ide-probe.c 36.7 KB
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/*
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 *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
 *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
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 */

/*
 *  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.
 *
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 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
 *	 by Andrea Arcangeli
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 */

#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>
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#include <linux/scatterlist.h>
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#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)
{
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	u16 *id = drive->id;

	id[ATA_ID_CUR_CYLS]	= id[ATA_ID_CYLS]	= drive->cyl;
	id[ATA_ID_CUR_HEADS]	= id[ATA_ID_HEADS]	= drive->head;
	id[ATA_ID_CUR_SECTORS]	= id[ATA_ID_SECTORS]	= drive->sect;
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}

static void ide_disk_init_chs(ide_drive_t *drive)
{
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	u16 *id = drive->id;
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	/* Extract geometry if we did not already have one for the drive */
	if (!drive->cyl || !drive->head || !drive->sect) {
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		drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
		drive->head = drive->bios_head = id[ATA_ID_HEADS];
		drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
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	}

	/* Handle logical geometry translation by the drive */
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	if (ata_id_current_chs_valid(id)) {
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		drive->cyl  = id[ATA_ID_CUR_CYLS];
		drive->head = id[ATA_ID_CUR_HEADS];
		drive->sect = id[ATA_ID_CUR_SECTORS];
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	}

	/* Use physical geometry if what we have still makes no sense */
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	if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
		drive->cyl  = id[ATA_ID_CYLS];
		drive->head = id[ATA_ID_HEADS];
		drive->sect = id[ATA_ID_SECTORS];
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	}
}

static void ide_disk_init_mult_count(ide_drive_t *drive)
{
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	u16 *id = drive->id;
	u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
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	if (max_multsect) {
		if ((max_multsect / 2) > 1)
			id[ATA_ID_MULTSECT] = max_multsect | 0x100;
		else
			id[ATA_ID_MULTSECT] &= ~0x1ff;

		drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
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		if (drive->mult_req)
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			drive->special.b.set_multmode = 1;
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	}
}

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static void ide_classify_ata_dev(ide_drive_t *drive)
{
	u16 *id = drive->id;
	char *m = (char *)&id[ATA_ID_PROD];
	int is_cfa = ata_id_is_cfa(id);

	/* CF devices are *not* removable in Linux definition of the term */
	if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
		drive->dev_flags |= IDE_DFLAG_REMOVABLE;

	drive->media = ide_disk;

	if (!ata_id_has_unload(drive->id))
		drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;

	printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
		is_cfa ? "CFA" : "ATA");
}

static void ide_classify_atapi_dev(ide_drive_t *drive)
{
	u16 *id = drive->id;
	char *m = (char *)&id[ATA_ID_PROD];
	u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;

	printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
	switch (type) {
	case ide_floppy:
		if (!strstr(m, "CD-ROM")) {
			if (!strstr(m, "oppy") &&
			    !strstr(m, "poyp") &&
			    !strstr(m, "ZIP"))
				printk(KERN_CONT "cdrom or floppy?, assuming ");
			if (drive->media != ide_cdrom) {
				printk(KERN_CONT "FLOPPY");
				drive->dev_flags |= IDE_DFLAG_REMOVABLE;
				break;
			}
		}
		/* Early cdrom models used zero */
		type = ide_cdrom;
	case ide_cdrom:
		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
#ifdef CONFIG_PPC
		/* kludge for Apple PowerBook internal zip */
		if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
			printk(KERN_CONT "FLOPPY");
			type = ide_floppy;
			break;
		}
#endif
		printk(KERN_CONT "CD/DVD-ROM");
		break;
	case ide_tape:
		printk(KERN_CONT "TAPE");
		break;
	case ide_optical:
		printk(KERN_CONT "OPTICAL");
		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
		break;
	default:
		printk(KERN_CONT "UNKNOWN (type %d)", type);
		break;
	}

	printk(KERN_CONT " drive\n");
	drive->media = type;
	/* an ATAPI device ignores DRDY */
	drive->ready_stat = 0;
	if (ata_id_cdb_intr(id))
		drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
	drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
	/* we don't do head unloading on ATAPI devices */
	drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
}

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/**
 *	do_identify	-	identify a drive
 *	@drive: drive to identify 
 *	@cmd: command used
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 *	@id: buffer for IDENTIFY data
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 *
 *	Called when we have issued a drive identify command to
 *	read and parse the results. This function is run with
 *	interrupts disabled. 
 */
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static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
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{
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	ide_hwif_t *hwif = drive->hwif;
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	char *m = (char *)&id[ATA_ID_PROD];
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	unsigned long flags;
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	int bswap = 1;
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	/* local CPU only; some systems need this */
	local_irq_save(flags);
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	/* read 512 bytes of id info */
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	hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
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	local_irq_restore(flags);
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	drive->dev_flags |= IDE_DFLAG_ID_READ;
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#ifdef DEBUG
	printk(KERN_INFO "%s: dumping identify data\n", drive->name);
	ide_dump_identify((u8 *)id);
#endif
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	ide_fix_driveid(id);

	/*
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	 *  ATA_CMD_ID_ATA returns little-endian info,
	 *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
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	 */
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	if (cmd == ATA_CMD_ID_ATAPI) {
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		if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
		    (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
		    (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
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			/* Vertos drives may still be weird */
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			bswap ^= 1;
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	}
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	ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
	ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
	ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
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	/* we depend on this a lot! */
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	m[ATA_ID_PROD_LEN - 1] = '\0';
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	if (strstr(m, "E X A B Y T E N E S T"))
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		drive->dev_flags &= ~IDE_DFLAG_PRESENT;
	else
		drive->dev_flags |= IDE_DFLAG_PRESENT;
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}

/**
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 *	ide_dev_read_id	-	send ATA/ATAPI IDENTIFY command
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 *	@drive: drive to identify
 *	@cmd: command to use
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 *	@id: buffer for IDENTIFY data
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 *
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 *	Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
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 *
 *	Returns:	0  device was identified
 *			1  device timed-out (no response to identify request)
 *			2  device aborted the command (refused to identify itself)
 */

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int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
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{
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	ide_hwif_t *hwif = drive->hwif;
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	struct ide_io_ports *io_ports = &hwif->io_ports;
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	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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	int use_altstatus = 0, rc;
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	unsigned long timeout;
	u8 s = 0, a = 0;

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	/*
	 * Disable device IRQ.  Otherwise we'll get spurious interrupts
	 * during the identify phase that the IRQ handler isn't expecting.
	 */
	if (io_ports->ctl_addr)
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		tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
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	/* take a deep breath */
	msleep(50);

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	if (io_ports->ctl_addr &&
	    (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
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		a = tp_ops->read_altstatus(hwif);
		s = tp_ops->read_status(hwif);
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		if ((a ^ s) & ~ATA_IDX)
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			/* ancient Seagate drives, broken interfaces */
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			printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
					 "instead of ALTSTATUS(0x%02x)\n",
					 drive->name, s, a);
		else
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			/* use non-intrusive polling */
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			use_altstatus = 1;
	}
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	/* set features register for atapi
	 * identify command to be sure of reply
	 */
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	if (cmd == ATA_CMD_ID_ATAPI) {
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		struct ide_taskfile tf;
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		memset(&tf, 0, sizeof(tf));
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		/* disable DMA & overlap */
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		tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
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	}
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	/* ask drive for ID */
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	tp_ops->exec_command(hwif, cmd);
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	timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
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	if (ide_busy_sleep(hwif, timeout, use_altstatus))
		return 1;
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	/* wait for IRQ and ATA_DRQ */
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	msleep(50);
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	s = tp_ops->read_status(hwif);
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	if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
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		/* drive returned ID */
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		do_identify(drive, cmd, id);
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		/* drive responded with ID */
		rc = 0;
		/* clear drive IRQ */
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		(void)tp_ops->read_status(hwif);
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	} else {
		/* drive refused ID */
		rc = 2;
	}
	return rc;
}

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int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
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{
	u8 stat;

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	timeout += jiffies;

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	do {
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		msleep(50);	/* give drive a breather */
		stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
				 : hwif->tp_ops->read_status(hwif);
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		if ((stat & ATA_BUSY) == 0)
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			return 0;
	} while (time_before(jiffies, timeout));

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	return 1;	/* drive timed-out */
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}
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static u8 ide_read_device(ide_drive_t *drive)
{
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	struct ide_cmd cmd;
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	memset(&cmd, 0, sizeof(cmd));
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	cmd.valid.in.tf = IDE_VALID_DEVICE;
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	drive->hwif->tp_ops->tf_read(drive, &cmd);
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	return cmd.tf.device;
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}

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/**
 *	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)
{
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	ide_hwif_t *hwif = drive->hwif;
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	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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	u16 *id = drive->id;
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	int rc;
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	u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;

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

	/* needed for some systems
	 * (e.g. crw9624 as drive0 with disk as slave)
	 */
	msleep(50);
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	tp_ops->dev_select(drive);
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	msleep(50);
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	if (ide_read_device(drive) != drive->select && present == 0) {
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		if (drive->dn & 1) {
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			/* exit with drive0 selected */
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			tp_ops->dev_select(hwif->devices[0]);
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			/* allow ATA_BUSY to assert & clear */
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			msleep(50);
		}
		/* no i/f present: mmm.. this should be a 4 -ml */
		return 3;
	}

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	stat = tp_ops->read_status(hwif);
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	if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
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	    present || cmd == ATA_CMD_ID_ATAPI) {
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		rc = ide_dev_read_id(drive, cmd, id);
		if (rc)
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			/* failed: try again */
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			rc = ide_dev_read_id(drive, cmd, id);
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		stat = tp_ops->read_status(hwif);
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		if (stat == (ATA_BUSY | ATA_DRDY))
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			return 4;

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		if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
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			printk(KERN_ERR "%s: no response (status = 0x%02x), "
					"resetting drive\n", drive->name, stat);
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			msleep(50);
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			tp_ops->dev_select(drive);
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			msleep(50);
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			tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
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			(void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
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			rc = ide_dev_read_id(drive, cmd, id);
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		}
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		/* ensure drive IRQ is clear */
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		stat = tp_ops->read_status(hwif);
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		if (rc == 1)
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			printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
					drive->name, stat);
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	} else {
		/* not present or maybe ATAPI */
		rc = 3;
	}
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	if (drive->dn & 1) {
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		/* exit with drive0 selected */
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		tp_ops->dev_select(hwif->devices[0]);
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		msleep(50);
		/* ensure drive irq is clear */
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		(void)tp_ops->read_status(hwif);
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	}
	return rc;
}

/**
 *	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
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 *			1  device was found
 *			   (note: IDE_DFLAG_PRESENT might still be not set)
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 */
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static u8 probe_for_drive(ide_drive_t *drive)
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{
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	char *m;
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	int rc;
	u8 cmd;
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	/*
	 *	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"
	 */
 
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	drive->dev_flags &= ~IDE_DFLAG_ID_READ;

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	drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
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	if (drive->id == NULL) {
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		printk(KERN_ERR "ide: out of memory for id data.\n");
		return 0;
	}
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	m = (char *)&drive->id[ATA_ID_PROD];
	strcpy(m, "UNKNOWN");

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	/* skip probing? */
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	if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
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		/* if !(success||timed-out) */
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		cmd = ATA_CMD_ID_ATA;
		rc = do_probe(drive, cmd);
		if (rc >= 2) {
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			/* look for ATAPI device */
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			cmd = ATA_CMD_ID_ATAPI;
			rc = do_probe(drive, cmd);
		}
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		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
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			goto out_free;
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		/* identification failed? */
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		if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
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			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);
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				drive->dev_flags &= ~IDE_DFLAG_PRESENT;
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			}
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		} else {
			if (cmd == ATA_CMD_ID_ATAPI)
				ide_classify_atapi_dev(drive);
			else
				ide_classify_ata_dev(drive);
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		}
	}
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	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
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		goto out_free;
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	/* The drive wasn't being helpful. Add generic info only */
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	if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
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		generic_id(drive);
		return 1;
	}

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

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	return 1;
out_free:
	kfree(drive->id);
	return 0;
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}

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

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	complete(&hwif->gendev_rel_comp);
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}

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static int ide_register_port(ide_hwif_t *hwif)
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{
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	int ret;

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	/* register with global device tree */
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	dev_set_name(&hwif->gendev, hwif->name);
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	hwif->gendev.driver_data = hwif;
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	if (hwif->gendev.parent == NULL)
		hwif->gendev.parent = hwif->dev;
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	hwif->gendev.release = hwif_release_dev;
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	ret = device_register(&hwif->gendev);
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	if (ret < 0) {
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		printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
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			__func__, ret);
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		goto out;
	}

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	hwif->portdev = device_create(ide_port_class, &hwif->gendev,
				      MKDEV(0, 0), hwif, hwif->name);
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	if (IS_ERR(hwif->portdev)) {
		ret = PTR_ERR(hwif->portdev);
		device_unregister(&hwif->gendev);
	}
out:
	return ret;
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}

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/**
 *	ide_port_wait_ready	-	wait for port to become ready
 *	@hwif: IDE port
 *
 *	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-non-busy should not harm any existing
 *	configuration and fix some issues like the above.
 *
 *	BenH.
 *
 *	Returns 0 on success, error code (< 0) otherwise.
 */

static int ide_port_wait_ready(ide_hwif_t *hwif)
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{
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	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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	ide_drive_t *drive;
	int i, rc;
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	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 */
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	ide_port_for_each_dev(i, drive, hwif) {
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		/* Ignore disks that we will not probe for later. */
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		if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
		    (drive->dev_flags & IDE_DFLAG_PRESENT)) {
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			tp_ops->dev_select(drive);
			tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
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			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:
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	/* Exit function with master reselected (let's be sane) */
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	if (i)
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		tp_ops->dev_select(hwif->devices[0]);
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	return rc;
}

/**
 *	ide_undecoded_slave	-	look for bad CF adapters
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 *	@dev1: slave device
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 *
 *	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.
 */

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void ide_undecoded_slave(ide_drive_t *dev1)
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{
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	ide_drive_t *dev0 = dev1->hwif->devices[0];
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	if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
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		return;

	/* If the models don't match they are not the same product */
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	if (strcmp((char *)&dev0->id[ATA_ID_PROD],
		   (char *)&dev1->id[ATA_ID_PROD]))
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		return;

	/* Serial numbers do not match */
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	if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
		    (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
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		return;

	/* No serial number, thankfully very rare for CF */
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	if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
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		return;

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

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	dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
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}

EXPORT_SYMBOL_GPL(ide_undecoded_slave);

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static int ide_probe_port(ide_hwif_t *hwif)
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{
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	ide_drive_t *drive;
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	unsigned int irqd;
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	int i, rc = -ENODEV;
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	BUG_ON(hwif->present);
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	if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
	    (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
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		return -EACCES;
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	/*
	 * 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);

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	if (ide_port_wait_ready(hwif) == -EBUSY)
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		printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);

	/*
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	 * Second drive should only exist if first drive was found,
	 * but a lot of cdrom drives are configured as single slaves.
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	 */
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	ide_port_for_each_dev(i, drive, hwif) {
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		(void) probe_for_drive(drive);
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		if (drive->dev_flags & IDE_DFLAG_PRESENT)
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			rc = 0;
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	}
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	/*
	 * Use cached IRQ number. It might be (and is...) changed by probe
	 * code above
	 */
	if (irqd)
		enable_irq(irqd);

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	return rc;
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}

static void ide_port_tune_devices(ide_hwif_t *hwif)
{
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	const struct ide_port_ops *port_ops = hwif->port_ops;
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	ide_drive_t *drive;
	int i;
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	ide_port_for_each_present_dev(i, drive, hwif) {
		if (port_ops && port_ops->quirkproc)
			port_ops->quirkproc(drive);
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	}
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	ide_port_for_each_present_dev(i, drive, hwif) {
		ide_set_max_pio(drive);
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		drive->dev_flags |= IDE_DFLAG_NICE1;
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		if (hwif->dma_ops)
			ide_set_dma(drive);
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	}
}

/*
 * init request queue
 */
static int ide_init_queue(ide_drive_t *drive)
{
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	struct request_queue *q;
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	ide_hwif_t *hwif = drive->hwif;
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	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.
	 */
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	q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
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	if (!q)
		return 1;

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

	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;
}

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static DEFINE_MUTEX(ide_cfg_mtx);

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/*
 * For any present drive:
 * - allocate the block device queue
 */
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static int ide_port_setup_devices(ide_hwif_t *hwif)
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{
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	ide_drive_t *drive;
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	int i, j = 0;
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	mutex_lock(&ide_cfg_mtx);
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	ide_port_for_each_present_dev(i, drive, hwif) {
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		if (ide_init_queue(drive)) {
			printk(KERN_ERR "ide: failed to init %s\n",
					drive->name);
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			kfree(drive->id);
			drive->id = NULL;
			drive->dev_flags &= ~IDE_DFLAG_PRESENT;
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			continue;
		}

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		j++;
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	}
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	mutex_unlock(&ide_cfg_mtx);
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	return j;
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}

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/*
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 * This routine sets up the IRQ for an IDE interface.
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 */
static int init_irq (ide_hwif_t *hwif)
{
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	struct ide_io_ports *io_ports = &hwif->io_ports;
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	struct ide_host *host = hwif->host;
	irq_handler_t irq_handler = host->irq_handler;
	int sa = host->irq_flags;
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	if (irq_handler == NULL)
		irq_handler = ide_intr;

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	if (io_ports->ctl_addr)
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		hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
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	if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
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		goto out_up;
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#if !defined(__mc68000__)
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	printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
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		io_ports->data_addr, io_ports->status_addr,
		io_ports->ctl_addr, hwif->irq);
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#else
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	printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
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		io_ports->data_addr, hwif->irq);
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#endif /* __mc68000__ */
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	if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
		printk(KERN_CONT " (serialized)");
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	printk(KERN_CONT "\n");
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	return 0;
out_up:
	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;
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	ide_drive_t *drive = hwif->devices[unit];
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	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
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		return NULL;

	if (drive->media == ide_disk)
		request_module("ide-disk");
	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;
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	return &disk_to_dev(p)->kobj;
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}

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;
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	unsigned int unit = drive->dn & 1;
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	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 drive_release_dev (struct device *dev)
{
	ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

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	ide_proc_unregister_device(drive);

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	blk_cleanup_queue(drive->queue);
	drive->queue = NULL;

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	kfree(drive->id);
	drive->id = NULL;
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	drive->dev_flags &= ~IDE_DFLAG_PRESENT;
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	complete(&drive->gendev_rel_comp);
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}

static int hwif_init(ide_hwif_t *hwif)
{
	if (!hwif->irq) {
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		printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
		return 0;
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	}

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

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

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

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	blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
			    THIS_MODULE, ata_probe, ata_lock, hwif);
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	return 1;

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

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

1000
	ide_port_for_each_present_dev(i, drive, hwif) {