/* * Copyright (c) 2015 MediaTek Inc. * Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/device.h> #include <linux/module.h> #include <linux/io.h> #include <linux/nvmem-provider.h> #include <linux/platform_device.h> struct mtk_efuse_priv { void __iomem *base; }; static int mtk_reg_read(void *context, unsigned int reg, void *_val, size_t bytes) { struct mtk_efuse_priv *priv = context; u32 *val = _val; int i = 0, words = bytes / 4; while (words--) *val++ = readl(priv->base + reg + (i++ * 4)); return 0; } static int mtk_reg_write(void *context, unsigned int reg, void *_val, size_t bytes) { struct mtk_efuse_priv *priv = context; u32 *val = _val; int i = 0, words = bytes / 4; while (words--) writel(*val++, priv->base + reg + (i++ * 4)); return 0; } static int mtk_efuse_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct resource *res; struct nvmem_device *nvmem; struct nvmem_config econfig = {}; struct mtk_efuse_priv *priv; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); priv->base = devm_ioremap_resource(dev, res); if (IS_ERR(priv->base)) return PTR_ERR(priv->base); econfig.stride = 4; econfig.word_size = 4; econfig.reg_read = mtk_reg_read; econfig.reg_write = mtk_reg_write; econfig.size = resource_size(res); econfig.priv = priv; econfig.dev = dev; nvmem = devm_nvmem_register(dev, &econfig); return PTR_ERR_OR_ZERO(nvmem); } static const struct of_device_id mtk_efuse_of_match[] = { { .compatible = "mediatek,mt8173-efuse",}, { .compatible = "mediatek,efuse",}, {/* sentinel */}, }; MODULE_DEVICE_TABLE(of, mtk_efuse_of_match); static struct platform_driver mtk_efuse_driver = { .probe = mtk_efuse_probe, .driver = { .name = "mediatek,efuse", .of_match_table = mtk_efuse_of_match, }, }; static int __init mtk_efuse_init(void) { int ret; ret = platform_driver_register(&mtk_efuse_driver); if (ret) { pr_err("Failed to register efuse driver\n"); return ret; } return 0; } static void __exit mtk_efuse_exit(void) { return platform_driver_unregister(&mtk_efuse_driver); } subsys_initcall(mtk_efuse_init); module_exit(mtk_efuse_exit); MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>"); MODULE_DESCRIPTION("Mediatek EFUSE driver"); MODULE_LICENSE("GPL v2");