1 // SPDX-License-Identifier: GPL-2.0
7  * Note1: This driver is 8250-like uart, but are not register compatible.
28 #include <linux/reset.h>
82 	writel(ch, port->membase + SUP_UART_DATA);  in sp_uart_put_char()
87 	unsigned int lsr = readl(port->membase + SUP_UART_LSR);  in sunplus_tx_buf_not_full()
94 	unsigned int lsr = readl(port->membase + SUP_UART_LSR);  in sunplus_tx_empty()
101 	unsigned int mcr = readl(port->membase + SUP_UART_MCR);  in sunplus_set_mctrl()
128 	writel(mcr, port->membase + SUP_UART_MCR);  in sunplus_set_mctrl()
135 	mcr = readl(port->membase + SUP_UART_MCR);  in sunplus_get_mctrl()
159 	isc = readl(port->membase + SUP_UART_ISC);  in sunplus_stop_tx()
161 	writel(isc, port->membase + SUP_UART_ISC);  in sunplus_stop_tx()
168 	isc = readl(port->membase + SUP_UART_ISC);  in sunplus_start_tx()
170 	writel(isc, port->membase + SUP_UART_ISC);  in sunplus_start_tx()
177 	isc = readl(port->membase + SUP_UART_ISC);  in sunplus_stop_rx()
179 	writel(isc, port->membase + SUP_UART_ISC);  in sunplus_stop_rx()
189 	lcr = readl(port->membase + SUP_UART_LCR);  in sunplus_break_ctl()
196 	writel(lcr, port->membase + SUP_UART_LCR);  in sunplus_break_ctl()
203 	struct tty_port *tport = &port->state->port;  in transmit_chars()
205 	if (port->x_char) {  in transmit_chars()
206 		sp_uart_put_char(port, port->x_char);  in transmit_chars()
207 		port->icount.tx++;  in transmit_chars()
208 		port->x_char = 0;  in transmit_chars()
212 	if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {  in transmit_chars()
226 	if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)  in transmit_chars()
229 	if (kfifo_is_empty(&tport->xmit_fifo))  in transmit_chars()
235 	unsigned int lsr = readl(port->membase + SUP_UART_LSR);  in receive_chars()
239 		ch = readl(port->membase + SUP_UART_DATA);  in receive_chars()
241 		port->icount.rx++;  in receive_chars()
246 				port->icount.brk++;  in receive_chars()
251 				port->icount.parity++;  in receive_chars()
254 				port->icount.frame++;  in receive_chars()
259 				port->icount.overrun++;  in receive_chars()
262 		if (port->ignore_status_mask & SUP_DUMMY_READ)  in receive_chars()
271 		lsr = readl(port->membase + SUP_UART_LSR);  in receive_chars()
274 	tty_flip_buffer_push(&port->state->port);  in receive_chars()
284 	isc = readl(port->membase + SUP_UART_ISC);  in sunplus_uart_irq()
303 	ret = request_irq(port->irq, sunplus_uart_irq, 0, "sunplus_uart", port);  in sunplus_startup()
313 	writel(isc, port->membase + SUP_UART_ISC);  in sunplus_startup()
328 	writel(0, port->membase + SUP_UART_ISC); /* disable all interrupt */  in sunplus_shutdown()
331 	free_irq(port->irq, port);  in sunplus_shutdown()
339 	u32 clk = port->uartclk;  in sunplus_set_termios()
342 	baud = uart_get_baud_rate(port, termios, oldtermios, 0, port->uartclk / 16);  in sunplus_set_termios()
348 	div = (div >> 4) - 1;  in sunplus_set_termios()
352 	switch (termios->c_cflag & CSIZE) {  in sunplus_set_termios()
367 	if (termios->c_cflag & CSTOPB)  in sunplus_set_termios()
370 	if (termios->c_cflag & PARENB) {  in sunplus_set_termios()
373 		if (!(termios->c_cflag & PARODD))  in sunplus_set_termios()
379 	uart_update_timeout(port, termios->c_cflag, baud);  in sunplus_set_termios()
381 	port->read_status_mask = 0;  in sunplus_set_termios()
382 	if (termios->c_iflag & INPCK)  in sunplus_set_termios()
383 		port->read_status_mask |= SUP_UART_LSR_PE | SUP_UART_LSR_FE;  in sunplus_set_termios()
385 	if (termios->c_iflag & (BRKINT | PARMRK))  in sunplus_set_termios()
386 		port->read_status_mask |= SUP_UART_LSR_BC;  in sunplus_set_termios()
389 	port->ignore_status_mask = 0;  in sunplus_set_termios()
390 	if (termios->c_iflag & IGNPAR)  in sunplus_set_termios()
391 		port->ignore_status_mask |= SUP_UART_LSR_FE | SUP_UART_LSR_PE;  in sunplus_set_termios()
393 	if (termios->c_iflag & IGNBRK) {  in sunplus_set_termios()
394 		port->ignore_status_mask |= SUP_UART_LSR_BC;  in sunplus_set_termios()
396 		if (termios->c_iflag & IGNPAR)  in sunplus_set_termios()
397 			port->ignore_status_mask |= SUP_UART_LSR_OE;  in sunplus_set_termios()
401 	if ((termios->c_cflag & CREAD) == 0) {  in sunplus_set_termios()
402 		port->ignore_status_mask |= SUP_DUMMY_READ;  in sunplus_set_termios()
404 		writel(0, port->membase + SUP_UART_RX_RESIDUE);  in sunplus_set_termios()
408 	writel(div_h, port->membase + SUP_UART_DIV_H);  in sunplus_set_termios()
409 	writel(div_l, port->membase + SUP_UART_DIV_L);  in sunplus_set_termios()
410 	writel(lcr, port->membase + SUP_UART_LCR);  in sunplus_set_termios()
417 	int new = termios->c_line;  in sunplus_set_ldisc()
420 		port->flags |= UPF_HARDPPS_CD;  in sunplus_set_ldisc()
422 		port->flags &= ~UPF_HARDPPS_CD;  in sunplus_set_ldisc()
427 	return port->type == PORT_SUNPLUS ? "sunplus_uart" : NULL;  in sunplus_type()
433 		port->type = PORT_SUNPLUS;  in sunplus_config_port()
438 	if (ser->type != PORT_UNKNOWN && ser->type != PORT_SUNPLUS)  in sunplus_verify_port()
439 		return -EINVAL;  in sunplus_verify_port()
451 	ret = readl_poll_timeout_atomic(port->membase + SUP_UART_LSR, val,  in wait_for_xmitr()
454 	if (ret == -ETIMEDOUT) {  in wait_for_xmitr()
455 		dev_err(port->dev, "Timeout waiting while UART TX FULL\n");  in wait_for_xmitr()
470 	unsigned int lsr = readl(port->membase + SUP_UART_LSR);  in sunplus_poll_get_char()
475 	return readl(port->membase + SUP_UART_DATA);  in sunplus_poll_get_char()
518 		locked = uart_port_trylock_irqsave(&sunplus_console_ports[co->index]->port, &flags);  in sunplus_console_write()
520 		uart_port_lock_irqsave(&sunplus_console_ports[co->index]->port, &flags);  in sunplus_console_write()
522 	uart_console_write(&sunplus_console_ports[co->index]->port, s, count,  in sunplus_console_write()
526 		uart_port_unlock_irqrestore(&sunplus_console_ports[co->index]->port, flags);  in sunplus_console_write()
537 	if (co->index < 0 || co->index >= SUP_UART_NR)  in sunplus_console_setup()
538 		return -EINVAL;  in sunplus_console_setup()
540 	sup = sunplus_console_ports[co->index];  in sunplus_console_setup()
542 		return -ENODEV;  in sunplus_console_setup()
547 	return uart_set_options(&sup->port, co, baud, parity, bits, flow);  in sunplus_console_setup()
557 	.index		= -1,
593 	pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");  in sunplus_uart_probe()
595 	if (pdev->id < 0 || pdev->id >= SUP_UART_NR)  in sunplus_uart_probe()
596 		return -EINVAL;  in sunplus_uart_probe()
598 	sup = devm_kzalloc(&pdev->dev, sizeof(*sup), GFP_KERNEL);  in sunplus_uart_probe()
600 		return -ENOMEM;  in sunplus_uart_probe()
602 	sup->clk = devm_clk_get_optional(&pdev->dev, NULL);  in sunplus_uart_probe()
603 	if (IS_ERR(sup->clk))  in sunplus_uart_probe()
604 		return dev_err_probe(&pdev->dev, PTR_ERR(sup->clk), "clk not found\n");  in sunplus_uart_probe()
606 	ret = clk_prepare_enable(sup->clk);  in sunplus_uart_probe()
610 	ret = devm_add_action_or_reset(&pdev->dev, sunplus_uart_disable_unprepare, sup->clk);  in sunplus_uart_probe()
614 	sup->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);  in sunplus_uart_probe()
615 	if (IS_ERR(sup->rstc))  in sunplus_uart_probe()
616 		return dev_err_probe(&pdev->dev, PTR_ERR(sup->rstc), "rstc not found\n");  in sunplus_uart_probe()
618 	port = &sup->port;  in sunplus_uart_probe()
620 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in sunplus_uart_probe()
621 	if (IS_ERR(port->membase))  in sunplus_uart_probe()
622 		return dev_err_probe(&pdev->dev, PTR_ERR(port->membase), "membase not found\n");  in sunplus_uart_probe()
628 	port->mapbase = res->start;  in sunplus_uart_probe()
629 	port->uartclk = clk_get_rate(sup->clk);  in sunplus_uart_probe()
630 	port->line = pdev->id;  in sunplus_uart_probe()
631 	port->irq = irq;  in sunplus_uart_probe()
632 	port->dev = &pdev->dev;  in sunplus_uart_probe()
633 	port->iotype = UPIO_MEM;  in sunplus_uart_probe()
634 	port->ops = &sunplus_uart_ops;  in sunplus_uart_probe()
635 	port->flags = UPF_BOOT_AUTOCONF;  in sunplus_uart_probe()
636 	port->fifosize = 128;  in sunplus_uart_probe()
638 	ret = reset_control_deassert(sup->rstc);  in sunplus_uart_probe()
642 	ret = devm_add_action_or_reset(&pdev->dev, sunplus_uart_reset_control_assert, sup->rstc);  in sunplus_uart_probe()
647 	sunplus_console_ports[sup->port.line] = sup;  in sunplus_uart_probe()
650 	platform_set_drvdata(pdev, &sup->port);  in sunplus_uart_probe()
652 	ret = uart_add_one_port(&sunplus_uart_driver, &sup->port);  in sunplus_uart_probe()
655 		sunplus_console_ports[sup->port.line] = NULL;  in sunplus_uart_probe()
665 	uart_remove_one_port(&sunplus_uart_driver, &sup->port);  in sunplus_uart_remove()
672 	if (!uart_console(&sup->port))  in sunplus_uart_suspend()
673 		uart_suspend_port(&sunplus_uart_driver, &sup->port);  in sunplus_uart_suspend()
682 	if (!uart_console(&sup->port))  in sunplus_uart_resume()
683 		uart_resume_port(&sunplus_uart_driver, &sup->port);  in sunplus_uart_resume()
693 	{ .compatible = "sunplus,sp7021-uart" },
737 	ret = readl_poll_timeout_atomic(port->membase + SUP_UART_LSR, val,  in sunplus_uart_putc()
742 	writel(c, port->membase + SUP_UART_DATA);  in sunplus_uart_putc()
747 	struct earlycon_device *dev = con->data;  in sunplus_uart_early_write()
749 	uart_console_write(&dev->port, s, n, sunplus_uart_putc);  in sunplus_uart_early_write()
755 	if (!(dev->port.membase || dev->port.iobase))  in sunplus_uart_early_setup()
756 		return -ENODEV;  in sunplus_uart_early_setup()
758 	dev->con->write = sunplus_uart_early_write;  in sunplus_uart_early_setup()
762 OF_EARLYCON_DECLARE(sunplus_uart, "sunplus,sp7021-uart", sunplus_uart_early_setup);