2. MIPS AU1XXX IDE driver

Released 2005-07-15

2.1. About

This file describes the 'drivers/ide/au1xxx-ide.c', related files and the services they provide.

If you are short in patience and just want to know how to add your hard disc to the white or black list, go to the 'ADD NEW HARD DISC TO WHITE OR BLACK LIST' section.

2.2. License

Copyright

© 2003-2005 AMD, Personal Connectivity Solutions

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

THIS SOFTWARE IS PROVIDED AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

Note:

for more information, please refer "AMD Alchemy Au1200/Au1550 IDE Interface and Linux Device Driver" Application Note.

2.3. Files, Configs and Compatibility

Two files are introduced:

  1. 'arch/mips/include/asm/mach-au1x00/au1xxx_ide.h' contains : struct _auide_hwif

    • timing parameters for PIO mode 0/1/2/3/4

    • timing parameters for MWDMA 0/1/2

  2. 'drivers/ide/mips/au1xxx-ide.c' contains the functionality of the AU1XXX IDE driver

Following extra configs variables are introduced:

CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA

  • enable the PIO+DBDMA mode

CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA

  • enable the MWDMA mode

2.4. Supported IDE Modes

The AU1XXX IDE driver supported all PIO modes - PIO mode 0/1/2/3/4 - and all MWDMA modes - MWDMA 0/1/2 -. There is no support for SWDMA and UDMA mode.

To change the PIO mode use the program hdparm with option -p, e.g. 'hdparm -p0 [device]' for PIO mode 0. To enable the MWDMA mode use the option -X, e.g. 'hdparm -X32 [device]' for MWDMA mode 0.

2.5. Performance Configurations

If the used system doesn't need USB support enable the following kernel configs:

CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_BLK_DEV_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDE_AU1XXX=y
CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
CONFIG_BLK_DEV_IDEDMA=y

Also define 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to enable the burst support on DBDMA controller.

If the used system need the USB support enable the following kernel configs for high IDE to USB throughput.

CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_BLK_DEV_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDE_AU1XXX=y
CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
CONFIG_BLK_DEV_IDEDMA=y

Also undefine 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to disable the burst support on DBDMA controller.

2.6. Acknowledgments

These drivers wouldn't have been done without the base of kernel 2.4.x AU1XXX IDE driver from AMD.

Additional input also from: Matthias Lenk <matthias.lenk@amd.com>

Happy hacking!

Enrico Walther <enrico.walther@amd.com>