[PATCH v2 7/7] ARM: highbank: add suspend support
Rob Herring
robherring2 at gmail.com
Thu Sep 1 17:39:06 EDT 2011
Shawn,
On 09/01/2011 07:22 AM, Shawn Guo wrote:
> On Wed, Aug 31, 2011 at 08:44:06PM -0500, Rob Herring wrote:
>> From: Rob Herring <rob.herring at calxeda.com>
>>
>> Add the platform suspend ops for highbank.
>>
>> Signed-off-by: Rob Herring <rob.herring at calxeda.com>
>> ---
>> Changes in v2:
>> - s/a9_base_addr/scu_base_addr/
>> - use sysregs helper functions
>> - add __init to highbank_pm_init
>>
>> arch/arm/mach-highbank/Makefile | 1 +
>> arch/arm/mach-highbank/pm.c | 55 +++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 56 insertions(+), 0 deletions(-)
>> create mode 100644 arch/arm/mach-highbank/pm.c
>>
>> diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
>> index df30b0d..daeb3d8 100644
>> --- a/arch/arm/mach-highbank/Makefile
>> +++ b/arch/arm/mach-highbank/Makefile
>> @@ -3,3 +3,4 @@ obj-$(CONFIG_DEBUG_LL) += lluart.o
>> obj-$(CONFIG_SMP) += platsmp.o
>> obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
>> obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
>> +obj-$(CONFIG_PM_SLEEP) += pm.o
>> diff --git a/arch/arm/mach-highbank/pm.c b/arch/arm/mach-highbank/pm.c
>> new file mode 100644
>> index 0000000..33b3beb
>> --- /dev/null
>> +++ b/arch/arm/mach-highbank/pm.c
>> @@ -0,0 +1,55 @@
>> +/*
>> + * Copyright 2011 Calxeda, Inc.
>> + *
>> + * 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/io.h>
>> +#include <linux/suspend.h>
>> +
>> +#include <asm/proc-fns.h>
>> +#include <asm/smp_scu.h>
>> +#include <asm/suspend.h>
>> +
>> +#include "core.h"
>> +#include "sysregs.h"
>> +
>> +static int highbank_suspend_finish(unsigned long val)
>> +{
>> + cpu_do_idle();
>> + return 0;
>> +}
>> +
>> +static int highbank_pm_enter(suspend_state_t state)
>> +{
>> + hignbank_set_pwr_suspend();
>> + highbank_set_cpu_jump(0, cpu_resume);
>> +
>> + scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
>> + cpu_suspend(0, highbank_suspend_finish);
>> +
> Rob,
>
> Just out of curiosity, how can you resume back without taking care of
> GIC, L2 and SCU which will lose power during suspend?
>
They are not powergated yet, so it's really just wfi ATM. The L2 and SCU
will be re-initialized by boot code. The GIC will need some save and
restore.
Rob
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