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Paul Mackerras9b6b5632005-10-06 12:06:20 +10001/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3 * Rewrite, cleanup:
Olof Johansson91f14482005-11-21 02:12:32 -06004 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
Paul Mackerras9b6b5632005-10-06 12:06:20 +10005 *
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
Arnd Bergmann88ced032005-12-16 22:43:46 +010023#ifdef __KERNEL__
Paul Mackerras9b6b5632005-10-06 12:06:20 +100024
Stephen Rothwell426c1a12005-10-14 14:51:42 +100025#include <linux/config.h>
Paul Mackerras9b6b5632005-10-06 12:06:20 +100026#include <asm/types.h>
27#include <linux/spinlock.h>
28#include <linux/device.h>
29#include <linux/dma-mapping.h>
30
31/*
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
35 */
36#define IOMAP_MAX_ORDER 13
37
38struct iommu_table {
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 */
51};
52
53struct scatterlist;
54struct device_node;
55
56#ifdef CONFIG_PPC_MULTIPLATFORM
57
58/* Walks all buses and creates iommu tables */
59extern void iommu_setup_pSeries(void);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110060extern void iommu_setup_dart(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100061
62/* Frees table for an individual device node */
63extern void iommu_free_table(struct device_node *dn);
64
65#endif /* CONFIG_PPC_MULTIPLATFORM */
66
Paul Mackerras9b6b5632005-10-06 12:06:20 +100067/* Initializes an iommu_table based in values set in the passed-in
68 * structure
69 */
70extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
71
72extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
Olof Johansson7daa4112006-04-12 21:05:59 -050073 struct scatterlist *sglist, int nelems, unsigned long mask,
Paul Mackerras9b6b5632005-10-06 12:06:20 +100074 enum dma_data_direction direction);
75extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
76 int nelems, enum dma_data_direction direction);
77
78extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
Olof Johansson7daa4112006-04-12 21:05:59 -050079 dma_addr_t *dma_handle, unsigned long mask, gfp_t flag);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100080extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
81 void *vaddr, dma_addr_t dma_handle);
82extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
Olof Johansson7daa4112006-04-12 21:05:59 -050083 size_t size, unsigned long mask,
84 enum dma_data_direction direction);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100085extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
86 size_t size, enum dma_data_direction direction);
87
88extern void iommu_init_early_pSeries(void);
89extern void iommu_init_early_iSeries(void);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110090extern void iommu_init_early_dart(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100091
92#ifdef CONFIG_PCI
93extern void pci_iommu_init(void);
94extern void pci_direct_iommu_init(void);
95#else
96static inline void pci_iommu_init(void) { }
97#endif
98
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110099extern void alloc_dart_table(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000100
Arnd Bergmann88ced032005-12-16 22:43:46 +0100101#endif /* __KERNEL__ */
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000102#endif /* _ASM_IOMMU_H */