cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpuidle-calxeda.c (1674B)

      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
     29static int calxeda_idle_finish(unsigned long val)
     30{
     31	return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
     32}
     33
     34static 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
     45static 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
     61static int calxeda_cpuidle_probe(struct platform_device *pdev)
     62{
     63	return cpuidle_register(&calxeda_idle_driver, NULL);
     64}
     65
     66static struct platform_driver calxeda_cpuidle_plat_driver = {
     67        .driver = {
     68                .name = "cpuidle-calxeda",
     69        },
     70        .probe = calxeda_cpuidle_probe,
     71};
     72builtin_platform_driver(calxeda_cpuidle_plat_driver);