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
6 * Based on DMA code from MIPS.
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
13 #include <linux/types.h>
15 #include <linux/string.h>
16 #include <linux/dma-mapping.h>
18 #include <linux/cache.h>
19 #include <asm/cacheflush.h>
21 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
22 size_t size, enum dma_data_direction dir)
24 void *vaddr = phys_to_virt(paddr);
28 invalidate_dcache_range((unsigned long)vaddr,
29 (unsigned long)(vaddr + size));
33 * We just need to flush the caches here , but Nios2 flush
34 * instruction will do both writeback and invalidate.
36 case DMA_BIDIRECTIONAL: /* flush and invalidate */
37 flush_dcache_range((unsigned long)vaddr,
38 (unsigned long)(vaddr + size));
45 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
46 size_t size, enum dma_data_direction dir)
48 void *vaddr = phys_to_virt(paddr);
51 case DMA_BIDIRECTIONAL:
53 invalidate_dcache_range((unsigned long)vaddr,
54 (unsigned long)(vaddr + size));
63 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
64 gfp_t gfp, unsigned long attrs)
68 /* optimized page clearing */
71 if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
74 ret = (void *) __get_free_pages(gfp, get_order(size));
76 *dma_handle = virt_to_phys(ret);
77 flush_dcache_range((unsigned long) ret,
78 (unsigned long) ret + size);
79 ret = UNCAC_ADDR(ret);
85 void arch_dma_free(struct device *dev, size_t size, void *vaddr,
86 dma_addr_t dma_handle, unsigned long attrs)
88 unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
90 free_pages(addr, get_order(size));