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[POWERPC] Add function to check if address is an IO port
This adds a function that tells you if a given kernel virtual address is hitting a PCI or ISA IO port permanent mapping or not. This is to be used in the next patch to fix iomap APIs to properly unmap things. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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2 changed files with 43 additions and 0 deletions
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@ -101,6 +101,29 @@ void pcibios_free_controller(struct pci_controller *phb)
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kfree(phb);
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}
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int pcibios_vaddr_is_ioport(void __iomem *address)
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{
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int ret = 0;
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struct pci_controller *hose;
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unsigned long size;
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spin_lock(&hose_spinlock);
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list_for_each_entry(hose, &hose_list, list_node) {
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#ifdef CONFIG_PPC64
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size = hose->pci_io_size;
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#else
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size = hose->io_resource.end - hose->io_resource.start + 1;
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#endif
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if (address >= hose->io_base_virt &&
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address < (hose->io_base_virt + size)) {
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ret = 1;
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break;
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}
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}
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spin_unlock(&hose_spinlock);
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return ret;
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}
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/*
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* Return the domain number for this bus.
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*/
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@ -71,6 +71,14 @@ static inline struct pci_controller *pci_bus_to_host(struct pci_bus *bus)
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return bus->sysdata;
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}
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static inline int isa_vaddr_is_ioport(void __iomem *address)
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{
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/* No specific ISA handling on ppc32 at this stage, it
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* all goes through PCI
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*/
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return 0;
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}
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/* These are used for config access before all the PCI probing
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has been done. */
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int early_read_config_byte(struct pci_controller *hose, int bus, int dev_fn,
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@ -241,6 +249,13 @@ extern void pcibios_free_controller(struct pci_controller *phb);
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extern void isa_bridge_find_early(struct pci_controller *hose);
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static inline int isa_vaddr_is_ioport(void __iomem *address)
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{
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/* Check if address hits the reserved legacy IO range */
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unsigned long ea = (unsigned long)address;
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return ea >= ISA_IO_BASE && ea < ISA_IO_END;
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}
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extern int pcibios_unmap_io_space(struct pci_bus *bus);
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extern int pcibios_map_io_space(struct pci_bus *bus);
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@ -271,11 +286,16 @@ extern struct pci_controller *
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pcibios_alloc_controller(struct device_node *dev);
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#ifdef CONFIG_PCI
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extern unsigned long pci_address_to_pio(phys_addr_t address);
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extern int pcibios_vaddr_is_ioport(void __iomem *address);
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#else
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static inline unsigned long pci_address_to_pio(phys_addr_t address)
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{
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return (unsigned long)-1;
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}
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static inline int pcibios_vaddr_is_ioport(void __iomem *address)
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{
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return 0;
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}
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#endif
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