1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4 #include <linux/spinlock.h>
5 #include <asm/cache.h>
6 #include <abi/reg_ops.h>
7
8 /* for L1-cache */
9 #define INS_CACHE (1 << 0)
10 #define DATA_CACHE (1 << 1)
11 #define CACHE_INV (1 << 4)
12 #define CACHE_CLR (1 << 5)
13 #define CACHE_OMS (1 << 6)
14 #define CACHE_ITS (1 << 7)
15 #define CACHE_LICF (1 << 31)
16
17 /* for L2-cache */
18 #define CR22_LEVEL_SHIFT (1)
19 #define CR22_SET_SHIFT (7)
20 #define CR22_WAY_SHIFT (30)
21 #define CR22_WAY_SHIFT_L2 (29)
22
23 static DEFINE_SPINLOCK(cache_lock);
24
25 static inline void cache_op_line(unsigned long i, unsigned int val)
26 {
27 mtcr("cr22", i);
28 mtcr("cr17", val);
29 }
30
31 #define CCR2_L2E (1 << 3)
32 static void cache_op_all(unsigned int value, unsigned int l2)
33 {
34 mtcr("cr17", value | CACHE_CLR);
35 mb();
36
37 if (l2 && (mfcr_ccr2() & CCR2_L2E)) {
38 mtcr("cr24", value | CACHE_CLR);
39 mb();
40 }
41 }
42
43 static void cache_op_range(
44 unsigned int start,
45 unsigned int end,
46 unsigned int value,
47 unsigned int l2)
48 {
49 unsigned long i, flags;
50 unsigned int val = value | CACHE_CLR | CACHE_OMS;
51 bool l2_sync;
52
53 if (unlikely((end - start) >= PAGE_SIZE) ||
54 unlikely(start < PAGE_OFFSET) ||
55 unlikely(start >= PAGE_OFFSET + LOWMEM_LIMIT)) {
56 cache_op_all(value, l2);
57 return;
58 }
59
60 if ((mfcr_ccr2() & CCR2_L2E) && l2)
61 l2_sync = 1;
62 else
63 l2_sync = 0;
64
65 spin_lock_irqsave(&cache_lock, flags);
66
67 i = start & ~(L1_CACHE_BYTES - 1);
68 for (; i < end; i += L1_CACHE_BYTES) {
69 cache_op_line(i, val);
70 if (l2_sync) {
71 mb();
72 mtcr("cr24", val);
73 }
74 }
75 spin_unlock_irqrestore(&cache_lock, flags);
76
77 mb();
78 }
79
80 void dcache_wb_line(unsigned long start)
81 {
82 asm volatile("idly4\n":::"memory");
83 cache_op_line(start, DATA_CACHE|CACHE_CLR);
84 mb();
85 }
86
87 void icache_inv_range(unsigned long start, unsigned long end)
88 {
89 cache_op_range(start, end, INS_CACHE|CACHE_INV, 0);
90 }
91
92 void icache_inv_all(void)
93 {
94 cache_op_all(INS_CACHE|CACHE_INV, 0);
95 }
96
97 void local_icache_inv_all(void *priv)
98 {
99 cache_op_all(INS_CACHE|CACHE_INV, 0);
100 }
101
102 void dcache_wb_range(unsigned long start, unsigned long end)
103 {
104 cache_op_range(start, end, DATA_CACHE|CACHE_CLR, 0);
105 }
106
107 void dcache_wbinv_all(void)
108 {
109 cache_op_all(DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
110 }
111
112 void cache_wbinv_range(unsigned long start, unsigned long end)
113 {
114 cache_op_range(start, end, INS_CACHE|DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
115 }
116 EXPORT_SYMBOL(cache_wbinv_range);
117
118 void cache_wbinv_all(void)
119 {
120 cache_op_all(INS_CACHE|DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
121 }
122
123 void dma_wbinv_range(unsigned long start, unsigned long end)
124 {
125 cache_op_range(start, end, DATA_CACHE|CACHE_CLR|CACHE_INV, 1);
126 }
127
128 void dma_inv_range(unsigned long start, unsigned long end)
129 {
130 cache_op_range(start, end, DATA_CACHE|CACHE_CLR|CACHE_INV, 1);
131 }
132
133 void dma_wb_range(unsigned long start, unsigned long end)
134 {
135 cache_op_range(start, end, DATA_CACHE|CACHE_CLR|CACHE_INV, 1);
136 }
137
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