1/*
2 * pci_dma.h
3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18 */
19
20#ifndef _PCI_DMA_H
21#define _PCI_DMA_H
22
23#include <asm/types.h>
24#include <linux/spinlock.h>
25
26/*
27 * NUM_TCE_LEVELS defines the largest contiguous block
28 * of dma (tce) space we can get.  NUM_TCE_LEVELS = 10
29 * allows up to 2**9 pages (512 * 4096) = 2 MB
30 */
31#define NUM_TCE_LEVELS 10
32
33#define NO_TCE ((dma_addr_t)-1)
34
35/*
36 * Tces come in two formats, one for the virtual bus and a different
37 * format for PCI
38 */
39#define TCE_VB  0
40#define TCE_PCI 1
41
42union Tce {
43   	u64 wholeTce;
44	struct {
45		u64 cacheBits	:6;	/* Cache hash bits - not used */
46		u64 rsvd	:6;
47		u64 rpn		:40;	/* Absolute page number */
48		u64 valid	:1;	/* Tce is valid (vb only) */
49		u64 allIo	:1;	/* Tce is valid for all lps (vb only) */
50		u64 lpIndex	:8;	/* LpIndex for user of TCE (vb only) */
51		u64 pciWrite	:1;	/* Write allowed (pci only) */
52		u64 readWrite	:1;	/* Read allowed (pci), Write allowed (vb) */
53	} tceBits;
54};
55
56struct Bitmap {
57	unsigned long	numBits;
58	unsigned long	numBytes;
59	unsigned char * map;
60};
61
62struct MultiLevelBitmap {
63	unsigned long 	maxLevel;
64	struct Bitmap 	level[NUM_TCE_LEVELS];
65};
66
67struct TceTable {
68	u64	busNumber;
69	u64	size;
70	u64	startOffset;
71	u64     base;                   /* pSeries native only */
72	u64	index;
73	u64	tceType;
74	spinlock_t lock;
75	struct MultiLevelBitmap mlbm;
76};
77
78struct TceTableManagerCB {
79	u64	busNumber;		/* Bus number for this tce table */
80	u64	start;			/* Will be NULL for secondary */
81	u64	totalSize;		/* Size (in pages) of whole table */
82	u64	startOffset;		/* Index into real tce table of the
83					   start of our section */
84	u64	size;			/* Size (in pages) of our section */
85	u64	index;			/* Index of this tce table (token?) */
86	u16	maxTceTableIndex;	/* Max num of tables for partition */
87	u8	virtualBusFlag;		/* Flag to indicate virtual bus */
88 	u8	logicalSlot;		/* IOA Tce Slot Index */
89 	u8	rsvd[4];
90};
91
92extern struct TceTable virtBusTceTable;	/* Tce table for virtual bus */
93
94extern void create_tce_tables(void);
95extern void create_pci_bus_tce_table(unsigned long);
96
97void tce_init_pSeries(void);
98void tce_init_iSeries(void);
99
100#endif
101