Eike,
A followup on the pci_alloc_consistent. Once the hardware has
deposited data into the buffer, how do I copy out of that buffer into a
user space buffer? memcpy_fromio? Do I need to ioremap it, first?
something like;
void __iomem *hwbuf = ioremap( outmem );
memcpy_fromio( userbuf, hwbuf, size );
maybe?
--CB
I would have done it like this:
void __iomem *mem;
void *outmem;
dma_addr_t outmem_phys;
// enable device (managed mode)
pcim_enable_device(pdev);
// claim BARs
pci_request_regions(pdev, DRIVER_NAME);
// map BAR0, full size
mem = pcim_iomap(pdev, 0, 0);
// get memory that is usable by DMA
outmem = pci_alloc_consistent(pdev, PAGE_SIZE, &outmem_phys);
// tell board about it
memcpy_toio(dest + 4, &outmem_phys, sizeof(outmem_phys));
Greetings,
Eike
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