[PATCH] libata: interrupt driven pio for libata-core

- add PIO_ST_FIRST for the state before sending ATAPI CDB or sending
"ATA PIO data out" first data block.
- add ATA_TFLAG_POLLING and ATA_DFLAG_CDB_INTR flags
- remove the ATA_FLAG_NOINTR flag since the interrupt handler is now
aware of the states
- modify ata_pio_sector() and atapi_pio_bytes() to work in the interrupt
context
- modify the ata_host_intr() to handle PIO interrupts
- modify ata_qc_issue_prot() to initialize states
- atapi_packet_task() changed to handle "ATA PIO data out" first data block
- support the pre-ATA4 ATAPI device which raise interrupt when ready to
receive CDB

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index a5b74efab067..6fec2f6f2d59 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -181,6 +181,7 @@ enum {
         ATA_TFLAG_ISADDR        = (1 << 1), /* enable r/w to nsect/lba regs */
         ATA_TFLAG_DEVICE        = (1 << 2), /* enable r/w to device reg */
         ATA_TFLAG_WRITE         = (1 << 3), /* data dir: host->dev==1 (write) */
+        ATA_TFLAG_POLLING       = (1 << 4), /* set nIEN to 1 and use polling */
 };
 
 enum ata_tf_protocols {
@@ -250,6 +251,8 @@ struct ata_taskfile {
           ((u64) (id)[(n) + 1] << 16) | \
           ((u64) (id)[(n) + 0]) )
 
+#define ata_id_cdb_intr(id)     (((id)[0] & 0x60) == 0x20)
+
 static inline int atapi_cdb_len(u16 *dev_id)
 {
         u16 tmp = dev_id[0] & 0x3;