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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
4 * Copyright (C) 2007-2009 PetaLogix
5 * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
6 * based on v850 version which was
7 * Copyright (C) 2001,02,03 NEC Electronics Corporation
8 * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
9 */
10
11#ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
12#define _ASM_MICROBLAZE_CACHEFLUSH_H
13
14/* Somebody depends on this; sigh... */
15#include <linux/mm.h>
16#include <linux/io.h>
17
18/* Look at Documentation/core-api/cachetlb.rst */
19
20/*
21 * Cache handling functions.
22 * Microblaze has a write-through data cache, meaning that the data cache
23 * never needs to be flushed. The only flushing operations that are
24 * implemented are to invalidate the instruction cache. These are called
25 * after loading a user application into memory, we must invalidate the
26 * instruction cache to make sure we don't fetch old, bad code.
27 */
28
29/* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
30 * suffix r = range */
31struct scache {
32 /* icache */
33 void (*ie)(void); /* enable */
34 void (*id)(void); /* disable */
35 void (*ifl)(void); /* flush */
36 void (*iflr)(unsigned long a, unsigned long b);
37 void (*iin)(void); /* invalidate */
38 void (*iinr)(unsigned long a, unsigned long b);
39 /* dcache */
40 void (*de)(void); /* enable */
41 void (*dd)(void); /* disable */
42 void (*dfl)(void); /* flush */
43 void (*dflr)(unsigned long a, unsigned long b);
44 void (*din)(void); /* invalidate */
45 void (*dinr)(unsigned long a, unsigned long b);
46};
47
48/* microblaze cache */
49extern struct scache *mbc;
50
51void microblaze_cache_init(void);
52
53#define enable_icache() mbc->ie();
54#define disable_icache() mbc->id();
55#define flush_icache() mbc->ifl();
56#define flush_icache_range(start, end) mbc->iflr(start, end);
57#define invalidate_icache() mbc->iin();
58#define invalidate_icache_range(start, end) mbc->iinr(start, end);
59
60#define flush_icache_user_range(vma, pg, adr, len) flush_icache();
61#define flush_icache_page(vma, pg) do { } while (0)
62
63#define enable_dcache() mbc->de();
64#define disable_dcache() mbc->dd();
65/* FIXME for LL-temac driver */
66#define invalidate_dcache() mbc->din();
67#define invalidate_dcache_range(start, end) mbc->dinr(start, end);
68#define flush_dcache() mbc->dfl();
69#define flush_dcache_range(start, end) mbc->dflr(start, end);
70
71#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
72/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
73#define flush_dcache_page(page) \
74do { \
75 unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
76 addr = (u32)virt_to_phys((void *)addr); \
77 flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
78} while (0);
79
80#define flush_dcache_mmap_lock(mapping) do { } while (0)
81#define flush_dcache_mmap_unlock(mapping) do { } while (0)
82
83#define flush_cache_dup_mm(mm) do { } while (0)
84#define flush_cache_vmap(start, end) do { } while (0)
85#define flush_cache_vunmap(start, end) do { } while (0)
86#define flush_cache_mm(mm) do { } while (0)
87
88#define flush_cache_page(vma, vmaddr, pfn) \
89 flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
90
91/* MS: kgdb code use this macro, wrong len with FLASH */
92#if 0
93#define flush_cache_range(vma, start, len) { \
94 flush_icache_range((unsigned) (start), (unsigned) (start) + (len)); \
95 flush_dcache_range((unsigned) (start), (unsigned) (start) + (len)); \
96}
97#endif
98
99#define flush_cache_range(vma, start, len) do { } while (0)
100
101static inline void copy_to_user_page(struct vm_area_struct *vma,
102 struct page *page, unsigned long vaddr,
103 void *dst, void *src, int len)
104{
105 u32 addr = virt_to_phys(dst);
106 memcpy(dst, src, len);
107 if (vma->vm_flags & VM_EXEC) {
108 invalidate_icache_range(addr, addr + PAGE_SIZE);
109 flush_dcache_range(addr, addr + PAGE_SIZE);
110 }
111}
112
113static inline void copy_from_user_page(struct vm_area_struct *vma,
114 struct page *page, unsigned long vaddr,
115 void *dst, void *src, int len)
116{
117 memcpy(dst, src, len);
118}
119
120#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */