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Subject[PATCH v3 13/14] mtd: spi-nor: core: execute command sequences to change octal DTR mode
Date
Execute command sequences to change octal DTR mode.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
---
drivers/mtd/spi-nor/core.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/mtd/spi-nor/core.h | 3 ++
2 files changed, 74 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index a353830..caac58cd 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -425,6 +425,77 @@ int spi_nor_write_cr2(struct spi_nor *nor, u32 addr, u8 *cr2)
}

/**
+ * spi_nor_cmd_seq_octal_dtr() - command sequences to change to octal DTR mode
+ * @nor: pointer to 'struct spi_nor'.
+ * @enable: enable Octal DTR.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+int spi_nor_cmd_seq_octal_dtr(struct spi_nor *nor, bool enable)
+{
+ struct spi_nor_flash_parameter *p = nor->params;
+ struct cmd_seq_octal_dtr *cs = p->cmd_seq;
+ int i, ret;
+ struct spi_mem_op op;
+
+ if (!nor->spimem || !p->cmd_seq[0].len)
+ return -ENOTSUPP;
+
+ if (!enable)
+ return 0;
+
+ for (i = 0; i < CMD_SEQ_OCTAL_DTR_DWORD_LEN; i++) {
+ switch (p->cmd_seq[i].len) {
+ case 1:
+ op = (struct spi_mem_op)
+ SPI_MEM_OP(SPI_MEM_OP_CMD(cs[i].opcode, 1),
+ SPI_MEM_OP_NO_ADDR,
+ SPI_MEM_OP_NO_DUMMY,
+ SPI_MEM_OP_NO_DATA);
+
+ ret = spi_mem_exec_op(nor->spimem, &op);
+ if (ret)
+ return ret;
+ break;
+
+ case 3:
+ op = (struct spi_mem_op)
+ SPI_MEM_OP(SPI_MEM_OP_CMD(cs[i].opcode, 1),
+ SPI_MEM_OP_ADDR(1, cs[i].addr, 1),
+ SPI_MEM_OP_NO_DUMMY,
+ SPI_MEM_OP_DATA_OUT(1,
+ &cs[i].data, 1));
+
+ ret = spi_mem_exec_op(nor->spimem, &op);
+ if (ret)
+ return ret;
+ break;
+
+ case 6:
+ op = (struct spi_mem_op)
+ SPI_MEM_OP(SPI_MEM_OP_CMD(cs[i].opcode, 1),
+ SPI_MEM_OP_ADDR(4, cs[i].addr, 1),
+ SPI_MEM_OP_NO_DUMMY,
+ SPI_MEM_OP_DATA_OUT(1,
+ &cs[i].data, 1));
+
+ ret = spi_mem_exec_op(nor->spimem, &op);
+ if (ret)
+ return ret;
+ break;
+
+ default:
+ dev_err(nor->dev,
+ "Error %d sequences to Octal DTR\n",
+ p->cmd_seq[i].len);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+/**
* spi_nor_read_sr() - Read the Status Register.
* @nor: pointer to 'struct spi_nor'.
* @sr: pointer to a DMA-able buffer where the value of the
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 9b0e0ba..b47bc44d 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -199,6 +199,8 @@ struct cmd_seq_octal_dtr {
u8 data;
};

+#define CMD_SEQ_OCTAL_DTR_DWORD_LEN 4
+
/**
* struct spi_nor_flash_parameter - SPI NOR flash parameters and settings.
* Includes legacy flash parameters and settings that can be overwritten
@@ -442,6 +444,7 @@ void spi_nor_spimem_setup_op(const struct spi_nor *nor,
int spi_nor_write_disable(struct spi_nor *nor);
int spi_nor_read_cr2(struct spi_nor *nor, u32 addr, u8 *cr2);
int spi_nor_write_cr2(struct spi_nor *nor, u32 addr, u8 *cr2);
+int spi_nor_cmd_seq_octal_dtr(struct spi_nor *nor, bool enable);
int spi_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable);
int spi_nor_write_ear(struct spi_nor *nor, u8 ear);
int spi_nor_wait_till_ready(struct spi_nor *nor);
--
1.9.1
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