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authorAlessandro Zummo <azummo-armlinux@towertech.it>2005-11-06 14:34:12 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-06 14:34:12 +0000
commit84613387cb60bc760a4588822cd61fb88e1d7fad (patch)
tree66f945e84fe66dafa5fb897223588353aed48860 /arch/arm/mach-ixp4xx
parent8459c159f7de832eaf888398d2abf466c388dfa6 (diff)
downloadblackbird-op-linux-84613387cb60bc760a4588822cd61fb88e1d7fad.tar.gz
blackbird-op-linux-84613387cb60bc760a4588822cd61fb88e1d7fad.zip
[ARM] 3089/1: ixp4xx AHB/PCI endianness fix
Patch from Alessandro Zummo This patch fixes AHB/PCI endianness problems when the processor is in little-endian mode. The patch configures the CSR register closely following the directives in [1], paragraph 4.1, page 19. According to the considerations in [1], page 11, while the AHB bus supports both endian modes, on the IXP4XX it always uses big-endian. The PCI bus is connected to the South AHB. A wrong setting in the CSR register will thus cause a malfunctional PCI bus. A schematic diagram of the bus interconnections on the IXP4XX can be found in [1], page 18. The patch has been verified to work on the NSLU2 in both LE and BE modes. The author is Peter Korsgaard. [1] Intel® IXP4XX Product Line of Network Processors and IXC1100 Control Plane Processor: Understanding Big Endian and Little Endian Modes http://www.intel.com/design/network/applnots/25423701.pdf Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-ixp4xx')
-rw-r--r--arch/arm/mach-ixp4xx/common-pci.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
index 2b544363c078..9795da270e3a 100644
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ b/arch/arm/mach-ixp4xx/common-pci.c
@@ -427,7 +427,7 @@ void __init ixp4xx_pci_preinit(void)
#ifdef __ARMEB__
*PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE | PCI_CSR_PDS | PCI_CSR_ADS;
#else
- *PCI_CSR = PCI_CSR_IC;
+ *PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE;
#endif
pr_debug("DONE\n");
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