| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (c) 2019 MediaTek Inc. |
| 4 | */ |
| 5 | |
| 6 | |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/of.h> |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/cpuidle.h> |
| 12 | #include <linux/soc/mediatek/mtk-lpm.h> |
| 13 | |
| 14 | #define MTK_PWR_CONSERVATION_PREPARE (0) |
| 15 | #define MTK_PWR_CONSERVATION_RESUME (1) |
| 16 | |
| 17 | |
| 18 | typedef int (*mtk_pwr_conservation_fn)(int type, |
| 19 | struct cpuidle_driver *drv, |
| 20 | int index); |
| 21 | |
| 22 | static struct mtk_cpuidle_op *mtk_lpm_ops __read_mostly; |
| 23 | |
| 24 | int mtk_lpm_drv_cpuidle_ops_set(struct mtk_cpuidle_op *op) |
| 25 | { |
| 26 | int ret = 0; |
| 27 | |
| 28 | cpuidle_pause_and_lock(); |
| 29 | |
| 30 | if ((!op && mtk_lpm_ops) || (op && !mtk_lpm_ops)) |
| 31 | rcu_assign_pointer(mtk_lpm_ops, (typeof(mtk_lpm_ops))(op)); |
| 32 | else |
| 33 | ret = -EACCES; |
| 34 | |
| 35 | cpuidle_resume_and_unlock(); |
| 36 | |
| 37 | return ret; |
| 38 | } |
| 39 | EXPORT_SYMBOL(mtk_lpm_drv_cpuidle_ops_set); |
| 40 | |
| 41 | int mtk_lpm_pwr_conservation(int type, |
| 42 | struct cpuidle_driver *drv, |
| 43 | int index) |
| 44 | { |
| 45 | int ret = -EBADR; |
| 46 | |
| 47 | if (!mtk_lpm_ops) |
| 48 | return ret; |
| 49 | |
| 50 | switch (type) { |
| 51 | case MTK_PWR_CONSERVATION_PREPARE: |
| 52 | if (mtk_lpm_ops->cpuidle_prepare) |
| 53 | ret = mtk_lpm_ops->cpuidle_prepare(drv, index); |
| 54 | break; |
| 55 | case MTK_PWR_CONSERVATION_RESUME: |
| 56 | if (mtk_lpm_ops->cpuidle_resume) |
| 57 | mtk_lpm_ops->cpuidle_resume(drv, index); |
| 58 | ret = 0; |
| 59 | break; |
| 60 | default: |
| 61 | break; |
| 62 | } |
| 63 | |
| 64 | return ret; |
| 65 | } |
| 66 | |
| 67 | static int mtk_lp_pm_driver_probe(struct platform_device *pdev) |
| 68 | { |
| 69 | struct platform_device *mtk_cpuidle_pm_dev; |
| 70 | int ret = -ENOMEM; |
| 71 | mtk_pwr_conservation_fn mtk_lpm_pwr = mtk_lpm_pwr_conservation; |
| 72 | |
| 73 | mtk_cpuidle_pm_dev = |
| 74 | platform_device_alloc(MTK_CPUIDLE_PM_NAME, -1); |
| 75 | |
| 76 | if (!mtk_cpuidle_pm_dev) |
| 77 | goto out_probe_alloc_fail; |
| 78 | |
| 79 | mtk_cpuidle_pm_dev->dev.parent = &pdev->dev; |
| 80 | ret = platform_device_add(mtk_cpuidle_pm_dev); |
| 81 | |
| 82 | if (ret) |
| 83 | goto put_device; |
| 84 | |
| 85 | platform_device_add_data(mtk_cpuidle_pm_dev, |
| 86 | &mtk_lpm_pwr, |
| 87 | sizeof(mtk_lpm_pwr)); |
| 88 | |
| 89 | device_init_wakeup(&mtk_cpuidle_pm_dev->dev, true); |
| 90 | |
| 91 | return 0; |
| 92 | |
| 93 | put_device: |
| 94 | platform_device_put(mtk_cpuidle_pm_dev); |
| 95 | out_probe_alloc_fail: |
| 96 | |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | static const struct of_device_id of_mtk_lp_pm_match[] = { |
| 101 | { .compatible = "mediatek,mtk-lpm" }, |
| 102 | {} |
| 103 | }; |
| 104 | |
| 105 | static struct platform_driver mtk_lp_pm_driver = { |
| 106 | .probe = mtk_lp_pm_driver_probe, |
| 107 | .driver = { |
| 108 | .name = "mtk_lpm_driver", |
| 109 | .owner = THIS_MODULE, |
| 110 | .of_match_table = of_match_ptr(of_mtk_lp_pm_match), |
| 111 | }, |
| 112 | }; |
| 113 | builtin_platform_driver(mtk_lp_pm_driver); |