1 | /* |
2 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> |
3 | * Copyright (C) 2009 Wind River Systems Inc |
4 | * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com |
5 | * |
6 | * Based on DMA code from MIPS. |
7 | * |
8 | * This file is subject to the terms and conditions of the GNU General Public |
9 | * License. See the file "COPYING" in the main directory of this archive |
10 | * for more details. |
11 | */ |
12 | |
13 | #include <linux/types.h> |
14 | #include <linux/mm.h> |
15 | #include <linux/string.h> |
16 | #include <linux/dma-mapping.h> |
17 | #include <linux/io.h> |
18 | #include <linux/cache.h> |
19 | #include <asm/cacheflush.h> |
20 | |
21 | void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, |
22 | enum dma_data_direction dir) |
23 | { |
24 | void *vaddr = phys_to_virt(address: paddr); |
25 | |
26 | switch (dir) { |
27 | case DMA_FROM_DEVICE: |
28 | invalidate_dcache_range((unsigned long)vaddr, |
29 | (unsigned long)(vaddr + size)); |
30 | break; |
31 | case DMA_TO_DEVICE: |
32 | /* |
33 | * We just need to flush the caches here , but Nios2 flush |
34 | * instruction will do both writeback and invalidate. |
35 | */ |
36 | case DMA_BIDIRECTIONAL: /* flush and invalidate */ |
37 | flush_dcache_range((unsigned long)vaddr, |
38 | (unsigned long)(vaddr + size)); |
39 | break; |
40 | default: |
41 | BUG(); |
42 | } |
43 | } |
44 | |
45 | void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, |
46 | enum dma_data_direction dir) |
47 | { |
48 | void *vaddr = phys_to_virt(address: paddr); |
49 | |
50 | switch (dir) { |
51 | case DMA_BIDIRECTIONAL: |
52 | case DMA_FROM_DEVICE: |
53 | invalidate_dcache_range((unsigned long)vaddr, |
54 | (unsigned long)(vaddr + size)); |
55 | break; |
56 | case DMA_TO_DEVICE: |
57 | break; |
58 | default: |
59 | BUG(); |
60 | } |
61 | } |
62 | |
63 | void arch_dma_prep_coherent(struct page *page, size_t size) |
64 | { |
65 | unsigned long start = (unsigned long)page_address(page); |
66 | |
67 | flush_dcache_range(start, start + size); |
68 | } |
69 | |
70 | void *arch_dma_set_uncached(void *ptr, size_t size) |
71 | { |
72 | unsigned long addr = (unsigned long)ptr; |
73 | |
74 | addr |= CONFIG_NIOS2_IO_REGION_BASE; |
75 | |
76 | return (void *)ptr; |
77 | } |
78 | |