forked from Minki/linux
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/mod_devicetable.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/nvmem-provider.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
|
||
|
|
struct brcm_nvram {
|
||
|
|
struct device *dev;
|
||
|
|
void __iomem *base;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int brcm_nvram_read(void *context, unsigned int offset, void *val,
|
||
|
|
size_t bytes)
|
||
|
|
{
|
||
|
|
struct brcm_nvram *priv = context;
|
||
|
|
u8 *dst = val;
|
||
|
|
|
||
|
|
while (bytes--)
|
||
|
|
*dst++ = readb(priv->base + offset++);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int brcm_nvram_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct nvmem_config config = {
|
||
|
|
.name = "brcm-nvram",
|
||
|
|
.reg_read = brcm_nvram_read,
|
||
|
|
};
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct resource *res;
|
||
|
|
struct brcm_nvram *priv;
|
||
|
|
|
||
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
||
|
|
if (!priv)
|
||
|
|
return -ENOMEM;
|
||
|
|
priv->dev = dev;
|
||
|
|
|
||
|
|
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);
|
||
|
|
|
||
|
|
config.dev = dev;
|
||
|
|
config.priv = priv;
|
||
|
|
config.size = resource_size(res);
|
||
|
|
|
||
|
|
return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id brcm_nvram_of_match_table[] = {
|
||
|
|
{ .compatible = "brcm,nvram", },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct platform_driver brcm_nvram_driver = {
|
||
|
|
.probe = brcm_nvram_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "brcm_nvram",
|
||
|
|
.of_match_table = brcm_nvram_of_match_table,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init brcm_nvram_init(void)
|
||
|
|
{
|
||
|
|
return platform_driver_register(&brcm_nvram_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
subsys_initcall_sync(brcm_nvram_init);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Rafał Miłecki");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);
|