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path: root/drivers/spi/spi-s3c64xx.c
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Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 480133ee1eb3..0f602cba1989 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -33,8 +33,9 @@
#include <linux/platform_data/spi-s3c64xx.h>
-#define MAX_SPI_PORTS 3
+#define MAX_SPI_PORTS 6
#define S3C64XX_SPI_QUIRK_POLL (1 << 0)
+#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1)
/* Registers and bit-fields */
@@ -78,6 +79,7 @@
#define S3C64XX_SPI_SLAVE_AUTO (1<<1)
#define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
+#define S3C64XX_SPI_SLAVE_NSC_CNT_2 (2<<4)
#define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
@@ -344,16 +346,8 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
spi->dma_tx = sdd->tx_dma.ch;
}
- ret = pm_runtime_get_sync(&sdd->pdev->dev);
- if (ret < 0) {
- dev_err(dev, "Failed to enable device: %d\n", ret);
- goto out_tx;
- }
-
return 0;
-out_tx:
- dma_release_channel(sdd->tx_dma.ch);
out_rx:
dma_release_channel(sdd->rx_dma.ch);
out:
@@ -370,7 +364,6 @@ static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
dma_release_channel(sdd->tx_dma.ch);
}
- pm_runtime_put(&sdd->pdev->dev);
return 0;
}
@@ -717,7 +710,12 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
enable_datapath(sdd, spi, xfer, use_dma);
/* Start the signals */
- writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ 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);
spin_unlock_irqrestore(&sdd->lock, flags);
@@ -866,13 +864,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
pm_runtime_put(&sdd->pdev->dev);
- writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
+ writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
return 0;
setup_exit:
pm_runtime_put(&sdd->pdev->dev);
/* setup() returns with device de-selected */
- writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
+ writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
if (gpio_is_valid(spi->cs_gpio))
gpio_free(spi->cs_gpio);
@@ -946,7 +946,8 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
sdd->cur_speed = 0;
- writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
+ writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
/* Disable Interrupts - we use Polling if not DMA mode */
writel(0, regs + S3C64XX_SPI_INT_EN);
@@ -1341,6 +1342,15 @@ static struct s3c64xx_spi_port_config exynos5440_spi_port_config = {
.quirks = S3C64XX_SPI_QUIRK_POLL,
};
+static struct s3c64xx_spi_port_config exynos7_spi_port_config = {
+ .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
+ .rx_lvl_offset = 15,
+ .tx_st_done = 25,
+ .high_speed = true,
+ .clk_from_cmu = true,
+ .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
+};
+
static struct platform_device_id s3c64xx_spi_driver_ids[] = {
{
.name = "s3c2443-spi",
@@ -1374,6 +1384,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
{ .compatible = "samsung,exynos5440-spi",
.data = (void *)&exynos5440_spi_port_config,
},
+ { .compatible = "samsung,exynos7-spi",
+ .data = (void *)&exynos7_spi_port_config,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);