[alsa-devel] [PATCH v2 3/4] spi: s3c64xx: add dma maxburst size initialization

[Grant Likely]

On Fri, 22 Feb 2013 17:09:18 +0900, Boojin Kim <boojin.kim at samsung.com> wrote:
> 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 at samsung.com>

Acked-by: Grant Likely <grant.likely at secretlab.ca>

This series probably needs to be merged together through the arm-soc
tree.

g.

> ---
>  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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-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.