linux-kernel - RE: [PATCHv4 2/7] ARM: EXYNOS: Support secondary CPU boot of Exynos4212

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Date:	Sat, 26 Apr 2014 19:49:13 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Tomasz Figa' <tomasz.figa@...il.com>,
	'Chanwoo Choi' <cw00.choi@...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, tushar.behera@...aro.org,
	sachin.kamat@...aro.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: RE: [PATCHv4 2/7] ARM: EXYNOS: Support secondary CPU boot of Exynos4212

Tomasz Figa wrote:
> 
> Hi,
> 
Hi,

> On 25.04.2014 03:16, Chanwoo Choi wrote:
> > From: Kyungmin Park <kyungmin.park@...sung.com>
> >
> > This patch fix the offset of CPU boot address and change parameter of
> smc call
> > of SMC_CMD_CPU1BOOT command for Exynos4212.
> >
> > Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> > Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> > ---
> >   arch/arm/mach-exynos/firmware.c | 15 ++++++++++++++-
> >   1 file changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-
> exynos/firmware.c
> > index 932129e..aa01c42 100644
> > --- a/arch/arm/mach-exynos/firmware.c
> > +++ b/arch/arm/mach-exynos/firmware.c
> > @@ -18,6 +18,8 @@
> >
> >   #include <mach/map.h>
> >
> > +#include <plat/cpu.h>
> > +
> >   #include "smc.h"
> >
> >   static int exynos_do_idle(void)
> > @@ -28,13 +30,24 @@ static int exynos_do_idle(void)
> >
> >   static int exynos_cpu_boot(int cpu)
> >   {
> > +	/*
> > +	 * 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())
> > +		cpu = 0;
> > +
> >   	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
> >   	return 0;
> >   }
> >
> >   static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
> >   {
> > -	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
> > +	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c;
> > +
> > +	if (!soc_is_exynos4212())
> > +		boot_reg += 4*cpu;
> >
> >   	__raw_writel(boot_addr, boot_reg);
> >   	return 0;
> >
> 
> This patch should be applied independently of Exynos3250 support.
> Kukjin, what do you think?
> 
Yes, this should be separated. I will pick this into fixes.

> Anyway,
> 
> Reviewed-by: Tomasz Figa <t.figa@...sung.com>
> 
Thanks,
Kukjin

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