mips: spl: Flush cache before jumping to U-Boot proper

This patch adds a MIPS specific jump_to_image_no_args() implementation,
which flushes the U-Boot proper image loaded from the boot device in
SPL before jumping to it.

It has been noticed on MT76x8, that this cache flush is needed. Other
MIPS platforms might need it as well.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Weijie Gao <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>
Cc: Simon Goldschmidt <[email protected]>
Reviewed-by: Daniel Schwierzeck <[email protected]>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 24a72d9c973..9ee1fcb5c70 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -12,5 +12,6 @@ obj-y	+= traps.o
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_CMD_GO) += boot.o
+obj-$(CONFIG_SPL_BUILD) += spl.o
 
 lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o
diff --git a/arch/mips/lib/spl.c b/arch/mips/lib/spl.c
new file mode 100644
index 00000000000..7ba3e53f6de
--- /dev/null
+++ b/arch/mips/lib/spl.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Stefan Roese <[email protected]>
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <spl.h>
+
+void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
+{
+	typedef void __noreturn (*image_entry_noargs_t)(void);
+	image_entry_noargs_t image_entry =
+		(image_entry_noargs_t)spl_image->entry_point;
+
+	/* Flush cache before jumping to application */
+	flush_cache((unsigned long)spl_image->load_addr, spl_image->size);
+
+	debug("image entry point: 0x%lx\n", spl_image->entry_point);
+	image_entry();
+}