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authorPaul Burton <paul.burton@imgtec.com>2015-01-29 01:27:59 +0000
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>2015-01-29 12:55:01 +0100
commit536cb7ce1aca10c326ac864b3e1d05ab57b3ec7e (patch)
treeb0550850214891149050109b60ff9b0ed1839353
parent4a5d8898bca3e442b61e34b811aec8332752efd3 (diff)
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MIPS: refactor L1 cache config reads to a macro
Reduce duplication between reading the configuration of the L1 dcache & icache by performing both using a macro which calculates the appropriate line & cache sizes from the coprocessor 0 Config1 register. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
-rw-r--r--arch/mips/lib/cache_init.S97
1 files changed, 41 insertions, 56 deletions
diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S
index 6c02bf9..2e036d9 100644
--- a/arch/mips/lib/cache_init.S
+++ b/arch/mips/lib/cache_init.S
@@ -97,6 +97,43 @@ LEAF(mips_init_dcache)
9: jr ra
END(mips_init_dcache)
+ .macro l1_info sz, line_sz, off
+ .set push
+ .set noat
+
+ mfc0 $1, CP0_CONFIG, 1
+
+ /* detect line size */
+ srl \line_sz, $1, \off + MIPS_CONF1_DL_SHIFT - MIPS_CONF1_DA_SHIFT
+ andi \line_sz, \line_sz, (MIPS_CONF1_DL >> MIPS_CONF1_DL_SHIFT)
+ move \sz, zero
+ beqz \line_sz, 10f
+ li \sz, 2
+ sllv \line_sz, \sz, \line_sz
+
+ /* detect associativity */
+ srl \sz, $1, \off + MIPS_CONF1_DA_SHIFT - MIPS_CONF1_DA_SHIFT
+ andi \sz, \sz, (MIPS_CONF1_DA >> MIPS_CONF1_DA_SHIFT)
+ addi \sz, \sz, 1
+
+ /* sz *= line_sz */
+ mul \sz, \sz, \line_sz
+
+ /* detect log32(sets) */
+ srl $1, $1, \off + MIPS_CONF1_DS_SHIFT - MIPS_CONF1_DA_SHIFT
+ andi $1, $1, (MIPS_CONF1_DS >> MIPS_CONF1_DS_SHIFT)
+ addiu $1, $1, 1
+ andi $1, $1, 0x7
+
+ /* sz <<= log32(sets) */
+ sllv \sz, \sz, $1
+
+ /* sz *= 32 */
+ li $1, 32
+ mul \sz, \sz, $1
+10:
+ .set pop
+ .endm
/*
* mips_cache_reset - low level initialisation of the primary caches
*
@@ -114,70 +151,18 @@ LEAF(mips_init_dcache)
NESTED(mips_cache_reset, 0, ra)
move RA, ra
-#if !defined(CONFIG_SYS_ICACHE_SIZE) || !defined(CONFIG_SYS_DCACHE_SIZE) || \
- !defined(CONFIG_SYS_CACHELINE_SIZE)
- /* read Config1 for use below */
- mfc0 t5, CP0_CONFIG, 1
-#endif
-
-#ifdef CONFIG_SYS_CACHELINE_SIZE
- li t9, CONFIG_SYS_CACHELINE_SIZE
- li t8, CONFIG_SYS_CACHELINE_SIZE
-#else
- /* Detect I-cache line size. */
- srl t8, t5, MIPS_CONF1_IL_SHIFT
- andi t8, t8, (MIPS_CONF1_IL >> MIPS_CONF1_IL_SHIFT)
- beqz t8, 1f
- li t6, 2
- sllv t8, t6, t8
-
-1: /* Detect D-cache line size. */
- srl t9, t5, MIPS_CONF1_DL_SHIFT
- andi t9, t9, (MIPS_CONF1_DL >> MIPS_CONF1_DL_SHIFT)
- beqz t9, 1f
- li t6, 2
- sllv t9, t6, t9
-1:
-#endif
-
#ifdef CONFIG_SYS_ICACHE_SIZE
li t2, CONFIG_SYS_ICACHE_SIZE
+ li t8, CONFIG_SYS_CACHELINE_SIZE
#else
- /* Detect I-cache size. */
- srl t6, t5, MIPS_CONF1_IS_SHIFT
- andi t6, t6, (MIPS_CONF1_IS >> MIPS_CONF1_IS_SHIFT)
- li t4, 32
- xori t2, t6, 0x7
- beqz t2, 1f
- addi t6, t6, 1
- sllv t4, t4, t6
-1: /* At this point t4 == I-cache sets. */
- mul t2, t4, t8
- srl t6, t5, MIPS_CONF1_IA_SHIFT
- andi t6, t6, (MIPS_CONF1_IA >> MIPS_CONF1_IA_SHIFT)
- addi t6, t6, 1
- /* At this point t6 == I-cache ways. */
- mul t2, t2, t6
+ l1_info t2, t8, MIPS_CONF1_IA_SHIFT
#endif
#ifdef CONFIG_SYS_DCACHE_SIZE
li t3, CONFIG_SYS_DCACHE_SIZE
+ li t9, CONFIG_SYS_CACHELINE_SIZE
#else
- /* Detect D-cache size. */
- srl t6, t5, MIPS_CONF1_DS_SHIFT
- andi t6, t6, (MIPS_CONF1_DS >> MIPS_CONF1_DS_SHIFT)
- li t4, 32
- xori t3, t6, 0x7
- beqz t3, 1f
- addi t6, t6, 1
- sllv t4, t4, t6
-1: /* At this point t4 == I-cache sets. */
- mul t3, t4, t9
- srl t6, t5, MIPS_CONF1_DA_SHIFT
- andi t6, t6, (MIPS_CONF1_DA >> MIPS_CONF1_DA_SHIFT)
- addi t6, t6, 1
- /* At this point t6 == I-cache ways. */
- mul t3, t3, t6
+ l1_info t3, t9, MIPS_CONF1_DA_SHIFT
#endif
/* Determine the largest L1 cache size */