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*/
1 /*
2 * linux/drivers/block/ide.c Version 5.37 Apr 6, 1996
3 *
4 * Copyright (C) 1994-1996 Linus Torvalds & authors (see below)
5 */
6 #define _IDE_C /* needed by <linux/blk.h> */
7
8 /*
9 * This is the multiple IDE interface driver, as evolved from hd.c.
10 * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
11 * There can be up to two drives per interface, as per the ATA-2 spec.
12 *
13 * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
14 * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
15 * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
16 * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
17 *
18 * It is easy to extend ide.c to handle more than four interfaces:
19 *
20 * Change the MAX_HWIFS constant in ide.h.
21 *
22 * Define some new major numbers (in major.h), and insert them into
23 * the ide_hwif_to_major table in ide.c.
24 *
25 * Fill in the extra values for the new interfaces into the two tables
26 * inside ide.c: default_io_base[] and default_irqs[].
27 *
28 * Create the new request handlers by cloning "do_ide3_request()"
29 * for each new interface, and add them to the switch statement
30 * in the ide_init() function in ide.c.
31 *
32 * Recompile, create the new /dev/ entries, and it will probably work.
33 *
34 * From hd.c:
35 * |
36 * | It traverses the request-list, using interrupts to jump between functions.
37 * | As nearly all functions can be called within interrupts, we may not sleep.
38 * | Special care is recommended. Have Fun!
39 * |
40 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
41 * |
42 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
43 * | in the early extended-partition checks and added DM partitions.
44 * |
45 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
46 * |
47 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
48 * | and general streamlining by Mark Lord (mlord@pobox.com).
49 *
50 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
51 *
52 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
53 * Delman Lee (delman@mipg.upenn.edu) ("Mr. atdisk2")
54 * Petri Mattila (ptjmatti@kruuna.helsinki.fi) (EIDE stuff)
55 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
56 *
57 * Maintained by Mark Lord (mlord@pobox.com): ide.c, ide.h, triton.c, hd.c, ..
58 *
59 * This was a rewrite of just about everything from hd.c, though some original
60 * code is still sprinkled about. Think of it as a major evolution, with
61 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
62 *
63 * Version 1.0 ALPHA initial code, primary i/f working okay
64 * Version 1.3 BETA dual i/f on shared irq tested & working!
65 * Version 1.4 BETA added auto probing for irq(s)
66 * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
67 * ...
68 * Version 3.5 correct the bios_cyl field if it's too small
69 * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
70 * Version 3.6 cosmetic corrections to comments and stuff
71 * (linux 1.1.77) reorganise probing code to make it understandable
72 * added halfway retry to probing for drive identification
73 * added "hdx=noprobe" command line option
74 * allow setting multmode even when identification fails
75 * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
76 * increase DRQ_WAIT to eliminate nuisance messages
77 * wait for DRQ_STAT instead of DATA_READY during probing
78 * (courtesy of Gary Thomas gary@efland.UU.NET)
79 * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
80 * update of ide-cd.c from Scott, allows blocksize=1024
81 * cdrom probe fixes, inspired by jprang@uni-duisburg.de
82 * Version 3.9 don't use LBA if lba_capacity looks funny
83 * correct the drive capacity calculations
84 * fix probing for old Seagates without IDE_ALTSTATUS_REG
85 * fix byte-ordering for some NEC cdrom drives
86 * Version 3.10 disable multiple mode by default; was causing trouble
87 * Version 3.11 fix mis-identification of old WD disks as cdroms
88 * Version 3,12 simplify logic for selecting initial mult_count
89 * (fixes problems with buggy WD drives)
90 * Version 3.13 remove excess "multiple mode disabled" messages
91 * Version 3.14 fix ide_error() handling of BUSY_STAT
92 * fix byte-swapped cdrom strings (again.. arghh!)
93 * ignore INDEX bit when checking the ALTSTATUS reg
94 * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
95 * ignore WRERR_STAT for non-write operations
96 * added vlb_sync support for DC-2000A & others,
97 * (incl. some Promise chips), courtesy of Frank Gockel
98 * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
99 * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
100 * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
101 * add boot flag to "serialize" operation for CMD i/f
102 * add optional support for DTC2278 interfaces,
103 * courtesy of andy@cercle.cts.com (Dyan Wile).
104 * add boot flag to enable "dtc2278" probe
105 * add probe to avoid EATA (SCSI) interfaces,
106 * courtesy of neuffer@goofy.zdv.uni-mainz.de.
107 * Version 4.00 tidy up verify_area() calls - heiko@colossus.escape.de
108 * add flag to ignore WRERR_STAT for some drives
109 * courtesy of David.H.West@um.cc.umich.edu
110 * assembly syntax tweak to vlb_sync
111 * removable drive support from scuba@cs.tu-berlin.de
112 * add transparent support for DiskManager-6.0x "Dynamic
113 * Disk Overlay" (DDO), most of this is in genhd.c
114 * eliminate "multiple mode turned off" message at boot
115 * Version 4.10 fix bug in ioctl for "hdparm -c3"
116 * fix DM6:DDO support -- now works with LILO, fdisk, ...
117 * don't treat some naughty WD drives as removable
118 * Version 4.11 updated DM6 support using info provided by OnTrack
119 * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
120 * added support for 3rd/4th/alternative IDE ports
121 * created ide.h; ide-cd.c now compiles separate from ide.c
122 * hopefully fixed infinite "unexpected_intr" from cdroms
123 * zillions of other changes and restructuring
124 * somehow reduced overall memory usage by several kB
125 * probably slowed things down slightly, but worth it
126 * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
127 * was happening at various times/places: whenever the
128 * ide-interface's ctl_port was used to "mask" the irq,
129 * it also would trigger an edge in the process of masking
130 * which would result in a self-inflicted interrupt!!
131 * (such a stupid way to build a hardware interrupt mask).
132 * This is now fixed (after a year of head-scratching).
133 * Version 5.02 got rid of need for {enable,disable}_irq_list()
134 * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
135 * removed PROBE_FOR_IRQS option -- no longer needed
136 * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
137 * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
138 * added more comments, cleaned up unexpected_intr()
139 * OOOPS! fixed null pointer problem in ide reset code
140 * added autodetect for Triton chipset -- no effect yet
141 * Version 5.05 OOOPS! fixed bug in revalidate_disk()
142 * OOOPS! fixed bug in ide_do_request()
143 * added ATAPI reset sequence for cdroms
144 * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
145 * some (mostly) cosmetic changes
146 * Version 5.11 added ht6560b support by malafoss@snakemail.hut.fi
147 * reworked PCI scanning code
148 * added automatic RZ1000 detection/support
149 * added automatic PCI CMD640 detection/support
150 * added option for VLB CMD640 support
151 * tweaked probe to find cdrom on hdb with disks on hda,hdc
152 * Version 5.12 some performance tuning
153 * added message to alert user to bad /dev/hd[cd] entries
154 * OOOPS! fixed bug in atapi reset
155 * driver now forces "serialize" again for all cmd640 chips
156 * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
157 * made do_drive_cmd() into public ide_do_drive_cmd()
158 * Version 5.13 fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
159 * fixed ht6560b support
160 * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
161 * don't bother invalidating nonexistent partitions
162 * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
163 * added & tested full EZ-DRIVE support -- don't use LILO!
164 * don't enable 2nd CMD640 PCI port during init - conflict
165 * Version 5.15 bug fix in init_cmd640_vlb()
166 * bug fix in interrupt sharing code
167 * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
168 * remove "Huh?" from cmd640 code
169 * added qd6580 interface speed select from Colten Edwards
170 * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
171 * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
172 * new UMC8672 code, moved to umc8672.c, #include'd for now
173 * disallow turning on DMA when h/w not capable of DMA
174 * Version 5.19 fix potential infinite timeout on resets
175 * extend reset poll into a general purpose polling scheme
176 * add atapi tape drive support from Gadi Oxman
177 * simplify exit from _intr routines -- no IDE_DO_REQUEST
178 * Version 5.20 leave current rq on blkdev request list during I/O
179 * generalized ide_do_drive_cmd() for tape/cdrom driver use
180 * Version 5.21 fix nasty cdrom/tape bug (ide_preempt was messed up)
181 * Version 5.22 fix ide_xlate_1024() to work with/without drive->id
182 * Version 5.23 miscellaneous touch-ups
183 * Version 5.24 fix #if's for SUPPORT_CMD640
184 * Version 5.25 more touch-ups, fix cdrom resets, ...
185 * cmd640.c now configs/compiles separate from ide.c
186 * Version 5.26 keep_settings now maintains the using_dma flag
187 * fix [EZD] remap message to only output at boot time
188 * fix "bad /dev/ entry" message to say hdc, not hdc0
189 * fix ide_xlate_1024() to respect user specified CHS
190 * use CHS from partn table if it looks translated
191 * re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
192 * keep track of interface chipset type, when known
193 * add generic PIO mode "tuneproc" mechanism
194 * fix cmd640_vlb option
195 * fix ht6560b support (was completely broken)
196 * umc8672.c now configures/compiles separate from ide.c
197 * move dtc2278 support to dtc2278.c
198 * move ht6560b support to ht6560b.c
199 * move qd6580 support to qd6580.c
200 * add ali14xx support in ali14xx.c
201 * Version 5.27 add [no]autotune parameters to help cmd640
202 * move rz1000 support to rz1000.c
203 * Version 5.28 #include "ide_modes.h"
204 * fix disallow_unmask: now per-interface "no_unmask" bit
205 * force io_32bit to be the same on drive pairs of dtc2278
206 * improved IDE tape error handling, and tape DMA support
207 * bugfix in ide_do_drive_cmd() for cdroms + serialize
208 * Version 5.29 fixed non-IDE check for too many physical heads
209 * don't use LBA if capacity is smaller than CHS
210 * Version 5.30 remove real_devices kludge, formerly used by genhd.c
211 * Version 5.32 change "KB" to "kB"
212 * fix serialize (was broken in kernel 1.3.72)
213 * add support for "hdparm -I"
214 * use common code for disk/tape/cdrom IDE_DRIVE_CMDs
215 * add support for Promise DC4030VL caching card
216 * improved serialize support
217 * put partition check back into alphabetical order
218 * add config option for PCMCIA baggage
219 * try to make PCMCIA support safer to use
220 * improve security on ioctls(): all are suser() only
221 * Version 5.33 improve handling of HDIO_DRIVE_CMDs that read data
222 * Version 5.34 fix irq-sharing problem from 5.33
223 * fix cdrom ioctl problem from 5.33
224 * Version 5.35 cosmetic changes
225 * fix cli() problem in try_to_identify()
226 * Version 5.36 fixes to optional PCMCIA support
227 * Version 5.37 don't use DMA when "noautotune" is specified
228 * Version 5.37a (go) fix shared irq probing (was broken in kernel 1.3.72)
229 * call unplug_device() from ide_do_drive_cmd()
230 *
231 * Some additional driver compile-time options are in ide.h
232 *
233 * To do, in likely order of completion:
234 * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
235 */
236
237 #undef REALLY_SLOW_IO /* most systems can safely undef this */
238
239 #include <linux/config.h>
240 #include <linux/types.h>
241 #include <linux/string.h>
242 #include <linux/kernel.h>
243 #include <linux/delay.h>
244 #include <linux/timer.h>
245 #include <linux/mm.h>
246 #include <linux/ioport.h>
247 #include <linux/interrupt.h>
248 #include <linux/major.h>
249 #include <linux/blkdev.h>
250 #include <linux/errno.h>
251 #include <linux/hdreg.h>
252 #include <linux/genhd.h>
253 #include <linux/malloc.h>
254
255 #include <asm/byteorder.h>
256 #include <asm/irq.h>
257 #include <asm/segment.h>
258 #include <asm/io.h>
259
260 #ifdef CONFIG_PCI
261 #include <linux/bios32.h>
262 #include <linux/pci.h>
263 #endif /* CONFIG_PCI */
264
265 #include "ide.h"
266 #include "ide_modes.h"
267
268 #ifdef CONFIG_BLK_DEV_PROMISE
269 #include "promise.h"
270 #define IS_PROMISE_DRIVE (HWIF(drive)->chipset == ide_promise)
271 #else
272 #define IS_PROMISE_DRIVE (0) /* auto-NULLs out Promise code */
273 #endif /* CONFIG_BLK_DEV_PROMISE */
274
275 static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
276
277 static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
278 static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
279
280 #if (DISK_RECOVERY_TIME > 0)
281 /*
282 * For really screwy hardware (hey, at least it *can* be used with Linux)
283 * we can enforce a minimum delay time between successive operations.
284 */
285 static unsigned long read_timer(void)
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*/
286 {
287 unsigned long t, flags;
288 int i;
289
290 save_flags(flags);
291 cli();
292 t = jiffies * 11932;
293 outb_p(0, 0x43);
294 i = inb_p(0x40);
295 i |= inb(0x40) << 8;
296 restore_flags(flags);
297 return (t - i);
298 }
299
300 static void set_recovery_timer (ide_hwif_t *hwif)
/* ![[previous]](../icons/left.png)
*/
301 {
302 hwif->last_time = read_timer();
303 }
304 #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
305
306 #else
307
308 #define SET_RECOVERY_TIMER(drive)
309
310 #endif /* DISK_RECOVERY_TIME */
311
312
313 /*
314 * Do not even *think* about calling this!
315 */
316 static void init_hwif_data (unsigned int index)
/* */
317 {
318 byte *p;
319 unsigned int unit;
320 ide_hwif_t *hwif = &ide_hwifs[index];
321
322 /* bulk initialize hwif & drive info with zeros */
323 p = ((byte *) hwif) + sizeof(ide_hwif_t);
324 do {
325 *--p = 0;
326 } while (p > (byte *) hwif);
327
328 /* fill in any non-zero initial values */
329 hwif->index = index;
330 hwif->noprobe = (index > 1);
331 hwif->io_base = default_io_base[index];
332 hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
333 #ifdef CONFIG_BLK_DEV_HD
334 if (hwif->io_base == HD_DATA)
335 hwif->noprobe = 1; /* may be overridden by ide_setup() */
336 #endif /* CONFIG_BLK_DEV_HD */
337 hwif->major = ide_hwif_to_major[index];
338 hwif->name[0] = 'i';
339 hwif->name[1] = 'd';
340 hwif->name[2] = 'e';
341 hwif->name[3] = '0' + index;
342 #ifdef CONFIG_BLK_DEV_IDETAPE
343 hwif->tape_drive = NULL;
344 #endif /* CONFIG_BLK_DEV_IDETAPE */
345 for (unit = 0; unit < MAX_DRIVES; ++unit) {
346 ide_drive_t *drive = &hwif->drives[unit];
347
348 drive->select.all = (unit<<4)|0xa0;
349 drive->hwif = hwif;
350 drive->ctl = 0x08;
351 drive->ready_stat = READY_STAT;
352 drive->bad_wstat = BAD_W_STAT;
353 drive->special.b.recalibrate = 1;
354 drive->special.b.set_geometry = 1;
355 drive->name[0] = 'h';
356 drive->name[1] = 'd';
357 drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
358 }
359 }
360
361 /*
362 * init_ide_data() sets reasonable default values into all fields
363 * of all instances of the hwifs and drives, but only on the first call.
364 * Subsequent calls have no effect (they don't wipe out anything).
365 *
366 * This routine is normally called at driver initialization time,
367 * but may also be called MUCH earlier during kernel "command-line"
368 * parameter processing. As such, we cannot depend on any other parts
369 * of the kernel (such as memory allocation) to be functioning yet.
370 *
371 * This is too bad, as otherwise we could dynamically allocate the
372 * ide_drive_t structs as needed, rather than always consuming memory
373 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
374 */
375 #define MAGIC_COOKIE 0x12345678
376 static void init_ide_data (void)
/* */
377 {
378 unsigned int index;
379 static unsigned long magic_cookie = MAGIC_COOKIE;
380
381 if (magic_cookie != MAGIC_COOKIE)
382 return; /* already initialized */
383 magic_cookie = 0;
384
385 for (index = 0; index < MAX_HWIFS; ++index)
386 init_hwif_data(index);
387 }
388
389 #if SUPPORT_VLB_SYNC
390 /*
391 * Some localbus EIDE interfaces require a special access sequence
392 * when using 32-bit I/O instructions to transfer data. We call this
393 * the "vlb_sync" sequence, which consists of three successive reads
394 * of the sector count register location, with interrupts disabled
395 * to ensure that the reads all happen together.
396 */
397 static inline void do_vlb_sync (unsigned short port) {
/* */
398 (void) inb (port);
399 (void) inb (port);
400 (void) inb (port);
401 }
402 #endif /* SUPPORT_VLB_SYNC */
403
404 /*
405 * This is used for most PIO data transfers *from* the IDE interface
406 */
407 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
408 {
409 unsigned short io_base = HWIF(drive)->io_base;
410 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
411 byte io_32bit = drive->io_32bit;
412
413 if (io_32bit) {
414 #if SUPPORT_VLB_SYNC
415 if (io_32bit & 2) {
416 cli();
417 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
418 insl(data_reg, buffer, wcount);
419 if (drive->unmask)
420 sti();
421 } else
422 #endif /* SUPPORT_VLB_SYNC */
423 insl(data_reg, buffer, wcount);
424 } else
425 insw(data_reg, buffer, wcount<<1);
426 }
427
428 /*
429 * This is used for most PIO data transfers *to* the IDE interface
430 */
431 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
/* */
432 {
433 unsigned short io_base = HWIF(drive)->io_base;
434 unsigned short data_reg = io_base+IDE_DATA_OFFSET;
435 byte io_32bit = drive->io_32bit;
436
437 if (io_32bit) {
438 #if SUPPORT_VLB_SYNC
439 if (io_32bit & 2) {
440 cli();
441 do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
442 outsl(data_reg, buffer, wcount);
443 if (drive->unmask)
444 sti();
445 } else
446 #endif /* SUPPORT_VLB_SYNC */
447 outsl(data_reg, buffer, wcount);
448 } else
449 outsw(data_reg, buffer, wcount<<1);
450 }
451
452 /*
453 * This should get invoked any time we exit the driver to
454 * wait for an interrupt response from a drive. handler() points
455 * at the appropriate code to handle the next interrupt, and a
456 * timer is started to prevent us from waiting forever in case
457 * something goes wrong (see the timer_expiry() handler later on).
458 */
459 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
/* */
460 {
461 ide_hwgroup_t *hwgroup = HWGROUP(drive);
462 #ifdef DEBUG
463 if (hwgroup->handler != NULL) {
464 printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
465 drive->name, hwgroup->handler, handler);
466 }
467 #endif
468 hwgroup->handler = handler;
469 hwgroup->timer.expires = jiffies + timeout;
470 add_timer(&(hwgroup->timer));
471 }
472
473 /*
474 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
475 * value for this drive (from its reported identification information).
476 *
477 * Returns: 1 if lba_capacity looks sensible
478 * 0 otherwise
479 */
480 static int lba_capacity_is_ok (struct hd_driveid *id)
/* */
481 {
482 unsigned long lba_sects = id->lba_capacity;
483 unsigned long chs_sects = id->cyls * id->heads * id->sectors;
484 unsigned long _10_percent = chs_sects / 10;
485
486 /* perform a rough sanity check on lba_sects: within 10% is "okay" */
487 if ((lba_sects - chs_sects) < _10_percent)
488 return 1; /* lba_capacity is good */
489
490 /* some drives have the word order reversed */
491 lba_sects = (lba_sects << 16) | (lba_sects >> 16);
492 if ((lba_sects - chs_sects) < _10_percent) {
493 id->lba_capacity = lba_sects; /* fix it */
494 return 1; /* lba_capacity is (now) good */
495 }
496 return 0; /* lba_capacity value is bad */
497 }
498
499 /*
500 * current_capacity() returns the capacity (in sectors) of a drive
501 * according to its current geometry/LBA settings.
502 */
503 static unsigned long current_capacity (ide_drive_t *drive)
/* */
504 {
505 struct hd_driveid *id = drive->id;
506 unsigned long capacity = drive->cyl * drive->head * drive->sect;
507
508 if (!drive->present)
509 return 0;
510 if (drive->media != ide_disk)
511 return 0x7fffffff; /* cdrom or tape */
512 drive->select.b.lba = 0;
513 /* Determine capacity, and use LBA if the drive properly supports it */
514 if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
515 if (id->lba_capacity >= capacity) {
516 capacity = id->lba_capacity;
517 drive->select.b.lba = 1;
518 }
519 }
520 return (capacity - drive->sect0);
521 }
522
523 /*
524 * ide_geninit() is called exactly *once* for each major, from genhd.c,
525 * at the beginning of the initial partition check for the drives.
526 */
527 static void ide_geninit (struct gendisk *gd)
/* */
528 {
529 unsigned int unit;
530 ide_hwif_t *hwif = gd->real_devices;
531
532 for (unit = 0; unit < gd->nr_real; ++unit) {
533 ide_drive_t *drive = &hwif->drives[unit];
534 #ifdef CONFIG_BLK_DEV_IDECD
535 if (drive->present && drive->media == ide_cdrom)
536 ide_cdrom_setup(drive);
537 #endif /* CONFIG_BLK_DEV_IDECD */
538 #ifdef CONFIG_BLK_DEV_IDETAPE
539 if (drive->present && drive->media == ide_tape)
540 idetape_setup(drive);
541 #endif /* CONFIG_BLK_DEV_IDETAPE */
542 drive->part[0].nr_sects = current_capacity(drive);
543 if (!drive->present || drive->media != ide_disk) {
544 drive->part[0].start_sect = -1; /* skip partition check */
545 }
546 }
547 }
548
549 /*
550 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
551 * after probing for drives, to allocate partition tables and other data
552 * structures needed for the routines in genhd.c. ide_geninit() gets called
553 * somewhat later, during the partition check.
554 */
555 static void init_gendisk (ide_hwif_t *hwif)
/* */
556 {
557 struct gendisk *gd, **gdp;
558 unsigned int unit, units, minors;
559 int *bs;
560
561 /* figure out maximum drive number on the interface */
562 for (units = MAX_DRIVES; units > 0; --units) {
563 if (hwif->drives[units-1].present)
564 break;
565 }
566 minors = units * (1<<PARTN_BITS);
567 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
568 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
569 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
570 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
571
572 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
573 blksize_size[hwif->major] = bs;
574 for (unit = 0; unit < minors; ++unit)
575 *bs++ = BLOCK_SIZE;
576
577 for (unit = 0; unit < units; ++unit)
578 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
579
580 gd->major = hwif->major; /* our major device number */
581 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
582 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
583 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
584 gd->max_nr = units; /* max num real drives */
585 gd->nr_real = units; /* current num real drives */
586 gd->init = ide_geninit; /* initialization function */
587 gd->real_devices= hwif; /* ptr to internal data */
588 gd->next = NULL; /* linked list of major devs */
589
590 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
591 hwif->gd = *gdp = gd; /* link onto tail of list */
592 }
593
594 static void do_reset1 (ide_drive_t *, int); /* needed below */
595
596 #ifdef CONFIG_BLK_DEV_IDEATAPI
597 /*
598 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
599 * during an atapi drive reset operation. If the drive has not yet responded,
600 * and we have not yet hit our maximum waiting time, then the timer is restarted
601 * for another 50ms.
602 */
603 static void atapi_reset_pollfunc (ide_drive_t *drive)
/* */
604 {
605 ide_hwgroup_t *hwgroup = HWGROUP(drive);
606 byte stat;
607
608 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
609 udelay (10);
610
611 if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
612 printk("%s: ATAPI reset complete\n", drive->name);
613 } else {
614 if (jiffies < hwgroup->poll_timeout) {
615 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
616 return; /* continue polling */
617 }
618 hwgroup->poll_timeout = 0; /* end of polling */
619 printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
620 do_reset1 (drive, 1); /* do it the old fashioned way */
621 }
622 hwgroup->poll_timeout = 0; /* done polling */
623 }
624 #endif /* CONFIG_BLK_DEV_IDEATAPI */
625
626 /*
627 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
628 * during an ide reset operation. If the drives have not yet responded,
629 * and we have not yet hit our maximum waiting time, then the timer is restarted
630 * for another 50ms.
631 */
632 static void reset_pollfunc (ide_drive_t *drive)
/* */
633 {
634 ide_hwgroup_t *hwgroup = HWGROUP(drive);
635 ide_hwif_t *hwif = HWIF(drive);
636 byte tmp;
637
638 if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
639 if (jiffies < hwgroup->poll_timeout) {
640 ide_set_handler (drive, &reset_pollfunc, HZ/20);
641 return; /* continue polling */
642 }
643 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
644 } else {
645 printk("%s: reset: ", hwif->name);
646 if ((tmp = GET_ERR()) == 1)
647 printk("success\n");
648 else {
649 #if FANCY_STATUS_DUMPS
650 printk("master: ");
651 switch (tmp & 0x7f) {
652 case 1: printk("passed");
653 break;
654 case 2: printk("formatter device error");
655 break;
656 case 3: printk("sector buffer error");
657 break;
658 case 4: printk("ECC circuitry error");
659 break;
660 case 5: printk("controlling MPU error");
661 break;
662 default:printk("error (0x%02x?)", tmp);
663 }
664 if (tmp & 0x80)
665 printk("; slave: failed");
666 printk("\n");
667 #else
668 printk("failed\n");
669 #endif /* FANCY_STATUS_DUMPS */
670 }
671 }
672 hwgroup->poll_timeout = 0; /* done polling */
673 }
674
675 /*
676 * do_reset1() attempts to recover a confused drive by resetting it.
677 * Unfortunately, resetting a disk drive actually resets all devices on
678 * the same interface, so it can really be thought of as resetting the
679 * interface rather than resetting the drive.
680 *
681 * ATAPI devices have their own reset mechanism which allows them to be
682 * individually reset without clobbering other devices on the same interface.
683 *
684 * Unfortunately, the IDE interface does not generate an interrupt to let
685 * us know when the reset operation has finished, so we must poll for this.
686 * Equally poor, though, is the fact that this may a very long time to complete,
687 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
688 * we set a timer to poll at 50ms intervals.
689 */
690 static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* */
691 {
692 unsigned int unit;
693 unsigned long flags;
694 ide_hwif_t *hwif = HWIF(drive);
695 ide_hwgroup_t *hwgroup = HWGROUP(drive);
696
697 save_flags(flags);
698 cli(); /* Why ? */
699
700 #ifdef CONFIG_BLK_DEV_IDEATAPI
701 /* For an ATAPI device, first try an ATAPI SRST. */
702 if (drive->media != ide_disk) {
703 if (!do_not_try_atapi) {
704 if (!drive->keep_settings)
705 drive->unmask = 0;
706 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
707 udelay (20);
708 OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
709 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
710 ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
711 restore_flags (flags);
712 return;
713 }
714 }
715 #endif /* CONFIG_BLK_DEV_IDEATAPI */
716
717 /*
718 * First, reset any device state data we were maintaining
719 * for any of the drives on this interface.
720 */
721 for (unit = 0; unit < MAX_DRIVES; ++unit) {
722 ide_drive_t *rdrive = &hwif->drives[unit];
723 rdrive->special.all = 0;
724 rdrive->special.b.set_geometry = 1;
725 rdrive->special.b.recalibrate = 1;
726 if (OK_TO_RESET_CONTROLLER)
727 rdrive->mult_count = 0;
728 if (!rdrive->keep_settings) {
729 rdrive->mult_req = 0;
730 rdrive->unmask = 0;
731 if (rdrive->using_dma) {
732 rdrive->using_dma = 0;
733 printk("%s: disabled DMA\n", rdrive->name);
734 }
735 }
736 if (rdrive->mult_req != rdrive->mult_count)
737 rdrive->special.b.set_multmode = 1;
738 }
739
740 #if OK_TO_RESET_CONTROLLER
741 /*
742 * Note that we also set nIEN while resetting the device,
743 * to mask unwanted interrupts from the interface during the reset.
744 * However, due to the design of PC hardware, this will cause an
745 * immediate interrupt due to the edge transition it produces.
746 * This single interrupt gives us a "fast poll" for drives that
747 * recover from reset very quickly, saving us the first 50ms wait time.
748 */
749 OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
750 udelay(5); /* more than enough time */
751 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
752 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
753 ide_set_handler (drive, &reset_pollfunc, HZ/20);
754 #endif /* OK_TO_RESET_CONTROLLER */
755
756 restore_flags (flags);
757 }
758
759 /*
760 * ide_do_reset() is the entry point to the drive/interface reset code.
761 */
762 void ide_do_reset (ide_drive_t *drive)
/* */
763 {
764 do_reset1 (drive, 0);
765 #ifdef CONFIG_BLK_DEV_IDETAPE
766 if (drive->media == ide_tape)
767 drive->tape.reset_issued=1;
768 #endif /* CONFIG_BLK_DEV_IDETAPE */
769 }
770
771 /*
772 * Clean up after success/failure of an explicit drive cmd
773 */
774 void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
/* */
775 {
776 unsigned long flags;
777 struct request *rq = HWGROUP(drive)->rq;
778
779 if (rq->cmd == IDE_DRIVE_CMD) {
780 byte *args = (byte *) rq->buffer;
781 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
782 if (args) {
783 args[0] = stat;
784 args[1] = err;
785 args[2] = IN_BYTE(IDE_NSECTOR_REG);
786 }
787 }
788 save_flags(flags);
789 cli();
790 blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
791 HWGROUP(drive)->rq = NULL;
792 rq->rq_status = RQ_INACTIVE;
793 if (rq->sem != NULL)
794 up(rq->sem);
795 restore_flags(flags);
796 }
797
798 /*
799 * Error reporting, in human readable form (luxurious, but a memory hog).
800 */
801 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
/* */
802 {
803 unsigned long flags;
804 byte err = 0;
805
806 save_flags (flags);
807 sti();
808 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
809 #if FANCY_STATUS_DUMPS
810 if (drive->media == ide_disk) {
811 printk(" { ");
812 if (stat & BUSY_STAT)
813 printk("Busy ");
814 else {
815 if (stat & READY_STAT) printk("DriveReady ");
816 if (stat & WRERR_STAT) printk("DeviceFault ");
817 if (stat & SEEK_STAT) printk("SeekComplete ");
818 if (stat & DRQ_STAT) printk("DataRequest ");
819 if (stat & ECC_STAT) printk("CorrectedError ");
820 if (stat & INDEX_STAT) printk("Index ");
821 if (stat & ERR_STAT) printk("Error ");
822 }
823 printk("}");
824 }
825 #endif /* FANCY_STATUS_DUMPS */
826 printk("\n");
827 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
828 err = GET_ERR();
829 printk("%s: %s: error=0x%02x", drive->name, msg, err);
830 #if FANCY_STATUS_DUMPS
831 if (drive->media == ide_disk) {
832 printk(" { ");
833 if (err & BBD_ERR) printk("BadSector ");
834 if (err & ECC_ERR) printk("UncorrectableError ");
835 if (err & ID_ERR) printk("SectorIdNotFound ");
836 if (err & ABRT_ERR) printk("DriveStatusError ");
837 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
838 if (err & MARK_ERR) printk("AddrMarkNotFound ");
839 printk("}");
840 if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
841 byte cur = IN_BYTE(IDE_SELECT_REG);
842 if (cur & 0x40) { /* using LBA? */
843 printk(", LBAsect=%ld", (unsigned long)
844 ((cur&0xf)<<24)
845 |(IN_BYTE(IDE_HCYL_REG)<<16)
846 |(IN_BYTE(IDE_LCYL_REG)<<8)
847 | IN_BYTE(IDE_SECTOR_REG));
848 } else {
849 printk(", CHS=%d/%d/%d",
850 (IN_BYTE(IDE_HCYL_REG)<<8) +
851 IN_BYTE(IDE_LCYL_REG),
852 cur & 0xf,
853 IN_BYTE(IDE_SECTOR_REG));
854 }
855 if (HWGROUP(drive)->rq)
856 printk(", sector=%ld", HWGROUP(drive)->rq->sector);
857 }
858 }
859 #endif /* FANCY_STATUS_DUMPS */
860 printk("\n");
861 }
862 restore_flags (flags);
863 return err;
864 }
865
866 /*
867 * try_to_flush_leftover_data() is invoked in response to a drive
868 * unexpectedly having its DRQ_STAT bit set. As an alternative to
869 * resetting the drive, this routine tries to clear the condition
870 * by read a sector's worth of data from the drive. Of course,
871 * this may not help if the drive is *waiting* for data from *us*.
872 */
873 static void try_to_flush_leftover_data (ide_drive_t *drive)
/* */
874 {
875 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
876
877 while (i > 0) {
878 unsigned long buffer[16];
879 unsigned int wcount = (i > 16) ? 16 : i;
880 i -= wcount;
881 ide_input_data (drive, buffer, wcount);
882 }
883 }
884
885 /*
886 * ide_error() takes action based on the error returned by the controller.
887 */
888 void ide_error (ide_drive_t *drive, const char *msg, byte stat)
/* */
889 {
890 struct request *rq;
891 byte err;
892
893 err = ide_dump_status(drive, msg, stat);
894 if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
895 return;
896 /* retry only "normal" I/O: */
897 if (rq->cmd == IDE_DRIVE_CMD) {
898 rq->errors = 1;
899 ide_end_drive_cmd(drive, stat, err);
900 return;
901 }
902 if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
903 rq->errors |= ERROR_RESET;
904 } else {
905 if (drive->media == ide_disk && (stat & ERR_STAT)) {
906 /* err has different meaning on cdrom and tape */
907 if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
908 rq->errors = ERROR_MAX;
909 else if (err & TRK0_ERR) /* help it find track zero */
910 rq->errors |= ERROR_RECAL;
911 }
912 if ((stat & DRQ_STAT) && rq->cmd != WRITE)
913 try_to_flush_leftover_data(drive);
914 }
915 if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
916 rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
917
918 if (rq->errors >= ERROR_MAX) {
919 #ifdef CONFIG_BLK_DEV_IDETAPE
920 if (drive->media == ide_tape) {
921 rq->errors = 0;
922 idetape_end_request(0, HWGROUP(drive));
923 }
924 else
925 #endif /* CONFIG_BLK_DEV_IDETAPE */
926 ide_end_request(0, HWGROUP(drive));
927 }
928 else {
929 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
930 ++rq->errors;
931 ide_do_reset(drive);
932 return;
933 } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
934 drive->special.b.recalibrate = 1;
935 ++rq->errors;
936 }
937 }
938
939 /*
940 * read_intr() is the handler for disk read/multread interrupts
941 */
942 static void read_intr (ide_drive_t *drive)
/* */
943 {
944 byte stat;
945 int i;
946 unsigned int msect, nsect;
947 struct request *rq;
948
949 if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
950 ide_error(drive, "read_intr", stat);
951 return;
952 }
953 msect = drive->mult_count;
954 read_next:
955 rq = HWGROUP(drive)->rq;
956 if (msect) {
957 if ((nsect = rq->current_nr_sectors) > msect)
958 nsect = msect;
959 msect -= nsect;
960 } else
961 nsect = 1;
962 ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
963 #ifdef DEBUG
964 printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
965 drive->name, rq->sector, rq->sector+nsect-1,
966 (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
967 #endif
968 rq->sector += nsect;
969 rq->buffer += nsect<<9;
970 rq->errors = 0;
971 i = (rq->nr_sectors -= nsect);
972 if ((rq->current_nr_sectors -= nsect) <= 0)
973 ide_end_request(1, HWGROUP(drive));
974 if (i > 0) {
975 if (msect)
976 goto read_next;
977 ide_set_handler (drive, &read_intr, WAIT_CMD);
978 }
979 }
980
981 /*
982 * write_intr() is the handler for disk write interrupts
983 */
984 static void write_intr (ide_drive_t *drive)
/* */
985 {
986 byte stat;
987 int i;
988 ide_hwgroup_t *hwgroup = HWGROUP(drive);
989 struct request *rq = hwgroup->rq;
990
991 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
992 #ifdef DEBUG
993 printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
994 drive->name, rq->sector, (unsigned long) rq->buffer,
995 rq->nr_sectors-1);
996 #endif
997 if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
998 rq->sector++;
999 rq->buffer += 512;
1000 rq->errors = 0;
1001 i = --rq->nr_sectors;
1002 --rq->current_nr_sectors;
1003 if (rq->current_nr_sectors <= 0)
1004 ide_end_request(1, hwgroup);
1005 if (i > 0) {
1006 ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1007 ide_set_handler (drive, &write_intr, WAIT_CMD);
1008 }
1009 return;
1010 }
1011 }
1012 ide_error(drive, "write_intr", stat);
1013 }
1014
1015 /*
1016 * ide_multwrite() transfers a block of up to mcount sectors of data
1017 * to a drive as part of a disk multiple-sector write operation.
1018 */
1019 void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
/* */
1020 {
1021 struct request *rq = &HWGROUP(drive)->wrq;
1022
1023 do {
1024 unsigned int nsect = rq->current_nr_sectors;
1025 if (nsect > mcount)
1026 nsect = mcount;
1027 mcount -= nsect;
1028
1029 ide_output_data(drive, rq->buffer, nsect<<7);
1030 #ifdef DEBUG
1031 printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1032 drive->name, rq->sector, (unsigned long) rq->buffer,
1033 nsect, rq->nr_sectors - nsect);
1034 #endif
1035 if ((rq->nr_sectors -= nsect) <= 0)
1036 break;
1037 if ((rq->current_nr_sectors -= nsect) == 0) {
1038 if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1039 rq->current_nr_sectors = rq->bh->b_size>>9;
1040 rq->buffer = rq->bh->b_data;
1041 } else {
1042 panic("%s: buffer list corrupted\n", drive->name);
1043 break;
1044 }
1045 } else {
1046 rq->buffer += nsect << 9;
1047 }
1048 } while (mcount);
1049 }
1050
1051 /*
1052 * multwrite_intr() is the handler for disk multwrite interrupts
1053 */
1054 static void multwrite_intr (ide_drive_t *drive)
/* */
1055 {
1056 byte stat;
1057 int i;
1058 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1059 struct request *rq = &hwgroup->wrq;
1060
1061 if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1062 if (stat & DRQ_STAT) {
1063 if (rq->nr_sectors) {
1064 ide_multwrite(drive, drive->mult_count);
1065 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1066 return;
1067 }
1068 } else {
1069 if (!rq->nr_sectors) { /* all done? */
1070 rq = hwgroup->rq;
1071 for (i = rq->nr_sectors; i > 0;){
1072 i -= rq->current_nr_sectors;
1073 ide_end_request(1, hwgroup);
1074 }
1075 return;
1076 }
1077 }
1078 }
1079 ide_error(drive, "multwrite_intr", stat);
1080 }
1081
1082 /*
1083 * Issue a simple drive command
1084 * The drive must be selected beforehand.
1085 */
1086 static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
/* */
1087 {
1088 ide_set_handler (drive, handler, WAIT_CMD);
1089 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1090 OUT_BYTE(nsect,IDE_NSECTOR_REG);
1091 OUT_BYTE(cmd,IDE_COMMAND_REG);
1092 }
1093
1094 /*
1095 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1096 */
1097 static void set_multmode_intr (ide_drive_t *drive)
/* */
1098 {
1099 byte stat = GET_STAT();
1100
1101 sti();
1102 if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1103 drive->mult_count = drive->mult_req;
1104 } else {
1105 drive->mult_req = drive->mult_count = 0;
1106 drive->special.b.recalibrate = 1;
1107 (void) ide_dump_status(drive, "set_multmode", stat);
1108 }
1109 }
1110
1111 /*
1112 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1113 */
1114 static void set_geometry_intr (ide_drive_t *drive)
/* */
1115 {
1116 byte stat = GET_STAT();
1117
1118 sti();
1119 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1120 ide_error(drive, "set_geometry_intr", stat);
1121 }
1122
1123 /*
1124 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1125 */
1126 static void recal_intr (ide_drive_t *drive)
/* */
1127 {
1128 byte stat = GET_STAT();
1129
1130 sti();
1131 if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1132 ide_error(drive, "recal_intr", stat);
1133 }
1134
1135 /*
1136 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1137 */
1138 static void drive_cmd_intr (ide_drive_t *drive)
/* */
1139 {
1140 struct request *rq = HWGROUP(drive)->rq;
1141 byte *args = (byte *) rq->buffer;
1142 byte stat = GET_STAT();
1143
1144 sti();
1145 if ((stat & DRQ_STAT) && args && args[3]) {
1146 ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1147 stat = GET_STAT();
1148 }
1149 if (OK_STAT(stat,READY_STAT,BAD_STAT))
1150 ide_end_drive_cmd (drive, stat, GET_ERR());
1151 else
1152 ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1153 }
1154
1155 /*
1156 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1157 * commands to a drive. It used to do much more, but has been scaled back.
1158 */
1159 static inline void do_special (ide_drive_t *drive)
/* */
1160 {
1161 special_t *s = &drive->special;
1162 next:
1163 #ifdef DEBUG
1164 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1165 #endif
1166 if (s->b.set_geometry) {
1167 s->b.set_geometry = 0;
1168 if (drive->media == ide_disk) {
1169 OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1170 OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1171 OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1172 OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1173 if (!IS_PROMISE_DRIVE)
1174 ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1175 }
1176 } else if (s->b.recalibrate) {
1177 s->b.recalibrate = 0;
1178 if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1179 ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1180 } else if (s->b.set_pio) {
1181 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1182 s->b.set_pio = 0;
1183 if (tuneproc != NULL)
1184 tuneproc(drive, drive->pio_req);
1185 goto next;
1186 } else if (s->b.set_multmode) {
1187 s->b.set_multmode = 0;
1188 if (drive->media == ide_disk) {
1189 if (drive->id && drive->mult_req > drive->id->max_multsect)
1190 drive->mult_req = drive->id->max_multsect;
1191 if (!IS_PROMISE_DRIVE)
1192 ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1193 } else
1194 drive->mult_req = 0;
1195 } else if (s->all) {
1196 int special = s->all;
1197 s->all = 0;
1198 printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1199 }
1200 }
1201
1202 /*
1203 * This routine busy-waits for the drive status to be not "busy".
1204 * It then checks the status for all of the "good" bits and none
1205 * of the "bad" bits, and if all is okay it returns 0. All other
1206 * cases return 1 after invoking ide_error() -- caller should just return.
1207 *
1208 * This routine should get fixed to not hog the cpu during extra long waits..
1209 * That could be done by busy-waiting for the first jiffy or two, and then
1210 * setting a timer to wake up at half second intervals thereafter,
1211 * until timeout is achieved, before timing out.
1212 */
1213 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
/* */
1214 {
1215 byte stat;
1216 unsigned long flags;
1217
1218 test:
1219 udelay(1); /* spec allows drive 400ns to change "BUSY" */
1220 if (OK_STAT((stat = GET_STAT()), good, bad))
1221 return 0; /* fast exit for most frequent case */
1222 if (!(stat & BUSY_STAT)) {
1223 ide_error(drive, "status error", stat);
1224 return 1;
1225 }
1226
1227 save_flags(flags);
1228 sti();
1229 timeout += jiffies;
1230 do {
1231 if (!((stat = GET_STAT()) & BUSY_STAT)) {
1232 restore_flags(flags);
1233 goto test;
1234 }
1235 } while (jiffies <= timeout);
1236
1237 restore_flags(flags);
1238 ide_error(drive, "status timeout", GET_STAT());
1239 return 1;
1240 }
1241
1242 /*
1243 * do_rw_disk() issues READ and WRITE commands to a disk,
1244 * using LBA if supported, or CHS otherwise, to address sectors.
1245 * It also takes care of issuing special DRIVE_CMDs.
1246 */
1247 static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
/* */
1248 {
1249 ide_hwif_t *hwif = HWIF(drive);
1250 unsigned short io_base = hwif->io_base;
1251 #ifdef CONFIG_BLK_DEV_PROMISE
1252 int use_promise_io = 0;
1253 #endif /* CONFIG_BLK_DEV_PROMISE */
1254
1255 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1256 OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1257 #ifdef CONFIG_BLK_DEV_PROMISE
1258 if (IS_PROMISE_DRIVE) {
1259 if (hwif->is_promise2 || rq->cmd == READ) {
1260 use_promise_io = 1;
1261 }
1262 }
1263 if (drive->select.b.lba || use_promise_io) {
1264 #else /* !CONFIG_BLK_DEV_PROMISE */
1265 if (drive->select.b.lba) {
1266 #endif /* CONFIG_BLK_DEV_PROMISE */
1267 #ifdef DEBUG
1268 printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1269 drive->name, (rq->cmd==READ)?"read":"writ",
1270 block, rq->nr_sectors, (unsigned long) rq->buffer);
1271 #endif
1272 OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1273 OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1274 OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1275 OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1276 } else {
1277 unsigned int sect,head,cyl,track;
1278 track = block / drive->sect;
1279 sect = block % drive->sect + 1;
1280 OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1281 head = track % drive->head;
1282 cyl = track / drive->head;
1283 OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1284 OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1285 OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1286 #ifdef DEBUG
1287 printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1288 drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1289 head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1290 #endif
1291 }
1292 #ifdef CONFIG_BLK_DEV_PROMISE
1293 if (use_promise_io) {
1294 do_promise_io (drive, rq);
1295 return;
1296 }
1297 #endif /* CONFIG_BLK_DEV_PROMISE */
1298 if (rq->cmd == READ) {
1299 #ifdef CONFIG_BLK_DEV_TRITON
1300 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1301 return;
1302 #endif /* CONFIG_BLK_DEV_TRITON */
1303 ide_set_handler(drive, &read_intr, WAIT_CMD);
1304 OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1305 return;
1306 }
1307 if (rq->cmd == WRITE) {
1308 #ifdef CONFIG_BLK_DEV_TRITON
1309 if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1310 return;
1311 #endif /* CONFIG_BLK_DEV_TRITON */
1312 OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1313 if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1314 printk("%s: no DRQ after issuing %s\n", drive->name,
1315 drive->mult_count ? "MULTWRITE" : "WRITE");
1316 return;
1317 }
1318 if (!drive->unmask)
1319 cli();
1320 if (drive->mult_count) {
1321 HWGROUP(drive)->wrq = *rq; /* scratchpad */
1322 ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1323 ide_multwrite(drive, drive->mult_count);
1324 } else {
1325 ide_set_handler (drive, &write_intr, WAIT_CMD);
1326 ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1327 }
1328 return;
1329 }
1330 printk("%s: bad command: %d\n", drive->name, rq->cmd);
1331 ide_end_request(0, HWGROUP(drive));
1332 }
1333
1334 /*
1335 * execute_drive_cmd() issues a special drive command,
1336 * usually initiated by ioctl() from the external hdparm program.
1337 */
1338 static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
/* */
1339 {
1340 byte *args = rq->buffer;
1341 if (args) {
1342 #ifdef DEBUG
1343 printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1344 drive->name, args[0], args[1], args[2], args[3]);
1345 #endif
1346 OUT_BYTE(args[2],IDE_FEATURE_REG);
1347 ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1348 return;
1349 } else {
1350 /*
1351 * NULL is actually a valid way of waiting for
1352 * all current requests to be flushed from the queue.
1353 */
1354 #ifdef DEBUG
1355 printk("%s: DRIVE_CMD (null)\n", drive->name);
1356 #endif
1357 ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1358 return;
1359 }
1360 }
1361
1362 /*
1363 * do_request() initiates handling of a new I/O request
1364 */
1365 static inline void do_request (ide_hwif_t *hwif, struct request *rq)
/* */
1366 {
1367 unsigned int minor, unit;
1368 unsigned long block, blockend;
1369 ide_drive_t *drive;
1370
1371 sti();
1372 #ifdef DEBUG
1373 printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1374 #endif
1375 minor = MINOR(rq->rq_dev);
1376 unit = minor >> PARTN_BITS;
1377 if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1378 printk("%s: bad device number: %s\n",
1379 hwif->name, kdevname(rq->rq_dev));
1380 goto kill_rq;
1381 }
1382 drive = &hwif->drives[unit];
1383 #ifdef DEBUG
1384 if (rq->bh && !buffer_locked(rq->bh)) {
1385 printk("%s: block not locked\n", drive->name);
1386 goto kill_rq;
1387 }
1388 #endif
1389 block = rq->sector;
1390 blockend = block + rq->nr_sectors;
1391 if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1392 printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1393 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1394 goto kill_rq;
1395 }
1396 block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1397 #if FAKE_FDISK_FOR_EZDRIVE
1398 if (block == 0 && drive->remap_0_to_1)
1399 block = 1; /* redirect MBR access to EZ-Drive partn table */
1400 #endif /* FAKE_FDISK_FOR_EZDRIVE */
1401 ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1402 #if (DISK_RECOVERY_TIME > 0)
1403 while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1404 #endif
1405
1406 #ifdef CONFIG_BLK_DEV_IDETAPE
1407 POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1408 #endif /* CONFIG_BLK_DEV_IDETAPE */
1409
1410 SELECT_DRIVE(hwif,drive);
1411 if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1412 printk("%s: drive not ready for command\n", drive->name);
1413 return;
1414 }
1415
1416 if (!drive->special.all) {
1417 if (rq->cmd == IDE_DRIVE_CMD) {
1418 execute_drive_cmd(drive, rq);
1419 return;
1420 }
1421 #ifdef CONFIG_BLK_DEV_IDEATAPI
1422 switch (drive->media) {
1423 case ide_disk:
1424 do_rw_disk (drive, rq, block);
1425 return;
1426 #ifdef CONFIG_BLK_DEV_IDECD
1427 case ide_cdrom:
1428 ide_do_rw_cdrom (drive, block);
1429 return;
1430 #endif /* CONFIG_BLK_DEV_IDECD */
1431 #ifdef CONFIG_BLK_DEV_IDETAPE
1432 case ide_tape:
1433 idetape_do_request (drive, rq, block);
1434 return;
1435 #endif /* CONFIG_BLK_DEV_IDETAPE */
1436
1437 default:
1438 printk("%s: media type %d not supported\n",
1439 drive->name, drive->media);
1440 goto kill_rq;
1441 }
1442 #else
1443 do_rw_disk (drive, rq, block); /* simpler and faster */
1444 return;
1445 #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1446 }
1447 do_special(drive);
1448 return;
1449 kill_rq:
1450 ide_end_request(0, hwif->hwgroup);
1451 }
1452
1453 /*
1454 * The driver enables interrupts as much as possible. In order to do this,
1455 * (a) the device-interrupt is always masked before entry, and
1456 * (b) the timeout-interrupt is always disabled before entry.
1457 *
1458 * If we enter here from, say irq14, and then start a new request for irq15,
1459 * (possible with "serialize" option) then we cannot ensure that we exit
1460 * before the irq15 hits us. So, we must be careful not to let this bother us.
1461 *
1462 * Interrupts are still masked (by default) whenever we are exchanging
1463 * data/cmds with a drive, because some drives seem to have very poor
1464 * tolerance for latency during I/O. For devices which don't suffer from
1465 * this problem (most don't), the unmask flag can be set using the "hdparm"
1466 * utility, to permit other interrupts during data/cmd transfers.
1467 */
1468 void ide_do_request (ide_hwgroup_t *hwgroup)
/* */
1469 {
1470 cli(); /* paranoia */
1471 if (hwgroup->handler != NULL) {
1472 printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1473 return;
1474 }
1475 do {
1476 ide_hwif_t *hwif = hwgroup->hwif;
1477 struct request *rq;
1478 if ((rq = hwgroup->rq) == NULL) {
1479 /*
1480 * hwgroup->next_hwif is different from hwgroup->hwif
1481 * only when a request is inserted using "ide_next".
1482 * This saves wear and tear on IDE tapes.
1483 */
1484 hwif = hwgroup->next_hwif;
1485 do {
1486 rq = blk_dev[hwif->major].current_request;
1487 if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1488 goto got_rq;
1489 } while ((hwif = hwif->next) != hwgroup->next_hwif);
1490 return; /* no work left for this hwgroup */
1491 }
1492 got_rq:
1493 do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1494 cli();
1495 } while (hwgroup->handler == NULL);
1496 }
1497
1498 /*
1499 * do_hwgroup_request() invokes ide_do_request() after first masking
1500 * all possible interrupts for the current hwgroup. This prevents race
1501 * conditions in the event that an unexpected interrupt occurs while
1502 * we are in the driver.
1503 *
1504 * Note that when an interrupt is used to reenter the driver, the first level
1505 * handler will already have masked the irq that triggered, but any other ones
1506 * for the hwgroup will still be unmasked. The driver tries to be careful
1507 * about such things.
1508 */
1509 static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
/* */
1510 {
1511 if (hwgroup->handler == NULL) {
1512 ide_hwif_t *hgif = hwgroup->hwif;
1513 ide_hwif_t *hwif = hgif;
1514 do {
1515 disable_irq(hwif->irq);
1516 } while ((hwif = hwif->next) != hgif);
1517 ide_do_request (hwgroup);
1518 do {
1519 enable_irq(hwif->irq);
1520 } while ((hwif = hwif->next) != hgif);
1521 }
1522 }
1523
1524 static void do_ide0_request (void) /* invoked with cli() */
/* */
1525 {
1526 do_hwgroup_request (ide_hwifs[0].hwgroup);
1527 }
1528
1529 #if MAX_HWIFS > 1
1530 static void do_ide1_request (void) /* invoked with cli() */
/* */
1531 {
1532 do_hwgroup_request (ide_hwifs[1].hwgroup);
1533 }
1534 #endif
1535
1536 #if MAX_HWIFS > 2
1537 static void do_ide2_request (void) /* invoked with cli() */
/* */
1538 {
1539 do_hwgroup_request (ide_hwifs[2].hwgroup);
1540 }
1541 #endif
1542
1543 #if MAX_HWIFS > 3
1544 static void do_ide3_request (void) /* invoked with cli() */
/* */
1545 {
1546 do_hwgroup_request (ide_hwifs[3].hwgroup);
1547 }
1548 #endif
1549
1550 static void timer_expiry (unsigned long data)
/* */
1551 {
1552 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1553 ide_drive_t *drive = hwgroup->drive;
1554 unsigned long flags;
1555
1556 save_flags(flags);
1557 cli();
1558
1559 if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1560 ide_handler_t *handler = hwgroup->handler;
1561 hwgroup->handler = NULL;
1562 handler(drive);
1563 } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1564 sti(); /* drive must have responded just as the timer expired */
1565 printk("%s: marginal timeout\n", drive->name);
1566 } else {
1567 hwgroup->handler = NULL; /* abort the operation */
1568 if (hwgroup->hwif->dmaproc)
1569 (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1570 ide_error(drive, "irq timeout", GET_STAT());
1571 }
1572 if (hwgroup->handler == NULL)
1573 do_hwgroup_request (hwgroup);
1574 restore_flags(flags);
1575 }
1576
1577 /*
1578 * There's nothing really useful we can do with an unexpected interrupt,
1579 * other than reading the status register (to clear it), and logging it.
1580 * There should be no way that an irq can happen before we're ready for it,
1581 * so we needn't worry much about losing an "important" interrupt here.
1582 *
1583 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1584 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1585 * "good", we just ignore the interrupt completely.
1586 *
1587 * This routine assumes cli() is in effect when called.
1588 *
1589 * If an unexpected interrupt happens on irq15 while we are handling irq14
1590 * and if the two interfaces are "serialized" (CMD640), then it looks like
1591 * we could screw up by interfering with a new request being set up for irq15.
1592 *
1593 * In reality, this is a non-issue. The new command is not sent unless the
1594 * drive is ready to accept one, in which case we know the drive is not
1595 * trying to interrupt us. And ide_set_handler() is always invoked before
1596 * completing the issuance of any new drive command, so we will not be
1597 * accidently invoked as a result of any valid command completion interrupt.
1598 *
1599 */
1600 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
/* */
1601 {
1602 byte stat;
1603 unsigned int unit;
1604 ide_hwif_t *hwif = hwgroup->hwif;
1605
1606 /*
1607 * handle the unexpected interrupt
1608 */
1609 do {
1610 if (hwif->irq == irq) {
1611 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1612 ide_drive_t *drive = &hwif->drives[unit];
1613 if (!drive->present)
1614 continue;
1615 SELECT_DRIVE(hwif,drive);
1616 if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1617 (void) ide_dump_status(drive, "unexpected_intr", stat);
1618 if ((stat & DRQ_STAT))
1619 try_to_flush_leftover_data(drive);
1620 }
1621 }
1622 } while ((hwif = hwif->next) != hwgroup->hwif);
1623 SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1624 }
1625
1626 /*
1627 * entry point for all interrupts, caller does cli() for us
1628 */
1629 void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1630 {
1631 ide_hwgroup_t *hwgroup = dev_id;
1632 ide_handler_t *handler;
1633
1634 if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1635 ide_drive_t *drive = hwgroup->drive;
1636 hwgroup->handler = NULL;
1637 del_timer(&(hwgroup->timer));
1638 if (drive->unmask)
1639 sti();
1640 handler(drive);
1641 cli(); /* this is necessary, as next rq may be different irq */
1642 if (hwgroup->handler == NULL) {
1643 SET_RECOVERY_TIMER(HWIF(drive));
1644 ide_do_request(hwgroup);
1645 }
1646 } else {
1647 unexpected_intr(irq, hwgroup);
1648 }
1649 cli();
1650 }
1651
1652 /*
1653 * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1654 * It returns NULL if the given device number does not match any present drives.
1655 */
1656 static ide_drive_t *get_info_ptr (kdev_t i_rdev)
/* */
1657 {
1658 int major = MAJOR(i_rdev);
1659 unsigned int h;
1660
1661 for (h = 0; h < MAX_HWIFS; ++h) {
1662 ide_hwif_t *hwif = &ide_hwifs[h];
1663 if (hwif->present && major == hwif->major) {
1664 unsigned unit = DEVICE_NR(i_rdev);
1665 if (unit < MAX_DRIVES) {
1666 ide_drive_t *drive = &hwif->drives[unit];
1667 if (drive->present)
1668 return drive;
1669 } else if (major == IDE0_MAJOR && unit < 4) {
1670 printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1671 printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1672 }
1673 break;
1674 }
1675 }
1676 return NULL;
1677 }
1678
1679 /*
1680 * This function is intended to be used prior to invoking ide_do_drive_cmd().
1681 */
1682 void ide_init_drive_cmd (struct request *rq)
/* */
1683 {
1684 rq->buffer = NULL;
1685 rq->cmd = IDE_DRIVE_CMD;
1686 rq->sector = 0;
1687 rq->nr_sectors = 0;
1688 rq->current_nr_sectors = 0;
1689 rq->sem = NULL;
1690 rq->bh = NULL;
1691 rq->bhtail = NULL;
1692 rq->next = NULL;
1693
1694 #if 0 /* these are done each time through ide_do_drive_cmd() */
1695 rq->errors = 0;
1696 rq->rq_status = RQ_ACTIVE;
1697 rq->rq_dev = ????;
1698 #endif
1699 }
1700
1701 /*
1702 * This function issues a special IDE device request
1703 * onto the request queue.
1704 *
1705 * If action is ide_wait, then then rq is queued at the end of
1706 * the request queue, and the function sleeps until it has been
1707 * processed. This is for use when invoked from an ioctl handler.
1708 *
1709 * If action is ide_preempt, then the rq is queued at the head of
1710 * the request queue, displacing the currently-being-processed
1711 * request and this function returns immediately without waiting
1712 * for the new rq to be completed. This is VERY DANGEROUS, and is
1713 * intended for careful use by the ATAPI tape/cdrom driver code.
1714 *
1715 * If action is ide_next, then the rq is queued immediately after
1716 * the currently-being-processed-request (if any), and the function
1717 * returns without waiting for the new rq to be completed. As above,
1718 * This is VERY DANGEROUS, and is intended for careful use by the
1719 * ATAPI tape/cdrom driver code.
1720 *
1721 * If action is ide_end, then the rq is queued at the end of the
1722 * request queue, and the function returns immediately without waiting
1723 * for the new rq to be completed. This is again intended for careful
1724 * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1725 * when operating in the pipelined operation mode).
1726 */
1727 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
/* */
1728 {
1729 unsigned long flags;
1730 unsigned int major = HWIF(drive)->major;
1731 struct request *cur_rq;
1732 struct blk_dev_struct *bdev = &blk_dev[major];
1733 struct semaphore sem = MUTEX_LOCKED;
1734
1735 if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1736 return -ENOSYS; /* special drive cmds not supported */
1737 rq->errors = 0;
1738 rq->rq_status = RQ_ACTIVE;
1739 rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1740 if (action == ide_wait)
1741 rq->sem = &sem;
1742 unplug_device(bdev);
1743
1744 save_flags(flags);
1745 cli();
1746 if (action == ide_next)
1747 HWGROUP(drive)->next_hwif = HWIF(drive);
1748 cur_rq = bdev->current_request;
1749
1750 if (cur_rq == NULL || action == ide_preempt) {
1751 rq->next = cur_rq;
1752 bdev->current_request = rq;
1753 if (action == ide_preempt) {
1754 HWGROUP(drive)->rq = NULL;
1755 } else
1756 if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1757 bdev->request_fn();
1758 cli();
1759 }
1760 } else {
1761 if (action == ide_wait || action == ide_end) {
1762 while (cur_rq->next != NULL) /* find end of list */
1763 cur_rq = cur_rq->next;
1764 }
1765 rq->next = cur_rq->next;
1766 cur_rq->next = rq;
1767 }
1768 if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1769 down(&sem); /* wait for it to be serviced */
1770 restore_flags(flags);
1771 return rq->errors ? -EIO : 0; /* return -EIO if errors */
1772 }
1773
1774 static int ide_open(struct inode * inode, struct file * filp)
/* */
1775 {
1776 ide_drive_t *drive;
1777 unsigned long flags;
1778
1779 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1780 return -ENODEV;
1781 save_flags(flags);
1782 cli();
1783 while (drive->busy)
1784 sleep_on(&drive->wqueue);
1785 drive->usage++;
1786 restore_flags(flags);
1787 #ifdef CONFIG_BLK_DEV_IDECD
1788 if (drive->media == ide_cdrom)
1789 return ide_cdrom_open (inode, filp, drive);
1790 #endif /* CONFIG_BLK_DEV_IDECD */
1791 #ifdef CONFIG_BLK_DEV_IDETAPE
1792 if (drive->media == ide_tape)
1793 return idetape_blkdev_open (inode, filp, drive);
1794 #endif /* CONFIG_BLK_DEV_IDETAPE */
1795 if (drive->removable) {
1796 byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1797 struct request rq;
1798 check_disk_change(inode->i_rdev);
1799 ide_init_drive_cmd (&rq);
1800 rq.buffer = door_lock;
1801 /*
1802 * Ignore the return code from door_lock,
1803 * since the open() has already succeeded,
1804 * and the door_lock is irrelevant at this point.
1805 */
1806 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1807 }
1808 return 0;
1809 }
1810
1811 /*
1812 * Releasing a block device means we sync() it, so that it can safely
1813 * be forgotten about...
1814 */
1815 static void ide_release(struct inode * inode, struct file * file)
/* */
1816 {
1817 ide_drive_t *drive;
1818
1819 if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1820 fsync_dev(inode->i_rdev);
1821 drive->usage--;
1822 #ifdef CONFIG_BLK_DEV_IDECD
1823 if (drive->media == ide_cdrom) {
1824 ide_cdrom_release (inode, file, drive);
1825 return;
1826 }
1827 #endif /* CONFIG_BLK_DEV_IDECD */
1828 #ifdef CONFIG_BLK_DEV_IDETAPE
1829 if (drive->media == ide_tape) {
1830 idetape_blkdev_release (inode, file, drive);
1831 return;
1832 }
1833 #endif /* CONFIG_BLK_DEV_IDETAPE */
1834 if (drive->removable && !drive->usage) {
1835 byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1836 struct request rq;
1837 invalidate_buffers(inode->i_rdev);
1838 ide_init_drive_cmd (&rq);
1839 rq.buffer = door_unlock;
1840 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1841 }
1842 }
1843 }
1844
1845 /*
1846 * This routine is called to flush all partitions and partition tables
1847 * for a changed disk, and then re-read the new partition table.
1848 * If we are revalidating a disk because of a media change, then we
1849 * enter with usage == 0. If we are using an ioctl, we automatically have
1850 * usage == 1 (we need an open channel to use an ioctl :-), so this
1851 * is our limit.
1852 */
1853 static int revalidate_disk(kdev_t i_rdev)
/* */
1854 {
1855 ide_drive_t *drive;
1856 unsigned int p, major, minor;
1857 long flags;
1858
1859 if ((drive = get_info_ptr(i_rdev)) == NULL)
1860 return -ENODEV;
1861
1862 major = MAJOR(i_rdev);
1863 minor = drive->select.b.unit << PARTN_BITS;
1864 save_flags(flags);
1865 cli();
1866 if (drive->busy || (drive->usage > 1)) {
1867 restore_flags(flags);
1868 return -EBUSY;
1869 };
1870 drive->busy = 1;
1871 restore_flags(flags);
1872
1873 for (p = 0; p < (1<<PARTN_BITS); ++p) {
1874 if (drive->part[p].nr_sects > 0) {
1875 kdev_t devp = MKDEV(major, minor+p);
1876 sync_dev (devp);
1877 invalidate_inodes (devp);
1878 invalidate_buffers (devp);
1879 }
1880 drive->part[p].start_sect = 0;
1881 drive->part[p].nr_sects = 0;
1882 };
1883
1884 drive->part[0].nr_sects = current_capacity(drive);
1885 if (drive->media == ide_disk)
1886 resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1887
1888 drive->busy = 0;
1889 wake_up(&drive->wqueue);
1890 return 0;
1891 }
1892
1893 static int write_fs_long (unsigned long useraddr, long value)
/* */
1894 {
1895 int err;
1896
1897 if (NULL == (long *)useraddr)
1898 return -EINVAL;
1899 if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1900 return err;
1901 put_user((unsigned)value, (long *) useraddr);
1902 return 0;
1903 }
1904
1905 static int ide_ioctl (struct inode *inode, struct file *file,
/* */
1906 unsigned int cmd, unsigned long arg)
1907 {
1908 int err;
1909 ide_drive_t *drive;
1910 unsigned long flags;
1911 struct request rq;
1912
1913 if (!inode || !(inode->i_rdev))
1914 return -EINVAL;
1915 if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1916 return -ENODEV;
1917 ide_init_drive_cmd (&rq);
1918 switch (cmd) {
1919 case HDIO_GETGEO:
1920 {
1921 struct hd_geometry *loc = (struct hd_geometry *) arg;
1922 if (!loc || drive->media != ide_disk) return -EINVAL;
1923 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1924 if (err) return err;
1925 put_user(drive->bios_head, (byte *) &loc->heads);
1926 put_user(drive->bios_sect, (byte *) &loc->sectors);
1927 put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1928 put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1929 (unsigned long *) &loc->start);
1930 return 0;
1931 }
1932 case BLKFLSBUF:
1933 if (!suser()) return -EACCES;
1934 fsync_dev(inode->i_rdev);
1935 invalidate_buffers(inode->i_rdev);
1936 return 0;
1937
1938 case BLKRASET:
1939 if (!suser()) return -EACCES;
1940 if(arg > 0xff) return -EINVAL;
1941 read_ahead[MAJOR(inode->i_rdev)] = arg;
1942 return 0;
1943
1944 case BLKRAGET:
1945 return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1946
1947 case BLKGETSIZE: /* Return device size */
1948 return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1949 case BLKRRPART: /* Re-read partition tables */
1950 if (!suser()) return -EACCES;
1951 return revalidate_disk(inode->i_rdev);
1952
1953 case HDIO_GET_KEEPSETTINGS:
1954 return write_fs_long(arg, drive->keep_settings);
1955
1956 case HDIO_GET_UNMASKINTR:
1957 return write_fs_long(arg, drive->unmask);
1958
1959 case HDIO_GET_DMA:
1960 return write_fs_long(arg, drive->using_dma);
1961
1962 case HDIO_GET_32BIT:
1963 return write_fs_long(arg, drive->io_32bit);
1964
1965 case HDIO_GET_MULTCOUNT:
1966 return write_fs_long(arg, drive->mult_count);
1967
1968 case HDIO_GET_IDENTITY:
1969 if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1970 return -EINVAL;
1971 if (drive->id == NULL)
1972 return -ENOMSG;
1973 err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1974 if (!err)
1975 memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1976 return err;
1977
1978 case HDIO_GET_NOWERR:
1979 return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1980
1981 case HDIO_SET_DMA:
1982 if (!suser()) return -EACCES;
1983 #ifdef CONFIG_BLK_DEV_IDECD
1984 if (drive->media == ide_cdrom)
1985 return -EPERM;
1986 #endif /* CONFIG_BLK_DEV_IDECD */
1987 if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1988 return -EPERM;
1989 case HDIO_SET_KEEPSETTINGS:
1990 case HDIO_SET_UNMASKINTR:
1991 case HDIO_SET_NOWERR:
1992 if (arg > 1)
1993 return -EINVAL;
1994 case HDIO_SET_32BIT:
1995 if (!suser()) return -EACCES;
1996 if ((MINOR(inode->i_rdev) & PARTN_MASK))
1997 return -EINVAL;
1998 save_flags(flags);
1999 cli();
2000 switch (cmd) {
2001 case HDIO_SET_DMA:
2002 if (!(HWIF(drive)->dmaproc)) {
2003 restore_flags(flags);
2004 return -EPERM;
2005 }
2006 drive->using_dma = arg;
2007 break;
2008 case HDIO_SET_KEEPSETTINGS:
2009 drive->keep_settings = arg;
2010 break;
2011 case HDIO_SET_UNMASKINTR:
2012 if (arg && HWIF(drive)->no_unmask) {
2013 restore_flags(flags);
2014 return -EPERM;
2015 }
2016 drive->unmask = arg;
2017 break;
2018 case HDIO_SET_NOWERR:
2019 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2020 break;
2021 case HDIO_SET_32BIT:
2022 if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
2023 return -EINVAL;
2024 drive->io_32bit = arg;
2025 #ifdef CONFIG_BLK_DEV_DTC2278
2026 if (HWIF(drive)->chipset == ide_dtc2278)
2027 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2028 #endif /* CONFIG_BLK_DEV_DTC2278 */
2029 break;
2030 }
2031 restore_flags(flags);
2032 return 0;
2033
2034 case HDIO_SET_MULTCOUNT:
2035 if (!suser()) return -EACCES;
2036 if (MINOR(inode->i_rdev) & PARTN_MASK)
2037 return -EINVAL;
2038 if (drive->id && arg > drive->id->max_multsect)
2039 return -EINVAL;
2040 save_flags(flags);
2041 cli();
2042 if (drive->special.b.set_multmode) {
2043 restore_flags(flags);
2044 return -EBUSY;
2045 }
2046 drive->mult_req = arg;
2047 drive->special.b.set_multmode = 1;
2048 restore_flags(flags);
2049 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2050 return (drive->mult_count == arg) ? 0 : -EIO;
2051
2052 case HDIO_DRIVE_CMD:
2053 {
2054 byte args[4], *argbuf = args;
2055 int argsize = 4;
2056 if (!suser()) return -EACCES;
2057 if (NULL == (void *) arg) {
2058 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2059 } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2060 memcpy_fromfs(args, (void *)arg, 4);
2061 if (args[3]) {
2062 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2063 argbuf = kmalloc(argsize, GFP_KERNEL);
2064 if (argbuf == NULL)
2065 return -ENOMEM;
2066 argbuf[0] = args[0];
2067 argbuf[1] = args[1];
2068 argbuf[2] = args[2];
2069 argbuf[3] = args[3];
2070 }
2071 if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2072 rq.buffer = argbuf;
2073 err = ide_do_drive_cmd(drive, &rq, ide_wait);
2074 memcpy_tofs((void *)arg, argbuf, argsize);
2075 }
2076 if (argsize > 4)
2077 kfree(argbuf);
2078 }
2079 return err;
2080 }
2081 case HDIO_SET_PIO_MODE:
2082 if (!suser()) return -EACCES;
2083 if (MINOR(inode->i_rdev) & PARTN_MASK)
2084 return -EINVAL;
2085 if (!HWIF(drive)->tuneproc)
2086 return -ENOSYS;
2087 save_flags(flags);
2088 cli();
2089 drive->pio_req = (int) arg;
2090 drive->special.b.set_pio = 1;
2091 restore_flags(flags);
2092 return 0;
2093
2094 RO_IOCTLS(inode->i_rdev, arg);
2095
2096 default:
2097 #ifdef CONFIG_BLK_DEV_IDECD
2098 if (drive->media == ide_cdrom)
2099 return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2100 #endif /* CONFIG_BLK_DEV_IDECD */
2101 #ifdef CONFIG_BLK_DEV_IDETAPE
2102 if (drive->media == ide_tape)
2103 return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2104 #endif /* CONFIG_BLK_DEV_IDETAPE */
2105 return -EPERM;
2106 }
2107 }
2108
2109 static int ide_check_media_change (kdev_t i_rdev)
/* */
2110 {
2111 ide_drive_t *drive;
2112
2113 if ((drive = get_info_ptr(i_rdev)) == NULL)
2114 return -ENODEV;
2115 #ifdef CONFIG_BLK_DEV_IDECD
2116 if (drive->media == ide_cdrom)
2117 return ide_cdrom_check_media_change (drive);
2118 #endif /* CONFIG_BLK_DEV_IDECD */
2119 if (drive->removable) /* for disks */
2120 return 1; /* always assume it was changed */
2121 return 0;
2122 }
2123
2124 void ide_fixstring (byte *s, const int bytecount, const int byteswap)
/* */
2125 {
2126 byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2127
2128 if (byteswap) {
2129 /* convert from big-endian to host byte order */
2130 for (p = end ; p != s;) {
2131 unsigned short *pp = (unsigned short *) (p -= 2);
2132 *pp = ntohs(*pp);
2133 }
2134 }
2135
2136 /* strip leading blanks */
2137 while (s != end && *s == ' ')
2138 ++s;
2139
2140 /* compress internal blanks and strip trailing blanks */
2141 while (s != end && *s) {
2142 if (*s++ != ' ' || (s != end && *s && *s != ' '))
2143 *p++ = *(s-1);
2144 }
2145
2146 /* wipe out trailing garbage */
2147 while (p != end)
2148 *p++ = '\0';
2149 }
2150
2151 static inline void do_identify (ide_drive_t *drive, byte cmd)
/* */
2152 {
2153 int bswap;
2154 struct hd_driveid *id;
2155 unsigned long capacity, check;
2156
2157 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2158 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2159 sti();
2160
2161 /*
2162 * EATA SCSI controllers do a hardware ATA emulation: ignore them
2163 */
2164 if ((id->model[0] == 'P' && id->model[1] == 'M')
2165 || (id->model[0] == 'S' && id->model[1] == 'K')) {
2166 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2167 drive->present = 0;
2168 return;
2169 }
2170
2171 /*
2172 * WIN_IDENTIFY returns little-endian info,
2173 * WIN_PIDENTIFY *usually* returns little-endian info.
2174 */
2175 bswap = 1;
2176 if (cmd == WIN_PIDENTIFY) {
2177 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2178 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2179 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2180 bswap = 0; /* Vertos drives may still be weird */
2181 }
2182 ide_fixstring (id->model, sizeof(id->model), bswap);
2183 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2184 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2185
2186 #ifdef CONFIG_BLK_DEV_IDEATAPI
2187 /*
2188 * Check for an ATAPI device
2189 */
2190 if (cmd == WIN_PIDENTIFY) {
2191 byte type = (id->config >> 8) & 0x1f;
2192 printk("%s: %s, ATAPI ", drive->name, id->model);
2193 #ifdef CONFIG_BLK_DEV_PROMISE
2194 if (HWIF(drive)->is_promise2) {
2195 printk(" -- not supported on 2nd Promise port\n");
2196 drive->present = 0;
2197 return;
2198 }
2199 #endif /* CONFIG_BLK_DEV_PROMISE */
2200 switch (type) {
2201 case 0: /* Early cdrom models used zero */
2202 case 5:
2203 #ifdef CONFIG_BLK_DEV_IDECD
2204 printk ("CDROM drive\n");
2205 drive->media = ide_cdrom;
2206 drive->present = 1;
2207 drive->removable = 1;
2208 return;
2209 #else
2210 printk ("CDROM ");
2211 break;
2212 #endif /* CONFIG_BLK_DEV_IDECD */
2213 case 1:
2214 #ifdef CONFIG_BLK_DEV_IDETAPE
2215 printk ("TAPE drive");
2216 if (idetape_identify_device (drive,id)) {
2217 drive->media = ide_tape;
2218 drive->present = 1;
2219 drive->removable = 1;
2220 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2221 if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
2222 printk(", DMA");
2223 }
2224 printk("\n");
2225 }
2226 else {
2227 drive->present = 0;
2228 printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2229 }
2230 return;
2231 #else
2232 printk ("TAPE ");
2233 break;
2234 #endif /* CONFIG_BLK_DEV_IDETAPE */
2235 default:
2236 drive->present = 0;
2237 printk("Type %d - Unknown device\n", type);
2238 return;
2239 }
2240 drive->present = 0;
2241 printk("- not supported by this kernel\n");
2242 return;
2243 }
2244 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2245
2246 /* check for removable disks (eg. SYQUEST), ignore 'WD' drives */
2247 if (id->config & (1<<7)) { /* removable disk ? */
2248 if (id->model[0] != 'W' || id->model[1] != 'D')
2249 drive->removable = 1;
2250 }
2251
2252 /* SunDisk drives: treat as non-removable, force one unit */
2253 if (id->model[0] == 'S' && id->model[1] == 'u') {
2254 drive->removable = 0;
2255 if (drive->select.all & (1<<4)) {
2256 drive->present = 0;
2257 return;
2258 }
2259 }
2260
2261 drive->media = ide_disk;
2262 /* Extract geometry if we did not already have one for the drive */
2263 if (!drive->present) {
2264 drive->present = 1;
2265 drive->cyl = drive->bios_cyl = id->cyls;
2266 drive->head = drive->bios_head = id->heads;
2267 drive->sect = drive->bios_sect = id->sectors;
2268 }
2269 /* Handle logical geometry translation by the drive */
2270 if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2271 && (id->cur_heads <= 16) && id->cur_sectors)
2272 {
2273 /*
2274 * Extract the physical drive geometry for our use.
2275 * Note that we purposely do *not* update the bios info.
2276 * This way, programs that use it (like fdisk) will
2277 * still have the same logical view as the BIOS does,
2278 * which keeps the partition table from being screwed.
2279 *
2280 * An exception to this is the cylinder count,
2281 * which we reexamine later on to correct for 1024 limitations.
2282 */
2283 drive->cyl = id->cur_cyls;
2284 drive->head = id->cur_heads;
2285 drive->sect = id->cur_sectors;
2286
2287 /* check for word-swapped "capacity" field in id information */
2288 capacity = drive->cyl * drive->head * drive->sect;
2289 check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2290 if (check == capacity) { /* was it swapped? */
2291 /* yes, bring it into little-endian order: */
2292 id->cur_capacity0 = (capacity >> 0) & 0xffff;
2293 id->cur_capacity1 = (capacity >> 16) & 0xffff;
2294 }
2295 }
2296 /* Use physical geometry if what we have still makes no sense */
2297 if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2298 drive->cyl = id->cyls;
2299 drive->head = id->heads;
2300 drive->sect = id->sectors;
2301 }
2302 /* Correct the number of cyls if the bios value is too small */
2303 if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2304 if (drive->cyl > drive->bios_cyl)
2305 drive->bios_cyl = drive->cyl;
2306 }
2307
2308 (void) current_capacity (drive); /* initialize LBA selection */
2309
2310 printk ("%s: %.40s, %ldMB w/%dkB Cache, %sCHS=%d/%d/%d",
2311 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2312 drive->select.b.lba ? "LBA, " : "",
2313 drive->bios_cyl, drive->bios_head, drive->bios_sect);
2314
2315 drive->mult_count = 0;
2316 if (id->max_multsect) {
2317 drive->mult_req = INITIAL_MULT_COUNT;
2318 if (drive->mult_req > id->max_multsect)
2319 drive->mult_req = id->max_multsect;
2320 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2321 drive->special.b.set_multmode = 1;
2322 }
2323 if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2324 if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2325 printk(", DMA");
2326 }
2327 printk("\n");
2328 }
2329
2330 /*
2331 * Delay for *at least* 10ms. As we don't know how much time is left
2332 * until the next tick occurs, we wait an extra tick to be safe.
2333 * This is used only during the probing/polling for drives at boot time.
2334 */
2335 static void delay_10ms (void)
/* */
2336 {
2337 unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2338 while (timer > jiffies);
2339 }
2340
2341 /*
2342 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2343 * and waits for a response. It also monitors irqs while this is
2344 * happening, in hope of automatically determining which one is
2345 * being used by the interface.
2346 *
2347 * Returns: 0 device was identified
2348 * 1 device timed-out (no response to identify request)
2349 * 2 device aborted the command (refused to identify itself)
2350 */
2351 static int try_to_identify (ide_drive_t *drive, byte cmd)
/* */
2352 {
2353 int hd_status, rc;
2354 unsigned long timeout;
2355 int irqs = 0;
2356
2357 if (!HWIF(drive)->irq) { /* already got an IRQ? */
2358 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2359 irqs = probe_irq_on(); /* start monitoring irqs */
2360 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2361 }
2362
2363 delay_10ms(); /* take a deep breath */
2364 if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2365 printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2366 hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2367 } else
2368 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2369
2370 #if CONFIG_BLK_DEV_PROMISE
2371 if (IS_PROMISE_DRIVE) {
2372 if(promise_cmd(drive,PROMISE_IDENTIFY))
2373 return 1;
2374 } else
2375 #endif /* CONFIG_BLK_DEV_PROMISE */
2376 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2377 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2378 timeout += jiffies;
2379 do {
2380 if (jiffies > timeout) {
2381 if (!HWIF(drive)->irq)
2382 (void) probe_irq_off(irqs);
2383 return 1; /* drive timed-out */
2384 }
2385 delay_10ms(); /* give drive a breather */
2386 } while (IN_BYTE(hd_status) & BUSY_STAT);
2387
2388 delay_10ms(); /* wait for IRQ and DRQ_STAT */
2389 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2390 unsigned long flags;
2391 save_flags(flags);
2392 cli(); /* some systems need this */
2393 do_identify(drive, cmd); /* drive returned ID */
2394 if (drive->present && drive->media != ide_tape) {
2395 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2396 if (tuneproc != NULL && drive->autotune == 1)
2397 tuneproc(drive, 255); /* auto-tune PIO mode */
2398 }
2399 rc = 0; /* drive responded with ID */
2400 (void) GET_STAT(); /* clear drive IRQ */
2401 restore_flags(flags);
2402 } else
2403 rc = 2; /* drive refused ID */
2404 if (!HWIF(drive)->irq) {
2405 irqs = probe_irq_off(irqs); /* get irq number */
2406 if (irqs > 0)
2407 HWIF(drive)->irq = irqs;
2408 else /* Mmmm.. multiple IRQs */
2409 printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2410 }
2411 return rc;
2412 }
2413
2414 /*
2415 * do_probe() has the difficult job of finding a drive if it exists,
2416 * without getting hung up if it doesn't exist, without trampling on
2417 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2418 *
2419 * If a drive is "known" to exist (from CMOS or kernel parameters),
2420 * but does not respond right away, the probe will "hang in there"
2421 * for the maximum wait time (about 30 seconds), otherwise it will
2422 * exit much more quickly.
2423 *
2424 * Returns: 0 device was identified
2425 * 1 device timed-out (no response to identify request)
2426 * 2 device aborted the command (refused to identify itself)
2427 * 3 bad status from device (possible for ATAPI drives)
2428 * 4 probe was not attempted because failure was obvious
2429 */
2430 static int do_probe (ide_drive_t *drive, byte cmd)
/* */
2431 {
2432 int rc;
2433 ide_hwif_t *hwif;
2434 #ifdef CONFIG_BLK_DEV_IDEATAPI
2435 if (drive->present) { /* avoid waiting for inappropriate probes */
2436 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2437 return 4;
2438 }
2439 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2440 #ifdef DEBUG
2441 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2442 drive->name, drive->present, drive->media,
2443 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2444 #endif
2445 hwif = HWIF(drive);
2446 SELECT_DRIVE(hwif,drive);
2447 OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2448 delay_10ms(); /* wait for BUSY_STAT */
2449 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2450 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2451 return 3; /* no i/f present: avoid killing ethernet cards */
2452 }
2453
2454 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2455 || drive->present || cmd == WIN_PIDENTIFY)
2456 {
2457 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2458 rc = try_to_identify(drive,cmd); /* failed: try again */
2459 if (rc == 1)
2460 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2461 (void) GET_STAT(); /* ensure drive irq is clear */
2462 } else {
2463 rc = 3; /* not present or maybe ATAPI */
2464 }
2465 if (drive->select.b.unit != 0) {
2466 OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2467 delay_10ms();
2468 (void) GET_STAT(); /* ensure drive irq is clear */
2469 }
2470 return rc;
2471 }
2472
2473 /*
2474 * probe_for_drive() tests for existence of a given drive using do_probe().
2475 *
2476 * Returns: 0 no device was found
2477 * 1 device was found (note: drive->present might still be 0)
2478 */
2479 static inline byte probe_for_drive (ide_drive_t *drive)
/* */
2480 {
2481 if (drive->noprobe) /* skip probing? */
2482 return drive->present;
2483 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2484 #ifdef CONFIG_BLK_DEV_IDEATAPI
2485 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2486 #endif /* CONFIG_BLK_DEV_IDEATAPI */
2487 }
2488 if (!drive->present)
2489 return 0; /* drive not found */
2490 if (drive->id == NULL) { /* identification failed? */
2491 if (drive->media == ide_disk) {
2492 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2493 drive->name, drive->cyl, drive->head, drive->sect);
2494 }
2495 #ifdef CONFIG_BLK_DEV_IDECD
2496 else if (drive->media == ide_cdrom) {
2497 printk("%s: ATAPI cdrom (?)\n", drive->name);
2498 }
2499 #endif /* CONFIG_BLK_DEV_IDECD */
2500 else {
2501 drive->present = 0; /* nuke it */
2502 }
2503 }
2504 return 1; /* drive was found */
2505 }
2506
2507 /*
2508 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2509 * controller that is BIOS compatible with ST-506, and thus showing up in our
2510 * BIOS table, but not register compatible, and therefore not present in CMOS.
2511 *
2512 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2513 * drives in the system -- the ones reflected as drive 1 or 2. The first
2514 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2515 * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2516 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2517 * means we have an AT controller hard disk for that drive.
2518 *
2519 * Of course, there is no guarantee that either drive is actually on the
2520 * "primary" IDE interface, but we don't bother trying to sort that out here.
2521 * If a drive is not actually on the primary interface, then these parameters
2522 * will be ignored. This results in the user having to supply the logical
2523 * drive geometry as a boot parameter for each drive not on the primary i/f.
2524 *
2525 * The only "perfect" way to handle this would be to modify the setup.[cS] code
2526 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2527 * for us during initialization. I have the necessary docs -- any takers? -ml
2528 */
2529 static void probe_cmos_for_drives (ide_hwif_t *hwif)
/* */
2530 {
2531 #ifdef __i386__
2532 extern struct drive_info_struct drive_info;
2533 byte cmos_disks, *BIOS = (byte *) &drive_info;
2534 int unit;
2535
2536 #ifdef CONFIG_BLK_DEV_PROMISE
2537 if (hwif->is_promise2)
2538 return;
2539 #endif /* CONFIG_BLK_DEV_PROMISE */
2540 outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2541 cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2542 /* Extract drive geometry from CMOS+BIOS if not already setup */
2543 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2544 ide_drive_t *drive = &hwif->drives[unit];
2545 if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2546 drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2547 drive->head = drive->bios_head = *(BIOS+2);
2548 drive->sect = drive->bios_sect = *(BIOS+14);
2549 drive->ctl = *(BIOS+8);
2550 drive->present = 1;
2551 }
2552 BIOS += 16;
2553 }
2554 #endif
2555 }
2556
2557 /*
2558 * This routine only knows how to look for drive units 0 and 1
2559 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2560 */
2561 static void probe_hwif (ide_hwif_t *hwif)
/* */
2562 {
2563 unsigned int unit;
2564
2565 if (hwif->noprobe)
2566 return;
2567 if (hwif->io_base == HD_DATA)
2568 probe_cmos_for_drives (hwif);
2569 #if CONFIG_BLK_DEV_PROMISE
2570 if (!hwif->is_promise2 &&
2571 (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2572 #else
2573 if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2574 #endif /* CONFIG_BLK_DEV_PROMISE */
2575 int msgout = 0;
2576 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2577 ide_drive_t *drive = &hwif->drives[unit];
2578 if (drive->present) {
2579 drive->present = 0;
2580 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2581 msgout = 1;
2582 }
2583 }
2584 if (!msgout)
2585 printk("%s: ports already in use, skipping probe\n", hwif->name);
2586 } else {
2587 unsigned long flags;
2588 save_flags(flags);
2589
2590 sti(); /* needed for jiffies and irq probing */
2591 /*
2592 * Second drive should only exist if first drive was found,
2593 * but a lot of cdrom drives are configured as single slaves.
2594 */
2595 for (unit = 0; unit < MAX_DRIVES; ++unit) {
2596 ide_drive_t *drive = &hwif->drives[unit];
2597 (void) probe_for_drive (drive);
2598 if (drive->present && drive->media == ide_disk) {
2599 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2600 printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2601 drive->name, drive->head);
2602 drive->present = 0;
2603 }
2604 }
2605 if (drive->present && !hwif->present) {
2606 hwif->present = 1;
2607 request_region(hwif->io_base, 8, hwif->name);
2608 request_region(hwif->ctl_port, 1, hwif->name);
2609 }
2610 }
2611 restore_flags(flags);
2612 }
2613 }
2614
2615 /*
2616 * stridx() returns the offset of c within s,
2617 * or -1 if c is '\0' or not found within s.
2618 */
2619 static int stridx (const char *s, char c)
/* */
2620 {
2621 char *i = strchr(s, c);
2622 return (i && c) ? i - s : -1;
2623 }
2624
2625 /*
2626 * match_parm() does parsing for ide_setup():
2627 *
2628 * 1. the first char of s must be '='.
2629 * 2. if the remainder matches one of the supplied keywords,
2630 * the index (1 based) of the keyword is negated and returned.
2631 * 3. if the remainder is a series of no more than max_vals numbers
2632 * separated by commas, the numbers are saved in vals[] and a
2633 * count of how many were saved is returned. Base10 is assumed,
2634 * and base16 is allowed when prefixed with "0x".
2635 * 4. otherwise, zero is returned.
2636 */
2637 static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
/* */
2638 {
2639 static const char *decimal = "0123456789";
2640 static const char *hex = "0123456789abcdef";
2641 int i, n;
2642
2643 if (*s++ == '=') {
2644 /*
2645 * Try matching against the supplied keywords,
2646 * and return -(index+1) if we match one
2647 */
2648 for (i = 0; *keywords != NULL; ++i) {
2649 if (!strcmp(s, *keywords++))
2650 return -(i+1);
2651 }
2652 /*
2653 * Look for a series of no more than "max_vals"
2654 * numeric values separated by commas, in base10,
2655 * or base16 when prefixed with "0x".
2656 * Return a count of how many were found.
2657 */
2658 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2659 vals[n] = i;
2660 while ((i = stridx(decimal, *++s)) >= 0)
2661 vals[n] = (vals[n] * 10) + i;
2662 if (*s == 'x' && !vals[n]) {
2663 while ((i = stridx(hex, *++s)) >= 0)
2664 vals[n] = (vals[n] * 0x10) + i;
2665 }
2666 if (++n == max_vals)
2667 break;
2668 if (*s == ',')
2669 ++s;
2670 }
2671 if (!*s)
2672 return n;
2673 }
2674 return 0; /* zero = nothing matched */
2675 }
2676
2677 /*
2678 * ide_setup() gets called VERY EARLY during initialization,
2679 * to handle kernel "command line" strings beginning with "hdx="
2680 * or "ide". Here is the complete set currently supported:
2681 *
2682 * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2683 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2684 *
2685 * "hdx=noprobe" : drive may be present, but do not probe for it
2686 * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2687 * "hdx=cdrom" : drive is present, and is a cdrom drive
2688 * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2689 * "hdx=autotune" : driver will attempt to tune interface speed
2690 * to the fastest PIO mode supported,
2691 * if possible for this drive only.
2692 * Not fully supported by all chipset types,
2693 * and quite likely to cause trouble with
2694 * older/odd IDE drives.
2695 *
2696 * "idex=noprobe" : do not attempt to access/use this interface
2697 * "idex=base" : probe for an interface at the addr specified,
2698 * where "base" is usually 0x1f0 or 0x170
2699 * and "ctl" is assumed to be "base"+0x206
2700 * "idex=base,ctl" : specify both base and ctl
2701 * "idex=base,ctl,irq" : specify base, ctl, and irq number
2702 * "idex=autotune" : driver will attempt to tune interface speed
2703 * to the fastest PIO mode supported,
2704 * for all drives on this interface.
2705 * Not fully supported by all chipset types,
2706 * and quite likely to cause trouble with
2707 * older/odd IDE drives.
2708 * "idex=noautotune" : driver will NOT attempt to tune interface speed
2709 * This is the default for most chipsets,
2710 * except the cmd640.
2711 * "idex=serialize" : do not overlap operations on idex and ide(x^1)
2712 *
2713 * The following are valid ONLY on ide0,
2714 * and the defaults for the base,ctl ports must not be altered.
2715 *
2716 * "ide0=dtc2278" : probe/support DTC2278 interface
2717 * "ide0=ht6560b" : probe/support HT6560B interface
2718 * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2719 * (not for PCI -- automatically detected)
2720 * "ide0=qd6580" : probe/support qd6580 interface
2721 * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2722 * "ide0=umc8672" : probe/support umc8672 chipsets
2723 */
2724 void ide_setup (char *s)
/* */
2725 {
2726 int i, vals[3];
2727 ide_hwif_t *hwif;
2728 ide_drive_t *drive;
2729 unsigned int hw, unit;
2730 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2731 const char max_hwif = '0' + (MAX_HWIFS - 1);
2732
2733 printk("ide_setup: %s", s);
2734 init_ide_data ();
2735
2736 /*
2737 * Look for drive options: "hdx="
2738 */
2739 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2740 const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2741 "autotune", "noautotune", NULL};
2742 unit = s[2] - 'a';
2743 hw = unit / MAX_DRIVES;
2744 unit = unit % MAX_DRIVES;
2745 hwif = &ide_hwifs[hw];
2746 drive = &hwif->drives[unit];
2747 switch (match_parm(&s[3], hd_words, vals, 3)) {
2748 case -1: /* "noprobe" */
2749 drive->noprobe = 1;
2750 goto done;
2751 case -2: /* "nowerr" */
2752 drive->bad_wstat = BAD_R_STAT;
2753 hwif->noprobe = 0;
2754 goto done;
2755 case -3: /* "cdrom" */
2756 drive->present = 1;
2757 drive->media = ide_cdrom;
2758 hwif->noprobe = 0;
2759 goto done;
2760 case -4: /* "serialize" */
2761 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
2762 goto do_serialize;
2763 case -5: /* "autotune" */
2764 drive->autotune = 1;
2765 goto done;
2766 case -6: /* "noautotune" */
2767 drive->autotune = 2;
2768 goto done;
2769 case 3: /* cyl,head,sect */
2770 drive->media = ide_disk;
2771 drive->cyl = drive->bios_cyl = vals[0];
2772 drive->head = drive->bios_head = vals[1];
2773 drive->sect = drive->bios_sect = vals[2];
2774 drive->present = 1;
2775 drive->forced_geom = 1;
2776 hwif->noprobe = 0;
2777 goto done;
2778 default:
2779 goto bad_option;
2780 }
2781 }
2782 /*
2783 * Look for interface options: "idex="
2784 */
2785 if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2786 /*
2787 * Be VERY CAREFUL changing this: note hardcoded indexes below
2788 */
2789 const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2790 "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
2791 hw = s[3] - '0';
2792 hwif = &ide_hwifs[hw];
2793 i = match_parm(&s[4], ide_words, vals, 3);
2794
2795 /*
2796 * Cryptic check to ensure chipset not already set for hwif:
2797 */
2798 if (i != -1 && i != -2) {
2799 if (hwif->chipset != ide_unknown)
2800 goto bad_option;
2801 if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2802 goto bad_option;
2803 }
2804 /*
2805 * Interface keywords work only for ide0:
2806 */
2807 if (i <= -6 && hw != 0)
2808 goto bad_hwif;
2809
2810 switch (i) {
2811 #ifdef CONFIG_BLK_DEV_PROMISE
2812 case -11: /* "dc4030" */
2813 {
2814 setup_dc4030(hwif);
2815 goto done;
2816 }
2817 #endif /* CONFIG_BLK_DEV_PROMISE */
2818 #ifdef CONFIG_BLK_DEV_ALI14XX
2819 case -10: /* "ali14xx" */
2820 {
2821 extern void init_ali14xx (void);
2822 init_ali14xx();
2823 goto done;
2824 }
2825 #endif /* CONFIG_BLK_DEV_ALI14XX */
2826 #ifdef CONFIG_BLK_DEV_UMC8672
2827 case -9: /* "umc8672" */
2828 {
2829 extern void init_umc8672 (void);
2830 init_umc8672();
2831 goto done;
2832 }
2833 #endif /* CONFIG_BLK_DEV_UMC8672 */
2834 #ifdef CONFIG_BLK_DEV_DTC2278
2835 case -8: /* "dtc2278" */
2836 {
2837 extern void init_dtc2278 (void);
2838 init_dtc2278();
2839 goto done;
2840 }
2841 #endif /* CONFIG_BLK_DEV_DTC2278 */
2842 #ifdef CONFIG_BLK_DEV_CMD640
2843 case -7: /* "cmd640_vlb" */
2844 {
2845 extern int cmd640_vlb; /* flag for cmd640.c */
2846 cmd640_vlb = 1;
2847 goto done;
2848 }
2849 #endif /* CONFIG_BLK_DEV_CMD640 */
2850 #ifdef CONFIG_BLK_DEV_HT6560B
2851 case -6: /* "ht6560b" */
2852 {
2853 extern void init_ht6560b (void);
2854 init_ht6560b();
2855 goto done;
2856 }
2857 #endif /* CONFIG_BLK_DEV_HT6560B */
2858 #if CONFIG_BLK_DEV_QD6580
2859 case -5: /* "qd6580" (no secondary i/f) */
2860 {
2861 extern void init_qd6580 (void);
2862 init_qd6580();
2863 goto done;
2864 }
2865 #endif /* CONFIG_BLK_DEV_QD6580 */
2866 case -4: /* "noautotune" */
2867 hwif->drives[0].autotune = 2;
2868 hwif->drives[1].autotune = 2;
2869 goto done;
2870 case -3: /* "autotune" */
2871 hwif->drives[0].autotune = 1;
2872 hwif->drives[1].autotune = 1;
2873 goto done;
2874 case -2: /* "serialize" */
2875 do_serialize:
2876 ide_hwifs[hw].serialized = 1; /* serialize */
2877 ide_hwifs[hw^1].serialized = 1; /* with mate */
2878 goto done;
2879
2880 case -1: /* "noprobe" */
2881 hwif->noprobe = 1;
2882 goto done;
2883
2884 case 1: /* base */
2885 vals[1] = vals[0] + 0x206; /* default ctl */
2886 case 2: /* base,ctl */
2887 vals[2] = 0; /* default irq = probe for it */
2888 case 3: /* base,ctl,irq */
2889 hwif->io_base = vals[0];
2890 hwif->ctl_port = vals[1];
2891 hwif->irq = vals[2];
2892 hwif->noprobe = 0;
2893 hwif->chipset = ide_generic;
2894 goto done;
2895
2896 case 0: goto bad_option;
2897 default:
2898 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2899 return;
2900 }
2901 }
2902 bad_option:
2903 printk(" -- BAD OPTION\n");
2904 return;
2905 bad_hwif:
2906 printk("-- NOT SUPPORTED ON ide%d", hw);
2907 done:
2908 printk("\n");
2909 }
2910
2911 /*
2912 * This routine is called from the partition-table code in genhd.c
2913 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2914 *
2915 * The second parameter, "xparm", determines exactly how the translation
2916 * will be handled:
2917 * 0 = convert to CHS with fewer than 1024 cyls
2918 * using the same method as Ontrack DiskManager.
2919 * 1 = same as "0", plus offset everything by 63 sectors.
2920 * -1 = similar to "0", plus redirect sector 0 to sector 1.
2921 * >1 = convert to a CHS geometry with "xparm" heads.
2922 *
2923 * Returns 0 if the translation was not possible, if the device was not
2924 * an IDE disk drive, or if a geometry was "forced" on the commandline.
2925 * Returns 1 if the geometry translation was successful.
2926 */
2927 int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
/* */
2928 {
2929 ide_drive_t *drive;
2930 static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2931 const byte *heads = head_vals;
2932 unsigned long tracks;
2933
2934 if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2935 return 0;
2936
2937 if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2938 return 0; /* we already have a translation */
2939
2940 printk("%s ", msg);
2941
2942 if (drive->id) {
2943 drive->cyl = drive->id->cyls;
2944 drive->head = drive->id->heads;
2945 drive->sect = drive->id->sectors;
2946 }
2947 drive->bios_cyl = drive->cyl;
2948 drive->bios_head = drive->head;
2949 drive->bios_sect = drive->sect;
2950 drive->special.b.set_geometry = 1;
2951
2952 tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2953 drive->bios_sect = 63;
2954 if (xparm > 1) {
2955 drive->bios_head = xparm;
2956 drive->bios_cyl = tracks / drive->bios_head;
2957 } else {
2958 while (drive->bios_cyl >= 1024) {
2959 drive->bios_head = *heads;
2960 drive->bios_cyl = tracks / drive->bios_head;
2961 if (0 == *++heads)
2962 break;
2963 }
2964 #if FAKE_FDISK_FOR_EZDRIVE
2965 if (xparm == -1) {
2966 drive->remap_0_to_1 = 1;
2967 msg = "0->1";
2968 } else
2969 #endif /* FAKE_FDISK_FOR_EZDRIVE */
2970 if (xparm == 1) {
2971 drive->sect0 = 63;
2972 drive->bios_cyl = (tracks - 1) / drive->bios_head;
2973 msg = "+63";
2974 }
2975 printk("[remap %s] ", msg);
2976 }
2977 drive->part[0].nr_sects = current_capacity(drive);
2978 printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2979 return 1;
2980 }
2981
2982
2983 /*
2984 * This routine sets up the irq for an ide interface, and creates a new
2985 * hwgroup for the irq/hwif if none was previously assigned.
2986 *
2987 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2988 * interrupts completely disabled. This can be bad for interrupt latency,
2989 * but anything else has led to problems on some machines. We re-enable
2990 * interrupts as much as we can safely do in most places.
2991 */
2992 static int init_irq (ide_hwif_t *hwif)
/* */
2993 {
2994 unsigned long flags;
2995 ide_hwgroup_t *hwgroup = hwif->hwgroup;
2996 ide_hwif_t *mate_hwif;
2997 unsigned int index, mate_irq = hwif->irq;
2998
2999 save_flags(flags);
3000 cli();
3001
3002 /*
3003 * Handle serialization, regardless of init sequence
3004 */
3005 mate_hwif = &ide_hwifs[hwif->index ^ 1];
3006 if (hwif->serialized && mate_hwif->present)
3007 mate_irq = mate_hwif->irq;
3008
3009 /*
3010 * Group up with any other hwifs that share our irq(s)
3011 */
3012 for (index = 0; index < MAX_HWIFS; index++) {
3013 if (index != hwif->index) {
3014 ide_hwif_t *g = &ide_hwifs[index];
3015 if (g->irq == hwif->irq || g->irq == mate_irq) {
3016 if (hwgroup && !g->hwgroup)
3017 g->hwgroup = hwgroup;
3018 else if (!hwgroup)
3019 hwgroup = g->hwgroup;
3020 }
3021 }
3022 }
3023
3024 /*
3025 * If we are still without a hwgroup, then form a new one
3026 */
3027 if (hwgroup == NULL) {
3028 hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
3029 hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3030 hwgroup->rq = NULL;
3031 hwgroup->handler = NULL;
3032 if (hwif->drives[0].present)
3033 hwgroup->drive = &hwif->drives[0];
3034 else
3035 hwgroup->drive = &hwif->drives[1];
3036 hwgroup->poll_timeout = 0;
3037 init_timer(&hwgroup->timer);
3038 hwgroup->timer.function = &timer_expiry;
3039 hwgroup->timer.data = (unsigned long) hwgroup;
3040 }
3041
3042 /*
3043 * Allocate the irq, if not already obtained for another hwif
3044 */
3045 if (!hwif->got_irq) {
3046 if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name, hwgroup)) {
3047 restore_flags(flags);
3048 return 1;
3049 }
3050 for (index = 0; index < MAX_HWIFS; index++) {
3051 ide_hwif_t *g = &ide_hwifs[index];
3052 if (g->irq == hwif->irq)
3053 g->got_irq = 1;
3054 }
3055 }
3056
3057 /*
3058 * Everything is okay, so link us into the hwgroup
3059 */
3060 hwif->hwgroup = hwgroup;
3061 hwif->next = hwgroup->hwif->next;
3062 hwgroup->hwif->next = hwif;
3063
3064 restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3065
3066 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3067 hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3068 if (hwgroup->hwif != hwif)
3069 printk(" (serialized with %s)", hwgroup->hwif->name);
3070 printk("\n");
3071 return 0;
3072 }
3073
3074 static struct file_operations ide_fops = {
3075 NULL, /* lseek - default */
3076 block_read, /* read - general block-dev read */
3077 block_write, /* write - general block-dev write */
3078 NULL, /* readdir - bad */
3079 NULL, /* select */
3080 ide_ioctl, /* ioctl */
3081 NULL, /* mmap */
3082 ide_open, /* open */
3083 ide_release, /* release */
3084 block_fsync /* fsync */
3085 ,NULL, /* fasync */
3086 ide_check_media_change, /* check_media_change */
3087 revalidate_disk /* revalidate */
3088 };
3089
3090 #ifdef CONFIG_PCI
3091 #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3092
3093 typedef void (ide_pci_init_proc_t)(byte, byte);
3094
3095 /*
3096 * ide_probe_pci() scans PCI for a specific vendor/device function,
3097 * and invokes the supplied init routine for each instance detected.
3098 */
3099 static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
/* */
3100 {
3101 unsigned long flags;
3102 unsigned index;
3103 byte fn, bus;
3104
3105 save_flags(flags);
3106 cli();
3107 for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3108 init (bus, fn + func_adj);
3109 }
3110 restore_flags(flags);
3111 }
3112
3113 #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3114 #endif /* CONFIG_PCI */
3115
3116 /*
3117 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3118 *
3119 * This routine should ideally be using pcibios_find_class() to find
3120 * all IDE interfaces, but that function causes some systems to "go weird".
3121 */
3122 static void probe_for_hwifs (void)
/* */
3123 {
3124 #ifdef CONFIG_PCI
3125 /*
3126 * Find/initialize PCI IDE interfaces
3127 */
3128 if (pcibios_present()) {
3129 #ifdef CONFIG_BLK_DEV_RZ1000
3130 ide_pci_init_proc_t init_rz1000;
3131 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3132 ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3133 #endif /* CONFIG_BLK_DEV_RZ1000 */
3134 #ifdef CONFIG_BLK_DEV_TRITON
3135 /*
3136 * Apparently the BIOS32 services on Intel motherboards are
3137 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3138 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3139 * and then add 1.
3140 */
3141 ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3142 #endif /* CONFIG_BLK_DEV_TRITON */
3143 }
3144 #endif /* CONFIG_PCI */
3145 #ifdef CONFIG_BLK_DEV_CMD640
3146 {
3147 extern void ide_probe_for_cmd640x (void);
3148 ide_probe_for_cmd640x();
3149 }
3150 #endif
3151 #ifdef CONFIG_BLK_DEV_PROMISE
3152 init_dc4030();
3153 #endif
3154 }
3155
3156 static int hwif_init (int h)
/* */
3157 {
3158 ide_hwif_t *hwif = &ide_hwifs[h];
3159 void (*rfn)(void);
3160
3161 if (!hwif->present)
3162 return 0;
3163 if (!hwif->irq) {
3164 if (!(hwif->irq = default_irqs[h])) {
3165 printk("%s: DISABLED, NO IRQ\n", hwif->name);
3166 return (hwif->present = 0);
3167 }
3168 }
3169 #ifdef CONFIG_BLK_DEV_HD
3170 if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3171 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3172 return (hwif->present = 0);
3173 }
3174 #endif /* CONFIG_BLK_DEV_HD */
3175
3176 hwif->present = 0; /* we set it back to 1 if all is ok below */
3177 switch (hwif->major) {
3178 case IDE0_MAJOR: rfn = &do_ide0_request; break;
3179 #if MAX_HWIFS > 1
3180 case IDE1_MAJOR: rfn = &do_ide1_request; break;
3181 #endif
3182 #if MAX_HWIFS > 2
3183 case IDE2_MAJOR: rfn = &do_ide2_request; break;
3184 #endif
3185 #if MAX_HWIFS > 3
3186 case IDE3_MAJOR: rfn = &do_ide3_request; break;
3187 #endif
3188 default:
3189 printk("%s: request_fn NOT DEFINED\n", hwif->name);
3190 return (hwif->present = 0);
3191 }
3192 if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3193 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3194 } else if (init_irq (hwif)) {
3195 printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3196 (void) unregister_blkdev (hwif->major, hwif->name);
3197 } else {
3198 init_gendisk(hwif);
3199 blk_dev[hwif->major].request_fn = rfn;
3200 read_ahead[hwif->major] = 8; /* (4kB) */
3201 hwif->present = 1; /* success */
3202 }
3203 return hwif->present;
3204 }
3205
3206 /*
3207 * This is gets invoked once during initialization, to set *everything* up
3208 */
3209 int ide_init (void)
/* */
3210 {
3211 int index;
3212
3213 init_ide_data ();
3214 /*
3215 * Probe for special "known" interface chipsets
3216 */
3217 probe_for_hwifs ();
3218
3219 /*
3220 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3221 */
3222 for (index = 0; index < MAX_HWIFS; ++index)
3223 probe_hwif (&ide_hwifs[index]);
3224 for (index = 0; index < MAX_HWIFS; ++index)
3225 hwif_init (index);
3226
3227 #ifdef CONFIG_BLK_DEV_IDETAPE
3228 idetape_register_chrdev(); /* Register character device interface to the ide tape */
3229 #endif /* CONFIG_BLK_DEV_IDETAPE */
3230
3231 return 0;
3232 }
3233
3234 #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3235 int ide_register(int io_base, int ctl_port, int irq)
/* */
3236 {
3237 int index, i, rc = -1;
3238 ide_hwif_t *hwif;
3239 unsigned long flags;
3240
3241 save_flags(flags);
3242 cli();
3243 for (index = 0; index < MAX_HWIFS; ++index) {
3244 hwif = &ide_hwifs[index];
3245 if (hwif->present) {
3246 if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3247 break; /* this ide port already exists */
3248 } else {
3249 hwif->io_base = io_base;
3250 hwif->ctl_port = ctl_port;
3251 hwif->irq = irq;
3252 hwif->noprobe = 0;
3253 probe_hwif(hwif);
3254 if (!hwif_init(index))
3255 break;
3256 for (i = 0; i < hwif->gd->nr_real; i++)
3257 revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3258 rc = index;
3259 break;
3260 }
3261 }
3262 restore_flags(flags);
3263 return rc;
3264 }
3265
3266 void ide_unregister (unsigned int index)
/* ![[last]](../icons/n_last.png)
*/
3267 {
3268 struct gendisk *gd, **gdp;
3269 ide_hwif_t *hwif, *g;
3270 ide_hwgroup_t *hwgroup;
3271 int irq_count = 0;
3272 unsigned long flags;
3273
3274 if (index >= MAX_HWIFS)
3275 return;
3276 save_flags(flags);
3277 cli();
3278 hwif = &ide_hwifs[index];
3279 if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3280 restore_flags(flags);
3281 return;
3282 }
3283 hwif->present = 0;
3284 hwgroup = hwif->hwgroup;
3285
3286 /*
3287 * free the irq if we were the only hwif using it
3288 */
3289 g = hwgroup->hwif;
3290 do {
3291 if (g->irq == hwif->irq)
3292 ++irq_count;
3293 g = g->next;
3294 } while (g != hwgroup->hwif);
3295 if (irq_count == 1)
3296 free_irq(hwif->irq, hwgroup);
3297
3298 /*
3299 * Note that we only release the standard ports,
3300 * and do not even try to handle any extra ports
3301 * allocated for weird IDE interface chipsets.
3302 */
3303 release_region(hwif->io_base, 8);
3304 release_region(hwif->ctl_port, 1);
3305
3306 /*
3307 * Remove us from the hwgroup, and free
3308 * the hwgroup if we were the only member
3309 */
3310 while (hwgroup->hwif->next != hwif)
3311 hwgroup->hwif = hwgroup->hwif->next;
3312 hwgroup->hwif->next = hwif->next;
3313 if (hwgroup->hwif == hwif)
3314 hwgroup->hwif = hwif->next;
3315 if (hwgroup->next_hwif == hwif)
3316 hwgroup->next_hwif = hwif->next;
3317 if (hwgroup->hwif == hwif)
3318 kfree(hwgroup);
3319
3320 /*
3321 * Remove us from the kernel's knowledge
3322 */
3323 unregister_blkdev(hwif->major, hwif->name);
3324 kfree(blksize_size[hwif->major]);
3325 blk_dev[hwif->major].request_fn = NULL;
3326 blksize_size[hwif->major] = NULL;
3327 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
3328 if (*gdp == hwif->gd)
3329 break;
3330 if (*gdp == NULL)
3331 printk("gd not in disk chain!\n");
3332 else {
3333 gd = *gdp; *gdp = gd->next;
3334 kfree(gd->sizes);
3335 kfree(gd->part);
3336 kfree(gd);
3337 }
3338 init_hwif_data (index); /* restore hwif data to pristine status */
3339 restore_flags(flags);
3340 }
3341 #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/