1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2019-2020 Antmicro <www.antmicro.com>
25  * The definitions below are true for LiteX SoC configured for 8-bit CSR Bus,
26  * 32-bit aligned.
76 		uart->irq_reg |= mask;  in liteuart_update_irq_reg()
78 		uart->irq_reg &= ~mask;  in liteuart_update_irq_reg()
80 	if (port->irq)  in liteuart_update_irq_reg()
81 		litex_write8(port->membase + OFF_EV_ENABLE, uart->irq_reg);  in liteuart_update_irq_reg()
99 	del_timer(&uart->timer);  in liteuart_stop_rx()
104 	unsigned char __iomem *membase = port->membase;  in liteuart_rx_chars()
109 		port->icount.rx++;  in liteuart_rx_chars()
119 	tty_flip_buffer_push(&port->state->port);  in liteuart_rx_chars()
127 		!litex_read8(port->membase + OFF_TXFULL),  in liteuart_tx_chars()
128 		litex_write8(port->membase + OFF_RXTX, ch));  in liteuart_tx_chars()
134 	struct uart_port *port = &uart->port;  in liteuart_interrupt()
143 	isr = litex_read8(port->membase + OFF_EV_PENDING) & uart->irq_reg;  in liteuart_interrupt()
156 	struct uart_port *port = &uart->port;  in liteuart_timer()
159 	mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));  in liteuart_timer()
165 	if (!litex_read8(port->membase + OFF_TXFULL))  in liteuart_tx_empty()
187 	if (port->irq) {  in liteuart_startup()
188 		ret = request_irq(port->irq, liteuart_interrupt, 0,  in liteuart_startup()
191 			dev_warn(port->dev,  in liteuart_startup()
193 				port->line, port->irq);  in liteuart_startup()
194 			port->irq = 0;  in liteuart_startup()
203 	if (!port->irq) {  in liteuart_startup()
204 		timer_setup(&uart->timer, liteuart_timer, 0);  in liteuart_startup()
205 		mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));  in liteuart_startup()
220 	if (port->irq)  in liteuart_shutdown()
221 		free_irq(port->irq, port);  in liteuart_shutdown()
223 		del_timer_sync(&uart->timer);  in liteuart_shutdown()
229 	unsigned int baud;  in liteuart_set_termios()  local
235 	baud = uart_get_baud_rate(port, new, old, 0, 460800);  in liteuart_set_termios()
236 	uart_update_timeout(port, new->c_cflag, baud);  in liteuart_set_termios()
249 	 * Driver core for serial ports forces a non-zero value for port type.  in liteuart_config_port()
253 	port->type = 1;  in liteuart_config_port()
259 	if (port->type != PORT_UNKNOWN && ser->type != 1)  in liteuart_verify_port()
260 		return -EINVAL;  in liteuart_verify_port()
287 	uart = devm_kzalloc(&pdev->dev, sizeof(struct liteuart_port), GFP_KERNEL);  in liteuart_probe()
289 		return -ENOMEM;  in liteuart_probe()
291 	port = &uart->port;  in liteuart_probe()
294 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in liteuart_probe()
295 	if (IS_ERR(port->membase))  in liteuart_probe()
296 		return PTR_ERR(port->membase);  in liteuart_probe()
299 	if (ret < 0 && ret != -ENXIO)  in liteuart_probe()
302 		port->irq = ret;  in liteuart_probe()
304 	/* look for aliases; auto-enumerate for free index if not found */  in liteuart_probe()
305 	dev_id = of_alias_get_id(pdev->dev.of_node, "serial");  in liteuart_probe()
316 	port->dev = &pdev->dev;  in liteuart_probe()
317 	port->iotype = UPIO_MEM;  in liteuart_probe()
318 	port->flags = UPF_BOOT_AUTOCONF;  in liteuart_probe()
319 	port->ops = &liteuart_ops;  in liteuart_probe()
320 	port->fifosize = 16;  in liteuart_probe()
321 	port->type = PORT_UNKNOWN;  in liteuart_probe()
322 	port->line = dev_id;  in liteuart_probe()
323 	spin_lock_init(&port->lock);  in liteuart_probe()
327 	ret = uart_add_one_port(&liteuart_driver, &uart->port);  in liteuart_probe()
342 	unsigned int line = port->line;  in liteuart_remove()
367 	while (litex_read8(port->membase + OFF_TXFULL))  in liteuart_putchar()
370 	litex_write8(port->membase + OFF_RXTX, ch);  in liteuart_putchar()
380 	uart = (struct liteuart_port *)xa_load(&liteuart_array, co->index);  in liteuart_console_write()
381 	port = &uart->port;  in liteuart_console_write()
392 	int baud = 115200;  in liteuart_console_setup()  local
397 	uart = (struct liteuart_port *)xa_load(&liteuart_array, co->index);  in liteuart_console_setup()
399 		return -ENODEV;  in liteuart_console_setup()
401 	port = &uart->port;  in liteuart_console_setup()
402 	if (!port->membase)  in liteuart_console_setup()
403 		return -ENODEV;  in liteuart_console_setup()
406 		uart_parse_options(options, &baud, &parity, &bits, &flow);  in liteuart_console_setup()
408 	return uart_set_options(port, co, baud, parity, bits, flow);  in liteuart_console_setup()
417 	.index = -1,
432 	struct earlycon_device *device = console->data;  in early_liteuart_write()
433 	struct uart_port *port = &device->port;  in early_liteuart_write()
441 	if (!device->port.membase)  in early_liteuart_setup()
442 		return -ENODEV;  in early_liteuart_setup()
444 	device->con->write = early_liteuart_write;  in early_liteuart_setup()