2 * Copyright (C) 2014 Freescale Semiconductor, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/cpuidle.h>
10 #include <linux/cpu_pm.h>
11 #include <linux/module.h>
12 #include <asm/cpuidle.h>
13 #include <asm/proc-fns.h>
14 #include <asm/suspend.h>
19 static int imx6sx_idle_finish(unsigned long val
)
26 static int imx6sx_enter_wait(struct cpuidle_device
*dev
,
27 struct cpuidle_driver
*drv
, int index
)
29 imx6q_set_lpm(WAIT_UNCLOCKED
);
36 imx6_enable_rbc(true);
37 imx_gpc_set_arm_power_in_lpm(true);
38 imx_set_cpu_jump(0, v7_cpu_resume
);
39 /* Need to notify there is a cpu pm operation. */
41 cpu_cluster_pm_enter();
43 cpu_suspend(0, imx6sx_idle_finish
);
45 cpu_cluster_pm_exit();
47 imx_gpc_set_arm_power_in_lpm(false);
48 imx6_enable_rbc(false);
54 imx6q_set_lpm(WAIT_CLOCKED
);
59 static struct cpuidle_driver imx6sx_cpuidle_driver
= {
60 .name
= "imx6sx_cpuidle",
64 ARM_CPUIDLE_WFI_STATE
,
68 .target_residency
= 75,
69 .flags
= CPUIDLE_FLAG_TIMER_STOP
,
70 .enter
= imx6sx_enter_wait
,
74 /* WAIT + ARM power off */
77 * ARM gating 31us * 5 + RBC clear 65us
78 * and some margin for SW execution, here set it
82 .target_residency
= 500,
83 .enter
= imx6sx_enter_wait
,
84 .name
= "LOW-POWER-IDLE",
85 .desc
= "ARM power off",
89 .safe_state_index
= 0,
92 int __init
imx6sx_cpuidle_init(void)
94 imx6_enable_rbc(false);
96 * set ARM power up/down timing to the fastest,
97 * sw2iso and sw can be set to one 32K cycle = 31us
98 * except for power up sw2iso which need to be
99 * larger than LDO ramp up time.
101 imx_gpc_set_arm_power_up_timing(2, 1);
102 imx_gpc_set_arm_power_down_timing(1, 1);
104 return cpuidle_register(&imx6sx_cpuidle_driver
, NULL
);