From mboxrd@z Thu Jan  1 00:00:00 1970
From: mark.rutland@arm.com (Mark Rutland)
Date: Tue, 9 Apr 2013 10:27:11 +0100
Subject: [PATCH 01/02] ARM: shmobile: force enable of r8a7790 arch timer
In-Reply-To: <20130408012328.13555.44487.sendpatchset@w520>
References: <20130408012318.13555.58237.sendpatchset@w520>
 <20130408012328.13555.44487.sendpatchset@w520>
Message-ID: <20130409092711.GT23725@e106331-lin.cambridge.arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Adding Stephen Boyd and Marc Zyngier to Cc as they're both familiar with the
architected timer.

On Mon, Apr 08, 2013 at 02:23:28AM +0100, Magnus Damm wrote:
> From: Magnus Damm <damm@opensource.se>
> 
> Implement a SoC-specific timer init function for
> r8a7790 that makes sure the architected timer
> is started regardless of boot loader setting.
> 
> Signed-off-by: Magnus Damm <damm@opensource.se>
> ---
> 
>  arch/arm/mach-shmobile/include/mach/r8a7790.h |    1 +
>  arch/arm/mach-shmobile/setup-r8a7790.c        |   14 +++++++++++++-
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> --- 0001/arch/arm/mach-shmobile/include/mach/r8a7790.h
> +++ work/arch/arm/mach-shmobile/include/mach/r8a7790.h	2013-04-08 10:13:38.000000000 +0900
> @@ -4,5 +4,6 @@
>  void r8a7790_add_standard_devices(void);
>  void r8a7790_clock_init(void);
>  void r8a7790_pinmux_init(void);
> +void r8a7790_timer_init(void);
>  
>  #endif /* __ASM_R8A7790_H__ */
> --- 0001/arch/arm/mach-shmobile/setup-r8a7790.c
> +++ work/arch/arm/mach-shmobile/setup-r8a7790.c	2013-04-08 10:13:38.000000000 +0900
> @@ -117,6 +117,18 @@ void __init r8a7790_add_standard_devices
>  	r8a7790_register_irqc(0);
>  }
>  
> +void __init r8a7790_timer_init(void)
> +{
> +	void __iomem *cntcr;
> +
> +	/* make sure arch timer is started by setting bit 0 of CNTCT */

Typo: CNTCT should be CNTCR above.

> +	cntcr = ioremap(0xe6080000, PAGE_SIZE);
> +	iowrite32(1, cntcr);
> +	iounmap(cntcr);
> +
> +	shmobile_timer_init();
> +}

Does this mean you have memory-mapped timers and CP15 timers linked together?

Why do your firmware and bootloader not set this up?

Mark.