Commit b956a9e8 authored by Liviu Dudau's avatar Liviu Dudau
Browse files

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's avatarLiviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: Catalin Marinas's avatarCatalin Marinas <catalin.marinas@arm.com>
parent 00db70d5
......@@ -81,7 +81,7 @@ config MMU
def_bool y
config NO_IOPORT_MAP
def_bool y
def_bool y if !PCI
config STACKTRACE_SUPPORT
def_bool y
......@@ -156,6 +156,26 @@ menu "Bus support"
config ARM_AMBA
bool
config PCI
bool "PCI support"
help
This feature enables support for PCI bus system. If you say Y
here, the kernel will include drivers and infrastructure code
to support PCI bus devices.
config PCI_DOMAINS
def_bool PCI
config PCI_DOMAINS_GENERIC
def_bool PCI
config PCI_SYSCALL
def_bool PCI
source "drivers/pci/Kconfig"
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/hotplug/Kconfig"
endmenu
menu "Kernel Features"
......
......@@ -29,6 +29,7 @@ generic-y += mman.h
generic-y += msgbuf.h
generic-y += mutex.h
generic-y += pci.h
generic-y += pci-bridge.h
generic-y += poll.h
generic-y += preempt.h
generic-y += resource.h
......
......@@ -121,7 +121,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
/*
* I/O port access primitives.
*/
#define IO_SPACE_LIMIT 0xffff
#define arch_has_dev_port() (1)
#define IO_SPACE_LIMIT (SZ_32M - 1)
#define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M))
static inline u8 inb(unsigned long addr)
......
#ifndef __ASM_PCI_H
#define __ASM_PCI_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm-generic/pci-bridge.h>
#include <asm-generic/pci-dma-compat.h>
#define PCIBIOS_MIN_IO 0x1000
#define PCIBIOS_MIN_MEM 0
/*
* Set to 1 if the kernel should re-assign all PCI bus numbers
*/
#define pcibios_assign_all_busses() \
(pci_has_flag(PCI_REASSIGN_ALL_BUS))
/*
* PCI address space differs from physical memory address space
*/
#define PCI_DMA_BUS_IS_PHYS (0)
extern int isa_dma_bridge_buggy;
#ifdef CONFIG_PCI
static inline int pci_proc_domain(struct pci_bus *bus)
{
return 1;
}
#endif /* CONFIG_PCI */
#endif /* __KERNEL__ */
#endif /* __ASM_PCI_H */
......@@ -296,6 +296,8 @@ static inline int has_transparent_hugepage(void)
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
#define pgprot_writecombine(prot) \
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
#define pgprot_device(prot) \
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
#define __HAVE_PHYS_MEM_ACCESS_PROT
struct file;
extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
......
......@@ -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)
......
/*
* 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
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