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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * UniPhier eFuse driver
 *
 * Copyright (C) 2017 Socionext Inc.
 */

#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.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
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
71c5dd50 KH	2	/*
	3	* UniPhier eFuse driver
	4	*
	5	* Copyright (C) 2017 Socionext Inc.
71c5dd50 KH	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/io.h>
	10	#include <linux/module.h>
ac316725	11	#include <linux/mod_devicetable.h>
71c5dd50 KH	12	#include <linux/nvmem-provider.h>
	13	#include <linux/platform_device.h>
	14
	15	struct uniphier_efuse_priv {
	16	void __iomem *base;
	17	};
	18
	19	static int uniphier_reg_read(void *context,
	20	unsigned int reg, void *_val, size_t bytes)
	21	{
	22	struct uniphier_efuse_priv *priv = context;
683618b0	23	u8 *val = _val;
71c5dd50 KH	24	int offs;
71c5dd50 KH	25
683618b0 KH	26	for (offs = 0; offs < bytes; offs += sizeof(u8))
683618b0 KH	27	*val++ = readb(priv->base + reg + offs);
71c5dd50 KH	28
	29	return 0;
	30	}
	31
	32	static int uniphier_efuse_probe(struct platform_device *pdev)
	33	{
	34	struct device *dev = &pdev->dev;
	35	struct resource *res;
	36	struct nvmem_device *nvmem;
	37	struct nvmem_config econfig = {};
	38	struct uniphier_efuse_priv *priv;
	39
	40	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	41	if (!priv)
	42	return -ENOMEM;
	43
	44	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	45	priv->base = devm_ioremap_resource(dev, res);
	46	if (IS_ERR(priv->base))
	47	return PTR_ERR(priv->base);
	48
683618b0 KH	49	econfig.stride = 1;
683618b0 KH	50	econfig.word_size = 1;
71c5dd50 KH	51	econfig.read_only = true;
	52	econfig.reg_read = uniphier_reg_read;
	53	econfig.size = resource_size(res);
	54	econfig.priv = priv;
	55	econfig.dev = dev;
45ff8ef7	56	nvmem = devm_nvmem_register(dev, &econfig);
71c5dd50	57
45ff8ef7	58	return PTR_ERR_OR_ZERO(nvmem);
71c5dd50 KH	59	}
	60
	61	static const struct of_device_id uniphier_efuse_of_match[] = {
	62	{ .compatible = "socionext,uniphier-efuse",},
	63	{/* sentinel */},
	64	};
	65	MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
	66
	67	static struct platform_driver uniphier_efuse_driver = {
	68	.probe = uniphier_efuse_probe,
71c5dd50 KH	69	.driver = {
	70	.name = "uniphier-efuse",
	71	.of_match_table = uniphier_efuse_of_match,
	72	},
	73	};
	74	module_platform_driver(uniphier_efuse_driver);
	75
	76	MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
	77	MODULE_DESCRIPTION("UniPhier eFuse driver");
	78	MODULE_LICENSE("GPL v2");