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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
be6a98d3 RH |
2 | /* |
3 | * Copyright 2012 Calxeda, Inc. | |
4 | * | |
a8e39c35 | 5 | * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7 |
be6a98d3 RH |
6 | * Copyright 2012 Freescale Semiconductor, Inc. |
7 | * Copyright 2012 Linaro Ltd. | |
8 | * | |
a8e39c35 | 9 | * Maintainer: Rob Herring <rob.herring@calxeda.com> |
be6a98d3 RH |
10 | */ |
11 | ||
12 | #include <linux/cpuidle.h> | |
34a5eeb2 | 13 | #include <linux/cpu_pm.h> |
be6a98d3 | 14 | #include <linux/init.h> |
a410146c | 15 | #include <linux/mm.h> |
60a66e37 | 16 | #include <linux/platform_device.h> |
be120397 MR |
17 | #include <linux/psci.h> |
18 | ||
be6a98d3 | 19 | #include <asm/cpuidle.h> |
be6a98d3 | 20 | #include <asm/suspend.h> |
be120397 MR |
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)) | |
be6a98d3 RH |
28 | |
29 | static int calxeda_idle_finish(unsigned long val) | |
30 | { | |
be120397 | 31 | return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume)); |
be6a98d3 RH |
32 | } |
33 | ||
34 | static int calxeda_pwrdown_idle(struct cpuidle_device *dev, | |
35 | struct cpuidle_driver *drv, | |
36 | int index) | |
37 | { | |
34a5eeb2 | 38 | cpu_pm_enter(); |
be6a98d3 | 39 | cpu_suspend(0, calxeda_idle_finish); |
34a5eeb2 RH |
40 | cpu_pm_exit(); |
41 | ||
be6a98d3 RH |
42 | return index; |
43 | } | |
44 | ||
be6a98d3 RH |
45 | static struct cpuidle_driver calxeda_idle_driver = { |
46 | .name = "calxeda_idle", | |
be6a98d3 RH |
47 | .states = { |
48 | ARM_CPUIDLE_WFI_STATE, | |
49 | { | |
50 | .name = "PG", | |
51 | .desc = "Power Gate", | |
be6a98d3 RH |
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 | ||
5781532e | 61 | static int calxeda_cpuidle_probe(struct platform_device *pdev) |
be6a98d3 | 62 | { |
0b210d96 | 63 | return cpuidle_register(&calxeda_idle_driver, NULL); |
be6a98d3 | 64 | } |
60a66e37 DL |
65 | |
66 | static struct platform_driver calxeda_cpuidle_plat_driver = { | |
67 | .driver = { | |
68 | .name = "cpuidle-calxeda", | |
60a66e37 DL |
69 | }, |
70 | .probe = calxeda_cpuidle_probe, | |
71 | }; | |
090d1cf1 | 72 | builtin_platform_driver(calxeda_cpuidle_plat_driver); |