[PATCH v8 9/9] pci: Remap I/O bus resources into CPU space with pci_remap_iospace()

Catalin Marinas
2014-07-14T16:54:43Z

On Tue, Jul 01, 2014 at 07:43:34PM +0100, Liviu Dudau wrote:
> Introduce a default implementation for remapping PCI bus I/O resources
> onto the CPU address space. Architectures with special needs may
> provide their own version, but most should be able to use this one.
[...]
> +/**
> + * pci_remap_iospace - Remap the memory mapped I/O space
> + * @res: Resource describing the I/O space
> + * @phys_addr: physical address where the range will be mapped.
> + *
> + * Remap the memory mapped I/O space described by the @res
> + * into the CPU physical address space. Only architectures
> + * that have memory mapped IO defined (and hence PCI_IOBASE)
> + * should call this function.
> + */
> +int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
> +{
> + int err = -ENODEV;
> +
> +#ifdef PCI_IOBASE
> + if (!(res->flags & IORESOURCE_IO))
> + return -EINVAL;
> +
> + if (res->end > IO_SPACE_LIMIT)
> + return -EINVAL;
> +
> + err = ioremap_page_range(res->start + (unsigned long)PCI_IOBASE,
> + res->end + 1 + (unsigned long)PCI_IOBASE,
> + phys_addr, __pgprot(PROT_DEVICE_nGnRE));

Except that PROT_DEVICE_nGnRE is arm64 only. I think that's a function
that should remain arch specific.

--
Catalin