[PATCH 4/5 fix] mtd: nand: parse out the JEDEC compliant nand
Huang Shijie
b32955 at freescale.com
Fri Dec 27 04:51:10 EST 2013
This patch adds the parsing code for the JEDEC compliant nand.
Signed-off-by: Huang Shijie <b32955 at freescale.com>
---
Add version check.
---
drivers/mtd/nand/nand_base.c | 93 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 93 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index db45ab3..077eae1 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3038,6 +3038,95 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
}
/*
+ * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.
+ */
+static int nand_flash_detect_jedec(struct mtd_info *mtd, struct nand_chip *chip,
+ int *busw)
+{
+ struct nand_jedec_params *p = &chip->jedec_params;
+ struct jedec_ecc_info *ecc;
+ int val;
+ int i;
+
+ /* Try JEDEC for unknown chip or LP */
+ chip->cmdfunc(mtd, NAND_CMD_READID, 0x40, -1);
+ if (chip->read_byte(mtd) != 'J' || chip->read_byte(mtd) != 'E' ||
+ chip->read_byte(mtd) != 'D' || chip->read_byte(mtd) != 'E' ||
+ chip->read_byte(mtd) != 'C')
+ return 0;
+
+ /*
+ * JEDEC must be probed in 8-bit mode or with NAND_BUSWIDTH_AUTO, not
+ * with NAND_BUSWIDTH_16
+ */
+ if (chip->options & NAND_BUSWIDTH_16) {
+ pr_err("JEDEC cannot be probed in 16-bit mode; aborting\n");
+ return 0;
+ }
+
+ chip->cmdfunc(mtd, NAND_CMD_PARAM, 0x40, -1);
+ for (i = 0; i < 3; i++) {
+ chip->read_buf(mtd, (uint8_t *)p, sizeof(*p));
+ if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) ==
+ le16_to_cpu(p->crc))
+ break;
+ }
+
+ if (i == 3) {
+ pr_err("Could not find valid JEDEC parameter page; aborting\n");
+ return 0;
+ }
+
+ /* Check version */
+ val = le16_to_cpu(p->revision);
+ if (val & (1 << 2))
+ chip->jedec_version = 10;
+ else if (val & (1 << 1))
+ chip->jedec_version = 1; /* vendor specific version */
+
+ if (!chip->jedec_version) {
+ pr_info("unsupported JEDEC version: %d\n", val);
+ return 0;
+ }
+
+ sanitize_string(p->manufacturer, sizeof(p->manufacturer));
+ sanitize_string(p->model, sizeof(p->model));
+ if (!mtd->name)
+ mtd->name = p->model;
+
+ mtd->writesize = le32_to_cpu(p->byte_per_page);
+
+ /* Please reference to the comment for nand_flash_detect_onfi. */
+ mtd->erasesize = 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
+ mtd->erasesize *= mtd->writesize;
+
+ mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
+
+ /* Please reference to the comment for nand_flash_detect_onfi. */
+ chip->chipsize = 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
+ chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
+ chip->bits_per_cell = p->bits_per_cell;
+
+ if (jedec_feature(chip) & JEDEC_FEATURE_16_BIT_BUS)
+ *busw = NAND_BUSWIDTH_16;
+ else
+ *busw = 0;
+
+ /* ECC info */
+ ecc = p->ecc_info;
+
+ if (ecc->codeword_size) {
+ chip->ecc_strength_ds = ecc->ecc_bits;
+ chip->ecc_step_ds = 1 << ecc->codeword_size;
+ } else {
+ pr_debug("Invalid codeword size\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
* nand_id_has_period - Check if an ID string has a given wraparound period
* @id_data: the ID string
* @arrlen: the length of the @id_data array
@@ -3450,6 +3539,10 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
/* Check is chip is ONFI compliant */
if (nand_flash_detect_onfi(mtd, chip, &busw))
goto ident_done;
+
+ /* Check if the chip is JEDEC compliant */
+ if (nand_flash_detect_jedec(mtd, chip, &busw))
+ goto ident_done;
}
if (!type->name)
--
1.7.2.rc3
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