1 /* 2 * Copyright (c) 2015 MediaTek Inc. 3 * Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 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/device.h> 16 #include <linux/module.h> 17 #include <linux/nvmem-provider.h> 18 #include <linux/platform_device.h> 19 #include <linux/regmap.h> 20 21 static struct regmap_config mtk_regmap_config = { 22 .reg_bits = 32, 23 .val_bits = 32, 24 .reg_stride = 4, 25 }; 26 27 static int mtk_efuse_probe(struct platform_device *pdev) 28 { 29 struct device *dev = &pdev->dev; 30 struct resource *res; 31 struct nvmem_device *nvmem; 32 struct nvmem_config *econfig; 33 struct regmap *regmap; 34 void __iomem *base; 35 36 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 37 base = devm_ioremap_resource(dev, res); 38 if (IS_ERR(base)) 39 return PTR_ERR(base); 40 41 econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL); 42 if (!econfig) 43 return -ENOMEM; 44 45 mtk_regmap_config.max_register = resource_size(res) - 1; 46 47 regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config); 48 if (IS_ERR(regmap)) { 49 dev_err(dev, "regmap init failed\n"); 50 return PTR_ERR(regmap); 51 } 52 53 econfig->dev = dev; 54 econfig->owner = THIS_MODULE; 55 nvmem = nvmem_register(econfig); 56 if (IS_ERR(nvmem)) 57 return PTR_ERR(nvmem); 58 59 platform_set_drvdata(pdev, nvmem); 60 61 return 0; 62 } 63 64 static int mtk_efuse_remove(struct platform_device *pdev) 65 { 66 struct nvmem_device *nvmem = platform_get_drvdata(pdev); 67 68 return nvmem_unregister(nvmem); 69 } 70 71 static const struct of_device_id mtk_efuse_of_match[] = { 72 { .compatible = "mediatek,mt8173-efuse",}, 73 { .compatible = "mediatek,efuse",}, 74 {/* sentinel */}, 75 }; 76 MODULE_DEVICE_TABLE(of, mtk_efuse_of_match); 77 78 static struct platform_driver mtk_efuse_driver = { 79 .probe = mtk_efuse_probe, 80 .remove = mtk_efuse_remove, 81 .driver = { 82 .name = "mediatek,efuse", 83 .of_match_table = mtk_efuse_of_match, 84 }, 85 }; 86 87 static int __init mtk_efuse_init(void) 88 { 89 int ret; 90 91 ret = platform_driver_register(&mtk_efuse_driver); 92 if (ret) { 93 pr_err("Failed to register efuse driver\n"); 94 return ret; 95 } 96 97 return 0; 98 } 99 100 static void __exit mtk_efuse_exit(void) 101 { 102 return platform_driver_unregister(&mtk_efuse_driver); 103 } 104 105 subsys_initcall(mtk_efuse_init); 106 module_exit(mtk_efuse_exit); 107 108 MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>"); 109 MODULE_DESCRIPTION("Mediatek EFUSE driver"); 110 MODULE_LICENSE("GPL v2"); 111