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
calxeda_idle_finish(unsigned long val)29 static int calxeda_idle_finish(unsigned long val)
30 {
31 return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
32 }
33
calxeda_pwrdown_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)34 static 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
45 static 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
calxeda_cpuidle_probe(struct platform_device * pdev)61 static int calxeda_cpuidle_probe(struct platform_device *pdev)
62 {
63 return cpuidle_register(&calxeda_idle_driver, NULL);
64 }
65
66 static struct platform_driver calxeda_cpuidle_plat_driver = {
67 .driver = {
68 .name = "cpuidle-calxeda",
69 },
70 .probe = calxeda_cpuidle_probe,
71 };
72 builtin_platform_driver(calxeda_cpuidle_plat_driver);
73