ide.h

arm平台上的uclinux系统全部源代码

/*
 *  linux/drivers/block/ide.h
 *
 *  Copyright (C) 1994, 1995  Linus Torvalds & authors
 */

#include <linux/config.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
 */
#undef REALLY_FAST_IO			/* define if ide ports are perfect */
#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	0	/* 0 to reduce kernel size */
#endif
#ifndef SUPPORT_VLB_SYNC		/* 1 to support weird 32-bit chips */
#define SUPPORT_VLB_SYNC	0	/* 0 to reduce kernel size */
#endif
#ifndef DISK_RECOVERY_TIME		/* off=0; on=access_delay_time */
#define DISK_RECOVERY_TIME	0	/*  for hardware that needs it */
#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 FAKE_FDISK_FOR_EZDRIVE		/* 1 to help linux fdisk with EZDRIVE */
#define FAKE_FDISK_FOR_EZDRIVE 	1	/* 0 to reduce kernel size */
#endif
#ifndef FANCY_STATUS_DUMPS		/* 1 for human-readable drive errors */
#define FANCY_STATUS_DUMPS	1	/* 0 to reduce kernel size */
#endif

#ifdef CONFIG_BLK_DEV_CMD640
#if 0	/* change to 1 when debugging cmd640 problems */
void cmd640_dump_regs (void);
#define CMD640_DUMP_REGS cmd640_dump_regs() /* for debugging cmd640 chipset */
#endif
#endif  /* CONFIG_BLK_DEV_CMD640 */

#if	defined(CONFIG_BLK_DEV_IDECD) || defined(CONFIG_BLK_DEV_IDETAPE) || \
	defined(CONFIG_BLK_DEV_IDEFLOPPY) || defined(CONFIG_BLK_DEV_IDESCSI)
#define CONFIG_BLK_DEV_IDEATAPI 1
#endif

/*
 * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
 */
#define IDE_DRIVE_CMD		99	/* (magic) undef to reduce kernel size*/

/*
 *  "No user-serviceable parts" beyond this point  :)
 *****************************************************************************/

#if defined(CONFIG_BLK_DEV_IDESCSI) && !defined(CONFIG_SCSI)
#error "SCSI must also be selected"
#endif

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 */

/*
 * Ensure that various configuration flags have compatible settings
 */
#ifdef REALLY_SLOW_IO
#undef REALLY_FAST_IO
#endif

/*
 * Definitions for accessing IDE controller registers
 */

#define HWIF(drive)		((ide_hwif_t *)((drive)->hwif))
#define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))

#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_FEATURE_OFFSET	IDE_ERROR_OFFSET
#define IDE_COMMAND_OFFSET	IDE_STATUS_OFFSET

#define IDE_DATA_REG		(HWIF(drive)->io.io_base+(IDE_DATA_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_ERROR_REG		(HWIF(drive)->io.io_base+(IDE_ERROR_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_NSECTOR_REG		(HWIF(drive)->io.io_base+(IDE_NSECTOR_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_SECTOR_REG		(HWIF(drive)->io.io_base+(IDE_SECTOR_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_LCYL_REG		(HWIF(drive)->io.io_base+(IDE_LCYL_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_HCYL_REG		(HWIF(drive)->io.io_base+(IDE_HCYL_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_SELECT_REG		(HWIF(drive)->io.io_base+(IDE_SELECT_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_STATUS_REG		(HWIF(drive)->io.io_base+(IDE_STATUS_OFFSET<<HWIF(drive)->io.io_shift))
#define IDE_CONTROL_REG		(HWIF(drive)->io.ctl_port)
#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

#ifdef REALLY_FAST_IO
#define OUT_BYTE(b,p)		outb((b),(p))
#define IN_BYTE(p)		(byte)inb(p)
#else
#define OUT_BYTE(b,p)		outb_p((b),(p))
#define IN_BYTE(p)		(byte)inb_p(p)
#endif /* REALLY_FAST_IO */

#define GET_ERR()		IN_BYTE(IDE_ERROR_REG)
#define GET_STAT()		IN_BYTE(IDE_STATUS_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)

/*
 * Some more useful definitions
 */
#define IDE_MAJOR_NAME	"ide"	/* the same for all i/f; see also genhd.c */
#define MAJOR_NAME	IDE_MAJOR_NAME
#define PARTN_BITS	6	/* number of minor dev bits for partitions */
#define PARTN_MASK	((1<<PARTN_BITS)-1)	/* a useful bit mask */
#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
#ifndef MAX_HWIFS
#define MAX_HWIFS	4	/* an arbitrary, but realistic limit */
#endif
#define SECTOR_WORDS	(512 / 4)	/* number of 32bit words per sector */

/*
 * Timeouts for various operations:
 */
#define WAIT_DRQ	(5*HZ/100)	/* 50msec - spec allows up to 20ms */
#ifdef CONFIG_APM
#define WAIT_READY	(5*HZ)		/* 5sec - some laptops are very slow */
#else
#define WAIT_READY	(3*HZ/100)	/* 30msec - should be instantaneous */
#endif /* CONFIG_APM */
#define WAIT_PIDENTIFY	(1*HZ)	/* 1sec   - should be less than 3ms (?) */
#define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
#define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */

#if defined(CONFIG_BLK_DEV_HT6560B) || defined(CONFIG_BLK_DEV_PROMISE)
#define SELECT_DRIVE(hwif,drive)				\
{								\
	if (hwif->selectproc)					\
		hwif->selectproc(drive);			\
	else							\
		OUT_BYTE((drive)->select.all, hwif->io_base + (IDE_SELECT_OFFSET << hwif->io.io_shift)); \
}
#else
#define SELECT_DRIVE(hwif,drive)  OUT_BYTE((drive)->select.all, hwif->io.io_base + (IDE_SELECT_OFFSET << hwif->io.io_shift));
#endif	/* CONFIG_BLK_DEV_HT6560B || CONFIG_BLK_DEV_PROMISE */
		
#ifdef CONFIG_BLK_DEV_IDETAPE
#include "ide-tape.h"
#endif /* CONFIG_BLK_DEV_IDETAPE */

#ifdef CONFIG_BLK_DEV_IDECD

struct atapi_request_sense {
	unsigned char error_code : 7;
	unsigned char valid      : 1;
	byte reserved1;
	unsigned char sense_key  : 4;
	unsigned char reserved2  : 1;
	unsigned char ili        : 1;
	unsigned char reserved3  : 2;
	byte info[4];
	byte sense_len;
	byte command_info[4];
	byte asc;
	byte ascq;
	byte fru;
	byte sense_key_specific[3];
};

struct packet_command {
	char *buffer;
	int buflen;
	int stat;
	struct atapi_request_sense *sense_data;
	unsigned char c[12];
};


/* Structure of a MSF cdrom address. */
struct atapi_msf {
	byte reserved;
	byte minute;
	byte second;
	byte frame;
};


/* Space to hold the disk TOC. */

#define MAX_TRACKS 99
struct atapi_toc_header {
	unsigned short toc_length;
	byte first_track;
	byte last_track;
};

struct atapi_toc_entry {
	byte reserved1;
	unsigned control : 4;
	unsigned adr     : 4;
	byte track;
	byte reserved2;
	union {
		unsigned lba;
		struct atapi_msf msf;
	} addr;
};

struct atapi_toc {
	int    last_session_lba;
	int    xa_flag;
	unsigned capacity;
	struct atapi_toc_header hdr;
	struct atapi_toc_entry  ent[MAX_TRACKS+1];
	  /* One extra for the leadout. */
};


/* This structure is annoyingly close to, but not identical with,
   the cdrom_subchnl structure from cdrom.h. */
struct atapi_cdrom_subchnl 
{
	u_char  acdsc_reserved;
	u_char  acdsc_audiostatus;
	u_short acdsc_length;
	u_char  acdsc_format;

	u_char  acdsc_adr:	4;
	u_char  acdsc_ctrl:	4;
	u_char  acdsc_trk;
	u_char  acdsc_ind;
	union {
		struct atapi_msf msf;
		int	lba;
	} acdsc_absaddr;
	union {
		struct atapi_msf msf;
		int	lba;
	} acdsc_reladdr;
};


/* Extra per-device info for cdrom drives. */
struct cdrom_info {

	/* Buffer for table of contents.  NULL if we haven't allocated
	   a TOC buffer for this device yet. */

	struct atapi_toc *toc;

	/* Sector buffer.  If a read request wants only the first part
	   of a cdrom block, we cache the rest of the block here,
	   in the expectation that that data is going to be wanted soon.
	   SECTOR_BUFFERED is the number of the first buffered sector,
	   and NSECTORS_BUFFERED is the number of sectors in the buffer.
	   Before the buffer is allocated, we should have
	   SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */

	unsigned long sector_buffered;
	unsigned long nsectors_buffered;
	char *sector_buffer;

	/* The result of the last successful request sense command
	   on this device. */
	struct atapi_request_sense sense_data;

	int max_sectors;
};

#endif /* CONFIG_BLK_DEV_IDECD */

/*
 * Now for the data we need to maintain per-drive:  ide_drive_t
 */

typedef enum {ide_disk, ide_cdrom, ide_tape, ide_floppy, ide_scsi} ide_media_t;

typedef union {
	unsigned all			: 8;	/* all of the bits together */
	struct {
		unsigned set_geometry	: 1;	/* respecify drive geometry */
		unsigned recalibrate	: 1;	/* seek to cyl 0      */
		unsigned set_multmode	: 1;	/* set multmode count */
		unsigned set_tune	: 1;	/* tune interface for drive */
		unsigned mc		: 1;	/* acknowledge media change */
		unsigned reserved	: 3;	/* unused */
		} b;
	} special_t;

typedef union {
	unsigned all			: 8;	/* all of the bits together */
	struct {
		unsigned head		: 4;	/* always zeros here */
		unsigned unit		: 1;	/* drive select number, 0 or 1 */
		unsigned bit5		: 1;	/* always 1 */
		unsigned lba		: 1;	/* using LBA instead of CHS */
		unsigned bit7		: 1;	/* always 1 */
	} b;
	} select_t;

typedef struct ide_drive_s {
	special_t	special;	/* special action flags */
	unsigned present	: 1;	/* drive is physically present */
	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
	unsigned keep_settings  : 1;	/* restore settings after drive reset */
	unsigned busy		: 1;	/* currently doing revalidate_disk() */
	unsigned removable	: 1;	/* 1 if need to do check_media_change */
	unsigned using_dma	: 1;	/* disk is using dma for read/write */
	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
	unsigned unmask		: 1;	/* flag: okay to unmask other irqs */
	unsigned no_unmask	: 1;	/* disallow setting unmask bit */
	unsigned no_io_32bit	: 1;	/* disallow enabling 32bit I/O */
	unsigned nobios		: 1;	/* flag: do not probe bios for drive */
	unsigned slow		: 1;	/* flag: slow data port */
	unsigned autotune	: 2;	/* 1=autotune, 2=noautotune, 0=default */
#if FAKE_FDISK_FOR_EZDRIVE
	unsigned remap_0_to_1	: 1;	/* flag: partitioned with ezdrive */
#endif /* FAKE_FDISK_FOR_EZDRIVE */
	unsigned no_geom	: 1;	/* flag: do not set geometry */
	ide_media_t	media;		/* disk, cdrom, tape, floppy */
	select_t	select;		/* basic drive/head select reg value */
	byte		ctl;		/* "normal" value for IDE_CONTROL_REG */
	byte		ready_stat;	/* min status value for drive ready */
	byte		mult_count;	/* current multiple sector setting */
	byte 		mult_req;	/* requested multiple sector setting */
	byte 		tune_req;	/* requested drive tuning setting */
	byte		io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
	byte		bad_wstat;	/* used for ignoring WRERR_STAT */
	byte		sect0;		/* offset of first sector for DM6:DDO */
	byte 		usage;		/* current "open()" count for drive */
	byte 		head;		/* "real" number of heads */
	byte		sect;		/* "real" sectors per track */
	byte		bios_head;	/* BIOS/fdisk/LILO number of heads */
	byte		bios_sect;	/* BIOS/fdisk/LILO sectors per track */
	unsigned short	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
	unsigned short	cyl;		/* "real" number of cyls */
	void		  *hwif;	/* actually (ide_hwif_t *) */
	struct wait_queue *wqueue;	/* used to wait for drive in open() */
	struct hd_driveid *id;		/* drive model identification info */
	struct hd_struct  *part;	/* drive partition table */
	char		name[4];	/* drive name, such as "hda" */
#ifdef CONFIG_BLK_DEV_IDECD
	struct cdrom_info cdrom_info;	/* for ide-cd.c */
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
	idetape_tape_t	tape;		/* for ide-tape.c */
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
	void *floppy;			/* for ide-floppy.c */
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI