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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-11-09 11:18:36 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-11-09 11:18:36 +0000
commitebb4c65869db7213280ad9c510637683939b5ff8 (patch)
treee9aa372c806fad73a04ba2f9d16d1f17491a11cf /arch/arm/plat-iop
parent7bfc0b2e266dd4cd3d3f27a3ad31bf79974190b1 (diff)
downloadop-kernel-dev-ebb4c65869db7213280ad9c510637683939b5ff8.zip
op-kernel-dev-ebb4c65869db7213280ad9c510637683939b5ff8.tar.gz
[ARM] iop: iop3xx needs registers mapped uncached+unbuffered
Mikael Pettersson reported: The 2.6.28-rc kernels fail to detect PCI device 0000:00:01.0 (the first ethernet port) on my Thecus n2100 XScale box. There is however still a strange "ghost" device that gets partially detected in 2.6.28-rc2 vanilla. The IOP321 manual says: The user designates the memory region containing the OCCDR as non-cacheable and non-bufferable from the IntelR XScaleTM core. This guarantees that all load/stores to the OCCDR are only of DWORD quantities. Ensure that the OCCDR is so mapped. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-iop')
-rw-r--r--arch/arm/plat-iop/setup.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm/plat-iop/setup.c b/arch/arm/plat-iop/setup.c
index 4689db6..9e573e7 100644
--- a/arch/arm/plat-iop/setup.c
+++ b/arch/arm/plat-iop/setup.c
@@ -16,14 +16,15 @@
#include <asm/hardware/iop3xx.h>
/*
- * Standard IO mapping for all IOP3xx based systems
+ * Standard IO mapping for all IOP3xx based systems. Note that
+ * the IOP3xx OCCDR must be mapped uncached and unbuffered.
*/
static struct map_desc iop3xx_std_desc[] __initdata = {
{ /* mem mapped registers */
.virtual = IOP3XX_PERIPHERAL_VIRT_BASE,
.pfn = __phys_to_pfn(IOP3XX_PERIPHERAL_PHYS_BASE),
.length = IOP3XX_PERIPHERAL_SIZE,
- .type = MT_DEVICE,
+ .type = MT_UNCACHED,
}, { /* PCI IO space */
.virtual = IOP3XX_PCI_LOWER_IO_VA,
.pfn = __phys_to_pfn(IOP3XX_PCI_LOWER_IO_PA),
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