fb5af7d540
There is a spelling mistake of 'absense' in comments which should be 'absence'. Link: https://lore.kernel.org/all/fca25741-c89f-43ea-95af-5e3232d513fc@arm.com/ Signed-off-by: WangYuli <wangyuli@uniontech.com> Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on linux/arch/arm/mm/dma-mapping.c
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*
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* Copyright (C) 2000-2004 Russell King
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*/
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#include <linux/dma-map-ops.h>
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#include <asm/cachetype.h>
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#include <asm/cacheflush.h>
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#include <asm/outercache.h>
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#include <asm/cp15.h>
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#include "dma.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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dmac_map_area(__va(paddr), size, dir);
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if (dir == DMA_FROM_DEVICE)
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outer_inv_range(paddr, paddr + size);
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else
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outer_clean_range(paddr, paddr + size);
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}
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void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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if (dir != DMA_TO_DEVICE) {
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outer_inv_range(paddr, paddr + size);
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dmac_unmap_area(__va(paddr), size, dir);
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}
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}
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void arch_setup_dma_ops(struct device *dev, bool coherent)
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{
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if (IS_ENABLED(CONFIG_CPU_V7M)) {
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/*
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* Cache support for v7m is optional, so can be treated as
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* coherent if no cache has been detected. Note that it is not
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* enough to check if MPU is in use or not since in absence of
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* MPU system memory map is used.
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*/
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dev->dma_coherent = cacheid ? coherent : true;
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} else {
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/*
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* Assume coherent DMA in case MMU/MPU has not been set up.
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*/
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dev->dma_coherent = (get_cr() & CR_M) ? coherent : true;
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}
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}
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