linux-imx

/*

 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)

 */

​

/*

 *  Original authors:   abramov@cecmow.enet.dec.com (Igor Abramov)

 *          mlord@pobox.com (Mark Lord)

 *

 *  See linux/MAINTAINERS for address of current maintainer.

 *

 *  This file provides support for the advanced features and bugs

 *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.

 *

 *  These chips are basically fucked by design, and getting this driver

 *  to work on every motherboard design that uses this screwed chip seems

 *  bloody well impossible.  However, we're still trying.

 *

 *  Version 0.97 worked for everybody.

 *

 *  User feedback is essential.  Many thanks to the beta test team:

 *

 *  A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,

 *  bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,

 *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,

 *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,

 *  flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,

 *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,

 *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,

 *  peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,

 *  s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,

 *  steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com

 *  liug@mama.indstate.edu, and others.

 *

 *  Version 0.01    Initial version, hacked out of ide.c,

 *          and #include'd rather than compiled separately.

 *          This will get cleaned up in a subsequent release.

 *

 *  Version 0.02    Fixes for vlb initialization code, enable prefetch

 *          for versions 'B' and 'C' of chip by default,

 *          some code cleanup.

 *

 *  Version 0.03    Added reset of secondary interface,

 *          and black list for devices which are not compatible

 *          with prefetch mode. Separate function for setting

 *          prefetch is added, possibly it will be called some

 *          day from ioctl processing code.

 *

 *  Version 0.04    Now configs/compiles separate from ide.c

 *

 *  Version 0.05    Major rewrite of interface timing code.

 *          Added new function cmd640_set_mode to set PIO mode

 *          from ioctl call. New drives added to black list.

 *

 *  Version 0.06    More code cleanup. Prefetch is enabled only for

 *          detected hard drives, not included in prefetch

 *          black list.

 *

 *  Version 0.07    Changed to more conservative drive tuning policy.

 *          Unknown drives, which report PIO < 4 are set to

 *          (reported_PIO - 1) if it is supported, or to PIO0.

 *          List of known drives extended by info provided by

 *          CMD at their ftp site.

 *