301 	struct circ_buf *xmit = &port->state->xmit;  in stm32_transmit_chars_pio()  local
320 	writel_relaxed(xmit->buf[xmit->tail], port->membase + ofs->tdr);  in stm32_transmit_chars_pio()
321 	xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);  in stm32_transmit_chars_pio()
329 	struct circ_buf *xmit = &port->state->xmit;  in stm32_transmit_chars_dma()  local
339 	count = uart_circ_chars_pending(xmit);  in stm32_transmit_chars_dma()
344 	if (xmit->tail < xmit->head) {  in stm32_transmit_chars_dma()
345 		memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], count);  in stm32_transmit_chars_dma()
347 		size_t one = UART_XMIT_SIZE - xmit->tail;  in stm32_transmit_chars_dma()
354 		memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], one);  in stm32_transmit_chars_dma()
356 			memcpy(&stm32port->tx_buf[one], &xmit->buf[0], two);  in stm32_transmit_chars_dma()
383 	xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);  in stm32_transmit_chars_dma()
391 	struct circ_buf *xmit = &port->state->xmit;  in stm32_transmit_chars()  local
409 	if (uart_circ_empty(xmit)) {  in stm32_transmit_chars()
419 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)  in stm32_transmit_chars()
422 	if (uart_circ_empty(xmit))  in stm32_transmit_chars()
507 	struct circ_buf *xmit = &port->state->xmit;  in stm32_start_tx()  local
509 	if (uart_circ_empty(xmit))  in stm32_start_tx()