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
 73static 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
 83/* Frees table for an individual device node */
 84extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
 85
 86/* Initializes an iommu_table based in values set in the passed-in
 87 * structure
 88 */
 89extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
 90					    int nid);
 91
 92extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 93			struct scatterlist *sglist, int nelems,
 94			unsigned long mask, enum dma_data_direction direction,
 95			struct dma_attrs *attrs);
 96extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
 97			   int nelems, enum dma_data_direction direction,
 98			   struct dma_attrs *attrs);
 99
100extern 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);
103extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
104				void *vaddr, dma_addr_t dma_handle);
105extern 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);
113
114extern void iommu_init_early_pSeries(void);
115extern void iommu_init_early_dart(void);
116extern void iommu_init_early_pasemi(void);
117
118#ifdef CONFIG_PCI
119extern void pci_iommu_init(void);
120extern void pci_direct_iommu_init(void);
121#else
122static inline void pci_iommu_init(void) { }
123#endif
124
125extern void alloc_dart_table(void);
126#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
127static inline void iommu_save(void)
128{
129	if (ppc_md.iommu_save)
130		ppc_md.iommu_save();
131}
132
133static inline void iommu_restore(void)
134{
135	if (ppc_md.iommu_restore)
136		ppc_md.iommu_restore();
137}
138#endif
139
140#endif /* __KERNEL__ */
141#endif /* _ASM_IOMMU_H */