- add is_multi_taskfile() to ata.h
   - initialize ata_device->multi_count with device identify data
   - use ata_pio_sectors() to support r/w multiple commands
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

========
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

   - change the return value of ata_pio_complete() 0 <-> 1
   - add return value for ata_pio_first_block()
   - rename variable "qc_completed" to "has_next" in ata_pio_task()
   - use has_next to eliminate unnecessary queuing in ata_pio_first_block()
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

==========
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

   - remove ap->dataout_task from struct ata_port
   - let ata_pio_task() handle the HSM_ST_FIRST state.
   - rename ata_dataout_task() to ata_pio_first_block()
   - replace the ata_dataout_task workqueue with ata_pio_task workqueue
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

========
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

   - ata_pio_block(): add ata_altstatus(ap) to prevent reading device status before it is valid
   - remove the unnecessary HSM_ST_IDLE state from ata_pio_task()
   - raise BUG() when unknown state is found in ata_pio_task()
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Fix all reported kernel-doc errors in libata.
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Use ata_pad_{alloc,free} in two drivers, to factor out common code.

Add ata_pad_{alloc,free} to two other drivers, which needed the padding
but had not been updated.

A lot of power packed into a little patch.

This change eliminates the sharing between our controller-wide spinlock
and the SCSI core's Scsi_Host lock.  As the locking in libata was
already highly compartmentalized, always referencing our own lock, and
never scsi_host::host_lock.

As a side effect, this change eliminates a deadlock from calling
scsi_finish_command() while inside our spinlock.

Integrate ata_exec() and ata_tf_to_host() into their only caller,
ata_bus_edd().

Rename ata_tf_to_host_nolock() to ata_tf_to_host().

This makes locking a bit easier to review, and may help pave the way for
future changes.

ata_pci_init_one() receives an array of struct ata_port_info.  Recent
updates to the code had always obtained port information from
array element 0, rather than array element N.

Change to avoid hardcoding port_info[0], thereby restoring proper
hardware information to secondary legacy ports.

The second argument to ata_qc_complete() was being used for two
purposes: communicate the ATA Status register to the completion
function, and indicate an error.  On legacy PCI IDE hardware, the latter
is often implicit in the former.  On more modern hardware, the driver
often completely emulated a Status register value, passing ATA_ERR as an
indication that something went wrong.

Now that previous code changes have eliminated the need to use drv_stat
arg to communicate the ATA Status register value, we can convert it to a
mask of possible error classes.

This will lead to more flexible error handling in the future.

We now depend on ->tf_read() to provide us with the contents
of the Error shadow register.

This patch uses sg_set_buf/sg_init_one in some places where it was
duplicated.
Signed-off-by: NDavid Hardeman <david@2gen.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Greg KH <greg@kroah.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

libata-core cleanups:
- use kzalloc() instead of kmalloc() + memset();
- use one exit path in ata_device_add();
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

We want ->tf_read() to get a complete snapshot of all taskfile
registers, without requiring the callers to manually call
ata_chk_status() and ata_chk_err() themselves.

This also fixes a minor bug in sata_vsc where the lower bits of the
feature register were incorrectly placed in the HOB (high order bits)
portion of struct ata_taskfile.

Correct some function names in kernel-doc.
Add some kernel-doc descriptions.
Fix some typos.
Remove a few blank lines.
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Enforce access rules where appropriate.

If the compiler is smart enough, this may buy us an optimization or two
as a side effect.

This is needed for full AMD and VIA drivers and possibly more. Functions
to turn actual clocking and cycle timings into register values. Also to
merge shared timings to compute an optimal timing set.

Built from the drivers/ide version by Vojtech Pavlik
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

problem:
      id[53-58] might be changed after initializing device CHS settings.

changes:
    - call ata_dev_reread_id() to reread the identify device info,
      after initializing device CHS settings.
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

     - merge ata_prot_to_cmd() and ata_dev_set_protocol() as
       ata_rwcmd_protocol()
     - pave road for read/write multiple support
     - remove usage of pre-cached command and protocol values and call
       ata_rwcmd_protocol() instead
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

==============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

   move the initialization of taskfile LBA flags
     "ATA_TFLAG_LBA" and "ATA_TFLAG_LBA48 flags"
   to the SCSI translation functions
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

=============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

as done in ide-scsi.c
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

and __atapi_pio_bytes()

   - relocate DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ?
			"write" : "read");
   - buf + offset, buf - offset tidy up
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

   - move some code out of the kmap_atomic() / kunmap_atomic() zone
   - remove the redundant "do_write = (qc->tf.flags & ATA_TFLAG_WRITE);"
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

A few code shuffles, to make merging future code easier.

Add (DRIVER_SENSE << 24) to certain result codes, as noted by Douglas
Gilbert.

No content changes, just moving code around.

ATAPI needs to be padded to next 4 byte boundary, if misaligned.

Original work by me, many fixes from Tejun Heo.

This redoes the n_ports logic I proposed before as a bitmask.
ata_pci_init_native_mode is now used with a mask allowing for mixed mode
stuff later on. ata_pci_init_legacy_port is called with port number and
does one port now not two. Instead it is called twice by the ata init
logic which cleans both of them up.

There are stil limits in the original code left over

- IRQ/port mapping for legacy mode should be arch specific values
- You can have one legacy mode IDE adapter per PCI root bridge on some systems
- Doesn't handle mixed mode devices yet (but is now a lot closer to it)

to be near ata_pio_*() functions

Replace SCSI's legacy "bang at the door" method of probing with one
directly controlled by the underlying ATA transport layer.

We now only call scsi_scan_target() for devices we find, rather than
probing every possible channel/id within a certain range.

ata_qc_issue_prot():
    - cleanup and let the PIO data out case always go through the
ata_dataout_task() codepath.
      (Previously for PIO data out case, 2 code pathes were used
        - irq case goes through ata_data_out_task() codepath.
        - polling case jumps over the HSM_ST_FIRST state and goes to
HSM_ST and ata_pio_task() directly.)

  ata_dataout_task():
    - rearrange the queue_work() code to handle the PIO data out +
polling case.
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

- Use if (qc->tf.protocol == ATA_PROT_PIO) instead of
if(is_atapi_taskfile()) in ata_dataout_task()
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

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

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

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