1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2012 Calxeda, Inc. 4 * 5 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7 6 * Copyright 2012 Freescale Semiconductor, Inc. 7 * Copyright 2012 Linaro Ltd. 8 * 9 * Maintainer: Rob Herring <rob.herring@calxeda.com> 10 */ 11 12 #include <linux/cpuidle.h> 13 #include <linux/cpu_pm.h> 14 #include <linux/init.h> 15 #include <linux/mm.h> 16 #include <linux/platform_device.h> 17 #include <linux/psci.h> 18 19 #include <asm/cpuidle.h> 20 #include <asm/suspend.h> 21 22 #include <uapi/linux/psci.h> 23 24 #define CALXEDA_IDLE_PARAM \ 25 ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \ 26 (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \ 27 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT)) 28 29 static int calxeda_idle_finish(unsigned long val) 30 { 31 return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume)); 32 } 33 34 static int calxeda_pwrdown_idle(struct cpuidle_device *dev, 35 struct cpuidle_driver *drv, 36 int index) 37 { 38 cpu_pm_enter(); 39 cpu_suspend(0, calxeda_idle_finish); 40 cpu_pm_exit(); 41 42 return index; 43 } 44 45 static struct cpuidle_driver calxeda_idle_driver = { 46 .name = "calxeda_idle", 47 .states = { 48 ARM_CPUIDLE_WFI_STATE, 49 { 50 .name = "PG", 51 .desc = "Power Gate", 52 .exit_latency = 30, 53 .power_usage = 50, 54 .target_residency = 200, 55 .enter = calxeda_pwrdown_idle, 56 }, 57 }, 58 .state_count = 2, 59 }; 60 61 static int calxeda_cpuidle_probe(struct platform_device *pdev) 62 { 63 return cpuidle_register(&calxeda_idle_driver, NULL); 64 } 65 66 static struct platform_driver calxeda_cpuidle_plat_driver = { 67 .driver = { 68 .name = "cpuidle-calxeda", 69 }, 70 .probe = calxeda_cpuidle_probe, 71 }; 72 builtin_platform_driver(calxeda_cpuidle_plat_driver); 73