Commit | Line | Data |
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5a0015d6 | 1 | /* |
f30c2269 | 2 | * arch/xtensa/kernel/pci-dma.c |
5a0015d6 CZ |
3 | * |
4 | * DMA coherent memory allocation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * Copyright (C) 2002 - 2005 Tensilica Inc. | |
12 | * | |
13 | * Based on version for i386. | |
14 | * | |
15 | * Chris Zankel <chris@zankel.net> | |
16 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> | |
17 | */ | |
18 | ||
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/pci.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/cacheflush.h> | |
25 | ||
26 | /* | |
27 | * Note: We assume that the full memory space is always mapped to 'kseg' | |
28 | * Otherwise we have to use page attributes (not implemented). | |
29 | */ | |
30 | ||
31 | void * | |
5fb5cbed | 32 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp) |
5a0015d6 CZ |
33 | { |
34 | void *ret; | |
35 | ||
36 | /* ignore region speicifiers */ | |
37 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); | |
38 | ||
39 | if (dev == NULL || (*dev->dma_mask < 0xffffffff)) | |
40 | gfp |= GFP_DMA; | |
41 | ret = (void *)__get_free_pages(gfp, get_order(size)); | |
42 | ||
43 | if (ret != NULL) { | |
44 | memset(ret, 0, size); | |
45 | *handle = virt_to_bus(ret); | |
46 | } | |
47 | return (void*) BYPASS_ADDR((unsigned long)ret); | |
48 | } | |
49 | ||
50 | void dma_free_coherent(struct device *hwdev, size_t size, | |
51 | void *vaddr, dma_addr_t dma_handle) | |
52 | { | |
53 | free_pages(CACHED_ADDR((unsigned long)vaddr), get_order(size)); | |
54 | } | |
55 | ||
56 | ||
57 | void consistent_sync(void *vaddr, size_t size, int direction) | |
58 | { | |
59 | switch (direction) { | |
60 | case PCI_DMA_NONE: | |
61 | BUG(); | |
62 | case PCI_DMA_FROMDEVICE: /* invalidate only */ | |
63 | __invalidate_dcache_range((unsigned long)vaddr, | |
64 | (unsigned long)size); | |
65 | break; | |
66 | ||
67 | case PCI_DMA_TODEVICE: /* writeback only */ | |
68 | case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */ | |
69 | __flush_invalidate_dcache_range((unsigned long)vaddr, | |
70 | (unsigned long)size); | |
71 | break; | |
72 | } | |
73 | } |