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ide: IDE_HFLAG_SERIALIZE_DMA bugfix
[linux-2.6/mini2440.git] / drivers / ide / ide-probe.c
blob34b0d4f26b5885bb22a3ea88a3898b4900e5678d
1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
10 *
11 * See linux/MAINTAINERS for address of current maintainer.
12 *
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
14 *
15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16 * by Andrea Arcangeli
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
45 *
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
49 */
50
51 static void generic_id(ide_drive_t *drive)
52 {
53 drive->id->cyls = drive->cyl;
54 drive->id->heads = drive->head;
55 drive->id->sectors = drive->sect;
56 drive->id->cur_cyls = drive->cyl;
57 drive->id->cur_heads = drive->head;
58 drive->id->cur_sectors = drive->sect;
59 }
60
61 static void ide_disk_init_chs(ide_drive_t *drive)
62 {
63 struct hd_driveid *id = drive->id;
64
65 /* Extract geometry if we did not already have one for the drive */
66 if (!drive->cyl || !drive->head || !drive->sect) {
67 drive->cyl = drive->bios_cyl = id->cyls;
68 drive->head = drive->bios_head = id->heads;
69 drive->sect = drive->bios_sect = id->sectors;
70 }
71
72 /* Handle logical geometry translation by the drive */
73 if ((id->field_valid & 1) && id->cur_cyls &&
74 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
75 drive->cyl = id->cur_cyls;
76 drive->head = id->cur_heads;
77 drive->sect = id->cur_sectors;
78 }
79
80 /* Use physical geometry if what we have still makes no sense */
81 if (drive->head > 16 && id->heads && id->heads <= 16) {
82 drive->cyl = id->cyls;
83 drive->head = id->heads;
84 drive->sect = id->sectors;
85 }
86 }
87
88 static void ide_disk_init_mult_count(ide_drive_t *drive)
89 {
90 struct hd_driveid *id = drive->id;
91
92 drive->mult_count = 0;
93 if (id->max_multsect) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
96 id->multsect_valid = id->multsect ? 1 : 0;
97 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
98 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
99 #else /* original, pre IDE-NFG, per request of AC */
100 drive->mult_req = 0;
101 if (drive->mult_req > id->max_multsect)
102 drive->mult_req = id->max_multsect;
103 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
104 drive->special.b.set_multmode = 1;
105 #endif
106 }
107 }
108
109 /**
110 * do_identify - identify a drive
111 * @drive: drive to identify
112 * @cmd: command used
113 *
114 * Called when we have issued a drive identify command to
115 * read and parse the results. This function is run with
116 * interrupts disabled.
117 */
118
119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
120 {
121 ide_hwif_t *hwif = HWIF(drive);
122 int bswap = 1;
123 struct hd_driveid *id;
124
125 id = drive->id;
126 /* read 512 bytes of id info */
127 hwif->input_data(drive, NULL, id, SECTOR_SIZE);
128
129 drive->id_read = 1;
130 local_irq_enable();
131 #ifdef DEBUG
132 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
133 ide_dump_identify((u8 *)id);
134 #endif
135 ide_fix_driveid(id);
136
137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
138 /*
139 * EATA SCSI controllers do a hardware ATA emulation:
140 * Ignore them if there is a driver for them available.
141 */
142 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
143 (id->model[0] == 'S' && id->model[1] == 'K')) {
144 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
145 goto err_misc;
146 }
147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
148
149 /*
150 * WIN_IDENTIFY returns little-endian info,
151 * WIN_PIDENTIFY *usually* returns little-endian info.
152 */
153 if (cmd == WIN_PIDENTIFY) {
154 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
155 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
156 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
157 /* Vertos drives may still be weird */
158 bswap ^= 1;
159 }
160 ide_fixstring(id->model, sizeof(id->model), bswap);
161 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
162 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
163
164 /* we depend on this a lot! */
165 id->model[sizeof(id->model)-1] = '\0';
166
167 if (strstr(id->model, "E X A B Y T E N E S T"))
168 goto err_misc;
169
170 printk("%s: %s, ", drive->name, id->model);
171 drive->present = 1;
172 drive->dead = 0;
173
174 /*
175 * Check for an ATAPI device
176 */
177 if (cmd == WIN_PIDENTIFY) {
178 u8 type = (id->config >> 8) & 0x1f;
179 printk("ATAPI ");
180 switch (type) {
181 case ide_floppy:
182 if (!strstr(id->model, "CD-ROM")) {
183 if (!strstr(id->model, "oppy") &&
184 !strstr(id->model, "poyp") &&
185 !strstr(id->model, "ZIP"))
186 printk("cdrom or floppy?, assuming ");
187 if (drive->media != ide_cdrom) {
188 printk ("FLOPPY");
189 drive->removable = 1;
190 break;
191 }
192 }
193 /* Early cdrom models used zero */
194 type = ide_cdrom;
195 case ide_cdrom:
196 drive->removable = 1;
197 #ifdef CONFIG_PPC
198 /* kludge for Apple PowerBook internal zip */
199 if (!strstr(id->model, "CD-ROM") &&
200 strstr(id->model, "ZIP")) {
201 printk ("FLOPPY");
202 type = ide_floppy;
203 break;
204 }
205 #endif
206 printk ("CD/DVD-ROM");
207 break;
208 case ide_tape:
209 printk ("TAPE");
210 break;
211 case ide_optical:
212 printk ("OPTICAL");
213 drive->removable = 1;
214 break;
215 default:
216 printk("UNKNOWN (type %d)", type);
217 break;
218 }
219 printk (" drive\n");
220 drive->media = type;
221 /* an ATAPI device ignores DRDY */
222 drive->ready_stat = 0;
223 return;
224 }
225
226 /*
227 * Not an ATAPI device: looks like a "regular" hard disk
228 */
229
230 /*
231 * 0x848a = CompactFlash device
232 * These are *not* removable in Linux definition of the term
233 */
234
235 if ((id->config != 0x848a) && (id->config & (1<<7)))
236 drive->removable = 1;
237
238 drive->media = ide_disk;
239 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
240
241 return;
242
243 err_misc:
244 kfree(id);
245 drive->present = 0;
246 return;
247 }
248
249 /**
250 * actual_try_to_identify - send ata/atapi identify
251 * @drive: drive to identify
252 * @cmd: command to use
253 *
254 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
255 * and waits for a response. It also monitors irqs while this is
256 * happening, in hope of automatically determining which one is
257 * being used by the interface.
258 *
259 * Returns: 0 device was identified
260 * 1 device timed-out (no response to identify request)
261 * 2 device aborted the command (refused to identify itself)
262 */
263
264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
265 {
266 ide_hwif_t *hwif = HWIF(drive);
267 struct ide_io_ports *io_ports = &hwif->io_ports;
268 int use_altstatus = 0, rc;
269 unsigned long timeout;
270 u8 s = 0, a = 0;
271
272 /* take a deep breath */
273 msleep(50);
274
275 if (io_ports->ctl_addr) {
276 a = ide_read_altstatus(drive);
277 s = ide_read_status(drive);
278 if ((a ^ s) & ~INDEX_STAT)
279 /* ancient Seagate drives, broken interfaces */
280 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
281 "instead of ALTSTATUS(0x%02x)\n",
282 drive->name, s, a);
283 else
284 /* use non-intrusive polling */
285 use_altstatus = 1;
286 }
287
288 /* set features register for atapi
289 * identify command to be sure of reply
290 */
291 if ((cmd == WIN_PIDENTIFY))
292 /* disable dma & overlap */
293 hwif->OUTB(0, io_ports->feature_addr);
294
295 /* ask drive for ID */
296 hwif->OUTBSYNC(drive, cmd, io_ports->command_addr);
297
298 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
299 timeout += jiffies;
300 do {
301 if (time_after(jiffies, timeout)) {
302 /* drive timed-out */
303 return 1;
304 }
305 /* give drive a breather */
306 msleep(50);
307 s = use_altstatus ? ide_read_altstatus(drive)
308 : ide_read_status(drive);
309 } while (s & BUSY_STAT);
310
311 /* wait for IRQ and DRQ_STAT */
312 msleep(50);
313 s = ide_read_status(drive);
314
315 if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
316 unsigned long flags;
317
318 /* local CPU only; some systems need this */
319 local_irq_save(flags);
320 /* drive returned ID */
321 do_identify(drive, cmd);
322 /* drive responded with ID */
323 rc = 0;
324 /* clear drive IRQ */
325 (void)ide_read_status(drive);
326 local_irq_restore(flags);
327 } else {
328 /* drive refused ID */
329 rc = 2;
330 }
331 return rc;
332 }
333
334 /**
335 * try_to_identify - try to identify a drive
336 * @drive: drive to probe
337 * @cmd: command to use
338 *
339 * Issue the identify command and then do IRQ probing to
340 * complete the identification when needed by finding the
341 * IRQ the drive is attached to
342 */
343
344 static int try_to_identify (ide_drive_t *drive, u8 cmd)
345 {
346 ide_hwif_t *hwif = HWIF(drive);
347 int retval;
348 int autoprobe = 0;
349 unsigned long cookie = 0;
350
351 /*
352 * Disable device irq unless we need to
353 * probe for it. Otherwise we'll get spurious
354 * interrupts during the identify-phase that
355 * the irq handler isn't expecting.
356 */
357 if (hwif->io_ports.ctl_addr) {
358 if (!hwif->irq) {
359 autoprobe = 1;
360 cookie = probe_irq_on();
361 }
362 ide_set_irq(drive, autoprobe);
363 }
364
365 retval = actual_try_to_identify(drive, cmd);
366
367 if (autoprobe) {
368 int irq;
369
370 ide_set_irq(drive, 0);
371 /* clear drive IRQ */
372 (void)ide_read_status(drive);
373 udelay(5);
374 irq = probe_irq_off(cookie);
375 if (!hwif->irq) {
376 if (irq > 0) {
377 hwif->irq = irq;
378 } else {
379 /* Mmmm.. multiple IRQs..
380 * don't know which was ours
381 */
382 printk("%s: IRQ probe failed (0x%lx)\n",
383 drive->name, cookie);
384 }
385 }
386 }
387 return retval;
388 }
389
390 static int ide_busy_sleep(ide_hwif_t *hwif)
391 {
392 unsigned long timeout = jiffies + WAIT_WORSTCASE;
393 u8 stat;
394
395 do {
396 msleep(50);
397 stat = hwif->INB(hwif->io_ports.status_addr);
398 if ((stat & BUSY_STAT) == 0)
399 return 0;
400 } while (time_before(jiffies, timeout));
401
402 return 1;
403 }
404
405 /**
406 * do_probe - probe an IDE device
407 * @drive: drive to probe
408 * @cmd: command to use
409 *
410 * do_probe() has the difficult job of finding a drive if it exists,
411 * without getting hung up if it doesn't exist, without trampling on
412 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
413 *
414 * If a drive is "known" to exist (from CMOS or kernel parameters),
415 * but does not respond right away, the probe will "hang in there"
416 * for the maximum wait time (about 30 seconds), otherwise it will
417 * exit much more quickly.
418 *
419 * Returns: 0 device was identified
420 * 1 device timed-out (no response to identify request)
421 * 2 device aborted the command (refused to identify itself)
422 * 3 bad status from device (possible for ATAPI drives)
423 * 4 probe was not attempted because failure was obvious
424 */
425
426 static int do_probe (ide_drive_t *drive, u8 cmd)
427 {
428 ide_hwif_t *hwif = HWIF(drive);
429 struct ide_io_ports *io_ports = &hwif->io_ports;
430 int rc;
431 u8 stat;
432
433 if (drive->present) {
434 /* avoid waiting for inappropriate probes */
435 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
436 return 4;
437 }
438 #ifdef DEBUG
439 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
440 drive->name, drive->present, drive->media,
441 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
442 #endif
443
444 /* needed for some systems
445 * (e.g. crw9624 as drive0 with disk as slave)
446 */
447 msleep(50);
448 SELECT_DRIVE(drive);
449 msleep(50);
450 if (hwif->INB(io_ports->device_addr) != drive->select.all &&
451 !drive->present) {
452 if (drive->select.b.unit != 0) {
453 /* exit with drive0 selected */
454 SELECT_DRIVE(&hwif->drives[0]);
455 /* allow BUSY_STAT to assert & clear */
456 msleep(50);
457 }
458 /* no i/f present: mmm.. this should be a 4 -ml */
459 return 3;
460 }
461
462 stat = ide_read_status(drive);
463
464 if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
465 drive->present || cmd == WIN_PIDENTIFY) {
466 /* send cmd and wait */
467 if ((rc = try_to_identify(drive, cmd))) {
468 /* failed: try again */
469 rc = try_to_identify(drive,cmd);
470 }
471
472 stat = ide_read_status(drive);
473
474 if (stat == (BUSY_STAT | READY_STAT))
475 return 4;
476
477 if (rc == 1 && cmd == WIN_PIDENTIFY) {
478 printk(KERN_ERR "%s: no response (status = 0x%02x), "
479 "resetting drive\n", drive->name, stat);
480 msleep(50);
481 hwif->OUTB(drive->select.all, io_ports->device_addr);
482 msleep(50);
483 hwif->OUTBSYNC(drive, WIN_SRST, io_ports->command_addr);
484 (void)ide_busy_sleep(hwif);
485 rc = try_to_identify(drive, cmd);
486 }
487
488 /* ensure drive IRQ is clear */
489 stat = ide_read_status(drive);
490
491 if (rc == 1)
492 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
493 drive->name, stat);
494 } else {
495 /* not present or maybe ATAPI */
496 rc = 3;
497 }
498 if (drive->select.b.unit != 0) {
499 /* exit with drive0 selected */
500 SELECT_DRIVE(&hwif->drives[0]);
501 msleep(50);
502 /* ensure drive irq is clear */
503 (void)ide_read_status(drive);
504 }
505 return rc;
506 }
507
508 /*
509 *
510 */
511 static void enable_nest (ide_drive_t *drive)
512 {
513 ide_hwif_t *hwif = HWIF(drive);
514 u8 stat;
515
516 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
517 SELECT_DRIVE(drive);
518 msleep(50);
519 hwif->OUTBSYNC(drive, EXABYTE_ENABLE_NEST, hwif->io_ports.command_addr);
520
521 if (ide_busy_sleep(hwif)) {
522 printk(KERN_CONT "failed (timeout)\n");
523 return;
524 }
525
526 msleep(50);
527
528 stat = ide_read_status(drive);
529
530 if (!OK_STAT(stat, 0, BAD_STAT))
531 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
532 else
533 printk(KERN_CONT "success\n");
534
535 /* if !(success||timed-out) */
536 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
537 /* look for ATAPI device */
538 (void) do_probe(drive, WIN_PIDENTIFY);
539 }
540 }
541
542 /**
543 * probe_for_drives - upper level drive probe
544 * @drive: drive to probe for
545 *
546 * probe_for_drive() tests for existence of a given drive using do_probe()
547 * and presents things to the user as needed.
548 *
549 * Returns: 0 no device was found
550 * 1 device was found (note: drive->present might
551 * still be 0)
552 */
553
554 static inline u8 probe_for_drive (ide_drive_t *drive)
555 {
556 /*
557 * In order to keep things simple we have an id
558 * block for all drives at all times. If the device
559 * is pre ATA or refuses ATA/ATAPI identify we
560 * will add faked data to this.
561 *
562 * Also note that 0 everywhere means "can't do X"
563 */
564
565 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
566 drive->id_read = 0;
567 if(drive->id == NULL)
568 {
569 printk(KERN_ERR "ide: out of memory for id data.\n");
570 return 0;
571 }
572 strcpy(drive->id->model, "UNKNOWN");
573
574 /* skip probing? */
575 if (!drive->noprobe)
576 {
577 /* if !(success||timed-out) */
578 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
579 /* look for ATAPI device */
580 (void) do_probe(drive, WIN_PIDENTIFY);
581 }
582 if (!drive->present)
583 /* drive not found */
584 return 0;
585 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
586 enable_nest(drive);
587
588 /* identification failed? */
589 if (!drive->id_read) {
590 if (drive->media == ide_disk) {
591 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
592 drive->name, drive->cyl,
593 drive->head, drive->sect);
594 } else if (drive->media == ide_cdrom) {
595 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
596 } else {
597 /* nuke it */
598 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
599 drive->present = 0;
600 }
601 }
602 /* drive was found */
603 }
604 if(!drive->present)
605 return 0;
606 /* The drive wasn't being helpful. Add generic info only */
607 if (drive->id_read == 0) {
608 generic_id(drive);
609 return 1;
610 }
611
612 if (drive->media == ide_disk) {
613 ide_disk_init_chs(drive);
614 ide_disk_init_mult_count(drive);
615 }
616
617 return drive->present;
618 }
619
620 static void hwif_release_dev (struct device *dev)
621 {
622 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
623
624 complete(&hwif->gendev_rel_comp);
625 }
626
627 static int ide_register_port(ide_hwif_t *hwif)
628 {
629 int ret;
630
631 /* register with global device tree */
632 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
633 hwif->gendev.driver_data = hwif;
634 if (hwif->gendev.parent == NULL) {
635 if (hwif->dev)
636 hwif->gendev.parent = hwif->dev;
637 else
638 /* Would like to do = &device_legacy */
639 hwif->gendev.parent = NULL;
640 }
641 hwif->gendev.release = hwif_release_dev;
642 ret = device_register(&hwif->gendev);
643 if (ret < 0) {
644 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
645 __func__, ret);
646 goto out;
647 }
648
649 get_device(&hwif->gendev);
650
651 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
652 MKDEV(0, 0), hwif->name);
653 if (IS_ERR(hwif->portdev)) {
654 ret = PTR_ERR(hwif->portdev);
655 device_unregister(&hwif->gendev);
656 }
657 dev_set_drvdata(hwif->portdev, hwif);
658 out:
659 return ret;
660 }
661
662 /**
663 * ide_port_wait_ready - wait for port to become ready
664 * @hwif: IDE port
665 *
666 * This is needed on some PPCs and a bunch of BIOS-less embedded
667 * platforms. Typical cases are:
668 *
669 * - The firmware hard reset the disk before booting the kernel,
670 * the drive is still doing it's poweron-reset sequence, that
671 * can take up to 30 seconds.
672 *
673 * - The firmware does nothing (or no firmware), the device is
674 * still in POST state (same as above actually).
675 *
676 * - Some CD/DVD/Writer combo drives tend to drive the bus during
677 * their reset sequence even when they are non-selected slave
678 * devices, thus preventing discovery of the main HD.
679 *
680 * Doing this wait-for-non-busy should not harm any existing
681 * configuration and fix some issues like the above.
682 *
683 * BenH.
684 *
685 * Returns 0 on success, error code (< 0) otherwise.
686 */
687
688 static int ide_port_wait_ready(ide_hwif_t *hwif)
689 {
690 int unit, rc;
691
692 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
693
694 /* Let HW settle down a bit from whatever init state we
695 * come from */
696 mdelay(2);
697
698 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
699 * I know of at least one disk who takes 31 seconds, I use 35
700 * here to be safe
701 */
702 rc = ide_wait_not_busy(hwif, 35000);
703 if (rc)
704 return rc;
705
706 /* Now make sure both master & slave are ready */
707 for (unit = 0; unit < MAX_DRIVES; unit++) {
708 ide_drive_t *drive = &hwif->drives[unit];
709
710 /* Ignore disks that we will not probe for later. */
711 if (!drive->noprobe || drive->present) {
712 SELECT_DRIVE(drive);
713 ide_set_irq(drive, 1);
714 mdelay(2);
715 rc = ide_wait_not_busy(hwif, 35000);
716 if (rc)
717 goto out;
718 } else
719 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
720 drive->name);
721 }
722 out:
723 /* Exit function with master reselected (let's be sane) */
724 if (unit)
725 SELECT_DRIVE(&hwif->drives[0]);
726
727 return rc;
728 }
729
730 /**
731 * ide_undecoded_slave - look for bad CF adapters
732 * @drive1: drive
733 *
734 * Analyse the drives on the interface and attempt to decide if we
735 * have the same drive viewed twice. This occurs with crap CF adapters
736 * and PCMCIA sometimes.
737 */
738
739 void ide_undecoded_slave(ide_drive_t *drive1)
740 {
741 ide_drive_t *drive0 = &drive1->hwif->drives[0];
742
743 if ((drive1->dn & 1) == 0 || drive0->present == 0)
744 return;
745
746 /* If the models don't match they are not the same product */
747 if (strcmp(drive0->id->model, drive1->id->model))
748 return;
749
750 /* Serial numbers do not match */
751 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
752 return;
753
754 /* No serial number, thankfully very rare for CF */
755 if (drive0->id->serial_no[0] == 0)
756 return;
757
758 /* Appears to be an IDE flash adapter with decode bugs */
759 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
760
761 drive1->present = 0;
762 }
763
764 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
765
766 static int ide_probe_port(ide_hwif_t *hwif)
767 {
768 unsigned long flags;
769 unsigned int irqd;
770 int unit, rc = -ENODEV;
771
772 BUG_ON(hwif->present);
773
774 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
775 return -EACCES;
776
777 /*
778 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
779 * we'll install our IRQ driver much later...
780 */
781 irqd = hwif->irq;
782 if (irqd)
783 disable_irq(hwif->irq);
784
785 local_irq_set(flags);
786
787 if (ide_port_wait_ready(hwif) == -EBUSY)
788 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
789
790 /*
791 * Second drive should only exist if first drive was found,
792 * but a lot of cdrom drives are configured as single slaves.
793 */
794 for (unit = 0; unit < MAX_DRIVES; ++unit) {
795 ide_drive_t *drive = &hwif->drives[unit];
796 drive->dn = (hwif->channel ? 2 : 0) + unit;
797 (void) probe_for_drive(drive);
798 if (drive->present)
799 rc = 0;
800 }
801
802 local_irq_restore(flags);
803
804 /*
805 * Use cached IRQ number. It might be (and is...) changed by probe
806 * code above
807 */
808 if (irqd)
809 enable_irq(irqd);
810
811 return rc;
812 }
813
814 static void ide_port_tune_devices(ide_hwif_t *hwif)
815 {
816 const struct ide_port_ops *port_ops = hwif->port_ops;
817 int unit;
818
819 for (unit = 0; unit < MAX_DRIVES; unit++) {
820 ide_drive_t *drive = &hwif->drives[unit];
821
822 if (drive->present && port_ops && port_ops->quirkproc)
823 port_ops->quirkproc(drive);
824 }
825
826 for (unit = 0; unit < MAX_DRIVES; ++unit) {
827 ide_drive_t *drive = &hwif->drives[unit];
828
829 if (drive->present) {
830 ide_set_max_pio(drive);
831
832 drive->nice1 = 1;
833
834 if (hwif->dma_ops)
835 ide_set_dma(drive);
836 }
837 }
838
839 for (unit = 0; unit < MAX_DRIVES; ++unit) {
840 ide_drive_t *drive = &hwif->drives[unit];
841
842 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
843 drive->no_io_32bit = 1;
844 else
845 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
846 }
847 }
848
849 #if MAX_HWIFS > 1
850 /*
851 * save_match() is used to simplify logic in init_irq() below.
852 *
853 * A loophole here is that we may not know about a particular
854 * hwif's irq until after that hwif is actually probed/initialized..
855 * This could be a problem for the case where an hwif is on a
856 * dual interface that requires serialization (eg. cmd640) and another
857 * hwif using one of the same irqs is initialized beforehand.
858 *
859 * This routine detects and reports such situations, but does not fix them.
860 */
861 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
862 {
863 ide_hwif_t *m = *match;
864
865 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
866 if (!new->hwgroup)
867 return;
868 printk("%s: potential irq problem with %s and %s\n",
869 hwif->name, new->name, m->name);
870 }
871 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
872 *match = new;
873 }
874 #endif /* MAX_HWIFS > 1 */
875
876 /*
877 * init request queue
878 */
879 static int ide_init_queue(ide_drive_t *drive)
880 {
881 struct request_queue *q;
882 ide_hwif_t *hwif = HWIF(drive);
883 int max_sectors = 256;
884 int max_sg_entries = PRD_ENTRIES;
885
886 /*
887 * Our default set up assumes the normal IDE case,
888 * that is 64K segmenting, standard PRD setup
889 * and LBA28. Some drivers then impose their own
890 * limits and LBA48 we could raise it but as yet
891 * do not.
892 */
893
894 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
895 if (!q)
896 return 1;
897
898 q->queuedata = drive;
899 blk_queue_segment_boundary(q, 0xffff);
900
901 if (hwif->rqsize < max_sectors)
902 max_sectors = hwif->rqsize;
903 blk_queue_max_sectors(q, max_sectors);
904
905 #ifdef CONFIG_PCI
906 /* When we have an IOMMU, we may have a problem where pci_map_sg()
907 * creates segments that don't completely match our boundary
908 * requirements and thus need to be broken up again. Because it
909 * doesn't align properly either, we may actually have to break up
910 * to more segments than what was we got in the first place, a max
911 * worst case is twice as many.
912 * This will be fixed once we teach pci_map_sg() about our boundary
913 * requirements, hopefully soon. *FIXME*
914 */
915 if (!PCI_DMA_BUS_IS_PHYS)
916 max_sg_entries >>= 1;
917 #endif /* CONFIG_PCI */
918
919 blk_queue_max_hw_segments(q, max_sg_entries);
920 blk_queue_max_phys_segments(q, max_sg_entries);
921
922 /* assign drive queue */
923 drive->queue = q;
924
925 /* needs drive->queue to be set */
926 ide_toggle_bounce(drive, 1);
927
928 return 0;
929 }
930
931 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
932 {
933 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
934
935 spin_lock_irq(&ide_lock);
936 if (!hwgroup->drive) {
937 /* first drive for hwgroup. */
938 drive->next = drive;
939 hwgroup->drive = drive;
940 hwgroup->hwif = HWIF(hwgroup->drive);
941 } else {
942 drive->next = hwgroup->drive->next;
943 hwgroup->drive->next = drive;
944 }
945 spin_unlock_irq(&ide_lock);
946 }
947
948 /*
949 * For any present drive:
950 * - allocate the block device queue
951 * - link drive into the hwgroup
952 */
953 static void ide_port_setup_devices(ide_hwif_t *hwif)
954 {
955 int i;
956
957 mutex_lock(&ide_cfg_mtx);
958 for (i = 0; i < MAX_DRIVES; i++) {
959 ide_drive_t *drive = &hwif->drives[i];
960
961 if (!drive->present)
962 continue;
963
964 if (ide_init_queue(drive)) {
965 printk(KERN_ERR "ide: failed to init %s\n",
966 drive->name);
967 continue;
968 }
969
970 ide_add_drive_to_hwgroup(drive);
971 }
972 mutex_unlock(&ide_cfg_mtx);
973 }
974
975 /*
976 * This routine sets up the irq for an ide interface, and creates a new
977 * hwgroup for the irq/hwif if none was previously assigned.
978 *
979 * Much of the code is for correctly detecting/handling irq sharing
980 * and irq serialization situations. This is somewhat complex because
981 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
982 */
983 static int init_irq (ide_hwif_t *hwif)
984 {
985 struct ide_io_ports *io_ports = &hwif->io_ports;
986 unsigned int index;
987 ide_hwgroup_t *hwgroup;
988 ide_hwif_t *match = NULL;
989
990
991 BUG_ON(in_interrupt());
992 BUG_ON(irqs_disabled());
993 BUG_ON(hwif == NULL);
994
995 mutex_lock(&ide_cfg_mtx);
996 hwif->hwgroup = NULL;
997 #if MAX_HWIFS > 1
998 /*
999 * Group up with any other hwifs that share our irq(s).
1000 */
1001 for (index = 0; index < MAX_HWIFS; index++) {
1002 ide_hwif_t *h = &ide_hwifs[index];
1003 if (h->hwgroup) { /* scan only initialized hwif's */
1004 if (hwif->irq == h->irq) {
1005 hwif->sharing_irq = h->sharing_irq = 1;
1006 if (hwif->chipset != ide_pci ||
1007 h->chipset != ide_pci) {
1008 save_match(hwif, h, &match);
1009 }
1010 }
1011 if (hwif->serialized) {
1012 if (hwif->mate && hwif->mate->irq == h->irq)
1013 save_match(hwif, h, &match);
1014 }
1015 if (h->serialized) {
1016 if (h->mate && hwif->irq == h->mate->irq)
1017 save_match(hwif, h, &match);
1018 }
1019 }
1020 }
1021 #endif /* MAX_HWIFS > 1 */
1022 /*
1023 * If we are still without a hwgroup, then form a new one
1024 */
1025 if (match) {
1026 hwgroup = match->hwgroup;
1027 hwif->hwgroup = hwgroup;
1028 /*
1029 * Link us into the hwgroup.
1030 * This must be done early, do ensure that unexpected_intr
1031 * can find the hwif and prevent irq storms.
1032 * No drives are attached to the new hwif, choose_drive
1033 * can't do anything stupid (yet).
1034 * Add ourself as the 2nd entry to the hwgroup->hwif
1035 * linked list, the first entry is the hwif that owns
1036 * hwgroup->handler - do not change that.
1037 */
1038 spin_lock_irq(&ide_lock);
1039 hwif->next = hwgroup->hwif->next;
1040 hwgroup->hwif->next = hwif;
1041 BUG_ON(hwif->next == hwif);
1042 spin_unlock_irq(&ide_lock);
1043 } else {
1044 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1045 hwif_to_node(hwif));
1046 if (hwgroup == NULL)
1047 goto out_up;
1048
1049 hwif->hwgroup = hwgroup;
1050 hwgroup->hwif = hwif->next = hwif;
1051
1052 init_timer(&hwgroup->timer);
1053 hwgroup->timer.function = &ide_timer_expiry;
1054 hwgroup->timer.data = (unsigned long) hwgroup;
1055 }
1056
1057 /*
1058 * Allocate the irq, if not already obtained for another hwif
1059 */
1060 if (!match || match->irq != hwif->irq) {
1061 int sa = 0;
1062 #if defined(__mc68000__)
1063 sa = IRQF_SHARED;
1064 #endif /* __mc68000__ */
1065
1066 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1067 sa = IRQF_SHARED;
1068
1069 if (io_ports->ctl_addr)
1070 /* clear nIEN */
1071 hwif->OUTB(0x08, io_ports->ctl_addr);
1072
1073 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1074 goto out_unlink;
1075 }
1076
1077 if (!hwif->rqsize) {
1078 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1079 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1080 hwif->rqsize = 256;
1081 else
1082 hwif->rqsize = 65536;
1083 }
1084
1085 #if !defined(__mc68000__)
1086 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1087 io_ports->data_addr, io_ports->status_addr,
1088 io_ports->ctl_addr, hwif->irq);
1089 #else
1090 printk("%s at 0x%08lx on irq %d", hwif->name,
1091 io_ports->data_addr, hwif->irq);
1092 #endif /* __mc68000__ */
1093 if (match)
1094 printk(" (%sed with %s)",
1095 hwif->sharing_irq ? "shar" : "serializ", match->name);
1096 printk("\n");
1097
1098 mutex_unlock(&ide_cfg_mtx);
1099 return 0;
1100 out_unlink:
1101 ide_remove_port_from_hwgroup(hwif);
1102 out_up:
1103 mutex_unlock(&ide_cfg_mtx);
1104 return 1;
1105 }
1106
1107 static int ata_lock(dev_t dev, void *data)
1108 {
1109 /* FIXME: we want to pin hwif down */
1110 return 0;
1111 }
1112
1113 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1114 {
1115 ide_hwif_t *hwif = data;
1116 int unit = *part >> PARTN_BITS;
1117 ide_drive_t *drive = &hwif->drives[unit];
1118 if (!drive->present)
1119 return NULL;
1120
1121 if (drive->media == ide_disk)
1122 request_module("ide-disk");
1123 if (drive->scsi)
1124 request_module("ide-scsi");
1125 if (drive->media == ide_cdrom || drive->media == ide_optical)
1126 request_module("ide-cd");
1127 if (drive->media == ide_tape)
1128 request_module("ide-tape");
1129 if (drive->media == ide_floppy)
1130 request_module("ide-floppy");
1131
1132 return NULL;
1133 }
1134
1135 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1136 {
1137 struct gendisk *p = data;
1138 *part &= (1 << PARTN_BITS) - 1;
1139 return &p->dev.kobj;
1140 }
1141
1142 static int exact_lock(dev_t dev, void *data)
1143 {
1144 struct gendisk *p = data;
1145
1146 if (!get_disk(p))
1147 return -1;
1148 return 0;
1149 }
1150
1151 void ide_register_region(struct gendisk *disk)
1152 {
1153 blk_register_region(MKDEV(disk->major, disk->first_minor),
1154 disk->minors, NULL, exact_match, exact_lock, disk);
1155 }
1156
1157 EXPORT_SYMBOL_GPL(ide_register_region);
1158
1159 void ide_unregister_region(struct gendisk *disk)
1160 {
1161 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1162 disk->minors);
1163 }
1164
1165 EXPORT_SYMBOL_GPL(ide_unregister_region);
1166
1167 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1168 {
1169 ide_hwif_t *hwif = drive->hwif;
1170 unsigned int unit = (drive->select.all >> 4) & 1;
1171
1172 disk->major = hwif->major;
1173 disk->first_minor = unit << PARTN_BITS;
1174 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1175 disk->queue = drive->queue;
1176 }
1177
1178 EXPORT_SYMBOL_GPL(ide_init_disk);
1179
1180 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1181 {
1182 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1183
1184 if (drive == drive->next) {
1185 /* special case: last drive from hwgroup. */
1186 BUG_ON(hwgroup->drive != drive);
1187 hwgroup->drive = NULL;
1188 } else {
1189 ide_drive_t *walk;
1190
1191 walk = hwgroup->drive;
1192 while (walk->next != drive)
1193 walk = walk->next;
1194 walk->next = drive->next;
1195 if (hwgroup->drive == drive) {
1196 hwgroup->drive = drive->next;
1197 hwgroup->hwif = hwgroup->drive->hwif;
1198 }
1199 }
1200 BUG_ON(hwgroup->drive == drive);
1201 }
1202
1203 static void drive_release_dev (struct device *dev)
1204 {
1205 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1206
1207 ide_proc_unregister_device(drive);
1208
1209 spin_lock_irq(&ide_lock);
1210 ide_remove_drive_from_hwgroup(drive);
1211 kfree(drive->id);
1212 drive->id = NULL;
1213 drive->present = 0;
1214 /* Messed up locking ... */
1215 spin_unlock_irq(&ide_lock);
1216 blk_cleanup_queue(drive->queue);
1217 spin_lock_irq(&ide_lock);
1218 drive->queue = NULL;
1219 spin_unlock_irq(&ide_lock);
1220
1221 complete(&drive->gendev_rel_comp);
1222 }
1223
1224 #ifndef ide_default_irq
1225 #define ide_default_irq(irq) 0
1226 #endif
1227
1228 static int hwif_init(ide_hwif_t *hwif)
1229 {
1230 int old_irq;
1231
1232 if (!hwif->irq) {
1233 hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1234 if (!hwif->irq) {
1235 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1236 return 0;
1237 }
1238 }
1239
1240 if (register_blkdev(hwif->major, hwif->name))
1241 return 0;
1242
1243 if (!hwif->sg_max_nents)
1244 hwif->sg_max_nents = PRD_ENTRIES;
1245
1246 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1247 GFP_KERNEL);
1248 if (!hwif->sg_table) {
1249 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1250 goto out;
1251 }
1252
1253 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1254
1255 if (init_irq(hwif) == 0)
1256 goto done;
1257
1258 old_irq = hwif->irq;
1259 /*
1260 * It failed to initialise. Find the default IRQ for
1261 * this port and try that.
1262 */
1263 hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1264 if (!hwif->irq) {
1265 printk("%s: Disabled unable to get IRQ %d.\n",
1266 hwif->name, old_irq);
1267 goto out;
1268 }
1269 if (init_irq(hwif)) {
1270 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1271 hwif->name, old_irq, hwif->irq);
1272 goto out;
1273 }
1274 printk("%s: probed IRQ %d failed, using default.\n",
1275 hwif->name, hwif->irq);
1276
1277 done:
1278 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1279 THIS_MODULE, ata_probe, ata_lock, hwif);
1280 return 1;
1281
1282 out:
1283 unregister_blkdev(hwif->major, hwif->name);
1284 return 0;
1285 }
1286
1287 static void hwif_register_devices(ide_hwif_t *hwif)
1288 {
1289 unsigned int i;
1290
1291 for (i = 0; i < MAX_DRIVES; i++) {
1292 ide_drive_t *drive = &hwif->drives[i];
1293 struct device *dev = &drive->gendev;
1294 int ret;
1295
1296 if (!drive->present)
1297 continue;
1298
1299 ide_add_generic_settings(drive);
1300
1301 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1302 dev->parent = &hwif->gendev;
1303 dev->bus = &ide_bus_type;
1304 dev->driver_data = drive;
1305 dev->release = drive_release_dev;
1306
1307 ret = device_register(dev);
1308 if (ret < 0)
1309 printk(KERN_WARNING "IDE: %s: device_register error: "
1310 "%d\n", __func__, ret);
1311 }
1312 }
1313
1314 static void ide_port_init_devices(ide_hwif_t *hwif)
1315 {
1316 const struct ide_port_ops *port_ops = hwif->port_ops;
1317 int i;
1318
1319 for (i = 0; i < MAX_DRIVES; i++) {
1320 ide_drive_t *drive = &hwif->drives[i];
1321
1322 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1323 drive->io_32bit = 1;
1324 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1325 drive->unmask = 1;
1326 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1327 drive->no_unmask = 1;
1328 }
1329
1330 if (port_ops && port_ops->port_init_devs)
1331 port_ops->port_init_devs(hwif);
1332 }
1333
1334 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1335 const struct ide_port_info *d)
1336 {
1337 if (d->chipset != ide_etrax100)
1338 hwif->channel = port;
1339
1340 if (d->chipset)
1341 hwif->chipset = d->chipset;
1342
1343 if (d->init_iops)
1344 d->init_iops(hwif);
1345
1346 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1347 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1348 hwif->irq = port ? 15 : 14;
1349
1350 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1351 hwif->host_flags |= d->host_flags;
1352 hwif->pio_mask = d->pio_mask;
1353
1354 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1355 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1356 hwif->port_ops = d->port_ops;
1357
1358 hwif->swdma_mask = d->swdma_mask;
1359 hwif->mwdma_mask = d->mwdma_mask;
1360 hwif->ultra_mask = d->udma_mask;
1361
1362 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1363 int rc;
1364
1365 if (d->init_dma)
1366 rc = d->init_dma(hwif, d);
1367 else
1368 rc = ide_hwif_setup_dma(hwif, d);
1369
1370 if (rc < 0) {
1371 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1372 hwif->swdma_mask = 0;
1373 hwif->mwdma_mask = 0;
1374 hwif->ultra_mask = 0;
1375 } else if (d->dma_ops)
1376 hwif->dma_ops = d->dma_ops;
1377 }
1378
1379 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1380 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1381 if (hwif->mate)
1382 hwif->mate->serialized = hwif->serialized = 1;
1383 }
1384
1385 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1386 hwif->rqsize = 256;
1387
1388 /* call chipset specific routine for each enabled port */
1389 if (d->init_hwif)
1390 d->init_hwif(hwif);
1391 }
1392
1393 static void ide_port_cable_detect(ide_hwif_t *hwif)
1394 {
1395 const struct ide_port_ops *port_ops = hwif->port_ops;
1396
1397 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1398 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1399 hwif->cbl = port_ops->cable_detect(hwif);
1400 }
1401 }
1402
1403 static ssize_t store_delete_devices(struct device *portdev,
1404 struct device_attribute *attr,
1405 const char *buf, size_t n)
1406 {
1407 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1408
1409 if (strncmp(buf, "1", n))
1410 return -EINVAL;
1411
1412 ide_port_unregister_devices(hwif);
1413
1414 return n;
1415 };
1416
1417 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1418
1419 static ssize_t store_scan(struct device *portdev,
1420 struct device_attribute *attr,
1421 const char *buf, size_t n)
1422 {
1423 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1424
1425 if (strncmp(buf, "1", n))
1426 return -EINVAL;
1427
1428 ide_port_unregister_devices(hwif);
1429 ide_port_scan(hwif);
1430
1431 return n;
1432 };
1433
1434 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1435
1436 static struct device_attribute *ide_port_attrs[] = {
1437 &dev_attr_delete_devices,
1438 &dev_attr_scan,
1439 NULL
1440 };
1441
1442 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1443 {
1444 int i, rc;
1445
1446 for (i = 0; ide_port_attrs[i]; i++) {
1447 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1448 if (rc)
1449 break;
1450 }
1451
1452 return rc;
1453 }
1454
1455 /**
1456 * ide_find_port_slot - find free ide_hwifs[] slot
1457 * @d: IDE port info
1458 *
1459 * Return the new hwif. If we are out of free slots return NULL.
1460 */
1461
1462 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1463 {
1464 ide_hwif_t *hwif;
1465 int i;
1466 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1467
1468 /*
1469 * Claim an unassigned slot.
1470 *
1471 * Give preference to claiming other slots before claiming ide0/ide1,
1472 * just in case there's another interface yet-to-be-scanned
1473 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1474 *
1475 * Unless there is a bootable card that does not use the standard
1476 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1477 */
1478 if (bootable) {
1479 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1480
1481 for (; i < MAX_HWIFS; i++) {
1482 hwif = &ide_hwifs[i];
1483 if (hwif->chipset == ide_unknown)
1484 return hwif;
1485 }
1486 } else {
1487 for (i = 2; i < MAX_HWIFS; i++) {
1488 hwif = &ide_hwifs[i];
1489 if (hwif->chipset == ide_unknown)
1490 return hwif;
1491 }
1492 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1493 hwif = &ide_hwifs[i];
1494 if (hwif->chipset == ide_unknown)
1495 return hwif;
1496 }
1497 }
1498
1499 return NULL;
1500 }
1501 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1502
1503 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1504 {
1505 ide_hwif_t *hwif, *mate = NULL;
1506 int i, rc = 0;
1507
1508 for (i = 0; i < MAX_HWIFS; i++) {
1509 if (idx[i] == 0xff) {
1510 mate = NULL;
1511 continue;
1512 }
1513
1514 hwif = &ide_hwifs[idx[i]];
1515
1516 ide_port_apply_params(hwif);
1517
1518 if (d == NULL) {
1519 mate = NULL;
1520 continue;
1521 }
1522
1523 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1524 hwif->mate = mate;
1525 mate->mate = hwif;
1526 }
1527
1528 mate = (i & 1) ? NULL : hwif;
1529
1530 ide_init_port(hwif, i & 1, d);
1531 ide_port_cable_detect(hwif);
1532 ide_port_init_devices(hwif);
1533 }
1534
1535 for (i = 0; i < MAX_HWIFS; i++) {
1536 if (idx[i] == 0xff)
1537 continue;
1538
1539 hwif = &ide_hwifs[idx[i]];
1540
1541 if (ide_probe_port(hwif) == 0)
1542 hwif->present = 1;
1543
1544 if (hwif->chipset != ide_4drives || !hwif->mate ||
1545 !hwif->mate->present)
1546 ide_register_port(hwif);
1547
1548 if (hwif->present)
1549 ide_port_tune_devices(hwif);
1550 }
1551
1552 for (i = 0; i < MAX_HWIFS; i++) {
1553 if (idx[i] == 0xff)
1554 continue;
1555
1556 hwif = &ide_hwifs[idx[i]];
1557
1558 if (hwif_init(hwif) == 0) {
1559 printk(KERN_INFO "%s: failed to initialize IDE "
1560 "interface\n", hwif->name);
1561 hwif->present = 0;
1562 rc = -1;
1563 continue;
1564 }
1565
1566 if (hwif->present)
1567 ide_port_setup_devices(hwif);
1568
1569 ide_acpi_init(hwif);
1570
1571 if (hwif->present)
1572 ide_acpi_port_init_devices(hwif);
1573 }
1574
1575 for (i = 0; i < MAX_HWIFS; i++) {
1576 if (idx[i] == 0xff)
1577 continue;
1578
1579 hwif = &ide_hwifs[idx[i]];
1580
1581 if (hwif->chipset == ide_unknown)
1582 hwif->chipset = ide_generic;
1583
1584 if (hwif->present)
1585 hwif_register_devices(hwif);
1586 }
1587
1588 for (i = 0; i < MAX_HWIFS; i++) {
1589 if (idx[i] == 0xff)
1590 continue;
1591
1592 hwif = &ide_hwifs[idx[i]];
1593
1594 ide_sysfs_register_port(hwif);
1595 ide_proc_register_port(hwif);
1596
1597 if (hwif->present)
1598 ide_proc_port_register_devices(hwif);
1599 }
1600
1601 return rc;
1602 }
1603 EXPORT_SYMBOL_GPL(ide_device_add_all);
1604
1605 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1606 {
1607 u8 idx_all[MAX_HWIFS];
1608 int i;
1609
1610 for (i = 0; i < MAX_HWIFS; i++)
1611 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1612
1613 return ide_device_add_all(idx_all, d);
1614 }
1615 EXPORT_SYMBOL_GPL(ide_device_add);
1616
1617 void ide_port_scan(ide_hwif_t *hwif)
1618 {
1619 ide_port_apply_params(hwif);
1620 ide_port_cable_detect(hwif);
1621 ide_port_init_devices(hwif);
1622
1623 if (ide_probe_port(hwif) < 0)
1624 return;
1625
1626 hwif->present = 1;
1627
1628 ide_port_tune_devices(hwif);
1629 ide_acpi_port_init_devices(hwif);
1630 ide_port_setup_devices(hwif);
1631 hwif_register_devices(hwif);
1632 ide_proc_port_register_devices(hwif);
1633 }
1634 EXPORT_SYMBOL_GPL(ide_port_scan);
1635
1636 static void ide_legacy_init_one(u8 *idx, hw_regs_t *hw, u8 port_no,
1637 const struct ide_port_info *d,
1638 unsigned long config)
1639 {
1640 ide_hwif_t *hwif;
1641 unsigned long base, ctl;
1642 int irq;
1643
1644 if (port_no == 0) {
1645 base = 0x1f0;
1646 ctl = 0x3f6;
1647 irq = 14;
1648 } else {
1649 base = 0x170;
1650 ctl = 0x376;
1651 irq = 15;
1652 }
1653
1654 if (!request_region(base, 8, d->name)) {
1655 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1656 d->name, base, base + 7);
1657 return;
1658 }
1659
1660 if (!request_region(ctl, 1, d->name)) {
1661 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1662 d->name, ctl);
1663 release_region(base, 8);
1664 return;
1665 }
1666
1667 ide_std_init_ports(hw, base, ctl);
1668 hw->irq = irq;
1669
1670 hwif = ide_find_port_slot(d);
1671 if (hwif) {
1672 ide_init_port_hw(hwif, hw);
1673 if (config)
1674 hwif->config_data = config;
1675 idx[port_no] = hwif->index;
1676 }
1677 }
1678
1679 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1680 {
1681 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
1682 hw_regs_t hw[2];
1683
1684 memset(&hw, 0, sizeof(hw));
1685
1686 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1687 ide_legacy_init_one(idx, &hw[0], 0, d, config);
1688 ide_legacy_init_one(idx, &hw[1], 1, d, config);
1689
1690 if (idx[0] == 0xff && idx[1] == 0xff &&
1691 (d->host_flags & IDE_HFLAG_SINGLE))
1692 return -ENOENT;
1693
1694 ide_device_add(idx, d);
1695
1696 return 0;
1697 }
1698 EXPORT_SYMBOL_GPL(ide_legacy_device_add);
Support for the Chinese Samsung S3C2440 based development boards