/*-
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)mtio.h	8.1 (Berkeley) 6/2/93
 * $FreeBSD: stable/7/sys/sys/mtio.h 139825 2005-01-07 02:29:27Z imp $
 */

#ifndef	_SYS_MTIO_H_
#define	_SYS_MTIO_H_

#ifndef _KERNEL
#include <sys/types.h>
#endif
#include <sys/ioccom.h>

/*
 * Structures and definitions for mag tape io control commands
 */

/* structure for MTIOCTOP - mag tape op command */
struct mtop {
	short	mt_op;		/* operations defined below */
	int32_t	mt_count;	/* how many of them */
};

/* operations */
#define MTWEOF		0	/* write an end-of-file record */
#define MTFSF		1	/* forward space file */
#define MTBSF		2	/* backward space file */
#define MTFSR		3	/* forward space record */
#define MTBSR		4	/* backward space record */
#define MTREW		5	/* rewind */
#define MTOFFL		6	/* rewind and put the drive offline */
#define MTNOP		7	/* no operation, sets status only */
#define MTCACHE		8	/* enable controller cache */
#define MTNOCACHE	9	/* disable controller cache */

#if defined(__FreeBSD__)
/* Set block size for device. If device is a variable size dev		*/
/* a non zero parameter will change the device to a fixed block size	*/
/* device with block size set to that of the parameter passed in.	*/
/* Resetting the block size to 0 will restore the device to a variable	*/
/* block size device. */

#define MTSETBSIZ	10

/* Set density values for device. Sets the value for the opened mode only. */

#define MTSETDNSTY	11

#define MTERASE		12	/* erase to EOM */
#define MTEOD		13	/* Space to EOM */
#define MTCOMP		14	/* select compression mode 0=off, 1=def */
#define MTRETENS	15	/* re-tension tape */
#define MTWSS		16	/* write setmark(s) */
#define MTFSS		17	/* forward space setmark */
#define MTBSS		18	/* backward space setmark */

#define MT_COMP_ENABLE		0xffffffff
#define MT_COMP_DISABLED	0xfffffffe
#define MT_COMP_UNSUPP		0xfffffffd

/*
 * Values in mt_dsreg that say what the device is doing
 */
#define	MTIO_DSREG_NIL	0	/* Unknown */
#define	MTIO_DSREG_REST	1	/* Doing Nothing */
#define	MTIO_DSREG_RBSY	2	/* Communicating with tape (but no motion) */
#define	MTIO_DSREG_WR	20	/* Writing */
#define	MTIO_DSREG_FMK	21	/* Writing Filemarks */
#define	MTIO_DSREG_ZER	22	/* Erasing */
#define	MTIO_DSREG_RD	30	/* Reading */
#define	MTIO_DSREG_FWD	40	/* Spacing Forward */
#define	MTIO_DSREG_REV	41	/* Spacing Reverse */
#define	MTIO_DSREG_POS	42	/* Hardware Positioning (direction unknown) */
#define	MTIO_DSREG_REW	43	/* Rewinding */
#define	MTIO_DSREG_TEN	44	/* Retensioning */
#define	MTIO_DSREG_UNL	45	/* Unloading */
#define	MTIO_DSREG_LD	46	/* Loading */

#endif	/* __FreeBSD__ */

/* structure for MTIOCGET - mag tape get status command */

struct mtget {
	short	mt_type;	/* type of magtape device */
/* the following two registers are grossly device dependent */
	short	mt_dsreg;	/* ``drive status'' register */
	short	mt_erreg;	/* ``error'' register */
/* end device-dependent registers */
	/*
	 * Note that the residual count, while maintained, may be
	 * be nonsense because the size of the residual may (greatly)
	 * exceed 32 K-bytes. Use the MTIOCERRSTAT ioctl to get a
	 * more accurate count.
	 */
	short	mt_resid;	/* residual count */
#if defined (__FreeBSD__)
	int32_t mt_blksiz;	/* presently operating blocksize */
	int32_t mt_density;	/* presently operating density */
	u_int32_t mt_comp;	/* presently operating compression */
	int32_t mt_blksiz0;	/* blocksize for mode 0 */
	int32_t mt_blksiz1;	/* blocksize for mode 1 */
	int32_t mt_blksiz2;	/* blocksize for mode 2 */
	int32_t mt_blksiz3;	/* blocksize for mode 3 */
	int32_t mt_density0;	/* density for mode 0 */
	int32_t mt_density1;	/* density for mode 1 */
	int32_t mt_density2;	/* density for mode 2 */
	int32_t mt_density3;	/* density for mode 3 */
/* the following are not yet implemented */
	u_int32_t mt_comp0;	/* compression type for mode 0 */
	u_int32_t mt_comp1;	/* compression type for mode 1 */
	u_int32_t mt_comp2;	/* compression type for mode 2 */
	u_int32_t mt_comp3;	/* compression type for mode 3 */
/* end not yet implemented */
#endif
	int32_t	mt_fileno;	/* relative file number of current position */
	int32_t	mt_blkno;	/* relative block number of current position */
};

/* structure for MTIOCERRSTAT - tape get error status command */
/* really only supported for SCSI tapes right now */
struct scsi_tape_errors {
	/*
	 * These are latched from the last command that had a SCSI
	 * Check Condition noted for these operations. The act
	 * of issuing an MTIOCERRSTAT unlatches and clears them.
	 */
	u_int8_t io_sense[32];	/* Last Sense Data For Data I/O */
	int32_t io_resid;	/* residual count from last Data I/O */
	u_int8_t io_cdb[16];	/* Command that Caused the Last Data Sense */
	u_int8_t ctl_sense[32];	/* Last Sense Data For Control I/O */
	int32_t ctl_resid;	/* residual count from last Control I/O */
	u_int8_t ctl_cdb[16];	/* Command that Caused the Last Control Sense */
	/*
	 * These are the read and write cumulative error counters.
	 * (how to reset cumulative error counters is not yet defined).
	 * (not implemented as yet but space is being reserved for them)
	 */
	struct {
		u_int32_t retries;	/* total # retries performed */
		u_int32_t corrected;	/* total # corrections performed */
		u_int32_t processed;	/* total # corrections successful */
		u_int32_t failures;	/* total # corrections/retries failed */
		u_int64_t nbytes;	/* total # bytes processed */
	} wterr, rderr;
};
	
union mterrstat {
	struct scsi_tape_errors scsi_errstat;
	char _reserved_padding[256];
};

/*
 * Constants for mt_type byte.  These are the same
 * for controllers compatible with the types listed.
 */
#define	MT_ISTS		0x01		/* TS-11 */
#define	MT_ISHT		0x02		/* TM03 Massbus: TE16, TU45, TU77 */
#define	MT_ISTM		0x03		/* TM11/TE10 Unibus */
#define	MT_ISMT		0x04		/* TM78/TU78 Massbus */
#define	MT_ISUT		0x05		/* SI TU-45 emulation on Unibus */
#define	MT_ISCPC	0x06		/* SUN */
#define	MT_ISAR		0x07		/* SUN */
#define	MT_ISTMSCP	0x08		/* DEC TMSCP protocol (TU81, TK50) */
#define MT_ISCY		0x09		/* CCI Cipher */
#define MT_ISCT		0x0a		/* HP 1/4 tape */
#define MT_ISFHP	0x0b		/* HP 7980 1/2 tape */
#define MT_ISEXABYTE	0x0c		/* Exabyte */
#define MT_ISEXA8200	0x0c		/* Exabyte EXB-8200 */
#define MT_ISEXA8500	0x0d		/* Exabyte EXB-8500 */
#define MT_ISVIPER1	0x0e		/* Archive Viper-150 */
#define MT_ISPYTHON	0x0f		/* Archive Python (DAT) */
#define MT_ISHPDAT	0x10		/* HP 35450A DAT drive */
#define MT_ISMFOUR	0x11		/* M4 Data 1/2 9track drive */
#define MT_ISTK50	0x12		/* DEC SCSI TK50 */
#define MT_ISMT02	0x13		/* Emulex MT02 SCSI tape controller */

/* mag tape io control commands */
#define	MTIOCTOP	_IOW('m', 1, struct mtop)	/* do a mag tape op */
#define	MTIOCGET	_IOR('m', 2, struct mtget)	/* get tape status */
/* these two do not appear to be used anywhere */
#define MTIOCIEOT	_IO('m', 3)			/* ignore EOT error */
#define MTIOCEEOT	_IO('m', 4)			/* enable EOT error */
/*
 * When more SCSI-3 SSC (streaming device) devices are out there
 * that support the full 32 byte type 2 structure, we'll have to
 * rethink these ioctls to support all the entities they haul into
 * the picture (64 bit blocks, logical file record numbers, etc..).
 */
#define	MTIOCRDSPOS	_IOR('m', 5, u_int32_t)	/* get logical blk addr */
#define	MTIOCRDHPOS	_IOR('m', 6, u_int32_t)	/* get hardware blk addr */
#define	MTIOCSLOCATE	_IOW('m', 5, u_int32_t)	/* seek to logical blk addr */
#define	MTIOCHLOCATE	_IOW('m', 6, u_int32_t)	/* seek to hardware blk addr */
#define	MTIOCERRSTAT	_IOR('m', 7, union mterrstat)	/* get tape errors */
/*
 * Set EOT model- argument is number of filemarks to end a tape with.
 * Note that not all possible values will be accepted.
 */
#define	MTIOCSETEOTMODEL	_IOW('m', 8, u_int32_t)
/* Get current EOT model */
#define	MTIOCGETEOTMODEL	_IOR('m', 8, u_int32_t)

#ifndef _KERNEL
#define	DEFTAPE	"/dev/nsa0"
#endif

#endif /* !_SYS_MTIO_H_ */
