diff --git a/arch/sh/drivers/dma/dma-sh.c b/arch/sh/drivers/dma/dma-sh.c
index b2256562314298e0e63918b7f60323691e08d5b3..afde2a7d3eb35859270fe4a3bbdf20d742b8b35a 100644
--- a/arch/sh/drivers/dma/dma-sh.c
+++ b/arch/sh/drivers/dma/dma-sh.c
@@ -25,7 +25,7 @@
  * Define the default configuration for dual address memory-memory transfer.
  * The 0x400 value represents auto-request, external->external.
  */
-#define RS_DUAL	(DM_INC | SM_INC | 0x400 | TS_INDEX2VAL(XMIT_SZ_32BIT))
+#define RS_DUAL	(DM_INC | SM_INC | RS_AUTO | TS_INDEX2VAL(XMIT_SZ_32BIT))
 
 static unsigned long dma_find_base(unsigned int chan)
 {
diff --git a/arch/sh/include/asm/dma-register.h b/arch/sh/include/asm/dma-register.h
index 51cd78feacff0bea6a442e37df7f532e62bfe3f5..c757b47e6b6481ff6ad49254b2f0b209f4e3d7af 100644
--- a/arch/sh/include/asm/dma-register.h
+++ b/arch/sh/include/asm/dma-register.h
@@ -13,17 +13,17 @@
 #ifndef DMA_REGISTER_H
 #define DMA_REGISTER_H
 
-/* DMA register */
-#define SAR	0x00
-#define DAR	0x04
-#define TCR	0x08
-#define CHCR	0x0C
-#define DMAOR	0x40
+/* DMA registers */
+#define SAR	0x00	/* Source Address Register */
+#define DAR	0x04	/* Destination Address Register */
+#define TCR	0x08	/* Transfer Count Register */
+#define CHCR	0x0C	/* Channel Control Register */
+#define DMAOR	0x40	/* DMA Operation Register */
 
 /* DMAOR definitions */
-#define DMAOR_AE	0x00000004
+#define DMAOR_AE	0x00000004	/* Address Error Flag */
 #define DMAOR_NMIF	0x00000002
-#define DMAOR_DME	0x00000001
+#define DMAOR_DME	0x00000001	/* DMA Master Enable */
 
 /* Definitions for the SuperH DMAC */
 #define REQ_L	0x00000000
@@ -34,18 +34,20 @@
 #define ACK_W	0x00020000
 #define ACK_H	0x00000000
 #define ACK_L	0x00010000
-#define DM_INC	0x00004000
-#define DM_DEC	0x00008000
-#define DM_FIX	0x0000c000
-#define SM_INC	0x00001000
-#define SM_DEC	0x00002000
-#define SM_FIX	0x00003000
+#define DM_INC	0x00004000	/* Destination addresses are incremented */
+#define DM_DEC	0x00008000	/* Destination addresses are decremented */
+#define DM_FIX	0x0000c000	/* Destination address is fixed */
+#define SM_INC	0x00001000	/* Source addresses are incremented */
+#define SM_DEC	0x00002000	/* Source addresses are decremented */
+#define SM_FIX	0x00003000	/* Source address is fixed */
 #define RS_IN	0x00000200
 #define RS_OUT	0x00000300
+#define RS_AUTO	0x00000400	/* Auto Request */
+#define RS_ERS	0x00000800	/* DMA extended resource selector */
 #define TS_BLK	0x00000040
 #define TM_BUR	0x00000020
-#define CHCR_DE	0x00000001
-#define CHCR_TE	0x00000002
-#define CHCR_IE	0x00000004
+#define CHCR_DE	0x00000001	/* DMA Enable */
+#define CHCR_TE	0x00000002	/* Transfer End Flag */
+#define CHCR_IE	0x00000004	/* Interrupt Enable */
 
 #endif
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
index 57f83a92a505a639b02beba2b0494ea93d8aa3c5..7aa733307afcca4920a2a023934a1d7bfe0e7158 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
@@ -30,62 +30,62 @@ static const struct sh_dmae_slave_config sh7722_dmae_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF0_TX,
 		.addr		= 0xffe0000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x21,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF0_RX,
 		.addr		= 0xffe00014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x22,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF1_TX,
 		.addr		= 0xffe1000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x25,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF1_RX,
 		.addr		= 0xffe10014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x26,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF2_TX,
 		.addr		= 0xffe2000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x29,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF2_RX,
 		.addr		= 0xffe20014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2a,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SIUA_TX,
 		.addr		= 0xa454c098,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xb1,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SIUA_RX,
 		.addr		= 0xa454c090,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xb2,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SIUB_TX,
 		.addr		= 0xa454c09c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xb5,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SIUB_RX,
 		.addr		= 0xa454c094,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xb6,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI0_TX,
 		.addr		= 0x04ce0030,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc1,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI0_RX,
 		.addr		= 0x04ce0030,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc2,
 	},
 };
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
index b9e84b1d3aa72c9e38a6992c35a3d57f94093ea6..ea5780b3c7f6a0999cc0392c9c11c7dcab61cf40 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
@@ -36,122 +36,122 @@ static const struct sh_dmae_slave_config sh7724_dmae_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF0_TX,
 		.addr		= 0xffe0000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x21,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF0_RX,
 		.addr		= 0xffe00014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x22,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF1_TX,
 		.addr		= 0xffe1000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x25,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF1_RX,
 		.addr		= 0xffe10014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x26,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF2_TX,
 		.addr		= 0xffe2000c,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x29,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF2_RX,
 		.addr		= 0xffe20014,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2a,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF3_TX,
 		.addr		= 0xa4e30020,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2d,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF3_RX,
 		.addr		= 0xa4e30024,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2e,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF4_TX,
 		.addr		= 0xa4e40020,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x31,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF4_RX,
 		.addr		= 0xa4e40024,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x32,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF5_TX,
 		.addr		= 0xa4e50020,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x35,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SCIF5_RX,
 		.addr		= 0xa4e50024,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_8BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x36,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB0D0_TX,
 		.addr		= 0xA4D80100,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0x73,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB0D0_RX,
 		.addr		= 0xA4D80100,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0x73,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB0D1_TX,
 		.addr		= 0xA4D80120,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0x77,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB0D1_RX,
 		.addr		= 0xA4D80120,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0x77,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB1D0_TX,
 		.addr		= 0xA4D90100,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xab,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB1D0_RX,
 		.addr		= 0xA4D90100,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xab,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB1D1_TX,
 		.addr		= 0xA4D90120,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xaf,
 	}, {
 		.slave_id	= SHDMA_SLAVE_USB1D1_RX,
 		.addr		= 0xA4D90120,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_32BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xaf,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI0_TX,
 		.addr		= 0x04ce0030,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc1,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI0_RX,
 		.addr		= 0x04ce0030,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc2,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI1_TX,
 		.addr		= 0x04cf0030,
-		.chcr		= DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc9,
 	}, {
 		.slave_id	= SHDMA_SLAVE_SDHI1_RX,
 		.addr		= 0x04cf0030,
-		.chcr		= DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+		.chcr		= DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xca,
 	},
 };
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7757.c b/arch/sh/kernel/cpu/sh4a/setup-sh7757.c
index 7b24ec4b409aef03df85a72372ebec4d4d11757b..18bcd70cd813f12e5dbdb64f8cb9191f87a124cf 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7757.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7757.c
@@ -123,28 +123,28 @@ static const struct sh_dmae_slave_config sh7757_dmae0_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_SDHI_TX,
 		.addr		= 0x1fe50030,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc5,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SDHI_RX,
 		.addr		= 0x1fe50030,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc6,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_MMCIF_TX,
 		.addr		= 0x1fcb0034,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xd3,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_MMCIF_RX,
 		.addr		= 0x1fcb0034,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_32BIT),
 		.mid_rid	= 0xd7,
 	},
@@ -154,56 +154,56 @@ static const struct sh_dmae_slave_config sh7757_dmae1_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF2_TX,
 		.addr		= 0x1f4b000c,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x21,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF2_RX,
 		.addr		= 0x1f4b0014,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x22,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF3_TX,
 		.addr		= 0x1f4c000c,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x29,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF3_RX,
 		.addr		= 0x1f4c0014,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2a,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF4_TX,
 		.addr		= 0x1f4d000c,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x41,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_SCIF4_RX,
 		.addr		= 0x1f4d0014,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x42,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RSPI_TX,
 		.addr		= 0xfe480004,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc1,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RSPI_RX,
 		.addr		= 0xfe480004,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_16BIT),
 		.mid_rid	= 0xc2,
 	},
@@ -213,70 +213,70 @@ static const struct sh_dmae_slave_config sh7757_dmae2_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC0_TX,
 		.addr		= 0x1e500012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x21,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC0_RX,
 		.addr		= 0x1e500013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x22,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC1_TX,
 		.addr		= 0x1e510012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x29,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC1_RX,
 		.addr		= 0x1e510013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2a,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC2_TX,
 		.addr		= 0x1e520012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xa1,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC2_RX,
 		.addr		= 0x1e520013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xa2,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC3_TX,
 		.addr		= 0x1e530012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xa9,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC3_RX,
 		.addr		= 0x1e530013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xaf,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC4_TX,
 		.addr		= 0x1e540012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xc5,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC4_RX,
 		.addr		= 0x1e540013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0xc6,
 	},
@@ -286,70 +286,70 @@ static const struct sh_dmae_slave_config sh7757_dmae3_slaves[] = {
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC5_TX,
 		.addr		= 0x1e550012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x21,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC5_RX,
 		.addr		= 0x1e550013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x22,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC6_TX,
 		.addr		= 0x1e560012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x29,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC6_RX,
 		.addr		= 0x1e560013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x2a,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC7_TX,
 		.addr		= 0x1e570012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x41,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC7_RX,
 		.addr		= 0x1e570013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x42,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC8_TX,
 		.addr		= 0x1e580012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x45,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC8_RX,
 		.addr		= 0x1e580013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x46,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC9_TX,
 		.addr		= 0x1e590012,
-		.chcr		= SM_INC | 0x800 | 0x40000000 |
+		.chcr		= SM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x51,
 	},
 	{
 		.slave_id	= SHDMA_SLAVE_RIIC9_RX,
 		.addr		= 0x1e590013,
-		.chcr		= DM_INC | 0x800 | 0x40000000 |
+		.chcr		= DM_INC | RS_ERS | 0x40000000 |
 				  TS_INDEX2VAL(XMIT_SZ_8BIT),
 		.mid_rid	= 0x52,
 	},
diff --git a/drivers/dma/sh/shdma-arm.h b/drivers/dma/sh/shdma-arm.h
index a2b8258426c940f0a813c8d854a634cc212e0289..a1b0ef45d6a2f664262f009df1d108099aac5ffc 100644
--- a/drivers/dma/sh/shdma-arm.h
+++ b/drivers/dma/sh/shdma-arm.h
@@ -45,7 +45,7 @@ enum {
 	((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\
 	 (((i) & TS_HI_BIT)  << TS_HI_SHIFT))
 
-#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL((xmit_sz)))
-#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL((xmit_sz)))
+#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL((xmit_sz)))
+#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL((xmit_sz)))
 
 #endif
diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
index 146d5df926db00364429cbe75ce9ff84e9dddf46..58eb85770eba8e07e16b9dab1da321bf318369e3 100644
--- a/drivers/dma/sh/shdmac.c
+++ b/drivers/dma/sh/shdmac.c
@@ -38,12 +38,12 @@
 #include "../dmaengine.h"
 #include "shdma.h"
 
-/* DMA register */
-#define SAR	0x00
-#define DAR	0x04
-#define TCR	0x08
-#define CHCR	0x0C
-#define DMAOR	0x40
+/* DMA registers */
+#define SAR	0x00	/* Source Address Register */
+#define DAR	0x04	/* Destination Address Register */
+#define TCR	0x08	/* Transfer Count Register */
+#define CHCR	0x0C	/* Channel Control Register */
+#define DMAOR	0x40	/* DMA Operation Register */
 
 #define TEND	0x18 /* USB-DMAC */
 
@@ -239,9 +239,8 @@ static void dmae_init(struct sh_dmae_chan *sh_chan)
 {
 	/*
 	 * Default configuration for dual address memory-memory transfer.
-	 * 0x400 represents auto-request.
 	 */
-	u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
+	u32 chcr = DM_INC | SM_INC | RS_AUTO | log2size_to_chcr(sh_chan,
 						   LOG2_DEFAULT_XFER_SIZE);
 	sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
 	chcr_write(sh_chan, chcr);
diff --git a/include/linux/sh_dma.h b/include/linux/sh_dma.h
index b7b43b82231e0ae7fed55cae10c302ba4a04c105..56b97eed28a4ea819477065c8f6eda654dc32f55 100644
--- a/include/linux/sh_dma.h
+++ b/include/linux/sh_dma.h
@@ -95,19 +95,21 @@ struct sh_dmae_pdata {
 };
 
 /* DMAOR definitions */
-#define DMAOR_AE	0x00000004
+#define DMAOR_AE	0x00000004	/* Address Error Flag */
 #define DMAOR_NMIF	0x00000002
-#define DMAOR_DME	0x00000001
+#define DMAOR_DME	0x00000001	/* DMA Master Enable */
 
 /* Definitions for the SuperH DMAC */
-#define DM_INC	0x00004000
-#define DM_DEC	0x00008000
-#define DM_FIX	0x0000c000
-#define SM_INC	0x00001000
-#define SM_DEC	0x00002000
-#define SM_FIX	0x00003000
-#define CHCR_DE	0x00000001
-#define CHCR_TE	0x00000002
-#define CHCR_IE	0x00000004
+#define DM_INC	0x00004000	/* Destination addresses are incremented */
+#define DM_DEC	0x00008000	/* Destination addresses are decremented */
+#define DM_FIX	0x0000c000	/* Destination address is fixed */
+#define SM_INC	0x00001000	/* Source addresses are incremented */
+#define SM_DEC	0x00002000	/* Source addresses are decremented */
+#define SM_FIX	0x00003000	/* Source address is fixed */
+#define RS_AUTO	0x00000400	/* Auto Request */
+#define RS_ERS	0x00000800	/* DMA extended resource selector */
+#define CHCR_DE	0x00000001	/* DMA Enable */
+#define CHCR_TE	0x00000002	/* Transfer End Flag */
+#define CHCR_IE	0x00000004	/* Interrupt Enable */
 
 #endif