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4 * commonly use in older AMD chips and is obsolete compared with CFI.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
8 * See the AMD flash databook for information on how to operate the interface.
10 * $Id: jedec.h,v 1.3 2003/05/21 11:51:01 dwmw2 Exp $
13 #ifndef __LINUX_MTD_JEDEC_H__
14 #define __LINUX_MTD_JEDEC_H__
16 #include <linux/types.h>
18 #define MAX_JEDEC_CHIPS 16
20 // Listing of all supported chips and their information
26 unsigned long sectorsize;
30 // JEDEC being 0 is the end of the chip array
31 struct jedec_flash_chip
35 unsigned long sectorsize;
37 // *(__u8*)(base + (adder << addrshift)) = data << datashift
38 // Address size = size << addrshift
39 unsigned long base; // Byte 0 of the flash, will be unaligned
40 unsigned int datashift; // Useful for 32bit/16bit accesses
41 unsigned int addrshift;
42 unsigned long offset; // linerized start. base==offset for unbanked, uninterleaved flash
46 // These markers are filled in by the flash_chip_scan function
53 unsigned long size; // Total size of all the devices
55 /* Bank handling. If sum(bank_fill) == size then this is linear flash.
56 Otherwise the mapping has holes in it. bank_fill may be used to
57 find the holes, but in the common symetric case
58 bank_fill[0] == bank_fill[*], thus addresses may be computed
59 mathmatically. bank_fill must be powers of two */
61 unsigned long bank_fill[MAX_JEDEC_CHIPS];
63 struct jedec_flash_chip chips[MAX_JEDEC_CHIPS];