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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 rq = blk_dev[hwif->major].current_request;
1473 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1474 goto got_rq;
1475 } while ((hwif = hwif->next) != hwgroup->next_hwif);
1476 return; /* no work left for this hwgroup */
1477 }
1478 got_rq:
1479 do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1480 cli();
1481 } while (hwgroup->handler == NULL);
1482 }
1483
1484 /*
1485 * do_hwgroup_request() invokes ide_do_request() after first masking
1486 * all possible interrupts for the current hwgroup. This prevents race
1487 * conditions in the event that an unexpected interrupt occurs while
1488 * we are in the driver.
1489 *
1490 * Note that when an interrupt is used to reenter the driver, the first level
1491 * handler will already have masked the irq that triggered, but any other ones
1492 * for the hwgroup will still be unmasked. The driver tries to be careful
1493 * about such things.
1494 */
1495 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1496 {
1497 if (hwgroup->handler == NULL) {
1498 ide_hwif_t *hgif = hwgroup->hwif;
1499 ide_hwif_t *hwif = hgif;
1500 do {
1501 disable_irq(hwif->irq);
1502 } while ((hwif = hwif->next) != hgif);
1503 ide_do_request (hwgroup);
1504 do {
1505 enable_irq(hwif->irq);
1506 } while ((hwif = hwif->next) != hgif);
1507 }
1508 }
1509
1510 static void do_ide0_request (void) /* invoked with cli() */
/* */
1511 {
1512 do_hwgroup_request (ide_hwifs[0].hwgroup);
1513 }
1514
1515 #if MAX_HWIFS > 1
1516 static void do_ide1_request (void) /* invoked with cli() */
/* */
1517 {
1518 do_hwgroup_request (ide_hwifs[1].hwgroup);
1519 }
1520 #endif
1521
1522 #if MAX_HWIFS > 2
1523 static void do_ide2_request (void) /* invoked with cli() */
/* */
1524 {
1525 do_hwgroup_request (ide_hwifs[2].hwgroup);
1526 }
1527 #endif
1528
1529 #if MAX_HWIFS > 3
1530 static void do_ide3_request (void) /* invoked with cli() */
/* */
1531 {
1532 do_hwgroup_request (ide_hwifs[3].hwgroup);
1533 }
1534 #endif
1535
1536 static void timer_expiry (unsigned long data)
/* */
1537 {
1538 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1539 ide_drive_t *drive = hwgroup->drive;
1540 unsigned long flags;
1541
1542 save_flags(flags);
1543 cli();
1544
1545 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1546 ide_handler_t *handler = hwgroup->handler;
1547 hwgroup->handler = NULL;
1548 handler(drive);
1549 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1550 sti(); /* drive must have responded just as the timer expired */
1551 printk("%s: marginal timeout\n", drive->name);
1552 } else {
1553 hwgroup->handler = NULL; /* abort the operation */
1554 if (hwgroup->hwif->dmaproc)
1555 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1556 ide_error(drive, "irq timeout", GET_STAT());
1557 }
1558 if (hwgroup->handler == NULL)
1559 do_hwgroup_request (hwgroup);
1560 restore_flags(flags);
1561 }
1562
1563 /*
1564 * There's nothing really useful we can do with an unexpected interrupt,
1565 * other than reading the status register (to clear it), and logging it.
1566 * There should be no way that an irq can happen before we're ready for it,
1567 * so we needn't worry much about losing an "important" interrupt here.
1568 *
1569 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1570 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1571 * "good", we just ignore the interrupt completely.
1572 *
1573 * This routine assumes cli() is in effect when called.
1574 *
1575 * If an unexpected interrupt happens on irq15 while we are handling irq14
1576 * and if the two interfaces are "serialized" (CMD640B), then it looks like
1577 * we could screw up by interfering with a new request being set up for irq15.
1578 *
1579 * In reality, this is a non-issue. The new command is not sent unless the
1580 * drive is ready to accept one, in which case we know the drive is not
1581 * trying to interrupt us. And ide_set_handler() is always invoked before
1582 * completing the issuance of any new drive command, so we will not be
1583 * accidently invoked as a result of any valid command completion interrupt.
1584 *
1585 */
1586 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1587 {
1588 byte stat;
1589 unsigned int unit;
1590 ide_hwif_t *hwif = hwgroup->hwif;
1591
1592 /*
1593 * handle the unexpected interrupt
1594 */
1595 do {
1596 if (hwif->irq == irq) {
1597 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1598 ide_drive_t *drive = &hwif->drives[unit];
1599 if (!drive->present)
1600 continue;
1601 SELECT_DRIVE(hwif,drive);
1602 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1603 (void) ide_dump_status(drive, "unexpected_intr", stat);
1604 if ((stat & DRQ_STAT))
1605 try_to_flush_leftover_data(drive);
1606 }
1607 }
1608 } while ((hwif = hwif->next) != hwgroup->hwif);
1609 SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1610 }
1611
1612 /*
1613 * entry point for all interrupts, caller does cli() for us
1614 */
1615 void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1616 {
1617 ide_hwgroup_t *hwgroup = dev_id;
1618 ide_handler_t *handler;
1619
1620 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1621 ide_drive_t *drive = hwgroup->drive;
1622 hwgroup->handler = NULL;
1623 del_timer(&(hwgroup->timer));
1624 if (drive->unmask)
1625 sti();
1626 handler(drive);
1627 cli(); /* this is necessary, as next rq may be different irq */
1628 if (hwgroup->handler == NULL) {
1629 SET_RECOVERY_TIMER(HWIF(drive));
1630 ide_do_request(hwgroup);
1631 }
1632 } else {
1633 unexpected_intr(irq, hwgroup);
1634 }
1635 cli();
1636 }
1637
1638 /*
1639 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1640 * It returns NULL if the given device number does not match any present drives.
1641 */
1642 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1643 {
1644 int major = MAJOR(i_rdev);
1645 unsigned int h;
1646
1647 for (h = 0; h < MAX_HWIFS; ++h) {
1648 ide_hwif_t *hwif = &ide_hwifs[h];
1649 if (hwif->present && major == hwif->major) {
1650 unsigned unit = DEVICE_NR(i_rdev);
1651 if (unit < MAX_DRIVES) {
1652 ide_drive_t *drive = &hwif->drives[unit];
1653 if (drive->present)
1654 return drive;
1655 } else if (major == IDE0_MAJOR && unit < 4) {
1656 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1657 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1658 }
1659 break;
1660 }
1661 }
1662 return NULL;
1663 }
1664
1665 /*
1666 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1667 */
1668 void ide_init_drive_cmd (struct request *rq)
/* */
1669 {
1670 rq->buffer = NULL;
1671 rq->cmd = IDE_DRIVE_CMD;
1672 rq->sector = 0;
1673 rq->nr_sectors = 0;
1674 rq->current_nr_sectors = 0;
1675 rq->sem = NULL;
1676 rq->bh = NULL;
1677 rq->bhtail = NULL;
1678 rq->next = NULL;
1679
1680 #if 0 /* these are done each time through ide_do_drive_cmd() */
1681 rq->errors = 0;
1682 rq->rq_status = RQ_ACTIVE;
1683 rq->rq_dev = ????;
1684 #endif
1685 }
1686
1687 /*
1688 * This function issues a special IDE device request
1689 * onto the request queue.
1690 *
1691 * If action is ide_wait, then then rq is queued at the end of
1692 * the request queue, and the function sleeps until it has been
1693 * processed. This is for use when invoked from an ioctl handler.
1694 *
1695 * If action is ide_preempt, then the rq is queued at the head of
1696 * the request queue, displacing the currently-being-processed
1697 * request and this function returns immediately without waiting
1698 * for the new rq to be completed. This is VERY DANGEROUS, and is
1699 * intended for careful use by the ATAPI tape/cdrom driver code.
1700 *
1701 * If action is ide_next, then the rq is queued immediately after
1702 * the currently-being-processed-request (if any), and the function
1703 * returns without waiting for the new rq to be completed. As above,
1704 * This is VERY DANGEROUS, and is intended for careful use by the
1705 * ATAPI tape/cdrom driver code.
1706 *
1707 * If action is ide_end, then the rq is queued at the end of the
1708 * request queue, and the function returns immediately without waiting
1709 * for the new rq to be completed. This is again intended for careful
1710 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1711 * when operating in the pipelined operation mode).
1712 */
1713 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1714 {
1715 unsigned long flags;
1716 unsigned int major = HWIF(drive)->major;
1717 struct request *cur_rq;
1718 struct blk_dev_struct *bdev = &blk_dev[major];
1719 struct semaphore sem = MUTEX_LOCKED;
1720
1721 if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1722 return -ENOSYS; /* special drive cmds not supported */
1723 rq->errors = 0;
1724 rq->rq_status = RQ_ACTIVE;
1725 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1726 if (action == ide_wait)
1727 rq->sem = &sem;
1728
1729 save_flags(flags);
1730 cli();
1731 if (action == ide_next)
1732 HWGROUP(drive)->next_hwif = HWIF(drive);
1733 cur_rq = bdev->current_request;
1734
1735 if (cur_rq == NULL || action == ide_preempt) {
1736 rq->next = cur_rq;
1737 bdev->current_request = rq;
1738 if (action == ide_preempt) {
1739 HWGROUP(drive)->rq = NULL;
1740 } else
1741 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1742 bdev->request_fn();
1743 cli();
1744 }
1745 } else {
1746 if (action == ide_wait || action == ide_end) {
1747 while (cur_rq->next != NULL) /* find end of list */
1748 cur_rq = cur_rq->next;
1749 }
1750 rq->next = cur_rq->next;
1751 cur_rq->next = rq;
1752 }
1753 if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1754 down(&sem); /* wait for it to be serviced */
1755 restore_flags(flags);
1756 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1757 }
1758
1759 static int ide_open(struct inode * inode, struct file * filp)
/* */
1760 {
1761 ide_drive_t *drive;
1762 unsigned long flags;
1763
1764 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1765 return -ENODEV;
1766 save_flags(flags);
1767 cli();
1768 while (drive->busy)
1769 sleep_on(&drive->wqueue);
1770 drive->usage++;
1771 restore_flags(flags);
1772 #ifdef CONFIG_BLK_DEV_IDECD
1773 if (drive->media == ide_cdrom)
1774 return ide_cdrom_open (inode, filp, drive);
1775 #endif /* CONFIG_BLK_DEV_IDECD */
1776 #ifdef CONFIG_BLK_DEV_IDETAPE
1777 if (drive->media == ide_tape)
1778 return idetape_blkdev_open (inode, filp, drive);
1779 #endif /* CONFIG_BLK_DEV_IDETAPE */
1780 if (drive->removeable) {
1781 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1782 struct request rq;
1783 check_disk_change(inode->i_rdev);
1784 ide_init_drive_cmd (&rq);
1785 rq.buffer = door_lock;
1786 /*
1787 * Ignore the return code from door_lock,
1788 * since the open() has already succeeded,
1789 * and the door_lock is irrelevant at this point.
1790 */
1791 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1792 }
1793 return 0;
1794 }
1795
1796 /*
1797 * Releasing a block device means we sync() it, so that it can safely
1798 * be forgotten about...
1799 */
1800 static void ide_release(struct inode * inode, struct file * file)
/* */
1801 {
1802 ide_drive_t *drive;
1803
1804 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1805 sync_dev(inode->i_rdev);
1806 drive->usage--;
1807 #ifdef CONFIG_BLK_DEV_IDECD
1808 if (drive->media == ide_cdrom) {
1809 ide_cdrom_release (inode, file, drive);
1810 return;
1811 }
1812 #endif /* CONFIG_BLK_DEV_IDECD */
1813 #ifdef CONFIG_BLK_DEV_IDETAPE
1814 if (drive->media == ide_tape) {
1815 idetape_blkdev_release (inode, file, drive);
1816 return;
1817 }
1818 #endif /* CONFIG_BLK_DEV_IDETAPE */
1819 if (drive->removeable) {
1820 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1821 struct request rq;
1822 invalidate_buffers(inode->i_rdev);
1823 ide_init_drive_cmd (&rq);
1824 rq.buffer = door_unlock;
1825 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1826 }
1827 }
1828 }
1829
1830 /*
1831 * This routine is called to flush all partitions and partition tables
1832 * for a changed disk, and then re-read the new partition table.
1833 * If we are revalidating a disk because of a media change, then we
1834 * enter with usage == 0. If we are using an ioctl, we automatically have
1835 * usage == 1 (we need an open channel to use an ioctl :-), so this
1836 * is our limit.
1837 */
1838 static int revalidate_disk(kdev_t i_rdev)
/* */
1839 {
1840 ide_drive_t *drive;
1841 unsigned int p, major, minor;
1842 long flags;
1843
1844 if ((drive = get_info_ptr(i_rdev)) == NULL)
1845 return -ENODEV;
1846
1847 major = MAJOR(i_rdev);
1848 minor = drive->select.b.unit << PARTN_BITS;
1849 save_flags(flags);
1850 cli();
1851 if (drive->busy || (drive->usage > 1)) {
1852 restore_flags(flags);
1853 return -EBUSY;
1854 };
1855 drive->busy = 1;
1856 restore_flags(flags);
1857
1858 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1859 if (drive->part[p].nr_sects > 0) {
1860 kdev_t devp = MKDEV(major, minor+p);
1861 sync_dev (devp);
1862 invalidate_inodes (devp);
1863 invalidate_buffers (devp);
1864 }
1865 drive->part[p].start_sect = 0;
1866 drive->part[p].nr_sects = 0;
1867 };
1868
1869 drive->part[0].nr_sects = current_capacity(drive);
1870 if (drive->media == ide_disk)
1871 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1872
1873 drive->busy = 0;
1874 wake_up(&drive->wqueue);
1875 return 0;
1876 }
1877
1878 static int write_fs_long (unsigned long useraddr, long value)
/* */
1879 {
1880 int err;
1881
1882 if (NULL == (long *)useraddr)
1883 return -EINVAL;
1884 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1885 return err;
1886 put_user((unsigned)value, (long *) useraddr);
1887 return 0;
1888 }
1889
1890 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1891 unsigned int cmd, unsigned long arg)
1892 {
1893 int err;
1894 ide_drive_t *drive;
1895 unsigned long flags;
1896 struct request rq;
1897
1898 if (!inode || !(inode->i_rdev))
1899 return -EINVAL;
1900 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1901 return -ENODEV;
1902 ide_init_drive_cmd (&rq);
1903 switch (cmd) {
1904 case HDIO_GETGEO:
1905 {
1906 struct hd_geometry *loc = (struct hd_geometry *) arg;
1907 if (!loc || drive->media != ide_disk) return -EINVAL;
1908 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1909 if (err) return err;
1910 put_user(drive->bios_head, (byte *) &loc->heads);
1911 put_user(drive->bios_sect, (byte *) &loc->sectors);
1912 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1913 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1914 (unsigned long *) &loc->start);
1915 return 0;
1916 }
1917 case BLKFLSBUF:
1918 if (!suser()) return -EACCES;
1919 fsync_dev(inode->i_rdev);
1920 invalidate_buffers(inode->i_rdev);
1921 return 0;
1922
1923 case BLKRASET:
1924 if (!suser()) return -EACCES;
1925 if(arg > 0xff) return -EINVAL;
1926 read_ahead[MAJOR(inode->i_rdev)] = arg;
1927 return 0;
1928
1929 case BLKRAGET:
1930 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1931
1932 case BLKGETSIZE: /* Return device size */
1933 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1934 case BLKRRPART: /* Re-read partition tables */
1935 if (!suser()) return -EACCES;
1936 return revalidate_disk(inode->i_rdev);
1937
1938 case HDIO_GET_KEEPSETTINGS:
1939 return write_fs_long(arg, drive->keep_settings);
1940
1941 case HDIO_GET_UNMASKINTR:
1942 return write_fs_long(arg, drive->unmask);
1943
1944 case HDIO_GET_DMA:
1945 return write_fs_long(arg, drive->using_dma);
1946
1947 case HDIO_GET_32BIT:
1948 return write_fs_long(arg, drive->io_32bit);
1949
1950 case HDIO_GET_MULTCOUNT:
1951 return write_fs_long(arg, drive->mult_count);
1952
1953 case HDIO_GET_IDENTITY:
1954 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1955 return -EINVAL;
1956 if (drive->id == NULL)
1957 return -ENOMSG;
1958 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1959 if (!err)
1960 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1961 return err;
1962
1963 case HDIO_GET_NOWERR:
1964 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1965
1966 case HDIO_SET_DMA:
1967 if (!suser()) return -EACCES;
1968 #ifdef CONFIG_BLK_DEV_IDECD
1969 if (drive->media == ide_cdrom)
1970 return -EPERM;
1971 #endif /* CONFIG_BLK_DEV_IDECD */
1972 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1973 return -EPERM;
1974 case HDIO_SET_KEEPSETTINGS:
1975 case HDIO_SET_UNMASKINTR:
1976 case HDIO_SET_NOWERR:
1977 if (arg > 1)
1978 return -EINVAL;
1979 case HDIO_SET_32BIT:
1980 if (!suser()) return -EACCES;
1981 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1982 return -EINVAL;
1983 save_flags(flags);
1984 cli();
1985 switch (cmd) {
1986 case HDIO_SET_DMA:
1987 if (!(HWIF(drive)->dmaproc)) {
1988 restore_flags(flags);
1989 return -EPERM;
1990 }
1991 drive->using_dma = arg;
1992 break;
1993 case HDIO_SET_KEEPSETTINGS:
1994 drive->keep_settings = arg;
1995 break;
1996 case HDIO_SET_UNMASKINTR:
1997 if (arg && HWIF(drive)->no_unmask) {
1998 restore_flags(flags);
1999 return -EPERM;
2000 }
2001 drive->unmask = arg;
2002 break;
2003 case HDIO_SET_NOWERR:
2004 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2005 break;
2006 case HDIO_SET_32BIT:
2007 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
2008 return -EINVAL;
2009 drive->io_32bit = arg;
2010 #ifdef CONFIG_BLK_DEV_DTC2278
2011 if (HWIF(drive)->chipset == ide_dtc2278)
2012 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2013 #endif /* CONFIG_BLK_DEV_DTC2278 */
2014 break;
2015 }
2016 restore_flags(flags);
2017 return 0;
2018
2019 case HDIO_SET_MULTCOUNT:
2020 if (!suser()) return -EACCES;
2021 if (MINOR(inode->i_rdev) & PARTN_MASK)
2022 return -EINVAL;
2023 if (drive->id && arg > drive->id->max_multsect)
2024 return -EINVAL;
2025 save_flags(flags);
2026 cli();
2027 if (drive->special.b.set_multmode) {
2028 restore_flags(flags);
2029 return -EBUSY;
2030 }
2031 drive->mult_req = arg;
2032 drive->special.b.set_multmode = 1;
2033 restore_flags(flags);
2034 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2035 return (drive->mult_count == arg) ? 0 : -EIO;
2036
2037 case HDIO_DRIVE_CMD:
2038 {
2039 byte args[4], *argbuf = args;
2040 int argsize = 4;
2041 if (!suser()) return -EACCES;
2042 if (NULL == (void *) arg) {
2043 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2044 } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2045 memcpy_fromfs(args, (void *)arg, 4);
2046 if (args[3]) {
2047 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2048 argbuf = kmalloc(argsize, GFP_KERNEL);
2049 if (argbuf == NULL)
2050 return -ENOMEM;
2051 argbuf[0] = args[0];
2052 argbuf[1] = args[1];
2053 argbuf[2] = args[2];
2054 argbuf[3] = args[3];
2055 }
2056 if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2057 rq.buffer = argbuf;
2058 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2059 memcpy_tofs((void *)arg, argbuf, argsize);
2060 }
2061 if (argsize > 4)
2062 kfree(argbuf);
2063 }
2064 return err;
2065 }
2066 case HDIO_SET_PIO_MODE:
2067 if (!suser()) return -EACCES;
2068 if (MINOR(inode->i_rdev) & PARTN_MASK)
2069 return -EINVAL;
2070 if (!HWIF(drive)->tuneproc)
2071 return -ENOSYS;
2072 save_flags(flags);
2073 cli();
2074 drive->pio_req = (int) arg;
2075 drive->special.b.set_pio = 1;
2076 restore_flags(flags);
2077 return 0;
2078
2079 RO_IOCTLS(inode->i_rdev, arg);
2080
2081 default:
2082 #ifdef CONFIG_BLK_DEV_IDECD
2083 if (drive->media == ide_cdrom)
2084 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2085 #endif /* CONFIG_BLK_DEV_IDECD */
2086 #ifdef CONFIG_BLK_DEV_IDETAPE
2087 if (drive->media == ide_tape)
2088 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2089 #endif /* CONFIG_BLK_DEV_IDETAPE */
2090 return -EPERM;
2091 }
2092 }
2093
2094 static int ide_check_media_change (kdev_t i_rdev)
/* */
2095 {
2096 ide_drive_t *drive;
2097
2098 if ((drive = get_info_ptr(i_rdev)) == NULL)
2099 return -ENODEV;
2100 #ifdef CONFIG_BLK_DEV_IDECD
2101 if (drive->media == ide_cdrom)
2102 return ide_cdrom_check_media_change (drive);
2103 #endif /* CONFIG_BLK_DEV_IDECD */
2104 if (drive->removeable) /* for disks */
2105 return 1; /* always assume it was changed */
2106 return 0;
2107 }
2108
2109 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2110 {
2111 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2112
2113 if (byteswap) {
2114 /* convert from big-endian to host byte order */
2115 for (p = end ; p != s;) {
2116 unsigned short *pp = (unsigned short *) (p -= 2);
2117 *pp = ntohs(*pp);
2118 }
2119 }
2120
2121 /* strip leading blanks */
2122 while (s != end && *s == ' ')
2123 ++s;
2124
2125 /* compress internal blanks and strip trailing blanks */
2126 while (s != end && *s) {
2127 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2128 *p++ = *(s-1);
2129 }
2130
2131 /* wipe out trailing garbage */
2132 while (p != end)
2133 *p++ = '\0';
2134 }
2135
2136 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2137 {
2138 int bswap;
2139 struct hd_driveid *id;
2140 unsigned long capacity, check;
2141
2142 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2143 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2144 sti();
2145
2146 /*
2147 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2148 */
2149 if ((id->model[0] == 'P' && id->model[1] == 'M')
2150 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2151 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2152 drive->present = 0;
2153 return;
2154 }
2155
2156 /*
2157 * WIN_IDENTIFY returns little-endian info,
2158 * WIN_PIDENTIFY *usually* returns little-endian info.
2159 */
2160 bswap = 1;
2161 if (cmd == WIN_PIDENTIFY) {
2162 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2163 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2164 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2165 bswap = 0; /* Vertos drives may still be weird */
2166 }
2167 ide_fixstring (id->model, sizeof(id->model), bswap);
2168 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2169 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2170
2171 #ifdef CONFIG_BLK_DEV_IDEATAPI
2172 /*
2173 * Check for an ATAPI device
2174 */
2175 if (cmd == WIN_PIDENTIFY) {
2176 byte type = (id->config >> 8) & 0x1f;
2177 printk("%s: %s, ATAPI ", drive->name, id->model);
2178 #ifdef CONFIG_BLK_DEV_PROMISE
2179 if (HWIF(drive)->is_promise2) {
2180 printk(" -- not supported on 2nd Promise port\n");
2181 drive->present = 0;
2182 return;
2183 }
2184 #endif /* CONFIG_BLK_DEV_PROMISE */
2185 switch (type) {
2186 case 0: /* Early cdrom models used zero */
2187 case 5:
2188 #ifdef CONFIG_BLK_DEV_IDECD
2189 printk ("CDROM drive\n");
2190 drive->media = ide_cdrom;
2191 drive->present = 1;
2192 drive->removeable = 1;
2193 return;
2194 #else
2195 printk ("CDROM ");
2196 break;
2197 #endif /* CONFIG_BLK_DEV_IDECD */
2198 case 1:
2199 #ifdef CONFIG_BLK_DEV_IDETAPE
2200 printk ("TAPE drive");
2201 if (idetape_identify_device (drive,id)) {
2202 drive->media = ide_tape;
2203 drive->present = 1;
2204 drive->removeable = 1;
2205 if (HWIF(drive)->dmaproc != NULL &&
2206 !HWIF(drive)->dmaproc(ide_dma_check, drive))
2207 printk(", DMA");
2208 printk("\n");
2209 }
2210 else {
2211 drive->present = 0;
2212 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2213 }
2214 return;
2215 #else
2216 printk ("TAPE ");
2217 break;
2218 #endif /* CONFIG_BLK_DEV_IDETAPE */
2219 default:
2220 drive->present = 0;
2221 printk("Type %d - Unknown device\n", type);
2222 return;
2223 }
2224 drive->present = 0;
2225 printk("- not supported by this kernel\n");
2226 return;
2227 }
2228 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2229
2230 /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2231 if (id->config & (1<<7)) { /* removeable disk ? */
2232 if (id->model[0] != 'W' || id->model[1] != 'D')
2233 drive->removeable = 1;
2234 }
2235
2236 /* SunDisk drives: treat as non-removeable, force one unit */
2237 if (id->model[0] == 'S' && id->model[1] == 'u') {
2238 drive->removeable = 0;
2239 if (drive->select.all & (1<<4)) {
2240 drive->present = 0;
2241 return;
2242 }
2243 }
2244
2245 drive->media = ide_disk;
2246 /* Extract geometry if we did not already have one for the drive */
2247 if (!drive->present) {
2248 drive->present = 1;
2249 drive->cyl = drive->bios_cyl = id->cyls;
2250 drive->head = drive->bios_head = id->heads;
2251 drive->sect = drive->bios_sect = id->sectors;
2252 }
2253 /* Handle logical geometry translation by the drive */
2254 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2255 && (id->cur_heads <= 16) && id->cur_sectors)
2256 {
2257 /*
2258 * Extract the physical drive geometry for our use.
2259 * Note that we purposely do *not* update the bios info.
2260 * This way, programs that use it (like fdisk) will
2261 * still have the same logical view as the BIOS does,
2262 * which keeps the partition table from being screwed.
2263 *
2264 * An exception to this is the cylinder count,
2265 * which we reexamine later on to correct for 1024 limitations.
2266 */
2267 drive->cyl = id->cur_cyls;
2268 drive->head = id->cur_heads;
2269 drive->sect = id->cur_sectors;
2270
2271 /* check for word-swapped "capacity" field in id information */
2272 capacity = drive->cyl * drive->head * drive->sect;
2273 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2274 if (check == capacity) { /* was it swapped? */
2275 /* yes, bring it into little-endian order: */
2276 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2277 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2278 }
2279 }
2280 /* Use physical geometry if what we have still makes no sense */
2281 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2282 drive->cyl = id->cyls;
2283 drive->head = id->heads;
2284 drive->sect = id->sectors;
2285 }
2286 /* Correct the number of cyls if the bios value is too small */
2287 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2288 if (drive->cyl > drive->bios_cyl)
2289 drive->bios_cyl = drive->cyl;
2290 }
2291
2292 (void) current_capacity (drive); /* initialize LBA selection */
2293
2294 printk ("%s: %.40s, %ldMB w/%dkB Cache, %sCHS=%d/%d/%d",
2295 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2296 drive->select.b.lba ? "LBA, " : "",
2297 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2298
2299 drive->mult_count = 0;
2300 if (id->max_multsect) {
2301 drive->mult_req = INITIAL_MULT_COUNT;
2302 if (drive->mult_req > id->max_multsect)
2303 drive->mult_req = id->max_multsect;
2304 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2305 drive->special.b.set_multmode = 1;
2306 }
2307 if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2308 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2309 printk(", DMA");
2310 }
2311 printk("\n");
2312 }
2313
2314 /*
2315 * Delay for *at least* 10ms. As we don't know how much time is left
2316 * until the next tick occurs, we wait an extra tick to be safe.
2317 * This is used only during the probing/polling for drives at boot time.
2318 */
2319 static void delay_10ms (void)
/* */
2320 {
2321 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2322 while (timer > jiffies);
2323 }
2324
2325 /*
2326 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2327 * and waits for a response. It also monitors irqs while this is
2328 * happening, in hope of automatically determining which one is
2329 * being used by the interface.
2330 *
2331 * Returns: 0 device was identified
2332 * 1 device timed-out (no response to identify request)
2333 * 2 device aborted the command (refused to identify itself)
2334 */
2335 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2336 {
2337 int hd_status, rc;
2338 unsigned long timeout;
2339 int irqs = 0;
2340
2341 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2342 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2343 irqs = probe_irq_on(); /* start monitoring irqs */
2344 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2345 }
2346
2347 delay_10ms(); /* take a deep breath */
2348 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2349 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2350 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2351 } else
2352 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2353
2354 #if CONFIG_BLK_DEV_PROMISE
2355 if (IS_PROMISE_DRIVE) {
2356 if(promise_cmd(drive,PROMISE_IDENTIFY))
2357 return 1;
2358 } else
2359 #endif /* CONFIG_BLK_DEV_PROMISE */
2360 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2361 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2362 timeout += jiffies;
2363 do {
2364 if (jiffies > timeout) {
2365 if (!HWIF(drive)->irq)
2366 (void) probe_irq_off(irqs);
2367 return 1; /* drive timed-out */
2368 }
2369 delay_10ms(); /* give drive a breather */
2370 } while (IN_BYTE(hd_status) & BUSY_STAT);
2371
2372 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2373 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2374 cli(); /* some systems need this */
2375 do_identify(drive, cmd); /* drive returned ID */
2376 if (drive->present && drive->media != ide_tape) {
2377 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2378 if (tuneproc != NULL && drive->autotune == 1)
2379 tuneproc(drive, 255); /* auto-tune PIO mode */
2380 }
2381 rc = 0; /* drive responded with ID */
2382 } else
2383 rc = 2; /* drive refused ID */
2384 if (!HWIF(drive)->irq) {
2385 irqs = probe_irq_off(irqs); /* get irq number */
2386 if (irqs > 0)
2387 HWIF(drive)->irq = irqs;
2388 else /* Mmmm.. multiple IRQs */
2389 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2390 }
2391 return rc;
2392 }
2393
2394 /*
2395 * do_probe() has the difficult job of finding a drive if it exists,
2396 * without getting hung up if it doesn't exist, without trampling on
2397 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2398 *
2399 * If a drive is "known" to exist (from CMOS or kernel parameters),
2400 * but does not respond right away, the probe will "hang in there"
2401 * for the maximum wait time (about 30 seconds), otherwise it will
2402 * exit much more quickly.
2403 *
2404 * Returns: 0 device was identified
2405 * 1 device timed-out (no response to identify request)
2406 * 2 device aborted the command (refused to identify itself)
2407 * 3 bad status from device (possible for ATAPI drives)
2408 * 4 probe was not attempted because failure was obvious
2409 */
2410 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2411 {
2412 int rc;
2413 ide_hwif_t *hwif;
2414 #ifdef CONFIG_BLK_DEV_IDEATAPI
2415 if (drive->present) { /* avoid waiting for inappropriate probes */
2416 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2417 return 4;
2418 }
2419 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2420 #ifdef DEBUG
2421 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2422 drive->name, drive->present, drive->media,
2423 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2424 #endif
2425 hwif = HWIF(drive);
2426 SELECT_DRIVE(hwif,drive);
2427 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2428 delay_10ms(); /* wait for BUSY_STAT */
2429 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2430 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2431 return 3; /* no i/f present: avoid killing ethernet cards */
2432 }
2433
2434 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2435 || drive->present || cmd == WIN_PIDENTIFY)
2436 {
2437 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2438 rc = try_to_identify(drive,cmd); /* failed: try again */
2439 if (rc == 1)
2440 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2441 (void) GET_STAT(); /* ensure drive irq is clear */
2442 } else {
2443 rc = 3; /* not present or maybe ATAPI */
2444 }
2445 if (drive->select.b.unit != 0) {
2446 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2447 delay_10ms();
2448 (void) GET_STAT(); /* ensure drive irq is clear */
2449 }
2450 return rc;
2451 }
2452
2453 /*
2454 * probe_for_drive() tests for existance of a given drive using do_probe().
2455 *
2456 * Returns: 0 no device was found
2457 * 1 device was found (note: drive->present might still be 0)
2458 */
2459 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2460 {
2461 if (drive->noprobe) /* skip probing? */
2462 return drive->present;
2463 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2464 #ifdef CONFIG_BLK_DEV_IDEATAPI
2465 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2466 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2467 }
2468 if (!drive->present)
2469 return 0; /* drive not found */
2470 if (drive->id == NULL) { /* identification failed? */
2471 if (drive->media == ide_disk) {
2472 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2473 drive->name, drive->cyl, drive->head, drive->sect);
2474 }
2475 #ifdef CONFIG_BLK_DEV_IDECD
2476 else if (drive->media == ide_cdrom) {
2477 printk("%s: ATAPI cdrom (?)\n", drive->name);
2478 }
2479 #endif /* CONFIG_BLK_DEV_IDECD */
2480 else {
2481 drive->present = 0; /* nuke it */
2482 }
2483 }
2484 return 1; /* drive was found */
2485 }
2486
2487 /*
2488 * This routine only knows how to look for drive units 0 and 1
2489 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2490 */
2491 static void probe_hwif (ide_hwif_t *hwif)
/* */
2492 {
2493 unsigned int unit;
2494
2495 #if CONFIG_BLK_DEV_PROMISE
2496 if (!hwif->is_promise2 &&
2497 (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2498 #else
2499 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2500 #endif /* CONFIG_BLK_DEV_PROMISE */
2501 int msgout = 0;
2502 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2503 ide_drive_t *drive = &hwif->drives[unit];
2504 if (drive->present) {
2505 drive->present = 0;
2506 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2507 msgout = 1;
2508 }
2509 }
2510 if (!msgout)
2511 printk("%s: ports already in use, skipping probe\n", hwif->name);
2512 } else {
2513 unsigned long flags;
2514 save_flags(flags);
2515
2516 sti(); /* needed for jiffies and irq probing */
2517 /*
2518 * Second drive should only exist if first drive was found,
2519 * but a lot of cdrom drives are configured as single slaves.
2520 */
2521 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2522 ide_drive_t *drive = &hwif->drives[unit];
2523 (void) probe_for_drive (drive);
2524 if (drive->present && drive->media == ide_disk) {
2525 if (IS_PROMISE_DRIVE)
2526 drive->select.b.lba = 1; /* required by promise driver */
2527 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2528 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2529 drive->name, drive->head);
2530 drive->present = 0;
2531 }
2532 }
2533 if (drive->present && !hwif->present) {
2534 hwif->present = 1;
2535 request_region(hwif->io_base, 8, hwif->name);
2536 request_region(hwif->ctl_port, 1, hwif->name);
2537 }
2538 }
2539 restore_flags(flags);
2540 }
2541 }
2542
2543 /*
2544 * stridx() returns the offset of c within s,
2545 * or -1 if c is '\0' or not found within s.
2546 */
2547 static int stridx (const char *s, char c)
/* */
2548 {
2549 char *i = strchr(s, c);
2550 return (i && c) ? i - s : -1;
2551 }
2552
2553 /*
2554 * match_parm() does parsing for ide_setup():
2555 *
2556 * 1. the first char of s must be '='.
2557 * 2. if the remainder matches one of the supplied keywords,
2558 * the index (1 based) of the keyword is negated and returned.
2559 * 3. if the remainder is a series of no more than max_vals numbers
2560 * separated by commas, the numbers are saved in vals[] and a
2561 * count of how many were saved is returned. Base10 is assumed,
2562 * and base16 is allowed when prefixed with "0x".
2563 * 4. otherwise, zero is returned.
2564 */
2565 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2566 {
2567 static const char *decimal = "0123456789";
2568 static const char *hex = "0123456789abcdef";
2569 int i, n;
2570
2571 if (*s++ == '=') {
2572 /*
2573 * Try matching against the supplied keywords,
2574 * and return -(index+1) if we match one
2575 */
2576 for (i = 0; *keywords != NULL; ++i) {
2577 if (!strcmp(s, *keywords++))
2578 return -(i+1);
2579 }
2580 /*
2581 * Look for a series of no more than "max_vals"
2582 * numeric values separated by commas, in base10,
2583 * or base16 when prefixed with "0x".
2584 * Return a count of how many were found.
2585 */
2586 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2587 vals[n] = i;
2588 while ((i = stridx(decimal, *++s)) >= 0)
2589 vals[n] = (vals[n] * 10) + i;
2590 if (*s == 'x' && !vals[n]) {
2591 while ((i = stridx(hex, *++s)) >= 0)
2592 vals[n] = (vals[n] * 0x10) + i;
2593 }
2594 if (++n == max_vals)
2595 break;
2596 if (*s == ',')
2597 ++s;
2598 }
2599 if (!*s)
2600 return n;
2601 }
2602 return 0; /* zero = nothing matched */
2603 }
2604
2605 /*
2606 * ide_setup() gets called VERY EARLY during initialization,
2607 * to handle kernel "command line" strings beginning with "hdx="
2608 * or "ide". Here is the complete set currently supported:
2609 *
2610 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2611 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2612 *
2613 * "hdx=noprobe" : drive may be present, but do not probe for it
2614 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2615 * "hdx=cdrom" : drive is present, and is a cdrom drive
2616 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2617 * "hdx=autotune" : driver will attempt to tune interface speed
2618 * to the fastest PIO mode supported,
2619 * if possible for this drive only.
2620 * Not fully supported by all chipset types,
2621 * and quite likely to cause trouble with
2622 * older/odd IDE drives.
2623 *
2624 * "idex=noprobe" : do not attempt to access/use this interface
2625 * "idex=base" : probe for an interface at the addr specified,
2626 * where "base" is usually 0x1f0 or 0x170
2627 * and "ctl" is assumed to be "base"+0x206
2628 * "idex=base,ctl" : specify both base and ctl
2629 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2630 * "idex=autotune" : driver will attempt to tune interface speed
2631 * to the fastest PIO mode supported,
2632 * for all drives on this interface.
2633 * Not fully supported by all chipset types,
2634 * and quite likely to cause trouble with
2635 * older/odd IDE drives.
2636 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2637 * This is the default for most chipsets,
2638 * except the cmd640.
2639 * "idex=serialize" : do not overlap operations on idex and ide(x^1)
2640 *
2641 * The following two are valid ONLY on ide0,
2642 * and the defaults for the base,ctl ports must not be altered.
2643 *
2644 * "ide0=dtc2278" : probe/support DTC2278 interface
2645 * "ide0=ht6560b" : probe/support HT6560B interface
2646 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2647 * (not for PCI -- automatically detected)
2648 * "ide0=qd6580" : probe/support qd6580 interface
2649 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2650 * "ide0=umc8672" : probe/support umc8672 chipsets
2651 */
2652 void ide_setup (char *s)
/* */
2653 {
2654 int i, vals[3];
2655 ide_hwif_t *hwif;
2656 ide_drive_t *drive;
2657 unsigned int hw, unit;
2658 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2659 const char max_hwif = '0' + (MAX_HWIFS - 1);
2660
2661 printk("ide_setup: %s", s);
2662 init_ide_data ();
2663
2664 /*
2665 * Look for drive options: "hdx="
2666 */
2667 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2668 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2669 "autotune", "noautotune", NULL};
2670 unit = s[2] - 'a';
2671 hw = unit / MAX_DRIVES;
2672 unit = unit % MAX_DRIVES;
2673 hwif = &ide_hwifs[hw];
2674 drive = &hwif->drives[unit];
2675 switch (match_parm(&s[3], hd_words, vals, 3)) {
2676 case -1: /* "noprobe" */
2677 drive->noprobe = 1;
2678 goto done;
2679 case -2: /* "nowerr" */
2680 drive->bad_wstat = BAD_R_STAT;
2681 hwif->noprobe = 0;
2682 goto done;
2683 case -3: /* "cdrom" */
2684 drive->present = 1;
2685 drive->media = ide_cdrom;
2686 hwif->noprobe = 0;
2687 goto done;
2688 case -4: /* "serialize" */
2689 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
2690 goto do_serialize;
2691 case -5: /* "autotune" */
2692 drive->autotune = 1;
2693 goto done;
2694 case -6: /* "noautotune" */
2695 drive->autotune = 2;
2696 goto done;
2697 case 3: /* cyl,head,sect */
2698 drive->media = ide_disk;
2699 drive->cyl = drive->bios_cyl = vals[0];
2700 drive->head = drive->bios_head = vals[1];
2701 drive->sect = drive->bios_sect = vals[2];
2702 drive->present = 1;
2703 drive->forced_geom = 1;
2704 hwif->noprobe = 0;
2705 goto done;
2706 default:
2707 goto bad_option;
2708 }
2709 }
2710 /*
2711 * Look for interface options: "idex="
2712 */
2713 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2714 /*
2715 * Be VERY CAREFUL changing this: note hardcoded indexes below
2716 */
2717 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2718 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
2719 hw = s[3] - '0';
2720 hwif = &ide_hwifs[hw];
2721 i = match_parm(&s[4], ide_words, vals, 3);
2722
2723 /*
2724 * Cryptic check to ensure chipset not already set for hwif:
2725 */
2726 if (i != -1 && i != -2) {
2727 if (hwif->chipset != ide_unknown)
2728 goto bad_option;
2729 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2730 goto bad_option;
2731 }
2732 /*
2733 * Interface keywords work only for ide0:
2734 */
2735 if (i <= -6 && hw != 0)
2736 goto bad_hwif;
2737
2738 switch (i) {
2739 #ifdef CONFIG_BLK_DEV_PROMISE
2740 case -11: /* "dc4030" */
2741 {
2742 setup_dc4030(hwif);
2743 goto done;
2744 }
2745 #endif /* CONFIG_BLK_DEV_PROMISE */
2746 #ifdef CONFIG_BLK_DEV_ALI14XX
2747 case -10: /* "ali14xx" */
2748 {
2749 extern void init_ali14xx (void);
2750 init_ali14xx();
2751 goto done;
2752 }
2753 #endif /* CONFIG_BLK_DEV_ALI14XX */
2754 #ifdef CONFIG_BLK_DEV_UMC8672
2755 case -9: /* "umc8672" */
2756 {
2757 extern void init_umc8672 (void);
2758 init_umc8672();
2759 goto done;
2760 }
2761 #endif /* CONFIG_BLK_DEV_UMC8672 */
2762 #ifdef CONFIG_BLK_DEV_DTC2278
2763 case -8: /* "dtc2278" */
2764 {
2765 extern void init_dtc2278 (void);
2766 init_dtc2278();
2767 goto done;
2768 }
2769 #endif /* CONFIG_BLK_DEV_DTC2278 */
2770 #ifdef CONFIG_BLK_DEV_CMD640
2771 case -7: /* "cmd640_vlb" */
2772 {
2773 extern int cmd640_vlb; /* flag for cmd640.c */
2774 cmd640_vlb = 1;
2775 goto done;
2776 }
2777 #endif /* CONFIG_BLK_DEV_CMD640 */
2778 #ifdef CONFIG_BLK_DEV_HT6560B
2779 case -6: /* "ht6560b" */
2780 {
2781 extern void init_ht6560b (void);
2782 init_ht6560b();
2783 goto done;
2784 }
2785 #endif /* CONFIG_BLK_DEV_HT6560B */
2786 #if CONFIG_BLK_DEV_QD6580
2787 case -5: /* "qd6580" (no secondary i/f) */
2788 {
2789 extern void init_qd6580 (void);
2790 init_qd6580();
2791 goto done;
2792 }
2793 #endif /* CONFIG_BLK_DEV_QD6580 */
2794 case -4: /* "noautotune" */
2795 hwif->drives[0].autotune = 2;
2796 hwif->drives[1].autotune = 2;
2797 goto done;
2798 case -3: /* "autotune" */
2799 hwif->drives[0].autotune = 1;
2800 hwif->drives[1].autotune = 1;
2801 goto done;
2802 case -2: /* "serialize" */
2803 do_serialize:
2804 ide_hwifs[hw].serialized = 1; /* serialize */
2805 ide_hwifs[hw^1].serialized = 1; /* with mate */
2806 goto done;
2807
2808 case -1: /* "noprobe" */
2809 hwif->noprobe = 1;
2810 goto done;
2811
2812 case 1: /* base */
2813 vals[1] = vals[0] + 0x206; /* default ctl */
2814 case 2: /* base,ctl */
2815 vals[2] = 0; /* default irq = probe for it */
2816 case 3: /* base,ctl,irq */
2817 hwif->io_base = vals[0];
2818 hwif->ctl_port = vals[1];
2819 hwif->irq = vals[2];
2820 hwif->noprobe = 0;
2821 hwif->chipset = ide_generic;
2822 goto done;
2823
2824 case 0: goto bad_option;
2825 default:
2826 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2827 return;
2828 }
2829 }
2830 bad_option:
2831 printk(" -- BAD OPTION\n");
2832 return;
2833 bad_hwif:
2834 printk("-- NOT SUPPORTED ON ide%d", hw);
2835 done:
2836 printk("\n");
2837 }
2838
2839 /*
2840 * This routine is called from the partition-table code in genhd.c
2841 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2842 *
2843 * The second parameter, "xparm", determines exactly how the translation
2844 * will be handled:
2845 * 0 = convert to CHS with fewer than 1024 cyls
2846 * using the same method as Ontrack DiskManager.
2847 * 1 = same as "0", plus offset everything by 63 sectors.
2848 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2849 * >1 = convert to a CHS geometry with "xparm" heads.
2850 *
2851 * Returns 0 if the translation was not possible, if the device was not
2852 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2853 * Returns 1 if the geometry translation was successful.
2854 */
2855 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2856 {
2857 ide_drive_t *drive;
2858 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2859 const byte *heads = head_vals;
2860 unsigned long tracks;
2861
2862 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2863 return 0;
2864
2865 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2866 return 0; /* we already have a translation */
2867
2868 printk("%s ", msg);
2869
2870 if (drive->id) {
2871 drive->cyl = drive->id->cyls;
2872 drive->head = drive->id->heads;
2873 drive->sect = drive->id->sectors;
2874 }
2875 drive->bios_cyl = drive->cyl;
2876 drive->bios_head = drive->head;
2877 drive->bios_sect = drive->sect;
2878 drive->special.b.set_geometry = 1;
2879
2880 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2881 drive->bios_sect = 63;
2882 if (xparm > 1) {
2883 drive->bios_head = xparm;
2884 drive->bios_cyl = tracks / drive->bios_head;
2885 } else {
2886 while (drive->bios_cyl >= 1024) {
2887 drive->bios_head = *heads;
2888 drive->bios_cyl = tracks / drive->bios_head;
2889 if (0 == *++heads)
2890 break;
2891 }
2892 #if FAKE_FDISK_FOR_EZDRIVE
2893 if (xparm == -1) {
2894 drive->remap_0_to_1 = 1;
2895 msg = "0->1";
2896 } else
2897 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2898 if (xparm == 1) {
2899 drive->sect0 = 63;
2900 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2901 msg = "+63";
2902 }
2903 printk("[remap %s] ", msg);
2904 }
2905 drive->part[0].nr_sects = current_capacity(drive);
2906 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2907 return 1;
2908 }
2909
2910 /*
2911 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2912 * controller that is BIOS compatible with ST-506, and thus showing up in our
2913 * BIOS table, but not register compatible, and therefore not present in CMOS.
2914 *
2915 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2916 * drives in the system -- the ones reflected as drive 1 or 2. The first
2917 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2918 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2919 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2920 * means we have an AT controller hard disk for that drive.
2921 *
2922 * Of course, there is no guarantee that either drive is actually on the
2923 * "primary" IDE interface, but we don't bother trying to sort that out here.
2924 * If a drive is not actually on the primary interface, then these parameters
2925 * will be ignored. This results in the user having to supply the logical
2926 * drive geometry as a boot parameter for each drive not on the primary i/f.
2927 *
2928 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2929 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2930 * for us during initialization. I have the necessary docs -- any takers? -ml
2931 */
2932
2933 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2934 {
2935 #ifdef __i386__
2936 extern struct drive_info_struct drive_info;
2937 byte cmos_disks, *BIOS = (byte *) &drive_info;
2938 int unit;
2939
2940 #ifdef CONFIG_BLK_DEV_PROMISE
2941 if (hwif->is_promise2)
2942 return;
2943 #endif /* CONFIG_BLK_DEV_PROMISE */
2944 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2945 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2946 /* Extract drive geometry from CMOS+BIOS if not already setup */
2947 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2948 ide_drive_t *drive = &hwif->drives[unit];
2949 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2950 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2951 drive->head = drive->bios_head = *(BIOS+2);
2952 drive->sect = drive->bios_sect = *(BIOS+14);
2953 drive->ctl = *(BIOS+8);
2954 drive->present = 1;
2955 }
2956 BIOS += 16;
2957 }
2958 #endif
2959 }
2960
2961 /*
2962 * This routine sets up the irq for an ide interface, and creates a new
2963 * hwgroup for the irq/hwif if none was previously assigned.
2964 *
2965 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2966 * interrupts completely disabled. This can be bad for interrupt latency,
2967 * but anything else has led to problems on some machines. We re-enable
2968 * interrupts as much as we can safely do in most places.
2969 */
2970 static int init_irq (ide_hwif_t *hwif)
/* */
2971 {
2972 unsigned long flags;
2973 ide_hwgroup_t *hwgroup = hwif->hwgroup;
2974 ide_hwif_t *mate_hwif;
2975 unsigned int index, mate_irq = hwif->irq;
2976
2977 save_flags(flags);
2978 cli();
2979
2980 /*
2981 * Handle serialization, regardless of init sequence
2982 */
2983 mate_hwif = &ide_hwifs[hwif->index ^ 1];
2984 if (hwif->serialized && mate_hwif->present)
2985 mate_irq = mate_hwif->irq;
2986
2987 /*
2988 * Group up with any other hwifs that share our irq(s)
2989 */
2990 for (index = 0; index < MAX_HWIFS; index++) {
2991 if (index != hwif->index) {
2992 ide_hwif_t *g = &ide_hwifs[index];
2993 if (g->irq == hwif->irq || g->irq == mate_irq) {
2994 if (hwgroup && !g->hwgroup)
2995 g->hwgroup = hwgroup;
2996 else if (!hwgroup)
2997 hwgroup = g->hwgroup;
2998 }
2999 }
3000 }
3001
3002 /*
3003 * If we are still without a hwgroup, then form a new one
3004 */
3005 if (hwgroup == NULL) {
3006 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
3007 hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3008 hwgroup->rq = NULL;
3009 hwgroup->handler = NULL;
3010 if (hwif->drives[0].present)
3011 hwgroup->drive = &hwif->drives[0];
3012 else
3013 hwgroup->drive = &hwif->drives[1];
3014 hwgroup->poll_timeout = 0;
3015 init_timer(&hwgroup->timer);
3016 hwgroup->timer.function = &timer_expiry;
3017 hwgroup->timer.data = (unsigned long) hwgroup;
3018 }
3019
3020 /*
3021 * Allocate the irq, if not already obtained for another hwif
3022 */
3023 if (!hwif->got_irq) {
3024 if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, hwgroup)) {
3025 restore_flags(flags);
3026 return 1;
3027 }
3028 for (index = 0; index < MAX_HWIFS; index++) {
3029 ide_hwif_t *g = &ide_hwifs[index];
3030 if (g->irq == hwif->irq)
3031 g->got_irq = 1;
3032 }
3033 }
3034
3035 /*
3036 * Everything is okay, so link us into the hwgroup
3037 */
3038 hwif->hwgroup = hwgroup;
3039 hwif->next = hwgroup->hwif->next;
3040 hwgroup->hwif->next = hwif;
3041
3042 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3043
3044 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3045 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3046 if (hwgroup->hwif != hwif)
3047 printk(" (serialized with %s)", hwgroup->hwif->name);
3048 printk("\n");
3049 return 0;
3050 }
3051
3052 static struct file_operations ide_fops = {
3053 NULL, /* lseek - default */
3054 block_read, /* read - general block-dev read */
3055 block_write, /* write - general block-dev write */
3056 NULL, /* readdir - bad */
3057 NULL, /* select */
3058 ide_ioctl, /* ioctl */
3059 NULL, /* mmap */
3060 ide_open, /* open */
3061 ide_release, /* release */
3062 block_fsync /* fsync */
3063 ,NULL, /* fasync */
3064 ide_check_media_change, /* check_media_change */
3065 revalidate_disk /* revalidate */
3066 };
3067
3068 #ifdef CONFIG_PCI
3069 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3070
3071 typedef void (ide_pci_init_proc_t)(byte, byte);
3072
3073 /*
3074 * ide_probe_pci() scans PCI for a specific vendor/device function,
3075 * and invokes the supplied init routine for each instance detected.
3076 */
3077 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
3078 {
3079 unsigned long flags;
3080 unsigned index;
3081 byte fn, bus;
3082
3083 save_flags(flags);
3084 cli();
3085 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3086 init (bus, fn + func_adj);
3087 }
3088 restore_flags(flags);
3089 }
3090
3091 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3092 #endif /* CONFIG_PCI */
3093
3094 /*
3095 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3096 *
3097 * This routine should ideally be using pcibios_find_class() to find
3098 * all IDE interfaces, but that function causes some systems to "go weird".
3099 */
3100 static void probe_for_hwifs (void)
/* */
3101 {
3102 #ifdef CONFIG_PCI
3103 /*
3104 * Find/initialize PCI IDE interfaces
3105 */
3106 if (pcibios_present()) {
3107 #ifdef CONFIG_BLK_DEV_RZ1000
3108 ide_pci_init_proc_t init_rz1000;
3109 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3110 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3111 #endif /* CONFIG_BLK_DEV_RZ1000 */
3112 #ifdef CONFIG_BLK_DEV_TRITON
3113 /*
3114 * Apparently the BIOS32 services on Intel motherboards are
3115 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3116 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3117 * and then add 1.
3118 */
3119 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3120 #endif /* CONFIG_BLK_DEV_TRITON */
3121 }
3122 #endif /* CONFIG_PCI */
3123 #ifdef CONFIG_BLK_DEV_CMD640
3124 {
3125 extern void ide_probe_for_cmd640x (void);
3126 ide_probe_for_cmd640x();
3127 }
3128 #endif
3129 #ifdef CONFIG_BLK_DEV_PROMISE
3130 init_dc4030();
3131 #endif
3132 }
3133
3134 static int hwif_init (int h)
/* */
3135 {
3136 ide_hwif_t *hwif = &ide_hwifs[h];
3137 void (*rfn)(void);
3138
3139 if (hwif->noprobe)
3140 return 0;
3141 else {
3142 if (hwif->io_base == HD_DATA)
3143 probe_cmos_for_drives (hwif);
3144 probe_hwif (hwif);
3145 if (!hwif->present)
3146 return 0;
3147 }
3148 if (!hwif->irq) {
3149 if (!(hwif->irq = default_irqs[h])) {
3150 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3151 return (hwif->present = 0);
3152 }
3153 }
3154 #ifdef CONFIG_BLK_DEV_HD
3155 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3156 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3157 return (hwif->present = 0);
3158 }
3159 #endif /* CONFIG_BLK_DEV_HD */
3160
3161 hwif->present = 0; /* we set it back to 1 if all is ok below */
3162 switch (hwif->major) {
3163 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3164 #if MAX_HWIFS > 1
3165 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3166 #endif
3167 #if MAX_HWIFS > 2
3168 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3169 #endif
3170 #if MAX_HWIFS > 3
3171 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3172 #endif
3173 default:
3174 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3175 return (hwif->present = 0);
3176 }
3177 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3178 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3179 } else if (init_irq (hwif)) {
3180 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3181 (void) unregister_blkdev (hwif->major, hwif->name);
3182 } else {
3183 init_gendisk(hwif);
3184 blk_dev[hwif->major].request_fn = rfn;
3185 read_ahead[hwif->major] = 8; /* (4kB) */
3186 hwif->present = 1; /* success */
3187 }
3188 return hwif->present;
3189 }
3190
3191 /*
3192 * This is gets invoked once during initialization, to set *everything* up
3193 */
3194 int ide_init (void)
/* */
3195 {
3196 int index;
3197
3198 init_ide_data ();
3199 /*
3200 * Probe for special "known" interface chipsets
3201 */
3202 probe_for_hwifs ();
3203
3204 /*
3205 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3206 */
3207 for (index = 0; index < MAX_HWIFS; ++index)
3208 hwif_init (index);
3209
3210 #ifdef CONFIG_BLK_DEV_IDETAPE
3211 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3212 #endif /* CONFIG_BLK_DEV_IDETAPE */
3213
3214 return 0;
3215 }
3216
3217 #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3218 int ide_register(int io_base, int ctl_port, int irq)
/* */
3219 {
3220 int index, i, rc = -1;
3221 ide_hwif_t *hwif;
3222 unsigned long flags;
3223
3224 save_flags(flags);
3225 cli();
3226 for (index = 0; index < MAX_HWIFS; ++index) {
3227 hwif = &ide_hwifs[index];
3228 if (hwif->present) {
3229 if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3230 break;
3231 } else {
3232 hwif->io_base = io_base;
3233 hwif->ctl_port = ctl_port;
3234 hwif->irq = irq;
3235 hwif->noprobe = 0;
3236 if (!hwif_init(index))
3237 break;
3238 hwif->gd->real_devices = hwif->drives[0].name;
3239 for (i = 0; i < hwif->gd->nr_real; i++)
3240 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3241 rc = index;
3242 }
3243 }
3244 restore_flags(flags);
3245 return rc;
3246 }
3247
3248 void ide_unregister (unsigned int index)
/* ![[last]](../icons/n_last.png)
*/
3249 {
3250 struct gendisk *prev_gd, *gd;
3251 ide_hwif_t *hwif, *g;
3252 ide_hwgroup_t *hwgroup;
3253 int irq_count = 0;
3254 unsigned long flags;
3255
3256 if (index >= MAX_HWIFS)
3257 return;
3258 save_flags(flags);
3259 cli();
3260 hwif = &ide_hwifs[index];
3261 if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3262 restore_flags(flags);
3263 return;
3264 }
3265 hwif->present = 0;
3266 hwgroup = hwif->hwgroup;
3267
3268 /*
3269 * free the irq if we were the only hwif using it
3270 */
3271 g = hwgroup->hwif;
3272 do {
3273 if (g->irq == hwif->irq)
3274 ++irq_count;
3275 g = g->next;
3276 } while (g != hwgroup->hwif);
3277 if (irq_count == 1)
3278 free_irq(hwif->irq, hwgroup);
3279
3280 /*
3281 * Remove us from the hwgroup, and free
3282 * the hwgroup if we were the only member
3283 */
3284 while (hwgroup->hwif->next != hwif)
3285 hwgroup->hwif = hwgroup->hwif->next;
3286 hwgroup->hwif->next = hwif->next;
3287 if (hwgroup->hwif == hwif)
3288 hwgroup->hwif = hwif->next;
3289 if (hwgroup->next_hwif == hwif)
3290 hwgroup->next_hwif = hwif->next;
3291 if (hwgroup->hwif == hwif)
3292 kfree(hwgroup);
3293
3294 /*
3295 * Remove us from the kernel's knowledge
3296 */
3297 unregister_blkdev(hwif->major, hwif->name);
3298 kfree(blksize_size[hwif->major]);
3299 blk_dev[hwif->major].request_fn = NULL;
3300 blksize_size[hwif->major] = NULL;
3301 gd = gendisk_head; prev_gd = NULL;
3302 while (gd && (gd != hwif->gd)) {
3303 prev_gd = gd;
3304 gd = gd->next;
3305 }
3306 if (gd != hwif->gd)
3307 printk("gd not in disk chain!\n");
3308 else {
3309 if (prev_gd != NULL)
3310 prev_gd->next = gd->next;
3311 else
3312 gendisk_head = gd->next;
3313 kfree(gd->sizes);
3314 kfree(gd->part);
3315 kfree(gd);
3316 }
3317 init_hwif_data (index); /* restore hwif data to pristine status */
3318 restore_flags(flags);
3319 }
3320 #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/