1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/renesas/common/pwrc/call_sram.S b/drivers/renesas/common/pwrc/call_sram.S
new file mode 100644
index 0000000..aa8644c
--- /dev/null
+++ b/drivers/renesas/common/pwrc/call_sram.S
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+
+.global rcar_pwrc_switch_stack
+
+/*
+ * x0 : jump address,
+ * x1 : stack address,
+ * x2 : arg,
+ * x3 : stack address (temporary)
+ */
+func rcar_pwrc_switch_stack
+
+	/* lr to stack */
+	stp	x29, x30, [sp,#-16]
+
+	/* change stack pointer */
+	mov	x3, sp
+	mov	sp, x1
+
+	/* save stack pointer */
+	sub	sp, sp, #16
+	stp	x0, x3, [sp]
+
+	/* data synchronization barrier */
+	dsb	sy
+
+	/* jump to code */
+	mov	x1, x0
+	mov	x0, x2
+	blr	x1
+
+	/* load stack pointer */
+	ldp 	x0, x2, [sp,#0]
+
+	/* change stack pointer */
+	mov	sp, x2
+
+	/* return */
+	ldp	x29, x30, [sp,#-16]
+	ret
+endfunc rcar_pwrc_switch_stack