1 files changed, 53 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c/sleep-s3c2412.S b/arch/arm/mach-s3c/sleep-s3c2412.S
new file mode 100644
index 000000000000..b4b61737fbb2
--- /dev/null
+++ b/arch/arm/mach-s3c/sleep-s3c2412.S
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2007 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2412 Power Manager low-level sleep support
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include "map.h"
+
+#include "regs-irq.h"
+
+	.text
+
+	.global	s3c2412_sleep_enter
+
+s3c2412_sleep_enter:
+	mov	r0, #0			/* argument for coprocessors */
+	ldr	r1, =S3C2410_INTPND
+	ldr	r2, =S3C2410_SRCPND
+	ldr	r3, =S3C2410_EINTPEND
+
+	teq	r0, r0
+	bl	s3c2412_sleep_enter1
+	teq	pc, r0
+	bl	s3c2412_sleep_enter1
+
+	.align	5
+
+	/* this is called twice, first with the Z flag to ensure that the
+	 * instructions have been loaded into the cache, and the second
+	 * time to try and suspend the system.
+	*/
+s3c2412_sleep_enter1:
+	mcr	p15, 0, r0, c7, c10, 4
+	mcrne	p15, 0, r0, c7, c0, 4
+
+	/* if we return from here, it is because an interrupt was
+	 * active when we tried to shutdown. Try and ack the IRQ and
+	 * retry, as simply returning causes the system to lock.
+	*/
+
+	ldrne	r9, [r1]
+	strne	r9, [r1]
+	ldrne	r9, [r2]
+	strne	r9, [r2]
+	ldrne	r9, [r3]
+	strne	r9, [r3]
+	bne	s3c2412_sleep_enter1
+
+	ret	lr