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 /* Frees table for an individual device node */ 74 extern 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 */ 79 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, 80 int nid); 81 82 extern 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); 86 extern 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 90 extern 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); 93 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, 94 void *vaddr, dma_addr_t dma_handle); 95 extern dma_addr_t iommu_map_single(struct device *dev, struct iommu_table *tbl, 96 void *vaddr, size_t size, unsigned long mask, 97 enum dma_data_direction direction, 98 struct dma_attrs *attrs); 99 extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle, 100 size_t size, enum dma_data_direction direction, 101 struct dma_attrs *attrs); 102 103 extern void iommu_init_early_pSeries(void); 104 extern void iommu_init_early_iSeries(void); 105 extern void iommu_init_early_dart(void); 106 extern void iommu_init_early_pasemi(void); 107 108 #ifdef CONFIG_PCI 109 extern void pci_iommu_init(void); 110 extern void pci_direct_iommu_init(void); 111 #else 112 static inline void pci_iommu_init(void) { } 113 #endif 114 115 extern void alloc_dart_table(void); 116 #if defined(CONFIG_PPC64) && defined(CONFIG_PM) 117 static inline void iommu_save(void) 118 { 119 if (ppc_md.iommu_save) 120 ppc_md.iommu_save(); 121 } 122 123 static inline void iommu_restore(void) 124 { 125 if (ppc_md.iommu_restore) 126 ppc_md.iommu_restore(); 127 } 128 #endif 129 130 #endif /* __KERNEL__ */ 131 #endif /* _ASM_IOMMU_H */ 132