This patch adds dma maxburst size initialization.
The maxburst should be set by MODE_CFGn.DMA_TYPE,
because the pl330 dma driver supports burst mode.
Signed-off-by: Hyeonkook Kim <hk619.kim@xxxxxxxxxxx>
---
drivers/spi/spi-s3c64xx.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index e862ab8..5e6cafe 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -287,10 +287,20 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
struct s3c64xx_spi_driver_data *sdd;
struct samsung_dma_prep info;
struct samsung_dma_config config;
+ void __iomem *regs;
+ unsigned int mode_cfg;
if (dma->direction == DMA_DEV_TO_MEM) {
sdd = container_of((void *)dma,
struct s3c64xx_spi_driver_data, rx_dma);
+
+ regs = sdd->regs;
+ mode_cfg = readl(regs + S3C64XX_SPI_MODE_CFG);
+ if (mode_cfg & S3C64XX_SPI_MODE_4BURST)
+ config.maxburst = 4;
+ else
+ config.maxburst = 1;
+
config.direction = sdd->rx_dma.direction;
config.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
config.width = sdd->cur_bpw / 8;
@@ -298,6 +308,14 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
} else {
sdd = container_of((void *)dma,
struct s3c64xx_spi_driver_data, tx_dma);
+
+ regs = sdd->regs;
+ mode_cfg = readl(regs + S3C64XX_SPI_MODE_CFG);
+ if (mode_cfg & S3C64XX_SPI_MODE_4BURST)
+ config.maxburst = 4;
+ else
+ config.maxburst = 1;
+
config.direction = sdd->tx_dma.direction;
config.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
config.width = sdd->cur_bpw / 8;
--
1.7.5.4
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