1 // SPDX-License-Identifier: GPL-2.0+
36 /* MA35_IER_REG - Interrupt Enable Register */
40 #define MA35_IER_RTO_IEN	BIT(4)  /* RX Time-out Interrupt Enable */
42 #define MA35_IER_TIME_OUT_EN	BIT(11) /* RX Buffer Time-out Counter Enable */
43 #define MA35_IER_AUTO_RTS	BIT(12) /* nRTS Auto-flow Control Enable */
44 #define MA35_IER_AUTO_CTS	BIT(13) /* nCTS Auto-flow Control Enable */
46 /* MA35_FCR_REG - FIFO Control Register */
62 /* MA35_LCR_REG - Line Control Register */
74 /* MA35_MCR_REG - Modem Control Register */
79 /* MA35_MSR_REG - Modem Status Register */
84 /* MA35_FSR_REG - FIFO Status Register */
98 /* MA35_ISR_REG - Interrupt Status Register */
103 #define MA35_ISR_RXTO_IF	BIT(4)  /* RX Time-out Interrupt Flag */
105 #define MA35_ISR_WK_IF		BIT(6)  /* UART Wake-up Interrupt Flag */
110 /* MA35_BAUD_REG - Baud Rate Divider Register */
117 /* MA35_ALTCTL_REG - Alternate Control/Status Register */
118 #define MA35_ALTCTL_RS485AUD	BIT(10) /* RS-485 Auto Direction Function */
120 /* MA35_FUN_SEL_REG - Function Select Register */
125 /* The constrain for MA35D1 UART baud rate divider */
170 	return readl_relaxed(p->port.membase + offset);  in serial_in()
175 	writel_relaxed(value, p->port.membase + offset);  in serial_out()
199 	if (uart_tx_stopped(&up->port)) {  in transmit_chars()
200 		ma35d1serial_stop_tx(&up->port);  in transmit_chars()
203 	count = MA35_UART_FIFO_DEPTH - FIELD_GET(MA35_FSR_TXPTR_MSK,  in transmit_chars()
205 	uart_port_tx_limited(&up->port, ch, count,  in transmit_chars()
241 		up->port.icount.rx++;  in receive_chars()
246 				up->port.icount.brk++;  in receive_chars()
247 				if (uart_handle_break(&up->port))  in receive_chars()
251 				up->port.icount.frame++;  in receive_chars()
253 				up->port.icount.parity++;  in receive_chars()
255 				up->port.icount.overrun++;  in receive_chars()
269 		if (uart_handle_sysrq_char(&up->port, ch))  in receive_chars()
272 		uart_port_lock(&up->port);  in receive_chars()
273 		uart_insert_char(&up->port, fsr, MA35_FSR_RX_OVER_IF, ch, flag);  in receive_chars()
274 		uart_port_unlock(&up->port);  in receive_chars()
277 	} while (!(fsr & MA35_FSR_RX_EMPTY) && (max_count-- > 0));  in receive_chars()
279 	uart_port_lock(&up->port);  in receive_chars()
280 	tty_flip_buffer_push(&up->port.state->port);  in receive_chars()
281 	uart_port_unlock(&up->port);  in receive_chars()
343 	if (up->mcr & UART_MCR_AFE) {  in ma35d1serial_set_mctrl()
347 		up->port.flags |= UPF_HARD_FLOW;  in ma35d1serial_set_mctrl()
352 		up->port.flags &= ~UPF_HARD_FLOW;  in ma35d1serial_set_mctrl()
367 	uart_port_lock_irqsave(&up->port, &flags);  in ma35d1serial_break_ctl()
374 	uart_port_unlock_irqrestore(&up->port, flags);  in ma35d1serial_break_ctl()
389 	retval = request_irq(port->irq, ma35d1serial_interrupt, 0,  in ma35d1serial_startup()
390 			     dev_name(port->dev), port);  in ma35d1serial_startup()
392 		dev_err(up->port.dev, "request irq failed.\n");  in ma35d1serial_startup()
410 	free_irq(port->irq, port);  in ma35d1serial_shutdown()
419 	u32 baud, quot;  in ma35d1serial_set_termios()  local
422 	lcr = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));  in ma35d1serial_set_termios()
424 	if (termios->c_cflag & CSTOPB)  in ma35d1serial_set_termios()
426 	if (termios->c_cflag & PARENB)  in ma35d1serial_set_termios()
428 	if (!(termios->c_cflag & PARODD))  in ma35d1serial_set_termios()
430 	if (termios->c_cflag & CMSPAR)  in ma35d1serial_set_termios()
433 	baud = uart_get_baud_rate(port, termios, old,  in ma35d1serial_set_termios()
434 				  port->uartclk / MA35_BAUD_DIV_MAX,  in ma35d1serial_set_termios()
435 				  port->uartclk / MA35_BAUD_DIV_MIN);  in ma35d1serial_set_termios()
437 	/* MA35D1 UART baud rate equation: baudrate = UART_CLK / (quot + 2) */  in ma35d1serial_set_termios()
438 	quot = (port->uartclk / baud) - 2;  in ma35d1serial_set_termios()
444 	uart_port_lock_irqsave(&up->port, &flags);  in ma35d1serial_set_termios()
446 	up->port.read_status_mask = MA35_FSR_RX_OVER_IF;  in ma35d1serial_set_termios()
447 	if (termios->c_iflag & INPCK)  in ma35d1serial_set_termios()
448 		up->port.read_status_mask |= MA35_FSR_FEF | MA35_FSR_PEF;  in ma35d1serial_set_termios()
449 	if (termios->c_iflag & (BRKINT | PARMRK))  in ma35d1serial_set_termios()
450 		up->port.read_status_mask |= MA35_FSR_BIF;  in ma35d1serial_set_termios()
453 	up->port.ignore_status_mask = 0;  in ma35d1serial_set_termios()
454 	if (termios->c_iflag & IGNPAR)  in ma35d1serial_set_termios()
455 		up->port.ignore_status_mask |= MA35_FSR_FEF | MA35_FSR_PEF;  in ma35d1serial_set_termios()
456 	if (termios->c_iflag & IGNBRK) {  in ma35d1serial_set_termios()
457 		up->port.ignore_status_mask |= MA35_FSR_BIF;  in ma35d1serial_set_termios()
462 		if (termios->c_iflag & IGNPAR)  in ma35d1serial_set_termios()
463 			up->port.ignore_status_mask |= MA35_FSR_RX_OVER_IF;  in ma35d1serial_set_termios()
465 	if (termios->c_cflag & CRTSCTS)  in ma35d1serial_set_termios()
466 		up->mcr |= UART_MCR_AFE;  in ma35d1serial_set_termios()
468 		up->mcr &= ~UART_MCR_AFE;  in ma35d1serial_set_termios()
470 	uart_update_timeout(port, termios->c_cflag, baud);  in ma35d1serial_set_termios()
472 	ma35d1serial_set_mctrl(&up->port, up->port.mctrl);  in ma35d1serial_set_termios()
478 	uart_port_unlock_irqrestore(&up->port, flags);  in ma35d1serial_set_termios()
483 	return "ma35d1-uart";  in ma35d1serial_type()
489 	 * Driver core for serial ports forces a non-zero value for port type.  in ma35d1serial_config_port()
493 	port->type = 1;  in ma35d1serial_config_port()
498 	if (port->type != PORT_UNKNOWN && ser->type != 1)  in ma35d1serial_verify_port()
499 		return -EINVAL;  in ma35d1serial_verify_port()
521 	{ .compatible = "nuvoton,ma35d1-uart" },
560 	if ((co->index < 0) || (co->index >= MA35_UART_NR)) {  in ma35d1serial_console_write()
562 			co->index);  in ma35d1serial_console_write()
566 	up = &ma35d1serial_ports[co->index];  in ma35d1serial_console_write()
568 	if (up->port.sysrq)  in ma35d1serial_console_write()
571 		locked = uart_port_trylock_irqsave(&up->port, &flags);  in ma35d1serial_console_write()
573 		uart_port_lock_irqsave(&up->port, &flags);  in ma35d1serial_console_write()
581 	uart_console_write(&up->port, s, count, ma35d1serial_console_putchar);  in ma35d1serial_console_write()
587 		uart_port_unlock_irqrestore(&up->port, flags);  in ma35d1serial_console_write()
596 	int baud = 115200;  in ma35d1serial_console_setup()  local
601 	if ((co->index < 0) || (co->index >= MA35_UART_NR)) {  in ma35d1serial_console_setup()
602 		pr_debug("Console Port%x out of range\n", co->index);  in ma35d1serial_console_setup()
603 		return -EINVAL;  in ma35d1serial_console_setup()
606 	np = ma35d1serial_uart_nodes[co->index];  in ma35d1serial_console_setup()
607 	p = &ma35d1serial_ports[co->index];  in ma35d1serial_console_setup()
609 		return -ENODEV;  in ma35d1serial_console_setup()
612 		return -EINVAL;  in ma35d1serial_console_setup()
614 	p->port.iobase = val32[1];  in ma35d1serial_console_setup()
615 	p->port.membase = ioremap(p->port.iobase, MA35_UART_REG_SIZE);  in ma35d1serial_console_setup()
616 	if (!p->port.membase)  in ma35d1serial_console_setup()
617 		return -ENOMEM;  in ma35d1serial_console_setup()
619 	p->port.ops = &ma35d1serial_ops;  in ma35d1serial_console_setup()
620 	p->port.line = 0;  in ma35d1serial_console_setup()
621 	p->port.uartclk = MA35_UART_CONSOLE_CLK;  in ma35d1serial_console_setup()
623 	port = &ma35d1serial_ports[co->index].port;  in ma35d1serial_console_setup()
626 		uart_parse_options(options, &baud, &parity, &bits, &flow);  in ma35d1serial_console_setup()
628 	return uart_set_options(port, co, baud, parity, bits, flow);  in ma35d1serial_console_setup()
637 	.index   = -1,
691 	if (!pdev->dev.of_node)  in ma35d1serial_probe()
692 		return -ENODEV;  in ma35d1serial_probe()
694 	ret = of_alias_get_id(pdev->dev.of_node, "serial");  in ma35d1serial_probe()
696 		dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);  in ma35d1serial_probe()
700 	up->port.line = ret;  in ma35d1serial_probe()
703 		return -ENODEV;  in ma35d1serial_probe()
705 	up->port.iobase = res_mem->start;  in ma35d1serial_probe()
706 	up->port.membase = ioremap(up->port.iobase, MA35_UART_REG_SIZE);  in ma35d1serial_probe()
707 	if (!up->port.membase)  in ma35d1serial_probe()
708 		return -ENOMEM;  in ma35d1serial_probe()
710 	up->port.ops = &ma35d1serial_ops;  in ma35d1serial_probe()
712 	spin_lock_init(&up->port.lock);  in ma35d1serial_probe()
714 	up->clk = of_clk_get(pdev->dev.of_node, 0);  in ma35d1serial_probe()
715 	if (IS_ERR(up->clk)) {  in ma35d1serial_probe()
716 		ret = PTR_ERR(up->clk);  in ma35d1serial_probe()
717 		dev_err(&pdev->dev, "failed to get core clk: %d\n", ret);  in ma35d1serial_probe()
721 	ret = clk_prepare_enable(up->clk);  in ma35d1serial_probe()
725 	if (up->port.line != 0)  in ma35d1serial_probe()
726 		up->port.uartclk = clk_get_rate(up->clk);  in ma35d1serial_probe()
732 	up->port.irq = ret;  in ma35d1serial_probe()
733 	up->port.dev = &pdev->dev;  in ma35d1serial_probe()
734 	up->port.flags = UPF_BOOT_AUTOCONF;  in ma35d1serial_probe()
738 	ret = uart_add_one_port(&ma35d1serial_reg, &up->port);  in ma35d1serial_probe()
745 	free_irq(up->port.irq, &up->port);  in ma35d1serial_probe()
748 	clk_disable_unprepare(up->clk);  in ma35d1serial_probe()
751 	iounmap(up->port.membase);  in ma35d1serial_probe()
764 	clk_disable_unprepare(up->clk);  in ma35d1serial_remove()
772 	uart_suspend_port(&ma35d1serial_reg, &up->port);  in ma35d1serial_suspend()
773 	if (up->port.line == 0) {  in ma35d1serial_suspend()
774 		up->console_baud_rate = serial_in(up, MA35_BAUD_REG);  in ma35d1serial_suspend()
775 		up->console_line = serial_in(up, MA35_LCR_REG);  in ma35d1serial_suspend()
776 		up->console_int = serial_in(up, MA35_IER_REG);  in ma35d1serial_suspend()
786 	if (up->port.line == 0) {  in ma35d1serial_resume()
787 		serial_out(up, MA35_BAUD_REG, up->console_baud_rate);  in ma35d1serial_resume()
788 		serial_out(up, MA35_LCR_REG, up->console_line);  in ma35d1serial_resume()
789 		serial_out(up, MA35_IER_REG, up->console_int);  in ma35d1serial_resume()
791 	uart_resume_port(&ma35d1serial_reg, &up->port);  in ma35d1serial_resume()
801 		.name   = "ma35d1-uart",