From mboxrd@z Thu Jan 1 00:00:00 1970 From: "jameshsu" Subject: Re: Acard ATP8620 2SATA / 1 IDE driver - AHCI.C Nov082007 Date: Tue, 27 Nov 2007 18:18:02 +0800 Message-ID: <015401c830de$da8b62e0$6200a8c0@jameshsu> References: <00b501c81ace$ece895f0$6200a8c0@jameshsu> <47270656.7080205@garzik.org> <003701c81c63$cee89c30$6200a8c0@jameshsu> <025c01c82016$fbcf3810$d400a8c0@laurence> <025001c82067$d76c04c0$6200a8c0@jameshsu> <20071107221355.GB15784@havoc.gtf.org> <001f01c821b0$20b6c9f0$6200a8c0@jameshsu> <02d301c821e2$25dc01c0$d400a8c0@laurence> <005e01c821fb$502be120$6200a8c0@jameshsu> <20071108162229.GB31492@havoc.gtf.org> Reply-To: "jameshsu" Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from 219-80-62-20.static.tfn.net.tw ([219.80.62.20]:2607 "EHLO Thunder.acard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753764AbXK0KU1 (ORCPT ); Tue, 27 Nov 2007 05:20:27 -0500 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: James Bottomley , Matti Aarnio , tytso@us.ibm.com, IDE/ATA development list , Andrew Morton Jeff, First, appreciate for taking few minutes to answer my short question: 1) How is the status of ACARD Linux SATA driver after spec studying??. Any progress and any qustion/help needed from Acard, esp., AHCI support?? If you have draft open source(driver) now, do you mind to share with us! Please advise! Thanks! Best regards & happy holiday season! James ----- Original Message ----- From: Jeff Garzik To: jameshsu Cc: Jason Wu ; LaurenceWu ; Andrew Morton ; IDE/ATA development list ; tytso@us.ibm.com ; Matti Aarnio ; James Bottomley ; Daniel Weng Sent: Friday, November 09, 2007 12:22 AM Subject: Re: Acard ATP8620 2SATA / 1 IDE driver - AHCI.C Nov082007 On Thu, Nov 08, 2007 at 07:34:22PM +0800, jameshsu wrote: > From: LaurenceWu > We didn't study about ata/ahci.c, but it should be based on AHCI1.0 or 1.1 > spec. That is, NO P.M. FIS base switching, but supports both non-NCQ and NCQ > protocols. > > For NCQ or nonNCQ, 8620 is very AHCI-like, although not fully compatible, > programmer can easily modify standard ahci.c > for 8620. The main differences between 8620 and AHCI are : > > 1. PRD table format changed, (please compare AHCI 1.x section 4.2.3.3 and > 8620 datasheet section 7.3), 'I' bit in 8620 is defined as 'EOT' and NO > PRDTL value are available in the > Command List Structure. > > 2. For NCQ transfer, PxIS bit 3(SDBS) is changed. ATP8620 add the Reg_144h > to accumulate 32 Sactive bits in each SDB FIS. > The Reg_144h is RWC and all its 32 bits are 'ORed' to form the PxIS > bit3 and interrupt, if PxIE bit 3 enabled. > > Yes. Modifying the ata/ahci.c is OK to support atp8620. This is good information, thanks. After studying the datasheet I also noted a couple differences: 1) Port Multiplier support appears different from standard AHCI. 2) This chip includes target mode support. Very nice, well done! I hope that standard AHCI eventually supports this nice feature! Jeff