2 * Cache-handling routined for MIPS CPUs
4 * Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
6 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm-offsets.h>
12 #include <asm/regdef.h>
13 #include <asm/mipsregs.h>
14 #include <asm/addrspace.h>
15 #include <asm/cacheops.h>
17 #ifndef CONFIG_SYS_MIPS_CACHE_MODE
18 #define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT
27 #define INDEX_BASE CKSEG0
29 .macro f_fill64 dst, offset, val
30 LONG_S \val, (\offset + 0 * LONGSIZE)(\dst)
31 LONG_S \val, (\offset + 1 * LONGSIZE)(\dst)
32 LONG_S \val, (\offset + 2 * LONGSIZE)(\dst)
33 LONG_S \val, (\offset + 3 * LONGSIZE)(\dst)
34 LONG_S \val, (\offset + 4 * LONGSIZE)(\dst)
35 LONG_S \val, (\offset + 5 * LONGSIZE)(\dst)
36 LONG_S \val, (\offset + 6 * LONGSIZE)(\dst)
37 LONG_S \val, (\offset + 7 * LONGSIZE)(\dst)
39 LONG_S \val, (\offset + 8 * LONGSIZE)(\dst)
40 LONG_S \val, (\offset + 9 * LONGSIZE)(\dst)
41 LONG_S \val, (\offset + 10 * LONGSIZE)(\dst)
42 LONG_S \val, (\offset + 11 * LONGSIZE)(\dst)
43 LONG_S \val, (\offset + 12 * LONGSIZE)(\dst)
44 LONG_S \val, (\offset + 13 * LONGSIZE)(\dst)
45 LONG_S \val, (\offset + 14 * LONGSIZE)(\dst)
46 LONG_S \val, (\offset + 15 * LONGSIZE)(\dst)
51 * mips_init_icache(uint PRId, ulong icache_size, unchar icache_linesz)
53 LEAF(mips_init_icache)
56 /* clear tag to invalidate */
59 1: cache INDEX_STORE_TAG_I, 0(t0)
62 /* fill once, so data field parity is correct */
67 /* invalidate again - prudent but not strictly neccessary */
69 1: cache INDEX_STORE_TAG_I, 0(t0)
76 * mips_init_dcache(uint PRId, ulong dcache_size, unchar dcache_linesz)
78 LEAF(mips_init_dcache)
84 1: cache INDEX_STORE_TAG_D, 0(t0)
87 /* load from each line (in cached space) */
94 1: cache INDEX_STORE_TAG_D, 0(t0)
100 .macro l1_info sz, line_sz, off
104 mfc0 $1, CP0_CONFIG, 1
106 /* detect line size */
107 srl \line_sz, $1, \off + MIPS_CONF1_DL_SHIFT - MIPS_CONF1_DA_SHIFT
108 andi \line_sz, \line_sz, (MIPS_CONF1_DL >> MIPS_CONF1_DL_SHIFT)
112 sllv \line_sz, \sz, \line_sz
114 /* detect associativity */
115 srl \sz, $1, \off + MIPS_CONF1_DA_SHIFT - MIPS_CONF1_DA_SHIFT
116 andi \sz, \sz, (MIPS_CONF1_DA >> MIPS_CONF1_DA_SHIFT)
120 mul \sz, \sz, \line_sz
122 /* detect log32(sets) */
123 srl $1, $1, \off + MIPS_CONF1_DS_SHIFT - MIPS_CONF1_DA_SHIFT
124 andi $1, $1, (MIPS_CONF1_DS >> MIPS_CONF1_DS_SHIFT)
128 /* sz <<= log32(sets) */
138 * mips_cache_reset - low level initialisation of the primary caches
140 * This routine initialises the primary caches to ensure that they have good
141 * parity. It must be called by the ROM before any cached locations are used
142 * to prevent the possibility of data with bad parity being written to memory.
144 * To initialise the instruction cache it is essential that a source of data
145 * with good parity is available. This routine will initialise an area of
146 * memory starting at location zero to be used as a source of parity.
151 NESTED(mips_cache_reset, 0, ra)
154 #ifdef CONFIG_SYS_ICACHE_SIZE
155 li t2, CONFIG_SYS_ICACHE_SIZE
156 li t8, CONFIG_SYS_CACHELINE_SIZE
158 l1_info t2, t8, MIPS_CONF1_IA_SHIFT
161 #ifdef CONFIG_SYS_DCACHE_SIZE
162 li t3, CONFIG_SYS_DCACHE_SIZE
163 li t9, CONFIG_SYS_CACHELINE_SIZE
165 l1_info t3, t9, MIPS_CONF1_DA_SHIFT
168 /* Determine the largest L1 cache size */
169 #if defined(CONFIG_SYS_ICACHE_SIZE) && defined(CONFIG_SYS_DCACHE_SIZE)
170 #if CONFIG_SYS_ICACHE_SIZE > CONFIG_SYS_DCACHE_SIZE
171 li v0, CONFIG_SYS_ICACHE_SIZE
173 li v0, CONFIG_SYS_DCACHE_SIZE
181 * Now clear that much memory starting from zero.
186 f_fill64 a0, -64, zero
190 * The caches are probably in an indeterminate state,
191 * so we force good parity into them by doing an
192 * invalidate, load/fill, invalidate for each line.
196 * Assume bottom of RAM will generate good parity for the cache.
200 * Initialize the I-cache first,
204 PTR_LA v1, mips_init_icache
208 * then initialize D-cache.
212 PTR_LA v1, mips_init_dcache
216 END(mips_cache_reset)
219 * dcache_status - get cache status
221 * RETURNS: 0 - cache disabled; 1 - cache enabled
226 li t1, CONF_CM_UNCACHED
227 andi t0, t0, CONF_CM_CMASK
235 * dcache_disable - disable cache
244 ori t0, t0, CONF_CM_UNCACHED
250 * dcache_enable - enable cache
257 ori t0, CONF_CM_CMASK
258 xori t0, CONF_CM_CMASK
259 ori t0, CONFIG_SYS_MIPS_CACHE_MODE