diff options
| author | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2018-09-07 19:02:03 +0200 |
|---|---|---|
| committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2018-09-22 21:02:03 +0200 |
| commit | 2f85c2be21dfee1e8ac1f8fb9759be7108233e85 (patch) | |
| tree | e2c84aa7045529245c41ec07d0dd6ec51db3266d /arch | |
| parent | d1c3d8bdfa41a7002bc9c9c0fe8cf7b41d573c0e (diff) | |
MIPS: cache: reimplement dcache_[status, enable, disable]
Those functions are not needed during cache init and can be
implemented in C. Only support the safe disabling of caches when
this is required for booting an OS. Reenabling caches is much
harder to implement if an optional coherency manager must be
supported. As there is no real use-case anyway, dcache_enable
is implemented with an error message.
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/lib/cache.c | 20 | ||||
| -rw-r--r-- | arch/mips/lib/cache_init.S | 46 |
2 files changed, 20 insertions, 46 deletions
diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c index 1d14fc487e..d56fd1e0f4 100644 --- a/arch/mips/lib/cache.c +++ b/arch/mips/lib/cache.c @@ -175,3 +175,23 @@ void invalidate_dcache_range(ulong start_addr, ulong stop) /* ensure cache ops complete before any further memory accesses */ sync(); } + +int dcache_status(void) +{ + unsigned int cca = read_c0_config() & CONF_CM_CMASK; + return cca != CONF_CM_UNCACHED; +} + +void dcache_enable(void) +{ + puts("Not supported!\n"); +} + +void dcache_disable(void) +{ + /* change CCA to uncached */ + change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED); + + /* ensure the pipeline doesn't contain now-invalid instructions */ + instruction_hazard_barrier(); +} diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S index b209f23f0a..395bfffdb8 100644 --- a/arch/mips/lib/cache_init.S +++ b/arch/mips/lib/cache_init.S @@ -423,49 +423,3 @@ return: sync 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) |