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 <linux/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_flags |= IDE_SFLAG_SET_MULTMODE;
 101         }
 102 }
 103
 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
 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                 /* fall through */
 146         case ide_cdrom:
 147                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 148 #ifdef CONFIG_PPC
 149                 /* kludge for Apple PowerBook internal zip */
 150                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 151                         printk(KERN_CONT "FLOPPY");
 152                         type = ide_floppy;
 153                         break;
 154                 }
 155 #endif
 156                 printk(KERN_CONT "CD/DVD-ROM");
 157                 break;
 158         case ide_tape:
 159                 printk(KERN_CONT "TAPE");
 160                 break;
 161         case ide_optical:
 162                 printk(KERN_CONT "OPTICAL");
 163                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 164                 break;
 165         default:
 166                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 167                 break;
 168         }
 169
 170         printk(KERN_CONT " drive\n");
 171         drive->media = type;
 172         /* an ATAPI device ignores DRDY */
 173         drive->ready_stat = 0;
 174         if (ata_id_cdb_intr(id))
 175                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 176         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 177         /* we don't do head unloading on ATAPI devices */
 178         drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 179 }
 180
 181 /**
 182  *      do_identify     -       identify a drive
 183  *      @drive: drive to identify
 184  *      @cmd: command used
 185  *      @id: buffer for IDENTIFY data
 186  *
 187  *      Called when we have issued a drive identify command to
 188  *      read and parse the results. This function is run with
 189  *      interrupts disabled.
 190  */
 191
 192 static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
 193 {
 194         ide_hwif_t *hwif = drive->hwif;
 195         char *m = (char *)&id[ATA_ID_PROD];
 196         unsigned long flags;
 197         int bswap = 1;
 198
 199         /* local CPU only; some systems need this */
 200         local_irq_save(flags);
 201         /* read 512 bytes of id info */
 202         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 203         local_irq_restore(flags);
 204
 205         drive->dev_flags |= IDE_DFLAG_ID_READ;
 206 #ifdef DEBUG
 207         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 208         ide_dump_identify((u8 *)id);
 209 #endif
 210         ide_fix_driveid(id);
 211
 212         /*
 213          *  ATA_CMD_ID_ATA returns little-endian info,
 214          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 215          */
 216         if (cmd == ATA_CMD_ID_ATAPI) {
 217                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 218                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 219                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 220                         /* Vertos drives may still be weird */
 221                         bswap ^= 1;
 222         }
 223
 224         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 225         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 226         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 227
 228         /* we depend on this a lot! */
 229         m[ATA_ID_PROD_LEN - 1] = '\0';
 230
 231         if (strstr(m, "E X A B Y T E N E S T"))
 232                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 233         else
 234                 drive->dev_flags |= IDE_DFLAG_PRESENT;
 235 }
 236
 237 /**
 238  *      ide_dev_read_id -       send ATA/ATAPI IDENTIFY command
 239  *      @drive: drive to identify
 240  *      @cmd: command to use
 241  *      @id: buffer for IDENTIFY data
 242  *      @irq_ctx: flag set when called from the IRQ context
 243  *
 244  *      Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
 245  *
 246  *      Returns:        0  device was identified
 247  *                      1  device timed-out (no response to identify request)
 248  *                      2  device aborted the command (refused to identify itself)
 249  */
 250
 251 int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
 252 {
 253         ide_hwif_t *hwif = drive->hwif;
 254         struct ide_io_ports *io_ports = &hwif->io_ports;
 255         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 256         int use_altstatus = 0, rc;
 257         unsigned long timeout;
 258         u8 s = 0, a = 0;
 259
 260         /*
 261          * Disable device IRQ.  Otherwise we'll get spurious interrupts
 262          * during the identify phase that the IRQ handler isn't expecting.
 263          */
 264         if (io_ports->ctl_addr)
 265                 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 266
 267         /* take a deep breath */
 268         if (irq_ctx)
 269                 mdelay(50);
 270         else
 271                 msleep(50);
 272
 273         if (io_ports->ctl_addr &&
 274             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 275                 a = tp_ops->read_altstatus(hwif);
 276                 s = tp_ops->read_status(hwif);
 277                 if ((a ^ s) & ~ATA_SENSE)
 278                         /* ancient Seagate drives, broken interfaces */
 279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 280                                          "instead of ALTSTATUS(0x%02x)\n",
 281                                          drive->name, s, a);
 282                 else
 283                         /* use non-intrusive polling */
 284                         use_altstatus = 1;
 285         }
 286
 287         /* set features register for atapi
 288          * identify command to be sure of reply
 289          */
 290         if (cmd == ATA_CMD_ID_ATAPI) {
 291                 struct ide_taskfile tf;
 292
 293                 memset(&tf, 0, sizeof(tf));
 294                 /* disable DMA & overlap */
 295                 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
 296         }
 297
 298         /* ask drive for ID */
 299         tp_ops->exec_command(hwif, cmd);
 300
 301         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 302
 303         /* wait for IRQ and ATA_DRQ */
 304         if (irq_ctx) {
 305                 rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
 306                 if (rc)
 307                         return 1;
 308         } else {
 309                 rc = ide_busy_sleep(drive, timeout, use_altstatus);
 310                 if (rc)
 311                         return 1;
 312
 313                 msleep(50);
 314                 s = tp_ops->read_status(hwif);
 315         }
 316
 317         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 318                 /* drive returned ID */
 319                 do_identify(drive, cmd, id);
 320                 /* drive responded with ID */
 321                 rc = 0;
 322                 /* clear drive IRQ */
 323                 (void)tp_ops->read_status(hwif);
 324         } else {
 325                 /* drive refused ID */
 326                 rc = 2;
 327         }
 328         return rc;
 329 }
 330
 331 int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
 332 {
 333         ide_hwif_t *hwif = drive->hwif;
 334         u8 stat;
 335
 336         timeout += jiffies;
 337
 338         do {
 339                 msleep(50);     /* give drive a breather */
 340                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 341                                  : hwif->tp_ops->read_status(hwif);
 342                 if ((stat & ATA_BUSY) == 0)
 343                         return 0;
 344         } while (time_before(jiffies, timeout));
 345
 346         printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
 347
 348         return 1;       /* drive timed-out */
 349 }
 350
 351 static u8 ide_read_device(ide_drive_t *drive)
 352 {
 353         struct ide_taskfile tf;
 354
 355         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
 356
 357         return tf.device;
 358 }
 359
 360 /**
 361  *      do_probe                -       probe an IDE device
 362  *      @drive: drive to probe
 363  *      @cmd: command to use
 364  *
 365  *      do_probe() has the difficult job of finding a drive if it exists,
 366  *      without getting hung up if it doesn't exist, without trampling on
 367  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 368  *
 369  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 370  *      but does not respond right away, the probe will "hang in there"
 371  *      for the maximum wait time (about 30 seconds), otherwise it will
 372  *      exit much more quickly.
 373  *
 374  * Returns:     0  device was identified
 375  *              1  device timed-out (no response to identify request)
 376  *              2  device aborted the command (refused to identify itself)
 377  *              3  bad status from device (possible for ATAPI drives)
 378  *              4  probe was not attempted because failure was obvious
 379  */
 380
 381 static int do_probe (ide_drive_t *drive, u8 cmd)
 382 {
 383         ide_hwif_t *hwif = drive->hwif;
 384         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 385         u16 *id = drive->id;
 386         int rc;
 387         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 388
 389         /* avoid waiting for inappropriate probes */
 390         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 391                 return 4;
 392
 393 #ifdef DEBUG
 394         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 395                 drive->name, present, drive->media,
 396                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 397 #endif
 398
 399         /* needed for some systems
 400          * (e.g. crw9624 as drive0 with disk as slave)
 401          */
 402         msleep(50);
 403         tp_ops->dev_select(drive);
 404         msleep(50);
 405
 406         if (ide_read_device(drive) != drive->select && present == 0) {
 407                 if (drive->dn & 1) {
 408                         /* exit with drive0 selected */
 409                         tp_ops->dev_select(hwif->devices[0]);
 410                         /* allow ATA_BUSY to assert & clear */
 411                         msleep(50);
 412                 }
 413                 /* no i/f present: mmm.. this should be a 4 -ml */
 414                 return 3;
 415         }
 416
 417         stat = tp_ops->read_status(hwif);
 418
 419         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 420             present || cmd == ATA_CMD_ID_ATAPI) {
 421                 rc = ide_dev_read_id(drive, cmd, id, 0);
 422                 if (rc)
 423                         /* failed: try again */
 424                         rc = ide_dev_read_id(drive, cmd, id, 0);
 425
 426                 stat = tp_ops->read_status(hwif);
 427
 428                 if (stat == (ATA_BUSY | ATA_DRDY))
 429                         return 4;
 430
 431                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 432                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 433                                         "resetting drive\n", drive->name, stat);
 434                         msleep(50);
 435                         tp_ops->dev_select(drive);
 436                         msleep(50);
 437                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 438                         (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
 439                         rc = ide_dev_read_id(drive, cmd, id, 0);
 440                 }
 441
 442                 /* ensure drive IRQ is clear */
 443                 stat = tp_ops->read_status(hwif);
 444
 445                 if (rc == 1)
 446                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 447                                         drive->name, stat);
 448         } else {
 449                 /* not present or maybe ATAPI */
 450                 rc = 3;
 451         }
 452         if (drive->dn & 1) {
 453                 /* exit with drive0 selected */
 454                 tp_ops->dev_select(hwif->devices[0]);
 455                 msleep(50);
 456                 /* ensure drive irq is clear */
 457                 (void)tp_ops->read_status(hwif);
 458         }
 459         return rc;
 460 }
 461
 462 /**
 463  *      probe_for_drives        -       upper level drive probe
 464  *      @drive: drive to probe for
 465  *
 466  *      probe_for_drive() tests for existence of a given drive using do_probe()
 467  *      and presents things to the user as needed.
 468  *
 469  *      Returns:        0  no device was found
 470  *                      1  device was found
 471  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 472  */
 473
 474 static u8 probe_for_drive(ide_drive_t *drive)
 475 {
 476         char *m;
 477         int rc;
 478         u8 cmd;
 479
 480         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 481
 482         m = (char *)&drive->id[ATA_ID_PROD];
 483         strcpy(m, "UNKNOWN");
 484
 485         /* skip probing? */
 486         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 487                 /* if !(success||timed-out) */
 488                 cmd = ATA_CMD_ID_ATA;
 489                 rc = do_probe(drive, cmd);
 490                 if (rc >= 2) {
 491                         /* look for ATAPI device */
 492                         cmd = ATA_CMD_ID_ATAPI;
 493                         rc = do_probe(drive, cmd);
 494                 }
 495
 496                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 497                         return 0;
 498
 499                 /* identification failed? */
 500                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 501                         if (drive->media == ide_disk) {
 502                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 503                                         drive->name, drive->cyl,
 504                                         drive->head, drive->sect);
 505                         } else if (drive->media == ide_cdrom) {
 506                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 507                         } else {
 508                                 /* nuke it */
 509                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 510                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 511                         }
 512                 } else {
 513                         if (cmd == ATA_CMD_ID_ATAPI)
 514                                 ide_classify_atapi_dev(drive);
 515                         else
 516                                 ide_classify_ata_dev(drive);
 517                 }
 518         }
 519
 520         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 521                 return 0;
 522
 523         /* The drive wasn't being helpful. Add generic info only */
 524         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 525                 generic_id(drive);
 526                 return 1;
 527         }
 528
 529         if (drive->media == ide_disk) {
 530                 ide_disk_init_chs(drive);
 531                 ide_disk_init_mult_count(drive);
 532         }
 533
 534         return 1;
 535 }
 536
 537 static void hwif_release_dev(struct device *dev)
 538 {
 539         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 540
 541         complete(&hwif->gendev_rel_comp);
 542 }
 543
 544 static int ide_register_port(ide_hwif_t *hwif)
 545 {
 546         int ret;
 547
 548         /* register with global device tree */
 549         dev_set_name(&hwif->gendev, "%s", hwif->name);
 550         dev_set_drvdata(&hwif->gendev, hwif);
 551         if (hwif->gendev.parent == NULL)
 552                 hwif->gendev.parent = hwif->dev;
 553         hwif->gendev.release = hwif_release_dev;
 554
 555         ret = device_register(&hwif->gendev);
 556         if (ret < 0) {
 557                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 558                         __func__, ret);
 559                 goto out;
 560         }
 561
 562         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 563                                       MKDEV(0, 0), hwif, "%s", hwif->name);
 564         if (IS_ERR(hwif->portdev)) {
 565                 ret = PTR_ERR(hwif->portdev);
 566                 device_unregister(&hwif->gendev);
 567         }
 568 out:
 569         return ret;
 570 }
 571
 572 /**
 573  *      ide_port_wait_ready     -       wait for port to become ready
 574  *      @hwif: IDE port
 575  *
 576  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 577  *      platforms.  Typical cases are:
 578  *
 579  *      - The firmware hard reset the disk before booting the kernel,
 580  *        the drive is still doing it's poweron-reset sequence, that
 581  *        can take up to 30 seconds.
 582  *
 583  *      - The firmware does nothing (or no firmware), the device is
 584  *        still in POST state (same as above actually).
 585  *
 586  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 587  *        their reset sequence even when they are non-selected slave
 588  *        devices, thus preventing discovery of the main HD.
 589  *
 590  *      Doing this wait-for-non-busy should not harm any existing
 591  *      configuration and fix some issues like the above.
 592  *
 593  *      BenH.
 594  *
 595  *      Returns 0 on success, error code (< 0) otherwise.
 596  */
 597
 598 static int ide_port_wait_ready(ide_hwif_t *hwif)
 599 {
 600         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 601         ide_drive_t *drive;
 602         int i, rc;
 603
 604         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 605
 606         /* Let HW settle down a bit from whatever init state we
 607          * come from */
 608         mdelay(2);
 609
 610         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 611          * I know of at least one disk who takes 31 seconds, I use 35
 612          * here to be safe
 613          */
 614         rc = ide_wait_not_busy(hwif, 35000);
 615         if (rc)
 616                 return rc;
 617
 618         /* Now make sure both master & slave are ready */
 619         ide_port_for_each_dev(i, drive, hwif) {
 620                 /* Ignore disks that we will not probe for later. */
 621                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 622                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 623                         tp_ops->dev_select(drive);
 624                         tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 625                         mdelay(2);
 626                         rc = ide_wait_not_busy(hwif, 35000);
 627                         if (rc)
 628                                 goto out;
 629                 } else
 630                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 631                                           drive->name);
 632         }
 633 out:
 634         /* Exit function with master reselected (let's be sane) */
 635         if (i)
 636                 tp_ops->dev_select(hwif->devices[0]);
 637
 638         return rc;
 639 }
 640
 641 /**
 642  *      ide_undecoded_slave     -       look for bad CF adapters
 643  *      @dev1: slave device
 644  *
 645  *      Analyse the drives on the interface and attempt to decide if we
 646  *      have the same drive viewed twice. This occurs with crap CF adapters
 647  *      and PCMCIA sometimes.
 648  */
 649
 650 void ide_undecoded_slave(ide_drive_t *dev1)
 651 {
 652         ide_drive_t *dev0 = dev1->hwif->devices[0];
 653
 654         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 655                 return;
 656
 657         /* If the models don't match they are not the same product */
 658         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 659                    (char *)&dev1->id[ATA_ID_PROD]))
 660                 return;
 661
 662         /* Serial numbers do not match */
 663         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 664                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 665                 return;
 666
 667         /* No serial number, thankfully very rare for CF */
 668         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 669                 return;
 670
 671         /* Appears to be an IDE flash adapter with decode bugs */
 672         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 673
 674         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 675 }
 676
 677 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 678
 679 static int ide_probe_port(ide_hwif_t *hwif)
 680 {
 681         ide_drive_t *drive;
 682         unsigned int irqd;
 683         int i, rc = -ENODEV;
 684
 685         BUG_ON(hwif->present);
 686
 687         if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
 688             (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 689                 return -EACCES;
 690
 691         /*
 692          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 693          * we'll install our IRQ driver much later...
 694          */
 695         irqd = hwif->irq;
 696         if (irqd)
 697                 disable_irq(hwif->irq);
 698
 699         if (ide_port_wait_ready(hwif) == -EBUSY)
 700                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 701
 702         /*
 703          * Second drive should only exist if first drive was found,
 704          * but a lot of cdrom drives are configured as single slaves.
 705          */
 706         ide_port_for_each_dev(i, drive, hwif) {
 707                 (void) probe_for_drive(drive);
 708                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 709                         rc = 0;
 710         }
 711
 712         /*
 713          * Use cached IRQ number. It might be (and is...) changed by probe
 714          * code above
 715          */
 716         if (irqd)
 717                 enable_irq(irqd);
 718
 719         return rc;
 720 }
 721
 722 static void ide_port_tune_devices(ide_hwif_t *hwif)
 723 {
 724         const struct ide_port_ops *port_ops = hwif->port_ops;
 725         ide_drive_t *drive;
 726         int i;
 727
 728         ide_port_for_each_present_dev(i, drive, hwif) {
 729                 ide_check_nien_quirk_list(drive);
 730
 731                 if (port_ops && port_ops->quirkproc)
 732                         port_ops->quirkproc(drive);
 733         }
 734
 735         ide_port_for_each_present_dev(i, drive, hwif) {
 736                 ide_set_max_pio(drive);
 737
 738                 drive->dev_flags |= IDE_DFLAG_NICE1;
 739
 740                 if (hwif->dma_ops)
 741                         ide_set_dma(drive);
 742         }
 743 }
 744
 745 static void ide_initialize_rq(struct request *rq)
 746 {
 747         struct ide_request *req = blk_mq_rq_to_pdu(rq);
 748
 749         req->special = NULL;
 750         scsi_req_init(&req->sreq);
 751         req->sreq.sense = req->sense;
 752 }
 753
 754 static const struct blk_mq_ops ide_mq_ops = {
 755         .queue_rq               = ide_queue_rq,
 756         .initialize_rq_fn       = ide_initialize_rq,
 757 };
 758
 759 /*
 760  * init request queue
 761  */
 762 static int ide_init_queue(ide_drive_t *drive)
 763 {
 764         struct request_queue *q;
 765         ide_hwif_t *hwif = drive->hwif;
 766         int max_sectors = 256;
 767         int max_sg_entries = PRD_ENTRIES;
 768         struct blk_mq_tag_set *set;
 769
 770         /*
 771          *      Our default set up assumes the normal IDE case,
 772          *      that is 64K segmenting, standard PRD setup
 773          *      and LBA28. Some drivers then impose their own
 774          *      limits and LBA48 we could raise it but as yet
 775          *      do not.
 776          */
 777
 778         set = &drive->tag_set;
 779         set->ops = &ide_mq_ops;
 780         set->nr_hw_queues = 1;
 781         set->queue_depth = 32;
 782         set->reserved_tags = 1;
 783         set->cmd_size = sizeof(struct ide_request);
 784         set->numa_node = hwif_to_node(hwif);
 785         set->flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
 786         if (blk_mq_alloc_tag_set(set))
 787                 return 1;
 788
 789         q = blk_mq_init_queue(set);
 790         if (IS_ERR(q)) {
 791                 blk_mq_free_tag_set(set);
 792                 return 1;
 793         }
 794
 795         blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
 796
 797         q->queuedata = drive;
 798         blk_queue_segment_boundary(q, 0xffff);
 799
 800         if (hwif->rqsize < max_sectors)
 801                 max_sectors = hwif->rqsize;
 802         blk_queue_max_hw_sectors(q, max_sectors);
 803
 804 #ifdef CONFIG_PCI
 805         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 806          * creates segments that don't completely match our boundary
 807          * requirements and thus need to be broken up again. Because it
 808          * doesn't align properly either, we may actually have to break up
 809          * to more segments than what was we got in the first place, a max
 810          * worst case is twice as many.
 811          * This will be fixed once we teach pci_map_sg() about our boundary
 812          * requirements, hopefully soon. *FIXME*
 813          */
 814         max_sg_entries >>= 1;
 815 #endif /* CONFIG_PCI */
 816
 817         blk_queue_max_segments(q, max_sg_entries);
 818
 819         /* assign drive queue */
 820         drive->queue = q;
 821
 822         return 0;
 823 }
 824
 825 static DEFINE_MUTEX(ide_cfg_mtx);
 826
 827 /*
 828  * For any present drive:
 829  * - allocate the block device queue
 830  */
 831 static int ide_port_setup_devices(ide_hwif_t *hwif)
 832 {
 833         ide_drive_t *drive;
 834         int i, j = 0;
 835
 836         mutex_lock(&ide_cfg_mtx);
 837         ide_port_for_each_present_dev(i, drive, hwif) {
 838                 if (ide_init_queue(drive)) {
 839                         printk(KERN_ERR "ide: failed to init %s\n",
 840                                         drive->name);
 841                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 842                         continue;
 843                 }
 844
 845                 j++;
 846         }
 847         mutex_unlock(&ide_cfg_mtx);
 848
 849         return j;
 850 }
 851
 852 static void ide_host_enable_irqs(struct ide_host *host)
 853 {
 854         ide_hwif_t *hwif;
 855         int i;
 856
 857         ide_host_for_each_port(i, hwif, host) {
 858                 if (hwif == NULL)
 859                         continue;
 860
 861                 /* clear any pending IRQs */
 862                 hwif->tp_ops->read_status(hwif);
 863
 864                 /* unmask IRQs */
 865                 if (hwif->io_ports.ctl_addr)
 866                         hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 867         }
 868 }
 869
 870 /*
 871  * This routine sets up the IRQ for an IDE interface.
 872  */
 873 static int init_irq (ide_hwif_t *hwif)
 874 {
 875         struct ide_io_ports *io_ports = &hwif->io_ports;
 876         struct ide_host *host = hwif->host;
 877         irq_handler_t irq_handler = host->irq_handler;
 878         int sa = host->irq_flags;
 879
 880         if (irq_handler == NULL)
 881                 irq_handler = ide_intr;
 882
 883         if (!host->get_lock)
 884                 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
 885                         goto out_up;
 886
 887 #if !defined(__mc68000__)
 888         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 889                 io_ports->data_addr, io_ports->status_addr,
 890                 io_ports->ctl_addr, hwif->irq);
 891 #else
 892         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 893                 io_ports->data_addr, hwif->irq);
 894 #endif /* __mc68000__ */
 895         if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 896                 printk(KERN_CONT " (serialized)");
 897         printk(KERN_CONT "\n");
 898
 899         return 0;
 900 out_up:
 901         return 1;
 902 }
 903
 904 static int ata_lock(dev_t dev, void *data)
 905 {
 906         /* FIXME: we want to pin hwif down */
 907         return 0;
 908 }
 909
 910 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
 911 {
 912         ide_hwif_t *hwif = data;
 913         int unit = *part >> PARTN_BITS;
 914         ide_drive_t *drive = hwif->devices[unit];
 915
 916         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 917                 return NULL;
 918
 919         if (drive->media == ide_disk)
 920                 request_module("ide-disk");
 921         if (drive->media == ide_cdrom || drive->media == ide_optical)
 922                 request_module("ide-cd");
 923         if (drive->media == ide_tape)
 924                 request_module("ide-tape");
 925         if (drive->media == ide_floppy)
 926                 request_module("ide-floppy");
 927
 928         return NULL;
 929 }
 930
 931 static struct kobject *exact_match(dev_t dev, int *part, void *data)
 932 {
 933         struct gendisk *p = data;
 934         *part &= (1 << PARTN_BITS) - 1;
 935         return &disk_to_dev(p)->kobj;
 936 }
 937
 938 static int exact_lock(dev_t dev, void *data)
 939 {
 940         struct gendisk *p = data;
 941
 942         if (!get_disk_and_module(p))
 943                 return -1;
 944         return 0;
 945 }
 946
 947 void ide_register_region(struct gendisk *disk)
 948 {
 949         blk_register_region(MKDEV(disk->major, disk->first_minor),
 950                             disk->minors, NULL, exact_match, exact_lock, disk);
 951 }
 952
 953 EXPORT_SYMBOL_GPL(ide_register_region);
 954
 955 void ide_unregister_region(struct gendisk *disk)
 956 {
 957         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
 958                               disk->minors);
 959 }
 960
 961 EXPORT_SYMBOL_GPL(ide_unregister_region);
 962
 963 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
 964 {
 965         ide_hwif_t *hwif = drive->hwif;
 966         unsigned int unit = drive->dn & 1;
 967
 968         disk->major = hwif->major;
 969         disk->first_minor = unit << PARTN_BITS;
 970         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
 971         disk->queue = drive->queue;
 972 }
 973
 974 EXPORT_SYMBOL_GPL(ide_init_disk);
 975
 976 static void drive_release_dev (struct device *dev)
 977 {
 978         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
 979
 980         ide_proc_unregister_device(drive);
 981
 982         if (drive->sense_rq)
 983                 blk_mq_free_request(drive->sense_rq);
 984
 985         blk_cleanup_queue(drive->queue);
 986         drive->queue = NULL;
 987         blk_mq_free_tag_set(&drive->tag_set);
 988
 989         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 990
 991         complete(&drive->gendev_rel_comp);
 992 }
 993
 994 static int hwif_init(ide_hwif_t *hwif)
 995 {
 996         if (!hwif->irq) {
 997                 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
 998                 return 0;
 999         }
1000
1001         if (register_blkdev(hwif->major, hwif->name))
1002                 return 0;
1003
1004         if (!hwif->sg_max_nents)
1005                 hwif->sg_max_nents = PRD_ENTRIES;
1006
1007         hwif->sg_table = kmalloc_array(hwif->sg_max_nents,
1008                                        sizeof(struct scatterlist),
1009                                        GFP_KERNEL);
1010         if (!hwif->sg_table) {
1011                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1012                 goto out;
1013         }
1014
1015         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1016
1017         if (init_irq(hwif)) {
1018                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1019                         hwif->name, hwif->irq);
1020                 goto out;
1021         }
1022
1023         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1024                             THIS_MODULE, ata_probe, ata_lock, hwif);
1025         return 1;
1026
1027 out:
1028         unregister_blkdev(hwif->major, hwif->name);
1029         return 0;
1030 }
1031
1032 static void hwif_register_devices(ide_hwif_t *hwif)
1033 {
1034         ide_drive_t *drive;
1035         unsigned int i;
1036
1037         ide_port_for_each_present_dev(i, drive, hwif) {
1038                 struct device *dev = &drive->gendev;
1039                 int ret;
1040
1041                 dev_set_name(dev, "%u.%u", hwif->index, i);
1042                 dev_set_drvdata(dev, drive);
1043                 dev->parent = &hwif->gendev;
1044                 dev->bus = &ide_bus_type;
1045                 dev->release = drive_release_dev;
1046
1047                 ret = device_register(dev);
1048                 if (ret < 0)
1049                         printk(KERN_WARNING "IDE: %s: device_register error: "
1050                                             "%d\n", __func__, ret);
1051         }
1052 }
1053
1054 static void ide_port_init_devices(ide_hwif_t *hwif)
1055 {
1056         const struct ide_port_ops *port_ops = hwif->port_ops;
1057         ide_drive_t *drive;
1058         int i;
1059
1060         ide_port_for_each_dev(i, drive, hwif) {
1061                 drive->dn = i + hwif->channel * 2;
1062
1063                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1064                         drive->io_32bit = 1;
1065                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1066                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1067                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1068                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1069                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1070                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1071
1072                 drive->pio_mode = XFER_PIO_0;
1073
1074                 if (port_ops && port_ops->init_dev)
1075                         port_ops->init_dev(drive);
1076         }
1077 }
1078
1079 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1080                           const struct ide_port_info *d)
1081 {
1082         hwif->channel = port;
1083
1084         hwif->chipset = d->chipset ? d->chipset : ide_pci;
1085
1086         if (d->init_iops)
1087                 d->init_iops(hwif);
1088
1089         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1090         hwif->host_flags |= d->host_flags;
1091         hwif->pio_mask = d->pio_mask;
1092
1093         if (d->tp_ops)
1094                 hwif->tp_ops = d->tp_ops;
1095
1096         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1097         if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1098                 hwif->port_ops = d->port_ops;
1099
1100         hwif->swdma_mask = d->swdma_mask;
1101         hwif->mwdma_mask = d->mwdma_mask;
1102         hwif->ultra_mask = d->udma_mask;
1103
1104         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1105                 int rc;
1106
1107                 hwif->dma_ops = d->dma_ops;
1108
1109                 if (d->init_dma)
1110                         rc = d->init_dma(hwif, d);
1111                 else
1112                         rc = ide_hwif_setup_dma(hwif, d);
1113
1114                 if (rc < 0) {
1115                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1116
1117                         hwif->dma_ops = NULL;
1118                         hwif->dma_base = 0;
1119                         hwif->swdma_mask = 0;
1120                         hwif->mwdma_mask = 0;
1121                         hwif->ultra_mask = 0;
1122                 }
1123         }
1124
1125         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1126             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1127                 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1128
1129         if (d->max_sectors)
1130                 hwif->rqsize = d->max_sectors;
1131         else {
1132                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1133                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1134                         hwif->rqsize = 256;
1135                 else
1136                         hwif->rqsize = 65536;
1137         }
1138
1139         /* call chipset specific routine for each enabled port */
1140         if (d->init_hwif)
1141                 d->init_hwif(hwif);
1142 }
1143
1144 static void ide_port_cable_detect(ide_hwif_t *hwif)
1145 {
1146         const struct ide_port_ops *port_ops = hwif->port_ops;
1147
1148         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1149                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1150                         hwif->cbl = port_ops->cable_detect(hwif);
1151         }
1152 }
1153
1154 /*
1155  * Deferred request list insertion handler
1156  */
1157 static void drive_rq_insert_work(struct work_struct *work)
1158 {
1159         ide_drive_t *drive = container_of(work, ide_drive_t, rq_work);
1160         ide_hwif_t *hwif = drive->hwif;
1161         struct request *rq;
1162         blk_status_t ret;
1163         LIST_HEAD(list);
1164
1165         blk_mq_quiesce_queue(drive->queue);
1166
1167         ret = BLK_STS_OK;
1168         spin_lock_irq(&hwif->lock);
1169         while (!list_empty(&drive->rq_list)) {
1170                 rq = list_first_entry(&drive->rq_list, struct request, queuelist);
1171                 list_del_init(&rq->queuelist);
1172
1173                 spin_unlock_irq(&hwif->lock);
1174                 ret = ide_issue_rq(drive, rq, true);
1175                 spin_lock_irq(&hwif->lock);
1176         }
1177         spin_unlock_irq(&hwif->lock);
1178
1179         blk_mq_unquiesce_queue(drive->queue);
1180
1181         if (ret != BLK_STS_OK)
1182                 kblockd_schedule_work(&drive->rq_work);
1183 }
1184
1185 static const u8 ide_hwif_to_major[] =
1186         { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1187           IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1188
1189 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1190 {
1191         ide_drive_t *drive;
1192         int i;
1193
1194         ide_port_for_each_dev(i, drive, hwif) {
1195                 u8 j = (hwif->index * MAX_DRIVES) + i;
1196                 u16 *saved_id = drive->id;
1197
1198                 memset(drive, 0, sizeof(*drive));
1199                 memset(saved_id, 0, SECTOR_SIZE);
1200                 drive->id = saved_id;
1201
1202                 drive->media                    = ide_disk;
1203                 drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1204                 drive->hwif                     = hwif;
1205                 drive->ready_stat               = ATA_DRDY;
1206                 drive->bad_wstat                = BAD_W_STAT;
1207                 drive->special_flags            = IDE_SFLAG_RECALIBRATE |
1208                                                   IDE_SFLAG_SET_GEOMETRY;
1209                 drive->name[0]                  = 'h';
1210                 drive->name[1]                  = 'd';
1211                 drive->name[2]                  = 'a' + j;
1212                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1213
1214                 INIT_LIST_HEAD(&drive->list);
1215                 init_completion(&drive->gendev_rel_comp);
1216
1217                 INIT_WORK(&drive->rq_work, drive_rq_insert_work);
1218                 INIT_LIST_HEAD(&drive->rq_list);
1219         }
1220 }
1221
1222 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1223 {
1224         /* fill in any non-zero initial values */
1225         hwif->index     = index;
1226         hwif->major     = ide_hwif_to_major[index];
1227
1228         hwif->name[0]   = 'i';
1229         hwif->name[1]   = 'd';
1230         hwif->name[2]   = 'e';
1231         hwif->name[3]   = '0' + index;
1232
1233         spin_lock_init(&hwif->lock);
1234
1235         timer_setup(&hwif->timer, ide_timer_expiry, 0);
1236
1237         init_completion(&hwif->gendev_rel_comp);
1238
1239         hwif->tp_ops = &default_tp_ops;
1240
1241         ide_port_init_devices_data(hwif);
1242 }
1243
1244 static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1245 {
1246         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1247         hwif->irq = hw->irq;
1248         hwif->dev = hw->dev;
1249         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1250         hwif->config_data = hw->config;
1251 }
1252
1253 static unsigned int ide_indexes;
1254
1255 /**
1256  *      ide_find_port_slot      -       find free port slot
1257  *      @d: IDE port info
1258  *
1259  *      Return the new port slot index or -ENOENT if we are out of free slots.
1260  */
1261
1262 static int ide_find_port_slot(const struct ide_port_info *d)
1263 {
1264         int idx = -ENOENT;
1265         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1266         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1267
1268         /*
1269          * Claim an unassigned slot.
1270          *
1271          * Give preference to claiming other slots before claiming ide0/ide1,
1272          * just in case there's another interface yet-to-be-scanned
1273          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1274          *
1275          * Unless there is a bootable card that does not use the standard
1276          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1277          */
1278         mutex_lock(&ide_cfg_mtx);
1279         if (bootable) {
1280                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1281                         idx = ffz(ide_indexes | i);
1282         } else {
1283                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1284                         idx = ffz(ide_indexes | 3);
1285                 else if ((ide_indexes & 3) != 3)
1286                         idx = ffz(ide_indexes);
1287         }
1288         if (idx >= 0)
1289                 ide_indexes |= (1 << idx);
1290         mutex_unlock(&ide_cfg_mtx);
1291
1292         return idx;
1293 }
1294
1295 static void ide_free_port_slot(int idx)
1296 {
1297         mutex_lock(&ide_cfg_mtx);
1298         ide_indexes &= ~(1 << idx);
1299         mutex_unlock(&ide_cfg_mtx);
1300 }
1301
1302 static void ide_port_free_devices(ide_hwif_t *hwif)
1303 {
1304         ide_drive_t *drive;
1305         int i;
1306
1307         ide_port_for_each_dev(i, drive, hwif) {
1308                 kfree(drive->id);
1309                 kfree(drive);
1310         }
1311 }
1312
1313 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1314 {
1315         ide_drive_t *drive;
1316         int i;
1317
1318         for (i = 0; i < MAX_DRIVES; i++) {
1319                 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1320                 if (drive == NULL)
1321                         goto out_nomem;
1322
1323                 /*
1324                  * In order to keep things simple we have an id
1325                  * block for all drives at all times. If the device
1326                  * is pre ATA or refuses ATA/ATAPI identify we
1327                  * will add faked data to this.
1328                  *
1329                  * Also note that 0 everywhere means "can't do X"
1330                  */
1331                 drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1332                 if (drive->id == NULL)
1333                         goto out_free_drive;
1334
1335                 hwif->devices[i] = drive;
1336         }
1337         return 0;
1338
1339 out_free_drive:
1340         kfree(drive);
1341 out_nomem:
1342         ide_port_free_devices(hwif);
1343         return -ENOMEM;
1344 }
1345
1346 struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1347                                 struct ide_hw **hws, unsigned int n_ports)
1348 {
1349         struct ide_host *host;
1350         struct device *dev = hws[0] ? hws[0]->dev : NULL;
1351         int node = dev ? dev_to_node(dev) : -1;
1352         int i;
1353
1354         host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1355         if (host == NULL)
1356                 return NULL;
1357
1358         for (i = 0; i < n_ports; i++) {
1359                 ide_hwif_t *hwif;
1360                 int idx;
1361
1362                 if (hws[i] == NULL)
1363                         continue;
1364
1365                 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1366                 if (hwif == NULL)
1367                         continue;
1368
1369                 if (ide_port_alloc_devices(hwif, node) < 0) {
1370                         kfree(hwif);
1371                         continue;
1372                 }
1373
1374                 idx = ide_find_port_slot(d);
1375                 if (idx < 0) {
1376                         printk(KERN_ERR "%s: no free slot for interface\n",
1377                                         d ? d->name : "ide");
1378                         ide_port_free_devices(hwif);
1379                         kfree(hwif);
1380                         continue;
1381                 }
1382
1383                 ide_init_port_data(hwif, idx);
1384
1385                 hwif->host = host;
1386
1387                 host->ports[i] = hwif;
1388                 host->n_ports++;
1389         }
1390
1391         if (host->n_ports == 0) {
1392                 kfree(host);
1393                 return NULL;
1394         }
1395
1396         host->dev[0] = dev;
1397
1398         if (d) {
1399                 host->init_chipset = d->init_chipset;
1400                 host->get_lock     = d->get_lock;
1401                 host->release_lock = d->release_lock;
1402                 host->host_flags = d->host_flags;
1403                 host->irq_flags = d->irq_flags;
1404         }
1405
1406         return host;
1407 }
1408 EXPORT_SYMBOL_GPL(ide_host_alloc);
1409
1410 static void ide_port_free(ide_hwif_t *hwif)
1411 {
1412         ide_port_free_devices(hwif);
1413         ide_free_port_slot(hwif->index);
1414         kfree(hwif);
1415 }
1416
1417 static void ide_disable_port(ide_hwif_t *hwif)
1418 {
1419         struct ide_host *host = hwif->host;
1420         int i;
1421
1422         printk(KERN_INFO "%s: disabling port\n", hwif->name);
1423
1424         for (i = 0; i < MAX_HOST_PORTS; i++) {
1425                 if (host->ports[i] == hwif) {
1426                         host->ports[i] = NULL;
1427                         host->n_ports--;
1428                 }
1429         }
1430
1431         ide_port_free(hwif);
1432 }
1433
1434 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1435                       struct ide_hw **hws)
1436 {
1437         ide_hwif_t *hwif, *mate = NULL;
1438         int i, j = 0;
1439
1440         pr_warn("legacy IDE will be removed in 2021, please switch to libata\n"
1441                 "Report any missing HW support to linux-ide@vger.kernel.org\n");
1442
1443         ide_host_for_each_port(i, hwif, host) {
1444                 if (hwif == NULL) {
1445                         mate = NULL;
1446                         continue;
1447                 }
1448
1449                 ide_init_port_hw(hwif, hws[i]);
1450                 ide_port_apply_params(hwif);
1451
1452                 if ((i & 1) && mate) {
1453                         hwif->mate = mate;
1454                         mate->mate = hwif;
1455                 }
1456
1457                 mate = (i & 1) ? NULL : hwif;
1458
1459                 ide_init_port(hwif, i & 1, d);
1460                 ide_port_cable_detect(hwif);
1461
1462                 hwif->port_flags |= IDE_PFLAG_PROBING;
1463
1464                 ide_port_init_devices(hwif);
1465         }
1466
1467         ide_host_for_each_port(i, hwif, host) {
1468                 if (hwif == NULL)
1469                         continue;
1470
1471                 if (ide_probe_port(hwif) == 0)
1472                         hwif->present = 1;
1473
1474                 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1475
1476                 if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1477                     hwif->mate == NULL || hwif->mate->present == 0) {
1478                         if (ide_register_port(hwif)) {
1479                                 ide_disable_port(hwif);
1480                                 continue;
1481                         }
1482                 }
1483
1484                 if (hwif->present)
1485                         ide_port_tune_devices(hwif);
1486         }
1487
1488         ide_host_enable_irqs(host);
1489
1490         ide_host_for_each_port(i, hwif, host) {
1491                 if (hwif == NULL)
1492                         continue;
1493
1494                 if (hwif_init(hwif) == 0) {
1495                         printk(KERN_INFO "%s: failed to initialize IDE "
1496                                          "interface\n", hwif->name);
1497                         device_unregister(hwif->portdev);
1498                         device_unregister(&hwif->gendev);
1499                         ide_disable_port(hwif);
1500                         continue;
1501                 }
1502
1503                 if (hwif->present)
1504                         if (ide_port_setup_devices(hwif) == 0) {
1505                                 hwif->present = 0;
1506                                 continue;
1507                         }
1508
1509                 j++;
1510
1511                 ide_acpi_init_port(hwif);
1512
1513                 if (hwif->present)
1514                         ide_acpi_port_init_devices(hwif);
1515         }
1516
1517         ide_host_for_each_port(i, hwif, host) {
1518                 if (hwif == NULL)
1519                         continue;
1520
1521                 ide_sysfs_register_port(hwif);
1522                 ide_proc_register_port(hwif);
1523
1524                 if (hwif->present) {
1525                         ide_proc_port_register_devices(hwif);
1526                         hwif_register_devices(hwif);
1527                 }
1528         }
1529
1530         return j ? 0 : -1;
1531 }
1532 EXPORT_SYMBOL_GPL(ide_host_register);
1533
1534 int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1535                  unsigned int n_ports, struct ide_host **hostp)
1536 {
1537         struct ide_host *host;
1538         int rc;
1539
1540         host = ide_host_alloc(d, hws, n_ports);
1541         if (host == NULL)
1542                 return -ENOMEM;
1543
1544         rc = ide_host_register(host, d, hws);
1545         if (rc) {
1546                 ide_host_free(host);
1547                 return rc;
1548         }
1549
1550         if (hostp)
1551                 *hostp = host;
1552
1553         return 0;
1554 }
1555 EXPORT_SYMBOL_GPL(ide_host_add);
1556
1557 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1558 {
1559         ide_drive_t *drive;
1560         int i;
1561
1562         ide_port_for_each_present_dev(i, drive, hwif) {
1563                 device_unregister(&drive->gendev);
1564                 wait_for_completion(&drive->gendev_rel_comp);
1565         }
1566 }
1567
1568 void ide_port_unregister_devices(ide_hwif_t *hwif)
1569 {
1570         mutex_lock(&ide_cfg_mtx);
1571         __ide_port_unregister_devices(hwif);
1572         hwif->present = 0;
1573         ide_port_init_devices_data(hwif);
1574         mutex_unlock(&ide_cfg_mtx);
1575 }
1576 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1577
1578 /**
1579  *      ide_unregister          -       free an IDE interface
1580  *      @hwif: IDE interface
1581  *
1582  *      Perform the final unregister of an IDE interface.
1583  *
1584  *      Locking:
1585  *      The caller must not hold the IDE locks.
1586  *
1587  *      It is up to the caller to be sure there is no pending I/O here,
1588  *      and that the interface will not be reopened (present/vanishing
1589  *      locking isn't yet done BTW).
1590  */
1591
1592 static void ide_unregister(ide_hwif_t *hwif)
1593 {
1594         BUG_ON(in_interrupt());
1595         BUG_ON(irqs_disabled());
1596
1597         mutex_lock(&ide_cfg_mtx);
1598
1599         if (hwif->present) {
1600                 __ide_port_unregister_devices(hwif);
1601                 hwif->present = 0;
1602         }
1603
1604         ide_proc_unregister_port(hwif);
1605
1606         if (!hwif->host->get_lock)
1607                 free_irq(hwif->irq, hwif);
1608
1609         device_unregister(hwif->portdev);
1610         device_unregister(&hwif->gendev);
1611         wait_for_completion(&hwif->gendev_rel_comp);
1612
1613         /*
1614          * Remove us from the kernel's knowledge
1615          */
1616         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1617         kfree(hwif->sg_table);
1618         unregister_blkdev(hwif->major, hwif->name);
1619
1620         ide_release_dma_engine(hwif);
1621
1622         mutex_unlock(&ide_cfg_mtx);
1623 }
1624
1625 void ide_host_free(struct ide_host *host)
1626 {
1627         ide_hwif_t *hwif;
1628         int i;
1629
1630         ide_host_for_each_port(i, hwif, host) {
1631                 if (hwif)
1632                         ide_port_free(hwif);
1633         }
1634
1635         kfree(host);
1636 }
1637 EXPORT_SYMBOL_GPL(ide_host_free);
1638
1639 void ide_host_remove(struct ide_host *host)
1640 {
1641         ide_hwif_t *hwif;
1642         int i;
1643
1644         ide_host_for_each_port(i, hwif, host) {
1645                 if (hwif)
1646                         ide_unregister(hwif);
1647         }
1648
1649         ide_host_free(host);
1650 }
1651 EXPORT_SYMBOL_GPL(ide_host_remove);
1652
1653 void ide_port_scan(ide_hwif_t *hwif)
1654 {
1655         int rc;
1656
1657         ide_port_apply_params(hwif);
1658         ide_port_cable_detect(hwif);
1659
1660         hwif->port_flags |= IDE_PFLAG_PROBING;
1661
1662         ide_port_init_devices(hwif);
1663
1664         rc = ide_probe_port(hwif);
1665
1666         hwif->port_flags &= ~IDE_PFLAG_PROBING;
1667
1668         if (rc < 0)
1669                 return;
1670
1671         hwif->present = 1;
1672
1673         ide_port_tune_devices(hwif);
1674         ide_port_setup_devices(hwif);
1675         ide_acpi_port_init_devices(hwif);
1676         hwif_register_devices(hwif);
1677         ide_proc_port_register_devices(hwif);
1678 }
1679 EXPORT_SYMBOL_GPL(ide_port_scan);