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CRISv32: add device tree support

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Add support for booting CRISv32 with a built-in device tree.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
This commit is contained in:
Rabin Vincent 2015-02-08 16:14:06 +01:00 committed by Jesper Nilsson
parent 43f7071e10
commit a9f75ac5a2
6 changed files with 46 additions and 0 deletions
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6
arch/cris/Kconfig
View File

@ -54,6 +54,8 @@ config CRIS
select OLD_SIGACTION
select ARCH_REQUIRE_GPIOLIB
select IRQ_DOMAIN if ETRAX_ARCH_V32
select OF if ETRAX_ARCH_V32
select OF_EARLY_FLATTREE if ETRAX_ARCH_V32
config HZ
int
@ -63,6 +65,10 @@ config NR_CPUS
int
default "1"
config BUILTIN_DTB
string "DTB to build into the kernel image"
depends on OF
source "init/Kconfig"
source "kernel/Kconfig.freezer"

4
arch/cris/Makefile
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@ -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

6
arch/cris/boot/dts/Makefile Normal file
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@ -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

1
arch/cris/kernel/Makefile
View File

@ -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

14
arch/cris/kernel/devicetree.c Normal file
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@ -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);
}

15
arch/cris/kernel/setup.c
View File

@ -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 +67,10 @@ void __init setup_arch(char **cmdline_p)
unsigned long start_pfn, max_pfn;
unsigned long memory_start;
#ifdef CONFIG_OF
early_init_dt_scan(__dtb_start);
#endif
/* register an initial console printing routine for printk's */
init_etrax_debug();
@ -141,6 +148,8 @@ 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 +213,9 @@ 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);