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authorDinh Nguyen <Dinh.Nguyen@freescale.com>2011-03-28 10:14:57 -0500
committerSascha Hauer <s.hauer@pengutronix.de>2011-07-07 10:01:10 +0200
commitf9e9fc2736805fe812d9d27444f57733453386fb (patch)
tree056e68e922d9d317530cd32968cbcb587dfac12d /arch/arm/mach-mx5
parentaedc383caad3a682589e5e1b2158efed1b7f4e06 (diff)
ARM: mx51: Add support for low power suspend on MX51
Adds initial low power suspend functionality to MX51. Supports "mem" and "standby" modes. Tested on mx51-babbage. Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com> Tested-by: Arnaud Patard <arnaud.patard@rtp-net.org> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mx5')
-rw-r--r--arch/arm/mach-mx5/Makefile1
-rw-r--r--arch/arm/mach-mx5/pm-imx5.c73
2 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
index df67fefdc6c..383e7cd3fbc 100644
--- a/arch/arm/mach-mx5/Makefile
+++ b/arch/arm/mach-mx5/Makefile
@@ -6,6 +6,7 @@
obj-y := cpu.o mm.o clock-mx51-mx53.o devices.o ehci.o system.o
obj-$(CONFIG_SOC_IMX50) += mm-mx50.o
+obj-$(CONFIG_PM) += pm-imx5.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-imx5.c b/arch/arm/mach-mx5/pm-imx5.c
new file mode 100644
index 00000000000..e4529af0da7
--- /dev/null
+++ b/arch/arm/mach-mx5/pm-imx5.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2011 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 <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <mach/system.h>
+#include "crm_regs.h"
+
+static struct clk *gpc_dvfs_clk;
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+ clk_enable(gpc_dvfs_clk);
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ mx5_cpu_lp_set(STOP_POWER_OFF);
+ break;
+ case PM_SUSPEND_STANDBY:
+ mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (state == PM_SUSPEND_MEM) {
+ local_flush_tlb_all();
+ flush_cache_all();
+
+ /*clear the EMPGC0/1 bits */
+ __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
+ __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
+ }
+ cpu_do_idle();
+ clk_disable(gpc_dvfs_clk);
+
+ return 0;
+}
+
+static int mx5_pm_valid(suspend_state_t state)
+{
+ return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
+}
+
+static const struct platform_suspend_ops mx5_suspend_ops = {
+ .valid = mx5_pm_valid,
+ .enter = mx5_suspend_enter,
+};
+
+static int __init mx5_pm_init(void)
+{
+ if (gpc_dvfs_clk == NULL)
+ gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
+
+ if (!IS_ERR(gpc_dvfs_clk)) {
+ if (cpu_is_mx51())
+ suspend_set_ops(&mx5_suspend_ops);
+ } else
+ return -EPERM;
+
+ return 0;
+}
+device_initcall(mx5_pm_init);