| /* |
| * Copyright (C) 2014 Freescale Semiconductor, Inc. |
| * |
| * 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/cpuidle.h> |
| #include <linux/cpu_pm.h> |
| #include <linux/module.h> |
| #include <asm/cpuidle.h> |
| #include <asm/suspend.h> |
| |
| #include "common.h" |
| #include "cpuidle.h" |
| |
| static int imx6sx_idle_finish(unsigned long val) |
| { |
| cpu_do_idle(); |
| |
| return 0; |
| } |
| |
| static int imx6sx_enter_wait(struct cpuidle_device *dev, |
| struct cpuidle_driver *drv, int index) |
| { |
| imx6_set_lpm(WAIT_UNCLOCKED); |
| |
| switch (index) { |
| case 1: |
| cpu_do_idle(); |
| break; |
| case 2: |
| imx6_enable_rbc(true); |
| imx_gpc_set_arm_power_in_lpm(true); |
| imx_set_cpu_jump(0, v7_cpu_resume); |
| /* Need to notify there is a cpu pm operation. */ |
| cpu_pm_enter(); |
| cpu_cluster_pm_enter(); |
| |
| cpu_suspend(0, imx6sx_idle_finish); |
| |
| cpu_cluster_pm_exit(); |
| cpu_pm_exit(); |
| imx_gpc_set_arm_power_in_lpm(false); |
| imx6_enable_rbc(false); |
| break; |
| default: |
| break; |
| } |
| |
| imx6_set_lpm(WAIT_CLOCKED); |
| |
| return index; |
| } |
| |
| static struct cpuidle_driver imx6sx_cpuidle_driver = { |
| .name = "imx6sx_cpuidle", |
| .owner = THIS_MODULE, |
| .states = { |
| /* WFI */ |
| ARM_CPUIDLE_WFI_STATE, |
| /* WAIT */ |
| { |
| .exit_latency = 50, |
| .target_residency = 75, |
| .flags = CPUIDLE_FLAG_TIMER_STOP, |
| .enter = imx6sx_enter_wait, |
| .name = "WAIT", |
| .desc = "Clock off", |
| }, |
| /* WAIT + ARM power off */ |
| { |
| /* |
| * ARM gating 31us * 5 + RBC clear 65us |
| * and some margin for SW execution, here set it |
| * to 300us. |
| */ |
| .exit_latency = 300, |
| .target_residency = 500, |
| .enter = imx6sx_enter_wait, |
| .name = "LOW-POWER-IDLE", |
| .desc = "ARM power off", |
| }, |
| }, |
| .state_count = 3, |
| .safe_state_index = 0, |
| }; |
| |
| int __init imx6sx_cpuidle_init(void) |
| { |
| imx6_set_int_mem_clk_lpm(true); |
| imx6_enable_rbc(false); |
| /* |
| * set ARM power up/down timing to the fastest, |
| * sw2iso and sw can be set to one 32K cycle = 31us |
| * except for power up sw2iso which need to be |
| * larger than LDO ramp up time. |
| */ |
| imx_gpc_set_arm_power_up_timing(2, 1); |
| imx_gpc_set_arm_power_down_timing(1, 1); |
| |
| return cpuidle_register(&imx6sx_cpuidle_driver, NULL); |
| } |