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ide-probe.c

/*
 *  linux/drivers/ide/ide-probe.c   Version 1.11      Mar 05, 2003
 *
 *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
 */

/*
 *  Mostly written by Mark Lord <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the IDE probe module, as evolved from hd.c and ide.c.
 *
 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
 *     by Andrea Arcangeli
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/**
 *    generic_id        -     add a generic drive id
 *    @drive:     drive to make an ID block for
 *    
 *    Add a fake id field to the drive we are passed. This allows
 *    use to skip a ton of NULL checks (which people always miss) 
 *    and make drive properties unconditional outside of this file
 */
 
static void generic_id(ide_drive_t *drive)
{
      drive->id->cyls = drive->cyl;
      drive->id->heads = drive->head;
      drive->id->sectors = drive->sect;
      drive->id->cur_cyls = drive->cyl;
      drive->id->cur_heads = drive->head;
      drive->id->cur_sectors = drive->sect;
}

static void ide_disk_init_chs(ide_drive_t *drive)
{
      struct hd_driveid *id = drive->id;

      /* Extract geometry if we did not already have one for the drive */
      if (!drive->cyl || !drive->head || !drive->sect) {
            drive->cyl  = drive->bios_cyl  = id->cyls;
            drive->head = drive->bios_head = id->heads;
            drive->sect = drive->bios_sect = id->sectors;
      }

      /* Handle logical geometry translation by the drive */
      if ((id->field_valid & 1) && id->cur_cyls &&
          id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
            drive->cyl  = id->cur_cyls;
            drive->head = id->cur_heads;
            drive->sect = id->cur_sectors;
      }

      /* Use physical geometry if what we have still makes no sense */
      if (drive->head > 16 && id->heads && id->heads <= 16) {
            drive->cyl  = id->cyls;
            drive->head = id->heads;
            drive->sect = id->sectors;
      }
}

static void ide_disk_init_mult_count(ide_drive_t *drive)
{
      struct hd_driveid *id = drive->id;

      drive->mult_count = 0;
      if (id->max_multsect) {
#ifdef CONFIG_IDEDISK_MULTI_MODE
            id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
            id->multsect_valid = id->multsect ? 1 : 0;
            drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
            drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
#else /* original, pre IDE-NFG, per request of AC */
            drive->mult_req = INITIAL_MULT_COUNT;
            if (drive->mult_req > id->max_multsect)
                  drive->mult_req = id->max_multsect;
            if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
                  drive->special.b.set_multmode = 1;
#endif
      }
}

/**
 *    do_identify -     identify a drive
 *    @drive: drive to identify 
 *    @cmd: command used
 *
 *    Called when we have issued a drive identify command to
 *    read and parse the results. This function is run with
 *    interrupts disabled. 
 */
 
static inline void do_identify (ide_drive_t *drive, u8 cmd)
{
      ide_hwif_t *hwif = HWIF(drive);
      int bswap = 1;
      struct hd_driveid *id;

      id = drive->id;
      /* read 512 bytes of id info */
      hwif->ata_input_data(drive, id, SECTOR_WORDS);

      drive->id_read = 1;
      local_irq_enable();
      ide_fix_driveid(id);

#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
      /*
       * EATA SCSI controllers do a hardware ATA emulation:
       * Ignore them if there is a driver for them available.
       */
      if ((id->model[0] == 'P' && id->model[1] == 'M') ||
          (id->model[0] == 'S' && id->model[1] == 'K')) {
            printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
            goto err_misc;
      }
#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */

      /*
       *  WIN_IDENTIFY returns little-endian info,
       *  WIN_PIDENTIFY *usually* returns little-endian info.
       */
      if (cmd == WIN_PIDENTIFY) {
            if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
             || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
             || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
                  /* Vertos drives may still be weird */
                  bswap ^= 1; 
      }
      ide_fixstring(id->model,     sizeof(id->model),     bswap);
      ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
      ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);

      /* we depend on this a lot! */
      id->model[sizeof(id->model)-1] = '\0';

      if (strstr(id->model, "E X A B Y T E N E S T"))
            goto err_misc;

      printk("%s: %s, ", drive->name, id->model);
      drive->present = 1;
      drive->dead = 0;

      /*
       * Check for an ATAPI device
       */
      if (cmd == WIN_PIDENTIFY) {
            u8 type = (id->config >> 8) & 0x1f;
            printk("ATAPI ");
            switch (type) {
                  case ide_floppy:
                        if (!strstr(id->model, "CD-ROM")) {
                              if (!strstr(id->model, "oppy") &&
                                  !strstr(id->model, "poyp") &&
                                  !strstr(id->model, "ZIP"))
                                    printk("cdrom or floppy?, assuming ");
                              if (drive->media != ide_cdrom) {
                                    printk ("FLOPPY");
                                    drive->removable = 1;
                                    break;
                              }
                        }
                        /* Early cdrom models used zero */
                        type = ide_cdrom;
                  case ide_cdrom:
                        drive->removable = 1;
#ifdef CONFIG_PPC
                        /* kludge for Apple PowerBook internal zip */
                        if (!strstr(id->model, "CD-ROM") &&
                            strstr(id->model, "ZIP")) {
                              printk ("FLOPPY");
                              type = ide_floppy;
                              break;
                        }
#endif
                        printk ("CD/DVD-ROM");
                        break;
                  case ide_tape:
                        printk ("TAPE");
                        break;
                  case ide_optical:
                        printk ("OPTICAL");
                        drive->removable = 1;
                        break;
                  default:
                        printk("UNKNOWN (type %d)", type);
                        break;
            }
            printk (" drive\n");
            drive->media = type;
            /* an ATAPI device ignores DRDY */
            drive->ready_stat = 0;
            return;
      }

      /*
       * Not an ATAPI device: looks like a "regular" hard disk
       */

      /*
       * 0x848a = CompactFlash device
       * These are *not* removable in Linux definition of the term
       */

      if ((id->config != 0x848a) && (id->config & (1<<7)))
            drive->removable = 1;

      drive->media = ide_disk;
      printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
      QUIRK_LIST(drive);
      return;

err_misc:
      kfree(id);
      drive->present = 0;
      return;
}

/**
 *    actual_try_to_identify  -     send ata/atapi identify
 *    @drive: drive to identify
 *    @cmd: command to use
 *
 *    try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 *    and waits for a response.  It also monitors irqs while this is
 *    happening, in hope of automatically determining which one is
 *    being used by the interface.
 *
 *    Returns:    0  device was identified
 *                1  device timed-out (no response to identify request)
 *                2  device aborted the command (refused to identify itself)
 */

static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
{
      ide_hwif_t *hwif = HWIF(drive);
      int rc;
      unsigned long hd_status;
      unsigned long timeout;
      u8 s = 0, a = 0;

      /* take a deep breath */
      msleep(50);

      if (IDE_CONTROL_REG) {
            a = hwif->INB(IDE_ALTSTATUS_REG);
            s = hwif->INB(IDE_STATUS_REG);
            if ((a ^ s) & ~INDEX_STAT) {
                  printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
                        "ALTSTATUS(0x%02x)\n", drive->name, s, a);
                  /* ancient Seagate drives, broken interfaces */
                  hd_status = IDE_STATUS_REG;
            } else {
                  /* use non-intrusive polling */
                  hd_status = IDE_ALTSTATUS_REG;
            }
      } else
            hd_status = IDE_STATUS_REG;

      /* set features register for atapi
       * identify command to be sure of reply
       */
      if ((cmd == WIN_PIDENTIFY))
            /* disable dma & overlap */
            hwif->OUTB(0, IDE_FEATURE_REG);

      /* ask drive for ID */
      hwif->OUTB(cmd, IDE_COMMAND_REG);

      timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
      timeout += jiffies;
      do {
            if (time_after(jiffies, timeout)) {
                  /* drive timed-out */
                  return 1;
            }
            /* give drive a breather */
            msleep(50);
      } while ((hwif->INB(hd_status)) & BUSY_STAT);

      /* wait for IRQ and DRQ_STAT */
      msleep(50);
      if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
            unsigned long flags;

            /* local CPU only; some systems need this */
            local_irq_save(flags);
            /* drive returned ID */
            do_identify(drive, cmd);
            /* drive responded with ID */
            rc = 0;
            /* clear drive IRQ */
            (void) hwif->INB(IDE_STATUS_REG);
            local_irq_restore(flags);
      } else {
            /* drive refused ID */
            rc = 2;
      }
      return rc;
}

/**
 *    try_to_identify   -     try to identify a drive
 *    @drive: drive to probe
 *    @cmd: command to use
 *
 *    Issue the identify command and then do IRQ probing to
 *    complete the identification when needed by finding the
 *    IRQ the drive is attached to
 */
 
static int try_to_identify (ide_drive_t *drive, u8 cmd)
{
      ide_hwif_t *hwif = HWIF(drive);
      int retval;
      int autoprobe = 0;
      unsigned long cookie = 0;

      /*
       * Disable device irq unless we need to
       * probe for it. Otherwise we'll get spurious
       * interrupts during the identify-phase that
       * the irq handler isn't expecting.
       */
      if (IDE_CONTROL_REG) {
            u8 ctl = drive->ctl | 2;
            if (!hwif->irq) {
                  autoprobe = 1;
                  cookie = probe_irq_on();
                  /* enable device irq */
                  ctl &= ~2;
            }
            hwif->OUTB(ctl, IDE_CONTROL_REG);
      }

      retval = actual_try_to_identify(drive, cmd);

      if (autoprobe) {
            int irq;
            /* mask device irq */
            hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
            /* clear drive IRQ */
            (void) hwif->INB(IDE_STATUS_REG);
            udelay(5);
            irq = probe_irq_off(cookie);
            if (!hwif->irq) {
                  if (irq > 0) {
                        hwif->irq = irq;
                  } else {
                        /* Mmmm.. multiple IRQs..
                         * don't know which was ours
                         */
                        printk("%s: IRQ probe failed (0x%lx)\n",
                              drive->name, cookie);
                  }
            }
      }
      return retval;
}


/**
 *    do_probe          -     probe an IDE device
 *    @drive: drive to probe
 *    @cmd: command to use
 *
 *    do_probe() has the difficult job of finding a drive if it exists,
 *    without getting hung up if it doesn't exist, without trampling on
 *    ethernet cards, and without leaving any IRQs dangling to haunt us later.
 *
 *    If a drive is "known" to exist (from CMOS or kernel parameters),
 *    but does not respond right away, the probe will "hang in there"
 *    for the maximum wait time (about 30 seconds), otherwise it will
 *    exit much more quickly.
 *
 * Returns: 0  device was identified
 *          1  device timed-out (no response to identify request)
 *          2  device aborted the command (refused to identify itself)
 *          3  bad status from device (possible for ATAPI drives)
 *          4  probe was not attempted because failure was obvious
 */

static int do_probe (ide_drive_t *drive, u8 cmd)
{
      int rc;
      ide_hwif_t *hwif = HWIF(drive);

      if (drive->present) {
            /* avoid waiting for inappropriate probes */
            if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
                  return 4;
      }
#ifdef DEBUG
      printk("probing for %s: present=%d, media=%d, probetype=%s\n",
            drive->name, drive->present, drive->media,
            (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
#endif

      /* needed for some systems
       * (e.g. crw9624 as drive0 with disk as slave)
       */
      msleep(50);
      SELECT_DRIVE(drive);
      msleep(50);
      if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
            if (drive->select.b.unit != 0) {
                  /* exit with drive0 selected */
                  SELECT_DRIVE(&hwif->drives[0]);
                  /* allow BUSY_STAT to assert & clear */
                  msleep(50);
            }
            /* no i/f present: mmm.. this should be a 4 -ml */
            return 3;
      }

      if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
          drive->present || cmd == WIN_PIDENTIFY) {
            /* send cmd and wait */
            if ((rc = try_to_identify(drive, cmd))) {
                  /* failed: try again */
                  rc = try_to_identify(drive,cmd);
            }
            if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
                  return 4;

            if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
                  ((drive->autotune == IDE_TUNE_DEFAULT) ||
                  (drive->autotune == IDE_TUNE_AUTO))) {
                  unsigned long timeout;
                  printk("%s: no response (status = 0x%02x), "
                        "resetting drive\n", drive->name,
                        hwif->INB(IDE_STATUS_REG));
                  msleep(50);
                  hwif->OUTB(drive->select.all, IDE_SELECT_REG);
                  msleep(50);
                  hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
                  timeout = jiffies;
                  while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
                         time_before(jiffies, timeout + WAIT_WORSTCASE))
                        msleep(50);
                  rc = try_to_identify(drive, cmd);
            }
            if (rc == 1)
                  printk("%s: no response (status = 0x%02x)\n",
                        drive->name, hwif->INB(IDE_STATUS_REG));
            /* ensure drive irq is clear */
            (void) hwif->INB(IDE_STATUS_REG);
      } else {
            /* not present or maybe ATAPI */
            rc = 3;
      }
      if (drive->select.b.unit != 0) {
            /* exit with drive0 selected */
            SELECT_DRIVE(&hwif->drives[0]);
            msleep(50);
            /* ensure drive irq is clear */
            (void) hwif->INB(IDE_STATUS_REG);
      }
      return rc;
}

/*
 *
 */
static void enable_nest (ide_drive_t *drive)
{
      ide_hwif_t *hwif = HWIF(drive);
      unsigned long timeout;

      printk("%s: enabling %s -- ", hwif->name, drive->id->model);
      SELECT_DRIVE(drive);
      msleep(50);
      hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
      timeout = jiffies + WAIT_WORSTCASE;
      do {
            if (time_after(jiffies, timeout)) {
                  printk("failed (timeout)\n");
                  return;
            }
            msleep(50);
      } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);

      msleep(50);

      if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
            printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
      } else {
            printk("success\n");
      }

      /* if !(success||timed-out) */
      if (do_probe(drive, WIN_IDENTIFY) >= 2) {
            /* look for ATAPI device */
            (void) do_probe(drive, WIN_PIDENTIFY);
      }
}

/**
 *    probe_for_drives  -     upper level drive probe
 *    @drive: drive to probe for
 *
 *    probe_for_drive() tests for existence of a given drive using do_probe()
 *    and presents things to the user as needed.
 *
 *    Returns:    0  no device was found
 *                1  device was found (note: drive->present might
 *                   still be 0)
 */
 
static inline u8 probe_for_drive (ide_drive_t *drive)
{
      /*
       *    In order to keep things simple we have an id
       *    block for all drives at all times. If the device
       *    is pre ATA or refuses ATA/ATAPI identify we
       *    will add faked data to this.
       *
       *    Also note that 0 everywhere means "can't do X"
       */
 
      drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
      drive->id_read = 0;
      if(drive->id == NULL)
      {
            printk(KERN_ERR "ide: out of memory for id data.\n");
            return 0;
      }
      strcpy(drive->id->model, "UNKNOWN");
      
      /* skip probing? */
      if (!drive->noprobe)
      {
            /* if !(success||timed-out) */
            if (do_probe(drive, WIN_IDENTIFY) >= 2) {
                  /* look for ATAPI device */
                  (void) do_probe(drive, WIN_PIDENTIFY);
            }
            if (!drive->present)
                  /* drive not found */
                  return 0;
            if (strstr(drive->id->model, "E X A B Y T E N E S T"))
                  enable_nest(drive);
      
            /* identification failed? */
            if (!drive->id_read) {
                  if (drive->media == ide_disk) {
                        printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
                              drive->name, drive->cyl,
                              drive->head, drive->sect);
                  } else if (drive->media == ide_cdrom) {
                        printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
                  } else {
                        /* nuke it */
                        printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
                        drive->present = 0;
                  }
            }
            /* drive was found */
      }
      if(!drive->present)
            return 0;
      /* The drive wasn't being helpful. Add generic info only */
      if (drive->id_read == 0) {
            generic_id(drive);
            return 1;
      }

      if (drive->media == ide_disk) {
            ide_disk_init_chs(drive);
            ide_disk_init_mult_count(drive);
      }

      return drive->present;
}

static void hwif_release_dev (struct device *dev)
{
      ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);

      complete(&hwif->gendev_rel_comp);
}

static void hwif_register (ide_hwif_t *hwif)
{
      int ret;

      /* register with global device tree */
      strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
      hwif->gendev.driver_data = hwif;
      if (hwif->gendev.parent == NULL) {
            if (hwif->pci_dev)
                  hwif->gendev.parent = &hwif->pci_dev->dev;
            else
                  /* Would like to do = &device_legacy */
                  hwif->gendev.parent = NULL;
      }
      hwif->gendev.release = hwif_release_dev;
      ret = device_register(&hwif->gendev);
      if (ret < 0)
            printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
                  __FUNCTION__, ret);
}

static int wait_hwif_ready(ide_hwif_t *hwif)
{
      int unit, rc;

      printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);

      /* Let HW settle down a bit from whatever init state we
       * come from */
      mdelay(2);

      /* Wait for BSY bit to go away, spec timeout is 30 seconds,
       * I know of at least one disk who takes 31 seconds, I use 35
       * here to be safe
       */
      rc = ide_wait_not_busy(hwif, 35000);
      if (rc)
            return rc;

      /* Now make sure both master & slave are ready */
      for (unit = 0; unit < MAX_DRIVES; unit++) {
            ide_drive_t *drive = &hwif->drives[unit];

            /* Ignore disks that we will not probe for later. */
            if (!drive->noprobe || drive->present) {
                  SELECT_DRIVE(drive);
                  if (IDE_CONTROL_REG)
                        hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
                  mdelay(2);
                  rc = ide_wait_not_busy(hwif, 35000);
                  if (rc)
                        goto out;
            } else
                  printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
                                drive->name);
      }
out:
      /* Exit function with master reselected (let's be sane) */
      if (unit)
            SELECT_DRIVE(&hwif->drives[0]);

      return rc;
}

/**
 *    ide_undecoded_slave     -     look for bad CF adapters
 *    @hwif: interface
 *
 *    Analyse the drives on the interface and attempt to decide if we
 *    have the same drive viewed twice. This occurs with crap CF adapters
 *    and PCMCIA sometimes.
 */

void ide_undecoded_slave(ide_hwif_t *hwif)
{
      ide_drive_t *drive0 = &hwif->drives[0];
      ide_drive_t *drive1 = &hwif->drives[1];

      if (drive0->present == 0 || drive1->present == 0)
            return;

      /* If the models don't match they are not the same product */
      if (strcmp(drive0->id->model, drive1->id->model))
            return;

      /* Serial numbers do not match */
      if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
            return;

      /* No serial number, thankfully very rare for CF */
      if (drive0->id->serial_no[0] == 0)
            return;

      /* Appears to be an IDE flash adapter with decode bugs */
      printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");

      drive1->present = 0;
}

EXPORT_SYMBOL_GPL(ide_undecoded_slave);

/*
 * This routine only knows how to look for drive units 0 and 1
 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 */
static void probe_hwif(ide_hwif_t *hwif)
{
      unsigned long flags;
      unsigned int irqd;
      int unit;

      if (hwif->noprobe)
            return;

      if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
          (ide_hwif_request_regions(hwif))) {
            u16 msgout = 0;
            for (unit = 0; unit < MAX_DRIVES; ++unit) {
                  ide_drive_t *drive = &hwif->drives[unit];
                  if (drive->present) {
                        drive->present = 0;
                        printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
                              drive->name);
                        msgout = 1;
                  }
            }
            if (!msgout)
                  printk(KERN_ERR "%s: ports already in use, skipping probe\n",
                        hwif->name);
            return;     
      }

      /*
       * We must always disable IRQ, as probe_for_drive will assert IRQ, but
       * we'll install our IRQ driver much later...
       */
      irqd = hwif->irq;
      if (irqd)
            disable_irq(hwif->irq);

      local_irq_set(flags);

      /* This is needed on some PPCs and a bunch of BIOS-less embedded
       * platforms. Typical cases are:
       * 
       *  - The firmware hard reset the disk before booting the kernel,
       *    the drive is still doing it's poweron-reset sequence, that
       *    can take up to 30 seconds
       *  - The firmware does nothing (or no firmware), the device is
       *    still in POST state (same as above actually).
       *  - Some CD/DVD/Writer combo drives tend to drive the bus during
       *    their reset sequence even when they are non-selected slave
       *    devices, thus preventing discovery of the main HD
       *    
       *  Doing this wait-for-busy should not harm any existing configuration
       *  (at least things won't be worse than what current code does, that
       *  is blindly go & talk to the drive) and fix some issues like the
       *  above.
       *  
       *  BenH.
       */
      if (wait_hwif_ready(hwif) == -EBUSY)
            printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);

      /*
       * Need to probe slave device first to make it release PDIAG-.
       */
      for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
            ide_drive_t *drive = &hwif->drives[unit];
            drive->dn = (hwif->channel ? 2 : 0) + unit;
            (void) probe_for_drive(drive);
            if (drive->present && !hwif->present) {
                  hwif->present = 1;
                  if (hwif->chipset != ide_4drives ||
                      !hwif->mate || 
                      !hwif->mate->present) {
                        hwif_register(hwif);
                  }
            }
      }
      if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
            unsigned long timeout = jiffies + WAIT_WORSTCASE;
            u8 stat;

            printk(KERN_WARNING "%s: reset\n", hwif->name);
            hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
            udelay(10);
            hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
            do {
                  msleep(50);
                  stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
            } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));

      }
      local_irq_restore(flags);
      /*
       * Use cached IRQ number. It might be (and is...) changed by probe
       * code above
       */
      if (irqd)
            enable_irq(irqd);

      if (!hwif->present) {
            ide_hwif_release_regions(hwif);
            return;
      }

      if (hwif->fixup)
            hwif->fixup(hwif);

      for (unit = 0; unit < MAX_DRIVES; ++unit) {
            ide_drive_t *drive = &hwif->drives[unit];

            if (drive->present) {
                  if (drive->autotune == IDE_TUNE_AUTO)
                        ide_set_max_pio(drive);

                  if (drive->autotune != IDE_TUNE_DEFAULT &&
                      drive->autotune != IDE_TUNE_AUTO)
                        continue;

                  drive->nice1 = 1;

                  if (hwif->ide_dma_on) {
                        /*
                         * Force DMAing for the beginning of the check.
                         * Some chipsets appear to do interesting
                         * things, if not checked and cleared.
                         *   PARANOIA!!!
                         */
                        hwif->dma_off_quietly(drive);
                        ide_set_dma(drive);
                  }
            }
      }

      for (unit = 0; unit < MAX_DRIVES; ++unit) {
            ide_drive_t *drive = &hwif->drives[unit];

            if (hwif->no_io_32bit)
                  drive->no_io_32bit = 1;
            else
                  drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
      }
}

static int hwif_init(ide_hwif_t *hwif);
static void hwif_register_devices(ide_hwif_t *hwif);

static int probe_hwif_init(ide_hwif_t *hwif)
{
      probe_hwif(hwif);

      if (!hwif_init(hwif)) {
            printk(KERN_INFO "%s: failed to initialize IDE interface\n",
                         hwif->name);
            return -1;
      }

      if (hwif->present)
            hwif_register_devices(hwif);

      return 0;
}

#if MAX_HWIFS > 1
/*
 * save_match() is used to simplify logic in init_irq() below.
 *
 * A loophole here is that we may not know about a particular
 * hwif's irq until after that hwif is actually probed/initialized..
 * This could be a problem for the case where an hwif is on a
 * dual interface that requires serialization (eg. cmd640) and another
 * hwif using one of the same irqs is initialized beforehand.
 *
 * This routine detects and reports such situations, but does not fix them.
 */
static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
{
      ide_hwif_t *m = *match;

      if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
            if (!new->hwgroup)
                  return;
            printk("%s: potential irq problem with %s and %s\n",
                  hwif->name, new->name, m->name);
      }
      if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
            *match = new;
}
#endif /* MAX_HWIFS > 1 */

/*
 * init request queue
 */
static int ide_init_queue(ide_drive_t *drive)
{
      struct request_queue *q;
      ide_hwif_t *hwif = HWIF(drive);
      int max_sectors = 256;
      int max_sg_entries = PRD_ENTRIES;

      /*
       *    Our default set up assumes the normal IDE case,
       *    that is 64K segmenting, standard PRD setup
       *    and LBA28. Some drivers then impose their own
       *    limits and LBA48 we could raise it but as yet
       *    do not.
       */

      q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
      if (!q)
            return 1;

      q->queuedata = drive;
      blk_queue_segment_boundary(q, 0xffff);

      if (!hwif->rqsize) {
            if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
                (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
                  hwif->rqsize = 256;
            else
                  hwif->rqsize = 65536;
      }
      if (hwif->rqsize < max_sectors)
            max_sectors = hwif->rqsize;
      blk_queue_max_sectors(q, max_sectors);

#ifdef CONFIG_PCI
      /* When we have an IOMMU, we may have a problem where pci_map_sg()
       * creates segments that don't completely match our boundary
       * requirements and thus need to be broken up again. Because it
       * doesn't align properly either, we may actually have to break up
       * to more segments than what was we got in the first place, a max
       * worst case is twice as many.
       * This will be fixed once we teach pci_map_sg() about our boundary
       * requirements, hopefully soon. *FIXME*
       */
      if (!PCI_DMA_BUS_IS_PHYS)
            max_sg_entries >>= 1;
#endif /* CONFIG_PCI */

      blk_queue_max_hw_segments(q, max_sg_entries);
      blk_queue_max_phys_segments(q, max_sg_entries);

      /* assign drive queue */
      drive->queue = q;

      /* needs drive->queue to be set */
      ide_toggle_bounce(drive, 1);

      return 0;
}

/*
 * This routine sets up the irq for an ide interface, and creates a new
 * hwgroup for the irq/hwif if none was previously assigned.
 *
 * Much of the code is for correctly detecting/handling irq sharing
 * and irq serialization situations.  This is somewhat complex because
 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 *
 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
 * interrupts completely disabled.  This can be bad for interrupt latency,
 * but anything else has led to problems on some machines.  We re-enable
 * interrupts as much as we can safely do in most places.
 */
static int init_irq (ide_hwif_t *hwif)
{
      unsigned int index;
      ide_hwgroup_t *hwgroup;
      ide_hwif_t *match = NULL;


      BUG_ON(in_interrupt());
      BUG_ON(irqs_disabled());      
      BUG_ON(hwif == NULL);

      mutex_lock(&ide_cfg_mtx);
      hwif->hwgroup = NULL;
#if MAX_HWIFS > 1
      /*
       * Group up with any other hwifs that share our irq(s).
       */
      for (index = 0; index < MAX_HWIFS; index++) {
            ide_hwif_t *h = &ide_hwifs[index];
            if (h->hwgroup) {  /* scan only initialized hwif's */
                  if (hwif->irq == h->irq) {
                        hwif->sharing_irq = h->sharing_irq = 1;
                        if (hwif->chipset != ide_pci ||
                            h->chipset != ide_pci) {
                              save_match(hwif, h, &match);
                        }
                  }
                  if (hwif->serialized) {
                        if (hwif->mate && hwif->mate->irq == h->irq)
                              save_match(hwif, h, &match);
                  }
                  if (h->serialized) {
                        if (h->mate && hwif->irq == h->mate->irq)
                              save_match(hwif, h, &match);
                  }
            }
      }
#endif /* MAX_HWIFS > 1 */
      /*
       * If we are still without a hwgroup, then form a new one
       */
      if (match) {
            hwgroup = match->hwgroup;
            hwif->hwgroup = hwgroup;
            /*
             * Link us into the hwgroup.
             * This must be done early, do ensure that unexpected_intr
             * can find the hwif and prevent irq storms.
             * No drives are attached to the new hwif, choose_drive
             * can't do anything stupid (yet).
             * Add ourself as the 2nd entry to the hwgroup->hwif
             * linked list, the first entry is the hwif that owns
             * hwgroup->handler - do not change that.
             */
            spin_lock_irq(&ide_lock);
            hwif->next = hwgroup->hwif->next;
            hwgroup->hwif->next = hwif;
            spin_unlock_irq(&ide_lock);
      } else {
            hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
                              GFP_KERNEL | __GFP_ZERO,
                              hwif_to_node(hwif->drives[0].hwif));
            if (!hwgroup)
                        goto out_up;

            hwif->hwgroup = hwgroup;

            hwgroup->hwif     = hwif->next = hwif;
            hwgroup->rq       = NULL;
            hwgroup->handler  = NULL;
            hwgroup->drive    = NULL;
            hwgroup->busy     = 0;
            init_timer(&hwgroup->timer);
            hwgroup->timer.function = &ide_timer_expiry;
            hwgroup->timer.data = (unsigned long) hwgroup;
      }

      /*
       * Allocate the irq, if not already obtained for another hwif
       */
      if (!match || match->irq != hwif->irq) {
            int sa = IRQF_DISABLED;
#if defined(__mc68000__) || defined(CONFIG_APUS)
            sa = IRQF_SHARED;
#endif /* __mc68000__ || CONFIG_APUS */

            if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
                  sa = IRQF_SHARED;
#ifndef CONFIG_IDEPCI_SHARE_IRQ
                  sa |= IRQF_DISABLED;
#endif /* CONFIG_IDEPCI_SHARE_IRQ */
            }

            if (hwif->io_ports[IDE_CONTROL_OFFSET])
                  /* clear nIEN */
                  hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);

            if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
                        goto out_unlink;
      }

      /*
       * For any present drive:
       * - allocate the block device queue
       * - link drive into the hwgroup
       */
      for (index = 0; index < MAX_DRIVES; ++index) {
            ide_drive_t *drive = &hwif->drives[index];
            if (!drive->present)
                  continue;
            if (ide_init_queue(drive)) {
                  printk(KERN_ERR "ide: failed to init %s\n",drive->name);
                  continue;
            }
            spin_lock_irq(&ide_lock);
            if (!hwgroup->drive) {
                  /* first drive for hwgroup. */
                  drive->next = drive;
                  hwgroup->drive = drive;
                  hwgroup->hwif = HWIF(hwgroup->drive);
            } else {
                  drive->next = hwgroup->drive->next;
                  hwgroup->drive->next = drive;
            }
            spin_unlock_irq(&ide_lock);
      }

#if !defined(__mc68000__) && !defined(CONFIG_APUS)
      printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
            hwif->io_ports[IDE_DATA_OFFSET],
            hwif->io_ports[IDE_DATA_OFFSET]+7,
            hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
#else
      printk("%s at 0x%08lx on irq %d", hwif->name,
            hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
#endif /* __mc68000__ && CONFIG_APUS */
      if (match)
            printk(" (%sed with %s)",
                  hwif->sharing_irq ? "shar" : "serializ", match->name);
      printk("\n");
      mutex_unlock(&ide_cfg_mtx);
      return 0;
out_unlink:
      spin_lock_irq(&ide_lock);
      if (hwif->next == hwif) {
            BUG_ON(match);
            BUG_ON(hwgroup->hwif != hwif);
            kfree(hwgroup);
      } else {
            ide_hwif_t *g;
            g = hwgroup->hwif;
            while (g->next != hwif)
                  g = g->next;
            g->next = hwif->next;
            if (hwgroup->hwif == hwif) {
                  /* Impossible. */
                  printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
                  hwgroup->hwif = g;
            }
            BUG_ON(hwgroup->hwif == hwif);
      }
      spin_unlock_irq(&ide_lock);
out_up:
      mutex_unlock(&ide_cfg_mtx);
      return 1;
}

static int ata_lock(dev_t dev, void *data)
{
      /* FIXME: we want to pin hwif down */
      return 0;
}

static struct kobject *ata_probe(dev_t dev, int *part, void *data)
{
      ide_hwif_t *hwif = data;
      int unit = *part >> PARTN_BITS;
      ide_drive_t *drive = &hwif->drives[unit];
      if (!drive->present)
            return NULL;

      if (drive->media == ide_disk)
            request_module("ide-disk");
      if (drive->scsi)
            request_module("ide-scsi");
      if (drive->media == ide_cdrom || drive->media == ide_optical)
            request_module("ide-cd");
      if (drive->media == ide_tape)
            request_module("ide-tape");
      if (drive->media == ide_floppy)
            request_module("ide-floppy");

      return NULL;
}

static struct kobject *exact_match(dev_t dev, int *part, void *data)
{
      struct gendisk *p = data;
      *part &= (1 << PARTN_BITS) - 1;
      return &p->kobj;
}

static int exact_lock(dev_t dev, void *data)
{
      struct gendisk *p = data;

      if (!get_disk(p))
            return -1;
      return 0;
}

void ide_register_region(struct gendisk *disk)
{
      blk_register_region(MKDEV(disk->major, disk->first_minor),
                      disk->minors, NULL, exact_match, exact_lock, disk);
}

EXPORT_SYMBOL_GPL(ide_register_region);

void ide_unregister_region(struct gendisk *disk)
{
      blk_unregister_region(MKDEV(disk->major, disk->first_minor),
                        disk->minors);
}

EXPORT_SYMBOL_GPL(ide_unregister_region);

void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
{
      ide_hwif_t *hwif = drive->hwif;
      unsigned int unit = (drive->select.all >> 4) & 1;

      disk->major = hwif->major;
      disk->first_minor = unit << PARTN_BITS;
      sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
      disk->queue = drive->queue;
}

EXPORT_SYMBOL_GPL(ide_init_disk);

static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
{
      ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;

      if (drive == drive->next) {
            /* special case: last drive from hwgroup. */
            BUG_ON(hwgroup->drive != drive);
            hwgroup->drive = NULL;
      } else {
            ide_drive_t *walk;

            walk = hwgroup->drive;
            while (walk->next != drive)
                  walk = walk->next;
            walk->next = drive->next;
            if (hwgroup->drive == drive) {
                  hwgroup->drive = drive->next;
                  hwgroup->hwif = hwgroup->drive->hwif;
            }
      }
      BUG_ON(hwgroup->drive == drive);
}

static void drive_release_dev (struct device *dev)
{
      ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

      spin_lock_irq(&ide_lock);
      ide_remove_drive_from_hwgroup(drive);
      kfree(drive->id);
      drive->id = NULL;
      drive->present = 0;
      /* Messed up locking ... */
      spin_unlock_irq(&ide_lock);
      blk_cleanup_queue(drive->queue);
      spin_lock_irq(&ide_lock);
      drive->queue = NULL;
      spin_unlock_irq(&ide_lock);

      complete(&drive->gendev_rel_comp);
}

/*
 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
 * after probing for drives, to allocate partition tables and other data
 * structures needed for the routines in genhd.c.  ide_geninit() gets called
 * somewhat later, during the partition check.
 */
static void init_gendisk (ide_hwif_t *hwif)
{
      unsigned int unit;

      for (unit = 0; unit < MAX_DRIVES; ++unit) {
            ide_drive_t * drive = &hwif->drives[unit];
            ide_add_generic_settings(drive);
            snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
                   hwif->index,unit);
            drive->gendev.parent = &hwif->gendev;
            drive->gendev.bus = &ide_bus_type;
            drive->gendev.driver_data = drive;
            drive->gendev.release = drive_release_dev;
      }
      blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
                  THIS_MODULE, ata_probe, ata_lock, hwif);
}

static int hwif_init(ide_hwif_t *hwif)
{
      int old_irq;

      /* Return success if no device is connected */
      if (!hwif->present)
            return 1;

      if (!hwif->irq) {
            if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
            {
                  printk("%s: DISABLED, NO IRQ\n", hwif->name);
                  return (hwif->present = 0);
            }
      }
#ifdef CONFIG_BLK_DEV_HD
      if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
            printk("%s: CANNOT SHARE IRQ WITH OLD "
                  "HARDDISK DRIVER (hd.c)\n", hwif->name);
            return (hwif->present = 0);
      }
#endif /* CONFIG_BLK_DEV_HD */

      /* we set it back to 1 if all is ok below */    
      hwif->present = 0;

      if (register_blkdev(hwif->major, hwif->name))
            return 0;

      if (!hwif->sg_max_nents)
            hwif->sg_max_nents = PRD_ENTRIES;

      hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
                         GFP_KERNEL);
      if (!hwif->sg_table) {
            printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
            goto out;
      }

      sg_init_table(hwif->sg_table, hwif->sg_max_nents);
      
      if (init_irq(hwif) == 0)
            goto done;

      old_irq = hwif->irq;
      /*
       *    It failed to initialise. Find the default IRQ for 
       *    this port and try that.
       */
      if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
            printk("%s: Disabled unable to get IRQ %d.\n",
                  hwif->name, old_irq);
            goto out;
      }
      if (init_irq(hwif)) {
            printk("%s: probed IRQ %d and default IRQ %d failed.\n",
                  hwif->name, old_irq, hwif->irq);
            goto out;
      }
      printk("%s: probed IRQ %d failed, using default.\n",
            hwif->name, hwif->irq);

done:
      init_gendisk(hwif);

      ide_acpi_init(hwif);

      hwif->present = 1;      /* success */
      return 1;

out:
      unregister_blkdev(hwif->major, hwif->name);
      return 0;
}

static void hwif_register_devices(ide_hwif_t *hwif)
{
      unsigned int i;

      for (i = 0; i < MAX_DRIVES; i++) {
            ide_drive_t *drive = &hwif->drives[i];

            if (drive->present) {
                  int ret = device_register(&drive->gendev);

                  if (ret < 0)
                        printk(KERN_WARNING "IDE: %s: "
                              "device_register error: %d\n",
                              __FUNCTION__, ret);
            }
      }
}

int ideprobe_init (void)
{
      unsigned int index;
      int probe[MAX_HWIFS];

      memset(probe, 0, MAX_HWIFS * sizeof(int));
      for (index = 0; index < MAX_HWIFS; ++index)
            probe[index] = !ide_hwifs[index].present;

      for (index = 0; index < MAX_HWIFS; ++index)
            if (probe[index])
                  probe_hwif(&ide_hwifs[index]);
      for (index = 0; index < MAX_HWIFS; ++index)
            if (probe[index])
                  hwif_init(&ide_hwifs[index]);
      for (index = 0; index < MAX_HWIFS; ++index) {
            if (probe[index]) {
                  ide_hwif_t *hwif = &ide_hwifs[index];
                  if (!hwif->present)
                        continue;
                  if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
                        hwif->chipset = ide_generic;
                  hwif_register_devices(hwif);
            }
      }
      for (index = 0; index < MAX_HWIFS; ++index)
            if (probe[index])
                  ide_proc_register_port(&ide_hwifs[index]);
      return 0;
}

EXPORT_SYMBOL_GPL(ideprobe_init);

int ide_device_add(u8 idx[4])
{
      int i, rc = 0;

      for (i = 0; i < 4; i++) {
            if (idx[i] != 0xff)
                  rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
      }

      for (i = 0; i < 4; i++) {
            if (idx[i] != 0xff)
                  ide_proc_register_port(&ide_hwifs[idx[i]]);
      }

      return rc;
}

EXPORT_SYMBOL_GPL(ide_device_add);

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