2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
4 * Rewrite, cleanup, new allocation schemes:
5 * Copyright (C) 2004 Olof Johansson, IBM Corporation
7 * Dynamic DMA mapping support, platform-independent parts.
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.
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.
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
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/slab.h>
29 #include <linux/spinlock.h>
30 #include <linux/string.h>
31 #include <linux/pci.h>
32 #include <linux/dma-mapping.h>
35 #include <asm/iommu.h>
36 #include <asm/pci-bridge.h>
37 #include <asm/machdep.h>
38 #include <asm/ppc-pci.h>
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.
45 #define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
47 static inline struct iommu_table
*devnode_table(struct device
*dev
)
52 pdev
= ppc64_isabridge_dev
;
56 pdev
= to_pci_dev(dev
);
58 return PCI_DN(PCI_GET_DN(pdev
))->iommu_table
;
62 /* Allocates a contiguous real buffer and creates mappings over it.
63 * Returns the virtual address of the buffer and sets dma_handle
64 * to the dma address (mapping) of the first page.
66 static void *pci_iommu_alloc_coherent(struct device
*hwdev
, size_t size
,
67 dma_addr_t
*dma_handle
, gfp_t flag
)
69 return iommu_alloc_coherent(devnode_table(hwdev
), size
, dma_handle
,
73 static void pci_iommu_free_coherent(struct device
*hwdev
, size_t size
,
74 void *vaddr
, dma_addr_t dma_handle
)
76 iommu_free_coherent(devnode_table(hwdev
), size
, vaddr
, dma_handle
);
79 /* Creates TCEs for a user provided buffer. The user buffer must be
80 * contiguous real kernel storage (not vmalloc). The address of the buffer
81 * passed here is the kernel (virtual) address of the buffer. The buffer
82 * need not be page aligned, the dma_addr_t returned will point to the same
83 * byte within the page as vaddr.
85 static dma_addr_t
pci_iommu_map_single(struct device
*hwdev
, void *vaddr
,
86 size_t size
, enum dma_data_direction direction
)
88 return iommu_map_single(devnode_table(hwdev
), vaddr
, size
, direction
);
92 static void pci_iommu_unmap_single(struct device
*hwdev
, dma_addr_t dma_handle
,
93 size_t size
, enum dma_data_direction direction
)
95 iommu_unmap_single(devnode_table(hwdev
), dma_handle
, size
, direction
);
99 static int pci_iommu_map_sg(struct device
*pdev
, struct scatterlist
*sglist
,
100 int nelems
, enum dma_data_direction direction
)
102 return iommu_map_sg(pdev
, devnode_table(pdev
), sglist
,
106 static void pci_iommu_unmap_sg(struct device
*pdev
, struct scatterlist
*sglist
,
107 int nelems
, enum dma_data_direction direction
)
109 iommu_unmap_sg(devnode_table(pdev
), sglist
, nelems
, direction
);
112 /* We support DMA to/from any memory page via the iommu */
113 static int pci_iommu_dma_supported(struct device
*dev
, u64 mask
)
118 void pci_iommu_init(void)
120 pci_dma_ops
.alloc_coherent
= pci_iommu_alloc_coherent
;
121 pci_dma_ops
.free_coherent
= pci_iommu_free_coherent
;
122 pci_dma_ops
.map_single
= pci_iommu_map_single
;
123 pci_dma_ops
.unmap_single
= pci_iommu_unmap_single
;
124 pci_dma_ops
.map_sg
= pci_iommu_map_sg
;
125 pci_dma_ops
.unmap_sg
= pci_iommu_unmap_sg
;
126 pci_dma_ops
.dma_supported
= pci_iommu_dma_supported
;