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/export.h>
17 #include <linux/highmem.h>
18 #include <linux/scatterlist.h>
19 #include <asm/io.h>
20
dma_alloc_coherent(struct device * hwdev,size_t size,dma_addr_t * dma_handle,gfp_t gfp)21 void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
22 {
23 void *ret;
24
25 ret = consistent_alloc(gfp, size, dma_handle);
26 if (ret)
27 memset(ret, 0, size);
28
29 return ret;
30 }
31
32 EXPORT_SYMBOL(dma_alloc_coherent);
33
dma_free_coherent(struct device * hwdev,size_t size,void * vaddr,dma_addr_t dma_handle)34 void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
35 {
36 consistent_free(vaddr);
37 }
38
39 EXPORT_SYMBOL(dma_free_coherent);
40
dma_map_single(struct device * dev,void * ptr,size_t size,enum dma_data_direction direction)41 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
42 enum dma_data_direction direction)
43 {
44 BUG_ON(direction == DMA_NONE);
45
46 frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
47
48 return virt_to_bus(ptr);
49 }
50
51 EXPORT_SYMBOL(dma_map_single);
52
dma_map_sg(struct device * dev,struct scatterlist * sg,int nents,enum dma_data_direction direction)53 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
54 enum dma_data_direction direction)
55 {
56 unsigned long dampr2;
57 void *vaddr;
58 int i;
59
60 BUG_ON(direction == DMA_NONE);
61
62 dampr2 = __get_DAMPR(2);
63
64 for (i = 0; i < nents; i++) {
65 vaddr = kmap_atomic_primary(sg_page(&sg[i]));
66
67 frv_dcache_writeback((unsigned long) vaddr,
68 (unsigned long) vaddr + PAGE_SIZE);
69
70 }
71
72 kunmap_atomic_primary(vaddr);
73 if (dampr2) {
74 __set_DAMPR(2, dampr2);
75 __set_IAMPR(2, dampr2);
76 }
77
78 return nents;
79 }
80
81 EXPORT_SYMBOL(dma_map_sg);
82
dma_map_page(struct device * dev,struct page * page,unsigned long offset,size_t size,enum dma_data_direction direction)83 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
84 size_t size, enum dma_data_direction direction)
85 {
86 BUG_ON(direction == DMA_NONE);
87 flush_dcache_page(page);
88 return (dma_addr_t) page_to_phys(page) + offset;
89 }
90
91 EXPORT_SYMBOL(dma_map_page);
92