diff options
| author | Simon Glass <sjg@chromium.org> | 2011-06-07 11:12:37 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2011-08-29 10:39:16 -0700 |
| commit | 09aaff19dc440ce967e125392cb7014279db830b (patch) | |
| tree | 1f837497969820492f47b64abf8dc15db5080d0b /arch/arm/include/asm | |
| parent | ad828a69c4ea6d882fd1a822e4a6c25e2d3f075d (diff) | |
Add control over cachability of memory regions
This is needed for LCD support, where we want to make the LCD frame buffer
write-through (or off) rather than write-back.
BUG=chromium-os:14082
TEST=build U-Boot
Change-Id: I7e1bf9358b8c2fb7ae524cc74cdcfa5b0fb60fbe
Reviewed-on: http://gerrit.chromium.org/gerrit/2239
Reviewed-by: Anton Staaf <robotboy@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/system.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 2b28a261ba..327eccd5ca 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -75,6 +75,28 @@ static inline void set_cr(unsigned int val) isb(); } +/* options available for data cache on each page */ +enum dcache_option { + DCACHE_OFF, + DCACHE_WRITETHROUGH, + DCACHE_WRITEBACK, +}; + +/* Size of an MMU section */ +enum { + MMU_SECTION_SHIFT = 20, + MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT, +}; + +/** + * Change the cache settings for a region. + * + * \param start start address of memory region to change + * \param size size of memory region to change + * \param option dcache option to select + */ +void mmu_set_region_dcache(u32 start, int size, enum dcache_option option); + #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) |