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 */
35 struct 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 */
53 extern struct scache *mbc;
54 
55 void 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) \
78 do { \
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 
105 static 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 
117 static 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