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Date: Wed, 5 Jan 2005 13:59:02 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Reply-To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: libata PATA support - work items?
Cc: Jeff Garzik <jgarzik@pobox.com>, Eric Mudama <edmudama@gmail.com>,
       Albert Lee <albertcc@tw.ibm.com>, IDE Linux <linux-ide@vger.kernel.org>,
       Doug Maxey <dwm@maxeymade.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Jens Axboe <axboe@suse.de>
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On Wed, 05 Jan 2005 00:50:05 +0000, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> On Maw, 2005-01-04 at 23:41, Jeff Garzik wrote:
> > So, that said, I think it is important for libata to fully support PATA,
> > if it is to support it at all.  That means handling the errata that Alan
> > always bugs me about, and that means handling C/H/S support as well.
> 
> I think so. If it supports all the features of the old IDE layer we get
> to have a party when we eliminate the need for drivers/ide once and for
> all.
> 
> That means
> - Hotplug (controller and disk)
> - CHS
> - "Not quite generic" IDE DMA (eg CS5520)
> - VDMA (eg CS5520)
> - IORDY timers (not handled well in drivers/ide but needed)
> - Funky Maxtor "LBA48.. maybe" oddments
> - Missing slave detection
> - Controller errata hooks (modes, drives, timings, "dont touch during an
> I/O" etc)
> - Drive nIEN bugs
> - No nIEN cases
> - Drives that don't do some DMA/modes right
> - Crazy shit "Don't DMA from the page below 640K" (not handled by
> drivers/ide but an AMD errata
>         fixed by using a PS/2 mouse)
> - Serialize (RZ1000, CMD640, some 469, etc)
> - Bandwidth arbiter (not in drivers/ide but needed)
> - Non PCI shared IRQ mess 8(
> 
> Hopefully most of this can be buried away in a pata-errata.c 8)

:-)

few more:
- Power Management for devices
- 32 bit I/O support
- Multiple Mode PIO support
- Host Protected Area support
  (can be done from user-space but "coldplug" is needed)
- ide-{cd,disk,floppy,tape}.c specific quirks