mtd: nand: hynix: Rework NAND ID decoding to extract more information
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Wed May 10 19:59:05 PDT 2017
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=78f3482d74809f278614470fb68536db16152ec8
Commit: 78f3482d74809f278614470fb68536db16152ec8
Parent: 8fc82d456e40a073d7e85d7825a345698f4b5a40
Author: Boris Brezillon <boris.brezillon at free-electrons.com>
AuthorDate: Fri May 27 14:36:36 2016 +0200
Committer: Boris Brezillon <boris.brezillon at free-electrons.com>
CommitDate: Wed Mar 8 23:21:24 2017 +0100
mtd: nand: hynix: Rework NAND ID decoding to extract more information
The current NAND ID detection in nand_hynix.c is not handling the
different scheme used by Hynix, thus forcing developers to add new
entry to the nand_ids table each time they want to support a new MLC
NAND.
Enhance the detection logic to handle all known formats. This does not
necessarily mean we are handling all the cases, but if new formats are
discovered, the code should evolve to take them into account instead of
adding more full-id entries to the nand_ids table.
Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
Acked-by: Richard Weinberger <richard at nod.at>
---
drivers/mtd/nand/nand_hynix.c | 228 ++++++++++++++++++++++++++++++++++++++----
1 file changed, 209 insertions(+), 19 deletions(-)
diff --git a/drivers/mtd/nand/nand_hynix.c b/drivers/mtd/nand/nand_hynix.c
index fbd6616..57c4ed8 100644
--- a/drivers/mtd/nand/nand_hynix.c
+++ b/drivers/mtd/nand/nand_hynix.c
@@ -16,21 +16,56 @@
*/
#include <linux/mtd/nand.h>
+#include <linux/sizes.h>
-static void hynix_nand_decode_id(struct nand_chip *chip)
+static bool hynix_nand_has_valid_jedecid(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
+ u8 jedecid[6] = { };
+ int i = 0;
+
+ chip->cmdfunc(mtd, NAND_CMD_READID, 0x40, -1);
+ for (i = 0; i < 5; i++)
+ jedecid[i] = chip->read_byte(mtd);
- /* Hynix MLC (6 byte ID): Hynix H27UBG8T2B (p.22) */
- if (chip->id.len == 6 && !nand_is_slc(chip)) {
- u8 tmp, extid = chip->id.data[3];
+ return !strcmp("JEDEC", jedecid);
+}
- /* Extract pagesize */
- mtd->writesize = 2048 << (extid & 0x03);
- extid >>= 2;
+static void hynix_nand_extract_oobsize(struct nand_chip *chip,
+ bool valid_jedecid)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ u8 oobsize;
- /* Extract oobsize */
- switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
+ oobsize = ((chip->id.data[3] >> 2) & 0x3) |
+ ((chip->id.data[3] >> 4) & 0x4);
+
+ if (valid_jedecid) {
+ switch (oobsize) {
+ case 0:
+ mtd->oobsize = 2048;
+ break;
+ case 1:
+ mtd->oobsize = 1664;
+ break;
+ case 2:
+ mtd->oobsize = 1024;
+ break;
+ case 3:
+ mtd->oobsize = 640;
+ break;
+ default:
+ /*
+ * We should never reach this case, but if that
+ * happens, this probably means Hynix decided to use
+ * a different extended ID format, and we should find
+ * a way to support it.
+ */
+ WARN(1, "Invalid OOB size");
+ break;
+ }
+ } else {
+ switch (oobsize) {
case 0:
mtd->oobsize = 128;
break;
@@ -49,23 +84,178 @@ static void hynix_nand_decode_id(struct nand_chip *chip)
case 5:
mtd->oobsize = 16;
break;
- default:
+ case 6:
mtd->oobsize = 640;
break;
+ default:
+ /*
+ * We should never reach this case, but if that
+ * happens, this probably means Hynix decided to use
+ * a different extended ID format, and we should find
+ * a way to support it.
+ */
+ WARN(1, "Invalid OOB size");
+ break;
}
+ }
+}
+
+static void hynix_nand_extract_ecc_requirements(struct nand_chip *chip,
+ bool valid_jedecid)
+{
+ u8 ecc_level = (chip->id.data[4] >> 4) & 0x7;
+
+ if (valid_jedecid) {
+ /* Reference: H27UCG8T2E datasheet */
+ chip->ecc_step_ds = 1024;
- /* Extract blocksize */
- extid >>= 2;
- tmp = ((extid >> 1) & 0x04) | (extid & 0x03);
- if (tmp < 0x03)
- mtd->erasesize = (128 * 1024) << tmp;
- else if (tmp == 0x03)
- mtd->erasesize = 768 * 1024;
- else
- mtd->erasesize = (64 * 1024) << tmp;
+ switch (ecc_level) {
+ case 0:
+ chip->ecc_step_ds = 0;
+ chip->ecc_strength_ds = 0;
+ break;
+ case 1:
+ chip->ecc_strength_ds = 4;
+ break;
+ case 2:
+ chip->ecc_strength_ds = 24;
+ break;
+ case 3:
+ chip->ecc_strength_ds = 32;
+ break;
+ case 4:
+ chip->ecc_strength_ds = 40;
+ break;
+ case 5:
+ chip->ecc_strength_ds = 50;
+ break;
+ case 6:
+ chip->ecc_strength_ds = 60;
+ break;
+ default:
+ /*
+ * We should never reach this case, but if that
+ * happens, this probably means Hynix decided to use
+ * a different extended ID format, and we should find
+ * a way to support it.
+ */
+ WARN(1, "Invalid ECC requirements");
+ }
+ } else {
+ /*
+ * The ECC requirements field meaning depends on the
+ * NAND technology.
+ */
+ u8 nand_tech = chip->id.data[5] & 0x3;
+
+ if (nand_tech < 3) {
+ /* > 26nm, reference: H27UBG8T2A datasheet */
+ if (ecc_level < 5) {
+ chip->ecc_step_ds = 512;
+ chip->ecc_strength_ds = 1 << ecc_level;
+ } else if (ecc_level < 7) {
+ if (ecc_level == 5)
+ chip->ecc_step_ds = 2048;
+ else
+ chip->ecc_step_ds = 1024;
+ chip->ecc_strength_ds = 24;
+ } else {
+ /*
+ * We should never reach this case, but if that
+ * happens, this probably means Hynix decided
+ * to use a different extended ID format, and
+ * we should find a way to support it.
+ */
+ WARN(1, "Invalid ECC requirements");
+ }
+ } else {
+ /* <= 26nm, reference: H27UBG8T2B datasheet */
+ if (!ecc_level) {
+ chip->ecc_step_ds = 0;
+ chip->ecc_strength_ds = 0;
+ } else if (ecc_level < 5) {
+ chip->ecc_step_ds = 512;
+ chip->ecc_strength_ds = 1 << (ecc_level - 1);
+ } else {
+ chip->ecc_step_ds = 1024;
+ chip->ecc_strength_ds = 24 +
+ (8 * (ecc_level - 5));
+ }
+ }
+ }
+}
+
+static void hynix_nand_extract_scrambling_requirements(struct nand_chip *chip,
+ bool valid_jedecid)
+{
+ u8 nand_tech;
+
+ /* We need scrambling on all TLC NANDs*/
+ if (chip->bits_per_cell > 2)
+ chip->options |= NAND_NEED_SCRAMBLING;
+
+ /* And on MLC NANDs with sub-3xnm process */
+ if (valid_jedecid) {
+ nand_tech = chip->id.data[5] >> 4;
+
+ /* < 3xnm */
+ if (nand_tech > 0)
+ chip->options |= NAND_NEED_SCRAMBLING;
} else {
+ nand_tech = chip->id.data[5] & 0x3;
+
+ /* < 32nm */
+ if (nand_tech > 2)
+ chip->options |= NAND_NEED_SCRAMBLING;
+ }
+}
+
+static void hynix_nand_decode_id(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ bool valid_jedecid;
+ u8 tmp;
+
+ /*
+ * Exclude all SLC NANDs from this advanced detection scheme.
+ * According to the ranges defined in several datasheets, it might
+ * appear that even SLC NANDs could fall in this extended ID scheme.
+ * If that the case rework the test to let SLC NANDs go through the
+ * detection process.
+ */
+ if (chip->id.len < 6 || nand_is_slc(chip)) {
nand_decode_ext_id(chip);
+ return;
}
+
+ /* Extract pagesize */
+ mtd->writesize = 2048 << (chip->id.data[3] & 0x03);
+
+ tmp = (chip->id.data[3] >> 4) & 0x3;
+ /*
+ * When bit7 is set that means we start counting at 1MiB, otherwise
+ * we start counting at 128KiB and shift this value the content of
+ * ID[3][4:5].
+ * The only exception is when ID[3][4:5] == 3 and ID[3][7] == 0, in
+ * this case the erasesize is set to 768KiB.
+ */
+ if (chip->id.data[3] & 0x80)
+ mtd->erasesize = SZ_1M << tmp;
+ else if (tmp == 3)
+ mtd->erasesize = SZ_512K + SZ_256K;
+ else
+ mtd->erasesize = SZ_128K << tmp;
+
+ /*
+ * Modern Toggle DDR NANDs have a valid JEDECID even though they are
+ * not exposing a valid JEDEC parameter table.
+ * These NANDs use a different NAND ID scheme.
+ */
+ valid_jedecid = hynix_nand_has_valid_jedecid(chip);
+
+ hynix_nand_extract_oobsize(chip, valid_jedecid);
+ hynix_nand_extract_ecc_requirements(chip, valid_jedecid);
+ hynix_nand_extract_scrambling_requirements(chip, valid_jedecid);
}
static int hynix_nand_init(struct nand_chip *chip)
More information about the linux-mtd-cvs
mailing list