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busdma: Don't sync nocache memory on ARM

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The busdma shouldn't try to flush or invalidate cache in a nocache area.
This commit is contained in:
Christian Mauderer 2020-05-27 10:08:01 +02:00
parent 36b588eb8b
commit beaacb5c30
1 changed files with 8 additions and 0 deletions
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8
rtemsbsd/rtems/rtems-kernel-bus-dma.c
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@ -48,6 +48,8 @@
#include <machine/rtems-bsd-kernel-space.h>
#include <machine/rtems-bsd-cache.h>
#include <machine/rtems-bsd-bus-dma.h>
#include <bsp.h>
#include <bsp/linker-symbols.h>
#include <rtems/malloc.h>
@ -400,6 +402,12 @@ bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
uintptr_t size = map->buffer_size;
uintptr_t begin = (uintptr_t) map->buffer_begin;
uintptr_t end = begin + size;
#ifdef __arm__
if (begin >= (uintptr_t)bsp_section_nocache_begin &&
end <= (uintptr_t)bsp_section_nocachenoload_end) {
return;
}
#endif
if ((map->flags & DMAMAP_CACHE_ALIGNED) != 0) {
begin &= ~CLMASK;