diff options
| author | Pratyush Yadav <p.yadav@ti.com> | 2020-06-24 00:00:15 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-07-14 17:29:38 +0100 |
| commit | caf72df48be32c39f74287976ae843501ae06949 (patch) | |
| tree | abdb40c182052d8987baaf5d716bc18c22d1b3c4 /drivers/spi/spi-mxic.c | |
| parent | 4c5e2bba30e49b970a0fd07b43e0b7a3b5fd5ea7 (diff) | |
spi: spi-mem: allow specifying a command's extension
In xSPI mode, flashes expect 2-byte opcodes. The second byte is called
the "command extension". There can be 3 types of extensions in xSPI:
repeat, invert, and hex. When the extension type is "repeat", the same
opcode is sent twice. When it is "invert", the second byte is the
inverse of the opcode. When it is "hex" an additional opcode byte based
is sent with the command whose value can be anything.
So, make opcode a 16-bit value and add a 'nbytes', similar to how
multiple address widths are handled.
Some places use sizeof(op->cmd.opcode). Replace them with op->cmd.nbytes
The spi-mxic and spi-zynq-qspi drivers directly use op->cmd.opcode as a
buffer. Now that opcode is a 2-byte field, this can result in different
behaviour depending on if the machine is little endian or big endian.
Extract the opcode in a local 1-byte variable and use that as the buffer
instead. Both these drivers would reject multi-byte opcodes in their
supports_op() hook anyway, so we only need to worry about single-byte
opcodes for now.
The above two changes are put in this commit to keep the series
bisectable.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200623183030.26591-3-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-mxic.c')
| -rw-r--r-- | drivers/spi/spi-mxic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c index 69491f3a515d..8c630acb0110 100644 --- a/drivers/spi/spi-mxic.c +++ b/drivers/spi/spi-mxic.c @@ -356,6 +356,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem, int nio = 1, i, ret; u32 ss_ctrl; u8 addr[8]; + u8 opcode = op->cmd.opcode; ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz); if (ret) @@ -393,7 +394,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem, writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT, mxic->regs + HC_CFG); - ret = mxic_spi_data_xfer(mxic, &op->cmd.opcode, NULL, 1); + ret = mxic_spi_data_xfer(mxic, &opcode, NULL, 1); if (ret) goto out; |