98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
|
/*
|
||
|
|
* UniPhier eFuse driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2017 Socionext Inc.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* 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/io.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/nvmem-provider.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
|
||
|
|
struct uniphier_efuse_priv {
|
||
|
|
void __iomem *base;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int uniphier_reg_read(void *context,
|
||
|
|
unsigned int reg, void *_val, size_t bytes)
|
||
|
|
{
|
||
|
|
struct uniphier_efuse_priv *priv = context;
|
||
|
|
u32 *val = _val;
|
||
|
|
int offs;
|
||
|
|
|
||
|
|
for (offs = 0; offs < bytes; offs += sizeof(u32))
|
||
|
|
*val++ = readl(priv->base + reg + offs);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int uniphier_efuse_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct resource *res;
|
||
|
|
struct nvmem_device *nvmem;
|
||
|
|
struct nvmem_config econfig = {};
|
||
|
|
struct uniphier_efuse_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.stride = 4;
|
||
|
|
econfig.word_size = 4;
|
||
|
|
econfig.read_only = true;
|
||
|
|
econfig.reg_read = uniphier_reg_read;
|
||
|
|
econfig.size = resource_size(res);
|
||
|
|
econfig.priv = priv;
|
||
|
|
econfig.dev = dev;
|
||
|
|
nvmem = nvmem_register(&econfig);
|
||
|
|
if (IS_ERR(nvmem))
|
||
|
|
return PTR_ERR(nvmem);
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, nvmem);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int uniphier_efuse_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct nvmem_device *nvmem = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
return nvmem_unregister(nvmem);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id uniphier_efuse_of_match[] = {
|
||
|
|
{ .compatible = "socionext,uniphier-efuse",},
|
||
|
|
{/* sentinel */},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver uniphier_efuse_driver = {
|
||
|
|
.probe = uniphier_efuse_probe,
|
||
|
|
.remove = uniphier_efuse_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "uniphier-efuse",
|
||
|
|
.of_match_table = uniphier_efuse_of_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(uniphier_efuse_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
|
||
|
|
MODULE_DESCRIPTION("UniPhier eFuse driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|