<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-toradex.git/arch/arm/mach-msm/timer.c, branch v3.12.27</title>
<subtitle>Linux kernel for Apalis and Colibri modules</subtitle>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/'/>
<entry>
<title>Merge branch 'msm/cleanup' into next/cleanup</title>
<updated>2013-08-13T22:12:20+00:00</updated>
<author>
<name>Kevin Hilman</name>
<email>khilman@linaro.org</email>
</author>
<published>2013-08-13T22:12:02+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=bee22087faf5bbf33fcb61e6c5e8f8ef7ebd77a5'/>
<id>bee22087faf5bbf33fcb61e6c5e8f8ef7ebd77a5</id>
<content type='text'>
From David Brown &lt;davidb@codeaurora.org&gt;:
* msm/cleanup:
  ARM: msm: Only compile io.c on platforms that use it
  iommu/msm: Move mach includes to iommu directory
  ARM: msm: Remove devices-iommu.c
  ARM: msm: Move mach/board.h contents to common.h
  ARM: msm: Migrate msm_timer to CLOCKSOURCE_OF_DECLARE
  ARM: msm: Remove TMR and TMR0 static mappings
  ARM: msm: Move debug-macro.S to include/debug
  ARM: msm: Don't compile __msm_ioremap_caller() unless used
  ARM: msm: Remove unused and unmapped MSM_TLMM_BASE for 8x60

Signed-off-by: Kevin Hilman &lt;khilman@linaro.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
From David Brown &lt;davidb@codeaurora.org&gt;:
* msm/cleanup:
  ARM: msm: Only compile io.c on platforms that use it
  iommu/msm: Move mach includes to iommu directory
  ARM: msm: Remove devices-iommu.c
  ARM: msm: Move mach/board.h contents to common.h
  ARM: msm: Migrate msm_timer to CLOCKSOURCE_OF_DECLARE
  ARM: msm: Remove TMR and TMR0 static mappings
  ARM: msm: Move debug-macro.S to include/debug
  ARM: msm: Don't compile __msm_ioremap_caller() unless used
  ARM: msm: Remove unused and unmapped MSM_TLMM_BASE for 8x60

Signed-off-by: Kevin Hilman &lt;khilman@linaro.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>ARM: msm: Migrate msm_timer to CLOCKSOURCE_OF_DECLARE</title>
<updated>2013-08-06T18:18:02+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-07-24T20:54:30+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=c602520ff8da605becd62c25e271210b336d8eca'/>
<id>c602520ff8da605becd62c25e271210b336d8eca</id>
<content type='text'>
This allows us to remove the init_time callback in the DT machine
descriptors, shrinking the code.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
This allows us to remove the init_time callback in the DT machine
descriptors, shrinking the code.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'remove-local-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm into next/cleanup</title>
<updated>2013-07-23T23:54:15+00:00</updated>
<author>
<name>Olof Johansson</name>
<email>olof@lixom.net</email>
</author>
<published>2013-07-23T21:51:34+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=47dcd3563e45fc5a59bf7f3326ef56087be8bebe'/>
<id>47dcd3563e45fc5a59bf7f3326ef56087be8bebe</id>
<content type='text'>
From Stephen Boyd:

Now that we have a generic arch hook for broadcast we can remove the
local timer API entirely. Doing so will reduce code in ARM core, reduce
the architecture dependencies of our timer drivers, and simplify the code
because we no longer go through an architecture layer that is essentially
a hotplug notifier.

* tag 'remove-local-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: smp: Remove local timer API
  clocksource: time-armada-370-xp: Divorce from local timer API
  clocksource: time-armada-370-xp: Fix sparse warning
  ARM: msm: Divorce msm_timer from local timer API
  ARM: PRIMA2: Divorce timer-marco from local timer API
  ARM: EXYNOS4: Divorce mct from local timer API
  ARM: OMAP2+: Divorce from local timer API
  ARM: smp_twd: Divorce smp_twd from local timer API
  ARM: smp: Remove duplicate dummy timer implementation

Resolved a large number of conflicts due to __cpuinit cleanups, etc.

Signed-off-by: Olof Johansson &lt;olof@lixom.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
From Stephen Boyd:

Now that we have a generic arch hook for broadcast we can remove the
local timer API entirely. Doing so will reduce code in ARM core, reduce
the architecture dependencies of our timer drivers, and simplify the code
because we no longer go through an architecture layer that is essentially
a hotplug notifier.

* tag 'remove-local-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: smp: Remove local timer API
  clocksource: time-armada-370-xp: Divorce from local timer API
  clocksource: time-armada-370-xp: Fix sparse warning
  ARM: msm: Divorce msm_timer from local timer API
  ARM: PRIMA2: Divorce timer-marco from local timer API
  ARM: EXYNOS4: Divorce mct from local timer API
  ARM: OMAP2+: Divorce from local timer API
  ARM: smp_twd: Divorce smp_twd from local timer API
  ARM: smp: Remove duplicate dummy timer implementation

Resolved a large number of conflicts due to __cpuinit cleanups, etc.

Signed-off-by: Olof Johansson &lt;olof@lixom.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>arm: delete __cpuinit/__CPUINIT usage from all ARM users</title>
<updated>2013-07-14T23:36:52+00:00</updated>
<author>
<name>Paul Gortmaker</name>
<email>paul.gortmaker@windriver.com</email>
</author>
<published>2013-06-17T19:43:14+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=8bd26e3a7e49af2697449bbcb7187a39dc85d672'/>
<id>8bd26e3a7e49af2697449bbcb7187a39dc85d672</id>
<content type='text'>
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit  -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings.  In any case, they are temporary and harmless.

This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code.  It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: Russell King &lt;linux@arm.linux.org.uk&gt;
Cc: Will Deacon &lt;will.deacon@arm.com&gt;
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker &lt;paul.gortmaker@windriver.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit  -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings.  In any case, they are temporary and harmless.

This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code.  It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: Russell King &lt;linux@arm.linux.org.uk&gt;
Cc: Will Deacon &lt;will.deacon@arm.com&gt;
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker &lt;paul.gortmaker@windriver.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>ARM: msm: Divorce msm_timer from local timer API</title>
<updated>2013-06-25T00:46:50+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-02-16T01:31:31+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=4d70c59bb5be9e41a06b9f11ecfba75c14f9fea7'/>
<id>4d70c59bb5be9e41a06b9f11ecfba75c14f9fea7</id>
<content type='text'>
Separate the msm_timer from the local timer API. This will allow
us to remove ARM local timer support in the near future and gets
us closer to moving this driver to drivers/clocksource.

Acked-by: David Brown &lt;davidb@codeaurora.org&gt;
Acked-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: Daniel Walker &lt;dwalker@fifo99.com&gt;
Cc: Bryan Huntsman &lt;bryanh@codeaurora.org&gt;
Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Separate the msm_timer from the local timer API. This will allow
us to remove ARM local timer support in the near future and gets
us closer to moving this driver to drivers/clocksource.

Acked-by: David Brown &lt;davidb@codeaurora.org&gt;
Acked-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: Daniel Walker &lt;dwalker@fifo99.com&gt;
Cc: Bryan Huntsman &lt;bryanh@codeaurora.org&gt;
Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>sched_clock: Make ARM's sched_clock generic for all architectures</title>
<updated>2013-06-12T21:02:13+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-06-02T06:39:40+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=38ff87f77af0b5a93fc8581cff1d6e5692ab8970'/>
<id>38ff87f77af0b5a93fc8581cff1d6e5692ab8970</id>
<content type='text'>
Nothing about the sched_clock implementation in the ARM port is
specific to the architecture. Generalize the code so that other
architectures can use it by selecting GENERIC_SCHED_CLOCK.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
[jstultz: Merge minor collisions with other patches in my tree]
Signed-off-by: John Stultz &lt;john.stultz@linaro.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Nothing about the sched_clock implementation in the ARM port is
specific to the architecture. Generalize the code so that other
architectures can use it by selecting GENERIC_SCHED_CLOCK.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
[jstultz: Merge minor collisions with other patches in my tree]
Signed-off-by: John Stultz &lt;john.stultz@linaro.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'msm-core-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm into next/soc</title>
<updated>2013-04-15T03:49:28+00:00</updated>
<author>
<name>Olof Johansson</name>
<email>olof@lixom.net</email>
</author>
<published>2013-04-15T03:49:21+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=b56a7f9206efa2982140837e36aca88cfedd66bc'/>
<id>b56a7f9206efa2982140837e36aca88cfedd66bc</id>
<content type='text'>
From David Brown:
Patches for MSM core

These patches are changes to the MSM timer code that will be for
upcoming targets, including a generalization of the binding and
preventing a missing timer interrupt.

* tag 'msm-core-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: msm: Wait for timer clear to complete
  ARM: msm: Rework timer binding to be more general

Signed-off-by: Olof Johansson &lt;olof@lixom.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
From David Brown:
Patches for MSM core

These patches are changes to the MSM timer code that will be for
upcoming targets, including a generalization of the binding and
preventing a missing timer interrupt.

* tag 'msm-core-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: msm: Wait for timer clear to complete
  ARM: msm: Rework timer binding to be more general

Signed-off-by: Olof Johansson &lt;olof@lixom.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>ARM: msm: Wait for timer clear to complete</title>
<updated>2013-03-22T17:46:16+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-03-15T03:31:39+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=e25e3d1fef2c57e49aef64535341c15fe2b29b4a'/>
<id>e25e3d1fef2c57e49aef64535341c15fe2b29b4a</id>
<content type='text'>
Without looping on the status bit, there is no way to guarantee
that a clear of the timer has actually completed. This can cause
us to enable the timer before the count has cleared and miss a
timer interrupt. To simplify this patch, remove the timer
register setup done during timer init, since it's duplicate work
that is eventually done in the set_next_event() callback.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Without looping on the status bit, there is no way to guarantee
that a clear of the timer has actually completed. This can cause
us to enable the timer before the count has cleared and miss a
timer interrupt. To simplify this patch, remove the timer
register setup done during timer init, since it's duplicate work
that is eventually done in the set_next_event() callback.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>ARM: msm: Rework timer binding to be more general</title>
<updated>2013-03-22T17:46:16+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-03-15T03:31:38+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=eebdb0c1e1d63532399f7cbb65ade5969d63df06'/>
<id>eebdb0c1e1d63532399f7cbb65ade5969d63df06</id>
<content type='text'>
The msm timer binding I wrote is bad. First off, the clock
frequency in the binding for the dgt is wrong. Software divides
down the input rate by 4 to achieve the rate listed in the
binding. We also treat each individual timer as a separate
hardware component, when in reality there is one timer block
(that may be duplicated per cpu) with multiple timers within it.
Depending on the version of the hardware there can be one or two
general purpose timers, status and divider control registers, and
an entirely different register layout.

In the next patch we'll need to know about the different register
layouts so that we can properly check the status register after
clearing the count. The current binding makes this complicated
because the general purpose timer's reg property doesn't indicate
where that status register is, and in fact it is beyond the size
of the reg property.

Clean all this up by just having one node for the timer hardware,
and describe all the interrupts and clock frequencies supported
while having one reg property that covers the entire timer
register region. We'll use the compatible field in the future to
determine different register layouts and if we should read the
status registers, etc.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The msm timer binding I wrote is bad. First off, the clock
frequency in the binding for the dgt is wrong. Software divides
down the input rate by 4 to achieve the rate listed in the
binding. We also treat each individual timer as a separate
hardware component, when in reality there is one timer block
(that may be duplicated per cpu) with multiple timers within it.
Depending on the version of the hardware there can be one or two
general purpose timers, status and divider control registers, and
an entirely different register layout.

In the next patch we'll need to know about the different register
layouts so that we can properly check the status register after
clearing the count. The current binding makes this complicated
because the general purpose timer's reg property doesn't indicate
where that status register is, and in fact it is beyond the size
of the reg property.

Clean all this up by just having one node for the timer hardware,
and describe all the interrupts and clock frequencies supported
while having one reg property that covers the entire timer
register region. We'll use the compatible field in the future to
determine different register layouts and if we should read the
status registers, etc.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>ARM: msm: Stop counting before reprogramming clockevent</title>
<updated>2013-03-22T17:45:39+00:00</updated>
<author>
<name>Stephen Boyd</name>
<email>sboyd@codeaurora.org</email>
</author>
<published>2013-03-15T03:31:37+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=4080d2d11a2d572228c2b8d02406e997b87ba6a5'/>
<id>4080d2d11a2d572228c2b8d02406e997b87ba6a5</id>
<content type='text'>
If the clockevent is forcibly reprogrammed to have a different
match value we mistakenly assume the timer is not ticking and
program a new match value while the timer is running. Although we
clear the timer before programming a new match, it's better to
stop the timer before clearing it so that we're sure the proper
amount of ticks are counted. Failure to do so can lead to missed
ticks and system hangs.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
If the clockevent is forcibly reprogrammed to have a different
match value we mistakenly assume the timer is not ticking and
program a new match value while the timer is running. Although we
clear the timer before programming a new match, it's better to
stop the timer before clearing it so that we're sure the proper
amount of ticks are counted. Failure to do so can lead to missed
ticks and system hangs.

Signed-off-by: Stephen Boyd &lt;sboyd@codeaurora.org&gt;
Signed-off-by: David Brown &lt;davidb@codeaurora.org&gt;
</pre>
</div>
</content>
</entry>
</feed>
