1 /* 2 * Copyright (C) 2014 Freescale Semiconductor, Inc. 3 * 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. 7 */ 8 9 #include <linux/cpuidle.h> 10 #include <linux/module.h> 11 #include <asm/cpuidle.h> 12 #include <asm/proc-fns.h> 13 14 #include "common.h" 15 #include "cpuidle.h" 16 17 static int imx6sl_enter_wait(struct cpuidle_device *dev, 18 struct cpuidle_driver *drv, int index) 19 { 20 imx6q_set_lpm(WAIT_UNCLOCKED); 21 /* 22 * Software workaround for ERR005311, see function 23 * description for details. 24 */ 25 imx6sl_set_wait_clk(true); 26 cpu_do_idle(); 27 imx6sl_set_wait_clk(false); 28 imx6q_set_lpm(WAIT_CLOCKED); 29 30 return index; 31 } 32 33 static struct cpuidle_driver imx6sl_cpuidle_driver = { 34 .name = "imx6sl_cpuidle", 35 .owner = THIS_MODULE, 36 .states = { 37 /* WFI */ 38 ARM_CPUIDLE_WFI_STATE, 39 /* WAIT */ 40 { 41 .exit_latency = 50, 42 .target_residency = 75, 43 .flags = CPUIDLE_FLAG_TIME_VALID | 44 CPUIDLE_FLAG_TIMER_STOP, 45 .enter = imx6sl_enter_wait, 46 .name = "WAIT", 47 .desc = "Clock off", 48 }, 49 }, 50 .state_count = 2, 51 .safe_state_index = 0, 52 }; 53 54 int __init imx6sl_cpuidle_init(void) 55 { 56 return cpuidle_register(&imx6sl_cpuidle_driver, NULL); 57 } 58