/*	$NetBSD: scsi_message.h,v 1.8 2002/04/23 09:46:51 bouyer Exp $	*/

/* Messages (1 byte) */		     /* I/T (M)andatory or (O)ptional */
#define MSG_CMDCOMPLETE		0x00 /* M/M */
#define MSG_EXTENDED		0x01 /* O/O */
#define MSG_SAVEDATAPOINTER	0x02 /* O/O */
#define MSG_RESTOREPOINTERS	0x03 /* O/O */
#define MSG_DISCONNECT		0x04 /* O/O */
#define MSG_INITIATOR_DET_ERR	0x05 /* M/M */
#define MSG_ABORT		0x06 /* O/M */
#define MSG_MESSAGE_REJECT	0x07 /* M/M */
#define MSG_NOOP		0x08 /* M/M */
#define MSG_PARITY_ERROR	0x09 /* M/M */
#define MSG_LINK_CMD_COMPLETE	0x0a /* O/O */
#define MSG_LINK_CMD_COMPLETEF	0x0b /* O/O */
#define MSG_BUS_DEV_RESET	0x0c /* O/M */
#define MSG_ABORT_TAG		0x0d /* O/O */
#define MSG_CLEAR_QUEUE		0x0e /* O/O */
#define MSG_INIT_RECOVERY	0x0f /* O/O */
#define MSG_REL_RECOVERY	0x10 /* O/O */
#define MSG_TERM_IO_PROC	0x11 /* O/O */

/* Messages (2 byte) */
#define MSG_SIMPLE_Q_TAG	0x20 /* O/O */
#define MSG_HEAD_OF_Q_TAG	0x21 /* O/O */
#define MSG_ORDERED_Q_TAG	0x22 /* O/O */
#define MSG_IGN_WIDE_RESIDUE	0x23 /* O/O */

/* Identify message */		     /* M/M */	
#define MSG_IDENTIFYFLAG	0x80 
#define MSG_IDENTIFY_DISCFLAG	0x40
#define MSG_IDENTIFY(lun, disc)	\
	(MSG_IDENTIFYFLAG | ((disc) ? MSG_IDENTIFY_DISCFLAG : 0) | (lun))
#define MSG_ISIDENTIFY(m)	((m) & MSG_IDENTIFYFLAG)

/* Extended messages (opcode and length) */
#define MSG_EXT_SDTR		0x01
#define MSG_EXT_SDTR_LEN	0x03

#define MSG_EXT_WDTR		0x03
#define MSG_EXT_WDTR_LEN	0x02

#define MSG_EXT_WDTR_BUS_8_BIT	0x00
#define MSG_EXT_WDTR_BUS_16_BIT	0x01
#define MSG_EXT_WDTR_BUS_32_BIT	0x02 

#define MSG_EXT_PPR		0x04
#define MSG_EXT_PPR_LEN		0x06
/*
 * Offsets:	0x3: transfer period factor
 * 		0x4: reserved
 * 		0x5: REQ/ACK offset
 *		0x6: transfer width exponent
 *		0x7: flags
 */
#define MSG_EXT_PPR_IU		0x01
#define MSG_EXT_PPR_DT		0x02
#define MSG_EXT_PPR_QAS		0x04
#define MSG_EXT_PPR_HOLDMCS	0x08
#define MSG_EXT_PPR_WRFLOW	0x10
#define MSG_EXT_PPR_RDSTRM	0x20
#define MSG_EXT_PPR_RTI		0x40
#define MSG_EXT_PPR_PCOM	0x80

#define MSG_ISEXTENDED(m)	((m) == MSG_EXTENDED)

/* message length */
#define MSG_IS1BYTE(m)	\
	((!MSG_ISEXTENDED(m) && (m) < 0x20) || MSG_ISIDENTIFY(m))
#define MSG_IS2BYTE(m)		(((m) & 0xf0) == 0x20)