[ARM] 4057/1: ixp23xx: unconditionally enable hardware coherency

On ixp23xx, it was thought to be necessary to disable coherency to work
around certain silicon errata.  This turns out not to be the case --
none of the documented errata workarounds require disabling coherency,
and disabling coherency does not work around any existing errata.

Furthermore, all ixp23xx models do support coherency, so we should just
unconditionally enable coherency for all ixp23xx.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/include/asm-arm/arch-ixp23xx/memory.h b/include/asm-arm/arch-ixp23xx/memory.h
index c85fc06a043c10dc00392d72b3ef726aa40eece9..6d859d742d7f5e405c705a46d4182448ffbad434 100644 (file)
--- a/include/asm-arm/arch-ixp23xx/memory.h
+++ b/include/asm-arm/arch-ixp23xx/memory.h
@@ -41,21 +41,7 @@
        data = *((volatile int *)IXP23XX_PCI_SDRAM_BAR);                \
         __phys_to_virt((((b - (data & 0xfffffff0)) + 0x00000000))); })
 
-/*
- * Coherency support.  Only supported on A2 CPUs or on A1
- * systems that have the cache coherency workaround.
- */
-static inline int __ixp23xx_arch_is_coherent(void)
-{
-       extern unsigned int processor_id;
-
-       if (((processor_id & 15) >= 4) || machine_is_roadrunner())
-               return 1;
-
-       return 0;
-}
-
-#define arch_is_coherent()     __ixp23xx_arch_is_coherent()
+#define arch_is_coherent()     1
 
 #endif