/*
 *  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/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>

/*
 * 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
#include <asm-generic/libata-portmap.h>
#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, __FUNCTION__, ## args)
#ifdef ATA_VERBOSE_DEBUG
#define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## 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, __FUNCTION__, ## args)

/* 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         = (HZ >> 6) + 1,

        ATAPI_MAX_DRAIN         = 16 << 10,

        ATA_ALL_DEVICES         = (1 << ATA_MAX_DEVICES) - 1,

        ATA_SHT_EMULATED        = 1,
        ATA_SHT_CMD_PER_LUN     = 1,
        ATA_SHT_THIS_ID         = -1,
        ATA_SHT_USE_CLUSTERING  = 1,

        /* 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_HIPM          = (1 << 8), /* device supports HIPM */
        ATA_DFLAG_DIPM          = (1 << 9), /* device supports DIPM */
        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_SPUNDOWN      = (1 << 14), /* XXX: for spindown_compat */
        ATA_DFLAG_SLEEPING      = (1 << 15), /* device is sleeping */
        ATA_DFLAG_DUBIOUS_XFER  = (1 << 16), /* data transfer not verified */
        ATA_DFLAG_INIT_MASK     = (1 << 24) - 1,

        ATA_DFLAG_DETACH        = (1 << 24),
        ATA_DFLAG_DETACHED      = (1 << 25),

        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_NONE            = 9,    /* no device */

        /* struct ata_link flags */
        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 */

        /* 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_LEGACY      = (1 << 2), /* no legacy mode check */
        ATA_FLAG_MMIO           = (1 << 3), /* use MMIO, not PIO */
        ATA_FLAG_SRST           = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
        ATA_FLAG_SATA_RESET     = (1 << 5), /* (obsolete) use COMRESET */
        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_DEBUGMSG       = (1 << 13),
        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_IPM            = (1 << 20), /* driver can handle IPM */

        /* The following flag belongs to ap->pflags but is kept in
         * ap->flags because it's referenced in many LLDs and will be
         * removed in not-too-distant future.
         */
        ATA_FLAG_DISABLED       = (1 << 23), /* port is disabled, ignore it */

        /* 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_UNLOADING     = (1 << 5), /* module is unloading */
        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_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 */

        /* 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 */

        /* bits 24:31 of host->flags are reserved for LLD specific flags */

        /* various lengths of time */
        ATA_TMOUT_BOOT          = 30 * HZ,      /* heuristic */
        ATA_TMOUT_BOOT_QUICK    = 7 * HZ,       /* heuristic */
        ATA_TMOUT_INTERNAL      = 30 * HZ,
        ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,

        /* FIXME: GoVault needs 2s but we can't afford that without
         * parallel probing.  800ms is enough for iVDR disk
         * HHD424020F7SV00.  Increase to 2secs when parallel probing
         * is in place.
         */
        ATA_TMOUT_FF_WAIT       = 4 * HZ / 5,

        /* 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_MSECS = 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 = 1 * HZ,

        /* 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_LPM              = (1 << 4),  /* link power management action */

        ATA_EH_PERDEV_MASK      = ATA_EH_REVALIDATE,

        /* 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_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), /* revaildating after setmode */

        ATA_EHI_DID_RESET       = ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,

        /* max tries if error condition is still set after ->error_handler */
        ATA_EH_MAX_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 */

        /* Horkage types. May be set by libata or controller on drives
           (some horkage may be drive/controller pair dependant */

        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_IPM         = (1 << 7),     /* Link PM problems */
        ATA_HORKAGE_IVB         = (1 << 8),     /* cbl det validity bit bugs */
        ATA_HORKAGE_STUCK_ERR   = (1 << 9),     /* stuck ERR on next PACKET */

         /* 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_CYCLE        = (1 << 6),
        ATA_TIMING_UDMA         = (1 << 7),
        ATA_TIMING_ALL          = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
                                  ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
                                  ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
                                  ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
};

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 */
};

/* 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);

/*
 * host pm policy: If you alter this, you also need to alter libata-scsi.c
 * (for the ascii descriptions)
 */
enum link_pm {
        NOT_AVAILABLE,
        MIN_POWER,
        MAX_PERFORMANCE,
        MEDIUM_POWER,
};
extern struct device_attribute dev_attr_link_power_management_policy;

#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;
        void __iomem            *bmdma_addr;
        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;
        void                    *private_data;
        struct ata_port_operations *ops;
        unsigned long           flags;
#ifdef CONFIG_ATA_ACPI
        acpi_handle             acpi_handle;
#endif
        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;

        int                     dma_dir;

        unsigned int            sect_size;

        unsigned int            nbytes;
        unsigned int            extrabytes;
        unsigned int            curbytes;

        struct scatterlist      *cursg;
        unsigned int            cursg_ofs;

        struct scatterlist      sgent;

        struct scatterlist      *sg;

        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 long           flags;          /* ATA_DFLAG_xxx */
        unsigned int            horkage;        /* List of broken features */
        struct scsi_device      *sdev;          /* attached SCSI device */
#ifdef CONFIG_ATA_ACPI
        acpi_handle             acpi_handle;
        union acpi_object       *gtf_cache;
#endif
        /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
        u64                     n_sectors;      /* size of device, if ATA */
        unsigned int            class;          /* ATA_DEV_xxx */

        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 */

        /* error history */
        int                     spdn_cnt;
        struct ata_ering        ering;

        union {
                u16             id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
                u32             gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
        };
};

/* Offset into struct ata_device.  Fields above it are maintained
 * acress device init.  Fields below are zeroed.
 */
#define ATA_DEVICE_CLEAR_OFFSET         offsetof(struct ata_device, n_sectors)

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];
        unsigned int            classes[ATA_MAX_DEVICES];
        unsigned int            did_probe_mask;
        unsigned int            saved_ncq_enabled;
        u8                      saved_xfer_mode[ATA_MAX_DEVICES];
};

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 # */

        unsigned int            active_tag;     /* active tag on this link */
        u32                     sactive;        /* active NCQ commands */

        unsigned int            flags;          /* ATA_LFLAG_xxx */

        unsigned int            hw_sata_spd_limit;
        unsigned int            sata_spd_limit;
        unsigned int            sata_spd;       /* current SATA PHY speed */

        /* 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];
};

struct ata_port {
        struct Scsi_Host        *scsi_host; /* our co-allocated scsi host */
        struct ata_port_operations *ops;
        spinlock_t              *lock;
        unsigned long           flags;  /* ATA_FLAG_xxx */
        unsigned int            pflags; /* ATA_PFLAG_xxx */
        unsigned int            print_id; /* user visible unique port ID */
        unsigned int            port_no; /* 0 based port no. inside the host */

        struct ata_prd          *prd;    /* our SG list */
        dma_addr_t              prd_dma; /* and its DMA mapping */

#ifdef CONFIG_ATA_SFF
        struct ata_ioports      ioaddr; /* ATA cmd/ctl/dma register blocks */
#endif /* CONFIG_ATA_SFF */

        u8                      ctl;    /* cache of ATA control register */
        u8                      last_ctl;       /* Cache last written value */
        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           qc_allocated;
        unsigned int            qc_active;
        int                     nr_active_links; /* #links with active qcs */

        struct ata_link         link;   /* host default link */

        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;

        void                    *port_task_data;
        struct delayed_work     port_task;
        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;

        pm_message_t            pm_mesg;
        int                     *pm_result;
        enum link_pm            pm_policy;

        struct timer_list       fastdrain_timer;
        unsigned long           fastdrain_cnt;

        void                    *private_data;

#ifdef CONFIG_ATA_ACPI
        acpi_handle             acpi_handle;
        struct ata_acpi_gtm     __acpi_init_gtm; /* use ata_acpi_init_gtm() */
#endif
        u8                      sector_buf[ATA_SECT_SIZE]; /* owned by EH */
};

/* 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);

        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 (*post_internal_cmd)(struct ata_queued_cmd *qc);

        /*
         * Optional features
         */
        int  (*scr_read)(struct ata_port *ap, unsigned int sc_reg, u32 *val);
        int  (*scr_write)(struct ata_port *ap, unsigned int sc_reg, u32 val);
        void (*pmp_attach)(struct ata_port *ap);
        void (*pmp_detach)(struct ata_port *ap);
        int  (*enable_pm)(struct ata_port *ap, enum link_pm policy);
        void (*disable_pm)(struct ata_port *ap);

        /*
         * 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);
        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);
        u8   (*sff_irq_on)(struct ata_port *);
        void (*sff_irq_clear)(struct ata_port *);

        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_SFF */

        /*
         * 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 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 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 void ata_port_probe(struct ata_port *);
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_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 void ata_port_disable(struct ata_port *);

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_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 *,
                          unsigned long, 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_cmnd *cmd, void (*done)(struct scsi_cmnd *));
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 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, void (*done)(struct scsi_cmnd *),
                            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 int ata_link_online(struct ata_link *link);
extern int 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);
#endif
extern int ata_ratelimit(void);
extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
                             unsigned long interval_msec,
                             unsigned long timeout_msec);
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_port_start(struct ata_port *ap);
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 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,
                              void (*done)(struct scsi_cmnd *));
extern int ata_std_bios_param(struct scsi_device *sdev,
                              struct block_device *bdev,
                              sector_t capacity, int geom[]);
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 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 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_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 */

/*
 * 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 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);

/*
 * 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;

#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,                \
        .this_id                = ATA_SHT_THIS_ID,              \
        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,          \
        .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

#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 int ata_is_host_link(const struct ata_link *link)
{
        return link == &link->ap->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 int 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
 */
#define ata_port_printk(ap, lv, fmt, args...) \
        printk("%sata%u: "fmt, lv, (ap)->print_id , ##args)

#define ata_link_printk(link, lv, fmt, args...) do { \
        if (sata_pmp_attached((link)->ap)) \
                printk("%sata%u.%02u: "fmt, lv, (link)->ap->print_id,   \
                       (link)->pmp , ##args); \
        else \
                printk("%sata%u: "fmt, lv, (link)->ap->print_id , ##args); \
        } while(0)

#define ata_dev_printk(dev, lv, fmt, args...) \
        printk("%sata%u.%02u: "fmt, lv, (dev)->link->ap->print_id,      \
               (dev)->link->pmp + (dev)->devno , ##args)

/*
 * ata_eh_info helpers
 */
extern void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
        __attribute__ ((format (printf, 2, 3)));
extern void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
        __attribute__ ((format (printf, 2, 3)));
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 void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
        __attribute__ ((format (printf, 2, 3)));
#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;
}

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;
}

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;
}

static inline struct ata_link *ata_port_first_link(struct ata_port *ap)
{
        if (sata_pmp_attached(ap))
                return ap->pmp_link;
        return &ap->link;
}

static inline struct ata_link *ata_port_next_link(struct ata_link *link)
{
        struct ata_port *ap = link->ap;

        if (ata_is_host_link(link)) {
                if (!sata_pmp_attached(ap))
                        return NULL;
                return ap->pmp_link;
        }

        if (++link < ap->nr_pmp_links + ap->pmp_link)
                return link;
        return NULL;
}

#define __ata_port_for_each_link(lk, ap) \
        for ((lk) = &(ap)->link; (lk); (lk) = ata_port_next_link(lk))

#define ata_port_for_each_link(link, ap) \
        for ((link) = ata_port_first_link(ap); (link); \
             (link) = ata_port_next_link(link))

#define ata_link_for_each_dev(dev, link) \
        for ((dev) = (link)->device; \
             (dev) < (link)->device + ata_link_max_devices(link) || ((dev) = NULL); \
             (dev)++)

#define ata_link_for_each_dev_reverse(dev, link) \
        for ((dev) = (link)->device + ata_link_max_devices(link) - 1; \
             (dev) >= (link)->device || ((dev) = NULL); (dev)--)

/**
 *      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 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));

        tf->ctl = dev->link->ap->ctl;
        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;
}


/**************************************************************************
 * 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_bmdma_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

#define ATA_BMDMA_SHT(drv_name)                                 \
        ATA_BASE_SHT(drv_name),                                 \
        .sg_tablesize           = LIBATA_MAX_PRD,               \
        .dma_boundary           = ATA_DMA_BOUNDARY

extern void ata_sff_qc_prep(struct ata_queued_cmd *qc);
extern void ata_sff_dumb_qc_prep(struct ata_queued_cmd *qc);
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_xfer_noirq(struct ata_device *dev,
                        unsigned char *buf, unsigned int buflen, int rw);
extern u8 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 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_host_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_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_error_handler(struct ata_port *ap);
extern void ata_sff_post_internal_cmd(struct ata_queued_cmd *qc);
extern int ata_sff_port_start(struct ata_port *ap);
extern void ata_sff_std_ports(struct ata_ioports *ioaddr);
extern unsigned long ata_bmdma_mode_filter(struct ata_device *dev,
                                           unsigned long xfer_mask);
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 void ata_bus_reset(struct ata_port *ap);

#ifdef CONFIG_PCI
extern int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev);
extern int ata_pci_bmdma_init(struct ata_host *host);
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);
#endif /* CONFIG_PCI */

/**
 *      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__ */