Hello all. I'm working on a driver for a custom board (based heavily on the MPC8349EMDS board) to dump data out of onboard FPGA's. I need to use the onboard DMA controller for this, mostly due to data transfer rate and timing requirements.
Of course, I'd like to "play nice" with the existing Linux infrastructure in my driver, even though I have no plans to submit the driver upstream (since it is only useful for our custom board). I have been using the DMAEngine API to interact with the DMA controller, and it works without any problems. However it seems that it is missing one of the major features that is supported by almost all DMA controllers: scatter/gather support. What I'd really like to do is give the controller a scatterlist and list of hardware addresses, and have it set up the transfer. The Freescale hardware can handle this, and I could program it by hand to do so, but I don't want to invent my own DMA API. I'm aware that the DMAEngine API was designed to offload memcpy, and pretty much nothing else. Is there any chance that such a change would be accepted into the mainline kernel? Any opinions on what such an API should look like? Thanks, Ira _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
