cache-sh2a.c
4.62 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*
* arch/sh/mm/cache-sh2a.c
*
* Copyright (C) 2008 Yoshinori Sato
*
* Released under the terms of the GNU GPL v2.0.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/cache.h>
#include <asm/addrspace.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
/*
* The maximum number of pages we support up to when doing ranged dcache
* flushing. Anything exceeding this will simply flush the dcache in its
* entirety.
*/
#define MAX_OCACHE_PAGES 32
#define MAX_ICACHE_PAGES 32
#ifdef CONFIG_CACHE_WRITEBACK
static void sh2a_flush_oc_line(unsigned long v, int way)
{
unsigned long addr = (v & 0x000007f0) | (way << 11);
unsigned long data;
data = __raw_readl(CACHE_OC_ADDRESS_ARRAY | addr);
if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
data &= ~SH_CACHE_UPDATED;
__raw_writel(data, CACHE_OC_ADDRESS_ARRAY | addr);
}
}
#endif
static void sh2a_invalidate_line(unsigned long cache_addr, unsigned long v)
{
/* Set associative bit to hit all ways */
unsigned long addr = (v & 0x000007f0) | SH_CACHE_ASSOC;
__raw_writel((addr & CACHE_PHYSADDR_MASK), cache_addr | addr);
}
/*
* Write back the dirty D-caches, but not invalidate them.
*/
static void sh2a__flush_wback_region(void *start, int size)
{
#ifdef CONFIG_CACHE_WRITEBACK
unsigned long v;
unsigned long begin, end;
unsigned long flags;
int nr_ways;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
nr_ways = current_cpu_data.dcache.ways;
local_irq_save(flags);
jump_to_uncached();
/* If there are too many pages then flush the entire cache */
if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
begin = CACHE_OC_ADDRESS_ARRAY;
end = begin + (nr_ways * current_cpu_data.dcache.way_size);
for (v = begin; v < end; v += L1_CACHE_BYTES) {
unsigned long data = __raw_readl(v);
if (data & SH_CACHE_UPDATED)
__raw_writel(data & ~SH_CACHE_UPDATED, v);
}
} else {
int way;
for (way = 0; way < nr_ways; way++) {
for (v = begin; v < end; v += L1_CACHE_BYTES)
sh2a_flush_oc_line(v, way);
}
}
back_to_cached();
local_irq_restore(flags);
#endif
}
/*
* Write back the dirty D-caches and invalidate them.
*/
static void sh2a__flush_purge_region(void *start, int size)
{
unsigned long v;
unsigned long begin, end;
unsigned long flags;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
local_irq_save(flags);
jump_to_uncached();
for (v = begin; v < end; v+=L1_CACHE_BYTES) {
#ifdef CONFIG_CACHE_WRITEBACK
int way;
int nr_ways = current_cpu_data.dcache.ways;
for (way = 0; way < nr_ways; way++)
sh2a_flush_oc_line(v, way);
#endif
sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
}
back_to_cached();
local_irq_restore(flags);
}
/*
* Invalidate the D-caches, but no write back please
*/
static void sh2a__flush_invalidate_region(void *start, int size)
{
unsigned long v;
unsigned long begin, end;
unsigned long flags;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
local_irq_save(flags);
jump_to_uncached();
/* If there are too many pages then just blow the cache */
if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
__raw_writel(__raw_readl(SH_CCR) | CCR_OCACHE_INVALIDATE,
SH_CCR);
} else {
for (v = begin; v < end; v += L1_CACHE_BYTES)
sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
}
back_to_cached();
local_irq_restore(flags);
}
/*
* Write back the range of D-cache, and purge the I-cache.
*/
static void sh2a_flush_icache_range(void *args)
{
struct flusher_data *data = args;
unsigned long start, end;
unsigned long v;
unsigned long flags;
start = data->addr1 & ~(L1_CACHE_BYTES-1);
end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
#ifdef CONFIG_CACHE_WRITEBACK
sh2a__flush_wback_region((void *)start, end-start);
#endif
local_irq_save(flags);
jump_to_uncached();
/* I-Cache invalidate */
/* If there are too many pages then just blow the cache */
if (((end - start) >> PAGE_SHIFT) >= MAX_ICACHE_PAGES) {
__raw_writel(__raw_readl(SH_CCR) | CCR_ICACHE_INVALIDATE,
SH_CCR);
} else {
for (v = start; v < end; v += L1_CACHE_BYTES)
sh2a_invalidate_line(CACHE_IC_ADDRESS_ARRAY, v);
}
back_to_cached();
local_irq_restore(flags);
}
void __init sh2a_cache_init(void)
{
local_flush_icache_range = sh2a_flush_icache_range;
__flush_wback_region = sh2a__flush_wback_region;
__flush_purge_region = sh2a__flush_purge_region;
__flush_invalidate_region = sh2a__flush_invalidate_region;
}