[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>
diff --git a/include/linux/ata.h b/include/linux/ata.h
index a5b74ef..6fec2f6 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -181,6 +181,7 @@
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 @@
((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;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index bb2d916..9ac2b69 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -97,6 +97,7 @@
ATA_DFLAG_LBA48 = (1 << 0), /* device supports LBA48 */
ATA_DFLAG_PIO = (1 << 1), /* device currently in PIO mode */
ATA_DFLAG_LOCK_SECTORS = (1 << 2), /* don't adjust max_sectors */
+ ATA_DFLAG_CDB_INTR = (1 << 3), /* device asserts INTRQ when ready for CDB */
ATA_DEV_UNKNOWN = 0, /* unknown device */
ATA_DEV_ATA = 1, /* ATA device */
@@ -115,8 +116,6 @@
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_NOINTR = (1 << 9), /* FIXME: Remove this once
- * proper HSM is in place. */
ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
@@ -165,6 +164,7 @@
HSM_ST_LAST,
HSM_ST_LAST_POLL,
HSM_ST_ERR,
+ HSM_ST_FIRST,
};
/* forward declarations */