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

/*
 * UniPhier eFuse driver
 *
 * Copyright (C) 2017 Socionext Inc.
 *
 * 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/io.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>

struct uniphier_efuse_priv {
	void __iomem *base;
};

static int uniphier_reg_read(void *context,
			     unsigned int reg, void *_val, size_t bytes)
{
	struct uniphier_efuse_priv *priv = context;
	u8 *val = _val;
	int offs;

	for (offs = 0; offs < bytes; offs += sizeof(u8))
		*val++ = readb(priv->base + reg + offs);

	return 0;
}

static int uniphier_efuse_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct nvmem_device *nvmem;
	struct nvmem_config econfig = {};
	struct uniphier_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 = 1;
	econfig.word_size = 1;
	econfig.read_only = true;
	econfig.reg_read = uniphier_reg_read;
	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 uniphier_efuse_of_match[] = {
	{ .compatible = "socionext,uniphier-efuse",},
	{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);

static struct platform_driver uniphier_efuse_driver = {
	.probe = uniphier_efuse_probe,
	.driver = {
		.name = "uniphier-efuse",
		.of_match_table = uniphier_efuse_of_match,
	},
};
module_platform_driver(uniphier_efuse_driver);

MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
MODULE_DESCRIPTION("UniPhier eFuse driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
71c5dd50 KH	1	/*
	2	* UniPhier eFuse driver
	3	*
	4	* Copyright (C) 2017 Socionext Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	#include <linux/device.h>
	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/nvmem-provider.h>
	20	#include <linux/platform_device.h>
	21
	22	struct uniphier_efuse_priv {
	23	void __iomem *base;
	24	};
	25
	26	static int uniphier_reg_read(void *context,
	27	unsigned int reg, void *_val, size_t bytes)
	28	{
	29	struct uniphier_efuse_priv *priv = context;
683618b0	30	u8 *val = _val;
71c5dd50 KH	31	int offs;
71c5dd50 KH	32
683618b0 KH	33	for (offs = 0; offs < bytes; offs += sizeof(u8))
683618b0 KH	34	*val++ = readb(priv->base + reg + offs);
71c5dd50 KH	35
	36	return 0;
	37	}
	38
	39	static int uniphier_efuse_probe(struct platform_device *pdev)
	40	{
	41	struct device *dev = &pdev->dev;
	42	struct resource *res;
	43	struct nvmem_device *nvmem;
	44	struct nvmem_config econfig = {};
	45	struct uniphier_efuse_priv *priv;
	46
	47	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	48	if (!priv)
	49	return -ENOMEM;
	50
	51	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	52	priv->base = devm_ioremap_resource(dev, res);
	53	if (IS_ERR(priv->base))
	54	return PTR_ERR(priv->base);
	55
683618b0 KH	56	econfig.stride = 1;
683618b0 KH	57	econfig.word_size = 1;
71c5dd50 KH	58	econfig.read_only = true;
	59	econfig.reg_read = uniphier_reg_read;
	60	econfig.size = resource_size(res);
	61	econfig.priv = priv;
	62	econfig.dev = dev;
45ff8ef7	63	nvmem = devm_nvmem_register(dev, &econfig);
71c5dd50	64
45ff8ef7	65	return PTR_ERR_OR_ZERO(nvmem);
71c5dd50 KH	66	}
	67
	68	static const struct of_device_id uniphier_efuse_of_match[] = {
	69	{ .compatible = "socionext,uniphier-efuse",},
	70	{/* sentinel */},
	71	};
	72	MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
	73
	74	static struct platform_driver uniphier_efuse_driver = {
	75	.probe = uniphier_efuse_probe,
71c5dd50 KH	76	.driver = {
	77	.name = "uniphier-efuse",
	78	.of_match_table = uniphier_efuse_of_match,
	79	},
	80	};
	81	module_platform_driver(uniphier_efuse_driver);
	82
	83	MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
	84	MODULE_DESCRIPTION("UniPhier eFuse driver");
	85	MODULE_LICENSE("GPL v2");