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| 4 | * commonly use in older AMD chips and is obsolete compared with CFI.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