Re: [RFC] Relaxed PIO read vs. DMA write ordering

[Grant Grundler]

On Fri, Jan 09, 2004 at 08:39:28AM +0100, Jochen Friedrich wrote:
> And there are reasons for drivers still using the pci_* API. In tms380tr,
> i support both PCI and ISA cards. The pci_* API supports mapping ISA cards
> for bus master DMA by passing a NULL for pdev. The new API still fails
> because of the BUG_ON(dev->bus != &pci_bus_type).

I don't think that's a problem of API, rather the implementation.

>  Unfortunately, on 64 bit
> platforms like Alpha, the mapping is required to set up the IOMMU.

Not just alpha.
ia64, parisc, x86_64, sparc64, mips, (and a few others) also have IO MMUs.

grant
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