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ARM: Implement non-cached memory support

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Implement an API that can be used by drivers to allocate memory from a
pool that is mapped uncached. This is useful if drivers would otherwise
need to do extensive cache maintenance (or explicitly maintaining the
cache isn't safe).

The API is protected using the new CONFIG_SYS_NONCACHED_MEMORY setting.
Boards can set this to the size to be used for the non-cached area. The
area will typically be right below the malloc() area, but architectures
should take care of aligning the beginning and end of the area to honor
any mapping restrictions. Architectures must also ensure that mappings
established for this area do not overlap with the malloc() area (which
should remain cached for improved performance).

While the API is currently only implemented for ARM v7, it should be
generic enough to allow other architectures to implement it as well.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Thierry Reding
2014-12-09 22:25:22 -07:00
committed by Tom Warren
parent 6e2fca94ff
commit 1dfdd9ba4e
4 changed files with 79 additions and 0 deletions
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11
common/board_r.c
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@ -265,6 +265,14 @@ static int initr_malloc(void)
return 0;
}
#ifdef CONFIG_SYS_NONCACHED_MEMORY
static int initr_noncached(void)
{
noncached_init();
return 0;
}
#endif
#ifdef CONFIG_DM
static int initr_dm(void)
{
@ -687,6 +695,9 @@ init_fnc_t init_sequence_r[] = {
#endif
initr_barrier,
initr_malloc,
#ifdef CONFIG_SYS_NONCACHED_MEMORY
initr_noncached,
#endif
bootstage_relocate,
#ifdef CONFIG_DM
initr_dm,