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/* JEDEC Flash Interface.
* This is an older type of interface for self programming flash. It is
* commonly use in older AMD chips and is obsolete compared with CFI.
* It is called JEDEC because the JEDEC association distributes the ID codes
* for the chips.
*
* See the AMD flash databook for information on how to operate the interface.
*
* $Id: jedec.h,v 1.2 2001/11/06 14:37:36 dwmw2 Exp $
*/
#ifndef __LINUX_MTD_JEDEC_H__
#define __LINUX_MTD_JEDEC_H__
#include <linux/types.h>
#include <linux/mtd/map.h>
#define MAX_JEDEC_CHIPS 16
// Listing of all supported chips and their information
struct JEDECTable
{
__u16 jedec;
char *name;
unsigned long size;
unsigned long sectorsize;
__u32 capabilities;
};
// JEDEC being 0 is the end of the chip array
struct jedec_flash_chip
{
__u16 jedec;
unsigned long size;
unsigned long sectorsize;
// *(__u8*)(base + (adder << addrshift)) = data << datashift
// Address size = size << addrshift
unsigned long base; // Byte 0 of the flash, will be unaligned
unsigned int datashift; // Useful for 32bit/16bit accesses
unsigned int addrshift;
unsigned long offset; // linerized start. base==offset for unbanked, uninterleaved flash
__u32 capabilities;
// These markers are filled in by the flash_chip_scan function
unsigned long start;
unsigned long length;
};
struct jedec_private
{
unsigned long size; // Total size of all the devices
/* Bank handling. If sum(bank_fill) == size then this is linear flash.
Otherwise the mapping has holes in it. bank_fill may be used to
find the holes, but in the common symetric case
bank_fill[0] == bank_fill[*], thus addresses may be computed
mathmatically. bank_fill must be powers of two */
unsigned is_banked;
unsigned long bank_fill[MAX_JEDEC_CHIPS];
struct jedec_flash_chip chips[MAX_JEDEC_CHIPS];
};
#endif
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