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spi: xilinx_spi: Add support ops to axi qspi driver

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Add support_ops function to check controller supported operations by
spi-mem framework. Current default support ops function does not allow
dummy buswidth no more than 1, unless we are using buswidth is 4 for TX.
In order to support dummy buswidth > 1 by spi-nor framework we are adding
explicit support_ops to check controller supported operations.

Fix dummy bytes calculation incase of valid dummy bytes when dummy
buswidth is > 1. Current dummy bytes calculation does not provide
correct dummy values for dummy buswidth > 1.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/1657954727-31972-3-git-send-email-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
T Karthik Reddy 2022-07-16 12:28:47 +05:30 committed by Michal Simek
parent f2dd6599df
commit 557832bd88
1 changed files with 45 additions and 1 deletions
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46
drivers/spi/xilinx_spi.c
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@ -320,7 +320,9 @@ static int xilinx_spi_mem_exec_op(struct spi_slave *spi,
goto done;
}
if (op->dummy.nbytes) {
dummy_len = op->dummy.nbytes * op->data.buswidth;
dummy_len = (op->dummy.nbytes * op->data.buswidth) /
op->dummy.buswidth;
ret = start_transfer(spi, NULL, NULL, dummy_len);
if (ret)
goto done;
@ -342,6 +344,47 @@ done:
return ret;
}
static int xilinx_qspi_check_buswidth(struct spi_slave *slave, u8 width)
{
u32 mode = slave->mode;
switch (width) {
case 1:
return 0;
case 2:
if (mode & SPI_RX_DUAL)
return 0;
break;
case 4:
if (mode & SPI_RX_QUAD)
return 0;
break;
}
return -EOPNOTSUPP;
}
bool xilinx_qspi_mem_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
if (xilinx_qspi_check_buswidth(slave, op->cmd.buswidth))
return false;
if (op->addr.nbytes &&
xilinx_qspi_check_buswidth(slave, op->addr.buswidth))
return false;
if (op->dummy.nbytes &&
xilinx_qspi_check_buswidth(slave, op->dummy.buswidth))
return false;
if (op->data.dir != SPI_MEM_NO_DATA &&
xilinx_qspi_check_buswidth(slave, op->data.buswidth))
return false;
return true;
}
static int xilinx_spi_set_speed(struct udevice *bus, uint speed)
{
struct xilinx_spi_priv *priv = dev_get_priv(bus);
@ -379,6 +422,7 @@ static int xilinx_spi_set_mode(struct udevice *bus, uint mode)
static const struct spi_controller_mem_ops xilinx_spi_mem_ops = {
.exec_op = xilinx_spi_mem_exec_op,
.supports_op = xilinx_qspi_mem_exec_op,
};
static const struct dm_spi_ops xilinx_spi_ops = {