diff options
| author | Mike Rapoport <mike@compulab.co.il> | 2008-05-27 11:20:03 +0300 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2008-06-04 17:22:59 +0100 |
| commit | 5c9c11e1c47c2101253a95c54ef72e13edcc728a (patch) | |
| tree | b1af123309e5827d174fe3cea0efae106550ffc3 /drivers/mtd/chips/jedec_probe.c | |
| parent | 8fd310a1cc3aadb7a17d844beeefae66b1a169c6 (diff) | |
[MTD] [NOR] Add support for flash chips with ID in bank other than 0
According to JEDEC "Standard Manufacturer's Identification Code"
(http://www.jedec.org/download/search/jep106W.pdf)
several first banks of NOR flash can contain 0x7f instead of actual ID.
This patch adds support for reading manufacturer ID from banks other than 0.
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/chips/jedec_probe.c')
| -rw-r--r-- | drivers/mtd/chips/jedec_probe.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/mtd/chips/jedec_probe.c b/drivers/mtd/chips/jedec_probe.c index b717f1a5d6b..279fe60b785 100644 --- a/drivers/mtd/chips/jedec_probe.c +++ b/drivers/mtd/chips/jedec_probe.c @@ -37,6 +37,7 @@ #define MANUFACTURER_ST 0x0020 #define MANUFACTURER_TOSHIBA 0x0098 #define MANUFACTURER_WINBOND 0x00da +#define CONTINUATION_CODE 0x007f /* AMD */ @@ -1760,9 +1761,21 @@ static inline u32 jedec_read_mfr(struct map_info *map, uint32_t base, { map_word result; unsigned long mask; - u32 ofs = cfi_build_cmd_addr(0, cfi_interleave(cfi), cfi->device_type); - mask = (1 << (cfi->device_type * 8)) -1; - result = map_read(map, base + ofs); + int bank = 0; + + /* According to JEDEC "Standard Manufacturer's Identification Code" + * (http://www.jedec.org/download/search/jep106W.pdf) + * several first banks can contain 0x7f instead of actual ID + */ + do { + uint32_t ofs = cfi_build_cmd_addr(0 + (bank << 8), + cfi_interleave(cfi), + cfi->device_type); + mask = (1 << (cfi->device_type * 8)) - 1; + result = map_read(map, base + ofs); + bank++; + } while ((result.x[0] & mask) == CONTINUATION_CODE); + return result.x[0] & mask; } |