[MTD] OneNAND: Handle DDP chip boundary during read-while-load
The read-while-load method of reading from OneNAND needs to allow for the change of bufferRAM address at the boundary between the two chips in a double density (DDP) device. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
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@ -710,7 +710,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
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struct mtd_ecc_stats stats;
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int read = 0, column;
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int thislen;
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int ret = 0;
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int ret = 0, boundary = 0;
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DEBUG(MTD_DEBUG_LEVEL3, "onenand_read: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
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@ -749,6 +749,17 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
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from += thislen;
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if (read + thislen < len) {
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this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
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/*
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* Chip boundary handling in DDP
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* Now we issued chip 1 read and pointed chip 1
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* bufferam so we have to point chip 0 bufferam.
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*/
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if (this->device_id & ONENAND_DEVICE_IS_DDP &&
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unlikely(from == (this->chipsize >> 1))) {
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this->write_word(0, this->base + ONENAND_REG_START_ADDRESS2);
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boundary = 1;
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} else
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boundary = 0;
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ONENAND_SET_PREV_BUFFERRAM(this);
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}
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/* While load is going, read from last bufferRAM */
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@ -758,6 +769,8 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
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if (read == len)
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break;
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/* Set up for next read from bufferRAM */
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if (unlikely(boundary))
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this->write_word(0x8000, this->base + ONENAND_REG_START_ADDRESS2);
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ONENAND_SET_NEXT_BUFFERRAM(this);
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buf += thislen;
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thislen = min_t(int, mtd->writesize, len - read);
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