summaryrefslogtreecommitdiff
path: root/arch/mips/cpu/cache.S
blob: ff4f11cf7878e9718bb372b1a4dc3c39c0491f67 (plain)
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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
/*
 *  Cache-handling routined for MIPS CPUs
 *
 *  Copyright (c) 2003	Wolfgang Denk <wd@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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 <config.h>
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/cacheops.h>

#define RA		t8

/*
 * 16kB is the maximum size of instruction and data caches on MIPS 4K,
 * 64kB is on 4KE, 24K, 5K, etc. Set bigger size for convenience.
 *
 * Note that the above size is the maximum size of primary cache. U-Boot
 * doesn't have L2 cache support for now.
 */
#define MIPS_MAX_CACHE_SIZE	0x10000

#define INDEX_BASE	CKSEG0

	.macro	cache_op op addr
	.set	push
	.set	noreorder
	.set	mips3
	cache	\op, 0(\addr)
	.set	pop
	.endm

/*
 * cacheop macro to automate cache operations
 * first some helpers...
 */
#define _mincache(size, maxsize) \
   bltu  size,maxsize,9f ; \
   move  size,maxsize ;    \
9:

#define _align(minaddr, maxaddr, linesize) \
   .set noat ; \
   subu  AT,linesize,1 ;   \
   not   AT ;        \
   and   minaddr,AT ;      \
   addu  maxaddr,-1 ;      \
   and   maxaddr,AT ;      \
   .set at

/* general operations */
#define doop1(op1) \
   cache op1,0(a0)
#define doop2(op1, op2) \
   cache op1,0(a0) ;    \
   nop ;          \
   cache op2,0(a0)

/* specials for cache initialisation */
#define doop1lw(op1) \
   lw zero,0(a0)
#define doop1lw1(op1) \
   cache op1,0(a0) ;    \
   lw zero,0(a0) ;      \
   cache op1,0(a0)
#define doop121(op1,op2) \
   cache op1,0(a0) ;    \
   nop;           \
   cache op2,0(a0) ;    \
   nop;           \
   cache op1,0(a0)

#define _oploopn(minaddr, maxaddr, linesize, tag, ops) \
   .set  noreorder ;    \
10:   doop##tag##ops ;  \
   bne     minaddr,maxaddr,10b ; \
   add      minaddr,linesize ;   \
   .set  reorder

/* finally the cache operation macros */
#define vcacheopn(kva, n, cacheSize, cacheLineSize, tag, ops) \
   blez  n,11f ;        \
   addu  n,kva ;        \
   _align(kva, n, cacheLineSize) ; \
   _oploopn(kva, n, cacheLineSize, tag, ops) ; \
11:

#define icacheopn(kva, n, cacheSize, cacheLineSize, tag, ops) \
   _mincache(n, cacheSize);   \
   blez  n,11f ;        \
   addu  n,kva ;        \
   _align(kva, n, cacheLineSize) ; \
   _oploopn(kva, n, cacheLineSize, tag, ops) ; \
11:

#define vcacheop(kva, n, cacheSize, cacheLineSize, op) \
   vcacheopn(kva, n, cacheSize, cacheLineSize, 1, (op))

#define icacheop(kva, n, cacheSize, cacheLineSize, op) \
   icacheopn(kva, n, cacheSize, cacheLineSize, 1, (op))

	.macro	f_fill64 dst, offset, val
	LONG_S	\val, (\offset +  0 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  1 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  2 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  3 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  4 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  5 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  6 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  7 * LONGSIZE)(\dst)
#if LONGSIZE == 4
	LONG_S	\val, (\offset +  8 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset +  9 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 10 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 11 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 12 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 13 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 14 * LONGSIZE)(\dst)
	LONG_S	\val, (\offset + 15 * LONGSIZE)(\dst)
#endif
	.endm

/*
 * mips_init_icache(uint PRId, ulong icache_size, unchar icache_linesz)
 */
LEAF(mips_init_icache)
	blez	a1, 9f
	mtc0	zero, CP0_TAGLO
	/* clear tag to invalidate */
	PTR_LI		t0, INDEX_BASE
	PTR_ADDU	t1, t0, a1
1:	cache_op	Index_Store_Tag_I t0
	PTR_ADDU	t0, a2
	bne		t0, t1, 1b
	/* fill once, so data field parity is correct */
	PTR_LI		t0, INDEX_BASE
2:	cache_op	Fill t0
	PTR_ADDU	t0, a2
	bne		t0, t1, 2b
	/* invalidate again - prudent but not strictly neccessary */
	PTR_LI		t0, INDEX_BASE
1:	cache_op	Index_Store_Tag_I t0
	PTR_ADDU	t0, a2
	bne		t0, t1, 1b
9:	jr	ra
	END(mips_init_icache)

/*
 * mips_init_dcache(uint PRId, ulong dcache_size, unchar dcache_linesz)
 */
LEAF(mips_init_dcache)
	blez	a1, 9f
	mtc0	zero, CP0_TAGLO
	/* clear all tags */
	PTR_LI		t0, INDEX_BASE
	PTR_ADDU	t1, t0, a1
1:	cache_op	Index_Store_Tag_D t0
	PTR_ADDU	t0, a2
	bne		t0, t1, 1b
	/* load from each line (in cached space) */
	PTR_LI		t0, INDEX_BASE
2:	LONG_L		zero, 0(t0)
	PTR_ADDU	t0, a2
	bne		t0, t1, 2b
	/* clear all tags */
	PTR_LI		t0, INDEX_BASE
1:	cache_op	Index_Store_Tag_D t0
	PTR_ADDU	t0, a2
	bne		t0, t1, 1b
9:	jr	ra
	END(mips_init_dcache)

/*******************************************************************************
*
* mips_cache_reset - low level initialisation of the primary caches
*
* This routine initialises the primary caches to ensure that they
* have good parity.  It must be called by the ROM before any cached locations
* are used to prevent the possibility of data with bad parity being written to
* memory.
* To initialise the instruction cache it is essential that a source of data
* with good parity is available. This routine
* will initialise an area of memory starting at location zero to be used as
* a source of parity.
*
* RETURNS: N/A
*
*/
NESTED(mips_cache_reset, 0, ra)
	move	RA, ra
	li	t2, CONFIG_SYS_ICACHE_SIZE
	li	t3, CONFIG_SYS_DCACHE_SIZE
	li	t4, CONFIG_SYS_CACHELINE_SIZE
	move	t5, t4

	li	v0, MIPS_MAX_CACHE_SIZE

	/*
	 * Now clear that much memory starting from zero.
	 */
	PTR_LI		a0, CKSEG1
	PTR_ADDU	a1, a0, v0
2:	PTR_ADDIU	a0, 64
	f_fill64	a0, -64, zero
	bne		a0, a1, 2b

	/*
	 * The caches are probably in an indeterminate state,
	 * so we force good parity into them by doing an
	 * invalidate, load/fill, invalidate for each line.
	 */

	/*
	 * Assume bottom of RAM will generate good parity for the cache.
	 */

	/*
	 * Initialize the I-cache first,
	 */
	move	a1, t2
	move	a2, t4
	PTR_LA	t7, mips_init_icache
	jalr	t7

	/*
	 * then initialize D-cache.
	 */
	move	a1, t3
	move	a2, t5
	PTR_LA	t7, mips_init_dcache
	jalr	t7

	jr	RA
	END(mips_cache_reset)

/*******************************************************************************
*
* dcache_status - get cache status
*
* RETURNS: 0 - cache disabled; 1 - cache enabled
*
*/
LEAF(dcache_status)
	mfc0	t0, CP0_CONFIG
	li	t1, CONF_CM_UNCACHED
	andi	t0, t0, CONF_CM_CMASK
	move	v0, zero
	beq	t0, t1, 2f
	li	v0, 1
2:	jr	ra
	END(dcache_status)

/*******************************************************************************
*
* dcache_disable - disable cache
*
* RETURNS: N/A
*
*/
LEAF(dcache_disable)
	mfc0	t0, CP0_CONFIG
	li	t1, -8
	and	t0, t0, t1
	ori	t0, t0, CONF_CM_UNCACHED
	mtc0	t0, CP0_CONFIG
	jr	ra
	END(dcache_disable)

/*******************************************************************************
*
* dcache_enable - enable cache
*
* RETURNS: N/A
*
*/
LEAF(dcache_enable)
	mfc0	t0, CP0_CONFIG
	ori	t0, CONF_CM_CMASK
	xori	t0, CONF_CM_CMASK
	ori	t0, CONF_CM_CACHABLE_NONCOHERENT
	mtc0	t0, CP0_CONFIG
	jr	ra
	END(dcache_enable)

#ifdef CONFIG_SYS_INIT_RAM_LOCK_MIPS
/*******************************************************************************
*
* mips_cache_lock - lock RAM area pointed to by a0 in cache.
*
* RETURNS: N/A
*
*/
#if defined(CONFIG_PURPLE)
# define	CACHE_LOCK_SIZE	(CONFIG_SYS_DCACHE_SIZE/2)
#else
# define	CACHE_LOCK_SIZE	(CONFIG_SYS_DCACHE_SIZE)
#endif
	.globl	mips_cache_lock
	.ent	mips_cache_lock
mips_cache_lock:
	li	a1, CKSEG0 - CACHE_LOCK_SIZE
	addu	a0, a1
	li	a2, CACHE_LOCK_SIZE
	li	a3, CONFIG_SYS_CACHELINE_SIZE
	move	a1, a2
	icacheop(a0,a1,a2,a3,0x1d)

	jr	ra

	.end	mips_cache_lock
#endif /* CONFIG_SYS_INIT_RAM_LOCK_MIPS */