projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 71c5dd50 KH |
1 | /* |
| 2 | * UniPhier eFuse driver | |
| 3 | * | |
| 4 | * Copyright (C) 2017 Socionext Inc. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/device.h> | |
| 17 | #include <linux/io.h> | |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/nvmem-provider.h> | |
| 20 | #include <linux/platform_device.h> | |
| 21 | ||
| 22 | struct uniphier_efuse_priv { | |
| 23 | void __iomem *base; | |
| 24 | }; | |
| 25 | ||
| 26 | static int uniphier_reg_read(void *context, | |
| 27 | unsigned int reg, void *_val, size_t bytes) | |
| 28 | { | |
| 29 | struct uniphier_efuse_priv *priv = context; | |
| 30 | u32 *val = _val; | |
| 31 | int offs; | |
| 32 | ||
| 33 | for (offs = 0; offs < bytes; offs += sizeof(u32)) | |
| 34 | *val++ = readl(priv->base + reg + offs); | |
| 35 | ||
| 36 | return 0; | |
| 37 | } | |
| 38 | ||
| 39 | static int uniphier_efuse_probe(struct platform_device *pdev) | |
| 40 | { | |
| 41 | struct device *dev = &pdev->dev; | |
| 42 | struct resource *res; | |
| 43 | struct nvmem_device *nvmem; | |
| 44 | struct nvmem_config econfig = {}; | |
| 45 | struct uniphier_efuse_priv *priv; | |
| 46 | ||
| 47 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 48 | if (!priv) | |
| 49 | return -ENOMEM; | |
| 50 | ||
| 51 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 52 | priv->base = devm_ioremap_resource(dev, res); | |
| 53 | if (IS_ERR(priv->base)) | |
| 54 | return PTR_ERR(priv->base); | |
| 55 | ||
| 56 | econfig.stride = 4; | |
| 57 | econfig.word_size = 4; | |
| 58 | econfig.read_only = true; | |
| 59 | econfig.reg_read = uniphier_reg_read; | |
| 60 | econfig.size = resource_size(res); | |
| 61 | econfig.priv = priv; | |
| 62 | econfig.dev = dev; | |
| 63 | nvmem = nvmem_register(&econfig); | |
| 64 | if (IS_ERR(nvmem)) | |
| 65 | return PTR_ERR(nvmem); | |
| 66 | ||
| 67 | platform_set_drvdata(pdev, nvmem); | |
| 68 | ||
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | static int uniphier_efuse_remove(struct platform_device *pdev) | |
| 73 | { | |
| 74 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
| 75 | ||
| 76 | return nvmem_unregister(nvmem); | |
| 77 | } | |
| 78 | ||
| 79 | static const struct of_device_id uniphier_efuse_of_match[] = { | |
| 80 | { .compatible = "socionext,uniphier-efuse",}, | |
| 81 | {/* sentinel */}, | |
| 82 | }; | |
| 83 | MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match); | |
| 84 | ||
| 85 | static struct platform_driver uniphier_efuse_driver = { | |
| 86 | .probe = uniphier_efuse_probe, | |
| 87 | .remove = uniphier_efuse_remove, | |
| 88 | .driver = { | |
| 89 | .name = "uniphier-efuse", | |
| 90 | .of_match_table = uniphier_efuse_of_match, | |
| 91 | }, | |
| 92 | }; | |
| 93 | module_platform_driver(uniphier_efuse_driver); | |
| 94 | ||
| 95 | MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); | |
| 96 | MODULE_DESCRIPTION("UniPhier eFuse driver"); | |
| 97 | MODULE_LICENSE("GPL v2"); |