xref: /openbmc/linux/include/linux/mtd/ftl.h (revision 3854be77)
1 /*
2  * Derived from (and probably identical to):
3  * ftl.h 1.7 1999/10/25 20:23:17
4  *
5  * The contents of this file are subject to the Mozilla Public License
6  * Version 1.1 (the "License"); you may not use this file except in
7  * compliance with the License. You may obtain a copy of the License
8  * at http://www.mozilla.org/MPL/
9  *
10  * Software distributed under the License is distributed on an "AS IS"
11  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
12  * the License for the specific language governing rights and
13  * limitations under the License.
14  *
15  * The initial developer of the original code is David A. Hinds
16  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
17  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
18  *
19  * Alternatively, the contents of this file may be used under the
20  * terms of the GNU General Public License version 2 (the "GPL"), in
21  * which case the provisions of the GPL are applicable instead of the
22  * above.  If you wish to allow the use of your version of this file
23  * only under the terms of the GPL and not to allow others to use
24  * your version of this file under the MPL, indicate your decision by
25  * deleting the provisions above and replace them with the notice and
26  * other provisions required by the GPL.  If you do not delete the
27  * provisions above, a recipient may use your version of this file
28  * under either the MPL or the GPL.
29  */
30 
31 #ifndef _LINUX_FTL_H
32 #define _LINUX_FTL_H
33 
34 typedef struct erase_unit_header_t {
35     uint8_t	LinkTargetTuple[5];
36     uint8_t	DataOrgTuple[10];
37     uint8_t	NumTransferUnits;
38     uint32_t	EraseCount;
39     uint16_t	LogicalEUN;
40     uint8_t	BlockSize;
41     uint8_t	EraseUnitSize;
42     uint16_t	FirstPhysicalEUN;
43     uint16_t	NumEraseUnits;
44     uint32_t	FormattedSize;
45     uint32_t	FirstVMAddress;
46     uint16_t	NumVMPages;
47     uint8_t	Flags;
48     uint8_t	Code;
49     uint32_t	SerialNumber;
50     uint32_t	AltEUHOffset;
51     uint32_t	BAMOffset;
52     uint8_t	Reserved[12];
53     uint8_t	EndTuple[2];
54 } erase_unit_header_t;
55 
56 /* Flags in erase_unit_header_t */
57 #define HIDDEN_AREA		0x01
58 #define REVERSE_POLARITY	0x02
59 #define DOUBLE_BAI		0x04
60 
61 /* Definitions for block allocation information */
62 
63 #define BLOCK_FREE(b)		((b) == 0xffffffff)
64 #define BLOCK_DELETED(b)	(((b) == 0) || ((b) == 0xfffffffe))
65 
66 #define BLOCK_TYPE(b)		((b) & 0x7f)
67 #define BLOCK_ADDRESS(b)	((b) & ~0x7f)
68 #define BLOCK_NUMBER(b)		((b) >> 9)
69 #define BLOCK_CONTROL		0x30
70 #define BLOCK_DATA		0x40
71 #define BLOCK_REPLACEMENT	0x60
72 #define BLOCK_BAD		0x70
73 
74 #endif /* _LINUX_FTL_H */
75