Commit aa4964c4 authored by Andi Shyti's avatar Andi Shyti Committed by Mark Brown
Browse files

spi: s3c64xx: group the CS signalling writes in a single function 



To enable/disable the CS line, the driver performs a writel in
the S3C64XX_SPI_SLAVE_SEL registers. Group the register's
configuration in a single function.

Signed-off-by: default avatarAndi Shyti <andi.shyti@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1a695a90

drivers/spi/spi-s3c64xx.c

+26 −10
Original line number Diff line number Diff line
@@ -310,6 +310,28 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, 
	dma_async_issue_pending(dma->ch);

}



static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)

{

	struct s3c64xx_spi_driver_data *sdd =

					spi_master_get_devdata(spi->master);



	if (enable) {

		if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {

			writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

		} else {

			u32 ssel = readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL);



			ssel |= (S3C64XX_SPI_SLAVE_AUTO |

						S3C64XX_SPI_SLAVE_NSC_CNT_2);

			writel(ssel, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

		}

	} else {

		if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT,

		sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	}

}



static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)

{

	struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
@@ -706,12 +728,7 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master, 
	enable_datapath(sdd, spi, xfer, use_dma);



	/* Start the signals */

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	else

		writel(readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL)

			| S3C64XX_SPI_SLAVE_AUTO | S3C64XX_SPI_SLAVE_NSC_CNT_2,

			sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	s3c64xx_spi_set_cs(spi, true);



	spin_unlock_irqrestore(&sdd->lock, flags);
@@ -861,16 +878,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi) 


	pm_runtime_mark_last_busy(&sdd->pdev->dev);

	pm_runtime_put_autosuspend(&sdd->pdev->dev);

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	s3c64xx_spi_set_cs(spi, false);



	return 0;



setup_exit:

	pm_runtime_mark_last_busy(&sdd->pdev->dev);

	pm_runtime_put_autosuspend(&sdd->pdev->dev);

	/* setup() returns with device de-selected */

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	s3c64xx_spi_set_cs(spi, false);



	if (gpio_is_valid(spi->cs_gpio))

		gpio_free(spi->cs_gpio);

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