1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 Freescale Semiconductor, Inc. 4 */ 5 6 #include <linux/clk/imx.h> 7 #include <linux/cpuidle.h> 8 #include <linux/module.h> 9 #include <asm/cpuidle.h> 10 11 #include "common.h" 12 #include "cpuidle.h" 13 14 static __cpuidle int imx6sl_enter_wait(struct cpuidle_device *dev, 15 struct cpuidle_driver *drv, int index) 16 { 17 imx6_set_lpm(WAIT_UNCLOCKED); 18 /* 19 * Software workaround for ERR005311, see function 20 * description for details. 21 */ 22 imx6sl_set_wait_clk(true); 23 cpu_do_idle(); 24 imx6sl_set_wait_clk(false); 25 imx6_set_lpm(WAIT_CLOCKED); 26 27 return index; 28 } 29 30 static struct cpuidle_driver imx6sl_cpuidle_driver = { 31 .name = "imx6sl_cpuidle", 32 .owner = THIS_MODULE, 33 .states = { 34 /* WFI */ 35 ARM_CPUIDLE_WFI_STATE, 36 /* WAIT */ 37 { 38 .exit_latency = 50, 39 .target_residency = 75, 40 .flags = CPUIDLE_FLAG_TIMER_STOP, 41 .enter = imx6sl_enter_wait, 42 .name = "WAIT", 43 .desc = "Clock off", 44 }, 45 }, 46 .state_count = 2, 47 .safe_state_index = 0, 48 }; 49 50 int __init imx6sl_cpuidle_init(void) 51 { 52 return cpuidle_register(&imx6sl_cpuidle_driver, NULL); 53 } 54