Subject: Re: [PATCH v2] powernv: Add OPAL soft-poweroff routine

From: Vasant Hegde <[email-masked]>
Date: Mon, 09 Feb 2015 15:09:41 +0530

On 01/30/2015 12:13 PM, Joel Stanley wrote:
> Register a notifier for a OPAL message indicating that the machine
> should prepare itself for a graceful power off.
> 
> OPAL will tell us if the power off is a reboot or shutdown, but for now
> we perform the same orderly_poweroff action.
> 
> Signed-off-by: Joel Stanley <[email-masked]>
> ---
> v2:
>   - combine the reboot and off cases, as they are the same code
> 
>  arch/powerpc/include/asm/opal.h             |  2 +-
>  arch/powerpc/platforms/powernv/Makefile     |  2 +-
>  arch/powerpc/platforms/powernv/opal-power.c | 66 +++++++++++++++++++++++++++++
>  3 files changed, 68 insertions(+), 2 deletions(-)
>  create mode 100644 arch/powerpc/platforms/powernv/opal-power.c
> 
> diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
> index ca2dd45..cdf32c0 100644
> --- a/arch/powerpc/include/asm/opal.h
> +++ b/arch/powerpc/include/asm/opal.h
> @@ -250,7 +250,7 @@ enum OpalMessageType {
>  					 */
>  	OPAL_MSG_MEM_ERR,
>  	OPAL_MSG_EPOW,
> -	OPAL_MSG_SHUTDOWN,
> +	OPAL_MSG_SHUTDOWN,		/* params[0] = 1 reboot, 0 shutdown */
>  	OPAL_MSG_HMI_EVT,
>  	OPAL_MSG_TYPE_MAX,
>  };
> diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
> index f241acc..6f3c5d3 100644
> --- a/arch/powerpc/platforms/powernv/Makefile
> +++ b/arch/powerpc/platforms/powernv/Makefile
> @@ -1,7 +1,7 @@
>  obj-y			+= setup.o opal-wrappers.o opal.o opal-async.o
>  obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
>  obj-y			+= rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
> -obj-y			+= opal-msglog.o opal-hmi.o
> +obj-y			+= opal-msglog.o opal-hmi.o opal-power.o
>  
>  obj-$(CONFIG_SMP)	+= smp.o subcore.o subcore-asm.o
>  obj-$(CONFIG_PCI)	+= pci.o pci-p5ioc2.o pci-ioda.o
> diff --git a/arch/powerpc/platforms/powernv/opal-power.c b/arch/powerpc/platforms/powernv/opal-power.c
> new file mode 100644
> index 0000000..bbc1054
> --- /dev/null
> +++ b/arch/powerpc/platforms/powernv/opal-power.c
> @@ -0,0 +1,66 @@
> +/*
> + * PowerNV OPAL power control for graceful shutdown handling
> + *
> + * Copyright 2015 IBM Corp.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/reboot.h>
> +#include <linux/notifier.h>
> +
> +#include <asm/opal.h>
> +#include <asm/machdep.h>
> +
> +#define SOFT_OFF 0x00
> +#define SOFT_REBOOT 0x01

Better move these macros to opal.h as its coming from OPAL API?
Also I think its to merge this code and Anshumans' EPOW driver and create single
event file.

-Vasant