92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2009 Wind River Systems Inc
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* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
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*
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* Based on DMA code from MIPS.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/cache.h>
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#include <asm/cacheflush.h>
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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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void *vaddr = phys_to_virt(paddr);
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switch (dir) {
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case DMA_FROM_DEVICE:
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invalidate_dcache_range((unsigned long)vaddr,
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(unsigned long)(vaddr + size));
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break;
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case DMA_TO_DEVICE:
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/*
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* We just need to flush the caches here , but Nios2 flush
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* instruction will do both writeback and invalidate.
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*/
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case DMA_BIDIRECTIONAL: /* flush and invalidate */
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flush_dcache_range((unsigned long)vaddr,
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(unsigned long)(vaddr + 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_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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void *vaddr = phys_to_virt(paddr);
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switch (dir) {
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case DMA_BIDIRECTIONAL:
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case DMA_FROM_DEVICE:
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invalidate_dcache_range((unsigned long)vaddr,
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(unsigned long)(vaddr + size));
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break;
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case DMA_TO_DEVICE:
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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_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs)
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{
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void *ret;
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/* optimized page clearing */
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gfp |= __GFP_ZERO;
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if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
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gfp |= GFP_DMA;
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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*dma_handle = virt_to_phys(ret);
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flush_dcache_range((unsigned long) ret,
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(unsigned long) ret + size);
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ret = UNCAC_ADDR(ret);
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}
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return ret;
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}
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void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle, unsigned long attrs)
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{
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unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
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free_pages(addr, get_order(size));
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}
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