projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 71c5dd50 KH |
2 | /* |
| 3 | * UniPhier eFuse driver | |
| 4 | * | |
| 5 | * Copyright (C) 2017 Socionext Inc. | |
| 71c5dd50 KH |
6 | */ |
| 7 | ||
| 8 | #include <linux/device.h> | |
| 9 | #include <linux/io.h> | |
| 10 | #include <linux/module.h> | |
| ac316725 | 11 | #include <linux/mod_devicetable.h> |
| 71c5dd50 KH |
12 | #include <linux/nvmem-provider.h> |
| 13 | #include <linux/platform_device.h> | |
| 14 | ||
| 15 | struct uniphier_efuse_priv { | |
| 16 | void __iomem *base; | |
| 17 | }; | |
| 18 | ||
| 19 | static int uniphier_reg_read(void *context, | |
| 20 | unsigned int reg, void *_val, size_t bytes) | |
| 21 | { | |
| 22 | struct uniphier_efuse_priv *priv = context; | |
| 683618b0 | 23 | u8 *val = _val; |
| 71c5dd50 KH |
24 | int offs; |
| 25 | ||
| 683618b0 KH |
26 | for (offs = 0; offs < bytes; offs += sizeof(u8)) |
| 27 | *val++ = readb(priv->base + reg + offs); | |
| 71c5dd50 KH |
28 | |
| 29 | return 0; | |
| 30 | } | |
| 31 | ||
| 32 | static int uniphier_efuse_probe(struct platform_device *pdev) | |
| 33 | { | |
| 34 | struct device *dev = &pdev->dev; | |
| 35 | struct resource *res; | |
| 36 | struct nvmem_device *nvmem; | |
| 37 | struct nvmem_config econfig = {}; | |
| 38 | struct uniphier_efuse_priv *priv; | |
| 39 | ||
| 40 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 41 | if (!priv) | |
| 42 | return -ENOMEM; | |
| 43 | ||
| 6ac41c55 | 44 | priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
| 71c5dd50 KH |
45 | if (IS_ERR(priv->base)) |
| 46 | return PTR_ERR(priv->base); | |
| 47 | ||
| 683618b0 KH |
48 | econfig.stride = 1; |
| 49 | econfig.word_size = 1; | |
| 71c5dd50 KH |
50 | econfig.read_only = true; |
| 51 | econfig.reg_read = uniphier_reg_read; | |
| 52 | econfig.size = resource_size(res); | |
| 53 | econfig.priv = priv; | |
| 54 | econfig.dev = dev; | |
| 45ff8ef7 | 55 | nvmem = devm_nvmem_register(dev, &econfig); |
| 71c5dd50 | 56 | |
| 45ff8ef7 | 57 | return PTR_ERR_OR_ZERO(nvmem); |
| 71c5dd50 KH |
58 | } |
| 59 | ||
| 60 | static const struct of_device_id uniphier_efuse_of_match[] = { | |
| 61 | { .compatible = "socionext,uniphier-efuse",}, | |
| 62 | {/* sentinel */}, | |
| 63 | }; | |
| 64 | MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match); | |
| 65 | ||
| 66 | static struct platform_driver uniphier_efuse_driver = { | |
| 67 | .probe = uniphier_efuse_probe, | |
| 71c5dd50 KH |
68 | .driver = { |
| 69 | .name = "uniphier-efuse", | |
| 70 | .of_match_table = uniphier_efuse_of_match, | |
| 71 | }, | |
| 72 | }; | |
| 73 | module_platform_driver(uniphier_efuse_driver); | |
| 74 | ||
| 75 | MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); | |
| 76 | MODULE_DESCRIPTION("UniPhier eFuse driver"); | |
| 77 | MODULE_LICENSE("GPL v2"); |