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tce.h
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1 /*
2  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3  * Rewrite, cleanup:
4  * Copyright (C) 2004 Olof Johansson <[email protected]>, 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_POWERPC_TCE_H
22 #define _ASM_POWERPC_TCE_H
23 #ifdef __KERNEL__
24 
25 #include <asm/iommu.h>
26 
27 /*
28  * Tces come in two formats, one for the virtual bus and a different
29  * format for PCI. PCI TCEs can have hardware or software maintianed
30  * coherency.
31  */
32 #define TCE_VB 0
33 #define TCE_PCI 1
34 #define TCE_PCI_SWINV_CREATE 2
35 #define TCE_PCI_SWINV_FREE 4
36 #define TCE_PCI_SWINV_PAIR 8
37 
38 /* TCE page size is 4096 bytes (1 << 12) */
39 
40 #define TCE_SHIFT 12
41 #define TCE_PAGE_SIZE (1 << TCE_SHIFT)
42 
43 #define TCE_ENTRY_SIZE 8 /* each TCE is 64 bits */
44 
45 #define TCE_RPN_MASK 0xfffffffffful /* 40-bit RPN (4K pages) */
46 #define TCE_RPN_SHIFT 12
47 #define TCE_VALID 0x800 /* TCE valid */
48 #define TCE_ALLIO 0x400 /* TCE valid for all lpars */
49 #define TCE_PCI_WRITE 0x2 /* write from PCI allowed */
50 #define TCE_PCI_READ 0x1 /* read from PCI allowed */
51 #define TCE_VB_WRITE 0x1 /* write from VB allowed */
52 
53 #endif /* __KERNEL__ */
54 #endif /* _ASM_POWERPC_TCE_H */