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| author | Liviu Dudau <Liviu.Dudau@arm.com> | 2014-09-29 15:29:21 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-09-30 09:42:45 -0600 |
| commit | 41f8bba7f5552d033583777dede2df7c36e7853d (patch) | |
| tree | 5ee6fe856a1cee69e751393fd4068c1a6b5e25e1 /include/linux/of_address.h | |
| parent | 112eeaa7f87bbd2925e919486bb504f8954fa675 (diff) | |
| download | lwn-41f8bba7f5552d033583777dede2df7c36e7853d.tar.gz lwn-41f8bba7f5552d033583777dede2df7c36e7853d.zip | |
of/pci: Add pci_register_io_range() and pci_pio_to_address()
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>
Diffstat (limited to 'include/linux/of_address.h')
| -rw-r--r-- | include/linux/of_address.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/of_address.h b/include/linux/of_address.h index fb7b7221e063..497a04356ff8 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -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) { |