1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
10 *
11 * See linux/MAINTAINERS for address of current maintainer.
12 *
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
14 *
15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16 * by Andrea Arcangeli
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
45 *
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
49 */
50
generic_id(ide_drive_t * drive)51 static void generic_id(ide_drive_t *drive)
52 {
53 u16 *id = drive->id;
54
55 id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
56 id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
57 id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
58 }
59
ide_disk_init_chs(ide_drive_t * drive)60 static void ide_disk_init_chs(ide_drive_t *drive)
61 {
62 u16 *id = drive->id;
63
64 /* Extract geometry if we did not already have one for the drive */
65 if (!drive->cyl || !drive->head || !drive->sect) {
66 drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS];
67 drive->head = drive->bios_head = id[ATA_ID_HEADS];
68 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
69 }
70
71 /* Handle logical geometry translation by the drive */
72 if (ata_id_current_chs_valid(id)) {
73 drive->cyl = id[ATA_ID_CUR_CYLS];
74 drive->head = id[ATA_ID_CUR_HEADS];
75 drive->sect = id[ATA_ID_CUR_SECTORS];
76 }
77
78 /* Use physical geometry if what we have still makes no sense */
79 if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
80 drive->cyl = id[ATA_ID_CYLS];
81 drive->head = id[ATA_ID_HEADS];
82 drive->sect = id[ATA_ID_SECTORS];
83 }
84 }
85
ide_disk_init_mult_count(ide_drive_t * drive)86 static void ide_disk_init_mult_count(ide_drive_t *drive)
87 {
88 u16 *id = drive->id;
89 u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
90
91 if (max_multsect) {
92 if ((max_multsect / 2) > 1)
93 id[ATA_ID_MULTSECT] = max_multsect | 0x100;
94 else
95 id[ATA_ID_MULTSECT] &= ~0x1ff;
96
97 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
98
99 if (drive->mult_req)
100 drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
101 }
102 }
103
ide_classify_ata_dev(ide_drive_t * drive)104 static void ide_classify_ata_dev(ide_drive_t *drive)
105 {
106 u16 *id = drive->id;
107 char *m = (char *)&id[ATA_ID_PROD];
108 int is_cfa = ata_id_is_cfa(id);
109
110 /* CF devices are *not* removable in Linux definition of the term */
111 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
112 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
113
114 drive->media = ide_disk;
115
116 if (!ata_id_has_unload(drive->id))
117 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
118
119 printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
120 is_cfa ? "CFA" : "ATA");
121 }
122
ide_classify_atapi_dev(ide_drive_t * drive)123 static void ide_classify_atapi_dev(ide_drive_t *drive)
124 {
125 u16 *id = drive->id;
126 char *m = (char *)&id[ATA_ID_PROD];
127 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
128
129 printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
130 switch (type) {
131 case ide_floppy:
132 if (!strstr(m, "CD-ROM")) {
133 if (!strstr(m, "oppy") &&
134 !strstr(m, "poyp") &&
135 !strstr(m, "ZIP"))
136 printk(KERN_CONT "cdrom or floppy?, assuming ");
137 if (drive->media != ide_cdrom) {
138 printk(KERN_CONT "FLOPPY");
139 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
140 break;
141 }
142 }
143 /* Early cdrom models used zero */
144 type = ide_cdrom;
145 case ide_cdrom:
146 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
147 #ifdef CONFIG_PPC
148 /* kludge for Apple PowerBook internal zip */
149 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
150 printk(KERN_CONT "FLOPPY");
151 type = ide_floppy;
152 break;
153 }
154 #endif
155 printk(KERN_CONT "CD/DVD-ROM");
156 break;
157 case ide_tape:
158 printk(KERN_CONT "TAPE");
159 break;
160 case ide_optical:
161 printk(KERN_CONT "OPTICAL");
162 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
163 break;
164 default:
165 printk(KERN_CONT "UNKNOWN (type %d)", type);
166 break;
167 }
168
169 printk(KERN_CONT " drive\n");
170 drive->media = type;
171 /* an ATAPI device ignores DRDY */
172 drive->ready_stat = 0;
173 if (ata_id_cdb_intr(id))
174 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
175 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
176 /* we don't do head unloading on ATAPI devices */
177 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
178 }
179
180 /**
181 * do_identify - identify a drive
182 * @drive: drive to identify
183 * @cmd: command used
184 * @id: buffer for IDENTIFY data
185 *
186 * Called when we have issued a drive identify command to
187 * read and parse the results. This function is run with
188 * interrupts disabled.
189 */
190
do_identify(ide_drive_t * drive,u8 cmd,u16 * id)191 static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
192 {
193 ide_hwif_t *hwif = drive->hwif;
194 char *m = (char *)&id[ATA_ID_PROD];
195 unsigned long flags;
196 int bswap = 1;
197
198 /* local CPU only; some systems need this */
199 local_irq_save(flags);
200 /* read 512 bytes of id info */
201 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
202 local_irq_restore(flags);
203
204 drive->dev_flags |= IDE_DFLAG_ID_READ;
205 #ifdef DEBUG
206 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
207 ide_dump_identify((u8 *)id);
208 #endif
209 ide_fix_driveid(id);
210
211 /*
212 * ATA_CMD_ID_ATA returns little-endian info,
213 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
214 */
215 if (cmd == ATA_CMD_ID_ATAPI) {
216 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
217 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
218 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
219 /* Vertos drives may still be weird */
220 bswap ^= 1;
221 }
222
223 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
224 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
225 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
226
227 /* we depend on this a lot! */
228 m[ATA_ID_PROD_LEN - 1] = '\0';
229
230 if (strstr(m, "E X A B Y T E N E S T"))
231 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
232 else
233 drive->dev_flags |= IDE_DFLAG_PRESENT;
234 }
235
236 /**
237 * ide_dev_read_id - send ATA/ATAPI IDENTIFY command
238 * @drive: drive to identify
239 * @cmd: command to use
240 * @id: buffer for IDENTIFY data
241 * @irq_ctx: flag set when called from the IRQ context
242 *
243 * Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
244 *
245 * Returns: 0 device was identified
246 * 1 device timed-out (no response to identify request)
247 * 2 device aborted the command (refused to identify itself)
248 */
249
ide_dev_read_id(ide_drive_t * drive,u8 cmd,u16 * id,int irq_ctx)250 int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
251 {
252 ide_hwif_t *hwif = drive->hwif;
253 struct ide_io_ports *io_ports = &hwif->io_ports;
254 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
255 int use_altstatus = 0, rc;
256 unsigned long timeout;
257 u8 s = 0, a = 0;
258
259 /*
260 * Disable device IRQ. Otherwise we'll get spurious interrupts
261 * during the identify phase that the IRQ handler isn't expecting.
262 */
263 if (io_ports->ctl_addr)
264 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
265
266 /* take a deep breath */
267 if (irq_ctx)
268 mdelay(50);
269 else
270 msleep(50);
271
272 if (io_ports->ctl_addr &&
273 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
274 a = tp_ops->read_altstatus(hwif);
275 s = tp_ops->read_status(hwif);
276 if ((a ^ s) & ~ATA_IDX)
277 /* ancient Seagate drives, broken interfaces */
278 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
279 "instead of ALTSTATUS(0x%02x)\n",
280 drive->name, s, a);
281 else
282 /* use non-intrusive polling */
283 use_altstatus = 1;
284 }
285
286 /* set features register for atapi
287 * identify command to be sure of reply
288 */
289 if (cmd == ATA_CMD_ID_ATAPI) {
290 struct ide_taskfile tf;
291
292 memset(&tf, 0, sizeof(tf));
293 /* disable DMA & overlap */
294 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
295 }
296
297 /* ask drive for ID */
298 tp_ops->exec_command(hwif, cmd);
299
300 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
301
302 /* wait for IRQ and ATA_DRQ */
303 if (irq_ctx) {
304 rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
305 if (rc)
306 return 1;
307 } else {
308 rc = ide_busy_sleep(drive, timeout, use_altstatus);
309 if (rc)
310 return 1;
311
312 msleep(50);
313 s = tp_ops->read_status(hwif);
314 }
315
316 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
317 /* drive returned ID */
318 do_identify(drive, cmd, id);
319 /* drive responded with ID */
320 rc = 0;
321 /* clear drive IRQ */
322 (void)tp_ops->read_status(hwif);
323 } else {
324 /* drive refused ID */
325 rc = 2;
326 }
327 return rc;
328 }
329
ide_busy_sleep(ide_drive_t * drive,unsigned long timeout,int altstatus)330 int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
331 {
332 ide_hwif_t *hwif = drive->hwif;
333 u8 stat;
334
335 timeout += jiffies;
336
337 do {
338 msleep(50); /* give drive a breather */
339 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
340 : hwif->tp_ops->read_status(hwif);
341 if ((stat & ATA_BUSY) == 0)
342 return 0;
343 } while (time_before(jiffies, timeout));
344
345 printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
346
347 return 1; /* drive timed-out */
348 }
349
ide_read_device(ide_drive_t * drive)350 static u8 ide_read_device(ide_drive_t *drive)
351 {
352 struct ide_taskfile tf;
353
354 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
355
356 return tf.device;
357 }
358
359 /**
360 * do_probe - probe an IDE device
361 * @drive: drive to probe
362 * @cmd: command to use
363 *
364 * do_probe() has the difficult job of finding a drive if it exists,
365 * without getting hung up if it doesn't exist, without trampling on
366 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
367 *
368 * If a drive is "known" to exist (from CMOS or kernel parameters),
369 * but does not respond right away, the probe will "hang in there"
370 * for the maximum wait time (about 30 seconds), otherwise it will
371 * exit much more quickly.
372 *
373 * Returns: 0 device was identified
374 * 1 device timed-out (no response to identify request)
375 * 2 device aborted the command (refused to identify itself)
376 * 3 bad status from device (possible for ATAPI drives)
377 * 4 probe was not attempted because failure was obvious
378 */
379
do_probe(ide_drive_t * drive,u8 cmd)380 static int do_probe (ide_drive_t *drive, u8 cmd)
381 {
382 ide_hwif_t *hwif = drive->hwif;
383 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
384 u16 *id = drive->id;
385 int rc;
386 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
387
388 /* avoid waiting for inappropriate probes */
389 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
390 return 4;
391
392 #ifdef DEBUG
393 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
394 drive->name, present, drive->media,
395 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
396 #endif
397
398 /* needed for some systems
399 * (e.g. crw9624 as drive0 with disk as slave)
400 */
401 msleep(50);
402 tp_ops->dev_select(drive);
403 msleep(50);
404
405 if (ide_read_device(drive) != drive->select && present == 0) {
406 if (drive->dn & 1) {
407 /* exit with drive0 selected */
408 tp_ops->dev_select(hwif->devices[0]);
409 /* allow ATA_BUSY to assert & clear */
410 msleep(50);
411 }
412 /* no i/f present: mmm.. this should be a 4 -ml */
413 return 3;
414 }
415
416 stat = tp_ops->read_status(hwif);
417
418 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
419 present || cmd == ATA_CMD_ID_ATAPI) {
420 rc = ide_dev_read_id(drive, cmd, id, 0);
421 if (rc)
422 /* failed: try again */
423 rc = ide_dev_read_id(drive, cmd, id, 0);
424
425 stat = tp_ops->read_status(hwif);
426
427 if (stat == (ATA_BUSY | ATA_DRDY))
428 return 4;
429
430 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
431 printk(KERN_ERR "%s: no response (status = 0x%02x), "
432 "resetting drive\n", drive->name, stat);
433 msleep(50);
434 tp_ops->dev_select(drive);
435 msleep(50);
436 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
437 (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
438 rc = ide_dev_read_id(drive, cmd, id, 0);
439 }
440
441 /* ensure drive IRQ is clear */
442 stat = tp_ops->read_status(hwif);
443
444 if (rc == 1)
445 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
446 drive->name, stat);
447 } else {
448 /* not present or maybe ATAPI */
449 rc = 3;
450 }
451 if (drive->dn & 1) {
452 /* exit with drive0 selected */
453 tp_ops->dev_select(hwif->devices[0]);
454 msleep(50);
455 /* ensure drive irq is clear */
456 (void)tp_ops->read_status(hwif);
457 }
458 return rc;
459 }
460
461 /**
462 * probe_for_drives - upper level drive probe
463 * @drive: drive to probe for
464 *
465 * probe_for_drive() tests for existence of a given drive using do_probe()
466 * and presents things to the user as needed.
467 *
468 * Returns: 0 no device was found
469 * 1 device was found
470 * (note: IDE_DFLAG_PRESENT might still be not set)
471 */
472
probe_for_drive(ide_drive_t * drive)473 static u8 probe_for_drive(ide_drive_t *drive)
474 {
475 char *m;
476 int rc;
477 u8 cmd;
478
479 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
480
481 m = (char *)&drive->id[ATA_ID_PROD];
482 strcpy(m, "UNKNOWN");
483
484 /* skip probing? */
485 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
486 /* if !(success||timed-out) */
487 cmd = ATA_CMD_ID_ATA;
488 rc = do_probe(drive, cmd);
489 if (rc >= 2) {
490 /* look for ATAPI device */
491 cmd = ATA_CMD_ID_ATAPI;
492 rc = do_probe(drive, cmd);
493 }
494
495 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
496 return 0;
497
498 /* identification failed? */
499 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
500 if (drive->media == ide_disk) {
501 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
502 drive->name, drive->cyl,
503 drive->head, drive->sect);
504 } else if (drive->media == ide_cdrom) {
505 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
506 } else {
507 /* nuke it */
508 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
509 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
510 }
511 } else {
512 if (cmd == ATA_CMD_ID_ATAPI)
513 ide_classify_atapi_dev(drive);
514 else
515 ide_classify_ata_dev(drive);
516 }
517 }
518
519 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
520 return 0;
521
522 /* The drive wasn't being helpful. Add generic info only */
523 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
524 generic_id(drive);
525 return 1;
526 }
527
528 if (drive->media == ide_disk) {
529 ide_disk_init_chs(drive);
530 ide_disk_init_mult_count(drive);
531 }
532
533 return 1;
534 }
535
hwif_release_dev(struct device * dev)536 static void hwif_release_dev(struct device *dev)
537 {
538 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
539
540 complete(&hwif->gendev_rel_comp);
541 }
542
ide_register_port(ide_hwif_t * hwif)543 static int ide_register_port(ide_hwif_t *hwif)
544 {
545 int ret;
546
547 /* register with global device tree */
548 dev_set_name(&hwif->gendev, "%s", hwif->name);
549 dev_set_drvdata(&hwif->gendev, hwif);
550 if (hwif->gendev.parent == NULL)
551 hwif->gendev.parent = hwif->dev;
552 hwif->gendev.release = hwif_release_dev;
553
554 ret = device_register(&hwif->gendev);
555 if (ret < 0) {
556 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
557 __func__, ret);
558 goto out;
559 }
560
561 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
562 MKDEV(0, 0), hwif, "%s", hwif->name);
563 if (IS_ERR(hwif->portdev)) {
564 ret = PTR_ERR(hwif->portdev);
565 device_unregister(&hwif->gendev);
566 }
567 out:
568 return ret;
569 }
570
571 /**
572 * ide_port_wait_ready - wait for port to become ready
573 * @hwif: IDE port
574 *
575 * This is needed on some PPCs and a bunch of BIOS-less embedded
576 * platforms. Typical cases are:
577 *
578 * - The firmware hard reset the disk before booting the kernel,
579 * the drive is still doing it's poweron-reset sequence, that
580 * can take up to 30 seconds.
581 *
582 * - The firmware does nothing (or no firmware), the device is
583 * still in POST state (same as above actually).
584 *
585 * - Some CD/DVD/Writer combo drives tend to drive the bus during
586 * their reset sequence even when they are non-selected slave
587 * devices, thus preventing discovery of the main HD.
588 *
589 * Doing this wait-for-non-busy should not harm any existing
590 * configuration and fix some issues like the above.
591 *
592 * BenH.
593 *
594 * Returns 0 on success, error code (< 0) otherwise.
595 */
596
ide_port_wait_ready(ide_hwif_t * hwif)597 static int ide_port_wait_ready(ide_hwif_t *hwif)
598 {
599 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
600 ide_drive_t *drive;
601 int i, rc;
602
603 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
604
605 /* Let HW settle down a bit from whatever init state we
606 * come from */
607 mdelay(2);
608
609 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
610 * I know of at least one disk who takes 31 seconds, I use 35
611 * here to be safe
612 */
613 rc = ide_wait_not_busy(hwif, 35000);
614 if (rc)
615 return rc;
616
617 /* Now make sure both master & slave are ready */
618 ide_port_for_each_dev(i, drive, hwif) {
619 /* Ignore disks that we will not probe for later. */
620 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
621 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
622 tp_ops->dev_select(drive);
623 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
624 mdelay(2);
625 rc = ide_wait_not_busy(hwif, 35000);
626 if (rc)
627 goto out;
628 } else
629 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
630 drive->name);
631 }
632 out:
633 /* Exit function with master reselected (let's be sane) */
634 if (i)
635 tp_ops->dev_select(hwif->devices[0]);
636
637 return rc;
638 }
639
640 /**
641 * ide_undecoded_slave - look for bad CF adapters
642 * @dev1: slave device
643 *
644 * Analyse the drives on the interface and attempt to decide if we
645 * have the same drive viewed twice. This occurs with crap CF adapters
646 * and PCMCIA sometimes.
647 */
648
ide_undecoded_slave(ide_drive_t * dev1)649 void ide_undecoded_slave(ide_drive_t *dev1)
650 {
651 ide_drive_t *dev0 = dev1->hwif->devices[0];
652
653 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
654 return;
655
656 /* If the models don't match they are not the same product */
657 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
658 (char *)&dev1->id[ATA_ID_PROD]))
659 return;
660
661 /* Serial numbers do not match */
662 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
663 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
664 return;
665
666 /* No serial number, thankfully very rare for CF */
667 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
668 return;
669
670 /* Appears to be an IDE flash adapter with decode bugs */
671 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
672
673 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
674 }
675
676 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
677
ide_probe_port(ide_hwif_t * hwif)678 static int ide_probe_port(ide_hwif_t *hwif)
679 {
680 ide_drive_t *drive;
681 unsigned int irqd;
682 int i, rc = -ENODEV;
683
684 BUG_ON(hwif->present);
685
686 if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
687 (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
688 return -EACCES;
689
690 /*
691 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
692 * we'll install our IRQ driver much later...
693 */
694 irqd = hwif->irq;
695 if (irqd)
696 disable_irq(hwif->irq);
697
698 if (ide_port_wait_ready(hwif) == -EBUSY)
699 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
700
701 /*
702 * Second drive should only exist if first drive was found,
703 * but a lot of cdrom drives are configured as single slaves.
704 */
705 ide_port_for_each_dev(i, drive, hwif) {
706 (void) probe_for_drive(drive);
707 if (drive->dev_flags & IDE_DFLAG_PRESENT)
708 rc = 0;
709 }
710
711 /*
712 * Use cached IRQ number. It might be (and is...) changed by probe
713 * code above
714 */
715 if (irqd)
716 enable_irq(irqd);
717
718 return rc;
719 }
720
ide_port_tune_devices(ide_hwif_t * hwif)721 static void ide_port_tune_devices(ide_hwif_t *hwif)
722 {
723 const struct ide_port_ops *port_ops = hwif->port_ops;
724 ide_drive_t *drive;
725 int i;
726
727 ide_port_for_each_present_dev(i, drive, hwif) {
728 ide_check_nien_quirk_list(drive);
729
730 if (port_ops && port_ops->quirkproc)
731 port_ops->quirkproc(drive);
732 }
733
734 ide_port_for_each_present_dev(i, drive, hwif) {
735 ide_set_max_pio(drive);
736
737 drive->dev_flags |= IDE_DFLAG_NICE1;
738
739 if (hwif->dma_ops)
740 ide_set_dma(drive);
741 }
742 }
743
744 /*
745 * init request queue
746 */
ide_init_queue(ide_drive_t * drive)747 static int ide_init_queue(ide_drive_t *drive)
748 {
749 struct request_queue *q;
750 ide_hwif_t *hwif = drive->hwif;
751 int max_sectors = 256;
752 int max_sg_entries = PRD_ENTRIES;
753
754 /*
755 * Our default set up assumes the normal IDE case,
756 * that is 64K segmenting, standard PRD setup
757 * and LBA28. Some drivers then impose their own
758 * limits and LBA48 we could raise it but as yet
759 * do not.
760 */
761
762 q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
763 if (!q)
764 return 1;
765
766 q->queuedata = drive;
767 blk_queue_segment_boundary(q, 0xffff);
768
769 if (hwif->rqsize < max_sectors)
770 max_sectors = hwif->rqsize;
771 blk_queue_max_hw_sectors(q, max_sectors);
772
773 #ifdef CONFIG_PCI
774 /* When we have an IOMMU, we may have a problem where pci_map_sg()
775 * creates segments that don't completely match our boundary
776 * requirements and thus need to be broken up again. Because it
777 * doesn't align properly either, we may actually have to break up
778 * to more segments than what was we got in the first place, a max
779 * worst case is twice as many.
780 * This will be fixed once we teach pci_map_sg() about our boundary
781 * requirements, hopefully soon. *FIXME*
782 */
783 if (!PCI_DMA_BUS_IS_PHYS)
784 max_sg_entries >>= 1;
785 #endif /* CONFIG_PCI */
786
787 blk_queue_max_segments(q, max_sg_entries);
788
789 /* assign drive queue */
790 drive->queue = q;
791
792 /* needs drive->queue to be set */
793 ide_toggle_bounce(drive, 1);
794
795 return 0;
796 }
797
798 static DEFINE_MUTEX(ide_cfg_mtx);
799
800 /*
801 * For any present drive:
802 * - allocate the block device queue
803 */
ide_port_setup_devices(ide_hwif_t * hwif)804 static int ide_port_setup_devices(ide_hwif_t *hwif)
805 {
806 ide_drive_t *drive;
807 int i, j = 0;
808
809 mutex_lock(&ide_cfg_mtx);
810 ide_port_for_each_present_dev(i, drive, hwif) {
811 if (ide_init_queue(drive)) {
812 printk(KERN_ERR "ide: failed to init %s\n",
813 drive->name);
814 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
815 continue;
816 }
817
818 j++;
819 }
820 mutex_unlock(&ide_cfg_mtx);
821
822 return j;
823 }
824
ide_host_enable_irqs(struct ide_host * host)825 static void ide_host_enable_irqs(struct ide_host *host)
826 {
827 ide_hwif_t *hwif;
828 int i;
829
830 ide_host_for_each_port(i, hwif, host) {
831 if (hwif == NULL)
832 continue;
833
834 /* clear any pending IRQs */
835 hwif->tp_ops->read_status(hwif);
836
837 /* unmask IRQs */
838 if (hwif->io_ports.ctl_addr)
839 hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
840 }
841 }
842
843 /*
844 * This routine sets up the IRQ for an IDE interface.
845 */
init_irq(ide_hwif_t * hwif)846 static int init_irq (ide_hwif_t *hwif)
847 {
848 struct ide_io_ports *io_ports = &hwif->io_ports;
849 struct ide_host *host = hwif->host;
850 irq_handler_t irq_handler = host->irq_handler;
851 int sa = host->irq_flags;
852
853 if (irq_handler == NULL)
854 irq_handler = ide_intr;
855
856 if (!host->get_lock)
857 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
858 goto out_up;
859
860 #if !defined(__mc68000__)
861 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
862 io_ports->data_addr, io_ports->status_addr,
863 io_ports->ctl_addr, hwif->irq);
864 #else
865 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
866 io_ports->data_addr, hwif->irq);
867 #endif /* __mc68000__ */
868 if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
869 printk(KERN_CONT " (serialized)");
870 printk(KERN_CONT "\n");
871
872 return 0;
873 out_up:
874 return 1;
875 }
876
ata_lock(dev_t dev,void * data)877 static int ata_lock(dev_t dev, void *data)
878 {
879 /* FIXME: we want to pin hwif down */
880 return 0;
881 }
882
ata_probe(dev_t dev,int * part,void * data)883 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
884 {
885 ide_hwif_t *hwif = data;
886 int unit = *part >> PARTN_BITS;
887 ide_drive_t *drive = hwif->devices[unit];
888
889 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
890 return NULL;
891
892 if (drive->media == ide_disk)
893 request_module("ide-disk");
894 if (drive->media == ide_cdrom || drive->media == ide_optical)
895 request_module("ide-cd");
896 if (drive->media == ide_tape)
897 request_module("ide-tape");
898 if (drive->media == ide_floppy)
899 request_module("ide-floppy");
900
901 return NULL;
902 }
903
exact_match(dev_t dev,int * part,void * data)904 static struct kobject *exact_match(dev_t dev, int *part, void *data)
905 {
906 struct gendisk *p = data;
907 *part &= (1 << PARTN_BITS) - 1;
908 return &disk_to_dev(p)->kobj;
909 }
910
exact_lock(dev_t dev,void * data)911 static int exact_lock(dev_t dev, void *data)
912 {
913 struct gendisk *p = data;
914
915 if (!get_disk(p))
916 return -1;
917 return 0;
918 }
919
ide_register_region(struct gendisk * disk)920 void ide_register_region(struct gendisk *disk)
921 {
922 blk_register_region(MKDEV(disk->major, disk->first_minor),
923 disk->minors, NULL, exact_match, exact_lock, disk);
924 }
925
926 EXPORT_SYMBOL_GPL(ide_register_region);
927
ide_unregister_region(struct gendisk * disk)928 void ide_unregister_region(struct gendisk *disk)
929 {
930 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
931 disk->minors);
932 }
933
934 EXPORT_SYMBOL_GPL(ide_unregister_region);
935
ide_init_disk(struct gendisk * disk,ide_drive_t * drive)936 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
937 {
938 ide_hwif_t *hwif = drive->hwif;
939 unsigned int unit = drive->dn & 1;
940
941 disk->major = hwif->major;
942 disk->first_minor = unit << PARTN_BITS;
943 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
944 disk->queue = drive->queue;
945 }
946
947 EXPORT_SYMBOL_GPL(ide_init_disk);
948
drive_release_dev(struct device * dev)949 static void drive_release_dev (struct device *dev)
950 {
951 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
952
953 ide_proc_unregister_device(drive);
954
955 blk_cleanup_queue(drive->queue);
956 drive->queue = NULL;
957
958 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
959
960 complete(&drive->gendev_rel_comp);
961 }
962
hwif_init(ide_hwif_t * hwif)963 static int hwif_init(ide_hwif_t *hwif)
964 {
965 if (!hwif->irq) {
966 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
967 return 0;
968 }
969
970 if (register_blkdev(hwif->major, hwif->name))
971 return 0;
972
973 if (!hwif->sg_max_nents)
974 hwif->sg_max_nents = PRD_ENTRIES;
975
976 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
977 GFP_KERNEL);
978 if (!hwif->sg_table) {
979 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
980 goto out;
981 }
982
983 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
984
985 if (init_irq(hwif)) {
986 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
987 hwif->name, hwif->irq);
988 goto out;
989 }
990
991 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
992 THIS_MODULE, ata_probe, ata_lock, hwif);
993 return 1;
994
995 out:
996 unregister_blkdev(hwif->major, hwif->name);
997 return 0;
998 }
999
hwif_register_devices(ide_hwif_t * hwif)1000 static void hwif_register_devices(ide_hwif_t *hwif)
1001 {
1002 ide_drive_t *drive;
1003 unsigned int i;
1004
1005 ide_port_for_each_present_dev(i, drive, hwif) {
1006 struct device *dev = &drive->gendev;
1007 int ret;
1008
1009 dev_set_name(dev, "%u.%u", hwif->index, i);
1010 dev_set_drvdata(dev, drive);
1011 dev->parent = &hwif->gendev;
1012 dev->bus = &ide_bus_type;
1013 dev->release = drive_release_dev;
1014
1015 ret = device_register(dev);
1016 if (ret < 0)
1017 printk(KERN_WARNING "IDE: %s: device_register error: "
1018 "%d\n", __func__, ret);
1019 }
1020 }
1021
ide_port_init_devices(ide_hwif_t * hwif)1022 static void ide_port_init_devices(ide_hwif_t *hwif)
1023 {
1024 const struct ide_port_ops *port_ops = hwif->port_ops;
1025 ide_drive_t *drive;
1026 int i;
1027
1028 ide_port_for_each_dev(i, drive, hwif) {
1029 drive->dn = i + hwif->channel * 2;
1030
1031 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1032 drive->io_32bit = 1;
1033 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1034 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1035 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1036 drive->dev_flags |= IDE_DFLAG_UNMASK;
1037 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1038 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1039
1040 drive->pio_mode = XFER_PIO_0;
1041
1042 if (port_ops && port_ops->init_dev)
1043 port_ops->init_dev(drive);
1044 }
1045 }
1046
ide_init_port(ide_hwif_t * hwif,unsigned int port,const struct ide_port_info * d)1047 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1048 const struct ide_port_info *d)
1049 {
1050 hwif->channel = port;
1051
1052 hwif->chipset = d->chipset ? d->chipset : ide_pci;
1053
1054 if (d->init_iops)
1055 d->init_iops(hwif);
1056
1057 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1058 hwif->host_flags |= d->host_flags;
1059 hwif->pio_mask = d->pio_mask;
1060
1061 if (d->tp_ops)
1062 hwif->tp_ops = d->tp_ops;
1063
1064 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1065 if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1066 hwif->port_ops = d->port_ops;
1067
1068 hwif->swdma_mask = d->swdma_mask;
1069 hwif->mwdma_mask = d->mwdma_mask;
1070 hwif->ultra_mask = d->udma_mask;
1071
1072 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1073 int rc;
1074
1075 hwif->dma_ops = d->dma_ops;
1076
1077 if (d->init_dma)
1078 rc = d->init_dma(hwif, d);
1079 else
1080 rc = ide_hwif_setup_dma(hwif, d);
1081
1082 if (rc < 0) {
1083 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1084
1085 hwif->dma_ops = NULL;
1086 hwif->dma_base = 0;
1087 hwif->swdma_mask = 0;
1088 hwif->mwdma_mask = 0;
1089 hwif->ultra_mask = 0;
1090 }
1091 }
1092
1093 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1094 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1095 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1096
1097 if (d->max_sectors)
1098 hwif->rqsize = d->max_sectors;
1099 else {
1100 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1101 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1102 hwif->rqsize = 256;
1103 else
1104 hwif->rqsize = 65536;
1105 }
1106
1107 /* call chipset specific routine for each enabled port */
1108 if (d->init_hwif)
1109 d->init_hwif(hwif);
1110 }
1111
ide_port_cable_detect(ide_hwif_t * hwif)1112 static void ide_port_cable_detect(ide_hwif_t *hwif)
1113 {
1114 const struct ide_port_ops *port_ops = hwif->port_ops;
1115
1116 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1117 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1118 hwif->cbl = port_ops->cable_detect(hwif);
1119 }
1120 }
1121
1122 static const u8 ide_hwif_to_major[] =
1123 { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1124 IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1125
ide_port_init_devices_data(ide_hwif_t * hwif)1126 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1127 {
1128 ide_drive_t *drive;
1129 int i;
1130
1131 ide_port_for_each_dev(i, drive, hwif) {
1132 u8 j = (hwif->index * MAX_DRIVES) + i;
1133 u16 *saved_id = drive->id;
1134
1135 memset(drive, 0, sizeof(*drive));
1136 memset(saved_id, 0, SECTOR_SIZE);
1137 drive->id = saved_id;
1138
1139 drive->media = ide_disk;
1140 drive->select = (i << 4) | ATA_DEVICE_OBS;
1141 drive->hwif = hwif;
1142 drive->ready_stat = ATA_DRDY;
1143 drive->bad_wstat = BAD_W_STAT;
1144 drive->special_flags = IDE_SFLAG_RECALIBRATE |
1145 IDE_SFLAG_SET_GEOMETRY;
1146 drive->name[0] = 'h';
1147 drive->name[1] = 'd';
1148 drive->name[2] = 'a' + j;
1149 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
1150
1151 INIT_LIST_HEAD(&drive->list);
1152 init_completion(&drive->gendev_rel_comp);
1153 }
1154 }
1155
ide_init_port_data(ide_hwif_t * hwif,unsigned int index)1156 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1157 {
1158 /* fill in any non-zero initial values */
1159 hwif->index = index;
1160 hwif->major = ide_hwif_to_major[index];
1161
1162 hwif->name[0] = 'i';
1163 hwif->name[1] = 'd';
1164 hwif->name[2] = 'e';
1165 hwif->name[3] = '0' + index;
1166
1167 spin_lock_init(&hwif->lock);
1168
1169 init_timer(&hwif->timer);
1170 hwif->timer.function = &ide_timer_expiry;
1171 hwif->timer.data = (unsigned long)hwif;
1172
1173 init_completion(&hwif->gendev_rel_comp);
1174
1175 hwif->tp_ops = &default_tp_ops;
1176
1177 ide_port_init_devices_data(hwif);
1178 }
1179
ide_init_port_hw(ide_hwif_t * hwif,struct ide_hw * hw)1180 static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1181 {
1182 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1183 hwif->irq = hw->irq;
1184 hwif->dev = hw->dev;
1185 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1186 hwif->config_data = hw->config;
1187 }
1188
1189 static unsigned int ide_indexes;
1190
1191 /**
1192 * ide_find_port_slot - find free port slot
1193 * @d: IDE port info
1194 *
1195 * Return the new port slot index or -ENOENT if we are out of free slots.
1196 */
1197
ide_find_port_slot(const struct ide_port_info * d)1198 static int ide_find_port_slot(const struct ide_port_info *d)
1199 {
1200 int idx = -ENOENT;
1201 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1202 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1203
1204 /*
1205 * Claim an unassigned slot.
1206 *
1207 * Give preference to claiming other slots before claiming ide0/ide1,
1208 * just in case there's another interface yet-to-be-scanned
1209 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1210 *
1211 * Unless there is a bootable card that does not use the standard
1212 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1213 */
1214 mutex_lock(&ide_cfg_mtx);
1215 if (bootable) {
1216 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1217 idx = ffz(ide_indexes | i);
1218 } else {
1219 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1220 idx = ffz(ide_indexes | 3);
1221 else if ((ide_indexes & 3) != 3)
1222 idx = ffz(ide_indexes);
1223 }
1224 if (idx >= 0)
1225 ide_indexes |= (1 << idx);
1226 mutex_unlock(&ide_cfg_mtx);
1227
1228 return idx;
1229 }
1230
ide_free_port_slot(int idx)1231 static void ide_free_port_slot(int idx)
1232 {
1233 mutex_lock(&ide_cfg_mtx);
1234 ide_indexes &= ~(1 << idx);
1235 mutex_unlock(&ide_cfg_mtx);
1236 }
1237
ide_port_free_devices(ide_hwif_t * hwif)1238 static void ide_port_free_devices(ide_hwif_t *hwif)
1239 {
1240 ide_drive_t *drive;
1241 int i;
1242
1243 ide_port_for_each_dev(i, drive, hwif) {
1244 kfree(drive->id);
1245 kfree(drive);
1246 }
1247 }
1248
ide_port_alloc_devices(ide_hwif_t * hwif,int node)1249 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1250 {
1251 int i;
1252
1253 for (i = 0; i < MAX_DRIVES; i++) {
1254 ide_drive_t *drive;
1255
1256 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1257 if (drive == NULL)
1258 goto out_nomem;
1259
1260 /*
1261 * In order to keep things simple we have an id
1262 * block for all drives at all times. If the device
1263 * is pre ATA or refuses ATA/ATAPI identify we
1264 * will add faked data to this.
1265 *
1266 * Also note that 0 everywhere means "can't do X"
1267 */
1268 drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1269 if (drive->id == NULL)
1270 goto out_nomem;
1271
1272 hwif->devices[i] = drive;
1273 }
1274 return 0;
1275
1276 out_nomem:
1277 ide_port_free_devices(hwif);
1278 return -ENOMEM;
1279 }
1280
ide_host_alloc(const struct ide_port_info * d,struct ide_hw ** hws,unsigned int n_ports)1281 struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1282 struct ide_hw **hws, unsigned int n_ports)
1283 {
1284 struct ide_host *host;
1285 struct device *dev = hws[0] ? hws[0]->dev : NULL;
1286 int node = dev ? dev_to_node(dev) : -1;
1287 int i;
1288
1289 host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1290 if (host == NULL)
1291 return NULL;
1292
1293 for (i = 0; i < n_ports; i++) {
1294 ide_hwif_t *hwif;
1295 int idx;
1296
1297 if (hws[i] == NULL)
1298 continue;
1299
1300 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1301 if (hwif == NULL)
1302 continue;
1303
1304 if (ide_port_alloc_devices(hwif, node) < 0) {
1305 kfree(hwif);
1306 continue;
1307 }
1308
1309 idx = ide_find_port_slot(d);
1310 if (idx < 0) {
1311 printk(KERN_ERR "%s: no free slot for interface\n",
1312 d ? d->name : "ide");
1313 ide_port_free_devices(hwif);
1314 kfree(hwif);
1315 continue;
1316 }
1317
1318 ide_init_port_data(hwif, idx);
1319
1320 hwif->host = host;
1321
1322 host->ports[i] = hwif;
1323 host->n_ports++;
1324 }
1325
1326 if (host->n_ports == 0) {
1327 kfree(host);
1328 return NULL;
1329 }
1330
1331 host->dev[0] = dev;
1332
1333 if (d) {
1334 host->init_chipset = d->init_chipset;
1335 host->get_lock = d->get_lock;
1336 host->release_lock = d->release_lock;
1337 host->host_flags = d->host_flags;
1338 host->irq_flags = d->irq_flags;
1339 }
1340
1341 return host;
1342 }
1343 EXPORT_SYMBOL_GPL(ide_host_alloc);
1344
ide_port_free(ide_hwif_t * hwif)1345 static void ide_port_free(ide_hwif_t *hwif)
1346 {
1347 ide_port_free_devices(hwif);
1348 ide_free_port_slot(hwif->index);
1349 kfree(hwif);
1350 }
1351
ide_disable_port(ide_hwif_t * hwif)1352 static void ide_disable_port(ide_hwif_t *hwif)
1353 {
1354 struct ide_host *host = hwif->host;
1355 int i;
1356
1357 printk(KERN_INFO "%s: disabling port\n", hwif->name);
1358
1359 for (i = 0; i < MAX_HOST_PORTS; i++) {
1360 if (host->ports[i] == hwif) {
1361 host->ports[i] = NULL;
1362 host->n_ports--;
1363 }
1364 }
1365
1366 ide_port_free(hwif);
1367 }
1368
ide_host_register(struct ide_host * host,const struct ide_port_info * d,struct ide_hw ** hws)1369 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1370 struct ide_hw **hws)
1371 {
1372 ide_hwif_t *hwif, *mate = NULL;
1373 int i, j = 0;
1374
1375 ide_host_for_each_port(i, hwif, host) {
1376 if (hwif == NULL) {
1377 mate = NULL;
1378 continue;
1379 }
1380
1381 ide_init_port_hw(hwif, hws[i]);
1382 ide_port_apply_params(hwif);
1383
1384 if ((i & 1) && mate) {
1385 hwif->mate = mate;
1386 mate->mate = hwif;
1387 }
1388
1389 mate = (i & 1) ? NULL : hwif;
1390
1391 ide_init_port(hwif, i & 1, d);
1392 ide_port_cable_detect(hwif);
1393
1394 hwif->port_flags |= IDE_PFLAG_PROBING;
1395
1396 ide_port_init_devices(hwif);
1397 }
1398
1399 ide_host_for_each_port(i, hwif, host) {
1400 if (hwif == NULL)
1401 continue;
1402
1403 if (ide_probe_port(hwif) == 0)
1404 hwif->present = 1;
1405
1406 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1407
1408 if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1409 hwif->mate == NULL || hwif->mate->present == 0) {
1410 if (ide_register_port(hwif)) {
1411 ide_disable_port(hwif);
1412 continue;
1413 }
1414 }
1415
1416 if (hwif->present)
1417 ide_port_tune_devices(hwif);
1418 }
1419
1420 ide_host_enable_irqs(host);
1421
1422 ide_host_for_each_port(i, hwif, host) {
1423 if (hwif == NULL)
1424 continue;
1425
1426 if (hwif_init(hwif) == 0) {
1427 printk(KERN_INFO "%s: failed to initialize IDE "
1428 "interface\n", hwif->name);
1429 device_unregister(&hwif->gendev);
1430 ide_disable_port(hwif);
1431 continue;
1432 }
1433
1434 if (hwif->present)
1435 if (ide_port_setup_devices(hwif) == 0) {
1436 hwif->present = 0;
1437 continue;
1438 }
1439
1440 j++;
1441
1442 ide_acpi_init_port(hwif);
1443
1444 if (hwif->present)
1445 ide_acpi_port_init_devices(hwif);
1446 }
1447
1448 ide_host_for_each_port(i, hwif, host) {
1449 if (hwif == NULL)
1450 continue;
1451
1452 ide_sysfs_register_port(hwif);
1453 ide_proc_register_port(hwif);
1454
1455 if (hwif->present) {
1456 ide_proc_port_register_devices(hwif);
1457 hwif_register_devices(hwif);
1458 }
1459 }
1460
1461 return j ? 0 : -1;
1462 }
1463 EXPORT_SYMBOL_GPL(ide_host_register);
1464
ide_host_add(const struct ide_port_info * d,struct ide_hw ** hws,unsigned int n_ports,struct ide_host ** hostp)1465 int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1466 unsigned int n_ports, struct ide_host **hostp)
1467 {
1468 struct ide_host *host;
1469 int rc;
1470
1471 host = ide_host_alloc(d, hws, n_ports);
1472 if (host == NULL)
1473 return -ENOMEM;
1474
1475 rc = ide_host_register(host, d, hws);
1476 if (rc) {
1477 ide_host_free(host);
1478 return rc;
1479 }
1480
1481 if (hostp)
1482 *hostp = host;
1483
1484 return 0;
1485 }
1486 EXPORT_SYMBOL_GPL(ide_host_add);
1487
__ide_port_unregister_devices(ide_hwif_t * hwif)1488 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1489 {
1490 ide_drive_t *drive;
1491 int i;
1492
1493 ide_port_for_each_present_dev(i, drive, hwif) {
1494 device_unregister(&drive->gendev);
1495 wait_for_completion(&drive->gendev_rel_comp);
1496 }
1497 }
1498
ide_port_unregister_devices(ide_hwif_t * hwif)1499 void ide_port_unregister_devices(ide_hwif_t *hwif)
1500 {
1501 mutex_lock(&ide_cfg_mtx);
1502 __ide_port_unregister_devices(hwif);
1503 hwif->present = 0;
1504 ide_port_init_devices_data(hwif);
1505 mutex_unlock(&ide_cfg_mtx);
1506 }
1507 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1508
1509 /**
1510 * ide_unregister - free an IDE interface
1511 * @hwif: IDE interface
1512 *
1513 * Perform the final unregister of an IDE interface.
1514 *
1515 * Locking:
1516 * The caller must not hold the IDE locks.
1517 *
1518 * It is up to the caller to be sure there is no pending I/O here,
1519 * and that the interface will not be reopened (present/vanishing
1520 * locking isn't yet done BTW).
1521 */
1522
ide_unregister(ide_hwif_t * hwif)1523 static void ide_unregister(ide_hwif_t *hwif)
1524 {
1525 BUG_ON(in_interrupt());
1526 BUG_ON(irqs_disabled());
1527
1528 mutex_lock(&ide_cfg_mtx);
1529
1530 if (hwif->present) {
1531 __ide_port_unregister_devices(hwif);
1532 hwif->present = 0;
1533 }
1534
1535 ide_proc_unregister_port(hwif);
1536
1537 if (!hwif->host->get_lock)
1538 free_irq(hwif->irq, hwif);
1539
1540 device_unregister(hwif->portdev);
1541 device_unregister(&hwif->gendev);
1542 wait_for_completion(&hwif->gendev_rel_comp);
1543
1544 /*
1545 * Remove us from the kernel's knowledge
1546 */
1547 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1548 kfree(hwif->sg_table);
1549 unregister_blkdev(hwif->major, hwif->name);
1550
1551 ide_release_dma_engine(hwif);
1552
1553 mutex_unlock(&ide_cfg_mtx);
1554 }
1555
ide_host_free(struct ide_host * host)1556 void ide_host_free(struct ide_host *host)
1557 {
1558 ide_hwif_t *hwif;
1559 int i;
1560
1561 ide_host_for_each_port(i, hwif, host) {
1562 if (hwif)
1563 ide_port_free(hwif);
1564 }
1565
1566 kfree(host);
1567 }
1568 EXPORT_SYMBOL_GPL(ide_host_free);
1569
ide_host_remove(struct ide_host * host)1570 void ide_host_remove(struct ide_host *host)
1571 {
1572 ide_hwif_t *hwif;
1573 int i;
1574
1575 ide_host_for_each_port(i, hwif, host) {
1576 if (hwif)
1577 ide_unregister(hwif);
1578 }
1579
1580 ide_host_free(host);
1581 }
1582 EXPORT_SYMBOL_GPL(ide_host_remove);
1583
ide_port_scan(ide_hwif_t * hwif)1584 void ide_port_scan(ide_hwif_t *hwif)
1585 {
1586 int rc;
1587
1588 ide_port_apply_params(hwif);
1589 ide_port_cable_detect(hwif);
1590
1591 hwif->port_flags |= IDE_PFLAG_PROBING;
1592
1593 ide_port_init_devices(hwif);
1594
1595 rc = ide_probe_port(hwif);
1596
1597 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1598
1599 if (rc < 0)
1600 return;
1601
1602 hwif->present = 1;
1603
1604 ide_port_tune_devices(hwif);
1605 ide_port_setup_devices(hwif);
1606 ide_acpi_port_init_devices(hwif);
1607 hwif_register_devices(hwif);
1608 ide_proc_port_register_devices(hwif);
1609 }
1610 EXPORT_SYMBOL_GPL(ide_port_scan);
1611