.\"	$NetBSD: iop.4,v 1.5 2000/12/11 13:53:11 ad Exp $
.\"
.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Andrew Doran.
.\"
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.Dd November 8, 2000
.Dt IOP 4
.Os
.Sh NAME
.Nm iop
.Nd
.Tn I2O adapter driver
.Sh SYNOPSIS
.Cd "iop* at pci? dev ? function ?"
.Cd "iopsp*" at iop? tid ?
.Cd "ld*" at iop? tid ?
.Sh DESCRIPTION
The
.Nm
driver provides support for
.Tn PCI
adapters conforming to the
.Tn I2O
specification, revision 1.5.
.Sh IOCTL INTERFACE
The following structures and constants are defined in
.Pa dev/i2o/i2ovar.h .
Note that the header
.Pa dev/i2o/i2o.h
is a prerequsite and must therefore be included beforehand.
.Bl -tag -width OTTF
.It Dv IOPIOCPT (struct ioppt)
Submit a message to the IOP and return the reply.  Note that the return
value of this ioctl is not affected by completion status as indicated by the
reply. 
.Bd -literal
struct ioppt {
	void	*pt_msg;	/* pointer to message buffer */
	size_t	pt_msglen;	/* message buffer size in bytes */
	void	*pt_reply;	/* pointer to reply buffer */
	size_t	pt_replylen;	/* reply buffer size in bytes */
	int	pt_timo;	/* completion timeout in ms */
	int	pt_nbufs;	/* number of transfers */
	struct	ioppt_buf pt_bufs[IOP_MAX_MSG_XFERS]; /* transfers */
};

struct ioppt_buf {
	void	*ptb_data;	/* pointer to buffer */
	size_t	ptb_datalen;	/* buffer size in bytes */
	int	ptb_out;	/* non-zero if transfer is to IOP */
};
.Ed
.Pp
The minimum timeout value that may be specified is 1000ms.  All other values
must not exceed the
.Nm
driver's operational limits.
.It Dv IOPIOCGLCT (struct iovec)
Return the
.Nm
driver's copy of the logical configuration table.  This copy of the LCT
matches the current device configuration, but is not necessarily the latest
available version of the LCT.  This ioctl may block while attempting to
acquire a lock on the LCT, and may fail if the acquisition times out.
.It Dv IOPIOCGSTATUS (struct iovec)
Request the latest available status record from the IOP.  This special-case
ioctl is provided as the I2O_EXEC_STATUS_GET message does not post replies,
and can therefore not be safely issued using the IOPIOCPT ioctl.
.It Dv IOPIOCRECONFIG
Request that the
.Nm
driver scan all bus ports, retrieve the latest version of the LCT, and
attach or detach devices as necessary.  Note that higher-level
reconfiguration tasks (such as logically re-scanning SCSI busses) will not
be performed by this ioctl.
.El
.Sh FILES
.Bl -tag -width /dev/iopn -compact
.It Pa /dev/iop Ns Ar u
control device for IOP unit
.Ar u
.El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr iopsp 4 ,
.Xr ld 4 ,
.Xr iopctl 8
.Pp
http://www.i2osig.org/
.Sh AUTHOR
The
.Nm
driver was written by Andrew Doran
.Aq ad@netbsd.org .
.Sh HISTORY
The
.Nm
driver first appeared in
.Nx 1.6 .