Blackfin: bfin_spi: add optional DMA support

This moves the last piece from the old spi_flash driver to the new SPI
framework -- optional DMA RX support.  This typically cuts speeds by ~40%
at the cost of additional ~300 bytes.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
new file mode 100644
index 0000000..21ff1cf
--- /dev/null
+++ b/arch/blackfin/include/asm/dma.h
@@ -0,0 +1,75 @@
+/*
+ * dma.h - Blackfin DMA defines/structures/etc...
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef _BLACKFIN_DMA_H_
+#define _BLACKFIN_DMA_H_
+
+#include <asm/mach-common/bits/dma.h>
+
+struct dmasg_large {
+	void *next_desc_addr;
+	unsigned long start_addr;
+	unsigned short cfg;
+	unsigned short x_count;
+	short x_modify;
+	unsigned short y_count;
+	short y_modify;
+} __attribute__((packed));
+
+struct dmasg {
+	unsigned long start_addr;
+	unsigned short cfg;
+	unsigned short x_count;
+	short x_modify;
+	unsigned short y_count;
+	short y_modify;
+} __attribute__((packed));
+
+struct dma_register {
+	void *next_desc_ptr;	/* DMA Next Descriptor Pointer register */
+	unsigned long start_addr;	/* DMA Start address  register */
+
+	unsigned short cfg;	/* DMA Configuration register */
+	unsigned short dummy1;	/* DMA Configuration register */
+
+	unsigned long reserved;
+
+	unsigned short x_count;	/* DMA x_count register */
+	unsigned short dummy2;
+
+	short x_modify;	/* DMA x_modify register */
+	unsigned short dummy3;
+
+	unsigned short y_count;	/* DMA y_count register */
+	unsigned short dummy4;
+
+	short y_modify;	/* DMA y_modify register */
+	unsigned short dummy5;
+
+	void *curr_desc_ptr;	/* DMA Current Descriptor Pointer
+					   register */
+	unsigned long curr_addr_ptr;	/* DMA Current Address Pointer
+						   register */
+	unsigned short irq_status;	/* DMA irq status register */
+	unsigned short dummy6;
+
+	unsigned short peripheral_map;	/* DMA peripheral map register */
+	unsigned short dummy7;
+
+	unsigned short curr_x_count;	/* DMA Current x-count register */
+	unsigned short dummy8;
+
+	unsigned long reserved2;
+
+	unsigned short curr_y_count;	/* DMA Current y-count register */
+	unsigned short dummy9;
+
+	unsigned long reserved3;
+
+};
+
+#endif