[PATCH] libata: interrupt driven pio for LLD

libata.h:
libata-core:
  Add ATA_FLAG_PIO_POLLING flag for LLDs that expect interrupt for
command completion only.

sata_nv.c:
sata_vsc.c:
  irq handler is wrapper around ata_host_intr(), can handle PIO interrupts.

sata_promise.c:
sata_sx4.c:
sata_qstor.c:
sata_mv.c:
  Private irq handler.
  Polling mode ATA_FLAG_PIO_POLLING used for compatibility.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9ac2b69df3c1..ea8ab29aa92e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -116,6 +116,8 @@ enum {
         ATA_FLAG_MMIO           = (1 << 6), /* use MMIO, not PIO */
         ATA_FLAG_SATA_RESET     = (1 << 7), /* use COMRESET */
         ATA_FLAG_PIO_DMA        = (1 << 8), /* PIO cmds via DMA */
+        ATA_FLAG_PIO_POLLING    = (1 << 9), /* use polling PIO if LLD
+                                             * doesn't handle PIO interrupts */
 
         ATA_QCFLAG_ACTIVE       = (1 << 1), /* cmd not yet ack'd to scsi lyer */
         ATA_QCFLAG_SG           = (1 << 3), /* have s/g table? */