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/include/linux/ide.h b/include/linux/ide.h
index 9f72f6e..5f5daad 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -683,6 +683,8 @@
 
 	u8 host_flags;
 
+	u8 pio_mask;
+
 	u8 atapi_dma;	/* host supports atapi_dma */
 	u8 ultra_mask;
 	u8 mwdma_mask;
@@ -1270,6 +1272,7 @@
 	unsigned int		extra;
 	struct ide_pci_device_s	*next;
 	u8			host_flags;
+	u8			pio_mask;
 	u8			udma_mask;
 } ide_pci_device_t;