604 	if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))  in atmel_buffer_rx_char()
705 		UART_PUT_CHAR(port, xmit->buf[xmit->tail]);  in atmel_tx_chars()
706 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);  in atmel_tx_chars()
732 	xmit->tail += sg_dma_len(&atmel_port->sg_tx);  in atmel_complete_tx_dma()
733 	xmit->tail &= UART_XMIT_SIZE - 1;  in atmel_complete_tx_dma()
799 		sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);  in atmel_tx_dma()
804 						xmit->tail,  in atmel_tx_dma()
976 	if (ring->head < ring->tail) {  in atmel_rx_from_dma()
977 		count = sg_dma_len(&atmel_port->sg_rx) - ring->tail;  in atmel_rx_from_dma()
979 		tty_insert_flip_string(tport, ring->buf + ring->tail, count);  in atmel_rx_from_dma()
980 		ring->tail = 0;  in atmel_rx_from_dma()
985 	if (ring->tail < ring->head) {  in atmel_rx_from_dma()
986 		count = ring->head - ring->tail;  in atmel_rx_from_dma()
988 		tty_insert_flip_string(tport, ring->buf + ring->tail, count);  in atmel_rx_from_dma()
992 		ring->tail = ring->head;  in atmel_rx_from_dma()
1262 	xmit->tail += pdc->ofs;  in atmel_tx_pdc()
1263 	xmit->tail &= UART_XMIT_SIZE - 1;  in atmel_tx_pdc()
1279 		count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);  in atmel_tx_pdc()
1282 		UART_PUT_TPR(port, pdc->dma_addr + xmit->tail);  in atmel_tx_pdc()
1324 	while (ring->head != ring->tail) {  in atmel_rx_from_ring()
1330 		c = ((struct atmel_uart_char *)ring->buf)[ring->tail];  in atmel_rx_from_ring()
1332 		ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1);  in atmel_rx_from_ring()
1408 	unsigned int tail;  in atmel_rx_from_pdc()  local
1417 		tail = pdc->ofs;  in atmel_rx_from_pdc()
1431 		if (likely(head != tail)) {  in atmel_rx_from_pdc()
1441 			count = head - tail;  in atmel_rx_from_pdc()
1910 	atmel_port->rx_ring.tail = 0;  in atmel_shutdown()