diff options
author | Liviu Dudau | 2014-09-29 15:29:31 +0100 |
---|---|---|
committer | Bjorn Helgaas | 2014-09-30 17:08:57 -0600 |
commit | d1e6dc91b532d3d3dbbd0fa356b775ca320dc2c2 (patch) | |
tree | 8470f782b1a12d70ccae0ce4ea983e5977a44c50 /arch/arm64/kernel | |
parent | 8b921acfeffdb0b45085da862fc301a2d25ed2cf (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/Makefile | 1 | ||||
-rw-r--r-- | arch/arm64/kernel/pci.c | 70 |
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 |