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authorTrent Piepho <tpiepho@freescale.com>2008-12-17 11:43:26 -0800
committerKumar Gala <galak@kernel.crashing.org>2009-01-07 15:33:05 -0600
commit565f37642c78754a85efe6c20a4a15e18ed21f07 (patch)
tree59d91974af64223e2891cddfe9ce2e58ada8109d
parenta097a78c1e6e4030fcef3bcab6351b6001662335 (diff)
downloadblackbird-op-linux-565f37642c78754a85efe6c20a4a15e18ed21f07.tar.gz
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powerpc/fsl-pci: Set relaxed ordering on prefetchable ranges
Provides a small speedup when accessing pefetchable ranges. To indicate that a memory range is prefetchable, mark it in the dts file with 42000000 instead of 02000000. A powepc pci_controller is allowed three memory ranges, any of which may be prefetchable. However, the PCI-PCI bridge configuration space only has one field for "non-prefetchable memory behind bridge", which has a 32 bit address, and one field for "prefetchable memory behind bridge", which may have a 64 bit address. These are PCI bus addresses, not CPU physical addresses. So really you're only allowed one memory range of each type. And if you want the range at a PCI address above 32 bits you must make it prefetchable. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
-rw-r--r--arch/powerpc/sysdev/fsl_pci.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 44bc903ead74..9817f63723dd 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -41,6 +41,9 @@ static int __init setup_one_atmu(struct ccsr_pci __iomem *pci,
pr_debug("PCI MEM resource start 0x%016llx, size 0x%016llx.\n",
(u64)res->start, (u64)size);
+ if (res->flags & IORESOURCE_PREFETCH)
+ flags |= 0x10000000; /* enable relaxed ordering */
+
for (i = 0; size > 0; i++) {
unsigned int bits = min(__ilog2(size),
__ffs(pci_addr | phys_addr));
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