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mtd: spi-nor-core: Rework spansion_read_any_reg() to support Octal DTR mode

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In Infineon multi-die package parts, we need to use Read Any Register op
to read status register in 2nd or further die. Infineon S28HS02GT is
dual-die package and supports Octal DTR interface. To support this,
spansion_read_any_reg() needs to be reworked. Implementation is similar
to existing read_sr() that already supports Octal DTR mode.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Takahiro Kuwano 2023-12-22 14:46:00 +09:00 committed by Jagan Teki
parent a3a5cc7613
commit 9768d7c7ec
1 changed files with 29 additions and 5 deletions
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34
drivers/mtd/spi/spi-nor-core.c
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@ -331,12 +331,36 @@ static int spansion_read_any_reg(struct spi_nor *nor, u32 addr, u8 dummy,
u8 *val)
{
struct spi_mem_op op =
SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RD_ANY_REG, 1),
SPI_MEM_OP_ADDR(nor->addr_mode_nbytes, addr, 1),
SPI_MEM_OP_DUMMY(dummy / 8, 1),
SPI_MEM_OP_DATA_IN(1, NULL, 1));
SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RD_ANY_REG, 0),
SPI_MEM_OP_ADDR(nor->addr_mode_nbytes, addr, 0),
SPI_MEM_OP_DUMMY(dummy, 0),
SPI_MEM_OP_DATA_IN(1, NULL, 0));
u8 buf[2];
int ret;
return spi_nor_read_write_reg(nor, &op, val);
spi_nor_setup_op(nor, &op, nor->reg_proto);
/*
* In Octal DTR mode, the number of address bytes is always 4 regardless
* of addressing mode setting.
*/
if (nor->reg_proto == SNOR_PROTO_8_8_8_DTR)
op.addr.nbytes = 4;
/*
* We don't want to read only one byte in DTR mode. So, read 2 and then
* discard the second byte.
*/
if (spi_nor_protocol_is_dtr(nor->reg_proto))
op.data.nbytes = 2;
ret = spi_nor_read_write_reg(nor, &op, buf);
if (ret)
return ret;
*val = buf[0];
return 0;
}
static int spansion_write_any_reg(struct spi_nor *nor, u32 addr, u8 val)