[PATCH 22/26 v7] mips: spl: Flush cache before jumping to U-Boot proper

[Stefan Roese <sr@denx.de>]

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 <sr@denx.de>
Cc: Weijie Gao <weijie.gao@mediatek.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
---
Changes in v7:
- Moved to MIPS specific file as suggested by Daniel

Changes in v6:
- New patch

arch/mips/lib/Makefile |  1 +
 arch/mips/lib/spl.c    | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 arch/mips/lib/spl.c

diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 24a72d9c97..9ee1fcb5c7 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 0000000000..7ba3e53f6d
--- /dev/null
+++ b/arch/mips/lib/spl.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Stefan Roese <sr@denx.de>
+ */
+
+#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();
+}
-- 
2.26.2