1 files changed, 129 insertions, 0 deletions

diff --git a/include/asm-avr32/cacheflush.h b/include/asm-avr32/cacheflush.h
new file mode 100644
index 000000000000..f1bf1708980e
--- /dev/null
+++ b/include/asm-avr32/cacheflush.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_CACHEFLUSH_H
+#define __ASM_AVR32_CACHEFLUSH_H
+
+/* Keep includes the same across arches.  */
+#include <linux/mm.h>
+
+#define CACHE_OP_ICACHE_INVALIDATE      0x01
+#define CACHE_OP_DCACHE_INVALIDATE      0x0b
+#define CACHE_OP_DCACHE_CLEAN           0x0c
+#define CACHE_OP_DCACHE_CLEAN_INVAL     0x0d
+
+/*
+ * Invalidate any cacheline containing virtual address vaddr without
+ * writing anything back to memory.
+ *
+ * Note that this function may corrupt unrelated data structures when
+ * applied on buffers that are not cacheline aligned in both ends.
+ */
+static inline void invalidate_dcache_line(void *vaddr)
+{
+        asm volatile("cache %0[0], %1"
+                     :
+                     : "r"(vaddr), "n"(CACHE_OP_DCACHE_INVALIDATE)
+                     : "memory");
+}
+
+/*
+ * Make sure any cacheline containing virtual address vaddr is written
+ * to memory.
+ */
+static inline void clean_dcache_line(void *vaddr)
+{
+        asm volatile("cache %0[0], %1"
+                     :
+                     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN)
+                     : "memory");
+}
+
+/*
+ * Make sure any cacheline containing virtual address vaddr is written
+ * to memory and then invalidate it.
+ */
+static inline void flush_dcache_line(void *vaddr)
+{
+        asm volatile("cache %0[0], %1"
+                     :
+                     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN_INVAL)
+                     : "memory");
+}
+
+/*
+ * Invalidate any instruction cacheline containing virtual address
+ * vaddr.
+ */
+static inline void invalidate_icache_line(void *vaddr)
+{
+        asm volatile("cache %0[0], %1"
+                     :
+                     : "r"(vaddr), "n"(CACHE_OP_ICACHE_INVALIDATE)
+                     : "memory");
+}
+
+/*
+ * Applies the above functions on all lines that are touched by the
+ * specified virtual address range.
+ */
+void invalidate_dcache_region(void *start, size_t len);
+void clean_dcache_region(void *start, size_t len);
+void flush_dcache_region(void *start, size_t len);
+void invalidate_icache_region(void *start, size_t len);
+
+/*
+ * Make sure any pending writes are completed before continuing.
+ */
+#define flush_write_buffer() asm volatile("sync 0" : : : "memory")
+
+/*
+ * The following functions are called when a virtual mapping changes.
+ * We do not need to flush anything in this case.
+ */
+#define flush_cache_all()                       do { } while (0)
+#define flush_cache_mm(mm)                      do { } while (0)
+#define flush_cache_range(vma, start, end)      do { } while (0)
+#define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
+#define flush_cache_vmap(start, end)            do { } while (0)
+#define flush_cache_vunmap(start, end)          do { } while (0)
+
+/*
+ * I think we need to implement this one to be able to reliably
+ * execute pages from RAMDISK. However, if we implement the
+ * flush_dcache_*() functions, it might not be needed anymore.
+ *
+ * #define flush_icache_page(vma, page)         do { } while (0)
+ */
+extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
+
+/*
+ * These are (I think) related to D-cache aliasing.  We might need to
+ * do something here, but only for certain configurations.  No such
+ * configurations exist at this time.
+ */
+#define flush_dcache_page(page)                 do { } while (0)
+#define flush_dcache_mmap_lock(page)            do { } while (0)
+#define flush_dcache_mmap_unlock(page)          do { } while (0)
+
+/*
+ * These are for I/D cache coherency. In this case, we do need to
+ * flush with all configurations.
+ */
+extern void flush_icache_range(unsigned long start, unsigned long end);
+extern void flush_icache_user_range(struct vm_area_struct *vma,
+                                    struct page *page,
+                                    unsigned long addr, int len);
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) do { \
+        memcpy(dst, src, len);                                  \
+        flush_icache_user_range(vma, page, vaddr, len);         \
+} while(0)
+#define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
+        memcpy(dst, src, len)
+
+#endif /* __ASM_AVR32_CACHEFLUSH_H */