ARM: EXYNOS4: Suspend to RAM Support

This patch adds support suspend to ram for EXYNOS4210.
As a note, this includes function of outer cache flush
because it is used before entering PM.

Signed-off-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos4/sleep.S b/arch/arm/mach-exynos4/sleep.S
new file mode 100644
index 000000000000..6b62425417a6
--- /dev/null
+++ b/arch/arm/mach-exynos4/sleep.S
@@ -0,0 +1,76 @@
+/* linux/arch/arm/mach-exynos4/sleep.S
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * EXYNOS4210 power Manager (Suspend-To-RAM) support
+ * Based on S3C2410 sleep code by:
+ *	Ben Dooks, (c) 2004 Simtec Electronics
+ *
+ * Based on PXA/SA1100 sleep code by:
+ *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
+ *	Cliff Brake, (c) 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/memory.h>
+
+	.text
+
+	/*
+	 * s3c_cpu_save
+	 *
+	 * entry:
+	 *	r1 = v:p offset
+	 */
+
+ENTRY(s3c_cpu_save)
+
+	stmfd	sp!, { r3 - r12, lr }
+	ldr	r3, =resume_with_mmu
+	bl	cpu_suspend
+
+	ldr	r0, =pm_cpu_sleep
+	ldr	r0, [ r0 ]
+	mov	pc, r0
+
+resume_with_mmu:
+	ldmfd	sp!, { r3 - r12, pc }
+
+	.ltorg
+
+	/*
+	 * sleep magic, to allow the bootloader to check for an valid
+	 * image to resume to. Must be the first word before the
+	 * s3c_cpu_resume entry.
+	 */
+
+	.word	0x2bedf00d
+
+	/*
+	 * s3c_cpu_resume
+	 *
+	 * resume code entry for bootloader to call
+	 *
+	 * we must put this code here in the data segment as we have no
+	 * other way of restoring the stack pointer after sleep, and we
+	 * must not write to the code segment (code is read-only)
+	 */
+
+ENTRY(s3c_cpu_resume)
+	b	cpu_resume