From 1dfdd9ba4e699562a3b282f4fb5efe4c80e6e8c7 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 9 Dec 2014 22:25:22 -0700 Subject: 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 Signed-off-by: Simon Glass Signed-off-by: Tom Warren --- common/board_r.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'common/board_r.c') diff --git a/common/board_r.c b/common/board_r.c index 4eb7a023d4..a301cc226f 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, -- cgit v1.2.1