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Import 2.3.48
[davej-history.git] / drivers / block / ide-probe.c
blob24eef80b7c8deac76805fbcc0c219991ff522a79
1 /*
2 * linux/drivers/block/ide-probe.c Version 1.05 July 3, 1999
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 *
11 * See linux/MAINTAINERS for address of current maintainer.
12 *
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
14 *
15 * Version 1.00 move drive probing code from ide.c to ide-probe.c
16 * Version 1.01 fix compilation problem for m68k
17 * Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
18 * by Andrea Arcangeli
19 * Version 1.03 fix for (hwif->chipset == ide_4drives)
20 * Version 1.04 fixed buggy treatments of known flash memory cards
21 *
22 * Version 1.05 fix for (hwif->chipset == ide_pdc4030)
23 * added ide6/7/8/9
24 * allowed for secondary flash card to be detectable
25 * with new flag : drive->ata_flash : 1;
26 */
27
28 #undef REALLY_SLOW_IO /* most systems can safely undef this */
29
30 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/timer.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/major.h>
39 #include <linux/errno.h>
40 #include <linux/genhd.h>
41 #include <linux/malloc.h>
42 #include <linux/delay.h>
43 #include <linux/ide.h>
44
45 #include <asm/byteorder.h>
46 #include <asm/irq.h>
47 #include <asm/uaccess.h>
48 #include <asm/io.h>
49
50 static inline void do_identify (ide_drive_t *drive, byte cmd)
51 {
52 int bswap = 1;
53 struct hd_driveid *id;
54
55 id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_ATOMIC); /* called with interrupts disabled! */
56 ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
57 ide__sti(); /* local CPU only */
58 ide_fix_driveid(id);
59 if (!drive->forced_lun)
60 drive->last_lun = id->last_lun & 0x7;
61 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
62 /*
63 * EATA SCSI controllers do a hardware ATA emulation:
64 * Ignore them if there is a driver for them available.
65 */
66 if ((id->model[0] == 'P' && id->model[1] == 'M')
67 || (id->model[0] == 'S' && id->model[1] == 'K')) {
68 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
69 drive->present = 0;
70 return;
71 }
72 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
73
74 /*
75 * WIN_IDENTIFY returns little-endian info,
76 * WIN_PIDENTIFY *usually* returns little-endian info.
77 */
78 if (cmd == WIN_PIDENTIFY) {
79 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
80 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
81 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
82 bswap ^= 1; /* Vertos drives may still be weird */
83 }
84 ide_fixstring (id->model, sizeof(id->model), bswap);
85 ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
86 ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
87
88 if (strstr(id->model, "E X A B Y T E N E S T"))
89 return;
90
91 id->model[sizeof(id->model)-1] = '\0'; /* we depend on this a lot! */
92 printk("%s: %s, ", drive->name, id->model);
93 drive->present = 1;
94
95 /*
96 * Check for an ATAPI device
97 */
98 if (cmd == WIN_PIDENTIFY) {
99 byte type = (id->config >> 8) & 0x1f;
100 printk("ATAPI ");
101 #ifdef CONFIG_BLK_DEV_PDC4030
102 if (HWIF(drive)->channel == 1 && HWIF(drive)->chipset == ide_pdc4030) {
103 printk(" -- not supported on 2nd Promise port\n");
104 drive->present = 0;
105 return;
106 }
107 #endif /* CONFIG_BLK_DEV_PDC4030 */
108 switch (type) {
109 case ide_floppy:
110 if (!strstr(id->model, "CD-ROM")) {
111 if (!strstr(id->model, "oppy") && !strstr(id->model, "poyp") && !strstr(id->model, "ZIP"))
112 printk("cdrom or floppy?, assuming ");
113 if (drive->media != ide_cdrom) {
114 printk ("FLOPPY");
115 break;
116 }
117 }
118 type = ide_cdrom; /* Early cdrom models used zero */
119 case ide_cdrom:
120 drive->removable = 1;
121 #ifdef CONFIG_PPC
122 /* kludge for Apple PowerBook internal zip */
123 if (!strstr(id->model, "CD-ROM") && strstr(id->model, "ZIP")) {
124 printk ("FLOPPY");
125 type = ide_floppy;
126 break;
127 }
128 #endif
129 printk ("CDROM");
130 break;
131 case ide_tape:
132 printk ("TAPE");
133 break;
134 case ide_optical:
135 printk ("OPTICAL");
136 drive->removable = 1;
137 break;
138 default:
139 printk("UNKNOWN (type %d)", type);
140 break;
141 }
142 printk (" drive\n");
143 drive->media = type;
144 return;
145 }
146
147 /*
148 * Not an ATAPI device: looks like a "regular" hard disk
149 */
150 if (id->config & (1<<7))
151 drive->removable = 1;
152 /*
153 * Prevent long system lockup probing later for non-existant
154 * slave drive if the hwif is actually a flash memory card of some variety:
155 */
156 if (drive_is_flashcard(drive)) {
157 ide_drive_t *mate = &HWIF(drive)->drives[1^drive->select.b.unit];
158 if (!mate->ata_flash) {
159 mate->present = 0;
160 mate->noprobe = 1;
161 }
162 }
163 drive->media = ide_disk;
164 printk("ATA DISK drive\n");
165 return;
166 }
167
168 /*
169 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
170 * and waits for a response. It also monitors irqs while this is
171 * happening, in hope of automatically determining which one is
172 * being used by the interface.
173 *
174 * Returns: 0 device was identified
175 * 1 device timed-out (no response to identify request)
176 * 2 device aborted the command (refused to identify itself)
177 */
178 static int try_to_identify (ide_drive_t *drive, byte cmd)
179 {
180 int rc;
181 ide_ioreg_t hd_status;
182 unsigned long timeout;
183 unsigned long irqs = 0;
184 byte s, a;
185
186 if (IDE_CONTROL_REG) {
187 if (!HWIF(drive)->irq) { /* already got an IRQ? */
188 probe_irq_off(probe_irq_on()); /* clear dangling irqs */
189 irqs = probe_irq_on(); /* start monitoring irqs */
190 OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
191 }
192
193 ide_delay_50ms(); /* take a deep breath */
194 a = IN_BYTE(IDE_ALTSTATUS_REG);
195 s = IN_BYTE(IDE_STATUS_REG);
196 if ((a ^ s) & ~INDEX_STAT) {
197 printk("%s: probing with STATUS(0x%02x) instead of ALTSTATUS(0x%02x)\n", drive->name, s, a);
198 hd_status = IDE_STATUS_REG; /* ancient Seagate drives, broken interfaces */
199 } else {
200 hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
201 }
202 } else {
203 ide_delay_50ms();
204 hd_status = IDE_STATUS_REG;
205 }
206
207 #if CONFIG_BLK_DEV_PDC4030
208 if (HWIF(drive)->chipset == ide_pdc4030) {
209 /* DC4030 hosted drives need their own identify... */
210 extern int pdc4030_identify(ide_drive_t *);
211 if (pdc4030_identify(drive)) {
212 if (irqs)
213 (void) probe_irq_off(irqs);
214 return 1;
215 }
216 } else
217 #endif /* CONFIG_BLK_DEV_PDC4030 */
218 OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
219 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
220 timeout += jiffies;
221 do {
222 if (0 < (signed long)(jiffies - timeout)) {
223 if (irqs)
224 (void) probe_irq_off(irqs);
225 return 1; /* drive timed-out */
226 }
227 ide_delay_50ms(); /* give drive a breather */
228 } while (IN_BYTE(hd_status) & BUSY_STAT);
229
230 ide_delay_50ms(); /* wait for IRQ and DRQ_STAT */
231 if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
232 unsigned long flags;
233 __save_flags(flags); /* local CPU only */
234 __cli(); /* local CPU only; some systems need this */
235 do_identify(drive, cmd); /* drive returned ID */
236 rc = 0; /* drive responded with ID */
237 (void) GET_STAT(); /* clear drive IRQ */
238 __restore_flags(flags); /* local CPU only */
239 } else
240 rc = 2; /* drive refused ID */
241 if (IDE_CONTROL_REG && !HWIF(drive)->irq) {
242 irqs = probe_irq_off(irqs); /* get our irq number */
243 if (irqs > 0) {
244 HWIF(drive)->irq = irqs; /* save it for later */
245 irqs = probe_irq_on();
246 OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* mask device irq */
247 udelay(5);
248 (void) probe_irq_off(irqs);
249 (void) probe_irq_off(probe_irq_on()); /* clear self-inflicted irq */
250 (void) GET_STAT(); /* clear drive IRQ */
251
252 } else { /* Mmmm.. multiple IRQs.. don't know which was ours */
253 printk("%s: IRQ probe failed (%ld)\n", drive->name, irqs);
254 #ifdef CONFIG_BLK_DEV_CMD640
255 #ifdef CMD640_DUMP_REGS
256 if (HWIF(drive)->chipset == ide_cmd640) {
257 printk("%s: Hmmm.. probably a driver problem.\n", drive->name);
258 CMD640_DUMP_REGS;
259 }
260 #endif /* CMD640_DUMP_REGS */
261 #endif /* CONFIG_BLK_DEV_CMD640 */
262 }
263 }
264 return rc;
265 }
266
267 /*
268 * do_probe() has the difficult job of finding a drive if it exists,
269 * without getting hung up if it doesn't exist, without trampling on
270 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
271 *
272 * If a drive is "known" to exist (from CMOS or kernel parameters),
273 * but does not respond right away, the probe will "hang in there"
274 * for the maximum wait time (about 30 seconds), otherwise it will
275 * exit much more quickly.
276 *
277 * Returns: 0 device was identified
278 * 1 device timed-out (no response to identify request)
279 * 2 device aborted the command (refused to identify itself)
280 * 3 bad status from device (possible for ATAPI drives)
281 * 4 probe was not attempted because failure was obvious
282 */
283 static int do_probe (ide_drive_t *drive, byte cmd)
284 {
285 int rc;
286 ide_hwif_t *hwif = HWIF(drive);
287 if (drive->present) { /* avoid waiting for inappropriate probes */
288 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
289 return 4;
290 }
291 #ifdef DEBUG
292 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
293 drive->name, drive->present, drive->media,
294 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
295 #endif
296 ide_delay_50ms(); /* needed for some systems (e.g. crw9624 as drive0 with disk as slave) */
297 SELECT_DRIVE(hwif,drive);
298 ide_delay_50ms();
299 if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
300 if (drive->select.b.unit != 0) {
301 SELECT_DRIVE(hwif,&hwif->drives[0]); /* exit with drive0 selected */
302 ide_delay_50ms(); /* allow BUSY_STAT to assert & clear */
303 }
304 return 3; /* no i/f present: mmm.. this should be a 4 -ml */
305 }
306
307 if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
308 || drive->present || cmd == WIN_PIDENTIFY)
309 {
310 if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
311 rc = try_to_identify(drive,cmd); /* failed: try again */
312 if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune != 2) {
313 unsigned long timeout;
314 printk("%s: no response (status = 0x%02x), resetting drive\n", drive->name, GET_STAT());
315 ide_delay_50ms();
316 OUT_BYTE (drive->select.all, IDE_SELECT_REG);
317 ide_delay_50ms();
318 OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
319 timeout = jiffies;
320 while ((GET_STAT() & BUSY_STAT) && time_before(jiffies, timeout + WAIT_WORSTCASE))
321 ide_delay_50ms();
322 rc = try_to_identify(drive, cmd);
323 }
324 if (rc == 1)
325 printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
326 (void) GET_STAT(); /* ensure drive irq is clear */
327 } else {
328 rc = 3; /* not present or maybe ATAPI */
329 }
330 if (drive->select.b.unit != 0) {
331 SELECT_DRIVE(hwif,&hwif->drives[0]); /* exit with drive0 selected */
332 ide_delay_50ms();
333 (void) GET_STAT(); /* ensure drive irq is clear */
334 }
335 return rc;
336 }
337
338 /*
339 *
340 */
341 static void enable_nest (ide_drive_t *drive)
342 {
343 unsigned long timeout;
344
345 printk("%s: enabling %s -- ", HWIF(drive)->name, drive->id->model);
346 SELECT_DRIVE(HWIF(drive), drive);
347 ide_delay_50ms();
348 OUT_BYTE(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
349 timeout = jiffies + WAIT_WORSTCASE;
350 do {
351 if (jiffies > timeout) {
352 printk("failed (timeout)\n");
353 return;
354 }
355 ide_delay_50ms();
356 } while (GET_STAT() & BUSY_STAT);
357 ide_delay_50ms();
358 if (!OK_STAT(GET_STAT(), 0, BAD_STAT))
359 printk("failed (status = 0x%02x)\n", GET_STAT());
360 else
361 printk("success\n");
362 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
363 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
364 }
365 }
366
367 /*
368 * probe_for_drive() tests for existence of a given drive using do_probe().
369 *
370 * Returns: 0 no device was found
371 * 1 device was found (note: drive->present might still be 0)
372 */
373 static inline byte probe_for_drive (ide_drive_t *drive)
374 {
375 if (drive->noprobe) /* skip probing? */
376 return drive->present;
377 if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
378 (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
379 }
380 if (drive->id && strstr(drive->id->model, "E X A B Y T E N E S T"))
381 enable_nest(drive);
382 if (!drive->present)
383 return 0; /* drive not found */
384 if (drive->id == NULL) { /* identification failed? */
385 if (drive->media == ide_disk) {
386 printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
387 drive->name, drive->cyl, drive->head, drive->sect);
388 } else if (drive->media == ide_cdrom) {
389 printk("%s: ATAPI cdrom (?)\n", drive->name);
390 } else {
391 drive->present = 0; /* nuke it */
392 }
393 }
394 return 1; /* drive was found */
395 }
396
397 /*
398 * Calculate the region that this interface occupies,
399 * handling interfaces where the registers may not be
400 * ordered sanely. We deal with the CONTROL register
401 * separately.
402 */
403 static int hwif_check_regions (ide_hwif_t *hwif)
404 {
405 int region_errors = 0;
406
407 region_errors = ide_check_region(hwif->io_ports[IDE_DATA_OFFSET], 1);
408 region_errors += ide_check_region(hwif->io_ports[IDE_ERROR_OFFSET], 1);
409 region_errors += ide_check_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1);
410 region_errors += ide_check_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1);
411 region_errors += ide_check_region(hwif->io_ports[IDE_LCYL_OFFSET], 1);
412 region_errors += ide_check_region(hwif->io_ports[IDE_HCYL_OFFSET], 1);
413 region_errors += ide_check_region(hwif->io_ports[IDE_SELECT_OFFSET], 1);
414 region_errors += ide_check_region(hwif->io_ports[IDE_STATUS_OFFSET], 1);
415 if (hwif->io_ports[IDE_CONTROL_OFFSET])
416 region_errors += ide_check_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
417 if (hwif->io_ports[IDE_IRQ_OFFSET])
418 region_errors += ide_check_region(hwif->io_ports[IDE_IRQ_OFFSET], 1);
419
420 return(region_errors);
421 }
422
423 static void hwif_register (ide_hwif_t *hwif)
424 {
425 if (hwif->io_ports[IDE_DATA_OFFSET])
426 ide_request_region(hwif->io_ports[IDE_DATA_OFFSET], 1, hwif->name);
427 if (hwif->io_ports[IDE_ERROR_OFFSET])
428 ide_request_region(hwif->io_ports[IDE_ERROR_OFFSET], 1, hwif->name);
429 if (hwif->io_ports[IDE_NSECTOR_OFFSET])
430 ide_request_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1, hwif->name);
431 if (hwif->io_ports[IDE_SECTOR_OFFSET])
432 ide_request_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1, hwif->name);
433 if (hwif->io_ports[IDE_LCYL_OFFSET])
434 ide_request_region(hwif->io_ports[IDE_LCYL_OFFSET], 1, hwif->name);
435 if (hwif->io_ports[IDE_HCYL_OFFSET])
436 ide_request_region(hwif->io_ports[IDE_HCYL_OFFSET], 1, hwif->name);
437 if (hwif->io_ports[IDE_SELECT_OFFSET])
438 ide_request_region(hwif->io_ports[IDE_SELECT_OFFSET], 1, hwif->name);
439 if (hwif->io_ports[IDE_STATUS_OFFSET])
440 ide_request_region(hwif->io_ports[IDE_STATUS_OFFSET], 1, hwif->name);
441 if (hwif->io_ports[IDE_CONTROL_OFFSET])
442 ide_request_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1, hwif->name);
443 if (hwif->io_ports[IDE_IRQ_OFFSET])
444 ide_request_region(hwif->io_ports[IDE_IRQ_OFFSET], 1, hwif->name);
445 }
446
447 /*
448 * This routine only knows how to look for drive units 0 and 1
449 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
450 */
451 static void probe_hwif (ide_hwif_t *hwif)
452 {
453 unsigned int unit;
454 unsigned long flags;
455
456 if (hwif->noprobe)
457 return;
458 if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA) {
459 extern void probe_cmos_for_drives(ide_hwif_t *);
460
461 probe_cmos_for_drives (hwif);
462 }
463
464 if ((hwif->chipset != ide_4drives || !hwif->mate->present) &&
465 #if CONFIG_BLK_DEV_PDC4030
466 (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
467 #endif /* CONFIG_BLK_DEV_PDC4030 */
468 (hwif_check_regions(hwif))) {
469 int msgout = 0;
470 for (unit = 0; unit < MAX_DRIVES; ++unit) {
471 ide_drive_t *drive = &hwif->drives[unit];
472 if (drive->present) {
473 drive->present = 0;
474 printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
475 msgout = 1;
476 }
477 }
478 if (!msgout)
479 printk("%s: ports already in use, skipping probe\n", hwif->name);
480 return;
481 }
482
483 __save_flags(flags); /* local CPU only */
484 __sti(); /* local CPU only; needed for jiffies and irq probing */
485 /*
486 * Second drive should only exist if first drive was found,
487 * but a lot of cdrom drives are configured as single slaves.
488 */
489 for (unit = 0; unit < MAX_DRIVES; ++unit) {
490 ide_drive_t *drive = &hwif->drives[unit];
491 (void) probe_for_drive (drive);
492 if (drive->present && !hwif->present) {
493 hwif->present = 1;
494 if (hwif->chipset != ide_4drives || !hwif->mate->present) {
495 hwif_register(hwif);
496 }
497 }
498 }
499 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
500 unsigned long timeout = jiffies + WAIT_WORSTCASE;
501 byte stat;
502
503 printk("%s: reset\n", hwif->name);
504 OUT_BYTE(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
505 udelay(10);
506 OUT_BYTE(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
507 do {
508 ide_delay_50ms();
509 stat = IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
510 } while ((stat & BUSY_STAT) && 0 < (signed long)(timeout - jiffies));
511
512 }
513 __restore_flags(flags); /* local CPU only */
514 for (unit = 0; unit < MAX_DRIVES; ++unit) {
515 ide_drive_t *drive = &hwif->drives[unit];
516 if (drive->present) {
517 ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
518 if (tuneproc != NULL && drive->autotune == 1)
519 tuneproc(drive, 255); /* auto-tune PIO mode */
520 }
521 }
522 }
523
524 #if MAX_HWIFS > 1
525 /*
526 * save_match() is used to simplify logic in init_irq() below.
527 *
528 * A loophole here is that we may not know about a particular
529 * hwif's irq until after that hwif is actually probed/initialized..
530 * This could be a problem for the case where an hwif is on a
531 * dual interface that requires serialization (eg. cmd640) and another
532 * hwif using one of the same irqs is initialized beforehand.
533 *
534 * This routine detects and reports such situations, but does not fix them.
535 */
536 static void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
537 {
538 ide_hwif_t *m = *match;
539
540 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
541 if (!new->hwgroup)
542 return;
543 printk("%s: potential irq problem with %s and %s\n", hwif->name, new->name, m->name);
544 }
545 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
546 *match = new;
547 }
548 #endif /* MAX_HWIFS > 1 */
549
550 /*
551 * This routine sets up the irq for an ide interface, and creates a new
552 * hwgroup for the irq/hwif if none was previously assigned.
553 *
554 * Much of the code is for correctly detecting/handling irq sharing
555 * and irq serialization situations. This is somewhat complex because
556 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
557 *
558 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
559 * interrupts completely disabled. This can be bad for interrupt latency,
560 * but anything else has led to problems on some machines. We re-enable
561 * interrupts as much as we can safely do in most places.
562 */
563 static int init_irq (ide_hwif_t *hwif)
564 {
565 unsigned long flags;
566 unsigned int index;
567 ide_hwgroup_t *hwgroup;
568 ide_hwif_t *match = NULL;
569
570 save_flags(flags); /* all CPUs */
571 cli(); /* all CPUs */
572
573 hwif->hwgroup = NULL;
574 #if MAX_HWIFS > 1
575 /*
576 * Group up with any other hwifs that share our irq(s).
577 */
578 for (index = 0; index < MAX_HWIFS; index++) {
579 ide_hwif_t *h = &ide_hwifs[index];
580 if (h->hwgroup) { /* scan only initialized hwif's */
581 if (hwif->irq == h->irq) {
582 hwif->sharing_irq = h->sharing_irq = 1;
583 if (hwif->chipset != ide_pci || h->chipset != ide_pci) {
584 save_match(hwif, h, &match);
585 }
586 }
587 if (hwif->serialized) {
588 if (hwif->mate && hwif->mate->irq == h->irq)
589 save_match(hwif, h, &match);
590 }
591 if (h->serialized) {
592 if (h->mate && hwif->irq == h->mate->irq)
593 save_match(hwif, h, &match);
594 }
595 }
596 }
597 #endif /* MAX_HWIFS > 1 */
598 /*
599 * If we are still without a hwgroup, then form a new one
600 */
601 if (match) {
602 hwgroup = match->hwgroup;
603 } else {
604 hwgroup = kmalloc(sizeof(ide_hwgroup_t), GFP_KERNEL);
605 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
606 hwgroup->hwif = hwif->next = hwif;
607 hwgroup->rq = NULL;
608 hwgroup->handler = NULL;
609 hwgroup->drive = NULL;
610 hwgroup->busy = 0;
611 init_timer(&hwgroup->timer);
612 hwgroup->timer.function = &ide_timer_expiry;
613 hwgroup->timer.data = (unsigned long) hwgroup;
614 }
615
616 /*
617 * Allocate the irq, if not already obtained for another hwif
618 */
619 if (!match || match->irq != hwif->irq) {
620 #ifdef CONFIG_IDEPCI_SHARE_IRQ
621 int sa = (hwif->chipset == ide_pci) ? SA_SHIRQ : SA_INTERRUPT;
622 #else /* !CONFIG_IDEPCI_SHARE_IRQ */
623 int sa = (hwif->chipset == ide_pci) ? SA_INTERRUPT|SA_SHIRQ : SA_INTERRUPT;
624 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
625 if (ide_request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwgroup)) {
626 if (!match)
627 kfree(hwgroup);
628 restore_flags(flags); /* all CPUs */
629 return 1;
630 }
631 }
632
633 /*
634 * Everything is okay, so link us into the hwgroup
635 */
636 hwif->hwgroup = hwgroup;
637 hwif->next = hwgroup->hwif->next;
638 hwgroup->hwif->next = hwif;
639
640 for (index = 0; index < MAX_DRIVES; ++index) {
641 ide_drive_t *drive = &hwif->drives[index];
642 if (!drive->present)
643 continue;
644 if (!hwgroup->drive)
645 hwgroup->drive = drive;
646 drive->next = hwgroup->drive->next;
647 hwgroup->drive->next = drive;
648 }
649 if (!hwgroup->hwif) {
650 hwgroup->hwif = HWIF(hwgroup->drive);
651 #ifdef DEBUG
652 printk("%s : Adding missed hwif to hwgroup!!\n", hwif->name);
653 #endif
654 }
655 restore_flags(flags); /* all CPUs; safe now that hwif->hwgroup is set up */
656
657 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
658 printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
659 hwif->io_ports[IDE_DATA_OFFSET],
660 hwif->io_ports[IDE_DATA_OFFSET]+7,
661 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
662 #elif defined(__sparc__)
663 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
664 hwif->io_ports[IDE_DATA_OFFSET],
665 hwif->io_ports[IDE_DATA_OFFSET]+7,
666 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
667 #else
668 printk("%s at %p on irq 0x%08x", hwif->name,
669 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
670 #endif /* __mc68000__ && CONFIG_APUS */
671 if (match)
672 printk(" (%sed with %s)",
673 hwif->sharing_irq ? "shar" : "serializ", match->name);
674 printk("\n");
675 return 0;
676 }
677
678 /*
679 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
680 * after probing for drives, to allocate partition tables and other data
681 * structures needed for the routines in genhd.c. ide_geninit() gets called
682 * somewhat later, during the partition check.
683 */
684 static void init_gendisk (ide_hwif_t *hwif)
685 {
686 struct gendisk *gd, **gdp;
687 unsigned int unit, units, minors;
688 int *bs, *max_sect, *max_ra;
689
690 /* figure out maximum drive number on the interface */
691 for (units = MAX_DRIVES; units > 0; --units) {
692 if (hwif->drives[units-1].present)
693 break;
694 }
695 minors = units * (1<<PARTN_BITS);
696 gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
697 gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
698 gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
699 bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
700 max_sect = kmalloc (minors*sizeof(int), GFP_KERNEL);
701 max_ra = kmalloc (minors*sizeof(int), GFP_KERNEL);
702
703 memset(gd->part, 0, minors * sizeof(struct hd_struct));
704
705 /* cdroms and msdos f/s are examples of non-1024 blocksizes */
706 blksize_size[hwif->major] = bs;
707 max_sectors[hwif->major] = max_sect;
708 max_readahead[hwif->major] = max_ra;
709 for (unit = 0; unit < minors; ++unit) {
710 *bs++ = BLOCK_SIZE;
711 #ifdef CONFIG_BLK_DEV_PDC4030
712 *max_sect++ = ((hwif->chipset == ide_pdc4030) ? 127 : MAX_SECTORS);
713 #else
714 *max_sect++ = MAX_SECTORS;
715 #endif
716 *max_ra++ = MAX_READAHEAD;
717 }
718
719 for (unit = 0; unit < units; ++unit)
720 hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
721
722 gd->major = hwif->major; /* our major device number */
723 gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
724 gd->minor_shift = PARTN_BITS; /* num bits for partitions */
725 gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
726 gd->nr_real = units; /* current num real drives */
727 gd->real_devices= hwif; /* ptr to internal data */
728 gd->next = NULL; /* linked list of major devs */
729 gd->fops = ide_fops; /* file operations */
730 gd->de_arr = kmalloc (sizeof *gd->de_arr * units, GFP_KERNEL);
731 gd->flags = kmalloc (sizeof *gd->flags * units, GFP_KERNEL);
732 if (gd->de_arr)
733 memset (gd->de_arr, 0, sizeof *gd->de_arr * units);
734 if (gd->flags)
735 memset (gd->flags, 0, sizeof *gd->flags * units);
736
737 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
738 hwif->gd = *gdp = gd; /* link onto tail of list */
739
740 for (unit = 0; unit < units; ++unit) {
741 if (hwif->drives[unit].present) {
742 char name[64];
743
744 ide_add_generic_settings(hwif->drives + unit);
745 sprintf (name, "ide/host%d/bus%d/target%d/lun%d",
746 hwif->channel ? hwif->mate->index : hwif->index,
747 hwif->channel, unit, 0);
748 hwif->drives[unit].de =
749 devfs_mk_dir (NULL, name, 0, NULL);
750 }
751 }
752 }
753
754 static int hwif_init (ide_hwif_t *hwif)
755 {
756 ide_drive_t *drive;
757 void (*rfn)(request_queue_t *);
758
759 if (!hwif->present)
760 return 0;
761 if (!hwif->irq) {
762 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
763 {
764 printk("%s: DISABLED, NO IRQ\n", hwif->name);
765 return (hwif->present = 0);
766 }
767 }
768 #ifdef CONFIG_BLK_DEV_HD
769 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
770 printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
771 return (hwif->present = 0);
772 }
773 #endif /* CONFIG_BLK_DEV_HD */
774
775 hwif->present = 0; /* we set it back to 1 if all is ok below */
776 switch (hwif->major) {
777 case IDE0_MAJOR: rfn = &do_ide0_request; break;
778 #if MAX_HWIFS > 1
779 case IDE1_MAJOR: rfn = &do_ide1_request; break;
780 #endif
781 #if MAX_HWIFS > 2
782 case IDE2_MAJOR: rfn = &do_ide2_request; break;
783 #endif
784 #if MAX_HWIFS > 3
785 case IDE3_MAJOR: rfn = &do_ide3_request; break;
786 #endif
787 #if MAX_HWIFS > 4
788 case IDE4_MAJOR: rfn = &do_ide4_request; break;
789 #endif
790 #if MAX_HWIFS > 5
791 case IDE5_MAJOR: rfn = &do_ide5_request; break;
792 #endif
793 #if MAX_HWIFS > 6
794 case IDE6_MAJOR: rfn = &do_ide6_request; break;
795 #endif
796 #if MAX_HWIFS > 7
797 case IDE7_MAJOR: rfn = &do_ide7_request; break;
798 #endif
799 #if MAX_HWIFS > 8
800 case IDE8_MAJOR: rfn = &do_ide8_request; break;
801 #endif
802 #if MAX_HWIFS > 9
803 case IDE9_MAJOR: rfn = &do_ide9_request; break;
804 #endif
805 default:
806 printk("%s: request_fn NOT DEFINED\n", hwif->name);
807 return (hwif->present = 0);
808 }
809 if (devfs_register_blkdev (hwif->major, hwif->name, ide_fops)) {
810 printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
811 return (hwif->present = 0);
812 }
813
814 if (init_irq(hwif)) {
815 int i = hwif->irq;
816 /*
817 * It failed to initialise. Find the default IRQ for
818 * this port and try that.
819 */
820 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
821 printk("%s: Disabled unable to get IRQ %d.\n", hwif->name, i);
822 (void) unregister_blkdev (hwif->major, hwif->name);
823 return (hwif->present = 0);
824 }
825 if (init_irq(hwif)) {
826 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
827 hwif->name, i, hwif->irq);
828 (void) unregister_blkdev (hwif->major, hwif->name);
829 return (hwif->present = 0);
830 }
831 printk("%s: probed IRQ %d failed, using default.\n",
832 hwif->name, hwif->irq);
833 }
834
835 init_gendisk(hwif);
836 blk_dev[hwif->major].data = hwif;
837 blk_dev[hwif->major].queue = ide_get_queue;
838 read_ahead[hwif->major] = 8; /* (4kB) */
839 hwif->present = 1; /* success */
840
841 /*
842 * FIXME(eric) - This needs to be tested. I *think* that this
843 * is correct. Also, I believe that there is no longer any
844 * reason to have multiple functions (do_ide[0-7]_request)
845 * functions - the queuedata field could be used to indicate
846 * the correct hardware group - either this, or we could add
847 * a new field to request_queue_t to hold this information.
848 */
849 drive = &hwif->drives[0];
850 blk_init_queue(&drive->queue, rfn);
851
852 drive = &hwif->drives[1];
853 blk_init_queue(&drive->queue, rfn);
854
855 #if (DEBUG_SPINLOCK > 0)
856 {
857 static int done = 0;
858 if (!done++)
859 printk("io_request_lock is %p\n", &io_request_lock); /* FIXME */
860 }
861 #endif
862 return hwif->present;
863 }
864
865 int ideprobe_init (void);
866 static ide_module_t ideprobe_module = {
867 IDE_PROBE_MODULE,
868 ideprobe_init,
869 NULL
870 };
871
872 int ideprobe_init (void)
873 {
874 unsigned int index;
875 int probe[MAX_HWIFS];
876
877 MOD_INC_USE_COUNT;
878 memset(probe, 0, MAX_HWIFS * sizeof(int));
879 for (index = 0; index < MAX_HWIFS; ++index)
880 probe[index] = !ide_hwifs[index].present;
881
882 /*
883 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
884 */
885 for (index = 0; index < MAX_HWIFS; ++index)
886 if (probe[index])
887 probe_hwif(&ide_hwifs[index]);
888 for (index = 0; index < MAX_HWIFS; ++index)
889 if (probe[index])
890 hwif_init(&ide_hwifs[index]);
891 if (!ide_probe)
892 ide_probe = &ideprobe_module;
893 MOD_DEC_USE_COUNT;
894 return 0;
895 }
896
897 #ifdef MODULE
898 int init_module (void)
899 {
900 unsigned int index;
901
902 for (index = 0; index < MAX_HWIFS; ++index)
903 ide_unregister(index);
904 ideprobe_init();
905 create_proc_ide_interfaces();
906 return 0;
907 }
908
909 void cleanup_module (void)
910 {
911 ide_probe = NULL;
912 }
913 #endif /* MODULE */
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