forked from Minki/linux
173 lines
5.7 KiB
Plaintext
173 lines
5.7 KiB
Plaintext
README for MIPS AU1XXX IDE driver - Released 2005-07-15
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ABOUT
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-----
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This file describes the 'drivers/ide/mips/au1xxx-ide.c', related files and the
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services they provide.
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If you are short in patience and just want to know how to add your hard disc to
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the white or black list, go to the 'ADD NEW HARD DISC TO WHITE OR BLACK LIST'
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section.
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LICENSE
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-------
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Copyright (c) 2003-2005 AMD, Personal Connectivity Solutions
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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675 Mass Ave, Cambridge, MA 02139, USA.
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Note: for more information, please refer "AMD Alchemy Au1200/Au1550 IDE
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Interface and Linux Device Driver" Application Note.
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FILES, CONFIGS AND COMPATABILITY
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--------------------------------
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Two files are introduced:
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a) 'include/asm-mips/mach-au1x00/au1xxx_ide.h'
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containes : struct _auide_hwif
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struct drive_list_entry dma_white_list
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struct drive_list_entry dma_black_list
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timing parameters for PIO mode 0/1/2/3/4
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timing parameters for MWDMA 0/1/2
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b) 'drivers/ide/mips/au1xxx-ide.c'
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contains the functionality of the AU1XXX IDE driver
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Four configs variables are introduced:
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CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA - enable the PIO+DBDMA mode
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CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA - enable the MWDMA mode
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CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON - set Burstable FIFO in DBDMA
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controler
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CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ - maximum transfer size
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per descriptor
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If MWDMA is enabled and the connected hard disc is not on the white list, the
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kernel switches to a "safe mwdma mode" at boot time. In this mode the IDE
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performance is substantial slower then in full speed mwdma. In this case
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please add your hard disc to the white list (follow instruction from 'ADD NEW
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HARD DISC TO WHITE OR BLACK LIST' section).
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SUPPORTED IDE MODES
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-------------------
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The AU1XXX IDE driver supported all PIO modes - PIO mode 0/1/2/3/4 - and all
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MWDMA modes - MWDMA 0/1/2 -. There is no support for SWDMA and UDMA mode.
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To change the PIO mode use the program hdparm with option -p, e.g.
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'hdparm -p0 [device]' for PIO mode 0. To enable the MWDMA mode use the option
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-X, e.g. 'hdparm -X32 [device]' for MWDMA mode 0.
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PERFORMANCE CONFIGURATIONS
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--------------------------
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If the used system doesn't need USB support enable the following kernel configs:
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CONFIG_IDE=y
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CONFIG_BLK_DEV_IDE=y
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CONFIG_IDE_GENERIC=y
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CONFIG_BLK_DEV_IDEPCI=y
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CONFIG_BLK_DEV_GENERIC=y
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CONFIG_BLK_DEV_IDEDMA_PCI=y
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CONFIG_IDEDMA_PCI_AUTO=y
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CONFIG_BLK_DEV_IDE_AU1XXX=y
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CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
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CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128
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CONFIG_BLK_DEV_IDEDMA=y
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CONFIG_IDEDMA_AUTO=y
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Also define 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to enable
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the burst support on DBDMA controller.
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If the used system need the USB support enable the following kernel configs for
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high IDE to USB throughput.
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CONFIG_BLK_DEV_IDEDISK=y
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CONFIG_IDE_GENERIC=y
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CONFIG_BLK_DEV_IDEPCI=y
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CONFIG_BLK_DEV_GENERIC=y
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CONFIG_BLK_DEV_IDEDMA_PCI=y
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CONFIG_IDEDMA_PCI_AUTO=y
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CONFIG_BLK_DEV_IDE_AU1XXX=y
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CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
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CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128
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CONFIG_BLK_DEV_IDEDMA=y
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CONFIG_IDEDMA_AUTO=y
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Also undefine 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to
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disable the burst support on DBDMA controller.
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ADD NEW HARD DISC TO WHITE OR BLACK LIST
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----------------------------------------
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Step 1 : detect the model name of your hard disc
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a) connect your hard disc to the AU1XXX
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b) boot your kernel and get the hard disc model.
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Example boot log:
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--snipped--
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Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
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ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
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Au1xxx IDE(builtin) configured for MWDMA2
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Probing IDE interface ide0...
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hda: Maxtor 6E040L0, ATA DISK drive
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ide0 at 0xac800000-0xac800007,0xac8001c0 on irq 64
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hda: max request size: 64KiB
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hda: 80293248 sectors (41110 MB) w/2048KiB Cache, CHS=65535/16/63, (U)DMA
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--snipped--
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In this example 'Maxtor 6E040L0'.
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Step 2 : edit 'include/asm-mips/mach-au1x00/au1xxx_ide.h'
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Add your hard disc to the dma_white_list or dma_black_list structur.
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Step 3 : Recompile the kernel
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Enable MWDMA support in the kernel configuration. Recompile the kernel and
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reboot.
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Step 4 : Tests
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If you have add a hard disc to the white list, please run some stress tests
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for verification.
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ACKNOWLEDGMENTS
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---------------
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These drivers wouldn't have been done without the base of kernel 2.4.x AU1XXX
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IDE driver from AMD.
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Additional input also from:
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Matthias Lenk <matthias.lenk@amd.com>
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Happy hacking!
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Enrico Walther <enrico.walther@amd.com>
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