[mirror_ubuntu-jammy-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/mod_devicetable.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 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 = devm_nvmem_register(dev, &econfig);

	return PTR_ERR_OR_ZERO(nvmem);
}

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,
	.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>
ac316725	16	#include <linux/mod_devicetable.h>
382c62f7	17	#include <linux/io.h>
4ab11996 SK	18	#include <linux/nvmem-provider.h>
4ab11996 SK	19	#include <linux/platform_device.h>
4ab11996	20
ec3672b8 MY	21	struct qfprom_priv {
	22	void __iomem *base;
	23	};
	24
382c62f7 SK	25	static int qfprom_reg_read(void *context,
	26	unsigned int reg, void *_val, size_t bytes)
	27	{
ec3672b8	28	struct qfprom_priv *priv = context;
01d0d2c4 VG	29	u8 *val = _val;
01d0d2c4 VG	30	int i = 0, words = bytes;
4ab11996	31
382c62f7	32	while (words--)
ec3672b8	33	*val++ = readb(priv->base + reg + i++);
382c62f7 SK	34
	35	return 0;
	36	}
	37
	38	static int qfprom_reg_write(void *context,
	39	unsigned int reg, void *_val, size_t bytes)
	40	{
ec3672b8	41	struct qfprom_priv *priv = context;
01d0d2c4 VG	42	u8 *val = _val;
01d0d2c4 VG	43	int i = 0, words = bytes;
382c62f7 SK	44
382c62f7 SK	45	while (words--)
ec3672b8	46	writeb(*val++, priv->base + reg + i++);
382c62f7 SK	47
	48	return 0;
	49	}
4ab11996	50
382c62f7 SK	51	static struct nvmem_config econfig = {
382c62f7 SK	52	.name = "qfprom",
01d0d2c4	53	.stride = 1,
382c62f7 SK	54	.word_size = 1,
	55	.reg_read = qfprom_reg_read,
	56	.reg_write = qfprom_reg_write,
	57	};
	58
4ab11996 SK	59	static int qfprom_probe(struct platform_device *pdev)
	60	{
	61	struct device *dev = &pdev->dev;
	62	struct resource *res;
	63	struct nvmem_device *nvmem;
ec3672b8 MY	64	struct qfprom_priv *priv;
	65
	66	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	67	if (!priv)
	68	return -ENOMEM;
4ab11996 SK	69
4ab11996 SK	70	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ec3672b8 MY	71	priv->base = devm_ioremap_resource(dev, res);
	72	if (IS_ERR(priv->base))
	73	return PTR_ERR(priv->base);
4ab11996	74
382c62f7	75	econfig.size = resource_size(res);
4ab11996	76	econfig.dev = dev;
ec3672b8	77	econfig.priv = priv;
382c62f7	78
e5692efe	79	nvmem = devm_nvmem_register(dev, &econfig);
4ab11996	80
e5692efe	81	return PTR_ERR_OR_ZERO(nvmem);
4ab11996 SK	82	}
	83
	84	static const struct of_device_id qfprom_of_match[] = {
	85	{ .compatible = "qcom,qfprom",},
	86	{/* sentinel */},
	87	};
	88	MODULE_DEVICE_TABLE(of, qfprom_of_match);
	89
	90	static struct platform_driver qfprom_driver = {
	91	.probe = qfprom_probe,
4ab11996 SK	92	.driver = {
	93	.name = "qcom,qfprom",
	94	.of_match_table = qfprom_of_match,
	95	},
	96	};
	97	module_platform_driver(qfprom_driver);
	98	MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
	99	MODULE_DESCRIPTION("Qualcomm QFPROM driver");
	100	MODULE_LICENSE("GPL v2");