LXR linux/drivers/cpuidle/cpuidle-calxeda.c

   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);
  73