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>

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