---

yaml
---
r: 165461
b: refs/heads/master
c: 6e0cb13
h: refs/heads/master
i:
  165459: e78037c
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 46a8cf2df2232c0051f29716ff8a166ebeb08daf
+refs/heads/master: 6e0cb135b3f3713b95ea41a11155e83a8c70f5f8

trunk/drivers/mtd/nand/nand_base.c

@@ -978,6 +978,54 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	return 0;
 }
 
+/**
+ * nand_read_page_hwecc_oob_first - [REPLACABLE] hw ecc, read oob first
+ * @mtd:	mtd info structure
+ * @chip:	nand chip info structure
+ * @buf:	buffer to store read data
+ *
+ * Hardware ECC for large page chips, require OOB to be read first.
+ * For this ECC mode, the write_page method is re-used from ECC_HW.
+ * These methods read/write ECC from the OOB area, unlike the
+ * ECC_HW_SYNDROME support with multiple ECC steps, follows the
+ * "infix ECC" scheme and reads/writes ECC from the data area, by
+ * overwriting the NAND manufacturer bad block markings.
+ */
+static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
+	struct nand_chip *chip, uint8_t *buf, int page)
+{
+	int i, eccsize = chip->ecc.size;
+	int eccbytes = chip->ecc.bytes;
+	int eccsteps = chip->ecc.steps;
+	uint8_t *p = buf;
+	uint8_t *ecc_code = chip->buffers->ecccode;
+	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	uint8_t *ecc_calc = chip->buffers->ecccalc;
+
+	/* Read the OOB area first */
+	chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+	for (i = 0; i < chip->ecc.total; i++)
+		ecc_code[i] = chip->oob_poi[eccpos[i]];
+
+	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+		int stat;
+
+		chip->ecc.hwctl(mtd, NAND_ECC_READ);
+		chip->read_buf(mtd, p, eccsize);
+		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+
+		stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL);
+		if (stat < 0)
+			mtd->ecc_stats.failed++;
+		else
+			mtd->ecc_stats.corrected += stat;
+	}
+	return 0;
+}
+
 /**
  * nand_read_page_syndrome - [REPLACABLE] hardware ecc syndrom based page read
  * @mtd:	mtd info structure
@@ -2673,6 +2721,17 @@ int nand_scan_tail(struct mtd_info *mtd)
 	 */
 
 	switch (chip->ecc.mode) {
+	case NAND_ECC_HW_OOB_FIRST:
+		/* Similar to NAND_ECC_HW, but a separate read_page handle */
+		if (!chip->ecc.calculate || !chip->ecc.correct ||
+		     !chip->ecc.hwctl) {
+			printk(KERN_WARNING "No ECC functions supplied; "
+			       "Hardware ECC not possible\n");
+			BUG();
+		}
+		if (!chip->ecc.read_page)
+			chip->ecc.read_page = nand_read_page_hwecc_oob_first;
+
 	case NAND_ECC_HW:
 		/* Use standard hwecc read page function ? */
 		if (!chip->ecc.read_page)
@@ -2695,7 +2754,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		     chip->ecc.read_page == nand_read_page_hwecc ||
 		     !chip->ecc.write_page ||
 		     chip->ecc.write_page == nand_write_page_hwecc)) {
-			printk(KERN_WARNING "No ECC functions supplied, "
+			printk(KERN_WARNING "No ECC functions supplied; "
 			       "Hardware ECC not possible\n");
 			BUG();
 		}

trunk/include/linux/mtd/nand.h

@@ -121,6 +121,7 @@ typedef enum {
 	NAND_ECC_SOFT,
 	NAND_ECC_HW,
 	NAND_ECC_HW_SYNDROME,
+	NAND_ECC_HW_OOB_FIRST,
 } nand_ecc_modes_t;
 
 /*