aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/cache-xsc3l2.c
blob: 6c3edeb66e74059a7e1398b09c0d224a1e253240 (plain) (blame)
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
/*
 * arch/arm/mm/cache-xsc3l2.c - XScale3 L2 cache controller support
 *
 * Copyright (C) 2007 ARM Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/init.h>
#include <linux/highmem.h>
#include <asm/cp15.h>
#include <asm/cputype.h>
#include <asm/cacheflush.h>

#define CR_L2	(1 << 26)

#define CACHE_LINE_SIZE		32
#define CACHE_LINE_SHIFT	5
#define CACHE_WAY_PER_SET	8

#define CACHE_WAY_SIZE(l2ctype)	(8192 << (((l2ctype) >> 8) & 0xf))
#define CACHE_SET_SIZE(l2ctype)	(CACHE_WAY_SIZE(l2ctype) >> CACHE_LINE_SHIFT)

static inline int xsc3_l2_present(void)
{
	unsigned long l2ctype;

	__asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));

	return !!(l2ctype & 0xf8);
}

static inline void xsc3_l2_clean_mva(unsigned long addr)
{
	__asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr));
}

static inline void xsc3_l2_inv_mva(unsigned long addr)
{
	__asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr));
}

static inline void xsc3_l2_inv_all(void)
{
	unsigned long l2ctype, set_way;
	int set, way;

	__asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));

	for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
		for (way = 0; way < CACHE_WAY_PER_SET; way++) {
			set_way = (way << 29) | (set << 5);
			__asm__("mcr p15, 1, %0, c7, c11, 2" : : "r"(set_way));
		}
	}

	dsb();
}

static inline void l2_unmap_va(unsigned long va)
{
#ifdef CONFIG_HIGHMEM
	if (va != -1)
		kunmap_atomic((void *)va);
#endif
}

static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va)
{
#ifdef CONFIG_HIGHMEM
	unsigned long va = prev_va & PAGE_MASK;
	unsigned long pa_offset = pa << (32 - PAGE_SHIFT);
	if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) {
		/*
		 * Switching to a new page.  Because cache ops are
		 * using virtual addresses only, we must put a mapping
		 * in place for it.
		 */
		l2_unmap_va(prev_va);
		va = (unsigned long)kmap_atomic_pfn(pa >> PAGE_SHIFT);
	}
	return va + (pa_offset >> (32 - PAGE_SHIFT));
#else
	return __phys_to_virt(pa);
#endif
}

static void xsc3_l2_inv_range(unsigned long start, unsigned long end)
{
	unsigned long vaddr;

	if (start == 0 && end == -1ul) {
		xsc3_l2_inv_all();
		return;
	}

	vaddr = -1;  /* to force the first mapping */

	/*
	 * Clean and invalidate partial first cache line.
	 */
	if (start & (CACHE_LINE_SIZE - 1)) {
		vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr);
		xsc3_l2_clean_mva(vaddr);
		xsc3_l2_inv_mva(vaddr);
		start = (start | (CACHE_LINE_SIZE - 1)) + 1;
	}

	/*
	 * Invalidate all full cache lines between 'start' and 'end'.
	 */
	while (start < (end & ~(CACHE_LINE_SIZE - 1))) {
		vaddr = l2_map_va(start, vaddr);
		xsc3_l2_inv_mva(vaddr);
		start += CACHE_LINE_SIZE;
	}

	/*
	 * Clean and invalidate partial last cache line.
	 */
	if (start < end) {
		vaddr = l2_map_va(start, vaddr);
		xsc3_l2_clean_mva(vaddr);
		xsc3_l2_inv_mva(vaddr);
	}

	l2_unmap_va(vaddr);

	dsb();
}

static void xsc3_l2_clean_range(unsigned long start, unsigned long end)
{
	unsigned long vaddr;

	vaddr = -1;  /* to force the first mapping */

	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
		vaddr = l2_map_va(start, vaddr);
		xsc3_l2_clean_mva(vaddr);
		start += CACHE_LINE_SIZE;
	}

	l2_unmap_va(vaddr);

	dsb();
}

/*
 * optimize L2 flush all operation by set/way format
 */
static inline void xsc3_l2_flush_all(void)
{
	unsigned long l2ctype, set_way;
	int set, way;

	__asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));

	for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
		for (way = 0; way < CACHE_WAY_PER_SET; way++) {
			set_way = (way << 29) | (set << 5);
			__asm__("mcr p15, 1, %0, c7, c15, 2" : : "r"(set_way));
		}
	}

	dsb();
}

static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
{
	unsigned long vaddr;

	if (start == 0 && end == -1ul) {
		xsc3_l2_flush_all();
		return;
	}

	vaddr = -1;  /* to force the first mapping */

	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
		vaddr = l2_map_va(start, vaddr);
		xsc3_l2_clean_mva(vaddr);
		xsc3_l2_inv_mva(vaddr);
		start += CACHE_LINE_SIZE;
	}

	l2_unmap_va(vaddr);

	dsb();
}

static int __init xsc3_l2_init(void)
{
	if (!cpu_is_xsc3() || !xsc3_l2_present())
		return 0;

	if (get_cr() & CR_L2) {
		pr_info("XScale3 L2 cache enabled.\n");
		xsc3_l2_inv_all();

		outer_cache.inv_range = xsc3_l2_inv_range;
		outer_cache.clean_range = xsc3_l2_clean_range;
		outer_cache.flush_range = xsc3_l2_flush_range;
	}

	return 0;
}
core_initcall(xsc3_l2_init);