diff options
Diffstat (limited to 'arch/mips/lib')
| -rw-r--r-- | arch/mips/lib/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/lib/cache_init.S | 277 |
2 files changed, 278 insertions, 0 deletions
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile index d939ee6..ac536da 100644 --- a/arch/mips/lib/Makefile +++ b/arch/mips/lib/Makefile @@ -6,6 +6,7 @@ # obj-y += cache.o +obj-y += cache_init.o obj-y += io.o obj-$(CONFIG_CMD_BOOTM) += bootm.o diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S new file mode 100644 index 0000000..6c02bf9 --- /dev/null +++ b/arch/mips/lib/cache_init.S @@ -0,0 +1,277 @@ +/* + * Cache-handling routined for MIPS CPUs + * + * Copyright (c) 2003 Wolfgang Denk <wd@denx.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm-offsets.h> +#include <config.h> +#include <asm/asm.h> +#include <asm/regdef.h> +#include <asm/mipsregs.h> +#include <asm/addrspace.h> +#include <asm/cacheops.h> + +#ifndef CONFIG_SYS_MIPS_CACHE_MODE +#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT +#endif + +#ifdef CONFIG_64BIT +# define RA ta3 +#else +# define RA t7 +#endif + +#define INDEX_BASE CKSEG0 + + .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 INDEX_STORE_TAG_I, 0(t0) + PTR_ADDU t0, a2 + bne t0, t1, 1b + /* fill once, so data field parity is correct */ + PTR_LI t0, INDEX_BASE +2: cache FILL, 0(t0) + PTR_ADDU t0, a2 + bne t0, t1, 2b + /* invalidate again - prudent but not strictly neccessary */ + PTR_LI t0, INDEX_BASE +1: cache INDEX_STORE_TAG_I, 0(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 INDEX_STORE_TAG_D, 0(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 INDEX_STORE_TAG_D, 0(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 + +#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 +#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 +#endif + +#ifdef CONFIG_SYS_DCACHE_SIZE + li t3, CONFIG_SYS_DCACHE_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 +#endif + + /* Determine the largest L1 cache size */ +#if defined(CONFIG_SYS_ICACHE_SIZE) && defined(CONFIG_SYS_DCACHE_SIZE) +#if CONFIG_SYS_ICACHE_SIZE > CONFIG_SYS_DCACHE_SIZE + li v0, CONFIG_SYS_ICACHE_SIZE +#else + li v0, CONFIG_SYS_DCACHE_SIZE +#endif +#else + move v0, t2 + sltu t1, t2, t3 + movn v0, t3, t1 +#endif + /* + * 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, t8 + PTR_LA v1, mips_init_icache + jalr v1 + + /* + * then initialize D-cache. + */ + move a1, t3 + move a2, t9 + PTR_LA v1, mips_init_dcache + jalr v1 + + 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, CONFIG_SYS_MIPS_CACHE_MODE + mtc0 t0, CP0_CONFIG + jr ra + END(dcache_enable) |