[PATCH 07/13] mtd: spinand: winbond: Add basic support for W25N02LV

[Miquel Raynal]

$ nandbiterrs -i /dev/mtd0
incremental biterrors test
Successfully corrected 0 bit errors per subpage
Inserted biterror @ 0/5
Read reported 1 corrected bit errors
Successfully corrected 1 bit errors per subpage
Inserted biterror @ 0/2
Read reported 2 corrected bit errors
Successfully corrected 2 bit errors per subpage
Inserted biterror @ 0/0
Read reported 3 corrected bit errors
Successfully corrected 3 bit errors per subpage
Inserted biterror @ 1/7
Read reported 4 corrected bit errors
Successfully corrected 4 bit errors per subpage
Inserted biterror @ 1/5
Read reported 5 corrected bit errors
Successfully corrected 5 bit errors per subpage
Inserted biterror @ 1/2
Read reported 6 corrected bit errors
Successfully corrected 6 bit errors per subpage
Inserted biterror @ 1/0
Read reported 7 corrected bit errors
Successfully corrected 7 bit errors per subpage
Inserted biterror @ 2/6
Read reported 8 corrected bit errors
Successfully corrected 8 bit errors per subpage
Inserted biterror @ 2/5
Failed to recover 1 bitflips
Read error after 9 bit errors per page

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/spi/winbond.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 72f041b87bda..e14f026fc99d 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -210,6 +210,22 @@ static SPINAND_OP_VARIANTS(cont_read_cache_dual_quad_dtr_variants,
 		/* The 1S_1D_1D variant would require 4.5 dummy bytes, this is not possible */
 		WINBOND_CONT_READ_FROM_CACHE_FAST_1S_1S_1S_OP(4, NULL, 0, 0));
 
+/*
+ * Unlike the other devices, W25NxxLV/LW capable chips have an absolute maximum
+ * frequency of 133MHz.
+ */
+
+static SPINAND_OP_VARIANTS(w25nxxlv_read_cache_variants,
+		SPINAND_PAGE_READ_FROM_CACHE_1S_4D_4D_OP(0, 8, NULL, 0, 66 * HZ_PER_MHZ),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_1D_4D_OP(0, 2, NULL, 0, 66 * HZ_PER_MHZ),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_4S_4S_OP(0, 2, NULL, 0, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_OP(0, 1, NULL, 0, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_2S_2S_OP(0, 1, NULL, 0, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_2S_OP(0, 1, NULL, 0, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_1D_1D_OP(0, 2, NULL, 0, 66 * HZ_PER_MHZ),
+		SPINAND_PAGE_READ_FROM_CACHE_FAST_1S_1S_1S_OP(0, 1, NULL, 0, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_1S_OP(0, 1, NULL, 0, 0));
+
 static SPINAND_OP_VARIANTS(read_cache_variants,
 		SPINAND_PAGE_READ_FROM_CACHE_1S_4S_4S_OP(0, 2, NULL, 0, 0),
 		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_OP(0, 1, NULL, 0, 0),
@@ -799,6 +815,15 @@ static const struct spinand_info winbond_spinand_table[] = {
 					      &update_cache_variants),
 		     0,
 		     SPINAND_ECCINFO(&w25nxxkv_kw_ooblayout, w25nxxkv_kw_lv_lw_ecc_get_status)),
+	SPINAND_INFO("W25N02LV", /* 3.3V */
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x8a, 0x22),
+		     NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
+		     NAND_ECCREQ(8, 512),
+		     SPINAND_INFO_OP_VARIANTS(&w25nxxlv_read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     0,
+		     SPINAND_ECCINFO(&w25nxxlv_lw_ooblayout, w25nxxkv_kw_lv_lw_ecc_get_status)),
 	SPINAND_INFO("W35N02JW", /* 1.8V */
 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xdf, 0x22),
 		     NAND_MEMORG(1, 4096, 128, 64, 512, 10, 1, 2, 1),

-- 
2.56.0