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[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>
This commit is contained in:
Mike Rapoport 2008-05-27 11:20:03 +03:00 committed by David Woodhouse
parent 8fd310a1cc
commit 5c9c11e1c4
1 changed files with 16 additions and 3 deletions
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19
drivers/mtd/chips/jedec_probe.c
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@ -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;
}