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Date: Sun, 8 Feb 2015 16:35:42 +0100
From: Rabin Vincent <rabin@....in>
To: jesper.nilsson@...s.com
Cc: linux-cris-kernel@...s.com, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Rabin Vincent <rabin@....in>
Subject: [PATCH 1/4] CRIS: add device tree support
Add support for booting CRIS with a built-in device tree.
Signed-off-by: Rabin Vincent <rabin@....in>
---
arch/cris/Kconfig | 6 ++++++
arch/cris/Makefile | 4 ++++
arch/cris/boot/dts/Makefile | 6 ++++++
arch/cris/kernel/Makefile | 1 +
arch/cris/kernel/devicetree.c | 14 ++++++++++++++
arch/cris/kernel/setup.c | 13 +++++++++++++
6 files changed, 44 insertions(+)
create mode 100644 arch/cris/boot/dts/Makefile
create mode 100644 arch/cris/kernel/devicetree.c
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 8474c66..cbbc2dc 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -53,11 +53,17 @@ config CRIS
select OLD_SIGSUSPEND
select OLD_SIGACTION
select ARCH_REQUIRE_GPIOLIB
+ select OF
+ select OF_EARLY_FLATTREE
config HZ
int
default 100
+config BUILTIN_DTB
+ string "DTB to build into the kernel image"
+ depends on OF
+
source "init/Kconfig"
source "kernel/Kconfig.freezer"
diff --git a/arch/cris/Makefile b/arch/cris/Makefile
index 39dc7d0..4a5404b 100644
--- a/arch/cris/Makefile
+++ b/arch/cris/Makefile
@@ -40,6 +40,10 @@ else
MACH :=
endif
+ifneq ($(CONFIG_BUILTIN_DTB),"")
+core-$(CONFIG_OF) += arch/cris/boot/dts/
+endif
+
LD = $(CROSS_COMPILE)ld -mcrislinux
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
diff --git a/arch/cris/boot/dts/Makefile b/arch/cris/boot/dts/Makefile
new file mode 100644
index 0000000..faf69fb
--- /dev/null
+++ b/arch/cris/boot/dts/Makefile
@@ -0,0 +1,6 @@
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB)).dtb.o
+ifneq ($(CONFIG_BUILTIN_DTB),"")
+obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+endif
+
+clean-files := *.dtb.S
diff --git a/arch/cris/kernel/Makefile b/arch/cris/kernel/Makefile
index b45640b..edef71f 100644
--- a/arch/cris/kernel/Makefile
+++ b/arch/cris/kernel/Makefile
@@ -7,6 +7,7 @@ CPPFLAGS_vmlinux.lds := -DDRAM_VIRTUAL_BASE=0x$(CONFIG_ETRAX_DRAM_VIRTUAL_BASE)
extra-y := vmlinux.lds
obj-y := process.o traps.o irq.o ptrace.o setup.o time.o sys_cris.o
+obj-y += devicetree.o
obj-$(CONFIG_MODULES) += crisksyms.o
obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/cris/kernel/devicetree.c b/arch/cris/kernel/devicetree.c
new file mode 100644
index 0000000..53ff8d7
--- /dev/null
+++ b/arch/cris/kernel/devicetree.c
@@ -0,0 +1,14 @@
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/printk.h>
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+ pr_err("%s(%llx, %llx)\n",
+ __func__, base, size);
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+ return alloc_bootmem_align(size, align);
+}
diff --git a/arch/cris/kernel/setup.c b/arch/cris/kernel/setup.c
index 905b70e..f11538e 100644
--- a/arch/cris/kernel/setup.c
+++ b/arch/cris/kernel/setup.c
@@ -19,6 +19,9 @@
#include <linux/utsname.h>
#include <linux/pfn.h>
#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
#include <asm/setup.h>
#include <arch/system.h>
@@ -64,6 +67,8 @@ void __init setup_arch(char **cmdline_p)
unsigned long start_pfn, max_pfn;
unsigned long memory_start;
+ early_init_dt_scan(__dtb_start);
+
/* register an initial console printing routine for printk's */
init_etrax_debug();
@@ -141,6 +146,8 @@ void __init setup_arch(char **cmdline_p)
reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
+ unflatten_and_copy_device_tree();
+
/* paging_init() sets up the MMU and marks all pages as reserved */
paging_init();
@@ -204,3 +211,9 @@ static int __init topology_init(void)
subsys_initcall(topology_init);
+static int __init cris_of_init(void)
+{
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ return 0;
+}
+core_initcall(cris_of_init);
--
2.1.4
--
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