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ALSA: hda - ELD proc interface write updates
[linux-2.6/mini2440.git] / drivers / ide / ide-probe.c
bloba51a30e9eab3c1e1712fc3924fa934113acef10a
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 drive->id->cyls = drive->cyl;
54 drive->id->heads = drive->head;
55 drive->id->sectors = drive->sect;
56 drive->id->cur_cyls = drive->cyl;
57 drive->id->cur_heads = drive->head;
58 drive->id->cur_sectors = drive->sect;
59 }
60
61 static void ide_disk_init_chs(ide_drive_t *drive)
62 {
63 struct hd_driveid *id = drive->id;
64
65 /* Extract geometry if we did not already have one for the drive */
66 if (!drive->cyl || !drive->head || !drive->sect) {
67 drive->cyl = drive->bios_cyl = id->cyls;
68 drive->head = drive->bios_head = id->heads;
69 drive->sect = drive->bios_sect = id->sectors;
70 }
71
72 /* Handle logical geometry translation by the drive */
73 if ((id->field_valid & 1) && id->cur_cyls &&
74 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
75 drive->cyl = id->cur_cyls;
76 drive->head = id->cur_heads;
77 drive->sect = id->cur_sectors;
78 }
79
80 /* Use physical geometry if what we have still makes no sense */
81 if (drive->head > 16 && id->heads && id->heads <= 16) {
82 drive->cyl = id->cyls;
83 drive->head = id->heads;
84 drive->sect = id->sectors;
85 }
86 }
87
88 static void ide_disk_init_mult_count(ide_drive_t *drive)
89 {
90 struct hd_driveid *id = drive->id;
91
92 drive->mult_count = 0;
93 if (id->max_multsect) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
96 id->multsect_valid = id->multsect ? 1 : 0;
97 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
98 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
99 #else /* original, pre IDE-NFG, per request of AC */
100 drive->mult_req = 0;
101 if (drive->mult_req > id->max_multsect)
102 drive->mult_req = id->max_multsect;
103 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
104 drive->special.b.set_multmode = 1;
105 #endif
106 }
107 }
108
109 /**
110 * do_identify - identify a drive
111 * @drive: drive to identify
112 * @cmd: command used
113 *
114 * Called when we have issued a drive identify command to
115 * read and parse the results. This function is run with
116 * interrupts disabled.
117 */
118
119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
120 {
121 ide_hwif_t *hwif = HWIF(drive);
122 int bswap = 1;
123 struct hd_driveid *id;
124
125 id = drive->id;
126 /* read 512 bytes of id info */
127 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
128
129 drive->id_read = 1;
130 local_irq_enable();
131 #ifdef DEBUG
132 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
133 ide_dump_identify((u8 *)id);
134 #endif
135 ide_fix_driveid(id);
136
137 /*
138 * WIN_IDENTIFY returns little-endian info,
139 * WIN_PIDENTIFY *usually* returns little-endian info.
140 */
141 if (cmd == WIN_PIDENTIFY) {
142 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
143 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
144 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
145 /* Vertos drives may still be weird */
146 bswap ^= 1;
147 }
148 ide_fixstring(id->model, sizeof(id->model), bswap);
149 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
150 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
151
152 /* we depend on this a lot! */
153 id->model[sizeof(id->model)-1] = '\0';
154
155 if (strstr(id->model, "E X A B Y T E N E S T"))
156 goto err_misc;
157
158 printk(KERN_INFO "%s: %s, ", drive->name, id->model);
159
160 drive->present = 1;
161 drive->dead = 0;
162
163 /*
164 * Check for an ATAPI device
165 */
166 if (cmd == WIN_PIDENTIFY) {
167 u8 type = (id->config >> 8) & 0x1f;
168
169 printk(KERN_CONT "ATAPI ");
170 switch (type) {
171 case ide_floppy:
172 if (!strstr(id->model, "CD-ROM")) {
173 if (!strstr(id->model, "oppy") &&
174 !strstr(id->model, "poyp") &&
175 !strstr(id->model, "ZIP"))
176 printk(KERN_CONT "cdrom or floppy?, assuming ");
177 if (drive->media != ide_cdrom) {
178 printk(KERN_CONT "FLOPPY");
179 drive->removable = 1;
180 break;
181 }
182 }
183 /* Early cdrom models used zero */
184 type = ide_cdrom;
185 case ide_cdrom:
186 drive->removable = 1;
187 #ifdef CONFIG_PPC
188 /* kludge for Apple PowerBook internal zip */
189 if (!strstr(id->model, "CD-ROM") &&
190 strstr(id->model, "ZIP")) {
191 printk(KERN_CONT "FLOPPY");
192 type = ide_floppy;
193 break;
194 }
195 #endif
196 printk(KERN_CONT "CD/DVD-ROM");
197 break;
198 case ide_tape:
199 printk(KERN_CONT "TAPE");
200 break;
201 case ide_optical:
202 printk(KERN_CONT "OPTICAL");
203 drive->removable = 1;
204 break;
205 default:
206 printk(KERN_CONT "UNKNOWN (type %d)", type);
207 break;
208 }
209 printk(KERN_CONT " drive\n");
210 drive->media = type;
211 /* an ATAPI device ignores DRDY */
212 drive->ready_stat = 0;
213 return;
214 }
215
216 /*
217 * Not an ATAPI device: looks like a "regular" hard disk
218 */
219
220 /*
221 * 0x848a = CompactFlash device
222 * These are *not* removable in Linux definition of the term
223 */
224
225 if ((id->config != 0x848a) && (id->config & (1<<7)))
226 drive->removable = 1;
227
228 drive->media = ide_disk;
229
230 printk(KERN_CONT "%s DISK drive\n",
231 (id->config == 0x848a) ? "CFA" : "ATA");
232
233 return;
234
235 err_misc:
236 kfree(id);
237 drive->present = 0;
238 return;
239 }
240
241 /**
242 * actual_try_to_identify - send ata/atapi identify
243 * @drive: drive to identify
244 * @cmd: command to use
245 *
246 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
247 * and waits for a response. It also monitors irqs while this is
248 * happening, in hope of automatically determining which one is
249 * being used by the interface.
250 *
251 * Returns: 0 device was identified
252 * 1 device timed-out (no response to identify request)
253 * 2 device aborted the command (refused to identify itself)
254 */
255
256 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
257 {
258 ide_hwif_t *hwif = HWIF(drive);
259 struct ide_io_ports *io_ports = &hwif->io_ports;
260 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
261 int use_altstatus = 0, rc;
262 unsigned long timeout;
263 u8 s = 0, a = 0;
264
265 /* take a deep breath */
266 msleep(50);
267
268 if (io_ports->ctl_addr) {
269 a = tp_ops->read_altstatus(hwif);
270 s = tp_ops->read_status(hwif);
271 if ((a ^ s) & ~INDEX_STAT)
272 /* ancient Seagate drives, broken interfaces */
273 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
274 "instead of ALTSTATUS(0x%02x)\n",
275 drive->name, s, a);
276 else
277 /* use non-intrusive polling */
278 use_altstatus = 1;
279 }
280
281 /* set features register for atapi
282 * identify command to be sure of reply
283 */
284 if (cmd == WIN_PIDENTIFY) {
285 ide_task_t task;
286
287 memset(&task, 0, sizeof(task));
288 /* disable DMA & overlap */
289 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
290
291 tp_ops->tf_load(drive, &task);
292 }
293
294 /* ask drive for ID */
295 tp_ops->exec_command(hwif, cmd);
296
297 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298 timeout += jiffies;
299 do {
300 if (time_after(jiffies, timeout)) {
301 /* drive timed-out */
302 return 1;
303 }
304 /* give drive a breather */
305 msleep(50);
306 s = use_altstatus ? tp_ops->read_altstatus(hwif)
307 : tp_ops->read_status(hwif);
308 } while (s & BUSY_STAT);
309
310 /* wait for IRQ and DRQ_STAT */
311 msleep(50);
312 s = tp_ops->read_status(hwif);
313
314 if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
315 unsigned long flags;
316
317 /* local CPU only; some systems need this */
318 local_irq_save(flags);
319 /* drive returned ID */
320 do_identify(drive, cmd);
321 /* drive responded with ID */
322 rc = 0;
323 /* clear drive IRQ */
324 (void)tp_ops->read_status(hwif);
325 local_irq_restore(flags);
326 } else {
327 /* drive refused ID */
328 rc = 2;
329 }
330 return rc;
331 }
332
333 /**
334 * try_to_identify - try to identify a drive
335 * @drive: drive to probe
336 * @cmd: command to use
337 *
338 * Issue the identify command and then do IRQ probing to
339 * complete the identification when needed by finding the
340 * IRQ the drive is attached to
341 */
342
343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
344 {
345 ide_hwif_t *hwif = HWIF(drive);
346 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
347 int retval;
348 int autoprobe = 0;
349 unsigned long cookie = 0;
350
351 /*
352 * Disable device irq unless we need to
353 * probe for it. Otherwise we'll get spurious
354 * interrupts during the identify-phase that
355 * the irq handler isn't expecting.
356 */
357 if (hwif->io_ports.ctl_addr) {
358 if (!hwif->irq) {
359 autoprobe = 1;
360 cookie = probe_irq_on();
361 }
362 tp_ops->set_irq(hwif, autoprobe);
363 }
364
365 retval = actual_try_to_identify(drive, cmd);
366
367 if (autoprobe) {
368 int irq;
369
370 tp_ops->set_irq(hwif, 0);
371 /* clear drive IRQ */
372 (void)tp_ops->read_status(hwif);
373 udelay(5);
374 irq = probe_irq_off(cookie);
375 if (!hwif->irq) {
376 if (irq > 0) {
377 hwif->irq = irq;
378 } else {
379 /* Mmmm.. multiple IRQs..
380 * don't know which was ours
381 */
382 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
383 drive->name, cookie);
384 }
385 }
386 }
387 return retval;
388 }
389
390 static int ide_busy_sleep(ide_hwif_t *hwif)
391 {
392 unsigned long timeout = jiffies + WAIT_WORSTCASE;
393 u8 stat;
394
395 do {
396 msleep(50);
397 stat = hwif->tp_ops->read_status(hwif);
398 if ((stat & BUSY_STAT) == 0)
399 return 0;
400 } while (time_before(jiffies, timeout));
401
402 return 1;
403 }
404
405 static u8 ide_read_device(ide_drive_t *drive)
406 {
407 ide_task_t task;
408
409 memset(&task, 0, sizeof(task));
410 task.tf_flags = IDE_TFLAG_IN_DEVICE;
411
412 drive->hwif->tp_ops->tf_read(drive, &task);
413
414 return task.tf.device;
415 }
416
417 /**
418 * do_probe - probe an IDE device
419 * @drive: drive to probe
420 * @cmd: command to use
421 *
422 * do_probe() has the difficult job of finding a drive if it exists,
423 * without getting hung up if it doesn't exist, without trampling on
424 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
425 *
426 * If a drive is "known" to exist (from CMOS or kernel parameters),
427 * but does not respond right away, the probe will "hang in there"
428 * for the maximum wait time (about 30 seconds), otherwise it will
429 * exit much more quickly.
430 *
431 * Returns: 0 device was identified
432 * 1 device timed-out (no response to identify request)
433 * 2 device aborted the command (refused to identify itself)
434 * 3 bad status from device (possible for ATAPI drives)
435 * 4 probe was not attempted because failure was obvious
436 */
437
438 static int do_probe (ide_drive_t *drive, u8 cmd)
439 {
440 ide_hwif_t *hwif = HWIF(drive);
441 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
442 int rc;
443 u8 stat;
444
445 if (drive->present) {
446 /* avoid waiting for inappropriate probes */
447 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
448 return 4;
449 }
450 #ifdef DEBUG
451 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
452 drive->name, drive->present, drive->media,
453 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
454 #endif
455
456 /* needed for some systems
457 * (e.g. crw9624 as drive0 with disk as slave)
458 */
459 msleep(50);
460 SELECT_DRIVE(drive);
461 msleep(50);
462
463 if (ide_read_device(drive) != drive->select.all && !drive->present) {
464 if (drive->select.b.unit != 0) {
465 /* exit with drive0 selected */
466 SELECT_DRIVE(&hwif->drives[0]);
467 /* allow BUSY_STAT to assert & clear */
468 msleep(50);
469 }
470 /* no i/f present: mmm.. this should be a 4 -ml */
471 return 3;
472 }
473
474 stat = tp_ops->read_status(hwif);
475
476 if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
477 drive->present || cmd == WIN_PIDENTIFY) {
478 /* send cmd and wait */
479 if ((rc = try_to_identify(drive, cmd))) {
480 /* failed: try again */
481 rc = try_to_identify(drive,cmd);
482 }
483
484 stat = tp_ops->read_status(hwif);
485
486 if (stat == (BUSY_STAT | READY_STAT))
487 return 4;
488
489 if (rc == 1 && cmd == WIN_PIDENTIFY) {
490 printk(KERN_ERR "%s: no response (status = 0x%02x), "
491 "resetting drive\n", drive->name, stat);
492 msleep(50);
493 SELECT_DRIVE(drive);
494 msleep(50);
495 tp_ops->exec_command(hwif, WIN_SRST);
496 (void)ide_busy_sleep(hwif);
497 rc = try_to_identify(drive, cmd);
498 }
499
500 /* ensure drive IRQ is clear */
501 stat = tp_ops->read_status(hwif);
502
503 if (rc == 1)
504 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
505 drive->name, stat);
506 } else {
507 /* not present or maybe ATAPI */
508 rc = 3;
509 }
510 if (drive->select.b.unit != 0) {
511 /* exit with drive0 selected */
512 SELECT_DRIVE(&hwif->drives[0]);
513 msleep(50);
514 /* ensure drive irq is clear */
515 (void)tp_ops->read_status(hwif);
516 }
517 return rc;
518 }
519
520 /*
521 *
522 */
523 static void enable_nest (ide_drive_t *drive)
524 {
525 ide_hwif_t *hwif = HWIF(drive);
526 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
527 u8 stat;
528
529 printk(KERN_INFO "%s: enabling %s -- ", hwif->name, drive->id->model);
530
531 SELECT_DRIVE(drive);
532 msleep(50);
533 tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
534
535 if (ide_busy_sleep(hwif)) {
536 printk(KERN_CONT "failed (timeout)\n");
537 return;
538 }
539
540 msleep(50);
541
542 stat = tp_ops->read_status(hwif);
543
544 if (!OK_STAT(stat, 0, BAD_STAT))
545 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
546 else
547 printk(KERN_CONT "success\n");
548
549 /* if !(success||timed-out) */
550 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
551 /* look for ATAPI device */
552 (void) do_probe(drive, WIN_PIDENTIFY);
553 }
554 }
555
556 /**
557 * probe_for_drives - upper level drive probe
558 * @drive: drive to probe for
559 *
560 * probe_for_drive() tests for existence of a given drive using do_probe()
561 * and presents things to the user as needed.
562 *
563 * Returns: 0 no device was found
564 * 1 device was found (note: drive->present might
565 * still be 0)
566 */
567
568 static inline u8 probe_for_drive (ide_drive_t *drive)
569 {
570 /*
571 * In order to keep things simple we have an id
572 * block for all drives at all times. If the device
573 * is pre ATA or refuses ATA/ATAPI identify we
574 * will add faked data to this.
575 *
576 * Also note that 0 everywhere means "can't do X"
577 */
578
579 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
580 drive->id_read = 0;
581 if(drive->id == NULL)
582 {
583 printk(KERN_ERR "ide: out of memory for id data.\n");
584 return 0;
585 }
586 strcpy(drive->id->model, "UNKNOWN");
587
588 /* skip probing? */
589 if (!drive->noprobe)
590 {
591 /* if !(success||timed-out) */
592 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
593 /* look for ATAPI device */
594 (void) do_probe(drive, WIN_PIDENTIFY);
595 }
596 if (!drive->present)
597 /* drive not found */
598 return 0;
599 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
600 enable_nest(drive);
601
602 /* identification failed? */
603 if (!drive->id_read) {
604 if (drive->media == ide_disk) {
605 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
606 drive->name, drive->cyl,
607 drive->head, drive->sect);
608 } else if (drive->media == ide_cdrom) {
609 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
610 } else {
611 /* nuke it */
612 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
613 drive->present = 0;
614 }
615 }
616 /* drive was found */
617 }
618 if(!drive->present)
619 return 0;
620 /* The drive wasn't being helpful. Add generic info only */
621 if (drive->id_read == 0) {
622 generic_id(drive);
623 return 1;
624 }
625
626 if (drive->media == ide_disk) {
627 ide_disk_init_chs(drive);
628 ide_disk_init_mult_count(drive);
629 }
630
631 return drive->present;
632 }
633
634 static void hwif_release_dev(struct device *dev)
635 {
636 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
637
638 complete(&hwif->gendev_rel_comp);
639 }
640
641 static int ide_register_port(ide_hwif_t *hwif)
642 {
643 int ret;
644
645 /* register with global device tree */
646 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
647 hwif->gendev.driver_data = hwif;
648 if (hwif->gendev.parent == NULL) {
649 if (hwif->dev)
650 hwif->gendev.parent = hwif->dev;
651 else
652 /* Would like to do = &device_legacy */
653 hwif->gendev.parent = NULL;
654 }
655 hwif->gendev.release = hwif_release_dev;
656 ret = device_register(&hwif->gendev);
657 if (ret < 0) {
658 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
659 __func__, ret);
660 goto out;
661 }
662
663 hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
664 MKDEV(0, 0), hwif, hwif->name);
665 if (IS_ERR(hwif->portdev)) {
666 ret = PTR_ERR(hwif->portdev);
667 device_unregister(&hwif->gendev);
668 }
669 out:
670 return ret;
671 }
672
673 /**
674 * ide_port_wait_ready - wait for port to become ready
675 * @hwif: IDE port
676 *
677 * This is needed on some PPCs and a bunch of BIOS-less embedded
678 * platforms. Typical cases are:
679 *
680 * - The firmware hard reset the disk before booting the kernel,
681 * the drive is still doing it's poweron-reset sequence, that
682 * can take up to 30 seconds.
683 *
684 * - The firmware does nothing (or no firmware), the device is
685 * still in POST state (same as above actually).
686 *
687 * - Some CD/DVD/Writer combo drives tend to drive the bus during
688 * their reset sequence even when they are non-selected slave
689 * devices, thus preventing discovery of the main HD.
690 *
691 * Doing this wait-for-non-busy should not harm any existing
692 * configuration and fix some issues like the above.
693 *
694 * BenH.
695 *
696 * Returns 0 on success, error code (< 0) otherwise.
697 */
698
699 static int ide_port_wait_ready(ide_hwif_t *hwif)
700 {
701 int unit, rc;
702
703 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
704
705 /* Let HW settle down a bit from whatever init state we
706 * come from */
707 mdelay(2);
708
709 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
710 * I know of at least one disk who takes 31 seconds, I use 35
711 * here to be safe
712 */
713 rc = ide_wait_not_busy(hwif, 35000);
714 if (rc)
715 return rc;
716
717 /* Now make sure both master & slave are ready */
718 for (unit = 0; unit < MAX_DRIVES; unit++) {
719 ide_drive_t *drive = &hwif->drives[unit];
720
721 /* Ignore disks that we will not probe for later. */
722 if (!drive->noprobe || drive->present) {
723 SELECT_DRIVE(drive);
724 hwif->tp_ops->set_irq(hwif, 1);
725 mdelay(2);
726 rc = ide_wait_not_busy(hwif, 35000);
727 if (rc)
728 goto out;
729 } else
730 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
731 drive->name);
732 }
733 out:
734 /* Exit function with master reselected (let's be sane) */
735 if (unit)
736 SELECT_DRIVE(&hwif->drives[0]);
737
738 return rc;
739 }
740
741 /**
742 * ide_undecoded_slave - look for bad CF adapters
743 * @drive1: drive
744 *
745 * Analyse the drives on the interface and attempt to decide if we
746 * have the same drive viewed twice. This occurs with crap CF adapters
747 * and PCMCIA sometimes.
748 */
749
750 void ide_undecoded_slave(ide_drive_t *drive1)
751 {
752 ide_drive_t *drive0 = &drive1->hwif->drives[0];
753
754 if ((drive1->dn & 1) == 0 || drive0->present == 0)
755 return;
756
757 /* If the models don't match they are not the same product */
758 if (strcmp(drive0->id->model, drive1->id->model))
759 return;
760
761 /* Serial numbers do not match */
762 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
763 return;
764
765 /* No serial number, thankfully very rare for CF */
766 if (drive0->id->serial_no[0] == 0)
767 return;
768
769 /* Appears to be an IDE flash adapter with decode bugs */
770 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
771
772 drive1->present = 0;
773 }
774
775 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
776
777 static int ide_probe_port(ide_hwif_t *hwif)
778 {
779 unsigned long flags;
780 unsigned int irqd;
781 int unit, rc = -ENODEV;
782
783 BUG_ON(hwif->present);
784
785 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
786 return -EACCES;
787
788 /*
789 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
790 * we'll install our IRQ driver much later...
791 */
792 irqd = hwif->irq;
793 if (irqd)
794 disable_irq(hwif->irq);
795
796 local_irq_set(flags);
797
798 if (ide_port_wait_ready(hwif) == -EBUSY)
799 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
800
801 /*
802 * Second drive should only exist if first drive was found,
803 * but a lot of cdrom drives are configured as single slaves.
804 */
805 for (unit = 0; unit < MAX_DRIVES; ++unit) {
806 ide_drive_t *drive = &hwif->drives[unit];
807 drive->dn = (hwif->channel ? 2 : 0) + unit;
808 (void) probe_for_drive(drive);
809 if (drive->present)
810 rc = 0;
811 }
812
813 local_irq_restore(flags);
814
815 /*
816 * Use cached IRQ number. It might be (and is...) changed by probe
817 * code above
818 */
819 if (irqd)
820 enable_irq(irqd);
821
822 return rc;
823 }
824
825 static void ide_port_tune_devices(ide_hwif_t *hwif)
826 {
827 const struct ide_port_ops *port_ops = hwif->port_ops;
828 int unit;
829
830 for (unit = 0; unit < MAX_DRIVES; unit++) {
831 ide_drive_t *drive = &hwif->drives[unit];
832
833 if (drive->present && port_ops && port_ops->quirkproc)
834 port_ops->quirkproc(drive);
835 }
836
837 for (unit = 0; unit < MAX_DRIVES; ++unit) {
838 ide_drive_t *drive = &hwif->drives[unit];
839
840 if (drive->present) {
841 ide_set_max_pio(drive);
842
843 drive->nice1 = 1;
844
845 if (hwif->dma_ops)
846 ide_set_dma(drive);
847 }
848 }
849
850 for (unit = 0; unit < MAX_DRIVES; ++unit) {
851 ide_drive_t *drive = &hwif->drives[unit];
852
853 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
854 drive->no_io_32bit = 1;
855 else
856 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
857 }
858 }
859
860 #if MAX_HWIFS > 1
861 /*
862 * save_match() is used to simplify logic in init_irq() below.
863 *
864 * A loophole here is that we may not know about a particular
865 * hwif's irq until after that hwif is actually probed/initialized..
866 * This could be a problem for the case where an hwif is on a
867 * dual interface that requires serialization (eg. cmd640) and another
868 * hwif using one of the same irqs is initialized beforehand.
869 *
870 * This routine detects and reports such situations, but does not fix them.
871 */
872 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
873 {
874 ide_hwif_t *m = *match;
875
876 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
877 if (!new->hwgroup)
878 return;
879 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
880 hwif->name, new->name, m->name);
881 }
882 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
883 *match = new;
884 }
885 #endif /* MAX_HWIFS > 1 */
886
887 /*
888 * init request queue
889 */
890 static int ide_init_queue(ide_drive_t *drive)
891 {
892 struct request_queue *q;
893 ide_hwif_t *hwif = HWIF(drive);
894 int max_sectors = 256;
895 int max_sg_entries = PRD_ENTRIES;
896
897 /*
898 * Our default set up assumes the normal IDE case,
899 * that is 64K segmenting, standard PRD setup
900 * and LBA28. Some drivers then impose their own
901 * limits and LBA48 we could raise it but as yet
902 * do not.
903 */
904
905 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
906 if (!q)
907 return 1;
908
909 q->queuedata = drive;
910 blk_queue_segment_boundary(q, 0xffff);
911
912 if (hwif->rqsize < max_sectors)
913 max_sectors = hwif->rqsize;
914 blk_queue_max_sectors(q, max_sectors);
915
916 #ifdef CONFIG_PCI
917 /* When we have an IOMMU, we may have a problem where pci_map_sg()
918 * creates segments that don't completely match our boundary
919 * requirements and thus need to be broken up again. Because it
920 * doesn't align properly either, we may actually have to break up
921 * to more segments than what was we got in the first place, a max
922 * worst case is twice as many.
923 * This will be fixed once we teach pci_map_sg() about our boundary
924 * requirements, hopefully soon. *FIXME*
925 */
926 if (!PCI_DMA_BUS_IS_PHYS)
927 max_sg_entries >>= 1;
928 #endif /* CONFIG_PCI */
929
930 blk_queue_max_hw_segments(q, max_sg_entries);
931 blk_queue_max_phys_segments(q, max_sg_entries);
932
933 /* assign drive queue */
934 drive->queue = q;
935
936 /* needs drive->queue to be set */
937 ide_toggle_bounce(drive, 1);
938
939 return 0;
940 }
941
942 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
943 {
944 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
945
946 spin_lock_irq(&ide_lock);
947 if (!hwgroup->drive) {
948 /* first drive for hwgroup. */
949 drive->next = drive;
950 hwgroup->drive = drive;
951 hwgroup->hwif = HWIF(hwgroup->drive);
952 } else {
953 drive->next = hwgroup->drive->next;
954 hwgroup->drive->next = drive;
955 }
956 spin_unlock_irq(&ide_lock);
957 }
958
959 /*
960 * For any present drive:
961 * - allocate the block device queue
962 * - link drive into the hwgroup
963 */
964 static void ide_port_setup_devices(ide_hwif_t *hwif)
965 {
966 int i;
967
968 mutex_lock(&ide_cfg_mtx);
969 for (i = 0; i < MAX_DRIVES; i++) {
970 ide_drive_t *drive = &hwif->drives[i];
971
972 if (!drive->present)
973 continue;
974
975 if (ide_init_queue(drive)) {
976 printk(KERN_ERR "ide: failed to init %s\n",
977 drive->name);
978 continue;
979 }
980
981 ide_add_drive_to_hwgroup(drive);
982 }
983 mutex_unlock(&ide_cfg_mtx);
984 }
985
986 static ide_hwif_t *ide_ports[MAX_HWIFS];
987
988 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
989 {
990 ide_hwgroup_t *hwgroup = hwif->hwgroup;
991
992 ide_ports[hwif->index] = NULL;
993
994 spin_lock_irq(&ide_lock);
995 /*
996 * Remove us from the hwgroup, and free
997 * the hwgroup if we were the only member
998 */
999 if (hwif->next == hwif) {
1000 BUG_ON(hwgroup->hwif != hwif);
1001 kfree(hwgroup);
1002 } else {
1003 /* There is another interface in hwgroup.
1004 * Unlink us, and set hwgroup->drive and ->hwif to
1005 * something sane.
1006 */
1007 ide_hwif_t *g = hwgroup->hwif;
1008
1009 while (g->next != hwif)
1010 g = g->next;
1011 g->next = hwif->next;
1012 if (hwgroup->hwif == hwif) {
1013 /* Chose a random hwif for hwgroup->hwif.
1014 * It's guaranteed that there are no drives
1015 * left in the hwgroup.
1016 */
1017 BUG_ON(hwgroup->drive != NULL);
1018 hwgroup->hwif = g;
1019 }
1020 BUG_ON(hwgroup->hwif == hwif);
1021 }
1022 spin_unlock_irq(&ide_lock);
1023 }
1024
1025 /*
1026 * This routine sets up the irq for an ide interface, and creates a new
1027 * hwgroup for the irq/hwif if none was previously assigned.
1028 *
1029 * Much of the code is for correctly detecting/handling irq sharing
1030 * and irq serialization situations. This is somewhat complex because
1031 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1032 */
1033 static int init_irq (ide_hwif_t *hwif)
1034 {
1035 struct ide_io_ports *io_ports = &hwif->io_ports;
1036 unsigned int index;
1037 ide_hwgroup_t *hwgroup;
1038 ide_hwif_t *match = NULL;
1039
1040
1041 BUG_ON(in_interrupt());
1042 BUG_ON(irqs_disabled());
1043 BUG_ON(hwif == NULL);
1044
1045 mutex_lock(&ide_cfg_mtx);
1046 hwif->hwgroup = NULL;
1047 #if MAX_HWIFS > 1
1048 /*
1049 * Group up with any other hwifs that share our irq(s).
1050 */
1051 for (index = 0; index < MAX_HWIFS; index++) {
1052 ide_hwif_t *h = ide_ports[index];
1053
1054 if (h && h->hwgroup) { /* scan only initialized ports */
1055 if (hwif->irq == h->irq) {
1056 hwif->sharing_irq = h->sharing_irq = 1;
1057 if (hwif->chipset != ide_pci ||
1058 h->chipset != ide_pci) {
1059 save_match(hwif, h, &match);
1060 }
1061 }
1062 if (hwif->serialized) {
1063 if (hwif->mate && hwif->mate->irq == h->irq)
1064 save_match(hwif, h, &match);
1065 }
1066 if (h->serialized) {
1067 if (h->mate && hwif->irq == h->mate->irq)
1068 save_match(hwif, h, &match);
1069 }
1070 }
1071 }
1072 #endif /* MAX_HWIFS > 1 */
1073 /*
1074 * If we are still without a hwgroup, then form a new one
1075 */
1076 if (match) {
1077 hwgroup = match->hwgroup;
1078 hwif->hwgroup = hwgroup;
1079 /*
1080 * Link us into the hwgroup.
1081 * This must be done early, do ensure that unexpected_intr
1082 * can find the hwif and prevent irq storms.
1083 * No drives are attached to the new hwif, choose_drive
1084 * can't do anything stupid (yet).
1085 * Add ourself as the 2nd entry to the hwgroup->hwif
1086 * linked list, the first entry is the hwif that owns
1087 * hwgroup->handler - do not change that.
1088 */
1089 spin_lock_irq(&ide_lock);
1090 hwif->next = hwgroup->hwif->next;
1091 hwgroup->hwif->next = hwif;
1092 BUG_ON(hwif->next == hwif);
1093 spin_unlock_irq(&ide_lock);
1094 } else {
1095 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1096 hwif_to_node(hwif));
1097 if (hwgroup == NULL)
1098 goto out_up;
1099
1100 hwif->hwgroup = hwgroup;
1101 hwgroup->hwif = hwif->next = hwif;
1102
1103 init_timer(&hwgroup->timer);
1104 hwgroup->timer.function = &ide_timer_expiry;
1105 hwgroup->timer.data = (unsigned long) hwgroup;
1106 }
1107
1108 ide_ports[hwif->index] = hwif;
1109
1110 /*
1111 * Allocate the irq, if not already obtained for another hwif
1112 */
1113 if (!match || match->irq != hwif->irq) {
1114 int sa = 0;
1115 #if defined(__mc68000__)
1116 sa = IRQF_SHARED;
1117 #endif /* __mc68000__ */
1118
1119 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1120 sa = IRQF_SHARED;
1121
1122 if (io_ports->ctl_addr)
1123 hwif->tp_ops->set_irq(hwif, 1);
1124
1125 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1126 goto out_unlink;
1127 }
1128
1129 if (!hwif->rqsize) {
1130 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1131 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1132 hwif->rqsize = 256;
1133 else
1134 hwif->rqsize = 65536;
1135 }
1136
1137 #if !defined(__mc68000__)
1138 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1139 io_ports->data_addr, io_ports->status_addr,
1140 io_ports->ctl_addr, hwif->irq);
1141 #else
1142 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1143 io_ports->data_addr, hwif->irq);
1144 #endif /* __mc68000__ */
1145 if (match)
1146 printk(KERN_CONT " (%sed with %s)",
1147 hwif->sharing_irq ? "shar" : "serializ", match->name);
1148 printk(KERN_CONT "\n");
1149
1150 mutex_unlock(&ide_cfg_mtx);
1151 return 0;
1152 out_unlink:
1153 ide_remove_port_from_hwgroup(hwif);
1154 out_up:
1155 mutex_unlock(&ide_cfg_mtx);
1156 return 1;
1157 }
1158
1159 static int ata_lock(dev_t dev, void *data)
1160 {
1161 /* FIXME: we want to pin hwif down */
1162 return 0;
1163 }
1164
1165 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1166 {
1167 ide_hwif_t *hwif = data;
1168 int unit = *part >> PARTN_BITS;
1169 ide_drive_t *drive = &hwif->drives[unit];
1170 if (!drive->present)
1171 return NULL;
1172
1173 if (drive->media == ide_disk)
1174 request_module("ide-disk");
1175 if (drive->scsi)
1176 request_module("ide-scsi");
1177 if (drive->media == ide_cdrom || drive->media == ide_optical)
1178 request_module("ide-cd");
1179 if (drive->media == ide_tape)
1180 request_module("ide-tape");
1181 if (drive->media == ide_floppy)
1182 request_module("ide-floppy");
1183
1184 return NULL;
1185 }
1186
1187 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1188 {
1189 struct gendisk *p = data;
1190 *part &= (1 << PARTN_BITS) - 1;
1191 return &p->dev.kobj;
1192 }
1193
1194 static int exact_lock(dev_t dev, void *data)
1195 {
1196 struct gendisk *p = data;
1197
1198 if (!get_disk(p))
1199 return -1;
1200 return 0;
1201 }
1202
1203 void ide_register_region(struct gendisk *disk)
1204 {
1205 blk_register_region(MKDEV(disk->major, disk->first_minor),
1206 disk->minors, NULL, exact_match, exact_lock, disk);
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_register_region);
1210
1211 void ide_unregister_region(struct gendisk *disk)
1212 {
1213 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1214 disk->minors);
1215 }
1216
1217 EXPORT_SYMBOL_GPL(ide_unregister_region);
1218
1219 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1220 {
1221 ide_hwif_t *hwif = drive->hwif;
1222 unsigned int unit = (drive->select.all >> 4) & 1;
1223
1224 disk->major = hwif->major;
1225 disk->first_minor = unit << PARTN_BITS;
1226 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1227 disk->queue = drive->queue;
1228 }
1229
1230 EXPORT_SYMBOL_GPL(ide_init_disk);
1231
1232 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1233 {
1234 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1235
1236 if (drive == drive->next) {
1237 /* special case: last drive from hwgroup. */
1238 BUG_ON(hwgroup->drive != drive);
1239 hwgroup->drive = NULL;
1240 } else {
1241 ide_drive_t *walk;
1242
1243 walk = hwgroup->drive;
1244 while (walk->next != drive)
1245 walk = walk->next;
1246 walk->next = drive->next;
1247 if (hwgroup->drive == drive) {
1248 hwgroup->drive = drive->next;
1249 hwgroup->hwif = hwgroup->drive->hwif;
1250 }
1251 }
1252 BUG_ON(hwgroup->drive == drive);
1253 }
1254
1255 static void drive_release_dev (struct device *dev)
1256 {
1257 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1258
1259 ide_proc_unregister_device(drive);
1260
1261 spin_lock_irq(&ide_lock);
1262 ide_remove_drive_from_hwgroup(drive);
1263 kfree(drive->id);
1264 drive->id = NULL;
1265 drive->present = 0;
1266 /* Messed up locking ... */
1267 spin_unlock_irq(&ide_lock);
1268 blk_cleanup_queue(drive->queue);
1269 spin_lock_irq(&ide_lock);
1270 drive->queue = NULL;
1271 spin_unlock_irq(&ide_lock);
1272
1273 complete(&drive->gendev_rel_comp);
1274 }
1275
1276 static int hwif_init(ide_hwif_t *hwif)
1277 {
1278 int old_irq;
1279
1280 if (!hwif->irq) {
1281 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1282 if (!hwif->irq) {
1283 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1284 return 0;
1285 }
1286 }
1287
1288 if (register_blkdev(hwif->major, hwif->name))
1289 return 0;
1290
1291 if (!hwif->sg_max_nents)
1292 hwif->sg_max_nents = PRD_ENTRIES;
1293
1294 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1295 GFP_KERNEL);
1296 if (!hwif->sg_table) {
1297 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1298 goto out;
1299 }
1300
1301 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1302
1303 if (init_irq(hwif) == 0)
1304 goto done;
1305
1306 old_irq = hwif->irq;
1307 /*
1308 * It failed to initialise. Find the default IRQ for
1309 * this port and try that.
1310 */
1311 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1312 if (!hwif->irq) {
1313 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1314 hwif->name, old_irq);
1315 goto out;
1316 }
1317 if (init_irq(hwif)) {
1318 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1319 hwif->name, old_irq, hwif->irq);
1320 goto out;
1321 }
1322 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1323 hwif->name, hwif->irq);
1324
1325 done:
1326 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1327 THIS_MODULE, ata_probe, ata_lock, hwif);
1328 return 1;
1329
1330 out:
1331 unregister_blkdev(hwif->major, hwif->name);
1332 return 0;
1333 }
1334
1335 static void hwif_register_devices(ide_hwif_t *hwif)
1336 {
1337 unsigned int i;
1338
1339 for (i = 0; i < MAX_DRIVES; i++) {
1340 ide_drive_t *drive = &hwif->drives[i];
1341 struct device *dev = &drive->gendev;
1342 int ret;
1343
1344 if (!drive->present)
1345 continue;
1346
1347 ide_add_generic_settings(drive);
1348
1349 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1350 dev->parent = &hwif->gendev;
1351 dev->bus = &ide_bus_type;
1352 dev->driver_data = drive;
1353 dev->release = drive_release_dev;
1354
1355 ret = device_register(dev);
1356 if (ret < 0)
1357 printk(KERN_WARNING "IDE: %s: device_register error: "
1358 "%d\n", __func__, ret);
1359 }
1360 }
1361
1362 static void ide_port_init_devices(ide_hwif_t *hwif)
1363 {
1364 const struct ide_port_ops *port_ops = hwif->port_ops;
1365 int i;
1366
1367 for (i = 0; i < MAX_DRIVES; i++) {
1368 ide_drive_t *drive = &hwif->drives[i];
1369
1370 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1371 drive->io_32bit = 1;
1372 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1373 drive->unmask = 1;
1374 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1375 drive->no_unmask = 1;
1376
1377 if (port_ops && port_ops->init_dev)
1378 port_ops->init_dev(drive);
1379 }
1380 }
1381
1382 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1383 const struct ide_port_info *d)
1384 {
1385 hwif->channel = port;
1386
1387 if (d->chipset)
1388 hwif->chipset = d->chipset;
1389
1390 if (d->init_iops)
1391 d->init_iops(hwif);
1392
1393 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1394 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1395 hwif->irq = port ? 15 : 14;
1396
1397 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1398 hwif->host_flags |= d->host_flags;
1399 hwif->pio_mask = d->pio_mask;
1400
1401 if (d->tp_ops)
1402 hwif->tp_ops = d->tp_ops;
1403
1404 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1405 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1406 hwif->port_ops = d->port_ops;
1407
1408 hwif->swdma_mask = d->swdma_mask;
1409 hwif->mwdma_mask = d->mwdma_mask;
1410 hwif->ultra_mask = d->udma_mask;
1411
1412 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1413 int rc;
1414
1415 if (d->init_dma)
1416 rc = d->init_dma(hwif, d);
1417 else
1418 rc = ide_hwif_setup_dma(hwif, d);
1419
1420 if (rc < 0) {
1421 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1422 hwif->dma_base = 0;
1423 hwif->swdma_mask = 0;
1424 hwif->mwdma_mask = 0;
1425 hwif->ultra_mask = 0;
1426 } else if (d->dma_ops)
1427 hwif->dma_ops = d->dma_ops;
1428 }
1429
1430 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1431 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1432 if (hwif->mate)
1433 hwif->mate->serialized = hwif->serialized = 1;
1434 }
1435
1436 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1437 hwif->rqsize = 256;
1438
1439 /* call chipset specific routine for each enabled port */
1440 if (d->init_hwif)
1441 d->init_hwif(hwif);
1442 }
1443
1444 static void ide_port_cable_detect(ide_hwif_t *hwif)
1445 {
1446 const struct ide_port_ops *port_ops = hwif->port_ops;
1447
1448 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1449 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1450 hwif->cbl = port_ops->cable_detect(hwif);
1451 }
1452 }
1453
1454 static ssize_t store_delete_devices(struct device *portdev,
1455 struct device_attribute *attr,
1456 const char *buf, size_t n)
1457 {
1458 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1459
1460 if (strncmp(buf, "1", n))
1461 return -EINVAL;
1462
1463 ide_port_unregister_devices(hwif);
1464
1465 return n;
1466 };
1467
1468 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1469
1470 static ssize_t store_scan(struct device *portdev,
1471 struct device_attribute *attr,
1472 const char *buf, size_t n)
1473 {
1474 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1475
1476 if (strncmp(buf, "1", n))
1477 return -EINVAL;
1478
1479 ide_port_unregister_devices(hwif);
1480 ide_port_scan(hwif);
1481
1482 return n;
1483 };
1484
1485 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1486
1487 static struct device_attribute *ide_port_attrs[] = {
1488 &dev_attr_delete_devices,
1489 &dev_attr_scan,
1490 NULL
1491 };
1492
1493 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1494 {
1495 int i, uninitialized_var(rc);
1496
1497 for (i = 0; ide_port_attrs[i]; i++) {
1498 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1499 if (rc)
1500 break;
1501 }
1502
1503 return rc;
1504 }
1505
1506 static unsigned int ide_indexes;
1507
1508 /**
1509 * ide_find_port_slot - find free port slot
1510 * @d: IDE port info
1511 *
1512 * Return the new port slot index or -ENOENT if we are out of free slots.
1513 */
1514
1515 static int ide_find_port_slot(const struct ide_port_info *d)
1516 {
1517 int idx = -ENOENT;
1518 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1519 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1520
1521 /*
1522 * Claim an unassigned slot.
1523 *
1524 * Give preference to claiming other slots before claiming ide0/ide1,
1525 * just in case there's another interface yet-to-be-scanned
1526 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1527 *
1528 * Unless there is a bootable card that does not use the standard
1529 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1530 */
1531 mutex_lock(&ide_cfg_mtx);
1532 if (MAX_HWIFS == 1) {
1533 if (ide_indexes == 0 && i == 0)
1534 idx = 1;
1535 } else {
1536 if (bootable) {
1537 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1538 idx = ffz(ide_indexes | i);
1539 } else {
1540 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1541 idx = ffz(ide_indexes | 3);
1542 else if ((ide_indexes & 3) != 3)
1543 idx = ffz(ide_indexes);
1544 }
1545 }
1546 if (idx >= 0)
1547 ide_indexes |= (1 << idx);
1548 mutex_unlock(&ide_cfg_mtx);
1549
1550 return idx;
1551 }
1552
1553 static void ide_free_port_slot(int idx)
1554 {
1555 mutex_lock(&ide_cfg_mtx);
1556 ide_indexes &= ~(1 << idx);
1557 mutex_unlock(&ide_cfg_mtx);
1558 }
1559
1560 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1561 hw_regs_t **hws)
1562 {
1563 struct ide_host *host;
1564 int i;
1565
1566 host = kzalloc(sizeof(*host), GFP_KERNEL);
1567 if (host == NULL)
1568 return NULL;
1569
1570 for (i = 0; i < MAX_HWIFS; i++) {
1571 ide_hwif_t *hwif;
1572 int idx;
1573
1574 if (hws[i] == NULL)
1575 continue;
1576
1577 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1578 if (hwif == NULL)
1579 continue;
1580
1581 idx = ide_find_port_slot(d);
1582 if (idx < 0) {
1583 printk(KERN_ERR "%s: no free slot for interface\n",
1584 d ? d->name : "ide");
1585 kfree(hwif);
1586 continue;
1587 }
1588
1589 ide_init_port_data(hwif, idx);
1590
1591 hwif->host = host;
1592
1593 host->ports[i] = hwif;
1594 host->n_ports++;
1595 }
1596
1597 if (host->n_ports == 0) {
1598 kfree(host);
1599 return NULL;
1600 }
1601
1602 if (hws[0])
1603 host->dev[0] = hws[0]->dev;
1604
1605 if (d)
1606 host->host_flags = d->host_flags;
1607
1608 return host;
1609 }
1610 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1611
1612 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1613 {
1614 hw_regs_t *hws_all[MAX_HWIFS];
1615 int i;
1616
1617 for (i = 0; i < MAX_HWIFS; i++)
1618 hws_all[i] = (i < 4) ? hws[i] : NULL;
1619
1620 return ide_host_alloc_all(d, hws_all);
1621 }
1622 EXPORT_SYMBOL_GPL(ide_host_alloc);
1623
1624 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1625 hw_regs_t **hws)
1626 {
1627 ide_hwif_t *hwif, *mate = NULL;
1628 int i, j = 0;
1629
1630 for (i = 0; i < MAX_HWIFS; i++) {
1631 hwif = host->ports[i];
1632
1633 if (hwif == NULL) {
1634 mate = NULL;
1635 continue;
1636 }
1637
1638 ide_init_port_hw(hwif, hws[i]);
1639 ide_port_apply_params(hwif);
1640
1641 if (d == NULL) {
1642 mate = NULL;
1643 continue;
1644 }
1645
1646 if ((i & 1) && mate) {
1647 hwif->mate = mate;
1648 mate->mate = hwif;
1649 }
1650
1651 mate = (i & 1) ? NULL : hwif;
1652
1653 ide_init_port(hwif, i & 1, d);
1654 ide_port_cable_detect(hwif);
1655 ide_port_init_devices(hwif);
1656 }
1657
1658 for (i = 0; i < MAX_HWIFS; i++) {
1659 hwif = host->ports[i];
1660
1661 if (hwif == NULL)
1662 continue;
1663
1664 if (ide_probe_port(hwif) == 0)
1665 hwif->present = 1;
1666
1667 if (hwif->chipset != ide_4drives || !hwif->mate ||
1668 !hwif->mate->present)
1669 ide_register_port(hwif);
1670
1671 if (hwif->present)
1672 ide_port_tune_devices(hwif);
1673 }
1674
1675 for (i = 0; i < MAX_HWIFS; i++) {
1676 hwif = host->ports[i];
1677
1678 if (hwif == NULL)
1679 continue;
1680
1681 if (hwif_init(hwif) == 0) {
1682 printk(KERN_INFO "%s: failed to initialize IDE "
1683 "interface\n", hwif->name);
1684 hwif->present = 0;
1685 continue;
1686 }
1687
1688 j++;
1689
1690 if (hwif->present)
1691 ide_port_setup_devices(hwif);
1692
1693 ide_acpi_init(hwif);
1694
1695 if (hwif->present)
1696 ide_acpi_port_init_devices(hwif);
1697 }
1698
1699 for (i = 0; i < MAX_HWIFS; i++) {
1700 hwif = host->ports[i];
1701
1702 if (hwif == NULL)
1703 continue;
1704
1705 if (hwif->chipset == ide_unknown)
1706 hwif->chipset = ide_generic;
1707
1708 if (hwif->present)
1709 hwif_register_devices(hwif);
1710 }
1711
1712 for (i = 0; i < MAX_HWIFS; i++) {
1713 hwif = host->ports[i];
1714
1715 if (hwif == NULL)
1716 continue;
1717
1718 ide_sysfs_register_port(hwif);
1719 ide_proc_register_port(hwif);
1720
1721 if (hwif->present)
1722 ide_proc_port_register_devices(hwif);
1723 }
1724
1725 return j ? 0 : -1;
1726 }
1727 EXPORT_SYMBOL_GPL(ide_host_register);
1728
1729 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1730 struct ide_host **hostp)
1731 {
1732 struct ide_host *host;
1733 int rc;
1734
1735 host = ide_host_alloc(d, hws);
1736 if (host == NULL)
1737 return -ENOMEM;
1738
1739 rc = ide_host_register(host, d, hws);
1740 if (rc) {
1741 ide_host_free(host);
1742 return rc;
1743 }
1744
1745 if (hostp)
1746 *hostp = host;
1747
1748 return 0;
1749 }
1750 EXPORT_SYMBOL_GPL(ide_host_add);
1751
1752 void ide_host_free(struct ide_host *host)
1753 {
1754 ide_hwif_t *hwif;
1755 int i;
1756
1757 for (i = 0; i < MAX_HWIFS; i++) {
1758 hwif = host->ports[i];
1759
1760 if (hwif == NULL)
1761 continue;
1762
1763 ide_free_port_slot(hwif->index);
1764 kfree(hwif);
1765 }
1766
1767 kfree(host);
1768 }
1769 EXPORT_SYMBOL_GPL(ide_host_free);
1770
1771 void ide_host_remove(struct ide_host *host)
1772 {
1773 int i;
1774
1775 for (i = 0; i < MAX_HWIFS; i++) {
1776 if (host->ports[i])
1777 ide_unregister(host->ports[i]);
1778 }
1779
1780 ide_host_free(host);
1781 }
1782 EXPORT_SYMBOL_GPL(ide_host_remove);
1783
1784 void ide_port_scan(ide_hwif_t *hwif)
1785 {
1786 ide_port_apply_params(hwif);
1787 ide_port_cable_detect(hwif);
1788 ide_port_init_devices(hwif);
1789
1790 if (ide_probe_port(hwif) < 0)
1791 return;
1792
1793 hwif->present = 1;
1794
1795 ide_port_tune_devices(hwif);
1796 ide_acpi_port_init_devices(hwif);
1797 ide_port_setup_devices(hwif);
1798 hwif_register_devices(hwif);
1799 ide_proc_port_register_devices(hwif);
1800 }
1801 EXPORT_SYMBOL_GPL(ide_port_scan);
1802
1803 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1804 u8 port_no, const struct ide_port_info *d,
1805 unsigned long config)
1806 {
1807 unsigned long base, ctl;
1808 int irq;
1809
1810 if (port_no == 0) {
1811 base = 0x1f0;
1812 ctl = 0x3f6;
1813 irq = 14;
1814 } else {
1815 base = 0x170;
1816 ctl = 0x376;
1817 irq = 15;
1818 }
1819
1820 if (!request_region(base, 8, d->name)) {
1821 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1822 d->name, base, base + 7);
1823 return;
1824 }
1825
1826 if (!request_region(ctl, 1, d->name)) {
1827 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1828 d->name, ctl);
1829 release_region(base, 8);
1830 return;
1831 }
1832
1833 ide_std_init_ports(hw, base, ctl);
1834 hw->irq = irq;
1835 hw->chipset = d->chipset;
1836 hw->config = config;
1837
1838 hws[port_no] = hw;
1839 }
1840
1841 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1842 {
1843 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1844
1845 memset(&hw, 0, sizeof(hw));
1846
1847 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1848 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1849 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1850
1851 if (hws[0] == NULL && hws[1] == NULL &&
1852 (d->host_flags & IDE_HFLAG_SINGLE))
1853 return -ENOENT;
1854
1855 return ide_host_add(d, hws, NULL);
1856 }
1857 EXPORT_SYMBOL_GPL(ide_legacy_device_add);
Support for the Chinese Samsung S3C2440 based development boards