diff --git a/arch/mips/au1000/common/platform.c b/arch/mips/au1000/common/platform.c
index 841904cdef4d..39d681265297 100644
--- a/arch/mips/au1000/common/platform.c
+++ b/arch/mips/au1000/common/platform.c
@@ -189,7 +189,7 @@ static struct resource au1200_lcd_resources[] = {
 static struct resource au1200_ide0_resources[] = {
 	[0] = {
 		.start		= AU1XXX_ATA_PHYS_ADDR,
-		.end 		= AU1XXX_ATA_PHYS_ADDR + AU1XXX_ATA_PHYS_LEN,
+		.end 		= AU1XXX_ATA_PHYS_ADDR + AU1XXX_ATA_PHYS_LEN - 1,
 		.flags		= IORESOURCE_MEM,
 	},
 	[1] = {
diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index f84411b6609a..85c016bdfd38 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -586,13 +586,14 @@ static int au_ide_probe(struct device *dev)
 		goto out;
 	}
 
-	if (!request_mem_region (res->start, res->end-res->start, pdev->name)) {
+	if (!request_mem_region(res->start, res->end - res->start + 1,
+				pdev->name)) {
 		pr_debug("%s: request_mem_region failed\n", DRV_NAME);
 		ret =  -EBUSY;
 		goto out;
 	}
 
-	ahwif->regbase = (u32)ioremap(res->start, res->end-res->start);
+	ahwif->regbase = (u32)ioremap(res->start, res->end - res->start + 1);
 	if (ahwif->regbase == 0) {
 		ret = -ENOMEM;
 		goto out;
@@ -677,7 +678,7 @@ static int au_ide_remove(struct device *dev)
 	iounmap((void *)ahwif->regbase);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(res->start, res->end - res->start);
+	release_mem_region(res->start, res->end - res->start + 1);
 
 	return 0;
 }
diff --git a/include/asm-mips/mach-db1x00/db1200.h b/include/asm-mips/mach-db1x00/db1200.h
index a6bdac61ab49..d2e28e64932e 100644
--- a/include/asm-mips/mach-db1x00/db1200.h
+++ b/include/asm-mips/mach-db1x00/db1200.h
@@ -173,8 +173,8 @@ static BCSR * const bcsr = (BCSR *)BCSR_KSEG1_ADDR;
 #define AU1XXX_SMC91111_IRQ			DB1200_ETH_INT
 
 #define AU1XXX_ATA_PHYS_ADDR		(0x18800000)
-#define AU1XXX_ATA_PHYS_LEN			(0x100)
-#define AU1XXX_ATA_REG_OFFSET	(5)
+#define AU1XXX_ATA_REG_OFFSET		(5)
+#define AU1XXX_ATA_PHYS_LEN		(16 << AU1XXX_ATA_REG_OFFSET)
 #define AU1XXX_ATA_INT			DB1200_IDE_INT
 #define AU1XXX_ATA_DDMA_REQ		DSCR_CMD0_DMA_REQ1;
 #define AU1XXX_ATA_RQSIZE		128
diff --git a/include/asm-mips/mach-pb1x00/pb1200.h b/include/asm-mips/mach-pb1x00/pb1200.h
index 72213e3d02c7..edaa489b58f1 100644
--- a/include/asm-mips/mach-pb1x00/pb1200.h
+++ b/include/asm-mips/mach-pb1x00/pb1200.h
@@ -186,8 +186,8 @@ static BCSR * const bcsr = (BCSR *)BCSR_KSEG1_ADDR;
 #define AU1XXX_SMC91111_IRQ			PB1200_ETH_INT
 
 #define AU1XXX_ATA_PHYS_ADDR		(0x0C800000)
-#define AU1XXX_ATA_PHYS_LEN			(0x100)
-#define AU1XXX_ATA_REG_OFFSET	(5)
+#define AU1XXX_ATA_REG_OFFSET		(5)
+#define AU1XXX_ATA_PHYS_LEN		(16 << AU1XXX_ATA_REG_OFFSET)
 #define AU1XXX_ATA_INT			PB1200_IDE_INT
 #define AU1XXX_ATA_DDMA_REQ		DSCR_CMD0_DMA_REQ1;
 #define AU1XXX_ATA_RQSIZE		128