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authorTomasz Nowicki <tn@semihalf.com>2016-06-10 22:55:17 +0300
committerBjorn Helgaas <bhelgaas@google.com>2016-06-11 02:29:46 +0300
commitd8ed75d593321c80ccd92f9dba218e90286bde16 (patch)
treebe6290c6e1e3b128dbbc7183d622416157ef0c39 /arch/arm64/kernel/pci.c
parent2ab51ddeca2fc32a7040d8560415be3366fa9ba7 (diff)
downloadlinux-d8ed75d593321c80ccd92f9dba218e90286bde16.tar.xz
ARM64: PCI: ACPI support for legacy IRQs parsing and consolidation with DT code
To enable PCI legacy IRQs on platforms booting with ACPI, arch code should include ACPI-specific callbacks that parse and set-up the device IRQ number, equivalent to the DT boot path. Owing to the current ACPI core scan handlers implementation, ACPI PCI legacy IRQs bindings cannot be parsed at device add time, since that would trigger ACPI scan handlers ordering issues depending on how the ACPI tables are defined. To solve this problem and consolidate FW PCI legacy IRQs parsing in one single pcibios callback (pending final removal), this patch moves DT PCI IRQ parsing to the pcibios_alloc_irq() callback (called by PCI core code at driver probe time) and adds ACPI PCI legacy IRQs parsing to the same callback too, so that FW PCI legacy IRQs parsing is confined in one single arch callback that can be easily removed when code parsing PCI legacy IRQs is consolidated and moved to core PCI code. Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/arm64/kernel/pci.c')
-rw-r--r--arch/arm64/kernel/pci.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index d5d3d26834cf..b3b8a2c68510 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -51,11 +51,16 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
}
/*
- * Try to assign the IRQ number from DT when adding a new device
+ * Try to assign the IRQ number when probing a new device
*/
-int pcibios_add_device(struct pci_dev *dev)
+int pcibios_alloc_irq(struct pci_dev *dev)
{
- dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
+ if (acpi_disabled)
+ dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
+#ifdef CONFIG_ACPI
+ else
+ return acpi_pci_irq_enable(dev);
+#endif
return 0;
}