That was a long time and several drivers ago ;-)
There are some helper functions for that now.
omap_mcbsp_dma_reg_param(unsigned int id, unsigned int stream)
omap_mcbsp_dma_ch_params(unsigned int id, unsigned int stream)
For example, here's accessing the RX dma info from a recent driver
wrf.dma_rx_reg = omap_mcbsp_dma_reg_params(OMAP_MCBSP3, 1);
wrf.dma_rx_sync = omap_mcbsp_dma_ch_params(OMAP_MCBSP3, 1);
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