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 */
31 struct 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 */
49 extern struct scache *mbc;
50
51 void 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 enable_dcache() mbc->de();
61 #define disable_dcache() mbc->dd();
62 /* FIXME for LL-temac driver */
63 #define invalidate_dcache() mbc->din();
64 #define invalidate_dcache_range(start, end) mbc->dinr(start, end);
65 #define flush_dcache() mbc->dfl();
66 #define flush_dcache_range(start, end) mbc->dflr(start, end);
67
68 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
69 /* MS: We have to implement it because of rootfs-jffs2 issue on WB */
70 #define flush_dcache_page(page) \
71 do { \
72 unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
73 addr = (u32)virt_to_phys((void *)addr); \
74 flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
75 } while (0);
76
77 static inline void flush_dcache_folio(struct folio *folio)
78 {
79 unsigned long addr = folio_pfn(folio) << PAGE_SHIFT;
80
81 flush_dcache_range(addr, addr + folio_size(folio));
82 }
83 #define flush_dcache_folio flush_dcache_folio
84
85 #define flush_cache_page(vma, vmaddr, pfn) \
86 flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
87
88 static inline void copy_to_user_page(struct vm_area_struct *vma,
89 struct page *page, unsigned long vaddr,
90 void *dst, void *src, int len)
91 {
92 u32 addr = virt_to_phys(dst);
93 memcpy(dst, src, len);
94 if (vma->vm_flags & VM_EXEC) {
95 invalidate_icache_range(addr, addr + PAGE_SIZE);
96 flush_dcache_range(addr, addr + PAGE_SIZE);
97 }
98 }
99 #define copy_to_user_page copy_to_user_page
100
101 #include <asm-generic/cacheflush.h>
102
103 #endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */
104
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