ba360fd040
Regmap raw accessors are bus specific implementations, using regmap raw apis in nvmem breaks nvmem providers based on regmap mmio. This patch moves to nvmem support in the driver to use callback instead of regmap, which is what the nvmem core supports now. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
|
|
* Copyright (c) 2015 MediaTek Inc.
|
|
* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
static int mtk_reg_read(void *context,
|
|
unsigned int reg, void *_val, size_t bytes)
|
|
{
|
|
void __iomem *base = context;
|
|
u32 *val = _val;
|
|
int i = 0, words = bytes / 4;
|
|
|
|
while (words--)
|
|
*val++ = readl(base + reg + (i++ * 4));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtk_reg_write(void *context,
|
|
unsigned int reg, void *_val, size_t bytes)
|
|
{
|
|
void __iomem *base = context;
|
|
u32 *val = _val;
|
|
int i = 0, words = bytes / 4;
|
|
|
|
while (words--)
|
|
writel(*val++, base + reg + (i++ * 4));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtk_efuse_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *res;
|
|
struct nvmem_device *nvmem;
|
|
struct nvmem_config *econfig;
|
|
void __iomem *base;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
|
|
if (!econfig)
|
|
return -ENOMEM;
|
|
|
|
econfig->stride = 4;
|
|
econfig->word_size = 4;
|
|
econfig->reg_read = mtk_reg_read;
|
|
econfig->reg_write = mtk_reg_write;
|
|
econfig->size = resource_size(res);
|
|
econfig->priv = base;
|
|
econfig->dev = dev;
|
|
econfig->owner = THIS_MODULE;
|
|
nvmem = nvmem_register(econfig);
|
|
if (IS_ERR(nvmem))
|
|
return PTR_ERR(nvmem);
|
|
|
|
platform_set_drvdata(pdev, nvmem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtk_efuse_remove(struct platform_device *pdev)
|
|
{
|
|
struct nvmem_device *nvmem = platform_get_drvdata(pdev);
|
|
|
|
return nvmem_unregister(nvmem);
|
|
}
|
|
|
|
static const struct of_device_id mtk_efuse_of_match[] = {
|
|
{ .compatible = "mediatek,mt8173-efuse",},
|
|
{ .compatible = "mediatek,efuse",},
|
|
{/* sentinel */},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
|
|
|
|
static struct platform_driver mtk_efuse_driver = {
|
|
.probe = mtk_efuse_probe,
|
|
.remove = mtk_efuse_remove,
|
|
.driver = {
|
|
.name = "mediatek,efuse",
|
|
.of_match_table = mtk_efuse_of_match,
|
|
},
|
|
};
|
|
|
|
static int __init mtk_efuse_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = platform_driver_register(&mtk_efuse_driver);
|
|
if (ret) {
|
|
pr_err("Failed to register efuse driver\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit mtk_efuse_exit(void)
|
|
{
|
|
return platform_driver_unregister(&mtk_efuse_driver);
|
|
}
|
|
|
|
subsys_initcall(mtk_efuse_init);
|
|
module_exit(mtk_efuse_exit);
|
|
|
|
MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
|
|
MODULE_DESCRIPTION("Mediatek EFUSE driver");
|
|
MODULE_LICENSE("GPL v2");
|