eeepc-laptop: Register as a pci-hotplug device
[linux-2.6/linux-acpi-2.6.git] / arch / sparc / kernel / dma.c
blob524c32f97c555856809f3d9400d9fd76080aaa38
1 /* dma.c: PCI and SBUS DMA accessors for 32-bit sparc.
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/scatterlist.h>
10 #include <linux/mm.h>
12 #ifdef CONFIG_PCI
13 #include <linux/pci.h>
14 #endif
16 #include "dma.h"
18 int dma_supported(struct device *dev, u64 mask)
20 #ifdef CONFIG_PCI
21 if (dev->bus == &pci_bus_type)
22 return pci_dma_supported(to_pci_dev(dev), mask);
23 #endif
24 return 0;
26 EXPORT_SYMBOL(dma_supported);
28 int dma_set_mask(struct device *dev, u64 dma_mask)
30 #ifdef CONFIG_PCI
31 if (dev->bus == &pci_bus_type)
32 return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
33 #endif
34 return -EOPNOTSUPP;
36 EXPORT_SYMBOL(dma_set_mask);
38 static void *dma32_alloc_coherent(struct device *dev, size_t size,
39 dma_addr_t *dma_handle, gfp_t flag)
41 #ifdef CONFIG_PCI
42 if (dev->bus == &pci_bus_type)
43 return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
44 #endif
45 return sbus_alloc_consistent(dev, size, dma_handle);
48 static void dma32_free_coherent(struct device *dev, size_t size,
49 void *cpu_addr, dma_addr_t dma_handle)
51 #ifdef CONFIG_PCI
52 if (dev->bus == &pci_bus_type) {
53 pci_free_consistent(to_pci_dev(dev), size,
54 cpu_addr, dma_handle);
55 return;
57 #endif
58 sbus_free_consistent(dev, size, cpu_addr, dma_handle);
61 static dma_addr_t dma32_map_page(struct device *dev, struct page *page,
62 unsigned long offset, size_t size,
63 enum dma_data_direction direction)
65 #ifdef CONFIG_PCI
66 if (dev->bus == &pci_bus_type)
67 return pci_map_page(to_pci_dev(dev), page, offset,
68 size, (int)direction);
69 #endif
70 return sbus_map_single(dev, page_address(page) + offset,
71 size, (int)direction);
74 static void dma32_unmap_page(struct device *dev, dma_addr_t dma_address,
75 size_t size, enum dma_data_direction direction)
77 #ifdef CONFIG_PCI
78 if (dev->bus == &pci_bus_type) {
79 pci_unmap_page(to_pci_dev(dev), dma_address,
80 size, (int)direction);
81 return;
83 #endif
84 sbus_unmap_single(dev, dma_address, size, (int)direction);
87 static int dma32_map_sg(struct device *dev, struct scatterlist *sg,
88 int nents, enum dma_data_direction direction)
90 #ifdef CONFIG_PCI
91 if (dev->bus == &pci_bus_type)
92 return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
93 #endif
94 return sbus_map_sg(dev, sg, nents, direction);
97 void dma32_unmap_sg(struct device *dev, struct scatterlist *sg,
98 int nents, enum dma_data_direction direction)
100 #ifdef CONFIG_PCI
101 if (dev->bus == &pci_bus_type) {
102 pci_unmap_sg(to_pci_dev(dev), sg, nents, (int)direction);
103 return;
105 #endif
106 sbus_unmap_sg(dev, sg, nents, (int)direction);
109 static void dma32_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
110 size_t size,
111 enum dma_data_direction direction)
113 #ifdef CONFIG_PCI
114 if (dev->bus == &pci_bus_type) {
115 pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
116 size, (int)direction);
117 return;
119 #endif
120 sbus_dma_sync_single_for_cpu(dev, dma_handle, size, (int) direction);
123 static void dma32_sync_single_for_device(struct device *dev,
124 dma_addr_t dma_handle, size_t size,
125 enum dma_data_direction direction)
127 #ifdef CONFIG_PCI
128 if (dev->bus == &pci_bus_type) {
129 pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
130 size, (int)direction);
131 return;
133 #endif
134 sbus_dma_sync_single_for_device(dev, dma_handle, size, (int) direction);
137 static void dma32_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
138 int nelems, enum dma_data_direction direction)
140 #ifdef CONFIG_PCI
141 if (dev->bus == &pci_bus_type) {
142 pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg,
143 nelems, (int)direction);
144 return;
146 #endif
147 BUG();
150 static void dma32_sync_sg_for_device(struct device *dev,
151 struct scatterlist *sg, int nelems,
152 enum dma_data_direction direction)
154 #ifdef CONFIG_PCI
155 if (dev->bus == &pci_bus_type) {
156 pci_dma_sync_sg_for_device(to_pci_dev(dev), sg,
157 nelems, (int)direction);
158 return;
160 #endif
161 BUG();
164 static const struct dma_ops dma32_dma_ops = {
165 .alloc_coherent = dma32_alloc_coherent,
166 .free_coherent = dma32_free_coherent,
167 .map_page = dma32_map_page,
168 .unmap_page = dma32_unmap_page,
169 .map_sg = dma32_map_sg,
170 .unmap_sg = dma32_unmap_sg,
171 .sync_single_for_cpu = dma32_sync_single_for_cpu,
172 .sync_single_for_device = dma32_sync_single_for_device,
173 .sync_sg_for_cpu = dma32_sync_sg_for_cpu,
174 .sync_sg_for_device = dma32_sync_sg_for_device,
177 const struct dma_ops *dma_ops = &dma32_dma_ops;
178 EXPORT_SYMBOL(dma_ops);