2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
4 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/config.h>
26 #include <asm/types.h>
27 #include <linux/spinlock.h>
28 #include <linux/device.h>
29 #include <linux/dma-mapping.h>
32 * IOMAP_MAX_ORDER defines the largest contiguous block
33 * of dma space we can get. IOMAP_MAX_ORDER = 13
34 * allows up to 2**12 pages (4096 * 4096) = 16 MB
36 #define IOMAP_MAX_ORDER 13
39 unsigned long it_busno; /* Bus number this table belongs to */
40 unsigned long it_size; /* Size of iommu table in entries */
41 unsigned long it_offset; /* Offset into global table */
42 unsigned long it_base; /* mapped address of tce table */
43 unsigned long it_index; /* which iommu table this is */
44 unsigned long it_type; /* type: PCI or Virtual Bus */
45 unsigned long it_blocksize; /* Entries in each block (cacheline) */
46 unsigned long it_hint; /* Hint for next alloc */
47 unsigned long it_largehint; /* Hint for large allocs */
48 unsigned long it_halfpoint; /* Breaking point for small/large allocs */
49 spinlock_t it_lock; /* Protects it_map */
50 unsigned long *it_map; /* A simple allocation bitmap for now */
56 #ifdef CONFIG_PPC_MULTIPLATFORM
58 /* Walks all buses and creates iommu tables */
59 extern void iommu_setup_pSeries(void);
60 extern void iommu_setup_dart(void);
62 /* Frees table for an individual device node */
63 extern void iommu_free_table(struct device_node *dn);
65 #endif /* CONFIG_PPC_MULTIPLATFORM */
67 /* Initializes an iommu_table based in values set in the passed-in
70 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
72 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
73 struct scatterlist *sglist, int nelems,
74 enum dma_data_direction direction);
75 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
76 int nelems, enum dma_data_direction direction);
78 extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
79 dma_addr_t *dma_handle, gfp_t flag);
80 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
81 void *vaddr, dma_addr_t dma_handle);
82 extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
83 size_t size, enum dma_data_direction direction);
84 extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
85 size_t size, enum dma_data_direction direction);
87 extern void iommu_init_early_pSeries(void);
88 extern void iommu_init_early_iSeries(void);
89 extern void iommu_init_early_dart(void);
92 extern void pci_iommu_init(void);
93 extern void pci_direct_iommu_init(void);
95 static inline void pci_iommu_init(void) { }
98 extern void alloc_dart_table(void);
100 #endif /* __KERNEL__ */
101 #endif /* _ASM_IOMMU_H */