111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/*
|
|
* Amlogic Meson GX eFuse Driver
|
|
*
|
|
* Copyright (c) 2016 Endless Computers, Inc.
|
|
* Author: Carlo Caione <carlo@endlessm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2 of the GNU General Public License 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/clk.h>
|
|
#include <linux/module.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/firmware/meson/meson_sm.h>
|
|
|
|
static int meson_efuse_read(void *context, unsigned int offset,
|
|
void *val, size_t bytes)
|
|
{
|
|
return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset,
|
|
bytes, 0, 0, 0);
|
|
}
|
|
|
|
static int meson_efuse_write(void *context, unsigned int offset,
|
|
void *val, size_t bytes)
|
|
{
|
|
return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset,
|
|
bytes, 0, 0, 0);
|
|
}
|
|
|
|
static const struct of_device_id meson_efuse_match[] = {
|
|
{ .compatible = "amlogic,meson-gxbb-efuse", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, meson_efuse_match);
|
|
|
|
static int meson_efuse_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct nvmem_device *nvmem;
|
|
struct nvmem_config *econfig;
|
|
struct clk *clk;
|
|
unsigned int size;
|
|
int ret;
|
|
|
|
clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(clk)) {
|
|
ret = PTR_ERR(clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "failed to get efuse gate");
|
|
return ret;
|
|
}
|
|
|
|
ret = clk_prepare_enable(clk);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable gate");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(dev,
|
|
(void(*)(void *))clk_disable_unprepare,
|
|
clk);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add disable callback");
|
|
return ret;
|
|
}
|
|
|
|
if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
|
|
dev_err(dev, "failed to get max user");
|
|
return -EINVAL;
|
|
}
|
|
|
|
econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
|
|
if (!econfig)
|
|
return -ENOMEM;
|
|
|
|
econfig->dev = dev;
|
|
econfig->name = dev_name(dev);
|
|
econfig->stride = 1;
|
|
econfig->word_size = 1;
|
|
econfig->reg_read = meson_efuse_read;
|
|
econfig->reg_write = meson_efuse_write;
|
|
econfig->size = size;
|
|
|
|
nvmem = devm_nvmem_register(&pdev->dev, econfig);
|
|
|
|
return PTR_ERR_OR_ZERO(nvmem);
|
|
}
|
|
|
|
static struct platform_driver meson_efuse_driver = {
|
|
.probe = meson_efuse_probe,
|
|
.driver = {
|
|
.name = "meson-efuse",
|
|
.of_match_table = meson_efuse_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(meson_efuse_driver);
|
|
|
|
MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
|
|
MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
|
|
MODULE_LICENSE("GPL v2");
|