Merge /spare/repo/linux-2.6/

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / include / linux / libata.h

/*
 *  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/pci.h>
#include <asm/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>

/*
 * compile-time options
 */
#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 */
#undef ATA_ENABLE_PATA          /* define to enable PATA support in some
                                 * low-level drivers */
#undef ATAPI_ENABLE_DMADIR      /* enables ATAPI DMADIR bridge support */


/* 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 */

#ifdef ATA_NDEBUG
#define assert(expr)
#else
#define assert(expr) \
        if(unlikely(!(expr))) {                                   \
        printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
        #expr,__FILE__,__FUNCTION__,__LINE__);          \
        }
#endif

/* defines only for the constants which don't work well as enums */
#define ATA_TAG_POISON          0xfafbfcfdU

/* move to PCI layer? */
static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
{
        return &pdev->dev;
}

enum {
        /* various global constants */
        LIBATA_MAX_PRD          = ATA_MAX_PRD / 2,
        ATA_MAX_PORTS           = 8,
        ATA_DEF_QUEUE           = 1,
        ATA_MAX_QUEUE           = 1,
        ATA_MAX_SECTORS         = 200,  /* FIXME */
        ATA_MAX_BUS             = 2,
        ATA_DEF_BUSY_WAIT       = 10000,
        ATA_SHORT_PAUSE         = (HZ >> 6) + 1,

        ATA_SHT_EMULATED        = 1,
        ATA_SHT_CMD_PER_LUN     = 1,
        ATA_SHT_THIS_ID         = -1,
        ATA_SHT_USE_CLUSTERING  = 0,

        /* struct ata_device stuff */
        ATA_DFLAG_LBA48         = (1 << 0), /* device supports LBA48 */
        ATA_DFLAG_PIO           = (1 << 1), /* device currently in PIO mode */
        ATA_DFLAG_LOCK_SECTORS  = (1 << 2), /* don't adjust max_sectors */
        ATA_DFLAG_LBA           = (1 << 3), /* device supports LBA */

        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_NONE            = 5,    /* no device */

        /* struct ata_port flags */
        ATA_FLAG_SLAVE_POSS     = (1 << 1), /* host supports slave dev */
                                            /* (doesn't imply presence) */
        ATA_FLAG_PORT_DISABLED  = (1 << 2), /* port is disabled, ignore it */
        ATA_FLAG_SATA           = (1 << 3),
        ATA_FLAG_NO_LEGACY      = (1 << 4), /* no legacy mode check */
        ATA_FLAG_SRST           = (1 << 5), /* use ATA SRST, not E.D.D. */
        ATA_FLAG_MMIO           = (1 << 6), /* use MMIO, not PIO */
        ATA_FLAG_SATA_RESET     = (1 << 7), /* use COMRESET */
        ATA_FLAG_PIO_DMA        = (1 << 8), /* PIO cmds via DMA */
        ATA_FLAG_NOINTR         = (1 << 9), /* FIXME: Remove this once
                                             * proper HSM is in place. */

        ATA_QCFLAG_ACTIVE       = (1 << 1), /* cmd not yet ack'd to scsi lyer */
        ATA_QCFLAG_SG           = (1 << 3), /* have s/g table? */
        ATA_QCFLAG_SINGLE       = (1 << 4), /* no s/g, just a single buffer */
        ATA_QCFLAG_DMAMAP       = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,

        /* various lengths of time */
        ATA_TMOUT_EDD           = 5 * HZ,       /* hueristic */
        ATA_TMOUT_PIO           = 30 * HZ,
        ATA_TMOUT_BOOT          = 30 * HZ,      /* hueristic */
        ATA_TMOUT_BOOT_QUICK    = 7 * HZ,       /* hueristic */
        ATA_TMOUT_CDB           = 30 * HZ,
        ATA_TMOUT_CDB_QUICK     = 5 * 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_SHIFT_UDMA          = 0,
        ATA_SHIFT_MWDMA         = 8,
        ATA_SHIFT_PIO           = 11,
};

enum pio_task_states {
        PIO_ST_UNKNOWN,
        PIO_ST_IDLE,
        PIO_ST_POLL,
        PIO_ST_TMOUT,
        PIO_ST,
        PIO_ST_LAST,
        PIO_ST_LAST_POLL,
        PIO_ST_ERR,
};

/* forward declarations */
struct scsi_device;
struct ata_port_operations;
struct ata_port;
struct ata_queued_cmd;

/* typedefs */
typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);

struct ata_ioports {
        unsigned long           cmd_addr;
        unsigned long           data_addr;
        unsigned long           error_addr;
        unsigned long           feature_addr;
        unsigned long           nsect_addr;
        unsigned long           lbal_addr;
        unsigned long           lbam_addr;
        unsigned long           lbah_addr;
        unsigned long           device_addr;
        unsigned long           status_addr;
        unsigned long           command_addr;
        unsigned long           altstatus_addr;
        unsigned long           ctl_addr;
        unsigned long           bmdma_addr;
        unsigned long           scr_addr;
};

struct ata_probe_ent {
        struct list_head        node;
        struct device           *dev;
        struct ata_port_operations      *port_ops;
        Scsi_Host_Template      *sht;
        struct ata_ioports      port[ATA_MAX_PORTS];
        unsigned int            n_ports;
        unsigned int            hard_port_no;
        unsigned int            pio_mask;
        unsigned int            mwdma_mask;
        unsigned int            udma_mask;
        unsigned int            legacy_mode;
        unsigned long           irq;
        unsigned int            irq_flags;
        unsigned long           host_flags;
        void __iomem            *mmio_base;
        void                    *private_data;
};

struct ata_host_set {
        spinlock_t              lock;
        struct device           *dev;
        unsigned long           irq;
        void __iomem            *mmio_base;
        unsigned int            n_ports;
        void                    *private_data;
        struct ata_port_operations *ops;
        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            nsect;
        unsigned int            cursect;

        unsigned int            nbytes;
        unsigned int            curbytes;

        unsigned int            cursg;
        unsigned int            cursg_ofs;

        struct scatterlist      sgent;
        void                    *buf_virt;

        struct scatterlist      *sg;

        ata_qc_cb_t             complete_fn;

        struct completion       *waiting;

        void                    *private_data;
};

struct ata_host_stats {
        unsigned long           unhandled_irq;
        unsigned long           idle_irq;
        unsigned long           rw_reqbuf;
};

struct ata_device {
        u64                     n_sectors;      /* size of device, if ATA */
        unsigned long           flags;          /* ATA_DFLAG_xxx */
        unsigned int            class;          /* ATA_DEV_xxx */
        unsigned int            devno;          /* 0 or 1 */
        u16                     id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
        u8                      pio_mode;
        u8                      dma_mode;
        u8                      xfer_mode;
        unsigned int            xfer_shift;     /* ATA_SHIFT_xxx */

        /* cache info about current transfer mode */
        u8                      xfer_protocol;  /* taskfile xfer protocol */
        u8                      read_cmd;       /* opcode to use on read */
        u8                      write_cmd;      /* opcode to use on write */

        /* for CHS addressing */
        u16                     cylinders;      /* Number of cylinders */
        u16                     heads;          /* Number of heads */
        u16                     sectors;        /* Number of sectors per track */
};

struct ata_port {
        struct Scsi_Host        *host;  /* our co-allocated scsi host */
        struct ata_port_operations      *ops;
        unsigned long           flags;  /* ATA_FLAG_xxx */
        unsigned int            id;     /* unique id req'd by scsi midlyr */
        unsigned int            port_no; /* unique port #; from zero */
        unsigned int            hard_port_no;   /* hardware port #; from zero */

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

        struct ata_ioports      ioaddr; /* ATA cmd/ctl/dma register blocks */

        u8                      ctl;    /* cache of ATA control register */
        u8                      last_ctl;       /* Cache last written value */
        unsigned int            bus_state;
        unsigned int            port_state;
        unsigned int            pio_mask;
        unsigned int            mwdma_mask;
        unsigned int            udma_mask;
        unsigned int            cbl;    /* cable type; ATA_CBL_xxx */
        unsigned int            cdb_len;

        struct ata_device       device[ATA_MAX_DEVICES];

        struct ata_queued_cmd   qcmd[ATA_MAX_QUEUE];
        unsigned long           qactive;
        unsigned int            active_tag;

        struct ata_host_stats   stats;
        struct ata_host_set     *host_set;

        struct work_struct      packet_task;

        struct work_struct      pio_task;
        unsigned int            pio_task_state;
        unsigned long           pio_task_timeout;

        void                    *private_data;
};

struct ata_port_operations {
        void (*port_disable) (struct ata_port *);

        void (*dev_config) (struct ata_port *, struct ata_device *);

        void (*set_piomode) (struct ata_port *, struct ata_device *);
        void (*set_dmamode) (struct ata_port *, struct ata_device *);

        void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
        void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);

        void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
        u8   (*check_status)(struct ata_port *ap);
        u8   (*check_altstatus)(struct ata_port *ap);
        u8   (*check_err)(struct ata_port *ap);
        void (*dev_select)(struct ata_port *ap, unsigned int device);

        void (*phy_reset) (struct ata_port *ap);
        void (*post_set_mode) (struct ata_port *ap);

        int (*check_atapi_dma) (struct ata_queued_cmd *qc);

        void (*bmdma_setup) (struct ata_queued_cmd *qc);
        void (*bmdma_start) (struct ata_queued_cmd *qc);

        void (*qc_prep) (struct ata_queued_cmd *qc);
        int (*qc_issue) (struct ata_queued_cmd *qc);

        void (*eng_timeout) (struct ata_port *ap);

        irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
        void (*irq_clear) (struct ata_port *);

        u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
        void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
                           u32 val);

        int (*port_start) (struct ata_port *ap);
        void (*port_stop) (struct ata_port *ap);

        void (*host_stop) (struct ata_host_set *host_set);

        void (*bmdma_stop) (struct ata_queued_cmd *qc);
        u8   (*bmdma_status) (struct ata_port *ap);
};

struct ata_port_info {
        Scsi_Host_Template      *sht;
        unsigned long           host_flags;
        unsigned long           pio_mask;
        unsigned long           mwdma_mask;
        unsigned long           udma_mask;
        struct ata_port_operations      *port_ops;
};


extern void ata_port_probe(struct ata_port *);
extern void __sata_phy_reset(struct ata_port *ap);
extern void sata_phy_reset(struct ata_port *ap);
extern void ata_bus_reset(struct ata_port *ap);
extern void ata_port_disable(struct ata_port *);
extern void ata_std_ports(struct ata_ioports *ioaddr);
#ifdef CONFIG_PCI
extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                             unsigned int n_ports);
extern void ata_pci_remove_one (struct pci_dev *pdev);
#endif /* CONFIG_PCI */
extern int ata_device_add(struct ata_probe_ent *ent);
extern void ata_host_set_remove(struct ata_host_set *host_set);
extern int ata_scsi_detect(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 int ata_scsi_error(struct Scsi_Host *host);
extern int ata_scsi_release(struct Scsi_Host *host);
extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
/*
 * Default driver ops implementations
 */
extern void ata_tf_load(struct ata_port *ap, struct ata_taskfile *tf);
extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
extern void ata_tf_to_fis(struct ata_taskfile *tf, u8 *fis, u8 pmp);
extern void ata_tf_from_fis(u8 *fis, struct ata_taskfile *tf);
extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
extern u8 ata_check_status(struct ata_port *ap);
extern u8 ata_altstatus(struct ata_port *ap);
extern u8 ata_chk_err(struct ata_port *ap);
extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf);
extern int ata_port_start (struct ata_port *ap);
extern void ata_port_stop (struct ata_port *ap);
extern void ata_host_stop (struct ata_host_set *host_set);
extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
extern void ata_qc_prep(struct ata_queued_cmd *qc);
extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
                unsigned int buflen);
extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
                 unsigned int n_elem);
extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
extern void ata_dev_id_string(u16 *id, unsigned char *s,
                              unsigned int ofs, unsigned int len);
extern void ata_dev_config(struct ata_port *ap, unsigned int i);
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_bmdma_irq_clear(struct ata_port *ap);
extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat);
extern void ata_eng_timeout(struct ata_port *ap);
extern void ata_scsi_simulate(u16 *id, 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);


#ifdef CONFIG_PCI
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 void ata_pci_host_stop (struct ata_host_set *host_set);
extern struct ata_probe_ent *
ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port);
extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits);

#endif /* CONFIG_PCI */


static inline unsigned int ata_tag_valid(unsigned int tag)
{
        return (tag < ATA_MAX_QUEUE) ? 1 : 0;
}

static inline unsigned int ata_dev_present(struct ata_device *dev)
{
        return ((dev->class == ATA_DEV_ATA) ||
                (dev->class == ATA_DEV_ATAPI));
}

static inline u8 ata_chk_status(struct ata_port *ap)
{
        return ap->ops->check_status(ap);
}


/**
 *      ata_pause - Flush writes and pause 400 nanoseconds.
 *      @ap: Port to wait for.
 *
 *      LOCKING:
 *      Inherited from caller.
 */

static inline void ata_pause(struct ata_port *ap)
{
        ata_altstatus(ap);
        ndelay(400);
}


/**
 *      ata_busy_wait - Wait for a port status register
 *      @ap: Port to wait for.
 *
 *      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_busy_wait(struct ata_port *ap, unsigned int bits,
                               unsigned int max)
{
        u8 status;

        do {
                udelay(10);
                status = ata_chk_status(ap);
                max--;
        } while ((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_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);

        if (status & (ATA_BUSY | ATA_DRQ)) {
                unsigned long l = ap->ioaddr.status_addr;
                printk(KERN_WARNING
                       "ATA: abnormal status 0x%X on port 0x%lX\n",
                       status, l);
        }

        return status;
}

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 void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
{
        memset(tf, 0, sizeof(*tf));

        tf->ctl = ap->ctl;
        if (device == 0)
                tf->device = ATA_DEVICE_OBS;
        else
                tf->device = ATA_DEVICE_OBS | ATA_DEV1;
}


/**
 *      ata_irq_on - Enable interrupts on a port.
 *      @ap: Port on which interrupts are enabled.
 *
 *      Enable interrupts on a legacy IDE device using MMIO or PIO,
 *      wait for idle, clear any pending interrupts.
 *
 *      LOCKING:
 *      Inherited from caller.
 */

static inline u8 ata_irq_on(struct ata_port *ap)
{
        struct ata_ioports *ioaddr = &ap->ioaddr;
        u8 tmp;

        ap->ctl &= ~ATA_NIEN;
        ap->last_ctl = ap->ctl;

        if (ap->flags & ATA_FLAG_MMIO)
                writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
        else
                outb(ap->ctl, ioaddr->ctl_addr);
        tmp = ata_wait_idle(ap);

        ap->ops->irq_clear(ap);

        return tmp;
}


/**
 *      ata_irq_ack - Acknowledge a device interrupt.
 *      @ap: Port on which interrupts are enabled.
 *
 *      Wait up to 10 ms for legacy IDE device to become idle (BUSY
 *      or BUSY+DRQ clear).  Obtain dma status and port status from
 *      device.  Clear the interrupt.  Return port status.
 *
 *      LOCKING:
 */

static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
{
        unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
        u8 host_stat, post_stat, status;

        status = ata_busy_wait(ap, bits, 1000);
        if (status & bits)
                DPRINTK("abnormal status 0x%X\n", status);

        /* get controller status; clear intr, err bits */
        if (ap->flags & ATA_FLAG_MMIO) {
                void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
                host_stat = readb(mmio + ATA_DMA_STATUS);
                writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
                       mmio + ATA_DMA_STATUS);

                post_stat = readb(mmio + ATA_DMA_STATUS);
        } else {
                host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
                outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
                     ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

                post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
        }

        VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
                host_stat, post_stat, status);

        return status;
}

static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
{
        return ap->ops->scr_read(ap, reg);
}

static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
{
        ap->ops->scr_write(ap, reg, val);
}

static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
                                   u32 val)
{
        ap->ops->scr_write(ap, reg, val);
        (void) ap->ops->scr_read(ap, reg);
}

static inline unsigned int sata_dev_present(struct ata_port *ap)
{
        return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
}

static inline int ata_try_flush_cache(struct ata_device *dev)
{
        return ata_id_wcache_enabled(dev->id) ||
               ata_id_has_flush(dev->id) ||
               ata_id_has_flush_ext(dev->id);
}

#endif /* __LINUX_LIBATA_H__ */