ARC_RC_OUTB_DOORBELL
ob_doorbell = arc_read(sc, ARC_RC_OUTB_DOORBELL);
reg = arc_read(sc, ARC_RC_OUTB_DOORBELL);
while ((reg = arc_read(sc, ARC_RC_OUTB_DOORBELL)) == 0)
if (arc_wait_eq(sc, ARC_RC_OUTB_DOORBELL, ARC_RC_I2D_MSG_CMD_DONE,
reg = arc_read(sc, ARC_RC_OUTB_DOORBELL);