drivers/spi/spi-bcm2835.c

97  * @tx_prologue: bytes transmitted without DMA if first TX sglist entry's
101  * @tx_spillover: whether @tx_prologue spills over to second TX sglist entry
132 	int tx_prologue;
493 	bs->tx_prologue  = 0;
498 		bs->tx_prologue = sg_dma_len(&tfr->tx_sg.sgl[0]) & 3;
503 		if (bs->rx_prologue > bs->tx_prologue) {
505 				bs->tx_prologue  = bs->rx_prologue;
507 				bs->tx_prologue += 4;
514 	/* rx_prologue > 0 implies tx_prologue > 0, so check only the latter */
515 	if (!bs->tx_prologue)
545 	tx_remaining = bs->tx_prologue - bs->rx_prologue;
557 		sg_dma_address(&tfr->tx_sg.sgl[0]) += bs->tx_prologue;
558 		sg_dma_len(&tfr->tx_sg.sgl[0])     -= bs->tx_prologue;
578 	if (!bs->tx_prologue)
590 		sg_dma_address(&tfr->tx_sg.sgl[0]) -= bs->tx_prologue;
591 		sg_dma_len(&tfr->tx_sg.sgl[0])     += bs->tx_prologue;
593 		sg_dma_len(&tfr->tx_sg.sgl[0])      = bs->tx_prologue - 4;
598 	bs->tx_prologue = 0;