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authorThierry Reding <treding@nvidia.com>2014-12-09 22:25:22 -0700
committerTom Warren <twarren@nvidia.com>2014-12-18 13:19:21 -0700
commit1dfdd9ba4e699562a3b282f4fb5efe4c80e6e8c7 (patch)
tree515aa28f47556e989774e9f4caa6d2a2ccdb61f6 /common
parent6e2fca94ff4f754024e46e7d986221a75be611f3 (diff)
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ARM: Implement non-cached memory support
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>
Diffstat (limited to 'common')
-rw-r--r--common/board_r.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/common/board_r.c b/common/board_r.c
index 4eb7a02..a301cc2 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -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,