MIPS: platform: Allow for DTB to be moved during kernel relocation

Add plat_fdt_relocated(void*) API to allow the kernel relocation code to
update platform's information about the DTB location if the DTB had to
be moved due to being placed in a location used by the relocated kernel.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14611/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/mips/generic/init.c b/arch/mips/generic/init.c
index d493ccbf274a..4af619215410 100644
--- a/arch/mips/generic/init.c
+++ b/arch/mips/generic/init.c
@@ -88,6 +88,19 @@ void __init *plat_get_fdt(void)
         return (void *)fdt;
 }
 
+void __init plat_fdt_relocated(void *new_location)
+{
+        /*
+         * reset fdt as the cached value would point to the location
+         * before relocations happened and update the location argument
+         * if it was passed using UHI
+         */
+        fdt = NULL;
+
+        if (fw_arg0 == -2)
+                fw_arg1 = (unsigned long)new_location;
+}
+
 void __init plat_mem_setup(void)
 {
         if (mach && mach->fixup_fdt)