From owner-freebsd-embedded@FreeBSD.ORG  Tue Mar 18 11:35:03 2014
Return-Path: <owner-freebsd-embedded@FreeBSD.ORG>
Delivered-To: freebsd-embedded@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 74A00E79
 for <freebsd-embedded@freebsd.org>; Tue, 18 Mar 2014 11:35:03 +0000 (UTC)
Received: from mail-qc0-x233.google.com (mail-qc0-x233.google.com
 [IPv6:2607:f8b0:400d:c01::233])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 39642196
 for <freebsd-embedded@freebsd.org>; Tue, 18 Mar 2014 11:35:03 +0000 (UTC)
Received: by mail-qc0-f179.google.com with SMTP id m20so7434767qcx.24
 for <freebsd-embedded@freebsd.org>; Tue, 18 Mar 2014 04:35:02 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:date:message-id:subject:from:to:content-type;
 bh=6BxDlXK4zHb9Kx9HxC7hf9SEtCyL1PpFCJwXvbmYM/s=;
 b=TURgs7lhOLi7XKXjo91EgDYUPvjHeL9PL9gX35Sas36UVDyGKaqK1OfgrK6mlYk9zt
 CjG8qCU3JCfawweZh7niI5A83gt5hDnd1a6PvbKcTBWLmzgT6lER656XwNWX2dMH13ce
 0A6E1MFqp9n9YKx1E0ri2BLpmjvl2L4JNdxv28G7qgCoL5ZZ3Z2w+gSvt61gDWBTOo9F
 W4FD1Hu+X+EMrTcDVoT1KghkuANGH5/xRcbt4ptAUh4Gc0NH3V62gb1GRLqmLoI1RcbS
 oeKRwqZBYMzeTqY3SZpyC+3lrL50ymRCV69bdRcFn8Y6EzePncPp2SM64rFYpiyEVITR
 T2fw==
MIME-Version: 1.0
X-Received: by 10.140.98.203 with SMTP id o69mr1616051qge.102.1395142502424;
 Tue, 18 Mar 2014 04:35:02 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.224.8.137 with HTTP; Tue, 18 Mar 2014 04:35:02 -0700 (PDT)
Date: Tue, 18 Mar 2014 04:35:02 -0700
X-Google-Sender-Auth: hzryyHC88TrqV3unzr3dn9_tXTo
Message-ID: <CAJ-VmonpUsvXFHMCyH--3S4AEocTjhESCyjp9UmT-w5GyuZmvw@mail.gmail.com>
Subject: nand controller - how should one handle controllers that want the
 command+address bits together?
From: Adrian Chadd <adrian@freebsd.org>
To: "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org>
Content-Type: text/plain; charset=ISO-8859-1
X-BeenThere: freebsd-embedded@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Dedicated and Embedded Systems <freebsd-embedded.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-embedded>, 
 <mailto:freebsd-embedded-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-embedded/>
List-Post: <mailto:freebsd-embedded@freebsd.org>
List-Help: <mailto:freebsd-embedded-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-embedded>, 
 <mailto:freebsd-embedded-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 18 Mar 2014 11:35:03 -0000

Hiya,

I've got the atheros ar934x nand controller bits looking like they're
working on freebsd-head enough to send/receive a READID command with
an address of 0x0. However, the NAND controller sends commands with
the cmd and address phases as part of the command, rather than calling
send_command / send_address methods called multiple times.

It seems like our nandbus and nand controller layer is a very thin
shim over what the NAND control messages look like, rather than some
higher level 'thing' that allows for slightly more intelligent (read:
DMA/ECC capable) hardware.

So, what gives?


-a