| Mikael Olsson | 9c999fd | 2023-10-30 11:05:39 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * SPDX-FileCopyrightText: Copyright 2023 Arm Limited and/or its affiliates <open-source-office@arm.com> |
| 3 | * SPDX-License-Identifier: GPL-2.0-only |
| 4 | * |
| 5 | * This program is free software and is provided to you under the terms of the |
| 6 | * GNU General Public License version 2 as published by the Free Software |
| 7 | * Foundation, and any use by you of this program is subject to the terms |
| 8 | * of such GNU licence. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, you can access it online at |
| 17 | * http://www.gnu.org/licenses/gpl-2.0.html. |
| 18 | */ |
| 19 | |
| 20 | /**************************************************************************** |
| 21 | * Includes |
| 22 | ****************************************************************************/ |
| 23 | |
| 24 | #include "ethosu_dma_mem.h" |
| 25 | |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/dma-mapping.h> |
| 28 | |
| 29 | /**************************************************************************** |
| 30 | * Functions |
| 31 | ****************************************************************************/ |
| 32 | |
| 33 | struct ethosu_dma_mem *ethosu_dma_mem_alloc(struct device *dev, |
| 34 | size_t size) |
| 35 | { |
| 36 | struct ethosu_dma_mem *dma_mem; |
| 37 | |
| 38 | if (!size) |
| 39 | return ERR_PTR(-EINVAL); |
| 40 | |
| 41 | dma_mem = devm_kzalloc(dev, sizeof(*dma_mem), GFP_KERNEL); |
| 42 | if (!dma_mem) |
| 43 | return ERR_PTR(-ENOMEM); |
| 44 | |
| 45 | dma_mem->dev = dev; |
| 46 | dma_mem->size = size; |
| 47 | dma_mem->cpu_addr = dma_alloc_coherent(dev, size, &dma_mem->dma_addr, |
| 48 | GFP_KERNEL); |
| 49 | if (!dma_mem->cpu_addr) { |
| 50 | memset(dma_mem, 0, sizeof(*dma_mem)); |
| 51 | devm_kfree(dev, dma_mem); |
| 52 | |
| 53 | return ERR_PTR(-ENOMEM); |
| 54 | } |
| 55 | |
| 56 | return dma_mem; |
| 57 | } |
| 58 | |
| 59 | void ethosu_dma_mem_free(struct ethosu_dma_mem **dma_mem) |
| 60 | { |
| 61 | struct device *dev; |
| 62 | struct ethosu_dma_mem *mem; |
| 63 | |
| 64 | if (!dma_mem || !*dma_mem) |
| 65 | return; |
| 66 | |
| 67 | mem = *dma_mem; |
| 68 | dev = mem->dev; |
| 69 | |
| 70 | memset(mem->cpu_addr, 0, mem->size); |
| 71 | dma_free_coherent(dev, mem->size, mem->cpu_addr, mem->dma_addr); |
| 72 | |
| 73 | memset(mem, 0, sizeof(*mem)); |
| 74 | devm_kfree(dev, mem); |
| 75 | |
| 76 | *dma_mem = NULL; |
| 77 | } |