[PATCH v2 5/7] ARM: highbank: add SMP support

[Shawn Guo]

On Wed, Aug 31, 2011 at 08:44:04PM -0500, Rob Herring wrote:
> From: Rob Herring <rob.herring at calxeda.com>
> 
> This enables SMP support on highbank processor.
> 
> Signed-off-by: Rob Herring <rob.herring at calxeda.com>
> ---
> Changes in v2:
>  - drop NULL check of scu_base
>  - use IPI #0 instead of #1 to boot secondary
>  - s/a9_base_addr/scu_base_addr/
>  - fix muliple mapping of twd registers
> 
>  arch/arm/Kconfig                    |    2 +-
>  arch/arm/mach-highbank/Makefile     |    2 +
>  arch/arm/mach-highbank/localtimer.c |   38 +++++++++++++++++
>  arch/arm/mach-highbank/platsmp.c    |   78 +++++++++++++++++++++++++++++++++++
>  4 files changed, 119 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/mach-highbank/localtimer.c
>  create mode 100644 arch/arm/mach-highbank/platsmp.c
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 9019a56..6d2add5 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1372,7 +1372,7 @@ config SMP
>  	depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
>  		 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
>  		 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
> -		 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE
> +		 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK
>  	select USE_GENERIC_SMP_HELPERS
>  	select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
>  	help
> diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
> index 11d4010..311c0e8e 100644
> --- a/arch/arm/mach-highbank/Makefile
> +++ b/arch/arm/mach-highbank/Makefile
> @@ -1,2 +1,4 @@
>  obj-y					:= clock.o highbank.o system.o
>  obj-$(CONFIG_DEBUG_LL)			+= lluart.o
> +obj-$(CONFIG_SMP)			+= platsmp.o
> +obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
> diff --git a/arch/arm/mach-highbank/localtimer.c b/arch/arm/mach-highbank/localtimer.c
> new file mode 100644
> index 0000000..344ea29
> --- /dev/null
> +++ b/arch/arm/mach-highbank/localtimer.c
> @@ -0,0 +1,38 @@
> +/*
> + * Copyright 2010-2011 Calxeda, Inc.
> + * Based on localtimer.c, Copyright (C) 2002 ARM Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <linux/init.h>
> +#include <linux/clockchips.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +
> +#include <asm/smp_twd.h>
> +
> +/*
> + * Setup the local clock events for a CPU.
> + */
> +int __cpuinit local_timer_setup(struct clock_event_device *evt)
> +{
> +	struct device_node *np;
> +
> +	np = of_find_compatible_node(NULL, NULL, "arm,smp-twd");
> +	if (!twd_base)
> +		twd_base = of_iomap(np, 0);

WARN_ON(!twd_base)?

Regards,
Shawn

> +	evt->irq = irq_of_parse_and_map(np, 0);
> +	twd_timer_setup(evt);
> +	return 0;
> +}