HPIC_CLEAR
hrowpic_write_reg(sc, HPIC_CLEAR, HPIC_PRIMARY, 0xffffffff);
hrowpic_write_reg(sc, HPIC_CLEAR, HPIC_SECONDARY, 0xffffffff);
hrowpic_write_reg(sc, HPIC_CLEAR, bank, 1U << (irq & 0x1f));