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