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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html