67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2009-2010 PetaLogix
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
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*
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* Provide default implementations of the DMA mapping callbacks for
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* directly mapped busses.
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*/
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#include <linux/device.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/gfp.h>
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#include <linux/dma-debug.h>
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#include <linux/export.h>
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#include <linux/bug.h>
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#include <asm/cacheflush.h>
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static void __dma_sync(struct device *dev, phys_addr_t paddr, size_t size,
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enum dma_data_direction direction)
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{
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switch (direction) {
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case DMA_TO_DEVICE:
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case DMA_BIDIRECTIONAL:
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flush_dcache_range(paddr, paddr + size);
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break;
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case DMA_FROM_DEVICE:
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invalidate_dcache_range(paddr, paddr + 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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void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_sync(dev, paddr, size, dir);
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}
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_sync(dev, paddr, size, dir);
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}
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int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t handle, size_t size,
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unsigned long attrs)
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{
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#ifdef CONFIG_MMU
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unsigned long user_count = vma_pages(vma);
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unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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unsigned long off = vma->vm_pgoff;
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unsigned long pfn;
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if (off >= count || user_count > (count - off))
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return -ENXIO;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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pfn = consistent_virt_to_pfn(cpu_addr);
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return remap_pfn_range(vma, vma->vm_start, pfn + off,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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#else
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return -ENXIO;
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#endif
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}
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