The current NiosII f-core supports write-back data cache. This patch
adds uncached mapping with address bit 31 setting to bypass data cache.
Signed-off-by: Thomas Chou <[EMAIL PROTECTED]>
---
linux-2.6.x/arch/nios2nommu/mm/ioremap.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/linux-2.6.x/arch/nios2nommu/mm/ioremap.c
b/linux-2.6.x/arch/nios2nommu/mm/ioremap.c
index 1c8b172..c1c7829 100644
--- a/linux-2.6.x/arch/nios2nommu/mm/ioremap.c
+++ b/linux-2.6.x/arch/nios2nommu/mm/ioremap.c
@@ -39,12 +39,13 @@
#include <asm/system.h>
/*
- * Map some physical address range into the kernel address space.
+ * Map some physical address range into the cached or uncached kernel address
space.
*/
void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
{
- return (void *)physaddr;
+ return (cacheflag == IOMAP_FULL_CACHING) ? (void *)(physaddr &
~0x80000000) :
+ (void *)(physaddr | 0x80000000);
}
/*
--
1.5.3.3
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