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-rw-r--r--arch/powerpc/kernel/pci_iommu.c164
1 files changed, 0 insertions, 164 deletions
diff --git a/arch/powerpc/kernel/pci_iommu.c b/arch/powerpc/kernel/pci_iommu.c
deleted file mode 100644
index 0688b2534acb..000000000000
--- a/arch/powerpc/kernel/pci_iommu.c
+++ /dev/null
@@ -1,164 +0,0 @@
1/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3 *
4 * Rewrite, cleanup, new allocation schemes:
5 * Copyright (C) 2004 Olof Johansson, IBM Corporation
6 *
7 * Dynamic DMA mapping support, platform-independent parts.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24
25#include <linux/init.h>
26#include <linux/types.h>
27#include <linux/slab.h>
28#include <linux/mm.h>
29#include <linux/spinlock.h>
30#include <linux/string.h>
31#include <linux/pci.h>
32#include <linux/dma-mapping.h>
33#include <asm/io.h>
34#include <asm/prom.h>
35#include <asm/iommu.h>
36#include <asm/pci-bridge.h>
37#include <asm/machdep.h>
38#include <asm/ppc-pci.h>
39
40/*
41 * We can use ->sysdata directly and avoid the extra work in
42 * pci_device_to_OF_node since ->sysdata will have been initialised
43 * in the iommu init code for all devices.
44 */
45#define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
46
47static inline struct iommu_table *device_to_table(struct device *hwdev)
48{
49 struct pci_dev *pdev;
50
51 if (!hwdev) {
52 pdev = ppc64_isabridge_dev;
53 if (!pdev)
54 return NULL;
55 } else
56 pdev = to_pci_dev(hwdev);
57
58 return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
59}
60
61
62static inline unsigned long device_to_mask(struct device *hwdev)
63{
64 struct pci_dev *pdev;
65
66 if (!hwdev) {
67 pdev = ppc64_isabridge_dev;
68 if (!pdev) /* This is the best guess we can do */
69 return 0xfffffffful;
70 } else
71 pdev = to_pci_dev(hwdev);
72
73 if (pdev->dma_mask)
74 return pdev->dma_mask;
75
76 /* Assume devices without mask can take 32 bit addresses */
77 return 0xfffffffful;
78}
79
80
81/* Allocates a contiguous real buffer and creates mappings over it.
82 * Returns the virtual address of the buffer and sets dma_handle
83 * to the dma address (mapping) of the first page.
84 */
85static void *pci_iommu_alloc_coherent(struct device *hwdev, size_t size,
86 dma_addr_t *dma_handle, gfp_t flag)
87{
88 return iommu_alloc_coherent(device_to_table(hwdev), size, dma_handle,
89 device_to_mask(hwdev), flag,
90 pcibus_to_node(to_pci_dev(hwdev)->bus));
91}
92
93static void pci_iommu_free_coherent(struct device *hwdev, size_t size,
94 void *vaddr, dma_addr_t dma_handle)
95{
96 iommu_free_coherent(device_to_table(hwdev), size, vaddr, dma_handle);
97}
98
99/* Creates TCEs for a user provided buffer. The user buffer must be
100 * contiguous real kernel storage (not vmalloc). The address of the buffer
101 * passed here is the kernel (virtual) address of the buffer. The buffer
102 * need not be page aligned, the dma_addr_t returned will point to the same
103 * byte within the page as vaddr.
104 */
105static dma_addr_t pci_iommu_map_single(struct device *hwdev, void *vaddr,
106 size_t size, enum dma_data_direction direction)
107{
108 return iommu_map_single(device_to_table(hwdev), vaddr, size,
109 device_to_mask(hwdev), direction);
110}
111
112
113static void pci_iommu_unmap_single(struct device *hwdev, dma_addr_t dma_handle,
114 size_t size, enum dma_data_direction direction)
115{
116 iommu_unmap_single(device_to_table(hwdev), dma_handle, size, direction);
117}
118
119
120static int pci_iommu_map_sg(struct device *pdev, struct scatterlist *sglist,
121 int nelems, enum dma_data_direction direction)
122{
123 return iommu_map_sg(pdev, device_to_table(pdev), sglist,
124 nelems, device_to_mask(pdev), direction);
125}
126
127static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist,
128 int nelems, enum dma_data_direction direction)
129{
130 iommu_unmap_sg(device_to_table(pdev), sglist, nelems, direction);
131}
132
133/* We support DMA to/from any memory page via the iommu */
134static int pci_iommu_dma_supported(struct device *dev, u64 mask)
135{
136 struct iommu_table *tbl = device_to_table(dev);
137
138 if (!tbl || tbl->it_offset > mask) {
139 printk(KERN_INFO "Warning: IOMMU table offset too big for device mask\n");
140 if (tbl)
141 printk(KERN_INFO "mask: 0x%08lx, table offset: 0x%08lx\n",
142 mask, tbl->it_offset);
143 else
144 printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
145 mask);
146 return 0;
147 } else
148 return 1;
149}
150
151struct dma_mapping_ops pci_iommu_ops = {
152 .alloc_coherent = pci_iommu_alloc_coherent,
153 .free_coherent = pci_iommu_free_coherent,
154 .map_single = pci_iommu_map_single,
155 .unmap_single = pci_iommu_unmap_single,
156 .map_sg = pci_iommu_map_sg,
157 .unmap_sg = pci_iommu_unmap_sg,
158 .dma_supported = pci_iommu_dma_supported,
159};
160
161void pci_iommu_init(void)
162{
163 pci_dma_ops = pci_iommu_ops;
164}
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