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44 lines
1.0 KiB
44 lines
1.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* DMA implementation for Hexagon |
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* |
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* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/dma-map-ops.h> |
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#include <linux/memblock.h> |
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#include <asm/page.h> |
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void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, |
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enum dma_data_direction dir) |
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{ |
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void *addr = phys_to_virt(paddr); |
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switch (dir) { |
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case DMA_TO_DEVICE: |
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hexagon_clean_dcache_range((unsigned long) addr, |
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(unsigned long) addr + size); |
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break; |
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case DMA_FROM_DEVICE: |
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hexagon_inv_dcache_range((unsigned long) addr, |
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(unsigned long) addr + size); |
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break; |
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case DMA_BIDIRECTIONAL: |
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flush_dcache_range((unsigned long) addr, |
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(unsigned long) addr + size); |
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break; |
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default: |
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BUG(); |
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} |
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} |
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/* |
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* Our max_low_pfn should have been backed off by 16MB in mm/init.c to create |
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* DMA coherent space. Use that for the pool. |
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*/ |
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static int __init hexagon_dma_init(void) |
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{ |
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return dma_init_global_coherent(PFN_PHYS(max_low_pfn), |
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hexagon_coherent_pool_size); |
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} |
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core_initcall(hexagon_dma_init);
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