linux-kernel - Re: [PATCH 6/8] x86/platform: add a wallclock_init func to x86

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Date:	Tue, 11 May 2010 16:42:20 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Alek Du <alek.du@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Feng Tang <feng.tang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/8] x86/platform: add a wallclock_init func to x86_platforms
 ops

On Fri, 7 May 2010, Jacob Pan wrote:

> From: Feng Tang <feng.tang@...el.com>
> 
> Some wall clock devices use MMIO based HW register, this new function will
> give them a chance to do some initialization work before their get/set_time
> service get called.
> 
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  arch/x86/include/asm/x86_init.h |    2 ++
>  arch/x86/kernel/setup.c         |    2 ++
>  arch/x86/kernel/x86_init.c      |    2 ++
>  3 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
> index 519b543..be027a8 100644
> --- a/arch/x86/include/asm/x86_init.h
> +++ b/arch/x86/include/asm/x86_init.h
> @@ -138,6 +138,7 @@ struct x86_cpuinit_ops {
>  /**
>   * struct x86_platform_ops - platform specific runtime functions
>   * @calibrate_tsc:		calibrate TSC
> + * @wallclock_init:		init the wallclock device


  wallclock_init is an init function and should be in x86_init.timers

>   * @get_wallclock:		get time from HW clock like RTC etc.
>   * @set_wallclock:		set time back to HW clock
>   * @is_untracked_pat_range	exclude from PAT logic
> @@ -145,6 +146,7 @@ struct x86_cpuinit_ops {
>   */
>  struct x86_platform_ops {
>  	unsigned long (*calibrate_tsc)(void);
> +	void (*wallclock_init)(void);
>  	unsigned long (*get_wallclock)(void);
>  	int (*set_wallclock)(unsigned long nowtime);
>  	void (*iommu_shutdown)(void);
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index c4851ef..d001d8c 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1050,6 +1050,8 @@ void __init setup_arch(char **cmdline_p)
>  #endif
>  	x86_init.oem.banner();
>  
> +	x86_platform.wallclock_init();
> +
>  	mcheck_init();
>  }
>  
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index 61a1e8c..ee00d76 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -24,6 +24,7 @@ void __init x86_init_uint_noop(unsigned int unused) { }
>  void __init x86_init_pgd_noop(pgd_t *unused) { }
>  int __init iommu_init_noop(void) { return 0; }
>  void iommu_shutdown_noop(void) { }
> +void wallclock_init_noop(void) { }

No need for that.

Thanks,

	tglx
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