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authorLiviu Dudau2014-09-29 15:29:31 +0100
committerBjorn Helgaas2014-09-30 17:08:57 -0600
commitd1e6dc91b532d3d3dbbd0fa356b775ca320dc2c2 (patch)
tree8470f782b1a12d70ccae0ce4ea983e5977a44c50 /arch/arm64/kernel
parent8b921acfeffdb0b45085da862fc301a2d25ed2cf (diff)
arm64: Add architectural support for PCI
Use the generic PCI domain and OF functions to provide support for PCI on arm64. [bhelgaas: Change comments to use generic PCI, not just PCIe. Nothing at this level is PCIe-specific.] Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
-rw-r--r--arch/arm64/kernel/Makefile1
-rw-r--r--arch/arm64/kernel/pci.c70
2 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index df7ef8768fc2..1ed5a06a3863 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -29,6 +29,7 @@ arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
+arm64-obj-$(CONFIG_PCI) += pci.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
new file mode 100644
index 000000000000..ce5836c14ec1
--- /dev/null
+++ b/arch/arm64/kernel/pci.c
@@ -0,0 +1,70 @@
+/*
+ * Code borrowed from powerpc/kernel/pci-common.c
+ *
+ * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2014 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+#include <asm/pci-bridge.h>
+
+/*
+ * Called after each bus is probed, but before its children are examined
+ */
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+ /* nothing to do, expected to be removed in the future */
+}
+
+/*
+ * We don't have to worry about legacy ISA devices, so nothing to do here
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+ resource_size_t size, resource_size_t align)
+{
+ return res->start;
+}
+
+/*
+ * Try to assign the IRQ number from DT when adding a new device
+ */
+int pcibios_add_device(struct pci_dev *dev)
+{
+ dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
+
+ return 0;
+}
+
+
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+static bool dt_domain_found = false;
+
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+{
+ int domain = of_get_pci_domain_nr(parent->of_node);
+
+ if (domain >= 0) {
+ dt_domain_found = true;
+ } else if (dt_domain_found == true) {
+ dev_err(parent, "Node %s is missing \"linux,pci-domain\" property in DT\n",
+ parent->of_node->full_name);
+ return;
+ } else {
+ domain = pci_get_new_domain_nr();
+ }
+
+ bus->domain_nr = domain;
+}
+#endif