1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * UniPhier eFuse driver 4 * 5 * Copyright (C) 2017 Socionext Inc. 6 */ 7 8 #include <linux/device.h> 9 #include <linux/io.h> 10 #include <linux/module.h> 11 #include <linux/nvmem-provider.h> 12 #include <linux/platform_device.h> 13 14 struct uniphier_efuse_priv { 15 void __iomem *base; 16 }; 17 18 static int uniphier_reg_read(void *context, 19 unsigned int reg, void *_val, size_t bytes) 20 { 21 struct uniphier_efuse_priv *priv = context; 22 u8 *val = _val; 23 int offs; 24 25 for (offs = 0; offs < bytes; offs += sizeof(u8)) 26 *val++ = readb(priv->base + reg + offs); 27 28 return 0; 29 } 30 31 static int uniphier_efuse_probe(struct platform_device *pdev) 32 { 33 struct device *dev = &pdev->dev; 34 struct resource *res; 35 struct nvmem_device *nvmem; 36 struct nvmem_config econfig = {}; 37 struct uniphier_efuse_priv *priv; 38 39 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 40 if (!priv) 41 return -ENOMEM; 42 43 priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 44 if (IS_ERR(priv->base)) 45 return PTR_ERR(priv->base); 46 47 econfig.stride = 1; 48 econfig.word_size = 1; 49 econfig.read_only = true; 50 econfig.reg_read = uniphier_reg_read; 51 econfig.size = resource_size(res); 52 econfig.priv = priv; 53 econfig.dev = dev; 54 econfig.add_legacy_fixed_of_cells = true; 55 nvmem = devm_nvmem_register(dev, &econfig); 56 57 return PTR_ERR_OR_ZERO(nvmem); 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, 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"); 78