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9b6b563c PM |
1 | /* |
2 | * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation | |
3 | * Rewrite, cleanup: | |
91f14480 | 4 | * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation |
9b6b563c PM |
5 | * |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #ifndef _ASM_IOMMU_H | |
22 | #define _ASM_IOMMU_H | |
88ced031 | 23 | #ifdef __KERNEL__ |
9b6b563c | 24 | |
5d2efba6 | 25 | #include <linux/compiler.h> |
9b6b563c PM |
26 | #include <linux/spinlock.h> |
27 | #include <linux/device.h> | |
28 | #include <linux/dma-mapping.h> | |
5d2efba6 LV |
29 | #include <asm/types.h> |
30 | #include <asm/bitops.h> | |
31 | ||
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) | |
36 | ||
165785e5 JK |
37 | /* Boot time flags */ |
38 | extern int iommu_is_off; | |
39 | extern int iommu_force_on; | |
5d2efba6 LV |
40 | |
41 | /* Pure 2^n version of get_order */ | |
42 | static __inline__ __attribute_const__ int get_iommu_order(unsigned long size) | |
43 | { | |
44 | return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1; | |
45 | } | |
46 | ||
9b6b563c PM |
47 | |
48 | /* | |
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 | |
52 | */ | |
5d2efba6 | 53 | #define IOMAP_MAX_ORDER 13 |
9b6b563c PM |
54 | |
55 | struct iommu_table { | |
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 */ | |
68 | }; | |
69 | ||
70 | struct scatterlist; | |
71 | struct device_node; | |
72 | ||
9b6b563c PM |
73 | /* Frees table for an individual device node */ |
74 | extern void iommu_free_table(struct device_node *dn); | |
75 | ||
9b6b563c PM |
76 | /* Initializes an iommu_table based in values set in the passed-in |
77 | * structure | |
78 | */ | |
ca1588e7 AB |
79 | extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, |
80 | int nid); | |
9b6b563c | 81 | |
12d04eef BH |
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); | |
9b6b563c | 85 | extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, |
12d04eef | 86 | int nelems, enum dma_data_direction direction); |
9b6b563c PM |
87 | |
88 | extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size, | |
12d04eef BH |
89 | dma_addr_t *dma_handle, unsigned long mask, |
90 | gfp_t flag, int node); | |
9b6b563c | 91 | extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, |
12d04eef | 92 | void *vaddr, dma_addr_t dma_handle); |
9b6b563c | 93 | extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr, |
12d04eef BH |
94 | size_t size, unsigned long mask, |
95 | enum dma_data_direction direction); | |
9b6b563c | 96 | extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle, |
12d04eef | 97 | size_t size, enum dma_data_direction direction); |
9b6b563c PM |
98 | |
99 | extern void iommu_init_early_pSeries(void); | |
100 | extern void iommu_init_early_iSeries(void); | |
1beb6a7d | 101 | extern void iommu_init_early_dart(void); |
9b6b563c PM |
102 | |
103 | #ifdef CONFIG_PCI | |
104 | extern void pci_iommu_init(void); | |
105 | extern void pci_direct_iommu_init(void); | |
106 | #else | |
107 | static inline void pci_iommu_init(void) { } | |
108 | #endif | |
109 | ||
1beb6a7d | 110 | extern void alloc_dart_table(void); |
9b6b563c | 111 | |
88ced031 | 112 | #endif /* __KERNEL__ */ |
9b6b563c | 113 | #endif /* _ASM_IOMMU_H */ |