forked from Minki/linux
83e007a0c6
After the data is read by the secure monitor driver it is being copied in the output buffer checking only the size of the bounce buffer but not the size of the output buffer. Fix this in the secure monitor driver slightly changing the API. Fix also the efuse driver that it is the only driver using this API to not break bisectability. Signed-off-by: Carlo Caione <carlo@endlessm.com> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # for nvmem Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
|
|
* Amlogic 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/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)
|
|
{
|
|
u8 *buf = val;
|
|
int ret;
|
|
|
|
ret = meson_sm_call_read(buf, bytes, SM_EFUSE_READ, offset,
|
|
bytes, 0, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nvmem_config econfig = {
|
|
.name = "meson-efuse",
|
|
.owner = THIS_MODULE,
|
|
.stride = 1,
|
|
.word_size = 1,
|
|
.read_only = true,
|
|
};
|
|
|
|
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 nvmem_device *nvmem;
|
|
unsigned int size;
|
|
|
|
if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0)
|
|
return -EINVAL;
|
|
|
|
econfig.dev = &pdev->dev;
|
|
econfig.reg_read = meson_efuse_read;
|
|
econfig.size = size;
|
|
|
|
nvmem = nvmem_register(&econfig);
|
|
if (IS_ERR(nvmem))
|
|
return PTR_ERR(nvmem);
|
|
|
|
platform_set_drvdata(pdev, nvmem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int meson_efuse_remove(struct platform_device *pdev)
|
|
{
|
|
struct nvmem_device *nvmem = platform_get_drvdata(pdev);
|
|
|
|
return nvmem_unregister(nvmem);
|
|
}
|
|
|
|
static struct platform_driver meson_efuse_driver = {
|
|
.probe = meson_efuse_probe,
|
|
.remove = meson_efuse_remove,
|
|
.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 NVMEM driver");
|
|
MODULE_LICENSE("GPL v2");
|