1/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs 2 * 3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#include <linux/types.h> 13#include <linux/dma-mapping.h> 14#include <linux/list.h> 15#include <linux/pci.h> 16#include <linux/highmem.h> 17#include <linux/scatterlist.h> 18#include <asm/io.h> 19 20void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp) 21{ 22 void *ret; 23 24 ret = consistent_alloc(gfp, size, dma_handle); 25 if (ret) 26 memset(ret, 0, size); 27 28 return ret; 29} 30 31EXPORT_SYMBOL(dma_alloc_coherent); 32 33void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle) 34{ 35 consistent_free(vaddr); 36} 37 38EXPORT_SYMBOL(dma_free_coherent); 39 40dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, 41 enum dma_data_direction direction) 42{ 43 BUG_ON(direction == DMA_NONE); 44 45 frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size); 46 47 return virt_to_bus(ptr); 48} 49 50EXPORT_SYMBOL(dma_map_single); 51 52int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, 53 enum dma_data_direction direction) 54{ 55 unsigned long dampr2; 56 void *vaddr; 57 int i; 58 59 BUG_ON(direction == DMA_NONE); 60 61 dampr2 = __get_DAMPR(2); 62 63 for (i = 0; i < nents; i++) { 64 vaddr = kmap_atomic(sg_page(&sg[i]), __KM_CACHE); 65 66 frv_dcache_writeback((unsigned long) vaddr, 67 (unsigned long) vaddr + PAGE_SIZE); 68 69 } 70 71 kunmap_atomic(vaddr, __KM_CACHE); 72 if (dampr2) { 73 __set_DAMPR(2, dampr2); 74 __set_IAMPR(2, dampr2); 75 } 76 77 return nents; 78} 79 80EXPORT_SYMBOL(dma_map_sg); 81 82dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, 83 size_t size, enum dma_data_direction direction) 84{ 85 BUG_ON(direction == DMA_NONE); 86 flush_dcache_page(page); 87 return (dma_addr_t) page_to_phys(page) + offset; 88} 89 90EXPORT_SYMBOL(dma_map_page); 91