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* iommu.h
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
* Rewrite, cleanup:
* Copyright (C) 2004 Olof Johansson <>, 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
* 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
#include <asm/types.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
* IOMAP_MAX_ORDER defines the largest contiguous block
* of dma (tce) space we can get. IOMAP_MAX_ORDER = 13
* allows up to 2**12 pages (4096 * 4096) = 16 MB
#define IOMAP_MAX_ORDER 13
* Tces come in two formats, one for the virtual bus and a different
* format for PCI
#define TCE_VB 0
#define TCE_PCI 1
/* tce_entry
* Used by pSeries (SMP) and iSeries/pSeries LPAR, but there it's
* abstracted so layout is irrelevant.
union tce_entry {
unsigned long te_word;
struct {
unsigned int tb_cacheBits :6; /* Cache hash bits - not used */
unsigned int tb_rsvd :6;
unsigned long tb_rpn :40; /* Real page number */
unsigned int tb_valid :1; /* Tce is valid (vb only) */
unsigned int tb_allio :1; /* Tce is valid for all lps (vb only) */
unsigned int tb_lpindex :8; /* LpIndex for user of TCE (vb only) */
unsigned int tb_pciwr :1; /* Write allowed (pci only) */
unsigned int tb_rdwr :1; /* Read allowed (pci), Write allowed (vb) */
} te_bits;
#define te_cacheBits te_bits.tb_cacheBits
#define te_rpn te_bits.tb_rpn
#define te_valid te_bits.tb_valid
#define te_allio te_bits.tb_allio
#define te_lpindex te_bits.tb_lpindex
#define te_pciwr te_bits.tb_pciwr
#define te_rdwr te_bits.tb_rdwr
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 iommu_table_cb {
unsigned long itc_busno; /* Bus number for this tce table */
unsigned long itc_start; /* Will be NULL for secondary */
unsigned long itc_totalsize; /* Size (in pages) of whole table */
unsigned long itc_offset; /* Index into real tce table of the
start of our section */
unsigned long itc_size; /* Size (in pages) of our section */
unsigned long itc_index; /* Index of this tce table */
unsigned short itc_maxtables; /* Max num of tables for partition */
unsigned char itc_virtbus; /* Flag to indicate virtual bus */
unsigned char itc_slotno; /* IOA Tce Slot Index */
unsigned char itc_rsvd[4];
extern struct iommu_table vio_tce_table; /* Tce table for virtual bus */
struct scatterlist;
/* Walks all buses and creates iommu tables */
extern void iommu_setup_pSeries(void);
extern void iommu_setup_u3(void);
/* Frees table for an individual device node */
extern void iommu_free_table(struct device_node *dn);
/* Creates table for an individual device node */
extern void iommu_devnode_init_pSeries(struct device_node *dn);
/* Walks all buses and creates iommu tables */
extern void iommu_setup_iSeries(void);
/* Initializes tables for bio buses */
extern void __init iommu_vio_init(void);
struct iSeries_Device_Node;
/* Creates table for an individual device node */
extern void iommu_devnode_init_iSeries(struct iSeries_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);
extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
struct scatterlist *sglist, int nelems,
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 int __nocast flag);
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, 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_u3(void);
extern void pci_iommu_init(void);
extern void pci_direct_iommu_init(void);
extern void alloc_u3_dart_table(void);
#endif /* _ASM_IOMMU_H */