1 // SPDX-License-Identifier: GPL-2.0
102 	val = readl(port->membase + AML_UART_STATUS);  in meson_uart_tx_empty()
111 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_stop_tx()
113 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_stop_tx()
120 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_stop_rx()
122 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_stop_rx()
130 	free_irq(port->irq, port);  in meson_uart_shutdown()
132 	spin_lock_irqsave(&port->lock, flags);  in meson_uart_shutdown()
134 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_shutdown()
137 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_shutdown()
139 	spin_unlock_irqrestore(&port->lock, flags);  in meson_uart_shutdown()
144 	struct circ_buf *xmit = &port->state->xmit;  in meson_uart_start_tx()
153 	while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {  in meson_uart_start_tx()
154 		if (port->x_char) {  in meson_uart_start_tx()
155 			writel(port->x_char, port->membase + AML_UART_WFIFO);  in meson_uart_start_tx()
156 			port->icount.tx++;  in meson_uart_start_tx()
157 			port->x_char = 0;  in meson_uart_start_tx()
164 		ch = xmit->buf[xmit->tail];  in meson_uart_start_tx()
165 		writel(ch, port->membase + AML_UART_WFIFO);  in meson_uart_start_tx()
170 		val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_start_tx()
172 		writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_start_tx()
181 	struct tty_port *tport = &port->state->port;  in meson_receive_chars()
187 		port->icount.rx++;  in meson_receive_chars()
188 		ostatus = status = readl(port->membase + AML_UART_STATUS);  in meson_receive_chars()
192 				port->icount.overrun++;  in meson_receive_chars()
194 				port->icount.frame++;  in meson_receive_chars()
196 				port->icount.frame++;  in meson_receive_chars()
198 			mode = readl(port->membase + AML_UART_CONTROL);  in meson_receive_chars()
200 			writel(mode, port->membase + AML_UART_CONTROL);  in meson_receive_chars()
204 			writel(mode, port->membase + AML_UART_CONTROL);  in meson_receive_chars()
206 			status &= port->read_status_mask;  in meson_receive_chars()
213 		ch = readl(port->membase + AML_UART_RFIFO);  in meson_receive_chars()
217 			port->icount.brk++;  in meson_receive_chars()
226 		if ((status & port->ignore_status_mask) == 0)  in meson_receive_chars()
232 	} while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY));  in meson_receive_chars()
241 	spin_lock(&port->lock);  in meson_uart_interrupt()
243 	if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY))  in meson_uart_interrupt()
246 	if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {  in meson_uart_interrupt()
247 		if (readl(port->membase + AML_UART_CONTROL) & AML_UART_TX_INT_EN)  in meson_uart_interrupt()
251 	spin_unlock(&port->lock);  in meson_uart_interrupt()
258 	return (port->type == PORT_MESON) ? "meson_uart" : NULL;  in meson_uart_type()
266  * function to acquire the port->lock. (Since there is no console on this
267  * port at this time, the port->lock is not initialized yet.)
273 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_reset()
275 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_reset()
278 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_reset()
287 	spin_lock_irqsave(&port->lock, flags);  in meson_uart_startup()
289 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_startup()
291 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_startup()
293 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_startup()
296 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_startup()
299 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_startup()
301 	val = (AML_UART_RECV_IRQ(1) | AML_UART_XMIT_IRQ(port->fifosize / 2));  in meson_uart_startup()
302 	writel(val, port->membase + AML_UART_MISC);  in meson_uart_startup()
304 	spin_unlock_irqrestore(&port->lock, flags);  in meson_uart_startup()
306 	ret = request_irq(port->irq, meson_uart_interrupt, 0,  in meson_uart_startup()
307 			  port->name, port);  in meson_uart_startup()
314 	const struct meson_uart_data *private_data = port->private_data;  in meson_uart_change_speed()
320 	if (port->uartclk == 24000000) {  in meson_uart_change_speed()
323 		if (private_data && private_data->has_xtal_div2) {  in meson_uart_change_speed()
327 		val |= DIV_ROUND_CLOSEST(port->uartclk / xtal_div, baud) - 1;  in meson_uart_change_speed()
330 		val =  DIV_ROUND_CLOSEST(port->uartclk / 4, baud) - 1;  in meson_uart_change_speed()
333 	writel(val, port->membase + AML_UART_REG5);  in meson_uart_change_speed()
344 	spin_lock_irqsave(&port->lock, flags);  in meson_uart_set_termios()
346 	cflags = termios->c_cflag;  in meson_uart_set_termios()
347 	iflags = termios->c_iflag;  in meson_uart_set_termios()
349 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_set_termios()
384 		if (port->flags & UPF_HARD_FLOW)  in meson_uart_set_termios()
387 			termios->c_cflag &= ~CRTSCTS;  in meson_uart_set_termios()
392 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_set_termios()
397 	port->read_status_mask = AML_UART_TX_FIFO_WERR;  in meson_uart_set_termios()
399 		port->read_status_mask |= AML_UART_PARITY_ERR |  in meson_uart_set_termios()
402 	port->ignore_status_mask = 0;  in meson_uart_set_termios()
404 		port->ignore_status_mask |= AML_UART_PARITY_ERR |  in meson_uart_set_termios()
407 	uart_update_timeout(port, termios->c_cflag, baud);  in meson_uart_set_termios()
408 	spin_unlock_irqrestore(&port->lock, flags);  in meson_uart_set_termios()
416 	if (port->type != PORT_MESON)  in meson_uart_verify_port()
417 		ret = -EINVAL;  in meson_uart_verify_port()
418 	if (port->irq != ser->irq)  in meson_uart_verify_port()
419 		ret = -EINVAL;  in meson_uart_verify_port()
420 	if (ser->baud_base < 9600)  in meson_uart_verify_port()
421 		ret = -EINVAL;  in meson_uart_verify_port()
427 	devm_iounmap(port->dev, port->membase);  in meson_uart_release_port()
428 	port->membase = NULL;  in meson_uart_release_port()
429 	devm_release_mem_region(port->dev, port->mapbase, port->mapsize);  in meson_uart_release_port()
434 	if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,  in meson_uart_request_port()
435 				     dev_name(port->dev))) {  in meson_uart_request_port()
436 		dev_err(port->dev, "Memory region busy\n");  in meson_uart_request_port()
437 		return -EBUSY;  in meson_uart_request_port()
440 	port->membase = devm_ioremap(port->dev, port->mapbase,  in meson_uart_request_port()
441 					     port->mapsize);  in meson_uart_request_port()
442 	if (!port->membase)  in meson_uart_request_port()
443 		return -ENOMEM;  in meson_uart_request_port()
451 		port->type = PORT_MESON;  in meson_uart_config_port()
458  * Console polling routines for writing and reading from the uart while
467 	spin_lock_irqsave(&port->lock, flags);  in meson_uart_poll_get_char()
469 	if (readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY)  in meson_uart_poll_get_char()
472 		c = readl(port->membase + AML_UART_RFIFO);  in meson_uart_poll_get_char()
474 	spin_unlock_irqrestore(&port->lock, flags);  in meson_uart_poll_get_char()
485 	spin_lock_irqsave(&port->lock, flags);  in meson_uart_poll_put_char()
488 	ret = readl_poll_timeout_atomic(port->membase + AML_UART_STATUS, reg,  in meson_uart_poll_put_char()
492 	if (ret == -ETIMEDOUT) {  in meson_uart_poll_put_char()
493 		dev_err(port->dev, "Timeout waiting for UART TX EMPTY\n");  in meson_uart_poll_put_char()
498 	writel(c, port->membase + AML_UART_WFIFO);  in meson_uart_poll_put_char()
501 	ret = readl_poll_timeout_atomic(port->membase + AML_UART_STATUS, reg,  in meson_uart_poll_put_char()
505 	if (ret == -ETIMEDOUT)  in meson_uart_poll_put_char()
506 		dev_err(port->dev, "Timeout waiting for UART TX EMPTY\n");  in meson_uart_poll_put_char()
509 	spin_unlock_irqrestore(&port->lock, flags);  in meson_uart_poll_put_char()
540 	val = readl(port->membase + AML_UART_CONTROL);  in meson_uart_enable_tx_engine()
542 	writel(val, port->membase + AML_UART_CONTROL);  in meson_uart_enable_tx_engine()
547 	if (!port->membase)  in meson_console_putchar()
550 	while (readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)  in meson_console_putchar()
552 	writel(ch, port->membase + AML_UART_WFIFO);  in meson_console_putchar()
563 	if (port->sysrq) {  in meson_serial_port_write()
566 		locked = spin_trylock(&port->lock);  in meson_serial_port_write()
568 		spin_lock(&port->lock);  in meson_serial_port_write()
572 	val = readl(port->membase + AML_UART_CONTROL);  in meson_serial_port_write()
574 	writel(tmp, port->membase + AML_UART_CONTROL);  in meson_serial_port_write()
577 	writel(val, port->membase + AML_UART_CONTROL);  in meson_serial_port_write()
580 		spin_unlock(&port->lock);  in meson_serial_port_write()
589 	port = meson_ports[co->index];  in meson_serial_console_write()
604 	if (co->index < 0 || co->index >= AML_UART_PORT_NUM)  in meson_serial_console_setup()
605 		return -EINVAL;  in meson_serial_console_setup()
607 	port = meson_ports[co->index];  in meson_serial_console_setup()
608 	if (!port || !port->membase)  in meson_serial_console_setup()
609 		return -ENODEV;  in meson_serial_console_setup()
626 		.index		= -1,					\
637 	struct earlycon_device *dev = co->data;  in meson_serial_early_console_write()
639 	meson_serial_port_write(&dev->port, s, count);  in meson_serial_early_console_write()
645 	if (!device->port.membase)  in meson_serial_early_console_setup()
646 		return -ENODEV;  in meson_serial_early_console_setup()
648 	meson_uart_enable_tx_engine(&device->port);  in meson_serial_early_console_setup()
649 	device->con->write = meson_serial_early_console_write;  in meson_serial_early_console_setup()
653 OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
680 	clk_pclk = devm_clk_get_enabled(&pdev->dev, "pclk");  in meson_uart_probe_clocks()
684 	clk_xtal = devm_clk_get_enabled(&pdev->dev, "xtal");  in meson_uart_probe_clocks()
688 	clk_baud = devm_clk_get_enabled(&pdev->dev, "baud");  in meson_uart_probe_clocks()
692 	port->uartclk = clk_get_rate(clk_baud);  in meson_uart_probe_clocks()
699 	return (pd && pd->uart_driver) ?  in meson_uart_current()
700 		pd->uart_driver : &meson_uart_driver_ttyAML;  in meson_uart_current()
709 	u32 fifosize = 64; /* Default is 64, 128 for EE UART_0 */  in meson_uart_probe()  local
714 	if (pdev->dev.of_node)  in meson_uart_probe()
715 		pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");  in meson_uart_probe()
717 	if (pdev->id < 0) {  in meson_uart_probe()
722 				pdev->id = id;  in meson_uart_probe()
728 	if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM)  in meson_uart_probe()
729 		return -EINVAL;  in meson_uart_probe()
733 		return -ENODEV;  in meson_uart_probe()
739 	of_property_read_u32(pdev->dev.of_node, "fifo-size", &fifosize);  in meson_uart_probe()
740 	has_rtscts = of_property_read_bool(pdev->dev.of_node, "uart-has-rtscts");  in meson_uart_probe()
742 	if (meson_ports[pdev->id]) {  in meson_uart_probe()
743 		return dev_err_probe(&pdev->dev, -EBUSY,  in meson_uart_probe()
744 				     "port %d already allocated\n", pdev->id);  in meson_uart_probe()
747 	port = devm_kzalloc(&pdev->dev, sizeof(struct uart_port), GFP_KERNEL);  in meson_uart_probe()
749 		return -ENOMEM;  in meson_uart_probe()
755 	priv_data = device_get_match_data(&pdev->dev);  in meson_uart_probe()
759 	if (!uart_driver->state) {  in meson_uart_probe()
762 			return dev_err_probe(&pdev->dev, ret,  in meson_uart_probe()
763 					     "can't register uart driver\n");  in meson_uart_probe()
766 	port->iotype = UPIO_MEM;  in meson_uart_probe()
767 	port->mapbase = res_mem->start;  in meson_uart_probe()
768 	port->mapsize = resource_size(res_mem);  in meson_uart_probe()
769 	port->irq = irq;  in meson_uart_probe()
770 	port->flags = UPF_BOOT_AUTOCONF | UPF_LOW_LATENCY;  in meson_uart_probe()
772 		port->flags |= UPF_HARD_FLOW;  in meson_uart_probe()
773 	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MESON_CONSOLE);  in meson_uart_probe()
774 	port->dev = &pdev->dev;  in meson_uart_probe()
775 	port->line = pdev->id;  in meson_uart_probe()
776 	port->type = PORT_MESON;  in meson_uart_probe()
777 	port->x_char = 0;  in meson_uart_probe()
778 	port->ops = &meson_uart_ops;  in meson_uart_probe()
779 	port->fifosize = fifosize;  in meson_uart_probe()
780 	port->private_data = (void *)priv_data;  in meson_uart_probe()
782 	meson_ports[pdev->id] = port;  in meson_uart_probe()
793 		meson_ports[pdev->id] = NULL;  in meson_uart_probe()
804 	uart_driver = meson_uart_current(port->private_data);  in meson_uart_remove()
806 	meson_ports[pdev->id] = NULL;  in meson_uart_remove()
812 	/* No more available uart ports, unregister uart driver */  in meson_uart_remove()
833 	{ .compatible = "amlogic,meson6-uart" },
834 	{ .compatible = "amlogic,meson8-uart" },
835 	{ .compatible = "amlogic,meson8b-uart" },
836 	{ .compatible = "amlogic,meson-gx-uart" },
838 		.compatible = "amlogic,meson-g12a-uart",
842 		.compatible = "amlogic,meson-s4-uart",
846 		.compatible = "amlogic,meson-a1-uart",