libata-core.c 74.6 KB
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/*
   libata-core.c - helper library for ATA

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   Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
   Copyright 2003-2004 Jeff Garzik
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   The contents of this file are subject to the Open
   Software License version 1.1 that can be found at
   http://www.opensource.org/licenses/osl-1.1.txt and is included herein
   by reference.

   Alternatively, the contents of this file may be used under the terms
   of the GNU General Public License version 2 (the "GPL") as distributed
   in the kernel source COPYING file, in which case the provisions of
   the GPL are applicable instead of the above.  If you wish to allow
   the use of your version of this file only under the terms of the
   GPL and not to allow others to use your version of this file under
   the OSL, indicate your decision by deleting the provisions above and
   replace them with the notice and other provisions required by the GPL.
   If you do not delete the provisions above, a recipient may use your
   version of this file under either the OSL or the GPL.

 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
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#include <linux/suspend.h>
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#include <scsi/scsi.h>
#include "scsi.h"
#include "hosts.h"
#include <linux/libata.h>
#include <asm/io.h>
#include <asm/semaphore.h>

#include "libata.h"

static void atapi_cdb_send(struct ata_port *ap);
static unsigned int ata_busy_sleep (struct ata_port *ap,
				    unsigned long tmout_pat,
			    	    unsigned long tmout);
static void __ata_dev_select (struct ata_port *ap, unsigned int device);
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#if 0 /* to be used eventually */
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static void ata_qc_push (struct ata_queued_cmd *qc, unsigned int append);
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#endif
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static void ata_dma_complete(struct ata_port *ap, u8 host_stat,
			     unsigned int done_late);
static void ata_host_set_pio(struct ata_port *ap);
static void ata_host_set_udma(struct ata_port *ap);
static void ata_dev_set_pio(struct ata_port *ap, unsigned int device);
static void ata_dev_set_udma(struct ata_port *ap, unsigned int device);

static unsigned int ata_unique_id = 1;

MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");

static const char * thr_state_name[] = {
	"THR_UNKNOWN",
	"THR_PORT_RESET",
	"THR_AWAIT_DEATH",
	"THR_PROBE_FAILED",
	"THR_IDLE",
	"THR_PROBE_SUCCESS",
	"THR_PROBE_START",
	"THR_PIO_POLL",
	"THR_PIO_TMOUT",
	"THR_PIO",
	"THR_PIO_LAST",
	"THR_PIO_LAST_POLL",
	"THR_PIO_ERR",
	"THR_PACKET",
};

/**
 *	ata_thr_state_name - convert thread state enum to string
 *	@thr_state: thread state to be converted to string
 *
 *	Converts the specified thread state id to a constant C string.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	The THR_xxx-prefixed string naming the specified thread
 *	state id, or the string "<invalid THR_xxx state>".
 */

static const char *ata_thr_state_name(unsigned int thr_state)
{
	if (thr_state < ARRAY_SIZE(thr_state_name))
		return thr_state_name[thr_state];
	return "<invalid THR_xxx state>";
}

/**
 *	msleep - sleep for a number of milliseconds
 *	@msecs: number of milliseconds to sleep
 *
 *	Issues schedule_timeout call for the specified number
 *	of milliseconds.
 *
 *	LOCKING:
 *	None.
 */

static void msleep(unsigned long msecs)
{
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(msecs_to_jiffies(msecs));
}

/**
 *	ata_tf_load_pio - send taskfile registers to host controller
 *	@ioaddr: set of IO ports to which output is sent
 *	@tf: ATA taskfile register set
 *
 *	Outputs ATA taskfile to standard ATA host controller using PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_tf_load_pio(struct ata_port *ap, struct ata_taskfile *tf)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;

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	if (tf->ctl != ap->last_ctl) {
		outb(tf->ctl, ioaddr->ctl_addr);
		ap->last_ctl = tf->ctl;
		ata_wait_idle(ap);
	}
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	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
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		outb(tf->hob_feature, ioaddr->feature_addr);
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		outb(tf->hob_nsect, ioaddr->nsect_addr);
		outb(tf->hob_lbal, ioaddr->lbal_addr);
		outb(tf->hob_lbam, ioaddr->lbam_addr);
		outb(tf->hob_lbah, ioaddr->lbah_addr);
		VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
			tf->hob_feature,
			tf->hob_nsect,
			tf->hob_lbal,
			tf->hob_lbam,
			tf->hob_lbah);
	}

	if (is_addr) {
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		outb(tf->feature, ioaddr->feature_addr);
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		outb(tf->nsect, ioaddr->nsect_addr);
		outb(tf->lbal, ioaddr->lbal_addr);
		outb(tf->lbam, ioaddr->lbam_addr);
		outb(tf->lbah, ioaddr->lbah_addr);
		VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
			tf->feature,
			tf->nsect,
			tf->lbal,
			tf->lbam,
			tf->lbah);
	}

	if (tf->flags & ATA_TFLAG_DEVICE) {
		outb(tf->device, ioaddr->device_addr);
		VPRINTK("device 0x%X\n", tf->device);
	}

	ata_wait_idle(ap);
}

/**
 *	ata_tf_load_mmio - send taskfile registers to host controller
 *	@ioaddr: set of IO ports to which output is sent
 *	@tf: ATA taskfile register set
 *
 *	Outputs ATA taskfile to standard ATA host controller using MMIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_tf_load_mmio(struct ata_port *ap, struct ata_taskfile *tf)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;

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	if (tf->ctl != ap->last_ctl) {
		writeb(tf->ctl, ap->ioaddr.ctl_addr);
		ap->last_ctl = tf->ctl;
		ata_wait_idle(ap);
	}
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	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
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		writeb(tf->hob_feature, (void *) ioaddr->feature_addr);
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		writeb(tf->hob_nsect, (void *) ioaddr->nsect_addr);
		writeb(tf->hob_lbal, (void *) ioaddr->lbal_addr);
		writeb(tf->hob_lbam, (void *) ioaddr->lbam_addr);
		writeb(tf->hob_lbah, (void *) ioaddr->lbah_addr);
		VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
			tf->hob_feature,
			tf->hob_nsect,
			tf->hob_lbal,
			tf->hob_lbam,
			tf->hob_lbah);
	}

	if (is_addr) {
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		writeb(tf->feature, (void *) ioaddr->feature_addr);
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		writeb(tf->nsect, (void *) ioaddr->nsect_addr);
		writeb(tf->lbal, (void *) ioaddr->lbal_addr);
		writeb(tf->lbam, (void *) ioaddr->lbam_addr);
		writeb(tf->lbah, (void *) ioaddr->lbah_addr);
		VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
			tf->feature,
			tf->nsect,
			tf->lbal,
			tf->lbam,
			tf->lbah);
	}

	if (tf->flags & ATA_TFLAG_DEVICE) {
		writeb(tf->device, (void *) ioaddr->device_addr);
		VPRINTK("device 0x%X\n", tf->device);
	}

	ata_wait_idle(ap);
}

/**
 *	ata_exec_command_pio - issue ATA command to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues PIO write to ATA command register, with proper
 *	synchronization with interrupt handler / other threads.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_exec_command_pio(struct ata_port *ap, struct ata_taskfile *tf)
{
	DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);

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       	outb(tf->command, ap->ioaddr.command_addr);
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	ata_pause(ap);
}


/**
 *	ata_exec_command_mmio - issue ATA command to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues MMIO write to ATA command register, with proper
 *	synchronization with interrupt handler / other threads.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_exec_command_mmio(struct ata_port *ap, struct ata_taskfile *tf)
{
	DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);

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       	writeb(tf->command, (void *) ap->ioaddr.command_addr);
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	ata_pause(ap);
}

/**
 *	ata_exec - issue ATA command to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues PIO write to ATA command register, with proper
 *	synchronization with interrupt handler / other threads.
 *
 *	LOCKING:
 *	Obtains host_set lock.
 */

static inline void ata_exec(struct ata_port *ap, struct ata_taskfile *tf)
{
	unsigned long flags;

	DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
	spin_lock_irqsave(&ap->host_set->lock, flags);
	ap->ops->exec_command(ap, tf);
	spin_unlock_irqrestore(&ap->host_set->lock, flags);
}

/**
 *	ata_tf_to_host - issue ATA taskfile to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues ATA taskfile register set to ATA host controller,
 *	via PIO, with proper synchronization with interrupt handler and
 *	other threads.
 *
 *	LOCKING:
 *	Obtains host_set lock.
 */

static void ata_tf_to_host(struct ata_port *ap, struct ata_taskfile *tf)
{
	init_MUTEX_LOCKED(&ap->sem);

	ap->ops->tf_load(ap, tf);

	ata_exec(ap, tf);
}

/**
 *	ata_tf_to_host_nolock - issue ATA taskfile to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues ATA taskfile register set to ATA host controller,
 *	via PIO, with proper synchronization with interrupt handler and
 *	other threads.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_tf_to_host_nolock(struct ata_port *ap, struct ata_taskfile *tf)
{
	init_MUTEX_LOCKED(&ap->sem);

	ap->ops->tf_load(ap, tf);
	ap->ops->exec_command(ap, tf);
}

/**
 *	ata_tf_read_pio - input device's ATA taskfile shadow registers
 *	@ioaddr: set of IO ports from which input is read
 *	@tf: ATA taskfile register set for storing input
 *
 *	Reads ATA taskfile registers for currently-selected device
 *	into @tf via PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	tf->nsect = inb(ioaddr->nsect_addr);
	tf->lbal = inb(ioaddr->lbal_addr);
	tf->lbam = inb(ioaddr->lbam_addr);
	tf->lbah = inb(ioaddr->lbah_addr);
	tf->device = inb(ioaddr->device_addr);

	if (tf->flags & ATA_TFLAG_LBA48) {
		outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
		tf->hob_feature = inb(ioaddr->error_addr);
		tf->hob_nsect = inb(ioaddr->nsect_addr);
		tf->hob_lbal = inb(ioaddr->lbal_addr);
		tf->hob_lbam = inb(ioaddr->lbam_addr);
		tf->hob_lbah = inb(ioaddr->lbah_addr);
	}
}

/**
 *	ata_tf_read_mmio - input device's ATA taskfile shadow registers
 *	@ioaddr: set of IO ports from which input is read
 *	@tf: ATA taskfile register set for storing input
 *
 *	Reads ATA taskfile registers for currently-selected device
 *	into @tf via MMIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	tf->nsect = readb((void *)ioaddr->nsect_addr);
	tf->lbal = readb((void *)ioaddr->lbal_addr);
	tf->lbam = readb((void *)ioaddr->lbam_addr);
	tf->lbah = readb((void *)ioaddr->lbah_addr);
	tf->device = readb((void *)ioaddr->device_addr);

	if (tf->flags & ATA_TFLAG_LBA48) {
		writeb(tf->ctl | ATA_HOB, ap->ioaddr.ctl_addr);
		tf->hob_feature = readb((void *)ioaddr->error_addr);
		tf->hob_nsect = readb((void *)ioaddr->nsect_addr);
		tf->hob_lbal = readb((void *)ioaddr->lbal_addr);
		tf->hob_lbam = readb((void *)ioaddr->lbam_addr);
		tf->hob_lbah = readb((void *)ioaddr->lbah_addr);
	}
}

/**
 *	ata_check_status_pio - Read device status reg & clear interrupt
 *	@ap: port where the device is
 *
 *	Reads ATA taskfile status register for currently-selected device
 *	via PIO and return it's value. This also clears pending interrupts
 *      from this device
 *
 *	LOCKING:
 *	Inherited from caller.
 */
u8 ata_check_status_pio(struct ata_port *ap)
{
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	return inb(ap->ioaddr.status_addr);
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}

/**
 *	ata_check_status_mmio - Read device status reg & clear interrupt
 *	@ap: port where the device is
 *
 *	Reads ATA taskfile status register for currently-selected device
 *	via MMIO and return it's value. This also clears pending interrupts
 *      from this device
 *
 *	LOCKING:
 *	Inherited from caller.
 */
u8 ata_check_status_mmio(struct ata_port *ap)
{
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       	return readb((void *) ap->ioaddr.status_addr);
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}

static const char * udma_str[] = {
	"UDMA/16",
	"UDMA/25",
	"UDMA/33",
	"UDMA/44",
	"UDMA/66",
	"UDMA/100",
	"UDMA/133",
	"UDMA7",
};

/**
 *	ata_udma_string - convert UDMA bit offset to string
 *	@udma_mask: mask of bits supported; only highest bit counts.
 *
 *	Determine string which represents the highest speed
 *	(highest bit in @udma_mask).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
 *	@udma_mask, or the constant C string "<n/a>".
 */

static const char *ata_udma_string(unsigned int udma_mask)
{
	int i;

	for (i = 7; i >= 0; i--) {
		if (udma_mask & (1 << i))
			return udma_str[i];
	}

	return "<n/a>";
}

/**
 *	ata_pio_devchk -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 *
 */

static unsigned int ata_pio_devchk(struct ata_port *ap,
				   unsigned int device)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	__ata_dev_select(ap, device);

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	outb(0xaa, ioaddr->nsect_addr);
	outb(0x55, ioaddr->lbal_addr);

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	nsect = inb(ioaddr->nsect_addr);
	lbal = inb(ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_mmio_devchk -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 *
 */

static unsigned int ata_mmio_devchk(struct ata_port *ap,
				    unsigned int device)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	__ata_dev_select(ap, device);

	writeb(0x55, (void *) ioaddr->nsect_addr);
	writeb(0xaa, (void *) ioaddr->lbal_addr);

	writeb(0xaa, (void *) ioaddr->nsect_addr);
	writeb(0x55, (void *) ioaddr->lbal_addr);

	writeb(0x55, (void *) ioaddr->nsect_addr);
	writeb(0xaa, (void *) ioaddr->lbal_addr);

	nsect = readb((void *) ioaddr->nsect_addr);
	lbal = readb((void *) ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_dev_devchk -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 *
 */

static unsigned int ata_dev_devchk(struct ata_port *ap,
				    unsigned int device)
{
	if (ap->flags & ATA_FLAG_MMIO)
		return ata_mmio_devchk(ap, device);
	return ata_pio_devchk(ap, device);
}

/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
 *	the event of failure.
 */

static unsigned int ata_dev_classify(struct ata_taskfile *tf)
{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
	 */

	if (((tf->lbam == 0) && (tf->lbah == 0)) ||
	    ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

	if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
	    ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 *
 */

static u8 ata_dev_try_classify(struct ata_port *ap, unsigned int device,
			       unsigned int maybe_have_dev)
{
	struct ata_device *dev = &ap->device[device];
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

	__ata_dev_select(ap, device);

	memset(&tf, 0, sizeof(tf));

	err = ata_chk_err(ap);
	ap->ops->tf_read(ap, &tf);

	dev->class = ATA_DEV_NONE;

	/* see if device passed diags */
	if (err == 1)
		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
		return err;

	/* determine if device if ATA or ATAPI */
	class = ata_dev_classify(&tf);
	if (class == ATA_DEV_UNKNOWN)
		return err;
	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
		return err;

	dev->class = class;

	return err;
}

/**
 *	ata_dev_id_string -
 *	@dev:
 *	@s:
 *	@ofs:
 *	@len:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

unsigned int ata_dev_id_string(struct ata_device *dev, unsigned char *s,
			       unsigned int ofs, unsigned int len)
{
	unsigned int c, ret = 0;

	while (len > 0) {
		c = dev->id[ofs] >> 8;
		*s = c;
		s++;

		ret = c = dev->id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}

	return ret;
}

/**
 *	ata_dev_parse_strings -
 *	@dev:
 *
 *	LOCKING:
 */

static void ata_dev_parse_strings(struct ata_device *dev)
{
	assert (dev->class == ATA_DEV_ATA);
	memcpy(dev->vendor, "ATA     ", 8);

	ata_dev_id_string(dev, dev->product, ATA_ID_PROD_OFS,
			  sizeof(dev->product));
}

/**
 *	__ata_dev_select -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 *
 */

static void __ata_dev_select (struct ata_port *ap, unsigned int device)
{
	u8 tmp;

	if (device == 0)
		tmp = ATA_DEVICE_OBS;
	else
		tmp = ATA_DEVICE_OBS | ATA_DEV1;

	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(tmp, (void *) ap->ioaddr.device_addr);
	} else {
		outb(tmp, ap->ioaddr.device_addr);
	}
	ata_pause(ap);		/* needed; also flushes, for mmio */
}

/**
 *	ata_dev_select -
 *	@ap:
 *	@device:
 *	@wait:
 *	@can_sleep:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
	VPRINTK("ENTER, ata%u: device %u, wait %u\n",
		ap->id, device, wait);

	if (wait)
		ata_wait_idle(ap);

	__ata_dev_select(ap, device);

	if (wait) {
		if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id -
 *	@dev:
 *
 *	LOCKING:
 */

static inline void ata_dump_id(struct ata_device *dev)
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
		dev->id[49],
		dev->id[53],
		dev->id[63],
		dev->id[64],
		dev->id[75]);
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
		dev->id[80],
		dev->id[81],
		dev->id[82],
		dev->id[83],
		dev->id[84]);
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
		dev->id[88],
		dev->id[93]);
}

/**
 *	ata_dev_identify - obtain IDENTIFY x DEVICE page
 *	@ap: port on which device we wish to probe resides
 *	@device: device bus address, starting at zero
 *
 *	Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
 *	command, and read back the 512-byte device information page.
 *	The device information page is fed to us via the standard
 *	PIO-IN protocol, but we hand-code it here. (TODO: investigate
 *	using standard PIO-IN paths)
 *
 *	After reading the device information page, we use several
 *	bits of information from it to initialize data structures
 *	that will be used during the lifetime of the ata_device.
 *	Other data from the info page is used to disqualify certain
 *	older ATA devices we do not wish to support.
 *
 *	LOCKING:
 *	Inherited from caller.  Some functions called by this function
 *	obtain the host_set lock.
 */

static void ata_dev_identify(struct ata_port *ap, unsigned int device)
{
	struct ata_device *dev = &ap->device[device];
	unsigned int i;
	u16 tmp, udma_modes;
	u8 status;
	struct ata_taskfile tf;
	unsigned int using_edd;

	if (!ata_dev_present(dev)) {
		DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
			ap->id, device);
		return;
	}

	if (ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
		using_edd = 0;
	else
		using_edd = 1;

	DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);

	assert (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ATAPI ||
		dev->class == ATA_DEV_NONE);

	ata_dev_select(ap, device, 1, 1); /* select device 0/1 */

retry:
	ata_tf_init(ap, &tf, device);
	tf.ctl |= ATA_NIEN;
	tf.protocol = ATA_PROT_PIO_READ;

	if (dev->class == ATA_DEV_ATA) {
		tf.command = ATA_CMD_ID_ATA;
		DPRINTK("do ATA identify\n");
	} else {
		tf.command = ATA_CMD_ID_ATAPI;
		DPRINTK("do ATAPI identify\n");
	}

	ata_tf_to_host(ap, &tf);

	/* crazy ATAPI devices... */
	if (dev->class == ATA_DEV_ATAPI)
		msleep(150);

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT))
		goto err_out;

	status = ata_chk_status(ap);
	if (status & ATA_ERR) {
		/*
		 * arg!  EDD works for all test cases, but seems to return
		 * the ATA signature for some ATAPI devices.  Until the
		 * reason for this is found and fixed, we fix up the mess
		 * here.  If IDENTIFY DEVICE returns command aborted
		 * (as ATAPI devices do), then we issue an
		 * IDENTIFY PACKET DEVICE.
		 *
		 * ATA software reset (SRST, the default) does not appear
		 * to have this problem.
		 */
		if ((using_edd) && (tf.command == ATA_CMD_ID_ATA)) {
			u8 err = ata_chk_err(ap);
			if (err & ATA_ABORTED) {
				dev->class = ATA_DEV_ATAPI;
				goto retry;
			}
		}
		goto err_out;
	}

	/* make sure we have BSY=0, DRQ=1 */
	if ((status & ATA_DRQ) == 0) {
		printk(KERN_WARNING "ata%u: dev %u (ATA%s?) not returning id page (0x%x)\n",
		       ap->id, device,
		       dev->class == ATA_DEV_ATA ? "" : "PI",
		       status);
		goto err_out;
	}

	/* read IDENTIFY [X] DEVICE page */
	if (ap->flags & ATA_FLAG_MMIO) {
		for (i = 0; i < ATA_ID_WORDS; i++)
			dev->id[i] = readw((void *)ap->ioaddr.data_addr);
	} else
		for (i = 0; i < ATA_ID_WORDS; i++)
			dev->id[i] = inw(ap->ioaddr.data_addr);

	/* wait for host_idle */
	status = ata_wait_idle(ap);
	if (status & (ATA_BUSY | ATA_DRQ)) {
		printk(KERN_WARNING "ata%u: dev %u (ATA%s?) error after id page (0x%x)\n",
		       ap->id, device,
		       dev->class == ATA_DEV_ATA ? "" : "PI",
		       status);
		goto err_out;
	}

	ata_irq_on(ap);	/* re-enable interrupts */

	/* print device capabilities */
	printk(KERN_DEBUG "ata%u: dev %u cfg "
	       "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
	       ap->id, device, dev->id[49],
	       dev->id[82], dev->id[83], dev->id[84],
	       dev->id[85], dev->id[86], dev->id[87],
	       dev->id[88]);

	/*
	 * common ATA, ATAPI feature tests
	 */

	/* we require LBA and DMA support (bits 8 & 9 of word 49) */
	if (!ata_id_has_dma(dev) || !ata_id_has_lba(dev)) {
		printk(KERN_DEBUG "ata%u: no dma/lba\n", ap->id);
		goto err_out_nosup;
	}

	/* we require UDMA support */
	udma_modes =
	tmp = dev->id[ATA_ID_UDMA_MODES];
	if ((tmp & 0xff) == 0) {
		printk(KERN_DEBUG "ata%u: no udma\n", ap->id);
		goto err_out_nosup;
	}

	ata_dump_id(dev);

	ata_dev_parse_strings(dev);

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(dev))	/* sanity check */
			goto err_out_nosup;

		tmp = dev->id[ATA_ID_MAJOR_VER];
		for (i = 14; i >= 1; i--)
			if (tmp & (1 << i))
				break;

		/* we require at least ATA-3 */
		if (i < 3) {
			printk(KERN_DEBUG "ata%u: no ATA-3\n", ap->id);
			goto err_out_nosup;
		}

		if (ata_id_has_lba48(dev)) {
			dev->flags |= ATA_DFLAG_LBA48;
			dev->n_sectors = ata_id_u64(dev, 100);
		} else {
			dev->n_sectors = ata_id_u32(dev, 60);
		}

		ap->host->max_cmd_len = 16;

		/* print device info to dmesg */
		printk(KERN_INFO "ata%u: dev %u ATA, max %s, %Lu sectors%s\n",
		       ap->id, device,
		       ata_udma_string(udma_modes),
Andrew Morton's avatar
Andrew Morton committed
975
		       (unsigned long long)dev->n_sectors,
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		       dev->flags & ATA_DFLAG_LBA48 ? " (lba48)" : "");
	}

	/* ATAPI-specific feature tests */
	else {
		if (ata_id_is_ata(dev))		/* sanity check */
			goto err_out_nosup;

		/* see if 16-byte commands supported */
		tmp = dev->id[0] & 0x3;
		if (tmp == 1)
			ap->host->max_cmd_len = 16;

		/* print device info to dmesg */
		printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
		       ap->id, device,
		       ata_udma_string(udma_modes));
	}

	DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
	return;

err_out_nosup:
	printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
	       ap->id, device);
err_out:
	ata_irq_on(ap);	/* re-enable interrupts */
	dev->class++;	/* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
	DPRINTK("EXIT, err\n");
}

/**
 *	ata_port_reset -
 *	@ap:
 *
 *	LOCKING:
 */

static void ata_port_reset(struct ata_port *ap)
{
	unsigned int i, found = 0;

	ap->ops->phy_reset(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		goto err_out;

	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		ata_dev_identify(ap, i);
		if (ata_dev_present(&ap->device[i])) {
			found = 1;
			if (ap->ops->dev_config)
				ap->ops->dev_config(ap, &ap->device[i]);
		}
	}

	if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
		goto err_out_disable;

	ap->ops->phy_config(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		goto err_out_disable;

	ap->thr_state = THR_PROBE_SUCCESS;

	return;

err_out_disable:
	ap->ops->port_disable(ap);
err_out:
	ap->thr_state = THR_PROBE_FAILED;
}

/**
 *	ata_port_probe -
 *	@ap:
 *
 *	LOCKING:
 */

void ata_port_probe(struct ata_port *ap)
{
	ap->flags &= ~ATA_FLAG_PORT_DISABLED;
}

/**
 *	sata_phy_reset -
 *	@ap:
 *
 *	LOCKING:
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

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	if (ap->flags & ATA_FLAG_SATA_RESET) {
		scr_write(ap, SCR_CONTROL, 0x301); /* issue phy wake/reset */
		scr_read(ap, SCR_STATUS);	/* dummy read; flush */
		udelay(400);			/* FIXME: a guess */
	}
	scr_write(ap, SCR_CONTROL, 0x300);	/* issue phy wake/clear reset */
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	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
		sstatus = scr_read(ap, SCR_STATUS);
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

	/* TODO: phy layer with polling, timeouts, etc. */
	if (sata_dev_present(ap))
		ata_port_probe(ap);
	else {
		sstatus = scr_read(ap, SCR_STATUS);
		printk(KERN_INFO "ata%u: no device found (phy stat %08x)\n",
		       ap->id, sstatus);
		ata_port_disable(ap);
	}

	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

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	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
		ata_port_disable(ap);
		return;
	}

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	ata_bus_reset(ap);
}

/**
 *	ata_port_disable -
 *	@ap:
 *
 *	LOCKING:
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
	ap->flags |= ATA_FLAG_PORT_DISABLED;
}

/**
 *	pata_phy_config -
 *	@ap:
 *
 *	LOCKING:
 *
 */
void pata_phy_config(struct ata_port *ap)
{
	unsigned int force_pio;

	ata_host_set_pio(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

	ata_host_set_udma(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

#ifdef ATA_FORCE_PIO
	force_pio = 1;
#else
	force_pio = 0;
#endif

	if (force_pio) {
		ata_dev_set_pio(ap, 0);
		ata_dev_set_pio(ap, 1);

		if (ap->flags & ATA_FLAG_PORT_DISABLED)
			return;
	} else {
		ata_dev_set_udma(ap, 0);
		ata_dev_set_udma(ap, 1);

		if (ap->flags & ATA_FLAG_PORT_DISABLED)
			return;
	}

}

/**
 *	ata_busy_sleep - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@tmout_pat: impatience timeout
 *	@tmout: overall timeout
 *
 *	LOCKING:
 *
 */

static unsigned int ata_busy_sleep (struct ata_port *ap,
				    unsigned long tmout_pat,
			    	    unsigned long tmout)
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

	if (status & ATA_BUSY)
		printk(KERN_WARNING "ata%u is slow to respond, "
		       "please be patient\n", ap->id);

	timeout = timer_start + tmout;
	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
		msleep(50);
		status = ata_chk_status(ap);
	}

	if (status & ATA_BUSY) {
		printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
		       ap->id, tmout / HZ);
		return 1;
	}

	return 0;
}

static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
	unsigned long timeout;

	/* if device 0 was found in ata_dev_devchk, wait for its
	 * BSY bit to clear
	 */
	if (dev0)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* if device 1 was found in ata_dev_devchk, wait for
	 * register access, then wait for BSY to clear
	 */
	timeout = jiffies + ATA_TMOUT_BOOT;
	while (dev1) {
		u8 nsect, lbal;

		__ata_dev_select(ap, 1);
		if (ap->flags & ATA_FLAG_MMIO) {
			nsect = readb((void *) ioaddr->nsect_addr);
			lbal = readb((void *) ioaddr->lbal_addr);
		} else {
			nsect = inb(ioaddr->nsect_addr);
			lbal = inb(ioaddr->lbal_addr);
		}
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* is all this really necessary? */
	__ata_dev_select(ap, 0);
	if (dev1)
		__ata_dev_select(ap, 1);
	if (dev0)
		__ata_dev_select(ap, 0);
}

/**
 *	ata_bus_edd -
 *	@ap:
 *
 *	LOCKING:
 *
 */

static unsigned int ata_bus_edd(struct ata_port *ap)
{
	struct ata_taskfile tf;

	/* set up execute-device-diag (bus reset) taskfile */
	/* also, take interrupts to a known state (disabled) */
	DPRINTK("execute-device-diag\n");
	ata_tf_init(ap, &tf, 0);
	tf.ctl |= ATA_NIEN;
	tf.command = ATA_CMD_EDD;
	tf.protocol = ATA_PROT_NODATA;

	/* do bus reset */
	ata_tf_to_host(ap, &tf);

	/* spec says at least 2ms.  but who knows with those
	 * crazy ATAPI devices...
	 */
	msleep(150);

	return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
}

static unsigned int ata_bus_softreset(struct ata_port *ap,
				      unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	DPRINTK("ata%u: bus reset via SRST\n", ap->id);

	/* software reset.  causes dev0 to be selected */
	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(ap->ctl, ioaddr->ctl_addr);
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		udelay(20);	/* FIXME: flush */
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		writeb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
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		udelay(20);	/* FIXME: flush */
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		writeb(ap->ctl, ioaddr->ctl_addr);
	} else {
		outb(ap->ctl, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl, ioaddr->ctl_addr);
	}

	/* spec mandates ">= 2ms" before checking status.
	 * We wait 150ms, because that was the magic delay used for
	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
	 * between when the ATA command register is written, and then
	 * status is checked.  Because waiting for "a while" before
	 * checking status is fine, post SRST, we perform this magic
	 * delay here as well.
	 */
	msleep(150);

	ata_bus_post_reset(ap, devmask);

	return 0;
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
 *	Inherited from caller.  Some functions called by this function
 *	obtain the host_set lock.
 *
 *	SIDE EFFECTS:
 *	Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
 */

void ata_bus_reset(struct ata_port *ap)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
	unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;

	DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);

	/* determine if device 0/1 are present */
1352 1353 1354 1355 1356 1357 1358
	if (ap->flags & ATA_FLAG_SATA_RESET)
		dev0 = 1;
	else {
		dev0 = ata_dev_devchk(ap, 0);
		if (slave_possible)
			dev1 = ata_dev_devchk(ap, 1);
	}
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370

	if (dev0)
		devmask |= (1 << 0);
	if (dev1)
		devmask |= (1 << 1);

	/* select device 0 again */
	__ata_dev_select(ap, 0);

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
		rc = ata_bus_softreset(ap, devmask);
1371 1372 1373 1374 1375 1376
	else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
		/* set up device control */
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, ioaddr->ctl_addr);
		else
			outb(ap->ctl, ioaddr->ctl_addr);
1377
		rc = ata_bus_edd(ap);
1378
	}
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403

	if (rc)
		goto err_out;

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
	err = ata_dev_try_classify(ap, 0, dev0);
	if ((slave_possible) && (err != 0x81))
		ata_dev_try_classify(ap, 1, dev1);

	/* re-enable interrupts */
	ata_irq_on(ap);

	/* is double-select really necessary? */
	if (ap->device[1].class != ATA_DEV_NONE)
		__ata_dev_select(ap, 1);
	if (ap->device[0].class != ATA_DEV_NONE)
		__ata_dev_select(ap, 0);

	/* if no devices were detected, disable this port */
	if ((ap->device[0].class == ATA_DEV_NONE) &&
	    (ap->device[1].class == ATA_DEV_NONE))
		goto err_out;

1404 1405 1406 1407 1408 1409 1410 1411
	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, ioaddr->ctl_addr);
		else
			outb(ap->ctl, ioaddr->ctl_addr);
	}

1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	DPRINTK("EXIT\n");
	return;

err_out:
	printk(KERN_ERR "ata%u: disabling port\n", ap->id);
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

/**
 *	ata_host_set_pio -
 *	@ap:
 *
 *	LOCKING:
 */

static void ata_host_set_pio(struct ata_port *ap)
{
	struct ata_device *master, *slave;
	unsigned int pio, i;
	u16 mask;

	master = &ap->device[0];
	slave = &ap->device[1];

	assert (ata_dev_present(master) || ata_dev_present(slave));

	mask = ap->pio_mask;
	if (ata_dev_present(master))
		mask &= (master->id[ATA_ID_PIO_MODES] & 0x03);
	if (ata_dev_present(slave))
		mask &= (slave->id[ATA_ID_PIO_MODES] & 0x03);

	/* require pio mode 3 or 4 support for host and all devices */
	if (mask == 0) {
		printk(KERN_WARNING "ata%u: no PIO3/4 support, ignoring\n",
		       ap->id);
		goto err_out;
	}

	pio = (mask & ATA_ID_PIO4) ? 4 : 3;
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_present(&ap->device[i])) {
			ap->device[i].pio_mode = (pio == 3) ?
				XFER_PIO_3 : XFER_PIO_4;
1458 1459
			if (ap->ops->set_piomode)
				ap->ops->set_piomode(ap, &ap->device[i], pio);
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
		}

	return;

err_out:
	ap->ops->port_disable(ap);
}

/**
 *	ata_host_set_udma -
 *	@ap:
 *
 *	LOCKING:
 */

static void ata_host_set_udma(struct ata_port *ap)
{
	struct ata_device *master, *slave;
	u16 mask;
	unsigned int i, j;
	int udma_mode = -1;

	master = &ap->device[0];
	slave = &ap->device[1];

	assert (ata_dev_present(master) || ata_dev_present(slave));
	assert ((ap->flags & ATA_FLAG_PORT_DISABLED) == 0);

	DPRINTK("udma masks: host 0x%X, master 0x%X, slave 0x%X\n",
		ap->udma_mask,
		(!ata_dev_present(master)) ? 0xff :
			(master->id[ATA_ID_UDMA_MODES] & 0xff),
		(!ata_dev_present(slave)) ? 0xff :
			(slave->id[ATA_ID_UDMA_MODES] & 0xff));

	mask = ap->udma_mask;
	if (ata_dev_present(master))
		mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
	if (ata_dev_present(slave))
		mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);

	i = XFER_UDMA_7;
	while (i >= XFER_UDMA_0) {
		j = i - XFER_UDMA_0;
		DPRINTK("mask 0x%X i 0x%X j %u\n", mask, i, j);
		if (mask & (1 << j)) {
			udma_mode = i;
			break;
		}

		i--;
	}

	/* require udma for host and all attached devices */
	if (udma_mode < 0) {
		printk(KERN_WARNING "ata%u: no UltraDMA support, ignoring\n",
		       ap->id);
		goto err_out;
	}

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_present(&ap->device[i])) {
			ap->device[i].udma_mode = udma_mode;
1523 1524 1525
			if (ap->ops->set_udmamode)
				ap->ops->set_udmamode(ap, &ap->device[i],
						      udma_mode);
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
		}

	return;

err_out:
	ap->ops->port_disable(ap);
}

/**
 *	ata_dev_set_xfermode -
 *	@ap:
 *	@dev:
 *
 *	LOCKING:
 */

static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
{
	struct ata_taskfile tf;

	/* set up set-features taskfile */
	DPRINTK("set features - xfer mode\n");
	ata_tf_init(ap, &tf, dev->devno);
	tf.ctl |= ATA_NIEN;
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	if (dev->flags & ATA_DFLAG_PIO)
		tf.nsect = dev->pio_mode;
	else
		tf.nsect = dev->udma_mode;

	/* do bus reset */
	ata_tf_to_host(ap, &tf);

	/* crazy ATAPI devices... */
	if (dev->class == ATA_DEV_ATAPI)
		msleep(150);

	ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	ata_irq_on(ap);	/* re-enable interrupts */

	ata_wait_idle(ap);

	DPRINTK("EXIT\n");
}

/**
 *	ata_dev_set_udma -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 */

static void ata_dev_set_udma(struct ata_port *ap, unsigned int device)
{
	struct ata_device *dev = &ap->device[device];

	if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
		return;

	ata_dev_set_xfermode(ap, dev);

	assert((dev->udma_mode >= XFER_UDMA_0) &&
	       (dev->udma_mode <= XFER_UDMA_7));
	printk(KERN_INFO "ata%u: dev %u configured for %s\n",
	       ap->id, device,
	       udma_str[dev->udma_mode - XFER_UDMA_0]);
}

/**
 *	ata_dev_set_pio -
 *	@ap:
 *	@device:
 *
 *	LOCKING:
 */

static void ata_dev_set_pio(struct ata_port *ap, unsigned int device)
{
	struct ata_device *dev = &ap->device[device];

	if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
		return;

	/* force PIO mode */
	dev->flags |= ATA_DFLAG_PIO;

	ata_dev_set_xfermode(ap, dev);

	assert((dev->pio_mode >= XFER_PIO_3) &&
	       (dev->pio_mode <= XFER_PIO_4));
	printk(KERN_INFO "ata%u: dev %u configured for PIO%c\n",
	       ap->id, device,
	       dev->pio_mode == 3 ? '3' : '4');
}

/**
 *	ata_sg_clean -
 *	@qc:
 *
 *	LOCKING:
 */

static void ata_sg_clean(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
1636
	struct scsi_cmnd *cmd = qc->scsicmd;
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	struct scatterlist *sg = qc->sg;
	int dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);

	assert(dir == SCSI_DATA_READ || dir == SCSI_DATA_WRITE);
	assert(qc->flags & ATA_QCFLAG_SG);
	assert(sg != NULL);

	if (!cmd->use_sg)
		assert(qc->n_elem == 1);

	DPRINTK("unmapping %u sg elements\n", qc->n_elem);

	if (cmd->use_sg)
		pci_unmap_sg(ap->host_set->pdev, sg, qc->n_elem, dir);
	else
1652 1653
		pci_unmap_single(ap->host_set->pdev, sg_dma_address(&sg[0]),
				 sg_dma_len(&sg[0]), dir);
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669

	qc->flags &= ~ATA_QCFLAG_SG;
	qc->sg = NULL;
}

/**
 *	ata_fill_sg -
 *	@qc:
 *
 *	LOCKING:
 *
 */
void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct scatterlist *sg = qc->sg;
	struct ata_port *ap = qc->ap;
1670
	unsigned int idx, nelem;
1671 1672 1673 1674

	assert(sg != NULL);
	assert(qc->n_elem > 0);

1675
	idx = 0;
1676
	for (nelem = qc->n_elem; nelem; nelem--,sg++) {
1677
		u32 addr, boundary;
1678
		u32 sg_len, len;
1679 1680 1681 1682 1683

		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
1684 1685
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);
1686

1687 1688 1689 1690 1691
		while (sg_len) {
			boundary = (addr & ~0xffff) + (0xffff + 1);
			len = sg_len;
			if ((addr + sg_len) > boundary)
				len = boundary - addr;
1692 1693

			ap->prd[idx].addr = cpu_to_le32(addr);
1694 1695 1696
			ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

1697
			idx++;
1698 1699
			sg_len -= len;
			addr += len;
1700
		}
1701
	}
1702

1703 1704
	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
}

/**
 *	ata_sg_setup_one -
 *	@qc:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
1721
	struct scsi_cmnd *cmd = qc->scsicmd;
1722 1723 1724 1725 1726 1727 1728 1729 1730
	int dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);
	struct scatterlist *sg = qc->sg;
	unsigned int have_sg = (qc->flags & ATA_QCFLAG_SG);

	assert(sg == &qc->sgent);
	assert(qc->n_elem == 1);

	sg->page = virt_to_page(cmd->request_buffer);
	sg->offset = (unsigned long) cmd->request_buffer & ~PAGE_MASK;
1731
	sg_dma_len(sg) = cmd->request_bufflen;
1732 1733 1734 1735

	if (!have_sg)
		return 0;

1736
	sg_dma_address(sg) = pci_map_single(ap->host_set->pdev,
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
					 cmd->request_buffer,
					 cmd->request_bufflen, dir);

	DPRINTK("mapped buffer of %d bytes for %s\n", cmd->request_bufflen,
		qc->flags & ATA_QCFLAG_WRITE ? "write" : "read");

	return 0;
}

/**
 *	ata_sg_setup -
 *	@qc:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
1760
	struct scsi_cmnd *cmd = qc->scsicmd;
1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	struct scatterlist *sg;
	int n_elem;
	unsigned int have_sg = (qc->flags & ATA_QCFLAG_SG);

	VPRINTK("ENTER, ata%u, use_sg %d\n", ap->id, cmd->use_sg);
	assert(cmd->use_sg > 0);

	sg = (struct scatterlist *)cmd->request_buffer;
	if (have_sg) {
		int dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);
		n_elem = pci_map_sg(ap->host_set->pdev, sg, cmd->use_sg, dir);
		if (n_elem < 1)
			return -1;
		DPRINTK("%d sg elements mapped\n", n_elem);
	} else {
		n_elem = cmd->use_sg;
	}
	qc->n_elem = n_elem;

	return 0;
}

/**
 *	ata_pio_poll -
 *	@ap:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

static unsigned long ata_pio_poll(struct ata_port *ap)
{
	u8 status;
	unsigned int poll_state = THR_UNKNOWN;
	unsigned int reg_state = THR_UNKNOWN;
	const unsigned int tmout_state = THR_PIO_TMOUT;

	switch (ap->thr_state) {
	case THR_PIO:
	case THR_PIO_POLL:
		poll_state = THR_PIO_POLL;
		reg_state = THR_PIO;
		break;
	case THR_PIO_LAST:
	case THR_PIO_LAST_POLL:
		poll_state = THR_PIO_LAST_POLL;
		reg_state = THR_PIO_LAST;
		break;
	default:
		BUG();
		break;
	}

	status = ata_chk_status(ap);
	if (status & ATA_BUSY) {
		if (time_after(jiffies, ap->thr_timeout)) {
			ap->thr_state = tmout_state;
			return 0;
		}
		ap->thr_state = poll_state;
		return ATA_SHORT_PAUSE;
	}

	ap->thr_state = reg_state;
	return 0;
}

/**
 *	ata_pio_start -
 *	@qc:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_pio_start (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	assert((qc->tf.protocol == ATA_PROT_PIO_READ) ||
	       (qc->tf.protocol == ATA_PROT_PIO_WRITE));

	qc->flags |= ATA_QCFLAG_POLL;
	qc->tf.ctl |= ATA_NIEN;	/* disable interrupts */
	ata_tf_to_host_nolock(ap, &qc->tf);
	ata_thread_wake(ap, THR_PIO);
}

/**
 *	ata_pio_complete -
 *	@ap:
 *
 *	LOCKING:
 */

static void ata_pio_complete (struct ata_port *ap)
{
	struct ata_queued_cmd *qc;
	unsigned long flags;
	u8 drv_stat;

	/*
	 * This is purely hueristic.  This is a fast path.
	 * Sometimes when we enter, BSY will be cleared in
	 * a chk-status or two.  If not, the drive is probably seeking
	 * or something.  Snooze for a couple msecs, then
	 * chk-status again.  If still busy, fall back to
	 * THR_PIO_POLL state.
	 */
	drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 10);
	if (drv_stat & (ATA_BUSY | ATA_DRQ)) {
		msleep(2);
		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 10);
		if (drv_stat & (ATA_BUSY | ATA_DRQ)) {
			ap->thr_state = THR_PIO_LAST_POLL;
			ap->thr_timeout = jiffies + ATA_TMOUT_PIO;
			return;
		}
	}

	drv_stat = ata_wait_idle(ap);
	if (drv_stat & (ATA_BUSY | ATA_DRQ)) {
		ap->thr_state = THR_PIO_ERR;
		return;
	}

	qc = ata_qc_from_tag(ap, ap->active_tag);
	assert(qc != NULL);

	spin_lock_irqsave(&ap->host_set->lock, flags);
	ap->thr_state = THR_IDLE;
	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	ata_irq_on(ap);

	ata_qc_complete(qc, drv_stat, 0);
}

/**
 *	ata_pio_sector -
 *	@ap:
 *
 *	LOCKING:
 */

static void ata_pio_sector(struct ata_port *ap)
{
	struct ata_queued_cmd *qc;
	struct scatterlist *sg;
1912
	struct scsi_cmnd *cmd;
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956
	unsigned char *buf;
	u8 status;

	/*
	 * This is purely hueristic.  This is a fast path.
	 * Sometimes when we enter, BSY will be cleared in
	 * a chk-status or two.  If not, the drive is probably seeking
	 * or something.  Snooze for a couple msecs, then
	 * chk-status again.  If still busy, fall back to
	 * THR_PIO_POLL state.
	 */
	status = ata_busy_wait(ap, ATA_BUSY, 5);
	if (status & ATA_BUSY) {
		msleep(2);
		status = ata_busy_wait(ap, ATA_BUSY, 10);
		if (status & ATA_BUSY) {
			ap->thr_state = THR_PIO_POLL;
			ap->thr_timeout = jiffies + ATA_TMOUT_PIO;
			return;
		}
	}

	/* handle BSY=0, DRQ=0 as error */
	if ((status & ATA_DRQ) == 0) {
		ap->thr_state = THR_PIO_ERR;
		return;
	}

	qc = ata_qc_from_tag(ap, ap->active_tag);
	assert(qc != NULL);

	cmd = qc->scsicmd;
	sg = qc->sg;

	if (qc->cursect == (qc->nsect - 1))
		ap->thr_state = THR_PIO_LAST;

	buf = kmap(sg[qc->cursg].page) +
	      sg[qc->cursg].offset + (qc->cursg_ofs * ATA_SECT_SIZE);

	qc->cursect++;
	qc->cursg_ofs++;

	if (cmd->use_sg)
1957
		if ((qc->cursg_ofs * ATA_SECT_SIZE) == sg_dma_len(&sg[qc->cursg])) {
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
			qc->cursg++;
			qc->cursg_ofs = 0;
		}

	DPRINTK("data %s, drv_stat 0x%X\n",
		qc->flags & ATA_QCFLAG_WRITE ? "write" : "read",
		status);

	/* do the actual data transfer */
	/* FIXME: mmio-ize */
	if (qc->flags & ATA_QCFLAG_WRITE)
		outsl(ap->ioaddr.data_addr, buf, ATA_SECT_DWORDS);
	else
		insl(ap->ioaddr.data_addr, buf, ATA_SECT_DWORDS);

	kunmap(sg[qc->cursg].page);
}

1976
#if 0 /* to be used eventually */
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
/**
 *	ata_eng_schedule - run an iteration of the pio/dma/whatever engine
 *	@ap: port on which activity will occur
 *	@eng: instance of engine
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */
static void ata_eng_schedule (struct ata_port *ap, struct ata_engine *eng)
{
	/* FIXME */
}
1989
#endif
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

/**
 *	ata_eng_timeout - Handle timeout of queued command
 *	@ap: Port on which timed-out command is active
 *
 *	Some part of the kernel (currently, only the SCSI layer)
 *	has noticed that the active command on port @ap has not
 *	completed after a specified length of time.  Handle this
 *	condition by disabling DMA (if necessary) and completing
 *	transactions, with error if necessary.
 *
 *	This also handles the case of the "lost interrupt", where
 *	for some reason (possibly hardware bug, possibly driver bug)
 *	an interrupt was not delivered to the driver, even though the
 *	transaction completed successfully.
 *
 *	LOCKING:
 *	Inherited from SCSI layer (none, can sleep)
 */

void ata_eng_timeout(struct ata_port *ap)
{
	u8 host_stat, drv_stat;
	struct ata_queued_cmd *qc;

	DPRINTK("ENTER\n");

	qc = ata_qc_from_tag(ap, ap->active_tag);
	if (!qc) {
		printk(KERN_ERR "ata%u: BUG: timeout without command\n",
		       ap->id);
		goto out;
	}

2024 2025 2026 2027 2028 2029 2030 2031
	/* hack alert!  We cannot use the supplied completion
	 * function from inside the ->eh_strategy_handler() thread.
	 * libata is the only user of ->eh_strategy_handler() in
	 * any kernel, so the default scsi_done() assumes it is
	 * not being called from the SCSI EH.
	 */
	qc->scsidone = scsi_finish_command;

2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
	switch (qc->tf.protocol) {
	case ATA_PROT_DMA_READ:
	case ATA_PROT_DMA_WRITE:
		if (ap->flags & ATA_FLAG_MMIO) {
			void *mmio = (void *) ap->ioaddr.bmdma_addr;
			host_stat = readb(mmio + ATA_DMA_STATUS);
		} else
			host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

		printk(KERN_ERR "ata%u: DMA timeout, stat 0x%x\n",
		       ap->id, host_stat);

		ata_dma_complete(ap, host_stat, 1);
		break;

	case ATA_PROT_NODATA:
		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);

		printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x\n",
		       ap->id, qc->tf.command, drv_stat);

		ata_qc_complete(qc, drv_stat, 1);
		break;

	default:
		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);

		printk(KERN_ERR "ata%u: unknown timeout, cmd 0x%x stat 0x%x\n",
		       ap->id, qc->tf.command, drv_stat);

		ata_qc_complete(qc, drv_stat, 1);
		break;
	}

out:
	DPRINTK("EXIT\n");
}

/**
 *	ata_qc_new -
 *	@ap:
 *	@dev:
 *
 *	LOCKING:
 */

static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
{
	struct ata_queued_cmd *qc = NULL;
	unsigned int i;

	for (i = 0; i < ATA_MAX_QUEUE; i++)
		if (!test_and_set_bit(i, &ap->qactive)) {
			qc = ata_qc_from_tag(ap, i);
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	ata_qc_new_init -
 *	@ap:
 *	@dev:
 *
 *	LOCKING:
 */

struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
				      struct ata_device *dev)
{
	struct ata_queued_cmd *qc;

	qc = ata_qc_new(ap);
	if (qc) {
		qc->sg = NULL;
		qc->flags = 0;
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;
		INIT_LIST_HEAD(&qc->node);
		init_MUTEX_LOCKED(&qc->sem);

		ata_tf_init(ap, &qc->tf, dev->devno);

		if (likely((dev->flags & ATA_DFLAG_PIO) == 0))
			qc->flags |= ATA_QCFLAG_DMA;
		if (dev->flags & ATA_DFLAG_LBA48)
			qc->tf.flags |= ATA_TFLAG_LBA48;
	}

	return qc;
}

/**
 *	ata_qc_complete -
 *	@qc:
 *	@drv_stat:
 *	@done_late:
 *
 *	LOCKING:
 *
 */

void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat, unsigned int done_late)
{
	struct ata_port *ap = qc->ap;
2142
	struct scsi_cmnd *cmd = qc->scsicmd;
2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178
	unsigned int tag, do_clear = 0;

	assert(qc != NULL);	/* ata_qc_from_tag _might_ return NULL */
	assert(qc->flags & ATA_QCFLAG_ACTIVE);

	if (likely(qc->flags & ATA_QCFLAG_SG))
		ata_sg_clean(qc);

	if (cmd) {
		if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ))) {
			if (qc->flags & ATA_QCFLAG_ATAPI)
				cmd->result = SAM_STAT_CHECK_CONDITION;
			else
				ata_to_sense_error(qc);
		} else {
			cmd->result = SAM_STAT_GOOD;
		}

		qc->scsidone(cmd);
	}

	qc->flags &= ~ATA_QCFLAG_ACTIVE;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		if (tag == ap->active_tag)
			ap->active_tag = ATA_TAG_POISON;
		qc->tag = ATA_TAG_POISON;
		do_clear = 1;
	}

	up(&qc->sem);

	if (likely(do_clear))
		clear_bit(tag, &ap->qactive);
}

2179
#if 0 /* to be used eventually */
2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200
/**
 *	ata_qc_push -
 *	@qc:
 *	@append:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */
static void ata_qc_push (struct ata_queued_cmd *qc, unsigned int append)
{
	struct ata_port *ap = qc->ap;
	struct ata_engine *eng = &ap->eng;

	if (likely(append))
		list_add_tail(&qc->node, &eng->q);
	else
		list_add(&qc->node, &eng->q);

	if (!test_and_set_bit(ATA_EFLG_ACTIVE, &eng->flags))
		ata_eng_schedule(ap, eng);
}
2201
#endif
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214

/**
 *	ata_qc_issue -
 *	@qc:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */
int ata_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
2215
	struct scsi_cmnd *cmd = qc->scsicmd;
2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
	unsigned int dma = qc->flags & ATA_QCFLAG_DMA;

	ata_dev_select(ap, qc->dev->devno, 1, 0);

	/* set up SG table */
	if (cmd->use_sg) {
		if (ata_sg_setup(qc))
			goto err_out;
	} else {
		if (ata_sg_setup_one(qc))
			goto err_out;
	}

	ap->ops->fill_sg(qc);

	qc->ap->active_tag = qc->tag;
	qc->flags |= ATA_QCFLAG_ACTIVE;

	if (likely(dma)) {
		ap->ops->tf_load(ap, &qc->tf);	/* load tf registers */
		ap->ops->bmdma_start(qc);	/* initiate bmdma */
	} else
		/* load tf registers, initiate polling pio */
		ata_pio_start(qc);

	return 0;

err_out:
	return -1;
}

/**
 *	ata_bmdma_start_mmio -
 *	@qc:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int rw = (qc->flags & ATA_QCFLAG_WRITE);
	u8 host_stat, dmactl;
	void *mmio = (void *) ap->ioaddr.bmdma_addr;

	/* load PRD table addr. */
	mb();	/* make sure PRD table writes are visible to controller */
	writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);

	/* specify data direction */
	/* FIXME: redundant to later start-dma command? */
	writeb(rw ? 0 : ATA_DMA_WR, mmio + ATA_DMA_CMD);

	/* clear interrupt, error bits */
	host_stat = readb(mmio + ATA_DMA_STATUS);
	writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR, mmio + ATA_DMA_STATUS);

	/* issue r/w command */
	ap->ops->exec_command(ap, &qc->tf);

	/* start host DMA transaction */
	dmactl = readb(mmio + ATA_DMA_CMD);
	writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);

	/* Strictly, one may wish to issue a readb() here, to
	 * flush the mmio write.  However, control also passes
	 * to the hardware at this point, and it will interrupt
	 * us when we are to resume control.  So, in effect,
	 * we don't care when the mmio write flushes.
	 * Further, a read of the DMA status register _immediately_
	 * following the write may not be what certain flaky hardware
	 * is expected, so I think it is best to not add a readb()
	 * without first all the MMIO ATA cards/mobos.
	 * Or maybe I'm just being paranoid.
	 */
}

/**
 *	ata_bmdma_start_pio -
 *	@qc:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int rw = (qc->flags & ATA_QCFLAG_WRITE);
	u8 host_stat, dmactl;

	/* load PRD table addr. */
	outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);

	/* specify data direction */
	/* FIXME: redundant to later start-dma command? */
	outb(rw ? 0 : ATA_DMA_WR, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);

	/* clear interrupt, error bits */
	host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
	outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
	     ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

	/* issue r/w command */
	ap->ops->exec_command(ap, &qc->tf);

	/* start host DMA transaction */
	dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	outb(dmactl | ATA_DMA_START,
	     ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
}

/**
 *	ata_dma_complete -
 *	@ap:
 *	@host_stat:
 *	@done_late:
 *
 *	LOCKING:
 */

static void ata_dma_complete(struct ata_port *ap, u8 host_stat,
			     unsigned int done_late)
{
	VPRINTK("ENTER\n");

	if (ap->flags & ATA_FLAG_MMIO) {
		void *mmio = (void *) ap->ioaddr.bmdma_addr;

		/* clear start/stop bit */
		writeb(0, mmio + ATA_DMA_CMD);

		/* ack intr, err bits */
		writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
		       mmio + ATA_DMA_STATUS);
	} else {
		/* clear start/stop bit */
		outb(0, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);

		/* ack intr, err bits */
		outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
		     ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
	}


	/* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
	ata_altstatus(ap);		/* dummy read */

	DPRINTK("host %u, host_stat==0x%X, drv_stat==0x%X\n",
		ap->id, (u32) host_stat, (u32) ata_chk_status(ap));

	/* get drive status; clear intr; complete txn */
	ata_qc_complete(ata_qc_from_tag(ap, ap->active_tag),
			ata_wait_idle(ap), done_late);
}

/**
 *	ata_host_intr - Handle host interrupt for given (port, task)
 *	@ap: Port on which interrupt arrived (possibly...)
 *	@qc: Taskfile currently active in engine
 *
 *	Handle host interrupt for given queued command.  Currently,
 *	only DMA interrupts are handled.  All other commands are
 *	handled via polling with interrupts disabled (nIEN bit).
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

2389 2390
inline unsigned int ata_host_intr (struct ata_port *ap,
				   struct ata_queued_cmd *qc)
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620
{
	u8 status, host_stat;
	unsigned int handled = 0;

	switch (qc->tf.protocol) {
	case ATA_PROT_DMA_READ:
	case ATA_PROT_DMA_WRITE:
		if (ap->flags & ATA_FLAG_MMIO) {
			void *mmio = (void *) ap->ioaddr.bmdma_addr;
			host_stat = readb(mmio + ATA_DMA_STATUS);
		} else
			host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
		VPRINTK("BUS_DMA (host_stat 0x%X)\n", host_stat);

		if (!(host_stat & ATA_DMA_INTR)) {
			ap->stats.idle_irq++;
			break;
		}

		ata_dma_complete(ap, host_stat, 0);
		handled = 1;
		break;

	case ATA_PROT_NODATA:	/* command completion, but no data xfer */
		status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
		DPRINTK("BUS_NODATA (drv_stat 0x%X)\n", status);
		ata_qc_complete(qc, status, 0);
		handled = 1;
		break;

	default:
		ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
		if ((ap->stats.idle_irq % 1000) == 0) {
			handled = 1;
			ata_irq_ack(ap, 0); /* debug trap */
			printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
		}
#endif
		break;
	}

	return handled;
}

/**
 *	ata_interrupt -
 *	@irq:
 *	@dev_instance:
 *	@regs:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
{
	struct ata_host_set *host_set = dev_instance;
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
	spin_lock_irqsave(&host_set->lock, flags);

	for (i = 0; i < host_set->n_ports; i++) {
		struct ata_port *ap;

		ap = host_set->ports[i];
		if (ap && (!(ap->flags & ATA_FLAG_PORT_DISABLED))) {
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
			if (qc && ((qc->flags & ATA_QCFLAG_POLL) == 0))
				handled += ata_host_intr(ap, qc);
		}
	}

	spin_unlock_irqrestore(&host_set->lock, flags);

	return IRQ_RETVAL(handled);
}

/**
 *	ata_thread_wake -
 *	@ap:
 *	@thr_state:
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_thread_wake(struct ata_port *ap, unsigned int thr_state)
{
	assert(ap->thr_state == THR_IDLE);
	ap->thr_state = thr_state;
	up(&ap->thr_sem);
}

/**
 *	ata_thread_timer -
 *	@opaque:
 *
 *	LOCKING:
 */

static void ata_thread_timer(unsigned long opaque)
{
	struct ata_port *ap = (struct ata_port *) opaque;

	up(&ap->thr_sem);
}

/**
 *	ata_thread_iter -
 *	@ap:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

static unsigned long ata_thread_iter(struct ata_port *ap)
{
	long timeout = 0;

	DPRINTK("ata%u: thr_state %s\n",
		ap->id, ata_thr_state_name(ap->thr_state));

	switch (ap->thr_state) {
	case THR_UNKNOWN:
		ap->thr_state = THR_PORT_RESET;
		break;

	case THR_PROBE_START:
		down(&ap->sem);
		ap->thr_state = THR_PORT_RESET;
		break;

	case THR_PORT_RESET:
		ata_port_reset(ap);
		break;

	case THR_PROBE_SUCCESS:
		up(&ap->probe_sem);
		ap->thr_state = THR_IDLE;
		break;

	case THR_PROBE_FAILED:
		up(&ap->probe_sem);
		ap->thr_state = THR_AWAIT_DEATH;
		break;

	case THR_AWAIT_DEATH:
		timeout = -1;
		break;

	case THR_IDLE:
		timeout = 30 * HZ;
		break;

	case THR_PIO:
		ata_pio_sector(ap);
		break;

	case THR_PIO_LAST:
		ata_pio_complete(ap);
		break;

	case THR_PIO_POLL:
	case THR_PIO_LAST_POLL:
		timeout = ata_pio_poll(ap);
		break;

	case THR_PIO_TMOUT:
		printk(KERN_ERR "ata%d: FIXME: THR_PIO_TMOUT\n", /* FIXME */
		       ap->id);
		timeout = 11 * HZ;
		break;

	case THR_PIO_ERR:
		printk(KERN_ERR "ata%d: FIXME: THR_PIO_ERR\n", /* FIXME */
		       ap->id);
		timeout = 11 * HZ;
		break;

	case THR_PACKET:
		atapi_cdb_send(ap);
		break;

	default:
		printk(KERN_DEBUG "ata%u: unknown thr state %s\n",
		       ap->id, ata_thr_state_name(ap->thr_state));
		break;
	}

	DPRINTK("ata%u: new thr_state %s, returning %ld\n",
		ap->id, ata_thr_state_name(ap->thr_state), timeout);
	return timeout;
}

/**
 *	ata_thread -
 *	@data:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

static int ata_thread (void *data)
{
        struct ata_port *ap = data;
	long timeout;

	daemonize ("katad-%u", ap->id);
	allow_signal(SIGTERM);

        while (1) {
		cond_resched();

		timeout = ata_thread_iter(ap);

                if (signal_pending (current))
                        flush_signals(current);
2621 2622 2623 2624
                        
                if (current->flags & PF_FREEZE)
			refrigerator(PF_IOTHREAD);
                                                        
2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643

                if ((timeout < 0) || (ap->time_to_die))
                        break;

 		/* note sleeping for full timeout not guaranteed (that's ok) */
		if (timeout) {
			mod_timer(&ap->thr_timer, jiffies + timeout);
			down_interruptible(&ap->thr_sem);

                	if (signal_pending (current))
                        	flush_signals(current);

                	if (ap->time_to_die)
                        	break;
		}
        }

	printk(KERN_DEBUG "ata%u: thread exiting\n", ap->id);
	ap->thr_pid = -1;
2644 2645
	del_timer_sync(&ap->thr_timer);
	complete_and_exit (&ap->thr_exited, 0);
2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
}

/**
 *	ata_thread_kill - kill per-port kernel thread
 *	@ap: port those thread is to be killed
 *
 *	LOCKING:
 *
 */

static int ata_thread_kill(struct ata_port *ap)
{
	int ret = 0;

	if (ap->thr_pid >= 0) {
		ap->time_to_die = 1;
		wmb();
		ret = kill_proc(ap->thr_pid, SIGTERM, 1);
		if (ret)
			printk(KERN_ERR "ata%d: unable to kill kernel thread\n",
			       ap->id);
		else
			wait_for_completion(&ap->thr_exited);
	}

	return ret;
}

/**
 *	atapi_cdb_send - Write CDB bytes to hardware
 *	@ap: Port to which ATAPI device is attached.
 *
 *	When device has indicated its readiness to accept
 *	a CDB, this function is called.  Send the CDB.
 *	If DMA is to be performed, exit immediately.
 *	Otherwise, we are in polling mode, so poll
 *	status under operation succeeds or fails.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */

static void atapi_cdb_send(struct ata_port *ap)
{
	struct ata_queued_cmd *qc;
	u8 status;

	qc = ata_qc_from_tag(ap, ap->active_tag);
	assert(qc != NULL);
	assert(qc->flags & ATA_QCFLAG_ACTIVE);

	/* sleep-wait for BSY to clear */
	DPRINTK("busy wait\n");
	if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB))
		goto err_out;

	/* make sure DRQ is set */
	status = ata_chk_status(ap);
	if ((status & ATA_DRQ) == 0)
		goto err_out;

	/* send SCSI cdb */
	/* FIXME: mmio-ize */
	DPRINTK("send cdb\n");
	outsl(ap->ioaddr.data_addr,
	      qc->scsicmd->cmnd, ap->host->max_cmd_len / 4);

	/* if we are DMA'ing, irq handler takes over from here */
	if (qc->tf.feature == ATAPI_PKT_DMA)
		goto out;

	/* sleep-wait for BSY to clear */
	DPRINTK("busy wait 2\n");
	if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB))
		goto err_out;

	/* wait for BSY,DRQ to clear */
	status = ata_wait_idle(ap);
	if (status & (ATA_BUSY | ATA_DRQ))
		goto err_out;

	/* transaction completed, indicate such to scsi stack */
	ata_qc_complete(qc, status, 0);
	ata_irq_on(ap);

out:
	ap->thr_state = THR_IDLE;
	return;

err_out:
	ata_qc_complete(qc, ATA_ERR, 0);
	goto out;
}

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int ata_port_start (struct ata_port *ap)
{
	struct pci_dev *pdev = ap->host_set->pdev;

	ap->prd = pci_alloc_consistent(pdev, ATA_PRD_TBL_SZ, &ap->prd_dma);
	if (!ap->prd)
		return -ENOMEM;
	
2748
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
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	return 0;
}

void ata_port_stop (struct ata_port *ap)
{
	struct pci_dev *pdev = ap->host_set->pdev;

	pci_free_consistent(pdev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
}

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/**
 *	ata_host_remove -
 *	@ap:
 *	@do_unregister:
 *
 *	LOCKING:
 */

static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
{
	struct Scsi_Host *sh = ap->host;

	DPRINTK("ENTER\n");

	if (do_unregister)
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		scsi_remove_host(sh);
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	ata_thread_kill(ap);	/* FIXME: check return val */

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	ap->ops->port_stop(ap);
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}

/**
 *	ata_host_init -
 *	@host:
 *	@ent:
 *	@port_no:
 *
 *	LOCKING:
 *
 */

static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
			  struct ata_host_set *host_set,
			  struct ata_probe_ent *ent, unsigned int port_no)
{
	unsigned int i;

	host->max_id = 16;
	host->max_lun = 1;
	host->max_channel = 1;
	host->unique_id = ata_unique_id++;
	host->max_cmd_len = 12;
	scsi_set_device(host, &ent->pdev->dev);

	ap->flags = ATA_FLAG_PORT_DISABLED;
	ap->id = host->unique_id;
	ap->host = host;
	ap->ctl = ATA_DEVCTL_OBS;
	ap->host_set = host_set;
	ap->port_no = port_no;
	ap->pio_mask = ent->pio_mask;
	ap->udma_mask = ent->udma_mask;
	ap->flags |= ent->host_flags;
	ap->ops = ent->port_ops;
	ap->thr_state = THR_PROBE_START;
	ap->cbl = ATA_CBL_NONE;
	ap->device[0].flags = ATA_DFLAG_MASTER;
	ap->active_tag = ATA_TAG_POISON;
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	ap->last_ctl = 0xFF;
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	/* ata_engine init */
	ap->eng.flags = 0;
	INIT_LIST_HEAD(&ap->eng.q);

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ap->device[i].devno = i;

	init_completion(&ap->thr_exited);
	init_MUTEX_LOCKED(&ap->probe_sem);
	init_MUTEX_LOCKED(&ap->sem);
	init_MUTEX_LOCKED(&ap->thr_sem);

	init_timer(&ap->thr_timer);
	ap->thr_timer.function = ata_thread_timer;
	ap->thr_timer.data = (unsigned long) ap;

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif

	memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
}

/**
 *	ata_host_add -
 *	@ent:
 *	@host_set:
 *	@port_no:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

static struct ata_port * ata_host_add(struct ata_probe_ent *ent,
				      struct ata_host_set *host_set,
				      unsigned int port_no)
{
	struct Scsi_Host *host;
	struct ata_port *ap;
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	int rc;
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	DPRINTK("ENTER\n");
	host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!host)
		return NULL;

	ap = (struct ata_port *) &host->hostdata[0];

	ata_host_init(ap, host, host_set, ent, port_no);

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	rc = ap->ops->port_start(ap);
	if (rc)
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		goto err_out;

	ap->thr_pid = kernel_thread(ata_thread, ap, CLONE_FS | CLONE_FILES);
	if (ap->thr_pid < 0) {
		printk(KERN_ERR "ata%d: unable to start kernel thread\n",
		       ap->id);
		goto err_out_free;
	}

	return ap;

err_out_free:
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	ap->ops->port_stop(ap);
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err_out:
	scsi_host_put(host);
	return NULL;
}

/**
 *	ata_device_add -
 *	@ent:
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

int ata_device_add(struct ata_probe_ent *ent)
{
	unsigned int count = 0, i;
	struct pci_dev *pdev = ent->pdev;
	struct ata_host_set *host_set;

	DPRINTK("ENTER\n");
	/* alloc a container for our list of ATA ports (buses) */
	host_set = kmalloc(sizeof(struct ata_host_set) +
			   (ent->n_ports * sizeof(void *)), GFP_KERNEL);
	if (!host_set)
		return 0;
	memset(host_set, 0, sizeof(struct ata_host_set) + (ent->n_ports * sizeof(void *)));
	spin_lock_init(&host_set->lock);

	host_set->pdev = pdev;
	host_set->n_ports = ent->n_ports;
	host_set->irq = ent->irq;
	host_set->mmio_base = ent->mmio_base;
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	host_set->private_data = ent->private_data;
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	/* register each port bound to this device */
	for (i = 0; i < ent->n_ports; i++) {
		struct ata_port *ap;

		ap = ata_host_add(ent, host_set, i);
		if (!ap)
			goto err_out;

		host_set->ports[i] = ap;

		/* print per-port info to dmesg */
		printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
				 "bmdma 0x%lX irq %lu\n",
			ap->id,
			ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
			ata_udma_string(ent->udma_mask),
	       		ap->ioaddr.cmd_addr,
	       		ap->ioaddr.ctl_addr,
	       		ap->ioaddr.bmdma_addr,
	       		ent->irq);

		count++;
	}

	if (!count) {
		kfree(host_set);
		return 0;
	}

	/* obtain irq, that is shared between channels */
	if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
			DRV_NAME, host_set))
		goto err_out;

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < count; i++) {
		struct ata_port *ap;
		int rc;

		ap = host_set->ports[i];

		DPRINTK("ata%u: probe begin\n", ap->id);
		up(&ap->sem);		/* start probe */

		DPRINTK("ata%u: probe-wait begin\n", ap->id);
		down(&ap->probe_sem);	/* wait for end */

		DPRINTK("ata%u: probe-wait end\n", ap->id);

		rc = scsi_add_host(ap->host, &pdev->dev);
		if (rc) {
			printk(KERN_ERR "ata%u: scsi_add_host failed\n",
			       ap->id);
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
	}

	/* probes are done, now scan each port's disk(s) */
	DPRINTK("probe begin\n");
	for (i = 0; i < count; i++) {
		struct ata_port *ap = host_set->ports[i];

		scsi_scan_host(ap->host);
	}

	pci_set_drvdata(pdev, host_set);

	VPRINTK("EXIT, returning %u\n", ent->n_ports);
	return ent->n_ports; /* success */

err_out:
	for (i = 0; i < count; i++) {
		ata_host_remove(host_set->ports[i], 1);
		scsi_host_put(host_set->ports[i]->host);
	}
	kfree(host_set);
	VPRINTK("EXIT, returning 0\n");
	return 0;
}

/**
 *	ata_scsi_release - SCSI layer callback hook for host unload
 *	@host: libata host to be unloaded
 *
 *	Performs all duties necessary to shut down a libata port:
 *	Kill port kthread, disable port, and release resources.
 *
 *	LOCKING:
 *	Inherited from SCSI layer.
 *
 *	RETURNS:
 *	One.
 */

int ata_scsi_release(struct Scsi_Host *host)
{
	struct ata_port *ap = (struct ata_port *) &host->hostdata[0];

	DPRINTK("ENTER\n");

	ap->ops->port_disable(ap);
	ata_host_remove(ap, 0);

	DPRINTK("EXIT\n");
	return 1;
}

/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr:
 */
void ata_std_ports(struct ata_ioports *ioaddr)
{
	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
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	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
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	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
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	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
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}

/**
 *	ata_pci_init_one -
 *	@pdev:
 *	@port_info:
 *	@n_ports:
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 *
 *	RETURNS:
 *
 */

int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
		      unsigned int n_ports)
{
	struct ata_probe_ent *probe_ent, *probe_ent2 = NULL;
	struct ata_port_info *port0, *port1;
	u8 tmp8, mask;
	unsigned int legacy_mode = 0;
	int rc;

	DPRINTK("ENTER\n");

	port0 = port_info[0];
	if (n_ports > 1)
		port1 = port_info[1];
	else
		port1 = port0;

	if ((port0->host_flags & ATA_FLAG_NO_LEGACY) == 0) {
		/* TODO: support transitioning to native mode? */
		pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
		mask = (1 << 2) | (1 << 0);
		if ((tmp8 & mask) != mask)
			legacy_mode = (1 << 3);
	}

	/* FIXME... */
	if ((!legacy_mode) && (n_ports > 1)) {
		printk(KERN_ERR "ata: BUG: native mode, n_ports > 1\n");
		return -EINVAL;
	}

	rc = pci_enable_device(pdev);
	if (rc)
		return rc;

	rc = pci_request_regions(pdev, DRV_NAME);
	if (rc)
		goto err_out;

	if (legacy_mode) {
		if (!request_region(0x1f0, 8, "libata")) {
			struct resource *conflict, res;
			res.start = 0x1f0;
			res.end = 0x1f0 + 8 - 1;
			conflict = ____request_resource(&ioport_resource, &res);
			if (!strcmp(conflict->name, "libata"))
				legacy_mode |= (1 << 0);
			else
				printk(KERN_WARNING "ata: 0x1f0 IDE port busy\n");
		} else
			legacy_mode |= (1 << 0);

		if (!request_region(0x170, 8, "libata")) {
			struct resource *conflict, res;
			res.start = 0x170;
			res.end = 0x170 + 8 - 1;
			conflict = ____request_resource(&ioport_resource, &res);
			if (!strcmp(conflict->name, "libata"))
				legacy_mode |= (1 << 1);
			else
				printk(KERN_WARNING "ata: 0x170 IDE port busy\n");
		} else
			legacy_mode |= (1 << 1);
	}

	/* we have legacy mode, but all ports are unavailable */
	if (legacy_mode == (1 << 3)) {
		rc = -EBUSY;
		goto err_out_regions;
	}

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
		goto err_out_regions;

	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
	if (!probe_ent) {
		rc = -ENOMEM;
		goto err_out_regions;
	}

	memset(probe_ent, 0, sizeof(*probe_ent));
	probe_ent->pdev = pdev;
	INIT_LIST_HEAD(&probe_ent->node);

	if (legacy_mode) {
		probe_ent2 = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
		if (!probe_ent2) {
			rc = -ENOMEM;
			goto err_out_free_ent;
		}

		memset(probe_ent2, 0, sizeof(*probe_ent));
		probe_ent2->pdev = pdev;
		INIT_LIST_HEAD(&probe_ent2->node);
	}

	probe_ent->port[0].bmdma_addr = pci_resource_start(pdev, 4);
	probe_ent->sht = port0->sht;
	probe_ent->host_flags = port0->host_flags;
	probe_ent->pio_mask = port0->pio_mask;
	probe_ent->udma_mask = port0->udma_mask;
	probe_ent->port_ops = port0->port_ops;

	if (legacy_mode) {
		probe_ent->port[0].cmd_addr = 0x1f0;
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		probe_ent->port[0].altstatus_addr =
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		probe_ent->port[0].ctl_addr = 0x3f6;
		probe_ent->n_ports = 1;
		probe_ent->irq = 14;
		ata_std_ports(&probe_ent->port[0]);

		probe_ent2->port[0].cmd_addr = 0x170;
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		probe_ent2->port[0].altstatus_addr =
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		probe_ent2->port[0].ctl_addr = 0x376;
		probe_ent2->port[0].bmdma_addr = pci_resource_start(pdev, 4)+8;
		probe_ent2->n_ports = 1;
		probe_ent2->irq = 15;
		ata_std_ports(&probe_ent2->port[0]);

		probe_ent2->sht = port1->sht;
		probe_ent2->host_flags = port1->host_flags;
		probe_ent2->pio_mask = port1->pio_mask;
		probe_ent2->udma_mask = port1->udma_mask;
		probe_ent2->port_ops = port1->port_ops;
	} else {
		probe_ent->port[0].cmd_addr = pci_resource_start(pdev, 0);
		ata_std_ports(&probe_ent->port[0]);
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		probe_ent->port[0].altstatus_addr =
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		probe_ent->port[0].ctl_addr =
			pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;

		probe_ent->port[1].cmd_addr = pci_resource_start(pdev, 2);
		ata_std_ports(&probe_ent->port[1]);
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		probe_ent->port[1].altstatus_addr =
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		probe_ent->port[1].ctl_addr =
			pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
		probe_ent->port[1].bmdma_addr = pci_resource_start(pdev, 4) + 8;

		probe_ent->n_ports = 2;
		probe_ent->irq = pdev->irq;
		probe_ent->irq_flags = SA_SHIRQ;
	}

	pci_set_master(pdev);

	/* FIXME: check ata_device_add return */
	if (legacy_mode) {
		if (legacy_mode & (1 << 0))
			ata_device_add(probe_ent);
		if (legacy_mode & (1 << 1))
			ata_device_add(probe_ent2);
		kfree(probe_ent2);
	} else {
		ata_device_add(probe_ent);
		assert(probe_ent2 == NULL);
	}
	kfree(probe_ent);

	return 0;

err_out_free_ent:
	kfree(probe_ent);
err_out_regions:
	if (legacy_mode & (1 << 0))
		release_region(0x1f0, 8);
	if (legacy_mode & (1 << 1))
		release_region(0x170, 8);
	pci_release_regions(pdev);
err_out:
	pci_disable_device(pdev);
	return rc;
}

/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
 *	PCI layer indicates to libata via this hook that
 *	hot-unplug or module unload event has occured.
 *	Handle this by unregistering all objects associated
 *	with this PCI device.  Free those objects.  Then finally
 *	release PCI resources and disable device.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */

void ata_pci_remove_one (struct pci_dev *pdev)
{
	struct ata_host_set *host_set = pci_get_drvdata(pdev);
	struct ata_port *ap;
	unsigned int i;

	for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];

		scsi_remove_host(ap->host);
	}

	free_irq(host_set->irq, host_set);
	if (host_set->mmio_base)
		iounmap(host_set->mmio_base);
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	if (host_set->ports[0]->ops->host_stop)
		host_set->ports[0]->ops->host_stop(host_set);
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	for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];

		ata_scsi_release(ap->host);
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		scsi_host_put(ap->host);
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	}

	pci_release_regions(pdev);

	for (i = 0; i < host_set->n_ports; i++) {
		struct ata_ioports *ioaddr;

		ap = host_set->ports[i];
		ioaddr = &ap->ioaddr;

		if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
			if (ioaddr->cmd_addr == 0x1f0)
				release_region(0x1f0, 8);
			else if (ioaddr->cmd_addr == 0x170)
				release_region(0x170, 8);
		}
	}

Jeff Garzik's avatar
Jeff Garzik committed
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	kfree(host_set);
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	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
}

/* move to PCI subsystem */
int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits)
{
	unsigned long tmp = 0;

	switch (bits->width) {
	case 1: {
		u8 tmp8 = 0;
		pci_read_config_byte(pdev, bits->reg, &tmp8);
		tmp = tmp8;
		break;
	}
	case 2: {
		u16 tmp16 = 0;
		pci_read_config_word(pdev, bits->reg, &tmp16);
		tmp = tmp16;
		break;
	}
	case 4: {
		u32 tmp32 = 0;
		pci_read_config_dword(pdev, bits->reg, &tmp32);
		tmp = tmp32;
		break;
	}

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}

3337

3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362
/**
 *	ata_init -
 *
 *	LOCKING:
 *
 *	RETURNS:
 *
 */

static int __init ata_init(void)
{
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

module_init(ata_init);

/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */

EXPORT_SYMBOL_GPL(pci_test_config_bits);
3363
EXPORT_SYMBOL_GPL(ata_std_bios_param);
3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
EXPORT_SYMBOL_GPL(ata_std_ports);
EXPORT_SYMBOL_GPL(ata_device_add);
EXPORT_SYMBOL_GPL(ata_qc_complete);
EXPORT_SYMBOL_GPL(ata_eng_timeout);
EXPORT_SYMBOL_GPL(ata_tf_load_pio);
EXPORT_SYMBOL_GPL(ata_tf_load_mmio);
EXPORT_SYMBOL_GPL(ata_tf_read_pio);
EXPORT_SYMBOL_GPL(ata_tf_read_mmio);
EXPORT_SYMBOL_GPL(ata_check_status_pio);
EXPORT_SYMBOL_GPL(ata_check_status_mmio);
EXPORT_SYMBOL_GPL(ata_exec_command_pio);
EXPORT_SYMBOL_GPL(ata_exec_command_mmio);
3376 3377
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_port_stop);
3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392
EXPORT_SYMBOL_GPL(ata_interrupt);
EXPORT_SYMBOL_GPL(ata_fill_sg);
EXPORT_SYMBOL_GPL(ata_bmdma_start_pio);
EXPORT_SYMBOL_GPL(ata_bmdma_start_mmio);
EXPORT_SYMBOL_GPL(ata_port_probe);
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(pata_phy_config);
EXPORT_SYMBOL_GPL(ata_bus_reset);
EXPORT_SYMBOL_GPL(ata_port_disable);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_error);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
EXPORT_SYMBOL_GPL(ata_scsi_release);
3393
EXPORT_SYMBOL_GPL(ata_host_intr);