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 */ 39extern int iommu_is_off; 40extern int iommu_force_on; 41 42/* Pure 2^n version of get_order */ 43static __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 56struct 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 71struct scatterlist; 72 73static inline void set_iommu_table_base(struct device *dev, void *base) 74{ 75 dev->archdata.dma_data.iommu_table_base = base; 76} 77 78static 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 */ 84extern 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 */ 89extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, 90 int nid); 91 92extern 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); 96extern 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 100extern 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); 103extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, 104 void *vaddr, dma_addr_t dma_handle); 105extern 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); 110extern 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 114extern void iommu_init_early_pSeries(void); 115extern void iommu_init_early_iSeries(void); 116extern void iommu_init_early_dart(void); 117extern void iommu_init_early_pasemi(void); 118 119#ifdef CONFIG_PCI 120extern void pci_iommu_init(void); 121extern void pci_direct_iommu_init(void); 122#else 123static inline void pci_iommu_init(void) { } 124#endif 125 126extern void alloc_dart_table(void); 127#if defined(CONFIG_PPC64) && defined(CONFIG_PM) 128static inline void iommu_save(void) 129{ 130 if (ppc_md.iommu_save) 131 ppc_md.iommu_save(); 132} 133 134static inline void iommu_restore(void) 135{ 136 if (ppc_md.iommu_restore) 137 ppc_md.iommu_restore(); 138} 139#endif 140 141#endif /* __KERNEL__ */ 142#endif /* _ASM_IOMMU_H */ 143