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/*
* SPDX-FileCopyrightText: Copyright 2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
* SPDX-License-Identifier: GPL-2.0-only
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*/
/****************************************************************************
* Includes
****************************************************************************/
#include "ethosu_dma_mem.h"
#include <linux/err.h>
#include <linux/dma-mapping.h>
/****************************************************************************
* Functions
****************************************************************************/
struct ethosu_dma_mem *ethosu_dma_mem_alloc(struct device *dev,
size_t size)
{
struct ethosu_dma_mem *dma_mem;
if (!size)
return ERR_PTR(-EINVAL);
dma_mem = devm_kzalloc(dev, sizeof(*dma_mem), GFP_KERNEL);
if (!dma_mem)
return ERR_PTR(-ENOMEM);
dma_mem->dev = dev;
dma_mem->size = size;
dma_mem->cpu_addr = dma_alloc_coherent(dev, size, &dma_mem->dma_addr,
GFP_KERNEL);
if (!dma_mem->cpu_addr) {
memset(dma_mem, 0, sizeof(*dma_mem));
devm_kfree(dev, dma_mem);
return ERR_PTR(-ENOMEM);
}
return dma_mem;
}
void ethosu_dma_mem_free(struct ethosu_dma_mem **dma_mem)
{
struct device *dev;
struct ethosu_dma_mem *mem;
if (!dma_mem || !*dma_mem)
return;
mem = *dma_mem;
dev = mem->dev;
memset(mem->cpu_addr, 0, mem->size);
dma_free_coherent(dev, mem->size, mem->cpu_addr, mem->dma_addr);
memset(mem, 0, sizeof(*mem));
devm_kfree(dev, mem);
*dma_mem = NULL;
}
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