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authorTomasz Nowicki <tn@semihalf.com>2016-06-10 22:55:18 +0300
committerBjorn Helgaas <bhelgaas@google.com>2016-06-11 02:36:19 +0300
commitf058f4fbd64028c9e9d433472cf6bcff8efdce7c (patch)
treeb5e5fe0b58be15d592f533e8c3348edc67c52e00
parentd8ed75d593321c80ccd92f9dba218e90286bde16 (diff)
downloadlinux-f058f4fbd64028c9e9d433472cf6bcff8efdce7c.tar.xz
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>
-rw-r--r--arch/arm64/kernel/pci.c12
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