Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a
system wakeup source via olpc-xo1-pm.

Device detection is based on finding the relevant device tree node.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

EC events indicate change in AC power connectivity, battery state of
charge, battery error, battery presence, etc. Send notifications to
the power supply subsystem when changes are detected.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-10-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Configure the XO-1's lid switch GPIO to trigger an SCI interrupt,
and correctly expose this input device which can be used as a wakeup
source.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-9-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

The EC in the OLPC XO-1 delivers GPE events to provide various
notifications. Add the basic code for GPE/EC event processing and
enable the ebook switch, which can be used as a wakeup source.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-8-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Update the EC SCI masks with recent additions.

Add functions to query SCI events and set the wakeup mask, to be used by
followup patches.

Add functions to tweak an event mask used to select certain EC events as
a system wakeup source. Also add a function to determine if EC wakeup
functionality is available, as this depends on child drivers (different
for each laptop model) to configure the SCI interrupt.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-7-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

The System Control Interrupt is used in the OLPC XO-1 to control various
features of the laptop. Add the driver base and the power button
functionality.

This driver can't be built as a module, because functionality added in
future patches means that some drivers need to know at boot-time whether
SCI-based functionality is available.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-6-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Add code needed for basic suspend/resume of the XO-1 laptop.
Based on earlier work by Jordan Crouse, Andres Salomon, and others.

This patch incorporates all earlier feedback from Thomas Gleixner. To
clarify a certain point (now more obvious in the code itself):
On resume, OpenFirmware returns execution to Linux in protected mode
with a kernel-compatible GDT already set up. The changes and
simplifications suggested have all been included.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-5-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Based on earlier review comments, we'll no longer try to stick all of
our XO-1 goodies in a single driver. We'll split it into a power management
driver, and an EC/SCI driver.

As a first step, rename olpc-xo1 to olpc-xo1-pm, and make it builtin
instead of modular.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-4-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Move these definitions into the relevant header file.
This was requested in the review of the upcoming XO-1 suspend/resume code.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-3-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

In response to new device tree code in the kernel, OLPC will start
using it for probing of certain devices. However, some firmware fixes
are needed to put the devicetree into a usable state.

Retain compatibility with old firmware by fixing up the device tree
at boot-time if it does not contain the new nodes/properties that
we need for probing. This is the same approach taken on PPC platforms.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-2-git-send-email-dsd@laptop.orgAcked-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NAndres Salomon <dilinger@queued.net>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

The cs5535-pms cell doesn't actually need to be cloned, so we can drop that
and simply have the olpc-xo1.c driver use "cs5535-pms" directly.

Also, rename the cs5535-acpi clones to what we actually use for the (currently
out-of-tree) SCI driver.  In the process, that fixes a subtle bug in
olpc-xo1.c which broke powerdown on XO-1s.. olpc-xo1-ac-acpi was a typo, not
something that actually existed.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Replace mfd_shared_platform_driver_register with mfd_clone_cell.  The
former was called by an mfd client, and registered both a platform driver
and device.  The latter is called by an mfd driver, and registers only a
platform device.

The downside of this is that mfd drivers need to be modified whenever
new clients are added that share a cell; the upside is that it fits
Linux's driver model better.  It's also simpler.

This also converts cs5535-mfd/olpc-xo1 from the old API.  cs5535-mfd
now creates the olpc-xo1-{acpi,pms} devices, while olpc-xo1 binds to
them via platform drivers.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

As requested by Samuel, there's not really any reason to have "shared"
in the name.

This also modifies the only user of the function, as well.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This enables sharing of cs5535-mfd cells via the new mfd_shared_* API.
Hooks for enable/disble of resources are added, with refcounting of
resources being automatically handled so that cs5535_mfd_res_enable/disable
are only called when necessary.

Clients of cs5535-mfd (in this case, olpc-xo1.c) are also modified to
use the mfd_shared API.  The platform drivers are also renamed to
olpc-xo1-{pms,acpi}, and resource enabling/disabling is replaced
with mfd_shared API calls.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Make OLPC fully depend on device tree, and use it to identify the OLPC
platform details. Some nodes are exposed as platform devices where we
plan to use device tree for device probing.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
LKML-Reference: <20110313151017.C255F9D401E@zog.reactivated.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

..similar to what sparc's prom_early_alloc does.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

OLPC_OPENFIRMWARE_DT is just there to be selected by OLPC and selects
OF_PROMTREE. So let OLPC select OF_PROMTREE and remove that extra
config indirection. Fixup code and Makefile and use CONFIG_OF_PROMTREE
instead.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Andres Salomon <dilinger@queued.net>

Neither CONFIG_OLPC_OPENFIRMWARE nor CONFIG_OLPC_OPENFIRMWARE_DT are
really necessary.

OLPC selects OLPC_OPENFIRMWARE unconditionally, so move the "select
OF" part under OLPC config option and fixup the dependencies in
Makefiles and code.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Andres Salomon <dilinger@queued.net>

The cs5535-mfd driver now takes care of the PCI BAR handling; this
means the olpc-xo1 driver shouldn't be touching the PCI device at all.

This patch uses both cs5535-acpi and cs5535-pms platform devices rather
than a single platform device because the cs5535-mfd driver may be used
by other CS5535 platform-specific drivers; OLPC doesn't get to dictate
that ACPI and PMS will always be used together.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Calling alloc_bootmem() for tiny chunks of memory over and over is really
slow; on an XO-1, it caused the time between when the kernel started
booting and when the display came alive (post-lxfb probe) to increase
to 44s.  This patch optimizes the prom_early_alloc function by
calling alloc_bootmem for 4k-sized blocks of memory, and handing out
chunks of that to callers.  With this patch, the time between kernel load
and display initialization decreased to 23s.  If there's a better way to
do this early in the boot process, please let me know.

(Note: increasing the chunk size to 16k didn't noticably affect boot time,
and wasted 9k.)

v4: clarify comment, requested by hpa
v3: fix wasted memory buglet found by Milton Miller, and style fix.
v2: reorder prom_early_alloc as suggested by Grant.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
LKML-Reference: <20101129153951.74202a84@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Make use of PROC_DEVICETREE to export the tree, and sparc's PROMTREE code to
call into OLPC's Open Firmware to build the tree.

v5: fix buglet with root node check (introduced in v4)

v4: address some minor style issues pointed out by Grant, and explicitly cast
    negative phandle checks to s32.

v3: rename olpc_prom to olpc_dt
  - rework Kconfig entries
  - drop devtree build hook from proc, instead adding a call to x86's
    paging_init (similarly to how sparc64 does it)
  - switch allocation from using slab to alloc_bootmem.  this allows
    the DT to be built earlier during boot (during setup_arch); the
    downside is that there are some 1200 bootmem reservations that are
    done during boot.  Not ideal..
  - add a helper olpc_ofw_is_installed function to test for the
    existence and successful detection of OLPC's OFW.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
LKML-Reference: <20101116220952.26526a80@queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Andres Salomon <dilinger@queued.net>