wc_wrreg
static void wc_wrreg(struct agg_info*, u_int16_t, u_int16_t);
wc_wrreg(ess, ch << 3, data);
wc_wrreg(ess, data, ess->phys >> WAVCACHE_BASEADDR_SHIFT);
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 1,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 2,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 3,