LXR linux/arch/powerpc/include/asm/iommu.h

   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_page(struct device *dev, struct iommu_table *tbl,
  96                                 struct page *page, unsigned long offset,
  97                                 size_t size, unsigned long mask,
  98                                 enum dma_data_direction direction,
  99                                 struct dma_attrs *attrs);
 100extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
 101                             size_t size, enum dma_data_direction direction,
 102                             struct dma_attrs *attrs);
 103
 104extern void iommu_init_early_pSeries(void);
 105extern void iommu_init_early_iSeries(void);
 106extern void iommu_init_early_dart(void);
 107extern void iommu_init_early_pasemi(void);
 108
 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
 116extern void alloc_dart_table(void);
 117#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
 118static inline void iommu_save(void)
 119{
 120        if (ppc_md.iommu_save)
 121                ppc_md.iommu_save();
 122}
 123
 124static inline void iommu_restore(void)
 125{
 126        if (ppc_md.iommu_restore)
 127                ppc_md.iommu_restore();
 128}
 129#endif
 130
 131#endif /* __KERNEL__ */
 132#endif /* _ASM_IOMMU_H */
 133