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/compiler.h>
26 #include <linux/spinlock.h>
27 #include <linux/device.h>
28 #include <linux/dma-mapping.h>
29 #include <asm/types.h>
30 #include <asm/bitops.h>
32 #define IOMMU_PAGE_SHIFT 12
33 #define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
34 #define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1))
35 #define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
38 extern int iommu_is_off
;
39 extern int iommu_force_on
;
41 /* Pure 2^n version of get_order */
42 static __inline__ __attribute_const__
int get_iommu_order(unsigned long size
)
44 return __ilog2((size
- 1) >> IOMMU_PAGE_SHIFT
) + 1;
49 * IOMAP_MAX_ORDER defines the largest contiguous block
50 * of dma space we can get. IOMAP_MAX_ORDER = 13
51 * allows up to 2**12 pages (4096 * 4096) = 16 MB
53 #define IOMAP_MAX_ORDER 13
56 unsigned long it_busno
; /* Bus number this table belongs to */
57 unsigned long it_size
; /* Size of iommu table in entries */
58 unsigned long it_offset
; /* Offset into global table */
59 unsigned long it_base
; /* mapped address of tce table */
60 unsigned long it_index
; /* which iommu table this is */
61 unsigned long it_type
; /* type: PCI or Virtual Bus */
62 unsigned long it_blocksize
; /* Entries in each block (cacheline) */
63 unsigned long it_hint
; /* Hint for next alloc */
64 unsigned long it_largehint
; /* Hint for large allocs */
65 unsigned long it_halfpoint
; /* Breaking point for small/large allocs */
66 spinlock_t it_lock
; /* Protects it_map */
67 unsigned long *it_map
; /* A simple allocation bitmap for now */
73 /* Frees table for an individual device node */
74 extern void iommu_free_table(struct device_node
*dn
);
76 /* Initializes an iommu_table based in values set in the passed-in
79 extern struct iommu_table
*iommu_init_table(struct iommu_table
* tbl
,
82 extern int iommu_map_sg(struct iommu_table
*tbl
, struct scatterlist
*sglist
,
83 int nelems
, unsigned long mask
,
84 enum dma_data_direction direction
);
85 extern void iommu_unmap_sg(struct iommu_table
*tbl
, struct scatterlist
*sglist
,
86 int nelems
, enum dma_data_direction direction
);
88 extern void *iommu_alloc_coherent(struct iommu_table
*tbl
, size_t size
,
89 dma_addr_t
*dma_handle
, unsigned long mask
,
90 gfp_t flag
, int node
);
91 extern void iommu_free_coherent(struct iommu_table
*tbl
, size_t size
,
92 void *vaddr
, dma_addr_t dma_handle
);
93 extern dma_addr_t
iommu_map_single(struct iommu_table
*tbl
, void *vaddr
,
94 size_t size
, unsigned long mask
,
95 enum dma_data_direction direction
);
96 extern void iommu_unmap_single(struct iommu_table
*tbl
, dma_addr_t dma_handle
,
97 size_t size
, enum dma_data_direction direction
);
99 extern void iommu_init_early_pSeries(void);
100 extern void iommu_init_early_iSeries(void);
101 extern void iommu_init_early_dart(void);
102 extern void iommu_init_early_pasemi(void);
105 extern void pci_iommu_init(void);
106 extern void pci_direct_iommu_init(void);
108 static inline void pci_iommu_init(void) { }
111 extern void alloc_dart_table(void);
113 #endif /* __KERNEL__ */
114 #endif /* _ASM_IOMMU_H */