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 <asm/machdep.h>
30#include <asm/types.h>
31#include <asm/bitops.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;
72struct device_node;
73
74/* Frees table for an individual device node */
75extern void iommu_free_table(struct device_node *dn);
76
77/* Initializes an iommu_table based in values set in the passed-in
78 * structure
79 */
80extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
81					    int nid);
82
83extern int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
84			int nelems, unsigned long mask,
85			enum dma_data_direction direction);
86extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
87			   int nelems, enum dma_data_direction direction);
88
89extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
90				  dma_addr_t *dma_handle, unsigned long mask,
91				  gfp_t flag, int node);
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, unsigned long mask,
96				   enum dma_data_direction direction);
97extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
98			       size_t size, enum dma_data_direction direction);
99
100extern void iommu_init_early_pSeries(void);
101extern void iommu_init_early_iSeries(void);
102extern void iommu_init_early_dart(void);
103extern void iommu_init_early_pasemi(void);
104
105#ifdef CONFIG_PCI
106extern void pci_iommu_init(void);
107extern void pci_direct_iommu_init(void);
108#else
109static inline void pci_iommu_init(void) { }
110#endif
111
112extern void alloc_dart_table(void);
113#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
114static inline void iommu_save(void)
115{
116	if (ppc_md.iommu_save)
117		ppc_md.iommu_save();
118}
119
120static inline void iommu_restore(void)
121{
122	if (ppc_md.iommu_restore)
123		ppc_md.iommu_restore();
124}
125#endif
126
127#endif /* __KERNEL__ */
128#endif /* _ASM_IOMMU_H */
129