linux-kernel - Re: [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

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Date:	Fri, 25 Apr 2014 10:00:30 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Chanwoo Choi <cw00.choi@...sung.com>, kgene.kim@...sung.com,
	t.figa@...sung.com
CC:	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	ben-linux@...ff.org, arnd@...db.de, olof@...om.net,
	marc.zyngier@....com, thomas.abraham@...aro.org,
	kyungmin.park@...sung.com, inki.dae@...sung.com,
	sw0312.kim@...sung.com, hyunhee.kim@...sung.com,
	yj44.cho@...sung.com, chanho61.park@...sung.com,
	sajjan.linux@...il.com, sachin.kamat@...aro.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

On 04/25/2014 06:46 AM, Chanwoo Choi wrote:
> This patch fix the offset of CPU boot address and don't need to send smc call
> of SMC_CMD_CPU1BOOT command for secondary CPU boot because Exynos3250 removes
> WFE in secure mode.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> ---
>  arch/arm/mach-exynos/firmware.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
> index aa01c42..386d01d 100644
> --- a/arch/arm/mach-exynos/firmware.c
> +++ b/arch/arm/mach-exynos/firmware.c
> @@ -31,11 +31,17 @@ static int exynos_do_idle(void)
>  static int exynos_cpu_boot(int cpu)
>  {
>  	/*
> +	 * Exynos3250 doesn't need to send smc command for secondary CPU boot
> +	 * because Exynos3250 removes WFE in secure mode.
> +	 */
> +	if (soc_is_exynos3250())
> +		return 0;
> +	/*
>  	 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
>  	 * But, Exynos4212 has only one secondary CPU so second parameter
>  	 * isn't used for informing secure firmware about CPU id.
>  	 */
> -	if (soc_is_exynos4212())
> +	else if (soc_is_exynos4212())

This changes is not required.

>  		cpu = 0;
>  
>  	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
> @@ -46,7 +52,7 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
>  {
>  	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c;
>  
> -	if (!soc_is_exynos4212())
> +	if (!soc_is_exynos4212() && !soc_is_exynos3250())
>  		boot_reg += 4*cpu;
>  
>  	__raw_writel(boot_addr, boot_reg);
> 


-- 
Tushar Behera
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