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1/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3 * Rewrite, cleanup:
4 * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
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
23
24#include <asm/types.h>
25#include <linux/spinlock.h>
26#include <linux/device.h>
27#include <linux/dma-mapping.h>
28
29/*
30 * IOMAP_MAX_ORDER defines the largest contiguous block
31 * of dma space we can get. IOMAP_MAX_ORDER = 13
32 * allows up to 2**12 pages (4096 * 4096) = 16 MB
33 */
34#define IOMAP_MAX_ORDER 13
35
36struct iommu_table {
37 unsigned long it_busno; /* Bus number this table belongs to */
38 unsigned long it_size; /* Size of iommu table in entries */
39 unsigned long it_offset; /* Offset into global table */
40 unsigned long it_base; /* mapped address of tce table */
41 unsigned long it_index; /* which iommu table this is */
42 unsigned long it_type; /* type: PCI or Virtual Bus */
43 unsigned long it_blocksize; /* Entries in each block (cacheline) */
44 unsigned long it_hint; /* Hint for next alloc */
45 unsigned long it_largehint; /* Hint for large allocs */
46 unsigned long it_halfpoint; /* Breaking point for small/large allocs */
47 spinlock_t it_lock; /* Protects it_map */
48 unsigned long *it_map; /* A simple allocation bitmap for now */
49};
50
51struct scatterlist;
52struct device_node;
53
54#ifdef CONFIG_PPC_MULTIPLATFORM
55
56/* Walks all buses and creates iommu tables */
57extern void iommu_setup_pSeries(void);
58extern void iommu_setup_u3(void);
59
60/* Frees table for an individual device node */
61extern void iommu_free_table(struct device_node *dn);
62
63#endif /* CONFIG_PPC_MULTIPLATFORM */
64
65#ifdef CONFIG_PPC_PSERIES
66
67/* Creates table for an individual device node */
68extern void iommu_devnode_init_pSeries(struct device_node *dn);
69
70#endif /* CONFIG_PPC_PSERIES */
71
72#ifdef CONFIG_PPC_ISERIES
73
74/* Creates table for an individual device node */
75extern void iommu_devnode_init_iSeries(struct device_node *dn);
76
77#endif /* CONFIG_PPC_ISERIES */
78
79/* Initializes an iommu_table based in values set in the passed-in
80 * structure
81 */
82extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
83
84extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
85 struct scatterlist *sglist, int nelems,
86 enum dma_data_direction direction);
87extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
88 int nelems, enum dma_data_direction direction);
89
90extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
91 dma_addr_t *dma_handle, unsigned int __nocast flag);
92extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
93 void *vaddr, dma_addr_t dma_handle);
94extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
95 size_t size, enum dma_data_direction direction);
96extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
97 size_t size, enum dma_data_direction direction);
98
99extern void iommu_init_early_pSeries(void);
100extern void iommu_init_early_iSeries(void);
101extern void iommu_init_early_u3(void);
102
103#ifdef CONFIG_PCI
104extern void pci_iommu_init(void);
105extern void pci_direct_iommu_init(void);
106#else
107static inline void pci_iommu_init(void) { }
108#endif
109
110extern void alloc_u3_dart_table(void);
111
112#endif /* _ASM_IOMMU_H */