2 * arch/ppc64/kernel/pci_iommu.c
3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
5 * Rewrite, cleanup, new allocation schemes:
6 * Copyright (C) 2004 Olof Johansson, IBM Corporation
8 * Dynamic DMA mapping support, platform-independent parts.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/config.h>
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/string.h>
33 #include <linux/pci.h>
34 #include <linux/dma-mapping.h>
37 #include <asm/iommu.h>
38 #include <asm/pci-bridge.h>
39 #include <asm/machdep.h>
40 #include <asm/ppc-pci.h>
42 #ifdef CONFIG_PPC_ISERIES
43 #include <asm/iSeries/iSeries_pci.h>
44 #endif /* CONFIG_PPC_ISERIES */
47 * We can use ->sysdata directly and avoid the extra work in
48 * pci_device_to_OF_node since ->sysdata will have been initialised
49 * in the iommu init code for all devices.
51 #define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
53 static inline struct iommu_table *devnode_table(struct device *dev)
58 pdev = ppc64_isabridge_dev;
62 pdev = to_pci_dev(dev);
64 #ifdef CONFIG_PPC_ISERIES
65 return ISERIES_DEVNODE(pdev)->iommu_table;
66 #endif /* CONFIG_PPC_ISERIES */
68 #ifdef CONFIG_PPC_MULTIPLATFORM
69 return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
70 #endif /* CONFIG_PPC_MULTIPLATFORM */
74 /* Allocates a contiguous real buffer and creates mappings over it.
75 * Returns the virtual address of the buffer and sets dma_handle
76 * to the dma address (mapping) of the first page.
78 static void *pci_iommu_alloc_coherent(struct device *hwdev, size_t size,
79 dma_addr_t *dma_handle, unsigned int __nocast flag)
81 return iommu_alloc_coherent(devnode_table(hwdev), size, dma_handle,
85 static void pci_iommu_free_coherent(struct device *hwdev, size_t size,
86 void *vaddr, dma_addr_t dma_handle)
88 iommu_free_coherent(devnode_table(hwdev), size, vaddr, dma_handle);
91 /* Creates TCEs for a user provided buffer. The user buffer must be
92 * contiguous real kernel storage (not vmalloc). The address of the buffer
93 * passed here is the kernel (virtual) address of the buffer. The buffer
94 * need not be page aligned, the dma_addr_t returned will point to the same
95 * byte within the page as vaddr.
97 static dma_addr_t pci_iommu_map_single(struct device *hwdev, void *vaddr,
98 size_t size, enum dma_data_direction direction)
100 return iommu_map_single(devnode_table(hwdev), vaddr, size, direction);
104 static void pci_iommu_unmap_single(struct device *hwdev, dma_addr_t dma_handle,
105 size_t size, enum dma_data_direction direction)
107 iommu_unmap_single(devnode_table(hwdev), dma_handle, size, direction);
111 static int pci_iommu_map_sg(struct device *pdev, struct scatterlist *sglist,
112 int nelems, enum dma_data_direction direction)
114 return iommu_map_sg(pdev, devnode_table(pdev), sglist,
118 static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist,
119 int nelems, enum dma_data_direction direction)
121 iommu_unmap_sg(devnode_table(pdev), sglist, nelems, direction);
124 /* We support DMA to/from any memory page via the iommu */
125 static int pci_iommu_dma_supported(struct device *dev, u64 mask)
130 void pci_iommu_init(void)
132 pci_dma_ops.alloc_coherent = pci_iommu_alloc_coherent;
133 pci_dma_ops.free_coherent = pci_iommu_free_coherent;
134 pci_dma_ops.map_single = pci_iommu_map_single;
135 pci_dma_ops.unmap_single = pci_iommu_unmap_single;
136 pci_dma_ops.map_sg = pci_iommu_map_sg;
137 pci_dma_ops.unmap_sg = pci_iommu_unmap_sg;
138 pci_dma_ops.dma_supported = pci_iommu_dma_supported;