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