[mirror_ubuntu-bionic-kernel.git] / drivers / nvmem / qfprom.c

/*
 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
 *
 * 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>

struct qfprom_priv {
	void __iomem *base;
};

static int qfprom_reg_read(void *context,
			unsigned int reg, void *_val, size_t bytes)
{
	struct qfprom_priv *priv = context;
	u8 *val = _val;
	int i = 0, words = bytes;

	while (words--)
		*val++ = readb(priv->base + reg + i++);

	return 0;
}

static int qfprom_reg_write(void *context,
			 unsigned int reg, void *_val, size_t bytes)
{
	struct qfprom_priv *priv = context;
	u8 *val = _val;
	int i = 0, words = bytes;

	while (words--)
		writeb(*val++, priv->base + reg + i++);

	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",
	.stride = 1,
	.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;
	struct qfprom_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.size = resource_size(res);
	econfig.dev = dev;
	econfig.priv = priv;

	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 <srinivas.kandagatla@linaro.org>");
MODULE_DESCRIPTION("Qualcomm QFPROM driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4ab11996 SK	1	/*
	2	* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
	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
ec3672b8 MY	20	struct qfprom_priv {
	21	void __iomem *base;
	22	};
	23
382c62f7 SK	24	static int qfprom_reg_read(void *context,
	25	unsigned int reg, void *_val, size_t bytes)
	26	{
ec3672b8	27	struct qfprom_priv *priv = context;
01d0d2c4 VG	28	u8 *val = _val;
01d0d2c4 VG	29	int i = 0, words = bytes;
4ab11996	30
382c62f7	31	while (words--)
ec3672b8	32	*val++ = readb(priv->base + reg + i++);
382c62f7 SK	33
	34	return 0;
	35	}
	36
	37	static int qfprom_reg_write(void *context,
	38	unsigned int reg, void *_val, size_t bytes)
	39	{
ec3672b8	40	struct qfprom_priv *priv = context;
01d0d2c4 VG	41	u8 *val = _val;
01d0d2c4 VG	42	int i = 0, words = bytes;
382c62f7 SK	43
382c62f7 SK	44	while (words--)
ec3672b8	45	writeb(*val++, priv->base + reg + i++);
382c62f7 SK	46
	47	return 0;
	48	}
4ab11996 SK	49
	50	static int qfprom_remove(struct platform_device *pdev)
	51	{
	52	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
	53
	54	return nvmem_unregister(nvmem);
	55	}
	56
382c62f7 SK	57	static struct nvmem_config econfig = {
382c62f7 SK	58	.name = "qfprom",
01d0d2c4	59	.stride = 1,
382c62f7 SK	60	.word_size = 1,
	61	.reg_read = qfprom_reg_read,
	62	.reg_write = qfprom_reg_write,
	63	};
	64
4ab11996 SK	65	static int qfprom_probe(struct platform_device *pdev)
	66	{
	67	struct device *dev = &pdev->dev;
	68	struct resource *res;
	69	struct nvmem_device *nvmem;
ec3672b8 MY	70	struct qfprom_priv *priv;
	71
	72	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	73	if (!priv)
	74	return -ENOMEM;
4ab11996 SK	75
4ab11996 SK	76	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ec3672b8 MY	77	priv->base = devm_ioremap_resource(dev, res);
	78	if (IS_ERR(priv->base))
	79	return PTR_ERR(priv->base);
4ab11996	80
382c62f7	81	econfig.size = resource_size(res);
4ab11996	82	econfig.dev = dev;
ec3672b8	83	econfig.priv = priv;
382c62f7	84
4ab11996 SK	85	nvmem = nvmem_register(&econfig);
	86	if (IS_ERR(nvmem))
	87	return PTR_ERR(nvmem);
	88
	89	platform_set_drvdata(pdev, nvmem);
	90
	91	return 0;
	92	}
	93
	94	static const struct of_device_id qfprom_of_match[] = {
	95	{ .compatible = "qcom,qfprom",},
	96	{/* sentinel */},
	97	};
	98	MODULE_DEVICE_TABLE(of, qfprom_of_match);
	99
	100	static struct platform_driver qfprom_driver = {
	101	.probe = qfprom_probe,
	102	.remove = qfprom_remove,
	103	.driver = {
	104	.name = "qcom,qfprom",
	105	.of_match_table = qfprom_of_match,
	106	},
	107	};
	108	module_platform_driver(qfprom_driver);
	109	MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
	110	MODULE_DESCRIPTION("Qualcomm QFPROM driver");
	111	MODULE_LICENSE("GPL v2");