1 // SPDX-License-Identifier: GPL-2.0
46 #define CCR0_SSE		BIT(24)	/* SSn# Pin Function Enable */
47 #define CCR0_TEIE		BIT(21)	/* Transmit End Interrupt Enable */
48 #define CCR0_TIE		BIT(20)	/* Transmit Interrupt Enable */
49 #define CCR0_RIE		BIT(16)	/* Receive Interrupt Enable */
51 #define CCR0_DCME		BIT(9)	/* Data Compare Match Enable */
52 #define CCR0_MPIE		BIT(8)	/* Multiprocessor Interrupt Enable */
53 #define CCR0_TE			BIT(4)	/* Transmit Enable */
54 #define CCR0_RE			BIT(0)	/* Receive Enable */
58 #define CCR1_SHARPS		BIT(20)	/* Half -duplex Communication Select */
63 #define CCR1_PE			BIT(8)	/* Parity Enable */
66 #define CCR1_CTSPEN		BIT(1)	/* CTS External Pin Enable */
67 #define CCR1_CTSE		BIT(0)	/* CTS Enable */
90 #define SCxSR_ERRORS(port)	(to_sci_port(port)->params->error_mask)
91 #define SCxSR_ERROR_CLEAR(port)	(to_sci_port(port)->params->error_clear)
126 	return readl(p->membase + offset);  in rsci_serial_in()
131 	writel(value, p->membase + offset);  in rsci_serial_out()
147 	unsigned int ctrl;  in rsci_start_rx()  local
149 	ctrl = rsci_serial_in(port, CCR0);  in rsci_start_rx()
150 	ctrl |= CCR0_RIE;  in rsci_start_rx()
151 	rsci_serial_out(port, CCR0, ctrl);  in rsci_start_rx()
164 	if (termios->c_cflag & CREAD)  in rsci_set_termios()
210 	u32 ctrl;  in rsci_start_tx()  local
212 	if (sp->chan_tx)  in rsci_start_tx()
216 	 * TE (Transmit Enable) must be set after setting TIE  in rsci_start_tx()
217 	 * (Transmit Interrupt Enable) or in the same instruction  in rsci_start_tx()
220 	ctrl = rsci_serial_in(port, CCR0);  in rsci_start_tx()
221 	ctrl |= CCR0_TIE | CCR0_TE;  in rsci_start_tx()
222 	rsci_serial_out(port, CCR0, ctrl);  in rsci_start_tx()
227 	u32 ctrl;  in rsci_stop_tx()  local
229 	ctrl = rsci_serial_in(port, CCR0);  in rsci_stop_tx()
230 	ctrl &= ~CCR0_TIE;  in rsci_stop_tx()
231 	rsci_serial_out(port, CCR0, ctrl);  in rsci_stop_tx()
236 	u32 ctrl;  in rsci_stop_rx()  local
238 	ctrl = rsci_serial_in(port, CCR0);  in rsci_stop_rx()
239 	ctrl &= ~CCR0_RIE;  in rsci_stop_rx()
240 	rsci_serial_out(port, CCR0, ctrl);  in rsci_stop_rx()
245 	return port->fifosize - rsci_txfill(port);  in rsci_txroom()
251 	struct tty_port *tport = &port->state->port;  in rsci_transmit_chars()
252 	u32 status, ctrl;  in rsci_transmit_chars()  local
257 		ctrl = rsci_serial_in(port, CCR0);  in rsci_transmit_chars()
258 		if (kfifo_is_empty(&tport->xmit_fifo))  in rsci_transmit_chars()
259 			ctrl &= ~CCR0_TIE;  in rsci_transmit_chars()
261 			ctrl |= CCR0_TIE;  in rsci_transmit_chars()
262 		rsci_serial_out(port, CCR0, ctrl);  in rsci_transmit_chars()
271 		if (port->x_char) {  in rsci_transmit_chars()
272 			c = port->x_char;  in rsci_transmit_chars()
273 			port->x_char = 0;  in rsci_transmit_chars()
274 		} else if (stopped || !kfifo_get(&tport->xmit_fifo, &c)) {  in rsci_transmit_chars()
281 		port->icount.tx++;  in rsci_transmit_chars()
282 	} while (--count > 0);  in rsci_transmit_chars()
284 	if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)  in rsci_transmit_chars()
287 	if (kfifo_is_empty(&tport->xmit_fifo)) {  in rsci_transmit_chars()
288 		ctrl = rsci_serial_in(port, CCR0);  in rsci_transmit_chars()
289 		ctrl &= ~CCR0_TIE;  in rsci_transmit_chars()
290 		ctrl |= CCR0_TEIE;  in rsci_transmit_chars()
291 		rsci_serial_out(port, CCR0, ctrl);  in rsci_transmit_chars()
297 	struct tty_port *tport = &port->state->port;  in rsci_receive_chars()
320 			/* 9-bits data is not supported yet */  in rsci_receive_chars()
324 				count--;  in rsci_receive_chars()
325 				i--;  in rsci_receive_chars()
334 				port->icount.frame++;  in rsci_receive_chars()
337 				port->icount.parity++;  in rsci_receive_chars()
349 		port->icount.rx += count;  in rsci_receive_chars()
368 	ret = readl_relaxed_poll_timeout_atomic(port->membase + CSR, status,  in rsci_poll_put_char()
372 		dev_err(port->dev,  in rsci_poll_put_char()
381 static void rsci_prepare_console_write(struct uart_port *port, u32 ctrl)  in rsci_prepare_console_write()  argument
385 		s->params->param_bits->rxtx_enable | CCR0_TIE |  in rsci_prepare_console_write()
386 		s->hscif_tot;  in rsci_prepare_console_write()
475 OF_EARLYCON_DECLARE(rsci, "renesas,r9a09g077-rsci", rsci_early_console_setup);