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authorBecky Bruce <becky.bruce@freescale.com>2008-09-08 05:09:53 -0400
committerKumar Gala <galak@kernel.crashing.org>2008-09-24 17:26:42 -0400
commit8dd0e95206f7c33bed2aed33ac668335174684e8 (patch)
treefc338d97889c873bc6cf241da8469763f9d05629 /arch/powerpc/kernel/dma-iommu.c
parent7c05d7e08d907d66b8e18515572f42c71fb709fe (diff)
powerpc: Move iommu dma ops from dma.c to dma-iommu.c
32-bit platforms are about to start using dma.c; move the iommu dma ops into their own file to make this a bit cleaner. Signed-off-by: Becky Bruce <becky.bruce@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/dma-iommu.c')
-rw-r--r--arch/powerpc/kernel/dma-iommu.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
new file mode 100644
index 000000000000..01091f1d508c
--- /dev/null
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -0,0 +1,103 @@
1/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
3 *
4 * Provide default implementations of the DMA mapping callbacks for
5 * busses using the iommu infrastructure
6 */
7
8#include <asm/iommu.h>
9
10/*
11 * Generic iommu implementation
12 */
13
14/* Allocates a contiguous real buffer and creates mappings over it.
15 * Returns the virtual address of the buffer and sets dma_handle
16 * to the dma address (mapping) of the first page.
17 */
18static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
19 dma_addr_t *dma_handle, gfp_t flag)
20{
21 return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
22 dma_handle, device_to_mask(dev), flag,
23 dev->archdata.numa_node);
24}
25
26static void dma_iommu_free_coherent(struct device *dev, size_t size,
27 void *vaddr, dma_addr_t dma_handle)
28{
29 iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle);
30}
31
32/* Creates TCEs for a user provided buffer. The user buffer must be
33 * contiguous real kernel storage (not vmalloc). The address of the buffer
34 * passed here is the kernel (virtual) address of the buffer. The buffer
35 * need not be page aligned, the dma_addr_t returned will point to the same
36 * byte within the page as vaddr.
37 */
38static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr,
39 size_t size,
40 enum dma_data_direction direction,
41 struct dma_attrs *attrs)
42{
43 return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
44 device_to_mask(dev), direction, attrs);
45}
46
47
48static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
49 size_t size,
50 enum dma_data_direction direction,
51 struct dma_attrs *attrs)
52{
53 iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction,
54 attrs);
55}
56
57
58static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
59 int nelems, enum dma_data_direction direction,
60 struct dma_attrs *attrs)
61{
62 return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
63 device_to_mask(dev), direction, attrs);
64}
65
66static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
67 int nelems, enum dma_data_direction direction,
68 struct dma_attrs *attrs)
69{
70 iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
71 attrs);
72}
73
74/* We support DMA to/from any memory page via the iommu */
75static int dma_iommu_dma_supported(struct device *dev, u64 mask)
76{
77 struct iommu_table *tbl = dev->archdata.dma_data;
78
79 if (!tbl || tbl->it_offset > mask) {
80 printk(KERN_INFO
81 "Warning: IOMMU offset too big for device mask\n");
82 if (tbl)
83 printk(KERN_INFO
84 "mask: 0x%08lx, table offset: 0x%08lx\n",
85 mask, tbl->it_offset);
86 else
87 printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
88 mask);
89 return 0;
90 } else
91 return 1;
92}
93
94struct dma_mapping_ops dma_iommu_ops = {
95 .alloc_coherent = dma_iommu_alloc_coherent,
96 .free_coherent = dma_iommu_free_coherent,
97 .map_single = dma_iommu_map_single,
98 .unmap_single = dma_iommu_unmap_single,
99 .map_sg = dma_iommu_map_sg,
100 .unmap_sg = dma_iommu_unmap_sg,
101 .dma_supported = dma_iommu_dma_supported,
102};
103EXPORT_SYMBOL(dma_iommu_ops);