From aa4964c4eb3ed38666023bcb805403cb7cf2af63 Mon Sep 17 00:00:00 2001 From: Andi Shyti Date: Tue, 28 Jun 2016 11:41:11 +0900 Subject: [PATCH] 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: Andi Shyti Signed-off-by: Mark Brown --- drivers/spi/spi-s3c64xx.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 5a76a50063b5..972367d5c7f2 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -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); -- 2.39.5