mtd: OneNAND: Detect the correct NOP when 4KiB pagesize

There are two different 4KiB pagesize chips
KFM4G16Q4M series have NOP 4 with version ID 0x0131
But KFM4G16Q5M has NOP 1 with versoin ID 0x013e

Note that Q5M means that it has NOP 1.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index ac9e959..51800a7 100644 (file)
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3429,6 +3429,19 @@ static void onenand_check_features(struct mtd_info *mtd)
                else if (numbufs == 1) {
                        this->options |= ONENAND_HAS_4KB_PAGE;
                        this->options |= ONENAND_HAS_CACHE_PROGRAM;
+                       /*
+                        * There are two different 4KiB pagesize chips
+                        * and no way to detect it by H/W config values.
+                        *
+                        * To detect the correct NOP for each chips,
+                        * It should check the version ID as workaround.
+                        *
+                        * Now it has as following
+                        * KFM4G16Q4M has NOP 4 with version ID 0x0131
+                        * KFM4G16Q5M has NOP 1 with versoin ID 0x013e
+                        */
+                       if ((this->version_id & 0xf) == 0xe)
+                               this->options |= ONENAND_HAS_NOP_1;
                }
 
        case ONENAND_DEVICE_DENSITY_2Gb:
@@ -4054,6 +4067,8 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
                        this->ecclayout = &onenand_oob_128;
                        mtd->subpage_sft = 2;
                }
+               if (ONENAND_IS_NOP_1(this))
+                       mtd->subpage_sft = 0;
                break;
        case 64:
                this->ecclayout = &onenand_oob_64;

diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 52b6f18..4596503 100644 (file)
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -184,6 +184,9 @@ struct onenand_chip {
 #define ONENAND_IS_CACHE_PROGRAM(this)                                 \
        (this->options & ONENAND_HAS_CACHE_PROGRAM)
 
+#define ONENAND_IS_NOP_1(this)                                         \
+       (this->options & ONENAND_HAS_NOP_1)
+
 /* Check byte access in OneNAND */
 #define ONENAND_CHECK_BYTE_ACCESS(addr)                (addr & 0x1)
 
@@ -195,6 +198,7 @@ struct onenand_chip {
 #define ONENAND_HAS_2PLANE             (0x0004)
 #define ONENAND_HAS_4KB_PAGE           (0x0008)
 #define ONENAND_HAS_CACHE_PROGRAM      (0x0010)
+#define ONENAND_HAS_NOP_1              (0x0020)
 #define ONENAND_SKIP_UNLOCK_CHECK      (0x0100)
 #define ONENAND_PAGEBUF_ALLOC          (0x1000)
 #define ONENAND_OOBBUF_ALLOC           (0x2000)