Changing DMA stread read to stream write

I can change it from read to write by doing the following:

IOWR_32DIRECT(DMA_TESTER_BASE, 24,0x2FC);

printf("WRITE_DMA_CONTROL_REG: 0X%8X\n", IORD_32DIRECT(DMA_TESTER_BASE, 24));

But then it messes up the read transfers, so I need to do this via the drivers in stead of the registers (like it says in the datasheet)

From the datasheet (Embedded Peripherals IP User Guide) :

if your program uses the hal device driver to access the dma controller, accessing the device registers directly interferes with the correct behavior of the driver.

If I change it to this:

alt_dma_txchan_ioctl(txchan, ALT_DMA_SET_MODE_32, null);

alt_dma_txchan_ioctl(txchan, ALT_DMA_TX_ONLY_ON, tx_data);

alt_dma_txchan_ioctl(txchan, ALT_DMA_RX_ONLY_OFF, null);

and

alt_dma_rxchan_ioctl(rxchan, ALT_DMA_SET_MODE_32, null);

alt_dma_rxchan_ioctl(rxchan, ALT_DMA_RX_ONLY_OFF, null);

alt_dma_rxchan_ioctl(rxchan, ALT_DMA_TX_ONLY_OFF, null);

the register simple remains at FC and I get a normal memory copy...