Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1516 insertions, 0 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
new file mode 100644
index 00000000000..9cfc0999bec
--- /dev/null
+++ b/include/linux/ide.h
@@ -0,0 +1,1516 @@
+#ifndef _IDE_H
+#define _IDE_H
+/*
+ *  linux/include/linux/ide.h
+ *
+ *  Copyright (C) 1994-2002  Linus Torvalds & authors
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/hdreg.h>
+#include <linux/hdsmart.h>
+#include <linux/blkdev.h>
+#include <linux/proc_fs.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/bio.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <asm/byteorder.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/semaphore.h>
+
+/*
+ * This is the multiple IDE interface driver, as evolved from hd.c.
+ * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * Primary i/f:    ide0: major=3;  (hda)         minor=0; (hdb)         minor=64
+ * Secondary i/f:  ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
+ * Tertiary i/f:   ide2: major=33; (hde)         minor=0; (hdf)         minor=64
+ * Quaternary i/f: ide3: major=34; (hdg)         minor=0; (hdh)         minor=64
+ */
+
+/******************************************************************************
+ * IDE driver configuration options (play with these as desired):
+ *
+ * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
+ */
+#define INITIAL_MULT_COUNT	0	/* off=0; on=2,4,8,16,32, etc.. */
+
+#ifndef SUPPORT_SLOW_DATA_PORTS		/* 1 to support slow data ports */
+#define SUPPORT_SLOW_DATA_PORTS	1	/* 0 to reduce kernel size */
+#endif
+#ifndef SUPPORT_VLB_SYNC		/* 1 to support weird 32-bit chips */
+#define SUPPORT_VLB_SYNC	1	/* 0 to reduce kernel size */
+#endif
+#ifndef OK_TO_RESET_CONTROLLER		/* 1 needed for good error recovery */
+#define OK_TO_RESET_CONTROLLER	1	/* 0 for use with AH2372A/B interface */
+#endif
+
+#ifndef DISABLE_IRQ_NOSYNC
+#define DISABLE_IRQ_NOSYNC	0
+#endif
+
+/*
+ * Used to indicate "no IRQ", should be a value that cannot be an IRQ
+ * number.
+ */
+ 
+#define IDE_NO_IRQ		(-1)
+
+/*
+ *  "No user-serviceable parts" beyond this point  :)
+ *****************************************************************************/
+
+typedef unsigned char	byte;	/* used everywhere */
+
+/*
+ * Probably not wise to fiddle with these
+ */
+#define ERROR_MAX	8	/* Max read/write errors per sector */
+#define ERROR_RESET	3	/* Reset controller every 4th retry */
+#define ERROR_RECAL	1	/* Recalibrate every 2nd retry */
+
+/*
+ * Tune flags
+ */
+#define IDE_TUNE_NOAUTO		2
+#define IDE_TUNE_AUTO		1
+#define IDE_TUNE_DEFAULT	0
+
+/*
+ * state flags
+ */
+
+#define DMA_PIO_RETRY	1	/* retrying in PIO */
+
+#define HWIF(drive)		((ide_hwif_t *)((drive)->hwif))
+#define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
+
+/*
+ * Definitions for accessing IDE controller registers
+ */
+#define IDE_NR_PORTS		(10)
+
+#define IDE_DATA_OFFSET		(0)
+#define IDE_ERROR_OFFSET	(1)
+#define IDE_NSECTOR_OFFSET	(2)
+#define IDE_SECTOR_OFFSET	(3)
+#define IDE_LCYL_OFFSET		(4)
+#define IDE_HCYL_OFFSET		(5)
+#define IDE_SELECT_OFFSET	(6)
+#define IDE_STATUS_OFFSET	(7)
+#define IDE_CONTROL_OFFSET	(8)
+#define IDE_IRQ_OFFSET		(9)
+
+#define IDE_FEATURE_OFFSET	IDE_ERROR_OFFSET
+#define IDE_COMMAND_OFFSET	IDE_STATUS_OFFSET
+
+#define IDE_CONTROL_OFFSET_HOB	(7)
+
+#define IDE_DATA_REG		(HWIF(drive)->io_ports[IDE_DATA_OFFSET])
+#define IDE_ERROR_REG		(HWIF(drive)->io_ports[IDE_ERROR_OFFSET])
+#define IDE_NSECTOR_REG		(HWIF(drive)->io_ports[IDE_NSECTOR_OFFSET])
+#define IDE_SECTOR_REG		(HWIF(drive)->io_ports[IDE_SECTOR_OFFSET])
+#define IDE_LCYL_REG		(HWIF(drive)->io_ports[IDE_LCYL_OFFSET])
+#define IDE_HCYL_REG		(HWIF(drive)->io_ports[IDE_HCYL_OFFSET])
+#define IDE_SELECT_REG		(HWIF(drive)->io_ports[IDE_SELECT_OFFSET])
+#define IDE_STATUS_REG		(HWIF(drive)->io_ports[IDE_STATUS_OFFSET])
+#define IDE_CONTROL_REG		(HWIF(drive)->io_ports[IDE_CONTROL_OFFSET])
+#define IDE_IRQ_REG		(HWIF(drive)->io_ports[IDE_IRQ_OFFSET])
+
+#define IDE_FEATURE_REG		IDE_ERROR_REG
+#define IDE_COMMAND_REG		IDE_STATUS_REG
+#define IDE_ALTSTATUS_REG	IDE_CONTROL_REG
+#define IDE_IREASON_REG		IDE_NSECTOR_REG
+#define IDE_BCOUNTL_REG		IDE_LCYL_REG
+#define IDE_BCOUNTH_REG		IDE_HCYL_REG
+
+#define OK_STAT(stat,good,bad)	(((stat)&((good)|(bad)))==(good))
+#define BAD_R_STAT		(BUSY_STAT   | ERR_STAT)
+#define BAD_W_STAT		(BAD_R_STAT  | WRERR_STAT)
+#define BAD_STAT		(BAD_R_STAT  | DRQ_STAT)
+#define DRIVE_READY		(READY_STAT  | SEEK_STAT)
+#define DATA_READY		(DRQ_STAT)
+
+#define BAD_CRC			(ABRT_ERR    | ICRC_ERR)
+
+#define SATA_NR_PORTS		(3)	/* 16 possible ?? */
+
+#define SATA_STATUS_OFFSET	(0)
+#define SATA_STATUS_REG		(HWIF(drive)->sata_scr[SATA_STATUS_OFFSET])
+#define SATA_ERROR_OFFSET	(1)
+#define SATA_ERROR_REG		(HWIF(drive)->sata_scr[SATA_ERROR_OFFSET])
+#define SATA_CONTROL_OFFSET	(2)
+#define SATA_CONTROL_REG	(HWIF(drive)->sata_scr[SATA_CONTROL_OFFSET])
+
+#define SATA_MISC_OFFSET	(0)
+#define SATA_MISC_REG		(HWIF(drive)->sata_misc[SATA_MISC_OFFSET])
+#define SATA_PHY_OFFSET		(1)
+#define SATA_PHY_REG		(HWIF(drive)->sata_misc[SATA_PHY_OFFSET])
+#define SATA_IEN_OFFSET		(2)
+#define SATA_IEN_REG		(HWIF(drive)->sata_misc[SATA_IEN_OFFSET])
+
+/*
+ * Our Physical Region Descriptor (PRD) table should be large enough
+ * to handle the biggest I/O request we are likely to see.  Since requests
+ * can have no more than 256 sectors, and since the typical blocksize is
+ * two or more sectors, we could get by with a limit of 128 entries here for
+ * the usual worst case.  Most requests seem to include some contiguous blocks,
+ * further reducing the number of table entries required.
+ *
+ * The driver reverts to PIO mode for individual requests that exceed
+ * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
+ * 100% of all crazy scenarios here is not necessary.
+ *
+ * As it turns out though, we must allocate a full 4KB page for this,
+ * so the two PRD tables (ide0 & ide1) will each get half of that,
+ * allowing each to have about 256 entries (8 bytes each) from this.
+ */
+#define PRD_BYTES       8
+#define PRD_ENTRIES	256
+
+/*
+ * Some more useful definitions
+ */
+#define PARTN_BITS	6	/* number of minor dev bits for partitions */
+#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
+#define SECTOR_SIZE	512
+#define SECTOR_WORDS	(SECTOR_SIZE / 4)	/* number of 32bit words per sector */
+#define IDE_LARGE_SEEK(b1,b2,t)	(((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))
+
+/*
+ * Timeouts for various operations:
+ */
+#define WAIT_DRQ	(HZ/10)		/* 100msec - spec allows up to 20ms */
+#define WAIT_READY	(5*HZ)		/* 5sec - some laptops are very slow */
+#define WAIT_PIDENTIFY	(10*HZ)	/* 10sec  - should be less than 3ms (?), if all ATAPI CD is closed at boot */
+#define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
+#define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
+#define WAIT_MIN_SLEEP	(2*HZ/100)	/* 20msec - minimum sleep time */
+
+#define HOST(hwif,chipset)					\
+{								\
+	return ((hwif)->chipset == chipset) ? 1 : 0;		\
+}
+
+/*
+ * Check for an interrupt and acknowledge the interrupt status
+ */
+struct hwif_s;
+typedef int (ide_ack_intr_t)(struct hwif_s *);
+
+#ifndef NO_DMA
+#define NO_DMA  255
+#endif
+
+/*
+ * hwif_chipset_t is used to keep track of the specific hardware
+ * chipset used by each IDE interface, if known.
+ */
+typedef enum {	ide_unknown,	ide_generic,	ide_pci,
+		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
+		ide_qd65xx,	ide_umc8672,	ide_ht6560b,
+		ide_rz1000,	ide_trm290,
+		ide_cmd646,	ide_cy82c693,	ide_4drives,
+		ide_pmac,	ide_etrax100,	ide_acorn,
+		ide_forced
+} hwif_chipset_t;
+
+/*
+ * Structure to hold all information about the location of this port
+ */
+typedef struct hw_regs_s {
+	unsigned long	io_ports[IDE_NR_PORTS];	/* task file registers */
+	int		irq;			/* our irq number */
+	int		dma;			/* our dma entry */
+	ide_ack_intr_t	*ack_intr;		/* acknowledge interrupt */
+	hwif_chipset_t  chipset;
+} hw_regs_t;
+
+/*
+ * Register new hardware with ide
+ */
+int ide_register_hw(hw_regs_t *hw, struct hwif_s **hwifp);
+int ide_register_hw_with_fixup(hw_regs_t *, struct hwif_s **, void (*)(struct hwif_s *));
+
+/*
+ * Set up hw_regs_t structure before calling ide_register_hw (optional)
+ */
+void ide_setup_ports(	hw_regs_t *hw,
+			unsigned long base,
+			int *offsets,
+			unsigned long ctrl,
+			unsigned long intr,
+			ide_ack_intr_t *ack_intr,
+#if 0
+			ide_io_ops_t *iops,
+#endif
+			int irq);
+
+static inline void ide_std_init_ports(hw_regs_t *hw,
+				      unsigned long io_addr,
+				      unsigned long ctl_addr)
+{
+	unsigned int i;
+
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
+		hw->io_ports[i] = io_addr++;
+
+	hw->io_ports[IDE_CONTROL_OFFSET] = ctl_addr;
+}
+
+#include <asm/ide.h>
+
+/* needed on alpha, x86/x86_64, ia64, mips, ppc32 and sh */
+#ifndef IDE_ARCH_OBSOLETE_DEFAULTS
+# define ide_default_io_base(index)	(0)
+# define ide_default_irq(base)		(0)
+# define ide_init_default_irq(base)	(0)
+#endif
+
+/*
+ * ide_init_hwif_ports() is OBSOLETE and will be removed in 2.7 series.
+ * New ports shouldn't define IDE_ARCH_OBSOLETE_INIT in <asm/ide.h>.
+ */
+#ifdef IDE_ARCH_OBSOLETE_INIT
+static inline void ide_init_hwif_ports(hw_regs_t *hw,
+				       unsigned long io_addr,
+				       unsigned long ctl_addr,
+				       int *irq)
+{
+	if (!ctl_addr)
+		ide_std_init_ports(hw, io_addr, ide_default_io_ctl(io_addr));
+	else
+		ide_std_init_ports(hw, io_addr, ctl_addr);
+
+	if (irq)
+		*irq = 0;
+
+	hw->io_ports[IDE_IRQ_OFFSET] = 0;
+
+#ifdef CONFIG_PPC32
+	if (ppc_ide_md.ide_init_hwif)
+		ppc_ide_md.ide_init_hwif(hw, io_addr, ctl_addr, irq);
+#endif
+}
+#else
+static inline void ide_init_hwif_ports(hw_regs_t *hw,
+				       unsigned long io_addr,
+				       unsigned long ctl_addr,
+				       int *irq)
+{
+	if (io_addr || ctl_addr)
+		printk(KERN_WARNING "%s: must not be called\n", __FUNCTION__);
+}
+#endif /* IDE_ARCH_OBSOLETE_INIT */
+
+/* Currently only m68k, apus and m8xx need it */
+#ifndef IDE_ARCH_ACK_INTR
+# define ide_ack_intr(hwif) (1)
+#endif
+
+/* Currently only Atari needs it */
+#ifndef IDE_ARCH_LOCK
+# define ide_release_lock()			do {} while (0)
+# define ide_get_lock(hdlr, data)		do {} while (0)
+#endif /* IDE_ARCH_LOCK */
+
+/*
+ * Now for the data we need to maintain per-drive:  ide_drive_t
+ */
+
+#define ide_scsi	0x21
+#define ide_disk	0x20
+#define ide_optical	0x7
+#define ide_cdrom	0x5
+#define ide_tape	0x1
+#define ide_floppy	0x0
+
+/*
+ * Special Driver Flags
+ *
+ * set_geometry	: respecify drive geometry
+ * recalibrate	: seek to cyl 0
+ * set_multmode	: set multmode count
+ * set_tune	: tune interface for drive
+ * serviced	: service command
+ * reserved	: unused
+ */
+typedef union {
+	unsigned all			: 8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned set_geometry	: 1;
+		unsigned recalibrate	: 1;
+		unsigned set_multmode	: 1;
+		unsigned set_tune	: 1;
+		unsigned serviced	: 1;
+		unsigned reserved	: 3;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned reserved	: 3;
+		unsigned serviced	: 1;
+		unsigned set_tune	: 1;
+		unsigned set_multmode	: 1;
+		unsigned recalibrate	: 1;
+		unsigned set_geometry	: 1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} special_t;
+
+/*
+ * ATA DATA Register Special.
+ * ATA NSECTOR Count Register().
+ * ATAPI Byte Count Register.
+ * Channel index ordering pairs.
+ */
+typedef union {
+	unsigned all			:16;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned low		:8;	/* LSB */
+		unsigned high		:8;	/* MSB */
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned high		:8;	/* MSB */
+		unsigned low		:8;	/* LSB */
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} ata_nsector_t, ata_data_t, atapi_bcount_t, ata_index_t;
+
+/*
+ * ATA-IDE Error Register
+ *
+ * mark		: Bad address mark
+ * tzero	: Couldn't find track 0
+ * abrt		: Aborted Command
+ * mcr		: Media Change Request
+ * id		: ID field not found
+ * mce		: Media Change Event
+ * ecc		: Uncorrectable ECC error
+ * bdd		: dual meaing
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned mark		:1;
+		unsigned tzero		:1;
+		unsigned abrt		:1;
+		unsigned mcr		:1;
+		unsigned id		:1;
+		unsigned mce		:1;
+		unsigned ecc		:1;
+		unsigned bdd		:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned bdd		:1;
+		unsigned ecc		:1;
+		unsigned mce		:1;
+		unsigned id		:1;
+		unsigned mcr		:1;
+		unsigned abrt		:1;
+		unsigned tzero		:1;
+		unsigned mark		:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} ata_error_t;
+
+/*
+ * ATA-IDE Select Register, aka Device-Head
+ *
+ * head		: always zeros here
+ * unit		: drive select number: 0/1
+ * bit5		: always 1
+ * lba		: using LBA instead of CHS
+ * bit7		: always 1
+ */
+typedef union {
+	unsigned all			: 8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned head		: 4;
+		unsigned unit		: 1;
+		unsigned bit5		: 1;
+		unsigned lba		: 1;
+		unsigned bit7		: 1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned bit7		: 1;
+		unsigned lba		: 1;
+		unsigned bit5		: 1;
+		unsigned unit		: 1;
+		unsigned head		: 4;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} select_t, ata_select_t;
+
+/*
+ * The ATA-IDE Status Register.
+ * The ATAPI Status Register.
+ *
+ * check	: Error occurred
+ * idx		: Index Error
+ * corr		: Correctable error occurred
+ * drq		: Data is request by the device
+ * dsc		: Disk Seek Complete			: ata
+ *		: Media access command finished		: atapi
+ * df		: Device Fault				: ata
+ *		: Reserved				: atapi
+ * drdy		: Ready, Command Mode Capable		: ata
+ *		: Ignored for ATAPI commands		: atapi
+ * bsy		: Disk is Busy
+ *		: The device has access to the command block
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned check		:1;
+		unsigned idx		:1;
+		unsigned corr		:1;
+		unsigned drq		:1;
+		unsigned dsc		:1;
+		unsigned df		:1;
+		unsigned drdy		:1;
+		unsigned bsy		:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned bsy		:1;
+		unsigned drdy		:1;
+		unsigned df		:1;
+		unsigned dsc		:1;
+		unsigned drq		:1;
+		unsigned corr           :1;
+		unsigned idx		:1;
+		unsigned check		:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} ata_status_t, atapi_status_t;
+
+/*
+ * ATA-IDE Control Register
+ *
+ * bit0		: Should be set to zero
+ * nIEN		: device INTRQ to host
+ * SRST		: host soft reset bit
+ * bit3		: ATA-2 thingy, Should be set to 1
+ * reserved456	: Reserved
+ * HOB		: 48-bit address ordering, High Ordered Bit
+ */
+typedef union {
+	unsigned all			: 8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned bit0		: 1;
+		unsigned nIEN		: 1;
+		unsigned SRST		: 1;
+		unsigned bit3		: 1;
+		unsigned reserved456	: 3;
+		unsigned HOB		: 1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned HOB		: 1;
+		unsigned reserved456	: 3;
+		unsigned bit3		: 1;
+		unsigned SRST		: 1;
+		unsigned nIEN		: 1;
+		unsigned bit0		: 1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} ata_control_t;
+
+/*
+ * ATAPI Feature Register
+ *
+ * dma		: Using DMA or PIO
+ * reserved321	: Reserved
+ * reserved654	: Reserved (Tag Type)
+ * reserved7	: Reserved
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned dma		:1;
+		unsigned reserved321	:3;
+		unsigned reserved654	:3;
+		unsigned reserved7	:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned reserved7	:1;
+		unsigned reserved654	:3;
+		unsigned reserved321	:3;
+		unsigned dma		:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} atapi_feature_t;
+
+/*
+ * ATAPI Interrupt Reason Register.
+ *
+ * cod		: Information transferred is command (1) or data (0)
+ * io		: The device requests us to read (1) or write (0)
+ * reserved	: Reserved
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned cod		:1;
+		unsigned io		:1;
+		unsigned reserved	:6;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned reserved	:6;
+		unsigned io		:1;
+		unsigned cod		:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} atapi_ireason_t;
+
+/*
+ * The ATAPI error register.
+ *
+ * ili		: Illegal Length Indication
+ * eom		: End Of Media Detected
+ * abrt		: Aborted command - As defined by ATA
+ * mcr		: Media Change Requested - As defined by ATA
+ * sense_key	: Sense key of the last failed packet command
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned ili		:1;
+		unsigned eom		:1;
+		unsigned abrt		:1;
+		unsigned mcr		:1;
+		unsigned sense_key	:4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned sense_key	:4;
+		unsigned mcr		:1;
+		unsigned abrt		:1;
+		unsigned eom		:1;
+		unsigned ili		:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} atapi_error_t;
+
+/*
+ * ATAPI floppy Drive Select Register
+ *
+ * sam_lun	: Logical unit number
+ * reserved3	: Reserved
+ * drv		: The responding drive will be drive 0 (0) or drive 1 (1)
+ * one5		: Should be set to 1
+ * reserved6	: Reserved
+ * one7		: Should be set to 1
+ */
+typedef union {
+	unsigned all			:8;
+	struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+		unsigned sam_lun	:3;
+		unsigned reserved3	:1;
+		unsigned drv		:1;
+		unsigned one5		:1;
+		unsigned reserved6	:1;
+		unsigned one7		:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+		unsigned one7		:1;
+		unsigned reserved6	:1;
+		unsigned one5		:1;
+		unsigned drv		:1;
+		unsigned reserved3	:1;
+		unsigned sam_lun	:3;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	} b;
+} atapi_select_t;
+
+/*
+ * Status returned from various ide_ functions
+ */
+typedef enum {
+	ide_stopped,	/* no drive operation was started */
+	ide_started,	/* a drive operation was started, handler was set */
+} ide_startstop_t;
+
+struct ide_driver_s;
+struct ide_settings_s;
+
+typedef struct ide_drive_s {
+	char		name[4];	/* drive name, such as "hda" */
+        char            driver_req[10];	/* requests specific driver */
+
+	request_queue_t		*queue;	/* request queue */
+
+	struct request		*rq;	/* current request */
+	struct ide_drive_s 	*next;	/* circular list of hwgroup drives */
+	struct ide_driver_s	*driver;/* (ide_driver_t *) */
+	void		*driver_data;	/* extra driver data */
+	struct hd_driveid	*id;	/* drive model identification info */
+	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */
+	struct ide_settings_s *settings;/* /proc/ide/ drive settings */
+	char		devfs_name[64];	/* devfs crap */
+
+	struct hwif_s		*hwif;	/* actually (ide_hwif_t *) */
+
+	unsigned long sleep;		/* sleep until this time */
+	unsigned long service_start;	/* time we started last request */
+	unsigned long service_time;	/* service time of last request */
+	unsigned long timeout;		/* max time to wait for irq */
+
+	special_t	special;	/* special action flags */
+	select_t	select;		/* basic drive/head select reg value */
+
+	u8	keep_settings;		/* restore settings after drive reset */
+	u8	autodma;		/* device can safely use dma on host */
+	u8	using_dma;		/* disk is using dma for read/write */
+	u8	retry_pio;		/* retrying dma capable host in pio */
+	u8	state;			/* retry state */
+	u8	waiting_for_dma;	/* dma currently in progress */
+	u8	unmask;			/* okay to unmask other irqs */
+	u8	bswap;			/* byte swap data */
+	u8	dsc_overlap;		/* DSC overlap */
+	u8	nice1;			/* give potential excess bandwidth */
+
+	unsigned present	: 1;	/* drive is physically present */
+	unsigned dead		: 1;	/* device ejected hint */
+	unsigned id_read	: 1;	/* 1=id read from disk 0 = synthetic */
+	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
+	unsigned removable	: 1;	/* 1 if need to do check_media_change */
+	unsigned attach		: 1;	/* needed for removable devices */
+	unsigned is_flash	: 1;	/* 1 if probed as flash */
+	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
+	unsigned no_unmask	: 1;	/* disallow setting unmask bit */
+	unsigned no_io_32bit	: 1;	/* disallow enabling 32bit I/O */
+	unsigned atapi_overlap	: 1;	/* ATAPI overlap (not supported) */
+	unsigned nice0		: 1;	/* give obvious excess bandwidth */
+	unsigned nice2		: 1;	/* give a share in our own bandwidth */
+	unsigned doorlocking	: 1;	/* for removable only: door lock/unlock works */
+	unsigned autotune	: 2;	/* 0=default, 1=autotune, 2=noautotune */
+	unsigned remap_0_to_1	: 1;	/* 0=noremap, 1=remap 0->1 (for EZDrive) */
+	unsigned blocked        : 1;	/* 1=powermanagment told us not to do anything, so sleep nicely */
+	unsigned vdma		: 1;	/* 1=doing PIO over DMA 0=doing normal DMA */
+	unsigned addressing;		/*      : 3;
+					 *  0=28-bit
+					 *  1=48-bit
+					 *  2=48-bit doing 28-bit
+					 *  3=64-bit
+					 */
+	unsigned scsi		: 1;	/* 0=default, 1=ide-scsi emulation */
+	unsigned sleeping	: 1;	/* 1=sleeping & sleep field valid */
+	unsigned post_reset	: 1;
+
+        u8	quirk_list;	/* considered quirky, set for a specific host */
+        u8	init_speed;	/* transfer rate set at boot */
+        u8	pio_speed;      /* unused by core, used by some drivers for fallback from DMA */
+        u8	current_speed;	/* current transfer rate set */
+        u8	dn;		/* now wide spread use */
+        u8	wcache;		/* status of write cache */
+	u8	acoustic;	/* acoustic management */
+	u8	media;		/* disk, cdrom, tape, floppy, ... */
+	u8	ctl;		/* "normal" value for IDE_CONTROL_REG */
+	u8	ready_stat;	/* min status value for drive ready */
+	u8	mult_count;	/* current multiple sector setting */
+	u8	mult_req;	/* requested multiple sector setting */
+	u8	tune_req;	/* requested drive tuning setting */
+	u8	io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
+	u8	bad_wstat;	/* used for ignoring WRERR_STAT */
+	u8	nowerr;		/* used for ignoring WRERR_STAT */
+	u8	sect0;		/* offset of first sector for DM6:DDO */
+	u8	head;		/* "real" number of heads */
+	u8	sect;		/* "real" sectors per track */
+	u8	bios_head;	/* BIOS/fdisk/LILO number of heads */
+	u8	bios_sect;	/* BIOS/fdisk/LILO sectors per track */
+
+	unsigned int	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
+	unsigned int	cyl;		/* "real" number of cyls */
+	unsigned int	drive_data;	/* use by tuneproc/selectproc */
+	unsigned int	usage;		/* current "open()" count for drive */
+	unsigned int	failures;	/* current failure count */
+	unsigned int	max_failures;	/* maximum allowed failure count */
+
+	u64		capacity64;	/* total number of sectors */
+
+	int		lun;		/* logical unit */
+	int		crc_count;	/* crc counter to reduce drive speed */
+	struct list_head list;
+	struct device	gendev;
+	struct semaphore gendev_rel_sem;	/* to deal with device release() */
+} ide_drive_t;
+
+#define IDE_CHIPSET_PCI_MASK	\
+    ((1<<ide_pci)|(1<<ide_cmd646)|(1<<ide_ali14xx))
+#define IDE_CHIPSET_IS_PCI(c)	((IDE_CHIPSET_PCI_MASK >> (c)) & 1)
+
+struct ide_pci_device_s;
+
+typedef struct hwif_s {
+	struct hwif_s *next;		/* for linked-list in ide_hwgroup_t */
+	struct hwif_s *mate;		/* other hwif from same PCI chip */
+	struct hwgroup_s *hwgroup;	/* actually (ide_hwgroup_t *) */
+	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */
+
+	char name[6];			/* name of interface, eg. "ide0" */
+
+		/* task file registers for pata and sata */
+	unsigned long	io_ports[IDE_NR_PORTS];
+	unsigned long	sata_scr[SATA_NR_PORTS];
+	unsigned long	sata_misc[SATA_NR_PORTS];
+
+	hw_regs_t	hw;		/* Hardware info */
+	ide_drive_t	drives[MAX_DRIVES];	/* drive info */
+
+	u8 major;	/* our major number */
+	u8 index;	/* 0 for ide0; 1 for ide1; ... */
+	u8 channel;	/* for dual-port chips: 0=primary, 1=secondary */
+	u8 straight8;	/* Alan's straight 8 check */
+	u8 bus_state;	/* power state of the IDE bus */
+
+	u8 atapi_dma;	/* host supports atapi_dma */
+	u8 ultra_mask;
+	u8 mwdma_mask;
+	u8 swdma_mask;
+
+	hwif_chipset_t chipset;	/* sub-module for tuning.. */
+
+	struct pci_dev  *pci_dev;	/* for pci chipsets */
+	struct ide_pci_device_s	*cds;	/* chipset device struct */
+
+	void (*rw_disk)(ide_drive_t *, struct request *);
+
+#if 0
+	ide_hwif_ops_t	*hwifops;
+#else
+	/* routine to tune PIO mode for drives */
+	void	(*tuneproc)(ide_drive_t *, u8);
+	/* routine to retune DMA modes for drives */
+	int	(*speedproc)(ide_drive_t *, u8);
+	/* tweaks hardware to select drive */
+	void	(*selectproc)(ide_drive_t *);
+	/* chipset polling based on hba specifics */
+	int	(*reset_poll)(ide_drive_t *);
+	/* chipset specific changes to default for device-hba resets */
+	void	(*pre_reset)(ide_drive_t *);
+	/* routine to reset controller after a disk reset */
+	void	(*resetproc)(ide_drive_t *);
+	/* special interrupt handling for shared pci interrupts */
+	void	(*intrproc)(ide_drive_t *);
+	/* special host masking for drive selection */
+	void	(*maskproc)(ide_drive_t *, int);
+	/* check host's drive quirk list */
+	int	(*quirkproc)(ide_drive_t *);
+	/* driver soft-power interface */
+	int	(*busproc)(ide_drive_t *, int);
+//	/* host rate limiter */
+//	u8	(*ratemask)(ide_drive_t *);
+//	/* device rate limiter */
+//	u8	(*ratefilter)(ide_drive_t *, u8);
+#endif
+
+	void (*ata_input_data)(ide_drive_t *, void *, u32);
+	void (*ata_output_data)(ide_drive_t *, void *, u32);
+
+	void (*atapi_input_bytes)(ide_drive_t *, void *, u32);
+	void (*atapi_output_bytes)(ide_drive_t *, void *, u32);
+
+	int (*dma_setup)(ide_drive_t *);
+	void (*dma_exec_cmd)(ide_drive_t *, u8);
+	void (*dma_start)(ide_drive_t *);
+	int (*ide_dma_end)(ide_drive_t *drive);
+	int (*ide_dma_check)(ide_drive_t *drive);
+	int (*ide_dma_on)(ide_drive_t *drive);
+	int (*ide_dma_off_quietly)(ide_drive_t *drive);
+	int (*ide_dma_test_irq)(ide_drive_t *drive);
+	int (*ide_dma_host_on)(ide_drive_t *drive);
+	int (*ide_dma_host_off)(ide_drive_t *drive);
+	int (*ide_dma_lostirq)(ide_drive_t *drive);
+	int (*ide_dma_timeout)(ide_drive_t *drive);
+
+	void (*OUTB)(u8 addr, unsigned long port);
+	void (*OUTBSYNC)(ide_drive_t *drive, u8 addr, unsigned long port);
+	void (*OUTW)(u16 addr, unsigned long port);
+	void (*OUTL)(u32 addr, unsigned long port);
+	void (*OUTSW)(unsigned long port, void *addr, u32 count);
+	void (*OUTSL)(unsigned long port, void *addr, u32 count);
+
+	u8  (*INB)(unsigned long port);
+	u16 (*INW)(unsigned long port);
+	u32 (*INL)(unsigned long port);
+	void (*INSW)(unsigned long port, void *addr, u32 count);
+	void (*INSL)(unsigned long port, void *addr, u32 count);
+
+	/* dma physical region descriptor table (cpu view) */
+	unsigned int	*dmatable_cpu;
+	/* dma physical region descriptor table (dma view) */
+	dma_addr_t	dmatable_dma;
+	/* Scatter-gather list used to build the above */
+	struct scatterlist *sg_table;
+	int sg_max_nents;		/* Maximum number of entries in it */
+	int sg_nents;			/* Current number of entries in it */
+	int sg_dma_direction;		/* dma transfer direction */
+
+	/* data phase of the active command (currently only valid for PIO/DMA) */
+	int		data_phase;
+
+	unsigned int nsect;
+	unsigned int nleft;
+	unsigned int cursg;
+	unsigned int cursg_ofs;
+
+	int		mmio;		/* hosts iomio (0) or custom (2) select */
+	int		rqsize;		/* max sectors per request */
+	int		irq;		/* our irq number */
+
+	unsigned long	dma_master;	/* reference base addr dmabase */
+	unsigned long	dma_base;	/* base addr for dma ports */
+	unsigned long	dma_command;	/* dma command register */
+	unsigned long	dma_vendor1;	/* dma vendor 1 register */
+	unsigned long	dma_status;	/* dma status register */
+	unsigned long	dma_vendor3;	/* dma vendor 3 register */
+	unsigned long	dma_prdtable;	/* actual prd table address */
+	unsigned long	dma_base2;	/* extended base addr for dma ports */
+
+	unsigned	dma_extra;	/* extra addr for dma ports */
+	unsigned long	config_data;	/* for use by chipset-specific code */
+	unsigned long	select_data;	/* for use by chipset-specific code */
+
+	unsigned	noprobe    : 1;	/* don't probe for this interface */
+	unsigned	present    : 1;	/* this interface exists */
+	unsigned	hold       : 1; /* this interface is always present */
+	unsigned	serialized : 1;	/* serialized all channel operation */
+	unsigned	sharing_irq: 1;	/* 1 = sharing irq with another hwif */
+	unsigned	reset      : 1;	/* reset after probe */
+	unsigned	autodma    : 1;	/* auto-attempt using DMA at boot */
+	unsigned	udma_four  : 1;	/* 1=ATA-66 capable, 0=default */
+	unsigned	no_lba48   : 1; /* 1 = cannot do LBA48 */
+	unsigned	no_lba48_dma : 1; /* 1 = cannot do LBA48 DMA */
+	unsigned	no_dsc     : 1;	/* 0 default, 1 dsc_overlap disabled */
+	unsigned	auto_poll  : 1; /* supports nop auto-poll */
+	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */
+
+	struct device	gendev;
+	struct semaphore gendev_rel_sem; /* To deal with device release() */
+
+	void		*hwif_data;	/* extra hwif data */
+
+	unsigned dma;
+
+	void (*led_act)(void *data, int rw);
+} ide_hwif_t;
+
+/*
+ *  internal ide interrupt handler type
+ */
+typedef ide_startstop_t (ide_pre_handler_t)(ide_drive_t *, struct request *);
+typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
+typedef int (ide_expiry_t)(ide_drive_t *);
+
+typedef struct hwgroup_s {
+		/* irq handler, if active */
+	ide_startstop_t	(*handler)(ide_drive_t *);
+		/* irq handler, suspended if active */
+	ide_startstop_t	(*handler_save)(ide_drive_t *);
+		/* BOOL: protects all fields below */
+	volatile int busy;
+		/* BOOL: wake us up on timer expiry */
+	unsigned int sleeping	: 1;
+		/* BOOL: polling active & poll_timeout field valid */
+	unsigned int polling	: 1;
+		/* current drive */
+	ide_drive_t *drive;
+		/* ptr to current hwif in linked-list */
+	ide_hwif_t *hwif;
+
+		/* for pci chipsets */
+	struct pci_dev *pci_dev;
+		/* chipset device struct */
+	struct ide_pci_device_s *cds;
+
+		/* current request */
+	struct request *rq;
+		/* failsafe timer */
+	struct timer_list timer;
+		/* local copy of current write rq */
+	struct request wrq;
+		/* timeout value during long polls */
+	unsigned long poll_timeout;
+		/* queried upon timeouts */
+	int (*expiry)(ide_drive_t *);
+		/* ide_system_bus_speed */
+	int pio_clock;
+
+	unsigned char cmd_buf[4];
+} ide_hwgroup_t;
+
+/* structure attached to the request for IDE_TASK_CMDS */
+
+/*
+ * configurable drive settings
+ */
+
+#define TYPE_INT	0
+#define TYPE_INTA	1
+#define TYPE_BYTE	2
+#define TYPE_SHORT	3
+
+#define SETTING_READ	(1 << 0)
+#define SETTING_WRITE	(1 << 1)
+#define SETTING_RW	(SETTING_READ | SETTING_WRITE)
+
+typedef int (ide_procset_t)(ide_drive_t *, int);
+typedef struct ide_settings_s {
+	char			*name;
+	int			rw;
+	int			read_ioctl;
+	int			write_ioctl;
+	int			data_type;
+	int			min;
+	int			max;
+	int			mul_factor;
+	int			div_factor;
+	void			*data;
+	ide_procset_t		*set;
+	int			auto_remove;
+	struct ide_settings_s	*next;
+} ide_settings_t;
+
+extern struct semaphore ide_setting_sem;
+extern int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set);
+extern ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name);
+extern int ide_read_setting(ide_drive_t *t, ide_settings_t *setting);
+extern int ide_write_setting(ide_drive_t *drive, ide_settings_t *setting, int val);
+extern void ide_add_generic_settings(ide_drive_t *drive);
+
+/*
+ * /proc/ide interface
+ */
+typedef struct {
+	const char	*name;
+	mode_t		mode;
+	read_proc_t	*read_proc;
+	write_proc_t	*write_proc;
+} ide_proc_entry_t;
+
+#ifdef CONFIG_PROC_FS
+extern struct proc_dir_entry *proc_ide_root;
+
+extern void proc_ide_create(void);
+extern void proc_ide_destroy(void);
+extern void create_proc_ide_interfaces(void);
+void destroy_proc_ide_interface(ide_hwif_t *);
+extern void ide_add_proc_entries(struct proc_dir_entry *, ide_proc_entry_t *, void *);
+extern void ide_remove_proc_entries(struct proc_dir_entry *, ide_proc_entry_t *);
+read_proc_t proc_ide_read_capacity;
+read_proc_t proc_ide_read_geometry;
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+void ide_pci_create_host_proc(const char *, get_info_t *);
+#endif
+
+/*
+ * Standard exit stuff:
+ */
+#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) \
+{					\
+	len -= off;			\
+	if (len < count) {		\
+		*eof = 1;		\
+		if (len <= 0)		\
+			return 0;	\
+	} else				\
+		len = count;		\
+	*start = page + off;		\
+	return len;			\
+}
+#else
+static inline void create_proc_ide_interfaces(void) { ; }
+static inline void destroy_proc_ide_interface(ide_hwif_t *hwif) { ; }
+#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) return 0;
+#endif
+
+/*
+ * Power Management step value (rq->pm->pm_step).
+ *
+ * The step value starts at 0 (ide_pm_state_start_suspend) for a
+ * suspend operation or 1000 (ide_pm_state_start_resume) for a
+ * resume operation.
+ *
+ * For each step, the core calls the subdriver start_power_step() first.
+ * This can return:
+ *	- ide_stopped :	In this case, the core calls us back again unless
+ *			step have been set to ide_power_state_completed.
+ *	- ide_started :	In this case, the channel is left busy until an
+ *			async event (interrupt) occurs.
+ * Typically, start_power_step() will issue a taskfile request with
+ * do_rw_taskfile().
+ *
+ * Upon reception of the interrupt, the core will call complete_power_step()
+ * with the error code if any. This routine should update the step value
+ * and return. It should not start a new request. The core will call
+ * start_power_step for the new step value, unless step have been set to
+ * ide_power_state_completed.
+ *
+ * Subdrivers are expected to define their own additional power
+ * steps from 1..999 for suspend and from 1001..1999 for resume,
+ * other values are reserved for future use.
+ */
+
+enum {
+	ide_pm_state_completed		= -1,
+	ide_pm_state_start_suspend	= 0,
+	ide_pm_state_start_resume	= 1000,
+};
+
+/*
+ * Subdrivers support.
+ */
+typedef struct ide_driver_s {
+	struct module			*owner;
+	const char			*name;
+	const char			*version;
+	u8				media;
+	unsigned busy			: 1;
+	unsigned supports_dsc_overlap	: 1;
+	int		(*cleanup)(ide_drive_t *);
+	ide_startstop_t	(*do_request)(ide_drive_t *, struct request *, sector_t);
+	int		(*end_request)(ide_drive_t *, int, int);
+	ide_startstop_t	(*error)(ide_drive_t *, struct request *rq, u8, u8);
+	ide_startstop_t	(*abort)(ide_drive_t *, struct request *rq);
+	int		(*ioctl)(ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
+	ide_proc_entry_t	*proc;
+	int		(*attach)(ide_drive_t *);
+	void		(*ata_prebuilder)(ide_drive_t *);
+	void		(*atapi_prebuilder)(ide_drive_t *);
+	struct device_driver	gen_driver;
+	struct list_head drives;
+	struct list_head drivers;
+} ide_driver_t;
+
+#define DRIVER(drive)		((drive)->driver)
+
+int generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *, unsigned, unsigned long);
+
+/*
+ * ide_hwifs[] is the master data structure used to keep track
+ * of just about everything in ide.c.  Whenever possible, routines
+ * should be using pointers to a drive (ide_drive_t *) or
+ * pointers to a hwif (ide_hwif_t *), rather than indexing this
+ * structure directly (the allocation/layout may change!).
+ *
+ */
+#ifndef _IDE_C
+extern	ide_hwif_t	ide_hwifs[];		/* master data repository */
+#endif
+extern int noautodma;
+
+extern int ide_end_request (ide_drive_t *drive, int uptodate, int nrsecs);
+extern int __ide_end_request (ide_drive_t *drive, struct request *rq, int uptodate, int nrsecs);
+
+/*
+ * This is used on exit from the driver to designate the next irq handler
+ * and also to start the safety timer.
+ */
+extern void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry);
+
+/*
+ * This is used on exit from the driver to designate the next irq handler
+ * and start the safety time safely and atomically from the IRQ handler
+ * with respect to the command issue (which it also does)
+ */
+extern void ide_execute_command(ide_drive_t *, task_ioreg_t cmd, ide_handler_t *, unsigned int, ide_expiry_t *);
+
+ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);
+
+/*
+ * ide_error() takes action based on the error returned by the controller.
+ * The caller should return immediately after invoking this.
+ *
+ * (drive, msg, status)
+ */
+ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);
+
+ide_startstop_t __ide_abort(ide_drive_t *, struct request *);
+
+/*
+ * Abort a running command on the controller triggering the abort
+ * from a host side, non error situation
+ * (drive, msg)
+ */
+extern ide_startstop_t ide_abort(ide_drive_t *, const char *);
+
+extern void ide_fix_driveid(struct hd_driveid *);
+/*
+ * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
+ * removing leading/trailing blanks and compressing internal blanks.
+ * It is primarily used to tidy up the model name/number fields as
+ * returned by the WIN_[P]IDENTIFY commands.
+ *
+ * (s, bytecount, byteswap)
+ */
+extern void ide_fixstring(u8 *, const int, const int);
+
+/*
+ * This routine busy-waits for the drive status to be not "busy".
+ * It then checks the status for all of the "good" bits and none
+ * of the "bad" bits, and if all is okay it returns 0.  All other
+ * cases return 1 after doing "*startstop = ide_error()", and the
+ * caller should return the updated value of "startstop" in this case.
+ * "startstop" is unchanged when the function returns 0;
+ * (startstop, drive, good, bad, timeout)
+ */
+extern int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);
+
+/*
+ * Start a reset operation for an IDE interface.
+ * The caller should return immediately after invoking this.
+ */
+extern ide_startstop_t ide_do_reset (ide_drive_t *);
+
+/*
+ * This function is intended to be used prior to invoking ide_do_drive_cmd().
+ */
+extern void ide_init_drive_cmd (struct request *rq);
+
+/*
+ * this function returns error location sector offset in case of a write error
+ */
+extern u64 ide_get_error_location(ide_drive_t *, char *);
+
+/*
+ * "action" parameter type for ide_do_drive_cmd() below.
+ */
+typedef enum {
+	ide_wait,	/* insert rq at end of list, and wait for it */
+	ide_next,	/* insert rq immediately after current request */
+	ide_preempt,	/* insert rq in front of current request */
+	ide_head_wait,	/* insert rq in front of current request and wait for it */
+	ide_end		/* insert rq at end of list, but don't wait for it */
+} ide_action_t;
+
+/*
+ * This function issues a special IDE device request
+ * onto the request queue.
+ *
+ * If action is ide_wait, then the rq is queued at the end of the
+ * request queue, and the function sleeps until it has been processed.
+ * This is for use when invoked from an ioctl handler.
+ *
+ * If action is ide_preempt, then the rq is queued at the head of
+ * the request queue, displacing the currently-being-processed
+ * request and this function returns immediately without waiting
+ * for the new rq to be completed.  This is VERY DANGEROUS, and is
+ * intended for careful use by the ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_next, then the rq is queued immediately after
+ * the currently-being-processed-request (if any), and the function
+ * returns without waiting for the new rq to be completed.  As above,
+ * This is VERY DANGEROUS, and is intended for careful use by the
+ * ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_end, then the rq is queued at the end of the
+ * request queue, and the function returns immediately without waiting
+ * for the new rq to be completed. This is again intended for careful
+ * use by the ATAPI tape/cdrom driver code.
+ */
+extern int ide_do_drive_cmd(ide_drive_t *, struct request *, ide_action_t);
+
+/*
+ * Clean up after success/failure of an explicit drive cmd.
+ * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
+ * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_TASK_MASK).
+ *
+ * (ide_drive_t *drive, u8 stat, u8 err)
+ */
+extern void ide_end_drive_cmd(ide_drive_t *, u8, u8);
+
+/*
+ * Issue ATA command and wait for completion.
+ * Use for implementing commands in kernel
+ *
+ *  (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
+ */
+extern int ide_wait_cmd(ide_drive_t *, u8, u8, u8, u8, u8 *);
+
+typedef struct ide_task_s {
+/*
+ *	struct hd_drive_task_hdr	tf;
+ *	task_struct_t		tf;
+ *	struct hd_drive_hob_hdr		hobf;
+ *	hob_struct_t		hobf;
+ */
+	task_ioreg_t		tfRegister[8];
+	task_ioreg_t		hobRegister[8];
+	ide_reg_valid_t		tf_out_flags;
+	ide_reg_valid_t		tf_in_flags;
+	int			data_phase;
+	int			command_type;
+	ide_pre_handler_t	*prehandler;
+	ide_handler_t		*handler;
+	struct request		*rq;		/* copy of request */
+	void			*special;	/* valid_t generally */
+} ide_task_t;
+
+extern u32 ide_read_24(ide_drive_t *);
+
+extern void SELECT_DRIVE(ide_drive_t *);
+extern void SELECT_INTERRUPT(ide_drive_t *);
+extern void SELECT_MASK(ide_drive_t *, int);
+extern void QUIRK_LIST(ide_drive_t *);
+
+extern int drive_is_ready(ide_drive_t *);
+extern int wait_for_ready(ide_drive_t *, int /* timeout */);
+
+/*
+ * taskfile io for disks for now...and builds request from ide_ioctl
+ */
+extern ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
+
+/*
+ * Special Flagged Register Validation Caller
+ */
+extern ide_startstop_t flagged_taskfile(ide_drive_t *, ide_task_t *);
+
+extern ide_startstop_t set_multmode_intr(ide_drive_t *);
+extern ide_startstop_t set_geometry_intr(ide_drive_t *);
+extern ide_startstop_t recal_intr(ide_drive_t *);
+extern ide_startstop_t task_no_data_intr(ide_drive_t *);
+extern ide_startstop_t task_in_intr(ide_drive_t *);
+extern ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *);
+
+extern int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *);
+
+int ide_taskfile_ioctl(ide_drive_t *, unsigned int, unsigned long);
+int ide_cmd_ioctl(ide_drive_t *, unsigned int, unsigned long);
+int ide_task_ioctl(ide_drive_t *, unsigned int, unsigned long);
+
+extern int system_bus_clock(void);
+
+extern int ide_driveid_update(ide_drive_t *);
+extern int ide_ata66_check(ide_drive_t *, ide_task_t *);
+extern int ide_config_drive_speed(ide_drive_t *, u8);
+extern u8 eighty_ninty_three (ide_drive_t *);
+extern int set_transfer(ide_drive_t *, ide_task_t *);
+extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *);
+
+extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout);
+
+/*
+ * ide_stall_queue() can be used by a drive to give excess bandwidth back
+ * to the hwgroup by sleeping for timeout jiffies.
+ */
+extern void ide_stall_queue(ide_drive_t *drive, unsigned long timeout);
+
+extern int ide_spin_wait_hwgroup(ide_drive_t *);
+extern void ide_timer_expiry(unsigned long);
+extern irqreturn_t ide_intr(int irq, void *dev_id, struct pt_regs *regs);
+extern void do_ide_request(request_queue_t *);
+extern void ide_init_subdrivers(void);
+
+void ide_init_disk(struct gendisk *, ide_drive_t *);
+
+extern int ata_attach(ide_drive_t *);
+
+extern int ideprobe_init(void);
+
+extern void ide_scan_pcibus(int scan_direction) __init;
+extern int ide_pci_register_driver(struct pci_driver *driver);
+extern void ide_pci_unregister_driver(struct pci_driver *driver);
+void ide_pci_setup_ports(struct pci_dev *, struct ide_pci_device_s *, int, ata_index_t *);
+extern void ide_setup_pci_noise (struct pci_dev *dev, struct ide_pci_device_s *d);
+
+extern void default_hwif_iops(ide_hwif_t *);
+extern void default_hwif_mmiops(ide_hwif_t *);
+extern void default_hwif_transport(ide_hwif_t *);
+
+int ide_register_driver(ide_driver_t *driver);
+void ide_unregister_driver(ide_driver_t *driver);
+int ide_register_subdriver(ide_drive_t *, ide_driver_t *);
+int ide_unregister_subdriver (ide_drive_t *drive);
+int ide_replace_subdriver(ide_drive_t *drive, const char *driver);
+
+#define ON_BOARD		1
+#define NEVER_BOARD		0
+
+#ifdef CONFIG_BLK_DEV_OFFBOARD
+#  define OFF_BOARD		ON_BOARD
+#else /* CONFIG_BLK_DEV_OFFBOARD */
+#  define OFF_BOARD		NEVER_BOARD
+#endif /* CONFIG_BLK_DEV_OFFBOARD */
+
+#define NODMA 0
+#define NOAUTODMA 1
+#define AUTODMA 2
+
+typedef struct ide_pci_enablebit_s {
+	u8	reg;	/* byte pci reg holding the enable-bit */
+	u8	mask;	/* mask to isolate the enable-bit */
+	u8	val;	/* value of masked reg when "enabled" */
+} ide_pci_enablebit_t;
+
+enum {
+	/* Uses ISA control ports not PCI ones. */
+	IDEPCI_FLAG_ISA_PORTS		= (1 << 0),
+	IDEPCI_FLAG_FORCE_PDC		= (1 << 1),
+};
+
+typedef struct ide_pci_device_s {
+	char			*name;
+	int			(*init_setup)(struct pci_dev *, struct ide_pci_device_s *);
+	void			(*init_setup_dma)(struct pci_dev *, struct ide_pci_device_s *, ide_hwif_t *);
+	unsigned int		(*init_chipset)(struct pci_dev *, const char *);
+	void			(*init_iops)(ide_hwif_t *);
+	void                    (*init_hwif)(ide_hwif_t *);
+	void			(*init_dma)(ide_hwif_t *, unsigned long);
+	void			(*fixup)(ide_hwif_t *);
+	u8			channels;
+	u8			autodma;
+	ide_pci_enablebit_t	enablebits[2];
+	u8			bootable;
+	unsigned int		extra;
+	struct ide_pci_device_s	*next;
+	u8			flags;
+} ide_pci_device_t;
+
+extern int ide_setup_pci_device(struct pci_dev *, ide_pci_device_t *);
+extern int ide_setup_pci_devices(struct pci_dev *, struct pci_dev *, ide_pci_device_t *);
+
+void ide_map_sg(ide_drive_t *, struct request *);
+void ide_init_sg_cmd(ide_drive_t *, struct request *);
+
+#define BAD_DMA_DRIVE		0
+#define GOOD_DMA_DRIVE		1
+
+#ifdef CONFIG_BLK_DEV_IDEDMA
+int __ide_dma_bad_drive(ide_drive_t *);
+int __ide_dma_good_drive(ide_drive_t *);
+int ide_use_dma(ide_drive_t *);
+int __ide_dma_off(ide_drive_t *);
+void ide_dma_verbose(ide_drive_t *);
+ide_startstop_t ide_dma_intr(ide_drive_t *);
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
+extern int ide_build_sglist(ide_drive_t *, struct request *);
+extern int ide_build_dmatable(ide_drive_t *, struct request *);
+extern void ide_destroy_dmatable(ide_drive_t *);
+extern int ide_release_dma(ide_hwif_t *);
+extern void ide_setup_dma(ide_hwif_t *, unsigned long, unsigned int);
+
+extern int __ide_dma_host_off(ide_drive_t *);
+extern int __ide_dma_off_quietly(ide_drive_t *);
+extern int __ide_dma_host_on(ide_drive_t *);
+extern int __ide_dma_on(ide_drive_t *);
+extern int __ide_dma_check(ide_drive_t *);
+extern int ide_dma_setup(ide_drive_t *);
+extern void ide_dma_start(ide_drive_t *);
+extern int __ide_dma_end(ide_drive_t *);
+extern int __ide_dma_lostirq(ide_drive_t *);
+extern int __ide_dma_timeout(ide_drive_t *);
+#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
+
+#else
+static inline int ide_use_dma(ide_drive_t *drive) { return 0; }
+static inline int __ide_dma_off(ide_drive_t *drive) { return 0; }
+static inline void ide_dma_verbose(ide_drive_t *drive) { ; }
+#endif /* CONFIG_BLK_DEV_IDEDMA */
+
+#ifndef CONFIG_BLK_DEV_IDEDMA_PCI
+static inline void ide_release_dma(ide_hwif_t *drive) {;}
+#endif
+
+extern int ide_hwif_request_regions(ide_hwif_t *hwif);
+extern void ide_hwif_release_regions(ide_hwif_t* hwif);
+extern void ide_unregister (unsigned int index);
+
+void ide_register_region(struct gendisk *);
+void ide_unregister_region(struct gendisk *);
+
+void ide_undecoded_slave(ide_hwif_t *);
+
+int probe_hwif_init_with_fixup(ide_hwif_t *, void (*)(ide_hwif_t *));
+extern int probe_hwif_init(ide_hwif_t *);
+
+static inline void *ide_get_hwifdata (ide_hwif_t * hwif)
+{
+	return hwif->hwif_data;
+}
+
+static inline void ide_set_hwifdata (ide_hwif_t * hwif, void *data)
+{
+	hwif->hwif_data = data;
+}
+
+/* ide-lib.c */
+extern u8 ide_dma_speed(ide_drive_t *drive, u8 mode);
+extern u8 ide_rate_filter(u8 mode, u8 speed); 
+extern int ide_dma_enable(ide_drive_t *drive);
+extern char *ide_xfer_verbose(u8 xfer_rate);
+extern void ide_toggle_bounce(ide_drive_t *drive, int on);
+extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);
+
+u8 ide_dump_status(ide_drive_t *, const char *, u8);
+
+typedef struct ide_pio_timings_s {
+	int	setup_time;	/* Address setup (ns) minimum */
+	int	active_time;	/* Active pulse (ns) minimum */
+	int	cycle_time;	/* Cycle time (ns) minimum = (setup + active + recovery) */
+} ide_pio_timings_t;
+
+typedef struct ide_pio_data_s {
+	u8 pio_mode;
+	u8 use_iordy;
+	u8 overridden;
+	u8 blacklisted;
+	unsigned int cycle_time;
+} ide_pio_data_t;
+
+extern u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d);
+extern const ide_pio_timings_t ide_pio_timings[6];
+
+
+extern spinlock_t ide_lock;
+extern struct semaphore ide_cfg_sem;
+/*
+ * Structure locking:
+ *
+ * ide_cfg_sem and ide_lock together protect changes to
+ * ide_hwif_t->{next,hwgroup}
+ * ide_drive_t->next
+ *
+ * ide_hwgroup_t->busy: ide_lock
+ * ide_hwgroup_t->hwif: ide_lock
+ * ide_hwif_t->mate: constant, no locking
+ * ide_drive_t->hwif: constant, no locking
+ */
+
+#define local_irq_set(flags)	do { local_save_flags((flags)); local_irq_enable(); } while (0)
+
+extern struct bus_type ide_bus_type;
+
+/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
+#define ide_id_has_flush_cache(id)	((id)->cfs_enable_2 & 0x3000)
+
+/* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
+#define ide_id_has_flush_cache_ext(id)	\
+	(((id)->cfs_enable_2 & 0x2400) == 0x2400)
+
+#endif /* _IDE_H */