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(drv: &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

source code of linux/drivers/cpuidle/cpuidle-calxeda.c