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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
Linas Vepstas5d2efba2006-10-30 16:15:59 +110025#include <linux/compiler.h>
Paul Mackerras9b6b5632005-10-06 12:06:20 +100026#include <linux/spinlock.h>
27#include <linux/device.h>
28#include <linux/dma-mapping.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070029#include <linux/bitops.h>
Johannes Berg7e115802007-05-03 22:28:32 +100030#include <asm/machdep.h>
Linas Vepstas5d2efba2006-10-30 16:15:59 +110031#include <asm/types.h>
Linas Vepstas5d2efba2006-10-30 16:15:59 +110032
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
Jeremy Kerr165785e2006-11-11 17:25:18 +110038/* Boot time flags */
39extern int iommu_is_off;
40extern int iommu_force_on;
Linas Vepstas5d2efba2006-10-30 16:15:59 +110041
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
Paul Mackerras9b6b5632005-10-06 12:06:20 +100048
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 */
Linas Vepstas5d2efba2006-10-30 16:15:59 +110054#define IOMAP_MAX_ORDER 13
Paul Mackerras9b6b5632005-10-06 12:06:20 +100055
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;
Paul Mackerras9b6b5632005-10-06 12:06:20 +100072
Becky Bruce738ef422009-09-21 08:26:35 +000073static inline void set_iommu_table_base(struct device *dev, void *base)
74{
75 dev->archdata.dma_data.iommu_table_base = base;
76}
77
78static inline void *get_iommu_table_base(struct device *dev)
79{
80 return dev->archdata.dma_data.iommu_table_base;
81}
82
Paul Mackerras9b6b5632005-10-06 12:06:20 +100083/* Frees table for an individual device node */
Stephen Rothwell68d315f2007-12-06 13:39:19 +110084extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100085
Paul Mackerras9b6b5632005-10-06 12:06:20 +100086/* Initializes an iommu_table based in values set in the passed-in
87 * structure
88 */
Anton Blanchardca1588e2006-06-10 20:58:08 +100089extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
90 int nid);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100091
Mark Nelsonc8692362008-07-05 05:05:41 +100092extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
93 struct scatterlist *sglist, int nelems,
Mark Nelson3affedc2008-07-05 05:05:42 +100094 unsigned long mask, enum dma_data_direction direction,
95 struct dma_attrs *attrs);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100096extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
Mark Nelson3affedc2008-07-05 05:05:42 +100097 int nelems, enum dma_data_direction direction,
98 struct dma_attrs *attrs);
Paul Mackerras9b6b5632005-10-06 12:06:20 +100099
FUJITA Tomonorifb3475e2008-02-04 22:28:08 -0800100extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
101 size_t size, dma_addr_t *dma_handle,
102 unsigned long mask, gfp_t flag, int node);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000103extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +1100104 void *vaddr, dma_addr_t dma_handle);
Mark Nelsonf9226d52008-10-27 20:38:08 +0000105extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
106 struct page *page, unsigned long offset,
107 size_t size, unsigned long mask,
108 enum dma_data_direction direction,
109 struct dma_attrs *attrs);
110extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
111 size_t size, enum dma_data_direction direction,
112 struct dma_attrs *attrs);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000113
114extern void iommu_init_early_pSeries(void);
115extern void iommu_init_early_iSeries(void);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100116extern void iommu_init_early_dart(void);
Olof Johansson31c56d82007-02-04 16:36:55 -0600117extern void iommu_init_early_pasemi(void);
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000118
119#ifdef CONFIG_PCI
120extern void pci_iommu_init(void);
121extern void pci_direct_iommu_init(void);
122#else
123static inline void pci_iommu_init(void) { }
124#endif
125
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100126extern void alloc_dart_table(void);
Johannes Berg7e115802007-05-03 22:28:32 +1000127#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
128static inline void iommu_save(void)
129{
130 if (ppc_md.iommu_save)
131 ppc_md.iommu_save();
132}
133
134static inline void iommu_restore(void)
135{
136 if (ppc_md.iommu_restore)
137 ppc_md.iommu_restore();
138}
139#endif
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000140
Arnd Bergmann88ced032005-12-16 22:43:46 +0100141#endif /* __KERNEL__ */
Paul Mackerras9b6b5632005-10-06 12:06:20 +1000142#endif /* _ASM_IOMMU_H */