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79f8511c GR |
1 | /* |
2 | * Copyright (C) 2003-2013 Broadcom Corporation | |
3 | * All Rights Reserved | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the Broadcom | |
9 | * license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in | |
19 | * the documentation and/or other materials provided with the | |
20 | * distribution. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR | |
23 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
24 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE | |
31 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN | |
32 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | */ | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/scatterlist.h> | |
36 | #include <linux/bootmem.h> | |
37 | #include <linux/export.h> | |
38 | #include <linux/swiotlb.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/mm.h> | |
42 | ||
43 | #include <asm/bootinfo.h> | |
44 | ||
45 | static char *nlm_swiotlb; | |
46 | ||
47 | static void *nlm_dma_alloc_coherent(struct device *dev, size_t size, | |
00085f1e | 48 | dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) |
79f8511c | 49 | { |
79f8511c GR |
50 | /* ignore region specifiers */ |
51 | gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); | |
52 | ||
53 | #ifdef CONFIG_ZONE_DMA32 | |
54 | if (dev->coherent_dma_mask <= DMA_BIT_MASK(32)) | |
55 | gfp |= __GFP_DMA32; | |
56 | #endif | |
57 | ||
58 | /* Don't invoke OOM killer */ | |
59 | gfp |= __GFP_NORETRY; | |
60 | ||
61 | return swiotlb_alloc_coherent(dev, size, dma_handle, gfp); | |
62 | } | |
63 | ||
64 | static void nlm_dma_free_coherent(struct device *dev, size_t size, | |
00085f1e | 65 | void *vaddr, dma_addr_t dma_handle, unsigned long attrs) |
79f8511c | 66 | { |
79f8511c GR |
67 | swiotlb_free_coherent(dev, size, vaddr, dma_handle); |
68 | } | |
69 | ||
70 | struct dma_map_ops nlm_swiotlb_dma_ops = { | |
71 | .alloc = nlm_dma_alloc_coherent, | |
72 | .free = nlm_dma_free_coherent, | |
73 | .map_page = swiotlb_map_page, | |
74 | .unmap_page = swiotlb_unmap_page, | |
75 | .map_sg = swiotlb_map_sg_attrs, | |
76 | .unmap_sg = swiotlb_unmap_sg_attrs, | |
77 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, | |
78 | .sync_single_for_device = swiotlb_sync_single_for_device, | |
79 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | |
80 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | |
81 | .mapping_error = swiotlb_dma_mapping_error, | |
82 | .dma_supported = swiotlb_dma_supported | |
83 | }; | |
84 | ||
85 | void __init plat_swiotlb_setup(void) | |
86 | { | |
87 | size_t swiotlbsize; | |
88 | unsigned long swiotlb_nslabs; | |
89 | ||
90 | swiotlbsize = 1 << 20; /* 1 MB for now */ | |
91 | swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT; | |
92 | swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE); | |
93 | swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT; | |
94 | ||
95 | nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize); | |
96 | swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1); | |
97 | } |