linux-kernel - Re: [PATCH] clocksource: convert S5PV210 32-bit down counting clocksource

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Message-id: <4E2104F1.9050104@samsung.com>
Date:	Sat, 16 Jul 2011 12:26:41 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	'Russell King - ARM Linux' <linux@....linux.org.uk>,
	'Ben Dooks' <ben-linux@...ff.org>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'linux-arm-kernel' <linux-arm-kernel@...ts.infradead.org>,
	'linux-kernel' <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clocksource: convert S5PV210 32-bit down counting
 clocksource

Kukjin Kim wrote:
> Chanwoo Choi wrote:
>> Convert the S5PV210 32-bit down-counting clocksource to the generic
>> mmio clocksource infrastructure
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
>> ---
>>  arch/arm/Kconfig             |    1 +
>>  arch/arm/plat-s5p/s5p-time.c |   20 +++-----------------
>>  2 files changed, 4 insertions(+), 17 deletions(-)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index 9adc278..d7cd6f9 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -749,6 +749,7 @@ config ARCH_S5PV210
>>  	bool "Samsung S5PV210/S5PC110"
>>  	select CPU_V7
>>  	select ARCH_SPARSEMEM_ENABLE
>> +	select CLKSRC_MMIO
>>  	select GENERIC_GPIO
>>  	select HAVE_CLK
>>  	select ARM_L1_CACHE_SHIFT_6
>> diff --git a/arch/arm/plat-s5p/s5p-time.c b/arch/arm/plat-s5p/s5p-time.c
>> index 612934c..5666f55 100644
>> --- a/arch/arm/plat-s5p/s5p-time.c
>> +++ b/arch/arm/plat-s5p/s5p-time.c
>> @@ -314,13 +314,6 @@ static void __iomem *s5p_timer_reg(void)
>>  	return S3C_TIMERREG(offset);
>>  }
>>
>> -static cycle_t s5p_timer_read(struct clocksource *cs)
>> -{
>> -	void __iomem *reg = s5p_timer_reg();
>> -
>> -	return (cycle_t) (reg ? ~__raw_readl(reg) : 0);
>> -}
>> -
>>  /*
>>   * Override the global weak sched_clock symbol with this
>>   * local implementation which uses the clocksource to get some
>> @@ -350,14 +343,6 @@ static void notrace s5p_update_sched_clock(void)
>>  	update_sched_clock(&cd, ~__raw_readl(reg), (u32)~0);
>>  }
>>
>> -struct clocksource time_clocksource = {
>> -	.name		= "s5p_clocksource_timer",
>> -	.rating		= 250,
>> -	.read		= s5p_timer_read,
>> -	.mask		= CLOCKSOURCE_MASK(32),
>> -	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
>> -};
>> -
>>  static void __init s5p_clocksource_init(void)
>>  {
>>  	unsigned long pclk;
>> @@ -375,8 +360,9 @@ static void __init s5p_clocksource_init(void)
>>
>>  	init_sched_clock(&cd, s5p_update_sched_clock, 32, clock_rate);
>>
>> -	if (clocksource_register_hz(&time_clocksource, clock_rate))
>> -		panic("%s: can't register clocksource\n", time_clocksource.name);
>> +	if (clocksource_mmio_init(s5p_timer_reg(), "s5p_clocksource_timer",
>> +			clock_rate, 250, 32, clocksource_mmio_readl_down))
>> +		panic("s5p_clocksource_timer: can't register clocksource\n");
>>  }
>>
>>  static void __init s5p_timer_resources(void)
>> --
>> 1.7.0.4
> 
> The s5p-time is also used on S5P64X0, so CLKSRC_MMIO should be add in that.
> 
OK, I will repost the modified patch.

Thanks & Regards,
Chanwoo Choi
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