[EMAIL PROTECTED] wrote:
In the Cafe driver, Linux Device Drivers 3rd Edition, and DMA-mapping.txt everyone talks about how to allocate buffers using dma/pci_alloc_coherent(), but no one talks about how to actually use it. I'm pretty sure (even in my ignorance) that just allocating a DMA coherent buffer and then copying in and out of it does NOT actually engage the underlying hardware and perform a DMA transfer.
Generally, you program the device itself to peform the transfer. I'm assuming that your custom NAND controller can't do DMA by itself, though.
With some digging I've found the Freescale Elo/Elo Plus DMA driver which supports my processor. What I'm not clear on is how to actually make use of it. How do I tie my NAND driver to the Freescale DMA driver and actually get the hardware to work? Any pointers are greatly appreciated.
Tell the DMA controller where to move data from, and where to move it to. -Scott _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
