These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / arch / frv / mb93090-mb00 / pci-dma.c
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
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
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
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
53 int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
54                enum dma_data_direction direction)
55 {
56         unsigned long dampr2;
57         void *vaddr;
58         int i;
59         struct scatterlist *sg;
60
61         BUG_ON(direction == DMA_NONE);
62
63         dampr2 = __get_DAMPR(2);
64
65         for_each_sg(sglist, sg, nents, i) {
66                 vaddr = kmap_atomic_primary(sg_page(sg));
67
68                 frv_dcache_writeback((unsigned long) vaddr,
69                                      (unsigned long) vaddr + PAGE_SIZE);
70
71         }
72
73         kunmap_atomic_primary(vaddr);
74         if (dampr2) {
75                 __set_DAMPR(2, dampr2);
76                 __set_IAMPR(2, dampr2);
77         }
78
79         return nents;
80 }
81
82 EXPORT_SYMBOL(dma_map_sg);
83
84 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
85                         size_t size, enum dma_data_direction direction)
86 {
87         BUG_ON(direction == DMA_NONE);
88         flush_dcache_page(page);
89         return (dma_addr_t) page_to_phys(page) + offset;
90 }
91
92 EXPORT_SYMBOL(dma_map_page);