cpuidle-big_little.c revision 64a3c4caa91c72a00ba2e464a0b2a0a5ce7a312b
114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi/* 214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Copyright (c) 2013 ARM/Linaro 314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Authors: Daniel Lezcano <daniel.lezcano@linaro.org> 514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> 614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Nicolas Pitre <nicolas.pitre@linaro.org> 714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * This program is free software; you can redistribute it and/or modify 914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * it under the terms of the GNU General Public License version 2 as 1014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * published by the Free Software Foundation. 1114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 1214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Maintainer: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> 1314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Maintainer: Daniel Lezcano <daniel.lezcano@linaro.org> 1414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 1514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <linux/cpuidle.h> 1614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <linux/cpu_pm.h> 1714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <linux/slab.h> 1814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <linux/of.h> 1914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 2014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/cpu.h> 2114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/cputype.h> 2214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/cpuidle.h> 2314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/mcpm.h> 2414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/smp_plat.h> 2514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi#include <asm/suspend.h> 2614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 2714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic int bl_enter_powerdown(struct cpuidle_device *dev, 2814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi struct cpuidle_driver *drv, int idx); 2914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 3014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi/* 3114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * NB: Owing to current menu governor behaviour big and LITTLE 3214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * index 1 states have to define exit_latency and target_residency for 3314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * cluster state since, when all CPUs in a cluster hit it, the cluster 3414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * can be shutdown. This means that when a single CPU enters this state 3514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * the exit_latency and target_residency values are somewhat overkill. 3614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * There is no notion of cluster states in the menu governor, so CPUs 3714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * have to define CPU states where possibly the cluster will be shutdown 3814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * depending on the state of other CPUs. idle states entry and exit happen 3914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * at random times; however the cluster state provides target_residency 4014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * values as if all CPUs in a cluster enter the state at once; this is 4114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * somewhat optimistic and behaviour should be fixed either in the governor 4214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * or in the MCPM back-ends. 4314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * To make this driver 100% generic the number of states and the exit_latency 4414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * target_residency values must be obtained from device tree bindings. 4514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 4614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * exit_latency: refers to the TC2 vexpress test chip and depends on the 4714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * current cluster operating point. It is the time it takes to get the CPU 4814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * up and running when the CPU is powered up on cluster wake-up from shutdown. 4914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Current values for big and LITTLE clusters are provided for clusters 5014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * running at default operating points. 5114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 5214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * target_residency: it is the minimum amount of time the cluster has 5314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * to be down to break even in terms of power consumption. cluster 5414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * shutdown has inherent dynamic power costs (L2 writebacks to DRAM 5514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * being the main factor) that depend on the current operating points. 5614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * The current values for both clusters are provided for a CPU whose half 5714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * of L2 lines are dirty and require cleaning to DRAM, and takes into 5814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * account leakage static power values related to the vexpress TC2 testchip. 5914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 6014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic struct cpuidle_driver bl_idle_little_driver = { 6114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .name = "little_idle", 6214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .owner = THIS_MODULE, 6314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .states[0] = ARM_CPUIDLE_WFI_STATE, 6414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .states[1] = { 6514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .enter = bl_enter_powerdown, 6614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .exit_latency = 700, 6714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .target_residency = 2500, 6814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .flags = CPUIDLE_FLAG_TIME_VALID | 6914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi CPUIDLE_FLAG_TIMER_STOP, 7014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .name = "C1", 7114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .desc = "ARM little-cluster power down", 7214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi }, 7314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .state_count = 2, 7414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi}; 7514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 7614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic struct cpuidle_driver bl_idle_big_driver = { 7714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .name = "big_idle", 7814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .owner = THIS_MODULE, 7914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .states[0] = ARM_CPUIDLE_WFI_STATE, 8014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .states[1] = { 8114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .enter = bl_enter_powerdown, 8214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .exit_latency = 500, 8314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .target_residency = 2000, 8414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .flags = CPUIDLE_FLAG_TIME_VALID | 8514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi CPUIDLE_FLAG_TIMER_STOP, 8614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .name = "C1", 8714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .desc = "ARM big-cluster power down", 8814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi }, 8914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi .state_count = 2, 9014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi}; 9114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 9214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi/* 9314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * notrace prevents trace shims from getting inserted where they 9414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * should not. Global jumps and ldrex/strex must not be inserted 9514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * in power down sequences where caches and MMU may be turned off. 9614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 9714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic int notrace bl_powerdown_finisher(unsigned long arg) 9814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi{ 9914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* MCPM works with HW CPU identifiers */ 10014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi unsigned int mpidr = read_cpuid_mpidr(); 10114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 10214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 10314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 10414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi mcpm_set_entry_vector(cpu, cluster, cpu_resume); 10514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 10614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* 10714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Residency value passed to mcpm_cpu_suspend back-end 10814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * has to be given clear semantics. Set to 0 as a 10914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * temporary value. 11014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 11114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi mcpm_cpu_suspend(0); 11214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 11314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* return value != 0 means failure */ 11414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return 1; 11514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi} 11614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 11714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi/** 11814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * bl_enter_powerdown - Programs CPU to enter the specified state 11914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * @dev: cpuidle device 12014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * @drv: The target state to be programmed 12114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * @idx: state index 12214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * 12314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Called from the CPUidle framework to program the device to the 12414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * specified target state selected by the governor. 12514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 12614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic int bl_enter_powerdown(struct cpuidle_device *dev, 12714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi struct cpuidle_driver *drv, int idx) 12814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi{ 12914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpu_pm_enter(); 13014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 13114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpu_suspend(0, bl_powerdown_finisher); 13214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 13314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* signals the MCPM core that CPU is out of low power state */ 13414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi mcpm_cpu_powered_up(); 13514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 13614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpu_pm_exit(); 13714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 13814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return idx; 13914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi} 14014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 14114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic int __init bl_idle_driver_init(struct cpuidle_driver *drv, int cpu_id) 14214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi{ 14314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi struct cpuinfo_arm *cpu_info; 14414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi struct cpumask *cpumask; 14514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi unsigned long cpuid; 14614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi int cpu; 14714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 14814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpumask = kzalloc(cpumask_size(), GFP_KERNEL); 14914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if (!cpumask) 15014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return -ENOMEM; 15114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 15214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi for_each_possible_cpu(cpu) { 15314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpu_info = &per_cpu(cpu_data, cpu); 15414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpuid = is_smp() ? cpu_info->cpuid : read_cpuid_id(); 15514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 15614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* read cpu id part number */ 15714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if ((cpuid & 0xFFF0) == cpu_id) 15814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpumask_set_cpu(cpu, cpumask); 15914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi } 16014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 16114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi drv->cpumask = cpumask; 16214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 16314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return 0; 16414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi} 16514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 166e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyapstatic const struct of_device_id compatible_machine_match[] = { 167e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap { .compatible = "arm,vexpress,v2p-ca15_a7" }, 16864a3c4caa91c72a00ba2e464a0b2a0a5ce7a312bChander Kashyap { .compatible = "samsung,exynos5420" }, 169e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap {}, 170e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap}; 171e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap 17214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisistatic int __init bl_idle_init(void) 17314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi{ 17414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi int ret; 175e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap struct device_node *root = of_find_node_by_path("/"); 176e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap 177e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap if (!root) 178e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap return -ENODEV; 17914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 18014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* 18114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * Initialize the driver just for a compliant set of machines 18214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 183e2e54362d9c8c1e8d52ff576a4e0f6e61f569356Chander Kashyap if (!of_match_node(compatible_machine_match, root)) 18414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return -ENODEV; 18514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi /* 18614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * For now the differentiation between little and big cores 18714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * is based on the part number. A7 cores are considered little 18814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * cores, A15 are considered big cores. This distinction may 18914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi * evolve in the future with a more generic matching approach. 19014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi */ 19114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi ret = bl_idle_driver_init(&bl_idle_little_driver, 19214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi ARM_CPU_PART_CORTEX_A7); 19314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if (ret) 19414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return ret; 19514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 19614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi ret = bl_idle_driver_init(&bl_idle_big_driver, ARM_CPU_PART_CORTEX_A15); 19714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if (ret) 19814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi goto out_uninit_little; 19914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 20014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi ret = cpuidle_register(&bl_idle_little_driver, NULL); 20114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if (ret) 20214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi goto out_uninit_big; 20314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 20414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi ret = cpuidle_register(&bl_idle_big_driver, NULL); 20514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi if (ret) 20614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi goto out_unregister_little; 20714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 20814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return 0; 20914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 21014d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisiout_unregister_little: 21114d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi cpuidle_unregister(&bl_idle_little_driver); 21214d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisiout_uninit_big: 21314d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi kfree(bl_idle_big_driver.cpumask); 21414d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisiout_uninit_little: 21514d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi kfree(bl_idle_little_driver.cpumask); 21614d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi 21714d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi return ret; 21814d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisi} 21914d2c34cfa0026ba3916f5d5b2f1ad433beeef5aLorenzo Pieralisidevice_initcall(bl_idle_init); 220