[linux-2.6-block.git] / drivers / nvmem / mtk-efuse.c

/*
 * 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/mod_devicetable.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");
Commit	Line	Data
4c7e4fe3 ACC	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>
ac316725	17	#include <linux/mod_devicetable.h>
ba360fd0	18	#include <linux/io.h>
4c7e4fe3 ACC	19	#include <linux/nvmem-provider.h>
4c7e4fe3 ACC	20	#include <linux/platform_device.h>
4c7e4fe3	21
a48f1fff MY	22	struct mtk_efuse_priv {
	23	void __iomem *base;
	24	};
	25
ba360fd0 SK	26	static int mtk_reg_read(void *context,
	27	unsigned int reg, void *_val, size_t bytes)
	28	{
a48f1fff	29	struct mtk_efuse_priv *priv = context;
ba360fd0 SK	30	u32 *val = _val;
	31	int i = 0, words = bytes / 4;
	32
	33	while (words--)
a48f1fff	34	val++ = readl(priv->base + reg + (i++ 4));
ba360fd0 SK	35
	36	return 0;
	37	}
	38
	39	static int mtk_reg_write(void *context,
	40	unsigned int reg, void *_val, size_t bytes)
	41	{
a48f1fff	42	struct mtk_efuse_priv *priv = context;
ba360fd0 SK	43	u32 *val = _val;
	44	int i = 0, words = bytes / 4;
	45
	46	while (words--)
a48f1fff	47	writel(val++, priv->base + reg + (i++ 4));
ba360fd0 SK	48
	49	return 0;
	50	}
4c7e4fe3 ACC	51
	52	static int mtk_efuse_probe(struct platform_device *pdev)
	53	{
	54	struct device *dev = &pdev->dev;
	55	struct resource *res;
	56	struct nvmem_device *nvmem;
4dd5f60e	57	struct nvmem_config econfig = {};
a48f1fff MY	58	struct mtk_efuse_priv *priv;
	59
	60	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	61	if (!priv)
	62	return -ENOMEM;
4c7e4fe3 ACC	63
4c7e4fe3 ACC	64	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a48f1fff MY	65	priv->base = devm_ioremap_resource(dev, res);
	66	if (IS_ERR(priv->base))
	67	return PTR_ERR(priv->base);
4c7e4fe3	68
4dd5f60e MY	69	econfig.stride = 4;
	70	econfig.word_size = 4;
	71	econfig.reg_read = mtk_reg_read;
	72	econfig.reg_write = mtk_reg_write;
	73	econfig.size = resource_size(res);
a48f1fff	74	econfig.priv = priv;
4dd5f60e	75	econfig.dev = dev;
7e68a645	76	nvmem = devm_nvmem_register(dev, &econfig);
4c7e4fe3	77
7e68a645	78	return PTR_ERR_OR_ZERO(nvmem);
4c7e4fe3 ACC	79	}
	80
	81	static const struct of_device_id mtk_efuse_of_match[] = {
	82	{ .compatible = "mediatek,mt8173-efuse",},
	83	{ .compatible = "mediatek,efuse",},
	84	{/* sentinel */},
	85	};
	86	MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
	87
	88	static struct platform_driver mtk_efuse_driver = {
	89	.probe = mtk_efuse_probe,
4c7e4fe3 ACC	90	.driver = {
	91	.name = "mediatek,efuse",
	92	.of_match_table = mtk_efuse_of_match,
	93	},
	94	};
564e7f87 ACC	95
	96	static int __init mtk_efuse_init(void)
	97	{
	98	int ret;
	99
	100	ret = platform_driver_register(&mtk_efuse_driver);
	101	if (ret) {
	102	pr_err("Failed to register efuse driver\n");
	103	return ret;
	104	}
	105
	106	return 0;
	107	}
	108
	109	static void __exit mtk_efuse_exit(void)
	110	{
	111	return platform_driver_unregister(&mtk_efuse_driver);
	112	}
	113
	114	subsys_initcall(mtk_efuse_init);
	115	module_exit(mtk_efuse_exit);
	116
4c7e4fe3 ACC	117	MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
	118	MODULE_DESCRIPTION("Mediatek EFUSE driver");
	119	MODULE_LICENSE("GPL v2");