1 /* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/types.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/list.h>
15 #include <linux/pci.h>
16 #include <linux/export.h>
17 #include <linux/highmem.h>
18 #include <linux/scatterlist.h>
21 static void *frv_dma_alloc(struct device
*hwdev
, size_t size
,
22 dma_addr_t
*dma_handle
, gfp_t gfp
, unsigned long attrs
)
26 ret
= consistent_alloc(gfp
, size
, dma_handle
);
33 static void frv_dma_free(struct device
*hwdev
, size_t size
, void *vaddr
,
34 dma_addr_t dma_handle
, unsigned long attrs
)
36 consistent_free(vaddr
);
39 static int frv_dma_map_sg(struct device
*dev
, struct scatterlist
*sglist
,
40 int nents
, enum dma_data_direction direction
,
46 struct scatterlist
*sg
;
48 BUG_ON(direction
== DMA_NONE
);
50 dampr2
= __get_DAMPR(2);
52 for_each_sg(sglist
, sg
, nents
, i
) {
53 vaddr
= kmap_atomic_primary(sg_page(sg
));
55 frv_dcache_writeback((unsigned long) vaddr
,
56 (unsigned long) vaddr
+ PAGE_SIZE
);
60 kunmap_atomic_primary(vaddr
);
62 __set_DAMPR(2, dampr2
);
63 __set_IAMPR(2, dampr2
);
69 static dma_addr_t
frv_dma_map_page(struct device
*dev
, struct page
*page
,
70 unsigned long offset
, size_t size
,
71 enum dma_data_direction direction
, unsigned long attrs
)
73 flush_dcache_page(page
);
74 return (dma_addr_t
) page_to_phys(page
) + offset
;
77 static void frv_dma_sync_single_for_device(struct device
*dev
,
78 dma_addr_t dma_handle
, size_t size
,
79 enum dma_data_direction direction
)
81 flush_write_buffers();
84 static void frv_dma_sync_sg_for_device(struct device
*dev
,
85 struct scatterlist
*sg
, int nelems
,
86 enum dma_data_direction direction
)
88 flush_write_buffers();
92 static int frv_dma_supported(struct device
*dev
, u64 mask
)
95 * we fall back to GFP_DMA when the mask isn't all 1s,
96 * so we can't guarantee allocations that must be
97 * within a tighter range than GFP_DMA..
99 if (mask
< 0x00ffffff)
104 struct dma_map_ops frv_dma_ops
= {
105 .alloc
= frv_dma_alloc
,
106 .free
= frv_dma_free
,
107 .map_page
= frv_dma_map_page
,
108 .map_sg
= frv_dma_map_sg
,
109 .sync_single_for_device
= frv_dma_sync_single_for_device
,
110 .sync_sg_for_device
= frv_dma_sync_sg_for_device
,
111 .dma_supported
= frv_dma_supported
,
113 EXPORT_SYMBOL(frv_dma_ops
);