1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2019-2020 Antmicro <www.antmicro.com>
24  * The definitions below are true for LiteX SoC configured for 8-bit CSR Bus,
25  * 32-bit aligned.
73 	struct uart_port *port = &uart->port;  in liteuart_timer()
74 	unsigned char __iomem *membase = port->membase;  in liteuart_timer()
81 		port->icount.rx++;  in liteuart_timer()
90 		tty_flip_buffer_push(&port->state->port);  in liteuart_timer()
93 	mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));  in liteuart_timer()
98 	while (litex_read8(port->membase + OFF_TXFULL))  in liteuart_putchar()
101 	litex_write8(port->membase + OFF_RXTX, ch);  in liteuart_putchar()
107 	if (!litex_read8(port->membase + OFF_TXFULL))  in liteuart_tx_empty()
129 	struct circ_buf *xmit = &port->state->xmit;  in liteuart_start_tx()
132 	if (unlikely(port->x_char)) {  in liteuart_start_tx()
133 		litex_write8(port->membase + OFF_RXTX, port->x_char);  in liteuart_start_tx()
134 		port->icount.tx++;  in liteuart_start_tx()
135 		port->x_char = 0;  in liteuart_start_tx()
137 		while (xmit->head != xmit->tail) {  in liteuart_start_tx()
138 			ch = xmit->buf[xmit->tail];  in liteuart_start_tx()
139 			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);  in liteuart_start_tx()
140 			port->icount.tx++;  in liteuart_start_tx()
154 	del_timer(&uart->timer);  in liteuart_stop_rx()
167 	litex_write8(port->membase + OFF_EV_ENABLE, 0);  in liteuart_startup()
170 	timer_setup(&uart->timer, liteuart_timer, 0);  in liteuart_startup()
171 	mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));  in liteuart_startup()
183 	unsigned int baud;  in liteuart_set_termios()  local
186 	spin_lock_irqsave(&port->lock, flags);  in liteuart_set_termios()
189 	baud = uart_get_baud_rate(port, new, old, 0, 460800);  in liteuart_set_termios()
190 	uart_update_timeout(port, new->c_cflag, baud);  in liteuart_set_termios()
192 	spin_unlock_irqrestore(&port->lock, flags);  in liteuart_set_termios()
212 	 * Driver core for serial ports forces a non-zero value for port type.  in liteuart_config_port()
216 	port->type = 1;  in liteuart_config_port()
222 	if (port->type != PORT_UNKNOWN && ser->type != 1)  in liteuart_verify_port()
223 		return -EINVAL;  in liteuart_verify_port()
253 	/* look for aliases; auto-enumerate for free index if not found */  in liteuart_probe()
254 	dev_id = of_alias_get_id(pdev->dev.of_node, "serial");  in liteuart_probe()
260 	uart = devm_kzalloc(&pdev->dev, sizeof(struct liteuart_port), GFP_KERNEL);  in liteuart_probe()
262 		return -ENOMEM;  in liteuart_probe()
268 	uart->id = dev_id;  in liteuart_probe()
269 	port = &uart->port;  in liteuart_probe()
272 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in liteuart_probe()
273 	if (IS_ERR(port->membase))  in liteuart_probe()
274 		return PTR_ERR(port->membase);  in liteuart_probe()
277 	port->dev = &pdev->dev;  in liteuart_probe()
278 	port->iotype = UPIO_MEM;  in liteuart_probe()
279 	port->flags = UPF_BOOT_AUTOCONF;  in liteuart_probe()
280 	port->ops = &liteuart_ops;  in liteuart_probe()
281 	port->regshift = 2;  in liteuart_probe()
282 	port->fifosize = 16;  in liteuart_probe()
283 	port->iobase = 1;  in liteuart_probe()
284 	port->type = PORT_UNKNOWN;  in liteuart_probe()
285 	port->line = dev_id;  in liteuart_probe()
286 	spin_lock_init(&port->lock);  in liteuart_probe()
288 	return uart_add_one_port(&liteuart_driver, &uart->port);  in liteuart_probe()
296 	xa_erase(&liteuart_array, uart->id);  in liteuart_remove()
325 	uart = (struct liteuart_port *)xa_load(&liteuart_array, co->index);  in liteuart_console_write()
326 	port = &uart->port;  in liteuart_console_write()
328 	spin_lock_irqsave(&port->lock, flags);  in liteuart_console_write()
330 	spin_unlock_irqrestore(&port->lock, flags);  in liteuart_console_write()
337 	int baud = 115200;  in liteuart_console_setup()  local
342 	uart = (struct liteuart_port *)xa_load(&liteuart_array, co->index);  in liteuart_console_setup()
344 		return -ENODEV;  in liteuart_console_setup()
346 	port = &uart->port;  in liteuart_console_setup()
347 	if (!port->membase)  in liteuart_console_setup()
348 		return -ENODEV;  in liteuart_console_setup()
351 		uart_parse_options(options, &baud, &parity, &bits, &flow);  in liteuart_console_setup()
353 	return uart_set_options(port, co, baud, parity, bits, flow);  in liteuart_console_setup()
362 	.index = -1,
377 	struct earlycon_device *device = console->data;  in early_liteuart_write()
378 	struct uart_port *port = &device->port;  in early_liteuart_write()
386 	if (!device->port.membase)  in early_liteuart_setup()
387 		return -ENODEV;  in early_liteuart_setup()
389 	device->con->write = early_liteuart_write;  in early_liteuart_setup()