[linux-2.6-block.git] / drivers / nvmem / imx-ocotp.c

/*
 * i.MX6 OCOTP fusebox driver
 *
 * Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de>
 *
 * Based on the barebox ocotp driver,
 * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
 *	Orex Computed Radiography
 *
 * 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.
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

struct ocotp_priv {
	struct device *dev;
	struct clk *clk;
	void __iomem *base;
	unsigned int nregs;
};

static int imx_ocotp_read(void *context, unsigned int offset,
			  void *val, size_t bytes)
{
	struct ocotp_priv *priv = context;
	unsigned int count;
	u32 *buf = val;
	int i, ret;
	u32 index;

	index = offset >> 2;
	count = bytes >> 2;

	if (count > (priv->nregs - index))
		count = priv->nregs - index;

	ret = clk_prepare_enable(priv->clk);
	if (ret < 0) {
		dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
		return ret;
	}
	for (i = index; i < (index + count); i++)
		*buf++ = readl(priv->base + 0x400 + i * 0x10);

	clk_disable_unprepare(priv->clk);

	return 0;
}

static struct nvmem_config imx_ocotp_nvmem_config = {
	.name = "imx-ocotp",
	.read_only = true,
	.word_size = 4,
	.stride = 4,
	.owner = THIS_MODULE,
	.reg_read = imx_ocotp_read,
};

static const struct of_device_id imx_ocotp_dt_ids[] = {
	{ .compatible = "fsl,imx6q-ocotp",  (void *)128 },
	{ .compatible = "fsl,imx6sl-ocotp", (void *)32 },
	{ .compatible = "fsl,imx6sx-ocotp", (void *)128 },
	{ },
};
MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids);

static int imx_ocotp_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id;
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct ocotp_priv *priv;
	struct nvmem_device *nvmem;

	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);

	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk))
		return PTR_ERR(priv->clk);

	of_id = of_match_device(imx_ocotp_dt_ids, dev);
	priv->nregs = (unsigned long)of_id->data;
	imx_ocotp_nvmem_config.size = 4 * priv->nregs;
	imx_ocotp_nvmem_config.dev = dev;
	imx_ocotp_nvmem_config.priv = priv;
	nvmem = nvmem_register(&imx_ocotp_nvmem_config);
	if (IS_ERR(nvmem))
		return PTR_ERR(nvmem);

	platform_set_drvdata(pdev, nvmem);

	return 0;
}

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

	return nvmem_unregister(nvmem);
}

static struct platform_driver imx_ocotp_driver = {
	.probe	= imx_ocotp_probe,
	.remove	= imx_ocotp_remove,
	.driver = {
		.name	= "imx_ocotp",
		.of_match_table = imx_ocotp_dt_ids,
	},
};
module_platform_driver(imx_ocotp_driver);

MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3edba6b4 PZ	1	/*
	2	* i.MX6 OCOTP fusebox driver
	3	*
	4	* Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de>
	5	*
	6	* Based on the barebox ocotp driver,
	7	* Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
	8	* Orex Computed Radiography
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2
	12	* as published by the Free Software Foundation.
	13	*
	14	* http://www.opensource.org/licenses/gpl-license.html
	15	* http://www.gnu.org/copyleft/gpl.html
	16	*/
	17
deb31970	18	#include <linux/clk.h>
3edba6b4 PZ	19	#include <linux/device.h>
	20	#include <linux/io.h>
	21	#include <linux/module.h>
	22	#include <linux/nvmem-provider.h>
	23	#include <linux/of.h>
	24	#include <linux/of_device.h>
	25	#include <linux/platform_device.h>
3edba6b4 PZ	26	#include <linux/slab.h>
	27
	28	struct ocotp_priv {
	29	struct device *dev;
deb31970	30	struct clk *clk;
3edba6b4 PZ	31	void __iomem *base;
	32	unsigned int nregs;
	33	};
	34
33e5e29c SK	35	static int imx_ocotp_read(void *context, unsigned int offset,
33e5e29c SK	36	void *val, size_t bytes)
3edba6b4 PZ	37	{
3edba6b4 PZ	38	struct ocotp_priv *priv = context;
3edba6b4	39	unsigned int count;
33e5e29c	40	u32 *buf = val;
deb31970	41	int i, ret;
3edba6b4 PZ	42	u32 index;
	43
	44	index = offset >> 2;
33e5e29c	45	count = bytes >> 2;
3edba6b4 PZ	46
	47	if (count > (priv->nregs - index))
	48	count = priv->nregs - index;
	49
deb31970 PF	50	ret = clk_prepare_enable(priv->clk);
	51	if (ret < 0) {
	52	dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
	53	return ret;
	54	}
33e5e29c SK	55	for (i = index; i < (index + count); i++)
33e5e29c SK	56	buf++ = readl(priv->base + 0x400 + i 0x10);
3edba6b4	57
deb31970 PF	58	clk_disable_unprepare(priv->clk);
deb31970 PF	59
c7e3c5f8	60	return 0;
3edba6b4 PZ	61	}
3edba6b4 PZ	62
3edba6b4 PZ	63	static struct nvmem_config imx_ocotp_nvmem_config = {
	64	.name = "imx-ocotp",
	65	.read_only = true,
33e5e29c SK	66	.word_size = 4,
33e5e29c SK	67	.stride = 4,
3edba6b4	68	.owner = THIS_MODULE,
33e5e29c	69	.reg_read = imx_ocotp_read,
3edba6b4 PZ	70	};
	71
	72	static const struct of_device_id imx_ocotp_dt_ids[] = {
	73	{ .compatible = "fsl,imx6q-ocotp", (void *)128 },
	74	{ .compatible = "fsl,imx6sl-ocotp", (void *)32 },
	75	{ .compatible = "fsl,imx6sx-ocotp", (void *)128 },
	76	{ },
	77	};
	78	MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids);
	79
	80	static int imx_ocotp_probe(struct platform_device *pdev)
	81	{
	82	const struct of_device_id *of_id;
	83	struct device *dev = &pdev->dev;
	84	struct resource *res;
3edba6b4 PZ	85	struct ocotp_priv *priv;
	86	struct nvmem_device *nvmem;
	87
	88	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	89	if (!priv)
	90	return -ENOMEM;
	91
	92	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	93	priv->base = devm_ioremap_resource(dev, res);
	94	if (IS_ERR(priv->base))
	95	return PTR_ERR(priv->base);
	96
deb31970 PF	97	priv->clk = devm_clk_get(&pdev->dev, NULL);
	98	if (IS_ERR(priv->clk))
	99	return PTR_ERR(priv->clk);
	100
3edba6b4	101	of_id = of_match_device(imx_ocotp_dt_ids, dev);
e2402b1d	102	priv->nregs = (unsigned long)of_id->data;
33e5e29c	103	imx_ocotp_nvmem_config.size = 4 * priv->nregs;
3edba6b4	104	imx_ocotp_nvmem_config.dev = dev;
33e5e29c	105	imx_ocotp_nvmem_config.priv = priv;
3edba6b4 PZ	106	nvmem = nvmem_register(&imx_ocotp_nvmem_config);
	107	if (IS_ERR(nvmem))
	108	return PTR_ERR(nvmem);
	109
	110	platform_set_drvdata(pdev, nvmem);
	111
	112	return 0;
	113	}
	114
	115	static int imx_ocotp_remove(struct platform_device *pdev)
	116	{
	117	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
	118
	119	return nvmem_unregister(nvmem);
	120	}
	121
	122	static struct platform_driver imx_ocotp_driver = {
	123	.probe = imx_ocotp_probe,
	124	.remove = imx_ocotp_remove,
	125	.driver = {
	126	.name = "imx_ocotp",
	127	.of_match_table = imx_ocotp_dt_ids,
	128	},
	129	};
	130	module_platform_driver(imx_ocotp_driver);
	131
	132	MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
	133	MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver");
	134	MODULE_LICENSE("GPL v2");