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phoenix |
/*
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* iSeries_dma.h
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* Copyright (C) 2001 Mike Corrigan IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ISERIES_DMA_H
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#define _ISERIES_DMA_H
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#include <asm/types.h>
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#ifndef __LINUX_SPINLOCK_H
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#include <linux/spinlock.h>
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#endif
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// NUM_TCE_LEVELS defines the largest contiguous block
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// of dma (tce) space we can get. NUM_TCE_LEVELS = 10
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// allows up to 2**9 pages (512 * 4096) = 2 MB
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#define NUM_TCE_LEVELS 10
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#define NO_TCE ((dma_addr_t)-1)
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// Tces come in two formats, one for the virtual bus and a different
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// format for PCI
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#define TCE_VB 0
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#define TCE_PCI 1
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union Tce {
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u64 wholeTce;
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struct {
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u64 cacheBits :6; /* Cache hash bits - not used */
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u64 rsvd :6;
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u64 rpn :40; /* Absolute page number */
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u64 valid :1; /* Tce is valid (vb only) */
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u64 allIo :1; /* Tce is valid for all lps (vb only) */
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u64 lpIndex :8; /* LpIndex for user of TCE (vb only) */
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u64 pciWrite :1; /* Write allowed (pci only) */
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u64 readWrite :1; /* Read allowed (pci), Write allowed
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(vb) */
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} tceBits;
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};
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struct Bitmap {
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unsigned long numBits;
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unsigned long numBytes;
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unsigned char * map;
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};
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struct MultiLevelBitmap {
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unsigned long maxLevel;
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struct Bitmap level[NUM_TCE_LEVELS];
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};
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struct TceTable {
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u64 busNumber;
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u64 size;
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u64 startOffset;
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u64 index;
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spinlock_t lock;
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struct MultiLevelBitmap mlbm;
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};
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struct HvTceTableManagerCB {
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u64 busNumber; /* Bus number for this tce table */
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u64 start; /* Will be NULL for secondary */
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u64 totalSize; /* Size (in pages) of whole table */
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u64 startOffset; /* Index into real tce table of the
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start of our section */
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u64 size; /* Size (in pages) of our section */
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u64 index; /* Index of this tce table (token?) */
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u16 maxTceTableIndex; /* Max number of tables for partition */
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u8 virtualBusFlag; /* Flag to indicate virtual bus */
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u8 rsvd[5];
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};
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extern struct TceTable virtBusTceTable; /* Tce table for virtual bus */
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extern struct TceTable * build_tce_table( struct HvTceTableManagerCB *,
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struct TceTable *);
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extern void create_virtual_bus_tce_table( void );
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extern void create_pci_bus_tce_table( unsigned busNumber );
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#endif // _ISERIES_DMA_H
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