/* @(#)read.c	1.159 10/05/24 Copyright 1995-2010 J. Schilling */
#include <schily/mconfig.h>
#ifndef lint
static	UConst char sccsid[] =
	"@(#)read.c	1.159 10/05/24 Copyright 1995-2010 J. Schilling";
#endif
/*
 *	SCSI command functions for the read call
 *
 *	Copyright (c) 1995-2010 J. Schilling
 */
/*
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * See the file CDDL.Schily.txt in this distribution for details.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file CDDL.Schily.txt from this distribution.
 */

#include <schily/stdio.h>
#include <schily/standard.h>

#include <schily/utypes.h>
#include <schily/btorder.h>
#include <schily/intcvt.h>
#include <schily/schily.h>

#include <scg/scgcmd.h>
#include <scg/scsidefs.h>
#include <scg/scsireg.h>
#include <scg/scsitransp.h>

#include "libscgcmd.h"

EXPORT	int	read_scsi	__PR((SCSI *scgp, caddr_t, long, int));
EXPORT	int	read_g0		__PR((SCSI *scgp, caddr_t, long, int));
EXPORT	int	read_g1		__PR((SCSI *scgp, caddr_t, long, int));

#define	G0_MAXADDR	0x1FFFFFL

EXPORT int
read_scsi(scgp, bp, addr, cnt)
	SCSI	*scgp;
	caddr_t	bp;
	long	addr;
	int	cnt;
{
	if (addr <= G0_MAXADDR && cnt < 256 && !__is_atapi())
		return (read_g0(scgp, bp, addr, cnt));
	else
		return (read_g1(scgp, bp, addr, cnt));
}

EXPORT int
read_g0(scgp, bp, addr, cnt)
	SCSI	*scgp;
	caddr_t	bp;
	long	addr;
	int	cnt;
{
	register struct	scg_cmd	*scmd = scgp->scmd;

	if (scgp->cap->c_bsize <= 0)
		raisecond("capacity_not_set", 0L);

	fillbytes((caddr_t)scmd, sizeof (*scmd), '\0');
	scmd->addr = bp;
	scmd->size = cnt*scgp->cap->c_bsize;
	scmd->flags = SCG_RECV_DATA|SCG_DISRE_ENA;
	scmd->cdb_len = SC_G0_CDBLEN;
	scmd->sense_len = CCS_SENSE_LEN;
	scmd->cdb.g0_cdb.cmd = SC_READ;
	scmd->cdb.g0_cdb.lun = scg_lun(scgp);
	g0_cdbaddr(&scmd->cdb.g0_cdb, addr);
	scmd->cdb.g0_cdb.count = cnt;
/*	scmd->cdb.g0_cdb.vu_56 = 1;*/

	scgp->cmdname = "read_g0";

	return (scg_cmd(scgp));
}

EXPORT int
read_g1(scgp, bp, addr, cnt)
	SCSI	*scgp;
	caddr_t	bp;
	long	addr;
	int	cnt;
{
	register struct	scg_cmd	*scmd = scgp->scmd;

	if (scgp->cap->c_bsize <= 0)
		raisecond("capacity_not_set", 0L);

	fillbytes((caddr_t)scmd, sizeof (*scmd), '\0');
	scmd->addr = bp;
	scmd->size = cnt*scgp->cap->c_bsize;
	scmd->flags = SCG_RECV_DATA|SCG_DISRE_ENA;
	scmd->cdb_len = SC_G1_CDBLEN;
	scmd->sense_len = CCS_SENSE_LEN;
	scmd->cdb.g1_cdb.cmd = SC_EREAD;
	scmd->cdb.g1_cdb.lun = scg_lun(scgp);
	g1_cdbaddr(&scmd->cdb.g1_cdb, addr);
	g1_cdblen(&scmd->cdb.g1_cdb, cnt);

	scgp->cmdname = "read_g1";

	return (scg_cmd(scgp));
}