diff options
| author | Eric Bénard <eric@eukrea.com> | 2010-06-01 21:57:44 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-07-26 14:18:05 +0200 |
| commit | f42ae0e9f4996308860d5cee4803337d3ce3c4ae (patch) | |
| tree | 38934184ffd617e62df8b14e9e63b192ccf5ed98 /arch | |
| parent | e8c74860a724c714fbf041a779d7cfd147145b6f (diff) | |
i.MX27: add suspend to RAM support
Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-mx2/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-mx2/pm-imx27.c | 46 |
2 files changed, 47 insertions, 1 deletions
diff --git a/arch/arm/mach-mx2/Makefile b/arch/arm/mach-mx2/Makefile index e3254faac82..27d496c3e5c 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 00000000000..afc17ce0bb5 --- /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); |