nvmem: mediatek: Add Mediatek EFUSE driver

Add Mediatek EFUSE driver to access hardware data like
thermal sensor calibration or HDMI impedance.

Signed-off-by: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 102 insertions, 0 deletions

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 6ff1b5051ae1..5bd18cc1a69c 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -45,6 +45,17 @@ config NVMEM_MXS_OCOTP
           This driver can also be built as a module. If so, the module
           will be called nvmem-mxs-ocotp.
 
+config MTK_EFUSE
+        tristate "Mediatek SoCs EFUSE support"
+        depends on ARCH_MEDIATEK || COMPILE_TEST
+        select REGMAP_MMIO
+        help
+          This is a driver to access hardware related data like sensor
+          calibration, HDMI impedance etc.
+
+          This driver can also be built as a module. If so, the module
+          will be called efuse-mtk.
+
 config QCOM_QFPROM
         tristate "QCOM QFPROM Support"
         depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index c14a55644c5f..45ab1ae08fa9 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -12,6 +12,8 @@ obj-$(CONFIG_NVMEM_LPC18XX_EEPROM)	+= nvmem_lpc18xx_eeprom.o
 nvmem_lpc18xx_eeprom-y  := lpc18xx_eeprom.o
 obj-$(CONFIG_NVMEM_MXS_OCOTP)   += nvmem-mxs-ocotp.o
 nvmem-mxs-ocotp-y               := mxs-ocotp.o
+obj-$(CONFIG_MTK_EFUSE)         += nvmem_mtk-efuse.o
+nvmem_mtk-efuse-y               := mtk-efuse.o
 obj-$(CONFIG_QCOM_QFPROM)       += nvmem_qfprom.o
 nvmem_qfprom-y                  := qfprom.o
 obj-$(CONFIG_ROCKCHIP_EFUSE)    += nvmem_rockchip_efuse.o
diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
new file mode 100644
index 000000000000..7b35f5b630cd
--- /dev/null
+++ b/drivers/nvmem/mtk-efuse.c
@@ -0,0 +1,89 @@
+/*
+ * 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,
+        },
+};
+module_platform_driver(mtk_efuse_driver);
+MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
+MODULE_DESCRIPTION("Mediatek EFUSE driver");
+MODULE_LICENSE("GPL v2");