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The LDT fixes in particular fix some potentially random strange behaviour.
[davej-history.git] / drivers / ide / ide-probe.c
blobdecbc9f8d5294f03c738572ac3f2f77f83b477b3
1 /*
2 * linux/drivers/ide/ide-probe.c Version 1.06 June 9, 2000
3 *
4 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
5 */
6
7 /*
8 * Mostly written by Mark Lord <mlord@pobox.com>
9 * and Gadi Oxman <gadio@netvision.net.il>
10 * and Andre Hedrick <andre@linux-ide.org>
11 *
12 * See linux/MAINTAINERS for address of current maintainer.
13 *
14 * This is the IDE probe module, as evolved from hd.c and ide.c.
15 *
16 * Version 1.00 move drive probing code from ide.c to ide-probe.c
17 * Version 1.01 fix compilation problem for m68k
18 * Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
19 * by Andrea Arcangeli
20 * Version 1.03 fix for (hwif->chipset == ide_4drives)
21 * Version 1.04 fixed buggy treatments of known flash memory cards
22 *
23 * Version 1.05 fix for (hwif->chipset == ide_pdc4030)
24 * added ide6/7/8/9
25 * allowed for secondary flash card to be detectable
26 * with new flag : drive->ata_flash : 1;
27 * Version 1.06 stream line request queue and prep for cascade project.
28 */
29
30 #undef REALLY_SLOW_IO /* most systems can safely undef this */
31
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/timer.h>
38 #include <linux/mm.h>
39 #include <linux/interrupt.h>
40 #include <linux/major.h>
41 #include <linux/errno.h>
42 #include <linux/genhd.h>
43 #include <linux/malloc.h>
44 #include <linux/delay.h>
45 #include <linux/ide.h>
46 #include <linux/spinlock.h>
47
48 #include <asm/byteorder.h>
49 #include <asm/irq.h>
50 #include <asm/uaccess.h>
51 #include <asm/io.h>
52
53 static inline void do_identify (ide_drive_t *drive, byte cmd)
54 {
55 int bswap = 1;
56 struct hd_driveid *id;
57
58 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_ATOMIC); /* called with interrupts disabled! */
59 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
60 ide__sti(); /* local CPU only */
61 ide_fix_driveid(id);
62
63 if (id->word156 == 0x4d42) {
64 printk("%s: drive->id->word156 == 0x%04x \n", drive->name, drive->id->word156);
65 }
66
67 if (!drive->forced_lun)
68 drive->last_lun = id->last_lun & 0x7;
69 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
70 /*
71 * EATA SCSI controllers do a hardware ATA emulation:
72 * Ignore them if there is a driver for them available.
73 */
74 if ((id->model[0] == 'P' && id->model[1] == 'M')
75 || (id->model[0] == 'S' && id->model[1] == 'K')) {
76 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
77 drive->present = 0;
78 return;
79 }
80 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
81
82 /*
83 * WIN_IDENTIFY returns little-endian info,
84 * WIN_PIDENTIFY *usually* returns little-endian info.
85 */
86 if (cmd == WIN_PIDENTIFY) {
87 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
88 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
89 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
90 bswap ^= 1; /* Vertos drives may still be weird */
91 }
92 ide_fixstring (id->model, sizeof(id->model), bswap);
93 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
94 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
95
96 if (strstr(id->model, "E X A B Y T E N E S T"))
97 return;
98
99 id->model[sizeof(id->model)-1] = '\0'; /* we depend on this a lot! */
100 printk("%s: %s, ", drive->name, id->model);
101 drive->present = 1;
102
103 /*
104 * Check for an ATAPI device
105 */
106 if (cmd == WIN_PIDENTIFY) {
107 byte type = (id->config >> 8) & 0x1f;
108 printk("ATAPI ");
109 #ifdef CONFIG_BLK_DEV_PDC4030
110 if (HWIF(drive)->channel == 1 && HWIF(drive)->chipset == ide_pdc4030) {
111 printk(" -- not supported on 2nd Promise port\n");
112 drive->present = 0;
113 return;
114 }
115 #endif /* CONFIG_BLK_DEV_PDC4030 */
116 switch (type) {
117 case ide_floppy:
118 if (!strstr(id->model, "CD-ROM")) {
119 if (!strstr(id->model, "oppy") && !strstr(id->model, "poyp") && !strstr(id->model, "ZIP"))
120 printk("cdrom or floppy?, assuming ");
121 if (drive->media != ide_cdrom) {
122 printk ("FLOPPY");
123 break;
124 }
125 }
126 type = ide_cdrom; /* Early cdrom models used zero */
127 case ide_cdrom:
128 drive->removable = 1;
129 #ifdef CONFIG_PPC
130 /* kludge for Apple PowerBook internal zip */
131 if (!strstr(id->model, "CD-ROM") && strstr(id->model, "ZIP")) {
132 printk ("FLOPPY");
133 type = ide_floppy;
134 break;
135 }
136 #endif
137 printk ("CDROM");
138 break;
139 case ide_tape:
140 printk ("TAPE");
141 break;
142 case ide_optical:
143 printk ("OPTICAL");
144 drive->removable = 1;
145 break;
146 default:
147 printk("UNKNOWN (type %d)", type);
148 break;
149 }
150 printk (" drive\n");
151 drive->media = type;
152 return;
153 }
154
155 /*
156 * Not an ATAPI device: looks like a "regular" hard disk
157 */
158 if (id->config & (1<<7))
159 drive->removable = 1;
160 /*
161 * Prevent long system lockup probing later for non-existant
162 * slave drive if the hwif is actually a flash memory card of some variety:
163 */
164 if (drive_is_flashcard(drive)) {
165 ide_drive_t *mate = &HWIF(drive)->drives[1^drive->select.b.unit];
166 if (!mate->ata_flash) {
167 mate->present = 0;
168 mate->noprobe = 1;
169 }
170 }
171 drive->media = ide_disk;
172 printk("ATA DISK drive\n");
173 QUIRK_LIST(HWIF(drive),drive);
174 return;
175 }
176
177 /*
178 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
179 * and waits for a response. It also monitors irqs while this is
180 * happening, in hope of automatically determining which one is
181 * being used by the interface.
182 *
183 * Returns: 0 device was identified
184 * 1 device timed-out (no response to identify request)
185 * 2 device aborted the command (refused to identify itself)
186 */
187 static int actual_try_to_identify (ide_drive_t *drive, byte cmd)
188 {
189 int rc;
190 ide_ioreg_t hd_status;
191 unsigned long timeout;
192 byte s, a;
193
194 if (IDE_CONTROL_REG) {
195 /* take a deep breath */
196 ide_delay_50ms();
197 a = IN_BYTE(IDE_ALTSTATUS_REG);
198 s = IN_BYTE(IDE_STATUS_REG);
199 if ((a ^ s) & ~INDEX_STAT) {
200 printk("%s: probing with STATUS(0x%02x) instead of ALTSTATUS(0x%02x)\n", drive->name, s, a);
201 hd_status = IDE_STATUS_REG; /* ancient Seagate drives, broken interfaces */
202 } else {
203 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
204 }
205 } else {
206 ide_delay_50ms();
207 hd_status = IDE_STATUS_REG;
208 }
209
210 /* set features register for atapi identify command to be sure of reply */
211 if ((cmd == WIN_PIDENTIFY))
212 OUT_BYTE(0,IDE_FEATURE_REG); /* disable dma & overlap */
213
214 #if CONFIG_BLK_DEV_PDC4030
215 if (HWIF(drive)->chipset == ide_pdc4030) {
216 /* DC4030 hosted drives need their own identify... */
217 extern int pdc4030_identify(ide_drive_t *);
218 if (pdc4030_identify(drive)) {
219 return 1;
220 }
221 } else
222 #endif /* CONFIG_BLK_DEV_PDC4030 */
223 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
224 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
225 timeout += jiffies;
226 do {
227 if (0 < (signed long)(jiffies - timeout)) {
228 return 1; /* drive timed-out */
229 }
230 ide_delay_50ms(); /* give drive a breather */
231 } while (IN_BYTE(hd_status) & BUSY_STAT);
232
233 ide_delay_50ms(); /* wait for IRQ and DRQ_STAT */
234 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
235 unsigned long flags;
236 __save_flags(flags); /* local CPU only */
237 __cli(); /* local CPU only; some systems need this */
238 do_identify(drive, cmd); /* drive returned ID */
239 rc = 0; /* drive responded with ID */
240 (void) GET_STAT(); /* clear drive IRQ */
241 __restore_flags(flags); /* local CPU only */
242 } else
243 rc = 2; /* drive refused ID */
244 return rc;
245 }
246
247 static int try_to_identify (ide_drive_t *drive, byte cmd)
248 {
249 int retval;
250 int autoprobe = 0;
251 unsigned long cookie = 0;
252
253 if (IDE_CONTROL_REG && !HWIF(drive)->irq) {
254 autoprobe = 1;
255 cookie = probe_irq_on();
256 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
257 }
258
259 retval = actual_try_to_identify(drive, cmd);
260
261 if (autoprobe) {
262 int irq;
263 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* mask device irq */
264 (void) GET_STAT(); /* clear drive IRQ */
265 udelay(5);
266 irq = probe_irq_off(cookie);
267 if (!HWIF(drive)->irq) {
268 if (irq > 0) {
269 HWIF(drive)->irq = irq;
270 } else { /* Mmmm.. multiple IRQs.. don't know which was ours */
271 printk("%s: IRQ probe failed (0x%lx)\n", drive->name, cookie);
272 #ifdef CONFIG_BLK_DEV_CMD640
273 #ifdef CMD640_DUMP_REGS
274 if (HWIF(drive)->chipset == ide_cmd640) {
275 printk("%s: Hmmm.. probably a driver problem.\n", drive->name);
276 CMD640_DUMP_REGS;
277 }
278 #endif /* CMD640_DUMP_REGS */
279 #endif /* CONFIG_BLK_DEV_CMD640 */
280 }
281 }
282 }
283 return retval;
284 }
285
286
287 /*
288 * do_probe() has the difficult job of finding a drive if it exists,
289 * without getting hung up if it doesn't exist, without trampling on
290 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
291 *
292 * If a drive is "known" to exist (from CMOS or kernel parameters),
293 * but does not respond right away, the probe will "hang in there"
294 * for the maximum wait time (about 30 seconds), otherwise it will
295 * exit much more quickly.
296 *
297 * Returns: 0 device was identified
298 * 1 device timed-out (no response to identify request)
299 * 2 device aborted the command (refused to identify itself)
300 * 3 bad status from device (possible for ATAPI drives)
301 * 4 probe was not attempted because failure was obvious
302 */
303 static int do_probe (ide_drive_t *drive, byte cmd)
304 {
305 int rc;
306 ide_hwif_t *hwif = HWIF(drive);
307 if (drive->present) { /* avoid waiting for inappropriate probes */
308 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
309 return 4;
310 }
311 #ifdef DEBUG
312 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
313 drive->name, drive->present, drive->media,
314 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
315 #endif
316 ide_delay_50ms(); /* needed for some systems (e.g. crw9624 as drive0 with disk as slave) */
317 SELECT_DRIVE(hwif,drive);
318 ide_delay_50ms();
319 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
320 if (drive->select.b.unit != 0) {
321 SELECT_DRIVE(hwif,&hwif->drives[0]); /* exit with drive0 selected */
322 ide_delay_50ms(); /* allow BUSY_STAT to assert & clear */
323 }
324 return 3; /* no i/f present: mmm.. this should be a 4 -ml */
325 }
326
327 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
328 || drive->present || cmd == WIN_PIDENTIFY)
329 {
330 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
331 rc = try_to_identify(drive,cmd); /* failed: try again */
332 if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune != 2) {
333 unsigned long timeout;
334 printk("%s: no response (status = 0x%02x), resetting drive\n", drive->name, GET_STAT());
335 ide_delay_50ms();
336 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
337 ide_delay_50ms();
338 OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
339 timeout = jiffies;
340 while ((GET_STAT() & BUSY_STAT) && time_before(jiffies, timeout + WAIT_WORSTCASE))
341 ide_delay_50ms();
342 rc = try_to_identify(drive, cmd);
343 }
344 if (rc == 1)
345 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
346 (void) GET_STAT(); /* ensure drive irq is clear */
347 } else {
348 rc = 3; /* not present or maybe ATAPI */
349 }
350 if (drive->select.b.unit != 0) {
351 SELECT_DRIVE(hwif,&hwif->drives[0]); /* exit with drive0 selected */
352 ide_delay_50ms();
353 (void) GET_STAT(); /* ensure drive irq is clear */
354 }
355 return rc;
356 }
357
358 /*
359 *
360 */
361 static void enable_nest (ide_drive_t *drive)
362 {
363 unsigned long timeout;
364
365 printk("%s: enabling %s -- ", HWIF(drive)->name, drive->id->model);
366 SELECT_DRIVE(HWIF(drive), drive);
367 ide_delay_50ms();
368 OUT_BYTE(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
369 timeout = jiffies + WAIT_WORSTCASE;
370 do {
371 if (jiffies > timeout) {
372 printk("failed (timeout)\n");
373 return;
374 }
375 ide_delay_50ms();
376 } while (GET_STAT() & BUSY_STAT);
377 ide_delay_50ms();
378 if (!OK_STAT(GET_STAT(), 0, BAD_STAT))
379 printk("failed (status = 0x%02x)\n", GET_STAT());
380 else
381 printk("success\n");
382 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
383 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
384 }
385 }
386
387 /*
388 * probe_for_drive() tests for existence of a given drive using do_probe().
389 *
390 * Returns: 0 no device was found
391 * 1 device was found (note: drive->present might still be 0)
392 */
393 static inline byte probe_for_drive (ide_drive_t *drive)
394 {
395 if (drive->noprobe) /* skip probing? */
396 return drive->present;
397 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
398 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
399 }
400 if (drive->id && strstr(drive->id->model, "E X A B Y T E N E S T"))
401 enable_nest(drive);
402 if (!drive->present)
403 return 0; /* drive not found */
404 if (drive->id == NULL) { /* identification failed? */
405 if (drive->media == ide_disk) {
406 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
407 drive->name, drive->cyl, drive->head, drive->sect);
408 } else if (drive->media == ide_cdrom) {
409 printk("%s: ATAPI cdrom (?)\n", drive->name);
410 } else {
411 drive->present = 0; /* nuke it */
412 }
413 }
414 return 1; /* drive was found */
415 }
416
417 /*
418 * Calculate the region that this interface occupies,
419 * handling interfaces where the registers may not be
420 * ordered sanely. We deal with the CONTROL register
421 * separately.
422 */
423 static int hwif_check_regions (ide_hwif_t *hwif)
424 {
425 int region_errors = 0;
426
427 hwif->straight8 = 0;
428 region_errors = ide_check_region(hwif->io_ports[IDE_DATA_OFFSET], 1);
429 region_errors += ide_check_region(hwif->io_ports[IDE_ERROR_OFFSET], 1);
430 region_errors += ide_check_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1);
431 region_errors += ide_check_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1);
432 region_errors += ide_check_region(hwif->io_ports[IDE_LCYL_OFFSET], 1);
433 region_errors += ide_check_region(hwif->io_ports[IDE_HCYL_OFFSET], 1);
434 region_errors += ide_check_region(hwif->io_ports[IDE_SELECT_OFFSET], 1);
435 region_errors += ide_check_region(hwif->io_ports[IDE_STATUS_OFFSET], 1);
436
437 if (hwif->io_ports[IDE_CONTROL_OFFSET])
438 region_errors += ide_check_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
439 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
440 if (hwif->io_ports[IDE_IRQ_OFFSET])
441 region_errors += ide_check_region(hwif->io_ports[IDE_IRQ_OFFSET], 1);
442 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
443 /*
444 * If any errors are return, we drop the hwif interface.
445 */
446 return(region_errors);
447 }
448
449 static void hwif_register (ide_hwif_t *hwif)
450 {
451 if (((unsigned long)hwif->io_ports[IDE_DATA_OFFSET] | 7) ==
452 ((unsigned long)hwif->io_ports[IDE_STATUS_OFFSET])) {
453 ide_request_region(hwif->io_ports[IDE_DATA_OFFSET], 8, hwif->name);
454 hwif->straight8 = 1;
455 goto jump_straight8;
456 }
457
458 if (hwif->io_ports[IDE_DATA_OFFSET])
459 ide_request_region(hwif->io_ports[IDE_DATA_OFFSET], 1, hwif->name);
460 if (hwif->io_ports[IDE_ERROR_OFFSET])
461 ide_request_region(hwif->io_ports[IDE_ERROR_OFFSET], 1, hwif->name);
462 if (hwif->io_ports[IDE_NSECTOR_OFFSET])
463 ide_request_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1, hwif->name);
464 if (hwif->io_ports[IDE_SECTOR_OFFSET])
465 ide_request_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1, hwif->name);
466 if (hwif->io_ports[IDE_LCYL_OFFSET])
467 ide_request_region(hwif->io_ports[IDE_LCYL_OFFSET], 1, hwif->name);
468 if (hwif->io_ports[IDE_HCYL_OFFSET])
469 ide_request_region(hwif->io_ports[IDE_HCYL_OFFSET], 1, hwif->name);
470 if (hwif->io_ports[IDE_SELECT_OFFSET])
471 ide_request_region(hwif->io_ports[IDE_SELECT_OFFSET], 1, hwif->name);
472 if (hwif->io_ports[IDE_STATUS_OFFSET])
473 ide_request_region(hwif->io_ports[IDE_STATUS_OFFSET], 1, hwif->name);
474
475 jump_straight8:
476 if (hwif->io_ports[IDE_CONTROL_OFFSET])
477 ide_request_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1, hwif->name);
478 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
479 if (hwif->io_ports[IDE_IRQ_OFFSET])
480 ide_request_region(hwif->io_ports[IDE_IRQ_OFFSET], 1, hwif->name);
481 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
482 }
483
484 /*
485 * This routine only knows how to look for drive units 0 and 1
486 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
487 */
488 static void probe_hwif (ide_hwif_t *hwif)
489 {
490 unsigned int unit;
491 unsigned long flags;
492
493 if (hwif->noprobe)
494 return;
495 #ifdef CONFIG_BLK_DEV_IDE
496 if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA) {
497 extern void probe_cmos_for_drives(ide_hwif_t *);
498
499 probe_cmos_for_drives (hwif);
500 }
501 #endif
502
503 if ((hwif->chipset != ide_4drives || !hwif->mate->present) &&
504 #if CONFIG_BLK_DEV_PDC4030
505 (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
506 #endif /* CONFIG_BLK_DEV_PDC4030 */
507 (hwif_check_regions(hwif))) {
508 int msgout = 0;
509 for (unit = 0; unit < MAX_DRIVES; ++unit) {
510 ide_drive_t *drive = &hwif->drives[unit];
511 if (drive->present) {
512 drive->present = 0;
513 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
514 msgout = 1;
515 }
516 }
517 if (!msgout)
518 printk("%s: ports already in use, skipping probe\n", hwif->name);
519 return;
520 }
521
522 __save_flags(flags); /* local CPU only */
523 __sti(); /* local CPU only; needed for jiffies and irq probing */
524 /*
525 * Second drive should only exist if first drive was found,
526 * but a lot of cdrom drives are configured as single slaves.
527 */
528 for (unit = 0; unit < MAX_DRIVES; ++unit) {
529 ide_drive_t *drive = &hwif->drives[unit];
530 (void) probe_for_drive (drive);
531 if (drive->present && !hwif->present) {
532 hwif->present = 1;
533 if (hwif->chipset != ide_4drives || !hwif->mate->present) {
534 hwif_register(hwif);
535 }
536 }
537 }
538 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
539 unsigned long timeout = jiffies + WAIT_WORSTCASE;
540 byte stat;
541
542 printk("%s: reset\n", hwif->name);
543 OUT_BYTE(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
544 udelay(10);
545 OUT_BYTE(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
546 do {
547 ide_delay_50ms();
548 stat = IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
549 } while ((stat & BUSY_STAT) && 0 < (signed long)(timeout - jiffies));
550
551 }
552 __restore_flags(flags); /* local CPU only */
553 for (unit = 0; unit < MAX_DRIVES; ++unit) {
554 ide_drive_t *drive = &hwif->drives[unit];
555 if (drive->present) {
556 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
557 if (tuneproc != NULL && drive->autotune == 1)
558 tuneproc(drive, 255); /* auto-tune PIO mode */
559 }
560 }
561 }
562
563 #if MAX_HWIFS > 1
564 /*
565 * save_match() is used to simplify logic in init_irq() below.
566 *
567 * A loophole here is that we may not know about a particular
568 * hwif's irq until after that hwif is actually probed/initialized..
569 * This could be a problem for the case where an hwif is on a
570 * dual interface that requires serialization (eg. cmd640) and another
571 * hwif using one of the same irqs is initialized beforehand.
572 *
573 * This routine detects and reports such situations, but does not fix them.
574 */
575 static void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
576 {
577 ide_hwif_t *m = *match;
578
579 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
580 if (!new->hwgroup)
581 return;
582 printk("%s: potential irq problem with %s and %s\n", hwif->name, new->name, m->name);
583 }
584 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
585 *match = new;
586 }
587 #endif /* MAX_HWIFS > 1 */
588
589 /*
590 * init request queue
591 */
592 static void ide_init_queue(ide_drive_t *drive)
593 {
594 request_queue_t *q = &drive->queue;
595
596 q->queuedata = HWGROUP(drive);
597 blk_init_queue(q, do_ide_request);
598 }
599
600 /*
601 * This routine sets up the irq for an ide interface, and creates a new
602 * hwgroup for the irq/hwif if none was previously assigned.
603 *
604 * Much of the code is for correctly detecting/handling irq sharing
605 * and irq serialization situations. This is somewhat complex because
606 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
607 *
608 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
609 * interrupts completely disabled. This can be bad for interrupt latency,
610 * but anything else has led to problems on some machines. We re-enable
611 * interrupts as much as we can safely do in most places.
612 */
613 static int init_irq (ide_hwif_t *hwif)
614 {
615 unsigned long flags;
616 unsigned int index;
617 ide_hwgroup_t *hwgroup;
618 ide_hwif_t *match = NULL;
619
620 save_flags(flags); /* all CPUs */
621 cli(); /* all CPUs */
622
623 hwif->hwgroup = NULL;
624 #if MAX_HWIFS > 1
625 /*
626 * Group up with any other hwifs that share our irq(s).
627 */
628 for (index = 0; index < MAX_HWIFS; index++) {
629 ide_hwif_t *h = &ide_hwifs[index];
630 if (h->hwgroup) { /* scan only initialized hwif's */
631 if (hwif->irq == h->irq) {
632 hwif->sharing_irq = h->sharing_irq = 1;
633 if (hwif->chipset != ide_pci || h->chipset != ide_pci) {
634 save_match(hwif, h, &match);
635 }
636 }
637 if (hwif->serialized) {
638 if (hwif->mate && hwif->mate->irq == h->irq)
639 save_match(hwif, h, &match);
640 }
641 if (h->serialized) {
642 if (h->mate && hwif->irq == h->mate->irq)
643 save_match(hwif, h, &match);
644 }
645 }
646 }
647 #endif /* MAX_HWIFS > 1 */
648 /*
649 * If we are still without a hwgroup, then form a new one
650 */
651 if (match) {
652 hwgroup = match->hwgroup;
653 } else {
654 hwgroup = kmalloc(sizeof(ide_hwgroup_t), GFP_KERNEL);
655 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
656 hwgroup->hwif = hwif->next = hwif;
657 hwgroup->rq = NULL;
658 hwgroup->handler = NULL;
659 hwgroup->drive = NULL;
660 hwgroup->busy = 0;
661 init_timer(&hwgroup->timer);
662 hwgroup->timer.function = &ide_timer_expiry;
663 hwgroup->timer.data = (unsigned long) hwgroup;
664 }
665
666 /*
667 * Allocate the irq, if not already obtained for another hwif
668 */
669 if (!match || match->irq != hwif->irq) {
670 #ifdef CONFIG_IDEPCI_SHARE_IRQ
671 int sa = (hwif->chipset == ide_pci) ? SA_SHIRQ : SA_INTERRUPT;
672 #else /* !CONFIG_IDEPCI_SHARE_IRQ */
673 int sa = (hwif->chipset == ide_pci) ? SA_INTERRUPT|SA_SHIRQ : SA_INTERRUPT;
674 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
675 if (ide_request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwgroup)) {
676 if (!match)
677 kfree(hwgroup);
678 restore_flags(flags); /* all CPUs */
679 return 1;
680 }
681 }
682
683 /*
684 * Everything is okay, so link us into the hwgroup
685 */
686 hwif->hwgroup = hwgroup;
687 hwif->next = hwgroup->hwif->next;
688 hwgroup->hwif->next = hwif;
689
690 for (index = 0; index < MAX_DRIVES; ++index) {
691 ide_drive_t *drive = &hwif->drives[index];
692 if (!drive->present)
693 continue;
694 if (!hwgroup->drive)
695 hwgroup->drive = drive;
696 drive->next = hwgroup->drive->next;
697 hwgroup->drive->next = drive;
698 ide_init_queue(drive);
699 }
700 if (!hwgroup->hwif) {
701 hwgroup->hwif = HWIF(hwgroup->drive);
702 #ifdef DEBUG
703 printk("%s : Adding missed hwif to hwgroup!!\n", hwif->name);
704 #endif
705 }
706 restore_flags(flags); /* all CPUs; safe now that hwif->hwgroup is set up */
707
708 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
709 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
710 hwif->io_ports[IDE_DATA_OFFSET],
711 hwif->io_ports[IDE_DATA_OFFSET]+7,
712 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
713 #elif defined(__sparc__)
714 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
715 hwif->io_ports[IDE_DATA_OFFSET],
716 hwif->io_ports[IDE_DATA_OFFSET]+7,
717 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
718 #else
719 printk("%s at %p on irq 0x%08x", hwif->name,
720 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
721 #endif /* __mc68000__ && CONFIG_APUS */
722 if (match)
723 printk(" (%sed with %s)",
724 hwif->sharing_irq ? "shar" : "serializ", match->name);
725 printk("\n");
726 return 0;
727 }
728
729 /*
730 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
731 * after probing for drives, to allocate partition tables and other data
732 * structures needed for the routines in genhd.c. ide_geninit() gets called
733 * somewhat later, during the partition check.
734 */
735 static void init_gendisk (ide_hwif_t *hwif)
736 {
737 struct gendisk *gd, **gdp;
738 unsigned int unit, units, minors;
739 int *bs, *max_sect, *max_ra;
740 extern devfs_handle_t ide_devfs_handle;
741
742 /* figure out maximum drive number on the interface */
743 for (units = MAX_DRIVES; units > 0; --units) {
744 if (hwif->drives[units-1].present)
745 break;
746 }
747 minors = units * (1<<PARTN_BITS);
748 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
749 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
750 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
751 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
752 max_sect = kmalloc (minors*sizeof(int), GFP_KERNEL);
753 max_ra = kmalloc (minors*sizeof(int), GFP_KERNEL);
754
755 memset(gd->part, 0, minors * sizeof(struct hd_struct));
756
757 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
758 blksize_size[hwif->major] = bs;
759 max_sectors[hwif->major] = max_sect;
760 max_readahead[hwif->major] = max_ra;
761 for (unit = 0; unit < minors; ++unit) {
762 *bs++ = BLOCK_SIZE;
763 #ifdef CONFIG_BLK_DEV_PDC4030
764 *max_sect++ = ((hwif->chipset == ide_pdc4030) ? 127 : MAX_SECTORS);
765 #else
766 *max_sect++ = MAX_SECTORS;
767 #endif
768 *max_ra++ = MAX_READAHEAD;
769 }
770
771 for (unit = 0; unit < units; ++unit)
772 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
773
774 gd->major = hwif->major; /* our major device number */
775 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
776 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
777 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
778 gd->nr_real = units; /* current num real drives */
779 gd->real_devices= hwif; /* ptr to internal data */
780 gd->next = NULL; /* linked list of major devs */
781 gd->fops = ide_fops; /* file operations */
782 gd->de_arr = kmalloc (sizeof *gd->de_arr * units, GFP_KERNEL);
783 gd->flags = kmalloc (sizeof *gd->flags * units, GFP_KERNEL);
784 if (gd->de_arr)
785 memset (gd->de_arr, 0, sizeof *gd->de_arr * units);
786 if (gd->flags)
787 memset (gd->flags, 0, sizeof *gd->flags * units);
788
789 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
790 hwif->gd = *gdp = gd; /* link onto tail of list */
791
792 for (unit = 0; unit < units; ++unit) {
793 if (hwif->drives[unit].present) {
794 char name[64];
795
796 ide_add_generic_settings(hwif->drives + unit);
797 hwif->drives[unit].dn = ((hwif->channel ? 2 : 0) + unit);
798 sprintf (name, "host%d/bus%d/target%d/lun%d",
799 (hwif->channel && hwif->mate) ? hwif->mate->index : hwif->index,
800 hwif->channel, unit, hwif->drives[unit].lun);
801 hwif->drives[unit].de =
802 devfs_mk_dir (ide_devfs_handle, name, NULL);
803 }
804 }
805 }
806
807 static int hwif_init (ide_hwif_t *hwif)
808 {
809 if (!hwif->present)
810 return 0;
811 if (!hwif->irq) {
812 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
813 {
814 printk("%s: DISABLED, NO IRQ\n", hwif->name);
815 return (hwif->present = 0);
816 }
817 }
818 #ifdef CONFIG_BLK_DEV_HD
819 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
820 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
821 return (hwif->present = 0);
822 }
823 #endif /* CONFIG_BLK_DEV_HD */
824
825 hwif->present = 0; /* we set it back to 1 if all is ok below */
826
827 if (devfs_register_blkdev (hwif->major, hwif->name, ide_fops)) {
828 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
829 return (hwif->present = 0);
830 }
831
832 if (init_irq(hwif)) {
833 int i = hwif->irq;
834 /*
835 * It failed to initialise. Find the default IRQ for
836 * this port and try that.
837 */
838 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
839 printk("%s: Disabled unable to get IRQ %d.\n", hwif->name, i);
840 (void) unregister_blkdev (hwif->major, hwif->name);
841 return (hwif->present = 0);
842 }
843 if (init_irq(hwif)) {
844 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
845 hwif->name, i, hwif->irq);
846 (void) unregister_blkdev (hwif->major, hwif->name);
847 return (hwif->present = 0);
848 }
849 printk("%s: probed IRQ %d failed, using default.\n",
850 hwif->name, hwif->irq);
851 }
852
853 init_gendisk(hwif);
854 blk_dev[hwif->major].data = hwif;
855 blk_dev[hwif->major].queue = ide_get_queue;
856 read_ahead[hwif->major] = 8; /* (4kB) */
857 hwif->present = 1; /* success */
858
859 #if (DEBUG_SPINLOCK > 0)
860 {
861 static int done = 0;
862 if (!done++)
863 printk("io_request_lock is %p\n", &io_request_lock); /* FIXME */
864 }
865 #endif
866 return hwif->present;
867 }
868
869 int ideprobe_init (void);
870 static ide_module_t ideprobe_module = {
871 IDE_PROBE_MODULE,
872 ideprobe_init,
873 NULL
874 };
875
876 int ideprobe_init (void)
877 {
878 unsigned int index;
879 int probe[MAX_HWIFS];
880
881 MOD_INC_USE_COUNT;
882 memset(probe, 0, MAX_HWIFS * sizeof(int));
883 for (index = 0; index < MAX_HWIFS; ++index)
884 probe[index] = !ide_hwifs[index].present;
885
886 /*
887 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
888 */
889 for (index = 0; index < MAX_HWIFS; ++index)
890 if (probe[index])
891 probe_hwif(&ide_hwifs[index]);
892 for (index = 0; index < MAX_HWIFS; ++index)
893 if (probe[index])
894 hwif_init(&ide_hwifs[index]);
895 if (!ide_probe)
896 ide_probe = &ideprobe_module;
897 MOD_DEC_USE_COUNT;
898 return 0;
899 }
900
901 #ifdef MODULE
902 int init_module (void)
903 {
904 unsigned int index;
905
906 for (index = 0; index < MAX_HWIFS; ++index)
907 ide_unregister(index);
908 ideprobe_init();
909 create_proc_ide_interfaces();
910 return 0;
911 }
912
913 void cleanup_module (void)
914 {
915 ide_probe = NULL;
916 }
917 #endif /* MODULE */
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