Commit ad285ae9 authored by Cornelia Huck's avatar Cornelia Huck Committed by Martin Schwidefsky
Browse files

[S390] pm: chsc subchannel driver power management callbacks 



Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 93a27592

drivers/s390/cio/chsc_sch.c

+31 −1
Original line number Diff line number Diff line 
/*

 * 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",

};