1/*
2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
5 * based on v850 version which was
6 * Copyright (C) 2001,02,03 NEC Electronics Corporation
7 * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
8 *
9 * This file is subject to the terms and conditions of the GNU General
10 * Public License. See the file COPYING in the main directory of this
11 * archive for more details.
12 *
13 */
14
15#ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
16#define _ASM_MICROBLAZE_CACHEFLUSH_H
17
18/* Somebody depends on this; sigh... */
19#include <linux/mm.h>
20#include <linux/io.h>
21
22/* Look at Documentation/cachetlb.txt */
23
24/*
25 * Cache handling functions.
26 * Microblaze has a write-through data cache, meaning that the data cache
27 * never needs to be flushed.  The only flushing operations that are
28 * implemented are to invalidate the instruction cache.  These are called
29 * after loading a user application into memory, we must invalidate the
30 * instruction cache to make sure we don't fetch old, bad code.
31 */
32
33/* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
34 * suffix r = range */
35struct scache {
36	/* icache */
37	void (*ie)(void); /* enable */
38	void (*id)(void); /* disable */
39	void (*ifl)(void); /* flush */
40	void (*iflr)(unsigned long a, unsigned long b);
41	void (*iin)(void); /* invalidate */
42	void (*iinr)(unsigned long a, unsigned long b);
43	/* dcache */
44	void (*de)(void); /* enable */
45	void (*dd)(void); /* disable */
46	void (*dfl)(void); /* flush */
47	void (*dflr)(unsigned long a, unsigned long b);
48	void (*din)(void); /* invalidate */
49	void (*dinr)(unsigned long a, unsigned long b);
50};
51
52/* microblaze cache */
53extern struct scache *mbc;
54
55void microblaze_cache_init(void);
56
57#define enable_icache()					mbc->ie();
58#define disable_icache()				mbc->id();
59#define flush_icache()					mbc->ifl();
60#define flush_icache_range(start, end)			mbc->iflr(start, end);
61#define invalidate_icache()				mbc->iin();
62#define invalidate_icache_range(start, end)		mbc->iinr(start, end);
63
64#define flush_icache_user_range(vma, pg, adr, len)	flush_icache();
65#define flush_icache_page(vma, pg)			do { } while (0)
66
67#define enable_dcache()					mbc->de();
68#define disable_dcache()				mbc->dd();
69/* FIXME for LL-temac driver */
70#define invalidate_dcache()				mbc->din();
71#define invalidate_dcache_range(start, end)		mbc->dinr(start, end);
72#define flush_dcache()					mbc->dfl();
73#define flush_dcache_range(start, end)			mbc->dflr(start, end);
74
75#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
76/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
77#define flush_dcache_page(page) \
78do { \
79	unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
80	addr = (u32)virt_to_phys((void *)addr); \
81	flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
82} while (0);
83
84#define flush_dcache_mmap_lock(mapping)		do { } while (0)
85#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
86
87#define flush_cache_dup_mm(mm)				do { } while (0)
88#define flush_cache_vmap(start, end)			do { } while (0)
89#define flush_cache_vunmap(start, end)			do { } while (0)
90#define flush_cache_mm(mm)			do { } while (0)
91
92#define flush_cache_page(vma, vmaddr, pfn) \
93	flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
94
95/* MS: kgdb code use this macro, wrong len with FLASH */
96#if 0
97#define flush_cache_range(vma, start, len)	{	\
98	flush_icache_range((unsigned) (start), (unsigned) (start) + (len)); \
99	flush_dcache_range((unsigned) (start), (unsigned) (start) + (len)); \
100}
101#endif
102
103#define flush_cache_range(vma, start, len) do { } while (0)
104
105static inline void copy_to_user_page(struct vm_area_struct *vma,
106				     struct page *page, unsigned long vaddr,
107				     void *dst, void *src, int len)
108{
109	u32 addr = virt_to_phys(dst);
110	memcpy(dst, src, len);
111	if (vma->vm_flags & VM_EXEC) {
112		invalidate_icache_range(addr, addr + PAGE_SIZE);
113		flush_dcache_range(addr, addr + PAGE_SIZE);
114	}
115}
116
117static inline void copy_from_user_page(struct vm_area_struct *vma,
118				       struct page *page, unsigned long vaddr,
119				       void *dst, void *src, int len)
120{
121	memcpy(dst, src, len);
122}
123
124#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */
125