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ARM: mx25: Add basic suspend/resume support 

Tested basic suspend/resume on a mx25pdk:

$ echo enabled > /sys/class/tty/ttymxc0/power/wakeup
$ echo mem > /sys/power/state

Then press any key in the serial console and the system wakes up.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Fabio Estevam 2016-02-02 19:45:38 -02:00 committed by Shawn Guo
parent c5a890a445
commit 8c4300c227
4 changed files with 40 additions and 1 deletions
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2
arch/arm/mach-imx/Makefile
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@ -3,7 +3,7 @@ obj-y := cpu.o system.o irq-common.o
obj-$(CONFIG_SOC_IMX1) += mm-imx1.o
obj-$(CONFIG_SOC_IMX21) += mm-imx21.o
obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o
obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o pm-imx25.o
obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o
obj-$(CONFIG_SOC_IMX27) += mm-imx27.o ehci-imx27.o

1
arch/arm/mach-imx/common.h
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@ -66,6 +66,7 @@ void imx_gpc_check_dt(void);
void imx_gpc_set_arm_power_in_lpm(bool power_off);
void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw);
void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw);
void imx25_pm_init(void);
enum mxc_cpu_pwr_mode {
WAIT_CLOCKED, /* wfi only */

1
arch/arm/mach-imx/mach-imx25.c
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@ -41,6 +41,7 @@ static const char * const imx25_dt_board_compat[] __initconst = {
DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")
.init_early = imx25_init_early,
.init_late = imx25_pm_init,
.init_irq = mx25_init_irq,
.dt_compat = imx25_dt_board_compat,
MACHINE_END

37
arch/arm/mach-imx/pm-imx25.c Normal file
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@ -0,0 +1,37 @@
/*
* Copyright 2016 NXP Semiconductors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
static int imx25_suspend_enter(suspend_state_t state)
{
if (!IS_ENABLED(CONFIG_PM))
return 0;
switch (state) {
case PM_SUSPEND_MEM:
cpu_do_idle();
break;
default:
return -EINVAL;
}
return 0;
}
static const struct platform_suspend_ops imx25_suspend_ops = {
.enter = imx25_suspend_enter,
.valid = suspend_valid_only_mem,
};
void __init imx25_pm_init(void)
{
suspend_set_ops(&imx25_suspend_ops);
}