powerpc: Convert power off logic to pm_power_off
authorAlexander Graf <agraf@suse.de>
Mon, 13 Oct 2014 14:01:09 +0000 (16:01 +0200)
committerMichael Ellerman <mpe@ellerman.id.au>
Mon, 3 Nov 2014 01:12:51 +0000 (12:12 +1100)
commit9178ba294b6839eeff1a91bed95515d783f3ee6c
tree61252a8808bba5208c7b7c0f0af31301278272de
parent0df1f2487d2f0d04703f142813d53615d62a1da4
powerpc: Convert power off logic to pm_power_off

The generic Linux framework to power off the machine is a function pointer
called pm_power_off. The trick about this pointer is that device drivers can
potentially implement it rather than board files.

Today on powerpc we set pm_power_off to invoke our generic full machine power
off logic which then calls ppc_md.power_off to invoke machine specific power
off.

However, when we want to add a power off GPIO via the "gpio-poweroff" driver,
this card house falls apart. That driver only registers itself if pm_power_off
is NULL to ensure it doesn't override board specific logic. However, since we
always set pm_power_off to the generic power off logic (which will just not
power off the machine if no ppc_md.power_off call is implemented), we can't
implement power off via the generic GPIO power off driver.

To fix this up, let's get rid of the ppc_md.power_off logic and just always use
pm_power_off as was intended. Then individual drivers such as the GPIO power off
driver can implement power off logic via that function pointer.

With this patch set applied and a few patches on top of QEMU that implement a
power off GPIO on the virt e500 machine, I can successfully turn off my virtual
machine after halt.

Signed-off-by: Alexander Graf <agraf@suse.de>
[mpe: Squash into one patch and update changelog based on cover letter]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
21 files changed:
arch/powerpc/include/asm/machdep.h
arch/powerpc/kernel/setup-common.c
arch/powerpc/platforms/44x/ppc476.c
arch/powerpc/platforms/52xx/efika.c
arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
arch/powerpc/platforms/85xx/corenet_generic.c
arch/powerpc/platforms/85xx/sgy_cts1000.c
arch/powerpc/platforms/cell/celleb_setup.c
arch/powerpc/platforms/cell/qpace_setup.c
arch/powerpc/platforms/cell/setup.c
arch/powerpc/platforms/chrp/setup.c
arch/powerpc/platforms/embedded6xx/gamecube.c
arch/powerpc/platforms/embedded6xx/linkstation.c
arch/powerpc/platforms/embedded6xx/wii.c
arch/powerpc/platforms/maple/setup.c
arch/powerpc/platforms/powermac/setup.c
arch/powerpc/platforms/powernv/setup.c
arch/powerpc/platforms/ps3/setup.c
arch/powerpc/platforms/pseries/setup.c
arch/powerpc/sysdev/fsl_soc.c
arch/powerpc/xmon/xmon.c