1/*
  2 * Copyright (C) 2004-2006 Atmel Corporation
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License version 2 as
  6 * published by the Free Software Foundation.
  7 */
  8#ifndef __ASM_AVR32_CACHEFLUSH_H
  9#define __ASM_AVR32_CACHEFLUSH_H
 10
 11/* Keep includes the same across arches.  */
 12#include <linux/mm.h>
 13
 14#define CACHE_OP_ICACHE_INVALIDATE	0x01
 15#define CACHE_OP_DCACHE_INVALIDATE	0x0b
 16#define CACHE_OP_DCACHE_CLEAN		0x0c
 17#define CACHE_OP_DCACHE_CLEAN_INVAL	0x0d
 18
 19/*
 20 * Invalidate any cacheline containing virtual address vaddr without
 21 * writing anything back to memory.
 22 *
 23 * Note that this function may corrupt unrelated data structures when
 24 * applied on buffers that are not cacheline aligned in both ends.
 25 */
 26static inline void invalidate_dcache_line(void *vaddr)
 27{
 28	asm volatile("cache %0[0], %1"
 29		     :
 30		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_INVALIDATE)
 31		     : "memory");
 32}
 33
 34/*
 35 * Make sure any cacheline containing virtual address vaddr is written
 36 * to memory.
 37 */
 38static inline void clean_dcache_line(void *vaddr)
 39{
 40	asm volatile("cache %0[0], %1"
 41		     :
 42		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN)
 43		     : "memory");
 44}
 45
 46/*
 47 * Make sure any cacheline containing virtual address vaddr is written
 48 * to memory and then invalidate it.
 49 */
 50static inline void flush_dcache_line(void *vaddr)
 51{
 52	asm volatile("cache %0[0], %1"
 53		     :
 54		     : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN_INVAL)
 55		     : "memory");
 56}
 57
 58/*
 59 * Invalidate any instruction cacheline containing virtual address
 60 * vaddr.
 61 */
 62static inline void invalidate_icache_line(void *vaddr)
 63{
 64	asm volatile("cache %0[0], %1"
 65		     :
 66		     : "r"(vaddr), "n"(CACHE_OP_ICACHE_INVALIDATE)
 67		     : "memory");
 68}
 69
 70/*
 71 * Applies the above functions on all lines that are touched by the
 72 * specified virtual address range.
 73 */
 74void invalidate_dcache_region(void *start, size_t len);
 75void clean_dcache_region(void *start, size_t len);
 76void flush_dcache_region(void *start, size_t len);
 77void invalidate_icache_region(void *start, size_t len);
 78
 79/*
 80 * Make sure any pending writes are completed before continuing.
 81 */
 82#define flush_write_buffer() asm volatile("sync 0" : : : "memory")
 83
 84/*
 85 * The following functions are called when a virtual mapping changes.
 86 * We do not need to flush anything in this case.
 87 */
 88#define flush_cache_all()			do { } while (0)
 89#define flush_cache_mm(mm)			do { } while (0)
 90#define flush_cache_dup_mm(mm)			do { } while (0)
 91#define flush_cache_range(vma, start, end)	do { } while (0)
 92#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)
 93#define flush_cache_vmap(start, end)		do { } while (0)
 94#define flush_cache_vunmap(start, end)		do { } while (0)
 95
 96/*
 97 * I think we need to implement this one to be able to reliably
 98 * execute pages from RAMDISK. However, if we implement the
 99 * flush_dcache_*() functions, it might not be needed anymore.
100 *
101 * #define flush_icache_page(vma, page)		do { } while (0)
102 */
103extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
104
105/*
106 * These are (I think) related to D-cache aliasing.  We might need to
107 * do something here, but only for certain configurations.  No such
108 * configurations exist at this time.
109 */
110#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
111#define flush_dcache_page(page)			do { } while (0)
112#define flush_dcache_mmap_lock(page)		do { } while (0)
113#define flush_dcache_mmap_unlock(page)		do { } while (0)
114
115/*
116 * These are for I/D cache coherency. In this case, we do need to
117 * flush with all configurations.
118 */
119extern void flush_icache_range(unsigned long start, unsigned long end);
120
121extern void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
122		unsigned long vaddr, void *dst, const void *src,
123		unsigned long len);
124
125static inline void copy_from_user_page(struct vm_area_struct *vma,
126		struct page *page, unsigned long vaddr, void *dst,
127		const void *src, unsigned long len)
128{
129	memcpy(dst, src, len);
130}
131
132#endif /* __ASM_AVR32_CACHEFLUSH_H */