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CRED: Wrap task credential accesses in the XFS filesystem
[linux-2.6/mini2440.git] / drivers / ide / ide-probe.c
blob1649ea54f76ce7c194f7ec8f5016f132aec79d0f
1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
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 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16 * by Andrea Arcangeli
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
45 *
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
49 */
50
51 static void generic_id(ide_drive_t *drive)
52 {
53 u16 *id = drive->id;
54
55 id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
56 id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
57 id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
58 }
59
60 static void ide_disk_init_chs(ide_drive_t *drive)
61 {
62 u16 *id = drive->id;
63
64 /* Extract geometry if we did not already have one for the drive */
65 if (!drive->cyl || !drive->head || !drive->sect) {
66 drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS];
67 drive->head = drive->bios_head = id[ATA_ID_HEADS];
68 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
69 }
70
71 /* Handle logical geometry translation by the drive */
72 if (ata_id_current_chs_valid(id)) {
73 drive->cyl = id[ATA_ID_CUR_CYLS];
74 drive->head = id[ATA_ID_CUR_HEADS];
75 drive->sect = id[ATA_ID_CUR_SECTORS];
76 }
77
78 /* Use physical geometry if what we have still makes no sense */
79 if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
80 drive->cyl = id[ATA_ID_CYLS];
81 drive->head = id[ATA_ID_HEADS];
82 drive->sect = id[ATA_ID_SECTORS];
83 }
84 }
85
86 static void ide_disk_init_mult_count(ide_drive_t *drive)
87 {
88 u16 *id = drive->id;
89 u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
90
91 if (max_multsect) {
92 if ((max_multsect / 2) > 1)
93 id[ATA_ID_MULTSECT] = max_multsect | 0x100;
94 else
95 id[ATA_ID_MULTSECT] &= ~0x1ff;
96
97 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
98
99 if (drive->mult_req)
100 drive->special.b.set_multmode = 1;
101 }
102 }
103
104 /**
105 * do_identify - identify a drive
106 * @drive: drive to identify
107 * @cmd: command used
108 *
109 * Called when we have issued a drive identify command to
110 * read and parse the results. This function is run with
111 * interrupts disabled.
112 */
113
114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
115 {
116 ide_hwif_t *hwif = HWIF(drive);
117 u16 *id = drive->id;
118 char *m = (char *)&id[ATA_ID_PROD];
119 int bswap = 1, is_cfa;
120
121 /* read 512 bytes of id info */
122 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
123
124 drive->dev_flags |= IDE_DFLAG_ID_READ;
125
126 local_irq_enable();
127 #ifdef DEBUG
128 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
129 ide_dump_identify((u8 *)id);
130 #endif
131 ide_fix_driveid(id);
132
133 /*
134 * ATA_CMD_ID_ATA returns little-endian info,
135 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
136 */
137 if (cmd == ATA_CMD_ID_ATAPI) {
138 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
139 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
140 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
141 /* Vertos drives may still be weird */
142 bswap ^= 1;
143 }
144
145 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
146 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
147 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
148
149 /* we depend on this a lot! */
150 m[ATA_ID_PROD_LEN - 1] = '\0';
151
152 if (strstr(m, "E X A B Y T E N E S T"))
153 goto err_misc;
154
155 printk(KERN_INFO "%s: %s, ", drive->name, m);
156
157 drive->dev_flags |= IDE_DFLAG_PRESENT;
158 drive->dev_flags &= ~IDE_DFLAG_DEAD;
159
160 /*
161 * Check for an ATAPI device
162 */
163 if (cmd == ATA_CMD_ID_ATAPI) {
164 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
165
166 printk(KERN_CONT "ATAPI ");
167 switch (type) {
168 case ide_floppy:
169 if (!strstr(m, "CD-ROM")) {
170 if (!strstr(m, "oppy") &&
171 !strstr(m, "poyp") &&
172 !strstr(m, "ZIP"))
173 printk(KERN_CONT "cdrom or floppy?, assuming ");
174 if (drive->media != ide_cdrom) {
175 printk(KERN_CONT "FLOPPY");
176 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
177 break;
178 }
179 }
180 /* Early cdrom models used zero */
181 type = ide_cdrom;
182 case ide_cdrom:
183 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
184 #ifdef CONFIG_PPC
185 /* kludge for Apple PowerBook internal zip */
186 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
187 printk(KERN_CONT "FLOPPY");
188 type = ide_floppy;
189 break;
190 }
191 #endif
192 printk(KERN_CONT "CD/DVD-ROM");
193 break;
194 case ide_tape:
195 printk(KERN_CONT "TAPE");
196 break;
197 case ide_optical:
198 printk(KERN_CONT "OPTICAL");
199 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
200 break;
201 default:
202 printk(KERN_CONT "UNKNOWN (type %d)", type);
203 break;
204 }
205 printk(KERN_CONT " drive\n");
206 drive->media = type;
207 /* an ATAPI device ignores DRDY */
208 drive->ready_stat = 0;
209 if (ata_id_cdb_intr(id))
210 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
211 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
212 /* we don't do head unloading on ATAPI devices */
213 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
214 return;
215 }
216
217 /*
218 * Not an ATAPI device: looks like a "regular" hard disk
219 */
220
221 is_cfa = ata_id_is_cfa(id);
222
223 /* CF devices are *not* removable in Linux definition of the term */
224 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
225 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
226
227 drive->media = ide_disk;
228
229 if (!ata_id_has_unload(drive->id))
230 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
231
232 printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
233
234 return;
235
236 err_misc:
237 kfree(id);
238 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
239 return;
240 }
241
242 /**
243 * actual_try_to_identify - send ata/atapi identify
244 * @drive: drive to identify
245 * @cmd: command to use
246 *
247 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
248 * and waits for a response. It also monitors irqs while this is
249 * happening, in hope of automatically determining which one is
250 * being used by the interface.
251 *
252 * Returns: 0 device was identified
253 * 1 device timed-out (no response to identify request)
254 * 2 device aborted the command (refused to identify itself)
255 */
256
257 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
258 {
259 ide_hwif_t *hwif = HWIF(drive);
260 struct ide_io_ports *io_ports = &hwif->io_ports;
261 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
262 int use_altstatus = 0, rc;
263 unsigned long timeout;
264 u8 s = 0, a = 0;
265
266 /* take a deep breath */
267 msleep(50);
268
269 if (io_ports->ctl_addr) {
270 a = tp_ops->read_altstatus(hwif);
271 s = tp_ops->read_status(hwif);
272 if ((a ^ s) & ~ATA_IDX)
273 /* ancient Seagate drives, broken interfaces */
274 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
275 "instead of ALTSTATUS(0x%02x)\n",
276 drive->name, s, a);
277 else
278 /* use non-intrusive polling */
279 use_altstatus = 1;
280 }
281
282 /* set features register for atapi
283 * identify command to be sure of reply
284 */
285 if (cmd == ATA_CMD_ID_ATAPI) {
286 ide_task_t task;
287
288 memset(&task, 0, sizeof(task));
289 /* disable DMA & overlap */
290 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
291
292 tp_ops->tf_load(drive, &task);
293 }
294
295 /* ask drive for ID */
296 tp_ops->exec_command(hwif, cmd);
297
298 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
299
300 if (ide_busy_sleep(hwif, timeout, use_altstatus))
301 return 1;
302
303 /* wait for IRQ and ATA_DRQ */
304 msleep(50);
305 s = tp_ops->read_status(hwif);
306
307 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
308 unsigned long flags;
309
310 /* local CPU only; some systems need this */
311 local_irq_save(flags);
312 /* drive returned ID */
313 do_identify(drive, cmd);
314 /* drive responded with ID */
315 rc = 0;
316 /* clear drive IRQ */
317 (void)tp_ops->read_status(hwif);
318 local_irq_restore(flags);
319 } else {
320 /* drive refused ID */
321 rc = 2;
322 }
323 return rc;
324 }
325
326 /**
327 * try_to_identify - try to identify a drive
328 * @drive: drive to probe
329 * @cmd: command to use
330 *
331 * Issue the identify command and then do IRQ probing to
332 * complete the identification when needed by finding the
333 * IRQ the drive is attached to
334 */
335
336 static int try_to_identify (ide_drive_t *drive, u8 cmd)
337 {
338 ide_hwif_t *hwif = HWIF(drive);
339 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
340 int retval;
341 int autoprobe = 0;
342 unsigned long cookie = 0;
343
344 /*
345 * Disable device irq unless we need to
346 * probe for it. Otherwise we'll get spurious
347 * interrupts during the identify-phase that
348 * the irq handler isn't expecting.
349 */
350 if (hwif->io_ports.ctl_addr) {
351 if (!hwif->irq) {
352 autoprobe = 1;
353 cookie = probe_irq_on();
354 }
355 tp_ops->set_irq(hwif, autoprobe);
356 }
357
358 retval = actual_try_to_identify(drive, cmd);
359
360 if (autoprobe) {
361 int irq;
362
363 tp_ops->set_irq(hwif, 0);
364 /* clear drive IRQ */
365 (void)tp_ops->read_status(hwif);
366 udelay(5);
367 irq = probe_irq_off(cookie);
368 if (!hwif->irq) {
369 if (irq > 0) {
370 hwif->irq = irq;
371 } else {
372 /* Mmmm.. multiple IRQs..
373 * don't know which was ours
374 */
375 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
376 drive->name, cookie);
377 }
378 }
379 }
380 return retval;
381 }
382
383 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
384 {
385 u8 stat;
386
387 timeout += jiffies;
388
389 do {
390 msleep(50); /* give drive a breather */
391 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
392 : hwif->tp_ops->read_status(hwif);
393 if ((stat & ATA_BUSY) == 0)
394 return 0;
395 } while (time_before(jiffies, timeout));
396
397 return 1; /* drive timed-out */
398 }
399
400 static u8 ide_read_device(ide_drive_t *drive)
401 {
402 ide_task_t task;
403
404 memset(&task, 0, sizeof(task));
405 task.tf_flags = IDE_TFLAG_IN_DEVICE;
406
407 drive->hwif->tp_ops->tf_read(drive, &task);
408
409 return task.tf.device;
410 }
411
412 /**
413 * do_probe - probe an IDE device
414 * @drive: drive to probe
415 * @cmd: command to use
416 *
417 * do_probe() has the difficult job of finding a drive if it exists,
418 * without getting hung up if it doesn't exist, without trampling on
419 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
420 *
421 * If a drive is "known" to exist (from CMOS or kernel parameters),
422 * but does not respond right away, the probe will "hang in there"
423 * for the maximum wait time (about 30 seconds), otherwise it will
424 * exit much more quickly.
425 *
426 * Returns: 0 device was identified
427 * 1 device timed-out (no response to identify request)
428 * 2 device aborted the command (refused to identify itself)
429 * 3 bad status from device (possible for ATAPI drives)
430 * 4 probe was not attempted because failure was obvious
431 */
432
433 static int do_probe (ide_drive_t *drive, u8 cmd)
434 {
435 ide_hwif_t *hwif = HWIF(drive);
436 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
437 int rc;
438 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
439
440 /* avoid waiting for inappropriate probes */
441 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
442 return 4;
443
444 #ifdef DEBUG
445 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
446 drive->name, present, drive->media,
447 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
448 #endif
449
450 /* needed for some systems
451 * (e.g. crw9624 as drive0 with disk as slave)
452 */
453 msleep(50);
454 SELECT_DRIVE(drive);
455 msleep(50);
456
457 if (ide_read_device(drive) != drive->select && present == 0) {
458 if (drive->dn & 1) {
459 /* exit with drive0 selected */
460 SELECT_DRIVE(&hwif->drives[0]);
461 /* allow ATA_BUSY to assert & clear */
462 msleep(50);
463 }
464 /* no i/f present: mmm.. this should be a 4 -ml */
465 return 3;
466 }
467
468 stat = tp_ops->read_status(hwif);
469
470 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
471 present || cmd == ATA_CMD_ID_ATAPI) {
472 /* send cmd and wait */
473 if ((rc = try_to_identify(drive, cmd))) {
474 /* failed: try again */
475 rc = try_to_identify(drive,cmd);
476 }
477
478 stat = tp_ops->read_status(hwif);
479
480 if (stat == (ATA_BUSY | ATA_DRDY))
481 return 4;
482
483 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
484 printk(KERN_ERR "%s: no response (status = 0x%02x), "
485 "resetting drive\n", drive->name, stat);
486 msleep(50);
487 SELECT_DRIVE(drive);
488 msleep(50);
489 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
490 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
491 rc = try_to_identify(drive, cmd);
492 }
493
494 /* ensure drive IRQ is clear */
495 stat = tp_ops->read_status(hwif);
496
497 if (rc == 1)
498 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
499 drive->name, stat);
500 } else {
501 /* not present or maybe ATAPI */
502 rc = 3;
503 }
504 if (drive->dn & 1) {
505 /* exit with drive0 selected */
506 SELECT_DRIVE(&hwif->drives[0]);
507 msleep(50);
508 /* ensure drive irq is clear */
509 (void)tp_ops->read_status(hwif);
510 }
511 return rc;
512 }
513
514 /*
515 *
516 */
517 static void enable_nest (ide_drive_t *drive)
518 {
519 ide_hwif_t *hwif = HWIF(drive);
520 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
521 u8 stat;
522
523 printk(KERN_INFO "%s: enabling %s -- ",
524 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
525
526 SELECT_DRIVE(drive);
527 msleep(50);
528 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
529
530 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
531 printk(KERN_CONT "failed (timeout)\n");
532 return;
533 }
534
535 msleep(50);
536
537 stat = tp_ops->read_status(hwif);
538
539 if (!OK_STAT(stat, 0, BAD_STAT))
540 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
541 else
542 printk(KERN_CONT "success\n");
543 }
544
545 /**
546 * probe_for_drives - upper level drive probe
547 * @drive: drive to probe for
548 *
549 * probe_for_drive() tests for existence of a given drive using do_probe()
550 * and presents things to the user as needed.
551 *
552 * Returns: 0 no device was found
553 * 1 device was found
554 * (note: IDE_DFLAG_PRESENT might still be not set)
555 */
556
557 static inline u8 probe_for_drive (ide_drive_t *drive)
558 {
559 char *m;
560
561 /*
562 * In order to keep things simple we have an id
563 * block for all drives at all times. If the device
564 * is pre ATA or refuses ATA/ATAPI identify we
565 * will add faked data to this.
566 *
567 * Also note that 0 everywhere means "can't do X"
568 */
569
570 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
571
572 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
573 if (drive->id == NULL) {
574 printk(KERN_ERR "ide: out of memory for id data.\n");
575 return 0;
576 }
577
578 m = (char *)&drive->id[ATA_ID_PROD];
579 strcpy(m, "UNKNOWN");
580
581 /* skip probing? */
582 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
583 retry:
584 /* if !(success||timed-out) */
585 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
586 /* look for ATAPI device */
587 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
588
589 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
590 /* drive not found */
591 return 0;
592
593 if (strstr(m, "E X A B Y T E N E S T")) {
594 enable_nest(drive);
595 goto retry;
596 }
597
598 /* identification failed? */
599 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
600 if (drive->media == ide_disk) {
601 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
602 drive->name, drive->cyl,
603 drive->head, drive->sect);
604 } else if (drive->media == ide_cdrom) {
605 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
606 } else {
607 /* nuke it */
608 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
609 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
610 }
611 }
612 /* drive was found */
613 }
614
615 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
616 return 0;
617
618 /* The drive wasn't being helpful. Add generic info only */
619 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
620 generic_id(drive);
621 return 1;
622 }
623
624 if (drive->media == ide_disk) {
625 ide_disk_init_chs(drive);
626 ide_disk_init_mult_count(drive);
627 }
628
629 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
630 }
631
632 static void hwif_release_dev(struct device *dev)
633 {
634 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
635
636 complete(&hwif->gendev_rel_comp);
637 }
638
639 static int ide_register_port(ide_hwif_t *hwif)
640 {
641 int ret;
642
643 /* register with global device tree */
644 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
645 hwif->gendev.driver_data = hwif;
646 if (hwif->gendev.parent == NULL) {
647 if (hwif->dev)
648 hwif->gendev.parent = hwif->dev;
649 else
650 /* Would like to do = &device_legacy */
651 hwif->gendev.parent = NULL;
652 }
653 hwif->gendev.release = hwif_release_dev;
654 ret = device_register(&hwif->gendev);
655 if (ret < 0) {
656 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
657 __func__, ret);
658 goto out;
659 }
660
661 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
662 MKDEV(0, 0), hwif, hwif->name);
663 if (IS_ERR(hwif->portdev)) {
664 ret = PTR_ERR(hwif->portdev);
665 device_unregister(&hwif->gendev);
666 }
667 out:
668 return ret;
669 }
670
671 /**
672 * ide_port_wait_ready - wait for port to become ready
673 * @hwif: IDE port
674 *
675 * This is needed on some PPCs and a bunch of BIOS-less embedded
676 * platforms. Typical cases are:
677 *
678 * - The firmware hard reset the disk before booting the kernel,
679 * the drive is still doing it's poweron-reset sequence, that
680 * can take up to 30 seconds.
681 *
682 * - The firmware does nothing (or no firmware), the device is
683 * still in POST state (same as above actually).
684 *
685 * - Some CD/DVD/Writer combo drives tend to drive the bus during
686 * their reset sequence even when they are non-selected slave
687 * devices, thus preventing discovery of the main HD.
688 *
689 * Doing this wait-for-non-busy should not harm any existing
690 * configuration and fix some issues like the above.
691 *
692 * BenH.
693 *
694 * Returns 0 on success, error code (< 0) otherwise.
695 */
696
697 static int ide_port_wait_ready(ide_hwif_t *hwif)
698 {
699 int unit, rc;
700
701 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
702
703 /* Let HW settle down a bit from whatever init state we
704 * come from */
705 mdelay(2);
706
707 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
708 * I know of at least one disk who takes 31 seconds, I use 35
709 * here to be safe
710 */
711 rc = ide_wait_not_busy(hwif, 35000);
712 if (rc)
713 return rc;
714
715 /* Now make sure both master & slave are ready */
716 for (unit = 0; unit < MAX_DRIVES; unit++) {
717 ide_drive_t *drive = &hwif->drives[unit];
718
719 /* Ignore disks that we will not probe for later. */
720 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
721 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
722 SELECT_DRIVE(drive);
723 hwif->tp_ops->set_irq(hwif, 1);
724 mdelay(2);
725 rc = ide_wait_not_busy(hwif, 35000);
726 if (rc)
727 goto out;
728 } else
729 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
730 drive->name);
731 }
732 out:
733 /* Exit function with master reselected (let's be sane) */
734 if (unit)
735 SELECT_DRIVE(&hwif->drives[0]);
736
737 return rc;
738 }
739
740 /**
741 * ide_undecoded_slave - look for bad CF adapters
742 * @dev1: slave device
743 *
744 * Analyse the drives on the interface and attempt to decide if we
745 * have the same drive viewed twice. This occurs with crap CF adapters
746 * and PCMCIA sometimes.
747 */
748
749 void ide_undecoded_slave(ide_drive_t *dev1)
750 {
751 ide_drive_t *dev0 = &dev1->hwif->drives[0];
752
753 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
754 return;
755
756 /* If the models don't match they are not the same product */
757 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
758 (char *)&dev1->id[ATA_ID_PROD]))
759 return;
760
761 /* Serial numbers do not match */
762 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
763 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
764 return;
765
766 /* No serial number, thankfully very rare for CF */
767 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
768 return;
769
770 /* Appears to be an IDE flash adapter with decode bugs */
771 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
772
773 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
774 }
775
776 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
777
778 static int ide_probe_port(ide_hwif_t *hwif)
779 {
780 unsigned long flags;
781 unsigned int irqd;
782 int unit, rc = -ENODEV;
783
784 BUG_ON(hwif->present);
785
786 if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
787 (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
788 return -EACCES;
789
790 /*
791 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
792 * we'll install our IRQ driver much later...
793 */
794 irqd = hwif->irq;
795 if (irqd)
796 disable_irq(hwif->irq);
797
798 local_irq_set(flags);
799
800 if (ide_port_wait_ready(hwif) == -EBUSY)
801 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
802
803 /*
804 * Second drive should only exist if first drive was found,
805 * but a lot of cdrom drives are configured as single slaves.
806 */
807 for (unit = 0; unit < MAX_DRIVES; ++unit) {
808 ide_drive_t *drive = &hwif->drives[unit];
809
810 (void) probe_for_drive(drive);
811 if (drive->dev_flags & IDE_DFLAG_PRESENT)
812 rc = 0;
813 }
814
815 local_irq_restore(flags);
816
817 /*
818 * Use cached IRQ number. It might be (and is...) changed by probe
819 * code above
820 */
821 if (irqd)
822 enable_irq(irqd);
823
824 return rc;
825 }
826
827 static void ide_port_tune_devices(ide_hwif_t *hwif)
828 {
829 const struct ide_port_ops *port_ops = hwif->port_ops;
830 int unit;
831
832 for (unit = 0; unit < MAX_DRIVES; unit++) {
833 ide_drive_t *drive = &hwif->drives[unit];
834
835 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
836 if (port_ops && port_ops->quirkproc)
837 port_ops->quirkproc(drive);
838 }
839 }
840
841 for (unit = 0; unit < MAX_DRIVES; ++unit) {
842 ide_drive_t *drive = &hwif->drives[unit];
843
844 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
845 ide_set_max_pio(drive);
846
847 drive->dev_flags |= IDE_DFLAG_NICE1;
848
849 if (hwif->dma_ops)
850 ide_set_dma(drive);
851 }
852 }
853
854 for (unit = 0; unit < MAX_DRIVES; ++unit) {
855 ide_drive_t *drive = &hwif->drives[unit];
856
857 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
858 drive->id[ATA_ID_DWORD_IO])
859 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
860 else
861 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
862 }
863 }
864
865 /*
866 * save_match() is used to simplify logic in init_irq() below.
867 *
868 * A loophole here is that we may not know about a particular
869 * hwif's irq until after that hwif is actually probed/initialized..
870 * This could be a problem for the case where an hwif is on a
871 * dual interface that requires serialization (eg. cmd640) and another
872 * hwif using one of the same irqs is initialized beforehand.
873 *
874 * This routine detects and reports such situations, but does not fix them.
875 */
876 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
877 {
878 ide_hwif_t *m = *match;
879
880 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
881 if (!new->hwgroup)
882 return;
883 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
884 hwif->name, new->name, m->name);
885 }
886 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
887 *match = new;
888 }
889
890 /*
891 * init request queue
892 */
893 static int ide_init_queue(ide_drive_t *drive)
894 {
895 struct request_queue *q;
896 ide_hwif_t *hwif = HWIF(drive);
897 int max_sectors = 256;
898 int max_sg_entries = PRD_ENTRIES;
899
900 /*
901 * Our default set up assumes the normal IDE case,
902 * that is 64K segmenting, standard PRD setup
903 * and LBA28. Some drivers then impose their own
904 * limits and LBA48 we could raise it but as yet
905 * do not.
906 */
907
908 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
909 if (!q)
910 return 1;
911
912 q->queuedata = drive;
913 blk_queue_segment_boundary(q, 0xffff);
914
915 if (hwif->rqsize < max_sectors)
916 max_sectors = hwif->rqsize;
917 blk_queue_max_sectors(q, max_sectors);
918
919 #ifdef CONFIG_PCI
920 /* When we have an IOMMU, we may have a problem where pci_map_sg()
921 * creates segments that don't completely match our boundary
922 * requirements and thus need to be broken up again. Because it
923 * doesn't align properly either, we may actually have to break up
924 * to more segments than what was we got in the first place, a max
925 * worst case is twice as many.
926 * This will be fixed once we teach pci_map_sg() about our boundary
927 * requirements, hopefully soon. *FIXME*
928 */
929 if (!PCI_DMA_BUS_IS_PHYS)
930 max_sg_entries >>= 1;
931 #endif /* CONFIG_PCI */
932
933 blk_queue_max_hw_segments(q, max_sg_entries);
934 blk_queue_max_phys_segments(q, max_sg_entries);
935
936 /* assign drive queue */
937 drive->queue = q;
938
939 /* needs drive->queue to be set */
940 ide_toggle_bounce(drive, 1);
941
942 return 0;
943 }
944
945 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
946 {
947 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
948
949 spin_lock_irq(&ide_lock);
950 if (!hwgroup->drive) {
951 /* first drive for hwgroup. */
952 drive->next = drive;
953 hwgroup->drive = drive;
954 hwgroup->hwif = HWIF(hwgroup->drive);
955 } else {
956 drive->next = hwgroup->drive->next;
957 hwgroup->drive->next = drive;
958 }
959 spin_unlock_irq(&ide_lock);
960 }
961
962 /*
963 * For any present drive:
964 * - allocate the block device queue
965 * - link drive into the hwgroup
966 */
967 static int ide_port_setup_devices(ide_hwif_t *hwif)
968 {
969 int i, j = 0;
970
971 mutex_lock(&ide_cfg_mtx);
972 for (i = 0; i < MAX_DRIVES; i++) {
973 ide_drive_t *drive = &hwif->drives[i];
974
975 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
976 continue;
977
978 if (ide_init_queue(drive)) {
979 printk(KERN_ERR "ide: failed to init %s\n",
980 drive->name);
981 kfree(drive->id);
982 drive->id = NULL;
983 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
984 continue;
985 }
986
987 j++;
988
989 ide_add_drive_to_hwgroup(drive);
990 }
991 mutex_unlock(&ide_cfg_mtx);
992
993 return j;
994 }
995
996 static ide_hwif_t *ide_ports[MAX_HWIFS];
997
998 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
999 {
1000 ide_hwgroup_t *hwgroup = hwif->hwgroup;
1001
1002 ide_ports[hwif->index] = NULL;
1003
1004 spin_lock_irq(&ide_lock);
1005 /*
1006 * Remove us from the hwgroup, and free
1007 * the hwgroup if we were the only member
1008 */
1009 if (hwif->next == hwif) {
1010 BUG_ON(hwgroup->hwif != hwif);
1011 kfree(hwgroup);
1012 } else {
1013 /* There is another interface in hwgroup.
1014 * Unlink us, and set hwgroup->drive and ->hwif to
1015 * something sane.
1016 */
1017 ide_hwif_t *g = hwgroup->hwif;
1018
1019 while (g->next != hwif)
1020 g = g->next;
1021 g->next = hwif->next;
1022 if (hwgroup->hwif == hwif) {
1023 /* Chose a random hwif for hwgroup->hwif.
1024 * It's guaranteed that there are no drives
1025 * left in the hwgroup.
1026 */
1027 BUG_ON(hwgroup->drive != NULL);
1028 hwgroup->hwif = g;
1029 }
1030 BUG_ON(hwgroup->hwif == hwif);
1031 }
1032 spin_unlock_irq(&ide_lock);
1033 }
1034
1035 /*
1036 * This routine sets up the irq for an ide interface, and creates a new
1037 * hwgroup for the irq/hwif if none was previously assigned.
1038 *
1039 * Much of the code is for correctly detecting/handling irq sharing
1040 * and irq serialization situations. This is somewhat complex because
1041 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1042 */
1043 static int init_irq (ide_hwif_t *hwif)
1044 {
1045 struct ide_io_ports *io_ports = &hwif->io_ports;
1046 unsigned int index;
1047 ide_hwgroup_t *hwgroup;
1048 ide_hwif_t *match = NULL;
1049
1050 mutex_lock(&ide_cfg_mtx);
1051 hwif->hwgroup = NULL;
1052
1053 /*
1054 * Group up with any other hwifs that share our irq(s).
1055 */
1056 for (index = 0; index < MAX_HWIFS; index++) {
1057 ide_hwif_t *h = ide_ports[index];
1058
1059 if (h && h->hwgroup) { /* scan only initialized ports */
1060 if (hwif->irq == h->irq) {
1061 hwif->sharing_irq = h->sharing_irq = 1;
1062 if (hwif->chipset != ide_pci ||
1063 h->chipset != ide_pci) {
1064 save_match(hwif, h, &match);
1065 }
1066 }
1067 if (hwif->serialized) {
1068 if (hwif->mate && hwif->mate->irq == h->irq)
1069 save_match(hwif, h, &match);
1070 }
1071 if (h->serialized) {
1072 if (h->mate && hwif->irq == h->mate->irq)
1073 save_match(hwif, h, &match);
1074 }
1075 }
1076 }
1077
1078 /*
1079 * If we are still without a hwgroup, then form a new one
1080 */
1081 if (match) {
1082 hwgroup = match->hwgroup;
1083 hwif->hwgroup = hwgroup;
1084 /*
1085 * Link us into the hwgroup.
1086 * This must be done early, do ensure that unexpected_intr
1087 * can find the hwif and prevent irq storms.
1088 * No drives are attached to the new hwif, choose_drive
1089 * can't do anything stupid (yet).
1090 * Add ourself as the 2nd entry to the hwgroup->hwif
1091 * linked list, the first entry is the hwif that owns
1092 * hwgroup->handler - do not change that.
1093 */
1094 spin_lock_irq(&ide_lock);
1095 hwif->next = hwgroup->hwif->next;
1096 hwgroup->hwif->next = hwif;
1097 BUG_ON(hwif->next == hwif);
1098 spin_unlock_irq(&ide_lock);
1099 } else {
1100 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1101 hwif_to_node(hwif));
1102 if (hwgroup == NULL)
1103 goto out_up;
1104
1105 hwif->hwgroup = hwgroup;
1106 hwgroup->hwif = hwif->next = hwif;
1107
1108 init_timer(&hwgroup->timer);
1109 hwgroup->timer.function = &ide_timer_expiry;
1110 hwgroup->timer.data = (unsigned long) hwgroup;
1111 }
1112
1113 ide_ports[hwif->index] = hwif;
1114
1115 /*
1116 * Allocate the irq, if not already obtained for another hwif
1117 */
1118 if (!match || match->irq != hwif->irq) {
1119 int sa = 0;
1120 #if defined(__mc68000__)
1121 sa = IRQF_SHARED;
1122 #endif /* __mc68000__ */
1123
1124 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1125 hwif->chipset == ide_ali14xx)
1126 sa = IRQF_SHARED;
1127
1128 if (io_ports->ctl_addr)
1129 hwif->tp_ops->set_irq(hwif, 1);
1130
1131 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1132 goto out_unlink;
1133 }
1134
1135 if (!hwif->rqsize) {
1136 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1137 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1138 hwif->rqsize = 256;
1139 else
1140 hwif->rqsize = 65536;
1141 }
1142
1143 #if !defined(__mc68000__)
1144 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1145 io_ports->data_addr, io_ports->status_addr,
1146 io_ports->ctl_addr, hwif->irq);
1147 #else
1148 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1149 io_ports->data_addr, hwif->irq);
1150 #endif /* __mc68000__ */
1151 if (match)
1152 printk(KERN_CONT " (%sed with %s)",
1153 hwif->sharing_irq ? "shar" : "serializ", match->name);
1154 printk(KERN_CONT "\n");
1155
1156 mutex_unlock(&ide_cfg_mtx);
1157 return 0;
1158 out_unlink:
1159 ide_remove_port_from_hwgroup(hwif);
1160 out_up:
1161 mutex_unlock(&ide_cfg_mtx);
1162 return 1;
1163 }
1164
1165 static int ata_lock(dev_t dev, void *data)
1166 {
1167 /* FIXME: we want to pin hwif down */
1168 return 0;
1169 }
1170
1171 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1172 {
1173 ide_hwif_t *hwif = data;
1174 int unit = *part >> PARTN_BITS;
1175 ide_drive_t *drive = &hwif->drives[unit];
1176
1177 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1178 return NULL;
1179
1180 if (drive->media == ide_disk)
1181 request_module("ide-disk");
1182 if (drive->dev_flags & IDE_DFLAG_SCSI)
1183 request_module("ide-scsi");
1184 if (drive->media == ide_cdrom || drive->media == ide_optical)
1185 request_module("ide-cd");
1186 if (drive->media == ide_tape)
1187 request_module("ide-tape");
1188 if (drive->media == ide_floppy)
1189 request_module("ide-floppy");
1190
1191 return NULL;
1192 }
1193
1194 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1195 {
1196 struct gendisk *p = data;
1197 *part &= (1 << PARTN_BITS) - 1;
1198 return &disk_to_dev(p)->kobj;
1199 }
1200
1201 static int exact_lock(dev_t dev, void *data)
1202 {
1203 struct gendisk *p = data;
1204
1205 if (!get_disk(p))
1206 return -1;
1207 return 0;
1208 }
1209
1210 void ide_register_region(struct gendisk *disk)
1211 {
1212 blk_register_region(MKDEV(disk->major, disk->first_minor),
1213 disk->minors, NULL, exact_match, exact_lock, disk);
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_register_region);
1217
1218 void ide_unregister_region(struct gendisk *disk)
1219 {
1220 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1221 disk->minors);
1222 }
1223
1224 EXPORT_SYMBOL_GPL(ide_unregister_region);
1225
1226 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1227 {
1228 ide_hwif_t *hwif = drive->hwif;
1229 unsigned int unit = drive->dn & 1;
1230
1231 disk->major = hwif->major;
1232 disk->first_minor = unit << PARTN_BITS;
1233 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1234 disk->queue = drive->queue;
1235 }
1236
1237 EXPORT_SYMBOL_GPL(ide_init_disk);
1238
1239 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1240 {
1241 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1242
1243 if (drive == drive->next) {
1244 /* special case: last drive from hwgroup. */
1245 BUG_ON(hwgroup->drive != drive);
1246 hwgroup->drive = NULL;
1247 } else {
1248 ide_drive_t *walk;
1249
1250 walk = hwgroup->drive;
1251 while (walk->next != drive)
1252 walk = walk->next;
1253 walk->next = drive->next;
1254 if (hwgroup->drive == drive) {
1255 hwgroup->drive = drive->next;
1256 hwgroup->hwif = hwgroup->drive->hwif;
1257 }
1258 }
1259 BUG_ON(hwgroup->drive == drive);
1260 }
1261
1262 static void drive_release_dev (struct device *dev)
1263 {
1264 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1265
1266 ide_proc_unregister_device(drive);
1267
1268 spin_lock_irq(&ide_lock);
1269 ide_remove_drive_from_hwgroup(drive);
1270 kfree(drive->id);
1271 drive->id = NULL;
1272 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1273 /* Messed up locking ... */
1274 spin_unlock_irq(&ide_lock);
1275 blk_cleanup_queue(drive->queue);
1276 spin_lock_irq(&ide_lock);
1277 drive->queue = NULL;
1278 spin_unlock_irq(&ide_lock);
1279
1280 complete(&drive->gendev_rel_comp);
1281 }
1282
1283 static int hwif_init(ide_hwif_t *hwif)
1284 {
1285 int old_irq;
1286
1287 if (!hwif->irq) {
1288 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1289 if (!hwif->irq) {
1290 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1291 return 0;
1292 }
1293 }
1294
1295 if (register_blkdev(hwif->major, hwif->name))
1296 return 0;
1297
1298 if (!hwif->sg_max_nents)
1299 hwif->sg_max_nents = PRD_ENTRIES;
1300
1301 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1302 GFP_KERNEL);
1303 if (!hwif->sg_table) {
1304 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1305 goto out;
1306 }
1307
1308 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1309
1310 if (init_irq(hwif) == 0)
1311 goto done;
1312
1313 old_irq = hwif->irq;
1314 /*
1315 * It failed to initialise. Find the default IRQ for
1316 * this port and try that.
1317 */
1318 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1319 if (!hwif->irq) {
1320 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1321 hwif->name, old_irq);
1322 goto out;
1323 }
1324 if (init_irq(hwif)) {
1325 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1326 hwif->name, old_irq, hwif->irq);
1327 goto out;
1328 }
1329 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1330 hwif->name, hwif->irq);
1331
1332 done:
1333 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1334 THIS_MODULE, ata_probe, ata_lock, hwif);
1335 return 1;
1336
1337 out:
1338 unregister_blkdev(hwif->major, hwif->name);
1339 return 0;
1340 }
1341
1342 static void hwif_register_devices(ide_hwif_t *hwif)
1343 {
1344 unsigned int i;
1345
1346 for (i = 0; i < MAX_DRIVES; i++) {
1347 ide_drive_t *drive = &hwif->drives[i];
1348 struct device *dev = &drive->gendev;
1349 int ret;
1350
1351 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1352 continue;
1353
1354 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1355 dev->parent = &hwif->gendev;
1356 dev->bus = &ide_bus_type;
1357 dev->driver_data = drive;
1358 dev->release = drive_release_dev;
1359
1360 ret = device_register(dev);
1361 if (ret < 0)
1362 printk(KERN_WARNING "IDE: %s: device_register error: "
1363 "%d\n", __func__, ret);
1364 }
1365 }
1366
1367 static void ide_port_init_devices(ide_hwif_t *hwif)
1368 {
1369 const struct ide_port_ops *port_ops = hwif->port_ops;
1370 int i;
1371
1372 for (i = 0; i < MAX_DRIVES; i++) {
1373 ide_drive_t *drive = &hwif->drives[i];
1374
1375 drive->dn = i + hwif->channel * 2;
1376
1377 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1378 drive->io_32bit = 1;
1379 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1380 drive->dev_flags |= IDE_DFLAG_UNMASK;
1381 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1382 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1383
1384 if (port_ops && port_ops->init_dev)
1385 port_ops->init_dev(drive);
1386 }
1387 }
1388
1389 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1390 const struct ide_port_info *d)
1391 {
1392 hwif->channel = port;
1393
1394 if (d->chipset)
1395 hwif->chipset = d->chipset;
1396
1397 if (d->init_iops)
1398 d->init_iops(hwif);
1399
1400 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1401 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1402 hwif->irq = port ? 15 : 14;
1403
1404 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1405 hwif->host_flags |= d->host_flags;
1406 hwif->pio_mask = d->pio_mask;
1407
1408 if (d->tp_ops)
1409 hwif->tp_ops = d->tp_ops;
1410
1411 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1412 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1413 hwif->port_ops = d->port_ops;
1414
1415 hwif->swdma_mask = d->swdma_mask;
1416 hwif->mwdma_mask = d->mwdma_mask;
1417 hwif->ultra_mask = d->udma_mask;
1418
1419 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1420 int rc;
1421
1422 if (d->init_dma)
1423 rc = d->init_dma(hwif, d);
1424 else
1425 rc = ide_hwif_setup_dma(hwif, d);
1426
1427 if (rc < 0) {
1428 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1429 hwif->dma_base = 0;
1430 hwif->swdma_mask = 0;
1431 hwif->mwdma_mask = 0;
1432 hwif->ultra_mask = 0;
1433 } else if (d->dma_ops)
1434 hwif->dma_ops = d->dma_ops;
1435 }
1436
1437 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1438 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1439 if (hwif->mate)
1440 hwif->mate->serialized = hwif->serialized = 1;
1441 }
1442
1443 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1444 hwif->rqsize = 256;
1445
1446 /* call chipset specific routine for each enabled port */
1447 if (d->init_hwif)
1448 d->init_hwif(hwif);
1449 }
1450
1451 static void ide_port_cable_detect(ide_hwif_t *hwif)
1452 {
1453 const struct ide_port_ops *port_ops = hwif->port_ops;
1454
1455 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1456 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1457 hwif->cbl = port_ops->cable_detect(hwif);
1458 }
1459 }
1460
1461 static ssize_t store_delete_devices(struct device *portdev,
1462 struct device_attribute *attr,
1463 const char *buf, size_t n)
1464 {
1465 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1466
1467 if (strncmp(buf, "1", n))
1468 return -EINVAL;
1469
1470 ide_port_unregister_devices(hwif);
1471
1472 return n;
1473 };
1474
1475 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1476
1477 static ssize_t store_scan(struct device *portdev,
1478 struct device_attribute *attr,
1479 const char *buf, size_t n)
1480 {
1481 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1482
1483 if (strncmp(buf, "1", n))
1484 return -EINVAL;
1485
1486 ide_port_unregister_devices(hwif);
1487 ide_port_scan(hwif);
1488
1489 return n;
1490 };
1491
1492 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1493
1494 static struct device_attribute *ide_port_attrs[] = {
1495 &dev_attr_delete_devices,
1496 &dev_attr_scan,
1497 NULL
1498 };
1499
1500 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1501 {
1502 int i, uninitialized_var(rc);
1503
1504 for (i = 0; ide_port_attrs[i]; i++) {
1505 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1506 if (rc)
1507 break;
1508 }
1509
1510 return rc;
1511 }
1512
1513 static unsigned int ide_indexes;
1514
1515 /**
1516 * ide_find_port_slot - find free port slot
1517 * @d: IDE port info
1518 *
1519 * Return the new port slot index or -ENOENT if we are out of free slots.
1520 */
1521
1522 static int ide_find_port_slot(const struct ide_port_info *d)
1523 {
1524 int idx = -ENOENT;
1525 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1526 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1527
1528 /*
1529 * Claim an unassigned slot.
1530 *
1531 * Give preference to claiming other slots before claiming ide0/ide1,
1532 * just in case there's another interface yet-to-be-scanned
1533 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1534 *
1535 * Unless there is a bootable card that does not use the standard
1536 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1537 */
1538 mutex_lock(&ide_cfg_mtx);
1539 if (bootable) {
1540 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1541 idx = ffz(ide_indexes | i);
1542 } else {
1543 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1544 idx = ffz(ide_indexes | 3);
1545 else if ((ide_indexes & 3) != 3)
1546 idx = ffz(ide_indexes);
1547 }
1548 if (idx >= 0)
1549 ide_indexes |= (1 << idx);
1550 mutex_unlock(&ide_cfg_mtx);
1551
1552 return idx;
1553 }
1554
1555 static void ide_free_port_slot(int idx)
1556 {
1557 mutex_lock(&ide_cfg_mtx);
1558 ide_indexes &= ~(1 << idx);
1559 mutex_unlock(&ide_cfg_mtx);
1560 }
1561
1562 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1563 {
1564 struct ide_host *host;
1565 int i;
1566
1567 host = kzalloc(sizeof(*host), GFP_KERNEL);
1568 if (host == NULL)
1569 return NULL;
1570
1571 for (i = 0; i < MAX_HOST_PORTS; i++) {
1572 ide_hwif_t *hwif;
1573 int idx;
1574
1575 if (hws[i] == NULL)
1576 continue;
1577
1578 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1579 if (hwif == NULL)
1580 continue;
1581
1582 idx = ide_find_port_slot(d);
1583 if (idx < 0) {
1584 printk(KERN_ERR "%s: no free slot for interface\n",
1585 d ? d->name : "ide");
1586 kfree(hwif);
1587 continue;
1588 }
1589
1590 ide_init_port_data(hwif, idx);
1591
1592 hwif->host = host;
1593
1594 host->ports[i] = hwif;
1595 host->n_ports++;
1596 }
1597
1598 if (host->n_ports == 0) {
1599 kfree(host);
1600 return NULL;
1601 }
1602
1603 if (hws[0])
1604 host->dev[0] = hws[0]->dev;
1605
1606 if (d) {
1607 host->init_chipset = d->init_chipset;
1608 host->host_flags = d->host_flags;
1609 }
1610
1611 return host;
1612 }
1613 EXPORT_SYMBOL_GPL(ide_host_alloc);
1614
1615 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1616 hw_regs_t **hws)
1617 {
1618 ide_hwif_t *hwif, *mate = NULL;
1619 int i, j = 0;
1620
1621 for (i = 0; i < MAX_HOST_PORTS; i++) {
1622 hwif = host->ports[i];
1623
1624 if (hwif == NULL) {
1625 mate = NULL;
1626 continue;
1627 }
1628
1629 ide_init_port_hw(hwif, hws[i]);
1630 ide_port_apply_params(hwif);
1631
1632 if (d == NULL) {
1633 mate = NULL;
1634 } else {
1635 if ((i & 1) && mate) {
1636 hwif->mate = mate;
1637 mate->mate = hwif;
1638 }
1639
1640 mate = (i & 1) ? NULL : hwif;
1641
1642 ide_init_port(hwif, i & 1, d);
1643 ide_port_cable_detect(hwif);
1644 }
1645
1646 ide_port_init_devices(hwif);
1647 }
1648
1649 for (i = 0; i < MAX_HOST_PORTS; i++) {
1650 hwif = host->ports[i];
1651
1652 if (hwif == NULL)
1653 continue;
1654
1655 if (ide_probe_port(hwif) == 0)
1656 hwif->present = 1;
1657
1658 if (hwif->chipset != ide_4drives || !hwif->mate ||
1659 !hwif->mate->present)
1660 ide_register_port(hwif);
1661
1662 if (hwif->present)
1663 ide_port_tune_devices(hwif);
1664 }
1665
1666 for (i = 0; i < MAX_HOST_PORTS; i++) {
1667 hwif = host->ports[i];
1668
1669 if (hwif == NULL)
1670 continue;
1671
1672 if (hwif_init(hwif) == 0) {
1673 printk(KERN_INFO "%s: failed to initialize IDE "
1674 "interface\n", hwif->name);
1675 hwif->present = 0;
1676 continue;
1677 }
1678
1679 if (hwif->present)
1680 if (ide_port_setup_devices(hwif) == 0) {
1681 hwif->present = 0;
1682 continue;
1683 }
1684
1685 j++;
1686
1687 ide_acpi_init(hwif);
1688
1689 if (hwif->present)
1690 ide_acpi_port_init_devices(hwif);
1691 }
1692
1693 for (i = 0; i < MAX_HOST_PORTS; i++) {
1694 hwif = host->ports[i];
1695
1696 if (hwif == NULL)
1697 continue;
1698
1699 if (hwif->chipset == ide_unknown)
1700 hwif->chipset = ide_generic;
1701
1702 if (hwif->present)
1703 hwif_register_devices(hwif);
1704 }
1705
1706 for (i = 0; i < MAX_HOST_PORTS; i++) {
1707 hwif = host->ports[i];
1708
1709 if (hwif == NULL)
1710 continue;
1711
1712 ide_sysfs_register_port(hwif);
1713 ide_proc_register_port(hwif);
1714
1715 if (hwif->present)
1716 ide_proc_port_register_devices(hwif);
1717 }
1718
1719 return j ? 0 : -1;
1720 }
1721 EXPORT_SYMBOL_GPL(ide_host_register);
1722
1723 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1724 struct ide_host **hostp)
1725 {
1726 struct ide_host *host;
1727 int rc;
1728
1729 host = ide_host_alloc(d, hws);
1730 if (host == NULL)
1731 return -ENOMEM;
1732
1733 rc = ide_host_register(host, d, hws);
1734 if (rc) {
1735 ide_host_free(host);
1736 return rc;
1737 }
1738
1739 if (hostp)
1740 *hostp = host;
1741
1742 return 0;
1743 }
1744 EXPORT_SYMBOL_GPL(ide_host_add);
1745
1746 void ide_host_free(struct ide_host *host)
1747 {
1748 ide_hwif_t *hwif;
1749 int i;
1750
1751 for (i = 0; i < MAX_HOST_PORTS; i++) {
1752 hwif = host->ports[i];
1753
1754 if (hwif == NULL)
1755 continue;
1756
1757 ide_free_port_slot(hwif->index);
1758 kfree(hwif);
1759 }
1760
1761 kfree(host);
1762 }
1763 EXPORT_SYMBOL_GPL(ide_host_free);
1764
1765 void ide_host_remove(struct ide_host *host)
1766 {
1767 int i;
1768
1769 for (i = 0; i < MAX_HOST_PORTS; i++) {
1770 if (host->ports[i])
1771 ide_unregister(host->ports[i]);
1772 }
1773
1774 ide_host_free(host);
1775 }
1776 EXPORT_SYMBOL_GPL(ide_host_remove);
1777
1778 void ide_port_scan(ide_hwif_t *hwif)
1779 {
1780 ide_port_apply_params(hwif);
1781 ide_port_cable_detect(hwif);
1782 ide_port_init_devices(hwif);
1783
1784 if (ide_probe_port(hwif) < 0)
1785 return;
1786
1787 hwif->present = 1;
1788
1789 ide_port_tune_devices(hwif);
1790 ide_acpi_port_init_devices(hwif);
1791 ide_port_setup_devices(hwif);
1792 hwif_register_devices(hwif);
1793 ide_proc_port_register_devices(hwif);
1794 }
1795 EXPORT_SYMBOL_GPL(ide_port_scan);
1796
1797 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1798 u8 port_no, const struct ide_port_info *d,
1799 unsigned long config)
1800 {
1801 unsigned long base, ctl;
1802 int irq;
1803
1804 if (port_no == 0) {
1805 base = 0x1f0;
1806 ctl = 0x3f6;
1807 irq = 14;
1808 } else {
1809 base = 0x170;
1810 ctl = 0x376;
1811 irq = 15;
1812 }
1813
1814 if (!request_region(base, 8, d->name)) {
1815 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1816 d->name, base, base + 7);
1817 return;
1818 }
1819
1820 if (!request_region(ctl, 1, d->name)) {
1821 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1822 d->name, ctl);
1823 release_region(base, 8);
1824 return;
1825 }
1826
1827 ide_std_init_ports(hw, base, ctl);
1828 hw->irq = irq;
1829 hw->chipset = d->chipset;
1830 hw->config = config;
1831
1832 hws[port_no] = hw;
1833 }
1834
1835 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1836 {
1837 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1838
1839 memset(&hw, 0, sizeof(hw));
1840
1841 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1842 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1843 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1844
1845 if (hws[0] == NULL && hws[1] == NULL &&
1846 (d->host_flags & IDE_HFLAG_SINGLE))
1847 return -ENOENT;
1848
1849 return ide_host_add(d, hws, NULL);
1850 }
1851 EXPORT_SYMBOL_GPL(ide_legacy_device_add);
Support for the Chinese Samsung S3C2440 based development boards