/* Start the tcw on the given subchannel. Return zero on success, non-zero otherwise.  */
int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
/* Start the tcw on the given subchannel. Return zero on success, non-zero otherwise.  */
int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
{
	int cc;
	union orb *orb = &to_io_private(sch)->orb;
	memset(orb, 0, sizeof(union orb));
	orb->tm.intparm = (u32) (addr_t) sch;
	orb->tm.key = key >> 4;
	orb->tm.b = 1;
	orb->tm.lpm = lpm ? lpm : sch->lpm;
	orb->tm.tcw = (u32) (addr_t) tcw;
	cc = ssch(sch->schid, orb);
	switch (cc) {
	case 0:
		return 0;
	case 1:
	case 2:
		return -EBUSY;
	default:
		return cio_start_handle_notoper(sch, lpm);
	}
}