projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ff591a91 AB |
1 | /* |
| 2 | * Copyright (C) 2015 Alban Bedel <albeu@free.fr> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License as published by | |
| 6 | * the Free Software Foundation; either version 2 of the License, or | |
| 7 | * (at your option) any later version. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/platform_device.h> | |
| 17 | #include <linux/reset-controller.h> | |
| 18 | ||
| 19 | struct ath79_reset { | |
| 20 | struct reset_controller_dev rcdev; | |
| 21 | void __iomem *base; | |
| 22 | spinlock_t lock; | |
| 23 | }; | |
| 24 | ||
| 25 | static int ath79_reset_update(struct reset_controller_dev *rcdev, | |
| 26 | unsigned long id, bool assert) | |
| 27 | { | |
| 28 | struct ath79_reset *ath79_reset = | |
| 29 | container_of(rcdev, struct ath79_reset, rcdev); | |
| 30 | unsigned long flags; | |
| 31 | u32 val; | |
| 32 | ||
| 33 | spin_lock_irqsave(&ath79_reset->lock, flags); | |
| 34 | val = readl(ath79_reset->base); | |
| 35 | if (assert) | |
| 36 | val |= BIT(id); | |
| 37 | else | |
| 38 | val &= ~BIT(id); | |
| 39 | writel(val, ath79_reset->base); | |
| 40 | spin_unlock_irqrestore(&ath79_reset->lock, flags); | |
| 41 | ||
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 45 | static int ath79_reset_assert(struct reset_controller_dev *rcdev, | |
| 46 | unsigned long id) | |
| 47 | { | |
| 48 | return ath79_reset_update(rcdev, id, true); | |
| 49 | } | |
| 50 | ||
| 51 | static int ath79_reset_deassert(struct reset_controller_dev *rcdev, | |
| 52 | unsigned long id) | |
| 53 | { | |
| 54 | return ath79_reset_update(rcdev, id, false); | |
| 55 | } | |
| 56 | ||
| 57 | static int ath79_reset_status(struct reset_controller_dev *rcdev, | |
| 58 | unsigned long id) | |
| 59 | { | |
| 60 | struct ath79_reset *ath79_reset = | |
| 61 | container_of(rcdev, struct ath79_reset, rcdev); | |
| 62 | u32 val; | |
| 63 | ||
| 64 | val = readl(ath79_reset->base); | |
| 65 | ||
| 66 | return !!(val & BIT(id)); | |
| 67 | } | |
| 68 | ||
| 69 | static struct reset_control_ops ath79_reset_ops = { | |
| 70 | .assert = ath79_reset_assert, | |
| 71 | .deassert = ath79_reset_deassert, | |
| 72 | .status = ath79_reset_status, | |
| 73 | }; | |
| 74 | ||
| 75 | static int ath79_reset_probe(struct platform_device *pdev) | |
| 76 | { | |
| 77 | struct ath79_reset *ath79_reset; | |
| 78 | struct resource *res; | |
| 79 | ||
| 80 | ath79_reset = devm_kzalloc(&pdev->dev, | |
| 81 | sizeof(*ath79_reset), GFP_KERNEL); | |
| 82 | if (!ath79_reset) | |
| 83 | return -ENOMEM; | |
| 84 | ||
| 85 | platform_set_drvdata(pdev, ath79_reset); | |
| 86 | ||
| 87 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 88 | ath79_reset->base = devm_ioremap_resource(&pdev->dev, res); | |
| 89 | if (IS_ERR(ath79_reset->base)) | |
| 90 | return PTR_ERR(ath79_reset->base); | |
| 91 | ||
| f319cb84 | 92 | spin_lock_init(&ath79_reset->lock); |
| ff591a91 AB |
93 | ath79_reset->rcdev.ops = &ath79_reset_ops; |
| 94 | ath79_reset->rcdev.owner = THIS_MODULE; | |
| 95 | ath79_reset->rcdev.of_node = pdev->dev.of_node; | |
| 96 | ath79_reset->rcdev.of_reset_n_cells = 1; | |
| 97 | ath79_reset->rcdev.nr_resets = 32; | |
| 98 | ||
| 99 | return reset_controller_register(&ath79_reset->rcdev); | |
| 100 | } | |
| 101 | ||
| 102 | static int ath79_reset_remove(struct platform_device *pdev) | |
| 103 | { | |
| 104 | struct ath79_reset *ath79_reset = platform_get_drvdata(pdev); | |
| 105 | ||
| 106 | reset_controller_unregister(&ath79_reset->rcdev); | |
| 107 | ||
| 108 | return 0; | |
| 109 | } | |
| 110 | ||
| 111 | static const struct of_device_id ath79_reset_dt_ids[] = { | |
| 112 | { .compatible = "qca,ar7100-reset", }, | |
| 113 | { }, | |
| 114 | }; | |
| 115 | MODULE_DEVICE_TABLE(of, ath79_reset_dt_ids); | |
| 116 | ||
| 117 | static struct platform_driver ath79_reset_driver = { | |
| 118 | .probe = ath79_reset_probe, | |
| 119 | .remove = ath79_reset_remove, | |
| 120 | .driver = { | |
| 121 | .name = "ath79-reset", | |
| 122 | .of_match_table = ath79_reset_dt_ids, | |
| 123 | }, | |
| 124 | }; | |
| 125 | module_platform_driver(ath79_reset_driver); | |
| 126 | ||
| 127 | MODULE_AUTHOR("Alban Bedel <albeu@free.fr>"); | |
| 128 | MODULE_DESCRIPTION("AR71xx Reset Controller Driver"); | |
| 129 | MODULE_LICENSE("GPL"); |