[PATCH v5] i.MX27: add suspend to RAM support
Eric Bénard
eric at eukrea.com
Tue Jun 1 15:57:44 EDT 2010
Signed-off-by: Eric Bénard <eric at eukrea.com>
---
v5:
remove const struct
v4:
fixed include + const struct
v3:
return -EINVAL instead of -1
arch/arm/mach-mx2/Makefile | 2 +-
arch/arm/mach-mx2/pm-imx27.c | 46 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-mx2/pm-imx27.c
diff --git a/arch/arm/mach-mx2/Makefile b/arch/arm/mach-mx2/Makefile
index e3254fa..27d496c 100644
--- a/arch/arm/mach-mx2/Makefile
+++ b/arch/arm/mach-mx2/Makefile
@@ -8,7 +8,7 @@ obj-y := devices.o serial.o
obj-$(CONFIG_MACH_MX21) += clock_imx21.o mm-imx21.o
-obj-$(CONFIG_MACH_MX27) += cpu_imx27.o
+obj-$(CONFIG_MACH_MX27) += cpu_imx27.o pm-imx27.o
obj-$(CONFIG_MACH_MX27) += clock_imx27.o mm-imx27.o
obj-$(CONFIG_MACH_MX21ADS) += mach-mx21ads.o
diff --git a/arch/arm/mach-mx2/pm-imx27.c b/arch/arm/mach-mx2/pm-imx27.c
new file mode 100644
index 0000000..afc17ce
--- /dev/null
+++ b/arch/arm/mach-mx2/pm-imx27.c
@@ -0,0 +1,46 @@
+/*
+ * i.MX27 Power Management Routines
+ *
+ * Based on Freescale's BSP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+#include <mach/system.h>
+#include <mach/mx27.h>
+
+static int mx27_suspend_enter(suspend_state_t state)
+{
+ u32 cscr;
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ /* Clear MPEN and SPEN to disable MPLL/SPLL */
+ cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
+ cscr &= 0xFFFFFFFC;
+ __raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
+ /* Executes WFI */
+ arch_idle();
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct platform_suspend_ops mx27_suspend_ops = {
+ .enter = mx27_suspend_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+static int __init mx27_pm_init(void)
+{
+ suspend_set_ops(&mx27_suspend_ops);
+ return 0;
+}
+
+device_initcall(mx27_pm_init);
--
1.6.3.3
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