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ide: replace the global ide_lock spinlock by per-hwgroup spinlocks (v2)
[mirror_ubuntu-bionic-kernel.git] / drivers / ide / ide-probe.c
1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
10 *
11 * See linux/MAINTAINERS for address of current maintainer.
12 *
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
14 *
15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16 * by Andrea Arcangeli
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
45 *
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
49 */
50
51 static void generic_id(ide_drive_t *drive)
52 {
53 u16 *id = drive->id;
54
55 id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
56 id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
57 id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
58 }
59
60 static void ide_disk_init_chs(ide_drive_t *drive)
61 {
62 u16 *id = drive->id;
63
64 /* Extract geometry if we did not already have one for the drive */
65 if (!drive->cyl || !drive->head || !drive->sect) {
66 drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS];
67 drive->head = drive->bios_head = id[ATA_ID_HEADS];
68 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
69 }
70
71 /* Handle logical geometry translation by the drive */
72 if (ata_id_current_chs_valid(id)) {
73 drive->cyl = id[ATA_ID_CUR_CYLS];
74 drive->head = id[ATA_ID_CUR_HEADS];
75 drive->sect = id[ATA_ID_CUR_SECTORS];
76 }
77
78 /* Use physical geometry if what we have still makes no sense */
79 if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
80 drive->cyl = id[ATA_ID_CYLS];
81 drive->head = id[ATA_ID_HEADS];
82 drive->sect = id[ATA_ID_SECTORS];
83 }
84 }
85
86 static void ide_disk_init_mult_count(ide_drive_t *drive)
87 {
88 u16 *id = drive->id;
89 u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
90
91 if (max_multsect) {
92 if ((max_multsect / 2) > 1)
93 id[ATA_ID_MULTSECT] = max_multsect | 0x100;
94 else
95 id[ATA_ID_MULTSECT] &= ~0x1ff;
96
97 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
98
99 if (drive->mult_req)
100 drive->special.b.set_multmode = 1;
101 }
102 }
103
104 /**
105 * do_identify - identify a drive
106 * @drive: drive to identify
107 * @cmd: command used
108 *
109 * Called when we have issued a drive identify command to
110 * read and parse the results. This function is run with
111 * interrupts disabled.
112 */
113
114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
115 {
116 ide_hwif_t *hwif = HWIF(drive);
117 u16 *id = drive->id;
118 char *m = (char *)&id[ATA_ID_PROD];
119 int bswap = 1, is_cfa;
120
121 /* read 512 bytes of id info */
122 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
123
124 drive->dev_flags |= IDE_DFLAG_ID_READ;
125
126 local_irq_enable();
127 #ifdef DEBUG
128 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
129 ide_dump_identify((u8 *)id);
130 #endif
131 ide_fix_driveid(id);
132
133 /*
134 * ATA_CMD_ID_ATA returns little-endian info,
135 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
136 */
137 if (cmd == ATA_CMD_ID_ATAPI) {
138 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
139 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
140 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
141 /* Vertos drives may still be weird */
142 bswap ^= 1;
143 }
144
145 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
146 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
147 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
148
149 /* we depend on this a lot! */
150 m[ATA_ID_PROD_LEN - 1] = '\0';
151
152 if (strstr(m, "E X A B Y T E N E S T"))
153 goto err_misc;
154
155 printk(KERN_INFO "%s: %s, ", drive->name, m);
156
157 drive->dev_flags |= IDE_DFLAG_PRESENT;
158 drive->dev_flags &= ~IDE_DFLAG_DEAD;
159
160 /*
161 * Check for an ATAPI device
162 */
163 if (cmd == ATA_CMD_ID_ATAPI) {
164 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
165
166 printk(KERN_CONT "ATAPI ");
167 switch (type) {
168 case ide_floppy:
169 if (!strstr(m, "CD-ROM")) {
170 if (!strstr(m, "oppy") &&
171 !strstr(m, "poyp") &&
172 !strstr(m, "ZIP"))
173 printk(KERN_CONT "cdrom or floppy?, assuming ");
174 if (drive->media != ide_cdrom) {
175 printk(KERN_CONT "FLOPPY");
176 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
177 break;
178 }
179 }
180 /* Early cdrom models used zero */
181 type = ide_cdrom;
182 case ide_cdrom:
183 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
184 #ifdef CONFIG_PPC
185 /* kludge for Apple PowerBook internal zip */
186 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
187 printk(KERN_CONT "FLOPPY");
188 type = ide_floppy;
189 break;
190 }
191 #endif
192 printk(KERN_CONT "CD/DVD-ROM");
193 break;
194 case ide_tape:
195 printk(KERN_CONT "TAPE");
196 break;
197 case ide_optical:
198 printk(KERN_CONT "OPTICAL");
199 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
200 break;
201 default:
202 printk(KERN_CONT "UNKNOWN (type %d)", type);
203 break;
204 }
205 printk(KERN_CONT " drive\n");
206 drive->media = type;
207 /* an ATAPI device ignores DRDY */
208 drive->ready_stat = 0;
209 if (ata_id_cdb_intr(id))
210 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
211 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
212 /* we don't do head unloading on ATAPI devices */
213 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
214 return;
215 }
216
217 /*
218 * Not an ATAPI device: looks like a "regular" hard disk
219 */
220
221 is_cfa = ata_id_is_cfa(id);
222
223 /* CF devices are *not* removable in Linux definition of the term */
224 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
225 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
226
227 drive->media = ide_disk;
228
229 if (!ata_id_has_unload(drive->id))
230 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
231
232 printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
233
234 return;
235
236 err_misc:
237 kfree(id);
238 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
239 return;
240 }
241
242 /**
243 * actual_try_to_identify - send ata/atapi identify
244 * @drive: drive to identify
245 * @cmd: command to use
246 *
247 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
248 * and waits for a response. It also monitors irqs while this is
249 * happening, in hope of automatically determining which one is
250 * being used by the interface.
251 *
252 * Returns: 0 device was identified
253 * 1 device timed-out (no response to identify request)
254 * 2 device aborted the command (refused to identify itself)
255 */
256
257 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
258 {
259 ide_hwif_t *hwif = HWIF(drive);
260 struct ide_io_ports *io_ports = &hwif->io_ports;
261 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
262 int use_altstatus = 0, rc;
263 unsigned long timeout;
264 u8 s = 0, a = 0;
265
266 /* take a deep breath */
267 msleep(50);
268
269 if (io_ports->ctl_addr &&
270 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
271 a = tp_ops->read_altstatus(hwif);
272 s = tp_ops->read_status(hwif);
273 if ((a ^ s) & ~ATA_IDX)
274 /* ancient Seagate drives, broken interfaces */
275 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
276 "instead of ALTSTATUS(0x%02x)\n",
277 drive->name, s, a);
278 else
279 /* use non-intrusive polling */
280 use_altstatus = 1;
281 }
282
283 /* set features register for atapi
284 * identify command to be sure of reply
285 */
286 if (cmd == ATA_CMD_ID_ATAPI) {
287 ide_task_t task;
288
289 memset(&task, 0, sizeof(task));
290 /* disable DMA & overlap */
291 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
292
293 tp_ops->tf_load(drive, &task);
294 }
295
296 /* ask drive for ID */
297 tp_ops->exec_command(hwif, cmd);
298
299 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
300
301 if (ide_busy_sleep(hwif, timeout, use_altstatus))
302 return 1;
303
304 /* wait for IRQ and ATA_DRQ */
305 msleep(50);
306 s = tp_ops->read_status(hwif);
307
308 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
309 unsigned long flags;
310
311 /* local CPU only; some systems need this */
312 local_irq_save(flags);
313 /* drive returned ID */
314 do_identify(drive, cmd);
315 /* drive responded with ID */
316 rc = 0;
317 /* clear drive IRQ */
318 (void)tp_ops->read_status(hwif);
319 local_irq_restore(flags);
320 } else {
321 /* drive refused ID */
322 rc = 2;
323 }
324 return rc;
325 }
326
327 /**
328 * try_to_identify - try to identify a drive
329 * @drive: drive to probe
330 * @cmd: command to use
331 *
332 * Issue the identify command and then do IRQ probing to
333 * complete the identification when needed by finding the
334 * IRQ the drive is attached to
335 */
336
337 static int try_to_identify (ide_drive_t *drive, u8 cmd)
338 {
339 ide_hwif_t *hwif = HWIF(drive);
340 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
341 int retval;
342 int autoprobe = 0;
343 unsigned long cookie = 0;
344
345 /*
346 * Disable device irq unless we need to
347 * probe for it. Otherwise we'll get spurious
348 * interrupts during the identify-phase that
349 * the irq handler isn't expecting.
350 */
351 if (hwif->io_ports.ctl_addr) {
352 if (!hwif->irq) {
353 autoprobe = 1;
354 cookie = probe_irq_on();
355 }
356 tp_ops->set_irq(hwif, autoprobe);
357 }
358
359 retval = actual_try_to_identify(drive, cmd);
360
361 if (autoprobe) {
362 int irq;
363
364 tp_ops->set_irq(hwif, 0);
365 /* clear drive IRQ */
366 (void)tp_ops->read_status(hwif);
367 udelay(5);
368 irq = probe_irq_off(cookie);
369 if (!hwif->irq) {
370 if (irq > 0) {
371 hwif->irq = irq;
372 } else {
373 /* Mmmm.. multiple IRQs..
374 * don't know which was ours
375 */
376 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
377 drive->name, cookie);
378 }
379 }
380 }
381 return retval;
382 }
383
384 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
385 {
386 u8 stat;
387
388 timeout += jiffies;
389
390 do {
391 msleep(50); /* give drive a breather */
392 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
393 : hwif->tp_ops->read_status(hwif);
394 if ((stat & ATA_BUSY) == 0)
395 return 0;
396 } while (time_before(jiffies, timeout));
397
398 return 1; /* drive timed-out */
399 }
400
401 static u8 ide_read_device(ide_drive_t *drive)
402 {
403 ide_task_t task;
404
405 memset(&task, 0, sizeof(task));
406 task.tf_flags = IDE_TFLAG_IN_DEVICE;
407
408 drive->hwif->tp_ops->tf_read(drive, &task);
409
410 return task.tf.device;
411 }
412
413 /**
414 * do_probe - probe an IDE device
415 * @drive: drive to probe
416 * @cmd: command to use
417 *
418 * do_probe() has the difficult job of finding a drive if it exists,
419 * without getting hung up if it doesn't exist, without trampling on
420 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
421 *
422 * If a drive is "known" to exist (from CMOS or kernel parameters),
423 * but does not respond right away, the probe will "hang in there"
424 * for the maximum wait time (about 30 seconds), otherwise it will
425 * exit much more quickly.
426 *
427 * Returns: 0 device was identified
428 * 1 device timed-out (no response to identify request)
429 * 2 device aborted the command (refused to identify itself)
430 * 3 bad status from device (possible for ATAPI drives)
431 * 4 probe was not attempted because failure was obvious
432 */
433
434 static int do_probe (ide_drive_t *drive, u8 cmd)
435 {
436 ide_hwif_t *hwif = HWIF(drive);
437 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
438 int rc;
439 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
440
441 /* avoid waiting for inappropriate probes */
442 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
443 return 4;
444
445 #ifdef DEBUG
446 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
447 drive->name, present, drive->media,
448 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
449 #endif
450
451 /* needed for some systems
452 * (e.g. crw9624 as drive0 with disk as slave)
453 */
454 msleep(50);
455 SELECT_DRIVE(drive);
456 msleep(50);
457
458 if (ide_read_device(drive) != drive->select && present == 0) {
459 if (drive->dn & 1) {
460 /* exit with drive0 selected */
461 SELECT_DRIVE(&hwif->drives[0]);
462 /* allow ATA_BUSY to assert & clear */
463 msleep(50);
464 }
465 /* no i/f present: mmm.. this should be a 4 -ml */
466 return 3;
467 }
468
469 stat = tp_ops->read_status(hwif);
470
471 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
472 present || cmd == ATA_CMD_ID_ATAPI) {
473 /* send cmd and wait */
474 if ((rc = try_to_identify(drive, cmd))) {
475 /* failed: try again */
476 rc = try_to_identify(drive,cmd);
477 }
478
479 stat = tp_ops->read_status(hwif);
480
481 if (stat == (ATA_BUSY | ATA_DRDY))
482 return 4;
483
484 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
485 printk(KERN_ERR "%s: no response (status = 0x%02x), "
486 "resetting drive\n", drive->name, stat);
487 msleep(50);
488 SELECT_DRIVE(drive);
489 msleep(50);
490 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
491 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
492 rc = try_to_identify(drive, cmd);
493 }
494
495 /* ensure drive IRQ is clear */
496 stat = tp_ops->read_status(hwif);
497
498 if (rc == 1)
499 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
500 drive->name, stat);
501 } else {
502 /* not present or maybe ATAPI */
503 rc = 3;
504 }
505 if (drive->dn & 1) {
506 /* exit with drive0 selected */
507 SELECT_DRIVE(&hwif->drives[0]);
508 msleep(50);
509 /* ensure drive irq is clear */
510 (void)tp_ops->read_status(hwif);
511 }
512 return rc;
513 }
514
515 /*
516 *
517 */
518 static void enable_nest (ide_drive_t *drive)
519 {
520 ide_hwif_t *hwif = HWIF(drive);
521 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
522 u8 stat;
523
524 printk(KERN_INFO "%s: enabling %s -- ",
525 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
526
527 SELECT_DRIVE(drive);
528 msleep(50);
529 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
530
531 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
532 printk(KERN_CONT "failed (timeout)\n");
533 return;
534 }
535
536 msleep(50);
537
538 stat = tp_ops->read_status(hwif);
539
540 if (!OK_STAT(stat, 0, BAD_STAT))
541 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
542 else
543 printk(KERN_CONT "success\n");
544 }
545
546 /**
547 * probe_for_drives - upper level drive probe
548 * @drive: drive to probe for
549 *
550 * probe_for_drive() tests for existence of a given drive using do_probe()
551 * and presents things to the user as needed.
552 *
553 * Returns: 0 no device was found
554 * 1 device was found
555 * (note: IDE_DFLAG_PRESENT might still be not set)
556 */
557
558 static inline u8 probe_for_drive (ide_drive_t *drive)
559 {
560 char *m;
561
562 /*
563 * In order to keep things simple we have an id
564 * block for all drives at all times. If the device
565 * is pre ATA or refuses ATA/ATAPI identify we
566 * will add faked data to this.
567 *
568 * Also note that 0 everywhere means "can't do X"
569 */
570
571 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
572
573 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
574 if (drive->id == NULL) {
575 printk(KERN_ERR "ide: out of memory for id data.\n");
576 return 0;
577 }
578
579 m = (char *)&drive->id[ATA_ID_PROD];
580 strcpy(m, "UNKNOWN");
581
582 /* skip probing? */
583 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
584 retry:
585 /* if !(success||timed-out) */
586 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
587 /* look for ATAPI device */
588 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
589
590 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
591 /* drive not found */
592 return 0;
593
594 if (strstr(m, "E X A B Y T E N E S T")) {
595 enable_nest(drive);
596 goto retry;
597 }
598
599 /* identification failed? */
600 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
601 if (drive->media == ide_disk) {
602 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
603 drive->name, drive->cyl,
604 drive->head, drive->sect);
605 } else if (drive->media == ide_cdrom) {
606 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
607 } else {
608 /* nuke it */
609 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
610 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
611 }
612 }
613 /* drive was found */
614 }
615
616 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
617 return 0;
618
619 /* The drive wasn't being helpful. Add generic info only */
620 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
621 generic_id(drive);
622 return 1;
623 }
624
625 if (drive->media == ide_disk) {
626 ide_disk_init_chs(drive);
627 ide_disk_init_mult_count(drive);
628 }
629
630 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
631 }
632
633 static void hwif_release_dev(struct device *dev)
634 {
635 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
636
637 complete(&hwif->gendev_rel_comp);
638 }
639
640 static int ide_register_port(ide_hwif_t *hwif)
641 {
642 int ret;
643
644 /* register with global device tree */
645 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
646 hwif->gendev.driver_data = hwif;
647 if (hwif->gendev.parent == NULL) {
648 if (hwif->dev)
649 hwif->gendev.parent = hwif->dev;
650 else
651 /* Would like to do = &device_legacy */
652 hwif->gendev.parent = NULL;
653 }
654 hwif->gendev.release = hwif_release_dev;
655 ret = device_register(&hwif->gendev);
656 if (ret < 0) {
657 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
658 __func__, ret);
659 goto out;
660 }
661
662 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
663 MKDEV(0, 0), hwif, hwif->name);
664 if (IS_ERR(hwif->portdev)) {
665 ret = PTR_ERR(hwif->portdev);
666 device_unregister(&hwif->gendev);
667 }
668 out:
669 return ret;
670 }
671
672 /**
673 * ide_port_wait_ready - wait for port to become ready
674 * @hwif: IDE port
675 *
676 * This is needed on some PPCs and a bunch of BIOS-less embedded
677 * platforms. Typical cases are:
678 *
679 * - The firmware hard reset the disk before booting the kernel,
680 * the drive is still doing it's poweron-reset sequence, that
681 * can take up to 30 seconds.
682 *
683 * - The firmware does nothing (or no firmware), the device is
684 * still in POST state (same as above actually).
685 *
686 * - Some CD/DVD/Writer combo drives tend to drive the bus during
687 * their reset sequence even when they are non-selected slave
688 * devices, thus preventing discovery of the main HD.
689 *
690 * Doing this wait-for-non-busy should not harm any existing
691 * configuration and fix some issues like the above.
692 *
693 * BenH.
694 *
695 * Returns 0 on success, error code (< 0) otherwise.
696 */
697
698 static int ide_port_wait_ready(ide_hwif_t *hwif)
699 {
700 int unit, rc;
701
702 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
703
704 /* Let HW settle down a bit from whatever init state we
705 * come from */
706 mdelay(2);
707
708 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
709 * I know of at least one disk who takes 31 seconds, I use 35
710 * here to be safe
711 */
712 rc = ide_wait_not_busy(hwif, 35000);
713 if (rc)
714 return rc;
715
716 /* Now make sure both master & slave are ready */
717 for (unit = 0; unit < MAX_DRIVES; unit++) {
718 ide_drive_t *drive = &hwif->drives[unit];
719
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 (unit)
736 SELECT_DRIVE(&hwif->drives[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
750 void ide_undecoded_slave(ide_drive_t *dev1)
751 {
752 ide_drive_t *dev0 = &dev1->hwif->drives[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
779 static int ide_probe_port(ide_hwif_t *hwif)
780 {
781 unsigned long flags;
782 unsigned int irqd;
783 int unit, rc = -ENODEV;
784
785 BUG_ON(hwif->present);
786
787 if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
788 (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
789 return -EACCES;
790
791 /*
792 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
793 * we'll install our IRQ driver much later...
794 */
795 irqd = hwif->irq;
796 if (irqd)
797 disable_irq(hwif->irq);
798
799 local_irq_set(flags);
800
801 if (ide_port_wait_ready(hwif) == -EBUSY)
802 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
803
804 /*
805 * Second drive should only exist if first drive was found,
806 * but a lot of cdrom drives are configured as single slaves.
807 */
808 for (unit = 0; unit < MAX_DRIVES; ++unit) {
809 ide_drive_t *drive = &hwif->drives[unit];
810
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
828 static void ide_port_tune_devices(ide_hwif_t *hwif)
829 {
830 const struct ide_port_ops *port_ops = hwif->port_ops;
831 int unit;
832
833 for (unit = 0; unit < MAX_DRIVES; unit++) {
834 ide_drive_t *drive = &hwif->drives[unit];
835
836 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
837 if (port_ops && port_ops->quirkproc)
838 port_ops->quirkproc(drive);
839 }
840 }
841
842 for (unit = 0; unit < MAX_DRIVES; ++unit) {
843 ide_drive_t *drive = &hwif->drives[unit];
844
845 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
846 ide_set_max_pio(drive);
847
848 drive->dev_flags |= IDE_DFLAG_NICE1;
849
850 if (hwif->dma_ops)
851 ide_set_dma(drive);
852 }
853 }
854
855 for (unit = 0; unit < MAX_DRIVES; ++unit) {
856 ide_drive_t *drive = &hwif->drives[unit];
857
858 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
859 drive->id[ATA_ID_DWORD_IO])
860 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
861 else
862 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
863 }
864 }
865
866 /*
867 * save_match() is used to simplify logic in init_irq() below.
868 *
869 * A loophole here is that we may not know about a particular
870 * hwif's irq until after that hwif is actually probed/initialized..
871 * This could be a problem for the case where an hwif is on a
872 * dual interface that requires serialization (eg. cmd640) and another
873 * hwif using one of the same irqs is initialized beforehand.
874 *
875 * This routine detects and reports such situations, but does not fix them.
876 */
877 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
878 {
879 ide_hwif_t *m = *match;
880
881 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
882 if (!new->hwgroup)
883 return;
884 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
885 hwif->name, new->name, m->name);
886 }
887 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
888 *match = new;
889 }
890
891 /*
892 * init request queue
893 */
894 static int ide_init_queue(ide_drive_t *drive)
895 {
896 struct request_queue *q;
897 ide_hwif_t *hwif = HWIF(drive);
898 int max_sectors = 256;
899 int max_sg_entries = PRD_ENTRIES;
900
901 /*
902 * Our default set up assumes the normal IDE case,
903 * that is 64K segmenting, standard PRD setup
904 * and LBA28. Some drivers then impose their own
905 * limits and LBA48 we could raise it but as yet
906 * do not.
907 */
908
909 q = blk_init_queue_node(do_ide_request, &hwif->hwgroup->lock,
910 hwif_to_node(hwif));
911 if (!q)
912 return 1;
913
914 q->queuedata = drive;
915 blk_queue_segment_boundary(q, 0xffff);
916
917 if (hwif->rqsize < max_sectors)
918 max_sectors = hwif->rqsize;
919 blk_queue_max_sectors(q, max_sectors);
920
921 #ifdef CONFIG_PCI
922 /* When we have an IOMMU, we may have a problem where pci_map_sg()
923 * creates segments that don't completely match our boundary
924 * requirements and thus need to be broken up again. Because it
925 * doesn't align properly either, we may actually have to break up
926 * to more segments than what was we got in the first place, a max
927 * worst case is twice as many.
928 * This will be fixed once we teach pci_map_sg() about our boundary
929 * requirements, hopefully soon. *FIXME*
930 */
931 if (!PCI_DMA_BUS_IS_PHYS)
932 max_sg_entries >>= 1;
933 #endif /* CONFIG_PCI */
934
935 blk_queue_max_hw_segments(q, max_sg_entries);
936 blk_queue_max_phys_segments(q, max_sg_entries);
937
938 /* assign drive queue */
939 drive->queue = q;
940
941 /* needs drive->queue to be set */
942 ide_toggle_bounce(drive, 1);
943
944 return 0;
945 }
946
947 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
948 {
949 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
950
951 spin_lock_irq(&hwgroup->lock);
952 if (!hwgroup->drive) {
953 /* first drive for hwgroup. */
954 drive->next = drive;
955 hwgroup->drive = drive;
956 hwgroup->hwif = HWIF(hwgroup->drive);
957 } else {
958 drive->next = hwgroup->drive->next;
959 hwgroup->drive->next = drive;
960 }
961 spin_unlock_irq(&hwgroup->lock);
962 }
963
964 /*
965 * For any present drive:
966 * - allocate the block device queue
967 * - link drive into the hwgroup
968 */
969 static int ide_port_setup_devices(ide_hwif_t *hwif)
970 {
971 int i, j = 0;
972
973 mutex_lock(&ide_cfg_mtx);
974 for (i = 0; i < MAX_DRIVES; i++) {
975 ide_drive_t *drive = &hwif->drives[i];
976
977 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
978 continue;
979
980 if (ide_init_queue(drive)) {
981 printk(KERN_ERR "ide: failed to init %s\n",
982 drive->name);
983 kfree(drive->id);
984 drive->id = NULL;
985 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
986 continue;
987 }
988
989 j++;
990
991 ide_add_drive_to_hwgroup(drive);
992 }
993 mutex_unlock(&ide_cfg_mtx);
994
995 return j;
996 }
997
998 static ide_hwif_t *ide_ports[MAX_HWIFS];
999
1000 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
1001 {
1002 ide_hwgroup_t *hwgroup = hwif->hwgroup;
1003
1004 ide_ports[hwif->index] = NULL;
1005
1006 spin_lock_irq(&hwgroup->lock);
1007 /*
1008 * Remove us from the hwgroup, and free
1009 * the hwgroup if we were the only member
1010 */
1011 if (hwif->next == hwif) {
1012 BUG_ON(hwgroup->hwif != hwif);
1013 kfree(hwgroup);
1014 } else {
1015 /* There is another interface in hwgroup.
1016 * Unlink us, and set hwgroup->drive and ->hwif to
1017 * something sane.
1018 */
1019 ide_hwif_t *g = hwgroup->hwif;
1020
1021 while (g->next != hwif)
1022 g = g->next;
1023 g->next = hwif->next;
1024 if (hwgroup->hwif == hwif) {
1025 /* Chose a random hwif for hwgroup->hwif.
1026 * It's guaranteed that there are no drives
1027 * left in the hwgroup.
1028 */
1029 BUG_ON(hwgroup->drive != NULL);
1030 hwgroup->hwif = g;
1031 }
1032 BUG_ON(hwgroup->hwif == hwif);
1033 }
1034 spin_unlock_irq(&hwgroup->lock);
1035 }
1036
1037 /*
1038 * This routine sets up the irq for an ide interface, and creates a new
1039 * hwgroup for the irq/hwif if none was previously assigned.
1040 *
1041 * Much of the code is for correctly detecting/handling irq sharing
1042 * and irq serialization situations. This is somewhat complex because
1043 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1044 */
1045 static int init_irq (ide_hwif_t *hwif)
1046 {
1047 struct ide_io_ports *io_ports = &hwif->io_ports;
1048 unsigned int index;
1049 ide_hwgroup_t *hwgroup;
1050 ide_hwif_t *match = NULL;
1051
1052 mutex_lock(&ide_cfg_mtx);
1053 hwif->hwgroup = NULL;
1054
1055 /*
1056 * Group up with any other hwifs that share our irq(s).
1057 */
1058 for (index = 0; index < MAX_HWIFS; index++) {
1059 ide_hwif_t *h = ide_ports[index];
1060
1061 if (h && h->hwgroup) { /* scan only initialized ports */
1062 if (hwif->irq == h->irq) {
1063 hwif->sharing_irq = h->sharing_irq = 1;
1064 if (hwif->chipset != ide_pci ||
1065 h->chipset != ide_pci) {
1066 save_match(hwif, h, &match);
1067 }
1068 }
1069 if (hwif->serialized) {
1070 if (hwif->mate && hwif->mate->irq == h->irq)
1071 save_match(hwif, h, &match);
1072 }
1073 if (h->serialized) {
1074 if (h->mate && hwif->irq == h->mate->irq)
1075 save_match(hwif, h, &match);
1076 }
1077 }
1078 }
1079
1080 /*
1081 * If we are still without a hwgroup, then form a new one
1082 */
1083 if (match) {
1084 hwgroup = match->hwgroup;
1085 hwif->hwgroup = hwgroup;
1086 /*
1087 * Link us into the hwgroup.
1088 * This must be done early, do ensure that unexpected_intr
1089 * can find the hwif and prevent irq storms.
1090 * No drives are attached to the new hwif, choose_drive
1091 * can't do anything stupid (yet).
1092 * Add ourself as the 2nd entry to the hwgroup->hwif
1093 * linked list, the first entry is the hwif that owns
1094 * hwgroup->handler - do not change that.
1095 */
1096 spin_lock_irq(&hwgroup->lock);
1097 hwif->next = hwgroup->hwif->next;
1098 hwgroup->hwif->next = hwif;
1099 BUG_ON(hwif->next == hwif);
1100 spin_unlock_irq(&hwgroup->lock);
1101 } else {
1102 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1103 hwif_to_node(hwif));
1104 if (hwgroup == NULL)
1105 goto out_up;
1106
1107 spin_lock_init(&hwgroup->lock);
1108
1109 hwif->hwgroup = hwgroup;
1110 hwgroup->hwif = hwif->next = hwif;
1111
1112 init_timer(&hwgroup->timer);
1113 hwgroup->timer.function = &ide_timer_expiry;
1114 hwgroup->timer.data = (unsigned long) hwgroup;
1115 }
1116
1117 ide_ports[hwif->index] = hwif;
1118
1119 /*
1120 * Allocate the irq, if not already obtained for another hwif
1121 */
1122 if (!match || match->irq != hwif->irq) {
1123 int sa = 0;
1124 #if defined(__mc68000__)
1125 sa = IRQF_SHARED;
1126 #endif /* __mc68000__ */
1127
1128 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1129 hwif->chipset == ide_ali14xx)
1130 sa = IRQF_SHARED;
1131
1132 if (io_ports->ctl_addr)
1133 hwif->tp_ops->set_irq(hwif, 1);
1134
1135 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1136 goto out_unlink;
1137 }
1138
1139 if (!hwif->rqsize) {
1140 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1141 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1142 hwif->rqsize = 256;
1143 else
1144 hwif->rqsize = 65536;
1145 }
1146
1147 #if !defined(__mc68000__)
1148 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1149 io_ports->data_addr, io_ports->status_addr,
1150 io_ports->ctl_addr, hwif->irq);
1151 #else
1152 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1153 io_ports->data_addr, hwif->irq);
1154 #endif /* __mc68000__ */
1155 if (match)
1156 printk(KERN_CONT " (%sed with %s)",
1157 hwif->sharing_irq ? "shar" : "serializ", match->name);
1158 printk(KERN_CONT "\n");
1159
1160 mutex_unlock(&ide_cfg_mtx);
1161 return 0;
1162 out_unlink:
1163 ide_remove_port_from_hwgroup(hwif);
1164 out_up:
1165 mutex_unlock(&ide_cfg_mtx);
1166 return 1;
1167 }
1168
1169 static int ata_lock(dev_t dev, void *data)
1170 {
1171 /* FIXME: we want to pin hwif down */
1172 return 0;
1173 }
1174
1175 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1176 {
1177 ide_hwif_t *hwif = data;
1178 int unit = *part >> PARTN_BITS;
1179 ide_drive_t *drive = &hwif->drives[unit];
1180
1181 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1182 return NULL;
1183
1184 if (drive->media == ide_disk)
1185 request_module("ide-disk");
1186 if (drive->dev_flags & IDE_DFLAG_SCSI)
1187 request_module("ide-scsi");
1188 if (drive->media == ide_cdrom || drive->media == ide_optical)
1189 request_module("ide-cd");
1190 if (drive->media == ide_tape)
1191 request_module("ide-tape");
1192 if (drive->media == ide_floppy)
1193 request_module("ide-floppy");
1194
1195 return NULL;
1196 }
1197
1198 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1199 {
1200 struct gendisk *p = data;
1201 *part &= (1 << PARTN_BITS) - 1;
1202 return &disk_to_dev(p)->kobj;
1203 }
1204
1205 static int exact_lock(dev_t dev, void *data)
1206 {
1207 struct gendisk *p = data;
1208
1209 if (!get_disk(p))
1210 return -1;
1211 return 0;
1212 }
1213
1214 void ide_register_region(struct gendisk *disk)
1215 {
1216 blk_register_region(MKDEV(disk->major, disk->first_minor),
1217 disk->minors, NULL, exact_match, exact_lock, disk);
1218 }
1219
1220 EXPORT_SYMBOL_GPL(ide_register_region);
1221
1222 void ide_unregister_region(struct gendisk *disk)
1223 {
1224 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1225 disk->minors);
1226 }
1227
1228 EXPORT_SYMBOL_GPL(ide_unregister_region);
1229
1230 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1231 {
1232 ide_hwif_t *hwif = drive->hwif;
1233 unsigned int unit = drive->dn & 1;
1234
1235 disk->major = hwif->major;
1236 disk->first_minor = unit << PARTN_BITS;
1237 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1238 disk->queue = drive->queue;
1239 }
1240
1241 EXPORT_SYMBOL_GPL(ide_init_disk);
1242
1243 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1244 {
1245 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1246
1247 if (drive == drive->next) {
1248 /* special case: last drive from hwgroup. */
1249 BUG_ON(hwgroup->drive != drive);
1250 hwgroup->drive = NULL;
1251 } else {
1252 ide_drive_t *walk;
1253
1254 walk = hwgroup->drive;
1255 while (walk->next != drive)
1256 walk = walk->next;
1257 walk->next = drive->next;
1258 if (hwgroup->drive == drive) {
1259 hwgroup->drive = drive->next;
1260 hwgroup->hwif = hwgroup->drive->hwif;
1261 }
1262 }
1263 BUG_ON(hwgroup->drive == drive);
1264 }
1265
1266 static void drive_release_dev (struct device *dev)
1267 {
1268 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1269 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1270
1271 ide_proc_unregister_device(drive);
1272
1273 spin_lock_irq(&hwgroup->lock);
1274 ide_remove_drive_from_hwgroup(drive);
1275 kfree(drive->id);
1276 drive->id = NULL;
1277 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1278 /* Messed up locking ... */
1279 spin_unlock_irq(&hwgroup->lock);
1280 blk_cleanup_queue(drive->queue);
1281 spin_lock_irq(&hwgroup->lock);
1282 drive->queue = NULL;
1283 spin_unlock_irq(&hwgroup->lock);
1284
1285 complete(&drive->gendev_rel_comp);
1286 }
1287
1288 static int hwif_init(ide_hwif_t *hwif)
1289 {
1290 int old_irq;
1291
1292 if (!hwif->irq) {
1293 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1294 if (!hwif->irq) {
1295 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1296 return 0;
1297 }
1298 }
1299
1300 if (register_blkdev(hwif->major, hwif->name))
1301 return 0;
1302
1303 if (!hwif->sg_max_nents)
1304 hwif->sg_max_nents = PRD_ENTRIES;
1305
1306 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1307 GFP_KERNEL);
1308 if (!hwif->sg_table) {
1309 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1310 goto out;
1311 }
1312
1313 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1314
1315 if (init_irq(hwif) == 0)
1316 goto done;
1317
1318 old_irq = hwif->irq;
1319 /*
1320 * It failed to initialise. Find the default IRQ for
1321 * this port and try that.
1322 */
1323 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1324 if (!hwif->irq) {
1325 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1326 hwif->name, old_irq);
1327 goto out;
1328 }
1329 if (init_irq(hwif)) {
1330 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1331 hwif->name, old_irq, hwif->irq);
1332 goto out;
1333 }
1334 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1335 hwif->name, hwif->irq);
1336
1337 done:
1338 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1339 THIS_MODULE, ata_probe, ata_lock, hwif);
1340 return 1;
1341
1342 out:
1343 unregister_blkdev(hwif->major, hwif->name);
1344 return 0;
1345 }
1346
1347 static void hwif_register_devices(ide_hwif_t *hwif)
1348 {
1349 unsigned int i;
1350
1351 for (i = 0; i < MAX_DRIVES; i++) {
1352 ide_drive_t *drive = &hwif->drives[i];
1353 struct device *dev = &drive->gendev;
1354 int ret;
1355
1356 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1357 continue;
1358
1359 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1360 dev->parent = &hwif->gendev;
1361 dev->bus = &ide_bus_type;
1362 dev->driver_data = drive;
1363 dev->release = drive_release_dev;
1364
1365 ret = device_register(dev);
1366 if (ret < 0)
1367 printk(KERN_WARNING "IDE: %s: device_register error: "
1368 "%d\n", __func__, ret);
1369 }
1370 }
1371
1372 static void ide_port_init_devices(ide_hwif_t *hwif)
1373 {
1374 const struct ide_port_ops *port_ops = hwif->port_ops;
1375 int i;
1376
1377 for (i = 0; i < MAX_DRIVES; i++) {
1378 ide_drive_t *drive = &hwif->drives[i];
1379
1380 drive->dn = i + hwif->channel * 2;
1381
1382 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1383 drive->io_32bit = 1;
1384 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1385 drive->dev_flags |= IDE_DFLAG_UNMASK;
1386 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1387 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1388
1389 if (port_ops && port_ops->init_dev)
1390 port_ops->init_dev(drive);
1391 }
1392 }
1393
1394 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1395 const struct ide_port_info *d)
1396 {
1397 hwif->channel = port;
1398
1399 if (d->chipset)
1400 hwif->chipset = d->chipset;
1401
1402 if (d->init_iops)
1403 d->init_iops(hwif);
1404
1405 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1406 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1407 hwif->irq = port ? 15 : 14;
1408
1409 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1410 hwif->host_flags |= d->host_flags;
1411 hwif->pio_mask = d->pio_mask;
1412
1413 if (d->tp_ops)
1414 hwif->tp_ops = d->tp_ops;
1415
1416 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1417 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1418 hwif->port_ops = d->port_ops;
1419
1420 hwif->swdma_mask = d->swdma_mask;
1421 hwif->mwdma_mask = d->mwdma_mask;
1422 hwif->ultra_mask = d->udma_mask;
1423
1424 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1425 int rc;
1426
1427 if (d->init_dma)
1428 rc = d->init_dma(hwif, d);
1429 else
1430 rc = ide_hwif_setup_dma(hwif, d);
1431
1432 if (rc < 0) {
1433 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1434 hwif->dma_base = 0;
1435 hwif->swdma_mask = 0;
1436 hwif->mwdma_mask = 0;
1437 hwif->ultra_mask = 0;
1438 } else if (d->dma_ops)
1439 hwif->dma_ops = d->dma_ops;
1440 }
1441
1442 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1443 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1444 if (hwif->mate)
1445 hwif->mate->serialized = hwif->serialized = 1;
1446 }
1447
1448 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1449 hwif->rqsize = 256;
1450
1451 /* call chipset specific routine for each enabled port */
1452 if (d->init_hwif)
1453 d->init_hwif(hwif);
1454 }
1455
1456 static void ide_port_cable_detect(ide_hwif_t *hwif)
1457 {
1458 const struct ide_port_ops *port_ops = hwif->port_ops;
1459
1460 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1461 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1462 hwif->cbl = port_ops->cable_detect(hwif);
1463 }
1464 }
1465
1466 static ssize_t store_delete_devices(struct device *portdev,
1467 struct device_attribute *attr,
1468 const char *buf, size_t n)
1469 {
1470 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1471
1472 if (strncmp(buf, "1", n))
1473 return -EINVAL;
1474
1475 ide_port_unregister_devices(hwif);
1476
1477 return n;
1478 };
1479
1480 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1481
1482 static ssize_t store_scan(struct device *portdev,
1483 struct device_attribute *attr,
1484 const char *buf, size_t n)
1485 {
1486 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1487
1488 if (strncmp(buf, "1", n))
1489 return -EINVAL;
1490
1491 ide_port_unregister_devices(hwif);
1492 ide_port_scan(hwif);
1493
1494 return n;
1495 };
1496
1497 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1498
1499 static struct device_attribute *ide_port_attrs[] = {
1500 &dev_attr_delete_devices,
1501 &dev_attr_scan,
1502 NULL
1503 };
1504
1505 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1506 {
1507 int i, uninitialized_var(rc);
1508
1509 for (i = 0; ide_port_attrs[i]; i++) {
1510 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1511 if (rc)
1512 break;
1513 }
1514
1515 return rc;
1516 }
1517
1518 static unsigned int ide_indexes;
1519
1520 /**
1521 * ide_find_port_slot - find free port slot
1522 * @d: IDE port info
1523 *
1524 * Return the new port slot index or -ENOENT if we are out of free slots.
1525 */
1526
1527 static int ide_find_port_slot(const struct ide_port_info *d)
1528 {
1529 int idx = -ENOENT;
1530 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1531 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1532
1533 /*
1534 * Claim an unassigned slot.
1535 *
1536 * Give preference to claiming other slots before claiming ide0/ide1,
1537 * just in case there's another interface yet-to-be-scanned
1538 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1539 *
1540 * Unless there is a bootable card that does not use the standard
1541 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1542 */
1543 mutex_lock(&ide_cfg_mtx);
1544 if (bootable) {
1545 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1546 idx = ffz(ide_indexes | i);
1547 } else {
1548 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1549 idx = ffz(ide_indexes | 3);
1550 else if ((ide_indexes & 3) != 3)
1551 idx = ffz(ide_indexes);
1552 }
1553 if (idx >= 0)
1554 ide_indexes |= (1 << idx);
1555 mutex_unlock(&ide_cfg_mtx);
1556
1557 return idx;
1558 }
1559
1560 static void ide_free_port_slot(int idx)
1561 {
1562 mutex_lock(&ide_cfg_mtx);
1563 ide_indexes &= ~(1 << idx);
1564 mutex_unlock(&ide_cfg_mtx);
1565 }
1566
1567 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1568 {
1569 struct ide_host *host;
1570 int i;
1571
1572 host = kzalloc(sizeof(*host), GFP_KERNEL);
1573 if (host == NULL)
1574 return NULL;
1575
1576 for (i = 0; i < MAX_HOST_PORTS; i++) {
1577 ide_hwif_t *hwif;
1578 int idx;
1579
1580 if (hws[i] == NULL)
1581 continue;
1582
1583 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1584 if (hwif == NULL)
1585 continue;
1586
1587 idx = ide_find_port_slot(d);
1588 if (idx < 0) {
1589 printk(KERN_ERR "%s: no free slot for interface\n",
1590 d ? d->name : "ide");
1591 kfree(hwif);
1592 continue;
1593 }
1594
1595 ide_init_port_data(hwif, idx);
1596
1597 hwif->host = host;
1598
1599 host->ports[i] = hwif;
1600 host->n_ports++;
1601 }
1602
1603 if (host->n_ports == 0) {
1604 kfree(host);
1605 return NULL;
1606 }
1607
1608 if (hws[0])
1609 host->dev[0] = hws[0]->dev;
1610
1611 if (d) {
1612 host->init_chipset = d->init_chipset;
1613 host->host_flags = d->host_flags;
1614 }
1615
1616 return host;
1617 }
1618 EXPORT_SYMBOL_GPL(ide_host_alloc);
1619
1620 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1621 hw_regs_t **hws)
1622 {
1623 ide_hwif_t *hwif, *mate = NULL;
1624 int i, j = 0;
1625
1626 for (i = 0; i < MAX_HOST_PORTS; i++) {
1627 hwif = host->ports[i];
1628
1629 if (hwif == NULL) {
1630 mate = NULL;
1631 continue;
1632 }
1633
1634 ide_init_port_hw(hwif, hws[i]);
1635 ide_port_apply_params(hwif);
1636
1637 if (d == NULL) {
1638 mate = NULL;
1639 } else {
1640 if ((i & 1) && mate) {
1641 hwif->mate = mate;
1642 mate->mate = hwif;
1643 }
1644
1645 mate = (i & 1) ? NULL : hwif;
1646
1647 ide_init_port(hwif, i & 1, d);
1648 ide_port_cable_detect(hwif);
1649 }
1650
1651 ide_port_init_devices(hwif);
1652 }
1653
1654 for (i = 0; i < MAX_HOST_PORTS; i++) {
1655 hwif = host->ports[i];
1656
1657 if (hwif == NULL)
1658 continue;
1659
1660 if (ide_probe_port(hwif) == 0)
1661 hwif->present = 1;
1662
1663 if (hwif->chipset != ide_4drives || !hwif->mate ||
1664 !hwif->mate->present)
1665 ide_register_port(hwif);
1666
1667 if (hwif->present)
1668 ide_port_tune_devices(hwif);
1669 }
1670
1671 for (i = 0; i < MAX_HOST_PORTS; i++) {
1672 hwif = host->ports[i];
1673
1674 if (hwif == NULL)
1675 continue;
1676
1677 if (hwif_init(hwif) == 0) {
1678 printk(KERN_INFO "%s: failed to initialize IDE "
1679 "interface\n", hwif->name);
1680 hwif->present = 0;
1681 continue;
1682 }
1683
1684 if (hwif->present)
1685 if (ide_port_setup_devices(hwif) == 0) {
1686 hwif->present = 0;
1687 continue;
1688 }
1689
1690 j++;
1691
1692 ide_acpi_init(hwif);
1693
1694 if (hwif->present)
1695 ide_acpi_port_init_devices(hwif);
1696 }
1697
1698 for (i = 0; i < MAX_HOST_PORTS; i++) {
1699 hwif = host->ports[i];
1700
1701 if (hwif == NULL)
1702 continue;
1703
1704 if (hwif->chipset == ide_unknown)
1705 hwif->chipset = ide_generic;
1706
1707 if (hwif->present)
1708 hwif_register_devices(hwif);
1709 }
1710
1711 for (i = 0; i < MAX_HOST_PORTS; i++) {
1712 hwif = host->ports[i];
1713
1714 if (hwif == NULL)
1715 continue;
1716
1717 ide_sysfs_register_port(hwif);
1718 ide_proc_register_port(hwif);
1719
1720 if (hwif->present)
1721 ide_proc_port_register_devices(hwif);
1722 }
1723
1724 return j ? 0 : -1;
1725 }
1726 EXPORT_SYMBOL_GPL(ide_host_register);
1727
1728 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1729 struct ide_host **hostp)
1730 {
1731 struct ide_host *host;
1732 int rc;
1733
1734 host = ide_host_alloc(d, hws);
1735 if (host == NULL)
1736 return -ENOMEM;
1737
1738 rc = ide_host_register(host, d, hws);
1739 if (rc) {
1740 ide_host_free(host);
1741 return rc;
1742 }
1743
1744 if (hostp)
1745 *hostp = host;
1746
1747 return 0;
1748 }
1749 EXPORT_SYMBOL_GPL(ide_host_add);
1750
1751 void ide_host_free(struct ide_host *host)
1752 {
1753 ide_hwif_t *hwif;
1754 int i;
1755
1756 for (i = 0; i < MAX_HOST_PORTS; i++) {
1757 hwif = host->ports[i];
1758
1759 if (hwif == NULL)
1760 continue;
1761
1762 ide_free_port_slot(hwif->index);
1763 kfree(hwif);
1764 }
1765
1766 kfree(host);
1767 }
1768 EXPORT_SYMBOL_GPL(ide_host_free);
1769
1770 void ide_host_remove(struct ide_host *host)
1771 {
1772 int i;
1773
1774 for (i = 0; i < MAX_HOST_PORTS; i++) {
1775 if (host->ports[i])
1776 ide_unregister(host->ports[i]);
1777 }
1778
1779 ide_host_free(host);
1780 }
1781 EXPORT_SYMBOL_GPL(ide_host_remove);
1782
1783 void ide_port_scan(ide_hwif_t *hwif)
1784 {
1785 ide_port_apply_params(hwif);
1786 ide_port_cable_detect(hwif);
1787 ide_port_init_devices(hwif);
1788
1789 if (ide_probe_port(hwif) < 0)
1790 return;
1791
1792 hwif->present = 1;
1793
1794 ide_port_tune_devices(hwif);
1795 ide_acpi_port_init_devices(hwif);
1796 ide_port_setup_devices(hwif);
1797 hwif_register_devices(hwif);
1798 ide_proc_port_register_devices(hwif);
1799 }
1800 EXPORT_SYMBOL_GPL(ide_port_scan);
1801
1802 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1803 u8 port_no, const struct ide_port_info *d,
1804 unsigned long config)
1805 {
1806 unsigned long base, ctl;
1807 int irq;
1808
1809 if (port_no == 0) {
1810 base = 0x1f0;
1811 ctl = 0x3f6;
1812 irq = 14;
1813 } else {
1814 base = 0x170;
1815 ctl = 0x376;
1816 irq = 15;
1817 }
1818
1819 if (!request_region(base, 8, d->name)) {
1820 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1821 d->name, base, base + 7);
1822 return;
1823 }
1824
1825 if (!request_region(ctl, 1, d->name)) {
1826 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1827 d->name, ctl);
1828 release_region(base, 8);
1829 return;
1830 }
1831
1832 ide_std_init_ports(hw, base, ctl);
1833 hw->irq = irq;
1834 hw->chipset = d->chipset;
1835 hw->config = config;
1836
1837 hws[port_no] = hw;
1838 }
1839
1840 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1841 {
1842 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1843
1844 memset(&hw, 0, sizeof(hw));
1845
1846 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1847 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1848 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1849
1850 if (hws[0] == NULL && hws[1] == NULL &&
1851 (d->host_flags & IDE_HFLAG_SINGLE))
1852 return -ENOENT;
1853
1854 return ide_host_add(d, hws, NULL);
1855 }
1856 EXPORT_SYMBOL_GPL(ide_legacy_device_add);
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