A set of simple command sequences is provided which can be executed
directly by the host controller to enable octal DTR mode.
Each command sequence is 8 per byte for single SPI mode.
Signed-off-by: Mason Yang <masonccy...@mxic.com.tw>
---
drivers/mtd/spi-nor/core.h | 18 ++++++++
drivers/mtd/spi-nor/sfdp.c | 103 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+)
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 837f5e9..101726c 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -185,6 +185,21 @@ struct spi_nor_locking_ops {
};
/**
+ * struct cmd_seq_octal_dtr - command sequences to change to octal DTR mode
+ * Each command sequence is 8 per byte for single SPI mode.
+ * @len: commmand length of each command sequence.
+ * @opcode: command code.
+ * @addr: address offset to device.
+ * @data: data write to device.
+ */
+struct cmd_seq_octal_dtr {
+ u8 len;
+ u8 opcode;
+ u32 addr;
+ u8 data;
+};
+
+/**
* struct spi_nor_flash_parameter - SPI NOR flash parameters and settings.
* Includes legacy flash parameters and settings that can be overwritten
* by the spi_nor_fixups hooks, or dynamically when parsing the JESD216
@@ -207,6 +222,7 @@ struct spi_nor_locking_ops {
* higher index in the array, the higher priority.
* @erase_map: the erase map parsed from the SFDP Sector Map Parameter
* Table.
+ * @cmd_seq: command sequence to change to octal DTR mode.
* @quad_enable: enables SPI NOR quad mode.
* @set_4byte_addr_mode: puts the SPI NOR in 4 byte addressing mode.
* @convert_addr: converts an absolute address into something the flash
@@ -234,6 +250,8 @@ struct spi_nor_flash_parameter {
struct spi_nor_erase_map erase_map;
+ struct cmd_seq_octal_dtr cmd_seq[4];
+
int (*quad_enable)(struct spi_nor *nor);
int (*set_4byte_addr_mode)(struct spi_nor *nor, bool enable);
u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 550422b..fb5f9f3 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -21,6 +21,7 @@
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
#define SFDP_4BAIT_ID 0xff84 /* 4-byte Address Instruction Table */
#define SFDP_PROFILE1_ID 0xff05 /* xSPI Profile 1.0 table. */
+#define SFDP_CMD_TO_8DTR_ID 0xff0a /* Command Sequence to Octal DDR */
#define SFDP_SIGNATURE 0x50444653U
#define SFDP_JESD216_MAJOR 1
@@ -55,6 +56,19 @@ struct octal_max_speed {
u16 hz; /* MHz */
};
+#define CMD_TO_8DTR_LEN GENMASK(31, 24)
+#define CMD_TO_8DTR_OPCODE GENMASK(23, 16)
+#define CMD_TO_8DTR_1_ADDR GENMASK(15, 8)
+#define CMD_TO_8DTR_1_ADDR_DATA GENMASK(7, 0)
+#define CMD_TO_8DTR_4_ADDR_MSB GENMASK(15, 0)
+#define CMD_TO_8DTR_4_ADDR_LSB GENMASK(31, 16)
+#define CMD_TO_8DTR_4_ADDR_DATA GENMASK(15, 8)
+#define CMD_TO_8DTR_SIZE_MAX 8
+
+struct sfdp_cmd_to_8dtr {
+ u32 dwords[CMD_TO_8DTR_SIZE_MAX];
+};
+
struct sfdp_header {
u32 signature; /* Ox50444653U <=> "SFDP" */
u8 minor;
@@ -1248,6 +1262,90 @@ static int spi_nor_parse_profile1(struct spi_nor *nor,
}
/**
+ * spi_nor_parse_cmd_to_8dtr() - parse the command sequence to octal DTR
+ * @nor: pointer to a 'struct spi_nor'
+ * @param_header: command sequence to octal DTR parameter table header.
+ * @params: pointer to the 'struct spi_nor_flash_parameter' to be.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_parse_cmd_to_8dtr(struct spi_nor *nor,
+ const struct sfdp_parameter_header *header,
+ struct spi_nor_flash_parameter *params)
+{
+ struct sfdp_cmd_to_8dtr cmd_seq;
+ u32 i, j, addr;
+ size_t len;
+ int ret;
+
+ if (header->major != SFDP_JESD216_MAJOR ||
+ header->length < CMD_TO_8DTR_SIZE_MAX)
+ return -EINVAL;
+
+ len = min_t(size_t, sizeof(cmd_seq),
+ header->length * sizeof(u32));
+
+ memset(&cmd_seq, 0, sizeof(cmd_seq));
+
+ addr = SFDP_PARAM_HEADER_PTP(header);
+ ret = spi_nor_read_sfdp(nor, addr, len, &cmd_seq);
+ if (ret)
+ goto out;
+
+ /* Fix endianness of the Command Sequences to octal DTR. */
+ le32_to_cpu_array(cmd_seq.dwords, CMD_TO_8DTR_SIZE_MAX);
+
+ memset(params->cmd_seq, 0, sizeof(params->cmd_seq[4]));
+
+ for (i = 0, j = 0; i < 4 && j < 8; i++, j += 2) {
+ params->cmd_seq[i].len = FIELD_GET(CMD_TO_8DTR_LEN,
+ cmd_seq.dwords[j]);
+ if (!params->cmd_seq[i].len)
+ break;
+
+ switch (params->cmd_seq[i].len) {
+ case 1:
+ params->cmd_seq[i].opcode =
+ FIELD_GET(CMD_TO_8DTR_OPCODE,
+ cmd_seq.dwords[j]);
+ break;
+
+ case 3:
+ params->cmd_seq[i].opcode =
+ FIELD_GET(CMD_TO_8DTR_OPCODE,
+ cmd_seq.dwords[j]);
+ params->cmd_seq[i].addr =
+ FIELD_GET(CMD_TO_8DTR_1_ADDR,
+ cmd_seq.dwords[j]);
+ params->cmd_seq[i].data =
+ FIELD_GET(CMD_TO_8DTR_1_ADDR_DATA,
+ cmd_seq.dwords[j]);
+ break;
+
+ case 6:
+ params->cmd_seq[i].opcode =
+ FIELD_GET(CMD_TO_8DTR_OPCODE,
+ cmd_seq.dwords[j]);
+ params->cmd_seq[i].addr =
+ FIELD_GET(CMD_TO_8DTR_4_ADDR_MSB,
+ cmd_seq.dwords[j]) << 16 |
+ FIELD_GET(CMD_TO_8DTR_4_ADDR_LSB,
+ cmd_seq.dwords[j + 1]);
+ params->cmd_seq[i].data =
+ FIELD_GET(CMD_TO_8DTR_4_ADDR_DATA,
+ cmd_seq.dwords[j + 1]);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+out:
+ return ret;
+}
+
+/**
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
* @nor: pointer to a 'struct spi_nor'
* @params: pointer to the 'struct spi_nor_flash_parameter' to be
@@ -1352,6 +1450,11 @@ int spi_nor_parse_sfdp(struct spi_nor *nor,
err = spi_nor_parse_profile1(nor, param_header, params);
break;
+ case SFDP_CMD_TO_8DTR_ID:
+ err = spi_nor_parse_cmd_to_8dtr(nor,
+ param_header, params);
+ break;
+
default:
break;
}
--
1.9.1
