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of/pci: Add pci_register_io_range() and pci_pio_to_address()

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Some architectures do not have a simple view of the PCI I/O space and
instead use a range of CPU addresses that map to bus addresses.  For some
architectures these ranges will be expressed by OF bindings in a device
tree file.

This patch introduces a pci_register_io_range() helper function with a
generic implementation that can be used by such architectures to keep track
of the I/O ranges described by the PCI bindings.  If the PCI_IOBASE macro
is not defined, that signals lack of support for PCI and we return an
error.

In order to retrieve the CPU address associated with an I/O port, a new
helper function pci_pio_to_address() is introduced.  This will search in
the list of ranges registered with pci_register_io_range() and return the
CPU address that corresponds to the given port.

[arnd: add dummy !CONFIG_OF pci_pio_to_address() to fix build errors]
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
CC: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Liviu Dudau
2014-09-29 15:29:21 +01:00
committed by Bjorn Helgaas
parent 112eeaa7f8
commit 41f8bba7f5
2 changed files with 116 additions and 0 deletions
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7
include/linux/of_address.h
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@@ -55,7 +55,9 @@ extern void __iomem *of_iomap(struct device_node *device, int index);
extern const __be32 *of_get_address(struct device_node *dev, int index,
u64 *size, unsigned int *flags);
extern int pci_register_io_range(phys_addr_t addr, resource_size_t size);
extern unsigned long pci_address_to_pio(phys_addr_t addr);
extern phys_addr_t pci_pio_to_address(unsigned long pio);
extern int of_pci_range_parser_init(struct of_pci_range_parser *parser,
struct device_node *node);
@@ -80,6 +82,11 @@ static inline const __be32 *of_get_address(struct device_node *dev, int index,
return NULL;
}
static inline phys_addr_t pci_pio_to_address(unsigned long pio)
{
return 0;
}
static inline int of_pci_range_parser_init(struct of_pci_range_parser *parser,
struct device_node *node)
{