linux-kernel - Re: [PATCH 06/11] ARM: pxa: convert timer suspend/resume to clock_event

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Date:	Fri, 9 Nov 2012 10:05:41 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, Stephen Warren <swarren@...dia.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: [PATCH 06/11] ARM: pxa: convert timer suspend/resume to clock_event_device

On Fri, Nov 9, 2012 at 5:01 AM, Stephen Warren <swarren@...dotorg.org> wrote:
> From: Stephen Warren <swarren@...dia.com>
>
> Move PXA's timer suspend/resume functions from struct sys_timer
> pxa_timer into struct clock_event_device ckevt_pxa_osmr0. This
> will allow the sys_timer suspend/resume fields to be removed, and
> eventually lead to a complete removal of struct sys_timer.
>
> Cc: Eric Miao <eric.y.miao@...il.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Haojian Zhuang <haojian.zhuang@...il.com>
> Signed-off-by: Stephen Warren <swarren@...dia.com>

Acked-by: Eric Miao <eric.y.miao@...il.com>

> ---
>  arch/arm/mach-pxa/time.c |   76 +++++++++++++++++++++++-----------------------
>  1 files changed, 38 insertions(+), 38 deletions(-)
>
> diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
> index 4bc47d6..ce58bc9 100644
> --- a/arch/arm/mach-pxa/time.c
> +++ b/arch/arm/mach-pxa/time.c
> @@ -89,12 +89,50 @@ pxa_osmr0_set_mode(enum clock_event_mode mode, struct clock_event_device *dev)
>         }
>  }
>
> +#ifdef CONFIG_PM
> +static unsigned long osmr[4], oier, oscr;
> +
> +static void pxa_timer_suspend(struct clock_event_device *cedev)
> +{
> +       osmr[0] = readl_relaxed(OSMR0);
> +       osmr[1] = readl_relaxed(OSMR1);
> +       osmr[2] = readl_relaxed(OSMR2);
> +       osmr[3] = readl_relaxed(OSMR3);
> +       oier = readl_relaxed(OIER);
> +       oscr = readl_relaxed(OSCR);
> +}
> +
> +static void pxa_timer_resume(struct clock_event_device *cedev)
> +{
> +       /*
> +        * Ensure that we have at least MIN_OSCR_DELTA between match
> +        * register 0 and the OSCR, to guarantee that we will receive
> +        * the one-shot timer interrupt.  We adjust OSMR0 in preference
> +        * to OSCR to guarantee that OSCR is monotonically incrementing.
> +        */
> +       if (osmr[0] - oscr < MIN_OSCR_DELTA)
> +               osmr[0] += MIN_OSCR_DELTA;
> +
> +       writel_relaxed(osmr[0], OSMR0);
> +       writel_relaxed(osmr[1], OSMR1);
> +       writel_relaxed(osmr[2], OSMR2);
> +       writel_relaxed(osmr[3], OSMR3);
> +       writel_relaxed(oier, OIER);
> +       writel_relaxed(oscr, OSCR);
> +}
> +#else
> +#define pxa_timer_suspend NULL
> +#define pxa_timer_resume NULL
> +#endif
> +
>  static struct clock_event_device ckevt_pxa_osmr0 = {
>         .name           = "osmr0",
>         .features       = CLOCK_EVT_FEAT_ONESHOT,
>         .rating         = 200,
>         .set_next_event = pxa_osmr0_set_next_event,
>         .set_mode       = pxa_osmr0_set_mode,
> +       .suspend        = pxa_timer_suspend,
> +       .resume         = pxa_timer_resume,
>  };
>
>  static struct irqaction pxa_ost0_irq = {
> @@ -127,44 +165,6 @@ static void __init pxa_timer_init(void)
>         clockevents_register_device(&ckevt_pxa_osmr0);
>  }
>
> -#ifdef CONFIG_PM
> -static unsigned long osmr[4], oier, oscr;
> -
> -static void pxa_timer_suspend(void)
> -{
> -       osmr[0] = readl_relaxed(OSMR0);
> -       osmr[1] = readl_relaxed(OSMR1);
> -       osmr[2] = readl_relaxed(OSMR2);
> -       osmr[3] = readl_relaxed(OSMR3);
> -       oier = readl_relaxed(OIER);
> -       oscr = readl_relaxed(OSCR);
> -}
> -
> -static void pxa_timer_resume(void)
> -{
> -       /*
> -        * Ensure that we have at least MIN_OSCR_DELTA between match
> -        * register 0 and the OSCR, to guarantee that we will receive
> -        * the one-shot timer interrupt.  We adjust OSMR0 in preference
> -        * to OSCR to guarantee that OSCR is monotonically incrementing.
> -        */
> -       if (osmr[0] - oscr < MIN_OSCR_DELTA)
> -               osmr[0] += MIN_OSCR_DELTA;
> -
> -       writel_relaxed(osmr[0], OSMR0);
> -       writel_relaxed(osmr[1], OSMR1);
> -       writel_relaxed(osmr[2], OSMR2);
> -       writel_relaxed(osmr[3], OSMR3);
> -       writel_relaxed(oier, OIER);
> -       writel_relaxed(oscr, OSCR);
> -}
> -#else
> -#define pxa_timer_suspend NULL
> -#define pxa_timer_resume NULL
> -#endif
> -
>  struct sys_timer pxa_timer = {
>         .init           = pxa_timer_init,
> -       .suspend        = pxa_timer_suspend,
> -       .resume         = pxa_timer_resume,
>  };
> --
> 1.7.0.4
>
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