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| author | Tomasz Nowicki <tn@semihalf.com> | 2016-06-10 21:55:18 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-10 18:36:19 -0500 |
| commit | f058f4fbd64028c9e9d433472cf6bcff8efdce7c (patch) | |
| tree | b5e5fe0b58be15d592f533e8c3348edc67c52e00 /arch | |
| parent | d8ed75d593321c80ccd92f9dba218e90286bde16 (diff) | |
| download | linux-f058f4fbd64028c9e9d433472cf6bcff8efdce7c.tar.gz linux-f058f4fbd64028c9e9d433472cf6bcff8efdce7c.tar.bz2 linux-f058f4fbd64028c9e9d433472cf6bcff8efdce7c.zip | |
ARM64: PCI: Implement AML accessors for PCI_Config region
On ACPI systems, the PCI_Config OperationRegion allows AML to access PCI
configuration space. The ACPI CA AML interpreter uses performs config
space accesses with acpi_os_read_pci_configuration() and
acpi_os_write_pci_configuration(), which are OS-dependent functions
supplied by acpi/osl.c.
Implement the arch-specific raw_pci_read() and raw_pci_write() interfaces
used by acpi/osl.c for PCI_Config accesses.
N.B. PCI_Config accesses are not supported before PCI bus enumeration.
[bhelgaas: changelog]
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/pci.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index b3b8a2c68510..328f85727d35 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -71,13 +71,21 @@ int pcibios_alloc_irq(struct pci_dev *dev) int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn, int reg, int len, u32 *val) { - return -ENXIO; + struct pci_bus *b = pci_find_bus(domain, bus); + + if (!b) + return PCIBIOS_DEVICE_NOT_FOUND; + return b->ops->read(b, devfn, reg, len, val); } int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn, int reg, int len, u32 val) { - return -ENXIO; + struct pci_bus *b = pci_find_bus(domain, bus); + + if (!b) + return PCIBIOS_DEVICE_NOT_FOUND; + return b->ops->write(b, devfn, reg, len, val); } #ifdef CONFIG_NUMA |