ide.h

此工具是arm-linux-GCC交叉编译工具（cross-3.4.4）

#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 */