text: /*
   *  Copyright 2003-2005 Red Hat, Inc.  All rights reserved.
   *  Copyright 2003-2005 Jeff Garzik
   *
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2, or (at your option)
   *  any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; see the file COPYING.  If not, write to
   *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   *
   *  libata documentation is available via 'make {ps|pdf}docs',
   *  as Documentation/DocBook/libata.*
   *
   */
  
  #ifndef __LINUX_LIBATA_H__
  #define __LINUX_LIBATA_H__
  
  #include <linux/delay.h>
  #include <linux/jiffies.h>
  #include <linux/interrupt.h>
  #include <linux/dma-mapping.h>
  #include <linux/scatterlist.h>
  #include <linux/io.h>
  #include <linux/ata.h>
  #include <linux/workqueue.h>
  #include <scsi/scsi_host.h>
  #include <linux/acpi.h>
  #include <linux/cdrom.h>
  #include <linux/sched.h>
  
  /*
   * Define if arch has non-standard setup.  This is a _PCI_ standard
   * not a legacy or ISA standard.
   */
  #ifdef CONFIG_ATA_NONSTANDARD
  #include <asm/libata-portmap.h>
  #else
  #define ATA_PRIMARY_IRQ(dev)	14
  #define ATA_SECONDARY_IRQ(dev)	15
  #endif
  
  /*
   * compile-time options: to be removed as soon as all the drivers are
   * converted to the new debugging mechanism
   */
  #undef ATA_DEBUG		/* debugging output */
  #undef ATA_VERBOSE_DEBUG	/* yet more debugging output */
  #undef ATA_IRQ_TRAP		/* define to ack screaming irqs */
  #undef ATA_NDEBUG		/* define to disable quick runtime checks */
  
  
  /* note: prints function name for you */
  #ifdef ATA_DEBUG
  #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  #ifdef ATA_VERBOSE_DEBUG
  #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  #else
  #define VPRINTK(fmt, args...)
  #endif	/* ATA_VERBOSE_DEBUG */
  #else
  #define DPRINTK(fmt, args...)
  #define VPRINTK(fmt, args...)
  #endif	/* ATA_DEBUG */
  
  #define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  
  #define ata_print_version_once(dev, version)			\
  ({								\
  	static bool __print_once;				\
  								\
  	if (!__print_once) {					\
  		__print_once = true;				\
  		ata_print_version(dev, version);		\
  	}							\
  })
  
  /* NEW: debug levels */
  #define HAVE_LIBATA_MSG 1
  
  enum {
  	ATA_MSG_DRV	= 0x0001,
  	ATA_MSG_INFO	= 0x0002,
  	ATA_MSG_PROBE	= 0x0004,
  	ATA_MSG_WARN	= 0x0008,
  	ATA_MSG_MALLOC	= 0x0010,
  	ATA_MSG_CTL	= 0x0020,
  	ATA_MSG_INTR	= 0x0040,
  	ATA_MSG_ERR	= 0x0080,
  };
  
  #define ata_msg_drv(p)    ((p)->msg_enable & ATA_MSG_DRV)
  #define ata_msg_info(p)   ((p)->msg_enable & ATA_MSG_INFO)
  #define ata_msg_probe(p)  ((p)->msg_enable & ATA_MSG_PROBE)
  #define ata_msg_warn(p)   ((p)->msg_enable & ATA_MSG_WARN)
  #define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
  #define ata_msg_ctl(p)    ((p)->msg_enable & ATA_MSG_CTL)
  #define ata_msg_intr(p)   ((p)->msg_enable & ATA_MSG_INTR)
  #define ata_msg_err(p)    ((p)->msg_enable & ATA_MSG_ERR)
  
  static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
  {
  	if (dval < 0 || dval >= (sizeof(u32) * 8))
  		return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
  	if (!dval)
  		return 0;
  	return (1 << dval) - 1;
  }
  
  /* defines only for the constants which don't work well as enums */
  #define ATA_TAG_POISON		0xfafbfcfdU
  
  enum {
  	/* various global constants */
  	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
  	LIBATA_DUMB_MAX_PRD	= ATA_MAX_PRD / 4,	/* Worst case */
  	ATA_DEF_QUEUE		= 1,
  	/* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
  	ATA_MAX_QUEUE		= 32,
  	ATA_TAG_INTERNAL	= ATA_MAX_QUEUE - 1,
  	ATA_SHORT_PAUSE		= 16,
  
  	ATAPI_MAX_DRAIN		= 16 << 10,
  
  	ATA_ALL_DEVICES		= (1 << ATA_MAX_DEVICES) - 1,
  
  	ATA_SHT_EMULATED	= 1,
  	ATA_SHT_THIS_ID		= -1,
  	ATA_SHT_USE_CLUSTERING	= 1,
  
  	/* struct ata_taskfile flags */
  	ATA_TFLAG_LBA48		= (1 << 0), /* enable 48-bit LBA and "HOB" */
  	ATA_TFLAG_ISADDR	= (1 << 1), /* enable r/w to nsect/lba regs */
  	ATA_TFLAG_DEVICE	= (1 << 2), /* enable r/w to device reg */
  	ATA_TFLAG_WRITE		= (1 << 3), /* data dir: host->dev==1 (write) */
  	ATA_TFLAG_LBA		= (1 << 4), /* enable LBA */
  	ATA_TFLAG_FUA		= (1 << 5), /* enable FUA */
  	ATA_TFLAG_POLLING	= (1 << 6), /* set nIEN to 1 and use polling */
  
  	/* struct ata_device stuff */
  	ATA_DFLAG_LBA		= (1 << 0), /* device supports LBA */
  	ATA_DFLAG_LBA48		= (1 << 1), /* device supports LBA48 */
  	ATA_DFLAG_CDB_INTR	= (1 << 2), /* device asserts INTRQ when ready for CDB */
  	ATA_DFLAG_NCQ		= (1 << 3), /* device supports NCQ */
  	ATA_DFLAG_FLUSH_EXT	= (1 << 4), /* do FLUSH_EXT instead of FLUSH */
  	ATA_DFLAG_ACPI_PENDING	= (1 << 5), /* ACPI resume action pending */
  	ATA_DFLAG_ACPI_FAILED	= (1 << 6), /* ACPI on devcfg has failed */
  	ATA_DFLAG_AN		= (1 << 7), /* AN configured */
  	ATA_DFLAG_DMADIR	= (1 << 10), /* device requires DMADIR */
  	ATA_DFLAG_CFG_MASK	= (1 << 12) - 1,
  
  	ATA_DFLAG_PIO		= (1 << 12), /* device limited to PIO mode */
  	ATA_DFLAG_NCQ_OFF	= (1 << 13), /* device limited to non-NCQ mode */
  	ATA_DFLAG_SLEEPING	= (1 << 15), /* device is sleeping */
  	ATA_DFLAG_DUBIOUS_XFER	= (1 << 16), /* data transfer not verified */
  	ATA_DFLAG_NO_UNLOAD	= (1 << 17), /* device doesn't support unload */
  	ATA_DFLAG_UNLOCK_HPA	= (1 << 18), /* unlock HPA */
  	ATA_DFLAG_NCQ_SEND_RECV = (1 << 19), /* device supports NCQ SEND and RECV */
  	ATA_DFLAG_INIT_MASK	= (1 << 24) - 1,
  
  	ATA_DFLAG_DETACH	= (1 << 24),
  	ATA_DFLAG_DETACHED	= (1 << 25),
  
  	ATA_DFLAG_DA		= (1 << 26), /* device supports Device Attention */
  	ATA_DFLAG_DEVSLP	= (1 << 27), /* device supports Device Sleep */
  	ATA_DFLAG_ACPI_DISABLED = (1 << 28), /* ACPI for the device is disabled */
  	ATA_DFLAG_D_SENSE	= (1 << 29), /* Descriptor sense requested */
  	ATA_DFLAG_ZAC		= (1 << 30), /* ZAC device */
  
  	ATA_DEV_UNKNOWN		= 0,	/* unknown device */
  	ATA_DEV_ATA		= 1,	/* ATA device */
  	ATA_DEV_ATA_UNSUP	= 2,	/* ATA device (unsupported) */
  	ATA_DEV_ATAPI		= 3,	/* ATAPI device */
  	ATA_DEV_ATAPI_UNSUP	= 4,	/* ATAPI device (unsupported) */
  	ATA_DEV_PMP		= 5,	/* SATA port multiplier */
  	ATA_DEV_PMP_UNSUP	= 6,	/* SATA port multiplier (unsupported) */
  	ATA_DEV_SEMB		= 7,	/* SEMB */
  	ATA_DEV_SEMB_UNSUP	= 8,	/* SEMB (unsupported) */
  	ATA_DEV_ZAC		= 9,	/* ZAC device */
  	ATA_DEV_ZAC_UNSUP	= 10,	/* ZAC device (unsupported) */
  	ATA_DEV_NONE		= 11,	/* no device */
  
  	/* struct ata_link flags */
  	ATA_LFLAG_NO_HRST	= (1 << 1), /* avoid hardreset */
  	ATA_LFLAG_NO_SRST	= (1 << 2), /* avoid softreset */
  	ATA_LFLAG_ASSUME_ATA	= (1 << 3), /* assume ATA class */
  	ATA_LFLAG_ASSUME_SEMB	= (1 << 4), /* assume SEMB class */
  	ATA_LFLAG_ASSUME_CLASS	= ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
  	ATA_LFLAG_NO_RETRY	= (1 << 5), /* don't retry this link */
  	ATA_LFLAG_DISABLED	= (1 << 6), /* link is disabled */
  	ATA_LFLAG_SW_ACTIVITY	= (1 << 7), /* keep activity stats */
  	ATA_LFLAG_NO_LPM	= (1 << 8), /* disable LPM on this link */
  	ATA_LFLAG_RST_ONCE	= (1 << 9), /* limit recovery to one reset */
  	ATA_LFLAG_CHANGED	= (1 << 10), /* LPM state changed on this link */
  	ATA_LFLAG_NO_DB_DELAY	= (1 << 11), /* no debounce delay on link resume */
  
  	/* struct ata_port flags */
  	ATA_FLAG_SLAVE_POSS	= (1 << 0), /* host supports slave dev */
  					    /* (doesn't imply presence) */
  	ATA_FLAG_SATA		= (1 << 1),
  	ATA_FLAG_NO_LPM		= (1 << 2), /* host not happy with LPM */
  	ATA_FLAG_NO_LOG_PAGE	= (1 << 5), /* do not issue log page read */
  	ATA_FLAG_NO_ATAPI	= (1 << 6), /* No ATAPI support */
  	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
  	ATA_FLAG_PIO_LBA48	= (1 << 8), /* Host DMA engine is LBA28 only */
  	ATA_FLAG_PIO_POLLING	= (1 << 9), /* use polling PIO if LLD
  					     * doesn't handle PIO interrupts */
  	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
  	ATA_FLAG_NO_POWEROFF_SPINDOWN = (1 << 11), /* don't spindown before poweroff */
  	ATA_FLAG_NO_HIBERNATE_SPINDOWN = (1 << 12), /* don't spindown before hibernation */
  	ATA_FLAG_DEBUGMSG	= (1 << 13),
  	ATA_FLAG_FPDMA_AA		= (1 << 14), /* driver supports Auto-Activate */
  	ATA_FLAG_IGN_SIMPLEX	= (1 << 15), /* ignore SIMPLEX */
  	ATA_FLAG_NO_IORDY	= (1 << 16), /* controller lacks iordy */
  	ATA_FLAG_ACPI_SATA	= (1 << 17), /* need native SATA ACPI layout */
  	ATA_FLAG_AN		= (1 << 18), /* controller supports AN */
  	ATA_FLAG_PMP		= (1 << 19), /* controller supports PMP */
  	ATA_FLAG_FPDMA_AUX	= (1 << 20), /* controller supports H2DFIS aux field */
  	ATA_FLAG_EM		= (1 << 21), /* driver supports enclosure
  					      * management */
  	ATA_FLAG_SW_ACTIVITY	= (1 << 22), /* driver supports sw activity
  					      * led */
  	ATA_FLAG_NO_DIPM	= (1 << 23), /* host not happy with DIPM */
  	ATA_FLAG_SAS_HOST	= (1 << 24), /* SAS host */
  
  	/* bits 24:31 of ap->flags are reserved for LLD specific flags */
  
  
  	/* struct ata_port pflags */
  	ATA_PFLAG_EH_PENDING	= (1 << 0), /* EH pending */
  	ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
  	ATA_PFLAG_FROZEN	= (1 << 2), /* port is frozen */
  	ATA_PFLAG_RECOVERED	= (1 << 3), /* recovery action performed */
  	ATA_PFLAG_LOADING	= (1 << 4), /* boot/loading probe */
  	ATA_PFLAG_SCSI_HOTPLUG	= (1 << 6), /* SCSI hotplug scheduled */
  	ATA_PFLAG_INITIALIZING	= (1 << 7), /* being initialized, don't touch */
  	ATA_PFLAG_RESETTING	= (1 << 8), /* reset in progress */
  	ATA_PFLAG_UNLOADING	= (1 << 9), /* driver is being unloaded */
  	ATA_PFLAG_UNLOADED	= (1 << 10), /* driver is unloaded */
  
  	ATA_PFLAG_SUSPENDED	= (1 << 17), /* port is suspended (power) */
  	ATA_PFLAG_PM_PENDING	= (1 << 18), /* PM operation pending */
  	ATA_PFLAG_INIT_GTM_VALID = (1 << 19), /* initial gtm data valid */
  
  	ATA_PFLAG_PIO32		= (1 << 20),  /* 32bit PIO */
  	ATA_PFLAG_PIO32CHANGE	= (1 << 21),  /* 32bit PIO can be turned on/off */
  	ATA_PFLAG_EXTERNAL	= (1 << 22),  /* eSATA/external port */
  
  	/* struct ata_queued_cmd flags */
  	ATA_QCFLAG_ACTIVE	= (1 << 0), /* cmd not yet ack'd to scsi lyer */
  	ATA_QCFLAG_DMAMAP	= (1 << 1), /* SG table is DMA mapped */
  	ATA_QCFLAG_IO		= (1 << 3), /* standard IO command */
  	ATA_QCFLAG_RESULT_TF	= (1 << 4), /* result TF requested */
  	ATA_QCFLAG_CLEAR_EXCL	= (1 << 5), /* clear excl_link on completion */
  	ATA_QCFLAG_QUIET	= (1 << 6), /* don't report device error */
  	ATA_QCFLAG_RETRY	= (1 << 7), /* retry after failure */
  
  	ATA_QCFLAG_FAILED	= (1 << 16), /* cmd failed and is owned by EH */
  	ATA_QCFLAG_SENSE_VALID	= (1 << 17), /* sense data valid */
  	ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
  
  	/* host set flags */
  	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
  	ATA_HOST_STARTED	= (1 << 1),	/* Host started */
  	ATA_HOST_PARALLEL_SCAN	= (1 << 2),	/* Ports on this host can be scanned in parallel */
  	ATA_HOST_IGNORE_ATA	= (1 << 3),	/* Ignore ATA devices on this host. */
  
  	/* bits 24:31 of host->flags are reserved for LLD specific flags */
  
  	/* various lengths of time */
  	ATA_TMOUT_BOOT		= 30000,	/* heuristic */
  	ATA_TMOUT_BOOT_QUICK	=  7000,	/* heuristic */
  	ATA_TMOUT_INTERNAL_QUICK = 5000,
  	ATA_TMOUT_MAX_PARK	= 30000,
  
  	/*
  	 * GoVault needs 2s and iVDR disk HHD424020F7SV00 800ms.  2s
  	 * is too much without parallel probing.  Use 2s if parallel
  	 * probing is available, 800ms otherwise.
  	 */
  	ATA_TMOUT_FF_WAIT_LONG	=  2000,
  	ATA_TMOUT_FF_WAIT	=   800,
  
  	/* Spec mandates to wait for ">= 2ms" before checking status
  	 * after reset.  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.
  	 *
  	 * Old drivers/ide uses the 2mS rule and then waits for ready.
  	 */
  	ATA_WAIT_AFTER_RESET	=  150,
  
  	/* If PMP is supported, we have to do follow-up SRST.  As some
  	 * PMPs don't send D2H Reg FIS after hardreset, LLDs are
  	 * advised to wait only for the following duration before
  	 * doing SRST.
  	 */
  	ATA_TMOUT_PMP_SRST_WAIT	= 5000,
  
  	/* When the LPM policy is set to ATA_LPM_MAX_POWER, there might
  	 * be a spurious PHY event, so ignore the first PHY event that
  	 * occurs within 10s after the policy change.
  	 */
  	ATA_TMOUT_SPURIOUS_PHY	= 10000,
  
  	/* ATA bus states */
  	BUS_UNKNOWN		= 0,
  	BUS_DMA			= 1,
  	BUS_IDLE		= 2,
  	BUS_NOINTR		= 3,
  	BUS_NODATA		= 4,
  	BUS_TIMER		= 5,
  	BUS_PIO			= 6,
  	BUS_EDD			= 7,
  	BUS_IDENTIFY		= 8,
  	BUS_PACKET		= 9,
  
  	/* SATA port states */
  	PORT_UNKNOWN		= 0,
  	PORT_ENABLED		= 1,
  	PORT_DISABLED		= 2,
  
  	/* encoding various smaller bitmaps into a single
  	 * unsigned long bitmap
  	 */
  	ATA_NR_PIO_MODES	= 7,
  	ATA_NR_MWDMA_MODES	= 5,
  	ATA_NR_UDMA_MODES	= 8,
  
  	ATA_SHIFT_PIO		= 0,
  	ATA_SHIFT_MWDMA		= ATA_SHIFT_PIO + ATA_NR_PIO_MODES,
  	ATA_SHIFT_UDMA		= ATA_SHIFT_MWDMA + ATA_NR_MWDMA_MODES,
  
  	/* size of buffer to pad xfers ending on unaligned boundaries */
  	ATA_DMA_PAD_SZ		= 4,
  
  	/* ering size */
  	ATA_ERING_SIZE		= 32,
  
  	/* return values for ->qc_defer */
  	ATA_DEFER_LINK		= 1,
  	ATA_DEFER_PORT		= 2,
  
  	/* desc_len for ata_eh_info and context */
  	ATA_EH_DESC_LEN		= 80,
  
  	/* reset / recovery action types */
  	ATA_EH_REVALIDATE	= (1 << 0),
  	ATA_EH_SOFTRESET	= (1 << 1), /* meaningful only in ->prereset */
  	ATA_EH_HARDRESET	= (1 << 2), /* meaningful only in ->prereset */
  	ATA_EH_RESET		= ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
  	ATA_EH_ENABLE_LINK	= (1 << 3),
  	ATA_EH_PARK		= (1 << 5), /* unload heads and stop I/O */
  
  	ATA_EH_PERDEV_MASK	= ATA_EH_REVALIDATE | ATA_EH_PARK,
  	ATA_EH_ALL_ACTIONS	= ATA_EH_REVALIDATE | ATA_EH_RESET |
  				  ATA_EH_ENABLE_LINK,
  
  	/* ata_eh_info->flags */
  	ATA_EHI_HOTPLUGGED	= (1 << 0),  /* could have been hotplugged */
  	ATA_EHI_NO_AUTOPSY	= (1 << 2),  /* no autopsy */
  	ATA_EHI_QUIET		= (1 << 3),  /* be quiet */
  	ATA_EHI_NO_RECOVERY	= (1 << 4),  /* no recovery */
  
  	ATA_EHI_DID_SOFTRESET	= (1 << 16), /* already soft-reset this port */
  	ATA_EHI_DID_HARDRESET	= (1 << 17), /* already soft-reset this port */
  	ATA_EHI_PRINTINFO	= (1 << 18), /* print configuration info */
  	ATA_EHI_SETMODE		= (1 << 19), /* configure transfer mode */
  	ATA_EHI_POST_SETMODE	= (1 << 20), /* revalidating after setmode */
  
  	ATA_EHI_DID_RESET	= ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,
  
  	/* mask of flags to transfer *to* the slave link */
  	ATA_EHI_TO_SLAVE_MASK	= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET,
  
  	/* max tries if error condition is still set after ->error_handler */
  	ATA_EH_MAX_TRIES	= 5,
  
  	/* sometimes resuming a link requires several retries */
  	ATA_LINK_RESUME_TRIES	= 5,
  
  	/* how hard are we gonna try to probe/recover devices */
  	ATA_PROBE_MAX_TRIES	= 3,
  	ATA_EH_DEV_TRIES	= 3,
  	ATA_EH_PMP_TRIES	= 5,
  	ATA_EH_PMP_LINK_TRIES	= 3,
  
  	SATA_PMP_RW_TIMEOUT	= 3000,		/* PMP read/write timeout */
  
  	/* This should match the actual table size of
  	 * ata_eh_cmd_timeout_table in libata-eh.c.
  	 */
  	ATA_EH_CMD_TIMEOUT_TABLE_SIZE = 6,
  
  	/* Horkage types. May be set by libata or controller on drives
  	   (some horkage may be drive/controller pair dependent */
  
  	ATA_HORKAGE_DIAGNOSTIC	= (1 << 0),	/* Failed boot diag */
  	ATA_HORKAGE_NODMA	= (1 << 1),	/* DMA problems */
  	ATA_HORKAGE_NONCQ	= (1 << 2),	/* Don't use NCQ */
  	ATA_HORKAGE_MAX_SEC_128	= (1 << 3),	/* Limit max sects to 128 */
  	ATA_HORKAGE_BROKEN_HPA	= (1 << 4),	/* Broken HPA */
  	ATA_HORKAGE_DISABLE	= (1 << 5),	/* Disable it */
  	ATA_HORKAGE_HPA_SIZE	= (1 << 6),	/* native size off by one */
  	ATA_HORKAGE_IVB		= (1 << 8),	/* cbl det validity bit bugs */
  	ATA_HORKAGE_STUCK_ERR	= (1 << 9),	/* stuck ERR on next PACKET */
  	ATA_HORKAGE_BRIDGE_OK	= (1 << 10),	/* no bridge limits */
  	ATA_HORKAGE_ATAPI_MOD16_DMA = (1 << 11), /* use ATAPI DMA for commands
  						    not multiple of 16 bytes */
  	ATA_HORKAGE_FIRMWARE_WARN = (1 << 12),	/* firmware update warning */
  	ATA_HORKAGE_1_5_GBPS	= (1 << 13),	/* force 1.5 Gbps */
  	ATA_HORKAGE_NOSETXFER	= (1 << 14),	/* skip SETXFER, SATA only */
  	ATA_HORKAGE_BROKEN_FPDMA_AA	= (1 << 15),	/* skip AA */
  	ATA_HORKAGE_DUMP_ID	= (1 << 16),	/* dump IDENTIFY data */
  	ATA_HORKAGE_MAX_SEC_LBA48 = (1 << 17),	/* Set max sects to 65535 */
  	ATA_HORKAGE_ATAPI_DMADIR = (1 << 18),	/* device requires dmadir */
  	ATA_HORKAGE_NO_NCQ_TRIM	= (1 << 19),	/* don't use queued TRIM */
  	ATA_HORKAGE_NOLPM	= (1 << 20),	/* don't use LPM */
  	ATA_HORKAGE_WD_BROKEN_LPM = (1 << 21),	/* some WDs have broken LPM */
  	ATA_HORKAGE_ZERO_AFTER_TRIM = (1 << 22),/* guarantees zero after trim */
  	ATA_HORKAGE_NO_NCQ_LOG	= (1 << 23),	/* don't use NCQ for log read */
  	ATA_HORKAGE_NOTRIM	= (1 << 24),	/* don't use TRIM */
  	ATA_HORKAGE_MAX_SEC_1024 = (1 << 25),	/* Limit max sects to 1024 */
  
  	 /* DMA mask for user DMA control: User visible values; DO NOT
  	    renumber */
  	ATA_DMA_MASK_ATA	= (1 << 0),	/* DMA on ATA Disk */
  	ATA_DMA_MASK_ATAPI	= (1 << 1),	/* DMA on ATAPI */
  	ATA_DMA_MASK_CFA	= (1 << 2),	/* DMA on CF Card */
  
  	/* ATAPI command types */
  	ATAPI_READ		= 0,		/* READs */
  	ATAPI_WRITE		= 1,		/* WRITEs */
  	ATAPI_READ_CD		= 2,		/* READ CD [MSF] */
  	ATAPI_PASS_THRU		= 3,		/* SAT pass-thru */
  	ATAPI_MISC		= 4,		/* the rest */
  
  	/* Timing constants */
  	ATA_TIMING_SETUP	= (1 << 0),
  	ATA_TIMING_ACT8B	= (1 << 1),
  	ATA_TIMING_REC8B	= (1 << 2),
  	ATA_TIMING_CYC8B	= (1 << 3),
  	ATA_TIMING_8BIT		= ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
  				  ATA_TIMING_CYC8B,
  	ATA_TIMING_ACTIVE	= (1 << 4),
  	ATA_TIMING_RECOVER	= (1 << 5),
  	ATA_TIMING_DMACK_HOLD	= (1 << 6),
  	ATA_TIMING_CYCLE	= (1 << 7),
  	ATA_TIMING_UDMA		= (1 << 8),
  	ATA_TIMING_ALL		= ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
  				  ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
  				  ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
  				  ATA_TIMING_DMACK_HOLD | ATA_TIMING_CYCLE |
  				  ATA_TIMING_UDMA,
  
  	/* ACPI constants */
  	ATA_ACPI_FILTER_SETXFER	= 1 << 0,
  	ATA_ACPI_FILTER_LOCK	= 1 << 1,
  	ATA_ACPI_FILTER_DIPM	= 1 << 2,
  	ATA_ACPI_FILTER_FPDMA_OFFSET = 1 << 3,	/* FPDMA non-zero offset */
  	ATA_ACPI_FILTER_FPDMA_AA = 1 << 4,	/* FPDMA auto activate */
  
  	ATA_ACPI_FILTER_DEFAULT	= ATA_ACPI_FILTER_SETXFER |
  				  ATA_ACPI_FILTER_LOCK |
  				  ATA_ACPI_FILTER_DIPM,
  };
  
  enum ata_xfer_mask {
  	ATA_MASK_PIO		= ((1LU << ATA_NR_PIO_MODES) - 1)
  					<< ATA_SHIFT_PIO,
  	ATA_MASK_MWDMA		= ((1LU << ATA_NR_MWDMA_MODES) - 1)
  					<< ATA_SHIFT_MWDMA,
  	ATA_MASK_UDMA		= ((1LU << ATA_NR_UDMA_MODES) - 1)
  					<< ATA_SHIFT_UDMA,
  };
  
  enum hsm_task_states {
  	HSM_ST_IDLE,		/* no command on going */
  	HSM_ST_FIRST,		/* (waiting the device to)
  				   write CDB or first data block */
  	HSM_ST,			/* (waiting the device to) transfer data */
  	HSM_ST_LAST,		/* (waiting the device to) complete command */
  	HSM_ST_ERR,		/* error */
  };
  
  enum ata_completion_errors {
  	AC_ERR_DEV		= (1 << 0), /* device reported error */
  	AC_ERR_HSM		= (1 << 1), /* host state machine violation */
  	AC_ERR_TIMEOUT		= (1 << 2), /* timeout */
  	AC_ERR_MEDIA		= (1 << 3), /* media error */
  	AC_ERR_ATA_BUS		= (1 << 4), /* ATA bus error */
  	AC_ERR_HOST_BUS		= (1 << 5), /* host bus error */
  	AC_ERR_SYSTEM		= (1 << 6), /* system error */
  	AC_ERR_INVALID		= (1 << 7), /* invalid argument */
  	AC_ERR_OTHER		= (1 << 8), /* unknown */
  	AC_ERR_NODEV_HINT	= (1 << 9), /* polling device detection hint */
  	AC_ERR_NCQ		= (1 << 10), /* marker for offending NCQ qc */
  };
  
  /*
   * Link power management policy: If you alter this, you also need to
   * alter libata-scsi.c (for the ascii descriptions)
   */
  enum ata_lpm_policy {
  	ATA_LPM_UNKNOWN,
  	ATA_LPM_MAX_POWER,
  	ATA_LPM_MED_POWER,
  	ATA_LPM_MIN_POWER,
  };
  
  enum ata_lpm_hints {
  	ATA_LPM_EMPTY		= (1 << 0), /* port empty/probing */
  	ATA_LPM_HIPM		= (1 << 1), /* may use HIPM */
  	ATA_LPM_WAKE_ONLY	= (1 << 2), /* only wake up link */
  };
  
  /* forward declarations */
  struct scsi_device;
  struct ata_port_operations;
  struct ata_port;
  struct ata_link;
  struct ata_queued_cmd;
  
  /* typedefs */
  typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
  typedef int (*ata_prereset_fn_t)(struct ata_link *link, unsigned long deadline);
  typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
  			      unsigned long deadline);
  typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);
  
  extern struct device_attribute dev_attr_link_power_management_policy;
  extern struct device_attribute dev_attr_unload_heads;
  extern struct device_attribute dev_attr_em_message_type;
  extern struct device_attribute dev_attr_em_message;
  extern struct device_attribute dev_attr_sw_activity;
  
  enum sw_activity {
  	OFF,
  	BLINK_ON,
  	BLINK_OFF,
  };
  
  struct ata_taskfile {
  	unsigned long		flags;		/* ATA_TFLAG_xxx */
  	u8			protocol;	/* ATA_PROT_xxx */
  
  	u8			ctl;		/* control reg */
  
  	u8			hob_feature;	/* additional data */
  	u8			hob_nsect;	/* to support LBA48 */
  	u8			hob_lbal;
  	u8			hob_lbam;
  	u8			hob_lbah;
  
  	u8			feature;
  	u8			nsect;
  	u8			lbal;
  	u8			lbam;
  	u8			lbah;
  
  	u8			device;
  
  	u8			command;	/* IO operation */
  
  	u32			auxiliary;	/* auxiliary field */
  						/* from SATA 3.1 and */
  						/* ATA-8 ACS-3 */
  };
  
  #ifdef CONFIG_ATA_SFF
  struct ata_ioports {
  	void __iomem		*cmd_addr;
  	void __iomem		*data_addr;
  	void __iomem		*error_addr;
  	void __iomem		*feature_addr;
  	void __iomem		*nsect_addr;
  	void __iomem		*lbal_addr;
  	void __iomem		*lbam_addr;
  	void __iomem		*lbah_addr;
  	void __iomem		*device_addr;
  	void __iomem		*status_addr;
  	void __iomem		*command_addr;
  	void __iomem		*altstatus_addr;
  	void __iomem		*ctl_addr;
  #ifdef CONFIG_ATA_BMDMA
  	void __iomem		*bmdma_addr;
  #endif /* CONFIG_ATA_BMDMA */
  	void __iomem		*scr_addr;
  };
  #endif /* CONFIG_ATA_SFF */
  
  struct ata_host {
  	spinlock_t		lock;
  	struct device 		*dev;
  	void __iomem * const	*iomap;
  	unsigned int		n_ports;
  	unsigned int		n_tags;			/* nr of NCQ tags */
  	void			*private_data;
  	struct ata_port_operations *ops;
  	unsigned long		flags;
  
  	struct mutex		eh_mutex;
  	struct task_struct	*eh_owner;
  
  	struct ata_port		*simplex_claimed;	/* channel owning the DMA */
  	struct ata_port		*ports[0];
  };
  
  struct ata_queued_cmd {
  	struct ata_port		*ap;
  	struct ata_device	*dev;
  
  	struct scsi_cmnd	*scsicmd;
  	void			(*scsidone)(struct scsi_cmnd *);
  
  	struct ata_taskfile	tf;
  	u8			cdb[ATAPI_CDB_LEN];
  
  	unsigned long		flags;		/* ATA_QCFLAG_xxx */
  	unsigned int		tag;
  	unsigned int		n_elem;
  	unsigned int		orig_n_elem;
  
  	int			dma_dir;
  
  	unsigned int		sect_size;
  
  	unsigned int		nbytes;
  	unsigned int		extrabytes;
  	unsigned int		curbytes;
  
  	struct scatterlist	sgent;
  
  	struct scatterlist	*sg;
  
  	struct scatterlist	*cursg;
  	unsigned int		cursg_ofs;
  
  	unsigned int		err_mask;
  	struct ata_taskfile	result_tf;
  	ata_qc_cb_t		complete_fn;
  
  	void			*private_data;
  	void			*lldd_task;
  };
  
  struct ata_port_stats {
  	unsigned long		unhandled_irq;
  	unsigned long		idle_irq;
  	unsigned long		rw_reqbuf;
  };
  
  struct ata_ering_entry {
  	unsigned int		eflags;
  	unsigned int		err_mask;
  	u64			timestamp;
  };
  
  struct ata_ering {
  	int			cursor;
  	struct ata_ering_entry	ring[ATA_ERING_SIZE];
  };
  
  struct ata_device {
  	struct ata_link		*link;
  	unsigned int		devno;		/* 0 or 1 */
  	unsigned int		horkage;	/* List of broken features */
  	unsigned long		flags;		/* ATA_DFLAG_xxx */
  	struct scsi_device	*sdev;		/* attached SCSI device */
  	void			*private_data;
  #ifdef CONFIG_ATA_ACPI
  	union acpi_object	*gtf_cache;
  	unsigned int		gtf_filter;
  #endif
  #ifdef CONFIG_SATA_ZPODD
  	void			*zpodd;
  #endif
  	struct device		tdev;
  	/* n_sector is CLEAR_BEGIN, read comment above CLEAR_BEGIN */
  	u64			n_sectors;	/* size of device, if ATA */
  	u64			n_native_sectors; /* native size, if ATA */
  	unsigned int		class;		/* ATA_DEV_xxx */
  	unsigned long		unpark_deadline;
  
  	u8			pio_mode;
  	u8			dma_mode;
  	u8			xfer_mode;
  	unsigned int		xfer_shift;	/* ATA_SHIFT_xxx */
  
  	unsigned int		multi_count;	/* sectors count for
  						   READ/WRITE MULTIPLE */
  	unsigned int		max_sectors;	/* per-device max sectors */
  	unsigned int		cdb_len;
  
  	/* per-dev xfer mask */
  	unsigned long		pio_mask;
  	unsigned long		mwdma_mask;
  	unsigned long		udma_mask;
  
  	/* for CHS addressing */
  	u16			cylinders;	/* Number of cylinders */
  	u16			heads;		/* Number of heads */
  	u16			sectors;	/* Number of sectors per track */
  
  	union {
  		u16		id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
  		u32		gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
  	} ____cacheline_aligned;
  
  	/* DEVSLP Timing Variables from Identify Device Data Log */
  	u8			devslp_timing[ATA_LOG_DEVSLP_SIZE];
  
  	/* NCQ send and receive log subcommand support */
  	u8			ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_SIZE];
  	u8			ncq_non_data_cmds[ATA_LOG_NCQ_NON_DATA_SIZE];
  
  	/* ZAC zone configuration */
  	u32			zac_zoned_cap;
  	u32			zac_zones_optimal_open;
  	u32			zac_zones_optimal_nonseq;
  	u32			zac_zones_max_open;
  
  	/* error history */
  	int			spdn_cnt;
  	/* ering is CLEAR_END, read comment above CLEAR_END */
  	struct ata_ering	ering;
  };
  
  /* Fields between ATA_DEVICE_CLEAR_BEGIN and ATA_DEVICE_CLEAR_END are
   * cleared to zero on ata_dev_init().
   */
  #define ATA_DEVICE_CLEAR_BEGIN		offsetof(struct ata_device, n_sectors)
  #define ATA_DEVICE_CLEAR_END		offsetof(struct ata_device, ering)
  
  struct ata_eh_info {
  	struct ata_device	*dev;		/* offending device */
  	u32			serror;		/* SError from LLDD */
  	unsigned int		err_mask;	/* port-wide err_mask */
  	unsigned int		action;		/* ATA_EH_* action mask */
  	unsigned int		dev_action[ATA_MAX_DEVICES]; /* dev EH action */
  	unsigned int		flags;		/* ATA_EHI_* flags */
  
  	unsigned int		probe_mask;
  
  	char			desc[ATA_EH_DESC_LEN];
  	int			desc_len;
  };
  
  struct ata_eh_context {
  	struct ata_eh_info	i;
  	int			tries[ATA_MAX_DEVICES];
  	int			cmd_timeout_idx[ATA_MAX_DEVICES]
  					       [ATA_EH_CMD_TIMEOUT_TABLE_SIZE];
  	unsigned int		classes[ATA_MAX_DEVICES];
  	unsigned int		did_probe_mask;
  	unsigned int		unloaded_mask;
  	unsigned int		saved_ncq_enabled;
  	u8			saved_xfer_mode[ATA_MAX_DEVICES];
  	/* timestamp for the last reset attempt or success */
  	unsigned long		last_reset;
  };
  
  struct ata_acpi_drive
  {
  	u32 pio;
  	u32 dma;
  } __packed;
  
  struct ata_acpi_gtm {
  	struct ata_acpi_drive drive[2];
  	u32 flags;
  } __packed;
  
  struct ata_link {
  	struct ata_port		*ap;
  	int			pmp;		/* port multiplier port # */
  
  	struct device		tdev;
  	unsigned int		active_tag;	/* active tag on this link */
  	u32			sactive;	/* active NCQ commands */
  
  	unsigned int		flags;		/* ATA_LFLAG_xxx */
  
  	u32			saved_scontrol;	/* SControl on probe */
  	unsigned int		hw_sata_spd_limit;
  	unsigned int		sata_spd_limit;
  	unsigned int		sata_spd;	/* current SATA PHY speed */
  	enum ata_lpm_policy	lpm_policy;
  
  	/* record runtime error info, protected by host_set lock */
  	struct ata_eh_info	eh_info;
  	/* EH context */
  	struct ata_eh_context	eh_context;
  
  	struct ata_device	device[ATA_MAX_DEVICES];
  
  	unsigned long		last_lpm_change; /* when last LPM change happened */
  };
  #define ATA_LINK_CLEAR_BEGIN		offsetof(struct ata_link, active_tag)
  #define ATA_LINK_CLEAR_END		offsetof(struct ata_link, device[0])
  
  struct ata_port {
  	struct Scsi_Host	*scsi_host; /* our co-allocated scsi host */
  	struct ata_port_operations *ops;
  	spinlock_t		*lock;
  	/* Flags owned by the EH context. Only EH should touch these once the
  	   port is active */
  	unsigned long		flags;	/* ATA_FLAG_xxx */
  	/* Flags that change dynamically, protected by ap->lock */
  	unsigned int		pflags; /* ATA_PFLAG_xxx */
  	unsigned int		print_id; /* user visible unique port ID */
  	unsigned int            local_port_no; /* host local port num */
  	unsigned int		port_no; /* 0 based port no. inside the host */
  
  #ifdef CONFIG_ATA_SFF
  	struct ata_ioports	ioaddr;	/* ATA cmd/ctl/dma register blocks */
  	u8			ctl;	/* cache of ATA control register */
  	u8			last_ctl;	/* Cache last written value */
  	struct ata_link*	sff_pio_task_link; /* link currently used */
  	struct delayed_work	sff_pio_task;
  #ifdef CONFIG_ATA_BMDMA
  	struct ata_bmdma_prd	*bmdma_prd;	/* BMDMA SG list */
  	dma_addr_t		bmdma_prd_dma;	/* and its DMA mapping */
  #endif /* CONFIG_ATA_BMDMA */
  #endif /* CONFIG_ATA_SFF */
  
  	unsigned int		pio_mask;
  	unsigned int		mwdma_mask;
  	unsigned int		udma_mask;
  	unsigned int		cbl;	/* cable type; ATA_CBL_xxx */
  
  	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
  	unsigned long		sas_tag_allocated; /* for sas tag allocation only */
  	unsigned int		qc_active;
  	int			nr_active_links; /* #links with active qcs */
  	unsigned int		sas_last_tag;	/* track next tag hw expects */
  
  	struct ata_link		link;		/* host default link */
  	struct ata_link		*slave_link;	/* see ata_slave_link_init() */
  
  	int			nr_pmp_links;	/* nr of available PMP links */
  	struct ata_link		*pmp_link;	/* array of PMP links */
  	struct ata_link		*excl_link;	/* for PMP qc exclusion */
  
  	struct ata_port_stats	stats;
  	struct ata_host		*host;
  	struct device 		*dev;
  	struct device		tdev;
  
  	struct mutex		scsi_scan_mutex;
  	struct delayed_work	hotplug_task;
  	struct work_struct	scsi_rescan_task;
  
  	unsigned int		hsm_task_state;
  
  	u32			msg_enable;
  	struct list_head	eh_done_q;
  	wait_queue_head_t	eh_wait_q;
  	int			eh_tries;
  	struct completion	park_req_pending;
  
  	pm_message_t		pm_mesg;
  	enum ata_lpm_policy	target_lpm_policy;
  
  	struct timer_list	fastdrain_timer;
  	unsigned long		fastdrain_cnt;
  
  	int			em_message_type;
  	void			*private_data;
  
  #ifdef CONFIG_ATA_ACPI
  	struct ata_acpi_gtm	__acpi_init_gtm; /* use ata_acpi_init_gtm() */
  #endif
  	/* owned by EH */
  	u8			sector_buf[ATA_SECT_SIZE] ____cacheline_aligned;
  };
  
  /* The following initializer overrides a method to NULL whether one of
   * its parent has the method defined or not.  This is equivalent to
   * ERR_PTR(-ENOENT).  Unfortunately, ERR_PTR doesn't render a constant
   * expression and thus can't be used as an initializer.
   */
  #define ATA_OP_NULL		(void *)(unsigned long)(-ENOENT)
  
  struct ata_port_operations {
  	/*
  	 * Command execution
  	 */
  	int  (*qc_defer)(struct ata_queued_cmd *qc);
  	int  (*check_atapi_dma)(struct ata_queued_cmd *qc);
  	void (*qc_prep)(struct ata_queued_cmd *qc);
  	unsigned int (*qc_issue)(struct ata_queued_cmd *qc);
  	bool (*qc_fill_rtf)(struct ata_queued_cmd *qc);
  
  	/*
  	 * Configuration and exception handling
  	 */
  	int  (*cable_detect)(struct ata_port *ap);
  	unsigned long (*mode_filter)(struct ata_device *dev, unsigned long xfer_mask);
  	void (*set_piomode)(struct ata_port *ap, struct ata_device *dev);
  	void (*set_dmamode)(struct ata_port *ap, struct ata_device *dev);
  	int  (*set_mode)(struct ata_link *link, struct ata_device **r_failed_dev);
  	unsigned int (*read_id)(struct ata_device *dev, struct ata_taskfile *tf, u16 *id);
  
  	void (*dev_config)(struct ata_device *dev);
  
  	void (*freeze)(struct ata_port *ap);
  	void (*thaw)(struct ata_port *ap);
  	ata_prereset_fn_t	prereset;
  	ata_reset_fn_t		softreset;
  	ata_reset_fn_t		hardreset;
  	ata_postreset_fn_t	postreset;
  	ata_prereset_fn_t	pmp_prereset;
  	ata_reset_fn_t		pmp_softreset;
  	ata_reset_fn_t		pmp_hardreset;
  	ata_postreset_fn_t	pmp_postreset;
  	void (*error_handler)(struct ata_port *ap);
  	void (*lost_interrupt)(struct ata_port *ap);
  	void (*post_internal_cmd)(struct ata_queued_cmd *qc);
  	void (*sched_eh)(struct ata_port *ap);
  	void (*end_eh)(struct ata_port *ap);
  
  	/*
  	 * Optional features
  	 */
  	int  (*scr_read)(struct ata_link *link, unsigned int sc_reg, u32 *val);
  	int  (*scr_write)(struct ata_link *link, unsigned int sc_reg, u32 val);
  	void (*pmp_attach)(struct ata_port *ap);
  	void (*pmp_detach)(struct ata_port *ap);
  	int  (*set_lpm)(struct ata_link *link, enum ata_lpm_policy policy,
  			unsigned hints);
  
  	/*
  	 * Start, stop, suspend and resume
  	 */
  	int  (*port_suspend)(struct ata_port *ap, pm_message_t mesg);
  	int  (*port_resume)(struct ata_port *ap);
  	int  (*port_start)(struct ata_port *ap);
  	void (*port_stop)(struct ata_port *ap);
  	void (*host_stop)(struct ata_host *host);
  
  #ifdef CONFIG_ATA_SFF
  	/*
  	 * SFF / taskfile oriented ops
  	 */
  	void (*sff_dev_select)(struct ata_port *ap, unsigned int device);
  	void (*sff_set_devctl)(struct ata_port *ap, u8 ctl);
  	u8   (*sff_check_status)(struct ata_port *ap);
  	u8   (*sff_check_altstatus)(struct ata_port *ap);
  	void (*sff_tf_load)(struct ata_port *ap, const struct ata_taskfile *tf);
  	void (*sff_tf_read)(struct ata_port *ap, struct ata_taskfile *tf);
  	void (*sff_exec_command)(struct ata_port *ap,
  				 const struct ata_taskfile *tf);
  	unsigned int (*sff_data_xfer)(struct ata_device *dev,
  			unsigned char *buf, unsigned int buflen, int rw);
  	void (*sff_irq_on)(struct ata_port *);
  	bool (*sff_irq_check)(struct ata_port *);
  	void (*sff_irq_clear)(struct ata_port *);
  	void (*sff_drain_fifo)(struct ata_queued_cmd *qc);
  
  #ifdef CONFIG_ATA_BMDMA
  	void (*bmdma_setup)(struct ata_queued_cmd *qc);
  	void (*bmdma_start)(struct ata_queued_cmd *qc);
  	void (*bmdma_stop)(struct ata_queued_cmd *qc);
  	u8   (*bmdma_status)(struct ata_port *ap);
  #endif /* CONFIG_ATA_BMDMA */
  #endif /* CONFIG_ATA_SFF */
  
  	ssize_t (*em_show)(struct ata_port *ap, char *buf);
  	ssize_t (*em_store)(struct ata_port *ap, const char *message,
  			    size_t size);
  	ssize_t (*sw_activity_show)(struct ata_device *dev, char *buf);
  	ssize_t (*sw_activity_store)(struct ata_device *dev,
  				     enum sw_activity val);
  	ssize_t (*transmit_led_message)(struct ata_port *ap, u32 state,
  					ssize_t size);
  
  	/*
  	 * Obsolete
  	 */
  	void (*phy_reset)(struct ata_port *ap);
  	void (*eng_timeout)(struct ata_port *ap);
  
  	/*
  	 * ->inherits must be the last field and all the preceding
  	 * fields must be pointers.
  	 */
  	const struct ata_port_operations	*inherits;
  };
  
  struct ata_port_info {
  	unsigned long		flags;
  	unsigned long		link_flags;
  	unsigned long		pio_mask;
  	unsigned long		mwdma_mask;
  	unsigned long		udma_mask;
  	struct ata_port_operations *port_ops;
  	void 			*private_data;
  };
  
  struct ata_timing {
  	unsigned short mode;		/* ATA mode */
  	unsigned short setup;		/* t1 */
  	unsigned short act8b;		/* t2 for 8-bit I/O */
  	unsigned short rec8b;		/* t2i for 8-bit I/O */
  	unsigned short cyc8b;		/* t0 for 8-bit I/O */
  	unsigned short active;		/* t2 or tD */
  	unsigned short recover;		/* t2i or tK */
  	unsigned short dmack_hold;	/* tj */
  	unsigned short cycle;		/* t0 */
  	unsigned short udma;		/* t2CYCTYP/2 */
  };
  
  /*
   * Core layer - drivers/ata/libata-core.c
   */
  extern const unsigned long sata_deb_timing_normal[];
  extern const unsigned long sata_deb_timing_hotplug[];
  extern const unsigned long sata_deb_timing_long[];
  
  extern struct ata_port_operations ata_dummy_port_ops;
  extern const struct ata_port_info ata_dummy_port_info;
  
  static inline bool ata_is_atapi(u8 prot)
  {
  	return prot & ATA_PROT_FLAG_ATAPI;
  }
  
  static inline bool ata_is_pio(u8 prot)
  {
  	return prot & ATA_PROT_FLAG_PIO;
  }
  
  static inline bool ata_is_dma(u8 prot)
  {
  	return prot & ATA_PROT_FLAG_DMA;
  }
  
  static inline bool ata_is_ncq(u8 prot)
  {
  	return prot & ATA_PROT_FLAG_NCQ;
  }
  
  static inline bool ata_is_data(u8 prot)
  {
  	return prot & (ATA_PROT_FLAG_PIO | ATA_PROT_FLAG_DMA);
  }
  
  static inline int is_multi_taskfile(struct ata_taskfile *tf)
  {
  	return (tf->command == ATA_CMD_READ_MULTI) ||
  	       (tf->command == ATA_CMD_WRITE_MULTI) ||
  	       (tf->command == ATA_CMD_READ_MULTI_EXT) ||
  	       (tf->command == ATA_CMD_WRITE_MULTI_EXT) ||
  	       (tf->command == ATA_CMD_WRITE_MULTI_FUA_EXT);
  }
  
  static inline const unsigned long *
  sata_ehc_deb_timing(struct ata_eh_context *ehc)
  {
  	if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
  		return sata_deb_timing_hotplug;
  	else
  		return sata_deb_timing_normal;
  }
  
  static inline int ata_port_is_dummy(struct ata_port *ap)
  {
  	return ap->ops == &ata_dummy_port_ops;
  }
  
  extern int sata_set_spd(struct ata_link *link);
  extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
  extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
  				int (*check_ready)(struct ata_link *link));
  extern int sata_link_debounce(struct ata_link *link,
  			const unsigned long *params, unsigned long deadline);
  extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
  			    unsigned long deadline);
  extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
  			     bool spm_wakeup);
  extern int sata_link_hardreset(struct ata_link *link,
  			const unsigned long *timing, unsigned long deadline,
  			bool *online, int (*check_ready)(struct ata_link *));
  extern int sata_std_hardreset(struct ata_link *link, unsigned int *class,
  			      unsigned long deadline);
  extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
  
  extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
  extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
  			const struct ata_port_info * const * ppi, int n_ports);
  extern int ata_slave_link_init(struct ata_port *ap);
  extern int ata_host_start(struct ata_host *host);
  extern int ata_host_register(struct ata_host *host,
  			     struct scsi_host_template *sht);
  extern int ata_host_activate(struct ata_host *host, int irq,
  			     irq_handler_t irq_handler, unsigned long irq_flags,
  			     struct scsi_host_template *sht);
  extern void ata_host_detach(struct ata_host *host);
  extern void ata_host_init(struct ata_host *, struct device *, struct ata_port_operations *);
  extern int ata_scsi_detect(struct scsi_host_template *sht);
  extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
  extern int ata_scsi_queuecmd(struct Scsi_Host *h, struct scsi_cmnd *cmd);
  extern int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *dev,
  			    int cmd, void __user *arg);
  extern void ata_sas_port_destroy(struct ata_port *);
  extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
  					   struct ata_port_info *, struct Scsi_Host *);
  extern void ata_sas_async_probe(struct ata_port *ap);
  extern int ata_sas_sync_probe(struct ata_port *ap);
  extern int ata_sas_port_init(struct ata_port *);
  extern int ata_sas_port_start(struct ata_port *ap);
  extern void ata_sas_port_stop(struct ata_port *ap);
  extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
  extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
  extern int sata_scr_valid(struct ata_link *link);
  extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
  extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
  extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
  extern bool ata_link_online(struct ata_link *link);
  extern bool ata_link_offline(struct ata_link *link);
  #ifdef CONFIG_PM
  extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
  extern void ata_host_resume(struct ata_host *host);
  extern void ata_sas_port_suspend(struct ata_port *ap);
  extern void ata_sas_port_resume(struct ata_port *ap);
  #else
  static inline void ata_sas_port_suspend(struct ata_port *ap)
  {
  }
  static inline void ata_sas_port_resume(struct ata_port *ap)
  {
  }
  #endif
  extern int ata_ratelimit(void);
  extern void ata_msleep(struct ata_port *ap, unsigned int msecs);
  extern u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask,
  			u32 val, unsigned long interval, unsigned long timeout);
  extern int atapi_cmd_type(u8 opcode);
  extern void ata_tf_to_fis(const struct ata_taskfile *tf,
  			  u8 pmp, int is_cmd, u8 *fis);
  extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
  extern unsigned long ata_pack_xfermask(unsigned long pio_mask,
  			unsigned long mwdma_mask, unsigned long udma_mask);
  extern void ata_unpack_xfermask(unsigned long xfer_mask,
  			unsigned long *pio_mask, unsigned long *mwdma_mask,
  			unsigned long *udma_mask);
  extern u8 ata_xfer_mask2mode(unsigned long xfer_mask);
  extern unsigned long ata_xfer_mode2mask(u8 xfer_mode);
  extern int ata_xfer_mode2shift(unsigned long xfer_mode);
  extern const char *ata_mode_string(unsigned long xfer_mask);
  extern unsigned long ata_id_xfermask(const u16 *id);
  extern int ata_std_qc_defer(struct ata_queued_cmd *qc);
  extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
  extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
  		 unsigned int n_elem);
  extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
  extern void ata_dev_disable(struct ata_device *adev);
  extern void ata_id_string(const u16 *id, unsigned char *s,
  			  unsigned int ofs, unsigned int len);
  extern void ata_id_c_string(const u16 *id, unsigned char *s,
  			    unsigned int ofs, unsigned int len);
  extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
  					struct ata_taskfile *tf, u16 *id);
  extern void ata_qc_complete(struct ata_queued_cmd *qc);
  extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active);
  extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);
  extern int ata_std_bios_param(struct scsi_device *sdev,
  			      struct block_device *bdev,
  			      sector_t capacity, int geom[]);
  extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
  extern int ata_scsi_slave_config(struct scsi_device *sdev);
  extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
  extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
  				       int queue_depth);
  extern int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
  				    int queue_depth);
  extern struct ata_device *ata_dev_pair(struct ata_device *adev);
  extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
  extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
  extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
  extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
  
  extern int ata_cable_40wire(struct ata_port *ap);
  extern int ata_cable_80wire(struct ata_port *ap);
  extern int ata_cable_sata(struct ata_port *ap);
  extern int ata_cable_ignore(struct ata_port *ap);
  extern int ata_cable_unknown(struct ata_port *ap);
  
  /* Timing helpers */
  extern unsigned int ata_pio_need_iordy(const struct ata_device *);
  extern const struct ata_timing *ata_timing_find_mode(u8 xfer_mode);
  extern int ata_timing_compute(struct ata_device *, unsigned short,
  			      struct ata_timing *, int, int);
  extern void ata_timing_merge(const struct ata_timing *,
  			     const struct ata_timing *, struct ata_timing *,
  			     unsigned int);
  extern u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle);
  
  /* PCI */
  #ifdef CONFIG_PCI
  struct pci_dev;
  
  struct pci_bits {
  	unsigned int		reg;	/* PCI config register to read */
  	unsigned int		width;	/* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
  	unsigned long		mask;
  	unsigned long		val;
  };
  
  extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
  extern void ata_pci_shutdown_one(struct pci_dev *pdev);
  extern void ata_pci_remove_one(struct pci_dev *pdev);
  
  #ifdef CONFIG_PM
  extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
  extern int __must_check ata_pci_device_do_resume(struct pci_dev *pdev);
  extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
  extern int ata_pci_device_resume(struct pci_dev *pdev);
  #endif /* CONFIG_PM */
  #endif /* CONFIG_PCI */
  
  struct platform_device;
  
  extern int ata_platform_remove_one(struct platform_device *pdev);
  
  /*
   * ACPI - drivers/ata/libata-acpi.c
   */
  #ifdef CONFIG_ATA_ACPI
  static inline const struct ata_acpi_gtm *ata_acpi_init_gtm(struct ata_port *ap)
  {
  	if (ap->pflags & ATA_PFLAG_INIT_GTM_VALID)
  		return &ap->__acpi_init_gtm;
  	return NULL;
  }
  int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm);
  int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *stm);
  unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
  				    const struct ata_acpi_gtm *gtm);
  int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm);
  #else
  static inline const struct ata_acpi_gtm *ata_acpi_init_gtm(struct ata_port *ap)
  {
  	return NULL;
  }
  
  static inline int ata_acpi_stm(const struct ata_port *ap,
  			       struct ata_acpi_gtm *stm)
  {
  	return -ENOSYS;
  }
  
  static inline int ata_acpi_gtm(const struct ata_port *ap,
  			       struct ata_acpi_gtm *stm)
  {
  	return -ENOSYS;
  }
  
  static inline unsigned int ata_acpi_gtm_xfermask(struct ata_device *dev,
  					const struct ata_acpi_gtm *gtm)
  {
  	return 0;
  }
  
  static inline int ata_acpi_cbl_80wire(struct ata_port *ap,
  				      const struct ata_acpi_gtm *gtm)
  {
  	return 0;
  }
  #endif
  
  /*
   * EH - drivers/ata/libata-eh.c
   */
  extern void ata_port_schedule_eh(struct ata_port *ap);
  extern void ata_port_wait_eh(struct ata_port *ap);
  extern int ata_link_abort(struct ata_link *link);
  extern int ata_port_abort(struct ata_port *ap);
  extern int ata_port_freeze(struct ata_port *ap);
  extern int sata_async_notification(struct ata_port *ap);
  
  extern void ata_eh_freeze_port(struct ata_port *ap);
  extern void ata_eh_thaw_port(struct ata_port *ap);
  
  extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
  extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
  extern void ata_eh_analyze_ncq_error(struct ata_link *link);
  
  extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
  		      ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
  		      ata_postreset_fn_t postreset);
  extern void ata_std_error_handler(struct ata_port *ap);
  extern void ata_std_sched_eh(struct ata_port *ap);
  extern void ata_std_end_eh(struct ata_port *ap);
  extern int ata_link_nr_enabled(struct ata_link *link);
  
  /*
   * Base operations to inherit from and initializers for sht
   *
   * Operations
   *
   * base  : Common to all libata drivers.
   * sata  : SATA controllers w/ native interface.
   * pmp   : SATA controllers w/ PMP support.
   * sff   : SFF ATA controllers w/o BMDMA support.
   * bmdma : SFF ATA controllers w/ BMDMA support.
   *
   * sht initializers
   *
   * BASE  : Common to all libata drivers.  The user must set
   *	   sg_tablesize and dma_boundary.
   * PIO   : SFF ATA controllers w/ only PIO support.
   * BMDMA : SFF ATA controllers w/ BMDMA support.  sg_tablesize and
   *	   dma_boundary are set to BMDMA limits.
   * NCQ   : SATA controllers supporting NCQ.  The user must set
   *	   sg_tablesize, dma_boundary and can_queue.
   */
  extern const struct ata_port_operations ata_base_port_ops;
  extern const struct ata_port_operations sata_port_ops;
  extern struct device_attribute *ata_common_sdev_attrs[];
  
  /*
   * All sht initializers (BASE, PIO, BMDMA, NCQ) must be instantiated
   * by the edge drivers.  Because the 'module' field of sht must be the
   * edge driver's module reference, otherwise the driver can be unloaded
   * even if the scsi_device is being accessed.
   */
  #define ATA_BASE_SHT(drv_name)					\
  	.module			= THIS_MODULE,			\
  	.name			= drv_name,			\
  	.ioctl			= ata_scsi_ioctl,		\
  	.queuecommand		= ata_scsi_queuecmd,		\
  	.can_queue		= ATA_DEF_QUEUE,		\
  	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,		\
  	.this_id		= ATA_SHT_THIS_ID,		\
  	.emulated		= ATA_SHT_EMULATED,		\
  	.use_clustering		= ATA_SHT_USE_CLUSTERING,	\
  	.proc_name		= drv_name,			\
  	.slave_configure	= ata_scsi_slave_config,	\
  	.slave_destroy		= ata_scsi_slave_destroy,	\
  	.bios_param		= ata_std_bios_param,		\
  	.unlock_native_capacity	= ata_scsi_unlock_native_capacity, \
  	.sdev_attrs		= ata_common_sdev_attrs
  
  #define ATA_NCQ_SHT(drv_name)					\
  	ATA_BASE_SHT(drv_name),					\
  	.change_queue_depth	= ata_scsi_change_queue_depth
  
  /*
   * PMP helpers
   */
  #ifdef CONFIG_SATA_PMP
  static inline bool sata_pmp_supported(struct ata_port *ap)
  {
  	return ap->flags & ATA_FLAG_PMP;
  }
  
  static inline bool sata_pmp_attached(struct ata_port *ap)
  {
  	return ap->nr_pmp_links != 0;
  }
  
  static inline bool ata_is_host_link(const struct ata_link *link)
  {
  	return link == &link->ap->link || link == link->ap->slave_link;
  }
  #else /* CONFIG_SATA_PMP */
  static inline bool sata_pmp_supported(struct ata_port *ap)
  {
  	return false;
  }
  
  static inline bool sata_pmp_attached(struct ata_port *ap)
  {
  	return false;
  }
  
  static inline bool ata_is_host_link(const struct ata_link *link)
  {
  	return 1;
  }
  #endif /* CONFIG_SATA_PMP */
  
  static inline int sata_srst_pmp(struct ata_link *link)
  {
  	if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
  		return SATA_PMP_CTRL_PORT;
  	return link->pmp;
  }
  
  /*
   * printk helpers
   */
  __printf(3, 4)
  void ata_port_printk(const struct ata_port *ap, const char *level,
  		     const char *fmt, ...);
  __printf(3, 4)
  void ata_link_printk(const struct ata_link *link, const char *level,
  		     const char *fmt, ...);
  __printf(3, 4)
  void ata_dev_printk(const struct ata_device *dev, const char *level,
  		    const char *fmt, ...);
  
  #define ata_port_err(ap, fmt, ...)				\
  	ata_port_printk(ap, KERN_ERR, fmt, ##__VA_ARGS__)
  #define ata_port_warn(ap, fmt, ...)				\
  	ata_port_printk(ap, KERN_WARNING, fmt, ##__VA_ARGS__)
  #define ata_port_notice(ap, fmt, ...)				\
  	ata_port_printk(ap, KERN_NOTICE, fmt, ##__VA_ARGS__)
  #define ata_port_info(ap, fmt, ...)				\
  	ata_port_printk(ap, KERN_INFO, fmt, ##__VA_ARGS__)
  #define ata_port_dbg(ap, fmt, ...)				\
  	ata_port_printk(ap, KERN_DEBUG, fmt, ##__VA_ARGS__)
  
  #define ata_link_err(link, fmt, ...)				\
  	ata_link_printk(link, KERN_ERR, fmt, ##__VA_ARGS__)
  #define ata_link_warn(link, fmt, ...)				\
  	ata_link_printk(link, KERN_WARNING, fmt, ##__VA_ARGS__)
  #define ata_link_notice(link, fmt, ...)				\
  	ata_link_printk(link, KERN_NOTICE, fmt, ##__VA_ARGS__)
  #define ata_link_info(link, fmt, ...)				\
  	ata_link_printk(link, KERN_INFO, fmt, ##__VA_ARGS__)
  #define ata_link_dbg(link, fmt, ...)				\
  	ata_link_printk(link, KERN_DEBUG, fmt, ##__VA_ARGS__)
  
  #define ata_dev_err(dev, fmt, ...)				\
  	ata_dev_printk(dev, KERN_ERR, fmt, ##__VA_ARGS__)
  #define ata_dev_warn(dev, fmt, ...)				\
  	ata_dev_printk(dev, KERN_WARNING, fmt, ##__VA_ARGS__)
  #define ata_dev_notice(dev, fmt, ...)				\
  	ata_dev_printk(dev, KERN_NOTICE, fmt, ##__VA_ARGS__)
  #define ata_dev_info(dev, fmt, ...)				\
  	ata_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
  #define ata_dev_dbg(dev, fmt, ...)				\
  	ata_dev_printk(dev, KERN_DEBUG, fmt, ##__VA_ARGS__)
  
  void ata_print_version(const struct device *dev, const char *version);
  
  /*
   * ata_eh_info helpers
   */
  extern __printf(2, 3)
  void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...);
  extern __printf(2, 3)
  void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...);
  extern void ata_ehi_clear_desc(struct ata_eh_info *ehi);
  
  static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
  {
  	ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
  	ehi->flags |= ATA_EHI_HOTPLUGGED;
  	ehi->action |= ATA_EH_RESET | ATA_EH_ENABLE_LINK;
  	ehi->err_mask |= AC_ERR_ATA_BUS;
  }
  
  /*
   * port description helpers
   */
  extern __printf(2, 3)
  void ata_port_desc(struct ata_port *ap, const char *fmt, ...);
  #ifdef CONFIG_PCI
  extern void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
  			       const char *name);
  #endif
  
  static inline unsigned int ata_tag_valid(unsigned int tag)
  {
  	return (tag < ATA_MAX_QUEUE) ? 1 : 0;
  }
  
  static inline unsigned int ata_tag_internal(unsigned int tag)
  {
  	return tag == ATA_TAG_INTERNAL;
  }
  
  /*
   * device helpers
   */
  static inline unsigned int ata_class_enabled(unsigned int class)
  {
  	return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI ||
  		class == ATA_DEV_PMP || class == ATA_DEV_SEMB ||
  		class == ATA_DEV_ZAC;
  }
  
  static inline unsigned int ata_class_disabled(unsigned int class)
  {
  	return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP ||
  		class == ATA_DEV_PMP_UNSUP || class == ATA_DEV_SEMB_UNSUP ||
  		class == ATA_DEV_ZAC_UNSUP;
  }
  
  static inline unsigned int ata_class_absent(unsigned int class)
  {
  	return !ata_class_enabled(class) && !ata_class_disabled(class);
  }
  
  static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
  {
  	return ata_class_enabled(dev->class);
  }
  
  static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
  {
  	return ata_class_disabled(dev->class);
  }
  
  static inline unsigned int ata_dev_absent(const struct ata_device *dev)
  {
  	return ata_class_absent(dev->class);
  }
  
  /*
   * link helpers
   */
  static inline int ata_link_max_devices(const struct ata_link *link)
  {
  	if (ata_is_host_link(link) && link->ap->flags & ATA_FLAG_SLAVE_POSS)
  		return 2;
  	return 1;
  }
  
  static inline int ata_link_active(struct ata_link *link)
  {
  	return ata_tag_valid(link->active_tag) || link->sactive;
  }
  
  /*
   * Iterators
   *
   * ATA_LITER_* constants are used to select link iteration mode and
   * ATA_DITER_* device iteration mode.
   *
   * For a custom iteration directly using ata_{link|dev}_next(), if
   * @link or @dev, respectively, is NULL, the first element is
   * returned.  @dev and @link can be any valid device or link and the
   * next element according to the iteration mode will be returned.
   * After the last element, NULL is returned.
   */
  enum ata_link_iter_mode {
  	ATA_LITER_EDGE,		/* if present, PMP links only; otherwise,
  				 * host link.  no slave link */
  	ATA_LITER_HOST_FIRST,	/* host link followed by PMP or slave links */
  	ATA_LITER_PMP_FIRST,	/* PMP links followed by host link,
  				 * slave link still comes after host link */
  };
  
  enum ata_dev_iter_mode {
  	ATA_DITER_ENABLED,
  	ATA_DITER_ENABLED_REVERSE,
  	ATA_DITER_ALL,
  	ATA_DITER_ALL_REVERSE,
  };
  
  extern struct ata_link *ata_link_next(struct ata_link *link,
  				      struct ata_port *ap,
  				      enum ata_link_iter_mode mode);
  
  extern struct ata_device *ata_dev_next(struct ata_device *dev,
  				       struct ata_link *link,
  				       enum ata_dev_iter_mode mode);
  
  /*
   * Shortcut notation for iterations
   *
   * ata_for_each_link() iterates over each link of @ap according to
   * @mode.  @link points to the current link in the loop.  @link is
   * NULL after loop termination.  ata_for_each_dev() works the same way
   * except that it iterates over each device of @link.
   *
   * Note that the mode prefixes ATA_{L|D}ITER_ shouldn't need to be
   * specified when using the following shorthand notations.  Only the
   * mode itself (EDGE, HOST_FIRST, ENABLED, etc...) should be
   * specified.  This not only increases brevity but also makes it
   * impossible to use ATA_LITER_* for device iteration or vice-versa.
   */
  #define ata_for_each_link(link, ap, mode) \
  	for ((link) = ata_link_next(NULL, (ap), ATA_LITER_##mode); (link); \
  	     (link) = ata_link_next((link), (ap), ATA_LITER_##mode))
  
  #define ata_for_each_dev(dev, link, mode) \
  	for ((dev) = ata_dev_next(NULL, (link), ATA_DITER_##mode); (dev); \
  	     (dev) = ata_dev_next((dev), (link), ATA_DITER_##mode))
  
  /**
   *	ata_ncq_enabled - Test whether NCQ is enabled
   *	@dev: ATA device to test for
   *
   *	LOCKING:
   *	spin_lock_irqsave(host lock)
   *
   *	RETURNS:
   *	1 if NCQ is enabled for @dev, 0 otherwise.
   */
  static inline int ata_ncq_enabled(struct ata_device *dev)
  {
  	return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
  			      ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
  }
  
  static inline bool ata_fpdma_dsm_supported(struct ata_device *dev)
  {
  	return (dev->flags & ATA_DFLAG_NCQ_SEND_RECV) &&
  		(dev->ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &
  		 ATA_LOG_NCQ_SEND_RECV_DSM_TRIM);
  }
  
  static inline bool ata_fpdma_read_log_supported(struct ata_device *dev)
  {
  	return (dev->flags & ATA_DFLAG_NCQ_SEND_RECV) &&
  		(dev->ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_RD_LOG_OFFSET] &
  		 ATA_LOG_NCQ_SEND_RECV_RD_LOG_SUPPORTED);
  }
  
  static inline bool ata_fpdma_zac_mgmt_in_supported(struct ata_device *dev)
  {
  	return (dev->flags & ATA_DFLAG_NCQ_SEND_RECV) &&
  		(dev->ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_ZAC_MGMT_OFFSET] &
  		ATA_LOG_NCQ_SEND_RECV_ZAC_MGMT_IN_SUPPORTED);
  }
  
  static inline bool ata_fpdma_zac_mgmt_out_supported(struct ata_device *dev)
  {
  	return (dev->ncq_non_data_cmds[ATA_LOG_NCQ_NON_DATA_ZAC_MGMT_OFFSET] &
  		ATA_LOG_NCQ_NON_DATA_ZAC_MGMT_OUT);
  }
  
  static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
  {
  	qc->tf.ctl |= ATA_NIEN;
  }
  
  static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
  						       unsigned int tag)
  {
  	if (likely(ata_tag_valid(tag)))
  		return &ap->qcmd[tag];
  	return NULL;
  }
  
  static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
  						     unsigned int tag)
  {
  	struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
  
  	if (unlikely(!qc) || !ap->ops->error_handler)
  		return qc;
  
  	if ((qc->flags & (ATA_QCFLAG_ACTIVE |
  			  ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
  		return qc;
  
  	return NULL;
  }
  
  static inline unsigned int ata_qc_raw_nbytes(struct ata_queued_cmd *qc)
  {
  	return qc->nbytes - min(qc->extrabytes, qc->nbytes);
  }
  
  static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
  {
  	memset(tf, 0, sizeof(*tf));
  
  #ifdef CONFIG_ATA_SFF
  	tf->ctl = dev->link->ap->ctl;
  #else
  	tf->ctl = ATA_DEVCTL_OBS;
  #endif
  	if (dev->devno == 0)
  		tf->device = ATA_DEVICE_OBS;
  	else
  		tf->device = ATA_DEVICE_OBS | ATA_DEV1;
  }
  
  static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
  {
  	qc->dma_dir = DMA_NONE;
  	qc->sg = NULL;
  	qc->flags = 0;
  	qc->cursg = NULL;
  	qc->cursg_ofs = 0;
  	qc->nbytes = qc->extrabytes = qc->curbytes = 0;
  	qc->n_elem = 0;
  	qc->err_mask = 0;
  	qc->sect_size = ATA_SECT_SIZE;
  
  	ata_tf_init(qc->dev, &qc->tf);
  
  	/* init result_tf such that it indicates normal completion */
  	qc->result_tf.command = ATA_DRDY;
  	qc->result_tf.feature = 0;
  }
  
  static inline int ata_try_flush_cache(const struct ata_device *dev)
  {
  	return ata_id_wcache_enabled(dev->id) ||
  	       ata_id_has_flush(dev->id) ||
  	       ata_id_has_flush_ext(dev->id);
  }
  
  static inline unsigned int ac_err_mask(u8 status)
  {
  	if (status & (ATA_BUSY | ATA_DRQ))
  		return AC_ERR_HSM;
  	if (status & (ATA_ERR | ATA_DF))
  		return AC_ERR_DEV;
  	return 0;
  }
  
  static inline unsigned int __ac_err_mask(u8 status)
  {
  	unsigned int mask = ac_err_mask(status);
  	if (mask == 0)
  		return AC_ERR_OTHER;
  	return mask;
  }
  
  static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
  {
  	return *(struct ata_port **)&host->hostdata[0];
  }
  
  static inline int ata_check_ready(u8 status)
  {
  	if (!(status & ATA_BUSY))
  		return 1;
  
  	/* 0xff indicates either no device or device not ready */
  	if (status == 0xff)
  		return -ENODEV;
  
  	return 0;
  }
  
  static inline unsigned long ata_deadline(unsigned long from_jiffies,
  					 unsigned long timeout_msecs)
  {
  	return from_jiffies + msecs_to_jiffies(timeout_msecs);
  }
  
  /* Don't open code these in drivers as there are traps. Firstly the range may
     change in future hardware and specs, secondly 0xFF means 'no DMA' but is
     > UDMA_0. Dyma ddreigiau */
  
  static inline int ata_using_mwdma(struct ata_device *adev)
  {
  	if (adev->dma_mode >= XFER_MW_DMA_0 && adev->dma_mode <= XFER_MW_DMA_4)
  		return 1;
  	return 0;
  }
  
  static inline int ata_using_udma(struct ata_device *adev)
  {
  	if (adev->dma_mode >= XFER_UDMA_0 && adev->dma_mode <= XFER_UDMA_7)
  		return 1;
  	return 0;
  }
  
  static inline int ata_dma_enabled(struct ata_device *adev)
  {
  	return (adev->dma_mode == 0xFF ? 0 : 1);
  }
  
  /**************************************************************************
   * PMP - drivers/ata/libata-pmp.c
   */
  #ifdef CONFIG_SATA_PMP
  
  extern const struct ata_port_operations sata_pmp_port_ops;
  
  extern int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc);
  extern void sata_pmp_error_handler(struct ata_port *ap);
  
  #else /* CONFIG_SATA_PMP */
  
  #define sata_pmp_port_ops		sata_port_ops
  #define sata_pmp_qc_defer_cmd_switch	ata_std_qc_defer
  #define sata_pmp_error_handler		ata_std_error_handler
  
  #endif /* CONFIG_SATA_PMP */
  
  
  /**************************************************************************
   * SFF - drivers/ata/libata-sff.c
   */
  #ifdef CONFIG_ATA_SFF
  
  extern const struct ata_port_operations ata_sff_port_ops;
  extern const struct ata_port_operations ata_bmdma32_port_ops;
  
  /* PIO only, sg_tablesize and dma_boundary limits can be removed */
  #define ATA_PIO_SHT(drv_name)					\
  	ATA_BASE_SHT(drv_name),					\
  	.sg_tablesize		= LIBATA_MAX_PRD,		\
  	.dma_boundary		= ATA_DMA_BOUNDARY
  
  extern void ata_sff_dev_select(struct ata_port *ap, unsigned int device);
  extern u8 ata_sff_check_status(struct ata_port *ap);
  extern void ata_sff_pause(struct ata_port *ap);
  extern void ata_sff_dma_pause(struct ata_port *ap);
  extern int ata_sff_busy_sleep(struct ata_port *ap,
  			      unsigned long timeout_pat, unsigned long timeout);
  extern int ata_sff_wait_ready(struct ata_link *link, unsigned long deadline);
  extern void ata_sff_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
  extern void ata_sff_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
  extern void ata_sff_exec_command(struct ata_port *ap,
  				 const struct ata_taskfile *tf);
  extern unsigned int ata_sff_data_xfer(struct ata_device *dev,
  			unsigned char *buf, unsigned int buflen, int rw);
  extern unsigned int ata_sff_data_xfer32(struct ata_device *dev,
  			unsigned char *buf, unsigned int buflen, int rw);
  extern unsigned int ata_sff_data_xfer_noirq(struct ata_device *dev,
  			unsigned char *buf, unsigned int buflen, int rw);
  extern void ata_sff_irq_on(struct ata_port *ap);
  extern void ata_sff_irq_clear(struct ata_port *ap);
  extern int ata_sff_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
  			    u8 status, int in_wq);
  extern void ata_sff_queue_work(struct work_struct *work);
  extern void ata_sff_queue_delayed_work(struct delayed_work *dwork,
  		unsigned long delay);
  extern void ata_sff_queue_pio_task(struct ata_link *link, unsigned long delay);
  extern unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc);
  extern bool ata_sff_qc_fill_rtf(struct ata_queued_cmd *qc);
  extern unsigned int ata_sff_port_intr(struct ata_port *ap,
  				      struct ata_queued_cmd *qc);
  extern irqreturn_t ata_sff_interrupt(int irq, void *dev_instance);
  extern void ata_sff_lost_interrupt(struct ata_port *ap);
  extern void ata_sff_freeze(struct ata_port *ap);
  extern void ata_sff_thaw(struct ata_port *ap);
  extern int ata_sff_prereset(struct ata_link *link, unsigned long deadline);
  extern unsigned int ata_sff_dev_classify(struct ata_device *dev, int present,
  					  u8 *r_err);
  extern int ata_sff_wait_after_reset(struct ata_link *link, unsigned int devmask,
  				    unsigned long deadline);
  extern int ata_sff_softreset(struct ata_link *link, unsigned int *classes,
  			     unsigned long deadline);
  extern int sata_sff_hardreset(struct ata_link *link, unsigned int *class,
  			       unsigned long deadline);
  extern void ata_sff_postreset(struct ata_link *link, unsigned int *classes);
  extern void ata_sff_drain_fifo(struct ata_queued_cmd *qc);
  extern void ata_sff_error_handler(struct ata_port *ap);
  extern void ata_sff_std_ports(struct ata_ioports *ioaddr);
  #ifdef CONFIG_PCI
  extern int ata_pci_sff_init_host(struct ata_host *host);
  extern int ata_pci_sff_prepare_host(struct pci_dev *pdev,
  				    const struct ata_port_info * const * ppi,
  				    struct ata_host **r_host);
  extern int ata_pci_sff_activate_host(struct ata_host *host,
  				     irq_handler_t irq_handler,
  				     struct scsi_host_template *sht);
  extern int ata_pci_sff_init_one(struct pci_dev *pdev,
  		const struct ata_port_info * const * ppi,
  		struct scsi_host_template *sht, void *host_priv, int hflags);
  #endif /* CONFIG_PCI */
  
  #ifdef CONFIG_ATA_BMDMA
  
  extern const struct ata_port_operations ata_bmdma_port_ops;
  
  #define ATA_BMDMA_SHT(drv_name)					\
  	ATA_BASE_SHT(drv_name),					\
  	.sg_tablesize		= LIBATA_MAX_PRD,		\
  	.dma_boundary		= ATA_DMA_BOUNDARY
  
  extern void ata_bmdma_qc_prep(struct ata_queued_cmd *qc);
  extern unsigned int ata_bmdma_qc_issue(struct ata_queued_cmd *qc);
  extern void ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc);
  extern unsigned int ata_bmdma_port_intr(struct ata_port *ap,
  				      struct ata_queued_cmd *qc);
  extern irqreturn_t ata_bmdma_interrupt(int irq, void *dev_instance);
  extern void ata_bmdma_error_handler(struct ata_port *ap);
  extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
  extern void ata_bmdma_irq_clear(struct ata_port *ap);
  extern void ata_bmdma_setup(struct ata_queued_cmd *qc);
  extern void ata_bmdma_start(struct ata_queued_cmd *qc);
  extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
  extern u8 ata_bmdma_status(struct ata_port *ap);
  extern int ata_bmdma_port_start(struct ata_port *ap);
  extern int ata_bmdma_port_start32(struct ata_port *ap);
  
  #ifdef CONFIG_PCI
  extern int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev);
  extern void ata_pci_bmdma_init(struct ata_host *host);
  extern int ata_pci_bmdma_prepare_host(struct pci_dev *pdev,
  				      const struct ata_port_info * const * ppi,
  				      struct ata_host **r_host);
  extern int ata_pci_bmdma_init_one(struct pci_dev *pdev,
  				  const struct ata_port_info * const * ppi,
  				  struct scsi_host_template *sht,
  				  void *host_priv, int hflags);
  #endif /* CONFIG_PCI */
  #endif /* CONFIG_ATA_BMDMA */
  
  /**
   *	ata_sff_busy_wait - Wait for a port status register
   *	@ap: Port to wait for.
   *	@bits: bits that must be clear
   *	@max: number of 10uS waits to perform
   *
   *	Waits up to max*10 microseconds for the selected bits in the port's
   *	status register to be cleared.
   *	Returns final value of status register.
   *
   *	LOCKING:
   *	Inherited from caller.
   */
  static inline u8 ata_sff_busy_wait(struct ata_port *ap, unsigned int bits,
  				   unsigned int max)
  {
  	u8 status;
  
  	do {
  		udelay(10);
  		status = ap->ops->sff_check_status(ap);
  		max--;
  	} while (status != 0xff && (status & bits) && (max > 0));
  
  	return status;
  }
  
  /**
   *	ata_wait_idle - Wait for a port to be idle.
   *	@ap: Port to wait for.
   *
   *	Waits up to 10ms for port's BUSY and DRQ signals to clear.
   *	Returns final value of status register.
   *
   *	LOCKING:
   *	Inherited from caller.
   */
  static inline u8 ata_wait_idle(struct ata_port *ap)
  {
  	u8 status = ata_sff_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
  
  #ifdef ATA_DEBUG
  	if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ)))
  		ata_port_printk(ap, KERN_DEBUG, "abnormal Status 0x%X\n",
  				status);
  #endif
  
  	return status;
  }
  #endif /* CONFIG_ATA_SFF */
  
  #endif /* __LINUX_LIBATA_H__ */
  