RTEMS | bsp/aarch64/raspberrypi: Add support for DMA (!662)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on bsps/aarch64/raspberrypi/dma/raspberrypi-dma.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/662#note_128957

 > +  ) = CS_WAIT_FOR_OUTSTANDING_WRITES | CS_PANIC_PRIORITY_SHIFT |
 > +      CS_PRIORITY_SHIFT;
 > +  BCM2835_REG( base_address + CS_OFFSET ) |= CS_ACTIVE;
 > +  return RTEMS_SUCCESSFUL;
 > +}
 > +
 > +rtems_status_code rpi_dma_wait( rpi_dma_channel channel )
 > +{
 > +  uint32_t base_address = get_base_address(channel);
 > +  if(!base_address){
 > +    return RTEMS_INVALID_NUMBER;
 > +  }
 > +  while (( BCM2835_REG( base_address + CS_OFFSET ) & CS_ACTIVE ));
 > +
 > +  if ( BCM2835_REG( base_address + CS_OFFSET ) & CS_ERROR ) {
 > +    return RTEMS_UNSATISFIED;

These error return paths do not free the control block.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/662#note_128957
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