spi: DMA support for Designware core on Moorestown platform

From: Feng Tang <[email protected]>
Date: Tue, 4 Aug 2009 16:42:31 +0800
Subject: [PATCH 3/3] spi: DMA support for Designware core on Moorestown platform

Designware core can work with multiple DMA controllers for DMA operation, and this patch supports it to cowork with the Designware DMA controller used on Intel Moorestown platform

---
 drivers/spi/Kconfig        |    4 +
 drivers/spi/dw_spi.c       |  171 ++++++++++++++++++++++++++++++++++++++++++-
 include/linux/spi/dw_spi.h |    6 ++
 3 files changed, 177 insertions(+), 4 deletions(-)

index bd39e80..8132272 100644
@@ -250,6 +250,10 @@ config SPI_DESIGNWARE
 	help
 	  general driver for SPI controller core from DesignWare
 
+config SPI_DW_MRST_DMA
+	bool "DMA support for DW SPI controller on Intel Moorestown platform"
+	depends on SPI_DESGINWARE && MRST_DMA
+
 config SPI_DW_PCI
 	tristate "PCI interface driver for DW SPI core"
 	depends on SPI_DESIGNWARE && PCI

index 51b3e77..4881a18 100644
@@ -1,6 +1,7 @@
 #ifndef DW_SPI_HEADER_H
 #define DW_SPI_HEADER_H
 #include <linux/io.h>
+#include <linux/lnw_dma.h>
 
 /* Bit fields in CTRLR0 */
 #define SPI_DFS_OFFSET			0

@@ -141,6 +142,11 @@ struct dw_spi {
 	struct device		*dma_dev;
 	dma_addr_t		dma_addr;
 
+#ifdef CONFIG_SPI_MRST_DMA
+	struct lnw_dma_slave	dmas_tx;
+	struct lnw_dma_slave	dmas_rx;
+#endif
+
 	/* Bus interface info */
 	void			*priv;
 #ifdef CONFIG_DEBUG_FS

1.6.0.4

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