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PCI: add generic pcibios_resource_to_bus() 

This replaces the generic versions of pcibios_resource_to_bus() and
pcibios_bus_to_resource() in asm-generic/pci.h with versions that use
pci_resource_to_bus() and pci_bus_to_resource().

The replacements are equivalent except that they can apply host
bridge window offsets when the arch has supplied them by using
pci_add_resource_offset().

Each arch can convert to using pci_add_resource_offset() individually by
removing its device resource fixups from pcibios_fixup_bus() and supplying
ARCH_HAS_GENERIC_PCI_OFFSETS.  ARCH_HAS_GENERIC_PCI_OFFSETS can be removed
after all have converted.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
hifive-unleashed-5.1
Bjorn Helgaas 2012-02-23 20:19:00 -07:00
parent 5bfa14ed9f
commit 36a66cd6fd
3 changed files with 21 additions and 23 deletions
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16
drivers/pci/probe.c
View File

@ -118,6 +118,22 @@ void pci_bus_to_resource(struct pci_dev *dev, struct resource *res,
res->end = region->end + offset;
}
#ifdef ARCH_HAS_GENERIC_PCI_OFFSETS
void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res)
{
pci_resource_to_bus(dev, region, res);
}
EXPORT_SYMBOL(pcibios_resource_to_bus);
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
pci_bus_to_resource(dev, res, region);
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
#endif
/*
* PCI Bus Class
*/

24
include/asm-generic/pci.h
View File

@ -6,29 +6,7 @@
#ifndef _ASM_GENERIC_PCI_H
#define _ASM_GENERIC_PCI_H
/**
* pcibios_resource_to_bus - convert resource to PCI bus address
* @dev: device which owns this resource
* @region: converted bus-centric region (start,end)
* @res: resource to convert
*
* Convert a resource to a PCI device bus address or bus window.
*/
static inline void
pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res)
{
region->start = res->start;
region->end = res->end;
}
static inline void
pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
res->start = region->start;
res->end = region->end;
}
#define ARCH_HAS_GENERIC_PCI_OFFSETS
static inline struct resource *
pcibios_select_root(struct pci_dev *pdev, struct resource *res)

4
include/linux/pci.h
View File

@ -648,6 +648,10 @@ void pci_fixup_cardbus(struct pci_bus *);
/* Generic PCI functions used internally */
void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res);
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region);
void pcibios_scan_specific_bus(int busn);
extern struct pci_bus *pci_find_bus(int domain, int busnr);
void pci_bus_add_devices(const struct pci_bus *bus);