1 // SPDX-License-Identifier: GPL-2.0
3  * MPS2 UART driver
27 #define DRIVER_NAME	"mps2-uart"
87 	writeb(val, mps_port->port.membase + off);  in mps2_uart_write8()
94 	return readb(mps_port->port.membase + off);  in mps2_uart_read8()
101 	writel_relaxed(val, mps_port->port.membase + off);  in mps2_uart_write32()
147 	 * We've just unmasked the TX IRQ and now slow-starting via  in mps2_uart_start_tx()
150 	 * point we switch to fully interrupt-driven TX.  in mps2_uart_start_tx()
171 	struct tty_port *tport = &port->state->port;  in mps2_uart_rx_chars()
176 		port->icount.rx++;  in mps2_uart_rx_chars()
177 		tty_insert_flip_char(&port->state->port, rxdata, TTY_NORMAL);  in mps2_uart_rx_chars()
228 		struct tty_port *tport = &port->state->port;  in mps2_uart_oerrirq()
231 		port->icount.overrun++;  in mps2_uart_oerrirq()
276 	if (mps_port->flags & UART_PORT_COMBINED_IRQ) {  in mps2_uart_startup()
277 		ret = request_irq(port->irq, mps2_uart_combinedirq, 0,  in mps2_uart_startup()
278 				  MAKE_NAME(-combined), mps_port);  in mps2_uart_startup()
281 			dev_err(port->dev, "failed to register combinedirq (%d)\n", ret);  in mps2_uart_startup()
285 		ret = request_irq(port->irq, mps2_uart_oerrirq, IRQF_SHARED,  in mps2_uart_startup()
286 				  MAKE_NAME(-overrun), mps_port);  in mps2_uart_startup()
289 			dev_err(port->dev, "failed to register oerrirq (%d)\n", ret);  in mps2_uart_startup()
293 		ret = request_irq(mps_port->rx_irq, mps2_uart_rxirq, 0,  in mps2_uart_startup()
294 				  MAKE_NAME(-rx), mps_port);  in mps2_uart_startup()
296 			dev_err(port->dev, "failed to register rxirq (%d)\n", ret);  in mps2_uart_startup()
300 		ret = request_irq(mps_port->tx_irq, mps2_uart_txirq, 0,  in mps2_uart_startup()
301 				  MAKE_NAME(-tx), mps_port);  in mps2_uart_startup()
303 			dev_err(port->dev, "failed to register txirq (%d)\n", ret);  in mps2_uart_startup()
316 	free_irq(mps_port->rx_irq, mps_port);  in mps2_uart_startup()
318 	free_irq(port->irq, mps_port);  in mps2_uart_startup()
332 	if (!(mps_port->flags & UART_PORT_COMBINED_IRQ)) {  in mps2_uart_shutdown()
333 		free_irq(mps_port->rx_irq, mps_port);  in mps2_uart_shutdown()
334 		free_irq(mps_port->tx_irq, mps_port);  in mps2_uart_shutdown()
337 	free_irq(port->irq, mps_port);  in mps2_uart_shutdown()
347 	termios->c_cflag &= ~(CRTSCTS | CMSPAR);  in mps2_uart_set_termios()
348 	termios->c_cflag &= ~CSIZE;  in mps2_uart_set_termios()
349 	termios->c_cflag |= CS8;  in mps2_uart_set_termios()
350 	termios->c_cflag &= ~PARENB;  in mps2_uart_set_termios()
351 	termios->c_cflag &= ~CSTOPB;  in mps2_uart_set_termios()
354 			DIV_ROUND_CLOSEST(port->uartclk, UARTn_BAUDDIV_MASK),  in mps2_uart_set_termios()
355 			DIV_ROUND_CLOSEST(port->uartclk, 16));  in mps2_uart_set_termios()
357 	bauddiv = DIV_ROUND_CLOSEST(port->uartclk, baud);  in mps2_uart_set_termios()
361 	uart_update_timeout(port, termios->c_cflag, baud);  in mps2_uart_set_termios()
372 	return (port->type == PORT_MPS2UART) ? DRIVER_NAME : NULL;  in mps2_uart_type()
387 		port->type = PORT_MPS2UART;  in mps2_uart_config_port()
392 	return -EINVAL;  in mps2_uart_verify_port()
426 	struct mps2_uart_port *mps_port = idr_find(&ports_idr, co->index);  in mps2_uart_console_write()
427 	struct uart_port *port = &mps_port->port;  in mps2_uart_console_write()
440 	if (co->index < 0 || co->index >= MPS2_MAX_PORTS)  in mps2_uart_console_setup()
441 		return -ENODEV;  in mps2_uart_console_setup()
443 	mps_port = idr_find(&ports_idr, co->index);  in mps2_uart_console_setup()
446 		return -ENODEV;  in mps2_uart_console_setup()
451 	return uart_set_options(&mps_port->port, co, baud, parity, bits, flow);  in mps2_uart_console_setup()
462 	.index = -1,
470 	while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL)  in mps2_early_putchar()
473 	writeb((unsigned char)ch, port->membase + UARTn_DATA);  in mps2_early_putchar()
478 	struct earlycon_device *dev = con->data;  in mps2_early_write()
480 	uart_console_write(&dev->port, s, n, mps2_early_putchar);  in mps2_early_write()
486 	if (!device->port.membase)  in mps2_early_console_setup()
487 		return -ENODEV;  in mps2_early_console_setup()
489 	device->con->write = mps2_early_write;  in mps2_early_console_setup()
494 OF_EARLYCON_DECLARE(mps2, "arm,mps2-uart", mps2_early_console_setup);
510 	struct device_node *np = pdev->dev.of_node;  in mps2_of_get_port()
514 		return -ENODEV;  in mps2_of_get_port()
528 		mps_port->flags |= UART_PORT_COMBINED_IRQ;  in mps2_of_get_port()
530 	mps_port->port.line = id;  in mps2_of_get_port()
541 	mps_port->port.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in mps2_init_port()
542 	if (IS_ERR(mps_port->port.membase))  in mps2_init_port()
543 		return PTR_ERR(mps_port->port.membase);  in mps2_init_port()
545 	mps_port->port.mapbase = res->start;  in mps2_init_port()
546 	mps_port->port.mapsize = resource_size(res);  in mps2_init_port()
547 	mps_port->port.iotype = UPIO_MEM;  in mps2_init_port()
548 	mps_port->port.flags = UPF_BOOT_AUTOCONF;  in mps2_init_port()
549 	mps_port->port.fifosize = 1;  in mps2_init_port()
550 	mps_port->port.ops = &mps2_uart_pops;  in mps2_init_port()
551 	mps_port->port.dev = &pdev->dev;  in mps2_init_port()
553 	mps_port->clk = devm_clk_get(&pdev->dev, NULL);  in mps2_init_port()
554 	if (IS_ERR(mps_port->clk))  in mps2_init_port()
555 		return PTR_ERR(mps_port->clk);  in mps2_init_port()
557 	ret = clk_prepare_enable(mps_port->clk);  in mps2_init_port()
561 	mps_port->port.uartclk = clk_get_rate(mps_port->clk);  in mps2_init_port()
563 	clk_disable_unprepare(mps_port->clk);  in mps2_init_port()
566 	if (mps_port->flags & UART_PORT_COMBINED_IRQ) {  in mps2_init_port()
567 		mps_port->port.irq = platform_get_irq(pdev, 0);  in mps2_init_port()
569 		mps_port->rx_irq = platform_get_irq(pdev, 0);  in mps2_init_port()
570 		mps_port->tx_irq = platform_get_irq(pdev, 1);  in mps2_init_port()
571 		mps_port->port.irq = platform_get_irq(pdev, 2);  in mps2_init_port()
582 	mps_port = devm_kzalloc(&pdev->dev, sizeof(struct mps2_uart_port), GFP_KERNEL);  in mps2_serial_probe()
585                 return -ENOMEM;  in mps2_serial_probe()
595 	ret = uart_add_one_port(&mps2_uart_driver, &mps_port->port);  in mps2_serial_probe()
606 	{ .compatible = "arm,mps2-uart", },