WAVCACHE_CHCTL_ADDRTAG_MASK
wcreg = (ch->phys - 16) & WAVCACHE_CHCTL_ADDRTAG_MASK;
wcreg = (ch->srcphys - 16) & WAVCACHE_CHCTL_ADDRTAG_MASK;
wcreg2 = (ch->base - 16) & WAVCACHE_CHCTL_ADDRTAG_MASK;
wcreg = (ch->phys - 16) & WAVCACHE_CHCTL_ADDRTAG_MASK;
wcreg2 = (ch->base - 16) & WAVCACHE_CHCTL_ADDRTAG_MASK;