Hey Velco,
Have you had much experience with this part?
I have a working driver for the PLX-9054. I have tested
DMA and can get it to work. But I want to iterate
to a cleaner design.
I have a pretty complete set of use-cases at
the Linux user-space end, and my DSP end. The
underlying driver implementation could be improved
without changing my interface.
The interface is:
- There is a DSP on the PCI board
- There are up to 14 boards in a crate
- The DSP writes a monitor data packet to
shared memory every 500ms
- The DSP writes a data packet to shared
memory every 100ms
- The DSP and host communicate commands
via a stdin/stdout/stderr interface
implemented in shared memory.
- The host sees the device handles
/dev/cobra_plxN - plx control registers
/dev/cobra_controlN - raw board access (mmap)
/dev/cobra_stdioN - stdin/out interface
/dev/cobra_stderrN - stderr (read-only)
/dev/cobra_monitorN - monitor packets (read-only)
/dev/cobra_dataN - data packets (read-only)
N = 0, 1, 2, 3, ...
Separate device handles are used so that the
monitor data packet catching process can use
select() on all of the boards. A timeout in
the select calls allows non-responding boards
to be ignorred. The data files are used similarly.
The stdio interface is used to implement a
'shell' on the DSP. The Linux side just reads
from the hosts stdin, writes it to the DSP
stdio device, reads the response and writes
it to the host stdout. This program does not
need to be changed. All changes happen at the
DSP end.
At the moment I'm trying to debug a sporadic problem
with handshaking between the host and the DSP....
Do you know of any other example driver code?
Thanks,
Dave Hawkins
Caltech.
> -----Original Message-----
> From: Momchil Velikov [mailto:velco@fadata.bg]
> Sent: Wednesday, November 13, 2002 1:48 AM
> To: Kirill Messel
> Cc: David Hawkins; kernelnewbies@nl.linux.org
> Subject: Re: DMA support
>
>
> >>>>> "Kirill" == Kirill Messel <kirill.messel@mtu-net.ru> writes:
>
> Kirill> Subsystem: PLX Technology, Inc.: Unknown device 9054
>
> Try http://www.plxtech.com/products/9054/default.htm
>
> ~velco
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