ARC: [DeviceTree] Basic support

This is minimal infrastructure needed for devicetree work.
It uses an a sample "skeleton" devicetree - embedded in kernel image -
to print the board, manufacturer by parsing the top-level "compatible"
string.

As of now we don't need any additional "board" specific "machine_desc".

TODO: support interpreting the command line as boot-loader passed dtb

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 82ac20603398..27aebd6d9513 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -13,6 +13,8 @@
 #include <linux/console.h>
 #include <linux/module.h>
 #include <linux/cpu.h>
+#include <linux/of_fdt.h>
+#include <asm/sections.h>
 #include <asm/arcregs.h>
 #include <asm/tlb.h>
 #include <asm/cache.h>
@@ -20,6 +22,7 @@
 #include <asm/page.h>
 #include <asm/irq.h>
 #include <asm/arcregs.h>
+#include <asm/prom.h>
 
 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
 
@@ -57,6 +60,8 @@ void __init __attribute__((weak)) arc_platform_early_init(void)
 
 void __init setup_arch(char **cmdline_p)
 {
+        int rc;
+
 #ifdef CONFIG_CMDLINE_UBOOT
         /* Make sure that a whitespace is inserted before */
         strlcat(command_line, " ", sizeof(command_line));
@@ -71,6 +76,8 @@ void __init setup_arch(char **cmdline_p)
         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
         *cmdline_p = command_line;
 
+        rc = setup_machine_fdt(__dtb_start);
+
         /* To force early parsing of things like mem=xxx */
         parse_early_param();
 
@@ -81,6 +88,8 @@ void __init setup_arch(char **cmdline_p)
 
         setup_arch_memory();
 
+        unflatten_device_tree();
+
         /* Can be issue if someone passes cmd line arg "ro"
          * But that is unlikely so keeping it as it is
          */