From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC 2/8] ARM:global_timer: Add ARM global timer support.
Date: Wed, 8 May 2013 16:38:22 +0200 [thread overview]
Message-ID: <201305081638.23100.arnd@arndb.de> (raw)
In-Reply-To: <1368022260-2197-1-git-send-email-srinivas.kandagatla@st.com>
On Wednesday 08 May 2013, Srinivas KANDAGATLA wrote:
> From: Stuart Menefy <stuart.menefy@st•com>
>
> This is a simple driver for the global timer module found in the Cortex
> A9-MP cores from revision r1p0 onwards. This should be able to perform
> the functions of the system timer and the local timer in an SMP system.
>
> The global timer has the following features:
> The global timer is a 64-bit incrementing counter with an
> auto-incrementing feature. It continues incrementing after sending
> interrupts. The global timer is memory mapped in the private memory
> region.
> The global timer is accessible to all Cortex-A9 processors in the
> cluster. Each Cortex-A9 processor has a private 64-bit comparator that
> is used to assert a private interrupt when the global timer has reached
> the comparator value. All the Cortex-A9 processors in a design use the
> banked ID, ID27, for this interrupt. ID27 is sent to the Interrupt
> Controller as a Private Peripheral Interrupt. The global timer is
> clocked by PERIPHCLK.
>
> Signed-off-by: Stuart Menefy <stuart.menefy@st•com>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st•com>
>
Are you sure we don't already have a driver for this? It sounds unlikely
that you are the first one to do this when the hardware is so common.
> Documentation/devicetree/bindings/arm/gt.txt | 21 ++
> arch/arm/Kconfig | 6 +
> arch/arm/include/asm/global_timer.h | 12 +
> arch/arm/kernel/Makefile | 1 +
> arch/arm/kernel/global_timer.c | 325 ++++++++++++++++++++++++++
> 5 files changed, 365 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/arm/gt.txt
> create mode 100644 arch/arm/include/asm/global_timer.h
> create mode 100644 arch/arm/kernel/global_timer.c
Move it into drivers/clocksource?
> diff --git a/arch/arm/include/asm/global_timer.h b/arch/arm/include/asm/global_timer.h
> new file mode 100644
> index 0000000..46f9188
> --- /dev/null
> +++ b/arch/arm/include/asm/global_timer.h
> @@ -0,0 +1,12 @@
> +int __init global_timer_init(void __iomem *base, unsigned int timer_irq);
I don't see a need to call this from platform code for non-DT platforms, it
can easily be used with CLOCKSOURCE_OF_DECLARE() all the time I think.
Arnd
next prev parent reply other threads:[~2013-05-08 14:38 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-08 14:09 [RFC 0/8] ARM:STiH41x: Add STiH41x platform and board support Srinivas KANDAGATLA
[not found] ` <1368022248-2153-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 14:34 ` [RFC 1/8] serial:st-asc: Add ST ASC driver Arnd Bergmann
2013-05-08 14:39 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 18:18 ` Srinivas KANDAGATLA
2013-05-08 19:55 ` Arnd Bergmann
2013-05-08 15:34 ` Greg KH
2013-05-08 15:40 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 15:53 ` Greg KH
2013-05-08 16:03 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 16:15 ` Greg KH
2013-05-08 16:31 ` Arnd Bergmann
2013-05-08 16:36 ` Greg KH
2013-05-10 23:29 ` Russell King - ARM Linux
2013-05-08 16:39 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 16:45 ` Nicolas Pitre
2013-05-08 18:35 ` Arnd Bergmann
2013-05-09 13:36 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 16:10 ` Stephen GALLIMORE
2013-05-10 14:45 ` Ben Dooks
2013-05-10 15:23 ` Greg KH
2013-05-10 15:31 ` Ben Dooks
2013-05-10 15:40 ` Stuart MENEFY
2013-05-08 18:02 ` Srinivas KANDAGATLA
[not found] ` <1368022272-2241-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 14:50 ` [RFC 3/8] mfd:syscon: Introduce claim/read/write/release APIs Arnd Bergmann
2013-05-08 15:01 ` Mark Brown
2013-05-08 17:42 ` Srinivas KANDAGATLA
2013-05-09 9:51 ` Mark Brown
2013-05-09 11:58 ` Srinivas KANDAGATLA
2013-05-09 13:26 ` Mark Brown
2013-05-09 14:00 ` Srinivas KANDAGATLA
2013-05-09 14:40 ` Mark Brown
2013-05-09 14:47 ` Srinivas KANDAGATLA
2013-05-10 12:51 ` Srinivas KANDAGATLA
2013-05-08 17:32 ` Srinivas KANDAGATLA
2013-05-08 19:48 ` Arnd Bergmann
2013-05-09 10:17 ` Srinivas KANDAGATLA
2013-05-17 14:36 ` Arnd Bergmann
2013-05-20 12:48 ` Srinivas KANDAGATLA
2013-05-23 21:44 ` Arnd Bergmann
2013-05-24 16:06 ` Srinivas KANDAGATLA
[not found] ` <1368022284-2283-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 15:06 ` [RFC 4/8] pinctrl:stixxxx: Add pinctrl and pinconf support Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 16:27 ` Srinivas KANDAGATLA
2013-05-08 16:38 ` Jean-Christophe PLAGNIOL-VILLARD
[not found] ` <1368022297-2334-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 16:18 ` [RFC 5/8] ARM:stih41x: Add STiH415 SOC support Arnd Bergmann
2013-05-08 16:21 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 16:50 ` Stephen GALLIMORE
2013-05-08 18:55 ` Arnd Bergmann
2013-05-09 11:09 ` Stephen GALLIMORE
2013-05-08 17:03 ` Srinivas KANDAGATLA
[not found] ` <1368022329-2424-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 16:20 ` [RFC 7/8] ARM:stih41x: Add B2000 board support Arnd Bergmann
2013-05-08 16:24 ` Jean-Christophe PLAGNIOL-VILLARD
2013-05-08 17:04 ` Srinivas KANDAGATLA
[not found] ` <1368022260-2197-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-08 14:26 ` [RFC 2/8] ARM:global_timer: Add ARM global timer support Rob Herring
2013-05-08 15:06 ` Stuart MENEFY
2013-05-08 14:38 ` Arnd Bergmann [this message]
2013-05-08 14:49 ` Will Deacon
2013-05-08 15:48 ` Stuart MENEFY
2013-05-08 16:23 ` Arnd Bergmann
2013-05-08 14:51 ` Steffen Trumtrar
2013-05-09 14:07 ` Srinivas KANDAGATLA
2013-05-09 14:51 ` Arnd Bergmann
2013-05-09 14:51 ` Srinivas KANDAGATLA
2013-05-13 19:05 ` Linus Walleij
2013-05-13 19:30 ` Thomas Gleixner
2013-05-14 8:46 ` Srinivas KANDAGATLA
2013-05-14 9:23 ` Linus Walleij
2013-05-14 10:26 ` Srinivas KANDAGATLA
[not found] ` <1368022318-2380-1-git-send-email-srinivas.kandagatla@st.com>
2013-05-15 19:41 ` [RFC 6/8] ARM:stih41x: Add STiH416 SOC support Linus Walleij
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