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

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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: Andi Shyti <andi.shyti@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andi Shyti 2016-06-28 11:41:11 +09:00 committed by Mark Brown
parent 1a695a905c
commit aa4964c4eb
1 changed files with 26 additions and 10 deletions
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36
drivers/spi/spi-s3c64xx.c
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@ -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);