601 	struct circ_buf *ring = &atmel_port->rx_ring;  in atmel_buffer_rx_char()  local
604 	if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))  in atmel_buffer_rx_char()
608 	c = &((struct atmel_uart_char *)ring->buf)[ring->head];  in atmel_buffer_rx_char()
615 	ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1);  in atmel_buffer_rx_char()
929 	struct circ_buf *ring = &atmel_port->rx_ring;  in atmel_rx_from_dma()  local
962 	ring->head = sg_dma_len(&atmel_port->sg_rx) - state.residue;  in atmel_rx_from_dma()
963 	BUG_ON(ring->head > sg_dma_len(&atmel_port->sg_rx));  in atmel_rx_from_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()
990 		if (ring->head >= sg_dma_len(&atmel_port->sg_rx))  in atmel_rx_from_dma()
991 			ring->head = 0;  in atmel_rx_from_dma()
992 		ring->tail = ring->head;  in atmel_rx_from_dma()
1019 	struct circ_buf		*ring;  in atmel_prepare_rx_dma()  local
1022 	ring = &atmel_port->rx_ring;  in atmel_prepare_rx_dma()
1036 	BUG_ON(!PAGE_ALIGNED(ring->buf));  in atmel_prepare_rx_dma()
1038 		    virt_to_page(ring->buf),  in atmel_prepare_rx_dma()
1040 		    (int)ring->buf & ~PAGE_MASK);  in atmel_prepare_rx_dma()
1052 			ring->buf,  in atmel_prepare_rx_dma()
1320 	struct circ_buf *ring = &atmel_port->rx_ring;  in atmel_rx_from_ring()  local
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()