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-rw-r--r--arch/powerpc/include/asm/iommu.h131
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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@lixom.net>, 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#ifdef __KERNEL__
24
25#include <linux/compiler.h>
26#include <linux/spinlock.h>
27#include <linux/device.h>
28#include <linux/dma-mapping.h>
29#include <linux/bitops.h>
30#include <asm/machdep.h>
31#include <asm/types.h>
32
33#define IOMMU_PAGE_SHIFT 12
34#define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
35#define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1))
36#define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
37
38/* Boot time flags */
39extern int iommu_is_off;
40extern int iommu_force_on;
41
42/* Pure 2^n version of get_order */
43static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
44{
45 return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
46}
47
48
49/*
50 * IOMAP_MAX_ORDER defines the largest contiguous block
51 * of dma space we can get. IOMAP_MAX_ORDER = 13
52 * allows up to 2**12 pages (4096 * 4096) = 16 MB
53 */
54#define IOMAP_MAX_ORDER 13
55
56struct iommu_table {
57 unsigned long it_busno; /* Bus number this table belongs to */
58 unsigned long it_size; /* Size of iommu table in entries */
59 unsigned long it_offset; /* Offset into global table */
60 unsigned long it_base; /* mapped address of tce table */
61 unsigned long it_index; /* which iommu table this is */
62 unsigned long it_type; /* type: PCI or Virtual Bus */
63 unsigned long it_blocksize; /* Entries in each block (cacheline) */
64 unsigned long it_hint; /* Hint for next alloc */
65 unsigned long it_largehint; /* Hint for large allocs */
66 unsigned long it_halfpoint; /* Breaking point for small/large allocs */
67 spinlock_t it_lock; /* Protects it_map */
68 unsigned long *it_map; /* A simple allocation bitmap for now */
69};
70
71struct scatterlist;
72
73/* Frees table for an individual device node */
74extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
75
76/* Initializes an iommu_table based in values set in the passed-in
77 * structure
78 */
79extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
80 int nid);
81
82extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
83 struct scatterlist *sglist, int nelems,
84 unsigned long mask, enum dma_data_direction direction,
85 struct dma_attrs *attrs);
86extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
87 int nelems, enum dma_data_direction direction,
88 struct dma_attrs *attrs);
89
90extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
91 size_t size, dma_addr_t *dma_handle,
92 unsigned long mask, gfp_t flag, int node);
93extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
94 void *vaddr, dma_addr_t dma_handle);
95extern dma_addr_t iommu_map_single(struct device *dev, struct iommu_table *tbl,
96 void *vaddr, size_t size, unsigned long mask,
97 enum dma_data_direction direction,
98 struct dma_attrs *attrs);
99extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
100 size_t size, enum dma_data_direction direction,
101 struct dma_attrs *attrs);
102
103extern void iommu_init_early_pSeries(void);
104extern void iommu_init_early_iSeries(void);
105extern void iommu_init_early_dart(void);
106extern void iommu_init_early_pasemi(void);
107
108#ifdef CONFIG_PCI
109extern void pci_iommu_init(void);
110extern void pci_direct_iommu_init(void);
111#else
112static inline void pci_iommu_init(void) { }
113#endif
114
115extern void alloc_dart_table(void);
116#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
117static inline void iommu_save(void)
118{
119 if (ppc_md.iommu_save)
120 ppc_md.iommu_save();
121}
122
123static inline void iommu_restore(void)
124{
125 if (ppc_md.iommu_restore)
126 ppc_md.iommu_restore();
127}
128#endif
129
130#endif /* __KERNEL__ */
131#endif /* _ASM_IOMMU_H */
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