646 	if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))  in atmel_buffer_rx_char()
751 		atmel_uart_write_char(port, xmit->buf[xmit->tail]);  in atmel_tx_chars()
752 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);  in atmel_tx_chars()
779 	xmit->tail += atmel_port->tx_len;  in atmel_complete_tx_dma()
780 	xmit->tail &= UART_XMIT_SIZE - 1;  in atmel_complete_tx_dma()
849 					 xmit->tail,  in atmel_tx_dma()
864 		phys_addr = sg_dma_address(sg_tx) + xmit->tail;  in atmel_tx_dma()
1055 	if (ring->head < ring->tail) {  in atmel_rx_from_dma()
1056 		count = sg_dma_len(&atmel_port->sg_rx) - ring->tail;  in atmel_rx_from_dma()
1058 		tty_insert_flip_string(tport, ring->buf + ring->tail, count);  in atmel_rx_from_dma()
1059 		ring->tail = 0;  in atmel_rx_from_dma()
1064 	if (ring->tail < ring->head) {  in atmel_rx_from_dma()
1065 		count = ring->head - ring->tail;  in atmel_rx_from_dma()
1067 		tty_insert_flip_string(tport, ring->buf + ring->tail, count);  in atmel_rx_from_dma()
1071 		ring->tail = ring->head;  in atmel_rx_from_dma()
1346 	xmit->tail += pdc->ofs;  in atmel_tx_pdc()
1347 	xmit->tail &= UART_XMIT_SIZE - 1;  in atmel_tx_pdc()
1363 		count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);  in atmel_tx_pdc()
1367 				  pdc->dma_addr + xmit->tail);  in atmel_tx_pdc()
1410 	while (ring->head != ring->tail) {  in atmel_rx_from_ring()
1416 		c = ((struct atmel_uart_char *)ring->buf)[ring->tail];  in atmel_rx_from_ring()
1418 		ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1);  in atmel_rx_from_ring()
1494 	unsigned int tail;  in atmel_rx_from_pdc()  local
1503 		tail = pdc->ofs;  in atmel_rx_from_pdc()
1517 		if (likely(head != tail)) {  in atmel_rx_from_pdc()
1527 			count = head - tail;  in atmel_rx_from_pdc()
2022 	atmel_port->rx_ring.tail = 0;  in atmel_shutdown()