1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/mm.h>
3 #include <asm/mmu_context.h>
4 #include <asm/cache_insns.h>
5 #include <asm/cacheflush.h>
6 #include <asm/traps.h>
7
8 /*
9 * Write back the dirty D-caches, but not invalidate them.
10 *
11 * START: Virtual Address (U0, P1, or P3)
12 * SIZE: Size of the region.
13 */
14 static void sh4__flush_wback_region(void *start, int size)
15 {
16 reg_size_t aligned_start, v, cnt, end;
17
18 aligned_start = register_align(start);
19 v = aligned_start & ~(L1_CACHE_BYTES-1);
20 end = (aligned_start + size + L1_CACHE_BYTES-1)
21 & ~(L1_CACHE_BYTES-1);
22 cnt = (end - v) / L1_CACHE_BYTES;
23
24 while (cnt >= 8) {
25 __ocbwb(v); v += L1_CACHE_BYTES;
26 __ocbwb(v); v += L1_CACHE_BYTES;
27 __ocbwb(v); v += L1_CACHE_BYTES;
28 __ocbwb(v); v += L1_CACHE_BYTES;
29 __ocbwb(v); v += L1_CACHE_BYTES;
30 __ocbwb(v); v += L1_CACHE_BYTES;
31 __ocbwb(v); v += L1_CACHE_BYTES;
32 __ocbwb(v); v += L1_CACHE_BYTES;
33 cnt -= 8;
34 }
35
36 while (cnt) {
37 __ocbwb(v); v += L1_CACHE_BYTES;
38 cnt--;
39 }
40 }
41
42 /*
43 * Write back the dirty D-caches and invalidate them.
44 *
45 * START: Virtual Address (U0, P1, or P3)
46 * SIZE: Size of the region.
47 */
48 static void sh4__flush_purge_region(void *start, int size)
49 {
50 reg_size_t aligned_start, v, cnt, end;
51
52 aligned_start = register_align(start);
53 v = aligned_start & ~(L1_CACHE_BYTES-1);
54 end = (aligned_start + size + L1_CACHE_BYTES-1)
55 & ~(L1_CACHE_BYTES-1);
56 cnt = (end - v) / L1_CACHE_BYTES;
57
58 while (cnt >= 8) {
59 __ocbp(v); v += L1_CACHE_BYTES;
60 __ocbp(v); v += L1_CACHE_BYTES;
61 __ocbp(v); v += L1_CACHE_BYTES;
62 __ocbp(v); v += L1_CACHE_BYTES;
63 __ocbp(v); v += L1_CACHE_BYTES;
64 __ocbp(v); v += L1_CACHE_BYTES;
65 __ocbp(v); v += L1_CACHE_BYTES;
66 __ocbp(v); v += L1_CACHE_BYTES;
67 cnt -= 8;
68 }
69 while (cnt) {
70 __ocbp(v); v += L1_CACHE_BYTES;
71 cnt--;
72 }
73 }
74
75 /*
76 * No write back please
77 */
78 static void sh4__flush_invalidate_region(void *start, int size)
79 {
80 reg_size_t aligned_start, v, cnt, end;
81
82 aligned_start = register_align(start);
83 v = aligned_start & ~(L1_CACHE_BYTES-1);
84 end = (aligned_start + size + L1_CACHE_BYTES-1)
85 & ~(L1_CACHE_BYTES-1);
86 cnt = (end - v) / L1_CACHE_BYTES;
87
88 while (cnt >= 8) {
89 __ocbi(v); v += L1_CACHE_BYTES;
90 __ocbi(v); v += L1_CACHE_BYTES;
91 __ocbi(v); v += L1_CACHE_BYTES;
92 __ocbi(v); v += L1_CACHE_BYTES;
93 __ocbi(v); v += L1_CACHE_BYTES;
94 __ocbi(v); v += L1_CACHE_BYTES;
95 __ocbi(v); v += L1_CACHE_BYTES;
96 __ocbi(v); v += L1_CACHE_BYTES;
97 cnt -= 8;
98 }
99
100 while (cnt) {
101 __ocbi(v); v += L1_CACHE_BYTES;
102 cnt--;
103 }
104 }
105
106 void __init sh4__flush_region_init(void)
107 {
108 __flush_wback_region = sh4__flush_wback_region;
109 __flush_invalidate_region = sh4__flush_invalidate_region;
110 __flush_purge_region = sh4__flush_purge_region;
111 }
112
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