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Subject[PATCH v6 09/17] mtd: nand: Move Samsung specific init/detection logic in nand_samsung.c
Date
Move Samsung specific initialization and detection logic into
nand_samsung.c. This is part of the "separate vendor specific code from
core" cleanup process.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/nand_base.c | 52 ++---------------------
drivers/mtd/nand/nand_ids.c | 4 +-
drivers/mtd/nand/nand_samsung.c | 92 +++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/nand.h | 2 +
5 files changed, 101 insertions(+), 50 deletions(-)
create mode 100644 drivers/mtd/nand/nand_samsung.c

diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index bfd5d12b9ade..d4b90b0f879e 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -61,3 +61,4 @@ obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
obj-$(CONFIG_MTD_NAND_MTK) += mtk_nand.o mtk_ecc.o

nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
+nand-objs += nand_samsung.o
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 07f075afce49..1c2253a0868c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3792,48 +3792,13 @@ void nand_decode_ext_id(struct nand_chip *chip)
/*
* Field definitions are in the following datasheets:
* Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32)
- * New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44)
* Hynix MLC (6 byte ID): Hynix H27UBG8T2B (p.22)
*
* Check for ID length, non-zero 6th byte, cell type, and Hynix/Samsung
* ID to decide what to do.
*/
- if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG &&
- !nand_is_slc(chip) && id_data[5] != 0x00) {
- /* Calc pagesize */
- mtd->writesize = 2048 << (extid & 0x03);
- extid >>= 2;
- /* Calc oobsize */
- switch (((extid >> 2) & 0x04) | (extid & 0x03)) {
- case 1:
- mtd->oobsize = 128;
- break;
- case 2:
- mtd->oobsize = 218;
- break;
- case 3:
- mtd->oobsize = 400;
- break;
- case 4:
- mtd->oobsize = 436;
- break;
- case 5:
- mtd->oobsize = 512;
- break;
- case 6:
- mtd->oobsize = 640;
- break;
- case 7:
- default: /* Other cases are "reserved" (unknown) */
- mtd->oobsize = 1024;
- break;
- }
- extid >>= 2;
- /* Calc blocksize */
- mtd->erasesize = (128 * 1024) <<
- (((extid >> 1) & 0x04) | (extid & 0x03));
- } else if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX &&
- !nand_is_slc(chip)) {
+ if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX &&
+ !nand_is_slc(chip)) {
unsigned int tmp;

/* Calc pagesize */
@@ -3961,13 +3926,10 @@ static void nand_decode_bbm_options(struct nand_chip *chip)
* Micron devices with 2KiB pages and on SLC Samsung, Hynix, Toshiba,
* AMD/Spansion, and Macronix. All others scan only the first page.
*/
- if (!nand_is_slc(chip) &&
- (maf_id == NAND_MFR_SAMSUNG ||
- maf_id == NAND_MFR_HYNIX))
+ if (!nand_is_slc(chip) && maf_id == NAND_MFR_HYNIX)
chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
else if ((nand_is_slc(chip) &&
- (maf_id == NAND_MFR_SAMSUNG ||
- maf_id == NAND_MFR_HYNIX ||
+ (maf_id == NAND_MFR_HYNIX ||
maf_id == NAND_MFR_TOSHIBA ||
maf_id == NAND_MFR_AMD ||
maf_id == NAND_MFR_MACRONIX)) ||
@@ -4162,12 +4124,6 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
/* Get chip options */
chip->options |= type->options;

- /*
- * Check if chip is not a Samsung device. Do not clear the
- * options for chips which do not have an extended id.
- */
- if (maf_id != NAND_MFR_SAMSUNG && !type->pagesize)
- chip->options &= ~NAND_SAMSUNG_LP_OPTIONS;
ident_done:

if (chip->options & NAND_BUSWIDTH_AUTO) {
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index 0c5589bb4624..9209054310cf 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -10,7 +10,7 @@
#include <linux/mtd/nand.h>
#include <linux/sizes.h>

-#define LP_OPTIONS NAND_SAMSUNG_LP_OPTIONS
+#define LP_OPTIONS 0
#define LP_OPTIONS16 (LP_OPTIONS | NAND_BUSWIDTH_16)

#define SP_OPTIONS NAND_NEED_READRDY
@@ -172,7 +172,7 @@ struct nand_flash_dev nand_flash_ids[] = {
static const struct nand_manufacturer nand_manufacturers[] = {
{NAND_MFR_TOSHIBA, "Toshiba"},
{NAND_MFR_ESMT, "ESMT"},
- {NAND_MFR_SAMSUNG, "Samsung"},
+ {NAND_MFR_SAMSUNG, "Samsung", &samsung_nand_manuf_ops},
{NAND_MFR_FUJITSU, "Fujitsu"},
{NAND_MFR_NATIONAL, "National"},
{NAND_MFR_RENESAS, "Renesas"},
diff --git a/drivers/mtd/nand/nand_samsung.c b/drivers/mtd/nand/nand_samsung.c
new file mode 100644
index 000000000000..5c259dd5b652
--- /dev/null
+++ b/drivers/mtd/nand/nand_samsung.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2017 Free Electrons
+ * Copyright (C) 2017 NextThing Co
+ *
+ * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/mtd/nand.h>
+
+static void samsung_nand_decode_id(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */
+ if (chip->id.len == 6 && !nand_is_slc(chip) &&
+ chip->id.data[5] != 0x00) {
+ u8 extid = chip->id.data[3];
+
+ /* Get pagesize */
+ mtd->writesize = 2048 << (extid & 0x03);
+
+ extid >>= 2;
+
+ /* Get oobsize */
+ switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
+ case 1:
+ mtd->oobsize = 128;
+ break;
+ case 2:
+ mtd->oobsize = 218;
+ break;
+ case 3:
+ mtd->oobsize = 400;
+ break;
+ case 4:
+ mtd->oobsize = 436;
+ break;
+ case 5:
+ mtd->oobsize = 512;
+ break;
+ case 6:
+ mtd->oobsize = 640;
+ break;
+ default:
+ /*
+ * We should never reach this case, but if that
+ * happens, this probably means Samsung decided to use
+ * a different extended ID format, and we should find
+ * a way to support it.
+ */
+ WARN(1, "Invalid OOB size value");
+ break;
+ }
+
+ /* Get blocksize */
+ extid >>= 2;
+ mtd->erasesize = (128 * 1024) <<
+ (((extid >> 1) & 0x04) | (extid & 0x03));
+ } else {
+ nand_decode_ext_id(chip);
+ }
+}
+
+static int samsung_nand_init(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ if (mtd->writesize > 512)
+ chip->options |= NAND_SAMSUNG_LP_OPTIONS;
+
+ if (!nand_is_slc(chip))
+ chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
+ else
+ chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
+
+ return 0;
+}
+
+const struct nand_manufacturer_ops samsung_nand_manuf_ops = {
+ .detect = samsung_nand_decode_id,
+ .init = samsung_nand_init,
+};
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 703907bd1ade..d95f0a44bb47 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -1107,6 +1107,8 @@ nand_manufacturer_name(const struct nand_manufacturer *manufacturer)

extern struct nand_flash_dev nand_flash_ids[];

+extern const struct nand_manufacturer_ops samsung_nand_manuf_ops;
+
int nand_default_bbt(struct mtd_info *mtd);
int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs);
int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs);
--
2.7.4
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