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[S390] pm: chsc subchannel driver power management callbacks 

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2009-06-16 10:30:24 +02:00 committed by Martin Schwidefsky
parent 93a275921d
commit ad285ae9fc
1 changed files with 31 additions and 1 deletions
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32
drivers/s390/cio/chsc_sch.c
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@ -1,7 +1,8 @@
/*
* Driver for s390 chsc subchannels
*
* Copyright IBM Corp. 2008
* Copyright IBM Corp. 2008, 2009
*
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*
*/
@ -112,6 +113,31 @@ static void chsc_subchannel_shutdown(struct subchannel *sch)
cio_disable_subchannel(sch);
}
static int chsc_subchannel_prepare(struct subchannel *sch)
{
int cc;
struct schib schib;
/*
* Don't allow suspend while the subchannel is not idle
* since we don't have a way to clear the subchannel and
* cannot disable it with a request running.
*/
cc = stsch(sch->schid, &schib);
if (!cc && scsw_stctl(&schib.scsw))
return -EAGAIN;
return 0;
}
static int chsc_subchannel_freeze(struct subchannel *sch)
{
return cio_disable_subchannel(sch);
}
static int chsc_subchannel_restore(struct subchannel *sch)
{
return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
}
static struct css_device_id chsc_subchannel_ids[] = {
{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
{ /* end of list */ },
@ -125,6 +151,10 @@ static struct css_driver chsc_subchannel_driver = {
.probe = chsc_subchannel_probe,
.remove = chsc_subchannel_remove,
.shutdown = chsc_subchannel_shutdown,
.prepare = chsc_subchannel_prepare,
.freeze = chsc_subchannel_freeze,
.thaw = chsc_subchannel_restore,
.restore = chsc_subchannel_restore,
.name = "chsc_subchannel",
};