[PATCH] sh: DMA updates

This extends the current SH DMA API somewhat to support a proper virtual
channel abstraction, and also works to represent this through the driver model
by giving each DMAC its own platform device.

There's also a few other minor changes to support a few new CPU subtypes, and
make TEI generation for the SH DMAC configurable.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-sh/cpu-sh4/dma.h

@@ -1,17 +1,49 @@
 #ifndef __ASM_CPU_SH4_DMA_H
 #define __ASM_CPU_SH4_DMA_H
 
+#ifdef CONFIG_CPU_SH4A
+#define SH_DMAC_BASE	0xfc808020
+#else
 #define SH_DMAC_BASE	0xffa00000
+#endif
 
-#define SAR	((unsigned long[]){SH_DMAC_BASE + 0x00, SH_DMAC_BASE + 0x10, \
-				   SH_DMAC_BASE + 0x20, SH_DMAC_BASE + 0x30})
-#define DAR	((unsigned long[]){SH_DMAC_BASE + 0x04, SH_DMAC_BASE + 0x14, \
-				   SH_DMAC_BASE + 0x24, SH_DMAC_BASE + 0x34})
-#define DMATCR	((unsigned long[]){SH_DMAC_BASE + 0x08, SH_DMAC_BASE + 0x18, \
-				   SH_DMAC_BASE + 0x28, SH_DMAC_BASE + 0x38})
-#define CHCR	((unsigned long[]){SH_DMAC_BASE + 0x0c, SH_DMAC_BASE + 0x1c, \
-				   SH_DMAC_BASE + 0x2c, SH_DMAC_BASE + 0x3c})
-#define DMAOR	(SH_DMAC_BASE + 0x40)
+/* Definitions for the SuperH DMAC */
+#define TM_BURST	0x0000080
+#define TS_8		0x00000010
+#define TS_16		0x00000020
+#define TS_32		0x00000030
+#define TS_64		0x00000000
+
+#define CHCR_TS_MASK	0x30
+#define CHCR_TS_SHIFT	4
+
+#define DMAOR_COD	0x00000008
+
+#define DMAOR_INIT	( 0x8000 | DMAOR_DME )
+
+/*
+ * The SuperH DMAC supports a number of transmit sizes, we list them here,
+ * with their respective values as they appear in the CHCR registers.
+ *
+ * Defaults to a 64-bit transfer size.
+ */
+enum {
+	XMIT_SZ_64BIT,
+	XMIT_SZ_8BIT,
+	XMIT_SZ_16BIT,
+	XMIT_SZ_32BIT,
+	XMIT_SZ_256BIT,
+};
+
+/*
+ * The DMA count is defined as the number of bytes to transfer.
+ */
+static unsigned int ts_shift[] __attribute__ ((used)) = {
+	[XMIT_SZ_64BIT]		= 3,
+	[XMIT_SZ_8BIT]		= 0,
+	[XMIT_SZ_16BIT]		= 1,
+	[XMIT_SZ_32BIT]		= 2,
+	[XMIT_SZ_256BIT]	= 5,
+};
 
 #endif /* __ASM_CPU_SH4_DMA_H */
-