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m68k: add support for DMA_BIDIRECTIONAL in dma support functions 

The dma cache support functions do not currently support the direction flag
DMA_BIDIRECTIONAL. If a driver passes this direction to dma_map_single or
friends you will get console output like this:

  dma_sync_single_for_device: unsupported dir 0

For example when using the Intel e100 ethernet driver on a ColdFire platform
with PCI bus. You will get a stream of these messages coming out.

Modify the dma cache support code adding support for DMA_BIDIRECTIONAL. It is
actioned by doing a cache push operation.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2012-07-10 13:50:58 +10:00
parent f3ff6432dd
commit d2661c6215
1 changed files with 1 additions and 0 deletions
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1
arch/m68k/kernel/dma.c
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@ -105,6 +105,7 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
switch (dir) {
case DMA_BIDIRECTIONAL:
case DMA_TO_DEVICE:
cache_push(handle, size);
break;