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
generic_id(ide_drive_t * drive)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
ide_disk_init_chs(ide_drive_t * drive)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
ide_disk_init_mult_count(ide_drive_t * drive)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
ide_classify_ata_dev(ide_drive_t * drive)104 static void ide_classify_ata_dev(ide_drive_t *drive)
105 {
106 u16 *id = drive->id;
107 char *m = (char *)&id[ATA_ID_PROD];
108 int is_cfa = ata_id_is_cfa(id);
109
110 /* CF devices are *not* removable in Linux definition of the term */
111 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
112 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
113
114 drive->media = ide_disk;
115
116 if (!ata_id_has_unload(drive->id))
117 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
118
119 printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
120 is_cfa ? "CFA" : "ATA");
121 }
122
ide_classify_atapi_dev(ide_drive_t * drive)123 static void ide_classify_atapi_dev(ide_drive_t *drive)
124 {
125 u16 *id = drive->id;
126 char *m = (char *)&id[ATA_ID_PROD];
127 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
128
129 printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
130 switch (type) {
131 case ide_floppy:
132 if (!strstr(m, "CD-ROM")) {
133 if (!strstr(m, "oppy") &&
134 !strstr(m, "poyp") &&
135 !strstr(m, "ZIP"))
136 printk(KERN_CONT "cdrom or floppy?, assuming ");
137 if (drive->media != ide_cdrom) {
138 printk(KERN_CONT "FLOPPY");
139 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
140 break;
141 }
142 }
143 /* Early cdrom models used zero */
144 type = ide_cdrom;
145 case ide_cdrom:
146 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
147 #ifdef CONFIG_PPC
148 /* kludge for Apple PowerBook internal zip */
149 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
150 printk(KERN_CONT "FLOPPY");
151 type = ide_floppy;
152 break;
153 }
154 #endif
155 printk(KERN_CONT "CD/DVD-ROM");
156 break;
157 case ide_tape:
158 printk(KERN_CONT "TAPE");
159 break;
160 case ide_optical:
161 printk(KERN_CONT "OPTICAL");
162 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
163 break;
164 default:
165 printk(KERN_CONT "UNKNOWN (type %d)", type);
166 break;
167 }
168
169 printk(KERN_CONT " drive\n");
170 drive->media = type;
171 /* an ATAPI device ignores DRDY */
172 drive->ready_stat = 0;
173 if (ata_id_cdb_intr(id))
174 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
175 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
176 /* we don't do head unloading on ATAPI devices */
177 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
178 }
179
180 /**
181 * do_identify - identify a drive
182 * @drive: drive to identify
183 * @cmd: command used
184 *
185 * Called when we have issued a drive identify command to
186 * read and parse the results. This function is run with
187 * interrupts disabled.
188 */
189
do_identify(ide_drive_t * drive,u8 cmd)190 static void do_identify(ide_drive_t *drive, u8 cmd)
191 {
192 ide_hwif_t *hwif = drive->hwif;
193 u16 *id = drive->id;
194 char *m = (char *)&id[ATA_ID_PROD];
195 unsigned long flags;
196 int bswap = 1;
197
198 /* local CPU only; some systems need this */
199 local_irq_save(flags);
200 /* read 512 bytes of id info */
201 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
202 local_irq_restore(flags);
203
204 drive->dev_flags |= IDE_DFLAG_ID_READ;
205 #ifdef DEBUG
206 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
207 ide_dump_identify((u8 *)id);
208 #endif
209 ide_fix_driveid(id);
210
211 /*
212 * ATA_CMD_ID_ATA returns little-endian info,
213 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
214 */
215 if (cmd == ATA_CMD_ID_ATAPI) {
216 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
217 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
218 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
219 /* Vertos drives may still be weird */
220 bswap ^= 1;
221 }
222
223 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
224 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
225 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
226
227 /* we depend on this a lot! */
228 m[ATA_ID_PROD_LEN - 1] = '\0';
229
230 if (strstr(m, "E X A B Y T E N E S T"))
231 goto err_misc;
232
233 drive->dev_flags |= IDE_DFLAG_PRESENT;
234 drive->dev_flags &= ~IDE_DFLAG_DEAD;
235
236 /*
237 * Check for an ATAPI device
238 */
239 if (cmd == ATA_CMD_ID_ATAPI)
240 ide_classify_atapi_dev(drive);
241 else
242 /*
243 * Not an ATAPI device: looks like a "regular" hard disk
244 */
245 ide_classify_ata_dev(drive);
246 return;
247 err_misc:
248 kfree(id);
249 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
250 }
251
252 /**
253 * actual_try_to_identify - send ata/atapi identify
254 * @drive: drive to identify
255 * @cmd: command to use
256 *
257 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
258 * and waits for a response. It also monitors irqs while this is
259 * happening, in hope of automatically determining which one is
260 * being used by the interface.
261 *
262 * Returns: 0 device was identified
263 * 1 device timed-out (no response to identify request)
264 * 2 device aborted the command (refused to identify itself)
265 */
266
actual_try_to_identify(ide_drive_t * drive,u8 cmd)267 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
268 {
269 ide_hwif_t *hwif = drive->hwif;
270 struct ide_io_ports *io_ports = &hwif->io_ports;
271 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
272 int use_altstatus = 0, rc;
273 unsigned long timeout;
274 u8 s = 0, a = 0;
275
276 /* take a deep breath */
277 msleep(50);
278
279 if (io_ports->ctl_addr &&
280 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
281 a = tp_ops->read_altstatus(hwif);
282 s = tp_ops->read_status(hwif);
283 if ((a ^ s) & ~ATA_IDX)
284 /* ancient Seagate drives, broken interfaces */
285 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
286 "instead of ALTSTATUS(0x%02x)\n",
287 drive->name, s, a);
288 else
289 /* use non-intrusive polling */
290 use_altstatus = 1;
291 }
292
293 /* set features register for atapi
294 * identify command to be sure of reply
295 */
296 if (cmd == ATA_CMD_ID_ATAPI) {
297 ide_task_t task;
298
299 memset(&task, 0, sizeof(task));
300 /* disable DMA & overlap */
301 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
302
303 tp_ops->tf_load(drive, &task);
304 }
305
306 /* ask drive for ID */
307 tp_ops->exec_command(hwif, cmd);
308
309 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
310
311 if (ide_busy_sleep(hwif, timeout, use_altstatus))
312 return 1;
313
314 /* wait for IRQ and ATA_DRQ */
315 msleep(50);
316 s = tp_ops->read_status(hwif);
317
318 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
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 } else {
326 /* drive refused ID */
327 rc = 2;
328 }
329 return rc;
330 }
331
332 /**
333 * try_to_identify - try to identify a drive
334 * @drive: drive to probe
335 * @cmd: command to use
336 *
337 * Issue the identify command and then do IRQ probing to
338 * complete the identification when needed by finding the
339 * IRQ the drive is attached to
340 */
341
try_to_identify(ide_drive_t * drive,u8 cmd)342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
343 {
344 ide_hwif_t *hwif = drive->hwif;
345 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
346 int retval;
347 int autoprobe = 0;
348 unsigned long cookie = 0;
349
350 /*
351 * Disable device irq unless we need to
352 * probe for it. Otherwise we'll get spurious
353 * interrupts during the identify-phase that
354 * the irq handler isn't expecting.
355 */
356 if (hwif->io_ports.ctl_addr) {
357 if (!hwif->irq) {
358 autoprobe = 1;
359 cookie = probe_irq_on();
360 }
361 tp_ops->set_irq(hwif, autoprobe);
362 }
363
364 retval = actual_try_to_identify(drive, cmd);
365
366 if (autoprobe) {
367 int irq;
368
369 tp_ops->set_irq(hwif, 0);
370 /* clear drive IRQ */
371 (void)tp_ops->read_status(hwif);
372 udelay(5);
373 irq = probe_irq_off(cookie);
374 if (!hwif->irq) {
375 if (irq > 0) {
376 hwif->irq = irq;
377 } else {
378 /* Mmmm.. multiple IRQs..
379 * don't know which was ours
380 */
381 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
382 drive->name, cookie);
383 }
384 }
385 }
386 return retval;
387 }
388
ide_busy_sleep(ide_hwif_t * hwif,unsigned long timeout,int altstatus)389 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
390 {
391 u8 stat;
392
393 timeout += jiffies;
394
395 do {
396 msleep(50); /* give drive a breather */
397 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
398 : hwif->tp_ops->read_status(hwif);
399 if ((stat & ATA_BUSY) == 0)
400 return 0;
401 } while (time_before(jiffies, timeout));
402
403 return 1; /* drive timed-out */
404 }
405
ide_read_device(ide_drive_t * drive)406 static u8 ide_read_device(ide_drive_t *drive)
407 {
408 ide_task_t task;
409
410 memset(&task, 0, sizeof(task));
411 task.tf_flags = IDE_TFLAG_IN_DEVICE;
412
413 drive->hwif->tp_ops->tf_read(drive, &task);
414
415 return task.tf.device;
416 }
417
418 /**
419 * do_probe - probe an IDE device
420 * @drive: drive to probe
421 * @cmd: command to use
422 *
423 * do_probe() has the difficult job of finding a drive if it exists,
424 * without getting hung up if it doesn't exist, without trampling on
425 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
426 *
427 * If a drive is "known" to exist (from CMOS or kernel parameters),
428 * but does not respond right away, the probe will "hang in there"
429 * for the maximum wait time (about 30 seconds), otherwise it will
430 * exit much more quickly.
431 *
432 * Returns: 0 device was identified
433 * 1 device timed-out (no response to identify request)
434 * 2 device aborted the command (refused to identify itself)
435 * 3 bad status from device (possible for ATAPI drives)
436 * 4 probe was not attempted because failure was obvious
437 */
438
do_probe(ide_drive_t * drive,u8 cmd)439 static int do_probe (ide_drive_t *drive, u8 cmd)
440 {
441 ide_hwif_t *hwif = drive->hwif;
442 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
443 int rc;
444 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
445
446 /* avoid waiting for inappropriate probes */
447 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
448 return 4;
449
450 #ifdef DEBUG
451 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
452 drive->name, present, drive->media,
453 (cmd == ATA_CMD_ID_ATA) ? "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 && present == 0) {
464 if (drive->dn & 1) {
465 /* exit with drive0 selected */
466 SELECT_DRIVE(hwif->devices[0]);
467 /* allow ATA_BUSY 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, ATA_DRDY, ATA_BUSY) ||
477 present || cmd == ATA_CMD_ID_ATAPI) {
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 == (ATA_BUSY | ATA_DRDY))
487 return 4;
488
489 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
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, ATA_CMD_DEV_RESET);
496 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
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->dn & 1) {
511 /* exit with drive0 selected */
512 SELECT_DRIVE(hwif->devices[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 */
enable_nest(ide_drive_t * drive)523 static void enable_nest (ide_drive_t *drive)
524 {
525 ide_hwif_t *hwif = drive->hwif;
526 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
527 u8 stat;
528
529 printk(KERN_INFO "%s: enabling %s -- ",
530 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
531
532 SELECT_DRIVE(drive);
533 msleep(50);
534 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
535
536 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
537 printk(KERN_CONT "failed (timeout)\n");
538 return;
539 }
540
541 msleep(50);
542
543 stat = tp_ops->read_status(hwif);
544
545 if (!OK_STAT(stat, 0, BAD_STAT))
546 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
547 else
548 printk(KERN_CONT "success\n");
549 }
550
551 /**
552 * probe_for_drives - upper level drive probe
553 * @drive: drive to probe for
554 *
555 * probe_for_drive() tests for existence of a given drive using do_probe()
556 * and presents things to the user as needed.
557 *
558 * Returns: 0 no device was found
559 * 1 device was found
560 * (note: IDE_DFLAG_PRESENT might still be not set)
561 */
562
probe_for_drive(ide_drive_t * drive)563 static u8 probe_for_drive(ide_drive_t *drive)
564 {
565 char *m;
566
567 /*
568 * In order to keep things simple we have an id
569 * block for all drives at all times. If the device
570 * is pre ATA or refuses ATA/ATAPI identify we
571 * will add faked data to this.
572 *
573 * Also note that 0 everywhere means "can't do X"
574 */
575
576 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
577
578 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
579 if (drive->id == NULL) {
580 printk(KERN_ERR "ide: out of memory for id data.\n");
581 return 0;
582 }
583
584 m = (char *)&drive->id[ATA_ID_PROD];
585 strcpy(m, "UNKNOWN");
586
587 /* skip probing? */
588 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
589 retry:
590 /* if !(success||timed-out) */
591 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
592 /* look for ATAPI device */
593 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
594
595 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
596 /* drive not found */
597 return 0;
598
599 if (strstr(m, "E X A B Y T E N E S T")) {
600 enable_nest(drive);
601 goto retry;
602 }
603
604 /* identification failed? */
605 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
606 if (drive->media == ide_disk) {
607 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
608 drive->name, drive->cyl,
609 drive->head, drive->sect);
610 } else if (drive->media == ide_cdrom) {
611 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
612 } else {
613 /* nuke it */
614 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
615 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
616 }
617 }
618 /* drive was found */
619 }
620
621 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
622 return 0;
623
624 /* The drive wasn't being helpful. Add generic info only */
625 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
626 generic_id(drive);
627 return 1;
628 }
629
630 if (drive->media == ide_disk) {
631 ide_disk_init_chs(drive);
632 ide_disk_init_mult_count(drive);
633 }
634
635 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
636 }
637
hwif_release_dev(struct device * dev)638 static void hwif_release_dev(struct device *dev)
639 {
640 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
641
642 complete(&hwif->gendev_rel_comp);
643 }
644
ide_register_port(ide_hwif_t * hwif)645 static int ide_register_port(ide_hwif_t *hwif)
646 {
647 int ret;
648
649 /* register with global device tree */
650 dev_set_name(&hwif->gendev, hwif->name);
651 hwif->gendev.driver_data = hwif;
652 if (hwif->gendev.parent == NULL)
653 hwif->gendev.parent = hwif->dev;
654 hwif->gendev.release = hwif_release_dev;
655
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(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
ide_port_wait_ready(ide_hwif_t * hwif)699 static int ide_port_wait_ready(ide_hwif_t *hwif)
700 {
701 ide_drive_t *drive;
702 int i, rc;
703
704 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
705
706 /* Let HW settle down a bit from whatever init state we
707 * come from */
708 mdelay(2);
709
710 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
711 * I know of at least one disk who takes 31 seconds, I use 35
712 * here to be safe
713 */
714 rc = ide_wait_not_busy(hwif, 35000);
715 if (rc)
716 return rc;
717
718 /* Now make sure both master & slave are ready */
719 ide_port_for_each_dev(i, drive, hwif) {
720 /* Ignore disks that we will not probe for later. */
721 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
722 (drive->dev_flags & IDE_DFLAG_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 (i)
736 SELECT_DRIVE(hwif->devices[0]);
737
738 return rc;
739 }
740
741 /**
742 * ide_undecoded_slave - look for bad CF adapters
743 * @dev1: slave device
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
ide_undecoded_slave(ide_drive_t * dev1)750 void ide_undecoded_slave(ide_drive_t *dev1)
751 {
752 ide_drive_t *dev0 = dev1->hwif->devices[0];
753
754 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
755 return;
756
757 /* If the models don't match they are not the same product */
758 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
759 (char *)&dev1->id[ATA_ID_PROD]))
760 return;
761
762 /* Serial numbers do not match */
763 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
764 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
765 return;
766
767 /* No serial number, thankfully very rare for CF */
768 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
769 return;
770
771 /* Appears to be an IDE flash adapter with decode bugs */
772 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
773
774 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
775 }
776
777 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
778
ide_probe_port(ide_hwif_t * hwif)779 static int ide_probe_port(ide_hwif_t *hwif)
780 {
781 ide_drive_t *drive;
782 unsigned long flags;
783 unsigned int irqd;
784 int i, rc = -ENODEV;
785
786 BUG_ON(hwif->present);
787
788 if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
789 (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
790 return -EACCES;
791
792 /*
793 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
794 * we'll install our IRQ driver much later...
795 */
796 irqd = hwif->irq;
797 if (irqd)
798 disable_irq(hwif->irq);
799
800 local_save_flags(flags);
801 local_irq_enable_in_hardirq();
802
803 if (ide_port_wait_ready(hwif) == -EBUSY)
804 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
805
806 /*
807 * Second drive should only exist if first drive was found,
808 * but a lot of cdrom drives are configured as single slaves.
809 */
810 ide_port_for_each_dev(i, drive, hwif) {
811 (void) probe_for_drive(drive);
812 if (drive->dev_flags & IDE_DFLAG_PRESENT)
813 rc = 0;
814 }
815
816 local_irq_restore(flags);
817
818 /*
819 * Use cached IRQ number. It might be (and is...) changed by probe
820 * code above
821 */
822 if (irqd)
823 enable_irq(irqd);
824
825 return rc;
826 }
827
ide_port_tune_devices(ide_hwif_t * hwif)828 static void ide_port_tune_devices(ide_hwif_t *hwif)
829 {
830 const struct ide_port_ops *port_ops = hwif->port_ops;
831 ide_drive_t *drive;
832 int i;
833
834 ide_port_for_each_dev(i, drive, hwif) {
835 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
836 if (port_ops && port_ops->quirkproc)
837 port_ops->quirkproc(drive);
838 }
839 }
840
841 ide_port_for_each_dev(i, drive, hwif) {
842 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
843 ide_set_max_pio(drive);
844
845 drive->dev_flags |= IDE_DFLAG_NICE1;
846
847 if (hwif->dma_ops)
848 ide_set_dma(drive);
849 }
850 }
851
852 ide_port_for_each_dev(i, drive, hwif) {
853 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
854 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
855 else
856 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
857 }
858 }
859
860 /*
861 * init request queue
862 */
ide_init_queue(ide_drive_t * drive)863 static int ide_init_queue(ide_drive_t *drive)
864 {
865 struct request_queue *q;
866 ide_hwif_t *hwif = drive->hwif;
867 int max_sectors = 256;
868 int max_sg_entries = PRD_ENTRIES;
869
870 /*
871 * Our default set up assumes the normal IDE case,
872 * that is 64K segmenting, standard PRD setup
873 * and LBA28. Some drivers then impose their own
874 * limits and LBA48 we could raise it but as yet
875 * do not.
876 */
877
878 q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
879 if (!q)
880 return 1;
881
882 q->queuedata = drive;
883 blk_queue_segment_boundary(q, 0xffff);
884
885 if (hwif->rqsize < max_sectors)
886 max_sectors = hwif->rqsize;
887 blk_queue_max_sectors(q, max_sectors);
888
889 #ifdef CONFIG_PCI
890 /* When we have an IOMMU, we may have a problem where pci_map_sg()
891 * creates segments that don't completely match our boundary
892 * requirements and thus need to be broken up again. Because it
893 * doesn't align properly either, we may actually have to break up
894 * to more segments than what was we got in the first place, a max
895 * worst case is twice as many.
896 * This will be fixed once we teach pci_map_sg() about our boundary
897 * requirements, hopefully soon. *FIXME*
898 */
899 if (!PCI_DMA_BUS_IS_PHYS)
900 max_sg_entries >>= 1;
901 #endif /* CONFIG_PCI */
902
903 blk_queue_max_hw_segments(q, max_sg_entries);
904 blk_queue_max_phys_segments(q, max_sg_entries);
905
906 /* assign drive queue */
907 drive->queue = q;
908
909 /* needs drive->queue to be set */
910 ide_toggle_bounce(drive, 1);
911
912 return 0;
913 }
914
915 static DEFINE_MUTEX(ide_cfg_mtx);
916
917 /*
918 * For any present drive:
919 * - allocate the block device queue
920 */
ide_port_setup_devices(ide_hwif_t * hwif)921 static int ide_port_setup_devices(ide_hwif_t *hwif)
922 {
923 ide_drive_t *drive;
924 int i, j = 0;
925
926 mutex_lock(&ide_cfg_mtx);
927 ide_port_for_each_dev(i, drive, hwif) {
928 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
929 continue;
930
931 if (ide_init_queue(drive)) {
932 printk(KERN_ERR "ide: failed to init %s\n",
933 drive->name);
934 kfree(drive->id);
935 drive->id = NULL;
936 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
937 continue;
938 }
939
940 j++;
941 }
942 mutex_unlock(&ide_cfg_mtx);
943
944 return j;
945 }
946
947 /*
948 * This routine sets up the IRQ for an IDE interface.
949 */
init_irq(ide_hwif_t * hwif)950 static int init_irq (ide_hwif_t *hwif)
951 {
952 struct ide_io_ports *io_ports = &hwif->io_ports;
953 irq_handler_t irq_handler;
954 int sa = 0;
955
956 mutex_lock(&ide_cfg_mtx);
957 spin_lock_init(&hwif->lock);
958
959 init_timer(&hwif->timer);
960 hwif->timer.function = &ide_timer_expiry;
961 hwif->timer.data = (unsigned long)hwif;
962
963 irq_handler = hwif->host->irq_handler;
964 if (irq_handler == NULL)
965 irq_handler = ide_intr;
966
967 #if defined(__mc68000__)
968 sa = IRQF_SHARED;
969 #endif /* __mc68000__ */
970
971 if (hwif->chipset == ide_pci)
972 sa = IRQF_SHARED;
973
974 if (io_ports->ctl_addr)
975 hwif->tp_ops->set_irq(hwif, 1);
976
977 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
978 goto out_up;
979
980 if (!hwif->rqsize) {
981 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
982 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
983 hwif->rqsize = 256;
984 else
985 hwif->rqsize = 65536;
986 }
987
988 #if !defined(__mc68000__)
989 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
990 io_ports->data_addr, io_ports->status_addr,
991 io_ports->ctl_addr, hwif->irq);
992 #else
993 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
994 io_ports->data_addr, hwif->irq);
995 #endif /* __mc68000__ */
996 if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
997 printk(KERN_CONT " (serialized)");
998 printk(KERN_CONT "\n");
999
1000 mutex_unlock(&ide_cfg_mtx);
1001 return 0;
1002 out_up:
1003 mutex_unlock(&ide_cfg_mtx);
1004 return 1;
1005 }
1006
ata_lock(dev_t dev,void * data)1007 static int ata_lock(dev_t dev, void *data)
1008 {
1009 /* FIXME: we want to pin hwif down */
1010 return 0;
1011 }
1012
ata_probe(dev_t dev,int * part,void * data)1013 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1014 {
1015 ide_hwif_t *hwif = data;
1016 int unit = *part >> PARTN_BITS;
1017 ide_drive_t *drive = hwif->devices[unit];
1018
1019 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1020 return NULL;
1021
1022 if (drive->media == ide_disk)
1023 request_module("ide-disk");
1024 if (drive->media == ide_cdrom || drive->media == ide_optical)
1025 request_module("ide-cd");
1026 if (drive->media == ide_tape)
1027 request_module("ide-tape");
1028 if (drive->media == ide_floppy)
1029 request_module("ide-floppy");
1030
1031 return NULL;
1032 }
1033
exact_match(dev_t dev,int * part,void * data)1034 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1035 {
1036 struct gendisk *p = data;
1037 *part &= (1 << PARTN_BITS) - 1;
1038 return &disk_to_dev(p)->kobj;
1039 }
1040
exact_lock(dev_t dev,void * data)1041 static int exact_lock(dev_t dev, void *data)
1042 {
1043 struct gendisk *p = data;
1044
1045 if (!get_disk(p))
1046 return -1;
1047 return 0;
1048 }
1049
ide_register_region(struct gendisk * disk)1050 void ide_register_region(struct gendisk *disk)
1051 {
1052 blk_register_region(MKDEV(disk->major, disk->first_minor),
1053 disk->minors, NULL, exact_match, exact_lock, disk);
1054 }
1055
1056 EXPORT_SYMBOL_GPL(ide_register_region);
1057
ide_unregister_region(struct gendisk * disk)1058 void ide_unregister_region(struct gendisk *disk)
1059 {
1060 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1061 disk->minors);
1062 }
1063
1064 EXPORT_SYMBOL_GPL(ide_unregister_region);
1065
ide_init_disk(struct gendisk * disk,ide_drive_t * drive)1066 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1067 {
1068 ide_hwif_t *hwif = drive->hwif;
1069 unsigned int unit = drive->dn & 1;
1070
1071 disk->major = hwif->major;
1072 disk->first_minor = unit << PARTN_BITS;
1073 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1074 disk->queue = drive->queue;
1075 }
1076
1077 EXPORT_SYMBOL_GPL(ide_init_disk);
1078
drive_release_dev(struct device * dev)1079 static void drive_release_dev (struct device *dev)
1080 {
1081 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1082 ide_hwif_t *hwif = drive->hwif;
1083
1084 ide_proc_unregister_device(drive);
1085
1086 spin_lock_irq(&hwif->lock);
1087 kfree(drive->id);
1088 drive->id = NULL;
1089 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1090 /* Messed up locking ... */
1091 spin_unlock_irq(&hwif->lock);
1092 blk_cleanup_queue(drive->queue);
1093 spin_lock_irq(&hwif->lock);
1094 drive->queue = NULL;
1095 spin_unlock_irq(&hwif->lock);
1096
1097 complete(&drive->gendev_rel_comp);
1098 }
1099
hwif_init(ide_hwif_t * hwif)1100 static int hwif_init(ide_hwif_t *hwif)
1101 {
1102 int old_irq;
1103
1104 if (!hwif->irq) {
1105 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1106 if (!hwif->irq) {
1107 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1108 return 0;
1109 }
1110 }
1111
1112 if (register_blkdev(hwif->major, hwif->name))
1113 return 0;
1114
1115 if (!hwif->sg_max_nents)
1116 hwif->sg_max_nents = PRD_ENTRIES;
1117
1118 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1119 GFP_KERNEL);
1120 if (!hwif->sg_table) {
1121 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1122 goto out;
1123 }
1124
1125 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1126
1127 if (init_irq(hwif) == 0)
1128 goto done;
1129
1130 old_irq = hwif->irq;
1131 /*
1132 * It failed to initialise. Find the default IRQ for
1133 * this port and try that.
1134 */
1135 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1136 if (!hwif->irq) {
1137 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1138 hwif->name, old_irq);
1139 goto out;
1140 }
1141 if (init_irq(hwif)) {
1142 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1143 hwif->name, old_irq, hwif->irq);
1144 goto out;
1145 }
1146 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1147 hwif->name, hwif->irq);
1148
1149 done:
1150 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1151 THIS_MODULE, ata_probe, ata_lock, hwif);
1152 return 1;
1153
1154 out:
1155 unregister_blkdev(hwif->major, hwif->name);
1156 return 0;
1157 }
1158
hwif_register_devices(ide_hwif_t * hwif)1159 static void hwif_register_devices(ide_hwif_t *hwif)
1160 {
1161 ide_drive_t *drive;
1162 unsigned int i;
1163
1164 ide_port_for_each_dev(i, drive, hwif) {
1165 struct device *dev = &drive->gendev;
1166 int ret;
1167
1168 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1169 continue;
1170
1171 dev_set_name(dev, "%u.%u", hwif->index, i);
1172 dev->parent = &hwif->gendev;
1173 dev->bus = &ide_bus_type;
1174 dev->driver_data = drive;
1175 dev->release = drive_release_dev;
1176
1177 ret = device_register(dev);
1178 if (ret < 0)
1179 printk(KERN_WARNING "IDE: %s: device_register error: "
1180 "%d\n", __func__, ret);
1181 }
1182 }
1183
ide_port_init_devices(ide_hwif_t * hwif)1184 static void ide_port_init_devices(ide_hwif_t *hwif)
1185 {
1186 const struct ide_port_ops *port_ops = hwif->port_ops;
1187 ide_drive_t *drive;
1188 int i;
1189
1190 ide_port_for_each_dev(i, drive, hwif) {
1191 drive->dn = i + hwif->channel * 2;
1192
1193 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1194 drive->io_32bit = 1;
1195 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1196 drive->dev_flags |= IDE_DFLAG_UNMASK;
1197 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1198 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1199
1200 if (port_ops && port_ops->init_dev)
1201 port_ops->init_dev(drive);
1202 }
1203 }
1204
ide_init_port(ide_hwif_t * hwif,unsigned int port,const struct ide_port_info * d)1205 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1206 const struct ide_port_info *d)
1207 {
1208 hwif->channel = port;
1209
1210 if (d->chipset)
1211 hwif->chipset = d->chipset;
1212
1213 if (d->init_iops)
1214 d->init_iops(hwif);
1215
1216 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1217 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1218 hwif->irq = port ? 15 : 14;
1219
1220 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1221 hwif->host_flags |= d->host_flags;
1222 hwif->pio_mask = d->pio_mask;
1223
1224 if (d->tp_ops)
1225 hwif->tp_ops = d->tp_ops;
1226
1227 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1228 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1229 hwif->port_ops = d->port_ops;
1230
1231 hwif->swdma_mask = d->swdma_mask;
1232 hwif->mwdma_mask = d->mwdma_mask;
1233 hwif->ultra_mask = d->udma_mask;
1234
1235 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1236 int rc;
1237
1238 hwif->dma_ops = d->dma_ops;
1239
1240 if (d->init_dma)
1241 rc = d->init_dma(hwif, d);
1242 else
1243 rc = ide_hwif_setup_dma(hwif, d);
1244
1245 if (rc < 0) {
1246 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1247
1248 hwif->dma_ops = NULL;
1249 hwif->dma_base = 0;
1250 hwif->swdma_mask = 0;
1251 hwif->mwdma_mask = 0;
1252 hwif->ultra_mask = 0;
1253 }
1254 }
1255
1256 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1257 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1258 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1259
1260 if (d->max_sectors)
1261 hwif->rqsize = d->max_sectors;
1262
1263 /* call chipset specific routine for each enabled port */
1264 if (d->init_hwif)
1265 d->init_hwif(hwif);
1266 }
1267
ide_port_cable_detect(ide_hwif_t * hwif)1268 static void ide_port_cable_detect(ide_hwif_t *hwif)
1269 {
1270 const struct ide_port_ops *port_ops = hwif->port_ops;
1271
1272 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1273 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1274 hwif->cbl = port_ops->cable_detect(hwif);
1275 }
1276 }
1277
1278 static const u8 ide_hwif_to_major[] =
1279 { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1280 IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1281
ide_port_init_devices_data(ide_hwif_t * hwif)1282 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1283 {
1284 ide_drive_t *drive;
1285 int i;
1286
1287 ide_port_for_each_dev(i, drive, hwif) {
1288 u8 j = (hwif->index * MAX_DRIVES) + i;
1289
1290 memset(drive, 0, sizeof(*drive));
1291
1292 drive->media = ide_disk;
1293 drive->select = (i << 4) | ATA_DEVICE_OBS;
1294 drive->hwif = hwif;
1295 drive->ready_stat = ATA_DRDY;
1296 drive->bad_wstat = BAD_W_STAT;
1297 drive->special.b.recalibrate = 1;
1298 drive->special.b.set_geometry = 1;
1299 drive->name[0] = 'h';
1300 drive->name[1] = 'd';
1301 drive->name[2] = 'a' + j;
1302 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
1303
1304 INIT_LIST_HEAD(&drive->list);
1305 init_completion(&drive->gendev_rel_comp);
1306 }
1307 }
1308
ide_init_port_data(ide_hwif_t * hwif,unsigned int index)1309 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1310 {
1311 /* fill in any non-zero initial values */
1312 hwif->index = index;
1313 hwif->major = ide_hwif_to_major[index];
1314
1315 hwif->name[0] = 'i';
1316 hwif->name[1] = 'd';
1317 hwif->name[2] = 'e';
1318 hwif->name[3] = '0' + index;
1319
1320 init_completion(&hwif->gendev_rel_comp);
1321
1322 hwif->tp_ops = &default_tp_ops;
1323
1324 ide_port_init_devices_data(hwif);
1325 }
1326
ide_init_port_hw(ide_hwif_t * hwif,hw_regs_t * hw)1327 static void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
1328 {
1329 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1330 hwif->irq = hw->irq;
1331 hwif->chipset = hw->chipset;
1332 hwif->dev = hw->dev;
1333 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1334 hwif->ack_intr = hw->ack_intr;
1335 hwif->config_data = hw->config;
1336 }
1337
1338 static unsigned int ide_indexes;
1339
1340 /**
1341 * ide_find_port_slot - find free port slot
1342 * @d: IDE port info
1343 *
1344 * Return the new port slot index or -ENOENT if we are out of free slots.
1345 */
1346
ide_find_port_slot(const struct ide_port_info * d)1347 static int ide_find_port_slot(const struct ide_port_info *d)
1348 {
1349 int idx = -ENOENT;
1350 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1351 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1352
1353 /*
1354 * Claim an unassigned slot.
1355 *
1356 * Give preference to claiming other slots before claiming ide0/ide1,
1357 * just in case there's another interface yet-to-be-scanned
1358 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1359 *
1360 * Unless there is a bootable card that does not use the standard
1361 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1362 */
1363 mutex_lock(&ide_cfg_mtx);
1364 if (bootable) {
1365 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1366 idx = ffz(ide_indexes | i);
1367 } else {
1368 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1369 idx = ffz(ide_indexes | 3);
1370 else if ((ide_indexes & 3) != 3)
1371 idx = ffz(ide_indexes);
1372 }
1373 if (idx >= 0)
1374 ide_indexes |= (1 << idx);
1375 mutex_unlock(&ide_cfg_mtx);
1376
1377 return idx;
1378 }
1379
ide_free_port_slot(int idx)1380 static void ide_free_port_slot(int idx)
1381 {
1382 mutex_lock(&ide_cfg_mtx);
1383 ide_indexes &= ~(1 << idx);
1384 mutex_unlock(&ide_cfg_mtx);
1385 }
1386
ide_port_free_devices(ide_hwif_t * hwif)1387 static void ide_port_free_devices(ide_hwif_t *hwif)
1388 {
1389 ide_drive_t *drive;
1390 int i;
1391
1392 ide_port_for_each_dev(i, drive, hwif)
1393 kfree(drive);
1394 }
1395
ide_port_alloc_devices(ide_hwif_t * hwif,int node)1396 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1397 {
1398 int i;
1399
1400 for (i = 0; i < MAX_DRIVES; i++) {
1401 ide_drive_t *drive;
1402
1403 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1404 if (drive == NULL)
1405 goto out_nomem;
1406
1407 hwif->devices[i] = drive;
1408 }
1409 return 0;
1410
1411 out_nomem:
1412 ide_port_free_devices(hwif);
1413 return -ENOMEM;
1414 }
1415
ide_host_alloc(const struct ide_port_info * d,hw_regs_t ** hws)1416 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1417 {
1418 struct ide_host *host;
1419 struct device *dev = hws[0] ? hws[0]->dev : NULL;
1420 int node = dev ? dev_to_node(dev) : -1;
1421 int i;
1422
1423 host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1424 if (host == NULL)
1425 return NULL;
1426
1427 for (i = 0; i < MAX_HOST_PORTS; i++) {
1428 ide_hwif_t *hwif;
1429 int idx;
1430
1431 if (hws[i] == NULL)
1432 continue;
1433
1434 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1435 if (hwif == NULL)
1436 continue;
1437
1438 if (ide_port_alloc_devices(hwif, node) < 0) {
1439 kfree(hwif);
1440 continue;
1441 }
1442
1443 idx = ide_find_port_slot(d);
1444 if (idx < 0) {
1445 printk(KERN_ERR "%s: no free slot for interface\n",
1446 d ? d->name : "ide");
1447 kfree(hwif);
1448 continue;
1449 }
1450
1451 ide_init_port_data(hwif, idx);
1452
1453 hwif->host = host;
1454
1455 host->ports[i] = hwif;
1456 host->n_ports++;
1457 }
1458
1459 if (host->n_ports == 0) {
1460 kfree(host);
1461 return NULL;
1462 }
1463
1464 host->dev[0] = dev;
1465
1466 if (d) {
1467 host->init_chipset = d->init_chipset;
1468 host->host_flags = d->host_flags;
1469 }
1470
1471 return host;
1472 }
1473 EXPORT_SYMBOL_GPL(ide_host_alloc);
1474
ide_port_free(ide_hwif_t * hwif)1475 static void ide_port_free(ide_hwif_t *hwif)
1476 {
1477 ide_port_free_devices(hwif);
1478 ide_free_port_slot(hwif->index);
1479 kfree(hwif);
1480 }
1481
ide_disable_port(ide_hwif_t * hwif)1482 static void ide_disable_port(ide_hwif_t *hwif)
1483 {
1484 struct ide_host *host = hwif->host;
1485 int i;
1486
1487 printk(KERN_INFO "%s: disabling port\n", hwif->name);
1488
1489 for (i = 0; i < MAX_HOST_PORTS; i++) {
1490 if (host->ports[i] == hwif) {
1491 host->ports[i] = NULL;
1492 host->n_ports--;
1493 }
1494 }
1495
1496 ide_port_free(hwif);
1497 }
1498
ide_host_register(struct ide_host * host,const struct ide_port_info * d,hw_regs_t ** hws)1499 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1500 hw_regs_t **hws)
1501 {
1502 ide_hwif_t *hwif, *mate = NULL;
1503 int i, j = 0;
1504
1505 ide_host_for_each_port(i, hwif, host) {
1506 if (hwif == NULL) {
1507 mate = NULL;
1508 continue;
1509 }
1510
1511 ide_init_port_hw(hwif, hws[i]);
1512 ide_port_apply_params(hwif);
1513
1514 if (d == NULL) {
1515 mate = NULL;
1516 } else {
1517 if ((i & 1) && mate) {
1518 hwif->mate = mate;
1519 mate->mate = hwif;
1520 }
1521
1522 mate = (i & 1) ? NULL : hwif;
1523
1524 ide_init_port(hwif, i & 1, d);
1525 ide_port_cable_detect(hwif);
1526 }
1527
1528 ide_port_init_devices(hwif);
1529 }
1530
1531 ide_host_for_each_port(i, hwif, host) {
1532 if (hwif == NULL)
1533 continue;
1534
1535 if (ide_probe_port(hwif) == 0)
1536 hwif->present = 1;
1537
1538 if (hwif->chipset != ide_4drives || !hwif->mate ||
1539 !hwif->mate->present) {
1540 if (ide_register_port(hwif)) {
1541 ide_disable_port(hwif);
1542 continue;
1543 }
1544 }
1545
1546 if (hwif->present)
1547 ide_port_tune_devices(hwif);
1548 }
1549
1550 ide_host_for_each_port(i, hwif, host) {
1551 if (hwif == NULL)
1552 continue;
1553
1554 if (hwif_init(hwif) == 0) {
1555 printk(KERN_INFO "%s: failed to initialize IDE "
1556 "interface\n", hwif->name);
1557 device_unregister(&hwif->gendev);
1558 ide_disable_port(hwif);
1559 continue;
1560 }
1561
1562 if (hwif->present)
1563 if (ide_port_setup_devices(hwif) == 0) {
1564 hwif->present = 0;
1565 continue;
1566 }
1567
1568 j++;
1569
1570 ide_acpi_init(hwif);
1571
1572 if (hwif->present)
1573 ide_acpi_port_init_devices(hwif);
1574 }
1575
1576 ide_host_for_each_port(i, hwif, host) {
1577 if (hwif == NULL)
1578 continue;
1579
1580 if (hwif->present)
1581 hwif_register_devices(hwif);
1582 }
1583
1584 ide_host_for_each_port(i, hwif, host) {
1585 if (hwif == NULL)
1586 continue;
1587
1588 ide_sysfs_register_port(hwif);
1589 ide_proc_register_port(hwif);
1590
1591 if (hwif->present)
1592 ide_proc_port_register_devices(hwif);
1593 }
1594
1595 return j ? 0 : -1;
1596 }
1597 EXPORT_SYMBOL_GPL(ide_host_register);
1598
ide_host_add(const struct ide_port_info * d,hw_regs_t ** hws,struct ide_host ** hostp)1599 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1600 struct ide_host **hostp)
1601 {
1602 struct ide_host *host;
1603 int rc;
1604
1605 host = ide_host_alloc(d, hws);
1606 if (host == NULL)
1607 return -ENOMEM;
1608
1609 rc = ide_host_register(host, d, hws);
1610 if (rc) {
1611 ide_host_free(host);
1612 return rc;
1613 }
1614
1615 if (hostp)
1616 *hostp = host;
1617
1618 return 0;
1619 }
1620 EXPORT_SYMBOL_GPL(ide_host_add);
1621
__ide_port_unregister_devices(ide_hwif_t * hwif)1622 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1623 {
1624 ide_drive_t *drive;
1625 int i;
1626
1627 ide_port_for_each_dev(i, drive, hwif) {
1628 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
1629 device_unregister(&drive->gendev);
1630 wait_for_completion(&drive->gendev_rel_comp);
1631 }
1632 }
1633 }
1634
ide_port_unregister_devices(ide_hwif_t * hwif)1635 void ide_port_unregister_devices(ide_hwif_t *hwif)
1636 {
1637 mutex_lock(&ide_cfg_mtx);
1638 __ide_port_unregister_devices(hwif);
1639 hwif->present = 0;
1640 ide_port_init_devices_data(hwif);
1641 mutex_unlock(&ide_cfg_mtx);
1642 }
1643 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1644
1645 /**
1646 * ide_unregister - free an IDE interface
1647 * @hwif: IDE interface
1648 *
1649 * Perform the final unregister of an IDE interface.
1650 *
1651 * Locking:
1652 * The caller must not hold the IDE locks.
1653 *
1654 * It is up to the caller to be sure there is no pending I/O here,
1655 * and that the interface will not be reopened (present/vanishing
1656 * locking isn't yet done BTW).
1657 */
1658
ide_unregister(ide_hwif_t * hwif)1659 static void ide_unregister(ide_hwif_t *hwif)
1660 {
1661 BUG_ON(in_interrupt());
1662 BUG_ON(irqs_disabled());
1663
1664 mutex_lock(&ide_cfg_mtx);
1665
1666 if (hwif->present) {
1667 __ide_port_unregister_devices(hwif);
1668 hwif->present = 0;
1669 }
1670
1671 ide_proc_unregister_port(hwif);
1672
1673 free_irq(hwif->irq, hwif);
1674
1675 device_unregister(hwif->portdev);
1676 device_unregister(&hwif->gendev);
1677 wait_for_completion(&hwif->gendev_rel_comp);
1678
1679 /*
1680 * Remove us from the kernel's knowledge
1681 */
1682 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1683 kfree(hwif->sg_table);
1684 unregister_blkdev(hwif->major, hwif->name);
1685
1686 ide_release_dma_engine(hwif);
1687
1688 mutex_unlock(&ide_cfg_mtx);
1689 }
1690
ide_host_free(struct ide_host * host)1691 void ide_host_free(struct ide_host *host)
1692 {
1693 ide_hwif_t *hwif;
1694 int i;
1695
1696 ide_host_for_each_port(i, hwif, host) {
1697 if (hwif)
1698 ide_port_free(hwif);
1699 }
1700
1701 kfree(host);
1702 }
1703 EXPORT_SYMBOL_GPL(ide_host_free);
1704
ide_host_remove(struct ide_host * host)1705 void ide_host_remove(struct ide_host *host)
1706 {
1707 ide_hwif_t *hwif;
1708 int i;
1709
1710 ide_host_for_each_port(i, hwif, host) {
1711 if (hwif)
1712 ide_unregister(hwif);
1713 }
1714
1715 ide_host_free(host);
1716 }
1717 EXPORT_SYMBOL_GPL(ide_host_remove);
1718
ide_port_scan(ide_hwif_t * hwif)1719 void ide_port_scan(ide_hwif_t *hwif)
1720 {
1721 ide_port_apply_params(hwif);
1722 ide_port_cable_detect(hwif);
1723 ide_port_init_devices(hwif);
1724
1725 if (ide_probe_port(hwif) < 0)
1726 return;
1727
1728 hwif->present = 1;
1729
1730 ide_port_tune_devices(hwif);
1731 ide_port_setup_devices(hwif);
1732 ide_acpi_port_init_devices(hwif);
1733 hwif_register_devices(hwif);
1734 ide_proc_port_register_devices(hwif);
1735 }
1736 EXPORT_SYMBOL_GPL(ide_port_scan);
1737