[mirror_ubuntu-hirsute-kernel.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/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 = 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");
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>
ba360fd0	17	#include <linux/io.h>
4c7e4fe3 ACC	18	#include <linux/nvmem-provider.h>
4c7e4fe3 ACC	19	#include <linux/platform_device.h>
4c7e4fe3	20
a48f1fff MY	21	struct mtk_efuse_priv {
	22	void __iomem *base;
	23	};
	24
ba360fd0 SK	25	static int mtk_reg_read(void *context,
	26	unsigned int reg, void *_val, size_t bytes)
	27	{
a48f1fff	28	struct mtk_efuse_priv *priv = context;
ba360fd0 SK	29	u32 *val = _val;
	30	int i = 0, words = bytes / 4;
	31
	32	while (words--)
a48f1fff	33	val++ = readl(priv->base + reg + (i++ 4));
ba360fd0 SK	34
	35	return 0;
	36	}
	37
	38	static int mtk_reg_write(void *context,
	39	unsigned int reg, void *_val, size_t bytes)
	40	{
a48f1fff	41	struct mtk_efuse_priv *priv = context;
ba360fd0 SK	42	u32 *val = _val;
	43	int i = 0, words = bytes / 4;
	44
	45	while (words--)
a48f1fff	46	writel(val++, priv->base + reg + (i++ 4));
ba360fd0 SK	47
	48	return 0;
	49	}
4c7e4fe3 ACC	50
	51	static int mtk_efuse_probe(struct platform_device *pdev)
	52	{
	53	struct device *dev = &pdev->dev;
	54	struct resource *res;
	55	struct nvmem_device *nvmem;
4dd5f60e	56	struct nvmem_config econfig = {};
a48f1fff MY	57	struct mtk_efuse_priv *priv;
	58
	59	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	60	if (!priv)
	61	return -ENOMEM;
4c7e4fe3 ACC	62
4c7e4fe3 ACC	63	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a48f1fff MY	64	priv->base = devm_ioremap_resource(dev, res);
	65	if (IS_ERR(priv->base))
	66	return PTR_ERR(priv->base);
4c7e4fe3	67
4dd5f60e MY	68	econfig.stride = 4;
	69	econfig.word_size = 4;
	70	econfig.reg_read = mtk_reg_read;
	71	econfig.reg_write = mtk_reg_write;
	72	econfig.size = resource_size(res);
a48f1fff	73	econfig.priv = priv;
4dd5f60e	74	econfig.dev = dev;
4dd5f60e	75	nvmem = nvmem_register(&econfig);
4c7e4fe3 ACC	76	if (IS_ERR(nvmem))
	77	return PTR_ERR(nvmem);
	78
	79	platform_set_drvdata(pdev, nvmem);
	80
	81	return 0;
	82	}
	83
	84	static int mtk_efuse_remove(struct platform_device *pdev)
	85	{
	86	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
	87
	88	return nvmem_unregister(nvmem);
	89	}
	90
	91	static const struct of_device_id mtk_efuse_of_match[] = {
	92	{ .compatible = "mediatek,mt8173-efuse",},
	93	{ .compatible = "mediatek,efuse",},
	94	{/* sentinel */},
	95	};
	96	MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
	97
	98	static struct platform_driver mtk_efuse_driver = {
	99	.probe = mtk_efuse_probe,
	100	.remove = mtk_efuse_remove,
	101	.driver = {
	102	.name = "mediatek,efuse",
	103	.of_match_table = mtk_efuse_of_match,
	104	},
	105	};
564e7f87 ACC	106
	107	static int __init mtk_efuse_init(void)
	108	{
	109	int ret;
	110
	111	ret = platform_driver_register(&mtk_efuse_driver);
	112	if (ret) {
	113	pr_err("Failed to register efuse driver\n");
	114	return ret;
	115	}
	116
	117	return 0;
	118	}
	119
	120	static void __exit mtk_efuse_exit(void)
	121	{
	122	return platform_driver_unregister(&mtk_efuse_driver);
	123	}
	124
	125	subsys_initcall(mtk_efuse_init);
	126	module_exit(mtk_efuse_exit);
	127
4c7e4fe3 ACC	128	MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
	129	MODULE_DESCRIPTION("Mediatek EFUSE driver");
	130	MODULE_LICENSE("GPL v2");