linux-kernel - Re: [PATCH 16/18] ARM/w90x900/time: Migrate to new 'set-state' interface

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Date:	Fri, 24 Jul 2015 12:53:01 +0800
From:	Wan ZongShun <mcuos.com@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	arm@...nel.org, Olof Johansson <olof@...om.net>,
	linaro-kernel@...ts.linaro.org, arnd.bergmann@...aro.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 16/18] ARM/w90x900/time: Migrate to new 'set-state' interface

2015-07-17 13:11 GMT+08:00 Viresh Kumar <viresh.kumar@...aro.org>:
> Migrate w90x900 driver to the new 'set-state' interface provided by
> clockevents core, the earlier 'set-mode' interface is marked obsolete
> now.
>
> This also enables us to implement callbacks for new states of clockevent
> devices, for example: ONESHOT_STOPPED.
>
> Cc: Wan ZongShun <mcuos.com@...il.com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  arch/arm/mach-w90x900/time.c | 51 ++++++++++++++++++++++++--------------------
>  1 file changed, 28 insertions(+), 23 deletions(-)
>
> diff --git a/arch/arm/mach-w90x900/time.c b/arch/arm/mach-w90x900/time.c
> index 9230d3725599..cd1966ec9143 100644
> --- a/arch/arm/mach-w90x900/time.c
> +++ b/arch/arm/mach-w90x900/time.c
> @@ -48,31 +48,32 @@
>
>  static unsigned int timer0_load;
>
> -static void nuc900_clockevent_setmode(enum clock_event_mode mode,
> -               struct clock_event_device *clk)
> +static int nuc900_clockevent_shutdown(struct clock_event_device *evt)
>  {
> -       unsigned int val;
> +       unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
>
> -       val = __raw_readl(REG_TCSR0);
> -       val &= ~(0x03 << 27);
> +       __raw_writel(val, REG_TCSR0);
> +       return 0;
> +}
> +
> +static int nuc900_clockevent_set_oneshot(struct clock_event_device *evt)
> +{
> +       unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
>
> -       switch (mode) {
> -       case CLOCK_EVT_MODE_PERIODIC:
> -               __raw_writel(timer0_load, REG_TICR0);
> -               val |= (PERIOD | COUNTEN | INTEN | PRESCALE);
> -               break;
> +       val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);
>
> -       case CLOCK_EVT_MODE_ONESHOT:
> -               val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);
> -               break;
> +       __raw_writel(val, REG_TCSR0);
> +       return 0;
> +}
>
> -       case CLOCK_EVT_MODE_UNUSED:
> -       case CLOCK_EVT_MODE_SHUTDOWN:
> -       case CLOCK_EVT_MODE_RESUME:
> -               break;
> -       }
> +static int nuc900_clockevent_set_periodic(struct clock_event_device *evt)
> +{
> +       unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
>
> +       __raw_writel(timer0_load, REG_TICR0);
> +       val |= (PERIOD | COUNTEN | INTEN | PRESCALE);
>         __raw_writel(val, REG_TCSR0);
> +       return 0;
>  }
>
>  static int nuc900_clockevent_setnextevent(unsigned long evt,
> @@ -90,11 +91,15 @@ static int nuc900_clockevent_setnextevent(unsigned long evt,
>  }
>
>  static struct clock_event_device nuc900_clockevent_device = {
> -       .name           = "nuc900-timer0",
> -       .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> -       .set_mode       = nuc900_clockevent_setmode,
> -       .set_next_event = nuc900_clockevent_setnextevent,
> -       .rating         = 300,
> +       .name                   = "nuc900-timer0",
> +       .features               = CLOCK_EVT_FEAT_PERIODIC |
> +                                 CLOCK_EVT_FEAT_ONESHOT,
> +       .set_state_shutdown     = nuc900_clockevent_shutdown,
> +       .set_state_periodic     = nuc900_clockevent_set_periodic,
> +       .set_state_oneshot      = nuc900_clockevent_set_oneshot,
> +       .tick_resume            = nuc900_clockevent_shutdown,
> +       .set_next_event         = nuc900_clockevent_setnextevent,
> +       .rating                 = 300,
>  };
>

Acked-by: Wan zongshun <mcuos.com@...il.com>

thanks!

>  /*IRQ handler for the timer*/
> --
> 2.4.0
>



-- 
---
Vincent Wan(Zongshun)
www.mcuos.com
--
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