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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
23
Stephen Rothwell426c1a12005-10-14 14:51:42 +100024#include <linux/config.h>
Paul Mackerras9b6b5632005-10-06 12:06:20 +100025#include <asm/types.h>
26#include <linux/spinlock.h>
27#include <linux/device.h>
28#include <linux/dma-mapping.h>
29
30/*
31 * IOMAP_MAX_ORDER defines the largest contiguous block
32 * of dma space we can get. IOMAP_MAX_ORDER = 13
33 * allows up to 2**12 pages (4096 * 4096) = 16 MB
34 */
35#define IOMAP_MAX_ORDER 13
36
37struct iommu_table {
38 unsigned long it_busno; /* Bus number this table belongs to */
39 unsigned long it_size; /* Size of iommu table in entries */
40 unsigned long it_offset; /* Offset into global table */
41 unsigned long it_base; /* mapped address of tce table */
42 unsigned long it_index; /* which iommu table this is */
43 unsigned long it_type; /* type: PCI or Virtual Bus */
44 unsigned long it_blocksize; /* Entries in each block (cacheline) */
45 unsigned long it_hint; /* Hint for next alloc */
46 unsigned long it_largehint; /* Hint for large allocs */
47 unsigned long it_halfpoint; /* Breaking point for small/large allocs */
48 spinlock_t it_lock; /* Protects it_map */
49 unsigned long *it_map; /* A simple allocation bitmap for now */
50};
51
52struct scatterlist;
53struct device_node;
54
55#ifdef CONFIG_PPC_MULTIPLATFORM
56
57/* Walks all buses and creates iommu tables */
58extern void iommu_setup_pSeries(void);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110059extern void iommu_setup_dart(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100060
61/* Frees table for an individual device node */
62extern void iommu_free_table(struct device_node *dn);
63
64#endif /* CONFIG_PPC_MULTIPLATFORM */
65
66#ifdef CONFIG_PPC_PSERIES
67
68/* Creates table for an individual device node */
69extern void iommu_devnode_init_pSeries(struct device_node *dn);
70
71#endif /* CONFIG_PPC_PSERIES */
72
73#ifdef CONFIG_PPC_ISERIES
74
75/* Creates table for an individual device node */
76extern void iommu_devnode_init_iSeries(struct device_node *dn);
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110077/* Get table parameters from HV */
78extern void iommu_table_getparms_iSeries(unsigned long busno,
79 unsigned char slotno,
80 unsigned char virtbus,
81 struct iommu_table* tbl);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100082
83#endif /* CONFIG_PPC_ISERIES */
84
85/* Initializes an iommu_table based in values set in the passed-in
86 * structure
87 */
88extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
89
90extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
91 struct scatterlist *sglist, int nelems,
92 enum dma_data_direction direction);
93extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
94 int nelems, enum dma_data_direction direction);
95
96extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
Paul Mackerras5629d412005-10-12 17:01:50 +100097 dma_addr_t *dma_handle, gfp_t flag);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100098extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
99 void *vaddr, dma_addr_t dma_handle);
100extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
101 size_t size, enum dma_data_direction direction);
102extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
103 size_t size, enum dma_data_direction direction);
104
105extern void iommu_init_early_pSeries(void);
106extern void iommu_init_early_iSeries(void);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100107extern void iommu_init_early_dart(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000108
109#ifdef CONFIG_PCI
110extern void pci_iommu_init(void);
111extern void pci_direct_iommu_init(void);
112#else
113static inline void pci_iommu_init(void) { }
114#endif
115
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100116extern void alloc_dart_table(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000117
118#endif /* _ASM_IOMMU_H */