flushed from the queue.
1287 */
1288 #ifdef DEBUG
1289 printk("%s: DRIVE_CMD (null)\n", drive->name);
1290 #endif
1291 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1292 return;
1293 }
1294 }
1295 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1296 ide_end_request(0, HWGROUP(drive));
1297 }
1298
1299 /*
1300 * do_request() initiates handling of a new I/O request
1301 */
1302 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1303 {
1304 unsigned int minor, unit;
1305 unsigned long block, blockend;
1306 ide_drive_t *drive;
1307
1308 sti();
1309 #ifdef DEBUG
1310 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1311 #endif
1312 minor = MINOR(rq->rq_dev);
1313 unit = minor >> PARTN_BITS;
1314 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1315 printk("%s: bad device number: %s\n",
1316 hwif->name, kdevname(rq->rq_dev));
1317 goto kill_rq;
1318 }
1319 drive = &hwif->drives[unit];
1320 #ifdef DEBUG
1321 if (rq->bh && !buffer_locked(rq->bh)) {
1322 printk("%s: block not locked\n", drive->name);
1323 goto kill_rq;
1324 }
1325 #endif
1326 block = rq->sector;
1327 blockend = block + rq->nr_sectors;
1328 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1329 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1330 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1331 goto kill_rq;
1332 }
1333 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1334 #if FAKE_FDISK_FOR_EZDRIVE
1335 if (block == 0 && drive->remap_0_to_1)
1336 block = 1; /* redirect MBR access to EZ-Drive partn table */
1337 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1338 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1339 #ifdef CONFIG_BLK_DEV_HT6560B
1340 if (hwif->selectproc)
1341 hwif->selectproc (drive);
1342 #endif /* CONFIG_BLK_DEV_HT6560B */
1343 #if (DISK_RECOVERY_TIME > 0)
1344 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1345 #endif
1346
1347 #ifdef CONFIG_BLK_DEV_IDETAPE
1348 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1349 #endif /* CONFIG_BLK_DEV_IDETAPE */
1350
1351 OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1352 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1353 printk("%s: drive not ready for command\n", drive->name);
1354 return;
1355 }
1356
1357 if (!drive->special.all) {
1358 #ifdef CONFIG_BLK_DEV_IDEATAPI
1359 switch (drive->media) {
1360 case ide_disk:
1361 do_rw_disk (drive, rq, block);
1362 return;
1363 #ifdef CONFIG_BLK_DEV_IDECD
1364 case ide_cdrom:
1365 ide_do_rw_cdrom (drive, block);
1366 return;
1367 #endif /* CONFIG_BLK_DEV_IDECD */
1368 #ifdef CONFIG_BLK_DEV_IDETAPE
1369 case ide_tape:
1370 if (rq->cmd == IDE_DRIVE_CMD) {
1371 byte *args = (byte *) rq->buffer;
1372 OUT_BYTE(args[2],IDE_FEATURE_REG);
1373 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1374 return;
1375 }
1376 idetape_do_request (drive, rq, block);
1377 return;
1378 #endif /* CONFIG_BLK_DEV_IDETAPE */
1379
1380 default:
1381 printk("%s: media type %d not supported\n",
1382 drive->name, drive->media);
1383 goto kill_rq;
1384 }
1385 #else
1386 do_rw_disk (drive, rq, block); /* simpler and faster */
1387 return;
1388 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1389 }
1390 do_special(drive);
1391 return;
1392 kill_rq:
1393 ide_end_request(0, hwif->hwgroup);
1394 }
1395
1396 /*
1397 * The driver enables interrupts as much as possible. In order to do this,
1398 * (a) the device-interrupt is always masked before entry, and
1399 * (b) the timeout-interrupt is always disabled before entry.
1400 *
1401 * If we enter here from, say irq14, and then start a new request for irq15,
1402 * (possible with "serialize" option) then we cannot ensure that we exit
1403 * before the irq15 hits us. So, we must be careful not to let this bother us.
1404 *
1405 * Interrupts are still masked (by default) whenever we are exchanging
1406 * data/cmds with a drive, because some drives seem to have very poor
1407 * tolerance for latency during I/O. For devices which don't suffer from
1408 * this problem (most don't), the unmask flag can be set using the "hdparm"
1409 * utility, to permit other interrupts during data/cmd transfers.
1410 */
1411 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1412 {
1413 cli(); /* paranoia */
1414 if (hwgroup->handler != NULL) {
1415 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1416 return;
1417 }
1418 do {
1419 ide_hwif_t *hwif = hwgroup->hwif;
1420 struct request *rq;
1421 if ((rq = hwgroup->rq) == NULL) {
1422 do {
1423 rq = blk_dev[hwif->major].current_request;
1424 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1425 goto got_rq;
1426 } while ((hwif = hwif->next) != hwgroup->hwif);
1427 return; /* no work left for this hwgroup */
1428 }
1429 got_rq:
1430 do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1431 cli();
1432 } while (hwgroup->handler == NULL);
1433 }
1434
1435 /*
1436 * do_hwgroup_request() invokes ide_do_request() after first masking
1437 * all possible interrupts for the current hwgroup. This prevents race
1438 * conditions in the event that an unexpected interrupt occurs while
1439 * we are in the driver.
1440 *
1441 * Note that when an interrupt is used to reenter the driver, the first level
1442 * handler will already have masked the irq that triggered, but any other ones
1443 * for the hwgroup will still be unmasked. The driver tries to be careful
1444 * about such things.
1445 */
1446 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1447 {
1448 if (hwgroup->handler == NULL) {
1449 ide_hwif_t *hgif = hwgroup->hwif;
1450 ide_hwif_t *hwif = hgif;
1451 do {
1452 disable_irq(hwif->irq);
1453 } while ((hwif = hwif->next) != hgif);
1454 ide_do_request (hwgroup);
1455 do {
1456 enable_irq(hwif->irq);
1457 } while ((hwif = hwif->next) != hgif);
1458 }
1459 }
1460
1461 static void do_ide0_request (void) /* invoked with cli() */
/* */
1462 {
1463 do_hwgroup_request (ide_hwifs[0].hwgroup);
1464 }
1465
1466 #if MAX_HWIFS > 1
1467 static void do_ide1_request (void) /* invoked with cli() */
/* */
1468 {
1469 do_hwgroup_request (ide_hwifs[1].hwgroup);
1470 }
1471 #endif
1472
1473 #if MAX_HWIFS > 2
1474 static void do_ide2_request (void) /* invoked with cli() */
/* */
1475 {
1476 do_hwgroup_request (ide_hwifs[2].hwgroup);
1477 }
1478 #endif
1479
1480 #if MAX_HWIFS > 3
1481 static void do_ide3_request (void) /* invoked with cli() */
/* */
1482 {
1483 do_hwgroup_request (ide_hwifs[3].hwgroup);
1484 }
1485 #endif
1486
1487 static void timer_expiry (unsigned long data)
/* */
1488 {
1489 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1490 ide_drive_t *drive = hwgroup->drive;
1491 unsigned long flags;
1492
1493 save_flags(flags);
1494 cli();
1495
1496 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1497 ide_handler_t *handler = hwgroup->handler;
1498 hwgroup->handler = NULL;
1499 handler(drive);
1500 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1501 sti(); /* drive must have responded just as the timer expired */
1502 printk("%s: marginal timeout\n", drive->name);
1503 } else {
1504 hwgroup->handler = NULL; /* abort the operation */
1505 if (hwgroup->hwif->dmaproc)
1506 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1507 ide_error(drive, "irq timeout", GET_STAT());
1508 }
1509 if (hwgroup->handler == NULL)
1510 do_hwgroup_request (hwgroup);
1511 restore_flags(flags);
1512 }
1513
1514 /*
1515 * There's nothing really useful we can do with an unexpected interrupt,
1516 * other than reading the status register (to clear it), and logging it.
1517 * There should be no way that an irq can happen before we're ready for it,
1518 * so we needn't worry much about losing an "important" interrupt here.
1519 *
1520 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1521 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1522 * "good", we just ignore the interrupt completely.
1523 *
1524 * This routine assumes cli() is in effect when called.
1525 *
1526 * If an unexpected interrupt happens on irq15 while we are handling irq14
1527 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1528 * we could screw up by interfering with a new request being set up for irq15.
1529 *
1530 * In reality, this is a non-issue. The new command is not sent unless the
1531 * drive is ready to accept one, in which case we know the drive is not
1532 * trying to interrupt us. And ide_set_handler() is always invoked before
1533 * completing the issuance of any new drive command, so we will not be
1534 * accidently invoked as a result of any valid command completion interrupt.
1535 *
1536 */
1537 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1538 {
1539 byte stat;
1540 unsigned int unit;
1541 ide_hwif_t *hwif = hwgroup->hwif;
1542
1543 /*
1544 * handle the unexpected interrupt
1545 */
1546 do {
1547 if (hwif->irq == irq) {
1548 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1549 ide_drive_t *drive = &hwif->drives[unit];
1550 if (!drive->present)
1551 continue;
1552 #ifdef CONFIG_BLK_DEV_HT6560B
1553 if (hwif->selectproc)
1554 hwif->selectproc (drive);
1555 #endif /* CONFIG_BLK_DEV_HT6560B */
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 #ifdef CONFIG_BLK_DEV_HT6560B
1564 if (hwif->selectproc)
1565 hwif->selectproc (hwgroup->drive);
1566 #endif /* CONFIG_BLK_DEV_HT6560B */
1567 }
1568
1569 /*
1570 * entry point for all interrupts, caller does cli() for us
1571 */
1572 static void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1573 {
1574 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1575 ide_handler_t *handler;
1576
1577 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1578 ide_drive_t *drive = hwgroup->drive;
1579 hwgroup->handler = NULL;
1580 del_timer(&(hwgroup->timer));
1581 if (drive->unmask)
1582 sti();
1583 handler(drive);
1584 cli(); /* this is necessary, as next rq may be different irq */
1585 if (hwgroup->handler == NULL) {
1586 SET_RECOVERY_TIMER(HWIF(drive));
1587 ide_do_request(hwgroup);
1588 }
1589 } else {
1590 unexpected_intr(irq, hwgroup);
1591 }
1592 cli();
1593 }
1594
1595 /*
1596 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1597 * It returns NULL if the given device number does not match any present drives.
1598 */
1599 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1600 {
1601 int major = MAJOR(i_rdev);
1602 unsigned int h;
1603
1604 for (h = 0; h < MAX_HWIFS; ++h) {
1605 ide_hwif_t *hwif = &ide_hwifs[h];
1606 if (hwif->present && major == hwif->major) {
1607 unsigned unit = DEVICE_NR(i_rdev);
1608 if (unit < MAX_DRIVES) {
1609 ide_drive_t *drive = &hwif->drives[unit];
1610 if (drive->present)
1611 return drive;
1612 } else if (major == IDE0_MAJOR && unit < 4) {
1613 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1614 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1615 }
1616 break;
1617 }
1618 }
1619 return NULL;
1620 }
1621
1622 /*
1623 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1624 */
1625 void ide_init_drive_cmd (struct request *rq)
/* */
1626 {
1627 rq->buffer = NULL;
1628 rq->cmd = IDE_DRIVE_CMD;
1629 rq->sector = 0;
1630 rq->nr_sectors = 0;
1631 rq->current_nr_sectors = 0;
1632 rq->sem = NULL;
1633 rq->bh = NULL;
1634 rq->bhtail = NULL;
1635 rq->next = NULL;
1636
1637 #if 0 /* these are done each time through ide_do_drive_cmd() */
1638 rq->errors = 0;
1639 rq->rq_status = RQ_ACTIVE;
1640 rq->rq_dev = ????;
1641 #endif
1642 }
1643
1644 /*
1645 * This function issues a special IDE device request
1646 * onto the request queue.
1647 *
1648 * If action is ide_wait, then then rq is queued at the end of
1649 * the request queue, and the function sleeps until it has been
1650 * processed. This is for use when invoked from an ioctl handler.
1651 *
1652 * If action is ide_preempt, then the rq is queued at the head of
1653 * the request queue, displacing the currently-being-processed
1654 * request and this function returns immediately without waiting
1655 * for the new rq to be completed. This is VERY DANGEROUS, and is
1656 * intended for careful use by the ATAPI tape/cdrom driver code.
1657 *
1658 * If action is ide_next, then the rq is queued immediately after
1659 * the currently-being-processed-request (if any), and the function
1660 * returns without waiting for the new rq to be completed. As above,
1661 * This is VERY DANGEROUS, and is intended for careful use by the
1662 * ATAPI tape/cdrom driver code.
1663 *
1664 * If action is ide_end, then the rq is queued at the end of the
1665 * request queue, and the function returns immediately without waiting
1666 * for the new rq to be completed. This is again intended for careful
1667 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1668 * when operating in the pipelined operation mode).
1669 */
1670 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1671 {
1672 unsigned long flags;
1673 unsigned int major = HWIF(drive)->major;
1674 struct request *cur_rq;
1675 struct blk_dev_struct *bdev = &blk_dev[major];
1676 struct semaphore sem = MUTEX_LOCKED;
1677
1678 rq->errors = 0;
1679 rq->rq_status = RQ_ACTIVE;
1680 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1681 if (action == ide_wait)
1682 rq->sem = &sem;
1683
1684 save_flags(flags);
1685 cli();
1686 cur_rq = bdev->current_request;
1687
1688 if (cur_rq == NULL || action == ide_preempt) {
1689 rq->next = cur_rq;
1690 bdev->current_request = rq;
1691 if (action == ide_preempt) {
1692 HWGROUP(drive)->rq = NULL;
1693 } else
1694 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1695 bdev->request_fn();
1696 cli();
1697 }
1698 } else {
1699 if (action == ide_wait || action == ide_end) {
1700 while (cur_rq->next != NULL) /* find end of list */
1701 cur_rq = cur_rq->next;
1702 }
1703 rq->next = cur_rq->next;
1704 cur_rq->next = rq;
1705 }
1706 if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1707 down(&sem); /* wait for it to be serviced */
1708 restore_flags(flags);
1709 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1710 }
1711
1712 static int ide_open(struct inode * inode, struct file * filp)
/* */
1713 {
1714 ide_drive_t *drive;
1715 unsigned long flags;
1716
1717 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1718 return -ENODEV;
1719 save_flags(flags);
1720 cli();
1721 while (drive->busy)
1722 sleep_on(&drive->wqueue);
1723 drive->usage++;
1724 restore_flags(flags);
1725 #ifdef CONFIG_BLK_DEV_IDECD
1726 if (drive->media == ide_cdrom)
1727 return ide_cdrom_open (inode, filp, drive);
1728 #endif /* CONFIG_BLK_DEV_IDECD */
1729 #ifdef CONFIG_BLK_DEV_IDETAPE
1730 if (drive->media == ide_tape)
1731 return idetape_blkdev_open (inode, filp, drive);
1732 #endif /* CONFIG_BLK_DEV_IDETAPE */
1733 if (drive->removeable) {
1734 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1735 struct request rq;
1736 check_disk_change(inode->i_rdev);
1737 ide_init_drive_cmd (&rq);
1738 rq.buffer = door_lock;
1739 /*
1740 * Ignore the return code from door_lock,
1741 * since the open() has already succeeded,
1742 * and the door_lock is irrelevant at this point.
1743 */
1744 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1745 }
1746 return 0;
1747 }
1748
1749 /*
1750 * Releasing a block device means we sync() it, so that it can safely
1751 * be forgotten about...
1752 */
1753 static void ide_release(struct inode * inode, struct file * file)
/* */
1754 {
1755 ide_drive_t *drive;
1756
1757 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1758 sync_dev(inode->i_rdev);
1759 drive->usage--;
1760 #ifdef CONFIG_BLK_DEV_IDECD
1761 if (drive->media == ide_cdrom) {
1762 ide_cdrom_release (inode, file, drive);
1763 return;
1764 }
1765 #endif /* CONFIG_BLK_DEV_IDECD */
1766 #ifdef CONFIG_BLK_DEV_IDETAPE
1767 if (drive->media == ide_tape) {
1768 idetape_blkdev_release (inode, file, drive);
1769 return;
1770 }
1771 #endif /* CONFIG_BLK_DEV_IDETAPE */
1772 if (drive->removeable) {
1773 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1774 struct request rq;
1775 invalidate_buffers(inode->i_rdev);
1776 ide_init_drive_cmd (&rq);
1777 rq.buffer = door_unlock;
1778 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1779 }
1780 }
1781 }
1782
1783 /*
1784 * This routine is called to flush all partitions and partition tables
1785 * for a changed disk, and then re-read the new partition table.
1786 * If we are revalidating a disk because of a media change, then we
1787 * enter with usage == 0. If we are using an ioctl, we automatically have
1788 * usage == 1 (we need an open channel to use an ioctl :-), so this
1789 * is our limit.
1790 */
1791 static int revalidate_disk(kdev_t i_rdev)
/* */
1792 {
1793 ide_drive_t *drive;
1794 unsigned int p, major, minor;
1795 long flags;
1796
1797 if ((drive = get_info_ptr(i_rdev)) == NULL)
1798 return -ENODEV;
1799
1800 major = MAJOR(i_rdev);
1801 minor = drive->select.b.unit << PARTN_BITS;
1802 save_flags(flags);
1803 cli();
1804 if (drive->busy || (drive->usage > 1)) {
1805 restore_flags(flags);
1806 return -EBUSY;
1807 };
1808 drive->busy = 1;
1809 restore_flags(flags);
1810
1811 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1812 if (drive->part[p].nr_sects > 0) {
1813 kdev_t devp = MKDEV(major, minor+p);
1814 sync_dev (devp);
1815 invalidate_inodes (devp);
1816 invalidate_buffers (devp);
1817 }
1818 drive->part[p].start_sect = 0;
1819 drive->part[p].nr_sects = 0;
1820 };
1821
1822 drive->part[0].nr_sects = current_capacity(drive);
1823 if (drive->media == ide_disk)
1824 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1825
1826 drive->busy = 0;
1827 wake_up(&drive->wqueue);
1828 return 0;
1829 }
1830
1831 static int write_fs_long (unsigned long useraddr, long value)
/* */
1832 {
1833 int err;
1834
1835 if (NULL == (long *)useraddr)
1836 return -EINVAL;
1837 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1838 return err;
1839 put_user((unsigned)value, (long *) useraddr);
1840 return 0;
1841 }
1842
1843 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1844 unsigned int cmd, unsigned long arg)
1845 {
1846 struct hd_geometry *loc = (struct hd_geometry *) arg;
1847 int err;
1848 ide_drive_t *drive;
1849 unsigned long flags;
1850 struct request rq;
1851
1852 ide_init_drive_cmd (&rq);
1853 if (!inode || !(inode->i_rdev))
1854 return -EINVAL;
1855 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1856 return -ENODEV;
1857 switch (cmd) {
1858 case HDIO_GETGEO:
1859 if (!loc || drive->media != ide_disk) return -EINVAL;
1860 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1861 if (err) return err;
1862 put_user(drive->bios_head, (byte *) &loc->heads);
1863 put_user(drive->bios_sect, (byte *) &loc->sectors);
1864 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1865 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1866 (unsigned long *) &loc->start);
1867 return 0;
1868
1869 case BLKFLSBUF:
1870 if(!suser()) return -EACCES;
1871 fsync_dev(inode->i_rdev);
1872 invalidate_buffers(inode->i_rdev);
1873 return 0;
1874
1875 case BLKRASET:
1876 if(!suser()) return -EACCES;
1877 if(arg > 0xff) return -EINVAL;
1878 read_ahead[MAJOR(inode->i_rdev)] = arg;
1879 return 0;
1880
1881 case BLKRAGET:
1882 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1883
1884 case BLKGETSIZE: /* Return device size */
1885 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1886 case BLKRRPART: /* Re-read partition tables */
1887 return revalidate_disk(inode->i_rdev);
1888
1889 case HDIO_GET_KEEPSETTINGS:
1890 return write_fs_long(arg, drive->keep_settings);
1891
1892 case HDIO_GET_UNMASKINTR:
1893 return write_fs_long(arg, drive->unmask);
1894
1895 case HDIO_GET_DMA:
1896 return write_fs_long(arg, drive->using_dma);
1897
1898 case HDIO_GET_32BIT:
1899 return write_fs_long(arg, drive->io_32bit);
1900
1901 case HDIO_GET_MULTCOUNT:
1902 return write_fs_long(arg, drive->mult_count);
1903
1904 case HDIO_GET_IDENTITY:
1905 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1906 return -EINVAL;
1907 if (drive->id == NULL)
1908 return -ENOMSG;
1909 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1910 if (!err)
1911 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1912 return err;
1913
1914 case HDIO_GET_NOWERR:
1915 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1916
1917 case HDIO_SET_DMA:
1918 #ifdef CONFIG_BLK_DEV_IDECD
1919 if (drive->media == ide_cdrom)
1920 return -EPERM;
1921 #endif /* CONFIG_BLK_DEV_IDECD */
1922 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1923 return -EPERM;
1924 case HDIO_SET_KEEPSETTINGS:
1925 case HDIO_SET_UNMASKINTR:
1926 case HDIO_SET_NOWERR:
1927 if (arg > 1)
1928 return -EINVAL;
1929 case HDIO_SET_32BIT:
1930 if (!suser())
1931 return -EACCES;
1932 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1933 return -EINVAL;
1934 save_flags(flags);
1935 cli();
1936 switch (cmd) {
1937 case HDIO_SET_DMA:
1938 if (!(HWIF(drive)->dmaproc)) {
1939 restore_flags(flags);
1940 return -EPERM;
1941 }
1942 drive->using_dma = arg;
1943 break;
1944 case HDIO_SET_KEEPSETTINGS:
1945 drive->keep_settings = arg;
1946 break;
1947 case HDIO_SET_UNMASKINTR:
1948 if (arg && HWIF(drive)->no_unmask) {
1949 restore_flags(flags);
1950 return -EPERM;
1951 }
1952 drive->unmask = arg;
1953 break;
1954 case HDIO_SET_NOWERR:
1955 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1956 break;
1957 case HDIO_SET_32BIT:
1958 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
1959 return -EINVAL;
1960 drive->io_32bit = arg;
1961 #ifdef CONFIG_BLK_DEV_DTC2278
1962 if (HWIF(drive)->chipset == ide_dtc2278)
1963 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
1964 #endif /* CONFIG_BLK_DEV_DTC2278 */
1965 break;
1966 }
1967 restore_flags(flags);
1968 return 0;
1969
1970 case HDIO_SET_MULTCOUNT:
1971 if (!suser())
1972 return -EACCES;
1973 if (MINOR(inode->i_rdev) & PARTN_MASK)
1974 return -EINVAL;
1975 if (drive->id && arg > drive->id->max_multsect)
1976 return -EINVAL;
1977 save_flags(flags);
1978 cli();
1979 if (drive->special.b.set_multmode) {
1980 restore_flags(flags);
1981 return -EBUSY;
1982 }
1983 drive->mult_req = arg;
1984 drive->special.b.set_multmode = 1;
1985 restore_flags(flags);
1986 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
1987 return (drive->mult_count == arg) ? 0 : -EIO;
1988
1989 case HDIO_DRIVE_CMD:
1990 {
1991 unsigned long args;
1992
1993 if (NULL == (long *) arg)
1994 err = ide_do_drive_cmd(drive, &rq, ide_wait);
1995 else {
1996 if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1997 {
1998 args = get_user((long *)arg);
1999 if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
2000 rq.buffer = (char *) &args;
2001 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2002 put_user(args,(long *)arg);
2003 }
2004 }
2005 }
2006 return err;
2007 }
2008 case HDIO_SET_PIO_MODE:
2009 if (!suser())
2010 return -EACCES;
2011 if (MINOR(inode->i_rdev) & PARTN_MASK)
2012 return -EINVAL;
2013 if (!HWIF(drive)->tuneproc)
2014 return -ENOSYS;
2015 save_flags(flags);
2016 cli();
2017 drive->pio_req = (int) arg;
2018 drive->special.b.set_pio = 1;
2019 restore_flags(flags);
2020 return 0;
2021
2022 RO_IOCTLS(inode->i_rdev, arg);
2023
2024 default:
2025 #ifdef CONFIG_BLK_DEV_IDECD
2026 if (drive->media == ide_cdrom)
2027 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2028 #endif /* CONFIG_BLK_DEV_IDECD */
2029 #ifdef CONFIG_BLK_DEV_IDETAPE
2030 if (drive->media == ide_tape)
2031 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2032 #endif /* CONFIG_BLK_DEV_IDETAPE */
2033 return -EPERM;
2034 }
2035 }
2036
2037 static int ide_check_media_change (kdev_t i_rdev)
/* */
2038 {
2039 ide_drive_t *drive;
2040
2041 if ((drive = get_info_ptr(i_rdev)) == NULL)
2042 return -ENODEV;
2043 #ifdef CONFIG_BLK_DEV_IDECD
2044 if (drive->media == ide_cdrom)
2045 return ide_cdrom_check_media_change (drive);
2046 #endif /* CONFIG_BLK_DEV_IDECD */
2047 if (drive->removeable) /* for disks */
2048 return 1; /* always assume it was changed */
2049 return 0;
2050 }
2051
2052 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2053 {
2054 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2055
2056 if (byteswap) {
2057 /* convert from big-endian to host byte order */
2058 for (p = end ; p != s;) {
2059 unsigned short *pp = (unsigned short *) (p -= 2);
2060 *pp = ntohs(*pp);
2061 }
2062 }
2063
2064 /* strip leading blanks */
2065 while (s != end && *s == ' ')
2066 ++s;
2067
2068 /* compress internal blanks and strip trailing blanks */
2069 while (s != end && *s) {
2070 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2071 *p++ = *(s-1);
2072 }
2073
2074 /* wipe out trailing garbage */
2075 while (p != end)
2076 *p++ = '\0';
2077 }
2078
2079 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2080 {
2081 int bswap;
2082 struct hd_driveid *id;
2083 unsigned long capacity, check;
2084
2085 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2086 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2087 sti();
2088
2089 /*
2090 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2091 */
2092 if ((id->model[0] == 'P' && id->model[1] == 'M')
2093 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2094 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2095 drive->present = 0;
2096 return;
2097 }
2098
2099 /*
2100 * WIN_IDENTIFY returns little-endian info,
2101 * WIN_PIDENTIFY *usually* returns little-endian info.
2102 */
2103 bswap = 1;
2104 if (cmd == WIN_PIDENTIFY) {
2105 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2106 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2107 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2108 bswap = 0; /* Vertos drives may still be weird */
2109 }
2110 ide_fixstring (id->model, sizeof(id->model), bswap);
2111 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2112 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2113
2114 #ifdef CONFIG_BLK_DEV_IDEATAPI
2115 /*
2116 * Check for an ATAPI device
2117 */
2118 if (cmd == WIN_PIDENTIFY) {
2119 byte type = (id->config >> 8) & 0x1f;
2120 printk("%s: %s, ATAPI ", drive->name, id->model);
2121 switch (type) {
2122 case 0: /* Early cdrom models used zero */
2123 case 5:
2124 #ifdef CONFIG_BLK_DEV_IDECD
2125 printk ("CDROM drive\n");
2126 drive->media = ide_cdrom;
2127 drive->present = 1;
2128 drive->removeable = 1;
2129 return;
2130 #else
2131 printk ("CDROM ");
2132 break;
2133 #endif /* CONFIG_BLK_DEV_IDECD */
2134 case 1:
2135 #ifdef CONFIG_BLK_DEV_IDETAPE
2136 printk ("TAPE drive");
2137 if (idetape_identify_device (drive,id)) {
2138 drive->media = ide_tape;
2139 drive->present = 1;
2140 drive->removeable = 1;
2141 if (HWIF(drive)->dmaproc != NULL &&
2142 !HWIF(drive)->dmaproc(ide_dma_check, drive))
2143 printk(", DMA");
2144 printk("\n");
2145 }
2146 else {
2147 drive->present = 0;
2148 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2149 }
2150 return;
2151 #else
2152 printk ("TAPE ");
2153 break;
2154 #endif /* CONFIG_BLK_DEV_IDETAPE */
2155 default:
2156 drive->present = 0;
2157 printk("Type %d - Unknown device\n", type);
2158 return;
2159 }
2160 drive->present = 0;
2161 printk("- not supported by this kernel\n");
2162 return;
2163 }
2164 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2165
2166 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2167 if (id->config & (1<<7)) { /* removeable disk ? */
2168 if (id->model[0] != 'W' || id->model[1] != 'D')
2169 drive->removeable = 1;
2170 }
2171
2172 /* SunDisk drives: treat as non-removeable, force one unit */
2173 if (id->model[0] == 'S' && id->model[1] == 'u') {
2174 drive->removeable = 0;
2175 if (drive->select.all & (1<<4)) {
2176 drive->present = 0;
2177 return;
2178 }
2179 }
2180
2181 drive->media = ide_disk;
2182 /* Extract geometry if we did not already have one for the drive */
2183 if (!drive->present) {
2184 drive->present = 1;
2185 drive->cyl = drive->bios_cyl = id->cyls;
2186 drive->head = drive->bios_head = id->heads;
2187 drive->sect = drive->bios_sect = id->sectors;
2188 }
2189 /* Handle logical geometry translation by the drive */
2190 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2191 && (id->cur_heads <= 16) && id->cur_sectors)
2192 {
2193 /*
2194 * Extract the physical drive geometry for our use.
2195 * Note that we purposely do *not* update the bios info.
2196 * This way, programs that use it (like fdisk) will
2197 * still have the same logical view as the BIOS does,
2198 * which keeps the partition table from being screwed.
2199 *
2200 * An exception to this is the cylinder count,
2201 * which we reexamine later on to correct for 1024 limitations.
2202 */
2203 drive->cyl = id->cur_cyls;
2204 drive->head = id->cur_heads;
2205 drive->sect = id->cur_sectors;
2206
2207 /* check for word-swapped "capacity" field in id information */
2208 capacity = drive->cyl * drive->head * drive->sect;
2209 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2210 if (check == capacity) { /* was it swapped? */
2211 /* yes, bring it into little-endian order: */
2212 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2213 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2214 }
2215 }
2216 /* Use physical geometry if what we have still makes no sense */
2217 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2218 drive->cyl = id->cyls;
2219 drive->head = id->heads;
2220 drive->sect = id->sectors;
2221 }
2222 /* Correct the number of cyls if the bios value is too small */
2223 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2224 if (drive->cyl > drive->bios_cyl)
2225 drive->bios_cyl = drive->cyl;
2226 }
2227
2228 (void) current_capacity (drive); /* initialize LBA selection */
2229
2230 printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2231 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2232 drive->select.b.lba ? "LBA, " : "",
2233 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2234
2235 drive->mult_count = 0;
2236 if (id->max_multsect) {
2237 drive->mult_req = INITIAL_MULT_COUNT;
2238 if (drive->mult_req > id->max_multsect)
2239 drive->mult_req = id->max_multsect;
2240 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2241 drive->special.b.set_multmode = 1;
2242 }
2243 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2244 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2245 printk(", DMA");
2246 }
2247 printk("\n");
2248 }
2249
2250 /*
2251 * Delay for *at least* 10ms. As we don't know how much time is left
2252 * until the next tick occurs, we wait an extra tick to be safe.
2253 * This is used only during the probing/polling for drives at boot time.
2254 */
2255 static void delay_10ms (void)
/* */
2256 {
2257 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2258 while (timer > jiffies);
2259 }
2260
2261 /*
2262 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2263 * and waits for a response. It also monitors irqs while this is
2264 * happening, in hope of automatically determining which one is
2265 * being used by the interface.
2266 *
2267 * Returns: 0 device was identified
2268 * 1 device timed-out (no response to identify request)
2269 * 2 device aborted the command (refused to identify itself)
2270 */
2271 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2272 {
2273 int hd_status, rc;
2274 unsigned long timeout;
2275 int irqs = 0;
2276
2277 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2278 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2279 irqs = probe_irq_on(); /* start monitoring irqs */
2280 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2281 }
2282
2283 delay_10ms(); /* take a deep breath */
2284 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2285 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2286 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2287 } else
2288 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2289
2290 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2291 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2292 timeout += jiffies;
2293 do {
2294 if (jiffies > timeout) {
2295 if (!HWIF(drive)->irq)
2296 (void) probe_irq_off(irqs);
2297 return 1; /* drive timed-out */
2298 }
2299 delay_10ms(); /* give drive a breather */
2300 } while (IN_BYTE(hd_status) & BUSY_STAT);
2301
2302 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2303 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2304 cli(); /* some systems need this */
2305 do_identify(drive, cmd); /* drive returned ID */
2306 if (drive->present && drive->media != ide_tape) {
2307 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2308 if (tuneproc != NULL && drive->autotune == 1)
2309 tuneproc(drive, 255); /* auto-tune PIO mode */
2310 }
2311 rc = 0; /* drive responded with ID */
2312 } else
2313 rc = 2; /* drive refused ID */
2314 if (!HWIF(drive)->irq) {
2315 irqs = probe_irq_off(irqs); /* get irq number */
2316 if (irqs > 0)
2317 HWIF(drive)->irq = irqs;
2318 else /* Mmmm.. multiple IRQs */
2319 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2320 }
2321 return rc;
2322 }
2323
2324 /*
2325 * do_probe() has the difficult job of finding a drive if it exists,
2326 * without getting hung up if it doesn't exist, without trampling on
2327 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2328 *
2329 * If a drive is "known" to exist (from CMOS or kernel parameters),
2330 * but does not respond right away, the probe will "hang in there"
2331 * for the maximum wait time (about 30 seconds), otherwise it will
2332 * exit much more quickly.
2333 *
2334 * Returns: 0 device was identified
2335 * 1 device timed-out (no response to identify request)
2336 * 2 device aborted the command (refused to identify itself)
2337 * 3 bad status from device (possible for ATAPI drives)
2338 * 4 probe was not attempted because failure was obvious
2339 */
2340 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2341 {
2342 int rc;
2343 #ifdef CONFIG_BLK_DEV_IDEATAPI
2344 if (drive->present) { /* avoid waiting for inappropriate probes */
2345 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2346 return 4;
2347 }
2348 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2349 #ifdef DEBUG
2350 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2351 drive->name, drive->present, drive->media,
2352 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2353 #endif
2354 #ifdef CONFIG_BLK_DEV_HT6560B
2355 if (HWIF(drive)->selectproc)
2356 HWIF(drive)->selectproc (drive);
2357 #endif /* CONFIG_BLK_DEV_HT6560B */
2358 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2359 delay_10ms(); /* wait for BUSY_STAT */
2360 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2361 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2362 return 3; /* no i/f present: avoid killing ethernet cards */
2363 }
2364
2365 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2366 || drive->present || cmd == WIN_PIDENTIFY)
2367 {
2368 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2369 rc = try_to_identify(drive,cmd); /* failed: try again */
2370 if (rc == 1)
2371 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2372 (void) GET_STAT(); /* ensure drive irq is clear */
2373 } else {
2374 rc = 3; /* not present or maybe ATAPI */
2375 }
2376 if (drive->select.b.unit != 0) {
2377 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2378 delay_10ms();
2379 (void) GET_STAT(); /* ensure drive irq is clear */
2380 }
2381 return rc;
2382 }
2383
2384 /*
2385 * probe_for_drive() tests for existance of a given drive using do_probe().
2386 *
2387 * Returns: 0 no device was found
2388 * 1 device was found (note: drive->present might still be 0)
2389 */
2390 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2391 {
2392 if (drive->noprobe) /* skip probing? */
2393 return drive->present;
2394 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2395 #ifdef CONFIG_BLK_DEV_IDEATAPI
2396 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2397 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2398 }
2399 if (!drive->present)
2400 return 0; /* drive not found */
2401 if (drive->id == NULL) { /* identification failed? */
2402 if (drive->media == ide_disk) {
2403 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2404 drive->name, drive->cyl, drive->head, drive->sect);
2405 }
2406 #ifdef CONFIG_BLK_DEV_IDECD
2407 else if (drive->media == ide_cdrom) {
2408 printk("%s: ATAPI cdrom (?)\n", drive->name);
2409 }
2410 #endif /* CONFIG_BLK_DEV_IDECD */
2411 else {
2412 drive->present = 0; /* nuke it */
2413 }
2414 }
2415 return 1; /* drive was found */
2416 }
2417
2418 /*
2419 * This routine only knows how to look for drive units 0 and 1
2420 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2421 */
2422 static void probe_hwif (ide_hwif_t *hwif)
/* */
2423 {
2424 unsigned int unit;
2425
2426 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2427 int msgout = 0;
2428 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2429 ide_drive_t *drive = &hwif->drives[unit];
2430 if (drive->present) {
2431 drive->present = 0;
2432 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2433 msgout = 1;
2434 }
2435 }
2436 if (!msgout)
2437 printk("%s: ports already in use, skipping probe\n", hwif->name);
2438 } else {
2439 unsigned long flags;
2440 save_flags(flags);
2441
2442 sti(); /* needed for jiffies and irq probing */
2443 /*
2444 * Second drive should only exist if first drive was found,
2445 * but a lot of cdrom drives are configured as single slaves.
2446 */
2447 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2448 ide_drive_t *drive = &hwif->drives[unit];
2449 (void) probe_for_drive (drive);
2450 if (drive->present && drive->media == ide_disk) {
2451 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2452 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2453 drive->name, drive->head);
2454 drive->present = 0;
2455 }
2456 }
2457 if (drive->present && !hwif->present) {
2458 hwif->present = 1;
2459 request_region(hwif->io_base, 8, hwif->name);
2460 request_region(hwif->ctl_port, 1, hwif->name);
2461 }
2462 }
2463 restore_flags(flags);
2464 }
2465 }
2466
2467 /*
2468 * stridx() returns the offset of c within s,
2469 * or -1 if c is '\0' or not found within s.
2470 */
2471 static int stridx (const char *s, char c)
/* */
2472 {
2473 char *i = strchr(s, c);
2474 return (i && c) ? i - s : -1;
2475 }
2476
2477 /*
2478 * match_parm() does parsing for ide_setup():
2479 *
2480 * 1. the first char of s must be '='.
2481 * 2. if the remainder matches one of the supplied keywords,
2482 * the index (1 based) of the keyword is negated and returned.
2483 * 3. if the remainder is a series of no more than max_vals numbers
2484 * separated by commas, the numbers are saved in vals[] and a
2485 * count of how many were saved is returned. Base10 is assumed,
2486 * and base16 is allowed when prefixed with "0x".
2487 * 4. otherwise, zero is returned.
2488 */
2489 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2490 {
2491 static const char *decimal = "0123456789";
2492 static const char *hex = "0123456789abcdef";
2493 int i, n;
2494
2495 if (*s++ == '=') {
2496 /*
2497 * Try matching against the supplied keywords,
2498 * and return -(index+1) if we match one
2499 */
2500 for (i = 0; *keywords != NULL; ++i) {
2501 if (!strcmp(s, *keywords++))
2502 return -(i+1);
2503 }
2504 /*
2505 * Look for a series of no more than "max_vals"
2506 * numeric values separated by commas, in base10,
2507 * or base16 when prefixed with "0x".
2508 * Return a count of how many were found.
2509 */
2510 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2511 vals[n] = i;
2512 while ((i = stridx(decimal, *++s)) >= 0)
2513 vals[n] = (vals[n] * 10) + i;
2514 if (*s == 'x' && !vals[n]) {
2515 while ((i = stridx(hex, *++s)) >= 0)
2516 vals[n] = (vals[n] * 0x10) + i;
2517 }
2518 if (++n == max_vals)
2519 break;
2520 if (*s == ',')
2521 ++s;
2522 }
2523 if (!*s)
2524 return n;
2525 }
2526 return 0; /* zero = nothing matched */
2527 }
2528
2529 /*
2530 * ide_setup() gets called VERY EARLY during initialization,
2531 * to handle kernel "command line" strings beginning with "hdx="
2532 * or "ide". Here is the complete set currently supported:
2533 *
2534 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2535 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2536 *
2537 * "hdx=noprobe" : drive may be present, but do not probe for it
2538 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2539 * "hdx=cdrom" : drive is present, and is a cdrom drive
2540 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2541 * "hdx=autotune" : driver will attempt to tune interface speed
2542 * to the fastest PIO mode supported,
2543 * if possible for this drive only.
2544 * Not fully supported by all chipset types,
2545 * and quite likely to cause trouble with
2546 * older/odd IDE drives.
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 * "idex=autotune" : driver will attempt to tune interface speed
2555 * to the fastest PIO mode supported,
2556 * for all drives on this interface.
2557 * Not fully supported by all chipset types,
2558 * and quite likely to cause trouble with
2559 * older/odd IDE drives.
2560 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2561 * This is the default for most chipsets,
2562 * except the cmd640.
2563 *
2564 * The following two are valid ONLY on ide0,
2565 * and the defaults for the base,ctl ports must not be altered.
2566 *
2567 * "ide0=serialize" : do not overlap operations on ide0 and ide1.
2568 * "ide0=dtc2278" : probe/support DTC2278 interface
2569 * "ide0=ht6560b" : probe/support HT6560B interface
2570 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2571 * (not for PCI -- automatically detected)
2572 * "ide0=qd6580" : probe/support qd6580 interface
2573 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2574 * "ide0=umc8672" : probe/support umc8672 chipsets
2575 */
2576 void ide_setup (char *s)
/* */
2577 {
2578 int i, vals[3];
2579 ide_hwif_t *hwif;
2580 ide_drive_t *drive;
2581 unsigned int hw, unit;
2582 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2583 const char max_hwif = '0' + (MAX_HWIFS - 1);
2584
2585 printk("ide_setup: %s", s);
2586 init_ide_data ();
2587
2588 /*
2589 * Look for drive options: "hdx="
2590 */
2591 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2592 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2593 "autotune", "noautotune", NULL};
2594 unit = s[2] - 'a';
2595 hw = unit / MAX_DRIVES;
2596 unit = unit % MAX_DRIVES;
2597 hwif = &ide_hwifs[hw];
2598 drive = &hwif->drives[unit];
2599 switch (match_parm(&s[3], hd_words, vals, 3)) {
2600 case -1: /* "noprobe" */
2601 drive->noprobe = 1;
2602 goto done;
2603 case -2: /* "nowerr" */
2604 drive->bad_wstat = BAD_R_STAT;
2605 hwif->noprobe = 0;
2606 goto done;
2607 case -3: /* "cdrom" */
2608 drive->present = 1;
2609 drive->media = ide_cdrom;
2610 hwif->noprobe = 0;
2611 goto done;
2612 case -4: /* "serialize" */
2613 printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
2614 goto do_serialize;
2615 case -5: /* "autotune" */
2616 drive->autotune = 1;
2617 goto done;
2618 case -6: /* "noautotune" */
2619 drive->autotune = 2;
2620 goto done;
2621 case 3: /* cyl,head,sect */
2622 drive->media = ide_disk;
2623 drive->cyl = drive->bios_cyl = vals[0];
2624 drive->head = drive->bios_head = vals[1];
2625 drive->sect = drive->bios_sect = vals[2];
2626 drive->present = 1;
2627 drive->forced_geom = 1;
2628 hwif->noprobe = 0;
2629 goto done;
2630 default:
2631 goto bad_option;
2632 }
2633 }
2634 /*
2635 * Look for interface options: "idex="
2636 */
2637 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2638 /*
2639 * Be VERY CAREFUL changing this: note hardcoded indexes below
2640 */
2641 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2642 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", NULL};
2643 hw = s[3] - '0';
2644 hwif = &ide_hwifs[hw];
2645 i = match_parm(&s[4], ide_words, vals, 3);
2646
2647 /*
2648 * Cryptic check to ensure chipset not already set for hwif:
2649 */
2650 if (i != -1 && i != -2) {
2651 if (hwif->chipset != ide_unknown)
2652 goto bad_option;
2653 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2654 goto bad_option;
2655 }
2656 /*
2657 * Interface keywords work only for ide0:
2658 */
2659 if (i <= -6 && hw != 0)
2660 goto bad_hwif;
2661
2662 switch (i) {
2663 #ifdef CONFIG_BLK_DEV_ALI14XX
2664 case -10: /* "ali14xx" */
2665 {
2666 extern void init_ali14xx (void);
2667 init_ali14xx();
2668 goto done;
2669 }
2670 #endif /* CONFIG_BLK_DEV_ALI14XX */
2671 #ifdef CONFIG_BLK_DEV_UMC8672
2672 case -9: /* "umc8672" */
2673 {
2674 extern void init_umc8672 (void);
2675 init_umc8672();
2676 goto done;
2677 }
2678 #endif /* CONFIG_BLK_DEV_UMC8672 */
2679 #ifdef CONFIG_BLK_DEV_DTC2278
2680 case -8: /* "dtc2278" */
2681 {
2682 extern void init_dtc2278 (void);
2683 init_dtc2278();
2684 goto done;
2685 }
2686 #endif /* CONFIG_BLK_DEV_DTC2278 */
2687 #ifdef CONFIG_BLK_DEV_CMD640
2688 case -7: /* "cmd640_vlb" */
2689 {
2690 extern int cmd640_vlb; /* flag for cmd640.c */
2691 cmd640_vlb = 1;
2692 goto done;
2693 }
2694 #endif /* CONFIG_BLK_DEV_CMD640 */
2695 #ifdef CONFIG_BLK_DEV_HT6560B
2696 case -6: /* "ht6560b" */
2697 {
2698 extern void init_ht6560b (void);
2699 init_ht6560b();
2700 goto done;
2701 }
2702 #endif /* CONFIG_BLK_DEV_HT6560B */
2703 #if CONFIG_BLK_DEV_QD6580
2704 case -5: /* "qd6580" (no secondary i/f) */
2705 {
2706 extern void init_qd6580 (void);
2707 init_qd6580();
2708 goto done;
2709 }
2710 #endif /* CONFIG_BLK_DEV_QD6580 */
2711 case -4: /* "noautotune" */
2712 hwif->drives[0].autotune = 2;
2713 hwif->drives[1].autotune = 2;
2714 goto done;
2715 case -3: /* "autotune" */
2716 hwif->drives[0].autotune = 1;
2717 hwif->drives[1].autotune = 1;
2718 goto done;
2719 case -2: /* "serialize" */
2720 do_serialize:
2721 if (hw > 1) goto bad_hwif;
2722 ide_hwifs[0].serialized = 1;
2723 goto done;
2724
2725 case -1: /* "noprobe" */
2726 hwif->noprobe = 1;
2727 goto done;
2728
2729 case 1: /* base */
2730 vals[1] = vals[0] + 0x206; /* default ctl */
2731 case 2: /* base,ctl */
2732 vals[2] = 0; /* default irq = probe for it */
2733 case 3: /* base,ctl,irq */
2734 hwif->io_base = vals[0];
2735 hwif->ctl_port = vals[1];
2736 hwif->irq = vals[2];
2737 hwif->noprobe = 0;
2738 hwif->chipset = ide_generic;
2739 goto done;
2740
2741 case 0: goto bad_option;
2742 default:
2743 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2744 return;
2745 }
2746 }
2747 bad_option:
2748 printk(" -- BAD OPTION\n");
2749 return;
2750 bad_hwif:
2751 printk("-- NOT SUPPORTED ON ide%d", hw);
2752 done:
2753 printk("\n");
2754 }
2755
2756 /*
2757 * This routine is called from the partition-table code in genhd.c
2758 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2759 *
2760 * The second parameter, "xparm", determines exactly how the translation
2761 * will be handled:
2762 * 0 = convert to CHS with fewer than 1024 cyls
2763 * using the same method as Ontrack DiskManager.
2764 * 1 = same as "0", plus offset everything by 63 sectors.
2765 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2766 * >1 = convert to a CHS geometry with "xparm" heads.
2767 *
2768 * Returns 0 if the translation was not possible, if the device was not
2769 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2770 * Returns 1 if the geometry translation was successful.
2771 */
2772 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2773 {
2774 ide_drive_t *drive;
2775 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2776 const byte *heads = head_vals;
2777 unsigned long tracks;
2778
2779 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2780 return 0;
2781
2782 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2783 return 0; /* we already have a translation */
2784
2785 printk("%s ", msg);
2786
2787 if (drive->id) {
2788 drive->cyl = drive->id->cyls;
2789 drive->head = drive->id->heads;
2790 drive->sect = drive->id->sectors;
2791 }
2792 drive->bios_cyl = drive->cyl;
2793 drive->bios_head = drive->head;
2794 drive->bios_sect = drive->sect;
2795 drive->special.b.set_geometry = 1;
2796
2797 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2798 drive->bios_sect = 63;
2799 if (xparm > 1) {
2800 drive->bios_head = xparm;
2801 drive->bios_cyl = tracks / drive->bios_head;
2802 } else {
2803 while (drive->bios_cyl >= 1024) {
2804 drive->bios_head = *heads;
2805 drive->bios_cyl = tracks / drive->bios_head;
2806 if (0 == *++heads)
2807 break;
2808 }
2809 #if FAKE_FDISK_FOR_EZDRIVE
2810 if (xparm == -1) {
2811 drive->remap_0_to_1 = 1;
2812 msg = "0->1";
2813 } else
2814 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2815 if (xparm == 1) {
2816 drive->sect0 = 63;
2817 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2818 msg = "+63";
2819 }
2820 printk("[remap %s] ", msg);
2821 }
2822 drive->part[0].nr_sects = current_capacity(drive);
2823 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2824 return 1;
2825 }
2826
2827 /*
2828 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2829 * controller that is BIOS compatible with ST-506, and thus showing up in our
2830 * BIOS table, but not register compatible, and therefore not present in CMOS.
2831 *
2832 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2833 * drives in the system -- the ones reflected as drive 1 or 2. The first
2834 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2835 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2836 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2837 * means we have an AT controller hard disk for that drive.
2838 *
2839 * Of course, there is no guarantee that either drive is actually on the
2840 * "primary" IDE interface, but we don't bother trying to sort that out here.
2841 * If a drive is not actually on the primary interface, then these parameters
2842 * will be ignored. This results in the user having to supply the logical
2843 * drive geometry as a boot parameter for each drive not on the primary i/f.
2844 *
2845 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2846 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2847 * for us during initialization. I have the necessary docs -- any takers? -ml
2848 */
2849
2850 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2851 {
2852 #ifdef __i386__
2853 extern struct drive_info_struct drive_info;
2854 byte cmos_disks, *BIOS = (byte *) &drive_info;
2855 int unit;
2856
2857 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2858 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2859 /* Extract drive geometry from CMOS+BIOS if not already setup */
2860 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2861 ide_drive_t *drive = &hwif->drives[unit];
2862 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2863 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2864 drive->head = drive->bios_head = *(BIOS+2);
2865 drive->sect = drive->bios_sect = *(BIOS+14);
2866 drive->ctl = *(BIOS+8);
2867 drive->present = 1;
2868 }
2869 BIOS += 16;
2870 }
2871 #endif
2872 }
2873
2874 /*
2875 * This routine sets up the irq for an ide interface, and creates a new
2876 * hwgroup for the irq/hwif if none was previously assigned.
2877 *
2878 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2879 * interrupts completely disabled. This can be bad for interrupt latency,
2880 * but anything else has led to problems on some machines. We re-enable
2881 * interrupts as much as we can safely do in most places.
2882 */
2883 static int init_irq (ide_hwif_t *hwif)
/* */
2884 {
2885 unsigned long flags;
2886 int irq = hwif->irq;
2887 ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
2888
2889 save_flags(flags);
2890 cli();
2891
2892 /*
2893 * Grab the irq if we don't already have it from a previous hwif
2894 */
2895 if (hwgroup == NULL) {
2896 if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, NULL)) {
2897 restore_flags(flags);
2898 printk(" -- FAILED!");
2899 return 1;
2900 }
2901 }
2902 /*
2903 * Check for serialization with ide1.
2904 * This code depends on us having already taken care of ide1.
2905 */
2906 if (hwif->serialized && hwif->index == 0 && ide_hwifs[1].present)
2907 hwgroup = ide_hwifs[1].hwgroup;
2908 /*
2909 * If this is the first interface in a group,
2910 * then we need to create the hwgroup structure
2911 */
2912 if (hwgroup == NULL) {
2913 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2914 hwgroup->hwif = hwif->next = hwif;
2915 hwgroup->rq = NULL;
2916 hwgroup->handler = NULL;
2917 hwgroup->drive = &hwif->drives[0];
2918 hwgroup->poll_timeout = 0;
2919 init_timer(&hwgroup->timer);
2920 hwgroup->timer.function = &timer_expiry;
2921 hwgroup->timer.data = (unsigned long) hwgroup;
2922 } else {
2923 hwif->next = hwgroup->hwif->next;
2924 hwgroup->hwif->next = hwif;
2925 }
2926 hwif->hwgroup = hwgroup;
2927 irq_to_hwgroup[irq] = hwgroup;
2928
2929 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2930
2931 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2932 hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
2933 if (hwgroup->hwif != hwif)
2934 printk(" (serialized with %s)", hwgroup->hwif->name);
2935 printk("\n");
2936 return 0;
2937 }
2938
2939 static struct file_operations ide_fops = {
2940 NULL, /* lseek - default */
2941 block_read, /* read - general block-dev read */
2942 block_write, /* write - general block-dev write */
2943 NULL, /* readdir - bad */
2944 NULL, /* select */
2945 ide_ioctl, /* ioctl */
2946 NULL, /* mmap */
2947 ide_open, /* open */
2948 ide_release, /* release */
2949 block_fsync /* fsync */
2950 ,NULL, /* fasync */
2951 ide_check_media_change, /* check_media_change */
2952 revalidate_disk /* revalidate */
2953 };
2954
2955 #ifdef CONFIG_PCI
2956 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
2957
2958 typedef void (ide_pci_init_proc_t)(byte, byte);
2959
2960 /*
2961 * ide_probe_pci() scans PCI for a specific vendor/device function,
2962 * and invokes the supplied init routine for each instance detected.
2963 */
2964 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
2965 {
2966 unsigned long flags;
2967 unsigned index;
2968 byte fn, bus;
2969
2970 save_flags(flags);
2971 cli();
2972 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2973 init (bus, fn + func_adj);
2974 }
2975 restore_flags(flags);
2976 }
2977
2978 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
2979 #endif /* CONFIG_PCI */
2980
2981 /*
2982 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2983 *
2984 * This routine should ideally be using pcibios_find_class() to find
2985 * all IDE interfaces, but that function causes some systems to "go weird".
2986 */
2987 static void probe_for_hwifs (void)
/* */
2988 {
2989 #ifdef CONFIG_PCI
2990 /*
2991 * Find/initialize PCI IDE interfaces
2992 */
2993 if (pcibios_present()) {
2994 #ifdef CONFIG_BLK_DEV_RZ1000
2995 ide_pci_init_proc_t init_rz1000;
2996 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
2997 #endif /* CONFIG_BLK_DEV_RZ1000 */
2998 #ifdef CONFIG_BLK_DEV_TRITON
2999 /*
3000 * Apparently the BIOS32 services on Intel motherboards are
3001 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3002 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3003 * and then add 1.
3004 */
3005 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3006 #endif /* CONFIG_BLK_DEV_TRITON */
3007 }
3008 #endif /* CONFIG_PCI */
3009 #ifdef CONFIG_BLK_DEV_CMD640
3010 {
3011 extern void ide_probe_for_cmd640x (void);
3012 ide_probe_for_cmd640x();
3013 }
3014 #endif
3015 }
3016
3017 static int hwif_init (int h)
/* */
3018 {
3019 ide_hwif_t *hwif = &ide_hwifs[h];
3020 void (*rfn)(void);
3021
3022 if (hwif->noprobe)
3023 return 0;
3024 else {
3025 if (hwif->io_base == HD_DATA)
3026 probe_cmos_for_drives (hwif);
3027 probe_hwif (hwif);
3028 if (!hwif->present)
3029 return 0;
3030 }
3031 if (!hwif->irq) {
3032 if (!(hwif->irq = default_irqs[h])) {
3033 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3034 return (hwif->present = 0);
3035 }
3036 }
3037 #ifdef CONFIG_BLK_DEV_HD
3038 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3039 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3040 return (hwif->present = 0);
3041 }
3042 #endif /* CONFIG_BLK_DEV_HD */
3043
3044 hwif->present = 0; /* we set it back to 1 if all is ok below */
3045 switch (hwif->major) {
3046 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3047 #if MAX_HWIFS > 1
3048 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3049 #endif
3050 #if MAX_HWIFS > 2
3051 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3052 #endif
3053 #if MAX_HWIFS > 3
3054 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3055 #endif
3056 default:
3057 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3058 return (hwif->present = 0);
3059 }
3060 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3061 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3062 } else if (init_irq (hwif)) {
3063 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3064 (void) unregister_blkdev (hwif->major, hwif->name);
3065 } else {
3066 init_gendisk(hwif);
3067 blk_dev[hwif->major].request_fn = rfn;
3068 read_ahead[hwif->major] = 8; /* (4kB) */
3069 hwif->present = 1; /* success */
3070 }
3071 return hwif->present;
3072 }
3073
3074 /*
3075 * This is gets invoked once during initialization, to set *everything* up
3076 */
3077 int ide_init (void)
/* */
3078 {
3079 int h;
3080
3081 init_ide_data ();
3082 /*
3083 * Probe for special "known" interface chipsets
3084 */
3085 probe_for_hwifs ();
3086
3087 /*
3088 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3089 */
3090 for (h = 0; h < MAX_HWIFS; ++h)
3091 hwif_init(h);
3092
3093 #ifdef CONFIG_BLK_DEV_IDETAPE
3094 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3095 #endif /* CONFIG_BLK_DEV_IDETAPE */
3096
3097 return 0;
3098 }
3099
3100 int ide_register(int io_base, int ctl_port, int irq)
/* */
3101 {
3102 int h, i;
3103 ide_hwif_t *hwif;
3104 for (h = 0; h < MAX_HWIFS; ++h) {
3105 hwif = &ide_hwifs[h];
3106 if (hwif->present == 0) break;
3107 }
3108 hwif->io_base = io_base;
3109 hwif->ctl_port = ctl_port;
3110 hwif->irq = irq;
3111 hwif->noprobe = 0;
3112 if (hwif_init(h) != 0) {
3113 hwif->gd->real_devices = hwif->drives[0].name;
3114 for (i = 0; i < hwif->gd->nr_real; i++)
3115 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3116 return h;
3117 }
3118 else
3119 return -1;
3120 }
3121
3122 void ide_unregister(int h)
/* ![[last]](../icons/n_last.png)
*/
3123 {
3124 struct gendisk *prev_gd, *gd;
3125 ide_hwif_t *hwif;
3126
3127 if ((h < 0) || (h >= MAX_HWIFS))
3128 return;
3129 hwif = &ide_hwifs[h];
3130 if (hwif->present) {
3131 hwif->present = 0;
3132 /* This assumes that there is only one group member */
3133 free_irq(hwif->irq, NULL);
3134 kfree(hwif->hwgroup);
3135 irq_to_hwgroup[hwif->irq] = NULL;
3136 unregister_blkdev(hwif->major, hwif->name);
3137 kfree(blksize_size[hwif->major]);
3138 blk_dev[hwif->major].request_fn = NULL;
3139 blksize_size[hwif->major] = NULL;
3140 gd = gendisk_head; prev_gd = NULL;
3141 while (gd && (gd != hwif->gd)) {
3142 prev_gd = gd;
3143 gd = gd->next;
3144 }
3145 if (gd != hwif->gd)
3146 printk("gd not in disk chain!\n");
3147 else {
3148 if (prev_gd != NULL)
3149 prev_gd->next = gd->next;
3150 else
3151 gendisk_head = gd->next;
3152 kfree(gd->sizes);
3153 kfree(gd->part);
3154 kfree(gd);
3155 }
3156 }
3157 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/