58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
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/*
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* Dma override functions
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*
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* Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)
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#include <soc/tegra/chip-id.h>
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#include <linux/dma-override.h>
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static bool is_t19x;
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void dma_qualify_ioprot(enum dma_data_direction dir, unsigned long *ioprot)
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{
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if (is_t19x && (dir & DMA_FOR_NVLINK)) {
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*ioprot |= DMA_FOR_NVLINK;
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*ioprot &= ~IOMMU_CACHE;
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}
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}
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void dma_marshal_handle(enum dma_data_direction dir, dma_addr_t *handle)
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{
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if (is_t19x && (dir & DMA_FOR_NVLINK))
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*handle |= DMA_FOR_NVLINK;
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}
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void dma_unmarshal_handle(enum dma_data_direction dir, dma_addr_t *handle)
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{
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if (is_t19x && (dir & DMA_FOR_NVLINK))
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*handle &= ~DMA_FOR_NVLINK;
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}
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static int __init dma_override(void)
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{
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if (tegra_get_chipid() == TEGRA_CHIPID_TEGRA19)
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is_t19x = true;
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return 0;
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}
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arch_initcall(dma_override);
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#endif
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