MIPS: Netlogic: Add support for built in DTB

Provide a config option to embed a device tree for XLP evaluation
boards. This DTB will be used if the firmware does not pass in a
device tree pointer.

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Patchwork: http://patchwork.linux-mips.org/patch/4103/
Signed-off-by: John Crispin <blogic@openwrt.org>

4 files changed, 31 insertions, 1 deletions

diff --git a/arch/mips/netlogic/Kconfig b/arch/mips/netlogic/Kconfig
index 75bec44b5856..8059eb76f8eb 100644
--- a/arch/mips/netlogic/Kconfig
+++ b/arch/mips/netlogic/Kconfig
@@ -1,2 +1,17 @@
+if NLM_XLP_BOARD || NLM_XLR_BOARD
+
+if NLM_XLP_BOARD
+config DT_XLP_EVP
+        bool "Built-in device tree for XLP EVP/SVP boards"
+        default y
+        help
+          Add an FDT blob for XLP EVP and SVP boards into the kernel.
+          This DTB will be used if the firmware does not pass in a DTB
+          pointer to the kernel.  The corresponding DTS file is at
+          arch/mips/netlogic/dts/xlp_evp.dts
+endif
+
 config NLM_COMMON
         bool
+
+endif
diff --git a/arch/mips/netlogic/Makefile b/arch/mips/netlogic/Makefile
index 36d169b2ca6d..7602d1386614 100644
--- a/arch/mips/netlogic/Makefile
+++ b/arch/mips/netlogic/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_NLM_COMMON)        +=      common/
 obj-$(CONFIG_CPU_XLR)           +=      xlr/
 obj-$(CONFIG_CPU_XLP)           +=      xlp/
+obj-$(CONFIG_CPU_XLP)           +=      dts/
diff --git a/arch/mips/netlogic/dts/Makefile b/arch/mips/netlogic/dts/Makefile
new file mode 100644
index 000000000000..67ae3fe296f0
--- /dev/null
+++ b/arch/mips/netlogic/dts/Makefile
@@ -0,0 +1,4 @@
+obj-$(CONFIG_DT_XLP_EVP) := xlp_evp.dtb.o
+
+$(obj)/%.dtb: $(obj)/%.dts
+        $(call if_changed,dtc)
diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 0d2d679c6c56..d8997098defd 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -57,6 +57,7 @@ unsigned long nlm_common_ebase = 0x0;
 /* default to uniprocessor */
 uint32_t nlm_coremask = 1, nlm_cpumask  = 1;
 int  nlm_threads_per_core = 1;
+extern u32 __dtb_start[];
 
 static void nlm_linux_exit(void)
 {
@@ -97,9 +98,18 @@ void __init prom_init(void)
 {
         void *fdtp;
 
-        fdtp = (void *)(long)fw_arg0;
         xlp_mmu_init();
         nlm_hal_init();
+
+        /*
+         * If no FDT pointer is passed in, use the built-in FDT.
+         * device_tree_init() does not handle CKSEG0 pointers in
+         * 64-bit, so convert pointer.
+         */
+        fdtp = (void *)(long)fw_arg0;
+        if (!fdtp)
+                fdtp = __dtb_start;
+        fdtp = phys_to_virt(__pa(fdtp));
         early_init_devtree(fdtp);
 
         nlm_common_ebase = read_c0_ebase() & (~((1 << 12) - 1));