Oliver Rutsch wrote: > Hi, > > we're using a TQM5200S-Module (MPC5200) on a STK52xx-board with a > PLX9054-based PCI card. The 2.4.25-kernel on the 3.1.1 ELDK had big > problems to map the PCI resources of this card, so I tried the latest > 2.6.19.2-kernel of the 4.1 ELDK. This kernel mapped successfully the PCI > resources on this card. > After building the latest PLX driver on the 2.6.19-kernel (I had to make > some changes for the .19 kernel and for some litte/big endian issues) I > was able to transfer data with programmed I/O. But as this is too slow I > like to use the DMA functions of this device and here is the problem: > PLX provides an example program for scatter/gather DMA. This program > works with their latetst driver on a linux PC. But on the TQM5200 the > 'Channel 0 done' flag of the DMASR0 register is never set after starting > the DMA transfer. What can be the reason for this? The debug output of > the driver looks O.K., but waiting for the DMA done interrupt gives a > timeout, because the flag is not set. I wrote some test patterns in my > DMA buffer before the DMA transfer and no byte of the buffer was > altered, so the DMA engine seems not to be able to write a single byte. > Has anybody this or a similar card running on a ppc environment? Any > ideas what I can do? > > Thanks in advance and bye,
Hi, I use the PLX-9054 in my custom boards (TI DSP on-board), and Linux x86 host computer. When debugging, I load a simple memmap driver, and 'tickle' the board registers directly. There's a copy of the PLX driver in here ... http://www.ovro.caltech.edu/~dwh/correlator/pdf/cobra_driver.pdf http://www.ovro.caltech.edu/~dwh/correlator/software/cobra_driver-2.9.tar.gz And if my memory serves me right, I think I wrote a generic one that lets you map any PCI device ... http://www.ovro.caltech.edu/~dwh/correlator/pdf/LNX-723-Hawkins.pdf http://www.ovro.caltech.edu/~dwh/correlator/software/driver_design.tar.gz Anyway, manually setup a DMA transfer and convince yourself that you know which bits to twiddle, then figure out why the driver code isn't doing as its asked. Take a look at the COBRA driver code, it has PLX-9054 DMA control. There might be a few clues in my docs that'll help you. Cheers Dave _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
