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.
Signed-off-by: Liviu Dudau Liviu.Dudau@arm.com --- drivers/pci/pci.c | 33 +++++++++++++++++++++++++++++++++ include/linux/pci.h | 3 +++ 2 files changed, 36 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 8e65dc3..a90df97 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2708,6 +2708,39 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) } EXPORT_SYMBOL(pci_request_regions_exclusive);
+/** + * 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)); +#else + /* this architecture does not have memory mapped I/O space, + so this function should never be called */ + WARN_ON(1); +#endif + + return err; +} + static void __pci_set_master(struct pci_dev *dev, bool enable) { u16 old_cmd, cmd; diff --git a/include/linux/pci.h b/include/linux/pci.h index 556dc5f..65fb1fc 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1100,6 +1100,9 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus, resource_size_t), void *alignf_data);
+ +int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr); + static inline dma_addr_t pci_bus_address(struct pci_dev *pdev, int bar) { struct pci_bus_region region;