ide: add IDE_HFLAG_NO_{IO32_BIT,UNMASK_IRQS} host flags

* Use the same bit for IDE_HFLAG_CS5520 and IDE_HFLAG_VDMA host flags
  (both are used only by cs5520 host driver currently).

* Add IDE_HFLAG_NO_IO32_BIT host flag and use it instead of ->no_io_32bit
  ide_hwif_t field.

* Add IDE_HFLAG_NO_UNMASK_IRQS host flag, then convert dtc2278 and rz1000
  host drivers to use it.

There should be no functionality changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

include/linux/ide.h

@@ -607,7 +607,6 @@ typedef struct hwif_s {
 	unsigned	reset      : 1;	/* reset after probe */
 	unsigned	auto_poll  : 1; /* supports nop auto-poll */
 	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */
-	unsigned	no_io_32bit : 1; /* 1 = can not do 32-bit IO ops */
 	unsigned	mmio       : 1; /* host uses MMIO */
 
 	struct device	gendev;
@@ -1065,7 +1064,7 @@ enum {
 	IDE_HFLAG_NO_SET_MODE		= (1 << 9),
 	/* trust BIOS for programming chipset/device for DMA */
 	IDE_HFLAG_TRUST_BIOS_FOR_DMA	= (1 << 10),
-	/* host uses VDMA */
+	/* host uses VDMA (tied with IDE_HFLAG_CS5520 for now) */
 	IDE_HFLAG_VDMA			= (1 << 11),
 	/* ATAPI DMA is unsupported */
 	IDE_HFLAG_NO_ATAPI_DMA		= (1 << 12),
@@ -1075,8 +1074,10 @@ enum {
 	IDE_HFLAG_NO_DMA		= (1 << 14),
 	/* check if host is PCI IDE device before allowing DMA */
 	IDE_HFLAG_NO_AUTODMA		= (1 << 15),
+	/* don't autotune PIO */
+	IDE_HFLAG_NO_AUTOTUNE		= (1 << 16),
 	/* host is CS5510/CS5520 */
-	IDE_HFLAG_CS5520		= (1 << 16),
+	IDE_HFLAG_CS5520		= IDE_HFLAG_VDMA,
 	/* no LBA48 */
 	IDE_HFLAG_NO_LBA48		= (1 << 17),
 	/* no LBA48 DMA */
@@ -1102,8 +1103,10 @@ enum {
 	IDE_HFLAG_CLEAR_SIMPLEX		= (1 << 28),
 	/* DSC overlap is unsupported */
 	IDE_HFLAG_NO_DSC		= (1 << 29),
-	/* don't autotune PIO */
-	IDE_HFLAG_NO_AUTOTUNE		= (1 << 30),
+	/* never use 32-bit I/O ops */
+	IDE_HFLAG_NO_IO_32BIT		= (1 << 30),
+	/* never unmask IRQs */
+	IDE_HFLAG_NO_UNMASK_IRQS	= (1 << 31),
 };
 
 #ifdef CONFIG_BLK_DEV_OFFBOARD