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/config.h>
  26 #include <asm/types.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/device.h>
  29 #include <linux/dma-mapping.h>
  30
  31 /*
  32  * IOMAP_MAX_ORDER defines the largest contiguous block
  33  * of dma space we can get.  IOMAP_MAX_ORDER = 13
  34  * allows up to 2**12 pages (4096 * 4096) = 16 MB
  35  */
  36 #define IOMAP_MAX_ORDER 13
  37
  38 struct iommu_table {
  39         unsigned long  it_busno;     /* Bus number this table belongs to */
  40         unsigned long  it_size;      /* Size of iommu table in entries */
  41         unsigned long  it_offset;    /* Offset into global table */
  42         unsigned long  it_base;      /* mapped address of tce table */
  43         unsigned long  it_index;     /* which iommu table this is */
  44         unsigned long  it_type;      /* type: PCI or Virtual Bus */
  45         unsigned long  it_blocksize; /* Entries in each block (cacheline) */
  46         unsigned long  it_hint;      /* Hint for next alloc */
  47         unsigned long  it_largehint; /* Hint for large allocs */
  48         unsigned long  it_halfpoint; /* Breaking point for small/large allocs */
  49         spinlock_t     it_lock;      /* Protects it_map */
  50         unsigned long *it_map;       /* A simple allocation bitmap for now */
  51 };
  52
  53 struct scatterlist;
  54 struct device_node;
  55
  56 #ifdef CONFIG_PPC_MULTIPLATFORM
  57
  58 /* Walks all buses and creates iommu tables */
  59 extern void iommu_setup_pSeries(void);
  60 extern void iommu_setup_dart(void);
  61
  62 /* Frees table for an individual device node */
  63 extern void iommu_free_table(struct device_node *dn);
  64
  65 #endif /* CONFIG_PPC_MULTIPLATFORM */
  66
  67 /* Initializes an iommu_table based in values set in the passed-in
  68  * structure
  69  */
  70 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
  71
  72 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
  73                 struct scatterlist *sglist, int nelems,
  74                 enum dma_data_direction direction);
  75 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
  76                 int nelems, enum dma_data_direction direction);
  77
  78 extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
  79                 dma_addr_t *dma_handle, gfp_t flag);
  80 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
  81                 void *vaddr, dma_addr_t dma_handle);
  82 extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
  83                 size_t size, enum dma_data_direction direction);
  84 extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
  85                 size_t size, enum dma_data_direction direction);
  86
  87 extern void iommu_init_early_pSeries(void);
  88 extern void iommu_init_early_iSeries(void);
  89 extern void iommu_init_early_dart(void);
  90
  91 #ifdef CONFIG_PCI
  92 extern void pci_iommu_init(void);
  93 extern void pci_direct_iommu_init(void);
  94 #else
  95 static inline void pci_iommu_init(void) { }
  96 #endif
  97
  98 extern void alloc_dart_table(void);
  99
 100 #endif /* __KERNEL__ */
 101 #endif /* _ASM_IOMMU_H */