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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2016 Vladimir Zapolskiy <vz@mleia.com>
4  * (C) Copyright 2007 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
5  */
6
7 #include <common.h>
8 #include <command.h>
9 #include <asm/io.h>
10 #include <asm/processor.h>
11 #include <asm/system.h>
12
13 #define CACHE_VALID       1
14 #define CACHE_UPDATED     2
15
16 static inline void cache_wback_all(void)
17 {
18         unsigned long addr, data, i, j;
19
20         for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++) {
21                 for (j = 0; j < CACHE_OC_NUM_WAYS; j++) {
22                         addr = CACHE_OC_ADDRESS_ARRAY
23                                 | (j << CACHE_OC_WAY_SHIFT)
24                                 | (i << CACHE_OC_ENTRY_SHIFT);
25                         data = inl(addr);
26                         if (data & CACHE_UPDATED) {
27                                 data &= ~CACHE_UPDATED;
28                                 outl(data, addr);
29                         }
30                 }
31         }
32 }
33
34 #define CACHE_ENABLE      0
35 #define CACHE_DISABLE     1
36
37 static int cache_control(unsigned int cmd)
38 {
39         unsigned long ccr;
40
41         jump_to_P2();
42         ccr = inl(CCR);
43
44         if (ccr & CCR_CACHE_ENABLE)
45                 cache_wback_all();
46
47         if (cmd == CACHE_DISABLE)
48                 outl(CCR_CACHE_STOP, CCR);
49         else
50                 outl(CCR_CACHE_INIT, CCR);
51         back_to_P1();
52
53         return 0;
54 }
55
56 void flush_dcache_range(unsigned long start, unsigned long end)
57 {
58         u32 v;
59
60         start &= ~(L1_CACHE_BYTES - 1);
61         for (v = start; v < end; v += L1_CACHE_BYTES) {
62                 asm volatile ("ocbp     %0" :   /* no output */
63                               : "m" (__m(v)));
64         }
65 }
66
67 void invalidate_dcache_range(unsigned long start, unsigned long end)
68 {
69         u32 v;
70
71         start &= ~(L1_CACHE_BYTES - 1);
72         for (v = start; v < end; v += L1_CACHE_BYTES) {
73                 asm volatile ("ocbi     %0" :   /* no output */
74                               : "m" (__m(v)));
75         }
76 }
77
78 void flush_cache(unsigned long addr, unsigned long size)
79 {
80         flush_dcache_range(addr , addr + size);
81 }
82
83 void icache_enable(void)
84 {
85         cache_control(CACHE_ENABLE);
86 }
87
88 void icache_disable(void)
89 {
90         cache_control(CACHE_DISABLE);
91 }
92
93 int icache_status(void)
94 {
95         return 0;
96 }
97
98 void dcache_enable(void)
99 {
100 }
101
102 void dcache_disable(void)
103 {
104 }
105
106 int dcache_status(void)
107 {
108         return 0;
109 }