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| author | Paul Burton <paul.burton@imgtec.com> | 2015-01-29 01:28:02 +0000 |
|---|---|---|
| committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2015-01-29 12:55:01 +0100 |
| commit | dd7c72006e51f0d27e5cb1dcf60d5b9bf307565e (patch) | |
| tree | a2db8dc572e96427919f6f1bae496c3abff8cd5e /arch/mips/lib | |
| parent | ca4e833cd6409c72e5b13ee803a4f08381e6d160 (diff) | |
| download | u-boot-imx-dd7c72006e51f0d27e5cb1dcf60d5b9bf307565e.zip u-boot-imx-dd7c72006e51f0d27e5cb1dcf60d5b9bf307565e.tar.gz u-boot-imx-dd7c72006e51f0d27e5cb1dcf60d5b9bf307565e.tar.bz2 | |
MIPS: allow systems to skip loads during cache init
Current MIPS systems do not require that loads be performed to force the
parity of cache lines, a simple invalidate by clearing the tag for each
line will suffice. Thus this patch makes the loads & subsequent second
invalidation conditional upon the CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
option, and defines that for existing mips32 targets. Exceptions are
malta where this is known to be unnecessary, and qemu-mips where caches
are not implemented.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Diffstat (limited to 'arch/mips/lib')
| -rw-r--r-- | arch/mips/lib/cache_init.S | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S index cbd04bd..04a36b2 100644 --- a/arch/mips/lib/cache_init.S +++ b/arch/mips/lib/cache_init.S @@ -113,6 +113,8 @@ LEAF(mips_cache_reset) l1_info t3, t9, MIPS_CONF1_DA_SHIFT #endif +#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD + /* 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 @@ -134,14 +136,15 @@ LEAF(mips_cache_reset) 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. - */ +#endif /* CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD */ /* - * Assume bottom of RAM will generate good parity for the cache. + * The caches are probably in an indeterminate state, so we force good + * parity into them by doing an invalidate for each line. If + * CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD is set then we'll proceed to + * perform a load/fill & a further invalidate for each line, assuming + * that the bottom of RAM (having just been cleared) will generate good + * parity for the cache. */ /* @@ -153,12 +156,14 @@ LEAF(mips_cache_reset) PTR_ADDU t1, t0, t2 /* clear tag to invalidate */ cache_loop t0, t1, t8, INDEX_STORE_TAG_I +#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD /* fill once, so data field parity is correct */ PTR_LI t0, INDEX_BASE cache_loop t0, t1, t8, FILL /* invalidate again - prudent but not strictly neccessary */ PTR_LI t0, INDEX_BASE cache_loop t0, t1, t8, INDEX_STORE_TAG_I +#endif /* * then initialize D-cache. @@ -169,6 +174,7 @@ LEAF(mips_cache_reset) PTR_ADDU t1, t0, t3 /* clear all tags */ cache_loop t0, t1, t9, INDEX_STORE_TAG_D +#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD /* load from each line (in cached space) */ PTR_LI t0, INDEX_BASE 2: LONG_L zero, 0(t0) @@ -177,6 +183,7 @@ LEAF(mips_cache_reset) /* clear all tags */ PTR_LI t0, INDEX_BASE cache_loop t0, t1, t9, INDEX_STORE_TAG_D +#endif 3: jr ra END(mips_cache_reset) |