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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.34 Mar 16, 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 *
225 * Some additional driver compile-time options are in ide.h
226 *
227 * To do, in likely order of completion:
228 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
229 */
230
231 #undef REALLY_SLOW_IO /* most systems can safely undef this */
232
233 #include <linux/config.h>
234 #include <linux/types.h>
235 #include <linux/string.h>
236 #include <linux/kernel.h>
237 #include <linux/delay.h>
238 #include <linux/timer.h>
239 #include <linux/mm.h>
240 #include <linux/ioport.h>
241 #include <linux/interrupt.h>
242 #include <linux/major.h>
243 #include <linux/blkdev.h>
244 #include <linux/errno.h>
245 #include <linux/hdreg.h>
246 #include <linux/genhd.h>
247 #include <linux/malloc.h>
248
249 #include <asm/byteorder.h>
250 #include <asm/irq.h>
251 #include <asm/segment.h>
252 #include <asm/io.h>
253
254 #ifdef CONFIG_PCI
255 #include <linux/bios32.h>
256 #include <linux/pci.h>
257 #endif /* CONFIG_PCI */
258
259 #include "ide.h"
260 #include "ide_modes.h"
261
262 #ifdef CONFIG_BLK_DEV_PROMISE
263 #include "promise.h"
264 #define IS_PROMISE_DRIVE (HWIF(drive)->chipset == ide_promise)
265 #else
266 #define IS_PROMISE_DRIVE (0) /* auto-NULLs out Promise code */
267 #endif /* CONFIG_BLK_DEV_PROMISE */
268
269 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
270
271 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
272 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
273
274 #if (DISK_RECOVERY_TIME > 0)
275 /*
276 * For really screwy hardware (hey, at least it *can* be used with Linux)
277 * we can enforce a minimum delay time between successive operations.
278 */
279 static unsigned long read_timer(void)
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*/
280 {
281 unsigned long t, flags;
282 int i;
283
284 save_flags(flags);
285 cli();
286 t = jiffies * 11932;
287 outb_p(0, 0x43);
288 i = inb_p(0x40);
289 i |= inb(0x40) << 8;
290 restore_flags(flags);
291 return (t - i);
292 }
293
294 static void set_recovery_timer (ide_hwif_t *hwif)
/* ![[previous]](../icons/left.png)
*/
295 {
296 hwif->last_time = read_timer();
297 }
298 #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
299
300 #else
301
302 #define SET_RECOVERY_TIMER(drive)
303
304 #endif /* DISK_RECOVERY_TIME */
305
306
307 /*
308 * Do not even *think* about calling this!
309 */
310 static void init_hwif_data (unsigned int index)
/* */
311 {
312 byte *p;
313 unsigned int unit;
314 ide_hwif_t *hwif = &ide_hwifs[index];
315
316 /* bulk initialize hwif & drive info with zeros */
317 p = ((byte *) hwif) + sizeof(ide_hwif_t);
318 do {
319 *--p = 0;
320 } while (p > (byte *) hwif);
321
322 /* fill in any non-zero initial values */
323 hwif->index = index;
324 hwif->noprobe = (index > 1);
325 hwif->io_base = default_io_base[index];
326 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
327 #ifdef CONFIG_BLK_DEV_HD
328 if (hwif->io_base == HD_DATA)
329 hwif->noprobe = 1; /* may be overriden by ide_setup() */
330 #endif /* CONFIG_BLK_DEV_HD */
331 hwif->major = ide_hwif_to_major[index];
332 hwif->name[0] = 'i';
333 hwif->name[1] = 'd';
334 hwif->name[2] = 'e';
335 hwif->name[3] = '0' + index;
336 #ifdef CONFIG_BLK_DEV_IDETAPE
337 hwif->tape_drive = NULL;
338 #endif /* CONFIG_BLK_DEV_IDETAPE */
339 for (unit = 0; unit < MAX_DRIVES; ++unit) {
340 ide_drive_t *drive = &hwif->drives[unit];
341
342 drive->select.all = (unit<<4)|0xa0;
343 drive->hwif = hwif;
344 drive->ctl = 0x08;
345 drive->ready_stat = READY_STAT;
346 drive->bad_wstat = BAD_W_STAT;
347 drive->special.b.recalibrate = 1;
348 drive->special.b.set_geometry = 1;
349 drive->name[0] = 'h';
350 drive->name[1] = 'd';
351 drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
352 }
353 }
354
355 /*
356 * init_ide_data() sets reasonable default values into all fields
357 * of all instances of the hwifs and drives, but only on the first call.
358 * Subsequent calls have no effect (they don't wipe out anything).
359 *
360 * This routine is normally called at driver initialization time,
361 * but may also be called MUCH earlier during kernel "command-line"
362 * parameter processing. As such, we cannot depend on any other parts
363 * of the kernel (such as memory allocation) to be functioning yet.
364 *
365 * This is too bad, as otherwise we could dynamically allocate the
366 * ide_drive_t structs as needed, rather than always consuming memory
367 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
368 */
369 #define MAGIC_COOKIE 0x12345678
370 static void init_ide_data (void)
/* */
371 {
372 unsigned int index;
373 static unsigned long magic_cookie = MAGIC_COOKIE;
374
375 if (magic_cookie != MAGIC_COOKIE)
376 return; /* already initialized */
377 magic_cookie = 0;
378
379 for (index = 0; index < MAX_HWIFS; ++index)
380 init_hwif_data(index);
381 }
382
383 #if SUPPORT_VLB_SYNC
384 /*
385 * Some localbus EIDE interfaces require a special access sequence
386 * when using 32-bit I/O instructions to transfer data. We call this
387 * the "vlb_sync" sequence, which consists of three successive reads
388 * of the sector count register location, with interrupts disabled
389 * to ensure that the reads all happen together.
390 */
391 static inline void do_vlb_sync (unsigned short port) {
/* */
392 (void) inb (port);
393 (void) inb (port);
394 (void) inb (port);
395 }
396 #endif /* SUPPORT_VLB_SYNC */
397
398 /*
399 * This is used for most PIO data transfers *from* the IDE interface
400 */
401 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
402 {
403 unsigned short io_base = HWIF(drive)->io_base;
404 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
405 byte io_32bit = drive->io_32bit;
406
407 if (io_32bit) {
408 #if SUPPORT_VLB_SYNC
409 if (io_32bit & 2) {
410 cli();
411 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
412 insl(data_reg, buffer, wcount);
413 if (drive->unmask)
414 sti();
415 } else
416 #endif /* SUPPORT_VLB_SYNC */
417 insl(data_reg, buffer, wcount);
418 } else
419 insw(data_reg, buffer, wcount<<1);
420 }
421
422 /*
423 * This is used for most PIO data transfers *to* the IDE interface
424 */
425 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
426 {
427 unsigned short io_base = HWIF(drive)->io_base;
428 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
429 byte io_32bit = drive->io_32bit;
430
431 if (io_32bit) {
432 #if SUPPORT_VLB_SYNC
433 if (io_32bit & 2) {
434 cli();
435 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
436 outsl(data_reg, buffer, wcount);
437 if (drive->unmask)
438 sti();
439 } else
440 #endif /* SUPPORT_VLB_SYNC */
441 outsl(data_reg, buffer, wcount);
442 } else
443 outsw(data_reg, buffer, wcount<<1);
444 }
445
446 /*
447 * This should get invoked any time we exit the driver to
448 * wait for an interrupt response from a drive. handler() points
449 * at the appropriate code to handle the next interrupt, and a
450 * timer is started to prevent us from waiting forever in case
451 * something goes wrong (see the timer_expiry() handler later on).
452 */
453 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
/* */
454 {
455 ide_hwgroup_t *hwgroup = HWGROUP(drive);
456 #ifdef DEBUG
457 if (hwgroup->handler != NULL) {
458 printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
459 drive->name, hwgroup->handler, handler);
460 }
461 #endif
462 hwgroup->handler = handler;
463 hwgroup->timer.expires = jiffies + timeout;
464 add_timer(&(hwgroup->timer));
465 }
466
467 /*
468 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
469 * value for this drive (from its reported identification information).
470 *
471 * Returns: 1 if lba_capacity looks sensible
472 * 0 otherwise
473 */
474 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
475 {
476 unsigned long lba_sects = id->lba_capacity;
477 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
478 unsigned long _10_percent = chs_sects / 10;
479
480 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
481 if ((lba_sects - chs_sects) < _10_percent)
482 return 1; /* lba_capacity is good */
483
484 /* some drives have the word order reversed */
485 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
486 if ((lba_sects - chs_sects) < _10_percent) {
487 id->lba_capacity = lba_sects; /* fix it */
488 return 1; /* lba_capacity is (now) good */
489 }
490 return 0; /* lba_capacity value is bad */
491 }
492
493 /*
494 * current_capacity() returns the capacity (in sectors) of a drive
495 * according to its current geometry/LBA settings.
496 */
497 static unsigned long current_capacity (ide_drive_t *drive)
/* */
498 {
499 struct hd_driveid *id = drive->id;
500 unsigned long capacity = drive->cyl * drive->head * drive->sect;
501
502 if (!drive->present)
503 return 0;
504 if (drive->media != ide_disk)
505 return 0x7fffffff; /* cdrom or tape */
506 if (!IS_PROMISE_DRIVE) {
507 drive->select.b.lba = 0;
508 /* Determine capacity, and use LBA if the drive properly supports it */
509 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
510 if (id->lba_capacity >= capacity) {
511 capacity = id->lba_capacity;
512 drive->select.b.lba = 1;
513 }
514 }
515 }
516 return (capacity - drive->sect0);
517 }
518
519 /*
520 * ide_geninit() is called exactly *once* for each major, from genhd.c,
521 * at the beginning of the initial partition check for the drives.
522 */
523 static void ide_geninit (struct gendisk *gd)
/* */
524 {
525 unsigned int unit;
526 ide_hwif_t *hwif = gd->real_devices;
527
528 for (unit = 0; unit < gd->nr_real; ++unit) {
529 ide_drive_t *drive = &hwif->drives[unit];
530 #ifdef CONFIG_BLK_DEV_IDECD
531 if (drive->present && drive->media == ide_cdrom)
532 ide_cdrom_setup(drive);
533 #endif /* CONFIG_BLK_DEV_IDECD */
534 #ifdef CONFIG_BLK_DEV_IDETAPE
535 if (drive->present && drive->media == ide_tape)
536 idetape_setup(drive);
537 #endif /* CONFIG_BLK_DEV_IDETAPE */
538 drive->part[0].nr_sects = current_capacity(drive);
539 if (!drive->present || drive->media != ide_disk) {
540 drive->part[0].start_sect = -1; /* skip partition check */
541 }
542 }
543 }
544
545 /*
546 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
547 * after probing for drives, to allocate partition tables and other data
548 * structures needed for the routines in genhd.c. ide_geninit() gets called
549 * somewhat later, during the partition check.
550 */
551 static void init_gendisk (ide_hwif_t *hwif)
/* */
552 {
553 struct gendisk *gd, **gdp;
554 unsigned int unit, units, minors;
555 int *bs;
556
557 /* figure out maximum drive number on the interface */
558 for (units = MAX_DRIVES; units > 0; --units) {
559 if (hwif->drives[units-1].present)
560 break;
561 }
562 minors = units * (1<<PARTN_BITS);
563 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
564 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
565 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
566 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
567
568 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
569 blksize_size[hwif->major] = bs;
570 for (unit = 0; unit < minors; ++unit)
571 *bs++ = BLOCK_SIZE;
572
573 for (unit = 0; unit < units; ++unit)
574 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
575
576 gd->major = hwif->major; /* our major device number */
577 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
578 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
579 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
580 gd->max_nr = units; /* max num real drives */
581 gd->nr_real = units; /* current num real drives */
582 gd->init = ide_geninit; /* initialization function */
583 gd->real_devices= hwif; /* ptr to internal data */
584 gd->next = NULL; /* linked list of major devs */
585
586 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
587 hwif->gd = *gdp = gd; /* link onto tail of list */
588 }
589
590 static void do_reset1 (ide_drive_t *, int); /* needed below */
591
592 #ifdef CONFIG_BLK_DEV_IDEATAPI
593 /*
594 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
595 * during an atapi drive reset operation. If the drive has not yet responded,
596 * and we have not yet hit our maximum waiting time, then the timer is restarted
597 * for another 50ms.
598 */
599 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
600 {
601 ide_hwgroup_t *hwgroup = HWGROUP(drive);
602 byte stat;
603
604 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
605 udelay (10);
606
607 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
608 printk("%s: ATAPI reset complete\n", drive->name);
609 } else {
610 if (jiffies < hwgroup->poll_timeout) {
611 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
612 return; /* continue polling */
613 }
614 hwgroup->poll_timeout = 0; /* end of polling */
615 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
616 do_reset1 (drive, 1); /* do it the old fashioned way */
617 }
618 hwgroup->poll_timeout = 0; /* done polling */
619 }
620 #endif /* CONFIG_BLK_DEV_IDEATAPI */
621
622 /*
623 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
624 * during an ide reset operation. If the drives have not yet responded,
625 * and we have not yet hit our maximum waiting time, then the timer is restarted
626 * for another 50ms.
627 */
628 static void reset_pollfunc (ide_drive_t *drive)
/* */
629 {
630 ide_hwgroup_t *hwgroup = HWGROUP(drive);
631 ide_hwif_t *hwif = HWIF(drive);
632 byte tmp;
633
634 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
635 if (jiffies < hwgroup->poll_timeout) {
636 ide_set_handler (drive, &reset_pollfunc, HZ/20);
637 return; /* continue polling */
638 }
639 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
640 } else {
641 printk("%s: reset: ", hwif->name);
642 if ((tmp = GET_ERR()) == 1)
643 printk("success\n");
644 else {
645 #if FANCY_STATUS_DUMPS
646 printk("master: ");
647 switch (tmp & 0x7f) {
648 case 1: printk("passed");
649 break;
650 case 2: printk("formatter device error");
651 break;
652 case 3: printk("sector buffer error");
653 break;
654 case 4: printk("ECC circuitry error");
655 break;
656 case 5: printk("controlling MPU error");
657 break;
658 default:printk("error (0x%02x?)", tmp);
659 }
660 if (tmp & 0x80)
661 printk("; slave: failed");
662 printk("\n");
663 #else
664 printk("failed\n");
665 #endif /* FANCY_STATUS_DUMPS */
666 }
667 }
668 hwgroup->poll_timeout = 0; /* done polling */
669 }
670
671 /*
672 * do_reset1() attempts to recover a confused drive by resetting it.
673 * Unfortunately, resetting a disk drive actually resets all devices on
674 * the same interface, so it can really be thought of as resetting the
675 * interface rather than resetting the drive.
676 *
677 * ATAPI devices have their own reset mechanism which allows them to be
678 * individually reset without clobbering other devices on the same interface.
679 *
680 * Unfortunately, the IDE interface does not generate an interrupt to let
681 * us know when the reset operation has finished, so we must poll for this.
682 * Equally poor, though, is the fact that this may a very long time to complete,
683 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
684 * we set a timer to poll at 50ms intervals.
685 */
686 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
687 {
688 unsigned int unit;
689 unsigned long flags;
690 ide_hwif_t *hwif = HWIF(drive);
691 ide_hwgroup_t *hwgroup = HWGROUP(drive);
692
693 save_flags(flags);
694 cli(); /* Why ? */
695
696 #ifdef CONFIG_BLK_DEV_IDEATAPI
697 /* For an ATAPI device, first try an ATAPI SRST. */
698 if (drive->media != ide_disk) {
699 if (!do_not_try_atapi) {
700 if (!drive->keep_settings)
701 drive->unmask = 0;
702 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
703 udelay (20);
704 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
705 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
706 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
707 restore_flags (flags);
708 return;
709 }
710 }
711 #endif /* CONFIG_BLK_DEV_IDEATAPI */
712
713 /*
714 * First, reset any device state data we were maintaining
715 * for any of the drives on this interface.
716 */
717 for (unit = 0; unit < MAX_DRIVES; ++unit) {
718 ide_drive_t *rdrive = &hwif->drives[unit];
719 rdrive->special.all = 0;
720 rdrive->special.b.set_geometry = 1;
721 rdrive->special.b.recalibrate = 1;
722 if (OK_TO_RESET_CONTROLLER)
723 rdrive->mult_count = 0;
724 if (!rdrive->keep_settings) {
725 rdrive->mult_req = 0;
726 rdrive->unmask = 0;
727 if (rdrive->using_dma) {
728 rdrive->using_dma = 0;
729 printk("%s: disabled DMA\n", rdrive->name);
730 }
731 }
732 if (rdrive->mult_req != rdrive->mult_count)
733 rdrive->special.b.set_multmode = 1;
734 }
735
736 #if OK_TO_RESET_CONTROLLER
737 /*
738 * Note that we also set nIEN while resetting the device,
739 * to mask unwanted interrupts from the interface during the reset.
740 * However, due to the design of PC hardware, this will cause an
741 * immediate interrupt due to the edge transition it produces.
742 * This single interrupt gives us a "fast poll" for drives that
743 * recover from reset very quickly, saving us the first 50ms wait time.
744 */
745 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
746 udelay(5); /* more than enough time */
747 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
748 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
749 ide_set_handler (drive, &reset_pollfunc, HZ/20);
750 #endif /* OK_TO_RESET_CONTROLLER */
751
752 restore_flags (flags);
753 }
754
755 /*
756 * ide_do_reset() is the entry point to the drive/interface reset code.
757 */
758 void ide_do_reset (ide_drive_t *drive)
/* */
759 {
760 do_reset1 (drive, 0);
761 #ifdef CONFIG_BLK_DEV_IDETAPE
762 if (drive->media == ide_tape)
763 drive->tape.reset_issued=1;
764 #endif /* CONFIG_BLK_DEV_IDETAPE */
765 }
766
767 /*
768 * Clean up after success/failure of an explicit drive cmd
769 */
770 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
771 {
772 unsigned long flags;
773 struct request *rq = HWGROUP(drive)->rq;
774
775 if (rq->cmd == IDE_DRIVE_CMD) {
776 byte *args = (byte *) rq->buffer;
777 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
778 if (args) {
779 args[0] = stat;
780 args[1] = err;
781 args[2] = IN_BYTE(IDE_NSECTOR_REG);
782 }
783 }
784 save_flags(flags);
785 cli();
786 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
787 HWGROUP(drive)->rq = NULL;
788 rq->rq_status = RQ_INACTIVE;
789 if (rq->sem != NULL)
790 up(rq->sem);
791 restore_flags(flags);
792 }
793
794 /*
795 * Error reporting, in human readable form (luxurious, but a memory hog).
796 */
797 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
798 {
799 unsigned long flags;
800 byte err = 0;
801
802 save_flags (flags);
803 sti();
804 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
805 #if FANCY_STATUS_DUMPS
806 if (drive->media == ide_disk) {
807 printk(" { ");
808 if (stat & BUSY_STAT)
809 printk("Busy ");
810 else {
811 if (stat & READY_STAT) printk("DriveReady ");
812 if (stat & WRERR_STAT) printk("DeviceFault ");
813 if (stat & SEEK_STAT) printk("SeekComplete ");
814 if (stat & DRQ_STAT) printk("DataRequest ");
815 if (stat & ECC_STAT) printk("CorrectedError ");
816 if (stat & INDEX_STAT) printk("Index ");
817 if (stat & ERR_STAT) printk("Error ");
818 }
819 printk("}");
820 }
821 #endif /* FANCY_STATUS_DUMPS */
822 printk("\n");
823 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
824 err = GET_ERR();
825 printk("%s: %s: error=0x%02x", drive->name, msg, err);
826 #if FANCY_STATUS_DUMPS
827 if (drive->media == ide_disk) {
828 printk(" { ");
829 if (err & BBD_ERR) printk("BadSector ");
830 if (err & ECC_ERR) printk("UncorrectableError ");
831 if (err & ID_ERR) printk("SectorIdNotFound ");
832 if (err & ABRT_ERR) printk("DriveStatusError ");
833 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
834 if (err & MARK_ERR) printk("AddrMarkNotFound ");
835 printk("}");
836 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
837 byte cur = IN_BYTE(IDE_SELECT_REG);
838 if (cur & 0x40) { /* using LBA? */
839 printk(", LBAsect=%ld", (unsigned long)
840 ((cur&0xf)<<24)
841 |(IN_BYTE(IDE_HCYL_REG)<<16)
842 |(IN_BYTE(IDE_LCYL_REG)<<8)
843 | IN_BYTE(IDE_SECTOR_REG));
844 } else {
845 printk(", CHS=%d/%d/%d",
846 (IN_BYTE(IDE_HCYL_REG)<<8) +
847 IN_BYTE(IDE_LCYL_REG),
848 cur & 0xf,
849 IN_BYTE(IDE_SECTOR_REG));
850 }
851 if (HWGROUP(drive)->rq)
852 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
853 }
854 }
855 #endif /* FANCY_STATUS_DUMPS */
856 printk("\n");
857 }
858 restore_flags (flags);
859 return err;
860 }
861
862 /*
863 * try_to_flush_leftover_data() is invoked in response to a drive
864 * unexpectedly having its DRQ_STAT bit set. As an alternative to
865 * resetting the drive, this routine tries to clear the condition
866 * by read a sector's worth of data from the drive. Of course,
867 * this may not help if the drive is *waiting* for data from *us*.
868 */
869 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
870 {
871 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
872
873 while (i > 0) {
874 unsigned long buffer[16];
875 unsigned int wcount = (i > 16) ? 16 : i;
876 i -= wcount;
877 ide_input_data (drive, buffer, wcount);
878 }
879 }
880
881 /*
882 * ide_error() takes action based on the error returned by the controller.
883 */
884 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
885 {
886 struct request *rq;
887 byte err;
888
889 err = ide_dump_status(drive, msg, stat);
890 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
891 return;
892 /* retry only "normal" I/O: */
893 if (rq->cmd == IDE_DRIVE_CMD) {
894 rq->errors = 1;
895 ide_end_drive_cmd(drive, stat, err);
896 return;
897 }
898 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
899 rq->errors |= ERROR_RESET;
900 } else {
901 if (drive->media == ide_disk && (stat & ERR_STAT)) {
902 /* err has different meaning on cdrom and tape */
903 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
904 rq->errors = ERROR_MAX;
905 else if (err & TRK0_ERR) /* help it find track zero */
906 rq->errors |= ERROR_RECAL;
907 }
908 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
909 try_to_flush_leftover_data(drive);
910 }
911 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
912 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
913
914 if (rq->errors >= ERROR_MAX) {
915 #ifdef CONFIG_BLK_DEV_IDETAPE
916 if (drive->media == ide_tape) {
917 rq->errors = 0;
918 idetape_end_request(0, HWGROUP(drive));
919 }
920 else
921 #endif /* CONFIG_BLK_DEV_IDETAPE */
922 ide_end_request(0, HWGROUP(drive));
923 }
924 else {
925 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
926 ++rq->errors;
927 ide_do_reset(drive);
928 return;
929 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
930 drive->special.b.recalibrate = 1;
931 ++rq->errors;
932 }
933 }
934
935 /*
936 * read_intr() is the handler for disk read/multread interrupts
937 */
938 static void read_intr (ide_drive_t *drive)
/* */
939 {
940 byte stat;
941 int i;
942 unsigned int msect, nsect;
943 struct request *rq;
944
945 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
946 ide_error(drive, "read_intr", stat);
947 return;
948 }
949 msect = drive->mult_count;
950 read_next:
951 rq = HWGROUP(drive)->rq;
952 if (msect) {
953 if ((nsect = rq->current_nr_sectors) > msect)
954 nsect = msect;
955 msect -= nsect;
956 } else
957 nsect = 1;
958 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
959 #ifdef DEBUG
960 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
961 drive->name, rq->sector, rq->sector+nsect-1,
962 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
963 #endif
964 rq->sector += nsect;
965 rq->buffer += nsect<<9;
966 rq->errors = 0;
967 i = (rq->nr_sectors -= nsect);
968 if ((rq->current_nr_sectors -= nsect) <= 0)
969 ide_end_request(1, HWGROUP(drive));
970 if (i > 0) {
971 if (msect)
972 goto read_next;
973 ide_set_handler (drive, &read_intr, WAIT_CMD);
974 }
975 }
976
977 /*
978 * write_intr() is the handler for disk write interrupts
979 */
980 static void write_intr (ide_drive_t *drive)
/* */
981 {
982 byte stat;
983 int i;
984 ide_hwgroup_t *hwgroup = HWGROUP(drive);
985 struct request *rq = hwgroup->rq;
986
987 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
988 #ifdef DEBUG
989 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
990 drive->name, rq->sector, (unsigned long) rq->buffer,
991 rq->nr_sectors-1);
992 #endif
993 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
994 rq->sector++;
995 rq->buffer += 512;
996 rq->errors = 0;
997 i = --rq->nr_sectors;
998 --rq->current_nr_sectors;
999 if (rq->current_nr_sectors <= 0)
1000 ide_end_request(1, hwgroup);
1001 if (i > 0) {
1002 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1003 ide_set_handler (drive, &write_intr, WAIT_CMD);
1004 }
1005 return;
1006 }
1007 }
1008 ide_error(drive, "write_intr", stat);
1009 }
1010
1011 /*
1012 * ide_multwrite() transfers a block of up to mcount sectors of data
1013 * to a drive as part of a disk multiple-sector write operation.
1014 */
1015 void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
/* */
1016 {
1017 struct request *rq = &HWGROUP(drive)->wrq;
1018
1019 do {
1020 unsigned int nsect = rq->current_nr_sectors;
1021 if (nsect > mcount)
1022 nsect = mcount;
1023 mcount -= nsect;
1024
1025 ide_output_data(drive, rq->buffer, nsect<<7);
1026 #ifdef DEBUG
1027 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1028 drive->name, rq->sector, (unsigned long) rq->buffer,
1029 nsect, rq->nr_sectors - nsect);
1030 #endif
1031 if ((rq->nr_sectors -= nsect) <= 0)
1032 break;
1033 if ((rq->current_nr_sectors -= nsect) == 0) {
1034 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1035 rq->current_nr_sectors = rq->bh->b_size>>9;
1036 rq->buffer = rq->bh->b_data;
1037 } else {
1038 panic("%s: buffer list corrupted\n", drive->name);
1039 break;
1040 }
1041 } else {
1042 rq->buffer += nsect << 9;
1043 }
1044 } while (mcount);
1045 }
1046
1047 /*
1048 * multwrite_intr() is the handler for disk multwrite interrupts
1049 */
1050 static void multwrite_intr (ide_drive_t *drive)
/* */
1051 {
1052 byte stat;
1053 int i;
1054 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1055 struct request *rq = &hwgroup->wrq;
1056
1057 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1058 if (stat & DRQ_STAT) {
1059 if (rq->nr_sectors) {
1060 ide_multwrite(drive, drive->mult_count);
1061 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1062 return;
1063 }
1064 } else {
1065 if (!rq->nr_sectors) { /* all done? */
1066 rq = hwgroup->rq;
1067 for (i = rq->nr_sectors; i > 0;){
1068 i -= rq->current_nr_sectors;
1069 ide_end_request(1, hwgroup);
1070 }
1071 return;
1072 }
1073 }
1074 }
1075 ide_error(drive, "multwrite_intr", stat);
1076 }
1077
1078 /*
1079 * Issue a simple drive command
1080 * The drive must be selected beforehand.
1081 */
1082 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1083 {
1084 ide_set_handler (drive, handler, WAIT_CMD);
1085 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1086 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1087 OUT_BYTE(cmd,IDE_COMMAND_REG);
1088 }
1089
1090 /*
1091 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1092 */
1093 static void set_multmode_intr (ide_drive_t *drive)
/* */
1094 {
1095 byte stat = GET_STAT();
1096
1097 sti();
1098 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1099 drive->mult_count = drive->mult_req;
1100 } else {
1101 drive->mult_req = drive->mult_count = 0;
1102 drive->special.b.recalibrate = 1;
1103 (void) ide_dump_status(drive, "set_multmode", stat);
1104 }
1105 }
1106
1107 /*
1108 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1109 */
1110 static void set_geometry_intr (ide_drive_t *drive)
/* */
1111 {
1112 byte stat = GET_STAT();
1113
1114 sti();
1115 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1116 ide_error(drive, "set_geometry_intr", stat);
1117 }
1118
1119 /*
1120 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1121 */
1122 static void recal_intr (ide_drive_t *drive)
/* */
1123 {
1124 byte stat = GET_STAT();
1125
1126 sti();
1127 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1128 ide_error(drive, "recal_intr", stat);
1129 }
1130
1131 /*
1132 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1133 */
1134 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1135 {
1136 struct request *rq = HWGROUP(drive)->rq;
1137 byte *args = (byte *) rq->buffer;
1138 byte stat = GET_STAT();
1139
1140 sti();
1141 if ((stat & DRQ_STAT) && args && args[3]) {
1142 ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1143 stat = GET_STAT();
1144 }
1145 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1146 ide_end_drive_cmd (drive, stat, GET_ERR());
1147 else
1148 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1149 }
1150
1151 /*
1152 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1153 * commands to a drive. It used to do much more, but has been scaled back.
1154 */
1155 static inline void do_special (ide_drive_t *drive)
/* */
1156 {
1157 special_t *s = &drive->special;
1158 next:
1159 #ifdef DEBUG
1160 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1161 #endif
1162 if (s->b.set_geometry) {
1163 s->b.set_geometry = 0;
1164 if (drive->media == ide_disk) {
1165 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1166 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1167 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1168 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1169 if (!IS_PROMISE_DRIVE)
1170 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1171 }
1172 } else if (s->b.recalibrate) {
1173 s->b.recalibrate = 0;
1174 if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1175 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1176 } else if (s->b.set_pio) {
1177 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1178 s->b.set_pio = 0;
1179 if (tuneproc != NULL)
1180 tuneproc(drive, drive->pio_req);
1181 goto next;
1182 } else if (s->b.set_multmode) {
1183 s->b.set_multmode = 0;
1184 if (drive->media == ide_disk) {
1185 if (drive->id && drive->mult_req > drive->id->max_multsect)
1186 drive->mult_req = drive->id->max_multsect;
1187 if (!IS_PROMISE_DRIVE)
1188 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1189 } else
1190 drive->mult_req = 0;
1191 } else if (s->all) {
1192 int special = s->all;
1193 s->all = 0;
1194 printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1195 }
1196 }
1197
1198 /*
1199 * This routine busy-waits for the drive status to be not "busy".
1200 * It then checks the status for all of the "good" bits and none
1201 * of the "bad" bits, and if all is okay it returns 0. All other
1202 * cases return 1 after invoking ide_error() -- caller should just return.
1203 *
1204 * This routine should get fixed to not hog the cpu during extra long waits..
1205 * That could be done by busy-waiting for the first jiffy or two, and then
1206 * setting a timer to wake up at half second intervals thereafter,
1207 * until timeout is achieved, before timing out.
1208 */
1209 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1210 {
1211 byte stat;
1212 unsigned long flags;
1213
1214 test:
1215 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1216 if (OK_STAT((stat = GET_STAT()), good, bad))
1217 return 0; /* fast exit for most frequent case */
1218 if (!(stat & BUSY_STAT)) {
1219 ide_error(drive, "status error", stat);
1220 return 1;
1221 }
1222
1223 save_flags(flags);
1224 sti();
1225 timeout += jiffies;
1226 do {
1227 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1228 restore_flags(flags);
1229 goto test;
1230 }
1231 } while (jiffies <= timeout);
1232
1233 restore_flags(flags);
1234 ide_error(drive, "status timeout", GET_STAT());
1235 return 1;
1236 }
1237
1238 /*
1239 * do_rw_disk() issues READ and WRITE commands to a disk,
1240 * using LBA if supported, or CHS otherwise, to address sectors.
1241 * It also takes care of issuing special DRIVE_CMDs.
1242 */
1243 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1244 {
1245 ide_hwif_t *hwif = HWIF(drive);
1246 unsigned short io_base = hwif->io_base;
1247
1248 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1249 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1250 if (drive->select.b.lba) {
1251 #ifdef DEBUG
1252 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1253 drive->name, (rq->cmd==READ)?"read":"writ",
1254 block, rq->nr_sectors, (unsigned long) rq->buffer);
1255 #endif
1256 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1257 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1258 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1259 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1260 } else {
1261 unsigned int sect,head,cyl,track;
1262 track = block / drive->sect;
1263 sect = block % drive->sect + 1;
1264 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1265 head = track % drive->head;
1266 cyl = track / drive->head;
1267 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1268 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1269 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1270 #ifdef DEBUG
1271 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1272 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1273 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1274 #endif
1275 }
1276 #ifdef CONFIG_BLK_DEV_PROMISE
1277 if (IS_PROMISE_DRIVE) {
1278 if (hwif->is_promise2 || rq->cmd == READ) {
1279 do_promise_io (drive, rq);
1280 return;
1281 }
1282 }
1283 #endif /* CONFIG_BLK_DEV_PROMISE */
1284 if (rq->cmd == READ) {
1285 #ifdef CONFIG_BLK_DEV_TRITON
1286 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1287 return;
1288 #endif /* CONFIG_BLK_DEV_TRITON */
1289 ide_set_handler(drive, &read_intr, WAIT_CMD);
1290 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1291 return;
1292 }
1293 if (rq->cmd == WRITE) {
1294 #ifdef CONFIG_BLK_DEV_TRITON
1295 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1296 return;
1297 #endif /* CONFIG_BLK_DEV_TRITON */
1298 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1299 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1300 printk("%s: no DRQ after issuing %s\n", drive->name,
1301 drive->mult_count ? "MULTWRITE" : "WRITE");
1302 return;
1303 }
1304 if (!drive->unmask)
1305 cli();
1306 if (drive->mult_count) {
1307 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1308 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1309 ide_multwrite(drive, drive->mult_count);
1310 } else {
1311 ide_set_handler (drive, &write_intr, WAIT_CMD);
1312 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1313 }
1314 return;
1315 }
1316 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1317 ide_end_request(0, HWGROUP(drive));
1318 }
1319
1320 /*
1321 * execute_drive_cmd() issues a special drive command,
1322 * usually initiated by ioctl() from the external hdparm program.
1323 */
1324 static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
/* */
1325 {
1326 byte *args = rq->buffer;
1327 if (args) {
1328 #ifdef DEBUG
1329 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1330 drive->name, args[0], args[1], args[2], args[3]);
1331 #endif
1332 OUT_BYTE(args[2],IDE_FEATURE_REG);
1333 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1334 return;
1335 } else {
1336 /*
1337 * NULL is actually a valid way of waiting for
1338 * all current requests to be flushed from the queue.
1339 */
1340 #ifdef DEBUG
1341 printk("%s: DRIVE_CMD (null)\n", drive->name);
1342 #endif
1343 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1344 return;
1345 }
1346 }
1347
1348 /*
1349 * do_request() initiates handling of a new I/O request
1350 */
1351 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1352 {
1353 unsigned int minor, unit;
1354 unsigned long block, blockend;
1355 ide_drive_t *drive;
1356
1357 sti();
1358 #ifdef DEBUG
1359 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1360 #endif
1361 minor = MINOR(rq->rq_dev);
1362 unit = minor >> PARTN_BITS;
1363 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1364 printk("%s: bad device number: %s\n",
1365 hwif->name, kdevname(rq->rq_dev));
1366 goto kill_rq;
1367 }
1368 drive = &hwif->drives[unit];
1369 #ifdef DEBUG
1370 if (rq->bh && !buffer_locked(rq->bh)) {
1371 printk("%s: block not locked\n", drive->name);
1372 goto kill_rq;
1373 }
1374 #endif
1375 block = rq->sector;
1376 blockend = block + rq->nr_sectors;
1377 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1378 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1379 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1380 goto kill_rq;
1381 }
1382 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1383 #if FAKE_FDISK_FOR_EZDRIVE
1384 if (block == 0 && drive->remap_0_to_1)
1385 block = 1; /* redirect MBR access to EZ-Drive partn table */
1386 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1387 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1388 #if (DISK_RECOVERY_TIME > 0)
1389 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1390 #endif
1391
1392 #ifdef CONFIG_BLK_DEV_IDETAPE
1393 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1394 #endif /* CONFIG_BLK_DEV_IDETAPE */
1395
1396 SELECT_DRIVE(hwif,drive);
1397 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1398 printk("%s: drive not ready for command\n", drive->name);
1399 return;
1400 }
1401
1402 if (!drive->special.all) {
1403 if (rq->cmd == IDE_DRIVE_CMD) {
1404 execute_drive_cmd(drive, rq);
1405 return;
1406 }
1407 #ifdef CONFIG_BLK_DEV_IDEATAPI
1408 switch (drive->media) {
1409 case ide_disk:
1410 do_rw_disk (drive, rq, block);
1411 return;
1412 #ifdef CONFIG_BLK_DEV_IDECD
1413 case ide_cdrom:
1414 ide_do_rw_cdrom (drive, block);
1415 return;
1416 #endif /* CONFIG_BLK_DEV_IDECD */
1417 #ifdef CONFIG_BLK_DEV_IDETAPE
1418 case ide_tape:
1419 idetape_do_request (drive, rq, block);
1420 return;
1421 #endif /* CONFIG_BLK_DEV_IDETAPE */
1422
1423 default:
1424 printk("%s: media type %d not supported\n",
1425 drive->name, drive->media);
1426 goto kill_rq;
1427 }
1428 #else
1429 do_rw_disk (drive, rq, block); /* simpler and faster */
1430 return;
1431 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1432 }
1433 do_special(drive);
1434 return;
1435 kill_rq:
1436 ide_end_request(0, hwif->hwgroup);
1437 }
1438
1439 /*
1440 * The driver enables interrupts as much as possible. In order to do this,
1441 * (a) the device-interrupt is always masked before entry, and
1442 * (b) the timeout-interrupt is always disabled before entry.
1443 *
1444 * If we enter here from, say irq14, and then start a new request for irq15,
1445 * (possible with "serialize" option) then we cannot ensure that we exit
1446 * before the irq15 hits us. So, we must be careful not to let this bother us.
1447 *
1448 * Interrupts are still masked (by default) whenever we are exchanging
1449 * data/cmds with a drive, because some drives seem to have very poor
1450 * tolerance for latency during I/O. For devices which don't suffer from
1451 * this problem (most don't), the unmask flag can be set using the "hdparm"
1452 * utility, to permit other interrupts during data/cmd transfers.
1453 */
1454 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1455 {
1456 cli(); /* paranoia */
1457 if (hwgroup->handler != NULL) {
1458 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1459 return;
1460 }
1461 do {
1462 ide_hwif_t *hwif = hwgroup->hwif;
1463 struct request *rq;
1464 if ((rq = hwgroup->rq) == NULL) {
1465 /*
1466 * hwgroup->next_hwif is different from hwgroup->hwif
1467 * only when a request is inserted using "ide_next".
1468 * This saves wear and tear on IDE tapes.
1469 */
1470 hwif = hwgroup->next_hwif;
1471 do {
1472 if (IS_PLUGGED(blk_dev + hwif->major))
1473 continue;
1474 rq = blk_dev[hwif->major].current_request;
1475 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1476 goto got_rq;
1477 } while ((hwif = hwif->next) != hwgroup->next_hwif);
1478 return; /* no work left for this hwgroup */
1479 }
1480 got_rq:
1481 do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1482 cli();
1483 } while (hwgroup->handler == NULL);
1484 }
1485
1486 /*
1487 * do_hwgroup_request() invokes ide_do_request() after first masking
1488 * all possible interrupts for the current hwgroup. This prevents race
1489 * conditions in the event that an unexpected interrupt occurs while
1490 * we are in the driver.
1491 *
1492 * Note that when an interrupt is used to reenter the driver, the first level
1493 * handler will already have masked the irq that triggered, but any other ones
1494 * for the hwgroup will still be unmasked. The driver tries to be careful
1495 * about such things.
1496 */
1497 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1498 {
1499 if (hwgroup->handler == NULL) {
1500 ide_hwif_t *hgif = hwgroup->hwif;
1501 ide_hwif_t *hwif = hgif;
1502 do {
1503 disable_irq(hwif->irq);
1504 } while ((hwif = hwif->next) != hgif);
1505 ide_do_request (hwgroup);
1506 do {
1507 enable_irq(hwif->irq);
1508 } while ((hwif = hwif->next) != hgif);
1509 }
1510 }
1511
1512 static void do_ide0_request (void) /* invoked with cli() */
/* */
1513 {
1514 do_hwgroup_request (ide_hwifs[0].hwgroup);
1515 }
1516
1517 #if MAX_HWIFS > 1
1518 static void do_ide1_request (void) /* invoked with cli() */
/* */
1519 {
1520 do_hwgroup_request (ide_hwifs[1].hwgroup);
1521 }
1522 #endif
1523
1524 #if MAX_HWIFS > 2
1525 static void do_ide2_request (void) /* invoked with cli() */
/* */
1526 {
1527 do_hwgroup_request (ide_hwifs[2].hwgroup);
1528 }
1529 #endif
1530
1531 #if MAX_HWIFS > 3
1532 static void do_ide3_request (void) /* invoked with cli() */
/* */
1533 {
1534 do_hwgroup_request (ide_hwifs[3].hwgroup);
1535 }
1536 #endif
1537
1538 static void timer_expiry (unsigned long data)
/* */
1539 {
1540 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1541 ide_drive_t *drive = hwgroup->drive;
1542 unsigned long flags;
1543
1544 save_flags(flags);
1545 cli();
1546
1547 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1548 ide_handler_t *handler = hwgroup->handler;
1549 hwgroup->handler = NULL;
1550 handler(drive);
1551 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1552 sti(); /* drive must have responded just as the timer expired */
1553 printk("%s: marginal timeout\n", drive->name);
1554 } else {
1555 hwgroup->handler = NULL; /* abort the operation */
1556 if (hwgroup->hwif->dmaproc)
1557 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1558 ide_error(drive, "irq timeout", GET_STAT());
1559 }
1560 if (hwgroup->handler == NULL)
1561 do_hwgroup_request (hwgroup);
1562 restore_flags(flags);
1563 }
1564
1565 /*
1566 * There's nothing really useful we can do with an unexpected interrupt,
1567 * other than reading the status register (to clear it), and logging it.
1568 * There should be no way that an irq can happen before we're ready for it,
1569 * so we needn't worry much about losing an "important" interrupt here.
1570 *
1571 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1572 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1573 * "good", we just ignore the interrupt completely.
1574 *
1575 * This routine assumes cli() is in effect when called.
1576 *
1577 * If an unexpected interrupt happens on irq15 while we are handling irq14
1578 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1579 * we could screw up by interfering with a new request being set up for irq15.
1580 *
1581 * In reality, this is a non-issue. The new command is not sent unless the
1582 * drive is ready to accept one, in which case we know the drive is not
1583 * trying to interrupt us. And ide_set_handler() is always invoked before
1584 * completing the issuance of any new drive command, so we will not be
1585 * accidently invoked as a result of any valid command completion interrupt.
1586 *
1587 */
1588 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1589 {
1590 byte stat;
1591 unsigned int unit;
1592 ide_hwif_t *hwif = hwgroup->hwif;
1593
1594 /*
1595 * handle the unexpected interrupt
1596 */
1597 do {
1598 if (hwif->irq == irq) {
1599 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1600 ide_drive_t *drive = &hwif->drives[unit];
1601 if (!drive->present)
1602 continue;
1603 SELECT_DRIVE(hwif,drive);
1604 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1605 (void) ide_dump_status(drive, "unexpected_intr", stat);
1606 if ((stat & DRQ_STAT))
1607 try_to_flush_leftover_data(drive);
1608 }
1609 }
1610 } while ((hwif = hwif->next) != hwgroup->hwif);
1611 SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1612 }
1613
1614 /*
1615 * entry point for all interrupts, caller does cli() for us
1616 */
1617 void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1618 {
1619 ide_hwgroup_t *hwgroup = dev_id;
1620 ide_handler_t *handler;
1621
1622 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1623 ide_drive_t *drive = hwgroup->drive;
1624 hwgroup->handler = NULL;
1625 del_timer(&(hwgroup->timer));
1626 if (drive->unmask)
1627 sti();
1628 handler(drive);
1629 cli(); /* this is necessary, as next rq may be different irq */
1630 if (hwgroup->handler == NULL) {
1631 SET_RECOVERY_TIMER(HWIF(drive));
1632 ide_do_request(hwgroup);
1633 }
1634 } else {
1635 unexpected_intr(irq, hwgroup);
1636 }
1637 cli();
1638 }
1639
1640 /*
1641 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1642 * It returns NULL if the given device number does not match any present drives.
1643 */
1644 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1645 {
1646 int major = MAJOR(i_rdev);
1647 unsigned int h;
1648
1649 for (h = 0; h < MAX_HWIFS; ++h) {
1650 ide_hwif_t *hwif = &ide_hwifs[h];
1651 if (hwif->present && major == hwif->major) {
1652 unsigned unit = DEVICE_NR(i_rdev);
1653 if (unit < MAX_DRIVES) {
1654 ide_drive_t *drive = &hwif->drives[unit];
1655 if (drive->present)
1656 return drive;
1657 } else if (major == IDE0_MAJOR && unit < 4) {
1658 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1659 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1660 }
1661 break;
1662 }
1663 }
1664 return NULL;
1665 }
1666
1667 /*
1668 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1669 */
1670 void ide_init_drive_cmd (struct request *rq)
/* */
1671 {
1672 rq->buffer = NULL;
1673 rq->cmd = IDE_DRIVE_CMD;
1674 rq->sector = 0;
1675 rq->nr_sectors = 0;
1676 rq->current_nr_sectors = 0;
1677 rq->sem = NULL;
1678 rq->bh = NULL;
1679 rq->bhtail = NULL;
1680 rq->next = NULL;
1681
1682 #if 0 /* these are done each time through ide_do_drive_cmd() */
1683 rq->errors = 0;
1684 rq->rq_status = RQ_ACTIVE;
1685 rq->rq_dev = ????;
1686 #endif
1687 }
1688
1689 /*
1690 * This function issues a special IDE device request
1691 * onto the request queue.
1692 *
1693 * If action is ide_wait, then then rq is queued at the end of
1694 * the request queue, and the function sleeps until it has been
1695 * processed. This is for use when invoked from an ioctl handler.
1696 *
1697 * If action is ide_preempt, then the rq is queued at the head of
1698 * the request queue, displacing the currently-being-processed
1699 * request and this function returns immediately without waiting
1700 * for the new rq to be completed. This is VERY DANGEROUS, and is
1701 * intended for careful use by the ATAPI tape/cdrom driver code.
1702 *
1703 * If action is ide_next, then the rq is queued immediately after
1704 * the currently-being-processed-request (if any), and the function
1705 * returns without waiting for the new rq to be completed. As above,
1706 * This is VERY DANGEROUS, and is intended for careful use by the
1707 * ATAPI tape/cdrom driver code.
1708 *
1709 * If action is ide_end, then the rq is queued at the end of the
1710 * request queue, and the function returns immediately without waiting
1711 * for the new rq to be completed. This is again intended for careful
1712 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1713 * when operating in the pipelined operation mode).
1714 */
1715 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1716 {
1717 unsigned long flags;
1718 unsigned int major = HWIF(drive)->major;
1719 struct request *cur_rq;
1720 struct blk_dev_struct *bdev = &blk_dev[major];
1721 struct semaphore sem = MUTEX_LOCKED;
1722
1723 if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1724 return -ENOSYS; /* special drive cmds not supported */
1725 rq->errors = 0;
1726 rq->rq_status = RQ_ACTIVE;
1727 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1728 if (action == ide_wait)
1729 rq->sem = &sem;
1730
1731 save_flags(flags);
1732 cli();
1733 if (action == ide_next)
1734 HWGROUP(drive)->next_hwif = HWIF(drive);
1735 cur_rq = bdev->current_request;
1736
1737 if (cur_rq == NULL || action == ide_preempt) {
1738 rq->next = cur_rq;
1739 bdev->current_request = rq;
1740 if (action == ide_preempt) {
1741 HWGROUP(drive)->rq = NULL;
1742 } else
1743 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1744 bdev->request_fn();
1745 cli();
1746 }
1747 } else {
1748 if (action == ide_wait || action == ide_end) {
1749 while (cur_rq->next != NULL) /* find end of list */
1750 cur_rq = cur_rq->next;
1751 }
1752 rq->next = cur_rq->next;
1753 cur_rq->next = rq;
1754 }
1755 if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1756 down(&sem); /* wait for it to be serviced */
1757 restore_flags(flags);
1758 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1759 }
1760
1761 static int ide_open(struct inode * inode, struct file * filp)
/* */
1762 {
1763 ide_drive_t *drive;
1764 unsigned long flags;
1765
1766 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1767 return -ENODEV;
1768 save_flags(flags);
1769 cli();
1770 while (drive->busy)
1771 sleep_on(&drive->wqueue);
1772 drive->usage++;
1773 restore_flags(flags);
1774 #ifdef CONFIG_BLK_DEV_IDECD
1775 if (drive->media == ide_cdrom)
1776 return ide_cdrom_open (inode, filp, drive);
1777 #endif /* CONFIG_BLK_DEV_IDECD */
1778 #ifdef CONFIG_BLK_DEV_IDETAPE
1779 if (drive->media == ide_tape)
1780 return idetape_blkdev_open (inode, filp, drive);
1781 #endif /* CONFIG_BLK_DEV_IDETAPE */
1782 if (drive->removeable) {
1783 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1784 struct request rq;
1785 check_disk_change(inode->i_rdev);
1786 ide_init_drive_cmd (&rq);
1787 rq.buffer = door_lock;
1788 /*
1789 * Ignore the return code from door_lock,
1790 * since the open() has already succeeded,
1791 * and the door_lock is irrelevant at this point.
1792 */
1793 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1794 }
1795 return 0;
1796 }
1797
1798 /*
1799 * Releasing a block device means we sync() it, so that it can safely
1800 * be forgotten about...
1801 */
1802 static void ide_release(struct inode * inode, struct file * file)
/* */
1803 {
1804 ide_drive_t *drive;
1805
1806 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1807 sync_dev(inode->i_rdev);
1808 drive->usage--;
1809 #ifdef CONFIG_BLK_DEV_IDECD
1810 if (drive->media == ide_cdrom) {
1811 ide_cdrom_release (inode, file, drive);
1812 return;
1813 }
1814 #endif /* CONFIG_BLK_DEV_IDECD */
1815 #ifdef CONFIG_BLK_DEV_IDETAPE
1816 if (drive->media == ide_tape) {
1817 idetape_blkdev_release (inode, file, drive);
1818 return;
1819 }
1820 #endif /* CONFIG_BLK_DEV_IDETAPE */
1821 if (drive->removeable) {
1822 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1823 struct request rq;
1824 invalidate_buffers(inode->i_rdev);
1825 ide_init_drive_cmd (&rq);
1826 rq.buffer = door_unlock;
1827 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1828 }
1829 }
1830 }
1831
1832 /*
1833 * This routine is called to flush all partitions and partition tables
1834 * for a changed disk, and then re-read the new partition table.
1835 * If we are revalidating a disk because of a media change, then we
1836 * enter with usage == 0. If we are using an ioctl, we automatically have
1837 * usage == 1 (we need an open channel to use an ioctl :-), so this
1838 * is our limit.
1839 */
1840 static int revalidate_disk(kdev_t i_rdev)
/* */
1841 {
1842 ide_drive_t *drive;
1843 unsigned int p, major, minor;
1844 long flags;
1845
1846 if ((drive = get_info_ptr(i_rdev)) == NULL)
1847 return -ENODEV;
1848
1849 major = MAJOR(i_rdev);
1850 minor = drive->select.b.unit << PARTN_BITS;
1851 save_flags(flags);
1852 cli();
1853 if (drive->busy || (drive->usage > 1)) {
1854 restore_flags(flags);
1855 return -EBUSY;
1856 };
1857 drive->busy = 1;
1858 restore_flags(flags);
1859
1860 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1861 if (drive->part[p].nr_sects > 0) {
1862 kdev_t devp = MKDEV(major, minor+p);
1863 sync_dev (devp);
1864 invalidate_inodes (devp);
1865 invalidate_buffers (devp);
1866 }
1867 drive->part[p].start_sect = 0;
1868 drive->part[p].nr_sects = 0;
1869 };
1870
1871 drive->part[0].nr_sects = current_capacity(drive);
1872 if (drive->media == ide_disk)
1873 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1874
1875 drive->busy = 0;
1876 wake_up(&drive->wqueue);
1877 return 0;
1878 }
1879
1880 static int write_fs_long (unsigned long useraddr, long value)
/* */
1881 {
1882 int err;
1883
1884 if (NULL == (long *)useraddr)
1885 return -EINVAL;
1886 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1887 return err;
1888 put_user((unsigned)value, (long *) useraddr);
1889 return 0;
1890 }
1891
1892 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1893 unsigned int cmd, unsigned long arg)
1894 {
1895 int err;
1896 ide_drive_t *drive;
1897 unsigned long flags;
1898 struct request rq;
1899
1900 if (!inode || !(inode->i_rdev))
1901 return -EINVAL;
1902 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1903 return -ENODEV;
1904 ide_init_drive_cmd (&rq);
1905 switch (cmd) {
1906 case HDIO_GETGEO:
1907 {
1908 struct hd_geometry *loc = (struct hd_geometry *) arg;
1909 if (!loc || drive->media != ide_disk) return -EINVAL;
1910 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1911 if (err) return err;
1912 put_user(drive->bios_head, (byte *) &loc->heads);
1913 put_user(drive->bios_sect, (byte *) &loc->sectors);
1914 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1915 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1916 (unsigned long *) &loc->start);
1917 return 0;
1918 }
1919 case BLKFLSBUF:
1920 if (!suser()) return -EACCES;
1921 fsync_dev(inode->i_rdev);
1922 invalidate_buffers(inode->i_rdev);
1923 return 0;
1924
1925 case BLKRASET:
1926 if (!suser()) return -EACCES;
1927 if(arg > 0xff) return -EINVAL;
1928 read_ahead[MAJOR(inode->i_rdev)] = arg;
1929 return 0;
1930
1931 case BLKRAGET:
1932 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1933
1934 case BLKGETSIZE: /* Return device size */
1935 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1936 case BLKRRPART: /* Re-read partition tables */
1937 if (!suser()) return -EACCES;
1938 return revalidate_disk(inode->i_rdev);
1939
1940 case HDIO_GET_KEEPSETTINGS:
1941 return write_fs_long(arg, drive->keep_settings);
1942
1943 case HDIO_GET_UNMASKINTR:
1944 return write_fs_long(arg, drive->unmask);
1945
1946 case HDIO_GET_DMA:
1947 return write_fs_long(arg, drive->using_dma);
1948
1949 case HDIO_GET_32BIT:
1950 return write_fs_long(arg, drive->io_32bit);
1951
1952 case HDIO_GET_MULTCOUNT:
1953 return write_fs_long(arg, drive->mult_count);
1954
1955 case HDIO_GET_IDENTITY:
1956 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1957 return -EINVAL;
1958 if (drive->id == NULL)
1959 return -ENOMSG;
1960 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1961 if (!err)
1962 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1963 return err;
1964
1965 case HDIO_GET_NOWERR:
1966 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1967
1968 case HDIO_SET_DMA:
1969 if (!suser()) return -EACCES;
1970 #ifdef CONFIG_BLK_DEV_IDECD
1971 if (drive->media == ide_cdrom)
1972 return -EPERM;
1973 #endif /* CONFIG_BLK_DEV_IDECD */
1974 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1975 return -EPERM;
1976 case HDIO_SET_KEEPSETTINGS:
1977 case HDIO_SET_UNMASKINTR:
1978 case HDIO_SET_NOWERR:
1979 if (arg > 1)
1980 return -EINVAL;
1981 case HDIO_SET_32BIT:
1982 if (!suser()) return -EACCES;
1983 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1984 return -EINVAL;
1985 save_flags(flags);
1986 cli();
1987 switch (cmd) {
1988 case HDIO_SET_DMA:
1989 if (!(HWIF(drive)->dmaproc)) {
1990 restore_flags(flags);
1991 return -EPERM;
1992 }
1993 drive->using_dma = arg;
1994 break;
1995 case HDIO_SET_KEEPSETTINGS:
1996 drive->keep_settings = arg;
1997 break;
1998 case HDIO_SET_UNMASKINTR:
1999 if (arg && HWIF(drive)->no_unmask) {
2000 restore_flags(flags);
2001 return -EPERM;
2002 }
2003 drive->unmask = arg;
2004 break;
2005 case HDIO_SET_NOWERR:
2006 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2007 break;
2008 case HDIO_SET_32BIT:
2009 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
2010 return -EINVAL;
2011 drive->io_32bit = arg;
2012 #ifdef CONFIG_BLK_DEV_DTC2278
2013 if (HWIF(drive)->chipset == ide_dtc2278)
2014 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2015 #endif /* CONFIG_BLK_DEV_DTC2278 */
2016 break;
2017 }
2018 restore_flags(flags);
2019 return 0;
2020
2021 case HDIO_SET_MULTCOUNT:
2022 if (!suser()) return -EACCES;
2023 if (MINOR(inode->i_rdev) & PARTN_MASK)
2024 return -EINVAL;
2025 if (drive->id && arg > drive->id->max_multsect)
2026 return -EINVAL;
2027 save_flags(flags);
2028 cli();
2029 if (drive->special.b.set_multmode) {
2030 restore_flags(flags);
2031 return -EBUSY;
2032 }
2033 drive->mult_req = arg;
2034 drive->special.b.set_multmode = 1;
2035 restore_flags(flags);
2036 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2037 return (drive->mult_count == arg) ? 0 : -EIO;
2038
2039 case HDIO_DRIVE_CMD:
2040 {
2041 byte args[4], *argbuf = args;
2042 int argsize = 4;
2043 if (!suser()) return -EACCES;
2044 if (NULL == (void *) arg) {
2045 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2046 } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2047 memcpy_fromfs(args, (void *)arg, 4);
2048 if (args[3]) {
2049 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2050 argbuf = kmalloc(argsize, GFP_KERNEL);
2051 if (argbuf == NULL)
2052 return -ENOMEM;
2053 argbuf[0] = args[0];
2054 argbuf[1] = args[1];
2055 argbuf[2] = args[2];
2056 argbuf[3] = args[3];
2057 }
2058 if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2059 rq.buffer = argbuf;
2060 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2061 memcpy_tofs((void *)arg, argbuf, argsize);
2062 }
2063 if (argsize > 4)
2064 kfree(argbuf);
2065 }
2066 return err;
2067 }
2068 case HDIO_SET_PIO_MODE:
2069 if (!suser()) return -EACCES;
2070 if (MINOR(inode->i_rdev) & PARTN_MASK)
2071 return -EINVAL;
2072 if (!HWIF(drive)->tuneproc)
2073 return -ENOSYS;
2074 save_flags(flags);
2075 cli();
2076 drive->pio_req = (int) arg;
2077 drive->special.b.set_pio = 1;
2078 restore_flags(flags);
2079 return 0;
2080
2081 RO_IOCTLS(inode->i_rdev, arg);
2082
2083 default:
2084 #ifdef CONFIG_BLK_DEV_IDECD
2085 if (drive->media == ide_cdrom)
2086 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2087 #endif /* CONFIG_BLK_DEV_IDECD */
2088 #ifdef CONFIG_BLK_DEV_IDETAPE
2089 if (drive->media == ide_tape)
2090 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2091 #endif /* CONFIG_BLK_DEV_IDETAPE */
2092 return -EPERM;
2093 }
2094 }
2095
2096 static int ide_check_media_change (kdev_t i_rdev)
/* */
2097 {
2098 ide_drive_t *drive;
2099
2100 if ((drive = get_info_ptr(i_rdev)) == NULL)
2101 return -ENODEV;
2102 #ifdef CONFIG_BLK_DEV_IDECD
2103 if (drive->media == ide_cdrom)
2104 return ide_cdrom_check_media_change (drive);
2105 #endif /* CONFIG_BLK_DEV_IDECD */
2106 if (drive->removeable) /* for disks */
2107 return 1; /* always assume it was changed */
2108 return 0;
2109 }
2110
2111 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2112 {
2113 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2114
2115 if (byteswap) {
2116 /* convert from big-endian to host byte order */
2117 for (p = end ; p != s;) {
2118 unsigned short *pp = (unsigned short *) (p -= 2);
2119 *pp = ntohs(*pp);
2120 }
2121 }
2122
2123 /* strip leading blanks */
2124 while (s != end && *s == ' ')
2125 ++s;
2126
2127 /* compress internal blanks and strip trailing blanks */
2128 while (s != end && *s) {
2129 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2130 *p++ = *(s-1);
2131 }
2132
2133 /* wipe out trailing garbage */
2134 while (p != end)
2135 *p++ = '\0';
2136 }
2137
2138 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2139 {
2140 int bswap;
2141 struct hd_driveid *id;
2142 unsigned long capacity, check;
2143
2144 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2145 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2146 sti();
2147
2148 /*
2149 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2150 */
2151 if ((id->model[0] == 'P' && id->model[1] == 'M')
2152 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2153 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2154 drive->present = 0;
2155 return;
2156 }
2157
2158 /*
2159 * WIN_IDENTIFY returns little-endian info,
2160 * WIN_PIDENTIFY *usually* returns little-endian info.
2161 */
2162 bswap = 1;
2163 if (cmd == WIN_PIDENTIFY) {
2164 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2165 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2166 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2167 bswap = 0; /* Vertos drives may still be weird */
2168 }
2169 ide_fixstring (id->model, sizeof(id->model), bswap);
2170 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2171 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2172
2173 #ifdef CONFIG_BLK_DEV_IDEATAPI
2174 /*
2175 * Check for an ATAPI device
2176 */
2177 if (cmd == WIN_PIDENTIFY) {
2178 byte type = (id->config >> 8) & 0x1f;
2179 printk("%s: %s, ATAPI ", drive->name, id->model);
2180 #ifdef CONFIG_BLK_DEV_PROMISE
2181 if (HWIF(drive)->is_promise2) {
2182 printk(" -- not supported on 2nd Promise port\n");
2183 drive->present = 0;
2184 return;
2185 }
2186 #endif /* CONFIG_BLK_DEV_PROMISE */
2187 switch (type) {
2188 case 0: /* Early cdrom models used zero */
2189 case 5:
2190 #ifdef CONFIG_BLK_DEV_IDECD
2191 printk ("CDROM drive\n");
2192 drive->media = ide_cdrom;
2193 drive->present = 1;
2194 drive->removeable = 1;
2195 return;
2196 #else
2197 printk ("CDROM ");
2198 break;
2199 #endif /* CONFIG_BLK_DEV_IDECD */
2200 case 1:
2201 #ifdef CONFIG_BLK_DEV_IDETAPE
2202 printk ("TAPE drive");
2203 if (idetape_identify_device (drive,id)) {
2204 drive->media = ide_tape;
2205 drive->present = 1;
2206 drive->removeable = 1;
2207 if (HWIF(drive)->dmaproc != NULL &&
2208 !HWIF(drive)->dmaproc(ide_dma_check, drive))
2209 printk(", DMA");
2210 printk("\n");
2211 }
2212 else {
2213 drive->present = 0;
2214 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2215 }
2216 return;
2217 #else
2218 printk ("TAPE ");
2219 break;
2220 #endif /* CONFIG_BLK_DEV_IDETAPE */
2221 default:
2222 drive->present = 0;
2223 printk("Type %d - Unknown device\n", type);
2224 return;
2225 }
2226 drive->present = 0;
2227 printk("- not supported by this kernel\n");
2228 return;
2229 }
2230 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2231
2232 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2233 if (id->config & (1<<7)) { /* removeable disk ? */
2234 if (id->model[0] != 'W' || id->model[1] != 'D')
2235 drive->removeable = 1;
2236 }
2237
2238 /* SunDisk drives: treat as non-removeable, force one unit */
2239 if (id->model[0] == 'S' && id->model[1] == 'u') {
2240 drive->removeable = 0;
2241 if (drive->select.all & (1<<4)) {
2242 drive->present = 0;
2243 return;
2244 }
2245 }
2246
2247 drive->media = ide_disk;
2248 /* Extract geometry if we did not already have one for the drive */
2249 if (!drive->present) {
2250 drive->present = 1;
2251 drive->cyl = drive->bios_cyl = id->cyls;
2252 drive->head = drive->bios_head = id->heads;
2253 drive->sect = drive->bios_sect = id->sectors;
2254 }
2255 /* Handle logical geometry translation by the drive */
2256 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2257 && (id->cur_heads <= 16) && id->cur_sectors)
2258 {
2259 /*
2260 * Extract the physical drive geometry for our use.
2261 * Note that we purposely do *not* update the bios info.
2262 * This way, programs that use it (like fdisk) will
2263 * still have the same logical view as the BIOS does,
2264 * which keeps the partition table from being screwed.
2265 *
2266 * An exception to this is the cylinder count,
2267 * which we reexamine later on to correct for 1024 limitations.
2268 */
2269 drive->cyl = id->cur_cyls;
2270 drive->head = id->cur_heads;
2271 drive->sect = id->cur_sectors;
2272
2273 /* check for word-swapped "capacity" field in id information */
2274 capacity = drive->cyl * drive->head * drive->sect;
2275 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2276 if (check == capacity) { /* was it swapped? */
2277 /* yes, bring it into little-endian order: */
2278 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2279 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2280 }
2281 }
2282 /* Use physical geometry if what we have still makes no sense */
2283 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2284 drive->cyl = id->cyls;
2285 drive->head = id->heads;
2286 drive->sect = id->sectors;
2287 }
2288 /* Correct the number of cyls if the bios value is too small */
2289 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2290 if (drive->cyl > drive->bios_cyl)
2291 drive->bios_cyl = drive->cyl;
2292 }
2293
2294 (void) current_capacity (drive); /* initialize LBA selection */
2295
2296 printk ("%s: %.40s, %ldMB w/%dkB Cache, %sCHS=%d/%d/%d",
2297 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2298 drive->select.b.lba ? "LBA, " : "",
2299 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2300
2301 drive->mult_count = 0;
2302 if (id->max_multsect) {
2303 drive->mult_req = INITIAL_MULT_COUNT;
2304 if (drive->mult_req > id->max_multsect)
2305 drive->mult_req = id->max_multsect;
2306 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2307 drive->special.b.set_multmode = 1;
2308 }
2309 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2310 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2311 printk(", DMA");
2312 }
2313 printk("\n");
2314 }
2315
2316 /*
2317 * Delay for *at least* 10ms. As we don't know how much time is left
2318 * until the next tick occurs, we wait an extra tick to be safe.
2319 * This is used only during the probing/polling for drives at boot time.
2320 */
2321 static void delay_10ms (void)
/* */
2322 {
2323 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2324 while (timer > jiffies);
2325 }
2326
2327 /*
2328 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2329 * and waits for a response. It also monitors irqs while this is
2330 * happening, in hope of automatically determining which one is
2331 * being used by the interface.
2332 *
2333 * Returns: 0 device was identified
2334 * 1 device timed-out (no response to identify request)
2335 * 2 device aborted the command (refused to identify itself)
2336 */
2337 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2338 {
2339 int hd_status, rc;
2340 unsigned long timeout;
2341 int irqs = 0;
2342
2343 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2344 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2345 irqs = probe_irq_on(); /* start monitoring irqs */
2346 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2347 }
2348
2349 delay_10ms(); /* take a deep breath */
2350 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2351 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2352 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2353 } else
2354 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2355
2356 #if CONFIG_BLK_DEV_PROMISE
2357 if (IS_PROMISE_DRIVE) {
2358 if(promise_cmd(drive,PROMISE_IDENTIFY))
2359 return 1;
2360 } else
2361 #endif /* CONFIG_BLK_DEV_PROMISE */
2362 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2363 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2364 timeout += jiffies;
2365 do {
2366 if (jiffies > timeout) {
2367 if (!HWIF(drive)->irq)
2368 (void) probe_irq_off(irqs);
2369 return 1; /* drive timed-out */
2370 }
2371 delay_10ms(); /* give drive a breather */
2372 } while (IN_BYTE(hd_status) & BUSY_STAT);
2373
2374 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2375 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2376 cli(); /* some systems need this */
2377 do_identify(drive, cmd); /* drive returned ID */
2378 if (drive->present && drive->media != ide_tape) {
2379 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2380 if (tuneproc != NULL && drive->autotune == 1)
2381 tuneproc(drive, 255); /* auto-tune PIO mode */
2382 }
2383 rc = 0; /* drive responded with ID */
2384 } else
2385 rc = 2; /* drive refused ID */
2386 if (!HWIF(drive)->irq) {
2387 irqs = probe_irq_off(irqs); /* get irq number */
2388 if (irqs > 0)
2389 HWIF(drive)->irq = irqs;
2390 else /* Mmmm.. multiple IRQs */
2391 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2392 }
2393 return rc;
2394 }
2395
2396 /*
2397 * do_probe() has the difficult job of finding a drive if it exists,
2398 * without getting hung up if it doesn't exist, without trampling on
2399 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2400 *
2401 * If a drive is "known" to exist (from CMOS or kernel parameters),
2402 * but does not respond right away, the probe will "hang in there"
2403 * for the maximum wait time (about 30 seconds), otherwise it will
2404 * exit much more quickly.
2405 *
2406 * Returns: 0 device was identified
2407 * 1 device timed-out (no response to identify request)
2408 * 2 device aborted the command (refused to identify itself)
2409 * 3 bad status from device (possible for ATAPI drives)
2410 * 4 probe was not attempted because failure was obvious
2411 */
2412 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2413 {
2414 int rc;
2415 ide_hwif_t *hwif;
2416 #ifdef CONFIG_BLK_DEV_IDEATAPI
2417 if (drive->present) { /* avoid waiting for inappropriate probes */
2418 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2419 return 4;
2420 }
2421 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2422 #ifdef DEBUG
2423 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2424 drive->name, drive->present, drive->media,
2425 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2426 #endif
2427 hwif = HWIF(drive);
2428 SELECT_DRIVE(hwif,drive);
2429 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2430 delay_10ms(); /* wait for BUSY_STAT */
2431 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2432 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2433 return 3; /* no i/f present: avoid killing ethernet cards */
2434 }
2435
2436 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2437 || drive->present || cmd == WIN_PIDENTIFY)
2438 {
2439 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2440 rc = try_to_identify(drive,cmd); /* failed: try again */
2441 if (rc == 1)
2442 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2443 (void) GET_STAT(); /* ensure drive irq is clear */
2444 } else {
2445 rc = 3; /* not present or maybe ATAPI */
2446 }
2447 if (drive->select.b.unit != 0) {
2448 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2449 delay_10ms();
2450 (void) GET_STAT(); /* ensure drive irq is clear */
2451 }
2452 return rc;
2453 }
2454
2455 /*
2456 * probe_for_drive() tests for existance of a given drive using do_probe().
2457 *
2458 * Returns: 0 no device was found
2459 * 1 device was found (note: drive->present might still be 0)
2460 */
2461 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2462 {
2463 if (drive->noprobe) /* skip probing? */
2464 return drive->present;
2465 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2466 #ifdef CONFIG_BLK_DEV_IDEATAPI
2467 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2468 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2469 }
2470 if (!drive->present)
2471 return 0; /* drive not found */
2472 if (drive->id == NULL) { /* identification failed? */
2473 if (drive->media == ide_disk) {
2474 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2475 drive->name, drive->cyl, drive->head, drive->sect);
2476 }
2477 #ifdef CONFIG_BLK_DEV_IDECD
2478 else if (drive->media == ide_cdrom) {
2479 printk("%s: ATAPI cdrom (?)\n", drive->name);
2480 }
2481 #endif /* CONFIG_BLK_DEV_IDECD */
2482 else {
2483 drive->present = 0; /* nuke it */
2484 }
2485 }
2486 return 1; /* drive was found */
2487 }
2488
2489 /*
2490 * This routine only knows how to look for drive units 0 and 1
2491 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2492 */
2493 static void probe_hwif (ide_hwif_t *hwif)
/* */
2494 {
2495 unsigned int unit;
2496
2497 #if CONFIG_BLK_DEV_PROMISE
2498 if (!hwif->is_promise2 &&
2499 (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2500 #else
2501 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2502 #endif /* CONFIG_BLK_DEV_PROMISE */
2503 int msgout = 0;
2504 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2505 ide_drive_t *drive = &hwif->drives[unit];
2506 if (drive->present) {
2507 drive->present = 0;
2508 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2509 msgout = 1;
2510 }
2511 }
2512 if (!msgout)
2513 printk("%s: ports already in use, skipping probe\n", hwif->name);
2514 } else {
2515 unsigned long flags;
2516 save_flags(flags);
2517
2518 sti(); /* needed for jiffies and irq probing */
2519 /*
2520 * Second drive should only exist if first drive was found,
2521 * but a lot of cdrom drives are configured as single slaves.
2522 */
2523 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2524 ide_drive_t *drive = &hwif->drives[unit];
2525 (void) probe_for_drive (drive);
2526 if (drive->present && drive->media == ide_disk) {
2527 if (IS_PROMISE_DRIVE)
2528 drive->select.b.lba = 1; /* required by promise driver */
2529 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2530 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2531 drive->name, drive->head);
2532 drive->present = 0;
2533 }
2534 }
2535 if (drive->present && !hwif->present) {
2536 hwif->present = 1;
2537 request_region(hwif->io_base, 8, hwif->name);
2538 request_region(hwif->ctl_port, 1, hwif->name);
2539 }
2540 }
2541 restore_flags(flags);
2542 }
2543 }
2544
2545 /*
2546 * stridx() returns the offset of c within s,
2547 * or -1 if c is '\0' or not found within s.
2548 */
2549 static int stridx (const char *s, char c)
/* */
2550 {
2551 char *i = strchr(s, c);
2552 return (i && c) ? i - s : -1;
2553 }
2554
2555 /*
2556 * match_parm() does parsing for ide_setup():
2557 *
2558 * 1. the first char of s must be '='.
2559 * 2. if the remainder matches one of the supplied keywords,
2560 * the index (1 based) of the keyword is negated and returned.
2561 * 3. if the remainder is a series of no more than max_vals numbers
2562 * separated by commas, the numbers are saved in vals[] and a
2563 * count of how many were saved is returned. Base10 is assumed,
2564 * and base16 is allowed when prefixed with "0x".
2565 * 4. otherwise, zero is returned.
2566 */
2567 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2568 {
2569 static const char *decimal = "0123456789";
2570 static const char *hex = "0123456789abcdef";
2571 int i, n;
2572
2573 if (*s++ == '=') {
2574 /*
2575 * Try matching against the supplied keywords,
2576 * and return -(index+1) if we match one
2577 */
2578 for (i = 0; *keywords != NULL; ++i) {
2579 if (!strcmp(s, *keywords++))
2580 return -(i+1);
2581 }
2582 /*
2583 * Look for a series of no more than "max_vals"
2584 * numeric values separated by commas, in base10,
2585 * or base16 when prefixed with "0x".
2586 * Return a count of how many were found.
2587 */
2588 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2589 vals[n] = i;
2590 while ((i = stridx(decimal, *++s)) >= 0)
2591 vals[n] = (vals[n] * 10) + i;
2592 if (*s == 'x' && !vals[n]) {
2593 while ((i = stridx(hex, *++s)) >= 0)
2594 vals[n] = (vals[n] * 0x10) + i;
2595 }
2596 if (++n == max_vals)
2597 break;
2598 if (*s == ',')
2599 ++s;
2600 }
2601 if (!*s)
2602 return n;
2603 }
2604 return 0; /* zero = nothing matched */
2605 }
2606
2607 /*
2608 * ide_setup() gets called VERY EARLY during initialization,
2609 * to handle kernel "command line" strings beginning with "hdx="
2610 * or "ide". Here is the complete set currently supported:
2611 *
2612 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2613 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2614 *
2615 * "hdx=noprobe" : drive may be present, but do not probe for it
2616 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2617 * "hdx=cdrom" : drive is present, and is a cdrom drive
2618 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2619 * "hdx=autotune" : driver will attempt to tune interface speed
2620 * to the fastest PIO mode supported,
2621 * if possible for this drive only.
2622 * Not fully supported by all chipset types,
2623 * and quite likely to cause trouble with
2624 * older/odd IDE drives.
2625 *
2626 * "idex=noprobe" : do not attempt to access/use this interface
2627 * "idex=base" : probe for an interface at the addr specified,
2628 * where "base" is usually 0x1f0 or 0x170
2629 * and "ctl" is assumed to be "base"+0x206
2630 * "idex=base,ctl" : specify both base and ctl
2631 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2632 * "idex=autotune" : driver will attempt to tune interface speed
2633 * to the fastest PIO mode supported,
2634 * for all drives on this interface.
2635 * Not fully supported by all chipset types,
2636 * and quite likely to cause trouble with
2637 * older/odd IDE drives.
2638 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2639 * This is the default for most chipsets,
2640 * except the cmd640.
2641 * "idex=serialize" : do not overlap operations on idex and ide(x^1)
2642 *
2643 * The following two are valid ONLY on ide0,
2644 * and the defaults for the base,ctl ports must not be altered.
2645 *
2646 * "ide0=dtc2278" : probe/support DTC2278 interface
2647 * "ide0=ht6560b" : probe/support HT6560B interface
2648 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2649 * (not for PCI -- automatically detected)
2650 * "ide0=qd6580" : probe/support qd6580 interface
2651 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2652 * "ide0=umc8672" : probe/support umc8672 chipsets
2653 */
2654 void ide_setup (char *s)
/* */
2655 {
2656 int i, vals[3];
2657 ide_hwif_t *hwif;
2658 ide_drive_t *drive;
2659 unsigned int hw, unit;
2660 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2661 const char max_hwif = '0' + (MAX_HWIFS - 1);
2662
2663 printk("ide_setup: %s", s);
2664 init_ide_data ();
2665
2666 /*
2667 * Look for drive options: "hdx="
2668 */
2669 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2670 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2671 "autotune", "noautotune", NULL};
2672 unit = s[2] - 'a';
2673 hw = unit / MAX_DRIVES;
2674 unit = unit % MAX_DRIVES;
2675 hwif = &ide_hwifs[hw];
2676 drive = &hwif->drives[unit];
2677 switch (match_parm(&s[3], hd_words, vals, 3)) {
2678 case -1: /* "noprobe" */
2679 drive->noprobe = 1;
2680 goto done;
2681 case -2: /* "nowerr" */
2682 drive->bad_wstat = BAD_R_STAT;
2683 hwif->noprobe = 0;
2684 goto done;
2685 case -3: /* "cdrom" */
2686 drive->present = 1;
2687 drive->media = ide_cdrom;
2688 hwif->noprobe = 0;
2689 goto done;
2690 case -4: /* "serialize" */
2691 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
2692 goto do_serialize;
2693 case -5: /* "autotune" */
2694 drive->autotune = 1;
2695 goto done;
2696 case -6: /* "noautotune" */
2697 drive->autotune = 2;
2698 goto done;
2699 case 3: /* cyl,head,sect */
2700 drive->media = ide_disk;
2701 drive->cyl = drive->bios_cyl = vals[0];
2702 drive->head = drive->bios_head = vals[1];
2703 drive->sect = drive->bios_sect = vals[2];
2704 drive->present = 1;
2705 drive->forced_geom = 1;
2706 hwif->noprobe = 0;
2707 goto done;
2708 default:
2709 goto bad_option;
2710 }
2711 }
2712 /*
2713 * Look for interface options: "idex="
2714 */
2715 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2716 /*
2717 * Be VERY CAREFUL changing this: note hardcoded indexes below
2718 */
2719 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2720 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
2721 hw = s[3] - '0';
2722 hwif = &ide_hwifs[hw];
2723 i = match_parm(&s[4], ide_words, vals, 3);
2724
2725 /*
2726 * Cryptic check to ensure chipset not already set for hwif:
2727 */
2728 if (i != -1 && i != -2) {
2729 if (hwif->chipset != ide_unknown)
2730 goto bad_option;
2731 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2732 goto bad_option;
2733 }
2734 /*
2735 * Interface keywords work only for ide0:
2736 */
2737 if (i <= -6 && hw != 0)
2738 goto bad_hwif;
2739
2740 switch (i) {
2741 #ifdef CONFIG_BLK_DEV_PROMISE
2742 case -11: /* "dc4030" */
2743 {
2744 setup_dc4030(hwif);
2745 goto done;
2746 }
2747 #endif /* CONFIG_BLK_DEV_PROMISE */
2748 #ifdef CONFIG_BLK_DEV_ALI14XX
2749 case -10: /* "ali14xx" */
2750 {
2751 extern void init_ali14xx (void);
2752 init_ali14xx();
2753 goto done;
2754 }
2755 #endif /* CONFIG_BLK_DEV_ALI14XX */
2756 #ifdef CONFIG_BLK_DEV_UMC8672
2757 case -9: /* "umc8672" */
2758 {
2759 extern void init_umc8672 (void);
2760 init_umc8672();
2761 goto done;
2762 }
2763 #endif /* CONFIG_BLK_DEV_UMC8672 */
2764 #ifdef CONFIG_BLK_DEV_DTC2278
2765 case -8: /* "dtc2278" */
2766 {
2767 extern void init_dtc2278 (void);
2768 init_dtc2278();
2769 goto done;
2770 }
2771 #endif /* CONFIG_BLK_DEV_DTC2278 */
2772 #ifdef CONFIG_BLK_DEV_CMD640
2773 case -7: /* "cmd640_vlb" */
2774 {
2775 extern int cmd640_vlb; /* flag for cmd640.c */
2776 cmd640_vlb = 1;
2777 goto done;
2778 }
2779 #endif /* CONFIG_BLK_DEV_CMD640 */
2780 #ifdef CONFIG_BLK_DEV_HT6560B
2781 case -6: /* "ht6560b" */
2782 {
2783 extern void init_ht6560b (void);
2784 init_ht6560b();
2785 goto done;
2786 }
2787 #endif /* CONFIG_BLK_DEV_HT6560B */
2788 #if CONFIG_BLK_DEV_QD6580
2789 case -5: /* "qd6580" (no secondary i/f) */
2790 {
2791 extern void init_qd6580 (void);
2792 init_qd6580();
2793 goto done;
2794 }
2795 #endif /* CONFIG_BLK_DEV_QD6580 */
2796 case -4: /* "noautotune" */
2797 hwif->drives[0].autotune = 2;
2798 hwif->drives[1].autotune = 2;
2799 goto done;
2800 case -3: /* "autotune" */
2801 hwif->drives[0].autotune = 1;
2802 hwif->drives[1].autotune = 1;
2803 goto done;
2804 case -2: /* "serialize" */
2805 do_serialize:
2806 ide_hwifs[hw].serialized = 1; /* serialize */
2807 ide_hwifs[hw^1].serialized = 1; /* with mate */
2808 goto done;
2809
2810 case -1: /* "noprobe" */
2811 hwif->noprobe = 1;
2812 goto done;
2813
2814 case 1: /* base */
2815 vals[1] = vals[0] + 0x206; /* default ctl */
2816 case 2: /* base,ctl */
2817 vals[2] = 0; /* default irq = probe for it */
2818 case 3: /* base,ctl,irq */
2819 hwif->io_base = vals[0];
2820 hwif->ctl_port = vals[1];
2821 hwif->irq = vals[2];
2822 hwif->noprobe = 0;
2823 hwif->chipset = ide_generic;
2824 goto done;
2825
2826 case 0: goto bad_option;
2827 default:
2828 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2829 return;
2830 }
2831 }
2832 bad_option:
2833 printk(" -- BAD OPTION\n");
2834 return;
2835 bad_hwif:
2836 printk("-- NOT SUPPORTED ON ide%d", hw);
2837 done:
2838 printk("\n");
2839 }
2840
2841 /*
2842 * This routine is called from the partition-table code in genhd.c
2843 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2844 *
2845 * The second parameter, "xparm", determines exactly how the translation
2846 * will be handled:
2847 * 0 = convert to CHS with fewer than 1024 cyls
2848 * using the same method as Ontrack DiskManager.
2849 * 1 = same as "0", plus offset everything by 63 sectors.
2850 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2851 * >1 = convert to a CHS geometry with "xparm" heads.
2852 *
2853 * Returns 0 if the translation was not possible, if the device was not
2854 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2855 * Returns 1 if the geometry translation was successful.
2856 */
2857 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2858 {
2859 ide_drive_t *drive;
2860 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2861 const byte *heads = head_vals;
2862 unsigned long tracks;
2863
2864 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2865 return 0;
2866
2867 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2868 return 0; /* we already have a translation */
2869
2870 printk("%s ", msg);
2871
2872 if (drive->id) {
2873 drive->cyl = drive->id->cyls;
2874 drive->head = drive->id->heads;
2875 drive->sect = drive->id->sectors;
2876 }
2877 drive->bios_cyl = drive->cyl;
2878 drive->bios_head = drive->head;
2879 drive->bios_sect = drive->sect;
2880 drive->special.b.set_geometry = 1;
2881
2882 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2883 drive->bios_sect = 63;
2884 if (xparm > 1) {
2885 drive->bios_head = xparm;
2886 drive->bios_cyl = tracks / drive->bios_head;
2887 } else {
2888 while (drive->bios_cyl >= 1024) {
2889 drive->bios_head = *heads;
2890 drive->bios_cyl = tracks / drive->bios_head;
2891 if (0 == *++heads)
2892 break;
2893 }
2894 #if FAKE_FDISK_FOR_EZDRIVE
2895 if (xparm == -1) {
2896 drive->remap_0_to_1 = 1;
2897 msg = "0->1";
2898 } else
2899 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2900 if (xparm == 1) {
2901 drive->sect0 = 63;
2902 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2903 msg = "+63";
2904 }
2905 printk("[remap %s] ", msg);
2906 }
2907 drive->part[0].nr_sects = current_capacity(drive);
2908 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2909 return 1;
2910 }
2911
2912 /*
2913 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2914 * controller that is BIOS compatible with ST-506, and thus showing up in our
2915 * BIOS table, but not register compatible, and therefore not present in CMOS.
2916 *
2917 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2918 * drives in the system -- the ones reflected as drive 1 or 2. The first
2919 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2920 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2921 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2922 * means we have an AT controller hard disk for that drive.
2923 *
2924 * Of course, there is no guarantee that either drive is actually on the
2925 * "primary" IDE interface, but we don't bother trying to sort that out here.
2926 * If a drive is not actually on the primary interface, then these parameters
2927 * will be ignored. This results in the user having to supply the logical
2928 * drive geometry as a boot parameter for each drive not on the primary i/f.
2929 *
2930 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2931 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2932 * for us during initialization. I have the necessary docs -- any takers? -ml
2933 */
2934
2935 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2936 {
2937 #ifdef __i386__
2938 extern struct drive_info_struct drive_info;
2939 byte cmos_disks, *BIOS = (byte *) &drive_info;
2940 int unit;
2941
2942 #ifdef CONFIG_BLK_DEV_PROMISE
2943 if (hwif->is_promise2)
2944 return;
2945 #endif /* CONFIG_BLK_DEV_PROMISE */
2946 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2947 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2948 /* Extract drive geometry from CMOS+BIOS if not already setup */
2949 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2950 ide_drive_t *drive = &hwif->drives[unit];
2951 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2952 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2953 drive->head = drive->bios_head = *(BIOS+2);
2954 drive->sect = drive->bios_sect = *(BIOS+14);
2955 drive->ctl = *(BIOS+8);
2956 drive->present = 1;
2957 }
2958 BIOS += 16;
2959 }
2960 #endif
2961 }
2962
2963 /*
2964 * This routine sets up the irq for an ide interface, and creates a new
2965 * hwgroup for the irq/hwif if none was previously assigned.
2966 *
2967 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2968 * interrupts completely disabled. This can be bad for interrupt latency,
2969 * but anything else has led to problems on some machines. We re-enable
2970 * interrupts as much as we can safely do in most places.
2971 */
2972 static int init_irq (ide_hwif_t *hwif)
/* */
2973 {
2974 unsigned long flags;
2975 ide_hwgroup_t *hwgroup = hwif->hwgroup;
2976 ide_hwif_t *mate_hwif;
2977 unsigned int index, mate_irq = hwif->irq;
2978
2979 save_flags(flags);
2980 cli();
2981
2982 /*
2983 * Handle serialization, regardless of init sequence
2984 */
2985 mate_hwif = &ide_hwifs[hwif->index ^ 1];
2986 if (hwif->serialized && mate_hwif->present)
2987 mate_irq = mate_hwif->irq;
2988
2989 /*
2990 * Group up with any other hwifs that share our irq(s)
2991 */
2992 for (index = 0; index < MAX_HWIFS; index++) {
2993 if (index != hwif->index) {
2994 ide_hwif_t *g = &ide_hwifs[index];
2995 if (g->irq == hwif->irq || g->irq == mate_irq) {
2996 if (hwgroup && !g->hwgroup)
2997 g->hwgroup = hwgroup;
2998 else if (!hwgroup)
2999 hwgroup = g->hwgroup;
3000 }
3001 }
3002 }
3003
3004 /*
3005 * If we are still without a hwgroup, then form a new one
3006 */
3007 if (hwgroup == NULL) {
3008 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
3009 hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3010 hwgroup->rq = NULL;
3011 hwgroup->handler = NULL;
3012 if (hwif->drives[0].present)
3013 hwgroup->drive = &hwif->drives[0];
3014 else
3015 hwgroup->drive = &hwif->drives[1];
3016 hwgroup->poll_timeout = 0;
3017 init_timer(&hwgroup->timer);
3018 hwgroup->timer.function = &timer_expiry;
3019 hwgroup->timer.data = (unsigned long) hwgroup;
3020 }
3021
3022 /*
3023 * Allocate the irq, if not already obtained for another hwif
3024 */
3025 if (!hwif->got_irq) {
3026 if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, hwgroup)) {
3027 restore_flags(flags);
3028 return 1;
3029 }
3030 for (index = 0; index < MAX_HWIFS; index++) {
3031 ide_hwif_t *g = &ide_hwifs[index];
3032 if (g->irq == hwif->irq)
3033 g->got_irq = 1;
3034 }
3035 }
3036
3037 /*
3038 * Everything is okay, so link us into the hwgroup
3039 */
3040 hwif->hwgroup = hwgroup;
3041 hwif->next = hwgroup->hwif->next;
3042 hwgroup->hwif->next = hwif;
3043
3044 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3045
3046 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3047 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3048 if (hwgroup->hwif != hwif)
3049 printk(" (serialized with %s)", hwgroup->hwif->name);
3050 printk("\n");
3051 return 0;
3052 }
3053
3054 static struct file_operations ide_fops = {
3055 NULL, /* lseek - default */
3056 block_read, /* read - general block-dev read */
3057 block_write, /* write - general block-dev write */
3058 NULL, /* readdir - bad */
3059 NULL, /* select */
3060 ide_ioctl, /* ioctl */
3061 NULL, /* mmap */
3062 ide_open, /* open */
3063 ide_release, /* release */
3064 block_fsync /* fsync */
3065 ,NULL, /* fasync */
3066 ide_check_media_change, /* check_media_change */
3067 revalidate_disk /* revalidate */
3068 };
3069
3070 #ifdef CONFIG_PCI
3071 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3072
3073 typedef void (ide_pci_init_proc_t)(byte, byte);
3074
3075 /*
3076 * ide_probe_pci() scans PCI for a specific vendor/device function,
3077 * and invokes the supplied init routine for each instance detected.
3078 */
3079 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
3080 {
3081 unsigned long flags;
3082 unsigned index;
3083 byte fn, bus;
3084
3085 save_flags(flags);
3086 cli();
3087 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3088 init (bus, fn + func_adj);
3089 }
3090 restore_flags(flags);
3091 }
3092
3093 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3094 #endif /* CONFIG_PCI */
3095
3096 /*
3097 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3098 *
3099 * This routine should ideally be using pcibios_find_class() to find
3100 * all IDE interfaces, but that function causes some systems to "go weird".
3101 */
3102 static void probe_for_hwifs (void)
/* */
3103 {
3104 #ifdef CONFIG_PCI
3105 /*
3106 * Find/initialize PCI IDE interfaces
3107 */
3108 if (pcibios_present()) {
3109 #ifdef CONFIG_BLK_DEV_RZ1000
3110 ide_pci_init_proc_t init_rz1000;
3111 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3112 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3113 #endif /* CONFIG_BLK_DEV_RZ1000 */
3114 #ifdef CONFIG_BLK_DEV_TRITON
3115 /*
3116 * Apparently the BIOS32 services on Intel motherboards are
3117 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3118 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3119 * and then add 1.
3120 */
3121 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3122 #endif /* CONFIG_BLK_DEV_TRITON */
3123 }
3124 #endif /* CONFIG_PCI */
3125 #ifdef CONFIG_BLK_DEV_CMD640
3126 {
3127 extern void ide_probe_for_cmd640x (void);
3128 ide_probe_for_cmd640x();
3129 }
3130 #endif
3131 #ifdef CONFIG_BLK_DEV_PROMISE
3132 init_dc4030();
3133 #endif
3134 }
3135
3136 static int hwif_init (int h)
/* */
3137 {
3138 ide_hwif_t *hwif = &ide_hwifs[h];
3139 void (*rfn)(void);
3140
3141 if (hwif->noprobe)
3142 return 0;
3143 else {
3144 if (hwif->io_base == HD_DATA)
3145 probe_cmos_for_drives (hwif);
3146 probe_hwif (hwif);
3147 if (!hwif->present)
3148 return 0;
3149 }
3150 if (!hwif->irq) {
3151 if (!(hwif->irq = default_irqs[h])) {
3152 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3153 return (hwif->present = 0);
3154 }
3155 }
3156 #ifdef CONFIG_BLK_DEV_HD
3157 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3158 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3159 return (hwif->present = 0);
3160 }
3161 #endif /* CONFIG_BLK_DEV_HD */
3162
3163 hwif->present = 0; /* we set it back to 1 if all is ok below */
3164 switch (hwif->major) {
3165 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3166 #if MAX_HWIFS > 1
3167 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3168 #endif
3169 #if MAX_HWIFS > 2
3170 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3171 #endif
3172 #if MAX_HWIFS > 3
3173 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3174 #endif
3175 default:
3176 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3177 return (hwif->present = 0);
3178 }
3179 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3180 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3181 } else if (init_irq (hwif)) {
3182 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3183 (void) unregister_blkdev (hwif->major, hwif->name);
3184 } else {
3185 init_gendisk(hwif);
3186 blk_dev[hwif->major].request_fn = rfn;
3187 read_ahead[hwif->major] = 8; /* (4kB) */
3188 hwif->present = 1; /* success */
3189 }
3190 return hwif->present;
3191 }
3192
3193 /*
3194 * This is gets invoked once during initialization, to set *everything* up
3195 */
3196 int ide_init (void)
/* */
3197 {
3198 int index;
3199
3200 init_ide_data ();
3201 /*
3202 * Probe for special "known" interface chipsets
3203 */
3204 probe_for_hwifs ();
3205
3206 /*
3207 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3208 */
3209 for (index = 0; index < MAX_HWIFS; ++index)
3210 hwif_init (index);
3211
3212 #ifdef CONFIG_BLK_DEV_IDETAPE
3213 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3214 #endif /* CONFIG_BLK_DEV_IDETAPE */
3215
3216 return 0;
3217 }
3218
3219 #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3220 int ide_register(int io_base, int ctl_port, int irq)
/* */
3221 {
3222 int index, i, rc = -1;
3223 ide_hwif_t *hwif;
3224 unsigned long flags;
3225
3226 save_flags(flags);
3227 cli();
3228 for (index = 0; index < MAX_HWIFS; ++index) {
3229 hwif = &ide_hwifs[index];
3230 if (hwif->present) {
3231 if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3232 break;
3233 } else {
3234 hwif->io_base = io_base;
3235 hwif->ctl_port = ctl_port;
3236 hwif->irq = irq;
3237 hwif->noprobe = 0;
3238 if (!hwif_init(index))
3239 break;
3240 hwif->gd->real_devices = hwif->drives[0].name;
3241 for (i = 0; i < hwif->gd->nr_real; i++)
3242 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3243 rc = index;
3244 }
3245 }
3246 restore_flags(flags);
3247 return rc;
3248 }
3249
3250 void ide_unregister (unsigned int index)
/* ![[last]](../icons/n_last.png)
*/
3251 {
3252 struct gendisk *prev_gd, *gd;
3253 ide_hwif_t *hwif, *g;
3254 ide_hwgroup_t *hwgroup;
3255 int irq_count = 0;
3256 unsigned long flags;
3257
3258 if (index >= MAX_HWIFS)
3259 return;
3260 save_flags(flags);
3261 cli();
3262 hwif = &ide_hwifs[index];
3263 if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3264 restore_flags(flags);
3265 return;
3266 }
3267 hwif->present = 0;
3268 hwgroup = hwif->hwgroup;
3269
3270 /*
3271 * free the irq if we were the only hwif using it
3272 */
3273 g = hwgroup->hwif;
3274 do {
3275 if (g->irq == hwif->irq)
3276 ++irq_count;
3277 g = g->next;
3278 } while (g != hwgroup->hwif);
3279 if (irq_count == 1)
3280 free_irq(hwif->irq, hwgroup);
3281
3282 /*
3283 * Remove us from the hwgroup, and free
3284 * the hwgroup if we were the only member
3285 */
3286 while (hwgroup->hwif->next != hwif)
3287 hwgroup->hwif = hwgroup->hwif->next;
3288 hwgroup->hwif->next = hwif->next;
3289 if (hwgroup->hwif == hwif)
3290 hwgroup->hwif = hwif->next;
3291 if (hwgroup->next_hwif == hwif)
3292 hwgroup->next_hwif = hwif->next;
3293 if (hwgroup->hwif == hwif)
3294 kfree(hwgroup);
3295
3296 /*
3297 * Remove us from the kernel's knowledge
3298 */
3299 unregister_blkdev(hwif->major, hwif->name);
3300 kfree(blksize_size[hwif->major]);
3301 blk_dev[hwif->major].request_fn = NULL;
3302 blksize_size[hwif->major] = NULL;
3303 gd = gendisk_head; prev_gd = NULL;
3304 while (gd && (gd != hwif->gd)) {
3305 prev_gd = gd;
3306 gd = gd->next;
3307 }
3308 if (gd != hwif->gd)
3309 printk("gd not in disk chain!\n");
3310 else {
3311 if (prev_gd != NULL)
3312 prev_gd->next = gd->next;
3313 else
3314 gendisk_head = gd->next;
3315 kfree(gd->sizes);
3316 kfree(gd->part);
3317 kfree(gd);
3318 }
3319 init_hwif_data (index); /* restore hwif data to pristine status */
3320 restore_flags(flags);
3321 }
3322 #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/