[PATCH v3] mtd: spi-nor: sfdp: Get the 1-1-8 and 1-8-8 protocol from SFDP
Jaime Liao
jaimeliao.tw at gmail.com
Tue Dec 19 02:21:03 PST 2023
From: JaimeLiao <jaimeliao at mxic.com.tw>
BFPT 17th DWORD contains the information about 1-1-8
and 1-8-8, parse BFPT 17 DWORD instruction to determine
whether flash support 1-1-8 and 1-8-8, and set its dummy
cycles accordingly.
Protocols 1-1-8 and 1-8-8 support are not determined by a
single bit, so that use 8 bits instruction to determine
whether the protocol support or not.
Macronix spi-nor flash didn't support 1-8-8 read feature,
this patch validated 1-1-8 feature only on Xilinx board
zynq-picozed.
Signed-off-by: JaimeLiao <jaimeliao at mxic.com.tw>
Reviewed-by: Michael Walle <mwalle at kernel.org>
---
Changes in v3:
- Modify title of patch
- Parse 1-8-8 read as well
- Modify the typo descriptions in commit log
---
drivers/mtd/spi-nor/sfdp.c | 29 +++++++++++++++++++++++++++++
drivers/mtd/spi-nor/sfdp.h | 7 +++++++
2 files changed, 36 insertions(+)
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index b3b11dfed789..3f1eba83a7d8 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -446,6 +446,7 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
u32 dword;
u16 half;
u8 erase_mask;
+ u8 wait_states, mode_clocks, opcode;
/* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */
if (bfpt_header->length < BFPT_DWORD_MAX_JESD216)
@@ -631,6 +632,32 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B)
return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt);
+ /* Parse 1-1-8 read instruction */
+ opcode = FIELD_GET(BFPT_DWORD17_RD_1_1_8_CMD, bfpt.dwords[SFDP_DWORD(17)]);
+ if (opcode) {
+ mode_clocks = FIELD_GET(BFPT_DWORD17_RD_1_1_8_MODE_CLOCKS,
+ bfpt.dwords[SFDP_DWORD(17)]);
+ wait_states = FIELD_GET(BFPT_DWORD17_RD_1_1_8_WAIT_STATES,
+ bfpt.dwords[SFDP_DWORD(17)]);
+ nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8;
+ spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_1_1_8],
+ mode_clocks, wait_states, opcode,
+ SNOR_PROTO_1_1_8);
+ }
+
+ /* Parse 1-8-8 read instruction */
+ opcode = FIELD_GET(BFPT_DWORD17_RD_1_8_8_CMD, bfpt.dwords[SFDP_DWORD(17)]);
+ if (opcode) {
+ mode_clocks = FIELD_GET(BFPT_DWORD17_RD_1_8_8_MODE_CLOCKS,
+ bfpt.dwords[SFDP_DWORD(17)]);
+ wait_states = FIELD_GET(BFPT_DWORD17_RD_1_8_8_WAIT_STATES,
+ bfpt.dwords[SFDP_DWORD(17)]);
+ nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_1_8_8;
+ spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_1_8_8],
+ mode_clocks, wait_states, opcode,
+ SNOR_PROTO_1_8_8);
+ }
+
/* 8D-8D-8D command extension. */
switch (bfpt.dwords[SFDP_DWORD(18)] & BFPT_DWORD18_CMD_EXT_MASK) {
case BFPT_DWORD18_CMD_EXT_REP:
@@ -968,6 +995,8 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
{ SNOR_HWCAPS_READ_1_1_1_DTR, BIT(13) },
{ SNOR_HWCAPS_READ_1_2_2_DTR, BIT(14) },
{ SNOR_HWCAPS_READ_1_4_4_DTR, BIT(15) },
+ { SNOR_HWCAPS_READ_1_1_8, BIT(20) },
+ { SNOR_HWCAPS_READ_1_8_8, BIT(21) },
};
static const struct sfdp_4bait programs[] = {
{ SNOR_HWCAPS_PP, BIT(6) },
diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
index 6eb99e1cdd61..da0fe5aa9bb0 100644
--- a/drivers/mtd/spi-nor/sfdp.h
+++ b/drivers/mtd/spi-nor/sfdp.h
@@ -118,6 +118,13 @@ struct sfdp_bfpt {
(BFPT_DWORD16_EN4B_EN4B | BFPT_DWORD16_EX4B_EX4B)
#define BFPT_DWORD16_SWRST_EN_RST BIT(12)
+#define BFPT_DWORD17_RD_1_1_8_CMD GENMASK(31, 24)
+#define BFPT_DWORD17_RD_1_1_8_MODE_CLOCKS GENMASK(23, 21)
+#define BFPT_DWORD17_RD_1_1_8_WAIT_STATES GENMASK(20, 16)
+#define BFPT_DWORD17_RD_1_8_8_CMD GENMASK(15, 8)
+#define BFPT_DWORD17_RD_1_8_8_MODE_CLOCKS GENMASK(7, 5)
+#define BFPT_DWORD17_RD_1_8_8_WAIT_STATES GENMASK(4, 0)
+
#define BFPT_DWORD18_CMD_EXT_MASK GENMASK(30, 29)
#define BFPT_DWORD18_CMD_EXT_REP (0x0UL << 29) /* Repeat */
#define BFPT_DWORD18_CMD_EXT_INV (0x1UL << 29) /* Invert */
--
2.25.1
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