ide: add PIO masks

* Add ATA_PIO[0-6] defines to <linux/ata.h>.

* Add ->pio_mask field to ide_pci_device_t and ide_hwif_t.

* Add PIO masks to host drivers.

<linux/ata.h> change ACK-ed by Jeff Garzik <jeff@garzik.org>.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index b107ee3..581316f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -503,6 +503,7 @@
 		.bootable	= ON_BOARD,
 		.host_flags	= IDE_HFLAG_PIO_NO_BLACKLIST
 				| IDE_HFLAG_PIO_NO_DOWNGRADE,
+		.pio_mask	= ATA_PIO5,
 	},{	/* 1 */
 		.name		= "VP_IDE",
 		.init_chipset	= init_chipset_via82cxxx,
@@ -512,6 +513,7 @@
 		.bootable	= ON_BOARD,
 		.host_flags	= IDE_HFLAG_PIO_NO_BLACKLIST
 				| IDE_HFLAG_PIO_NO_DOWNGRADE,
+		.pio_mask	= ATA_PIO5,
 	}
 };