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Message-Id: <1404240240-9856-2-git-send-email-Liviu.Dudau@arm.com>
Date: Tue, 1 Jul 2014 19:44:00 +0100
From: Liviu Dudau <Liviu.Dudau@....com>
To: linux-pci <linux-pci@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Catalin Marinas <Catalin.Marinas@....com>,
Will Deacon <Will.Deacon@....com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Arnd Bergmann <arnd@...db.de>,
linaro-kernel <linaro-kernel@...ts.linaro.org>,
Tanmay Inamdar <tinamdar@....com>,
Grant Likely <grant.likely@...retlab.ca>,
Sinan Kaya <okaya@...eaurora.org>,
Jingoo Han <jg1.han@...sung.com>,
Kukjin Kim <kgene.kim@...sung.com>,
Suravee Suthikulanit <suravee.suthikulpanit@....com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Device Tree ML <devicetree@...r.kernel.org>,
LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] arm64: Add architectural support for PCI
Use the generic host bridge functions to provide support for
PCI Express on arm64.
Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
---
arch/arm64/Kconfig | 19 ++++++++++++++++-
arch/arm64/include/asm/Kbuild | 1 +
arch/arm64/include/asm/io.h | 3 ++-
arch/arm64/include/asm/pci.h | 49 +++++++++++++++++++++++++++++++++++++++++++
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/pci.c | 38 +++++++++++++++++++++++++++++++++
6 files changed, 109 insertions(+), 2 deletions(-)
create mode 100644 arch/arm64/include/asm/pci.h
create mode 100644 arch/arm64/kernel/pci.c
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a474de34..48ed631 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -75,7 +75,7 @@ config MMU
def_bool y
config NO_IOPORT_MAP
- def_bool y
+ def_bool y if !PCI
config STACKTRACE_SUPPORT
def_bool y
@@ -150,6 +150,23 @@ menu "Bus support"
config ARM_AMBA
bool
+config PCI
+ bool "PCI support"
+ help
+ This feature enables support for PCIe bus system. If you say Y
+ here, the kernel will include drivers and infrastructure code
+ to support PCIe bus devices.
+
+config PCI_DOMAINS
+ 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"
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 0b3fcf8..07cb417 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -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
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index e0ecdcf..dc34039 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.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 0x1ffffff
#define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M))
static inline u8 inb(unsigned long addr)
diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
new file mode 100644
index 0000000..3f7856e
--- /dev/null
+++ b/arch/arm64/include/asm/pci.h
@@ -0,0 +1,49 @@
+#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
+
+struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus);
+
+/*
+ * 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_domain_nr(struct pci_bus *bus)
+{
+ struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
+
+ if (bridge)
+ return bridge->domain_nr;
+
+ return 0;
+}
+
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+ return 1;
+}
+#endif /* CONFIG_PCI */
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_PCI_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index cdaedad..36b117a 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 0000000..955d6d1
--- /dev/null
+++ b/arch/arm64/kernel/pci.c
@@ -0,0 +1,38 @@
+/*
+ * Code borrowed from powerpc/kernel/pci-common.c
+ *
+ * Copyright (C) 2003 Anton Blanchard <anton@...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;
+}
--
2.0.0
--
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