[yocto] [meta-xilinx] How to include Xilinx DMA driver

[Sandeep Gundlupet Raju]

Hi Fan,

Thanks,
Sandeep


-----Original Message-----
From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Fan Zhang
Sent: Monday, September 11, 2017 9:38 AM
To: Robert Berger <yocto.user.mailinglist at gmail.com>; yocto at yoctoproject.org; meta-xilinx at yoctoproject.org
Subject: Re: [meta-xilinx] [yocto] How to include Xilinx DMA driver

Hi all

Thank you Robert for the guide. I tried option [1] out of tree driver. 
Got it compiled, and loaded when image boot up. My understand of the dma driver is that Linux DMA engine depends on the Xilinx device driver
(xilinx_cdma.c) and then dma_proxy.c driver depends on the Linux DMA engine. Am I correct?
Yes
It does seems Xilinx_cdma is loaded succefully, but dmatest didn't. Here is the message I've got:

In order to use DMATEST IP assumes AXI_DMA IP streaming interfaces are connected back to back in the HW design. Refer http://www.wiki.xilinx.com/DMA+Drivers+-+Soft+IPs 

root at microzed-zynq7:~# dmesg | grep dma
[    0.202348] dma-pl330 f8003000.dmac: Loaded driver for PL330 DMAC-241330
[    0.202370] dma-pl330 f8003000.dmac:         DBUFF-128x8bytes 
Num_Chans-8 Num_Peri-4 Num_Events-16
[    0.202654] xilinx-vdma 7e200000.dma: failed to get axi_clk (4294967294)
[    0.202679] xilinx-vdma: probe of 7e200000.dma failed with error -2
[    2.609417] xilinx-cdma 7e200000.dma: Xilinx AXI CDMA Engine driver 
Probed!!
[    2.635552] Modules linked in: axidmatest(O+) xilinx_cdma(O)
[    2.659271] PC is at xilinx_axidmatest_probe+0xd8/0x418 [axidmatest]
[    2.916646] [<bf00522c>] (xilinx_axidmatest_probe [axidmatest]) from 
[<c03905c8>] (platform_drv_probe+0x50/0xb0)
[    3.028812] udevd[674]: worker [687] failed while handling 
'/devices/soc0/dmatest at 0'

 From these message, I'm guessing there is an issue in configuration of 
the common clock framework. Is the clkc.c needs to be built as an out of 
tree module to be used in Yocto?

From 2017.1 onwards CCF is mandatory for all Xilinx drivers.
Fan

On 08/09/2017 12:20 PM, Robert Berger wrote:
> Hi,
>
> On 2017-09-08 19:00, Fan Zhang wrote:
>> Hi All,
>>
>> 1. How to include xilinx_dma.c driver in to the poky image build?
>
> In case you want to include out-of tree drivers it could work like 
> this[1] in case you want in-tree it's just a kernel patch similar to[2].
>
> Apparently you will need to turn on kernel config features. You might 
> try something like this[3].
>
> For Yocto/Xilinx specific questions you might want to ask on the 
> Xilinx mailing list[4].
>
> [1] 
> https://github.com/RobertBerger/meta-mainline/tree/pyro-training-v4.9.x/multi-v7-ml/recipes-zedboard/xilinx-dma
>
> [2] 
> https://github.com/RobertBerger/meta-mainline/blob/pyro-training-v4.9.x/multi-v7-ml/recipes-kernel/linux/patch/4.9.x/patches/zedboard-zynq7/zynq-qspi/0001-zynq-zedboard-non-mainline-qspi-support.patch
>
> [3] 
> https://github.com/RobertBerger/meta-mainline/tree/pyro-training-v4.9.x/multi-v7-ml/recipes-kernel/linux/config/multi-v7-ml-base/features/zynq-qspi
>
> [4] https://lists.yoctoproject.org/listinfo/meta-xilinx
>
> Regards,
>
> Robert
>
>