Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  The advantage
in doing so is that module.h itself sources about 15 other headers;
adding significantly to what we feed cpp, and it can obscure what
headers we are effectively using.

Since module.h was the source for init.h (for __init) and for
export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance
for the presence of either and replace as needed.

One module.h was converted to moduleparam.h since the file had
multiple module_param() in it, and another file had an instance of
MODULE_DEVICE_TABLE deleted, since that is a no-op when builtin.

Finally, the 32 bit build coverage of olpc_ofw revealed a couple
implicit includes, which were pretty self evident to fix based on
what gcc was complaining about.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160714001901.31603-6-paul.gortmaker@windriver.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

The new EC driver calls platform-specific suspend and resume hooks; run
XO-1-specific EC commands from there, rather than deep in s/r code.  If we
attempt to run EC commands after the new EC driver has suspended, it is
refused by the ec->suspended checks.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NPaul Fox <pgf@laptop.org>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

There's nothing about the debugfs interface for the EC driver that is
architecture-specific, so move it into the arch-independent driver.

The code is mostly unchanged with the exception of renamed variables, coding
style changes, and API updates.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NPaul Fox <pgf@laptop.org>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

This uses the new EC driver framework in drivers/platform/olpc.  The
XO-1 and XO-1.5-specific code is still in arch/x86, but the generic stuff
(including a new workqueue; no more running EC commands with IRQs disabled!)
can be shared with other architectures.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NPaul Fox <pgf@laptop.org>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

Switch over to using olpc-ec.h in multiple steps, so as not to break builds.
This covers every driver that calls olpc_ec_cmd().
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NPaul Fox <pgf@laptop.org>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

The OLPC EC driver has outgrown arch/x86/platform/.  It's time to both
share common code amongst different architectures, as well as move it out
of arch/x86/.  The XO-1.75 is ARM-based, and the EC driver shares a lot of
code with the x86 code.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NPaul Fox <pgf@laptop.org>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

Add a debugfs interface for sending commands to the OLPC
Embedded Controller (EC) and reading the responses.  The EC
provides functionality for machine identification, battery and
AC control, wakeup control, etc.

Having a debugfs interface available is useful for EC
development and debugging.

Based on code by Paul Fox (who also approves of the end result).
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Acked-by: NPaul Fox <pgf@laptop.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andres Salomon <dilinger@queued.net>
Link: http://lkml.kernel.org/r/20120327150740.667D09D401E@zog.reactivated.netSigned-off-by: NIngo Molnar <mingo@kernel.org>

When executing EC commands, only waiting when there are still
more bytes to write is usually fine. However, if the system
suspends very quickly after a call to olpc_ec_cmd(), the last
data byte may not yet be transferred to the EC, and the command
will not complete.

This solves a bug where the SCI wakeup mask was not correctly
written when going into suspend.

It means that sometimes, on XO-1.5 (but not XO-1), the
devices that were marked as wakeup sources can't wake up
the system. e.g. you ask for wifi wakeups, suspend, but then
incoming wifi frames don't wake up the system as they should.
Signed-off-by: NPaul Fox <pgf@laptop.org>
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Acked-by: NAndres Salomon <dilinger@queued.net>
Cc: <stable@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Add a driver for the ACPI-based EC event interface found on the
OLPC XO-1.5 laptop. This enables notification of battery/AC power events,
and enables various devices to be used as wakeup sources through regular
ACPI mechanisms.

This driver can't be built as a module, because some drivers need to know
at boot-time if SCI-based functionality is available via
olpc_ec_wakeup_available().
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-12-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>

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>

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

This configuration type override is for XO-1 only and must not happen
on XO-1.5.
Acked-by: NAndres Salomon <dilinger@queued.net>
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

The upcoming XO-1 rfkill driver (for drivers/platform/x86) will register
itself with the name "xo1-rfkill", and the already-merged XO-1 poweroff
code uses name "olpc-xo1"

Add the necessary mechanics so that these devices are properly
initialized on XO-1 laptops.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
LKML-Reference: <20101013181042.90C8F9D401B@zog.reactivated.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Avoids a potential infinite loop.

It was observed once, during an EC hacking/debugging
session - not in regular operation.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Cc: dilinger@queued.net
Cc: <stable@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

The XO-1.5 laptop is not currently detected as an OLPC machine because
it fails this XO-1-centric check.

Now that we have OLPC OFW support in the kernel, a more sensible
check is to see if we found OFW during boot and check the architecture
property.

Also remove a now-meaningless codepath, as we're always going to have
OFW support with OLPC.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
LKML-Reference: <20100923162846.D8D409D401B@zog.reactivated.net>
Cc: Andres Salomon <dilinger@queued.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

This configuration type override is for XO-1 only and must not happen
on XO-1.5.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
LKML-Reference: <20100923162805.0F6549D401B@zog.reactivated.net>
Cc: Andres Solomon <dilinger@queued.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

The arguments passed to OFW shouldn't be modified; update the 'args'
argument of olpc_ofw to reflect this.  This saves us some later
casting away of consts.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
LKML-Reference: <20100628220029.1555ac24@debian>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Unconditionally printing EC debug messages was helpful when we were actually
debugging the EC, but during normal operation it can get pretty annoying.
Using pr_debug allows us finer-grained control.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
LKML-Reference: <20100616231928.16b539f0@dev.queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Add support for saving OFW's cif, and later calling into it to run OFW
commands.  OFW remains resident in memory, living within virtual range
0xff800000 - 0xffc00000.  A single page directory entry points to the
pgdir that OFW actually uses, so rather than saving the entire page
table, we grab and install that one entry permanently in the kernel's
page table.

This is currently only used by the OLPC XO.  Note that this particular
calling convention breaks PAE and PAT, and so cannot be used on newer
x86 hardware.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
LKML-Reference: <20100618174653.7755a39a@dev.queued.net>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Replace the #ifdef'ed OLPC-specific init functions by a conditional
x86_init function.  If the function returns 0 we leave pci_arch_init,
otherwise we continue.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Andres Salomon <dilinger@collabora.co.uk>
LKML-Reference: <43F901BD926A4E43B106BF17856F0755A318CE89@orsmsx508.amr.corp.intel.com>
Signed-off-by: NJacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Signed-off-by: NAndres Salomon <dilinger@collabora.co.uk>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Chris Ball <cjb@laptop.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Impact: fix "garbled display, laptop is unusable" bug

Commit e51a1ac2 ("x86, olpc: fix endian
bug in openfirmware workaround") breaks model comparison on OLPC; the value
0xc2 needs to be scaled up by olpc_board().

The pre-patch version was wrong, but accidentally worked anyway
(big-endian 0xc2 is big enough to satisfy all other board revisions,
but little endian 0xc2 is not).
Signed-off-by: NChris Ball <cjb@laptop.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: NAndres Salomon <dilinger@queued.net>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Boardrev is always treated as a u32 everywhere else, no reason to
byteswap the 0xc2 value.  The only use is to print out if it is
a prerelease board, the test being:

(olpc_platform_info.boardrev & 0xf) < 8

Which is currently always true as be32_to_cpu(0xc2) & 0xf = 0
but I doubt that was the intention here.  The consequences of the bug
are pretty minor though (incorrect boardrev displayed in dmesg when
ofw support not configured)

Also annotate the temporary used to read the boardrev in the ofw
case.

The confusion was noticed by Sparse:

  arch/x86/kernel/olpc.c:206:32: warning: cast to restricted __be32
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This adds support for OLPC XO hardware.  Open Firmware on XOs don't contain
the VSA, so it is necessary to emulate the PCI BARs in the kernel.  This also
adds functionality for running EC commands, and a CONFIG_OLPC.

A number of OLPC drivers depend upon CONFIG_OLPC.

olpc_ec_timeout is a hack to work around Embedded Controller bugs.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: geode_has_vsa build fix]
[akpm@linux-foundation.org: olpc_register_battery_callback doesn't exist]
Signed-off-by: NAndres Salomon <dilinger@debian.org>
Acked-by: NIngo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>