64bit MMIO access

[Valdis.Kletnieks at vt.edu]

On Thu, 28 Feb 2013 22:46:58 +0100, Jagath Weerasinghe said:
> What are the read/write kernel functions to access 64bit MMIO addresses?
> Are there similar functions like readl() and writel() for 64bit systems?

Are there any actual real-world cards that support 64-bit addressing
but still require MMIO?
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