[linux.git] / drivers / nvmem / qfprom.c

/*
 * Copyright (C) 2015 Srinivas Kandagatla <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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>

static int qfprom_reg_read(void *context,
			unsigned int reg, void *_val, size_t bytes)
{
	void __iomem *base = context;
	u32 *val = _val;
	int i = 0, words = bytes / 4;

	while (words--)
		*val++ = readl(base + reg + (i++ * 4));

	return 0;
}

static int qfprom_reg_write(void *context,
			 unsigned int reg, void *_val, size_t bytes)
{
	void __iomem *base = context;
	u32 *val = _val;
	int i = 0, words = bytes / 4;

	while (words--)
		writel(*val++, base + reg + (i++ * 4));

	return 0;
}

static int qfprom_remove(struct platform_device *pdev)
{
	struct nvmem_device *nvmem = platform_get_drvdata(pdev);

	return nvmem_unregister(nvmem);
}

static struct nvmem_config econfig = {
	.name = "qfprom",
	.owner = THIS_MODULE,
	.stride = 4,
	.word_size = 1,
	.reg_read = qfprom_reg_read,
	.reg_write = qfprom_reg_write,
};

static int qfprom_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct nvmem_device *nvmem;
	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.size = resource_size(res);
	econfig.dev = dev;
	econfig.priv = base;

	nvmem = nvmem_register(&econfig);
	if (IS_ERR(nvmem))
		return PTR_ERR(nvmem);

	platform_set_drvdata(pdev, nvmem);

	return 0;
}

static const struct of_device_id qfprom_of_match[] = {
	{ .compatible = "qcom,qfprom",},
	{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, qfprom_of_match);

static struct platform_driver qfprom_driver = {
	.probe = qfprom_probe,
	.remove = qfprom_remove,
	.driver = {
		.name = "qcom,qfprom",
		.of_match_table = qfprom_of_match,
	},
};
module_platform_driver(qfprom_driver);
MODULE_AUTHOR("Srinivas Kandagatla <[email protected]>");
MODULE_DESCRIPTION("Qualcomm QFPROM driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4ab11996 SK	1	/*
	2	* Copyright (C) 2015 Srinivas Kandagatla <[email protected]>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 and
	6	* only version 2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/device.h>
	15	#include <linux/module.h>
382c62f7	16	#include <linux/io.h>
4ab11996 SK	17	#include <linux/nvmem-provider.h>
4ab11996 SK	18	#include <linux/platform_device.h>
4ab11996	19
382c62f7 SK	20	static int qfprom_reg_read(void *context,
	21	unsigned int reg, void *_val, size_t bytes)
	22	{
	23	void __iomem *base = context;
	24	u32 *val = _val;
	25	int i = 0, words = bytes / 4;
4ab11996	26
382c62f7 SK	27	while (words--)
	28	val++ = readl(base + reg + (i++ 4));
	29
	30	return 0;
	31	}
	32
	33	static int qfprom_reg_write(void *context,
	34	unsigned int reg, void *_val, size_t bytes)
	35	{
	36	void __iomem *base = context;
	37	u32 *val = _val;
	38	int i = 0, words = bytes / 4;
	39
	40	while (words--)
	41	writel(val++, base + reg + (i++ 4));
	42
	43	return 0;
	44	}
4ab11996 SK	45
	46	static int qfprom_remove(struct platform_device *pdev)
	47	{
	48	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
	49
	50	return nvmem_unregister(nvmem);
	51	}
	52
382c62f7 SK	53	static struct nvmem_config econfig = {
	54	.name = "qfprom",
	55	.owner = THIS_MODULE,
	56	.stride = 4,
	57	.word_size = 1,
	58	.reg_read = qfprom_reg_read,
	59	.reg_write = qfprom_reg_write,
	60	};
	61
4ab11996 SK	62	static int qfprom_probe(struct platform_device *pdev)
	63	{
	64	struct device *dev = &pdev->dev;
	65	struct resource *res;
	66	struct nvmem_device *nvmem;
4ab11996 SK	67	void __iomem *base;
	68
	69	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	70	base = devm_ioremap_resource(dev, res);
	71	if (IS_ERR(base))
	72	return PTR_ERR(base);
	73
382c62f7	74	econfig.size = resource_size(res);
4ab11996	75	econfig.dev = dev;
382c62f7 SK	76	econfig.priv = base;
382c62f7 SK	77
4ab11996 SK	78	nvmem = nvmem_register(&econfig);
	79	if (IS_ERR(nvmem))
	80	return PTR_ERR(nvmem);
	81
	82	platform_set_drvdata(pdev, nvmem);
	83
	84	return 0;
	85	}
	86
	87	static const struct of_device_id qfprom_of_match[] = {
	88	{ .compatible = "qcom,qfprom",},
	89	{/* sentinel */},
	90	};
	91	MODULE_DEVICE_TABLE(of, qfprom_of_match);
	92
	93	static struct platform_driver qfprom_driver = {
	94	.probe = qfprom_probe,
	95	.remove = qfprom_remove,
	96	.driver = {
	97	.name = "qcom,qfprom",
	98	.of_match_table = qfprom_of_match,
	99	},
	100	};
	101	module_platform_driver(qfprom_driver);
	102	MODULE_AUTHOR("Srinivas Kandagatla <[email protected]>");
	103	MODULE_DESCRIPTION("Qualcomm QFPROM driver");
	104	MODULE_LICENSE("GPL v2");