1 // SPDX-License-Identifier: GPL-2.0+
8  * Copyright (c) 2016-2017 Andreas Färber
86 	writel(val, port->membase + off);  in owl_uart_write()
91 	return readl(port->membase + off);  in owl_uart_read()
205 			port->icount.overrun++;  in owl_uart_receive_chars()
209 			port->icount.brk++;  in owl_uart_receive_chars()
210 			port->icount.frame++;  in owl_uart_receive_chars()
212 			stat &= port->read_status_mask;  in owl_uart_receive_chars()
216 			port->icount.rx++;  in owl_uart_receive_chars()
223 		if (!sysrq && (stat & port->ignore_status_mask) == 0)  in owl_uart_receive_chars()
224 			tty_insert_flip_char(&port->state->port, val, flag);  in owl_uart_receive_chars()
229 	tty_flip_buffer_push(&port->state->port);  in owl_uart_receive_chars()
270 	free_irq(port->irq, port);  in owl_uart_shutdown()
279 	ret = request_irq(port->irq, owl_uart_irq, IRQF_TRIGGER_HIGH,  in owl_uart_startup()
280 			"owl-uart", port);  in owl_uart_startup()
304 	clk_set_rate(owl_port->clk, baud * 8);  in owl_uart_change_baudrate()
321 	switch (termios->c_cflag & CSIZE) {  in owl_uart_set_termios()
337 	if (termios->c_cflag & CSTOPB)  in owl_uart_set_termios()
343 	if (termios->c_cflag & PARENB) {  in owl_uart_set_termios()
344 		if (termios->c_cflag & CMSPAR) {  in owl_uart_set_termios()
345 			if (termios->c_cflag & PARODD)  in owl_uart_set_termios()
349 		} else if (termios->c_cflag & PARODD)  in owl_uart_set_termios()
356 	if (termios->c_cflag & CRTSCTS)  in owl_uart_set_termios()
370 	port->read_status_mask |= OWL_UART_STAT_RXER;  in owl_uart_set_termios()
371 	if (termios->c_iflag & INPCK)  in owl_uart_set_termios()
372 		port->read_status_mask |= OWL_UART_STAT_RXST;  in owl_uart_set_termios()
374 	uart_update_timeout(port, termios->c_cflag, baud);  in owl_uart_set_termios()
381 	struct platform_device *pdev = to_platform_device(port->dev);  in owl_uart_release_port()
388 	if (port->flags & UPF_IOREMAP) {  in owl_uart_release_port()
389 		devm_release_mem_region(port->dev, port->mapbase,  in owl_uart_release_port()
391 		devm_iounmap(port->dev, port->membase);  in owl_uart_release_port()
392 		port->membase = NULL;  in owl_uart_release_port()
398 	struct platform_device *pdev = to_platform_device(port->dev);  in owl_uart_request_port()
403 		return -ENXIO;  in owl_uart_request_port()
405 	if (!devm_request_mem_region(port->dev, port->mapbase,  in owl_uart_request_port()
406 			resource_size(res), dev_name(port->dev)))  in owl_uart_request_port()
407 		return -EBUSY;  in owl_uart_request_port()
409 	if (port->flags & UPF_IOREMAP) {  in owl_uart_request_port()
410 		port->membase = devm_ioremap(port->dev, port->mapbase,  in owl_uart_request_port()
412 		if (!port->membase)  in owl_uart_request_port()
413 			return -EBUSY;  in owl_uart_request_port()
421 	return (port->type == PORT_OWL) ? "owl-uart" : NULL;  in owl_uart_type()
427 	if (port->type != PORT_OWL)  in owl_uart_verify_port()
428 		return -EINVAL;  in owl_uart_verify_port()
430 	if (port->irq != ser->irq)  in owl_uart_verify_port()
431 		return -EINVAL;  in owl_uart_verify_port()
439 		port->type = PORT_OWL;  in owl_uart_config_port()
460 	ret = readl_poll_timeout_atomic(port->membase + OWL_UART_STAT, reg,  in owl_uart_poll_put_char()
464 	if (ret == -ETIMEDOUT) {  in owl_uart_poll_put_char()
465 		dev_err(port->dev, "Timeout waiting while UART TX FULL\n");  in owl_uart_poll_put_char()
499 	if (!port->membase)  in owl_console_putchar()
548 	owl_port = owl_uart_ports[co->index];  in owl_uart_console_write()
552 	owl_uart_port_write(&owl_port->port, s, count);  in owl_uart_console_write()
563 	if (co->index < 0 || co->index >= OWL_UART_PORT_NUM)  in owl_uart_console_setup()
564 		return -EINVAL;  in owl_uart_console_setup()
566 	owl_port = owl_uart_ports[co->index];  in owl_uart_console_setup()
567 	if (!owl_port || !owl_port->port.membase)  in owl_uart_console_setup()
568 		return -ENODEV;  in owl_uart_console_setup()
573 	return uart_set_options(&owl_port->port, co, baud, parity, bits, flow);  in owl_uart_console_setup()
582 	.index = -1,
598 	struct earlycon_device *dev = co->data;  in owl_uart_early_console_write()
600 	owl_uart_port_write(&dev->port, s, count);  in owl_uart_early_console_write()
606 	if (!device->port.membase)  in owl_uart_early_console_setup()
607 		return -ENODEV;  in owl_uart_early_console_setup()
609 	device->con->write = owl_uart_early_console_write;  in owl_uart_early_console_setup()
613 OF_EARLYCON_DECLARE(owl, "actions,owl-uart",
623 	.driver_name = "owl-uart",
638 	{ .compatible = "actions,s500-uart", .data = &owl_s500_info },
639 	{ .compatible = "actions,s900-uart", .data = &owl_s900_info },
652 	if (pdev->dev.of_node) {  in owl_uart_probe()
653 		pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");  in owl_uart_probe()
654 		match = of_match_node(owl_uart_dt_matches, pdev->dev.of_node);  in owl_uart_probe()
656 			info = match->data;  in owl_uart_probe()
659 	if (pdev->id < 0 || pdev->id >= OWL_UART_PORT_NUM) {  in owl_uart_probe()
660 		dev_err(&pdev->dev, "id %d out of range\n", pdev->id);  in owl_uart_probe()
661 		return -EINVAL;  in owl_uart_probe()
666 		dev_err(&pdev->dev, "could not get mem\n");  in owl_uart_probe()
667 		return -ENODEV;  in owl_uart_probe()
674 	if (owl_uart_ports[pdev->id]) {  in owl_uart_probe()
675 		dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);  in owl_uart_probe()
676 		return -EBUSY;  in owl_uart_probe()
679 	owl_port = devm_kzalloc(&pdev->dev, sizeof(*owl_port), GFP_KERNEL);  in owl_uart_probe()
681 		return -ENOMEM;  in owl_uart_probe()
683 	owl_port->clk = devm_clk_get(&pdev->dev, NULL);  in owl_uart_probe()
684 	if (IS_ERR(owl_port->clk)) {  in owl_uart_probe()
685 		dev_err(&pdev->dev, "could not get clk\n");  in owl_uart_probe()
686 		return PTR_ERR(owl_port->clk);  in owl_uart_probe()
689 	ret = clk_prepare_enable(owl_port->clk);  in owl_uart_probe()
691 		dev_err(&pdev->dev, "could not enable clk\n");  in owl_uart_probe()
695 	owl_port->port.dev = &pdev->dev;  in owl_uart_probe()
696 	owl_port->port.line = pdev->id;  in owl_uart_probe()
697 	owl_port->port.type = PORT_OWL;  in owl_uart_probe()
698 	owl_port->port.iotype = UPIO_MEM;  in owl_uart_probe()
699 	owl_port->port.mapbase = res_mem->start;  in owl_uart_probe()
700 	owl_port->port.irq = irq;  in owl_uart_probe()
701 	owl_port->port.uartclk = clk_get_rate(owl_port->clk);  in owl_uart_probe()
702 	if (owl_port->port.uartclk == 0) {  in owl_uart_probe()
703 		dev_err(&pdev->dev, "clock rate is zero\n");  in owl_uart_probe()
704 		clk_disable_unprepare(owl_port->clk);  in owl_uart_probe()
705 		return -EINVAL;  in owl_uart_probe()
707 	owl_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;  in owl_uart_probe()
708 	owl_port->port.x_char = 0;  in owl_uart_probe()
709 	owl_port->port.fifosize = (info) ? info->tx_fifosize : 16;  in owl_uart_probe()
710 	owl_port->port.ops = &owl_uart_ops;  in owl_uart_probe()
712 	owl_uart_ports[pdev->id] = owl_port;  in owl_uart_probe()
715 	ret = uart_add_one_port(&owl_uart_driver, &owl_port->port);  in owl_uart_probe()
717 		owl_uart_ports[pdev->id] = NULL;  in owl_uart_probe()
726 	uart_remove_one_port(&owl_uart_driver, &owl_port->port);  in owl_uart_remove()
727 	owl_uart_ports[pdev->id] = NULL;  in owl_uart_remove()
728 	clk_disable_unprepare(owl_port->clk);  in owl_uart_remove()
735 		.name = "owl-uart",