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Message-Id: <1298405266-1624-3-git-send-email-bigeasy@linutronix.de>
Date: Tue, 22 Feb 2011 21:07:37 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: sodaville@...utronix.de, devicetree-discuss@...ts.ozlabs.org,
x86@...nel.org, Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Dirk Brandewie <dirk.brandewie@...il.com>
Subject: [PATCH 02/11] x86: Add device tree support
This patch adds minimal support for device tree support on x86. It will
be passed to the kernel via setup_data which requires atleast boot
protocol 2.09.
Memory size, restricted memory regions, boot arguments are gathered the
traditional way so things like cmd_line are just here to let the code
compile.
The current plan is use the device tree as an extension and to gather
informations from it which can not be enumerated and have to be
hardcoded otherwise. This includes things like
- which devices are on this I2C/ SPI bus?
- how are the interrupts wired to IO APIC?
- where could my hpet be?
Cc: devicetree-discuss@...ts.ozlabs.org
Acked-by: Grant Likely <grant.likely@...retlab.ca>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
---
Documentation/devicetree/booting-without-of.txt | 20 +++++++++
arch/x86/Kconfig | 7 +++
arch/x86/include/asm/bootparam.h | 1 +
arch/x86/include/asm/irq.h | 3 -
arch/x86/include/asm/prom.h | 47 ++++++++++++++++++++-
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/devicetree.c | 51 +++++++++++++++++++++++
arch/x86/kernel/irq.c | 9 ----
arch/x86/kernel/setup.c | 4 ++
9 files changed, 130 insertions(+), 13 deletions(-)
create mode 100644 arch/x86/kernel/devicetree.c
diff --git a/Documentation/devicetree/booting-without-of.txt b/Documentation/devicetree/booting-without-of.txt
index 28b1c9d..55fd262 100644
--- a/Documentation/devicetree/booting-without-of.txt
+++ b/Documentation/devicetree/booting-without-of.txt
@@ -13,6 +13,7 @@ Table of Contents
I - Introduction
1) Entry point for arch/powerpc
+ 2) Entry point for arch/x86
II - The DT block format
1) Header
@@ -225,6 +226,25 @@ it with special cases.
cannot support both configurations with Book E and configurations
with classic Powerpc architectures.
+2) Entry point for arch/x86
+-------------------------------
+
+ There is one single 32bit entry point to the kernel at code32_start,
+ the decompressor (the real mode entry point goes to the same 32bit
+ entry point once it switched into protected mode). That entry point
+ supports one calling convention which is documented in
+ Documentation/x86/boot.txt
+ The physical pointer to the device-tree block (defined in chapter II)
+ is passed via setup_data which requires at least boot protocol 2.09.
+ The type filed is defined as
+
+ #define SETUP_DTB 2
+
+ This device-tree is used as an extension to the "boot page". As such it
+ does not parse / consider data which is already covered by the boot
+ page. This includes memory size, reserved ranges, command line arguments
+ or initrd address. It simply holds information which can not be retrieved
+ otherwise like interrupt routing or a list of devices behind an I2C bus.
II - The DT block format
========================
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d5ed94d..ce7c7b9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -297,6 +297,13 @@ config X86_BIGSMP
---help---
This option is needed for the systems that have more than 8 CPUs
+config USE_OF
+ bool "Support for device tree"
+ select OF
+ select OF_EARLY_FLATTREE
+ ---help---
+ Device tree support on X86.
+
if X86_32
config X86_EXTENDED_PLATFORM
bool "Support for extended (non-PC) x86 platforms"
diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index c8bfe63..e020d88 100644
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -12,6 +12,7 @@
/* setup data types */
#define SETUP_NONE 0
#define SETUP_E820_EXT 1
+#define SETUP_DTB 2
/* extensible setup data list node */
struct setup_data {
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index c704b38..ba870bb 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -10,9 +10,6 @@
#include <asm/apicdef.h>
#include <asm/irq_vectors.h>
-/* Even though we don't support this, supply it to appease OF */
-static inline void irq_dispose_mapping(unsigned int virq) { }
-
static inline int irq_canonicalize(int irq)
{
return ((irq == 2) ? 9 : irq);
diff --git a/arch/x86/include/asm/prom.h b/arch/x86/include/asm/prom.h
index b4ec95f..841697d 100644
--- a/arch/x86/include/asm/prom.h
+++ b/arch/x86/include/asm/prom.h
@@ -1 +1,46 @@
-/* dummy prom.h; here to make linux/of.h's #includes happy */
+/*
+ * Definitions for Device tree / OpenFirmware handling on X86
+ *
+ * based on arch/powerpc/include/asm/prom.h which is
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_X86_PROM_H
+#define _ASM_X86_PROM_H
+#ifndef __ASSEMBLY__
+
+#include <linux/of.h>
+#include <linux/types.h>
+#include <asm/irq.h>
+#include <asm/atomic.h>
+#include <asm/setup.h>
+
+#ifdef CONFIG_OF
+extern void add_dtb(u64 data);
+#else
+static inline void add_dtb(u64 data) { }
+#endif
+
+extern char cmd_line[COMMAND_LINE_SIZE];
+
+#define pci_address_to_pio pci_address_to_pio
+unsigned long pci_address_to_pio(phys_addr_t addr);
+
+/**
+ * irq_dispose_mapping - Unmap an interrupt
+ * @virq: linux virq number of the interrupt to unmap
+ *
+ * FIXME: We really should implement proper virq handling like power,
+ * but that's going to be major surgery.
+ */
+static inline void irq_dispose_mapping(unsigned int virq) { }
+
+#define HAVE_ARCH_DEVTREE_FIXUPS
+
+#endif /* __ASSEMBLY__ */
+#endif
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 34244b2..6ac5036 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_MICROCODE) += microcode.o
obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
+obj-$(CONFIG_OF) += devicetree.o
###
# 64 bit specific files
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
new file mode 100644
index 0000000..b86c65e
--- /dev/null
+++ b/arch/x86/kernel/devicetree.c
@@ -0,0 +1,51 @@
+/*
+ * Architecture specific OF callbacks.
+ */
+#include <linux/bootmem.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+char __initdata cmd_line[COMMAND_LINE_SIZE];
+
+unsigned int irq_create_of_mapping(struct device_node *controller,
+ const u32 *intspec, unsigned int intsize)
+{
+ return intspec[0];
+
+}
+EXPORT_SYMBOL_GPL(irq_create_of_mapping);
+
+unsigned long pci_address_to_pio(phys_addr_t address)
+{
+ /*
+ * The ioport address can be directly used by inX / outX
+ */
+ BUG_ON(address >= (1 << 16));
+ return (unsigned long)address;
+}
+EXPORT_SYMBOL_GPL(pci_address_to_pio);
+
+void __init early_init_dt_scan_chosen_arch(unsigned long node)
+{
+ BUG();
+}
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+ BUG();
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+ return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
+}
+
+void __init add_dtb(u64 data)
+{
+ initial_boot_params = phys_to_virt((u64) (u32) data +
+ offsetof(struct setup_data, data));
+}
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 387b6a0..7531360 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -276,15 +276,6 @@ void smp_x86_platform_ipi(struct pt_regs *regs)
EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
-#ifdef CONFIG_OF
-unsigned int irq_create_of_mapping(struct device_node *controller,
- const u32 *intspec, unsigned int intsize)
-{
- return intspec[0];
-}
-EXPORT_SYMBOL_GPL(irq_create_of_mapping);
-#endif
-
#ifdef CONFIG_HOTPLUG_CPU
/* A cpu has been removed from cpu_online_mask. Reset irq affinities. */
void fixup_irqs(void)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 96cdb9c..046bcbc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -113,6 +113,7 @@
#endif
#include <asm/mce.h>
#include <asm/alternative.h>
+#include <asm/prom.h>
/*
* end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
@@ -446,6 +447,9 @@ static void __init parse_setup_data(void)
case SETUP_E820_EXT:
parse_e820_ext(data);
break;
+ case SETUP_DTB:
+ add_dtb(pa_data);
+ break;
default:
break;
}
--
1.7.4
--
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