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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-12-13 12:56:33 +0100
committerStefan Roese <sr@denx.de>2007-12-13 13:15:16 +0100
commit4d7d6936eb29af7cca330937808312aa5f61454d (patch)
treeb376f7dce492d171cf6740ac4ec36574e94eec1e /include/asm-arm
parentcdbaefb5f5f03e54455d0439dcf6dbd97ead1f9d (diff)
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Introduce map_physmem() and unmap_physmem()
map_physmem() returns a virtual address which can be used to access a given physical address without involving the cache. unmap_physmem() should be called when the virtual address returned by map_physmem() is no longer needed. This patch adds a stub implementation which simply returns the physical address cast to a uchar * for all architectures except AVR32, which converts the physical address to an uncached virtual mapping. unmap_physmem() is a no-op on all architectures, but if any architecture needs to do such mappings through the TLB, this is the hook where those TLB entries can be invalidated. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/io.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-arm/io.h b/include/asm-arm/io.h
index 47c18e7..029b7f9 100644
--- a/include/asm-arm/io.h
+++ b/include/asm-arm/io.h
@@ -34,6 +34,32 @@ static inline void sync(void)
}
/*
+ * Given a physical address and a length, return a virtual address
+ * that can be used to access the memory range with the caching
+ * properties specified by "flags".
+ */
+typedef unsigned long phys_addr_t;
+
+#define MAP_NOCACHE (0)
+#define MAP_WRCOMBINE (0)
+#define MAP_WRBACK (0)
+#define MAP_WRTHROUGH (0)
+
+static inline void *
+map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
+{
+ return (void *)paddr;
+}
+
+/*
+ * Take down a mapping set up by map_physmem().
+ */
+static inline void unmap_physmem(void *vaddr, unsigned long flags)
+{
+
+}
+
+/*
* Generic virtual read/write. Note that we don't support half-word
* read/writes. We define __arch_*[bl] here, and leave __arch_*w
* to the architecture specific code.