linux-kernel - Re: [PATCH 08/23] m68k/coldfire/pit: Migrate to new 'set-state' interface

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Date:	Thu, 16 Jul 2015 22:42:18 +1000
From:	Greg Ungerer <gerg@...inux.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-m68k@...ts.linux-m68k.org
Subject: Re: [PATCH 08/23] m68k/coldfire/pit: Migrate to new 'set-state' interface

Hi Viresh,

On 16/07/15 21:26, Viresh Kumar wrote:
> Migrate m68k 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.
>
> We weren't doing anything in ->set_mode(RESUME) and so tick_resume()
> isn't implemented.
>
> Cc: Greg Ungerer <gerg@...inux.org>

Applied and tested ok (against 4.2-rc2).

Acked-by: Greg Ungerer <gerg@...inux.org>


> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: linux-m68k@...ts.linux-m68k.org
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>   arch/m68k/coldfire/pit.c | 66 ++++++++++++++++++++++--------------------------
>   1 file changed, 30 insertions(+), 36 deletions(-)
>
> diff --git a/arch/m68k/coldfire/pit.c b/arch/m68k/coldfire/pit.c
> index 493b3111d4c1..d86a9ffb3f13 100644
> --- a/arch/m68k/coldfire/pit.c
> +++ b/arch/m68k/coldfire/pit.c
> @@ -42,37 +42,28 @@ static u32 pit_cnt;
>    * This is also called after resume to bring the PIT into operation again.
>    */
>   
> -static void init_cf_pit_timer(enum clock_event_mode mode,
> -                             struct clock_event_device *evt)
> +static int cf_pit_set_periodic(struct clock_event_device *evt)
>   {
> -	switch (mode) {
> -	case CLOCK_EVT_MODE_PERIODIC:
> -
> -		__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> -		__raw_writew(PIT_CYCLES_PER_JIFFY, TA(MCFPIT_PMR));
> -		__raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | \
> -				MCFPIT_PCSR_OVW | MCFPIT_PCSR_RLD | \
> -				MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR));
> -		break;
> -
> -	case CLOCK_EVT_MODE_SHUTDOWN:
> -	case CLOCK_EVT_MODE_UNUSED:
> -
> -		__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> -		break;
> -
> -	case CLOCK_EVT_MODE_ONESHOT:
> -
> -		__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> -		__raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE | \
> -				MCFPIT_PCSR_OVW | MCFPIT_PCSR_CLK64, \
> -				TA(MCFPIT_PCSR));
> -		break;
> -
> -	case CLOCK_EVT_MODE_RESUME:
> -		/* Nothing to do here */
> -		break;
> -	}
> +	__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> +	__raw_writew(PIT_CYCLES_PER_JIFFY, TA(MCFPIT_PMR));
> +	__raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE |
> +		     MCFPIT_PCSR_OVW | MCFPIT_PCSR_RLD |
> +		     MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR));
> +	return 0;
> +}
> +
> +static int cf_pit_set_oneshot(struct clock_event_device *evt)
> +{
> +	__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> +	__raw_writew(MCFPIT_PCSR_EN | MCFPIT_PCSR_PIE |
> +		     MCFPIT_PCSR_OVW | MCFPIT_PCSR_CLK64, TA(MCFPIT_PCSR));
> +	return 0;
> +}
> +
> +static int cf_pit_shutdown(struct clock_event_device *evt)
> +{
> +	__raw_writew(MCFPIT_PCSR_DISABLE, TA(MCFPIT_PCSR));
> +	return 0;
>   }
>   
>   /*
> @@ -88,12 +79,15 @@ static int cf_pit_next_event(unsigned long delta,
>   }
>   
>   struct clock_event_device cf_pit_clockevent = {
> -	.name		= "pit",
> -	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> -	.set_mode	= init_cf_pit_timer,
> -	.set_next_event	= cf_pit_next_event,
> -	.shift		= 32,
> -	.irq		= MCF_IRQ_PIT1,
> +	.name			= "pit",
> +	.features		= CLOCK_EVT_FEAT_PERIODIC |
> +				  CLOCK_EVT_FEAT_ONESHOT,
> +	.set_state_shutdown	= cf_pit_shutdown,
> +	.set_state_periodic	= cf_pit_set_periodic,
> +	.set_state_oneshot	= cf_pit_set_oneshot,
> +	.set_next_event		= cf_pit_next_event,
> +	.shift			= 32,
> +	.irq			= MCF_IRQ_PIT1,
>   };
>   
>   

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