mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
1.8 KiB
80 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Apple SoC eFuse driver |
|
* |
|
* Copyright (C) The Asahi Linux Contributors |
|
*/ |
|
|
|
#include <linux/io.h> |
|
#include <linux/mod_devicetable.h> |
|
#include <linux/module.h> |
|
#include <linux/nvmem-provider.h> |
|
#include <linux/platform_device.h> |
|
|
|
struct apple_efuses_priv { |
|
void __iomem *fuses; |
|
}; |
|
|
|
static int apple_efuses_read(void *context, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct apple_efuses_priv *priv = context; |
|
u32 *dst = val; |
|
|
|
while (bytes >= sizeof(u32)) { |
|
*dst++ = readl_relaxed(priv->fuses + offset); |
|
bytes -= sizeof(u32); |
|
offset += sizeof(u32); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int apple_efuses_probe(struct platform_device *pdev) |
|
{ |
|
struct apple_efuses_priv *priv; |
|
struct resource *res; |
|
struct nvmem_config config = { |
|
.dev = &pdev->dev, |
|
.read_only = true, |
|
.reg_read = apple_efuses_read, |
|
.stride = sizeof(u32), |
|
.word_size = sizeof(u32), |
|
.name = "apple_efuses_nvmem", |
|
.id = NVMEM_DEVID_AUTO, |
|
.root_only = true, |
|
}; |
|
|
|
priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL); |
|
if (!priv) |
|
return -ENOMEM; |
|
|
|
priv->fuses = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
|
if (IS_ERR(priv->fuses)) |
|
return PTR_ERR(priv->fuses); |
|
|
|
config.priv = priv; |
|
config.size = resource_size(res); |
|
|
|
return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config)); |
|
} |
|
|
|
static const struct of_device_id apple_efuses_of_match[] = { |
|
{ .compatible = "apple,efuses", }, |
|
{} |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(of, apple_efuses_of_match); |
|
|
|
static struct platform_driver apple_efuses_driver = { |
|
.driver = { |
|
.name = "apple_efuses", |
|
.of_match_table = apple_efuses_of_match, |
|
}, |
|
.probe = apple_efuses_probe, |
|
}; |
|
|
|
module_platform_driver(apple_efuses_driver); |
|
|
|
MODULE_AUTHOR("Sven Peter <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|