[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>
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@ -37,6 +37,7 @@
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#define MANUFACTURER_ST 0x0020
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#define MANUFACTURER_TOSHIBA 0x0098
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#define MANUFACTURER_WINBOND 0x00da
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#define CONTINUATION_CODE 0x007f
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/* AMD */
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@ -1760,9 +1761,21 @@ static inline u32 jedec_read_mfr(struct map_info *map, uint32_t base,
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{
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map_word result;
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unsigned long mask;
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u32 ofs = cfi_build_cmd_addr(0, cfi_interleave(cfi), cfi->device_type);
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mask = (1 << (cfi->device_type * 8)) -1;
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result = map_read(map, base + ofs);
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int bank = 0;
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/* According to JEDEC "Standard Manufacturer's Identification Code"
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* (http://www.jedec.org/download/search/jep106W.pdf)
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* several first banks can contain 0x7f instead of actual ID
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*/
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do {
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uint32_t ofs = cfi_build_cmd_addr(0 + (bank << 8),
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cfi_interleave(cfi),
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cfi->device_type);
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mask = (1 << (cfi->device_type * 8)) - 1;
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result = map_read(map, base + ofs);
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bank++;
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} while ((result.x[0] & mask) == CONTINUATION_CODE);
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return result.x[0] & mask;
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}
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