On 07/28/2014 01:09 PM, Krzysztof Sywula wrote:
Lars, I have few more questions, would love if you could answer.
- ADC I have uses max 4KHz sampling frequency, SoC CPU is 533MHz; will IIO
cope?
That's more of a hardware issue and less of a IIO framework issue. But I
think 4kHz is something that's even without DMA possible to archive without
problems.
- are there any other ADCs in IIO framework that use your DMA-extension?
Not at this point.
- I would like to use dw_dmac DMA driver, I hope both, IIO and your
DMA-extension will honour that
If the dw_dmac driver is compliant with the DMAengine API it will work out
of the box.
- what is the status of upstreaming DMA-extension? Are you commited to any
dates?
soon ;) The plan is to at least send the kernel parts after the next merge
window has closed.
- is there any out of the box set of tests for IIO/DMA-extension?
The userspace API is backwards compatible so you can use the same tools that
can be used to test other IIO applications.
- Lars
Thanks,
Krzysztof Sywula
On 07/24/2014 03:06 PM, Krzysztof Sywula wrote:
Hi there, I’m designing a PCIe driver for DMA enabled ADC. Is IIO
handling
such a combo? I'm based on kernel 3.8.7.
Website:
http://wiki.analog.com/software/linux/docs/iio/iio
says "However typical DMA operated devices such as ones connected to a
high speed synchronous serial (McBSP, SPORT) or high speed synchronous
parallel (EPI, PPI) or FPGA peripherals are also subject to this
subsystem."
which is not clear enough for me to answer that question.
Hi,
The current upstream version of IIO does not have built-in support for
DMA,
but you can always create your custom buffer implementation that handles
the
DMA.
There is a out of tree generic DMA[0] and DMAengine[1] support for IIO.
This
is both scheduled for mainline submission, but obviously will not be
available in a 3.8.7 kernel.
- Lars
[0]
https://github.com/analogdevicesinc/linux/blob/xcomm_zynq/drivers/iio/industrialio-dmabuf.c
[1]
https://github.com/analogdevicesinc/linux/blob/xcomm_zynq/drivers/iio/industrialio-dmaengine.c
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