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 #define IOMMU_POOL_HASHBITS 2 57 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS) 58 59 struct iommu_pool { 60 unsigned long start; 61 unsigned long end; 62 unsigned long hint; 63 spinlock_t lock; 64 } ____cacheline_aligned_in_smp; 65 66 struct iommu_table { 67 unsigned long it_busno; /* Bus number this table belongs to */ 68 unsigned long it_size; /* Size of iommu table in entries */ 69 unsigned long it_offset; /* Offset into global table */ 70 unsigned long it_base; /* mapped address of tce table */ 71 unsigned long it_index; /* which iommu table this is */ 72 unsigned long it_type; /* type: PCI or Virtual Bus */ 73 unsigned long it_blocksize; /* Entries in each block (cacheline) */ 74 unsigned long poolsize; 75 unsigned long nr_pools; 76 struct iommu_pool large_pool; 77 struct iommu_pool pools[IOMMU_NR_POOLS]; 78 unsigned long *it_map; /* A simple allocation bitmap for now */ 79 }; 80 81 struct scatterlist; 82 83 static inline void set_iommu_table_base(struct device *dev, void *base) 84 { 85 dev->archdata.dma_data.iommu_table_base = base; 86 } 87 88 static inline void *get_iommu_table_base(struct device *dev) 89 { 90 return dev->archdata.dma_data.iommu_table_base; 91 } 92 93 /* Frees table for an individual device node */ 94 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name); 95 96 /* Initializes an iommu_table based in values set in the passed-in 97 * structure 98 */ 99 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, 100 int nid); 101 102 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl, 103 struct scatterlist *sglist, int nelems, 104 unsigned long mask, enum dma_data_direction direction, 105 struct dma_attrs *attrs); 106 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, 107 int nelems, enum dma_data_direction direction, 108 struct dma_attrs *attrs); 109 110 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, 111 size_t size, dma_addr_t *dma_handle, 112 unsigned long mask, gfp_t flag, int node); 113 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, 114 void *vaddr, dma_addr_t dma_handle); 115 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, 116 struct page *page, unsigned long offset, 117 size_t size, unsigned long mask, 118 enum dma_data_direction direction, 119 struct dma_attrs *attrs); 120 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle, 121 size_t size, enum dma_data_direction direction, 122 struct dma_attrs *attrs); 123 124 extern void iommu_init_early_pSeries(void); 125 extern void iommu_init_early_dart(void); 126 extern void iommu_init_early_pasemi(void); 127 128 #ifdef CONFIG_PCI 129 extern void pci_iommu_init(void); 130 extern void pci_direct_iommu_init(void); 131 #else 132 static inline void pci_iommu_init(void) { } 133 #endif 134 135 extern void alloc_dart_table(void); 136 #if defined(CONFIG_PPC64) && defined(CONFIG_PM) 137 static inline void iommu_save(void) 138 { 139 if (ppc_md.iommu_save) 140 ppc_md.iommu_save(); 141 } 142 143 static inline void iommu_restore(void) 144 { 145 if (ppc_md.iommu_restore) 146 ppc_md.iommu_restore(); 147 } 148 #endif 149 150 #endif /* __KERNEL__ */ 151 #endif /* _ASM_IOMMU_H */ 152