1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2012 Calxeda, Inc.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
6*4882a593Smuzhiyun * Copyright 2012 Freescale Semiconductor, Inc.
7*4882a593Smuzhiyun * Copyright 2012 Linaro Ltd.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Maintainer: Rob Herring <rob.herring@calxeda.com>
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/cpuidle.h>
13*4882a593Smuzhiyun #include <linux/cpu_pm.h>
14*4882a593Smuzhiyun #include <linux/init.h>
15*4882a593Smuzhiyun #include <linux/mm.h>
16*4882a593Smuzhiyun #include <linux/platform_device.h>
17*4882a593Smuzhiyun #include <linux/psci.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <asm/cpuidle.h>
20*4882a593Smuzhiyun #include <asm/suspend.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include <uapi/linux/psci.h>
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define CALXEDA_IDLE_PARAM \
25*4882a593Smuzhiyun ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
26*4882a593Smuzhiyun (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
27*4882a593Smuzhiyun (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
28*4882a593Smuzhiyun
calxeda_idle_finish(unsigned long val)29*4882a593Smuzhiyun static int calxeda_idle_finish(unsigned long val)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
calxeda_pwrdown_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)34*4882a593Smuzhiyun static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
35*4882a593Smuzhiyun struct cpuidle_driver *drv,
36*4882a593Smuzhiyun int index)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun cpu_pm_enter();
39*4882a593Smuzhiyun cpu_suspend(0, calxeda_idle_finish);
40*4882a593Smuzhiyun cpu_pm_exit();
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return index;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun static struct cpuidle_driver calxeda_idle_driver = {
46*4882a593Smuzhiyun .name = "calxeda_idle",
47*4882a593Smuzhiyun .states = {
48*4882a593Smuzhiyun ARM_CPUIDLE_WFI_STATE,
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun .name = "PG",
51*4882a593Smuzhiyun .desc = "Power Gate",
52*4882a593Smuzhiyun .exit_latency = 30,
53*4882a593Smuzhiyun .power_usage = 50,
54*4882a593Smuzhiyun .target_residency = 200,
55*4882a593Smuzhiyun .enter = calxeda_pwrdown_idle,
56*4882a593Smuzhiyun },
57*4882a593Smuzhiyun },
58*4882a593Smuzhiyun .state_count = 2,
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun
calxeda_cpuidle_probe(struct platform_device * pdev)61*4882a593Smuzhiyun static int calxeda_cpuidle_probe(struct platform_device *pdev)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun return cpuidle_register(&calxeda_idle_driver, NULL);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static struct platform_driver calxeda_cpuidle_plat_driver = {
67*4882a593Smuzhiyun .driver = {
68*4882a593Smuzhiyun .name = "cpuidle-calxeda",
69*4882a593Smuzhiyun },
70*4882a593Smuzhiyun .probe = calxeda_cpuidle_probe,
71*4882a593Smuzhiyun };
72*4882a593Smuzhiyun builtin_platform_driver(calxeda_cpuidle_plat_driver);
73