From owner-freebsd-firewire@FreeBSD.ORG  Wed May 19 01:13:20 2004
Return-Path: <owner-freebsd-firewire@FreeBSD.ORG>
Delivered-To: freebsd-firewire@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 7E09A16A4CE
	for <freebsd-firewire@freebsd.org>;
	Wed, 19 May 2004 01:13:20 -0700 (PDT)
Received: from herring.rabson.org (mailgate.nlsystems.com [80.177.232.242])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 897E743D31
	for <freebsd-firewire@freebsd.org>;
	Wed, 19 May 2004 01:13:19 -0700 (PDT)
	(envelope-from dfr@nlsystems.com)
Received: from herring.rabson.org (herring.rabson.org [10.0.0.2])
	by herring.rabson.org (8.12.11/8.12.11) with ESMTP id i4J8BhsY008862;
	Wed, 19 May 2004 09:11:43 +0100 (BST)
	(envelope-from dfr@nlsystems.com)
From: Doug Rabson <dfr@nlsystems.com>
To: freebsd-firewire@freebsd.org
Date: Wed, 19 May 2004 09:11:42 +0100
User-Agent: KMail/1.6.1
References: <Pine.GSO.4.58.0405181432030.18744@mono.arc.nasa.gov>
In-Reply-To: <Pine.GSO.4.58.0405181432030.18744@mono.arc.nasa.gov>
MIME-Version: 1.0
Content-Disposition: inline
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <200405190911.42668.dfr@nlsystems.com>
X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63
X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on herring.rabson.org
X-Virus-Scanned: ClamAV version 'clamd / ClamAV version 0.65', clamav-milter
	version '0.60p'
Subject: Re: async bug
X-BeenThere: freebsd-firewire@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Firewire support in FreeBSD <freebsd-firewire.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-firewire>,
	<mailto:freebsd-firewire-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-firewire>
List-Post: <mailto:freebsd-firewire@freebsd.org>
List-Help: <mailto:freebsd-firewire-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-firewire>,
	<mailto:freebsd-firewire-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 19 May 2004 08:13:20 -0000

On Tuesday 18 May 2004 22:33, Buzz Slye wrote:
>     The code for the version of 2004/03/28 does not appear to work
> correctly for an asyncronus request of a single register.
>
>     (i.e., try:    fwcontrol -b 0)
>
>      R. E. Slye
>      NASA/Ames

The ioctl api is very confusing to use. I had to use the kernel debugger 
to get my test program that reads quads over the bus to work. The code 
below should work:

uint32_t
fw_read_quad(int fd, int node, uint64_t addr)
{
	struct fw_asyreq req;

	memset(&req, 0, sizeof req);
	req.req.type = FWASREQNODE;
	req.req.len = sizeof(req.pkt.mode.rreqq) + 2*sizeof(uint32_t);
	req.pkt.mode.rreqq.dst = FWLOCALBUS | node;
	req.pkt.mode.rreqq.tcode = FWTCODE_RREQQ;
	req.pkt.mode.rreqq.dest_hi = addr >> 32;
	req.pkt.mode.rreqq.dest_lo = addr;

	if (ioctl(fd, FW_ASYREQ, &req) < 0) {
       		err(1, "ioctl");
		return 0;
	}

	return req.pkt.mode.rresq.data;
}