include/linux/ata.h - kernel/msm-4.9 - Gitiles


 /*
  *  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/types.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_ID_WORDS		= 256,
 	ATA_ID_SERNO_OFS	= 10,
 	ATA_ID_FW_REV_OFS	= 23,
 	ATA_ID_PROD_OFS		= 27,
 	ATA_ID_OLD_PIO_MODES	= 51,
 	ATA_ID_FIELD_VALID	= 53,
 	ATA_ID_MWDMA_MODES	= 63,
 	ATA_ID_PIO_MODES	= 64,
 	ATA_ID_EIDE_DMA_MIN	= 65,
 	ATA_ID_EIDE_PIO		= 67,
 	ATA_ID_EIDE_PIO_IORDY	= 68,
 	ATA_ID_UDMA_MODES	= 88,
 	ATA_ID_MAJOR_VER	= 80,
 	ATA_ID_PIO4		= (1 << 1),

 	ATA_PCI_CTL_OFS		= 2,
 	ATA_SERNO_LEN		= 20,
 	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_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_DRQ			= (1 << 3),	/* data request i/o */
 	ATA_ERR			= (1 << 0),	/* have an error */
 	ATA_SRST		= (1 << 2),	/* software reset */
 	ATA_ABORTED		= (1 << 2),	/* command aborted */

 	/* 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_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_FLUSH		= 0xE7,
 	ATA_CMD_FLUSH_EXT	= 0xEA,
 	ATA_CMD_ID_ATA		= 0xEC,
 	ATA_CMD_ID_ATAPI	= 0xA1,
 	ATA_CMD_READ		= 0xC8,
 	ATA_CMD_READ_EXT	= 0x25,
 	ATA_CMD_WRITE		= 0xCA,
 	ATA_CMD_WRITE_EXT	= 0x35,
 	ATA_CMD_WRITE_FUA_EXT	= 0x3D,
 	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_PACKET		= 0xA0,
 	ATA_CMD_VERIFY		= 0x40,
 	ATA_CMD_VERIFY_EXT	= 0x42,
  	ATA_CMD_STANDBYNOW1	= 0xE0,
  	ATA_CMD_IDLEIMMEDIATE	= 0xE1,
 	ATA_CMD_INIT_DEV_PARAMS	= 0x91,

 	/* 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_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_4		= 0x0C,
 	XFER_PIO_3		= 0x0B,
 	XFER_PIO_2		= 0x0A,
 	XFER_PIO_1		= 0x09,
 	XFER_PIO_0		= 0x08,
 	XFER_PIO_SLOW		= 0x00,

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

 	/* cable types */
 	ATA_CBL_NONE		= 0,
 	ATA_CBL_PATA40		= 1,
 	ATA_CBL_PATA80		= 2,
 	ATA_CBL_PATA_UNK	= 3,
 	ATA_CBL_SATA		= 4,

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

 	/* 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 */
 };

 enum ata_tf_protocols {
 	/* ATA taskfile protocols */
 	ATA_PROT_UNKNOWN,	/* unknown/invalid */
 	ATA_PROT_NODATA,	/* no data */
 	ATA_PROT_PIO,		/* PIO single sector */
 	ATA_PROT_PIO_MULT,	/* PIO multiple sector */
 	ATA_PROT_DMA,		/* DMA */
 	ATA_PROT_ATAPI,		/* packet command, PIO data xfer*/
 	ATA_PROT_ATAPI_NODATA,	/* packet command, no data */
 	ATA_PROT_ATAPI_DMA,	/* packet command with special DMA sauce */
 };

 enum ata_ioctls {
 	ATA_IOC_GET_IO32	= 0x309,
 	ATA_IOC_SET_IO32	= 0x324,
 };

 /* core structures */

 struct ata_prd {
 	u32			addr;
 	u32			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 */
 };

 #define ata_id_is_ata(id)	(((id)[0] & (1 << 15)) == 0)
 #define ata_id_is_sata(id)	((id)[93] == 0)
 #define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))
 #define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))
 #define ata_id_has_fua(id)	((id)[84] & (1 << 6))
 #define ata_id_has_flush(id)	((id)[83] & (1 << 12))
 #define ata_id_has_flush_ext(id) ((id)[83] & (1 << 13))
 #define ata_id_has_lba48(id)	((id)[83] & (1 << 10))
 #define ata_id_has_wcache(id)	((id)[82] & (1 << 5))
 #define ata_id_has_pm(id)	((id)[82] & (1 << 3))
 #define ata_id_has_lba(id)	((id)[49] & (1 << 9))
 #define ata_id_has_dma(id)	((id)[49] & (1 << 8))
 #define ata_id_removeable(id)	((id)[0] & (1 << 7))
 #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]) )

 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[54] to id[56] are vendor specific. */
 	return (id[53] & 0x01) && /* Current translation valid */
 		id[54] &&  /* cylinders in current translation */
 		id[55] &&  /* heads in current translation */
 		id[55] <= 16 &&
 		id[56];    /* sectors in current translation */
 }

 static inline int atapi_cdb_len(const u16 *dev_id)
 {
 	u16 tmp = dev_id[0] & 0x3;
 	switch (tmp) {
 	case 0:		return 12;
 	case 1:		return 16;
 	default:	return -1;
 	}
 }

 static inline int is_atapi_taskfile(const struct ata_taskfile *tf)
 {
 	return (tf->protocol == ATA_PROT_ATAPI) ||
 	       (tf->protocol == ATA_PROT_ATAPI_NODATA) ||
 	       (tf->protocol == ATA_PROT_ATAPI_DMA);
 }

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

 #endif /* __LINUX_ATA_H__ */

	/*
	* 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/types.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_ID_WORDS = 256,
	ATA_ID_SERNO_OFS = 10,
	ATA_ID_FW_REV_OFS = 23,
	ATA_ID_PROD_OFS = 27,
	ATA_ID_OLD_PIO_MODES = 51,
	ATA_ID_FIELD_VALID = 53,
	ATA_ID_MWDMA_MODES = 63,
	ATA_ID_PIO_MODES = 64,
	ATA_ID_EIDE_DMA_MIN = 65,
	ATA_ID_EIDE_PIO = 67,
	ATA_ID_EIDE_PIO_IORDY = 68,
	ATA_ID_UDMA_MODES = 88,
	ATA_ID_MAJOR_VER = 80,
	ATA_ID_PIO4 = (1 << 1),

	ATA_PCI_CTL_OFS = 2,
	ATA_SERNO_LEN = 20,
	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_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_DRQ = (1 << 3), /* data request i/o */
	ATA_ERR = (1 << 0), /* have an error */
	ATA_SRST = (1 << 2), /* software reset */
	ATA_ABORTED = (1 << 2), /* command aborted */

	/* 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_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_FLUSH = 0xE7,
	ATA_CMD_FLUSH_EXT = 0xEA,
	ATA_CMD_ID_ATA = 0xEC,
	ATA_CMD_ID_ATAPI = 0xA1,
	ATA_CMD_READ = 0xC8,
	ATA_CMD_READ_EXT = 0x25,
	ATA_CMD_WRITE = 0xCA,
	ATA_CMD_WRITE_EXT = 0x35,
	ATA_CMD_WRITE_FUA_EXT = 0x3D,
	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_PACKET = 0xA0,
	ATA_CMD_VERIFY = 0x40,
	ATA_CMD_VERIFY_EXT = 0x42,
	ATA_CMD_STANDBYNOW1 = 0xE0,
	ATA_CMD_IDLEIMMEDIATE = 0xE1,
	ATA_CMD_INIT_DEV_PARAMS = 0x91,

	/* 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_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_4 = 0x0C,
	XFER_PIO_3 = 0x0B,
	XFER_PIO_2 = 0x0A,
	XFER_PIO_1 = 0x09,
	XFER_PIO_0 = 0x08,
	XFER_PIO_SLOW = 0x00,

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

	/* cable types */
	ATA_CBL_NONE = 0,
	ATA_CBL_PATA40 = 1,
	ATA_CBL_PATA80 = 2,
	ATA_CBL_PATA_UNK = 3,
	ATA_CBL_SATA = 4,

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

	/* 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 */
	};

	enum ata_tf_protocols {
	/* ATA taskfile protocols */
	ATA_PROT_UNKNOWN, /* unknown/invalid */
	ATA_PROT_NODATA, /* no data */
	ATA_PROT_PIO, /* PIO single sector */
	ATA_PROT_PIO_MULT, /* PIO multiple sector */
	ATA_PROT_DMA, /* DMA */
	ATA_PROT_ATAPI, /* packet command, PIO data xfer*/
	ATA_PROT_ATAPI_NODATA, /* packet command, no data */
	ATA_PROT_ATAPI_DMA, /* packet command with special DMA sauce */
	};

	enum ata_ioctls {
	ATA_IOC_GET_IO32 = 0x309,
	ATA_IOC_SET_IO32 = 0x324,
	};

	/* core structures */

	struct ata_prd {
	u32 addr;
	u32 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 */
	};

	#define ata_id_is_ata(id) (((id)[0] & (1 << 15)) == 0)
	#define ata_id_is_sata(id) ((id)[93] == 0)
	#define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))
	#define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))
	#define ata_id_has_fua(id) ((id)[84] & (1 << 6))
	#define ata_id_has_flush(id) ((id)[83] & (1 << 12))
	#define ata_id_has_flush_ext(id) ((id)[83] & (1 << 13))
	#define ata_id_has_lba48(id) ((id)[83] & (1 << 10))
	#define ata_id_has_wcache(id) ((id)[82] & (1 << 5))
	#define ata_id_has_pm(id) ((id)[82] & (1 << 3))
	#define ata_id_has_lba(id) ((id)[49] & (1 << 9))
	#define ata_id_has_dma(id) ((id)[49] & (1 << 8))
	#define ata_id_removeable(id) ((id)[0] & (1 << 7))
	#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]) )

	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[54] to id[56] are vendor specific. */
	return (id[53] & 0x01) && /* Current translation valid */
	id[54] && /* cylinders in current translation */
	id[55] && /* heads in current translation */
	id[55] <= 16 &&
	id[56]; /* sectors in current translation */
	}

	static inline int atapi_cdb_len(const u16 *dev_id)
	{
	u16 tmp = dev_id[0] & 0x3;
	switch (tmp) {
	case 0: return 12;
	case 1: return 16;
	default: return -1;
	}
	}

	static inline int is_atapi_taskfile(const struct ata_taskfile *tf)
	{
	return (tf->protocol == ATA_PROT_ATAPI) \|\|
	(tf->protocol == ATA_PROT_ATAPI_NODATA) \|\|
	(tf->protocol == ATA_PROT_ATAPI_DMA);
	}

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

	#endif /* __LINUX_ATA_H__ */