?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ext4: Remove automatic enabling of the HUGE_FILE feature flag
[linux-2.6/mini2440.git] / drivers / ide / ide-probe.c
blob19f8c7770a25d7449486b3df07b56cf536ee5b76
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 /* we don't do head unloading on ATAPI devices */
212 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
213 return;
214 }
215
216 /*
217 * Not an ATAPI device: looks like a "regular" hard disk
218 */
219
220 is_cfa = ata_id_is_cfa(id);
221
222 /* CF devices are *not* removable in Linux definition of the term */
223 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
224 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
225
226 drive->media = ide_disk;
227
228 if (!ata_id_has_unload(drive->id))
229 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
230
231 printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
232
233 return;
234
235 err_misc:
236 kfree(id);
237 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
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) & ~ATA_IDX)
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 == ATA_CMD_ID_ATAPI) {
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 == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298
299 if (ide_busy_sleep(hwif, timeout, use_altstatus))
300 return 1;
301
302 /* wait for IRQ and ATA_DRQ */
303 msleep(50);
304 s = tp_ops->read_status(hwif);
305
306 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
307 unsigned long flags;
308
309 /* local CPU only; some systems need this */
310 local_irq_save(flags);
311 /* drive returned ID */
312 do_identify(drive, cmd);
313 /* drive responded with ID */
314 rc = 0;
315 /* clear drive IRQ */
316 (void)tp_ops->read_status(hwif);
317 local_irq_restore(flags);
318 } else {
319 /* drive refused ID */
320 rc = 2;
321 }
322 return rc;
323 }
324
325 /**
326 * try_to_identify - try to identify a drive
327 * @drive: drive to probe
328 * @cmd: command to use
329 *
330 * Issue the identify command and then do IRQ probing to
331 * complete the identification when needed by finding the
332 * IRQ the drive is attached to
333 */
334
335 static int try_to_identify (ide_drive_t *drive, u8 cmd)
336 {
337 ide_hwif_t *hwif = HWIF(drive);
338 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
339 int retval;
340 int autoprobe = 0;
341 unsigned long cookie = 0;
342
343 /*
344 * Disable device irq unless we need to
345 * probe for it. Otherwise we'll get spurious
346 * interrupts during the identify-phase that
347 * the irq handler isn't expecting.
348 */
349 if (hwif->io_ports.ctl_addr) {
350 if (!hwif->irq) {
351 autoprobe = 1;
352 cookie = probe_irq_on();
353 }
354 tp_ops->set_irq(hwif, autoprobe);
355 }
356
357 retval = actual_try_to_identify(drive, cmd);
358
359 if (autoprobe) {
360 int irq;
361
362 tp_ops->set_irq(hwif, 0);
363 /* clear drive IRQ */
364 (void)tp_ops->read_status(hwif);
365 udelay(5);
366 irq = probe_irq_off(cookie);
367 if (!hwif->irq) {
368 if (irq > 0) {
369 hwif->irq = irq;
370 } else {
371 /* Mmmm.. multiple IRQs..
372 * don't know which was ours
373 */
374 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
375 drive->name, cookie);
376 }
377 }
378 }
379 return retval;
380 }
381
382 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
383 {
384 u8 stat;
385
386 timeout += jiffies;
387
388 do {
389 msleep(50); /* give drive a breather */
390 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
391 : hwif->tp_ops->read_status(hwif);
392 if ((stat & ATA_BUSY) == 0)
393 return 0;
394 } while (time_before(jiffies, timeout));
395
396 return 1; /* drive timed-out */
397 }
398
399 static u8 ide_read_device(ide_drive_t *drive)
400 {
401 ide_task_t task;
402
403 memset(&task, 0, sizeof(task));
404 task.tf_flags = IDE_TFLAG_IN_DEVICE;
405
406 drive->hwif->tp_ops->tf_read(drive, &task);
407
408 return task.tf.device;
409 }
410
411 /**
412 * do_probe - probe an IDE device
413 * @drive: drive to probe
414 * @cmd: command to use
415 *
416 * do_probe() has the difficult job of finding a drive if it exists,
417 * without getting hung up if it doesn't exist, without trampling on
418 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
419 *
420 * If a drive is "known" to exist (from CMOS or kernel parameters),
421 * but does not respond right away, the probe will "hang in there"
422 * for the maximum wait time (about 30 seconds), otherwise it will
423 * exit much more quickly.
424 *
425 * Returns: 0 device was identified
426 * 1 device timed-out (no response to identify request)
427 * 2 device aborted the command (refused to identify itself)
428 * 3 bad status from device (possible for ATAPI drives)
429 * 4 probe was not attempted because failure was obvious
430 */
431
432 static int do_probe (ide_drive_t *drive, u8 cmd)
433 {
434 ide_hwif_t *hwif = HWIF(drive);
435 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
436 int rc;
437 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
438
439 /* avoid waiting for inappropriate probes */
440 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
441 return 4;
442
443 #ifdef DEBUG
444 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
445 drive->name, present, drive->media,
446 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
447 #endif
448
449 /* needed for some systems
450 * (e.g. crw9624 as drive0 with disk as slave)
451 */
452 msleep(50);
453 SELECT_DRIVE(drive);
454 msleep(50);
455
456 if (ide_read_device(drive) != drive->select && present == 0) {
457 if (drive->dn & 1) {
458 /* exit with drive0 selected */
459 SELECT_DRIVE(&hwif->drives[0]);
460 /* allow ATA_BUSY to assert & clear */
461 msleep(50);
462 }
463 /* no i/f present: mmm.. this should be a 4 -ml */
464 return 3;
465 }
466
467 stat = tp_ops->read_status(hwif);
468
469 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
470 present || cmd == ATA_CMD_ID_ATAPI) {
471 /* send cmd and wait */
472 if ((rc = try_to_identify(drive, cmd))) {
473 /* failed: try again */
474 rc = try_to_identify(drive,cmd);
475 }
476
477 stat = tp_ops->read_status(hwif);
478
479 if (stat == (ATA_BUSY | ATA_DRDY))
480 return 4;
481
482 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
483 printk(KERN_ERR "%s: no response (status = 0x%02x), "
484 "resetting drive\n", drive->name, stat);
485 msleep(50);
486 SELECT_DRIVE(drive);
487 msleep(50);
488 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
489 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
490 rc = try_to_identify(drive, cmd);
491 }
492
493 /* ensure drive IRQ is clear */
494 stat = tp_ops->read_status(hwif);
495
496 if (rc == 1)
497 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
498 drive->name, stat);
499 } else {
500 /* not present or maybe ATAPI */
501 rc = 3;
502 }
503 if (drive->dn & 1) {
504 /* exit with drive0 selected */
505 SELECT_DRIVE(&hwif->drives[0]);
506 msleep(50);
507 /* ensure drive irq is clear */
508 (void)tp_ops->read_status(hwif);
509 }
510 return rc;
511 }
512
513 /*
514 *
515 */
516 static void enable_nest (ide_drive_t *drive)
517 {
518 ide_hwif_t *hwif = HWIF(drive);
519 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
520 u8 stat;
521
522 printk(KERN_INFO "%s: enabling %s -- ",
523 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
524
525 SELECT_DRIVE(drive);
526 msleep(50);
527 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
528
529 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
530 printk(KERN_CONT "failed (timeout)\n");
531 return;
532 }
533
534 msleep(50);
535
536 stat = tp_ops->read_status(hwif);
537
538 if (!OK_STAT(stat, 0, BAD_STAT))
539 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
540 else
541 printk(KERN_CONT "success\n");
542 }
543
544 /**
545 * probe_for_drives - upper level drive probe
546 * @drive: drive to probe for
547 *
548 * probe_for_drive() tests for existence of a given drive using do_probe()
549 * and presents things to the user as needed.
550 *
551 * Returns: 0 no device was found
552 * 1 device was found
553 * (note: IDE_DFLAG_PRESENT might still be not set)
554 */
555
556 static inline u8 probe_for_drive (ide_drive_t *drive)
557 {
558 char *m;
559
560 /*
561 * In order to keep things simple we have an id
562 * block for all drives at all times. If the device
563 * is pre ATA or refuses ATA/ATAPI identify we
564 * will add faked data to this.
565 *
566 * Also note that 0 everywhere means "can't do X"
567 */
568
569 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
570
571 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
572 if (drive->id == NULL) {
573 printk(KERN_ERR "ide: out of memory for id data.\n");
574 return 0;
575 }
576
577 m = (char *)&drive->id[ATA_ID_PROD];
578 strcpy(m, "UNKNOWN");
579
580 /* skip probing? */
581 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
582 retry:
583 /* if !(success||timed-out) */
584 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
585 /* look for ATAPI device */
586 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
587
588 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
589 /* drive not found */
590 return 0;
591
592 if (strstr(m, "E X A B Y T E N E S T")) {
593 enable_nest(drive);
594 goto retry;
595 }
596
597 /* identification failed? */
598 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
599 if (drive->media == ide_disk) {
600 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
601 drive->name, drive->cyl,
602 drive->head, drive->sect);
603 } else if (drive->media == ide_cdrom) {
604 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
605 } else {
606 /* nuke it */
607 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
608 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
609 }
610 }
611 /* drive was found */
612 }
613
614 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
615 return 0;
616
617 /* The drive wasn't being helpful. Add generic info only */
618 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
619 generic_id(drive);
620 return 1;
621 }
622
623 if (drive->media == ide_disk) {
624 ide_disk_init_chs(drive);
625 ide_disk_init_mult_count(drive);
626 }
627
628 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
629 }
630
631 static void hwif_release_dev(struct device *dev)
632 {
633 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
634
635 complete(&hwif->gendev_rel_comp);
636 }
637
638 static int ide_register_port(ide_hwif_t *hwif)
639 {
640 int ret;
641
642 /* register with global device tree */
643 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
644 hwif->gendev.driver_data = hwif;
645 if (hwif->gendev.parent == NULL) {
646 if (hwif->dev)
647 hwif->gendev.parent = hwif->dev;
648 else
649 /* Would like to do = &device_legacy */
650 hwif->gendev.parent = NULL;
651 }
652 hwif->gendev.release = hwif_release_dev;
653 ret = device_register(&hwif->gendev);
654 if (ret < 0) {
655 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
656 __func__, ret);
657 goto out;
658 }
659
660 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
661 MKDEV(0, 0), hwif, hwif->name);
662 if (IS_ERR(hwif->portdev)) {
663 ret = PTR_ERR(hwif->portdev);
664 device_unregister(&hwif->gendev);
665 }
666 out:
667 return ret;
668 }
669
670 /**
671 * ide_port_wait_ready - wait for port to become ready
672 * @hwif: IDE port
673 *
674 * This is needed on some PPCs and a bunch of BIOS-less embedded
675 * platforms. Typical cases are:
676 *
677 * - The firmware hard reset the disk before booting the kernel,
678 * the drive is still doing it's poweron-reset sequence, that
679 * can take up to 30 seconds.
680 *
681 * - The firmware does nothing (or no firmware), the device is
682 * still in POST state (same as above actually).
683 *
684 * - Some CD/DVD/Writer combo drives tend to drive the bus during
685 * their reset sequence even when they are non-selected slave
686 * devices, thus preventing discovery of the main HD.
687 *
688 * Doing this wait-for-non-busy should not harm any existing
689 * configuration and fix some issues like the above.
690 *
691 * BenH.
692 *
693 * Returns 0 on success, error code (< 0) otherwise.
694 */
695
696 static int ide_port_wait_ready(ide_hwif_t *hwif)
697 {
698 int unit, rc;
699
700 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
701
702 /* Let HW settle down a bit from whatever init state we
703 * come from */
704 mdelay(2);
705
706 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
707 * I know of at least one disk who takes 31 seconds, I use 35
708 * here to be safe
709 */
710 rc = ide_wait_not_busy(hwif, 35000);
711 if (rc)
712 return rc;
713
714 /* Now make sure both master & slave are ready */
715 for (unit = 0; unit < MAX_DRIVES; unit++) {
716 ide_drive_t *drive = &hwif->drives[unit];
717
718 /* Ignore disks that we will not probe for later. */
719 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
720 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
721 SELECT_DRIVE(drive);
722 hwif->tp_ops->set_irq(hwif, 1);
723 mdelay(2);
724 rc = ide_wait_not_busy(hwif, 35000);
725 if (rc)
726 goto out;
727 } else
728 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
729 drive->name);
730 }
731 out:
732 /* Exit function with master reselected (let's be sane) */
733 if (unit)
734 SELECT_DRIVE(&hwif->drives[0]);
735
736 return rc;
737 }
738
739 /**
740 * ide_undecoded_slave - look for bad CF adapters
741 * @dev1: slave device
742 *
743 * Analyse the drives on the interface and attempt to decide if we
744 * have the same drive viewed twice. This occurs with crap CF adapters
745 * and PCMCIA sometimes.
746 */
747
748 void ide_undecoded_slave(ide_drive_t *dev1)
749 {
750 ide_drive_t *dev0 = &dev1->hwif->drives[0];
751
752 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
753 return;
754
755 /* If the models don't match they are not the same product */
756 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
757 (char *)&dev1->id[ATA_ID_PROD]))
758 return;
759
760 /* Serial numbers do not match */
761 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
762 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
763 return;
764
765 /* No serial number, thankfully very rare for CF */
766 if (*(char *)&dev0->id[ATA_ID_SERNO] == 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 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
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].dev_flags & IDE_DFLAG_NOPROBE) &&
786 (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
787 return -EACCES;
788
789 /*
790 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
791 * we'll install our IRQ driver much later...
792 */
793 irqd = hwif->irq;
794 if (irqd)
795 disable_irq(hwif->irq);
796
797 local_irq_set(flags);
798
799 if (ide_port_wait_ready(hwif) == -EBUSY)
800 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
801
802 /*
803 * Second drive should only exist if first drive was found,
804 * but a lot of cdrom drives are configured as single slaves.
805 */
806 for (unit = 0; unit < MAX_DRIVES; ++unit) {
807 ide_drive_t *drive = &hwif->drives[unit];
808
809 (void) probe_for_drive(drive);
810 if (drive->dev_flags & IDE_DFLAG_PRESENT)
811 rc = 0;
812 }
813
814 local_irq_restore(flags);
815
816 /*
817 * Use cached IRQ number. It might be (and is...) changed by probe
818 * code above
819 */
820 if (irqd)
821 enable_irq(irqd);
822
823 return rc;
824 }
825
826 static void ide_port_tune_devices(ide_hwif_t *hwif)
827 {
828 const struct ide_port_ops *port_ops = hwif->port_ops;
829 int unit;
830
831 for (unit = 0; unit < MAX_DRIVES; unit++) {
832 ide_drive_t *drive = &hwif->drives[unit];
833
834 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
835 if (port_ops && port_ops->quirkproc)
836 port_ops->quirkproc(drive);
837 }
838 }
839
840 for (unit = 0; unit < MAX_DRIVES; ++unit) {
841 ide_drive_t *drive = &hwif->drives[unit];
842
843 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
844 ide_set_max_pio(drive);
845
846 drive->dev_flags |= IDE_DFLAG_NICE1;
847
848 if (hwif->dma_ops)
849 ide_set_dma(drive);
850 }
851 }
852
853 for (unit = 0; unit < MAX_DRIVES; ++unit) {
854 ide_drive_t *drive = &hwif->drives[unit];
855
856 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
857 drive->id[ATA_ID_DWORD_IO])
858 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
859 else
860 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
861 }
862 }
863
864 /*
865 * save_match() is used to simplify logic in init_irq() below.
866 *
867 * A loophole here is that we may not know about a particular
868 * hwif's irq until after that hwif is actually probed/initialized..
869 * This could be a problem for the case where an hwif is on a
870 * dual interface that requires serialization (eg. cmd640) and another
871 * hwif using one of the same irqs is initialized beforehand.
872 *
873 * This routine detects and reports such situations, but does not fix them.
874 */
875 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
876 {
877 ide_hwif_t *m = *match;
878
879 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
880 if (!new->hwgroup)
881 return;
882 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
883 hwif->name, new->name, m->name);
884 }
885 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
886 *match = new;
887 }
888
889 /*
890 * init request queue
891 */
892 static int ide_init_queue(ide_drive_t *drive)
893 {
894 struct request_queue *q;
895 ide_hwif_t *hwif = HWIF(drive);
896 int max_sectors = 256;
897 int max_sg_entries = PRD_ENTRIES;
898
899 /*
900 * Our default set up assumes the normal IDE case,
901 * that is 64K segmenting, standard PRD setup
902 * and LBA28. Some drivers then impose their own
903 * limits and LBA48 we could raise it but as yet
904 * do not.
905 */
906
907 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
908 if (!q)
909 return 1;
910
911 q->queuedata = drive;
912 blk_queue_segment_boundary(q, 0xffff);
913
914 if (hwif->rqsize < max_sectors)
915 max_sectors = hwif->rqsize;
916 blk_queue_max_sectors(q, max_sectors);
917
918 #ifdef CONFIG_PCI
919 /* When we have an IOMMU, we may have a problem where pci_map_sg()
920 * creates segments that don't completely match our boundary
921 * requirements and thus need to be broken up again. Because it
922 * doesn't align properly either, we may actually have to break up
923 * to more segments than what was we got in the first place, a max
924 * worst case is twice as many.
925 * This will be fixed once we teach pci_map_sg() about our boundary
926 * requirements, hopefully soon. *FIXME*
927 */
928 if (!PCI_DMA_BUS_IS_PHYS)
929 max_sg_entries >>= 1;
930 #endif /* CONFIG_PCI */
931
932 blk_queue_max_hw_segments(q, max_sg_entries);
933 blk_queue_max_phys_segments(q, max_sg_entries);
934
935 /* assign drive queue */
936 drive->queue = q;
937
938 /* needs drive->queue to be set */
939 ide_toggle_bounce(drive, 1);
940
941 return 0;
942 }
943
944 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
945 {
946 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
947
948 spin_lock_irq(&ide_lock);
949 if (!hwgroup->drive) {
950 /* first drive for hwgroup. */
951 drive->next = drive;
952 hwgroup->drive = drive;
953 hwgroup->hwif = HWIF(hwgroup->drive);
954 } else {
955 drive->next = hwgroup->drive->next;
956 hwgroup->drive->next = drive;
957 }
958 spin_unlock_irq(&ide_lock);
959 }
960
961 /*
962 * For any present drive:
963 * - allocate the block device queue
964 * - link drive into the hwgroup
965 */
966 static int ide_port_setup_devices(ide_hwif_t *hwif)
967 {
968 int i, j = 0;
969
970 mutex_lock(&ide_cfg_mtx);
971 for (i = 0; i < MAX_DRIVES; i++) {
972 ide_drive_t *drive = &hwif->drives[i];
973
974 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
975 continue;
976
977 if (ide_init_queue(drive)) {
978 printk(KERN_ERR "ide: failed to init %s\n",
979 drive->name);
980 kfree(drive->id);
981 drive->id = NULL;
982 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
983 continue;
984 }
985
986 j++;
987
988 ide_add_drive_to_hwgroup(drive);
989 }
990 mutex_unlock(&ide_cfg_mtx);
991
992 return j;
993 }
994
995 static ide_hwif_t *ide_ports[MAX_HWIFS];
996
997 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
998 {
999 ide_hwgroup_t *hwgroup = hwif->hwgroup;
1000
1001 ide_ports[hwif->index] = NULL;
1002
1003 spin_lock_irq(&ide_lock);
1004 /*
1005 * Remove us from the hwgroup, and free
1006 * the hwgroup if we were the only member
1007 */
1008 if (hwif->next == hwif) {
1009 BUG_ON(hwgroup->hwif != hwif);
1010 kfree(hwgroup);
1011 } else {
1012 /* There is another interface in hwgroup.
1013 * Unlink us, and set hwgroup->drive and ->hwif to
1014 * something sane.
1015 */
1016 ide_hwif_t *g = hwgroup->hwif;
1017
1018 while (g->next != hwif)
1019 g = g->next;
1020 g->next = hwif->next;
1021 if (hwgroup->hwif == hwif) {
1022 /* Chose a random hwif for hwgroup->hwif.
1023 * It's guaranteed that there are no drives
1024 * left in the hwgroup.
1025 */
1026 BUG_ON(hwgroup->drive != NULL);
1027 hwgroup->hwif = g;
1028 }
1029 BUG_ON(hwgroup->hwif == hwif);
1030 }
1031 spin_unlock_irq(&ide_lock);
1032 }
1033
1034 /*
1035 * This routine sets up the irq for an ide interface, and creates a new
1036 * hwgroup for the irq/hwif if none was previously assigned.
1037 *
1038 * Much of the code is for correctly detecting/handling irq sharing
1039 * and irq serialization situations. This is somewhat complex because
1040 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1041 */
1042 static int init_irq (ide_hwif_t *hwif)
1043 {
1044 struct ide_io_ports *io_ports = &hwif->io_ports;
1045 unsigned int index;
1046 ide_hwgroup_t *hwgroup;
1047 ide_hwif_t *match = NULL;
1048
1049 mutex_lock(&ide_cfg_mtx);
1050 hwif->hwgroup = NULL;
1051
1052 /*
1053 * Group up with any other hwifs that share our irq(s).
1054 */
1055 for (index = 0; index < MAX_HWIFS; index++) {
1056 ide_hwif_t *h = ide_ports[index];
1057
1058 if (h && h->hwgroup) { /* scan only initialized ports */
1059 if (hwif->irq == h->irq) {
1060 hwif->sharing_irq = h->sharing_irq = 1;
1061 if (hwif->chipset != ide_pci ||
1062 h->chipset != ide_pci) {
1063 save_match(hwif, h, &match);
1064 }
1065 }
1066 if (hwif->serialized) {
1067 if (hwif->mate && hwif->mate->irq == h->irq)
1068 save_match(hwif, h, &match);
1069 }
1070 if (h->serialized) {
1071 if (h->mate && hwif->irq == h->mate->irq)
1072 save_match(hwif, h, &match);
1073 }
1074 }
1075 }
1076
1077 /*
1078 * If we are still without a hwgroup, then form a new one
1079 */
1080 if (match) {
1081 hwgroup = match->hwgroup;
1082 hwif->hwgroup = hwgroup;
1083 /*
1084 * Link us into the hwgroup.
1085 * This must be done early, do ensure that unexpected_intr
1086 * can find the hwif and prevent irq storms.
1087 * No drives are attached to the new hwif, choose_drive
1088 * can't do anything stupid (yet).
1089 * Add ourself as the 2nd entry to the hwgroup->hwif
1090 * linked list, the first entry is the hwif that owns
1091 * hwgroup->handler - do not change that.
1092 */
1093 spin_lock_irq(&ide_lock);
1094 hwif->next = hwgroup->hwif->next;
1095 hwgroup->hwif->next = hwif;
1096 BUG_ON(hwif->next == hwif);
1097 spin_unlock_irq(&ide_lock);
1098 } else {
1099 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1100 hwif_to_node(hwif));
1101 if (hwgroup == NULL)
1102 goto out_up;
1103
1104 hwif->hwgroup = hwgroup;
1105 hwgroup->hwif = hwif->next = hwif;
1106
1107 init_timer(&hwgroup->timer);
1108 hwgroup->timer.function = &ide_timer_expiry;
1109 hwgroup->timer.data = (unsigned long) hwgroup;
1110 }
1111
1112 ide_ports[hwif->index] = hwif;
1113
1114 /*
1115 * Allocate the irq, if not already obtained for another hwif
1116 */
1117 if (!match || match->irq != hwif->irq) {
1118 int sa = 0;
1119 #if defined(__mc68000__)
1120 sa = IRQF_SHARED;
1121 #endif /* __mc68000__ */
1122
1123 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1124 hwif->chipset == ide_ali14xx)
1125 sa = IRQF_SHARED;
1126
1127 if (io_ports->ctl_addr)
1128 hwif->tp_ops->set_irq(hwif, 1);
1129
1130 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1131 goto out_unlink;
1132 }
1133
1134 if (!hwif->rqsize) {
1135 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1136 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1137 hwif->rqsize = 256;
1138 else
1139 hwif->rqsize = 65536;
1140 }
1141
1142 #if !defined(__mc68000__)
1143 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1144 io_ports->data_addr, io_ports->status_addr,
1145 io_ports->ctl_addr, hwif->irq);
1146 #else
1147 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1148 io_ports->data_addr, hwif->irq);
1149 #endif /* __mc68000__ */
1150 if (match)
1151 printk(KERN_CONT " (%sed with %s)",
1152 hwif->sharing_irq ? "shar" : "serializ", match->name);
1153 printk(KERN_CONT "\n");
1154
1155 mutex_unlock(&ide_cfg_mtx);
1156 return 0;
1157 out_unlink:
1158 ide_remove_port_from_hwgroup(hwif);
1159 out_up:
1160 mutex_unlock(&ide_cfg_mtx);
1161 return 1;
1162 }
1163
1164 static int ata_lock(dev_t dev, void *data)
1165 {
1166 /* FIXME: we want to pin hwif down */
1167 return 0;
1168 }
1169
1170 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1171 {
1172 ide_hwif_t *hwif = data;
1173 int unit = *part >> PARTN_BITS;
1174 ide_drive_t *drive = &hwif->drives[unit];
1175
1176 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1177 return NULL;
1178
1179 if (drive->media == ide_disk)
1180 request_module("ide-disk");
1181 if (drive->dev_flags & IDE_DFLAG_SCSI)
1182 request_module("ide-scsi");
1183 if (drive->media == ide_cdrom || drive->media == ide_optical)
1184 request_module("ide-cd");
1185 if (drive->media == ide_tape)
1186 request_module("ide-tape");
1187 if (drive->media == ide_floppy)
1188 request_module("ide-floppy");
1189
1190 return NULL;
1191 }
1192
1193 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1194 {
1195 struct gendisk *p = data;
1196 *part &= (1 << PARTN_BITS) - 1;
1197 return &disk_to_dev(p)->kobj;
1198 }
1199
1200 static int exact_lock(dev_t dev, void *data)
1201 {
1202 struct gendisk *p = data;
1203
1204 if (!get_disk(p))
1205 return -1;
1206 return 0;
1207 }
1208
1209 void ide_register_region(struct gendisk *disk)
1210 {
1211 blk_register_region(MKDEV(disk->major, disk->first_minor),
1212 disk->minors, NULL, exact_match, exact_lock, disk);
1213 }
1214
1215 EXPORT_SYMBOL_GPL(ide_register_region);
1216
1217 void ide_unregister_region(struct gendisk *disk)
1218 {
1219 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1220 disk->minors);
1221 }
1222
1223 EXPORT_SYMBOL_GPL(ide_unregister_region);
1224
1225 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1226 {
1227 ide_hwif_t *hwif = drive->hwif;
1228 unsigned int unit = drive->dn & 1;
1229
1230 disk->major = hwif->major;
1231 disk->first_minor = unit << PARTN_BITS;
1232 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1233 disk->queue = drive->queue;
1234 }
1235
1236 EXPORT_SYMBOL_GPL(ide_init_disk);
1237
1238 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1239 {
1240 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1241
1242 if (drive == drive->next) {
1243 /* special case: last drive from hwgroup. */
1244 BUG_ON(hwgroup->drive != drive);
1245 hwgroup->drive = NULL;
1246 } else {
1247 ide_drive_t *walk;
1248
1249 walk = hwgroup->drive;
1250 while (walk->next != drive)
1251 walk = walk->next;
1252 walk->next = drive->next;
1253 if (hwgroup->drive == drive) {
1254 hwgroup->drive = drive->next;
1255 hwgroup->hwif = hwgroup->drive->hwif;
1256 }
1257 }
1258 BUG_ON(hwgroup->drive == drive);
1259 }
1260
1261 static void drive_release_dev (struct device *dev)
1262 {
1263 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1264
1265 ide_proc_unregister_device(drive);
1266
1267 spin_lock_irq(&ide_lock);
1268 ide_remove_drive_from_hwgroup(drive);
1269 kfree(drive->id);
1270 drive->id = NULL;
1271 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1272 /* Messed up locking ... */
1273 spin_unlock_irq(&ide_lock);
1274 blk_cleanup_queue(drive->queue);
1275 spin_lock_irq(&ide_lock);
1276 drive->queue = NULL;
1277 spin_unlock_irq(&ide_lock);
1278
1279 complete(&drive->gendev_rel_comp);
1280 }
1281
1282 static int hwif_init(ide_hwif_t *hwif)
1283 {
1284 int old_irq;
1285
1286 if (!hwif->irq) {
1287 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1288 if (!hwif->irq) {
1289 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1290 return 0;
1291 }
1292 }
1293
1294 if (register_blkdev(hwif->major, hwif->name))
1295 return 0;
1296
1297 if (!hwif->sg_max_nents)
1298 hwif->sg_max_nents = PRD_ENTRIES;
1299
1300 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1301 GFP_KERNEL);
1302 if (!hwif->sg_table) {
1303 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1304 goto out;
1305 }
1306
1307 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1308
1309 if (init_irq(hwif) == 0)
1310 goto done;
1311
1312 old_irq = hwif->irq;
1313 /*
1314 * It failed to initialise. Find the default IRQ for
1315 * this port and try that.
1316 */
1317 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1318 if (!hwif->irq) {
1319 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1320 hwif->name, old_irq);
1321 goto out;
1322 }
1323 if (init_irq(hwif)) {
1324 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1325 hwif->name, old_irq, hwif->irq);
1326 goto out;
1327 }
1328 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1329 hwif->name, hwif->irq);
1330
1331 done:
1332 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1333 THIS_MODULE, ata_probe, ata_lock, hwif);
1334 return 1;
1335
1336 out:
1337 unregister_blkdev(hwif->major, hwif->name);
1338 return 0;
1339 }
1340
1341 static void hwif_register_devices(ide_hwif_t *hwif)
1342 {
1343 unsigned int i;
1344
1345 for (i = 0; i < MAX_DRIVES; i++) {
1346 ide_drive_t *drive = &hwif->drives[i];
1347 struct device *dev = &drive->gendev;
1348 int ret;
1349
1350 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1351 continue;
1352
1353 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1354 dev->parent = &hwif->gendev;
1355 dev->bus = &ide_bus_type;
1356 dev->driver_data = drive;
1357 dev->release = drive_release_dev;
1358
1359 ret = device_register(dev);
1360 if (ret < 0)
1361 printk(KERN_WARNING "IDE: %s: device_register error: "
1362 "%d\n", __func__, ret);
1363 }
1364 }
1365
1366 static void ide_port_init_devices(ide_hwif_t *hwif)
1367 {
1368 const struct ide_port_ops *port_ops = hwif->port_ops;
1369 int i;
1370
1371 for (i = 0; i < MAX_DRIVES; i++) {
1372 ide_drive_t *drive = &hwif->drives[i];
1373
1374 drive->dn = i + hwif->channel * 2;
1375
1376 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1377 drive->io_32bit = 1;
1378 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1379 drive->dev_flags |= IDE_DFLAG_UNMASK;
1380 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1381 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1382
1383 if (port_ops && port_ops->init_dev)
1384 port_ops->init_dev(drive);
1385 }
1386 }
1387
1388 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1389 const struct ide_port_info *d)
1390 {
1391 hwif->channel = port;
1392
1393 if (d->chipset)
1394 hwif->chipset = d->chipset;
1395
1396 if (d->init_iops)
1397 d->init_iops(hwif);
1398
1399 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1400 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1401 hwif->irq = port ? 15 : 14;
1402
1403 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1404 hwif->host_flags |= d->host_flags;
1405 hwif->pio_mask = d->pio_mask;
1406
1407 if (d->tp_ops)
1408 hwif->tp_ops = d->tp_ops;
1409
1410 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1411 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1412 hwif->port_ops = d->port_ops;
1413
1414 hwif->swdma_mask = d->swdma_mask;
1415 hwif->mwdma_mask = d->mwdma_mask;
1416 hwif->ultra_mask = d->udma_mask;
1417
1418 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1419 int rc;
1420
1421 if (d->init_dma)
1422 rc = d->init_dma(hwif, d);
1423 else
1424 rc = ide_hwif_setup_dma(hwif, d);
1425
1426 if (rc < 0) {
1427 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1428 hwif->dma_base = 0;
1429 hwif->swdma_mask = 0;
1430 hwif->mwdma_mask = 0;
1431 hwif->ultra_mask = 0;
1432 } else if (d->dma_ops)
1433 hwif->dma_ops = d->dma_ops;
1434 }
1435
1436 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1437 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1438 if (hwif->mate)
1439 hwif->mate->serialized = hwif->serialized = 1;
1440 }
1441
1442 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1443 hwif->rqsize = 256;
1444
1445 /* call chipset specific routine for each enabled port */
1446 if (d->init_hwif)
1447 d->init_hwif(hwif);
1448 }
1449
1450 static void ide_port_cable_detect(ide_hwif_t *hwif)
1451 {
1452 const struct ide_port_ops *port_ops = hwif->port_ops;
1453
1454 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1455 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1456 hwif->cbl = port_ops->cable_detect(hwif);
1457 }
1458 }
1459
1460 static ssize_t store_delete_devices(struct device *portdev,
1461 struct device_attribute *attr,
1462 const char *buf, size_t n)
1463 {
1464 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1465
1466 if (strncmp(buf, "1", n))
1467 return -EINVAL;
1468
1469 ide_port_unregister_devices(hwif);
1470
1471 return n;
1472 };
1473
1474 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1475
1476 static ssize_t store_scan(struct device *portdev,
1477 struct device_attribute *attr,
1478 const char *buf, size_t n)
1479 {
1480 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1481
1482 if (strncmp(buf, "1", n))
1483 return -EINVAL;
1484
1485 ide_port_unregister_devices(hwif);
1486 ide_port_scan(hwif);
1487
1488 return n;
1489 };
1490
1491 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1492
1493 static struct device_attribute *ide_port_attrs[] = {
1494 &dev_attr_delete_devices,
1495 &dev_attr_scan,
1496 NULL
1497 };
1498
1499 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1500 {
1501 int i, uninitialized_var(rc);
1502
1503 for (i = 0; ide_port_attrs[i]; i++) {
1504 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1505 if (rc)
1506 break;
1507 }
1508
1509 return rc;
1510 }
1511
1512 static unsigned int ide_indexes;
1513
1514 /**
1515 * ide_find_port_slot - find free port slot
1516 * @d: IDE port info
1517 *
1518 * Return the new port slot index or -ENOENT if we are out of free slots.
1519 */
1520
1521 static int ide_find_port_slot(const struct ide_port_info *d)
1522 {
1523 int idx = -ENOENT;
1524 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1525 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1526
1527 /*
1528 * Claim an unassigned slot.
1529 *
1530 * Give preference to claiming other slots before claiming ide0/ide1,
1531 * just in case there's another interface yet-to-be-scanned
1532 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1533 *
1534 * Unless there is a bootable card that does not use the standard
1535 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1536 */
1537 mutex_lock(&ide_cfg_mtx);
1538 if (bootable) {
1539 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1540 idx = ffz(ide_indexes | i);
1541 } else {
1542 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1543 idx = ffz(ide_indexes | 3);
1544 else if ((ide_indexes & 3) != 3)
1545 idx = ffz(ide_indexes);
1546 }
1547 if (idx >= 0)
1548 ide_indexes |= (1 << idx);
1549 mutex_unlock(&ide_cfg_mtx);
1550
1551 return idx;
1552 }
1553
1554 static void ide_free_port_slot(int idx)
1555 {
1556 mutex_lock(&ide_cfg_mtx);
1557 ide_indexes &= ~(1 << idx);
1558 mutex_unlock(&ide_cfg_mtx);
1559 }
1560
1561 struct ide_host *ide_host_alloc(const struct ide_port_info *d, 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_HOST_PORTS; 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->init_chipset = d->init_chipset;
1607 host->host_flags = d->host_flags;
1608 }
1609
1610 return host;
1611 }
1612 EXPORT_SYMBOL_GPL(ide_host_alloc);
1613
1614 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1615 hw_regs_t **hws)
1616 {
1617 ide_hwif_t *hwif, *mate = NULL;
1618 int i, j = 0;
1619
1620 for (i = 0; i < MAX_HOST_PORTS; i++) {
1621 hwif = host->ports[i];
1622
1623 if (hwif == NULL) {
1624 mate = NULL;
1625 continue;
1626 }
1627
1628 ide_init_port_hw(hwif, hws[i]);
1629 ide_port_apply_params(hwif);
1630
1631 if (d == NULL) {
1632 mate = NULL;
1633 } else {
1634 if ((i & 1) && mate) {
1635 hwif->mate = mate;
1636 mate->mate = hwif;
1637 }
1638
1639 mate = (i & 1) ? NULL : hwif;
1640
1641 ide_init_port(hwif, i & 1, d);
1642 ide_port_cable_detect(hwif);
1643 }
1644
1645 ide_port_init_devices(hwif);
1646 }
1647
1648 for (i = 0; i < MAX_HOST_PORTS; i++) {
1649 hwif = host->ports[i];
1650
1651 if (hwif == NULL)
1652 continue;
1653
1654 if (ide_probe_port(hwif) == 0)
1655 hwif->present = 1;
1656
1657 if (hwif->chipset != ide_4drives || !hwif->mate ||
1658 !hwif->mate->present)
1659 ide_register_port(hwif);
1660
1661 if (hwif->present)
1662 ide_port_tune_devices(hwif);
1663 }
1664
1665 for (i = 0; i < MAX_HOST_PORTS; i++) {
1666 hwif = host->ports[i];
1667
1668 if (hwif == NULL)
1669 continue;
1670
1671 if (hwif_init(hwif) == 0) {
1672 printk(KERN_INFO "%s: failed to initialize IDE "
1673 "interface\n", hwif->name);
1674 hwif->present = 0;
1675 continue;
1676 }
1677
1678 if (hwif->present)
1679 if (ide_port_setup_devices(hwif) == 0) {
1680 hwif->present = 0;
1681 continue;
1682 }
1683
1684 j++;
1685
1686 ide_acpi_init(hwif);
1687
1688 if (hwif->present)
1689 ide_acpi_port_init_devices(hwif);
1690 }
1691
1692 for (i = 0; i < MAX_HOST_PORTS; i++) {
1693 hwif = host->ports[i];
1694
1695 if (hwif == NULL)
1696 continue;
1697
1698 if (hwif->chipset == ide_unknown)
1699 hwif->chipset = ide_generic;
1700
1701 if (hwif->present)
1702 hwif_register_devices(hwif);
1703 }
1704
1705 for (i = 0; i < MAX_HOST_PORTS; i++) {
1706 hwif = host->ports[i];
1707
1708 if (hwif == NULL)
1709 continue;
1710
1711 ide_sysfs_register_port(hwif);
1712 ide_proc_register_port(hwif);
1713
1714 if (hwif->present)
1715 ide_proc_port_register_devices(hwif);
1716 }
1717
1718 return j ? 0 : -1;
1719 }
1720 EXPORT_SYMBOL_GPL(ide_host_register);
1721
1722 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1723 struct ide_host **hostp)
1724 {
1725 struct ide_host *host;
1726 int rc;
1727
1728 host = ide_host_alloc(d, hws);
1729 if (host == NULL)
1730 return -ENOMEM;
1731
1732 rc = ide_host_register(host, d, hws);
1733 if (rc) {
1734 ide_host_free(host);
1735 return rc;
1736 }
1737
1738 if (hostp)
1739 *hostp = host;
1740
1741 return 0;
1742 }
1743 EXPORT_SYMBOL_GPL(ide_host_add);
1744
1745 void ide_host_free(struct ide_host *host)
1746 {
1747 ide_hwif_t *hwif;
1748 int i;
1749
1750 for (i = 0; i < MAX_HOST_PORTS; i++) {
1751 hwif = host->ports[i];
1752
1753 if (hwif == NULL)
1754 continue;
1755
1756 ide_free_port_slot(hwif->index);
1757 kfree(hwif);
1758 }
1759
1760 kfree(host);
1761 }
1762 EXPORT_SYMBOL_GPL(ide_host_free);
1763
1764 void ide_host_remove(struct ide_host *host)
1765 {
1766 int i;
1767
1768 for (i = 0; i < MAX_HOST_PORTS; i++) {
1769 if (host->ports[i])
1770 ide_unregister(host->ports[i]);
1771 }
1772
1773 ide_host_free(host);
1774 }
1775 EXPORT_SYMBOL_GPL(ide_host_remove);
1776
1777 void ide_port_scan(ide_hwif_t *hwif)
1778 {
1779 ide_port_apply_params(hwif);
1780 ide_port_cable_detect(hwif);
1781 ide_port_init_devices(hwif);
1782
1783 if (ide_probe_port(hwif) < 0)
1784 return;
1785
1786 hwif->present = 1;
1787
1788 ide_port_tune_devices(hwif);
1789 ide_acpi_port_init_devices(hwif);
1790 ide_port_setup_devices(hwif);
1791 hwif_register_devices(hwif);
1792 ide_proc_port_register_devices(hwif);
1793 }
1794 EXPORT_SYMBOL_GPL(ide_port_scan);
1795
1796 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1797 u8 port_no, const struct ide_port_info *d,
1798 unsigned long config)
1799 {
1800 unsigned long base, ctl;
1801 int irq;
1802
1803 if (port_no == 0) {
1804 base = 0x1f0;
1805 ctl = 0x3f6;
1806 irq = 14;
1807 } else {
1808 base = 0x170;
1809 ctl = 0x376;
1810 irq = 15;
1811 }
1812
1813 if (!request_region(base, 8, d->name)) {
1814 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1815 d->name, base, base + 7);
1816 return;
1817 }
1818
1819 if (!request_region(ctl, 1, d->name)) {
1820 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1821 d->name, ctl);
1822 release_region(base, 8);
1823 return;
1824 }
1825
1826 ide_std_init_ports(hw, base, ctl);
1827 hw->irq = irq;
1828 hw->chipset = d->chipset;
1829 hw->config = config;
1830
1831 hws[port_no] = hw;
1832 }
1833
1834 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1835 {
1836 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1837
1838 memset(&hw, 0, sizeof(hw));
1839
1840 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1841 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1842 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1843
1844 if (hws[0] == NULL && hws[1] == NULL &&
1845 (d->host_flags & IDE_HFLAG_SINGLE))
1846 return -ENOENT;
1847
1848 return ide_host_add(d, hws, NULL);
1849 }
1850 EXPORT_SYMBOL_GPL(ide_legacy_device_add);
Support for the Chinese Samsung S3C2440 based development boards