FZA_RING_TX_MODE
writel_u(FZA_RING_TX_MODE, &buf->init.tx_mode);
#if ((FZA_RING_TX_MODE) != 0) && ((FZA_RING_TX_MODE) != 1)
#define FZA_RING_TX_SIZE (512 << (FZA_RING_TX_MODE))