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arch/c6x/kernel/dma.c
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14aa7e8bf C6X: memory manag... |
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/* * Copyright (C) 2011 Texas Instruments Incorporated * Author: Mark Salter <msalter@redhat.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/dma-mapping.h> #include <linux/mm.h> #include <linux/mm_types.h> #include <linux/scatterlist.h> #include <asm/cacheflush.h> static void c6x_dma_sync(dma_addr_t handle, size_t size, enum dma_data_direction dir) { unsigned long paddr = handle; BUG_ON(!valid_dma_direction(dir)); switch (dir) { case DMA_FROM_DEVICE: L2_cache_block_invalidate(paddr, paddr + size); break; case DMA_TO_DEVICE: L2_cache_block_writeback(paddr, paddr + size); break; case DMA_BIDIRECTIONAL: L2_cache_block_writeback_invalidate(paddr, paddr + size); break; default: break; } } dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction dir) { dma_addr_t addr = virt_to_phys(ptr); c6x_dma_sync(addr, size, dir); debug_dma_map_page(dev, virt_to_page(ptr), (unsigned long)ptr & ~PAGE_MASK, size, dir, addr, true); return addr; } EXPORT_SYMBOL(dma_map_single); void dma_unmap_single(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { c6x_dma_sync(handle, size, dir); debug_dma_unmap_page(dev, handle, size, dir, true); } EXPORT_SYMBOL(dma_unmap_single); int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction dir) { struct scatterlist *sg; int i; for_each_sg(sglist, sg, nents, i) sg->dma_address = dma_map_single(dev, sg_virt(sg), sg->length, dir); debug_dma_map_sg(dev, sglist, nents, nents, dir); return nents; } EXPORT_SYMBOL(dma_map_sg); void dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction dir) { struct scatterlist *sg; int i; for_each_sg(sglist, sg, nents, i) dma_unmap_single(dev, sg_dma_address(sg), sg->length, dir); debug_dma_unmap_sg(dev, sglist, nents, dir); } EXPORT_SYMBOL(dma_unmap_sg); void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { c6x_dma_sync(handle, size, dir); debug_dma_sync_single_for_cpu(dev, handle, size, dir); } EXPORT_SYMBOL(dma_sync_single_for_cpu); void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { c6x_dma_sync(handle, size, dir); debug_dma_sync_single_for_device(dev, handle, size, dir); } EXPORT_SYMBOL(dma_sync_single_for_device); void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction dir) { struct scatterlist *sg; int i; for_each_sg(sglist, sg, nents, i) dma_sync_single_for_cpu(dev, sg_dma_address(sg), sg->length, dir); debug_dma_sync_sg_for_cpu(dev, sglist, nents, dir); } EXPORT_SYMBOL(dma_sync_sg_for_cpu); void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction dir) { struct scatterlist *sg; int i; for_each_sg(sglist, sg, nents, i) dma_sync_single_for_device(dev, sg_dma_address(sg), sg->length, dir); debug_dma_sync_sg_for_device(dev, sglist, nents, dir); } EXPORT_SYMBOL(dma_sync_sg_for_device); /* Number of entries preallocated for DMA-API debugging */ #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) static int __init dma_init(void) { dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); return 0; } fs_initcall(dma_init); |