include/linux/mtd/jedec.h

   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   4  * commonly use in older AMD chips and is obsolete compared with CFI.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 1.4 2005/11/07 11:14:54 gleixner Exp $
  11  */
  12
  13 #ifndef __LINUX_MTD_JEDEC_H__
  14 #define __LINUX_MTD_JEDEC_H__
  15
  16 #include <linux/types.h>
  17
  18 #define MAX_JEDEC_CHIPS 16
  19
  20 // Listing of all supported chips and their information
  21 struct JEDECTable
  22 {
  23    __u16 jedec;
  24    char *name;
  25    unsigned long size;
  26    unsigned long sectorsize;
  27    __u32 capabilities;
  28 };
  29
  30 // JEDEC being 0 is the end of the chip array
  31 struct jedec_flash_chip
  32 {
  33    __u16 jedec;
  34    unsigned long size;
  35    unsigned long sectorsize;
  36
  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
  43
  44    __u32 capabilities;
  45
  46    // These markers are filled in by the flash_chip_scan function
  47    unsigned long start;
  48    unsigned long length;
  49 };
  50
  51 struct jedec_private
  52 {
  53    unsigned long size;         // Total size of all the devices
  54
  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 */
  60    unsigned is_banked;
  61    unsigned long bank_fill[MAX_JEDEC_CHIPS];
  62
  63    struct jedec_flash_chip chips[MAX_JEDEC_CHIPS];
  64 };
  65
  66 #endif