This patch adds support for Freescale 3.0Gbps SATA Controller supporting
Native Command Queueing(NCQ), device hotplug, and ATAPI.  This controller
can be found on MPC8315 and MPC8378.
Signed-off-by: NAshish Kalra <ashish.kalra@freescale.com>
Signed-off-by: NLi Yang <leoli@freescale.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

There are configurations where CONFIG_ACPI but !CONFIG_PM.  In this
case, pata_acpi can be selected but won't build.  Fix it.

Reported by Avuton Olrich.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Avuton Olrich <avuton@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

LIBATA_MAX_PRD is the maximum number of DMA scatter/gather elements
permitted by the HBA's DMA engine. It's properly set to
q->max_hw_segments via the sg_tablesize parameter.

libata shouldn't call blk_queue_max_phys_segments. Now LIBATA_MAX_PRD
is equal to SCSI_MAX_PHYS_SEGMENTS by default (both is 128), so
everything is fine. But if they are changed, some code (like the scsi
mid layer, sg chaining, etc) might not work properly.

(Addition from Jens) The basic issue is that the physical segment
setting is purely a driver issue. And since SCSI is managing the sglist,
libata has no business changing the setting. All libata should care
about is the hw segment setting.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

This converts libata to using the sg helpers for looking up sg
elements, instead of doing it manually.
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

Fix libata docbook warnings.

Warning(linux-2.6.23-git8//drivers/ata/libata-scsi.c:3251): No description found for parameter 'dev'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This driver was using hooks that were very recently removed.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

Signed-off-by: NKristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

The strn_pattern_cmp routine does not handle a blank name parameter
properly. The only patterns which should match a blank name are "*"
and an explicit "". If the function is passed a blank name in current
code, it will always match against the patt parameter. The bug manifests
itself as the device with the empty model name always matching the first
device in the DMA blacklist, forcing it to revert to PIO mode.
Signed-off-by: NAndrew Paprocki <andrew@ishiboo.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

This patch adds a port map for ICH9 and ICH8 SATA controllers that have only 2 ports available in that mode.
Signed-off-by: NJason Gaston <jason.d.gaston@intel.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This is a driver for the ATA controller on the Geode CS5536 companion
chip.  The PCI device ID for this device was previously claimed by
pata_amd.c but the PIO timings were not correct.  This driver also
works around a bug in some BIOSes that handle unaligned access to the
PCI config registers poorly.  Finally, the driver allows fallback to
using MSR registers for configuration on BIOSes that are truly
broken.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ST9160821AS / 3.CCD does spurious completions too.  Blacklist it.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

After commands which can change device configuration, EH is scheduled
to revalidate and reconfigure the device.  Host link was incorrectly
used unconditionally when scheduling EH action.  This resulted in
bogus revalidation request and mismatched configuration between device
and driver.  Fix it.

This bug was reported by Igor Durdanovic.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Igor Durdanovic <idurdanovic@comcast.net>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Add the Software NCQ support to sata_nv.c for MCP51/MCP55/MCP61 SATA
controller.  NCQ function is disable by default, you can enable it
with 'swncq=1'.  NCQ will be turned off if the drive is Maxtor on
MCP51 or MCP55 rev 0xa2 platform.

[akpm@linux-foundation.org: build fix]
Signed-off-by: NKuan Luo <kluo@nvidia.com>
Signed-off-by: NPeer Chen <pchen@nvidia.com>
Cc: Zoltan Boszormenyi <zboszor@dunaweb.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

This patch adds MMIO support to the pata_sil680 for taskfile IOs,
based on what the old siimage does.

I haven't bothered changing the chip setup stuff from PCI config
cycles to MMIO though (siimage does it), I don't think it matters,
I've only adapted it to use MMIO for taskfile accesses.

I've tested it on a Cell blade and it seems to work fine.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Trivial unused variable fix
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* remove pointless pci_dev_to_dev() wrapper.  Just directly reference
  the embedded struct device like everyone else does.

* pata_cs5520: delete cs5520_remove_one(), it was a duplicate of
  ata_pci_remove_one()

* linux/libata.h: don't bother including linux/pci.h, we don't need it.
  Simply declare 'struct pci_dev' and assume interested parties will
  include the header, as they should be doing anyway.

* linux/libata.h: consolidate all CONFIG_PCI declarations into a
  single location in the header.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

PMP registers used to be accessed with dedicated accessors ->pmp_read
and ->pmp_write.  During reset, those callbacks are called with the
port frozen so they should be able to run without depending on
interrupt delivery.  To achieve this, they were implemented polling.

However, as resetting the host port makes the PMP to isolate fan-out
ports until SError.X is cleared, resetting fan-out ports while port is
frozen doesn't buy much additional safety.

This patch updates libata PMP support such that PMP registers are
accessed using regular ata_exec_internal() mechanism and kills
->pmp_read/write() callbacks.  The following changes are made.

* PMP access helpers - sata_pmp_read_init_tf(), sata_pmp_read_val(),
  sata_pmp_write_init_tf() are folded into sata_pmp_read/write() which
  are now standalone PMP register access functions.

* sata_pmp_read/write() returns err_mask instead of rc.  This is
  consistent with other functions which issue internal commands and
  allows more detailed error reporting.

* ahci interrupt handler is modified to ignore BAD_PMP and
  spurious/illegal completion IRQs while reset is in progress.  These
  conditions are expected during reset.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Implement ATA_PFLAG_RESETTING.  This flag is set while reset is in
progress.  It's set before prereset is called and cleared after reset
fails or postreset is finished.

This flag itself doesn't have any function.  It will be used by LLDs
to tell whether reset is in progress if it needs to behave differently
during reset.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Add @timeout argument to ata_exec_internal[_sg]().  If 0, default
timeout ata_probe_timeout is used.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Asynchronous notification on ICH9 didn't work because it didn't write
AN FIS into the RX area - it only updates SNotification.  Also,
snooping SDB_FIS RX area is racy against further SDB FIS receptions.
Let sata_async_notification() determine using SNTF if it's available
and snoop RX area iff SNTF isn't available
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Now that we have pp->intr_mask, move PORT_IRQ_BAD_PMP enabling to
ahci_pmp_attach/detach() where it belongs.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ahci had problems with NCQ over PMP and NCQ used to be disabled while
PMP was attached.  After fixing the problem, the temporary NCQ
disabling code wasn't removed completely.  Kill the remaining piece.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Tasks in uninterruptible sleep might be woken up by unrelated events
and should check whether the condition it was waiting for has actually
triggered.  Wrap schedule_timeout_uninterruptible() in loop to achieve
it.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ATA_EHI_NO_AUTOPSY and ATA_EHI_QUIET are used during initial probing
to skip exception analysis and reporting.  Usually, there's nothing to
report but on some allowed but rare corner cases (e.g. phy status
changed interrupt when IRQ is enabled on frozen port - this happens if
IRQ pending status isn't cleared in the IRQ router or controller)
exception messages get printed.

Skip reporting if ATA_EHI_QUIET is set.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ehi description field is used to carry LLD specific controller
description.  Sometimes, it's used without clearing before and LLD
description gets printed with exception information one more time.
Clear after printing.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

PATA part of all current JMB controllers behave the same way and
JMicron confirms that all future ones will stay compatible.  Drop
device matching and match only vendor and class.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Ethan Hsiao <ethanhsiao@jmicron.com>
Cc: Justin Tsai <justin@jmicron.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ST9160821AS / 3.ALD also does spurious NCQ completions.  Disable NCQ.
Signed-off-by: NTejun Heo <teheo@suse.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

	On a cable there may be
	eighty wires or perhaps forty
	and we learn about its type
	In the world of ACPI

	So we call the GTM
	And we find the the timing rate
	And we look through it to see
	If eighty wire it must be

	Timing lives in ACPI routines
	ACPI routines, ACPI routines
	Timing lives in ACPI routines
	ACPI routes ACPI routines

	And the drivers last you see
	Picking up unknown pci ids
	and the code begins to work

	Timing lives in ACPI routines
	ACPI routines, ACPI routines
	Timing lives in ACPI routines
	ACPI routes ACPI routines

	[Full speed ahead, Mr Hacker, full speed ahead]
	 Full speed over here sir!
	 Checking Cable, checking cable
	 Aye aye, 80 wire,
	 Heaven heaven]

	If we use ACPI (ACPI)
	Every box (every box) has all we need (has all we need)
	Cable type (cable type) and mode timing (mode timing)
	In our ATA (in our ATA) subroutines (subroutines, ha ha)

	Timing lives in ACPI routines
	ACPI routines, ACPI routines
	Timing lives in ACPI routines
	ACPI routes ACPI routines
	Timing lives in ACPI routines
	ACPI routines, ACPI routines
	Timing lives in ACPI routines
	ACPI routes ACPI routines
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Talk to the dark side our driver has to, yes. Much misleading is the
data. Store it in a structure we do so that it may be parsed.
Signed-off-by: NAlan Cox <alan@redhat.com>
--
Whats small, old and shouts phrases out of order across mountains ?
Yodla..
Signed-off-by: NJeff Garzik <jeff@garzik.org>

HDT722516DLA380 does spurious completion of NCQ commands.  Blacklist
it.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Frans Pop <elendil@planet.nl>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Seagate Barracuda ST380817AS has troubles with NCQ. For example,
unpacking a tarball on an XFS filesystem gives this:

ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x2 frozen
ata1.00: cmd 61/40:00:29:a3:98/00:00:00:00:00/40 tag 0 cdb 0x0 data 32768 out
         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)

More info here:
http://lkml.org/lkml/2007/1/21/76

Blacklist it!
Signed-off-by: NPaolo Ornati <ornati@fastwebnet.it>
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Let's see what explodes.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

Some controller variants snoop the ATAPI length value for Packet
transfers to do state machine and FIFO management. Thus we want to
set it properly, even for cases where it is otherwise meaningless.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Correct handling of SRST reset sequences.  After an SRST it is undefined
whether the drive has gone back to PIO0.  In order to talk safely we should
talk slowly and carefully until we know.

Thus when we do the reset if the controller has a pio setup method we call it
to flip back to PIO 0 and a known state.  After the reset completes the
identify will then be done at the safe speed and the drive/controller will
pick suitable faster modes and reconfigure the controller to these timings.

As a side effect it means we force the controller to PIO 0 as we bring it up
which fixes funnies on a few systems where the BIOS firmware leaves us in an
interesting choice of modes, or embedded boxes with no firmware which come up
in random states.

For smart controllers there is nothing to do - they know about this
internally.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Modern laptops with hotswap bays still tend to utilise a PATA interface
on a SATA bridge, generally with the host controller in some legacy
emulation mode rather than AHCI. This means that the existing hotplug
code in libata is unable to work. The ACPI specification states that
these devices can send notifications when hotswapped, which avoids the
need to obtain notification from the controller. This patch uses the
existing libata-acpi code and simply registers a notification in order
to trigger a rescan whenever the firmware signals an event.
Signed-off-by: NMatthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This is useful when debugging, handling problem systems, or for
distributions just to get the system installed so it can be sorted
out later.

This is a bit smarter than the old IDE one and lets you do

libata.dma=0	Disable all PATA DMA like old IDE
libata.dma=1	Disk DMA only
libata.dma=2	ATAPI DMA only
libata.dma=4	CF DMA only

(or combinations thereof - 0,1,3 being the useful ones I suspect)

(I've split CF as it seems to be a seperate case of pain and suffering
different to the others and caused by assorted PIO wired adapters etc)
Signed-off-by: NAlan Cox <alan@redhat.com>

[edited to work on SATA too, changing name from 'pata_dma' to 'dma']
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

Signed-off-by: NPeer Chen <peerchen@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This adds human-readable decoding of the ATA status and error registers
(similar to what drivers/ide does) as well as the SATA Serror register
to libata error handling output.  This prevents the need to pore
through standards documents to figure out the meaning of the bits
in these registers when looking at error reports.  Some bits that
drivers/ide decoded are not decoded here, since the bits are either
command-dependent or obsolete, and properly parsing them would add
too much complexity.
Signed-off-by: NRobert Hancock <hancockr@shaw.ca>

[edited slightly to make output a bit more symmetric]
Signed-off-by: NJeff Garzik <jeff@garzik.org>