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6dfdf673cc
This switches to using common code for the DMA allocations, including potential use of the CMA allocator if configured. Switching to the generic code enables DMA allocations from atomic context, which is required by the DMA API documentation, and also adds various other minor features drivers start relying upon. It also makes sure we have on tested code base for all architectures that require uncached pte bits for coherent DMA allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Rich Felker <dalias@libc.org>
33 lines
786 B
C
33 lines
786 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2004 - 2007 Paul Mundt
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*/
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#include <linux/mm.h>
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#include <linux/dma-noncoherent.h>
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#include <asm/cacheflush.h>
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#include <asm/addrspace.h>
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void arch_dma_prep_coherent(struct page *page, size_t size)
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{
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__flush_purge_region(page_address(page), size);
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}
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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 = sh_cacheop_vaddr(phys_to_virt(paddr));
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switch (dir) {
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case DMA_FROM_DEVICE: /* invalidate only */
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__flush_invalidate_region(addr, size);
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break;
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case DMA_TO_DEVICE: /* writeback only */
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__flush_wback_region(addr, size);
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break;
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case DMA_BIDIRECTIONAL: /* writeback and invalidate */
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__flush_purge_region(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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