/*

   *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
   *  Copyright 2003-2004 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.*
   *
   *  Hardware documentation available from http://www.t13.org/
   *

   */
  
  #ifndef __LINUX_ATA_H__
  #define __LINUX_ATA_H__

  #include <linux/kernel.h>
  #include <linux/string.h>

  #include <linux/types.h>

  #include <asm/byteorder.h>

  
  /* defines only for the constants which don't work well as enums */
  #define ATA_DMA_BOUNDARY	0xffffUL
  #define ATA_DMA_MASK		0xffffffffULL
  
  enum {
  	/* various global constants */
  	ATA_MAX_DEVICES		= 2,	/* per bus/port */
  	ATA_MAX_PRD		= 256,	/* we could make these 256/256 */
  	ATA_SECT_SIZE		= 512,

  	ATA_MAX_SECTORS_128	= 128,

  	ATA_MAX_SECTORS		= 256,
  	ATA_MAX_SECTORS_LBA48	= 65535,/* TODO: 65536? */

  	ATA_MAX_SECTORS_TAPE	= 65535,

  
  	ATA_ID_WORDS		= 256,

  	ATA_ID_CONFIG		= 0,
  	ATA_ID_CYLS		= 1,
  	ATA_ID_HEADS		= 3,
  	ATA_ID_SECTORS		= 6,

  	ATA_ID_SERNO		= 10,

  	ATA_ID_BUF_SIZE		= 21,

  	ATA_ID_FW_REV		= 23,
  	ATA_ID_PROD		= 27,

  	ATA_ID_MAX_MULTSECT	= 47,
  	ATA_ID_DWORD_IO		= 48,
  	ATA_ID_CAPABILITY	= 49,

  	ATA_ID_OLD_PIO_MODES	= 51,

  	ATA_ID_OLD_DMA_MODES	= 52,

  	ATA_ID_FIELD_VALID	= 53,

  	ATA_ID_CUR_CYLS		= 54,
  	ATA_ID_CUR_HEADS	= 55,
  	ATA_ID_CUR_SECTORS	= 56,
  	ATA_ID_MULTSECT		= 59,
  	ATA_ID_LBA_CAPACITY	= 60,
  	ATA_ID_SWDMA_MODES	= 62,

  	ATA_ID_MWDMA_MODES	= 63,

  	ATA_ID_PIO_MODES	= 64,
  	ATA_ID_EIDE_DMA_MIN	= 65,

  	ATA_ID_EIDE_DMA_TIME	= 66,

  	ATA_ID_EIDE_PIO		= 67,
  	ATA_ID_EIDE_PIO_IORDY	= 68,

  	ATA_ID_ADDITIONAL_SUPP	= 69,

  	ATA_ID_QUEUE_DEPTH	= 75,

  	ATA_ID_MAJOR_VER	= 80,

  	ATA_ID_COMMAND_SET_1	= 82,
  	ATA_ID_COMMAND_SET_2	= 83,
  	ATA_ID_CFSSE		= 84,
  	ATA_ID_CFS_ENABLE_1	= 85,
  	ATA_ID_CFS_ENABLE_2	= 86,
  	ATA_ID_CSF_DEFAULT	= 87,
  	ATA_ID_UDMA_MODES	= 88,
  	ATA_ID_HW_CONFIG	= 93,
  	ATA_ID_SPG		= 98,
  	ATA_ID_LBA_CAPACITY_2	= 100,

  	ATA_ID_SECTOR_SIZE	= 106,

  	ATA_ID_LAST_LUN		= 126,
  	ATA_ID_DLF		= 128,
  	ATA_ID_CSFO		= 129,
  	ATA_ID_CFA_POWER	= 160,

  	ATA_ID_CFA_KEY_MGMT	= 162,
  	ATA_ID_CFA_MODES	= 163,

  	ATA_ID_DATA_SET_MGMT	= 169,

  	ATA_ID_ROT_SPEED	= 217,

  	ATA_ID_PIO4		= (1 << 1),

  	ATA_ID_SERNO_LEN	= 20,
  	ATA_ID_FW_REV_LEN	= 8,
  	ATA_ID_PROD_LEN		= 40,

  	ATA_PCI_CTL_OFS		= 2,

  
  	ATA_PIO0		= (1 << 0),
  	ATA_PIO1		= ATA_PIO0 | (1 << 1),
  	ATA_PIO2		= ATA_PIO1 | (1 << 2),
  	ATA_PIO3		= ATA_PIO2 | (1 << 3),
  	ATA_PIO4		= ATA_PIO3 | (1 << 4),
  	ATA_PIO5		= ATA_PIO4 | (1 << 5),
  	ATA_PIO6		= ATA_PIO5 | (1 << 6),

  	ATA_PIO4_ONLY		= (1 << 4),

  	ATA_SWDMA0		= (1 << 0),
  	ATA_SWDMA1		= ATA_SWDMA0 | (1 << 1),
  	ATA_SWDMA2		= ATA_SWDMA1 | (1 << 2),
  
  	ATA_SWDMA2_ONLY		= (1 << 2),
  
  	ATA_MWDMA0		= (1 << 0),
  	ATA_MWDMA1		= ATA_MWDMA0 | (1 << 1),
  	ATA_MWDMA2		= ATA_MWDMA1 | (1 << 2),

  	ATA_MWDMA3		= ATA_MWDMA2 | (1 << 3),
  	ATA_MWDMA4		= ATA_MWDMA3 | (1 << 4),

  
  	ATA_MWDMA12_ONLY	= (1 << 1) | (1 << 2),
  	ATA_MWDMA2_ONLY		= (1 << 2),

  	ATA_UDMA0		= (1 << 0),
  	ATA_UDMA1		= ATA_UDMA0 | (1 << 1),
  	ATA_UDMA2		= ATA_UDMA1 | (1 << 2),
  	ATA_UDMA3		= ATA_UDMA2 | (1 << 3),
  	ATA_UDMA4		= ATA_UDMA3 | (1 << 4),
  	ATA_UDMA5		= ATA_UDMA4 | (1 << 5),
  	ATA_UDMA6		= ATA_UDMA5 | (1 << 6),
  	ATA_UDMA7		= ATA_UDMA6 | (1 << 7),
  	/* ATA_UDMA7 is just for completeness... doesn't exist (yet?).  */

  	ATA_UDMA24_ONLY		= (1 << 2) | (1 << 4),

  	ATA_UDMA_MASK_40C	= ATA_UDMA2,	/* udma0-2 */
  
  	/* DMA-related */
  	ATA_PRD_SZ		= 8,
  	ATA_PRD_TBL_SZ		= (ATA_MAX_PRD * ATA_PRD_SZ),
  	ATA_PRD_EOT		= (1 << 31),	/* end-of-table flag */
  
  	ATA_DMA_TABLE_OFS	= 4,
  	ATA_DMA_STATUS		= 2,
  	ATA_DMA_CMD		= 0,
  	ATA_DMA_WR		= (1 << 3),
  	ATA_DMA_START		= (1 << 0),
  	ATA_DMA_INTR		= (1 << 2),
  	ATA_DMA_ERR		= (1 << 1),
  	ATA_DMA_ACTIVE		= (1 << 0),
  
  	/* bits in ATA command block registers */
  	ATA_HOB			= (1 << 7),	/* LBA48 selector */
  	ATA_NIEN		= (1 << 1),	/* disable-irq flag */
  	ATA_LBA			= (1 << 6),	/* LBA28 selector */
  	ATA_DEV1		= (1 << 4),	/* Select Device 1 (slave) */
  	ATA_DEVICE_OBS		= (1 << 7) | (1 << 5), /* obs bits in dev reg */
  	ATA_DEVCTL_OBS		= (1 << 3),	/* obsolete bit in devctl reg */
  	ATA_BUSY		= (1 << 7),	/* BSY status bit */
  	ATA_DRDY		= (1 << 6),	/* device ready */
  	ATA_DF			= (1 << 5),	/* device fault */

  	ATA_DSC			= (1 << 4),	/* drive seek complete */

  	ATA_DRQ			= (1 << 3),	/* data request i/o */

  	ATA_CORR		= (1 << 2),	/* corrected data error */
  	ATA_IDX			= (1 << 1),	/* index */

  	ATA_ERR			= (1 << 0),	/* have an error */
  	ATA_SRST		= (1 << 2),	/* software reset */

  	ATA_ICRC		= (1 << 7),	/* interface CRC error */

  	ATA_BBK			= ATA_ICRC,	/* pre-EIDE: block marked bad */

  	ATA_UNC			= (1 << 6),	/* uncorrectable media error */

  	ATA_MC			= (1 << 5),	/* media changed */

  	ATA_IDNF		= (1 << 4),	/* ID not found */

  	ATA_MCR			= (1 << 3),	/* media change requested */

  	ATA_ABORTED		= (1 << 2),	/* command aborted */

  	ATA_TRK0NF		= (1 << 1),	/* track 0 not found */
  	ATA_AMNF		= (1 << 0),	/* address mark not found */
  	ATAPI_LFS		= 0xF0,		/* last failed sense */
  	ATAPI_EOM		= ATA_TRK0NF,	/* end of media */
  	ATAPI_ILI		= ATA_AMNF,	/* illegal length indication */
  	ATAPI_IO		= (1 << 1),
  	ATAPI_COD		= (1 << 0),

  
  	/* ATA command block registers */
  	ATA_REG_DATA		= 0x00,
  	ATA_REG_ERR		= 0x01,
  	ATA_REG_NSECT		= 0x02,
  	ATA_REG_LBAL		= 0x03,
  	ATA_REG_LBAM		= 0x04,
  	ATA_REG_LBAH		= 0x05,
  	ATA_REG_DEVICE		= 0x06,
  	ATA_REG_STATUS		= 0x07,
  
  	ATA_REG_FEATURE		= ATA_REG_ERR, /* and their aliases */
  	ATA_REG_CMD		= ATA_REG_STATUS,
  	ATA_REG_BYTEL		= ATA_REG_LBAM,
  	ATA_REG_BYTEH		= ATA_REG_LBAH,
  	ATA_REG_DEVSEL		= ATA_REG_DEVICE,
  	ATA_REG_IRQ		= ATA_REG_NSECT,
  
  	/* ATA device commands */

  	ATA_CMD_DEV_RESET	= 0x08, /* ATAPI device reset */

  	ATA_CMD_CHK_POWER	= 0xE5, /* check power mode */

  	ATA_CMD_STANDBY		= 0xE2, /* place in standby power mode */
  	ATA_CMD_IDLE		= 0xE3, /* place in idle power mode */

  	ATA_CMD_EDD		= 0x90,	/* execute device diagnostic */

  	ATA_CMD_DOWNLOAD_MICRO  = 0x92,
  	ATA_CMD_NOP		= 0x00,

  	ATA_CMD_FLUSH		= 0xE7,
  	ATA_CMD_FLUSH_EXT	= 0xEA,
  	ATA_CMD_ID_ATA		= 0xEC,
  	ATA_CMD_ID_ATAPI	= 0xA1,

  	ATA_CMD_SERVICE		= 0xA2,

  	ATA_CMD_READ		= 0xC8,
  	ATA_CMD_READ_EXT	= 0x25,

  	ATA_CMD_READ_QUEUED	= 0x26,
  	ATA_CMD_READ_STREAM_EXT	= 0x2B,
  	ATA_CMD_READ_STREAM_DMA_EXT = 0x2A,

  	ATA_CMD_WRITE		= 0xCA,
  	ATA_CMD_WRITE_EXT	= 0x35,

  	ATA_CMD_WRITE_QUEUED	= 0x36,
  	ATA_CMD_WRITE_STREAM_EXT = 0x3B,
  	ATA_CMD_WRITE_STREAM_DMA_EXT = 0x3A,

  	ATA_CMD_WRITE_FUA_EXT	= 0x3D,

  	ATA_CMD_WRITE_QUEUED_FUA_EXT = 0x3E,

  	ATA_CMD_FPDMA_READ	= 0x60,
  	ATA_CMD_FPDMA_WRITE	= 0x61,

  	ATA_CMD_PIO_READ	= 0x20,
  	ATA_CMD_PIO_READ_EXT	= 0x24,
  	ATA_CMD_PIO_WRITE	= 0x30,
  	ATA_CMD_PIO_WRITE_EXT	= 0x34,

  	ATA_CMD_READ_MULTI	= 0xC4,
  	ATA_CMD_READ_MULTI_EXT	= 0x29,
  	ATA_CMD_WRITE_MULTI	= 0xC5,
  	ATA_CMD_WRITE_MULTI_EXT	= 0x39,

  	ATA_CMD_WRITE_MULTI_FUA_EXT = 0xCE,

  	ATA_CMD_SET_FEATURES	= 0xEF,

  	ATA_CMD_SET_MULTI	= 0xC6,

  	ATA_CMD_PACKET		= 0xA0,
  	ATA_CMD_VERIFY		= 0x40,
  	ATA_CMD_VERIFY_EXT	= 0x42,

  	ATA_CMD_WRITE_UNCORR_EXT = 0x45,

  	ATA_CMD_STANDBYNOW1	= 0xE0,
  	ATA_CMD_IDLEIMMEDIATE	= 0xE1,

  	ATA_CMD_SLEEP		= 0xE6,

  	ATA_CMD_INIT_DEV_PARAMS	= 0x91,

  	ATA_CMD_READ_NATIVE_MAX	= 0xF8,
  	ATA_CMD_READ_NATIVE_MAX_EXT = 0x27,

  	ATA_CMD_SET_MAX		= 0xF9,
  	ATA_CMD_SET_MAX_EXT	= 0x37,

  	ATA_CMD_READ_LOG_EXT	= 0x2F,
  	ATA_CMD_WRITE_LOG_EXT	= 0x3F,
  	ATA_CMD_READ_LOG_DMA_EXT = 0x47,
  	ATA_CMD_WRITE_LOG_DMA_EXT = 0x57,
  	ATA_CMD_TRUSTED_RCV	= 0x5C,
  	ATA_CMD_TRUSTED_RCV_DMA = 0x5D,
  	ATA_CMD_TRUSTED_SND	= 0x5E,
  	ATA_CMD_TRUSTED_SND_DMA = 0x5F,

  	ATA_CMD_PMP_READ	= 0xE4,
  	ATA_CMD_PMP_WRITE	= 0xE8,

  	ATA_CMD_CONF_OVERLAY	= 0xB1,

  	ATA_CMD_SEC_SET_PASS	= 0xF1,
  	ATA_CMD_SEC_UNLOCK	= 0xF2,
  	ATA_CMD_SEC_ERASE_PREP	= 0xF3,
  	ATA_CMD_SEC_ERASE_UNIT	= 0xF4,

  	ATA_CMD_SEC_FREEZE_LOCK	= 0xF5,

  	ATA_CMD_SEC_DISABLE_PASS = 0xF6,
  	ATA_CMD_CONFIG_STREAM	= 0x51,

  	ATA_CMD_SMART		= 0xB0,
  	ATA_CMD_MEDIA_LOCK	= 0xDE,
  	ATA_CMD_MEDIA_UNLOCK	= 0xDF,

  	ATA_CMD_DSM		= 0x06,

  	ATA_CMD_CHK_MED_CRD_TYP = 0xD1,
  	ATA_CMD_CFA_REQ_EXT_ERR = 0x03,
  	ATA_CMD_CFA_WRITE_NE	= 0x38,
  	ATA_CMD_CFA_TRANS_SECT	= 0x87,
  	ATA_CMD_CFA_ERASE	= 0xC0,
  	ATA_CMD_CFA_WRITE_MULT_NE = 0xCD,

  	/* marked obsolete in the ATA/ATAPI-7 spec */
  	ATA_CMD_RESTORE		= 0x10,

  
  	/* READ_LOG_EXT pages */
  	ATA_LOG_SATA_NCQ	= 0x10,

  	/* READ/WRITE LONG (obsolete) */
  	ATA_CMD_READ_LONG	= 0x22,
  	ATA_CMD_READ_LONG_ONCE	= 0x23,
  	ATA_CMD_WRITE_LONG	= 0x32,
  	ATA_CMD_WRITE_LONG_ONCE	= 0x33,

  	/* SETFEATURES stuff */
  	SETFEATURES_XFER	= 0x03,
  	XFER_UDMA_7		= 0x47,
  	XFER_UDMA_6		= 0x46,
  	XFER_UDMA_5		= 0x45,
  	XFER_UDMA_4		= 0x44,
  	XFER_UDMA_3		= 0x43,
  	XFER_UDMA_2		= 0x42,
  	XFER_UDMA_1		= 0x41,
  	XFER_UDMA_0		= 0x40,

  	XFER_MW_DMA_4		= 0x24,	/* CFA only */
  	XFER_MW_DMA_3		= 0x23,	/* CFA only */

  	XFER_MW_DMA_2		= 0x22,
  	XFER_MW_DMA_1		= 0x21,
  	XFER_MW_DMA_0		= 0x20,

  	XFER_SW_DMA_2		= 0x12,
  	XFER_SW_DMA_1		= 0x11,
  	XFER_SW_DMA_0		= 0x10,

  	XFER_PIO_6		= 0x0E,	/* CFA only */
  	XFER_PIO_5		= 0x0D,	/* CFA only */

  	XFER_PIO_4		= 0x0C,
  	XFER_PIO_3		= 0x0B,
  	XFER_PIO_2		= 0x0A,
  	XFER_PIO_1		= 0x09,
  	XFER_PIO_0		= 0x08,

  	XFER_PIO_SLOW		= 0x00,

  	SETFEATURES_WC_ON	= 0x02, /* Enable write cache */
  	SETFEATURES_WC_OFF	= 0x82, /* Disable write cache */

  	/* Enable/Disable Automatic Acoustic Management */
  	SETFEATURES_AAM_ON	= 0x42,
  	SETFEATURES_AAM_OFF	= 0xC2,

  	SETFEATURES_SPINUP	= 0x07, /* Spin-up drive */

  	SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
  	SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
  
  	/* SETFEATURE Sector counts for SATA features */

  	SATA_FPDMA_OFFSET	= 0x01,	/* FPDMA non-zero buffer offsets */

  	SATA_FPDMA_AA		= 0x02, /* FPDMA Setup FIS Auto-Activate */
  	SATA_DIPM		= 0x03,	/* Device Initiated Power Management */

  	SATA_FPDMA_IN_ORDER	= 0x04,	/* FPDMA in-order data delivery */

  	SATA_AN			= 0x05,	/* Asynchronous Notification */

  	SATA_SSP		= 0x06,	/* Software Settings Preservation */

  	/* feature values for SET_MAX */
  	ATA_SET_MAX_ADDR	= 0x00,
  	ATA_SET_MAX_PASSWD	= 0x01,
  	ATA_SET_MAX_LOCK	= 0x02,
  	ATA_SET_MAX_UNLOCK	= 0x03,
  	ATA_SET_MAX_FREEZE_LOCK	= 0x04,
  
  	/* feature values for DEVICE CONFIGURATION OVERLAY */
  	ATA_DCO_RESTORE		= 0xC0,
  	ATA_DCO_FREEZE_LOCK	= 0xC1,
  	ATA_DCO_IDENTIFY	= 0xC2,
  	ATA_DCO_SET		= 0xC3,

  	/* feature values for SMART */
  	ATA_SMART_ENABLE	= 0xD8,
  	ATA_SMART_READ_VALUES	= 0xD0,
  	ATA_SMART_READ_THRESHOLDS = 0xD1,

  	/* feature values for Data Set Management */
  	ATA_DSM_TRIM		= 0x01,

  	/* password used in LBA Mid / LBA High for executing SMART commands */
  	ATA_SMART_LBAM_PASS	= 0x4F,
  	ATA_SMART_LBAH_PASS	= 0xC2,

  	/* ATAPI stuff */
  	ATAPI_PKT_DMA		= (1 << 0),
  	ATAPI_DMADIR		= (1 << 2),	/* ATAPI data dir:
  						   0=to device, 1=to host */
  	ATAPI_CDB_LEN		= 16,

  	/* PMP stuff */
  	SATA_PMP_MAX_PORTS	= 15,
  	SATA_PMP_CTRL_PORT	= 15,
  
  	SATA_PMP_GSCR_DWORDS	= 128,
  	SATA_PMP_GSCR_PROD_ID	= 0,
  	SATA_PMP_GSCR_REV	= 1,
  	SATA_PMP_GSCR_PORT_INFO	= 2,
  	SATA_PMP_GSCR_ERROR	= 32,
  	SATA_PMP_GSCR_ERROR_EN	= 33,
  	SATA_PMP_GSCR_FEAT	= 64,
  	SATA_PMP_GSCR_FEAT_EN	= 96,
  
  	SATA_PMP_PSCR_STATUS	= 0,
  	SATA_PMP_PSCR_ERROR	= 1,
  	SATA_PMP_PSCR_CONTROL	= 2,
  
  	SATA_PMP_FEAT_BIST	= (1 << 0),
  	SATA_PMP_FEAT_PMREQ	= (1 << 1),
  	SATA_PMP_FEAT_DYNSSC	= (1 << 2),
  	SATA_PMP_FEAT_NOTIFY	= (1 << 3),

  	/* cable types */
  	ATA_CBL_NONE		= 0,
  	ATA_CBL_PATA40		= 1,
  	ATA_CBL_PATA80		= 2,

  	ATA_CBL_PATA40_SHORT	= 3,	/* 40 wire cable to high UDMA spec */
  	ATA_CBL_PATA_UNK	= 4,	/* don't know, maybe 80c? */
  	ATA_CBL_PATA_IGN	= 5,	/* don't know, ignore cable handling */
  	ATA_CBL_SATA		= 6,

  
  	/* SATA Status and Control Registers */
  	SCR_STATUS		= 0,
  	SCR_ERROR		= 1,
  	SCR_CONTROL		= 2,
  	SCR_ACTIVE		= 3,
  	SCR_NOTIFICATION	= 4,

  	/* SError bits */
  	SERR_DATA_RECOVERED	= (1 << 0), /* recovered data error */
  	SERR_COMM_RECOVERED	= (1 << 1), /* recovered comm failure */
  	SERR_DATA		= (1 << 8), /* unrecovered data error */
  	SERR_PERSISTENT		= (1 << 9), /* persistent data/comm error */
  	SERR_PROTOCOL		= (1 << 10), /* protocol violation */
  	SERR_INTERNAL		= (1 << 11), /* host internal error */
  	SERR_PHYRDY_CHG		= (1 << 16), /* PHY RDY changed */

  	SERR_PHY_INT_ERR	= (1 << 17), /* PHY internal error */
  	SERR_COMM_WAKE		= (1 << 18), /* Comm wake */
  	SERR_10B_8B_ERR		= (1 << 19), /* 10b to 8b decode error */
  	SERR_DISPARITY		= (1 << 20), /* Disparity */
  	SERR_CRC		= (1 << 21), /* CRC error */
  	SERR_HANDSHAKE		= (1 << 22), /* Handshake error */
  	SERR_LINK_SEQ_ERR	= (1 << 23), /* Link sequence error */
  	SERR_TRANS_ST_ERROR	= (1 << 24), /* Transport state trans. error */
  	SERR_UNRECOG_FIS	= (1 << 25), /* Unrecognized FIS */

  	SERR_DEV_XCHG		= (1 << 26), /* device exchanged */

  	/* 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 */

  
  	/* protocol flags */
  	ATA_PROT_FLAG_PIO	= (1 << 0), /* is PIO */
  	ATA_PROT_FLAG_DMA	= (1 << 1), /* is DMA */
  	ATA_PROT_FLAG_DATA	= ATA_PROT_FLAG_PIO | ATA_PROT_FLAG_DMA,
  	ATA_PROT_FLAG_NCQ	= (1 << 2), /* is NCQ */
  	ATA_PROT_FLAG_ATAPI	= (1 << 3), /* is ATAPI */

  };
  
  enum ata_tf_protocols {
  	/* ATA taskfile protocols */
  	ATA_PROT_UNKNOWN,	/* unknown/invalid */
  	ATA_PROT_NODATA,	/* no data */

  	ATA_PROT_PIO,		/* PIO data xfer */

  	ATA_PROT_DMA,		/* DMA */

  	ATA_PROT_NCQ,		/* NCQ */

  	ATAPI_PROT_NODATA,	/* packet command, no data */
  	ATAPI_PROT_PIO,		/* packet command, PIO data xfer*/
  	ATAPI_PROT_DMA,		/* packet command with special DMA sauce */

  };
  
  enum ata_ioctls {
  	ATA_IOC_GET_IO32	= 0x309,
  	ATA_IOC_SET_IO32	= 0x324,
  };
  
  /* core structures */

  struct ata_bmdma_prd {

  	__le32			addr;
  	__le32			flags_len;

  };
  
  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 */
  };

  /*
   * protocol tests
   */
  static inline unsigned int ata_prot_flags(u8 prot)
  {
  	switch (prot) {
  	case ATA_PROT_NODATA:
  		return 0;
  	case ATA_PROT_PIO:
  		return ATA_PROT_FLAG_PIO;
  	case ATA_PROT_DMA:
  		return ATA_PROT_FLAG_DMA;
  	case ATA_PROT_NCQ:
  		return ATA_PROT_FLAG_DMA | ATA_PROT_FLAG_NCQ;

  	case ATAPI_PROT_NODATA:

  		return ATA_PROT_FLAG_ATAPI;

  	case ATAPI_PROT_PIO:

  		return ATA_PROT_FLAG_ATAPI | ATA_PROT_FLAG_PIO;

  	case ATAPI_PROT_DMA:

  		return ATA_PROT_FLAG_ATAPI | ATA_PROT_FLAG_DMA;
  	}
  	return 0;
  }
  
  static inline int ata_is_atapi(u8 prot)
  {
  	return ata_prot_flags(prot) & ATA_PROT_FLAG_ATAPI;
  }
  
  static inline int ata_is_nodata(u8 prot)
  {
  	return !(ata_prot_flags(prot) & ATA_PROT_FLAG_DATA);
  }
  
  static inline int ata_is_pio(u8 prot)
  {
  	return ata_prot_flags(prot) & ATA_PROT_FLAG_PIO;
  }
  
  static inline int ata_is_dma(u8 prot)
  {
  	return ata_prot_flags(prot) & ATA_PROT_FLAG_DMA;
  }
  
  static inline int ata_is_ncq(u8 prot)
  {
  	return ata_prot_flags(prot) & ATA_PROT_FLAG_NCQ;
  }
  
  static inline int ata_is_data(u8 prot)
  {
  	return ata_prot_flags(prot) & ATA_PROT_FLAG_DATA;
  }
  
  /*
   * id tests
   */

  #define ata_id_is_ata(id)	(((id)[ATA_ID_CONFIG] & (1 << 15)) == 0)
  #define ata_id_has_lba(id)	((id)[ATA_ID_CAPABILITY] & (1 << 9))
  #define ata_id_has_dma(id)	((id)[ATA_ID_CAPABILITY] & (1 << 8))

  #define ata_id_has_ncq(id)	((id)[76] & (1 << 8))

  #define ata_id_queue_depth(id)	(((id)[ATA_ID_QUEUE_DEPTH] & 0x1f) + 1)
  #define ata_id_removeable(id)	((id)[ATA_ID_CONFIG] & (1 << 7))

  #define ata_id_has_atapi_AN(id)	\

  	( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
  	  ((id)[78] & (1 << 5)) )

  #define ata_id_has_fpdma_aa(id)	\
  	( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
  	  ((id)[78] & (1 << 2)) )

  #define ata_id_iordy_disable(id) ((id)[ATA_ID_CAPABILITY] & (1 << 10))
  #define ata_id_has_iordy(id) ((id)[ATA_ID_CAPABILITY] & (1 << 11))

  #define ata_id_u32(id,n)	\
  	(((u32) (id)[(n) + 1] << 16) | ((u32) (id)[(n)]))
  #define ata_id_u64(id,n)	\
  	( ((u64) (id)[(n) + 3] << 48) |	\
  	  ((u64) (id)[(n) + 2] << 32) |	\
  	  ((u64) (id)[(n) + 1] << 16) |	\
  	  ((u64) (id)[(n) + 0]) )

  #define ata_id_cdb_intr(id)	(((id)[ATA_ID_CONFIG] & 0x60) == 0x20)

  static inline bool ata_id_has_hipm(const u16 *id)
  {
  	u16 val = id[76];
  
  	if (val == 0 || val == 0xffff)
  		return false;
  
  	return val & (1 << 9);
  }
  
  static inline bool ata_id_has_dipm(const u16 *id)
  {
  	u16 val = id[78];
  
  	if (val == 0 || val == 0xffff)
  		return false;
  
  	return val & (1 << 3);
  }

  static inline int ata_id_has_fua(const u16 *id)
  {

  	if ((id[ATA_ID_CFSSE] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_CFSSE] & (1 << 6);

  }
  
  static inline int ata_id_has_flush(const u16 *id)
  {

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_COMMAND_SET_2] & (1 << 12);

  }

  static inline int ata_id_flush_enabled(const u16 *id)
  {
  	if (ata_id_has_flush(id) == 0)
  		return 0;
  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)
  		return 0;
  	return id[ATA_ID_CFS_ENABLE_2] & (1 << 12);
  }

  static inline int ata_id_has_flush_ext(const u16 *id)
  {

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_COMMAND_SET_2] & (1 << 13);

  }

  static inline int ata_id_flush_ext_enabled(const u16 *id)
  {
  	if (ata_id_has_flush_ext(id) == 0)
  		return 0;
  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)
  		return 0;
  	/*
  	 * some Maxtor disks have bit 13 defined incorrectly
  	 * so check bit 10 too
  	 */
  	return (id[ATA_ID_CFS_ENABLE_2] & 0x2400) == 0x2400;
  }

  static inline int ata_id_has_large_logical_sectors(const u16 *id)
  {
  	if ((id[ATA_ID_SECTOR_SIZE] & 0xc000) != 0x4000)
  		return 0;
  	return id[ATA_ID_SECTOR_SIZE] & (1 << 13);
  }

  static inline u16 ata_id_logical_per_physical_sectors(const u16 *id)

  {

  	return 1 << (id[ATA_ID_SECTOR_SIZE] & 0xf);

  }

  static inline int ata_id_has_lba48(const u16 *id)
  {

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;

  	if (!ata_id_u64(id, ATA_ID_LBA_CAPACITY_2))

  		return 0;

  	return id[ATA_ID_COMMAND_SET_2] & (1 << 10);

  }

  static inline int ata_id_lba48_enabled(const u16 *id)
  {
  	if (ata_id_has_lba48(id) == 0)
  		return 0;
  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)
  		return 0;
  	return id[ATA_ID_CFS_ENABLE_2] & (1 << 10);
  }

  static inline int ata_id_hpa_enabled(const u16 *id)
  {
  	/* Yes children, word 83 valid bits cover word 82 data */

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;
  	/* And 87 covers 85-87 */

  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)

  		return 0;
  	/* Check command sets enabled as well as supported */

  	if ((id[ATA_ID_CFS_ENABLE_1] & (1 << 10)) == 0)

  		return 0;

  	return id[ATA_ID_COMMAND_SET_1] & (1 << 10);

  }
  
  static inline int ata_id_has_wcache(const u16 *id)
  {
  	/* Yes children, word 83 valid bits cover word 82 data */

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_COMMAND_SET_1] & (1 << 5);

  }
  
  static inline int ata_id_has_pm(const u16 *id)
  {

  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_COMMAND_SET_1] & (1 << 3);

  }
  
  static inline int ata_id_rahead_enabled(const u16 *id)
  {

  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_CFS_ENABLE_1] & (1 << 6);

  }
  
  static inline int ata_id_wcache_enabled(const u16 *id)
  {

  	if ((id[ATA_ID_CSF_DEFAULT] & 0xC000) != 0x4000)

  		return 0;

  	return id[ATA_ID_CFS_ENABLE_1] & (1 << 5);

  }
  
  /**
   *	ata_id_major_version	-	get ATA level of drive
   *	@id: Identify data
   *
   *	Caveats:
   *		ATA-1 considers identify optional
   *		ATA-2 introduces mandatory identify
   *		ATA-3 introduces word 80 and accurate reporting
   *
   *	The practical impact of this is that ata_id_major_version cannot

   *	reliably report on drives below ATA3.

   */

  static inline unsigned int ata_id_major_version(const u16 *id)
  {
  	unsigned int mver;

  	if (id[ATA_ID_MAJOR_VER] == 0xFFFF)
  		return 0;

  	for (mver = 14; mver >= 1; mver--)
  		if (id[ATA_ID_MAJOR_VER] & (1 << mver))
  			break;
  	return mver;
  }

  static inline int ata_id_is_sata(const u16 *id)
  {

  	/*
  	 * See if word 93 is 0 AND drive is at least ATA-5 compatible
  	 * verifying that word 80 by casting it to a signed type --
  	 * this trick allows us to filter out the reserved values of
  	 * 0x0000 and 0xffff along with the earlier ATA revisions...
  	 */
  	if (id[ATA_ID_HW_CONFIG] == 0 && (short)id[ATA_ID_MAJOR_VER] >= 0x0020)
  		return 1;
  	return 0;

  }

  static inline int ata_id_has_tpm(const u16 *id)
  {
  	/* The TPM bits are only valid on ATA8 */
  	if (ata_id_major_version(id) < 8)
  		return 0;
  	if ((id[48] & 0xC000) != 0x4000)
  		return 0;
  	return id[48] & (1 << 0);
  }
  
  static inline int ata_id_has_dword_io(const u16 *id)
  {
  	/* ATA 8 reuses this flag for "trusted" computing */
  	if (ata_id_major_version(id) > 7)
  		return 0;

  	if (id[ATA_ID_DWORD_IO] & (1 << 0))

  		return 1;
  	return 0;
  }

  static inline int ata_id_has_unload(const u16 *id)
  {
  	if (ata_id_major_version(id) >= 7 &&
  	    (id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&
  	    id[ATA_ID_CFSSE] & (1 << 13))
  		return 1;
  	return 0;
  }

  static inline int ata_id_form_factor(const u16 *id)
  {
  	u16 val = id[168];
  
  	if (ata_id_major_version(id) < 7 || val == 0 || val == 0xffff)
  		return 0;
  
  	val &= 0xf;
  
  	if (val > 5)
  		return 0;
  
  	return val;
  }
  
  static inline int ata_id_rotation_rate(const u16 *id)
  {
  	u16 val = id[217];
  
  	if (ata_id_major_version(id) < 7 || val == 0 || val == 0xffff)
  		return 0;
  
  	if (val > 1 && val < 0x401)
  		return 0;
  
  	return val;
  }

  static inline int ata_id_has_trim(const u16 *id)
  {
  	if (ata_id_major_version(id) >= 7 &&
  	    (id[ATA_ID_DATA_SET_MGMT] & 1))
  		return 1;
  	return 0;
  }

  static inline int ata_id_has_zero_after_trim(const u16 *id)
  {
  	/* DSM supported, deterministic read, and read zero after trim set */
  	if (ata_id_has_trim(id) &&
  	    (id[ATA_ID_ADDITIONAL_SUPP] & 0x4020) == 0x4020)
  		return 1;
  
  	return 0;
  }

  static inline int ata_id_current_chs_valid(const u16 *id)

  {

  	/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command
  	   has not been issued to the device then the values of

  	   id[ATA_ID_CUR_CYLS] to id[ATA_ID_CUR_SECTORS] are vendor specific. */
  	return (id[ATA_ID_FIELD_VALID] & 1) && /* Current translation valid */
  		id[ATA_ID_CUR_CYLS] &&  /* cylinders in current translation */
  		id[ATA_ID_CUR_HEADS] &&  /* heads in current translation */
  		id[ATA_ID_CUR_HEADS] <= 16 &&
  		id[ATA_ID_CUR_SECTORS];    /* sectors in current translation */

  }

  static inline int ata_id_is_cfa(const u16 *id)
  {

  	if ((id[ATA_ID_CONFIG] == 0x848A) ||	/* Traditional CF */
  	    (id[ATA_ID_CONFIG] == 0x844A))	/* Delkin Devices CF */

  		return 1;

  	/*
  	 * CF specs don't require specific value in the word 0 anymore and yet
  	 * they forbid to report the ATA version in the word 80 and require the
  	 * CFA feature set support to be indicated in the word 83 in this case.
  	 * Unfortunately, some cards only follow either of this requirements,
  	 * and while those that don't indicate CFA feature support need some
  	 * sort of quirk list, it seems impractical for the ones that do...
  	 */
  	if ((id[ATA_ID_COMMAND_SET_2] & 0xC004) == 0x4004)

  		return 1;
  	return 0;
  }

  static inline int ata_id_is_ssd(const u16 *id)
  {
  	return id[ATA_ID_ROT_SPEED] == 0x01;
  }

  static inline int ata_id_pio_need_iordy(const u16 *id, const u8 pio)
  {
  	/* CF spec. r4.1 Table 22 says no IORDY on PIO5 and PIO6. */
  	if (pio > 4 && ata_id_is_cfa(id))
  		return 0;
  	/* For PIO3 and higher it is mandatory. */
  	if (pio > 2)
  		return 1;
  	/* Turn it on when possible. */
  	if (ata_id_has_iordy(id))
  		return 1;
  	return 0;
  }

  static inline int ata_drive_40wire(const u16 *dev_id)
  {

  	if (ata_id_is_sata(dev_id))

  		return 0;	/* SATA */

  	if ((dev_id[ATA_ID_HW_CONFIG] & 0xE000) == 0x6000)

  		return 0;	/* 80 wire */
  	return 1;
  }

  static inline int ata_drive_40wire_relaxed(const u16 *dev_id)
  {

  	if ((dev_id[ATA_ID_HW_CONFIG] & 0x2000) == 0x2000)

  		return 0;	/* 80 wire */
  	return 1;
  }

  static inline int atapi_cdb_len(const u16 *dev_id)

  {

  	u16 tmp = dev_id[ATA_ID_CONFIG] & 0x3;

  	switch (tmp) {
  	case 0:		return 12;
  	case 1:		return 16;
  	default:	return -1;
  	}
  }

  static inline int atapi_command_packet_set(const u16 *dev_id)
  {

  	return (dev_id[ATA_ID_CONFIG] >> 8) & 0x1f;

  }

  static inline int atapi_id_dmadir(const u16 *dev_id)
  {
  	return ata_id_major_version(dev_id) >= 7 && (dev_id[62] & 0x8000);
  }

  /*
   * ata_id_is_lba_capacity_ok() performs a sanity check on
   * the claimed LBA capacity value for the device.
   *
   * Returns 1 if LBA capacity looks sensible, 0 otherwise.
   *
   * It is called only once for each device.
   */
  static inline int ata_id_is_lba_capacity_ok(u16 *id)
  {
  	unsigned long lba_sects, chs_sects, head, tail;
  
  	/* No non-LBA info .. so valid! */
  	if (id[ATA_ID_CYLS] == 0)
  		return 1;
  
  	lba_sects = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
  
  	/*
  	 * The ATA spec tells large drives to return
  	 * C/H/S = 16383/16/63 independent of their size.
  	 * Some drives can be jumpered to use 15 heads instead of 16.
  	 * Some drives can be jumpered to use 4092 cyls instead of 16383.
  	 */
  	if ((id[ATA_ID_CYLS] == 16383 ||
  	     (id[ATA_ID_CYLS] == 4092 && id[ATA_ID_CUR_CYLS] == 16383)) &&
  	    id[ATA_ID_SECTORS] == 63 &&
  	    (id[ATA_ID_HEADS] == 15 || id[ATA_ID_HEADS] == 16) &&
  	    (lba_sects >= 16383 * 63 * id[ATA_ID_HEADS]))
  		return 1;
  
  	chs_sects = id[ATA_ID_CYLS] * id[ATA_ID_HEADS] * id[ATA_ID_SECTORS];
  
  	/* perform a rough sanity check on lba_sects: within 10% is OK */
  	if (lba_sects - chs_sects < chs_sects/10)
  		return 1;
  
  	/* some drives have the word order reversed */
  	head = (lba_sects >> 16) & 0xffff;
  	tail = lba_sects & 0xffff;
  	lba_sects = head | (tail << 16);
  
  	if (lba_sects - chs_sects < chs_sects/10) {
  		*(__le32 *)&id[ATA_ID_LBA_CAPACITY] = __cpu_to_le32(lba_sects);
  		return 1;	/* LBA capacity is (now) good */
  	}
  
  	return 0;	/* LBA capacity value may be bad */
  }

  static inline void ata_id_to_hd_driveid(u16 *id)
  {
  #ifdef __BIG_ENDIAN
  	/* accessed in struct hd_driveid as 8-bit values */
  	id[ATA_ID_MAX_MULTSECT]	 = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
  	id[ATA_ID_CAPABILITY]	 = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
  	id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
  	id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
  	id[ATA_ID_MULTSECT]	 = __cpu_to_le16(id[ATA_ID_MULTSECT]);
  
  	/* as 32-bit values */
  	*(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
  	*(u32 *)&id[ATA_ID_SPG]		 = ata_id_u32(id, ATA_ID_SPG);
  
  	/* as 64-bit value */
  	*(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
  		ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
  #endif
  }

  /*

   * Write LBA Range Entries to the buffer that will cover the extent from
   * sector to sector + count.  This is used for TRIM and for ADD LBA(S)
   * TO NV CACHE PINNED SET.

   */

  static inline unsigned ata_set_lba_range_entries(void *_buffer,
  		unsigned buf_size, u64 sector, unsigned long count)

  {
  	__le64 *buffer = _buffer;

  	unsigned i = 0, used_bytes;

  	while (i < buf_size / 8 ) { /* 6-byte LBA + 2-byte range per entry */

  		u64 entry = sector |
  			((u64)(count > 0xffff ? 0xffff : count) << 48);
  		buffer[i++] = __cpu_to_le64(entry);
  		if (count <= 0xffff)
  			break;
  		count -= 0xffff;
  		sector += 0xffff;
  	}

  	used_bytes = ALIGN(i * 8, 512);
  	memset(buffer + i, 0, used_bytes - i * 8);
  	return used_bytes;

  }

  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 int ata_ok(u8 status)
  {
  	return ((status & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | ATA_ERR))
  			== ATA_DRDY);
  }

  static inline int lba_28_ok(u64 block, u32 n_block)
  {

  	/* check the ending block number: must be LESS THAN 0x0fffffff */
  	return ((block + n_block) < ((1 << 28) - 1)) && (n_block <= 256);

  }
  
  static inline int lba_48_ok(u64 block, u32 n_block)
  {
  	/* check the ending block number */
  	return ((block + n_block - 1) < ((u64)1 << 48)) && (n_block <= 65536);
  }

  #define sata_pmp_gscr_vendor(gscr)	((gscr)[SATA_PMP_GSCR_PROD_ID] & 0xffff)
  #define sata_pmp_gscr_devid(gscr)	((gscr)[SATA_PMP_GSCR_PROD_ID] >> 16)
  #define sata_pmp_gscr_rev(gscr)		(((gscr)[SATA_PMP_GSCR_REV] >> 8) & 0xff)
  #define sata_pmp_gscr_ports(gscr)	((gscr)[SATA_PMP_GSCR_PORT_INFO] & 0xf)

  #endif /* __LINUX_ATA_H__ */