DUART_CHANREG_SPACING
(A_DUART + DUART_CHANREG_SPACING * ((chan) + 1) + (reg))
(A_DUART + DUART_CHANREG_SPACING * 3 + (reg))
release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING);
release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
DUART_CHANREG_SPACING);
DUART_CHANREG_SPACING);
if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING,
if (!request_mem_region(duart->mapctrl, DUART_CHANREG_SPACING,
DUART_CHANREG_SPACING);
release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);