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// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx ZynqMP SecureFw Driver.
* Copyright (c) 2018 Xilinx Inc.
*/
#include <asm/cacheflush.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#define ZYNQMP_AES_KEY_SIZE 64
static u8 key[ZYNQMP_AES_KEY_SIZE] = {0};
static dma_addr_t dma_addr;
static u8 *keyptr;
static size_t dma_size;
static char *kbuf;
static const struct zynqmp_eemi_ops *eemi_ops;
static ssize_t secure_load_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
const struct firmware *fw;
char image_name[NAME_MAX];
u64 dst, ret;
int len;
if (IS_ERR(eemi_ops) || !eemi_ops->secure_image)
return -EFAULT;
strncpy(image_name, buf, NAME_MAX);
len = strlen(image_name);
if (image_name[len - 1] == '\n')
image_name[len - 1] = 0;
ret = request_firmware(&fw, image_name, dev);
if (ret) {
dev_err(dev, "Error requesting firmware %s\n", image_name);
return ret;
}
dma_size = fw->size;
if (keyptr)
dma_size = fw->size + ZYNQMP_AES_KEY_SIZE;
kbuf = dma_alloc_coherent(dev, dma_size,
&dma_addr, GFP_KERNEL);
if (!kbuf)
return -ENOMEM;
memcpy(kbuf, fw->data, fw->size);
if (keyptr)
memcpy(kbuf + fw->size, key, ZYNQMP_AES_KEY_SIZE);
/* To ensure cache coherency */
__flush_cache_user_range((unsigned long)kbuf,
(unsigned long)kbuf + dma_size);
release_firmware(fw);
if (keyptr)
ret = eemi_ops->secure_image(dma_addr, dma_addr + fw->size,
&dst);
else
ret = eemi_ops->secure_image(dma_addr, 0, &dst);
if (ret) {
dev_info(dev, "Failed to load secure image \r\n");
return ret;
}
dev_info(dev, "Verified image at 0x%llx\n", dst);
return count;
}
static ssize_t key_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, ZYNQMP_AES_KEY_SIZE + 1, "%s\n", key);
}
static ssize_t key_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
memcpy(key, buf, count);
keyptr = &key[0];
return count;
}
static ssize_t secure_load_done_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned int value;
ret = kstrtouint(buf, 10, &value);
if (ret)
return ret;
if (value)
dma_free_coherent(dev, dma_size, kbuf, dma_addr);
return count;
}
static DEVICE_ATTR_RW(key);
static DEVICE_ATTR_WO(secure_load);
static DEVICE_ATTR_WO(secure_load_done);
static struct attribute *securefw_attrs[] = {
&dev_attr_secure_load_done.attr,
&dev_attr_secure_load.attr,
&dev_attr_key.attr,
NULL,
};
ATTRIBUTE_GROUPS(securefw);
static int securefw_probe(struct platform_device *pdev)
{
int ret;
struct platform_device *securefw_pdev;
eemi_ops = zynqmp_pm_get_eemi_ops();
if (IS_ERR(eemi_ops))
return PTR_ERR(eemi_ops);
securefw_pdev = pdev;
securefw_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
ret = of_dma_configure(&securefw_pdev->dev, NULL, true);
if (ret < 0) {
dev_info(&securefw_pdev->dev, "Cannot setup DMA ops\r\n");
return ret;
}
ret = sysfs_create_groups(&securefw_pdev->dev.kobj, securefw_groups);
if (ret)
return ret;
dev_info(&securefw_pdev->dev, "securefw probed\r\n");
return ret;
}
static int securefw_remove(struct platform_device *pdev)
{
sysfs_remove_groups(&pdev->dev.kobj, securefw_groups);
return 0;
}
static struct platform_driver securefw_driver = {
.driver = {
.name = "securefw",
},
.probe = securefw_probe,
.remove = securefw_remove,
};
static struct platform_device *securefw_dev_reg;
static int __init zynqmp_secure_init(void)
{
int ret;
ret = platform_driver_register(&securefw_driver);
if (ret)
return ret;
securefw_dev_reg = platform_device_register_simple("securefw", -1,
NULL, 0);
if (IS_ERR(securefw_dev_reg)) {
ret = PTR_ERR(securefw_dev_reg);
platform_driver_unregister(&securefw_driver);
return ret;
}
return 0;
}
static void __exit zynqmp_secure_exit(void)
{
platform_device_unregister(securefw_dev_reg);
platform_driver_unregister(&securefw_driver);
}
module_init(zynqmp_secure_init);
module_exit(zynqmp_secure_exit);
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