From: johlstei@codeaurora.org (johlstei)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 00/15] Make SMP timers standalone
Date: Thu, 05 Jan 2012 11:34:14 -0800 [thread overview]
Message-ID: <4F05FB36.7020509@codeaurora.org> (raw)
In-Reply-To: <CACRpkdYjQPoY60XdhTwgLYbTrQMhC=Wxk5Y=hP2Vr0DngUJbxg@mail.gmail.com>
On 01/05/2012 02:26 AM, Linus Walleij wrote:
> On Thu, Jan 5, 2012 at 2:17 AM, David Brown<davidb@codeaurora.org> wrote:
>> On Wed, Jan 04, 2012 at 05:39:16PM +0000, Marc Zyngier wrote:
>>> I do. But on some non-SMP platforms, the local timer and the global
>>> timer can actually be the same (MSM is one example of this, and the UP
>>> version of the Cortex A15 is another).
>> On SMP MSM, we use the CPU0 local timer as the global timer. They are
>> the same on non-SMP as well,
> Does this mean your CPU0 local timer is always on, always clocked?
> And do you use ARMs SMP TWD IP block for that?
>
Yes, CPU0's local timer is always on. We use it as a global clocksource,
as well
as for udelay on both cores. It is not ARM's SMP TWD block, it is our
own. The
timer blocks can each be read from both CPUs, but can only generate IRQs
to one
or the other.
Jeff
prev parent reply other threads:[~2012-01-05 19:34 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 17:27 [PATCH v2 00/15] Make SMP timers standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 01/15] ARM: local timers: allow smp_twd to be used standalone Marc Zyngier
2011-12-22 20:38 ` Russell King - ARM Linux
2011-12-22 17:27 ` [PATCH v2 02/15] ARM: smp_twd: add device tree support Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 03/15] ARM: local timers: switch realview to standalone smp_twd Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 04/15] ARM: local timers: switch vexpress " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 05/15] ARM: local timers: remove localtimer.c from plat-versatile Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 06/15] ARM: local timers: switch tegra to standalone smp_twd Marc Zyngier
2011-12-22 19:22 ` Colin Cross
2011-12-22 17:27 ` [PATCH v2 07/15] ARM: local timers: switch omap4 " Marc Zyngier
2011-12-23 6:37 ` Shilimkar, Santosh
2011-12-22 17:27 ` [PATCH v2 08/15] ARM: local timers: switch shmobile " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 09/15] ARM: local timers: switch ux500 " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 10/15] ARM: local timers: switch highbank " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 11/15] ARM: local timers: switch imx6q " Marc Zyngier
2011-12-25 13:40 ` Shawn Guo
2011-12-22 17:27 ` [PATCH v2 12/15] ARM: smp_twd: remove support for non-standalone version Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 13/15] ARM: local timers: make MCT timer standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 14/15] ARM: local timers: make MSM timers standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 15/15] ARM: local timers: Remove CONFIG_LOCAL_TIMERS support Marc Zyngier
2011-12-22 19:32 ` [PATCH v2 00/15] Make SMP timers standalone Russell King - ARM Linux
2012-01-04 17:39 ` Marc Zyngier
2012-01-04 21:47 ` Russell King - ARM Linux
2012-01-05 0:00 ` Linus Walleij
2012-01-05 11:08 ` Marc Zyngier
2012-01-05 11:13 ` Shilimkar, Santosh
2012-01-05 11:19 ` Marc Zyngier
2012-01-05 11:26 ` Russell King - ARM Linux
2012-01-05 11:35 ` Marc Zyngier
2012-01-05 12:10 ` Russell King - ARM Linux
2012-01-05 16:13 ` Marc Zyngier
2012-01-05 16:26 ` Russell King - ARM Linux
2012-01-05 16:55 ` Russell King - ARM Linux
2012-01-05 11:31 ` Shilimkar, Santosh
2012-01-05 10:33 ` Marc Zyngier
2012-01-05 10:45 ` Shilimkar, Santosh
2012-01-05 1:17 ` David Brown
2012-01-05 10:26 ` Linus Walleij
2012-01-05 11:01 ` Russell King - ARM Linux
2012-01-05 19:34 ` johlstei [this message]
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