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authorPete Popov <ppopov@embeddedalley.com>2005-09-15 08:03:12 (GMT)
committerRalf Baechle <ralf@linux-mips.org>2005-10-29 18:32:20 (GMT)
commit26a940e21752e0de8f068f77dad606a7d1986937 (patch)
tree88e46225e19c4c72fa6914a21afb28c6ea52bfc6 /Documentation/mips
parent64abf64d10b3a547becefeb26394dfbefac273fb (diff)
Cleaned up AMD Au1200 IDE driver:
- converted to platform bus - removed pci dependencies - removed virt_to_phys/phys_to_virt calls System now can root off of a disk. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> diff --git a/Documentation/mips/AU1xxx_IDE.README b/Documentation/mips/AU1xxx_IDE.README new file mode 100644
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diff --git a/Documentation/mips/AU1xxx_IDE.README b/Documentation/mips/AU1xxx_IDE.README
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+README for MIPS AU1XXX IDE driver - Released 2005-07-15
+
+ABOUT
+-----
+This file describes the 'drivers/ide/mips/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.
+
+
+LICENSE
+-------
+
+Copyright (c) 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.
+
+
+FILES, CONFIGS AND COMPATABILITY
+--------------------------------
+
+Two files are introduced:
+
+ a) 'include/asm-mips/mach-au1x00/au1xxx_ide.h'
+ containes : struct _auide_hwif
+ struct drive_list_entry dma_white_list
+ struct drive_list_entry dma_black_list
+ timing parameters for PIO mode 0/1/2/3/4
+ timing parameters for MWDMA 0/1/2
+
+ b) 'drivers/ide/mips/au1xxx-ide.c'
+ contains the functionality of the AU1XXX IDE driver
+
+Four 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
+ CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON - set Burstable FIFO in DBDMA
+ controler
+ CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ - maximum transfer size
+ per descriptor
+
+If MWDMA is enabled and the connected hard disc is not on the white list, the
+kernel switches to a "safe mwdma mode" at boot time. In this mode the IDE
+performance is substantial slower then in full speed mwdma. In this case
+please add your hard disc to the white list (follow instruction from 'ADD NEW
+HARD DISC TO WHITE OR BLACK LIST' section).
+
+
+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.
+
+
+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_IDEDMA_PCI_AUTO=y
+CONFIG_BLK_DEV_IDE_AU1XXX=y
+CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
+CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON=y
+CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128
+CONFIG_BLK_DEV_IDEDMA=y
+CONFIG_IDEDMA_AUTO=y
+
+If the used system need the USB support enable the following kernel configs for
+high IDE to USB throughput.
+
+CONFIG_BLK_DEV_IDEDISK=y
+CONFIG_IDE_GENERIC=y
+CONFIG_BLK_DEV_IDEPCI=y
+CONFIG_BLK_DEV_GENERIC=y
+CONFIG_BLK_DEV_IDEDMA_PCI=y
+CONFIG_IDEDMA_PCI_AUTO=y
+CONFIG_BLK_DEV_IDE_AU1XXX=y
+CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
+CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128
+CONFIG_BLK_DEV_IDEDMA=y
+CONFIG_IDEDMA_AUTO=y
+
+
+ADD NEW HARD DISC TO WHITE OR BLACK LIST
+----------------------------------------
+
+Step 1 : detect the model name of your hard disc
+
+ a) connect your hard disc to the AU1XXX
+
+ b) boot your kernel and get the hard disc model.
+
+ Example boot log:
+
+ --snipped--
+ Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
+ ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
+ Au1xxx IDE(builtin) configured for MWDMA2
+ Probing IDE interface ide0...
+ hda: Maxtor 6E040L0, ATA DISK drive
+ ide0 at 0xac800000-0xac800007,0xac8001c0 on irq 64
+ hda: max request size: 64KiB
+ hda: 80293248 sectors (41110 MB) w/2048KiB Cache, CHS=65535/16/63, (U)DMA
+ --snipped--
+
+ In this example 'Maxtor 6E040L0'.
+
+Step 2 : edit 'include/asm-mips/mach-au1x00/au1xxx_ide.h'
+
+ Add your hard disc to the dma_white_list or dma_black_list structur.
+
+Step 3 : Recompile the kernel
+
+ Enable MWDMA support in the kernel configuration. Recompile the kernel and
+ reboot.
+
+Step 4 : Tests
+
+ If you have add a hard disc to the white list, please run some stress tests
+ for verification.
+
+
+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>

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