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Message-ID: <1444804304-5213-5-git-send-email-lftan@altera.com>
Date: Wed, 14 Oct 2015 14:31:44 +0800
From: Ley Foon Tan <lftan@...era.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>
CC: <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
<linux-pci@...r.kernel.org>, Ley Foon Tan <lftan@...era.com>,
<lftan.linux@...il.com>
Subject: [PATCH v2 4/4] nios2: Add architectural support for PCIe
This patch add pcie support on nios2 platform.
Signed-off-by: Ley Foon Tan <lftan@...era.com>
---
arch/nios2/Kconfig | 21 +++++++++++++++++++++
arch/nios2/include/asm/Kbuild | 1 +
arch/nios2/include/asm/io.h | 12 ++++++++++--
arch/nios2/kernel/Makefile | 1 +
arch/nios2/kernel/pci.c | 33 +++++++++++++++++++++++++++++++++
5 files changed, 66 insertions(+), 2 deletions(-)
create mode 100644 arch/nios2/kernel/pci.c
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 4375554..bde323f 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -11,6 +11,7 @@ config NIOS2
select HAVE_ARCH_KGDB
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
+ select MIGHT_HAVE_PCI
select OF
select OF_EARLY_FLATTREE
select SOC_BUS
@@ -194,6 +195,26 @@ config NIOS2_IO_REGION_BASE
endmenu
+menu "Bus support"
+config PCI
+ bool "PCI support"
+ select GENERIC_PCI_IOMAP
+ 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_DOMAINS_GENERIC
+ def_bool PCI
+
+source "drivers/pci/Kconfig"
+source "drivers/pci/pcie/Kconfig"
+
+endmenu
+
menu "Executable file formats"
source "fs/Kconfig.binfmt"
diff --git a/arch/nios2/include/asm/Kbuild b/arch/nios2/include/asm/Kbuild
index d63330e..a7cace1 100644
--- a/arch/nios2/include/asm/Kbuild
+++ b/arch/nios2/include/asm/Kbuild
@@ -34,6 +34,7 @@ generic-y += mm-arch-hooks.h
generic-y += mman.h
generic-y += module.h
generic-y += msgbuf.h
+generic-y += msi.h
generic-y += param.h
generic-y += pci.h
generic-y += percpu.h
diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index c5a62da..0ba8388 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -14,8 +14,7 @@
#include <linux/types.h>
#include <asm/pgtable-bits.h>
-/* PCI is not supported in nios2, set this to 0. */
-#define IO_SPACE_LIMIT 0
+#define IO_SPACE_LIMIT 0xffff
#define readb_relaxed(addr) readb(addr)
#define readw_relaxed(addr) readw(addr)
@@ -45,6 +44,15 @@ static inline void iounmap(void __iomem *addr)
__iounmap(addr);
}
+static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+ return NULL;
+}
+
+static inline void ioport_unmap(void __iomem *p)
+{
+}
+
#define ioremap_wc ioremap_nocache
#define ioremap_wt ioremap_nocache
diff --git a/arch/nios2/kernel/Makefile b/arch/nios2/kernel/Makefile
index 1aae257..bb1ef81 100644
--- a/arch/nios2/kernel/Makefile
+++ b/arch/nios2/kernel/Makefile
@@ -10,6 +10,7 @@ obj-y += entry.o
obj-y += insnemu.o
obj-y += irq.o
obj-y += nios2_ksyms.o
+obj-y += pci.o
obj-y += process.o
obj-y += prom.o
obj-y += ptrace.o
diff --git a/arch/nios2/kernel/pci.c b/arch/nios2/kernel/pci.c
new file mode 100644
index 0000000..d28aed7
--- /dev/null
+++ b/arch/nios2/kernel/pci.c
@@ -0,0 +1,33 @@
+/* Copyright Altera Corporation (C) 2015. All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <linux/pci.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;
+}
--
1.8.2.1
--
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