From: Dinh Nguyen <Dinh.Nguyen@freescale.com>

Adds initial low power suspend functionality to MX51.
Supports "mem" and "standby" modes.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
---
 arch/arm/mach-mx5/Makefile           |    1 +
 arch/arm/mach-mx5/pm.c               |   70 ++++++++++++++++++++++++++++++++++
 arch/arm/plat-mxc/include/mach/mxc.h |    1 +
 3 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-mx5/pm.c

diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
index 026cd85..906bc71 100644
--- a/arch/arm/mach-mx5/Makefile
+++ b/arch/arm/mach-mx5/Makefile
@@ -5,6 +5,7 @@
 # Object file lists.
 obj-y   := cpu.o mm.o clock-mx51-mx53.o devices.o
 
+obj-$(CONFIG_PM) += pm.o
 obj-$(CONFIG_CPU_FREQ_IMX)    += cpu_op-mx51.o
 obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
 obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o
diff --git a/arch/arm/mach-mx5/pm.c b/arch/arm/mach-mx5/pm.c
new file mode 100644
index 0000000..417cce1
--- /dev/null
+++ b/arch/arm/mach-mx5/pm.c
@@ -0,0 +1,70 @@
+/*
+ *  Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/suspend.h>
+#include <asm/mach/map.h>
+#include <mach/system.h>
+#include "crm_regs.h"
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+	u32 plat_lpc, arm_srpgcr, ccm_clpcr;
+
+	/* always allow platform to issue a deep sleep mode request */
+	ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
+
+	switch (state) {
+	case PM_SUSPEND_MEM:
+		ccm_clpcr |= (0x2 << MXC_CCM_CLPCR_LPM_OFFSET);
+		ccm_clpcr |= (0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET);
+		ccm_clpcr |= ...
[ message continues ]

Hi Dinh,


plat_lpc and arm_srpgcr are used unitialized.


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