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

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Message-id: <001b01ce10d3$e9f78620$bde69260$%kim@samsung.com>
Date:	Fri, 22 Feb 2013 17:09:18 +0900
From:	Boojin Kim <boojin.kim@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	spi-devel-general@...ts.sourceforge.net,
	alsa-devel@...a-project.org
Cc:	'Vinod Koul' <vinod.koul@...el.com>, 'Dan Williams' <djbw@...com>,
	'Russell King' <linux@....linux.org.uk>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Grant Likely' <grant.likely@...retlab.ca>,
	'Mark Brown' <broonie@...nsource.wolfsonmicro.com>,
	'Rob Herring' <rob.herring@...xeda.com>,
	'Sangbeom Kim' <sbkim73@...sung.com>
Subject: [PATCH v2 3/4] spi: s3c64xx: add dma maxburst size initialization

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@...sung.com>
---
 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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