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spi: cadence-quadspi: Implement a simple supports_op hook

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The default SPI MEM supports_op hook rejects DTR ops by default. Add a
simple supports_op hook that very closely imitates the SPI MEM one. It
will be extended in later commits to allow DTR ops.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20201222184425.7028-6-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pratyush Yadav 2020-12-23 00:14:23 +05:30 committed by Mark Brown
parent 7512eaf541
commit a273596b9b
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GPG Key ID: 24D68B725D5487D0
1 changed files with 61 additions and 0 deletions
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61
drivers/spi/spi-cadence-quadspi.c
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@ -1031,6 +1031,66 @@ static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
return ret;
}
static int cqspi_check_buswidth_req(struct spi_mem *mem, u8 buswidth, bool tx)
{
u32 mode = mem->spi->mode;
switch (buswidth) {
case 1:
return 0;
case 2:
if ((tx &&
(mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL))) ||
(!tx &&
(mode & (SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL))))
return 0;
break;
case 4:
if ((tx && (mode & (SPI_TX_QUAD | SPI_TX_OCTAL))) ||
(!tx && (mode & (SPI_RX_QUAD | SPI_RX_OCTAL))))
return 0;
break;
case 8:
if ((tx && (mode & SPI_TX_OCTAL)) ||
(!tx && (mode & SPI_RX_OCTAL)))
return 0;
break;
default:
break;
}
return -EOPNOTSUPP;
}
static bool cqspi_supports_mem_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
if (cqspi_check_buswidth_req(mem, op->cmd.buswidth, true))
return false;
if (op->addr.nbytes &&
cqspi_check_buswidth_req(mem, op->addr.buswidth, true))
return false;
if (op->dummy.nbytes &&
cqspi_check_buswidth_req(mem, op->dummy.buswidth, true))
return false;
if (op->data.nbytes &&
cqspi_check_buswidth_req(mem, op->data.buswidth,
op->data.dir == SPI_MEM_DATA_OUT))
return false;
return true;
}
static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
struct cqspi_flash_pdata *f_pdata,
struct device_node *np)
@ -1159,6 +1219,7 @@ static const char *cqspi_get_name(struct spi_mem *mem)
static const struct spi_controller_mem_ops cqspi_mem_ops = {
.exec_op = cqspi_exec_mem_op,
.get_name = cqspi_get_name,
.supports_op = cqspi_supports_mem_op,
};
static int cqspi_setup_flash(struct cqspi_st *cqspi)