diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 9412de3..6a21cd8 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -70,12 +70,22 @@
 
 static u16 dmaor_read(struct sh_dmae_device *shdev)
 {
-	return __raw_readw(shdev->chan_reg + DMAOR / sizeof(u32));
+	u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+
+	if (shdev->pdata->dmaor_is_32bit)
+		return __raw_readl(addr);
+	else
+		return __raw_readw(addr);
 }
 
 static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
 {
-	__raw_writew(data, shdev->chan_reg + DMAOR / sizeof(u32));
+	u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+
+	if (shdev->pdata->dmaor_is_32bit)
+		__raw_writel(data, addr);
+	else
+		__raw_writew(data, addr);
 }
 
 static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
diff --git a/include/linux/sh_dma.h b/include/linux/sh_dma.h
index 96803aa..f25afc6 100644
--- a/include/linux/sh_dma.h
+++ b/include/linux/sh_dma.h
@@ -64,6 +64,8 @@
 	u16 dmaor_init;
 	unsigned int chcr_offset;
 	u32 chcr_ie_bit;
+
+	unsigned int dmaor_is_32bit:1;
 };
 
 /* DMA register */