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FMC ADC 100M 14b 4cha
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  1. 23 Sep, 2020 1 commit
  3. 22 Sep, 2020 3 commits
  5. 21 Sep, 2020 12 commits
  7. 15 Sep, 2020 2 commits
  9. 14 Sep, 2020 4 commits
  11. 11 Sep, 2020 5 commits
  13. 09 Sep, 2020 4 commits
    • Federico Vaga's avatar
      drv: split DMA on mapping failure · 330caa51
      Federico Vaga authored 
      By default the SW-IOMMU reserves 64MiB, but despite this it fails in
allocating buffere bigger than 0.3MiB. We do not have control over the
kernel code, and it is not clear how to debug it (e.g. see the current
status of those 64MiB). For this reasons the most practical solution
is to break the DMA transfer in smaller chunks until it works.

We set the minimum chunk to PAGE_SIZE, because if it fails with this,
really there is nothing we can do.
Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
      330caa51
    • Federico Vaga's avatar
      drv: request DMA channel at probe · 9afa3d2e
      Federico Vaga authored 
      On SPEC each ADC has its own DMA channel which can be requested at
probe time. For SVEC, we need to request/release for every
acquisition.

In principle it is also possible for SVEC as well, but this will need
some work on the VME bridge driver to support virtual DMA
channels. And even in that case it could be tricky. Alternativelly we
could implement a share DMA channel, but it is not possible to
implement it in a clean way using the DMA engine framework.

So, this code put down the foundations for the ideal world where we
request the DMA channel once at probe time. But to support the SVEC
case there are *_svec variants in the code.
Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
      9afa3d2e
    • Federico Vaga's avatar
      drv: use local func to request/release DMA · 60f175cb
      Federico Vaga authored 
      Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
      60f175cb
    • Federico Vaga's avatar
      drv: use DMA engine error reporting · 61b4ff9c
      Federico Vaga authored 
      Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
      61b4ff9c
  15. 08 Sep, 2020 6 commits
  17. 18 Aug, 2020 1 commit
  19. 17 Aug, 2020 2 commits