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Linux/arch/powerpc/include/asm/iommu.h

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  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 */
 39 extern int iommu_is_off;
 40 extern int iommu_force_on;
 41 
 42 /* Pure 2^n version of get_order */
 43 static __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 
 56 struct 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 
 71 struct scatterlist;
 72 
 73 static inline void set_iommu_table_base(struct device *dev, void *base)
 74 {
 75         dev->archdata.dma_data.iommu_table_base = base;
 76 }
 77 
 78 static 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 */
 84 extern 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  */
 89 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
 90                                             int nid);
 91 
 92 extern 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);
 96 extern 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 
100 extern 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);
103 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
104                                 void *vaddr, dma_addr_t dma_handle);
105 extern 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);
110 extern 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 
114 extern void iommu_init_early_pSeries(void);
115 extern void iommu_init_early_dart(void);
116 extern void iommu_init_early_pasemi(void);
117 
118 #ifdef CONFIG_PCI
119 extern void pci_iommu_init(void);
120 extern void pci_direct_iommu_init(void);
121 #else
122 static inline void pci_iommu_init(void) { }
123 #endif
124 
125 extern void alloc_dart_table(void);
126 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
127 static inline void iommu_save(void)
128 {
129         if (ppc_md.iommu_save)
130                 ppc_md.iommu_save();
131 }
132 
133 static 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 */
142 

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