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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.37 Apr 6, 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 * removable 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 removable
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 * Version 5.32 change "KB" to "kB"
212 * fix serialize (was broken in kernel 1.3.72)
213 * add support for "hdparm -I"
214 * use common code for disk/tape/cdrom IDE_DRIVE_CMDs
215 * add support for Promise DC4030VL caching card
216 * improved serialize support
217 * put partition check back into alphabetical order
218 * add config option for PCMCIA baggage
219 * try to make PCMCIA support safer to use
220 * improve security on ioctls(): all are suser() only
221 * Version 5.33 improve handling of HDIO_DRIVE_CMDs that read data
222 * Version 5.34 fix irq-sharing problem from 5.33
223 * fix cdrom ioctl problem from 5.33
224 * Version 5.35 cosmetic changes
225 * fix cli() problem in try_to_identify()
226 * Version 5.36 fixes to optional PCMCIA support
227 * Version 5.37 don't use DMA when "noautotune" is specified
228 *
229 * Some additional driver compile-time options are in ide.h
230 *
231 * To do, in likely order of completion:
232 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
233 */
234
235 #undef REALLY_SLOW_IO /* most systems can safely undef this */
236
237 #include <linux/config.h>
238 #include <linux/types.h>
239 #include <linux/string.h>
240 #include <linux/kernel.h>
241 #include <linux/delay.h>
242 #include <linux/timer.h>
243 #include <linux/mm.h>
244 #include <linux/ioport.h>
245 #include <linux/interrupt.h>
246 #include <linux/major.h>
247 #include <linux/blkdev.h>
248 #include <linux/errno.h>
249 #include <linux/hdreg.h>
250 #include <linux/genhd.h>
251 #include <linux/malloc.h>
252
253 #include <asm/byteorder.h>
254 #include <asm/irq.h>
255 #include <asm/segment.h>
256 #include <asm/io.h>
257
258 #ifdef CONFIG_PCI
259 #include <linux/bios32.h>
260 #include <linux/pci.h>
261 #endif /* CONFIG_PCI */
262
263 #include "ide.h"
264 #include "ide_modes.h"
265
266 #ifdef CONFIG_BLK_DEV_PROMISE
267 #include "promise.h"
268 #define IS_PROMISE_DRIVE (HWIF(drive)->chipset == ide_promise)
269 #else
270 #define IS_PROMISE_DRIVE (0) /* auto-NULLs out Promise code */
271 #endif /* CONFIG_BLK_DEV_PROMISE */
272
273 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
274
275 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
276 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
277
278 #if (DISK_RECOVERY_TIME > 0)
279 /*
280 * For really screwy hardware (hey, at least it *can* be used with Linux)
281 * we can enforce a minimum delay time between successive operations.
282 */
283 static unsigned long read_timer(void)
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*/
284 {
285 unsigned long t, flags;
286 int i;
287
288 save_flags(flags);
289 cli();
290 t = jiffies * 11932;
291 outb_p(0, 0x43);
292 i = inb_p(0x40);
293 i |= inb(0x40) << 8;
294 restore_flags(flags);
295 return (t - i);
296 }
297
298 static void set_recovery_timer (ide_hwif_t *hwif)
/* ![[previous]](../icons/left.png)
*/
299 {
300 hwif->last_time = read_timer();
301 }
302 #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
303
304 #else
305
306 #define SET_RECOVERY_TIMER(drive)
307
308 #endif /* DISK_RECOVERY_TIME */
309
310
311 /*
312 * Do not even *think* about calling this!
313 */
314 static void init_hwif_data (unsigned int index)
/* */
315 {
316 byte *p;
317 unsigned int unit;
318 ide_hwif_t *hwif = &ide_hwifs[index];
319
320 /* bulk initialize hwif & drive info with zeros */
321 p = ((byte *) hwif) + sizeof(ide_hwif_t);
322 do {
323 *--p = 0;
324 } while (p > (byte *) hwif);
325
326 /* fill in any non-zero initial values */
327 hwif->index = index;
328 hwif->noprobe = (index > 1);
329 hwif->io_base = default_io_base[index];
330 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
331 #ifdef CONFIG_BLK_DEV_HD
332 if (hwif->io_base == HD_DATA)
333 hwif->noprobe = 1; /* may be overridden by ide_setup() */
334 #endif /* CONFIG_BLK_DEV_HD */
335 hwif->major = ide_hwif_to_major[index];
336 hwif->name[0] = 'i';
337 hwif->name[1] = 'd';
338 hwif->name[2] = 'e';
339 hwif->name[3] = '0' + index;
340 #ifdef CONFIG_BLK_DEV_IDETAPE
341 hwif->tape_drive = NULL;
342 #endif /* CONFIG_BLK_DEV_IDETAPE */
343 for (unit = 0; unit < MAX_DRIVES; ++unit) {
344 ide_drive_t *drive = &hwif->drives[unit];
345
346 drive->select.all = (unit<<4)|0xa0;
347 drive->hwif = hwif;
348 drive->ctl = 0x08;
349 drive->ready_stat = READY_STAT;
350 drive->bad_wstat = BAD_W_STAT;
351 drive->special.b.recalibrate = 1;
352 drive->special.b.set_geometry = 1;
353 drive->name[0] = 'h';
354 drive->name[1] = 'd';
355 drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
356 }
357 }
358
359 /*
360 * init_ide_data() sets reasonable default values into all fields
361 * of all instances of the hwifs and drives, but only on the first call.
362 * Subsequent calls have no effect (they don't wipe out anything).
363 *
364 * This routine is normally called at driver initialization time,
365 * but may also be called MUCH earlier during kernel "command-line"
366 * parameter processing. As such, we cannot depend on any other parts
367 * of the kernel (such as memory allocation) to be functioning yet.
368 *
369 * This is too bad, as otherwise we could dynamically allocate the
370 * ide_drive_t structs as needed, rather than always consuming memory
371 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
372 */
373 #define MAGIC_COOKIE 0x12345678
374 static void init_ide_data (void)
/* */
375 {
376 unsigned int index;
377 static unsigned long magic_cookie = MAGIC_COOKIE;
378
379 if (magic_cookie != MAGIC_COOKIE)
380 return; /* already initialized */
381 magic_cookie = 0;
382
383 for (index = 0; index < MAX_HWIFS; ++index)
384 init_hwif_data(index);
385 }
386
387 #if SUPPORT_VLB_SYNC
388 /*
389 * Some localbus EIDE interfaces require a special access sequence
390 * when using 32-bit I/O instructions to transfer data. We call this
391 * the "vlb_sync" sequence, which consists of three successive reads
392 * of the sector count register location, with interrupts disabled
393 * to ensure that the reads all happen together.
394 */
395 static inline void do_vlb_sync (unsigned short port) {
/* */
396 (void) inb (port);
397 (void) inb (port);
398 (void) inb (port);
399 }
400 #endif /* SUPPORT_VLB_SYNC */
401
402 /*
403 * This is used for most PIO data transfers *from* the IDE interface
404 */
405 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
406 {
407 unsigned short io_base = HWIF(drive)->io_base;
408 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
409 byte io_32bit = drive->io_32bit;
410
411 if (io_32bit) {
412 #if SUPPORT_VLB_SYNC
413 if (io_32bit & 2) {
414 cli();
415 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
416 insl(data_reg, buffer, wcount);
417 if (drive->unmask)
418 sti();
419 } else
420 #endif /* SUPPORT_VLB_SYNC */
421 insl(data_reg, buffer, wcount);
422 } else
423 insw(data_reg, buffer, wcount<<1);
424 }
425
426 /*
427 * This is used for most PIO data transfers *to* the IDE interface
428 */
429 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
430 {
431 unsigned short io_base = HWIF(drive)->io_base;
432 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
433 byte io_32bit = drive->io_32bit;
434
435 if (io_32bit) {
436 #if SUPPORT_VLB_SYNC
437 if (io_32bit & 2) {
438 cli();
439 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
440 outsl(data_reg, buffer, wcount);
441 if (drive->unmask)
442 sti();
443 } else
444 #endif /* SUPPORT_VLB_SYNC */
445 outsl(data_reg, buffer, wcount);
446 } else
447 outsw(data_reg, buffer, wcount<<1);
448 }
449
450 /*
451 * This should get invoked any time we exit the driver to
452 * wait for an interrupt response from a drive. handler() points
453 * at the appropriate code to handle the next interrupt, and a
454 * timer is started to prevent us from waiting forever in case
455 * something goes wrong (see the timer_expiry() handler later on).
456 */
457 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
/* */
458 {
459 ide_hwgroup_t *hwgroup = HWGROUP(drive);
460 #ifdef DEBUG
461 if (hwgroup->handler != NULL) {
462 printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
463 drive->name, hwgroup->handler, handler);
464 }
465 #endif
466 hwgroup->handler = handler;
467 hwgroup->timer.expires = jiffies + timeout;
468 add_timer(&(hwgroup->timer));
469 }
470
471 /*
472 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
473 * value for this drive (from its reported identification information).
474 *
475 * Returns: 1 if lba_capacity looks sensible
476 * 0 otherwise
477 */
478 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
479 {
480 unsigned long lba_sects = id->lba_capacity;
481 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
482 unsigned long _10_percent = chs_sects / 10;
483
484 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
485 if ((lba_sects - chs_sects) < _10_percent)
486 return 1; /* lba_capacity is good */
487
488 /* some drives have the word order reversed */
489 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
490 if ((lba_sects - chs_sects) < _10_percent) {
491 id->lba_capacity = lba_sects; /* fix it */
492 return 1; /* lba_capacity is (now) good */
493 }
494 return 0; /* lba_capacity value is bad */
495 }
496
497 /*
498 * current_capacity() returns the capacity (in sectors) of a drive
499 * according to its current geometry/LBA settings.
500 */
501 static unsigned long current_capacity (ide_drive_t *drive)
/* */
502 {
503 struct hd_driveid *id = drive->id;
504 unsigned long capacity = drive->cyl * drive->head * drive->sect;
505
506 if (!drive->present)
507 return 0;
508 if (drive->media != ide_disk)
509 return 0x7fffffff; /* cdrom or tape */
510 drive->select.b.lba = 0;
511 /* Determine capacity, and use LBA if the drive properly supports it */
512 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
513 if (id->lba_capacity >= capacity) {
514 capacity = id->lba_capacity;
515 drive->select.b.lba = 1;
516 }
517 }
518 return (capacity - drive->sect0);
519 }
520
521 /*
522 * ide_geninit() is called exactly *once* for each major, from genhd.c,
523 * at the beginning of the initial partition check for the drives.
524 */
525 static void ide_geninit (struct gendisk *gd)
/* */
526 {
527 unsigned int unit;
528 ide_hwif_t *hwif = gd->real_devices;
529
530 for (unit = 0; unit < gd->nr_real; ++unit) {
531 ide_drive_t *drive = &hwif->drives[unit];
532 #ifdef CONFIG_BLK_DEV_IDECD
533 if (drive->present && drive->media == ide_cdrom)
534 ide_cdrom_setup(drive);
535 #endif /* CONFIG_BLK_DEV_IDECD */
536 #ifdef CONFIG_BLK_DEV_IDETAPE
537 if (drive->present && drive->media == ide_tape)
538 idetape_setup(drive);
539 #endif /* CONFIG_BLK_DEV_IDETAPE */
540 drive->part[0].nr_sects = current_capacity(drive);
541 if (!drive->present || drive->media != ide_disk) {
542 drive->part[0].start_sect = -1; /* skip partition check */
543 }
544 }
545 }
546
547 /*
548 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
549 * after probing for drives, to allocate partition tables and other data
550 * structures needed for the routines in genhd.c. ide_geninit() gets called
551 * somewhat later, during the partition check.
552 */
553 static void init_gendisk (ide_hwif_t *hwif)
/* */
554 {
555 struct gendisk *gd, **gdp;
556 unsigned int unit, units, minors;
557 int *bs;
558
559 /* figure out maximum drive number on the interface */
560 for (units = MAX_DRIVES; units > 0; --units) {
561 if (hwif->drives[units-1].present)
562 break;
563 }
564 minors = units * (1<<PARTN_BITS);
565 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
566 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
567 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
568 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
569
570 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
571 blksize_size[hwif->major] = bs;
572 for (unit = 0; unit < minors; ++unit)
573 *bs++ = BLOCK_SIZE;
574
575 for (unit = 0; unit < units; ++unit)
576 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
577
578 gd->major = hwif->major; /* our major device number */
579 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
580 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
581 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
582 gd->max_nr = units; /* max num real drives */
583 gd->nr_real = units; /* current num real drives */
584 gd->init = ide_geninit; /* initialization function */
585 gd->real_devices= hwif; /* ptr to internal data */
586 gd->next = NULL; /* linked list of major devs */
587
588 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
589 hwif->gd = *gdp = gd; /* link onto tail of list */
590 }
591
592 static void do_reset1 (ide_drive_t *, int); /* needed below */
593
594 #ifdef CONFIG_BLK_DEV_IDEATAPI
595 /*
596 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
597 * during an atapi drive reset operation. If the drive has not yet responded,
598 * and we have not yet hit our maximum waiting time, then the timer is restarted
599 * for another 50ms.
600 */
601 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
602 {
603 ide_hwgroup_t *hwgroup = HWGROUP(drive);
604 byte stat;
605
606 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
607 udelay (10);
608
609 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
610 printk("%s: ATAPI reset complete\n", drive->name);
611 } else {
612 if (jiffies < hwgroup->poll_timeout) {
613 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
614 return; /* continue polling */
615 }
616 hwgroup->poll_timeout = 0; /* end of polling */
617 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
618 do_reset1 (drive, 1); /* do it the old fashioned way */
619 }
620 hwgroup->poll_timeout = 0; /* done polling */
621 }
622 #endif /* CONFIG_BLK_DEV_IDEATAPI */
623
624 /*
625 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
626 * during an ide reset operation. If the drives have not yet responded,
627 * and we have not yet hit our maximum waiting time, then the timer is restarted
628 * for another 50ms.
629 */
630 static void reset_pollfunc (ide_drive_t *drive)
/* */
631 {
632 ide_hwgroup_t *hwgroup = HWGROUP(drive);
633 ide_hwif_t *hwif = HWIF(drive);
634 byte tmp;
635
636 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
637 if (jiffies < hwgroup->poll_timeout) {
638 ide_set_handler (drive, &reset_pollfunc, HZ/20);
639 return; /* continue polling */
640 }
641 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
642 } else {
643 printk("%s: reset: ", hwif->name);
644 if ((tmp = GET_ERR()) == 1)
645 printk("success\n");
646 else {
647 #if FANCY_STATUS_DUMPS
648 printk("master: ");
649 switch (tmp & 0x7f) {
650 case 1: printk("passed");
651 break;
652 case 2: printk("formatter device error");
653 break;
654 case 3: printk("sector buffer error");
655 break;
656 case 4: printk("ECC circuitry error");
657 break;
658 case 5: printk("controlling MPU error");
659 break;
660 default:printk("error (0x%02x?)", tmp);
661 }
662 if (tmp & 0x80)
663 printk("; slave: failed");
664 printk("\n");
665 #else
666 printk("failed\n");
667 #endif /* FANCY_STATUS_DUMPS */
668 }
669 }
670 hwgroup->poll_timeout = 0; /* done polling */
671 }
672
673 /*
674 * do_reset1() attempts to recover a confused drive by resetting it.
675 * Unfortunately, resetting a disk drive actually resets all devices on
676 * the same interface, so it can really be thought of as resetting the
677 * interface rather than resetting the drive.
678 *
679 * ATAPI devices have their own reset mechanism which allows them to be
680 * individually reset without clobbering other devices on the same interface.
681 *
682 * Unfortunately, the IDE interface does not generate an interrupt to let
683 * us know when the reset operation has finished, so we must poll for this.
684 * Equally poor, though, is the fact that this may a very long time to complete,
685 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
686 * we set a timer to poll at 50ms intervals.
687 */
688 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
689 {
690 unsigned int unit;
691 unsigned long flags;
692 ide_hwif_t *hwif = HWIF(drive);
693 ide_hwgroup_t *hwgroup = HWGROUP(drive);
694
695 save_flags(flags);
696 cli(); /* Why ? */
697
698 #ifdef CONFIG_BLK_DEV_IDEATAPI
699 /* For an ATAPI device, first try an ATAPI SRST. */
700 if (drive->media != ide_disk) {
701 if (!do_not_try_atapi) {
702 if (!drive->keep_settings)
703 drive->unmask = 0;
704 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
705 udelay (20);
706 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
707 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
708 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
709 restore_flags (flags);
710 return;
711 }
712 }
713 #endif /* CONFIG_BLK_DEV_IDEATAPI */
714
715 /*
716 * First, reset any device state data we were maintaining
717 * for any of the drives on this interface.
718 */
719 for (unit = 0; unit < MAX_DRIVES; ++unit) {
720 ide_drive_t *rdrive = &hwif->drives[unit];
721 rdrive->special.all = 0;
722 rdrive->special.b.set_geometry = 1;
723 rdrive->special.b.recalibrate = 1;
724 if (OK_TO_RESET_CONTROLLER)
725 rdrive->mult_count = 0;
726 if (!rdrive->keep_settings) {
727 rdrive->mult_req = 0;
728 rdrive->unmask = 0;
729 if (rdrive->using_dma) {
730 rdrive->using_dma = 0;
731 printk("%s: disabled DMA\n", rdrive->name);
732 }
733 }
734 if (rdrive->mult_req != rdrive->mult_count)
735 rdrive->special.b.set_multmode = 1;
736 }
737
738 #if OK_TO_RESET_CONTROLLER
739 /*
740 * Note that we also set nIEN while resetting the device,
741 * to mask unwanted interrupts from the interface during the reset.
742 * However, due to the design of PC hardware, this will cause an
743 * immediate interrupt due to the edge transition it produces.
744 * This single interrupt gives us a "fast poll" for drives that
745 * recover from reset very quickly, saving us the first 50ms wait time.
746 */
747 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
748 udelay(5); /* more than enough time */
749 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
750 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
751 ide_set_handler (drive, &reset_pollfunc, HZ/20);
752 #endif /* OK_TO_RESET_CONTROLLER */
753
754 restore_flags (flags);
755 }
756
757 /*
758 * ide_do_reset() is the entry point to the drive/interface reset code.
759 */
760 void ide_do_reset (ide_drive_t *drive)
/* */
761 {
762 do_reset1 (drive, 0);
763 #ifdef CONFIG_BLK_DEV_IDETAPE
764 if (drive->media == ide_tape)
765 drive->tape.reset_issued=1;
766 #endif /* CONFIG_BLK_DEV_IDETAPE */
767 }
768
769 /*
770 * Clean up after success/failure of an explicit drive cmd
771 */
772 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
773 {
774 unsigned long flags;
775 struct request *rq = HWGROUP(drive)->rq;
776
777 if (rq->cmd == IDE_DRIVE_CMD) {
778 byte *args = (byte *) rq->buffer;
779 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
780 if (args) {
781 args[0] = stat;
782 args[1] = err;
783 args[2] = IN_BYTE(IDE_NSECTOR_REG);
784 }
785 }
786 save_flags(flags);
787 cli();
788 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
789 HWGROUP(drive)->rq = NULL;
790 rq->rq_status = RQ_INACTIVE;
791 if (rq->sem != NULL)
792 up(rq->sem);
793 restore_flags(flags);
794 }
795
796 /*
797 * Error reporting, in human readable form (luxurious, but a memory hog).
798 */
799 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
800 {
801 unsigned long flags;
802 byte err = 0;
803
804 save_flags (flags);
805 sti();
806 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
807 #if FANCY_STATUS_DUMPS
808 if (drive->media == ide_disk) {
809 printk(" { ");
810 if (stat & BUSY_STAT)
811 printk("Busy ");
812 else {
813 if (stat & READY_STAT) printk("DriveReady ");
814 if (stat & WRERR_STAT) printk("DeviceFault ");
815 if (stat & SEEK_STAT) printk("SeekComplete ");
816 if (stat & DRQ_STAT) printk("DataRequest ");
817 if (stat & ECC_STAT) printk("CorrectedError ");
818 if (stat & INDEX_STAT) printk("Index ");
819 if (stat & ERR_STAT) printk("Error ");
820 }
821 printk("}");
822 }
823 #endif /* FANCY_STATUS_DUMPS */
824 printk("\n");
825 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
826 err = GET_ERR();
827 printk("%s: %s: error=0x%02x", drive->name, msg, err);
828 #if FANCY_STATUS_DUMPS
829 if (drive->media == ide_disk) {
830 printk(" { ");
831 if (err & BBD_ERR) printk("BadSector ");
832 if (err & ECC_ERR) printk("UncorrectableError ");
833 if (err & ID_ERR) printk("SectorIdNotFound ");
834 if (err & ABRT_ERR) printk("DriveStatusError ");
835 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
836 if (err & MARK_ERR) printk("AddrMarkNotFound ");
837 printk("}");
838 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
839 byte cur = IN_BYTE(IDE_SELECT_REG);
840 if (cur & 0x40) { /* using LBA? */
841 printk(", LBAsect=%ld", (unsigned long)
842 ((cur&0xf)<<24)
843 |(IN_BYTE(IDE_HCYL_REG)<<16)
844 |(IN_BYTE(IDE_LCYL_REG)<<8)
845 | IN_BYTE(IDE_SECTOR_REG));
846 } else {
847 printk(", CHS=%d/%d/%d",
848 (IN_BYTE(IDE_HCYL_REG)<<8) +
849 IN_BYTE(IDE_LCYL_REG),
850 cur & 0xf,
851 IN_BYTE(IDE_SECTOR_REG));
852 }
853 if (HWGROUP(drive)->rq)
854 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
855 }
856 }
857 #endif /* FANCY_STATUS_DUMPS */
858 printk("\n");
859 }
860 restore_flags (flags);
861 return err;
862 }
863
864 /*
865 * try_to_flush_leftover_data() is invoked in response to a drive
866 * unexpectedly having its DRQ_STAT bit set. As an alternative to
867 * resetting the drive, this routine tries to clear the condition
868 * by read a sector's worth of data from the drive. Of course,
869 * this may not help if the drive is *waiting* for data from *us*.
870 */
871 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
872 {
873 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
874
875 while (i > 0) {
876 unsigned long buffer[16];
877 unsigned int wcount = (i > 16) ? 16 : i;
878 i -= wcount;
879 ide_input_data (drive, buffer, wcount);
880 }
881 }
882
883 /*
884 * ide_error() takes action based on the error returned by the controller.
885 */
886 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
887 {
888 struct request *rq;
889 byte err;
890
891 err = ide_dump_status(drive, msg, stat);
892 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
893 return;
894 /* retry only "normal" I/O: */
895 if (rq->cmd == IDE_DRIVE_CMD) {
896 rq->errors = 1;
897 ide_end_drive_cmd(drive, stat, err);
898 return;
899 }
900 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
901 rq->errors |= ERROR_RESET;
902 } else {
903 if (drive->media == ide_disk && (stat & ERR_STAT)) {
904 /* err has different meaning on cdrom and tape */
905 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
906 rq->errors = ERROR_MAX;
907 else if (err & TRK0_ERR) /* help it find track zero */
908 rq->errors |= ERROR_RECAL;
909 }
910 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
911 try_to_flush_leftover_data(drive);
912 }
913 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
914 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
915
916 if (rq->errors >= ERROR_MAX) {
917 #ifdef CONFIG_BLK_DEV_IDETAPE
918 if (drive->media == ide_tape) {
919 rq->errors = 0;
920 idetape_end_request(0, HWGROUP(drive));
921 }
922 else
923 #endif /* CONFIG_BLK_DEV_IDETAPE */
924 ide_end_request(0, HWGROUP(drive));
925 }
926 else {
927 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
928 ++rq->errors;
929 ide_do_reset(drive);
930 return;
931 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
932 drive->special.b.recalibrate = 1;
933 ++rq->errors;
934 }
935 }
936
937 /*
938 * read_intr() is the handler for disk read/multread interrupts
939 */
940 static void read_intr (ide_drive_t *drive)
/* */
941 {
942 byte stat;
943 int i;
944 unsigned int msect, nsect;
945 struct request *rq;
946
947 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
948 ide_error(drive, "read_intr", stat);
949 return;
950 }
951 msect = drive->mult_count;
952 read_next:
953 rq = HWGROUP(drive)->rq;
954 if (msect) {
955 if ((nsect = rq->current_nr_sectors) > msect)
956 nsect = msect;
957 msect -= nsect;
958 } else
959 nsect = 1;
960 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
961 #ifdef DEBUG
962 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
963 drive->name, rq->sector, rq->sector+nsect-1,
964 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
965 #endif
966 rq->sector += nsect;
967 rq->buffer += nsect<<9;
968 rq->errors = 0;
969 i = (rq->nr_sectors -= nsect);
970 if ((rq->current_nr_sectors -= nsect) <= 0)
971 ide_end_request(1, HWGROUP(drive));
972 if (i > 0) {
973 if (msect)
974 goto read_next;
975 ide_set_handler (drive, &read_intr, WAIT_CMD);
976 }
977 }
978
979 /*
980 * write_intr() is the handler for disk write interrupts
981 */
982 static void write_intr (ide_drive_t *drive)
/* */
983 {
984 byte stat;
985 int i;
986 ide_hwgroup_t *hwgroup = HWGROUP(drive);
987 struct request *rq = hwgroup->rq;
988
989 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
990 #ifdef DEBUG
991 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
992 drive->name, rq->sector, (unsigned long) rq->buffer,
993 rq->nr_sectors-1);
994 #endif
995 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
996 rq->sector++;
997 rq->buffer += 512;
998 rq->errors = 0;
999 i = --rq->nr_sectors;
1000 --rq->current_nr_sectors;
1001 if (rq->current_nr_sectors <= 0)
1002 ide_end_request(1, hwgroup);
1003 if (i > 0) {
1004 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1005 ide_set_handler (drive, &write_intr, WAIT_CMD);
1006 }
1007 return;
1008 }
1009 }
1010 ide_error(drive, "write_intr", stat);
1011 }
1012
1013 /*
1014 * ide_multwrite() transfers a block of up to mcount sectors of data
1015 * to a drive as part of a disk multiple-sector write operation.
1016 */
1017 void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
/* */
1018 {
1019 struct request *rq = &HWGROUP(drive)->wrq;
1020
1021 do {
1022 unsigned int nsect = rq->current_nr_sectors;
1023 if (nsect > mcount)
1024 nsect = mcount;
1025 mcount -= nsect;
1026
1027 ide_output_data(drive, rq->buffer, nsect<<7);
1028 #ifdef DEBUG
1029 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1030 drive->name, rq->sector, (unsigned long) rq->buffer,
1031 nsect, rq->nr_sectors - nsect);
1032 #endif
1033 if ((rq->nr_sectors -= nsect) <= 0)
1034 break;
1035 if ((rq->current_nr_sectors -= nsect) == 0) {
1036 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1037 rq->current_nr_sectors = rq->bh->b_size>>9;
1038 rq->buffer = rq->bh->b_data;
1039 } else {
1040 panic("%s: buffer list corrupted\n", drive->name);
1041 break;
1042 }
1043 } else {
1044 rq->buffer += nsect << 9;
1045 }
1046 } while (mcount);
1047 }
1048
1049 /*
1050 * multwrite_intr() is the handler for disk multwrite interrupts
1051 */
1052 static void multwrite_intr (ide_drive_t *drive)
/* */
1053 {
1054 byte stat;
1055 int i;
1056 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1057 struct request *rq = &hwgroup->wrq;
1058
1059 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1060 if (stat & DRQ_STAT) {
1061 if (rq->nr_sectors) {
1062 ide_multwrite(drive, drive->mult_count);
1063 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1064 return;
1065 }
1066 } else {
1067 if (!rq->nr_sectors) { /* all done? */
1068 rq = hwgroup->rq;
1069 for (i = rq->nr_sectors; i > 0;){
1070 i -= rq->current_nr_sectors;
1071 ide_end_request(1, hwgroup);
1072 }
1073 return;
1074 }
1075 }
1076 }
1077 ide_error(drive, "multwrite_intr", stat);
1078 }
1079
1080 /*
1081 * Issue a simple drive command
1082 * The drive must be selected beforehand.
1083 */
1084 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1085 {
1086 ide_set_handler (drive, handler, WAIT_CMD);
1087 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1088 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1089 OUT_BYTE(cmd,IDE_COMMAND_REG);
1090 }
1091
1092 /*
1093 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1094 */
1095 static void set_multmode_intr (ide_drive_t *drive)
/* */
1096 {
1097 byte stat = GET_STAT();
1098
1099 sti();
1100 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1101 drive->mult_count = drive->mult_req;
1102 } else {
1103 drive->mult_req = drive->mult_count = 0;
1104 drive->special.b.recalibrate = 1;
1105 (void) ide_dump_status(drive, "set_multmode", stat);
1106 }
1107 }
1108
1109 /*
1110 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1111 */
1112 static void set_geometry_intr (ide_drive_t *drive)
/* */
1113 {
1114 byte stat = GET_STAT();
1115
1116 sti();
1117 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1118 ide_error(drive, "set_geometry_intr", stat);
1119 }
1120
1121 /*
1122 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1123 */
1124 static void recal_intr (ide_drive_t *drive)
/* */
1125 {
1126 byte stat = GET_STAT();
1127
1128 sti();
1129 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1130 ide_error(drive, "recal_intr", stat);
1131 }
1132
1133 /*
1134 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1135 */
1136 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1137 {
1138 struct request *rq = HWGROUP(drive)->rq;
1139 byte *args = (byte *) rq->buffer;
1140 byte stat = GET_STAT();
1141
1142 sti();
1143 if ((stat & DRQ_STAT) && args && args[3]) {
1144 ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1145 stat = GET_STAT();
1146 }
1147 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1148 ide_end_drive_cmd (drive, stat, GET_ERR());
1149 else
1150 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1151 }
1152
1153 /*
1154 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1155 * commands to a drive. It used to do much more, but has been scaled back.
1156 */
1157 static inline void do_special (ide_drive_t *drive)
/* */
1158 {
1159 special_t *s = &drive->special;
1160 next:
1161 #ifdef DEBUG
1162 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1163 #endif
1164 if (s->b.set_geometry) {
1165 s->b.set_geometry = 0;
1166 if (drive->media == ide_disk) {
1167 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1168 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1169 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1170 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1171 if (!IS_PROMISE_DRIVE)
1172 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1173 }
1174 } else if (s->b.recalibrate) {
1175 s->b.recalibrate = 0;
1176 if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1177 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1178 } else if (s->b.set_pio) {
1179 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1180 s->b.set_pio = 0;
1181 if (tuneproc != NULL)
1182 tuneproc(drive, drive->pio_req);
1183 goto next;
1184 } else if (s->b.set_multmode) {
1185 s->b.set_multmode = 0;
1186 if (drive->media == ide_disk) {
1187 if (drive->id && drive->mult_req > drive->id->max_multsect)
1188 drive->mult_req = drive->id->max_multsect;
1189 if (!IS_PROMISE_DRIVE)
1190 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1191 } else
1192 drive->mult_req = 0;
1193 } else if (s->all) {
1194 int special = s->all;
1195 s->all = 0;
1196 printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1197 }
1198 }
1199
1200 /*
1201 * This routine busy-waits for the drive status to be not "busy".
1202 * It then checks the status for all of the "good" bits and none
1203 * of the "bad" bits, and if all is okay it returns 0. All other
1204 * cases return 1 after invoking ide_error() -- caller should just return.
1205 *
1206 * This routine should get fixed to not hog the cpu during extra long waits..
1207 * That could be done by busy-waiting for the first jiffy or two, and then
1208 * setting a timer to wake up at half second intervals thereafter,
1209 * until timeout is achieved, before timing out.
1210 */
1211 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1212 {
1213 byte stat;
1214 unsigned long flags;
1215
1216 test:
1217 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1218 if (OK_STAT((stat = GET_STAT()), good, bad))
1219 return 0; /* fast exit for most frequent case */
1220 if (!(stat & BUSY_STAT)) {
1221 ide_error(drive, "status error", stat);
1222 return 1;
1223 }
1224
1225 save_flags(flags);
1226 sti();
1227 timeout += jiffies;
1228 do {
1229 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1230 restore_flags(flags);
1231 goto test;
1232 }
1233 } while (jiffies <= timeout);
1234
1235 restore_flags(flags);
1236 ide_error(drive, "status timeout", GET_STAT());
1237 return 1;
1238 }
1239
1240 /*
1241 * do_rw_disk() issues READ and WRITE commands to a disk,
1242 * using LBA if supported, or CHS otherwise, to address sectors.
1243 * It also takes care of issuing special DRIVE_CMDs.
1244 */
1245 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1246 {
1247 ide_hwif_t *hwif = HWIF(drive);
1248 unsigned short io_base = hwif->io_base;
1249 #ifdef CONFIG_BLK_DEV_PROMISE
1250 int use_promise_io = 0;
1251 #endif /* CONFIG_BLK_DEV_PROMISE */
1252
1253 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1254 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1255 #ifdef CONFIG_BLK_DEV_PROMISE
1256 if (IS_PROMISE_DRIVE) {
1257 if (hwif->is_promise2 || rq->cmd == READ) {
1258 use_promise_io = 1;
1259 }
1260 }
1261 if (drive->select.b.lba || use_promise_io) {
1262 #else /* !CONFIG_BLK_DEV_PROMISE */
1263 if (drive->select.b.lba) {
1264 #endif /* CONFIG_BLK_DEV_PROMISE */
1265 #ifdef DEBUG
1266 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1267 drive->name, (rq->cmd==READ)?"read":"writ",
1268 block, rq->nr_sectors, (unsigned long) rq->buffer);
1269 #endif
1270 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1271 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1272 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1273 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1274 } else {
1275 unsigned int sect,head,cyl,track;
1276 track = block / drive->sect;
1277 sect = block % drive->sect + 1;
1278 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1279 head = track % drive->head;
1280 cyl = track / drive->head;
1281 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1282 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1283 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1284 #ifdef DEBUG
1285 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1286 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1287 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1288 #endif
1289 }
1290 #ifdef CONFIG_BLK_DEV_PROMISE
1291 if (use_promise_io) {
1292 do_promise_io (drive, rq);
1293 return;
1294 }
1295 #endif /* CONFIG_BLK_DEV_PROMISE */
1296 if (rq->cmd == READ) {
1297 #ifdef CONFIG_BLK_DEV_TRITON
1298 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1299 return;
1300 #endif /* CONFIG_BLK_DEV_TRITON */
1301 ide_set_handler(drive, &read_intr, WAIT_CMD);
1302 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1303 return;
1304 }
1305 if (rq->cmd == WRITE) {
1306 #ifdef CONFIG_BLK_DEV_TRITON
1307 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1308 return;
1309 #endif /* CONFIG_BLK_DEV_TRITON */
1310 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1311 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1312 printk("%s: no DRQ after issuing %s\n", drive->name,
1313 drive->mult_count ? "MULTWRITE" : "WRITE");
1314 return;
1315 }
1316 if (!drive->unmask)
1317 cli();
1318 if (drive->mult_count) {
1319 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1320 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1321 ide_multwrite(drive, drive->mult_count);
1322 } else {
1323 ide_set_handler (drive, &write_intr, WAIT_CMD);
1324 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1325 }
1326 return;
1327 }
1328 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1329 ide_end_request(0, HWGROUP(drive));
1330 }
1331
1332 /*
1333 * execute_drive_cmd() issues a special drive command,
1334 * usually initiated by ioctl() from the external hdparm program.
1335 */
1336 static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
/* */
1337 {
1338 byte *args = rq->buffer;
1339 if (args) {
1340 #ifdef DEBUG
1341 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1342 drive->name, args[0], args[1], args[2], args[3]);
1343 #endif
1344 OUT_BYTE(args[2],IDE_FEATURE_REG);
1345 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1346 return;
1347 } else {
1348 /*
1349 * NULL is actually a valid way of waiting for
1350 * all current requests to be flushed from the queue.
1351 */
1352 #ifdef DEBUG
1353 printk("%s: DRIVE_CMD (null)\n", drive->name);
1354 #endif
1355 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1356 return;
1357 }
1358 }
1359
1360 /*
1361 * do_request() initiates handling of a new I/O request
1362 */
1363 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1364 {
1365 unsigned int minor, unit;
1366 unsigned long block, blockend;
1367 ide_drive_t *drive;
1368
1369 sti();
1370 #ifdef DEBUG
1371 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1372 #endif
1373 minor = MINOR(rq->rq_dev);
1374 unit = minor >> PARTN_BITS;
1375 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1376 printk("%s: bad device number: %s\n",
1377 hwif->name, kdevname(rq->rq_dev));
1378 goto kill_rq;
1379 }
1380 drive = &hwif->drives[unit];
1381 #ifdef DEBUG
1382 if (rq->bh && !buffer_locked(rq->bh)) {
1383 printk("%s: block not locked\n", drive->name);
1384 goto kill_rq;
1385 }
1386 #endif
1387 block = rq->sector;
1388 blockend = block + rq->nr_sectors;
1389 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1390 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1391 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1392 goto kill_rq;
1393 }
1394 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1395 #if FAKE_FDISK_FOR_EZDRIVE
1396 if (block == 0 && drive->remap_0_to_1)
1397 block = 1; /* redirect MBR access to EZ-Drive partn table */
1398 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1399 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1400 #if (DISK_RECOVERY_TIME > 0)
1401 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1402 #endif
1403
1404 #ifdef CONFIG_BLK_DEV_IDETAPE
1405 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1406 #endif /* CONFIG_BLK_DEV_IDETAPE */
1407
1408 SELECT_DRIVE(hwif,drive);
1409 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1410 printk("%s: drive not ready for command\n", drive->name);
1411 return;
1412 }
1413
1414 if (!drive->special.all) {
1415 if (rq->cmd == IDE_DRIVE_CMD) {
1416 execute_drive_cmd(drive, rq);
1417 return;
1418 }
1419 #ifdef CONFIG_BLK_DEV_IDEATAPI
1420 switch (drive->media) {
1421 case ide_disk:
1422 do_rw_disk (drive, rq, block);
1423 return;
1424 #ifdef CONFIG_BLK_DEV_IDECD
1425 case ide_cdrom:
1426 ide_do_rw_cdrom (drive, block);
1427 return;
1428 #endif /* CONFIG_BLK_DEV_IDECD */
1429 #ifdef CONFIG_BLK_DEV_IDETAPE
1430 case ide_tape:
1431 idetape_do_request (drive, rq, block);
1432 return;
1433 #endif /* CONFIG_BLK_DEV_IDETAPE */
1434
1435 default:
1436 printk("%s: media type %d not supported\n",
1437 drive->name, drive->media);
1438 goto kill_rq;
1439 }
1440 #else
1441 do_rw_disk (drive, rq, block); /* simpler and faster */
1442 return;
1443 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1444 }
1445 do_special(drive);
1446 return;
1447 kill_rq:
1448 ide_end_request(0, hwif->hwgroup);
1449 }
1450
1451 /*
1452 * The driver enables interrupts as much as possible. In order to do this,
1453 * (a) the device-interrupt is always masked before entry, and
1454 * (b) the timeout-interrupt is always disabled before entry.
1455 *
1456 * If we enter here from, say irq14, and then start a new request for irq15,
1457 * (possible with "serialize" option) then we cannot ensure that we exit
1458 * before the irq15 hits us. So, we must be careful not to let this bother us.
1459 *
1460 * Interrupts are still masked (by default) whenever we are exchanging
1461 * data/cmds with a drive, because some drives seem to have very poor
1462 * tolerance for latency during I/O. For devices which don't suffer from
1463 * this problem (most don't), the unmask flag can be set using the "hdparm"
1464 * utility, to permit other interrupts during data/cmd transfers.
1465 */
1466 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1467 {
1468 cli(); /* paranoia */
1469 if (hwgroup->handler != NULL) {
1470 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1471 return;
1472 }
1473 do {
1474 ide_hwif_t *hwif = hwgroup->hwif;
1475 struct request *rq;
1476 if ((rq = hwgroup->rq) == NULL) {
1477 /*
1478 * hwgroup->next_hwif is different from hwgroup->hwif
1479 * only when a request is inserted using "ide_next".
1480 * This saves wear and tear on IDE tapes.
1481 */
1482 hwif = hwgroup->next_hwif;
1483 do {
1484 rq = blk_dev[hwif->major].current_request;
1485 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1486 goto got_rq;
1487 } while ((hwif = hwif->next) != hwgroup->next_hwif);
1488 return; /* no work left for this hwgroup */
1489 }
1490 got_rq:
1491 do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1492 cli();
1493 } while (hwgroup->handler == NULL);
1494 }
1495
1496 /*
1497 * do_hwgroup_request() invokes ide_do_request() after first masking
1498 * all possible interrupts for the current hwgroup. This prevents race
1499 * conditions in the event that an unexpected interrupt occurs while
1500 * we are in the driver.
1501 *
1502 * Note that when an interrupt is used to reenter the driver, the first level
1503 * handler will already have masked the irq that triggered, but any other ones
1504 * for the hwgroup will still be unmasked. The driver tries to be careful
1505 * about such things.
1506 */
1507 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1508 {
1509 if (hwgroup->handler == NULL) {
1510 ide_hwif_t *hgif = hwgroup->hwif;
1511 ide_hwif_t *hwif = hgif;
1512 do {
1513 disable_irq(hwif->irq);
1514 } while ((hwif = hwif->next) != hgif);
1515 ide_do_request (hwgroup);
1516 do {
1517 enable_irq(hwif->irq);
1518 } while ((hwif = hwif->next) != hgif);
1519 }
1520 }
1521
1522 static void do_ide0_request (void) /* invoked with cli() */
/* */
1523 {
1524 do_hwgroup_request (ide_hwifs[0].hwgroup);
1525 }
1526
1527 #if MAX_HWIFS > 1
1528 static void do_ide1_request (void) /* invoked with cli() */
/* */
1529 {
1530 do_hwgroup_request (ide_hwifs[1].hwgroup);
1531 }
1532 #endif
1533
1534 #if MAX_HWIFS > 2
1535 static void do_ide2_request (void) /* invoked with cli() */
/* */
1536 {
1537 do_hwgroup_request (ide_hwifs[2].hwgroup);
1538 }
1539 #endif
1540
1541 #if MAX_HWIFS > 3
1542 static void do_ide3_request (void) /* invoked with cli() */
/* */
1543 {
1544 do_hwgroup_request (ide_hwifs[3].hwgroup);
1545 }
1546 #endif
1547
1548 static void timer_expiry (unsigned long data)
/* */
1549 {
1550 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1551 ide_drive_t *drive = hwgroup->drive;
1552 unsigned long flags;
1553
1554 save_flags(flags);
1555 cli();
1556
1557 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1558 ide_handler_t *handler = hwgroup->handler;
1559 hwgroup->handler = NULL;
1560 handler(drive);
1561 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1562 sti(); /* drive must have responded just as the timer expired */
1563 printk("%s: marginal timeout\n", drive->name);
1564 } else {
1565 hwgroup->handler = NULL; /* abort the operation */
1566 if (hwgroup->hwif->dmaproc)
1567 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1568 ide_error(drive, "irq timeout", GET_STAT());
1569 }
1570 if (hwgroup->handler == NULL)
1571 do_hwgroup_request (hwgroup);
1572 restore_flags(flags);
1573 }
1574
1575 /*
1576 * There's nothing really useful we can do with an unexpected interrupt,
1577 * other than reading the status register (to clear it), and logging it.
1578 * There should be no way that an irq can happen before we're ready for it,
1579 * so we needn't worry much about losing an "important" interrupt here.
1580 *
1581 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1582 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1583 * "good", we just ignore the interrupt completely.
1584 *
1585 * This routine assumes cli() is in effect when called.
1586 *
1587 * If an unexpected interrupt happens on irq15 while we are handling irq14
1588 * and if the two interfaces are "serialized" (CMD640), then it looks like
1589 * we could screw up by interfering with a new request being set up for irq15.
1590 *
1591 * In reality, this is a non-issue. The new command is not sent unless the
1592 * drive is ready to accept one, in which case we know the drive is not
1593 * trying to interrupt us. And ide_set_handler() is always invoked before
1594 * completing the issuance of any new drive command, so we will not be
1595 * accidently invoked as a result of any valid command completion interrupt.
1596 *
1597 */
1598 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1599 {
1600 byte stat;
1601 unsigned int unit;
1602 ide_hwif_t *hwif = hwgroup->hwif;
1603
1604 /*
1605 * handle the unexpected interrupt
1606 */
1607 do {
1608 if (hwif->irq == irq) {
1609 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1610 ide_drive_t *drive = &hwif->drives[unit];
1611 if (!drive->present)
1612 continue;
1613 SELECT_DRIVE(hwif,drive);
1614 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1615 (void) ide_dump_status(drive, "unexpected_intr", stat);
1616 if ((stat & DRQ_STAT))
1617 try_to_flush_leftover_data(drive);
1618 }
1619 }
1620 } while ((hwif = hwif->next) != hwgroup->hwif);
1621 SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1622 }
1623
1624 /*
1625 * entry point for all interrupts, caller does cli() for us
1626 */
1627 void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1628 {
1629 ide_hwgroup_t *hwgroup = dev_id;
1630 ide_handler_t *handler;
1631
1632 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1633 ide_drive_t *drive = hwgroup->drive;
1634 hwgroup->handler = NULL;
1635 del_timer(&(hwgroup->timer));
1636 if (drive->unmask)
1637 sti();
1638 handler(drive);
1639 cli(); /* this is necessary, as next rq may be different irq */
1640 if (hwgroup->handler == NULL) {
1641 SET_RECOVERY_TIMER(HWIF(drive));
1642 ide_do_request(hwgroup);
1643 }
1644 } else {
1645 unexpected_intr(irq, hwgroup);
1646 }
1647 cli();
1648 }
1649
1650 /*
1651 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1652 * It returns NULL if the given device number does not match any present drives.
1653 */
1654 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1655 {
1656 int major = MAJOR(i_rdev);
1657 unsigned int h;
1658
1659 for (h = 0; h < MAX_HWIFS; ++h) {
1660 ide_hwif_t *hwif = &ide_hwifs[h];
1661 if (hwif->present && major == hwif->major) {
1662 unsigned unit = DEVICE_NR(i_rdev);
1663 if (unit < MAX_DRIVES) {
1664 ide_drive_t *drive = &hwif->drives[unit];
1665 if (drive->present)
1666 return drive;
1667 } else if (major == IDE0_MAJOR && unit < 4) {
1668 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1669 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1670 }
1671 break;
1672 }
1673 }
1674 return NULL;
1675 }
1676
1677 /*
1678 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1679 */
1680 void ide_init_drive_cmd (struct request *rq)
/* */
1681 {
1682 rq->buffer = NULL;
1683 rq->cmd = IDE_DRIVE_CMD;
1684 rq->sector = 0;
1685 rq->nr_sectors = 0;
1686 rq->current_nr_sectors = 0;
1687 rq->sem = NULL;
1688 rq->bh = NULL;
1689 rq->bhtail = NULL;
1690 rq->next = NULL;
1691
1692 #if 0 /* these are done each time through ide_do_drive_cmd() */
1693 rq->errors = 0;
1694 rq->rq_status = RQ_ACTIVE;
1695 rq->rq_dev = ????;
1696 #endif
1697 }
1698
1699 /*
1700 * This function issues a special IDE device request
1701 * onto the request queue.
1702 *
1703 * If action is ide_wait, then then rq is queued at the end of
1704 * the request queue, and the function sleeps until it has been
1705 * processed. This is for use when invoked from an ioctl handler.
1706 *
1707 * If action is ide_preempt, then the rq is queued at the head of
1708 * the request queue, displacing the currently-being-processed
1709 * request and this function returns immediately without waiting
1710 * for the new rq to be completed. This is VERY DANGEROUS, and is
1711 * intended for careful use by the ATAPI tape/cdrom driver code.
1712 *
1713 * If action is ide_next, then the rq is queued immediately after
1714 * the currently-being-processed-request (if any), and the function
1715 * returns without waiting for the new rq to be completed. As above,
1716 * This is VERY DANGEROUS, and is intended for careful use by the
1717 * ATAPI tape/cdrom driver code.
1718 *
1719 * If action is ide_end, then the rq is queued at the end of the
1720 * request queue, and the function returns immediately without waiting
1721 * for the new rq to be completed. This is again intended for careful
1722 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1723 * when operating in the pipelined operation mode).
1724 */
1725 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1726 {
1727 unsigned long flags;
1728 unsigned int major = HWIF(drive)->major;
1729 struct request *cur_rq;
1730 struct blk_dev_struct *bdev = &blk_dev[major];
1731 struct semaphore sem = MUTEX_LOCKED;
1732
1733 if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1734 return -ENOSYS; /* special drive cmds not supported */
1735 rq->errors = 0;
1736 rq->rq_status = RQ_ACTIVE;
1737 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1738 if (action == ide_wait)
1739 rq->sem = &sem;
1740
1741 save_flags(flags);
1742 cli();
1743 if (action == ide_next)
1744 HWGROUP(drive)->next_hwif = HWIF(drive);
1745 cur_rq = bdev->current_request;
1746
1747 if (cur_rq == NULL || action == ide_preempt) {
1748 rq->next = cur_rq;
1749 bdev->current_request = rq;
1750 if (action == ide_preempt) {
1751 HWGROUP(drive)->rq = NULL;
1752 } else
1753 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1754 bdev->request_fn();
1755 cli();
1756 }
1757 } else {
1758 if (action == ide_wait || action == ide_end) {
1759 while (cur_rq->next != NULL) /* find end of list */
1760 cur_rq = cur_rq->next;
1761 }
1762 rq->next = cur_rq->next;
1763 cur_rq->next = rq;
1764 }
1765 if (action == ide_wait && rq->rq_status != RQ_INACTIVE) {
1766 run_task_queue(&tq_disk);
1767 down(&sem); /* wait for it to be serviced */
1768 }
1769 restore_flags(flags);
1770 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1771 }
1772
1773 static int ide_open(struct inode * inode, struct file * filp)
/* */
1774 {
1775 ide_drive_t *drive;
1776 unsigned long flags;
1777
1778 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1779 return -ENODEV;
1780 save_flags(flags);
1781 cli();
1782 while (drive->busy)
1783 sleep_on(&drive->wqueue);
1784 drive->usage++;
1785 restore_flags(flags);
1786 #ifdef CONFIG_BLK_DEV_IDECD
1787 if (drive->media == ide_cdrom)
1788 return ide_cdrom_open (inode, filp, drive);
1789 #endif /* CONFIG_BLK_DEV_IDECD */
1790 #ifdef CONFIG_BLK_DEV_IDETAPE
1791 if (drive->media == ide_tape)
1792 return idetape_blkdev_open (inode, filp, drive);
1793 #endif /* CONFIG_BLK_DEV_IDETAPE */
1794 if (drive->removable) {
1795 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1796 struct request rq;
1797 check_disk_change(inode->i_rdev);
1798 ide_init_drive_cmd (&rq);
1799 rq.buffer = door_lock;
1800 /*
1801 * Ignore the return code from door_lock,
1802 * since the open() has already succeeded,
1803 * and the door_lock is irrelevant at this point.
1804 */
1805 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1806 }
1807 return 0;
1808 }
1809
1810 /*
1811 * Releasing a block device means we sync() it, so that it can safely
1812 * be forgotten about...
1813 */
1814 static void ide_release(struct inode * inode, struct file * file)
/* */
1815 {
1816 ide_drive_t *drive;
1817
1818 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1819 fsync_dev(inode->i_rdev);
1820 drive->usage--;
1821 #ifdef CONFIG_BLK_DEV_IDECD
1822 if (drive->media == ide_cdrom) {
1823 ide_cdrom_release (inode, file, drive);
1824 return;
1825 }
1826 #endif /* CONFIG_BLK_DEV_IDECD */
1827 #ifdef CONFIG_BLK_DEV_IDETAPE
1828 if (drive->media == ide_tape) {
1829 idetape_blkdev_release (inode, file, drive);
1830 return;
1831 }
1832 #endif /* CONFIG_BLK_DEV_IDETAPE */
1833 if (drive->removable && !drive->usage) {
1834 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1835 struct request rq;
1836 invalidate_buffers(inode->i_rdev);
1837 ide_init_drive_cmd (&rq);
1838 rq.buffer = door_unlock;
1839 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1840 }
1841 }
1842 }
1843
1844 /*
1845 * This routine is called to flush all partitions and partition tables
1846 * for a changed disk, and then re-read the new partition table.
1847 * If we are revalidating a disk because of a media change, then we
1848 * enter with usage == 0. If we are using an ioctl, we automatically have
1849 * usage == 1 (we need an open channel to use an ioctl :-), so this
1850 * is our limit.
1851 */
1852 static int revalidate_disk(kdev_t i_rdev)
/* */
1853 {
1854 ide_drive_t *drive;
1855 unsigned int p, major, minor;
1856 long flags;
1857
1858 if ((drive = get_info_ptr(i_rdev)) == NULL)
1859 return -ENODEV;
1860
1861 major = MAJOR(i_rdev);
1862 minor = drive->select.b.unit << PARTN_BITS;
1863 save_flags(flags);
1864 cli();
1865 if (drive->busy || (drive->usage > 1)) {
1866 restore_flags(flags);
1867 return -EBUSY;
1868 };
1869 drive->busy = 1;
1870 restore_flags(flags);
1871
1872 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1873 if (drive->part[p].nr_sects > 0) {
1874 kdev_t devp = MKDEV(major, minor+p);
1875 sync_dev (devp);
1876 invalidate_inodes (devp);
1877 invalidate_buffers (devp);
1878 }
1879 drive->part[p].start_sect = 0;
1880 drive->part[p].nr_sects = 0;
1881 };
1882
1883 drive->part[0].nr_sects = current_capacity(drive);
1884 if (drive->media == ide_disk)
1885 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1886
1887 drive->busy = 0;
1888 wake_up(&drive->wqueue);
1889 return 0;
1890 }
1891
1892 static int write_fs_long (unsigned long useraddr, long value)
/* */
1893 {
1894 int err;
1895
1896 if (NULL == (long *)useraddr)
1897 return -EINVAL;
1898 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1899 return err;
1900 put_user((unsigned)value, (long *) useraddr);
1901 return 0;
1902 }
1903
1904 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1905 unsigned int cmd, unsigned long arg)
1906 {
1907 int err;
1908 ide_drive_t *drive;
1909 unsigned long flags;
1910 struct request rq;
1911
1912 if (!inode || !(inode->i_rdev))
1913 return -EINVAL;
1914 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1915 return -ENODEV;
1916 ide_init_drive_cmd (&rq);
1917 switch (cmd) {
1918 case HDIO_GETGEO:
1919 {
1920 struct hd_geometry *loc = (struct hd_geometry *) arg;
1921 if (!loc || drive->media != ide_disk) return -EINVAL;
1922 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1923 if (err) return err;
1924 put_user(drive->bios_head, (byte *) &loc->heads);
1925 put_user(drive->bios_sect, (byte *) &loc->sectors);
1926 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1927 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1928 (unsigned long *) &loc->start);
1929 return 0;
1930 }
1931 case BLKFLSBUF:
1932 if (!suser()) return -EACCES;
1933 fsync_dev(inode->i_rdev);
1934 invalidate_buffers(inode->i_rdev);
1935 return 0;
1936
1937 case BLKRASET:
1938 if (!suser()) return -EACCES;
1939 if(arg > 0xff) return -EINVAL;
1940 read_ahead[MAJOR(inode->i_rdev)] = arg;
1941 return 0;
1942
1943 case BLKRAGET:
1944 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1945
1946 case BLKGETSIZE: /* Return device size */
1947 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1948 case BLKRRPART: /* Re-read partition tables */
1949 if (!suser()) return -EACCES;
1950 return revalidate_disk(inode->i_rdev);
1951
1952 case HDIO_GET_KEEPSETTINGS:
1953 return write_fs_long(arg, drive->keep_settings);
1954
1955 case HDIO_GET_UNMASKINTR:
1956 return write_fs_long(arg, drive->unmask);
1957
1958 case HDIO_GET_DMA:
1959 return write_fs_long(arg, drive->using_dma);
1960
1961 case HDIO_GET_32BIT:
1962 return write_fs_long(arg, drive->io_32bit);
1963
1964 case HDIO_GET_MULTCOUNT:
1965 return write_fs_long(arg, drive->mult_count);
1966
1967 case HDIO_GET_IDENTITY:
1968 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1969 return -EINVAL;
1970 if (drive->id == NULL)
1971 return -ENOMSG;
1972 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1973 if (!err)
1974 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1975 return err;
1976
1977 case HDIO_GET_NOWERR:
1978 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1979
1980 case HDIO_SET_DMA:
1981 if (!suser()) return -EACCES;
1982 #ifdef CONFIG_BLK_DEV_IDECD
1983 if (drive->media == ide_cdrom)
1984 return -EPERM;
1985 #endif /* CONFIG_BLK_DEV_IDECD */
1986 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1987 return -EPERM;
1988 case HDIO_SET_KEEPSETTINGS:
1989 case HDIO_SET_UNMASKINTR:
1990 case HDIO_SET_NOWERR:
1991 if (arg > 1)
1992 return -EINVAL;
1993 case HDIO_SET_32BIT:
1994 if (!suser()) return -EACCES;
1995 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1996 return -EINVAL;
1997 save_flags(flags);
1998 cli();
1999 switch (cmd) {
2000 case HDIO_SET_DMA:
2001 if (!(HWIF(drive)->dmaproc)) {
2002 restore_flags(flags);
2003 return -EPERM;
2004 }
2005 drive->using_dma = arg;
2006 break;
2007 case HDIO_SET_KEEPSETTINGS:
2008 drive->keep_settings = arg;
2009 break;
2010 case HDIO_SET_UNMASKINTR:
2011 if (arg && HWIF(drive)->no_unmask) {
2012 restore_flags(flags);
2013 return -EPERM;
2014 }
2015 drive->unmask = arg;
2016 break;
2017 case HDIO_SET_NOWERR:
2018 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2019 break;
2020 case HDIO_SET_32BIT:
2021 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
2022 return -EINVAL;
2023 drive->io_32bit = arg;
2024 #ifdef CONFIG_BLK_DEV_DTC2278
2025 if (HWIF(drive)->chipset == ide_dtc2278)
2026 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2027 #endif /* CONFIG_BLK_DEV_DTC2278 */
2028 break;
2029 }
2030 restore_flags(flags);
2031 return 0;
2032
2033 case HDIO_SET_MULTCOUNT:
2034 if (!suser()) return -EACCES;
2035 if (MINOR(inode->i_rdev) & PARTN_MASK)
2036 return -EINVAL;
2037 if (drive->id && arg > drive->id->max_multsect)
2038 return -EINVAL;
2039 save_flags(flags);
2040 cli();
2041 if (drive->special.b.set_multmode) {
2042 restore_flags(flags);
2043 return -EBUSY;
2044 }
2045 drive->mult_req = arg;
2046 drive->special.b.set_multmode = 1;
2047 restore_flags(flags);
2048 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2049 return (drive->mult_count == arg) ? 0 : -EIO;
2050
2051 case HDIO_DRIVE_CMD:
2052 {
2053 byte args[4], *argbuf = args;
2054 int argsize = 4;
2055 if (!suser()) return -EACCES;
2056 if (NULL == (void *) arg) {
2057 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2058 } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2059 memcpy_fromfs(args, (void *)arg, 4);
2060 if (args[3]) {
2061 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2062 argbuf = kmalloc(argsize, GFP_KERNEL);
2063 if (argbuf == NULL)
2064 return -ENOMEM;
2065 argbuf[0] = args[0];
2066 argbuf[1] = args[1];
2067 argbuf[2] = args[2];
2068 argbuf[3] = args[3];
2069 }
2070 if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2071 rq.buffer = argbuf;
2072 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2073 memcpy_tofs((void *)arg, argbuf, argsize);
2074 }
2075 if (argsize > 4)
2076 kfree(argbuf);
2077 }
2078 return err;
2079 }
2080 case HDIO_SET_PIO_MODE:
2081 if (!suser()) return -EACCES;
2082 if (MINOR(inode->i_rdev) & PARTN_MASK)
2083 return -EINVAL;
2084 if (!HWIF(drive)->tuneproc)
2085 return -ENOSYS;
2086 save_flags(flags);
2087 cli();
2088 drive->pio_req = (int) arg;
2089 drive->special.b.set_pio = 1;
2090 restore_flags(flags);
2091 return 0;
2092
2093 RO_IOCTLS(inode->i_rdev, arg);
2094
2095 default:
2096 #ifdef CONFIG_BLK_DEV_IDECD
2097 if (drive->media == ide_cdrom)
2098 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2099 #endif /* CONFIG_BLK_DEV_IDECD */
2100 #ifdef CONFIG_BLK_DEV_IDETAPE
2101 if (drive->media == ide_tape)
2102 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2103 #endif /* CONFIG_BLK_DEV_IDETAPE */
2104 return -EPERM;
2105 }
2106 }
2107
2108 static int ide_check_media_change (kdev_t i_rdev)
/* */
2109 {
2110 ide_drive_t *drive;
2111
2112 if ((drive = get_info_ptr(i_rdev)) == NULL)
2113 return -ENODEV;
2114 #ifdef CONFIG_BLK_DEV_IDECD
2115 if (drive->media == ide_cdrom)
2116 return ide_cdrom_check_media_change (drive);
2117 #endif /* CONFIG_BLK_DEV_IDECD */
2118 if (drive->removable) /* for disks */
2119 return 1; /* always assume it was changed */
2120 return 0;
2121 }
2122
2123 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2124 {
2125 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2126
2127 if (byteswap) {
2128 /* convert from big-endian to host byte order */
2129 for (p = end ; p != s;) {
2130 unsigned short *pp = (unsigned short *) (p -= 2);
2131 *pp = ntohs(*pp);
2132 }
2133 }
2134
2135 /* strip leading blanks */
2136 while (s != end && *s == ' ')
2137 ++s;
2138
2139 /* compress internal blanks and strip trailing blanks */
2140 while (s != end && *s) {
2141 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2142 *p++ = *(s-1);
2143 }
2144
2145 /* wipe out trailing garbage */
2146 while (p != end)
2147 *p++ = '\0';
2148 }
2149
2150 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2151 {
2152 int bswap;
2153 struct hd_driveid *id;
2154 unsigned long capacity, check;
2155
2156 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2157 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2158 sti();
2159
2160 /*
2161 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2162 */
2163 if ((id->model[0] == 'P' && id->model[1] == 'M')
2164 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2165 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2166 drive->present = 0;
2167 return;
2168 }
2169
2170 /*
2171 * WIN_IDENTIFY returns little-endian info,
2172 * WIN_PIDENTIFY *usually* returns little-endian info.
2173 */
2174 bswap = 1;
2175 if (cmd == WIN_PIDENTIFY) {
2176 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2177 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2178 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2179 bswap = 0; /* Vertos drives may still be weird */
2180 }
2181 ide_fixstring (id->model, sizeof(id->model), bswap);
2182 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2183 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2184
2185 #ifdef CONFIG_BLK_DEV_IDEATAPI
2186 /*
2187 * Check for an ATAPI device
2188 */
2189 if (cmd == WIN_PIDENTIFY) {
2190 byte type = (id->config >> 8) & 0x1f;
2191 printk("%s: %s, ATAPI ", drive->name, id->model);
2192 #ifdef CONFIG_BLK_DEV_PROMISE
2193 if (HWIF(drive)->is_promise2) {
2194 printk(" -- not supported on 2nd Promise port\n");
2195 drive->present = 0;
2196 return;
2197 }
2198 #endif /* CONFIG_BLK_DEV_PROMISE */
2199 switch (type) {
2200 case 0: /* Early cdrom models used zero */
2201 case 5:
2202 #ifdef CONFIG_BLK_DEV_IDECD
2203 printk ("CDROM drive\n");
2204 drive->media = ide_cdrom;
2205 drive->present = 1;
2206 drive->removable = 1;
2207 return;
2208 #else
2209 printk ("CDROM ");
2210 break;
2211 #endif /* CONFIG_BLK_DEV_IDECD */
2212 case 1:
2213 #ifdef CONFIG_BLK_DEV_IDETAPE
2214 printk ("TAPE drive");
2215 if (idetape_identify_device (drive,id)) {
2216 drive->media = ide_tape;
2217 drive->present = 1;
2218 drive->removable = 1;
2219 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2220 if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
2221 printk(", DMA");
2222 }
2223 printk("\n");
2224 }
2225 else {
2226 drive->present = 0;
2227 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2228 }
2229 return;
2230 #else
2231 printk ("TAPE ");
2232 break;
2233 #endif /* CONFIG_BLK_DEV_IDETAPE */
2234 default:
2235 drive->present = 0;
2236 printk("Type %d - Unknown device\n", type);
2237 return;
2238 }
2239 drive->present = 0;
2240 printk("- not supported by this kernel\n");
2241 return;
2242 }
2243 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2244
2245 /* check for removable disks (eg. SYQUEST), ignore 'WD' drives */
2246 if (id->config & (1<<7)) { /* removable disk ? */
2247 if (id->model[0] != 'W' || id->model[1] != 'D')
2248 drive->removable = 1;
2249 }
2250
2251 /* SunDisk drives: treat as non-removable, force one unit */
2252 if (id->model[0] == 'S' && id->model[1] == 'u') {
2253 drive->removable = 0;
2254 if (drive->select.all & (1<<4)) {
2255 drive->present = 0;
2256 return;
2257 }
2258 }
2259
2260 drive->media = ide_disk;
2261 /* Extract geometry if we did not already have one for the drive */
2262 if (!drive->present) {
2263 drive->present = 1;
2264 drive->cyl = drive->bios_cyl = id->cyls;
2265 drive->head = drive->bios_head = id->heads;
2266 drive->sect = drive->bios_sect = id->sectors;
2267 }
2268 /* Handle logical geometry translation by the drive */
2269 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2270 && (id->cur_heads <= 16) && id->cur_sectors)
2271 {
2272 /*
2273 * Extract the physical drive geometry for our use.
2274 * Note that we purposely do *not* update the bios info.
2275 * This way, programs that use it (like fdisk) will
2276 * still have the same logical view as the BIOS does,
2277 * which keeps the partition table from being screwed.
2278 *
2279 * An exception to this is the cylinder count,
2280 * which we reexamine later on to correct for 1024 limitations.
2281 */
2282 drive->cyl = id->cur_cyls;
2283 drive->head = id->cur_heads;
2284 drive->sect = id->cur_sectors;
2285
2286 /* check for word-swapped "capacity" field in id information */
2287 capacity = drive->cyl * drive->head * drive->sect;
2288 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2289 if (check == capacity) { /* was it swapped? */
2290 /* yes, bring it into little-endian order: */
2291 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2292 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2293 }
2294 }
2295 /* Use physical geometry if what we have still makes no sense */
2296 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2297 drive->cyl = id->cyls;
2298 drive->head = id->heads;
2299 drive->sect = id->sectors;
2300 }
2301 /* Correct the number of cyls if the bios value is too small */
2302 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2303 if (drive->cyl > drive->bios_cyl)
2304 drive->bios_cyl = drive->cyl;
2305 }
2306
2307 (void) current_capacity (drive); /* initialize LBA selection */
2308
2309 printk ("%s: %.40s, %ldMB w/%dkB Cache, %sCHS=%d/%d/%d",
2310 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2311 drive->select.b.lba ? "LBA, " : "",
2312 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2313
2314 drive->mult_count = 0;
2315 if (id->max_multsect) {
2316 drive->mult_req = INITIAL_MULT_COUNT;
2317 if (drive->mult_req > id->max_multsect)
2318 drive->mult_req = id->max_multsect;
2319 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2320 drive->special.b.set_multmode = 1;
2321 }
2322 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2323 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2324 printk(", DMA");
2325 }
2326 printk("\n");
2327 }
2328
2329 /*
2330 * Delay for *at least* 10ms. As we don't know how much time is left
2331 * until the next tick occurs, we wait an extra tick to be safe.
2332 * This is used only during the probing/polling for drives at boot time.
2333 */
2334 static void delay_10ms (void)
/* */
2335 {
2336 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2337 while (timer > jiffies);
2338 }
2339
2340 /*
2341 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2342 * and waits for a response. It also monitors irqs while this is
2343 * happening, in hope of automatically determining which one is
2344 * being used by the interface.
2345 *
2346 * Returns: 0 device was identified
2347 * 1 device timed-out (no response to identify request)
2348 * 2 device aborted the command (refused to identify itself)
2349 */
2350 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2351 {
2352 int hd_status, rc;
2353 unsigned long timeout;
2354 int irqs = 0;
2355
2356 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2357 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2358 irqs = probe_irq_on(); /* start monitoring irqs */
2359 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2360 }
2361
2362 delay_10ms(); /* take a deep breath */
2363 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2364 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2365 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2366 } else
2367 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2368
2369 #if CONFIG_BLK_DEV_PROMISE
2370 if (IS_PROMISE_DRIVE) {
2371 if(promise_cmd(drive,PROMISE_IDENTIFY))
2372 return 1;
2373 } else
2374 #endif /* CONFIG_BLK_DEV_PROMISE */
2375 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2376 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2377 timeout += jiffies;
2378 do {
2379 if (jiffies > timeout) {
2380 if (!HWIF(drive)->irq)
2381 (void) probe_irq_off(irqs);
2382 return 1; /* drive timed-out */
2383 }
2384 delay_10ms(); /* give drive a breather */
2385 } while (IN_BYTE(hd_status) & BUSY_STAT);
2386
2387 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2388 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2389 unsigned long flags;
2390 save_flags(flags);
2391 cli(); /* some systems need this */
2392 do_identify(drive, cmd); /* drive returned ID */
2393 if (drive->present && drive->media != ide_tape) {
2394 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2395 if (tuneproc != NULL && drive->autotune == 1)
2396 tuneproc(drive, 255); /* auto-tune PIO mode */
2397 }
2398 rc = 0; /* drive responded with ID */
2399 (void) GET_STAT(); /* clear drive IRQ */
2400 restore_flags(flags);
2401 } else
2402 rc = 2; /* drive refused ID */
2403 if (!HWIF(drive)->irq) {
2404 irqs = probe_irq_off(irqs); /* get irq number */
2405 if (irqs > 0)
2406 HWIF(drive)->irq = irqs;
2407 else /* Mmmm.. multiple IRQs */
2408 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2409 }
2410 return rc;
2411 }
2412
2413 /*
2414 * do_probe() has the difficult job of finding a drive if it exists,
2415 * without getting hung up if it doesn't exist, without trampling on
2416 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2417 *
2418 * If a drive is "known" to exist (from CMOS or kernel parameters),
2419 * but does not respond right away, the probe will "hang in there"
2420 * for the maximum wait time (about 30 seconds), otherwise it will
2421 * exit much more quickly.
2422 *
2423 * Returns: 0 device was identified
2424 * 1 device timed-out (no response to identify request)
2425 * 2 device aborted the command (refused to identify itself)
2426 * 3 bad status from device (possible for ATAPI drives)
2427 * 4 probe was not attempted because failure was obvious
2428 */
2429 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2430 {
2431 int rc;
2432 ide_hwif_t *hwif;
2433 #ifdef CONFIG_BLK_DEV_IDEATAPI
2434 if (drive->present) { /* avoid waiting for inappropriate probes */
2435 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2436 return 4;
2437 }
2438 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2439 #ifdef DEBUG
2440 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2441 drive->name, drive->present, drive->media,
2442 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2443 #endif
2444 hwif = HWIF(drive);
2445 SELECT_DRIVE(hwif,drive);
2446 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2447 delay_10ms(); /* wait for BUSY_STAT */
2448 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2449 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2450 return 3; /* no i/f present: avoid killing ethernet cards */
2451 }
2452
2453 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2454 || drive->present || cmd == WIN_PIDENTIFY)
2455 {
2456 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2457 rc = try_to_identify(drive,cmd); /* failed: try again */
2458 if (rc == 1)
2459 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2460 (void) GET_STAT(); /* ensure drive irq is clear */
2461 } else {
2462 rc = 3; /* not present or maybe ATAPI */
2463 }
2464 if (drive->select.b.unit != 0) {
2465 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2466 delay_10ms();
2467 (void) GET_STAT(); /* ensure drive irq is clear */
2468 }
2469 return rc;
2470 }
2471
2472 /*
2473 * probe_for_drive() tests for existence of a given drive using do_probe().
2474 *
2475 * Returns: 0 no device was found
2476 * 1 device was found (note: drive->present might still be 0)
2477 */
2478 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2479 {
2480 if (drive->noprobe) /* skip probing? */
2481 return drive->present;
2482 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2483 #ifdef CONFIG_BLK_DEV_IDEATAPI
2484 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2485 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2486 }
2487 if (!drive->present)
2488 return 0; /* drive not found */
2489 if (drive->id == NULL) { /* identification failed? */
2490 if (drive->media == ide_disk) {
2491 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2492 drive->name, drive->cyl, drive->head, drive->sect);
2493 }
2494 #ifdef CONFIG_BLK_DEV_IDECD
2495 else if (drive->media == ide_cdrom) {
2496 printk("%s: ATAPI cdrom (?)\n", drive->name);
2497 }
2498 #endif /* CONFIG_BLK_DEV_IDECD */
2499 else {
2500 drive->present = 0; /* nuke it */
2501 }
2502 }
2503 return 1; /* drive was found */
2504 }
2505
2506 /*
2507 * This routine only knows how to look for drive units 0 and 1
2508 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2509 */
2510 static void probe_hwif (ide_hwif_t *hwif)
/* */
2511 {
2512 unsigned int unit;
2513
2514 #if CONFIG_BLK_DEV_PROMISE
2515 if (!hwif->is_promise2 &&
2516 (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2517 #else
2518 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2519 #endif /* CONFIG_BLK_DEV_PROMISE */
2520 int msgout = 0;
2521 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2522 ide_drive_t *drive = &hwif->drives[unit];
2523 if (drive->present) {
2524 drive->present = 0;
2525 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2526 msgout = 1;
2527 }
2528 }
2529 if (!msgout)
2530 printk("%s: ports already in use, skipping probe\n", hwif->name);
2531 } else {
2532 unsigned long flags;
2533 save_flags(flags);
2534
2535 sti(); /* needed for jiffies and irq probing */
2536 /*
2537 * Second drive should only exist if first drive was found,
2538 * but a lot of cdrom drives are configured as single slaves.
2539 */
2540 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2541 ide_drive_t *drive = &hwif->drives[unit];
2542 (void) probe_for_drive (drive);
2543 if (drive->present && drive->media == ide_disk) {
2544 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2545 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2546 drive->name, drive->head);
2547 drive->present = 0;
2548 }
2549 }
2550 if (drive->present && !hwif->present) {
2551 hwif->present = 1;
2552 request_region(hwif->io_base, 8, hwif->name);
2553 request_region(hwif->ctl_port, 1, hwif->name);
2554 }
2555 }
2556 restore_flags(flags);
2557 }
2558 }
2559
2560 /*
2561 * stridx() returns the offset of c within s,
2562 * or -1 if c is '\0' or not found within s.
2563 */
2564 static int stridx (const char *s, char c)
/* */
2565 {
2566 char *i = strchr(s, c);
2567 return (i && c) ? i - s : -1;
2568 }
2569
2570 /*
2571 * match_parm() does parsing for ide_setup():
2572 *
2573 * 1. the first char of s must be '='.
2574 * 2. if the remainder matches one of the supplied keywords,
2575 * the index (1 based) of the keyword is negated and returned.
2576 * 3. if the remainder is a series of no more than max_vals numbers
2577 * separated by commas, the numbers are saved in vals[] and a
2578 * count of how many were saved is returned. Base10 is assumed,
2579 * and base16 is allowed when prefixed with "0x".
2580 * 4. otherwise, zero is returned.
2581 */
2582 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2583 {
2584 static const char *decimal = "0123456789";
2585 static const char *hex = "0123456789abcdef";
2586 int i, n;
2587
2588 if (*s++ == '=') {
2589 /*
2590 * Try matching against the supplied keywords,
2591 * and return -(index+1) if we match one
2592 */
2593 for (i = 0; *keywords != NULL; ++i) {
2594 if (!strcmp(s, *keywords++))
2595 return -(i+1);
2596 }
2597 /*
2598 * Look for a series of no more than "max_vals"
2599 * numeric values separated by commas, in base10,
2600 * or base16 when prefixed with "0x".
2601 * Return a count of how many were found.
2602 */
2603 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2604 vals[n] = i;
2605 while ((i = stridx(decimal, *++s)) >= 0)
2606 vals[n] = (vals[n] * 10) + i;
2607 if (*s == 'x' && !vals[n]) {
2608 while ((i = stridx(hex, *++s)) >= 0)
2609 vals[n] = (vals[n] * 0x10) + i;
2610 }
2611 if (++n == max_vals)
2612 break;
2613 if (*s == ',')
2614 ++s;
2615 }
2616 if (!*s)
2617 return n;
2618 }
2619 return 0; /* zero = nothing matched */
2620 }
2621
2622 /*
2623 * ide_setup() gets called VERY EARLY during initialization,
2624 * to handle kernel "command line" strings beginning with "hdx="
2625 * or "ide". Here is the complete set currently supported:
2626 *
2627 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2628 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2629 *
2630 * "hdx=noprobe" : drive may be present, but do not probe for it
2631 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2632 * "hdx=cdrom" : drive is present, and is a cdrom drive
2633 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2634 * "hdx=autotune" : driver will attempt to tune interface speed
2635 * to the fastest PIO mode supported,
2636 * if possible for this drive only.
2637 * Not fully supported by all chipset types,
2638 * and quite likely to cause trouble with
2639 * older/odd IDE drives.
2640 *
2641 * "idex=noprobe" : do not attempt to access/use this interface
2642 * "idex=base" : probe for an interface at the addr specified,
2643 * where "base" is usually 0x1f0 or 0x170
2644 * and "ctl" is assumed to be "base"+0x206
2645 * "idex=base,ctl" : specify both base and ctl
2646 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2647 * "idex=autotune" : driver will attempt to tune interface speed
2648 * to the fastest PIO mode supported,
2649 * for all drives on this interface.
2650 * Not fully supported by all chipset types,
2651 * and quite likely to cause trouble with
2652 * older/odd IDE drives.
2653 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2654 * This is the default for most chipsets,
2655 * except the cmd640.
2656 * "idex=serialize" : do not overlap operations on idex and ide(x^1)
2657 *
2658 * The following are valid ONLY on ide0,
2659 * and the defaults for the base,ctl ports must not be altered.
2660 *
2661 * "ide0=dtc2278" : probe/support DTC2278 interface
2662 * "ide0=ht6560b" : probe/support HT6560B interface
2663 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2664 * (not for PCI -- automatically detected)
2665 * "ide0=qd6580" : probe/support qd6580 interface
2666 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2667 * "ide0=umc8672" : probe/support umc8672 chipsets
2668 */
2669 void ide_setup (char *s)
/* */
2670 {
2671 int i, vals[3];
2672 ide_hwif_t *hwif;
2673 ide_drive_t *drive;
2674 unsigned int hw, unit;
2675 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2676 const char max_hwif = '0' + (MAX_HWIFS - 1);
2677
2678 printk("ide_setup: %s", s);
2679 init_ide_data ();
2680
2681 /*
2682 * Look for drive options: "hdx="
2683 */
2684 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2685 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2686 "autotune", "noautotune", NULL};
2687 unit = s[2] - 'a';
2688 hw = unit / MAX_DRIVES;
2689 unit = unit % MAX_DRIVES;
2690 hwif = &ide_hwifs[hw];
2691 drive = &hwif->drives[unit];
2692 switch (match_parm(&s[3], hd_words, vals, 3)) {
2693 case -1: /* "noprobe" */
2694 drive->noprobe = 1;
2695 goto done;
2696 case -2: /* "nowerr" */
2697 drive->bad_wstat = BAD_R_STAT;
2698 hwif->noprobe = 0;
2699 goto done;
2700 case -3: /* "cdrom" */
2701 drive->present = 1;
2702 drive->media = ide_cdrom;
2703 hwif->noprobe = 0;
2704 goto done;
2705 case -4: /* "serialize" */
2706 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
2707 goto do_serialize;
2708 case -5: /* "autotune" */
2709 drive->autotune = 1;
2710 goto done;
2711 case -6: /* "noautotune" */
2712 drive->autotune = 2;
2713 goto done;
2714 case 3: /* cyl,head,sect */
2715 drive->media = ide_disk;
2716 drive->cyl = drive->bios_cyl = vals[0];
2717 drive->head = drive->bios_head = vals[1];
2718 drive->sect = drive->bios_sect = vals[2];
2719 drive->present = 1;
2720 drive->forced_geom = 1;
2721 hwif->noprobe = 0;
2722 goto done;
2723 default:
2724 goto bad_option;
2725 }
2726 }
2727 /*
2728 * Look for interface options: "idex="
2729 */
2730 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2731 /*
2732 * Be VERY CAREFUL changing this: note hardcoded indexes below
2733 */
2734 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2735 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
2736 hw = s[3] - '0';
2737 hwif = &ide_hwifs[hw];
2738 i = match_parm(&s[4], ide_words, vals, 3);
2739
2740 /*
2741 * Cryptic check to ensure chipset not already set for hwif:
2742 */
2743 if (i != -1 && i != -2) {
2744 if (hwif->chipset != ide_unknown)
2745 goto bad_option;
2746 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2747 goto bad_option;
2748 }
2749 /*
2750 * Interface keywords work only for ide0:
2751 */
2752 if (i <= -6 && hw != 0)
2753 goto bad_hwif;
2754
2755 switch (i) {
2756 #ifdef CONFIG_BLK_DEV_PROMISE
2757 case -11: /* "dc4030" */
2758 {
2759 setup_dc4030(hwif);
2760 goto done;
2761 }
2762 #endif /* CONFIG_BLK_DEV_PROMISE */
2763 #ifdef CONFIG_BLK_DEV_ALI14XX
2764 case -10: /* "ali14xx" */
2765 {
2766 extern void init_ali14xx (void);
2767 init_ali14xx();
2768 goto done;
2769 }
2770 #endif /* CONFIG_BLK_DEV_ALI14XX */
2771 #ifdef CONFIG_BLK_DEV_UMC8672
2772 case -9: /* "umc8672" */
2773 {
2774 extern void init_umc8672 (void);
2775 init_umc8672();
2776 goto done;
2777 }
2778 #endif /* CONFIG_BLK_DEV_UMC8672 */
2779 #ifdef CONFIG_BLK_DEV_DTC2278
2780 case -8: /* "dtc2278" */
2781 {
2782 extern void init_dtc2278 (void);
2783 init_dtc2278();
2784 goto done;
2785 }
2786 #endif /* CONFIG_BLK_DEV_DTC2278 */
2787 #ifdef CONFIG_BLK_DEV_CMD640
2788 case -7: /* "cmd640_vlb" */
2789 {
2790 extern int cmd640_vlb; /* flag for cmd640.c */
2791 cmd640_vlb = 1;
2792 goto done;
2793 }
2794 #endif /* CONFIG_BLK_DEV_CMD640 */
2795 #ifdef CONFIG_BLK_DEV_HT6560B
2796 case -6: /* "ht6560b" */
2797 {
2798 extern void init_ht6560b (void);
2799 init_ht6560b();
2800 goto done;
2801 }
2802 #endif /* CONFIG_BLK_DEV_HT6560B */
2803 #if CONFIG_BLK_DEV_QD6580
2804 case -5: /* "qd6580" (no secondary i/f) */
2805 {
2806 extern void init_qd6580 (void);
2807 init_qd6580();
2808 goto done;
2809 }
2810 #endif /* CONFIG_BLK_DEV_QD6580 */
2811 case -4: /* "noautotune" */
2812 hwif->drives[0].autotune = 2;
2813 hwif->drives[1].autotune = 2;
2814 goto done;
2815 case -3: /* "autotune" */
2816 hwif->drives[0].autotune = 1;
2817 hwif->drives[1].autotune = 1;
2818 goto done;
2819 case -2: /* "serialize" */
2820 do_serialize:
2821 ide_hwifs[hw].serialized = 1; /* serialize */
2822 ide_hwifs[hw^1].serialized = 1; /* with mate */
2823 goto done;
2824
2825 case -1: /* "noprobe" */
2826 hwif->noprobe = 1;
2827 goto done;
2828
2829 case 1: /* base */
2830 vals[1] = vals[0] + 0x206; /* default ctl */
2831 case 2: /* base,ctl */
2832 vals[2] = 0; /* default irq = probe for it */
2833 case 3: /* base,ctl,irq */
2834 hwif->io_base = vals[0];
2835 hwif->ctl_port = vals[1];
2836 hwif->irq = vals[2];
2837 hwif->noprobe = 0;
2838 hwif->chipset = ide_generic;
2839 goto done;
2840
2841 case 0: goto bad_option;
2842 default:
2843 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2844 return;
2845 }
2846 }
2847 bad_option:
2848 printk(" -- BAD OPTION\n");
2849 return;
2850 bad_hwif:
2851 printk("-- NOT SUPPORTED ON ide%d", hw);
2852 done:
2853 printk("\n");
2854 }
2855
2856 /*
2857 * This routine is called from the partition-table code in genhd.c
2858 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2859 *
2860 * The second parameter, "xparm", determines exactly how the translation
2861 * will be handled:
2862 * 0 = convert to CHS with fewer than 1024 cyls
2863 * using the same method as Ontrack DiskManager.
2864 * 1 = same as "0", plus offset everything by 63 sectors.
2865 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2866 * >1 = convert to a CHS geometry with "xparm" heads.
2867 *
2868 * Returns 0 if the translation was not possible, if the device was not
2869 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2870 * Returns 1 if the geometry translation was successful.
2871 */
2872 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2873 {
2874 ide_drive_t *drive;
2875 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2876 const byte *heads = head_vals;
2877 unsigned long tracks;
2878
2879 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2880 return 0;
2881
2882 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2883 return 0; /* we already have a translation */
2884
2885 printk("%s ", msg);
2886
2887 if (drive->id) {
2888 drive->cyl = drive->id->cyls;
2889 drive->head = drive->id->heads;
2890 drive->sect = drive->id->sectors;
2891 }
2892 drive->bios_cyl = drive->cyl;
2893 drive->bios_head = drive->head;
2894 drive->bios_sect = drive->sect;
2895 drive->special.b.set_geometry = 1;
2896
2897 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2898 drive->bios_sect = 63;
2899 if (xparm > 1) {
2900 drive->bios_head = xparm;
2901 drive->bios_cyl = tracks / drive->bios_head;
2902 } else {
2903 while (drive->bios_cyl >= 1024) {
2904 drive->bios_head = *heads;
2905 drive->bios_cyl = tracks / drive->bios_head;
2906 if (0 == *++heads)
2907 break;
2908 }
2909 #if FAKE_FDISK_FOR_EZDRIVE
2910 if (xparm == -1) {
2911 drive->remap_0_to_1 = 1;
2912 msg = "0->1";
2913 } else
2914 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2915 if (xparm == 1) {
2916 drive->sect0 = 63;
2917 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2918 msg = "+63";
2919 }
2920 printk("[remap %s] ", msg);
2921 }
2922 drive->part[0].nr_sects = current_capacity(drive);
2923 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2924 return 1;
2925 }
2926
2927 /*
2928 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2929 * controller that is BIOS compatible with ST-506, and thus showing up in our
2930 * BIOS table, but not register compatible, and therefore not present in CMOS.
2931 *
2932 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2933 * drives in the system -- the ones reflected as drive 1 or 2. The first
2934 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2935 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2936 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2937 * means we have an AT controller hard disk for that drive.
2938 *
2939 * Of course, there is no guarantee that either drive is actually on the
2940 * "primary" IDE interface, but we don't bother trying to sort that out here.
2941 * If a drive is not actually on the primary interface, then these parameters
2942 * will be ignored. This results in the user having to supply the logical
2943 * drive geometry as a boot parameter for each drive not on the primary i/f.
2944 *
2945 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2946 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2947 * for us during initialization. I have the necessary docs -- any takers? -ml
2948 */
2949
2950 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2951 {
2952 #ifdef __i386__
2953 extern struct drive_info_struct drive_info;
2954 byte cmos_disks, *BIOS = (byte *) &drive_info;
2955 int unit;
2956
2957 #ifdef CONFIG_BLK_DEV_PROMISE
2958 if (hwif->is_promise2)
2959 return;
2960 #endif /* CONFIG_BLK_DEV_PROMISE */
2961 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2962 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2963 /* Extract drive geometry from CMOS+BIOS if not already setup */
2964 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2965 ide_drive_t *drive = &hwif->drives[unit];
2966 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2967 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2968 drive->head = drive->bios_head = *(BIOS+2);
2969 drive->sect = drive->bios_sect = *(BIOS+14);
2970 drive->ctl = *(BIOS+8);
2971 drive->present = 1;
2972 }
2973 BIOS += 16;
2974 }
2975 #endif
2976 }
2977
2978 /*
2979 * This routine sets up the irq for an ide interface, and creates a new
2980 * hwgroup for the irq/hwif if none was previously assigned.
2981 *
2982 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2983 * interrupts completely disabled. This can be bad for interrupt latency,
2984 * but anything else has led to problems on some machines. We re-enable
2985 * interrupts as much as we can safely do in most places.
2986 */
2987 static int init_irq (ide_hwif_t *hwif)
/* */
2988 {
2989 unsigned long flags;
2990 ide_hwgroup_t *hwgroup = hwif->hwgroup;
2991 ide_hwif_t *mate_hwif;
2992 unsigned int index, mate_irq = hwif->irq;
2993
2994 save_flags(flags);
2995 cli();
2996
2997 /*
2998 * Handle serialization, regardless of init sequence
2999 */
3000 mate_hwif = &ide_hwifs[hwif->index ^ 1];
3001 if (hwif->serialized && mate_hwif->present)
3002 mate_irq = mate_hwif->irq;
3003
3004 /*
3005 * Group up with any other hwifs that share our irq(s)
3006 */
3007 for (index = 0; index < MAX_HWIFS; index++) {
3008 if (index != hwif->index) {
3009 ide_hwif_t *g = &ide_hwifs[index];
3010 if (g->irq == hwif->irq || g->irq == mate_irq) {
3011 if (hwgroup && !g->hwgroup)
3012 g->hwgroup = hwgroup;
3013 else if (!hwgroup)
3014 hwgroup = g->hwgroup;
3015 }
3016 }
3017 }
3018
3019 /*
3020 * If we are still without a hwgroup, then form a new one
3021 */
3022 if (hwgroup == NULL) {
3023 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
3024 hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3025 hwgroup->rq = NULL;
3026 hwgroup->handler = NULL;
3027 if (hwif->drives[0].present)
3028 hwgroup->drive = &hwif->drives[0];
3029 else
3030 hwgroup->drive = &hwif->drives[1];
3031 hwgroup->poll_timeout = 0;
3032 init_timer(&hwgroup->timer);
3033 hwgroup->timer.function = &timer_expiry;
3034 hwgroup->timer.data = (unsigned long) hwgroup;
3035 }
3036
3037 /*
3038 * Allocate the irq, if not already obtained for another hwif
3039 */
3040 if (!hwif->got_irq) {
3041 if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, hwgroup)) {
3042 restore_flags(flags);
3043 return 1;
3044 }
3045 for (index = 0; index < MAX_HWIFS; index++) {
3046 ide_hwif_t *g = &ide_hwifs[index];
3047 if (g->irq == hwif->irq)
3048 g->got_irq = 1;
3049 }
3050 }
3051
3052 /*
3053 * Everything is okay, so link us into the hwgroup
3054 */
3055 hwif->hwgroup = hwgroup;
3056 hwif->next = hwgroup->hwif->next;
3057 hwgroup->hwif->next = hwif;
3058
3059 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3060
3061 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3062 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3063 if (hwgroup->hwif != hwif)
3064 printk(" (serialized with %s)", hwgroup->hwif->name);
3065 printk("\n");
3066 return 0;
3067 }
3068
3069 static struct file_operations ide_fops = {
3070 NULL, /* lseek - default */
3071 block_read, /* read - general block-dev read */
3072 block_write, /* write - general block-dev write */
3073 NULL, /* readdir - bad */
3074 NULL, /* select */
3075 ide_ioctl, /* ioctl */
3076 NULL, /* mmap */
3077 ide_open, /* open */
3078 ide_release, /* release */
3079 block_fsync /* fsync */
3080 ,NULL, /* fasync */
3081 ide_check_media_change, /* check_media_change */
3082 revalidate_disk /* revalidate */
3083 };
3084
3085 #ifdef CONFIG_PCI
3086 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3087
3088 typedef void (ide_pci_init_proc_t)(byte, byte);
3089
3090 /*
3091 * ide_probe_pci() scans PCI for a specific vendor/device function,
3092 * and invokes the supplied init routine for each instance detected.
3093 */
3094 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
3095 {
3096 unsigned long flags;
3097 unsigned index;
3098 byte fn, bus;
3099
3100 save_flags(flags);
3101 cli();
3102 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3103 init (bus, fn + func_adj);
3104 }
3105 restore_flags(flags);
3106 }
3107
3108 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3109 #endif /* CONFIG_PCI */
3110
3111 /*
3112 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3113 *
3114 * This routine should ideally be using pcibios_find_class() to find
3115 * all IDE interfaces, but that function causes some systems to "go weird".
3116 */
3117 static void probe_for_hwifs (void)
/* */
3118 {
3119 #ifdef CONFIG_PCI
3120 /*
3121 * Find/initialize PCI IDE interfaces
3122 */
3123 if (pcibios_present()) {
3124 #ifdef CONFIG_BLK_DEV_RZ1000
3125 ide_pci_init_proc_t init_rz1000;
3126 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3127 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3128 #endif /* CONFIG_BLK_DEV_RZ1000 */
3129 #ifdef CONFIG_BLK_DEV_TRITON
3130 /*
3131 * Apparently the BIOS32 services on Intel motherboards are
3132 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3133 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3134 * and then add 1.
3135 */
3136 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3137 #endif /* CONFIG_BLK_DEV_TRITON */
3138 }
3139 #endif /* CONFIG_PCI */
3140 #ifdef CONFIG_BLK_DEV_CMD640
3141 {
3142 extern void ide_probe_for_cmd640x (void);
3143 ide_probe_for_cmd640x();
3144 }
3145 #endif
3146 #ifdef CONFIG_BLK_DEV_PROMISE
3147 init_dc4030();
3148 #endif
3149 }
3150
3151 static int hwif_init (int h)
/* */
3152 {
3153 ide_hwif_t *hwif = &ide_hwifs[h];
3154 void (*rfn)(void);
3155
3156 if (hwif->noprobe)
3157 return 0;
3158 else {
3159 if (hwif->io_base == HD_DATA)
3160 probe_cmos_for_drives (hwif);
3161 probe_hwif (hwif);
3162 if (!hwif->present)
3163 return 0;
3164 }
3165 if (!hwif->irq) {
3166 if (!(hwif->irq = default_irqs[h])) {
3167 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3168 return (hwif->present = 0);
3169 }
3170 }
3171 #ifdef CONFIG_BLK_DEV_HD
3172 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3173 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3174 return (hwif->present = 0);
3175 }
3176 #endif /* CONFIG_BLK_DEV_HD */
3177
3178 hwif->present = 0; /* we set it back to 1 if all is ok below */
3179 switch (hwif->major) {
3180 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3181 #if MAX_HWIFS > 1
3182 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3183 #endif
3184 #if MAX_HWIFS > 2
3185 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3186 #endif
3187 #if MAX_HWIFS > 3
3188 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3189 #endif
3190 default:
3191 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3192 return (hwif->present = 0);
3193 }
3194 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3195 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3196 } else if (init_irq (hwif)) {
3197 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3198 (void) unregister_blkdev (hwif->major, hwif->name);
3199 } else {
3200 init_gendisk(hwif);
3201 blk_dev[hwif->major].request_fn = rfn;
3202 read_ahead[hwif->major] = 8; /* (4kB) */
3203 hwif->present = 1; /* success */
3204 }
3205 return hwif->present;
3206 }
3207
3208 /*
3209 * This is gets invoked once during initialization, to set *everything* up
3210 */
3211 int ide_init (void)
/* */
3212 {
3213 int index;
3214
3215 init_ide_data ();
3216 /*
3217 * Probe for special "known" interface chipsets
3218 */
3219 probe_for_hwifs ();
3220
3221 /*
3222 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3223 */
3224 for (index = 0; index < MAX_HWIFS; ++index)
3225 hwif_init (index);
3226
3227 #ifdef CONFIG_BLK_DEV_IDETAPE
3228 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3229 #endif /* CONFIG_BLK_DEV_IDETAPE */
3230
3231 return 0;
3232 }
3233
3234 #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3235 int ide_register(int io_base, int ctl_port, int irq)
/* */
3236 {
3237 int index, i, rc = -1;
3238 ide_hwif_t *hwif;
3239 unsigned long flags;
3240
3241 save_flags(flags);
3242 cli();
3243 for (index = 0; index < MAX_HWIFS; ++index) {
3244 hwif = &ide_hwifs[index];
3245 if (hwif->present) {
3246 if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3247 break; /* this ide port already exists */
3248 } else {
3249 hwif->io_base = io_base;
3250 hwif->ctl_port = ctl_port;
3251 hwif->irq = irq;
3252 hwif->noprobe = 0;
3253 if (!hwif_init(index))
3254 break;
3255 for (i = 0; i < hwif->gd->nr_real; i++)
3256 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3257 rc = index;
3258 break;
3259 }
3260 }
3261 restore_flags(flags);
3262 return rc;
3263 }
3264
3265 void ide_unregister (unsigned int index)
/* ![[last]](../icons/n_last.png)
*/
3266 {
3267 struct gendisk *gd, **gdp;
3268 ide_hwif_t *hwif, *g;
3269 ide_hwgroup_t *hwgroup;
3270 int irq_count = 0;
3271 unsigned long flags;
3272
3273 if (index >= MAX_HWIFS)
3274 return;
3275 save_flags(flags);
3276 cli();
3277 hwif = &ide_hwifs[index];
3278 if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3279 restore_flags(flags);
3280 return;
3281 }
3282 hwif->present = 0;
3283 hwgroup = hwif->hwgroup;
3284
3285 /*
3286 * free the irq if we were the only hwif using it
3287 */
3288 g = hwgroup->hwif;
3289 do {
3290 if (g->irq == hwif->irq)
3291 ++irq_count;
3292 g = g->next;
3293 } while (g != hwgroup->hwif);
3294 if (irq_count == 1)
3295 free_irq(hwif->irq, hwgroup);
3296
3297 /*
3298 * Note that we only release the standard ports,
3299 * and do not even try to handle any extra ports
3300 * allocated for weird IDE interface chipsets.
3301 */
3302 release_region(hwif->io_base, 8);
3303 release_region(hwif->ctl_port, 1);
3304
3305 /*
3306 * Remove us from the hwgroup, and free
3307 * the hwgroup if we were the only member
3308 */
3309 while (hwgroup->hwif->next != hwif)
3310 hwgroup->hwif = hwgroup->hwif->next;
3311 hwgroup->hwif->next = hwif->next;
3312 if (hwgroup->hwif == hwif)
3313 hwgroup->hwif = hwif->next;
3314 if (hwgroup->next_hwif == hwif)
3315 hwgroup->next_hwif = hwif->next;
3316 if (hwgroup->hwif == hwif)
3317 kfree(hwgroup);
3318
3319 /*
3320 * Remove us from the kernel's knowledge
3321 */
3322 unregister_blkdev(hwif->major, hwif->name);
3323 kfree(blksize_size[hwif->major]);
3324 blk_dev[hwif->major].request_fn = NULL;
3325 blksize_size[hwif->major] = NULL;
3326 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
3327 if (*gdp == hwif->gd)
3328 break;
3329 if (*gdp == NULL)
3330 printk("gd not in disk chain!\n");
3331 else {
3332 gd = *gdp; *gdp = gd->next;
3333 kfree(gd->sizes);
3334 kfree(gd->part);
3335 kfree(gd);
3336 }
3337 init_hwif_data (index); /* restore hwif data to pristine status */
3338 restore_flags(flags);
3339 }
3340 #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/