1
2/* JEDEC Flash Interface.
3 * This is an older type of interface for self programming flash. It is
4 * commonly use in older AMD chips and is obsolete compared with CFI.
5 * It is called JEDEC because the JEDEC association distributes the ID codes
6 * for the chips.
7 *
8 * See the AMD flash databook for information on how to operate the interface.
9 *
10 * $Id: jedec.h,v 1.1.1.1 2008/10/15 03:27:31 james26_jang Exp $
11 */
12
13#ifndef __LINUX_MTD_JEDEC_H__
14#define __LINUX_MTD_JEDEC_H__
15
16#include <linux/types.h>
17#include <linux/mtd/map.h>
18
19#define MAX_JEDEC_CHIPS 16
20
21// Listing of all supported chips and their information
22struct JEDECTable
23{
24   __u16 jedec;
25   char *name;
26   unsigned long size;
27   unsigned long sectorsize;
28   __u32 capabilities;
29};
30
31// JEDEC being 0 is the end of the chip array
32struct jedec_flash_chip
33{
34   __u16 jedec;
35   unsigned long size;
36   unsigned long sectorsize;
37
38   // *(__u8*)(base + (adder << addrshift)) = data << datashift
39   // Address size = size << addrshift
40   unsigned long base;           // Byte 0 of the flash, will be unaligned
41   unsigned int datashift;       // Useful for 32bit/16bit accesses
42   unsigned int addrshift;
43   unsigned long offset;         // linerized start. base==offset for unbanked, uninterleaved flash
44
45   __u32 capabilities;
46
47   // These markers are filled in by the flash_chip_scan function
48   unsigned long start;
49   unsigned long length;
50};
51
52struct jedec_private
53{
54   unsigned long size;         // Total size of all the devices
55
56   /* Bank handling. If sum(bank_fill) == size then this is linear flash.
57      Otherwise the mapping has holes in it. bank_fill may be used to
58      find the holes, but in the common symetric case
59      bank_fill[0] == bank_fill[*], thus addresses may be computed
60      mathmatically. bank_fill must be powers of two */
61   unsigned is_banked;
62   unsigned long bank_fill[MAX_JEDEC_CHIPS];
63
64   struct jedec_flash_chip chips[MAX_JEDEC_CHIPS];
65};
66
67#endif
68