144 строки
3.5 KiB
C
144 строки
3.5 KiB
C
/*
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* Copyright (C) 2011 Texas Instruments Incorporated
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* Author: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/mm_types.h>
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#include <linux/scatterlist.h>
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#include <asm/cacheflush.h>
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static void c6x_dma_sync(dma_addr_t handle, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long paddr = handle;
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BUG_ON(!valid_dma_direction(dir));
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switch (dir) {
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case DMA_FROM_DEVICE:
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L2_cache_block_invalidate(paddr, paddr + size);
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break;
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case DMA_TO_DEVICE:
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L2_cache_block_writeback(paddr, paddr + size);
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break;
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case DMA_BIDIRECTIONAL:
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L2_cache_block_writeback_invalidate(paddr, paddr + size);
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break;
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default:
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break;
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}
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}
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static dma_addr_t c6x_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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dma_addr_t handle = virt_to_phys(page_address(page) + offset);
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c6x_dma_sync(handle, size, dir);
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return handle;
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}
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static void c6x_dma_unmap_page(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir, unsigned long attrs)
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{
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c6x_dma_sync(handle, size, dir);
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}
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static int c6x_dma_map_sg(struct device *dev, struct scatterlist *sglist,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sglist, sg, nents, i) {
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sg->dma_address = sg_phys(sg);
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c6x_dma_sync(sg->dma_address, sg->length, dir);
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}
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return nents;
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}
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static void c6x_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sglist, sg, nents, i)
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c6x_dma_sync(sg_dma_address(sg), sg->length, dir);
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}
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static void c6x_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir)
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{
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c6x_dma_sync(handle, size, dir);
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}
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static void c6x_dma_sync_single_for_device(struct device *dev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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c6x_dma_sync(handle, size, dir);
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}
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static void c6x_dma_sync_sg_for_cpu(struct device *dev,
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struct scatterlist *sglist, int nents,
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enum dma_data_direction dir)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sglist, sg, nents, i)
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c6x_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
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sg->length, dir);
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}
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static void c6x_dma_sync_sg_for_device(struct device *dev,
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struct scatterlist *sglist, int nents,
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enum dma_data_direction dir)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sglist, sg, nents, i)
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c6x_dma_sync_single_for_device(dev, sg_dma_address(sg),
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sg->length, dir);
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}
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struct dma_map_ops c6x_dma_ops = {
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.alloc = c6x_dma_alloc,
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.free = c6x_dma_free,
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.map_page = c6x_dma_map_page,
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.unmap_page = c6x_dma_unmap_page,
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.map_sg = c6x_dma_map_sg,
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.unmap_sg = c6x_dma_unmap_sg,
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.sync_single_for_device = c6x_dma_sync_single_for_device,
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.sync_single_for_cpu = c6x_dma_sync_single_for_cpu,
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.sync_sg_for_device = c6x_dma_sync_sg_for_device,
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.sync_sg_for_cpu = c6x_dma_sync_sg_for_cpu,
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};
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EXPORT_SYMBOL(c6x_dma_ops);
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/* Number of entries preallocated for DMA-API debugging */
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#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
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static int __init dma_init(void)
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{
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dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
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return 0;
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}
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fs_initcall(dma_init);
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