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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 * removeable drive support from scuba@cs.tu-berlin.de
112 * add transparent support for DiskManager-6.0x "Dynamic
113 * Disk Overlay" (DDO), most of this is in genhd.c
114 * eliminate "multiple mode turned off" message at boot
115 * Version 4.10 fix bug in ioctl for "hdparm -c3"
116 * fix DM6:DDO support -- now works with LILO, fdisk, ...
117 * don't treat some naughty WD drives as removeable
118 * Version 4.11 updated DM6 support using info provided by OnTrack
119 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
120 * added support for 3rd/4th/alternative IDE ports
121 * created ide.h; ide-cd.c now compiles separate from ide.c
122 * hopefully fixed infinite "unexpected_intr" from cdroms
123 * zillions of other changes and restructuring
124 * somehow reduced overall memory usage by several kB
125 * probably slowed things down slightly, but worth it
126 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
127 * was happening at various times/places: whenever the
128 * ide-interface's ctl_port was used to "mask" the irq,
129 * it also would trigger an edge in the process of masking
130 * which would result in a self-inflicted interrupt!!
131 * (such a stupid way to build a hardware interrupt mask).
132 * This is now fixed (after a year of head-scratching).
133 * Version 5.02 got rid of need for {enable,disable}_irq_list()
134 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
135 * removed PROBE_FOR_IRQS option -- no longer needed
136 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
137 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
138 * added more comments, cleaned up unexpected_intr()
139 * OOOPS! fixed null pointer problem in ide reset code
140 * added autodetect for Triton chipset -- no effect yet
141 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
142 * OOOPS! fixed bug in ide_do_request()
143 * added ATAPI reset sequence for cdroms
144 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
145 * some (mostly) cosmetic changes
146 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
147 * reworked PCI scanning code
148 * added automatic RZ1000 detection/support
149 * added automatic PCI CMD640 detection/support
150 * added option for VLB CMD640 support
151 * tweaked probe to find cdrom on hdb with disks on hda,hdc
152 * Version 5.12 some performance tuning
153 * added message to alert user to bad /dev/hd[cd] entries
154 * OOOPS! fixed bug in atapi reset
155 * driver now forces "serialize" again for all cmd640 chips
156 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
157 * made do_drive_cmd() into public ide_do_drive_cmd()
158 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
159 * fixed ht6560b support
160 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
161 * don't bother invalidating nonexistent partitions
162 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
163 * added & tested full EZ-DRIVE support -- don't use LILO!
164 * don't enable 2nd CMD640 PCI port during init - conflict
165 * Version 5.15 bug fix in init_cmd640_vlb()
166 * bug fix in interrupt sharing code
167 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
168 * remove "Huh?" from cmd640 code
169 * added qd6580 interface speed select from Colten Edwards
170 * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
171 * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
172 * new UMC8672 code, moved to umc8672.c, #include'd for now
173 * disallow turning on DMA when h/w not capable of DMA
174 * Version 5.19 fix potential infinite timeout on resets
175 * extend reset poll into a general purpose polling scheme
176 * add atapi tape drive support from Gadi Oxman
177 * simplify exit from _intr routines -- no IDE_DO_REQUEST
178 * Version 5.20 leave current rq on blkdev request list during I/O
179 * generalized ide_do_drive_cmd() for tape/cdrom driver use
180 * Version 5.21 fix nasty cdrom/tape bug (ide_preempt was messed up)
181 * Version 5.22 fix ide_xlate_1024() to work with/without drive->id
182 * Version 5.23 miscellaneous touch-ups
183 * Version 5.24 fix #if's for SUPPORT_CMD640
184 * Version 5.25 more touch-ups, fix cdrom resets, ...
185 * cmd640.c now configs/compiles separate from ide.c
186 * Version 5.26 keep_settings now maintains the using_dma flag
187 * fix [EZD] remap message to only output at boot time
188 * fix "bad /dev/ entry" message to say hdc, not hdc0
189 * fix ide_xlate_1024() to respect user specified CHS
190 * use CHS from partn table if it looks translated
191 * re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
192 * keep track of interface chipset type, when known
193 * add generic PIO mode "tuneproc" mechanism
194 * fix cmd640_vlb option
195 * fix ht6560b support (was completely broken)
196 * umc8672.c now configures/compiles separate from ide.c
197 * move dtc2278 support to dtc2278.c
198 * move ht6560b support to ht6560b.c
199 * move qd6580 support to qd6580.c
200 * add ali14xx support in ali14xx.c
201 * Version 5.27 add [no]autotune parameters to help cmd640
202 * move rz1000 support to rz1000.c
203 * Version 5.28 #include "ide_modes.h"
204 * fix disallow_unmask: now per-interface "no_unmask" bit
205 * force io_32bit to be the same on drive pairs of dtc2278
206 * improved IDE tape error handling, and tape DMA support
207 * bugfix in ide_do_drive_cmd() for cdroms + serialize
208 * Version 5.29 fixed non-IDE check for too many physical heads
209 * don't use LBA if capacity is smaller than CHS
210 * Version 5.30 remove real_devices kludge, formerly used by genhd.c
211 * 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 overriden 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 if (!IS_PROMISE_DRIVE) {
511 drive->select.b.lba = 0;
512 /* Determine capacity, and use LBA if the drive properly supports it */
513 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
514 if (id->lba_capacity >= capacity) {
515 capacity = id->lba_capacity;
516 drive->select.b.lba = 1;
517 }
518 }
519 }
520 return (capacity - drive->sect0);
521 }
522
523 /*
524 * ide_geninit() is called exactly *once* for each major, from genhd.c,
525 * at the beginning of the initial partition check for the drives.
526 */
527 static void ide_geninit (struct gendisk *gd)
/* */
528 {
529 unsigned int unit;
530 ide_hwif_t *hwif = gd->real_devices;
531
532 for (unit = 0; unit < gd->nr_real; ++unit) {
533 ide_drive_t *drive = &hwif->drives[unit];
534 #ifdef CONFIG_BLK_DEV_IDECD
535 if (drive->present && drive->media == ide_cdrom)
536 ide_cdrom_setup(drive);
537 #endif /* CONFIG_BLK_DEV_IDECD */
538 #ifdef CONFIG_BLK_DEV_IDETAPE
539 if (drive->present && drive->media == ide_tape)
540 idetape_setup(drive);
541 #endif /* CONFIG_BLK_DEV_IDETAPE */
542 drive->part[0].nr_sects = current_capacity(drive);
543 if (!drive->present || drive->media != ide_disk) {
544 drive->part[0].start_sect = -1; /* skip partition check */
545 }
546 }
547 }
548
549 /*
550 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
551 * after probing for drives, to allocate partition tables and other data
552 * structures needed for the routines in genhd.c. ide_geninit() gets called
553 * somewhat later, during the partition check.
554 */
555 static void init_gendisk (ide_hwif_t *hwif)
/* */
556 {
557 struct gendisk *gd, **gdp;
558 unsigned int unit, units, minors;
559 int *bs;
560
561 /* figure out maximum drive number on the interface */
562 for (units = MAX_DRIVES; units > 0; --units) {
563 if (hwif->drives[units-1].present)
564 break;
565 }
566 minors = units * (1<<PARTN_BITS);
567 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
568 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
569 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
570 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
571
572 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
573 blksize_size[hwif->major] = bs;
574 for (unit = 0; unit < minors; ++unit)
575 *bs++ = BLOCK_SIZE;
576
577 for (unit = 0; unit < units; ++unit)
578 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
579
580 gd->major = hwif->major; /* our major device number */
581 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
582 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
583 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
584 gd->max_nr = units; /* max num real drives */
585 gd->nr_real = units; /* current num real drives */
586 gd->init = ide_geninit; /* initialization function */
587 gd->real_devices= hwif; /* ptr to internal data */
588 gd->next = NULL; /* linked list of major devs */
589
590 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
591 hwif->gd = *gdp = gd; /* link onto tail of list */
592 }
593
594 static void do_reset1 (ide_drive_t *, int); /* needed below */
595
596 #ifdef CONFIG_BLK_DEV_IDEATAPI
597 /*
598 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
599 * during an atapi drive reset operation. If the drive has not yet responded,
600 * and we have not yet hit our maximum waiting time, then the timer is restarted
601 * for another 50ms.
602 */
603 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
604 {
605 ide_hwgroup_t *hwgroup = HWGROUP(drive);
606 byte stat;
607
608 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
609 udelay (10);
610
611 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
612 printk("%s: ATAPI reset complete\n", drive->name);
613 } else {
614 if (jiffies < hwgroup->poll_timeout) {
615 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
616 return; /* continue polling */
617 }
618 hwgroup->poll_timeout = 0; /* end of polling */
619 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
620 do_reset1 (drive, 1); /* do it the old fashioned way */
621 }
622 hwgroup->poll_timeout = 0; /* done polling */
623 }
624 #endif /* CONFIG_BLK_DEV_IDEATAPI */
625
626 /*
627 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
628 * during an ide reset operation. If the drives have not yet responded,
629 * and we have not yet hit our maximum waiting time, then the timer is restarted
630 * for another 50ms.
631 */
632 static void reset_pollfunc (ide_drive_t *drive)
/* */
633 {
634 ide_hwgroup_t *hwgroup = HWGROUP(drive);
635 ide_hwif_t *hwif = HWIF(drive);
636 byte tmp;
637
638 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
639 if (jiffies < hwgroup->poll_timeout) {
640 ide_set_handler (drive, &reset_pollfunc, HZ/20);
641 return; /* continue polling */
642 }
643 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
644 } else {
645 printk("%s: reset: ", hwif->name);
646 if ((tmp = GET_ERR()) == 1)
647 printk("success\n");
648 else {
649 #if FANCY_STATUS_DUMPS
650 printk("master: ");
651 switch (tmp & 0x7f) {
652 case 1: printk("passed");
653 break;
654 case 2: printk("formatter device error");
655 break;
656 case 3: printk("sector buffer error");
657 break;
658 case 4: printk("ECC circuitry error");
659 break;
660 case 5: printk("controlling MPU error");
661 break;
662 default:printk("error (0x%02x?)", tmp);
663 }
664 if (tmp & 0x80)
665 printk("; slave: failed");
666 printk("\n");
667 #else
668 printk("failed\n");
669 #endif /* FANCY_STATUS_DUMPS */
670 }
671 }
672 hwgroup->poll_timeout = 0; /* done polling */
673 }
674
675 /*
676 * do_reset1() attempts to recover a confused drive by resetting it.
677 * Unfortunately, resetting a disk drive actually resets all devices on
678 * the same interface, so it can really be thought of as resetting the
679 * interface rather than resetting the drive.
680 *
681 * ATAPI devices have their own reset mechanism which allows them to be
682 * individually reset without clobbering other devices on the same interface.
683 *
684 * Unfortunately, the IDE interface does not generate an interrupt to let
685 * us know when the reset operation has finished, so we must poll for this.
686 * Equally poor, though, is the fact that this may a very long time to complete,
687 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
688 * we set a timer to poll at 50ms intervals.
689 */
690 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
691 {
692 unsigned int unit;
693 unsigned long flags;
694 ide_hwif_t *hwif = HWIF(drive);
695 ide_hwgroup_t *hwgroup = HWGROUP(drive);
696
697 save_flags(flags);
698 cli(); /* Why ? */
699
700 #ifdef CONFIG_BLK_DEV_IDEATAPI
701 /* For an ATAPI device, first try an ATAPI SRST. */
702 if (drive->media != ide_disk) {
703 if (!do_not_try_atapi) {
704 if (!drive->keep_settings)
705 drive->unmask = 0;
706 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
707 udelay (20);
708 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
709 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
710 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
711 restore_flags (flags);
712 return;
713 }
714 }
715 #endif /* CONFIG_BLK_DEV_IDEATAPI */
716
717 /*
718 * First, reset any device state data we were maintaining
719 * for any of the drives on this interface.
720 */
721 for (unit = 0; unit < MAX_DRIVES; ++unit) {
722 ide_drive_t *rdrive = &hwif->drives[unit];
723 rdrive->special.all = 0;
724 rdrive->special.b.set_geometry = 1;
725 rdrive->special.b.recalibrate = 1;
726 if (OK_TO_RESET_CONTROLLER)
727 rdrive->mult_count = 0;
728 if (!rdrive->keep_settings) {
729 rdrive->mult_req = 0;
730 rdrive->unmask = 0;
731 if (rdrive->using_dma) {
732 rdrive->using_dma = 0;
733 printk("%s: disabled DMA\n", rdrive->name);
734 }
735 }
736 if (rdrive->mult_req != rdrive->mult_count)
737 rdrive->special.b.set_multmode = 1;
738 }
739
740 #if OK_TO_RESET_CONTROLLER
741 /*
742 * Note that we also set nIEN while resetting the device,
743 * to mask unwanted interrupts from the interface during the reset.
744 * However, due to the design of PC hardware, this will cause an
745 * immediate interrupt due to the edge transition it produces.
746 * This single interrupt gives us a "fast poll" for drives that
747 * recover from reset very quickly, saving us the first 50ms wait time.
748 */
749 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
750 udelay(5); /* more than enough time */
751 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
752 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
753 ide_set_handler (drive, &reset_pollfunc, HZ/20);
754 #endif /* OK_TO_RESET_CONTROLLER */
755
756 restore_flags (flags);
757 }
758
759 /*
760 * ide_do_reset() is the entry point to the drive/interface reset code.
761 */
762 void ide_do_reset (ide_drive_t *drive)
/* */
763 {
764 do_reset1 (drive, 0);
765 #ifdef CONFIG_BLK_DEV_IDETAPE
766 if (drive->media == ide_tape)
767 drive->tape.reset_issued=1;
768 #endif /* CONFIG_BLK_DEV_IDETAPE */
769 }
770
771 /*
772 * Clean up after success/failure of an explicit drive cmd
773 */
774 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
775 {
776 unsigned long flags;
777 struct request *rq = HWGROUP(drive)->rq;
778
779 if (rq->cmd == IDE_DRIVE_CMD) {
780 byte *args = (byte *) rq->buffer;
781 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
782 if (args) {
783 args[0] = stat;
784 args[1] = err;
785 args[2] = IN_BYTE(IDE_NSECTOR_REG);
786 }
787 }
788 save_flags(flags);
789 cli();
790 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
791 HWGROUP(drive)->rq = NULL;
792 rq->rq_status = RQ_INACTIVE;
793 if (rq->sem != NULL)
794 up(rq->sem);
795 restore_flags(flags);
796 }
797
798 /*
799 * Error reporting, in human readable form (luxurious, but a memory hog).
800 */
801 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
802 {
803 unsigned long flags;
804 byte err = 0;
805
806 save_flags (flags);
807 sti();
808 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
809 #if FANCY_STATUS_DUMPS
810 if (drive->media == ide_disk) {
811 printk(" { ");
812 if (stat & BUSY_STAT)
813 printk("Busy ");
814 else {
815 if (stat & READY_STAT) printk("DriveReady ");
816 if (stat & WRERR_STAT) printk("DeviceFault ");
817 if (stat & SEEK_STAT) printk("SeekComplete ");
818 if (stat & DRQ_STAT) printk("DataRequest ");
819 if (stat & ECC_STAT) printk("CorrectedError ");
820 if (stat & INDEX_STAT) printk("Index ");
821 if (stat & ERR_STAT) printk("Error ");
822 }
823 printk("}");
824 }
825 #endif /* FANCY_STATUS_DUMPS */
826 printk("\n");
827 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
828 err = GET_ERR();
829 printk("%s: %s: error=0x%02x", drive->name, msg, err);
830 #if FANCY_STATUS_DUMPS
831 if (drive->media == ide_disk) {
832 printk(" { ");
833 if (err & BBD_ERR) printk("BadSector ");
834 if (err & ECC_ERR) printk("UncorrectableError ");
835 if (err & ID_ERR) printk("SectorIdNotFound ");
836 if (err & ABRT_ERR) printk("DriveStatusError ");
837 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
838 if (err & MARK_ERR) printk("AddrMarkNotFound ");
839 printk("}");
840 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
841 byte cur = IN_BYTE(IDE_SELECT_REG);
842 if (cur & 0x40) { /* using LBA? */
843 printk(", LBAsect=%ld", (unsigned long)
844 ((cur&0xf)<<24)
845 |(IN_BYTE(IDE_HCYL_REG)<<16)
846 |(IN_BYTE(IDE_LCYL_REG)<<8)
847 | IN_BYTE(IDE_SECTOR_REG));
848 } else {
849 printk(", CHS=%d/%d/%d",
850 (IN_BYTE(IDE_HCYL_REG)<<8) +
851 IN_BYTE(IDE_LCYL_REG),
852 cur & 0xf,
853 IN_BYTE(IDE_SECTOR_REG));
854 }
855 if (HWGROUP(drive)->rq)
856 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
857 }
858 }
859 #endif /* FANCY_STATUS_DUMPS */
860 printk("\n");
861 }
862 restore_flags (flags);
863 return err;
864 }
865
866 /*
867 * try_to_flush_leftover_data() is invoked in response to a drive
868 * unexpectedly having its DRQ_STAT bit set. As an alternative to
869 * resetting the drive, this routine tries to clear the condition
870 * by read a sector's worth of data from the drive. Of course,
871 * this may not help if the drive is *waiting* for data from *us*.
872 */
873 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
874 {
875 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
876
877 while (i > 0) {
878 unsigned long buffer[16];
879 unsigned int wcount = (i > 16) ? 16 : i;
880 i -= wcount;
881 ide_input_data (drive, buffer, wcount);
882 }
883 }
884
885 /*
886 * ide_error() takes action based on the error returned by the controller.
887 */
888 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
889 {
890 struct request *rq;
891 byte err;
892
893 err = ide_dump_status(drive, msg, stat);
894 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
895 return;
896 /* retry only "normal" I/O: */
897 if (rq->cmd == IDE_DRIVE_CMD) {
898 rq->errors = 1;
899 ide_end_drive_cmd(drive, stat, err);
900 return;
901 }
902 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
903 rq->errors |= ERROR_RESET;
904 } else {
905 if (drive->media == ide_disk && (stat & ERR_STAT)) {
906 /* err has different meaning on cdrom and tape */
907 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
908 rq->errors = ERROR_MAX;
909 else if (err & TRK0_ERR) /* help it find track zero */
910 rq->errors |= ERROR_RECAL;
911 }
912 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
913 try_to_flush_leftover_data(drive);
914 }
915 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
916 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
917
918 if (rq->errors >= ERROR_MAX) {
919 #ifdef CONFIG_BLK_DEV_IDETAPE
920 if (drive->media == ide_tape) {
921 rq->errors = 0;
922 idetape_end_request(0, HWGROUP(drive));
923 }
924 else
925 #endif /* CONFIG_BLK_DEV_IDETAPE */
926 ide_end_request(0, HWGROUP(drive));
927 }
928 else {
929 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
930 ++rq->errors;
931 ide_do_reset(drive);
932 return;
933 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
934 drive->special.b.recalibrate = 1;
935 ++rq->errors;
936 }
937 }
938
939 /*
940 * read_intr() is the handler for disk read/multread interrupts
941 */
942 static void read_intr (ide_drive_t *drive)
/* */
943 {
944 byte stat;
945 int i;
946 unsigned int msect, nsect;
947 struct request *rq;
948
949 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
950 ide_error(drive, "read_intr", stat);
951 return;
952 }
953 msect = drive->mult_count;
954 read_next:
955 rq = HWGROUP(drive)->rq;
956 if (msect) {
957 if ((nsect = rq->current_nr_sectors) > msect)
958 nsect = msect;
959 msect -= nsect;
960 } else
961 nsect = 1;
962 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
963 #ifdef DEBUG
964 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
965 drive->name, rq->sector, rq->sector+nsect-1,
966 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
967 #endif
968 rq->sector += nsect;
969 rq->buffer += nsect<<9;
970 rq->errors = 0;
971 i = (rq->nr_sectors -= nsect);
972 if ((rq->current_nr_sectors -= nsect) <= 0)
973 ide_end_request(1, HWGROUP(drive));
974 if (i > 0) {
975 if (msect)
976 goto read_next;
977 ide_set_handler (drive, &read_intr, WAIT_CMD);
978 }
979 }
980
981 /*
982 * write_intr() is the handler for disk write interrupts
983 */
984 static void write_intr (ide_drive_t *drive)
/* */
985 {
986 byte stat;
987 int i;
988 ide_hwgroup_t *hwgroup = HWGROUP(drive);
989 struct request *rq = hwgroup->rq;
990
991 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
992 #ifdef DEBUG
993 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
994 drive->name, rq->sector, (unsigned long) rq->buffer,
995 rq->nr_sectors-1);
996 #endif
997 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
998 rq->sector++;
999 rq->buffer += 512;
1000 rq->errors = 0;
1001 i = --rq->nr_sectors;
1002 --rq->current_nr_sectors;
1003 if (rq->current_nr_sectors <= 0)
1004 ide_end_request(1, hwgroup);
1005 if (i > 0) {
1006 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1007 ide_set_handler (drive, &write_intr, WAIT_CMD);
1008 }
1009 return;
1010 }
1011 }
1012 ide_error(drive, "write_intr", stat);
1013 }
1014
1015 /*
1016 * ide_multwrite() transfers a block of up to mcount sectors of data
1017 * to a drive as part of a disk multiple-sector write operation.
1018 */
1019 void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
/* */
1020 {
1021 struct request *rq = &HWGROUP(drive)->wrq;
1022
1023 do {
1024 unsigned int nsect = rq->current_nr_sectors;
1025 if (nsect > mcount)
1026 nsect = mcount;
1027 mcount -= nsect;
1028
1029 ide_output_data(drive, rq->buffer, nsect<<7);
1030 #ifdef DEBUG
1031 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1032 drive->name, rq->sector, (unsigned long) rq->buffer,
1033 nsect, rq->nr_sectors - nsect);
1034 #endif
1035 if ((rq->nr_sectors -= nsect) <= 0)
1036 break;
1037 if ((rq->current_nr_sectors -= nsect) == 0) {
1038 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1039 rq->current_nr_sectors = rq->bh->b_size>>9;
1040 rq->buffer = rq->bh->b_data;
1041 } else {
1042 panic("%s: buffer list corrupted\n", drive->name);
1043 break;
1044 }
1045 } else {
1046 rq->buffer += nsect << 9;
1047 }
1048 } while (mcount);
1049 }
1050
1051 /*
1052 * multwrite_intr() is the handler for disk multwrite interrupts
1053 */
1054 static void multwrite_intr (ide_drive_t *drive)
/* */
1055 {
1056 byte stat;
1057 int i;
1058 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1059 struct request *rq = &hwgroup->wrq;
1060
1061 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1062 if (stat & DRQ_STAT) {
1063 if (rq->nr_sectors) {
1064 ide_multwrite(drive, drive->mult_count);
1065 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1066 return;
1067 }
1068 } else {
1069 if (!rq->nr_sectors) { /* all done? */
1070 rq = hwgroup->rq;
1071 for (i = rq->nr_sectors; i > 0;){
1072 i -= rq->current_nr_sectors;
1073 ide_end_request(1, hwgroup);
1074 }
1075 return;
1076 }
1077 }
1078 }
1079 ide_error(drive, "multwrite_intr", stat);
1080 }
1081
1082 /*
1083 * Issue a simple drive command
1084 * The drive must be selected beforehand.
1085 */
1086 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1087 {
1088 ide_set_handler (drive, handler, WAIT_CMD);
1089 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1090 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1091 OUT_BYTE(cmd,IDE_COMMAND_REG);
1092 }
1093
1094 /*
1095 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1096 */
1097 static void set_multmode_intr (ide_drive_t *drive)
/* */
1098 {
1099 byte stat = GET_STAT();
1100
1101 sti();
1102 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1103 drive->mult_count = drive->mult_req;
1104 } else {
1105 drive->mult_req = drive->mult_count = 0;
1106 drive->special.b.recalibrate = 1;
1107 (void) ide_dump_status(drive, "set_multmode", stat);
1108 }
1109 }
1110
1111 /*
1112 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1113 */
1114 static void set_geometry_intr (ide_drive_t *drive)
/* */
1115 {
1116 byte stat = GET_STAT();
1117
1118 sti();
1119 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1120 ide_error(drive, "set_geometry_intr", stat);
1121 }
1122
1123 /*
1124 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1125 */
1126 static void recal_intr (ide_drive_t *drive)
/* */
1127 {
1128 byte stat = GET_STAT();
1129
1130 sti();
1131 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1132 ide_error(drive, "recal_intr", stat);
1133 }
1134
1135 /*
1136 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1137 */
1138 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1139 {
1140 struct request *rq = HWGROUP(drive)->rq;
1141 byte *args = (byte *) rq->buffer;
1142 byte stat = GET_STAT();
1143
1144 sti();
1145 if ((stat & DRQ_STAT) && args && args[3]) {
1146 ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1147 stat = GET_STAT();
1148 }
1149 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1150 ide_end_drive_cmd (drive, stat, GET_ERR());
1151 else
1152 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1153 }
1154
1155 /*
1156 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1157 * commands to a drive. It used to do much more, but has been scaled back.
1158 */
1159 static inline void do_special (ide_drive_t *drive)
/* */
1160 {
1161 special_t *s = &drive->special;
1162 next:
1163 #ifdef DEBUG
1164 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1165 #endif
1166 if (s->b.set_geometry) {
1167 s->b.set_geometry = 0;
1168 if (drive->media == ide_disk) {
1169 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1170 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1171 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1172 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1173 if (!IS_PROMISE_DRIVE)
1174 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1175 }
1176 } else if (s->b.recalibrate) {
1177 s->b.recalibrate = 0;
1178 if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1179 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1180 } else if (s->b.set_pio) {
1181 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1182 s->b.set_pio = 0;
1183 if (tuneproc != NULL)
1184 tuneproc(drive, drive->pio_req);
1185 goto next;
1186 } else if (s->b.set_multmode) {
1187 s->b.set_multmode = 0;
1188 if (drive->media == ide_disk) {
1189 if (drive->id && drive->mult_req > drive->id->max_multsect)
1190 drive->mult_req = drive->id->max_multsect;
1191 if (!IS_PROMISE_DRIVE)
1192 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1193 } else
1194 drive->mult_req = 0;
1195 } else if (s->all) {
1196 int special = s->all;
1197 s->all = 0;
1198 printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1199 }
1200 }
1201
1202 /*
1203 * This routine busy-waits for the drive status to be not "busy".
1204 * It then checks the status for all of the "good" bits and none
1205 * of the "bad" bits, and if all is okay it returns 0. All other
1206 * cases return 1 after invoking ide_error() -- caller should just return.
1207 *
1208 * This routine should get fixed to not hog the cpu during extra long waits..
1209 * That could be done by busy-waiting for the first jiffy or two, and then
1210 * setting a timer to wake up at half second intervals thereafter,
1211 * until timeout is achieved, before timing out.
1212 */
1213 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1214 {
1215 byte stat;
1216 unsigned long flags;
1217
1218 test:
1219 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1220 if (OK_STAT((stat = GET_STAT()), good, bad))
1221 return 0; /* fast exit for most frequent case */
1222 if (!(stat & BUSY_STAT)) {
1223 ide_error(drive, "status error", stat);
1224 return 1;
1225 }
1226
1227 save_flags(flags);
1228 sti();
1229 timeout += jiffies;
1230 do {
1231 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1232 restore_flags(flags);
1233 goto test;
1234 }
1235 } while (jiffies <= timeout);
1236
1237 restore_flags(flags);
1238 ide_error(drive, "status timeout", GET_STAT());
1239 return 1;
1240 }
1241
1242 /*
1243 * do_rw_disk() issues READ and WRITE commands to a disk,
1244 * using LBA if supported, or CHS otherwise, to address sectors.
1245 * It also takes care of issuing special DRIVE_CMDs.
1246 */
1247 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1248 {
1249 ide_hwif_t *hwif = HWIF(drive);
1250 unsigned short io_base = hwif->io_base;
1251
1252 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1253 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1254 if (drive->select.b.lba) {
1255 #ifdef DEBUG
1256 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1257 drive->name, (rq->cmd==READ)?"read":"writ",
1258 block, rq->nr_sectors, (unsigned long) rq->buffer);
1259 #endif
1260 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1261 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1262 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1263 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1264 } else {
1265 unsigned int sect,head,cyl,track;
1266 track = block / drive->sect;
1267 sect = block % drive->sect + 1;
1268 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1269 head = track % drive->head;
1270 cyl = track / drive->head;
1271 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1272 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1273 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1274 #ifdef DEBUG
1275 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1276 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1277 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1278 #endif
1279 }
1280 #ifdef CONFIG_BLK_DEV_PROMISE
1281 if (IS_PROMISE_DRIVE) {
1282 if (hwif->is_promise2 || rq->cmd == READ) {
1283 do_promise_io (drive, rq);
1284 return;
1285 }
1286 }
1287 #endif /* CONFIG_BLK_DEV_PROMISE */
1288 if (rq->cmd == READ) {
1289 #ifdef CONFIG_BLK_DEV_TRITON
1290 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1291 return;
1292 #endif /* CONFIG_BLK_DEV_TRITON */
1293 ide_set_handler(drive, &read_intr, WAIT_CMD);
1294 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1295 return;
1296 }
1297 if (rq->cmd == WRITE) {
1298 #ifdef CONFIG_BLK_DEV_TRITON
1299 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1300 return;
1301 #endif /* CONFIG_BLK_DEV_TRITON */
1302 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1303 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1304 printk("%s: no DRQ after issuing %s\n", drive->name,
1305 drive->mult_count ? "MULTWRITE" : "WRITE");
1306 return;
1307 }
1308 if (!drive->unmask)
1309 cli();
1310 if (drive->mult_count) {
1311 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1312 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1313 ide_multwrite(drive, drive->mult_count);
1314 } else {
1315 ide_set_handler (drive, &write_intr, WAIT_CMD);
1316 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1317 }
1318 return;
1319 }
1320 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1321 ide_end_request(0, HWGROUP(drive));
1322 }
1323
1324 /*
1325 * execute_drive_cmd() issues a special drive command,
1326 * usually initiated by ioctl() from the external hdparm program.
1327 */
1328 static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
/* */
1329 {
1330 byte *args = rq->buffer;
1331 if (args) {
1332 #ifdef DEBUG
1333 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1334 drive->name, args[0], args[1], args[2], args[3]);
1335 #endif
1336 OUT_BYTE(args[2],IDE_FEATURE_REG);
1337 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1338 return;
1339 } else {
1340 /*
1341 * NULL is actually a valid way of waiting for
1342 * all current requests to be flushed from the queue.
1343 */
1344 #ifdef DEBUG
1345 printk("%s: DRIVE_CMD (null)\n", drive->name);
1346 #endif
1347 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1348 return;
1349 }
1350 }
1351
1352 /*
1353 * do_request() initiates handling of a new I/O request
1354 */
1355 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1356 {
1357 unsigned int minor, unit;
1358 unsigned long block, blockend;
1359 ide_drive_t *drive;
1360
1361 sti();
1362 #ifdef DEBUG
1363 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1364 #endif
1365 minor = MINOR(rq->rq_dev);
1366 unit = minor >> PARTN_BITS;
1367 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1368 printk("%s: bad device number: %s\n",
1369 hwif->name, kdevname(rq->rq_dev));
1370 goto kill_rq;
1371 }
1372 drive = &hwif->drives[unit];
1373 #ifdef DEBUG
1374 if (rq->bh && !buffer_locked(rq->bh)) {
1375 printk("%s: block not locked\n", drive->name);
1376 goto kill_rq;
1377 }
1378 #endif
1379 block = rq->sector;
1380 blockend = block + rq->nr_sectors;
1381 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1382 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1383 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1384 goto kill_rq;
1385 }
1386 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1387 #if FAKE_FDISK_FOR_EZDRIVE
1388 if (block == 0 && drive->remap_0_to_1)
1389 block = 1; /* redirect MBR access to EZ-Drive partn table */
1390 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1391 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1392 #if (DISK_RECOVERY_TIME > 0)
1393 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1394 #endif
1395
1396 #ifdef CONFIG_BLK_DEV_IDETAPE
1397 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1398 #endif /* CONFIG_BLK_DEV_IDETAPE */
1399
1400 SELECT_DRIVE(hwif,drive);
1401 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1402 printk("%s: drive not ready for command\n", drive->name);
1403 return;
1404 }
1405
1406 if (!drive->special.all) {
1407 if (rq->cmd == IDE_DRIVE_CMD) {
1408 execute_drive_cmd(drive, rq);
1409 return;
1410 }
1411 #ifdef CONFIG_BLK_DEV_IDEATAPI
1412 switch (drive->media) {
1413 case ide_disk:
1414 do_rw_disk (drive, rq, block);
1415 return;
1416 #ifdef CONFIG_BLK_DEV_IDECD
1417 case ide_cdrom:
1418 ide_do_rw_cdrom (drive, block);
1419 return;
1420 #endif /* CONFIG_BLK_DEV_IDECD */
1421 #ifdef CONFIG_BLK_DEV_IDETAPE
1422 case ide_tape:
1423 idetape_do_request (drive, rq, block);
1424 return;
1425 #endif /* CONFIG_BLK_DEV_IDETAPE */
1426
1427 default:
1428 printk("%s: media type %d not supported\n",
1429 drive->name, drive->media);
1430 goto kill_rq;
1431 }
1432 #else
1433 do_rw_disk (drive, rq, block); /* simpler and faster */
1434 return;
1435 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1436 }
1437 do_special(drive);
1438 return;
1439 kill_rq:
1440 ide_end_request(0, hwif->hwgroup);
1441 }
1442
1443 /*
1444 * The driver enables interrupts as much as possible. In order to do this,
1445 * (a) the device-interrupt is always masked before entry, and
1446 * (b) the timeout-interrupt is always disabled before entry.
1447 *
1448 * If we enter here from, say irq14, and then start a new request for irq15,
1449 * (possible with "serialize" option) then we cannot ensure that we exit
1450 * before the irq15 hits us. So, we must be careful not to let this bother us.
1451 *
1452 * Interrupts are still masked (by default) whenever we are exchanging
1453 * data/cmds with a drive, because some drives seem to have very poor
1454 * tolerance for latency during I/O. For devices which don't suffer from
1455 * this problem (most don't), the unmask flag can be set using the "hdparm"
1456 * utility, to permit other interrupts during data/cmd transfers.
1457 */
1458 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1459 {
1460 cli(); /* paranoia */
1461 if (hwgroup->handler != NULL) {
1462 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1463 return;
1464 }
1465 do {
1466 ide_hwif_t *hwif = hwgroup->hwif;
1467 struct request *rq;
1468 if ((rq = hwgroup->rq) == NULL) {
1469 /*
1470 * hwgroup->next_hwif is different from hwgroup->hwif
1471 * only when a request is inserted using "ide_next".
1472 * This saves wear and tear on IDE tapes.
1473 */
1474 hwif = hwgroup->next_hwif;
1475 do {
1476 rq = blk_dev[hwif->major].current_request;
1477 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1478 goto got_rq;
1479 } while ((hwif = hwif->next) != hwgroup->next_hwif);
1480 return; /* no work left for this hwgroup */
1481 }
1482 got_rq:
1483 do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1484 cli();
1485 } while (hwgroup->handler == NULL);
1486 }
1487
1488 /*
1489 * do_hwgroup_request() invokes ide_do_request() after first masking
1490 * all possible interrupts for the current hwgroup. This prevents race
1491 * conditions in the event that an unexpected interrupt occurs while
1492 * we are in the driver.
1493 *
1494 * Note that when an interrupt is used to reenter the driver, the first level
1495 * handler will already have masked the irq that triggered, but any other ones
1496 * for the hwgroup will still be unmasked. The driver tries to be careful
1497 * about such things.
1498 */
1499 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1500 {
1501 if (hwgroup->handler == NULL) {
1502 ide_hwif_t *hgif = hwgroup->hwif;
1503 ide_hwif_t *hwif = hgif;
1504 do {
1505 disable_irq(hwif->irq);
1506 } while ((hwif = hwif->next) != hgif);
1507 ide_do_request (hwgroup);
1508 do {
1509 enable_irq(hwif->irq);
1510 } while ((hwif = hwif->next) != hgif);
1511 }
1512 }
1513
1514 static void do_ide0_request (void) /* invoked with cli() */
/* */
1515 {
1516 do_hwgroup_request (ide_hwifs[0].hwgroup);
1517 }
1518
1519 #if MAX_HWIFS > 1
1520 static void do_ide1_request (void) /* invoked with cli() */
/* */
1521 {
1522 do_hwgroup_request (ide_hwifs[1].hwgroup);
1523 }
1524 #endif
1525
1526 #if MAX_HWIFS > 2
1527 static void do_ide2_request (void) /* invoked with cli() */
/* */
1528 {
1529 do_hwgroup_request (ide_hwifs[2].hwgroup);
1530 }
1531 #endif
1532
1533 #if MAX_HWIFS > 3
1534 static void do_ide3_request (void) /* invoked with cli() */
/* */
1535 {
1536 do_hwgroup_request (ide_hwifs[3].hwgroup);
1537 }
1538 #endif
1539
1540 static void timer_expiry (unsigned long data)
/* */
1541 {
1542 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1543 ide_drive_t *drive = hwgroup->drive;
1544 unsigned long flags;
1545
1546 save_flags(flags);
1547 cli();
1548
1549 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1550 ide_handler_t *handler = hwgroup->handler;
1551 hwgroup->handler = NULL;
1552 handler(drive);
1553 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1554 sti(); /* drive must have responded just as the timer expired */
1555 printk("%s: marginal timeout\n", drive->name);
1556 } else {
1557 hwgroup->handler = NULL; /* abort the operation */
1558 if (hwgroup->hwif->dmaproc)
1559 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1560 ide_error(drive, "irq timeout", GET_STAT());
1561 }
1562 if (hwgroup->handler == NULL)
1563 do_hwgroup_request (hwgroup);
1564 restore_flags(flags);
1565 }
1566
1567 /*
1568 * There's nothing really useful we can do with an unexpected interrupt,
1569 * other than reading the status register (to clear it), and logging it.
1570 * There should be no way that an irq can happen before we're ready for it,
1571 * so we needn't worry much about losing an "important" interrupt here.
1572 *
1573 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1574 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1575 * "good", we just ignore the interrupt completely.
1576 *
1577 * This routine assumes cli() is in effect when called.
1578 *
1579 * If an unexpected interrupt happens on irq15 while we are handling irq14
1580 * and if the two interfaces are "serialized" (CMD640), then it looks like
1581 * we could screw up by interfering with a new request being set up for irq15.
1582 *
1583 * In reality, this is a non-issue. The new command is not sent unless the
1584 * drive is ready to accept one, in which case we know the drive is not
1585 * trying to interrupt us. And ide_set_handler() is always invoked before
1586 * completing the issuance of any new drive command, so we will not be
1587 * accidently invoked as a result of any valid command completion interrupt.
1588 *
1589 */
1590 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1591 {
1592 byte stat;
1593 unsigned int unit;
1594 ide_hwif_t *hwif = hwgroup->hwif;
1595
1596 /*
1597 * handle the unexpected interrupt
1598 */
1599 do {
1600 if (hwif->irq == irq) {
1601 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1602 ide_drive_t *drive = &hwif->drives[unit];
1603 if (!drive->present)
1604 continue;
1605 SELECT_DRIVE(hwif,drive);
1606 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1607 (void) ide_dump_status(drive, "unexpected_intr", stat);
1608 if ((stat & DRQ_STAT))
1609 try_to_flush_leftover_data(drive);
1610 }
1611 }
1612 } while ((hwif = hwif->next) != hwgroup->hwif);
1613 SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1614 }
1615
1616 /*
1617 * entry point for all interrupts, caller does cli() for us
1618 */
1619 void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1620 {
1621 ide_hwgroup_t *hwgroup = dev_id;
1622 ide_handler_t *handler;
1623
1624 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1625 ide_drive_t *drive = hwgroup->drive;
1626 hwgroup->handler = NULL;
1627 del_timer(&(hwgroup->timer));
1628 if (drive->unmask)
1629 sti();
1630 handler(drive);
1631 cli(); /* this is necessary, as next rq may be different irq */
1632 if (hwgroup->handler == NULL) {
1633 SET_RECOVERY_TIMER(HWIF(drive));
1634 ide_do_request(hwgroup);
1635 }
1636 } else {
1637 unexpected_intr(irq, hwgroup);
1638 }
1639 cli();
1640 }
1641
1642 /*
1643 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1644 * It returns NULL if the given device number does not match any present drives.
1645 */
1646 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1647 {
1648 int major = MAJOR(i_rdev);
1649 unsigned int h;
1650
1651 for (h = 0; h < MAX_HWIFS; ++h) {
1652 ide_hwif_t *hwif = &ide_hwifs[h];
1653 if (hwif->present && major == hwif->major) {
1654 unsigned unit = DEVICE_NR(i_rdev);
1655 if (unit < MAX_DRIVES) {
1656 ide_drive_t *drive = &hwif->drives[unit];
1657 if (drive->present)
1658 return drive;
1659 } else if (major == IDE0_MAJOR && unit < 4) {
1660 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1661 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1662 }
1663 break;
1664 }
1665 }
1666 return NULL;
1667 }
1668
1669 /*
1670 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1671 */
1672 void ide_init_drive_cmd (struct request *rq)
/* */
1673 {
1674 rq->buffer = NULL;
1675 rq->cmd = IDE_DRIVE_CMD;
1676 rq->sector = 0;
1677 rq->nr_sectors = 0;
1678 rq->current_nr_sectors = 0;
1679 rq->sem = NULL;
1680 rq->bh = NULL;
1681 rq->bhtail = NULL;
1682 rq->next = NULL;
1683
1684 #if 0 /* these are done each time through ide_do_drive_cmd() */
1685 rq->errors = 0;
1686 rq->rq_status = RQ_ACTIVE;
1687 rq->rq_dev = ????;
1688 #endif
1689 }
1690
1691 /*
1692 * This function issues a special IDE device request
1693 * onto the request queue.
1694 *
1695 * If action is ide_wait, then then rq is queued at the end of
1696 * the request queue, and the function sleeps until it has been
1697 * processed. This is for use when invoked from an ioctl handler.
1698 *
1699 * If action is ide_preempt, then the rq is queued at the head of
1700 * the request queue, displacing the currently-being-processed
1701 * request and this function returns immediately without waiting
1702 * for the new rq to be completed. This is VERY DANGEROUS, and is
1703 * intended for careful use by the ATAPI tape/cdrom driver code.
1704 *
1705 * If action is ide_next, then the rq is queued immediately after
1706 * the currently-being-processed-request (if any), and the function
1707 * returns without waiting for the new rq to be completed. As above,
1708 * This is VERY DANGEROUS, and is intended for careful use by the
1709 * ATAPI tape/cdrom driver code.
1710 *
1711 * If action is ide_end, then the rq is queued at the end of the
1712 * request queue, and the function returns immediately without waiting
1713 * for the new rq to be completed. This is again intended for careful
1714 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1715 * when operating in the pipelined operation mode).
1716 */
1717 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1718 {
1719 unsigned long flags;
1720 unsigned int major = HWIF(drive)->major;
1721 struct request *cur_rq;
1722 struct blk_dev_struct *bdev = &blk_dev[major];
1723 struct semaphore sem = MUTEX_LOCKED;
1724
1725 if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1726 return -ENOSYS; /* special drive cmds not supported */
1727 rq->errors = 0;
1728 rq->rq_status = RQ_ACTIVE;
1729 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1730 if (action == ide_wait)
1731 rq->sem = &sem;
1732
1733 save_flags(flags);
1734 cli();
1735 if (action == ide_next)
1736 HWGROUP(drive)->next_hwif = HWIF(drive);
1737 cur_rq = bdev->current_request;
1738
1739 if (cur_rq == NULL || action == ide_preempt) {
1740 rq->next = cur_rq;
1741 bdev->current_request = rq;
1742 if (action == ide_preempt) {
1743 HWGROUP(drive)->rq = NULL;
1744 } else
1745 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1746 bdev->request_fn();
1747 cli();
1748 }
1749 } else {
1750 if (action == ide_wait || action == ide_end) {
1751 while (cur_rq->next != NULL) /* find end of list */
1752 cur_rq = cur_rq->next;
1753 }
1754 rq->next = cur_rq->next;
1755 cur_rq->next = rq;
1756 }
1757 if (action == ide_wait && rq->rq_status != RQ_INACTIVE) {
1758 run_task_queue(&tq_disk);
1759 down(&sem); /* wait for it to be serviced */
1760 }
1761 restore_flags(flags);
1762 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1763 }
1764
1765 static int ide_open(struct inode * inode, struct file * filp)
/* */
1766 {
1767 ide_drive_t *drive;
1768 unsigned long flags;
1769
1770 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1771 return -ENODEV;
1772 save_flags(flags);
1773 cli();
1774 while (drive->busy)
1775 sleep_on(&drive->wqueue);
1776 drive->usage++;
1777 restore_flags(flags);
1778 #ifdef CONFIG_BLK_DEV_IDECD
1779 if (drive->media == ide_cdrom)
1780 return ide_cdrom_open (inode, filp, drive);
1781 #endif /* CONFIG_BLK_DEV_IDECD */
1782 #ifdef CONFIG_BLK_DEV_IDETAPE
1783 if (drive->media == ide_tape)
1784 return idetape_blkdev_open (inode, filp, drive);
1785 #endif /* CONFIG_BLK_DEV_IDETAPE */
1786 if (drive->removeable) {
1787 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1788 struct request rq;
1789 check_disk_change(inode->i_rdev);
1790 ide_init_drive_cmd (&rq);
1791 rq.buffer = door_lock;
1792 /*
1793 * Ignore the return code from door_lock,
1794 * since the open() has already succeeded,
1795 * and the door_lock is irrelevant at this point.
1796 */
1797 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1798 }
1799 return 0;
1800 }
1801
1802 /*
1803 * Releasing a block device means we sync() it, so that it can safely
1804 * be forgotten about...
1805 */
1806 static void ide_release(struct inode * inode, struct file * file)
/* */
1807 {
1808 ide_drive_t *drive;
1809
1810 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1811 sync_dev(inode->i_rdev);
1812 drive->usage--;
1813 #ifdef CONFIG_BLK_DEV_IDECD
1814 if (drive->media == ide_cdrom) {
1815 ide_cdrom_release (inode, file, drive);
1816 return;
1817 }
1818 #endif /* CONFIG_BLK_DEV_IDECD */
1819 #ifdef CONFIG_BLK_DEV_IDETAPE
1820 if (drive->media == ide_tape) {
1821 idetape_blkdev_release (inode, file, drive);
1822 return;
1823 }
1824 #endif /* CONFIG_BLK_DEV_IDETAPE */
1825 if (drive->removeable) {
1826 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1827 struct request rq;
1828 invalidate_buffers(inode->i_rdev);
1829 ide_init_drive_cmd (&rq);
1830 rq.buffer = door_unlock;
1831 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1832 }
1833 }
1834 }
1835
1836 /*
1837 * This routine is called to flush all partitions and partition tables
1838 * for a changed disk, and then re-read the new partition table.
1839 * If we are revalidating a disk because of a media change, then we
1840 * enter with usage == 0. If we are using an ioctl, we automatically have
1841 * usage == 1 (we need an open channel to use an ioctl :-), so this
1842 * is our limit.
1843 */
1844 static int revalidate_disk(kdev_t i_rdev)
/* */
1845 {
1846 ide_drive_t *drive;
1847 unsigned int p, major, minor;
1848 long flags;
1849
1850 if ((drive = get_info_ptr(i_rdev)) == NULL)
1851 return -ENODEV;
1852
1853 major = MAJOR(i_rdev);
1854 minor = drive->select.b.unit << PARTN_BITS;
1855 save_flags(flags);
1856 cli();
1857 if (drive->busy || (drive->usage > 1)) {
1858 restore_flags(flags);
1859 return -EBUSY;
1860 };
1861 drive->busy = 1;
1862 restore_flags(flags);
1863
1864 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1865 if (drive->part[p].nr_sects > 0) {
1866 kdev_t devp = MKDEV(major, minor+p);
1867 sync_dev (devp);
1868 invalidate_inodes (devp);
1869 invalidate_buffers (devp);
1870 }
1871 drive->part[p].start_sect = 0;
1872 drive->part[p].nr_sects = 0;
1873 };
1874
1875 drive->part[0].nr_sects = current_capacity(drive);
1876 if (drive->media == ide_disk)
1877 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1878
1879 drive->busy = 0;
1880 wake_up(&drive->wqueue);
1881 return 0;
1882 }
1883
1884 static int write_fs_long (unsigned long useraddr, long value)
/* */
1885 {
1886 int err;
1887
1888 if (NULL == (long *)useraddr)
1889 return -EINVAL;
1890 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1891 return err;
1892 put_user((unsigned)value, (long *) useraddr);
1893 return 0;
1894 }
1895
1896 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1897 unsigned int cmd, unsigned long arg)
1898 {
1899 int err;
1900 ide_drive_t *drive;
1901 unsigned long flags;
1902 struct request rq;
1903
1904 if (!inode || !(inode->i_rdev))
1905 return -EINVAL;
1906 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1907 return -ENODEV;
1908 ide_init_drive_cmd (&rq);
1909 switch (cmd) {
1910 case HDIO_GETGEO:
1911 {
1912 struct hd_geometry *loc = (struct hd_geometry *) arg;
1913 if (!loc || drive->media != ide_disk) return -EINVAL;
1914 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1915 if (err) return err;
1916 put_user(drive->bios_head, (byte *) &loc->heads);
1917 put_user(drive->bios_sect, (byte *) &loc->sectors);
1918 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1919 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1920 (unsigned long *) &loc->start);
1921 return 0;
1922 }
1923 case BLKFLSBUF:
1924 if (!suser()) return -EACCES;
1925 fsync_dev(inode->i_rdev);
1926 invalidate_buffers(inode->i_rdev);
1927 return 0;
1928
1929 case BLKRASET:
1930 if (!suser()) return -EACCES;
1931 if(arg > 0xff) return -EINVAL;
1932 read_ahead[MAJOR(inode->i_rdev)] = arg;
1933 return 0;
1934
1935 case BLKRAGET:
1936 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1937
1938 case BLKGETSIZE: /* Return device size */
1939 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1940 case BLKRRPART: /* Re-read partition tables */
1941 if (!suser()) return -EACCES;
1942 return revalidate_disk(inode->i_rdev);
1943
1944 case HDIO_GET_KEEPSETTINGS:
1945 return write_fs_long(arg, drive->keep_settings);
1946
1947 case HDIO_GET_UNMASKINTR:
1948 return write_fs_long(arg, drive->unmask);
1949
1950 case HDIO_GET_DMA:
1951 return write_fs_long(arg, drive->using_dma);
1952
1953 case HDIO_GET_32BIT:
1954 return write_fs_long(arg, drive->io_32bit);
1955
1956 case HDIO_GET_MULTCOUNT:
1957 return write_fs_long(arg, drive->mult_count);
1958
1959 case HDIO_GET_IDENTITY:
1960 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1961 return -EINVAL;
1962 if (drive->id == NULL)
1963 return -ENOMSG;
1964 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1965 if (!err)
1966 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1967 return err;
1968
1969 case HDIO_GET_NOWERR:
1970 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1971
1972 case HDIO_SET_DMA:
1973 if (!suser()) return -EACCES;
1974 #ifdef CONFIG_BLK_DEV_IDECD
1975 if (drive->media == ide_cdrom)
1976 return -EPERM;
1977 #endif /* CONFIG_BLK_DEV_IDECD */
1978 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1979 return -EPERM;
1980 case HDIO_SET_KEEPSETTINGS:
1981 case HDIO_SET_UNMASKINTR:
1982 case HDIO_SET_NOWERR:
1983 if (arg > 1)
1984 return -EINVAL;
1985 case HDIO_SET_32BIT:
1986 if (!suser()) return -EACCES;
1987 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1988 return -EINVAL;
1989 save_flags(flags);
1990 cli();
1991 switch (cmd) {
1992 case HDIO_SET_DMA:
1993 if (!(HWIF(drive)->dmaproc)) {
1994 restore_flags(flags);
1995 return -EPERM;
1996 }
1997 drive->using_dma = arg;
1998 break;
1999 case HDIO_SET_KEEPSETTINGS:
2000 drive->keep_settings = arg;
2001 break;
2002 case HDIO_SET_UNMASKINTR:
2003 if (arg && HWIF(drive)->no_unmask) {
2004 restore_flags(flags);
2005 return -EPERM;
2006 }
2007 drive->unmask = arg;
2008 break;
2009 case HDIO_SET_NOWERR:
2010 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2011 break;
2012 case HDIO_SET_32BIT:
2013 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
2014 return -EINVAL;
2015 drive->io_32bit = arg;
2016 #ifdef CONFIG_BLK_DEV_DTC2278
2017 if (HWIF(drive)->chipset == ide_dtc2278)
2018 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2019 #endif /* CONFIG_BLK_DEV_DTC2278 */
2020 break;
2021 }
2022 restore_flags(flags);
2023 return 0;
2024
2025 case HDIO_SET_MULTCOUNT:
2026 if (!suser()) return -EACCES;
2027 if (MINOR(inode->i_rdev) & PARTN_MASK)
2028 return -EINVAL;
2029 if (drive->id && arg > drive->id->max_multsect)
2030 return -EINVAL;
2031 save_flags(flags);
2032 cli();
2033 if (drive->special.b.set_multmode) {
2034 restore_flags(flags);
2035 return -EBUSY;
2036 }
2037 drive->mult_req = arg;
2038 drive->special.b.set_multmode = 1;
2039 restore_flags(flags);
2040 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2041 return (drive->mult_count == arg) ? 0 : -EIO;
2042
2043 case HDIO_DRIVE_CMD:
2044 {
2045 byte args[4], *argbuf = args;
2046 int argsize = 4;
2047 if (!suser()) return -EACCES;
2048 if (NULL == (void *) arg) {
2049 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2050 } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2051 memcpy_fromfs(args, (void *)arg, 4);
2052 if (args[3]) {
2053 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2054 argbuf = kmalloc(argsize, GFP_KERNEL);
2055 if (argbuf == NULL)
2056 return -ENOMEM;
2057 argbuf[0] = args[0];
2058 argbuf[1] = args[1];
2059 argbuf[2] = args[2];
2060 argbuf[3] = args[3];
2061 }
2062 if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2063 rq.buffer = argbuf;
2064 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2065 memcpy_tofs((void *)arg, argbuf, argsize);
2066 }
2067 if (argsize > 4)
2068 kfree(argbuf);
2069 }
2070 return err;
2071 }
2072 case HDIO_SET_PIO_MODE:
2073 if (!suser()) return -EACCES;
2074 if (MINOR(inode->i_rdev) & PARTN_MASK)
2075 return -EINVAL;
2076 if (!HWIF(drive)->tuneproc)
2077 return -ENOSYS;
2078 save_flags(flags);
2079 cli();
2080 drive->pio_req = (int) arg;
2081 drive->special.b.set_pio = 1;
2082 restore_flags(flags);
2083 return 0;
2084
2085 RO_IOCTLS(inode->i_rdev, arg);
2086
2087 default:
2088 #ifdef CONFIG_BLK_DEV_IDECD
2089 if (drive->media == ide_cdrom)
2090 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2091 #endif /* CONFIG_BLK_DEV_IDECD */
2092 #ifdef CONFIG_BLK_DEV_IDETAPE
2093 if (drive->media == ide_tape)
2094 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2095 #endif /* CONFIG_BLK_DEV_IDETAPE */
2096 return -EPERM;
2097 }
2098 }
2099
2100 static int ide_check_media_change (kdev_t i_rdev)
/* */
2101 {
2102 ide_drive_t *drive;
2103
2104 if ((drive = get_info_ptr(i_rdev)) == NULL)
2105 return -ENODEV;
2106 #ifdef CONFIG_BLK_DEV_IDECD
2107 if (drive->media == ide_cdrom)
2108 return ide_cdrom_check_media_change (drive);
2109 #endif /* CONFIG_BLK_DEV_IDECD */
2110 if (drive->removeable) /* for disks */
2111 return 1; /* always assume it was changed */
2112 return 0;
2113 }
2114
2115 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2116 {
2117 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2118
2119 if (byteswap) {
2120 /* convert from big-endian to host byte order */
2121 for (p = end ; p != s;) {
2122 unsigned short *pp = (unsigned short *) (p -= 2);
2123 *pp = ntohs(*pp);
2124 }
2125 }
2126
2127 /* strip leading blanks */
2128 while (s != end && *s == ' ')
2129 ++s;
2130
2131 /* compress internal blanks and strip trailing blanks */
2132 while (s != end && *s) {
2133 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2134 *p++ = *(s-1);
2135 }
2136
2137 /* wipe out trailing garbage */
2138 while (p != end)
2139 *p++ = '\0';
2140 }
2141
2142 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2143 {
2144 int bswap;
2145 struct hd_driveid *id;
2146 unsigned long capacity, check;
2147
2148 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2149 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2150 sti();
2151
2152 /*
2153 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2154 */
2155 if ((id->model[0] == 'P' && id->model[1] == 'M')
2156 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2157 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2158 drive->present = 0;
2159 return;
2160 }
2161
2162 /*
2163 * WIN_IDENTIFY returns little-endian info,
2164 * WIN_PIDENTIFY *usually* returns little-endian info.
2165 */
2166 bswap = 1;
2167 if (cmd == WIN_PIDENTIFY) {
2168 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2169 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2170 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2171 bswap = 0; /* Vertos drives may still be weird */
2172 }
2173 ide_fixstring (id->model, sizeof(id->model), bswap);
2174 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2175 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2176
2177 #ifdef CONFIG_BLK_DEV_IDEATAPI
2178 /*
2179 * Check for an ATAPI device
2180 */
2181 if (cmd == WIN_PIDENTIFY) {
2182 byte type = (id->config >> 8) & 0x1f;
2183 printk("%s: %s, ATAPI ", drive->name, id->model);
2184 #ifdef CONFIG_BLK_DEV_PROMISE
2185 if (HWIF(drive)->is_promise2) {
2186 printk(" -- not supported on 2nd Promise port\n");
2187 drive->present = 0;
2188 return;
2189 }
2190 #endif /* CONFIG_BLK_DEV_PROMISE */
2191 switch (type) {
2192 case 0: /* Early cdrom models used zero */
2193 case 5:
2194 #ifdef CONFIG_BLK_DEV_IDECD
2195 printk ("CDROM drive\n");
2196 drive->media = ide_cdrom;
2197 drive->present = 1;
2198 drive->removeable = 1;
2199 return;
2200 #else
2201 printk ("CDROM ");
2202 break;
2203 #endif /* CONFIG_BLK_DEV_IDECD */
2204 case 1:
2205 #ifdef CONFIG_BLK_DEV_IDETAPE
2206 printk ("TAPE drive");
2207 if (idetape_identify_device (drive,id)) {
2208 drive->media = ide_tape;
2209 drive->present = 1;
2210 drive->removeable = 1;
2211 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2212 if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
2213 printk(", DMA");
2214 }
2215 printk("\n");
2216 }
2217 else {
2218 drive->present = 0;
2219 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2220 }
2221 return;
2222 #else
2223 printk ("TAPE ");
2224 break;
2225 #endif /* CONFIG_BLK_DEV_IDETAPE */
2226 default:
2227 drive->present = 0;
2228 printk("Type %d - Unknown device\n", type);
2229 return;
2230 }
2231 drive->present = 0;
2232 printk("- not supported by this kernel\n");
2233 return;
2234 }
2235 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2236
2237 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2238 if (id->config & (1<<7)) { /* removeable disk ? */
2239 if (id->model[0] != 'W' || id->model[1] != 'D')
2240 drive->removeable = 1;
2241 }
2242
2243 /* SunDisk drives: treat as non-removeable, force one unit */
2244 if (id->model[0] == 'S' && id->model[1] == 'u') {
2245 drive->removeable = 0;
2246 if (drive->select.all & (1<<4)) {
2247 drive->present = 0;
2248 return;
2249 }
2250 }
2251
2252 drive->media = ide_disk;
2253 /* Extract geometry if we did not already have one for the drive */
2254 if (!drive->present) {
2255 drive->present = 1;
2256 drive->cyl = drive->bios_cyl = id->cyls;
2257 drive->head = drive->bios_head = id->heads;
2258 drive->sect = drive->bios_sect = id->sectors;
2259 }
2260 /* Handle logical geometry translation by the drive */
2261 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2262 && (id->cur_heads <= 16) && id->cur_sectors)
2263 {
2264 /*
2265 * Extract the physical drive geometry for our use.
2266 * Note that we purposely do *not* update the bios info.
2267 * This way, programs that use it (like fdisk) will
2268 * still have the same logical view as the BIOS does,
2269 * which keeps the partition table from being screwed.
2270 *
2271 * An exception to this is the cylinder count,
2272 * which we reexamine later on to correct for 1024 limitations.
2273 */
2274 drive->cyl = id->cur_cyls;
2275 drive->head = id->cur_heads;
2276 drive->sect = id->cur_sectors;
2277
2278 /* check for word-swapped "capacity" field in id information */
2279 capacity = drive->cyl * drive->head * drive->sect;
2280 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2281 if (check == capacity) { /* was it swapped? */
2282 /* yes, bring it into little-endian order: */
2283 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2284 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2285 }
2286 }
2287 /* Use physical geometry if what we have still makes no sense */
2288 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2289 drive->cyl = id->cyls;
2290 drive->head = id->heads;
2291 drive->sect = id->sectors;
2292 }
2293 /* Correct the number of cyls if the bios value is too small */
2294 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2295 if (drive->cyl > drive->bios_cyl)
2296 drive->bios_cyl = drive->cyl;
2297 }
2298
2299 (void) current_capacity (drive); /* initialize LBA selection */
2300
2301 printk ("%s: %.40s, %ldMB w/%dkB Cache, %sCHS=%d/%d/%d",
2302 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2303 drive->select.b.lba ? "LBA, " : "",
2304 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2305
2306 drive->mult_count = 0;
2307 if (id->max_multsect) {
2308 drive->mult_req = INITIAL_MULT_COUNT;
2309 if (drive->mult_req > id->max_multsect)
2310 drive->mult_req = id->max_multsect;
2311 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2312 drive->special.b.set_multmode = 1;
2313 }
2314 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2315 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2316 printk(", DMA");
2317 }
2318 printk("\n");
2319 }
2320
2321 /*
2322 * Delay for *at least* 10ms. As we don't know how much time is left
2323 * until the next tick occurs, we wait an extra tick to be safe.
2324 * This is used only during the probing/polling for drives at boot time.
2325 */
2326 static void delay_10ms (void)
/* */
2327 {
2328 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2329 while (timer > jiffies);
2330 }
2331
2332 /*
2333 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2334 * and waits for a response. It also monitors irqs while this is
2335 * happening, in hope of automatically determining which one is
2336 * being used by the interface.
2337 *
2338 * Returns: 0 device was identified
2339 * 1 device timed-out (no response to identify request)
2340 * 2 device aborted the command (refused to identify itself)
2341 */
2342 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2343 {
2344 int hd_status, rc;
2345 unsigned long timeout;
2346 int irqs = 0;
2347
2348 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2349 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2350 irqs = probe_irq_on(); /* start monitoring irqs */
2351 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2352 }
2353
2354 delay_10ms(); /* take a deep breath */
2355 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2356 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2357 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2358 } else
2359 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2360
2361 #if CONFIG_BLK_DEV_PROMISE
2362 if (IS_PROMISE_DRIVE) {
2363 if(promise_cmd(drive,PROMISE_IDENTIFY))
2364 return 1;
2365 } else
2366 #endif /* CONFIG_BLK_DEV_PROMISE */
2367 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2368 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2369 timeout += jiffies;
2370 do {
2371 if (jiffies > timeout) {
2372 if (!HWIF(drive)->irq)
2373 (void) probe_irq_off(irqs);
2374 return 1; /* drive timed-out */
2375 }
2376 delay_10ms(); /* give drive a breather */
2377 } while (IN_BYTE(hd_status) & BUSY_STAT);
2378
2379 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2380 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2381 unsigned long flags;
2382 save_flags(flags);
2383 cli(); /* some systems need this */
2384 do_identify(drive, cmd); /* drive returned ID */
2385 if (drive->present && drive->media != ide_tape) {
2386 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2387 if (tuneproc != NULL && drive->autotune == 1)
2388 tuneproc(drive, 255); /* auto-tune PIO mode */
2389 }
2390 rc = 0; /* drive responded with ID */
2391 (void) GET_STAT(); /* clear drive IRQ */
2392 restore_flags(flags);
2393 } else
2394 rc = 2; /* drive refused ID */
2395 if (!HWIF(drive)->irq) {
2396 irqs = probe_irq_off(irqs); /* get irq number */
2397 if (irqs > 0)
2398 HWIF(drive)->irq = irqs;
2399 else /* Mmmm.. multiple IRQs */
2400 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2401 }
2402 return rc;
2403 }
2404
2405 /*
2406 * do_probe() has the difficult job of finding a drive if it exists,
2407 * without getting hung up if it doesn't exist, without trampling on
2408 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2409 *
2410 * If a drive is "known" to exist (from CMOS or kernel parameters),
2411 * but does not respond right away, the probe will "hang in there"
2412 * for the maximum wait time (about 30 seconds), otherwise it will
2413 * exit much more quickly.
2414 *
2415 * Returns: 0 device was identified
2416 * 1 device timed-out (no response to identify request)
2417 * 2 device aborted the command (refused to identify itself)
2418 * 3 bad status from device (possible for ATAPI drives)
2419 * 4 probe was not attempted because failure was obvious
2420 */
2421 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2422 {
2423 int rc;
2424 ide_hwif_t *hwif;
2425 #ifdef CONFIG_BLK_DEV_IDEATAPI
2426 if (drive->present) { /* avoid waiting for inappropriate probes */
2427 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2428 return 4;
2429 }
2430 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2431 #ifdef DEBUG
2432 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2433 drive->name, drive->present, drive->media,
2434 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2435 #endif
2436 hwif = HWIF(drive);
2437 SELECT_DRIVE(hwif,drive);
2438 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2439 delay_10ms(); /* wait for BUSY_STAT */
2440 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2441 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2442 return 3; /* no i/f present: avoid killing ethernet cards */
2443 }
2444
2445 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2446 || drive->present || cmd == WIN_PIDENTIFY)
2447 {
2448 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2449 rc = try_to_identify(drive,cmd); /* failed: try again */
2450 if (rc == 1)
2451 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2452 (void) GET_STAT(); /* ensure drive irq is clear */
2453 } else {
2454 rc = 3; /* not present or maybe ATAPI */
2455 }
2456 if (drive->select.b.unit != 0) {
2457 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2458 delay_10ms();
2459 (void) GET_STAT(); /* ensure drive irq is clear */
2460 }
2461 return rc;
2462 }
2463
2464 /*
2465 * probe_for_drive() tests for existance of a given drive using do_probe().
2466 *
2467 * Returns: 0 no device was found
2468 * 1 device was found (note: drive->present might still be 0)
2469 */
2470 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2471 {
2472 if (drive->noprobe) /* skip probing? */
2473 return drive->present;
2474 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2475 #ifdef CONFIG_BLK_DEV_IDEATAPI
2476 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2477 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2478 }
2479 if (!drive->present)
2480 return 0; /* drive not found */
2481 if (drive->id == NULL) { /* identification failed? */
2482 if (drive->media == ide_disk) {
2483 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2484 drive->name, drive->cyl, drive->head, drive->sect);
2485 }
2486 #ifdef CONFIG_BLK_DEV_IDECD
2487 else if (drive->media == ide_cdrom) {
2488 printk("%s: ATAPI cdrom (?)\n", drive->name);
2489 }
2490 #endif /* CONFIG_BLK_DEV_IDECD */
2491 else {
2492 drive->present = 0; /* nuke it */
2493 }
2494 }
2495 return 1; /* drive was found */
2496 }
2497
2498 /*
2499 * This routine only knows how to look for drive units 0 and 1
2500 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2501 */
2502 static void probe_hwif (ide_hwif_t *hwif)
/* */
2503 {
2504 unsigned int unit;
2505
2506 #if CONFIG_BLK_DEV_PROMISE
2507 if (!hwif->is_promise2 &&
2508 (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2509 #else
2510 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2511 #endif /* CONFIG_BLK_DEV_PROMISE */
2512 int msgout = 0;
2513 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2514 ide_drive_t *drive = &hwif->drives[unit];
2515 if (drive->present) {
2516 drive->present = 0;
2517 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2518 msgout = 1;
2519 }
2520 }
2521 if (!msgout)
2522 printk("%s: ports already in use, skipping probe\n", hwif->name);
2523 } else {
2524 unsigned long flags;
2525 save_flags(flags);
2526
2527 sti(); /* needed for jiffies and irq probing */
2528 /*
2529 * Second drive should only exist if first drive was found,
2530 * but a lot of cdrom drives are configured as single slaves.
2531 */
2532 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2533 ide_drive_t *drive = &hwif->drives[unit];
2534 (void) probe_for_drive (drive);
2535 if (drive->present && drive->media == ide_disk) {
2536 if (IS_PROMISE_DRIVE)
2537 drive->select.b.lba = 1; /* required by promise driver */
2538 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2539 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2540 drive->name, drive->head);
2541 drive->present = 0;
2542 }
2543 }
2544 if (drive->present && !hwif->present) {
2545 hwif->present = 1;
2546 request_region(hwif->io_base, 8, hwif->name);
2547 request_region(hwif->ctl_port, 1, hwif->name);
2548 }
2549 }
2550 restore_flags(flags);
2551 }
2552 }
2553
2554 /*
2555 * stridx() returns the offset of c within s,
2556 * or -1 if c is '\0' or not found within s.
2557 */
2558 static int stridx (const char *s, char c)
/* */
2559 {
2560 char *i = strchr(s, c);
2561 return (i && c) ? i - s : -1;
2562 }
2563
2564 /*
2565 * match_parm() does parsing for ide_setup():
2566 *
2567 * 1. the first char of s must be '='.
2568 * 2. if the remainder matches one of the supplied keywords,
2569 * the index (1 based) of the keyword is negated and returned.
2570 * 3. if the remainder is a series of no more than max_vals numbers
2571 * separated by commas, the numbers are saved in vals[] and a
2572 * count of how many were saved is returned. Base10 is assumed,
2573 * and base16 is allowed when prefixed with "0x".
2574 * 4. otherwise, zero is returned.
2575 */
2576 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2577 {
2578 static const char *decimal = "0123456789";
2579 static const char *hex = "0123456789abcdef";
2580 int i, n;
2581
2582 if (*s++ == '=') {
2583 /*
2584 * Try matching against the supplied keywords,
2585 * and return -(index+1) if we match one
2586 */
2587 for (i = 0; *keywords != NULL; ++i) {
2588 if (!strcmp(s, *keywords++))
2589 return -(i+1);
2590 }
2591 /*
2592 * Look for a series of no more than "max_vals"
2593 * numeric values separated by commas, in base10,
2594 * or base16 when prefixed with "0x".
2595 * Return a count of how many were found.
2596 */
2597 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2598 vals[n] = i;
2599 while ((i = stridx(decimal, *++s)) >= 0)
2600 vals[n] = (vals[n] * 10) + i;
2601 if (*s == 'x' && !vals[n]) {
2602 while ((i = stridx(hex, *++s)) >= 0)
2603 vals[n] = (vals[n] * 0x10) + i;
2604 }
2605 if (++n == max_vals)
2606 break;
2607 if (*s == ',')
2608 ++s;
2609 }
2610 if (!*s)
2611 return n;
2612 }
2613 return 0; /* zero = nothing matched */
2614 }
2615
2616 /*
2617 * ide_setup() gets called VERY EARLY during initialization,
2618 * to handle kernel "command line" strings beginning with "hdx="
2619 * or "ide". Here is the complete set currently supported:
2620 *
2621 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2622 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2623 *
2624 * "hdx=noprobe" : drive may be present, but do not probe for it
2625 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2626 * "hdx=cdrom" : drive is present, and is a cdrom drive
2627 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2628 * "hdx=autotune" : driver will attempt to tune interface speed
2629 * to the fastest PIO mode supported,
2630 * if possible for this drive only.
2631 * Not fully supported by all chipset types,
2632 * and quite likely to cause trouble with
2633 * older/odd IDE drives.
2634 *
2635 * "idex=noprobe" : do not attempt to access/use this interface
2636 * "idex=base" : probe for an interface at the addr specified,
2637 * where "base" is usually 0x1f0 or 0x170
2638 * and "ctl" is assumed to be "base"+0x206
2639 * "idex=base,ctl" : specify both base and ctl
2640 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2641 * "idex=autotune" : driver will attempt to tune interface speed
2642 * to the fastest PIO mode supported,
2643 * for all drives on this interface.
2644 * Not fully supported by all chipset types,
2645 * and quite likely to cause trouble with
2646 * older/odd IDE drives.
2647 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2648 * This is the default for most chipsets,
2649 * except the cmd640.
2650 * "idex=serialize" : do not overlap operations on idex and ide(x^1)
2651 *
2652 * The following are valid ONLY on ide0,
2653 * and the defaults for the base,ctl ports must not be altered.
2654 *
2655 * "ide0=dtc2278" : probe/support DTC2278 interface
2656 * "ide0=ht6560b" : probe/support HT6560B interface
2657 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2658 * (not for PCI -- automatically detected)
2659 * "ide0=qd6580" : probe/support qd6580 interface
2660 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2661 * "ide0=umc8672" : probe/support umc8672 chipsets
2662 */
2663 void ide_setup (char *s)
/* */
2664 {
2665 int i, vals[3];
2666 ide_hwif_t *hwif;
2667 ide_drive_t *drive;
2668 unsigned int hw, unit;
2669 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2670 const char max_hwif = '0' + (MAX_HWIFS - 1);
2671
2672 printk("ide_setup: %s", s);
2673 init_ide_data ();
2674
2675 /*
2676 * Look for drive options: "hdx="
2677 */
2678 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2679 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2680 "autotune", "noautotune", NULL};
2681 unit = s[2] - 'a';
2682 hw = unit / MAX_DRIVES;
2683 unit = unit % MAX_DRIVES;
2684 hwif = &ide_hwifs[hw];
2685 drive = &hwif->drives[unit];
2686 switch (match_parm(&s[3], hd_words, vals, 3)) {
2687 case -1: /* "noprobe" */
2688 drive->noprobe = 1;
2689 goto done;
2690 case -2: /* "nowerr" */
2691 drive->bad_wstat = BAD_R_STAT;
2692 hwif->noprobe = 0;
2693 goto done;
2694 case -3: /* "cdrom" */
2695 drive->present = 1;
2696 drive->media = ide_cdrom;
2697 hwif->noprobe = 0;
2698 goto done;
2699 case -4: /* "serialize" */
2700 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
2701 goto do_serialize;
2702 case -5: /* "autotune" */
2703 drive->autotune = 1;
2704 goto done;
2705 case -6: /* "noautotune" */
2706 drive->autotune = 2;
2707 goto done;
2708 case 3: /* cyl,head,sect */
2709 drive->media = ide_disk;
2710 drive->cyl = drive->bios_cyl = vals[0];
2711 drive->head = drive->bios_head = vals[1];
2712 drive->sect = drive->bios_sect = vals[2];
2713 drive->present = 1;
2714 drive->forced_geom = 1;
2715 hwif->noprobe = 0;
2716 goto done;
2717 default:
2718 goto bad_option;
2719 }
2720 }
2721 /*
2722 * Look for interface options: "idex="
2723 */
2724 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2725 /*
2726 * Be VERY CAREFUL changing this: note hardcoded indexes below
2727 */
2728 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2729 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
2730 hw = s[3] - '0';
2731 hwif = &ide_hwifs[hw];
2732 i = match_parm(&s[4], ide_words, vals, 3);
2733
2734 /*
2735 * Cryptic check to ensure chipset not already set for hwif:
2736 */
2737 if (i != -1 && i != -2) {
2738 if (hwif->chipset != ide_unknown)
2739 goto bad_option;
2740 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2741 goto bad_option;
2742 }
2743 /*
2744 * Interface keywords work only for ide0:
2745 */
2746 if (i <= -6 && hw != 0)
2747 goto bad_hwif;
2748
2749 switch (i) {
2750 #ifdef CONFIG_BLK_DEV_PROMISE
2751 case -11: /* "dc4030" */
2752 {
2753 setup_dc4030(hwif);
2754 goto done;
2755 }
2756 #endif /* CONFIG_BLK_DEV_PROMISE */
2757 #ifdef CONFIG_BLK_DEV_ALI14XX
2758 case -10: /* "ali14xx" */
2759 {
2760 extern void init_ali14xx (void);
2761 init_ali14xx();
2762 goto done;
2763 }
2764 #endif /* CONFIG_BLK_DEV_ALI14XX */
2765 #ifdef CONFIG_BLK_DEV_UMC8672
2766 case -9: /* "umc8672" */
2767 {
2768 extern void init_umc8672 (void);
2769 init_umc8672();
2770 goto done;
2771 }
2772 #endif /* CONFIG_BLK_DEV_UMC8672 */
2773 #ifdef CONFIG_BLK_DEV_DTC2278
2774 case -8: /* "dtc2278" */
2775 {
2776 extern void init_dtc2278 (void);
2777 init_dtc2278();
2778 goto done;
2779 }
2780 #endif /* CONFIG_BLK_DEV_DTC2278 */
2781 #ifdef CONFIG_BLK_DEV_CMD640
2782 case -7: /* "cmd640_vlb" */
2783 {
2784 extern int cmd640_vlb; /* flag for cmd640.c */
2785 cmd640_vlb = 1;
2786 goto done;
2787 }
2788 #endif /* CONFIG_BLK_DEV_CMD640 */
2789 #ifdef CONFIG_BLK_DEV_HT6560B
2790 case -6: /* "ht6560b" */
2791 {
2792 extern void init_ht6560b (void);
2793 init_ht6560b();
2794 goto done;
2795 }
2796 #endif /* CONFIG_BLK_DEV_HT6560B */
2797 #if CONFIG_BLK_DEV_QD6580
2798 case -5: /* "qd6580" (no secondary i/f) */
2799 {
2800 extern void init_qd6580 (void);
2801 init_qd6580();
2802 goto done;
2803 }
2804 #endif /* CONFIG_BLK_DEV_QD6580 */
2805 case -4: /* "noautotune" */
2806 hwif->drives[0].autotune = 2;
2807 hwif->drives[1].autotune = 2;
2808 goto done;
2809 case -3: /* "autotune" */
2810 hwif->drives[0].autotune = 1;
2811 hwif->drives[1].autotune = 1;
2812 goto done;
2813 case -2: /* "serialize" */
2814 do_serialize:
2815 ide_hwifs[hw].serialized = 1; /* serialize */
2816 ide_hwifs[hw^1].serialized = 1; /* with mate */
2817 goto done;
2818
2819 case -1: /* "noprobe" */
2820 hwif->noprobe = 1;
2821 goto done;
2822
2823 case 1: /* base */
2824 vals[1] = vals[0] + 0x206; /* default ctl */
2825 case 2: /* base,ctl */
2826 vals[2] = 0; /* default irq = probe for it */
2827 case 3: /* base,ctl,irq */
2828 hwif->io_base = vals[0];
2829 hwif->ctl_port = vals[1];
2830 hwif->irq = vals[2];
2831 hwif->noprobe = 0;
2832 hwif->chipset = ide_generic;
2833 goto done;
2834
2835 case 0: goto bad_option;
2836 default:
2837 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2838 return;
2839 }
2840 }
2841 bad_option:
2842 printk(" -- BAD OPTION\n");
2843 return;
2844 bad_hwif:
2845 printk("-- NOT SUPPORTED ON ide%d", hw);
2846 done:
2847 printk("\n");
2848 }
2849
2850 /*
2851 * This routine is called from the partition-table code in genhd.c
2852 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2853 *
2854 * The second parameter, "xparm", determines exactly how the translation
2855 * will be handled:
2856 * 0 = convert to CHS with fewer than 1024 cyls
2857 * using the same method as Ontrack DiskManager.
2858 * 1 = same as "0", plus offset everything by 63 sectors.
2859 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2860 * >1 = convert to a CHS geometry with "xparm" heads.
2861 *
2862 * Returns 0 if the translation was not possible, if the device was not
2863 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2864 * Returns 1 if the geometry translation was successful.
2865 */
2866 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2867 {
2868 ide_drive_t *drive;
2869 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2870 const byte *heads = head_vals;
2871 unsigned long tracks;
2872
2873 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2874 return 0;
2875
2876 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2877 return 0; /* we already have a translation */
2878
2879 printk("%s ", msg);
2880
2881 if (drive->id) {
2882 drive->cyl = drive->id->cyls;
2883 drive->head = drive->id->heads;
2884 drive->sect = drive->id->sectors;
2885 }
2886 drive->bios_cyl = drive->cyl;
2887 drive->bios_head = drive->head;
2888 drive->bios_sect = drive->sect;
2889 drive->special.b.set_geometry = 1;
2890
2891 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2892 drive->bios_sect = 63;
2893 if (xparm > 1) {
2894 drive->bios_head = xparm;
2895 drive->bios_cyl = tracks / drive->bios_head;
2896 } else {
2897 while (drive->bios_cyl >= 1024) {
2898 drive->bios_head = *heads;
2899 drive->bios_cyl = tracks / drive->bios_head;
2900 if (0 == *++heads)
2901 break;
2902 }
2903 #if FAKE_FDISK_FOR_EZDRIVE
2904 if (xparm == -1) {
2905 drive->remap_0_to_1 = 1;
2906 msg = "0->1";
2907 } else
2908 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2909 if (xparm == 1) {
2910 drive->sect0 = 63;
2911 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2912 msg = "+63";
2913 }
2914 printk("[remap %s] ", msg);
2915 }
2916 drive->part[0].nr_sects = current_capacity(drive);
2917 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2918 return 1;
2919 }
2920
2921 /*
2922 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2923 * controller that is BIOS compatible with ST-506, and thus showing up in our
2924 * BIOS table, but not register compatible, and therefore not present in CMOS.
2925 *
2926 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2927 * drives in the system -- the ones reflected as drive 1 or 2. The first
2928 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2929 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2930 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2931 * means we have an AT controller hard disk for that drive.
2932 *
2933 * Of course, there is no guarantee that either drive is actually on the
2934 * "primary" IDE interface, but we don't bother trying to sort that out here.
2935 * If a drive is not actually on the primary interface, then these parameters
2936 * will be ignored. This results in the user having to supply the logical
2937 * drive geometry as a boot parameter for each drive not on the primary i/f.
2938 *
2939 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2940 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2941 * for us during initialization. I have the necessary docs -- any takers? -ml
2942 */
2943
2944 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2945 {
2946 #ifdef __i386__
2947 extern struct drive_info_struct drive_info;
2948 byte cmos_disks, *BIOS = (byte *) &drive_info;
2949 int unit;
2950
2951 #ifdef CONFIG_BLK_DEV_PROMISE
2952 if (hwif->is_promise2)
2953 return;
2954 #endif /* CONFIG_BLK_DEV_PROMISE */
2955 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2956 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2957 /* Extract drive geometry from CMOS+BIOS if not already setup */
2958 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2959 ide_drive_t *drive = &hwif->drives[unit];
2960 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2961 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2962 drive->head = drive->bios_head = *(BIOS+2);
2963 drive->sect = drive->bios_sect = *(BIOS+14);
2964 drive->ctl = *(BIOS+8);
2965 drive->present = 1;
2966 }
2967 BIOS += 16;
2968 }
2969 #endif
2970 }
2971
2972 /*
2973 * This routine sets up the irq for an ide interface, and creates a new
2974 * hwgroup for the irq/hwif if none was previously assigned.
2975 *
2976 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2977 * interrupts completely disabled. This can be bad for interrupt latency,
2978 * but anything else has led to problems on some machines. We re-enable
2979 * interrupts as much as we can safely do in most places.
2980 */
2981 static int init_irq (ide_hwif_t *hwif)
/* */
2982 {
2983 unsigned long flags;
2984 ide_hwgroup_t *hwgroup = hwif->hwgroup;
2985 ide_hwif_t *mate_hwif;
2986 unsigned int index, mate_irq = hwif->irq;
2987
2988 save_flags(flags);
2989 cli();
2990
2991 /*
2992 * Handle serialization, regardless of init sequence
2993 */
2994 mate_hwif = &ide_hwifs[hwif->index ^ 1];
2995 if (hwif->serialized && mate_hwif->present)
2996 mate_irq = mate_hwif->irq;
2997
2998 /*
2999 * Group up with any other hwifs that share our irq(s)
3000 */
3001 for (index = 0; index < MAX_HWIFS; index++) {
3002 if (index != hwif->index) {
3003 ide_hwif_t *g = &ide_hwifs[index];
3004 if (g->irq == hwif->irq || g->irq == mate_irq) {
3005 if (hwgroup && !g->hwgroup)
3006 g->hwgroup = hwgroup;
3007 else if (!hwgroup)
3008 hwgroup = g->hwgroup;
3009 }
3010 }
3011 }
3012
3013 /*
3014 * If we are still without a hwgroup, then form a new one
3015 */
3016 if (hwgroup == NULL) {
3017 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
3018 hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3019 hwgroup->rq = NULL;
3020 hwgroup->handler = NULL;
3021 if (hwif->drives[0].present)
3022 hwgroup->drive = &hwif->drives[0];
3023 else
3024 hwgroup->drive = &hwif->drives[1];
3025 hwgroup->poll_timeout = 0;
3026 init_timer(&hwgroup->timer);
3027 hwgroup->timer.function = &timer_expiry;
3028 hwgroup->timer.data = (unsigned long) hwgroup;
3029 }
3030
3031 /*
3032 * Allocate the irq, if not already obtained for another hwif
3033 */
3034 if (!hwif->got_irq) {
3035 if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, hwgroup)) {
3036 restore_flags(flags);
3037 return 1;
3038 }
3039 for (index = 0; index < MAX_HWIFS; index++) {
3040 ide_hwif_t *g = &ide_hwifs[index];
3041 if (g->irq == hwif->irq)
3042 g->got_irq = 1;
3043 }
3044 }
3045
3046 /*
3047 * Everything is okay, so link us into the hwgroup
3048 */
3049 hwif->hwgroup = hwgroup;
3050 hwif->next = hwgroup->hwif->next;
3051 hwgroup->hwif->next = hwif;
3052
3053 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3054
3055 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3056 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3057 if (hwgroup->hwif != hwif)
3058 printk(" (serialized with %s)", hwgroup->hwif->name);
3059 printk("\n");
3060 return 0;
3061 }
3062
3063 static struct file_operations ide_fops = {
3064 NULL, /* lseek - default */
3065 block_read, /* read - general block-dev read */
3066 block_write, /* write - general block-dev write */
3067 NULL, /* readdir - bad */
3068 NULL, /* select */
3069 ide_ioctl, /* ioctl */
3070 NULL, /* mmap */
3071 ide_open, /* open */
3072 ide_release, /* release */
3073 block_fsync /* fsync */
3074 ,NULL, /* fasync */
3075 ide_check_media_change, /* check_media_change */
3076 revalidate_disk /* revalidate */
3077 };
3078
3079 #ifdef CONFIG_PCI
3080 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3081
3082 typedef void (ide_pci_init_proc_t)(byte, byte);
3083
3084 /*
3085 * ide_probe_pci() scans PCI for a specific vendor/device function,
3086 * and invokes the supplied init routine for each instance detected.
3087 */
3088 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
3089 {
3090 unsigned long flags;
3091 unsigned index;
3092 byte fn, bus;
3093
3094 save_flags(flags);
3095 cli();
3096 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3097 init (bus, fn + func_adj);
3098 }
3099 restore_flags(flags);
3100 }
3101
3102 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3103 #endif /* CONFIG_PCI */
3104
3105 /*
3106 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3107 *
3108 * This routine should ideally be using pcibios_find_class() to find
3109 * all IDE interfaces, but that function causes some systems to "go weird".
3110 */
3111 static void probe_for_hwifs (void)
/* */
3112 {
3113 #ifdef CONFIG_PCI
3114 /*
3115 * Find/initialize PCI IDE interfaces
3116 */
3117 if (pcibios_present()) {
3118 #ifdef CONFIG_BLK_DEV_RZ1000
3119 ide_pci_init_proc_t init_rz1000;
3120 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3121 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3122 #endif /* CONFIG_BLK_DEV_RZ1000 */
3123 #ifdef CONFIG_BLK_DEV_TRITON
3124 /*
3125 * Apparently the BIOS32 services on Intel motherboards are
3126 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3127 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3128 * and then add 1.
3129 */
3130 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3131 #endif /* CONFIG_BLK_DEV_TRITON */
3132 }
3133 #endif /* CONFIG_PCI */
3134 #ifdef CONFIG_BLK_DEV_CMD640
3135 {
3136 extern void ide_probe_for_cmd640x (void);
3137 ide_probe_for_cmd640x();
3138 }
3139 #endif
3140 #ifdef CONFIG_BLK_DEV_PROMISE
3141 init_dc4030();
3142 #endif
3143 }
3144
3145 static int hwif_init (int h)
/* */
3146 {
3147 ide_hwif_t *hwif = &ide_hwifs[h];
3148 void (*rfn)(void);
3149
3150 if (hwif->noprobe)
3151 return 0;
3152 else {
3153 if (hwif->io_base == HD_DATA)
3154 probe_cmos_for_drives (hwif);
3155 probe_hwif (hwif);
3156 if (!hwif->present)
3157 return 0;
3158 }
3159 if (!hwif->irq) {
3160 if (!(hwif->irq = default_irqs[h])) {
3161 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3162 return (hwif->present = 0);
3163 }
3164 }
3165 #ifdef CONFIG_BLK_DEV_HD
3166 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3167 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3168 return (hwif->present = 0);
3169 }
3170 #endif /* CONFIG_BLK_DEV_HD */
3171
3172 hwif->present = 0; /* we set it back to 1 if all is ok below */
3173 switch (hwif->major) {
3174 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3175 #if MAX_HWIFS > 1
3176 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3177 #endif
3178 #if MAX_HWIFS > 2
3179 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3180 #endif
3181 #if MAX_HWIFS > 3
3182 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3183 #endif
3184 default:
3185 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3186 return (hwif->present = 0);
3187 }
3188 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3189 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3190 } else if (init_irq (hwif)) {
3191 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3192 (void) unregister_blkdev (hwif->major, hwif->name);
3193 } else {
3194 init_gendisk(hwif);
3195 blk_dev[hwif->major].request_fn = rfn;
3196 read_ahead[hwif->major] = 8; /* (4kB) */
3197 hwif->present = 1; /* success */
3198 }
3199 return hwif->present;
3200 }
3201
3202 /*
3203 * This is gets invoked once during initialization, to set *everything* up
3204 */
3205 int ide_init (void)
/* */
3206 {
3207 int index;
3208
3209 init_ide_data ();
3210 /*
3211 * Probe for special "known" interface chipsets
3212 */
3213 probe_for_hwifs ();
3214
3215 /*
3216 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3217 */
3218 for (index = 0; index < MAX_HWIFS; ++index)
3219 hwif_init (index);
3220
3221 #ifdef CONFIG_BLK_DEV_IDETAPE
3222 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3223 #endif /* CONFIG_BLK_DEV_IDETAPE */
3224
3225 return 0;
3226 }
3227
3228 #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3229 int ide_register(int io_base, int ctl_port, int irq)
/* */
3230 {
3231 int index, i, rc = -1;
3232 ide_hwif_t *hwif;
3233 unsigned long flags;
3234
3235 save_flags(flags);
3236 cli();
3237 for (index = 0; index < MAX_HWIFS; ++index) {
3238 hwif = &ide_hwifs[index];
3239 if (hwif->present) {
3240 if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3241 break; /* this ide port already exists */
3242 } else {
3243 hwif->io_base = io_base;
3244 hwif->ctl_port = ctl_port;
3245 hwif->irq = irq;
3246 hwif->noprobe = 0;
3247 if (!hwif_init(index))
3248 break;
3249 for (i = 0; i < hwif->gd->nr_real; i++)
3250 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3251 rc = index;
3252 break;
3253 }
3254 }
3255 restore_flags(flags);
3256 return rc;
3257 }
3258
3259 void ide_unregister (unsigned int index)
/* ![[last]](../icons/n_last.png)
*/
3260 {
3261 struct gendisk *gd, **gdp;
3262 ide_hwif_t *hwif, *g;
3263 ide_hwgroup_t *hwgroup;
3264 int irq_count = 0;
3265 unsigned long flags;
3266
3267 if (index >= MAX_HWIFS)
3268 return;
3269 save_flags(flags);
3270 cli();
3271 hwif = &ide_hwifs[index];
3272 if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3273 restore_flags(flags);
3274 return;
3275 }
3276 hwif->present = 0;
3277 hwgroup = hwif->hwgroup;
3278
3279 /*
3280 * free the irq if we were the only hwif using it
3281 */
3282 g = hwgroup->hwif;
3283 do {
3284 if (g->irq == hwif->irq)
3285 ++irq_count;
3286 g = g->next;
3287 } while (g != hwgroup->hwif);
3288 if (irq_count == 1)
3289 free_irq(hwif->irq, hwgroup);
3290
3291 /*
3292 * Note that we only release the standard ports,
3293 * and do not even try to handle any extra ports
3294 * allocated for weird IDE interface chipsets.
3295 */
3296 release_region(hwif->io_base, 8);
3297 release_region(hwif->ctl_port, 1);
3298
3299 /*
3300 * Remove us from the hwgroup, and free
3301 * the hwgroup if we were the only member
3302 */
3303 while (hwgroup->hwif->next != hwif)
3304 hwgroup->hwif = hwgroup->hwif->next;
3305 hwgroup->hwif->next = hwif->next;
3306 if (hwgroup->hwif == hwif)
3307 hwgroup->hwif = hwif->next;
3308 if (hwgroup->next_hwif == hwif)
3309 hwgroup->next_hwif = hwif->next;
3310 if (hwgroup->hwif == hwif)
3311 kfree(hwgroup);
3312
3313 /*
3314 * Remove us from the kernel's knowledge
3315 */
3316 unregister_blkdev(hwif->major, hwif->name);
3317 kfree(blksize_size[hwif->major]);
3318 blk_dev[hwif->major].request_fn = NULL;
3319 blksize_size[hwif->major] = NULL;
3320 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
3321 if (*gdp == hwif->gd)
3322 break;
3323 if (*gdp == NULL)
3324 printk("gd not in disk chain!\n");
3325 else {
3326 gd = *gdp; *gdp = gd->next;
3327 kfree(gd->sizes);
3328 kfree(gd->part);
3329 kfree(gd);
3330 }
3331 init_hwif_data (index); /* restore hwif data to pristine status */
3332 restore_flags(flags);
3333 }
3334 #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/