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>
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@ -3,7 +3,7 @@ obj-y := cpu.o system.o irq-common.o
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obj-$(CONFIG_SOC_IMX1) += mm-imx1.o
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obj-$(CONFIG_SOC_IMX1) += mm-imx1.o
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obj-$(CONFIG_SOC_IMX21) += mm-imx21.o
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obj-$(CONFIG_SOC_IMX21) += mm-imx21.o
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obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o
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obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o pm-imx25.o
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obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o
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obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o
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obj-$(CONFIG_SOC_IMX27) += mm-imx27.o ehci-imx27.o
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obj-$(CONFIG_SOC_IMX27) += mm-imx27.o ehci-imx27.o
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@ -66,6 +66,7 @@ void imx_gpc_check_dt(void);
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void imx_gpc_set_arm_power_in_lpm(bool power_off);
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void imx_gpc_set_arm_power_in_lpm(bool power_off);
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void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw);
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void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw);
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void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw);
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void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw);
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void imx25_pm_init(void);
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enum mxc_cpu_pwr_mode {
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enum mxc_cpu_pwr_mode {
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WAIT_CLOCKED, /* wfi only */
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WAIT_CLOCKED, /* wfi only */
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@ -41,6 +41,7 @@ static const char * const imx25_dt_board_compat[] __initconst = {
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DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")
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DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")
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.init_early = imx25_init_early,
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.init_early = imx25_init_early,
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.init_late = imx25_pm_init,
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.init_irq = mx25_init_irq,
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.init_irq = mx25_init_irq,
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.dt_compat = imx25_dt_board_compat,
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.dt_compat = imx25_dt_board_compat,
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MACHINE_END
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MACHINE_END
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37
arch/arm/mach-imx/pm-imx25.c
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37
arch/arm/mach-imx/pm-imx25.c
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@ -0,0 +1,37 @@
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/*
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* Copyright 2016 NXP Semiconductors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/suspend.h>
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#include <linux/io.h>
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static int imx25_suspend_enter(suspend_state_t state)
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{
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if (!IS_ENABLED(CONFIG_PM))
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return 0;
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switch (state) {
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case PM_SUSPEND_MEM:
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cpu_do_idle();
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct platform_suspend_ops imx25_suspend_ops = {
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.enter = imx25_suspend_enter,
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.valid = suspend_valid_only_mem,
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};
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void __init imx25_pm_init(void)
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{
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suspend_set_ops(&imx25_suspend_ops);
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}
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