ide.h

linux得一些常用命令,以及linux环境下的c编程

#define IDE_DRIVER_MODULE		2

typedef int	(ide_module_init_proc)(void);

typedef struct ide_module_s {
	int				type;
	ide_module_init_proc		*init;
	void				*info;
	struct ide_module_s		*next;
} ide_module_t;

/*
 * 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 */
extern	ide_module_t	*ide_modules;
extern	ide_module_t	*ide_probe;
#endif
extern int noautodma;

/*
 * We need blk.h, but we replace its end_request by our own version.
 */
#define IDE_DRIVER		/* Toggle some magic bits in blk.h */
#define LOCAL_END_REQUEST	/* Don't generate end_request in blk.h */
#include <linux/blk.h>

void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);

/*
 * This is used for (nearly) all data transfers from/to the IDE interface
 * FIXME for 2.5, to a pointer pass verses memcpy........
 */
void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);

/*
 * This is used for (nearly) all ATAPI data transfers from/to the IDE interface
 * FIXME for 2.5, to a pointer pass verses memcpy........
 */
void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount);
void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount);

int drive_is_ready (ide_drive_t *drive);

/*
 * This is used on exit from the driver, to designate the next irq handler
 * and also to start the safety timer.
 */
void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry);

/*
 * Error reporting, in human readable form (luxurious, but a memory hog).
 */
byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);

/*
 * ide_error() takes action based on the error returned by the controller.
 * The caller should return immediately after invoking this.
 */
ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);

/*
 * Issue a simple drive command
 * The drive must be selected beforehand.
 */
void ide_cmd (ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler);

/*
 * 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.
 */
void ide_fixstring (byte *s, const int bytecount, const int byteswap);

/*
 * 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;
 */
int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, byte good, byte bad, unsigned long timeout);

int ide_wait_noerr (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);

/*
 * This routine is called from the partition-table code in genhd.c
 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
 */
int ide_xlate_1024 (kdev_t, int, int, const char *);

/*
 * Convert kdev_t structure into ide_drive_t * one.
 */
ide_drive_t *get_info_ptr (kdev_t i_rdev);

/*
 * Return the current idea about the total capacity of this drive.
 */
unsigned long current_capacity (ide_drive_t *drive);

/*
 * Start a reset operation for an IDE interface.
 * The caller should return immediately after invoking this.
 */
ide_startstop_t ide_do_reset (ide_drive_t *);

/*
 * Re-Start an operation for an IDE interface.
 * The caller should return immediately after invoking this.
 */
ide_startstop_t restart_request (ide_drive_t *);

/*
 * This function is intended to be used prior to invoking ide_do_drive_cmd().
 */
void ide_init_drive_cmd (struct request *rq);

/*
 * "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_end		/* insert rq at end of list, but don't wait for it */
} ide_action_t;

/*
 * temporarily mapping a (possible) highmem bio
 */
#define ide_rq_offset(rq) (((rq)->hard_cur_sectors - (rq)->current_nr_sectors) << 9)

extern inline void *ide_map_buffer(struct request *rq, unsigned long *flags)
{
	return bh_kmap_irq(rq->bh, flags) + ide_rq_offset(rq);
}

extern inline void ide_unmap_buffer(char *buffer, unsigned long *flags)
{
	bh_kunmap_irq(buffer, flags);
}

/*
 * 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.
 */
int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);

/*
 * 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).
 */
void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);

/*
 * Issue ATA command and wait for completion. use for implementing commands in kernel
 */
int ide_wait_cmd (ide_drive_t *drive, int cmd, int nsect, int feature, int sectors, byte *buf);

int ide_wait_cmd_task (ide_drive_t *drive, byte *buf);
 
typedef struct ide_task_s {
	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;
	ide_post_handler_t	*posthandler;
	void			*special;	/* valid_t generally */
	struct request		*rq;		/* copy of request */
	unsigned long		block;		/* copy of block */
} ide_task_t;

typedef struct pkt_task_s {
	task_ioreg_t		tfRegister[8];
	int			data_phase;
	int			command_type;
	ide_handler_t		*handler;
	void			*special;
	struct request		*rq;		/* copy of request */
	unsigned long		block;		/* copy of block */
} pkt_task_t;

/*
 * taskfile io for disks for now...
 */
ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task);

/*
 * Builds request from ide_ioctl
 */
void do_taskfile (ide_drive_t *drive, struct hd_drive_task_hdr *taskfile, struct hd_drive_hob_hdr *hobfile, ide_handler_t *handler);

/*
 * Special Flagged Register Validation Caller
 */
// ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task);

ide_startstop_t set_multmode_intr (ide_drive_t *drive);
ide_startstop_t set_geometry_intr (ide_drive_t *drive);
ide_startstop_t recal_intr (ide_drive_t *drive);
ide_startstop_t task_no_data_intr (ide_drive_t *drive);
ide_startstop_t task_in_intr (ide_drive_t *drive);
ide_startstop_t task_mulin_intr (ide_drive_t *drive);
ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq);
ide_startstop_t task_out_intr (ide_drive_t *drive);
ide_startstop_t task_mulout_intr (ide_drive_t *drive);
void ide_init_drive_taskfile (struct request *rq);

int ide_wait_taskfile (ide_drive_t *drive, struct hd_drive_task_hdr *taskfile, struct hd_drive_hob_hdr *hobfile, byte *buf);

int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *cmd, byte *buf);

ide_pre_handler_t * ide_pre_handler_parser (struct hd_drive_task_hdr *taskfile, struct hd_drive_hob_hdr *hobfile);
ide_handler_t * ide_handler_parser (struct hd_drive_task_hdr *taskfile, struct hd_drive_hob_hdr *hobfile);
/* Expects args is a full set of TF registers and parses the command type */
int ide_cmd_type_parser (ide_task_t *args);

int ide_taskfile_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);

#ifdef CONFIG_PKT_TASK_IOCTL
int pkt_taskfile_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
#endif /* CONFIG_PKT_TASK_IOCTL */

void ide_delay_50ms (void);
int system_bus_clock(void);

byte ide_auto_reduce_xfer (ide_drive_t *drive);
int ide_driveid_update (ide_drive_t *drive);
int ide_ata66_check (ide_drive_t *drive, ide_task_t *args);
int ide_config_drive_speed (ide_drive_t *drive, byte speed);
byte eighty_ninty_three (ide_drive_t *drive);
int set_transfer (ide_drive_t *drive, ide_task_t *args);

/*
 * ide_system_bus_speed() returns what we think is the system VESA/PCI
 * bus speed (in MHz).  This is used for calculating interface PIO timings.
 * The default is 40 for known PCI systems, 50 otherwise.
 * The "idebus=xx" parameter can be used to override this value.
 */
int ide_system_bus_speed (void);

/*
 * ide_multwrite() transfers a block of up to mcount sectors of data
 * to a drive as part of a disk multwrite operation.
 */
int ide_multwrite (ide_drive_t *drive, unsigned int mcount);

/*
 * ide_stall_queue() can be used by a drive to give excess bandwidth back
 * to the hwgroup by sleeping for timeout jiffies.
 */
void ide_stall_queue (ide_drive_t *drive, unsigned long timeout);

/*
 * ide_get_queue() returns the queue which corresponds to a given device.
 */
request_queue_t *ide_get_queue (kdev_t dev);

/*
 * CompactFlash cards and their brethern pretend to be removable hard disks,
 * but they never have a slave unit, and they don't have doorlock mechanisms.
 * This test catches them, and is invoked elsewhere when setting appropriate config bits.
 */
int drive_is_flashcard (ide_drive_t *drive);

int ide_spin_wait_hwgroup (ide_drive_t *drive);
void ide_timer_expiry (unsigned long data);
void ide_intr (int irq, void *dev_id, struct pt_regs *regs);
void do_ide_request (request_queue_t * q);
void ide_init_subdrivers (void);

#ifndef _IDE_C
extern struct block_device_operations ide_fops[];
extern ide_proc_entry_t generic_subdriver_entries[];
#endif

int ide_reinit_drive (ide_drive_t *drive);

#ifdef _IDE_C
#ifdef CONFIG_BLK_DEV_IDE
int ideprobe_init (void);
#endif /* CONFIG_BLK_DEV_IDE */
#ifdef CONFIG_BLK_DEV_IDEDISK
int idedisk_reinit (ide_drive_t *drive);
int idedisk_init (void);
#endif /* CONFIG_BLK_DEV_IDEDISK */
#ifdef CONFIG_BLK_DEV_IDECD
int ide_cdrom_reinit (ide_drive_t *drive);
int ide_cdrom_init (void);
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
int idetape_reinit (ide_drive_t *drive);
int idetape_init (void);
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
int idefloppy_reinit (ide_drive_t *drive);
int idefloppy_init (void);
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
int idescsi_reinit (ide_drive_t *drive);
int idescsi_init (void);
#endif /* CONFIG_BLK_DEV_IDESCSI */
#endif /* _IDE_C */

int ide_register_module (ide_module_t *module);
void ide_unregister_module (ide_module_t *module);
ide_drive_t *ide_scan_devices (byte media, const char *name, ide_driver_t *driver, int n);
int ide_register_subdriver (ide_drive_t *drive, ide_driver_t *driver, int version);
int ide_unregister_subdriver (ide_drive_t *drive);
int ide_replace_subdriver(ide_drive_t *drive, const char *driver);

#ifdef CONFIG_BLK_DEV_IDEPCI
#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 */

unsigned long ide_find_free_region (unsigned short size) __init;
void ide_scan_pcibus (int scan_direction) __init;
#endif
#ifdef CONFIG_BLK_DEV_IDEDMA
#define BAD_DMA_DRIVE		0
#define GOOD_DMA_DRIVE		1
int ide_build_dmatable (ide_drive_t *drive, ide_dma_action_t func);
void ide_destroy_dmatable (ide_drive_t *drive);
ide_startstop_t ide_dma_intr (ide_drive_t *drive);
int check_drive_lists (ide_drive_t *drive, int good_bad);
int report_drive_dmaing (ide_drive_t *drive);
int ide_dmaproc (ide_dma_action_t func, ide_drive_t *drive);
int ide_release_dma (ide_hwif_t *hwif);
void ide_setup_dma (ide_hwif_t *hwif, unsigned long dmabase, unsigned int num_ports) __init;
unsigned long ide_get_or_set_dma_base (ide_hwif_t *hwif, int extra, const char *name) __init;
#endif

void hwif_unregister (ide_hwif_t *hwif);

void export_ide_init_queue (ide_drive_t *drive);
byte export_probe_for_drive (ide_drive_t *drive);

#endif /* _IDE_H */