[PATCH v2 0/3] dmaengine: ti-dma-crossbar: channel reserving and edma3-tpcc support
vinod.koul at intel.com
Mon Nov 30 07:18:06 PST 2015
On Fri, Oct 30, 2015 at 10:00:35AM +0200, Peter Ujfalusi wrote:
> Changes since v1:
> - Fixed issue introduced by the bitops patch: wrong error check, also switch to
> use find_first_zero_bit() instead of find_next_zero_bit()
> Cover letter:
> This series depends on the eDMA work I have done, which has been now applied:
> DRA7 family of chips have both sDMA and eDMA. Currently only sDMA can be used
> becasue the old driver stack for eDMA did not allowed integration w/o hacks.
> Due to the nature of eDMA the crossbar needs to know which eDMA events it can
> use to map incoming events towards the eDMA. In eDMA a channel is wired to be
> used with one specific event. For example eDMA event 14 can only be handled by
> eDMA channel 14.
> The eDMA itself can be shared by different processors in the system (ARM, DSP,
> etc) and since ARM/Linux is the master we need to know which channels are used
> by other cores. Also we need to mask out channels used for memcpy from the
> events we use for HW triggers.
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