/* * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation * Rewrite, cleanup: * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _ASM_IOMMU_H #define _ASM_IOMMU_H #ifdef __KERNEL__ #include <linux/compiler.h> #include <linux/spinlock.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <asm/machdep.h> #include <asm/types.h> #include <asm/bitops.h> #define IOMMU_PAGE_SHIFT 12 #define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT) #define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1)) #define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE) /* Boot time flags */ extern int iommu_is_off; extern int iommu_force_on; /* Pure 2^n version of get_order */ static __inline__ __attribute_const__ int get_iommu_order(unsigned long size) { return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1; } /* * IOMAP_MAX_ORDER defines the largest contiguous block * of dma space we can get. IOMAP_MAX_ORDER = 13 * allows up to 2**12 pages (4096 * 4096) = 16 MB */ #define IOMAP_MAX_ORDER 13 struct iommu_table { unsigned long it_busno; /* Bus number this table belongs to */ unsigned long it_size; /* Size of iommu table in entries */ unsigned long it_offset; /* Offset into global table */ unsigned long it_base; /* mapped address of tce table */ unsigned long it_index; /* which iommu table this is */ unsigned long it_type; /* type: PCI or Virtual Bus */ unsigned long it_blocksize; /* Entries in each block (cacheline) */ unsigned long it_hint; /* Hint for next alloc */ unsigned long it_largehint; /* Hint for large allocs */ unsigned long it_halfpoint; /* Breaking point for small/large allocs */ spinlock_t it_lock; /* Protects it_map */ unsigned long *it_map; /* A simple allocation bitmap for now */ }; struct scatterlist; struct device_node; /* Frees table for an individual device node */ extern void iommu_free_table(struct device_node *dn); /* Initializes an iommu_table based in values set in the passed-in * structure */ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, int nid); extern int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist, int nelems, unsigned long mask, enum dma_data_direction direction); extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, int nelems, enum dma_data_direction direction); extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size, dma_addr_t *dma_handle, unsigned long mask, gfp_t flag, int node); extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, void *vaddr, dma_addr_t dma_handle); extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr, size_t size, unsigned long mask, enum dma_data_direction direction); extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction); extern void iommu_init_early_pSeries(void); extern void iommu_init_early_iSeries(void); extern void iommu_init_early_dart(void); extern void iommu_init_early_pasemi(void); #ifdef CONFIG_PCI extern void pci_iommu_init(void); extern void pci_direct_iommu_init(void); #else static inline void pci_iommu_init(void) { } #endif extern void alloc_dart_table(void); #if defined(CONFIG_PPC64) && defined(CONFIG_PM) static inline void iommu_save(void) { if (ppc_md.iommu_save) ppc_md.iommu_save(); } static inline void iommu_restore(void) { if (ppc_md.iommu_restore) ppc_md.iommu_restore(); } #endif #endif /* __KERNEL__ */ #endif /* _ASM_IOMMU_H */