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67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/* JEDEC Flash Interface.
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* This is an older type of interface for self programming flash. It is
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* commonly use in older AMD chips and is obsolete compared with CFI.
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* It is called JEDEC because the JEDEC association distributes the ID codes
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* for the chips.
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*
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* See the AMD flash databook for information on how to operate the interface.
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*
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* $Id: jedec.h,v 1.3 2003/05/21 11:51:01 dwmw2 Exp $
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*/
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#ifndef __LINUX_MTD_JEDEC_H__
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#define __LINUX_MTD_JEDEC_H__
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#include <linux/types.h>
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#define MAX_JEDEC_CHIPS 16
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// Listing of all supported chips and their information
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struct JEDECTable
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{
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__u16 jedec;
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char *name;
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unsigned long size;
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unsigned long sectorsize;
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__u32 capabilities;
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};
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// JEDEC being 0 is the end of the chip array
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struct jedec_flash_chip
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{
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__u16 jedec;
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unsigned long size;
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unsigned long sectorsize;
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// *(__u8*)(base + (adder << addrshift)) = data << datashift
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// Address size = size << addrshift
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unsigned long base; // Byte 0 of the flash, will be unaligned
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unsigned int datashift; // Useful for 32bit/16bit accesses
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unsigned int addrshift;
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unsigned long offset; // linerized start. base==offset for unbanked, uninterleaved flash
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__u32 capabilities;
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// These markers are filled in by the flash_chip_scan function
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unsigned long start;
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unsigned long length;
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};
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struct jedec_private
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{
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unsigned long size; // Total size of all the devices
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/* Bank handling. If sum(bank_fill) == size then this is linear flash.
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Otherwise the mapping has holes in it. bank_fill may be used to
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find the holes, but in the common symetric case
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bank_fill[0] == bank_fill[*], thus addresses may be computed
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mathmatically. bank_fill must be powers of two */
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unsigned is_banked;
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unsigned long bank_fill[MAX_JEDEC_CHIPS];
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struct jedec_flash_chip chips[MAX_JEDEC_CHIPS];
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};
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#endif
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