Unverified Commit a273596b authored by Pratyush Yadav's avatar Pratyush Yadav Committed by Mark Brown
Browse files

spi: cadence-quadspi: Implement a simple supports_op hook 



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: default avatarPratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20201222184425.7028-6-p.yadav@ti.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7512eaf5

drivers/spi/spi-cadence-quadspi.c

+61 −0
Original line number Diff line number Diff line
@@ -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)