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143 lines
3.3 KiB
143 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2011-2014 Samsung Electronics Co., Ltd. |
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* http://www.samsung.com |
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* |
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* Coupled cpuidle support based on the work of: |
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* Colin Cross <[email protected]> |
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* Daniel Lezcano <[email protected]> |
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*/ |
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#include <linux/cpuidle.h> |
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#include <linux/cpu_pm.h> |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/of.h> |
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#include <linux/platform_data/cpuidle-exynos.h> |
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#include <asm/suspend.h> |
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#include <asm/cpuidle.h> |
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static atomic_t exynos_idle_barrier; |
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static struct cpuidle_exynos_data *exynos_cpuidle_pdata; |
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static void (*exynos_enter_aftr)(void); |
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static int exynos_enter_coupled_lowpower(struct cpuidle_device *dev, |
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struct cpuidle_driver *drv, |
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int index) |
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{ |
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int ret; |
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exynos_cpuidle_pdata->pre_enter_aftr(); |
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/* |
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* Waiting all cpus to reach this point at the same moment |
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*/ |
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cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier); |
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/* |
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* Both cpus will reach this point at the same time |
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*/ |
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ret = dev->cpu ? exynos_cpuidle_pdata->cpu1_powerdown() |
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: exynos_cpuidle_pdata->cpu0_enter_aftr(); |
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if (ret) |
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index = ret; |
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/* |
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* Waiting all cpus to finish the power sequence before going further |
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*/ |
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cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier); |
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exynos_cpuidle_pdata->post_enter_aftr(); |
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return index; |
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} |
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static int exynos_enter_lowpower(struct cpuidle_device *dev, |
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struct cpuidle_driver *drv, |
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int index) |
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{ |
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int new_index = index; |
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/* AFTR can only be entered when cores other than CPU0 are offline */ |
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if (num_online_cpus() > 1 || dev->cpu != 0) |
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new_index = drv->safe_state_index; |
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if (new_index == 0) |
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return arm_cpuidle_simple_enter(dev, drv, new_index); |
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exynos_enter_aftr(); |
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return new_index; |
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} |
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static struct cpuidle_driver exynos_idle_driver = { |
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.name = "exynos_idle", |
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.owner = THIS_MODULE, |
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.states = { |
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[0] = ARM_CPUIDLE_WFI_STATE, |
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[1] = { |
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.enter = exynos_enter_lowpower, |
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.exit_latency = 300, |
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.target_residency = 10000, |
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.name = "C1", |
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.desc = "ARM power down", |
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}, |
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}, |
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.state_count = 2, |
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.safe_state_index = 0, |
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}; |
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static struct cpuidle_driver exynos_coupled_idle_driver = { |
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.name = "exynos_coupled_idle", |
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.owner = THIS_MODULE, |
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.states = { |
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[0] = ARM_CPUIDLE_WFI_STATE, |
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[1] = { |
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.enter = exynos_enter_coupled_lowpower, |
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.exit_latency = 5000, |
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.target_residency = 10000, |
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.flags = CPUIDLE_FLAG_COUPLED | |
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CPUIDLE_FLAG_TIMER_STOP, |
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.name = "C1", |
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.desc = "ARM power down", |
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}, |
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}, |
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.state_count = 2, |
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.safe_state_index = 0, |
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}; |
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static int exynos_cpuidle_probe(struct platform_device *pdev) |
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{ |
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int ret; |
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if (IS_ENABLED(CONFIG_SMP) && |
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(of_machine_is_compatible("samsung,exynos4210") || |
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of_machine_is_compatible("samsung,exynos3250"))) { |
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exynos_cpuidle_pdata = pdev->dev.platform_data; |
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ret = cpuidle_register(&exynos_coupled_idle_driver, |
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cpu_possible_mask); |
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} else { |
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exynos_enter_aftr = (void *)(pdev->dev.platform_data); |
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ret = cpuidle_register(&exynos_idle_driver, NULL); |
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} |
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if (ret) { |
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dev_err(&pdev->dev, "failed to register cpuidle driver\n"); |
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return ret; |
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} |
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return 0; |
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} |
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static struct platform_driver exynos_cpuidle_driver = { |
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.probe = exynos_cpuidle_probe, |
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.driver = { |
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.name = "exynos_cpuidle", |
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}, |
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}; |
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builtin_platform_driver(exynos_cpuidle_driver);
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