1 files changed, 110 insertions, 0 deletions

diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
new file mode 100644
index 000000000000..9c49369beea5
--- /dev/null
+++ b/drivers/nvmem/mtk-efuse.c
@@ -0,0 +1,110 @@
+/*
+ * 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/nvmem-provider.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static struct regmap_config mtk_regmap_config = {
+        .reg_bits = 32,
+        .val_bits = 32,
+        .reg_stride = 4,
+};
+
+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 regmap *regmap;
+        void __iomem *base;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        base = devm_ioremap_resource(dev, res);
+        if (IS_ERR(base))
+                return PTR_ERR(base);
+
+        econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
+        if (!econfig)
+                return -ENOMEM;
+
+        mtk_regmap_config.max_register = resource_size(res) - 1;
+
+        regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
+        if (IS_ERR(regmap)) {
+                dev_err(dev, "regmap init failed\n");
+                return PTR_ERR(regmap);
+        }
+
+        econfig->dev = dev;
+        econfig->owner = THIS_MODULE;
+        nvmem = nvmem_register(econfig);
+        if (IS_ERR(nvmem))
+                return PTR_ERR(nvmem);
+
+        platform_set_drvdata(pdev, nvmem);
+
+        return 0;
+}
+
+static int mtk_efuse_remove(struct platform_device *pdev)
+{
+        struct nvmem_device *nvmem = platform_get_drvdata(pdev);
+
+        return nvmem_unregister(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,
+        .remove = mtk_efuse_remove,
+        .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");