155 строки
3.7 KiB
C
155 строки
3.7 KiB
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/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/regmap.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct ocotp_priv {
|
|
struct device *dev;
|
|
void __iomem *base;
|
|
unsigned int nregs;
|
|
};
|
|
|
|
static int imx_ocotp_read(void *context, const void *reg, size_t reg_size,
|
|
void *val, size_t val_size)
|
|
{
|
|
struct ocotp_priv *priv = context;
|
|
unsigned int offset = *(u32 *)reg;
|
|
unsigned int count;
|
|
int i;
|
|
u32 index;
|
|
|
|
index = offset >> 2;
|
|
count = val_size >> 2;
|
|
|
|
if (count > (priv->nregs - index))
|
|
count = priv->nregs - index;
|
|
|
|
for (i = index; i < (index + count); i++) {
|
|
*(u32 *)val = readl(priv->base + 0x400 + i * 0x10);
|
|
val += 4;
|
|
}
|
|
|
|
return (i - index) * 4;
|
|
}
|
|
|
|
static int imx_ocotp_write(void *context, const void *data, size_t count)
|
|
{
|
|
/* Not implemented */
|
|
return 0;
|
|
}
|
|
|
|
static struct regmap_bus imx_ocotp_bus = {
|
|
.read = imx_ocotp_read,
|
|
.write = imx_ocotp_write,
|
|
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
|
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
|
};
|
|
|
|
static bool imx_ocotp_writeable_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static struct regmap_config imx_ocotp_regmap_config = {
|
|
.reg_bits = 32,
|
|
.val_bits = 32,
|
|
.reg_stride = 4,
|
|
.writeable_reg = imx_ocotp_writeable_reg,
|
|
.name = "imx-ocotp",
|
|
};
|
|
|
|
static struct nvmem_config imx_ocotp_nvmem_config = {
|
|
.name = "imx-ocotp",
|
|
.read_only = true,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
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 regmap *regmap;
|
|
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);
|
|
|
|
of_id = of_match_device(imx_ocotp_dt_ids, dev);
|
|
priv->nregs = (unsigned int)of_id->data;
|
|
imx_ocotp_regmap_config.max_register = 4 * priv->nregs - 4;
|
|
|
|
regmap = devm_regmap_init(dev, &imx_ocotp_bus, priv,
|
|
&imx_ocotp_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(dev, "regmap init failed\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
imx_ocotp_nvmem_config.dev = dev;
|
|
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");
|