[PATCH 1/6] mtd: spi-nor: Add quad page program support

Jagan Teki
2016-08-09T20:41:38Z

Add quad page program support with the use of nor->flags
and then controller will use 4 lines for data transmission
which is quite faster than page program(02h)

Cc: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>
---
drivers/mtd/spi-nor/spi-nor.c | 13 +++++++++++++
include/linux/mtd/spi-nor.h | 2 ++
2 files changed, 15 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index d0fc165..f88bd7e 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -75,6 +75,7 @@ struct flash_info {
* bit. Must be used with
* SPI_NOR_HAS_LOCK.
*/
+#define SPI_NOR_QUAD_WRITE BIT(10) /* Flash supports Quad Write */
};

#define JEDEC_MFR(info) ((info)->id[0])
@@ -1306,6 +1307,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
struct device *dev = nor->dev;
struct mtd_info *mtd = &nor->mtd;
struct device_node *np = spi_nor_get_flash_node(nor);
+ bool need_quad = false;
int ret;
int i;

@@ -1441,6 +1443,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
return ret;
}
nor->flash_read = SPI_NOR_QUAD;
+ need_quad = true;
} else if (mode == SPI_NOR_DUAL && info->flags & SPI_NOR_DUAL_READ) {
nor->flash_read = SPI_NOR_DUAL;
}
@@ -1465,6 +1468,16 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
}

nor->program_opcode = SPINOR_OP_PP;
+ if (nor->flags == SNOR_F_USE_QPP && info->flags & SPI_NOR_QUAD_WRITE) {
+ if (!need_quad)
+ ret = set_quad_mode(nor, info);
+ if (ret) {
+ dev_err(dev, "quad mode not supported\n");
+ return ret;
+ }
+ }
+ nor->program_opcode = SPINOR_OP_QPP;
+ }

if (info->addr_width)
nor->addr_width = info->addr_width;
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index c425c7b..aa0e6cd 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -46,6 +46,7 @@
#define SPINOR_OP_READ_1_1_2 0x3b /* Read data bytes (Dual SPI) */
#define SPINOR_OP_READ_1_1_4 0x6b /* Read data bytes (Quad SPI) */
#define SPINOR_OP_PP 0x02 /* Page program (up to 256 bytes) */
+#define SPINOR_OP_QPP 0x32 /* Quad Page program */
#define SPINOR_OP_BE_4K 0x20 /* Erase 4KiB block */
#define SPINOR_OP_BE_4K_PMC 0xd7 /* Erase 4KiB block on PMC chips */
#define SPINOR_OP_BE_32K 0x52 /* Erase 32KiB block */
@@ -119,6 +120,7 @@ enum spi_nor_ops {
enum spi_nor_option_flags {
SNOR_F_USE_FSR = BIT(0),
SNOR_F_HAS_SR_TB = BIT(1),
+ SNOR_F_USE_QPP = BIT(2),
};

/**
--
2.7.4