2 * arch/sh/mm/consistent.c
4 * Copyright (C) 2004 - 2007 Paul Mundt
6 * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
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/platform_device.h>
14 #include <linux/dma-mapping.h>
15 #include <asm/cacheflush.h>
16 #include <asm/addrspace.h>
19 struct dma_coherent_mem
{
24 unsigned long *bitmap
;
27 void *dma_alloc_coherent(struct device
*dev
, size_t size
,
28 dma_addr_t
*dma_handle
, gfp_t gfp
)
30 void *ret
, *ret_nocache
;
31 int order
= get_order(size
);
33 if (dma_alloc_from_coherent(dev
, size
, dma_handle
, &ret
))
36 ret
= (void *)__get_free_pages(gfp
, order
);
42 * Pages from the page allocator may have data present in
43 * cache. So flush the cache before using uncached memory.
45 dma_cache_sync(dev
, ret
, size
, DMA_BIDIRECTIONAL
);
47 ret_nocache
= ioremap_nocache(virt_to_phys(ret
), size
);
49 free_pages((unsigned long)ret
, order
);
53 *dma_handle
= virt_to_phys(ret
);
56 EXPORT_SYMBOL(dma_alloc_coherent
);
58 void dma_free_coherent(struct device
*dev
, size_t size
,
59 void *vaddr
, dma_addr_t dma_handle
)
61 struct dma_coherent_mem
*mem
= dev
? dev
->dma_mem
: NULL
;
62 int order
= get_order(size
);
64 if (!dma_release_from_coherent(dev
, order
, vaddr
)) {
65 WARN_ON(irqs_disabled()); /* for portability */
66 BUG_ON(mem
&& mem
->flags
& DMA_MEMORY_EXCLUSIVE
);
67 free_pages((unsigned long)phys_to_virt(dma_handle
), order
);
71 EXPORT_SYMBOL(dma_free_coherent
);
73 void dma_cache_sync(struct device
*dev
, void *vaddr
, size_t size
,
74 enum dma_data_direction direction
)
79 void *p1addr
= (void*) P1SEGADDR((unsigned long)vaddr
);
83 case DMA_FROM_DEVICE
: /* invalidate only */
84 __flush_invalidate_region(p1addr
, size
);
86 case DMA_TO_DEVICE
: /* writeback only */
87 __flush_wback_region(p1addr
, size
);
89 case DMA_BIDIRECTIONAL
: /* writeback and invalidate */
90 __flush_purge_region(p1addr
, size
);
96 EXPORT_SYMBOL(dma_cache_sync
);
98 int platform_resource_setup_memory(struct platform_device
*pdev
,
99 char *name
, unsigned long memsize
)
102 dma_addr_t dma_handle
;
105 r
= pdev
->resource
+ pdev
->num_resources
- 1;
107 pr_warning("%s: unable to find empty space for resource\n",
112 buf
= dma_alloc_coherent(NULL
, memsize
, &dma_handle
, GFP_KERNEL
);
114 pr_warning("%s: unable to allocate memory\n", name
);
118 memset(buf
, 0, memsize
);
120 r
->flags
= IORESOURCE_MEM
;
121 r
->start
= dma_handle
;
122 r
->end
= r
->start
+ memsize
- 1;