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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>
This commit is contained in:
Tomasz Nowicki 2016-06-10 21:55:18 +02:00 committed by Bjorn Helgaas
parent d8ed75d593
commit f058f4fbd6
1 changed files with 10 additions and 2 deletions
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12
arch/arm64/kernel/pci.c
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@ -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