1 // SPDX-License-Identifier: GPL-2.0
10  *  Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com>
71 	unsigned int max_chars = port->fifosize;  in apbuart_rx_chars()
76 	while (UART_RX_DATA(status) && (max_chars--)) {  in apbuart_rx_chars()
81 		port->icount.rx++;  in apbuart_rx_chars()
89 				port->icount.brk++;  in apbuart_rx_chars()
93 				port->icount.parity++;  in apbuart_rx_chars()
95 				port->icount.frame++;  in apbuart_rx_chars()
98 				port->icount.overrun++;  in apbuart_rx_chars()
100 			rsr &= port->read_status_mask;  in apbuart_rx_chars()
118 	tty_flip_buffer_push(&port->state->port);  in apbuart_rx_chars()
125 	uart_port_tx_limited(port, ch, port->fifosize,  in apbuart_tx_chars()
136 	spin_lock(&port->lock);  in apbuart_int()
144 	spin_unlock(&port->lock);  in apbuart_int()
177 	retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port);  in apbuart_startup()
201 	free_irq(port->irq, port);  in apbuart_shutdown()
212 	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);  in apbuart_set_termios()
214 		panic("invalid baudrate %i\n", port->uartclk / 16);  in apbuart_set_termios()
216 	/* uart_get_divisor calc a *16 uart freq, apbuart is *8 */  in apbuart_set_termios()
221 	if (termios->c_cflag & PARENB) {  in apbuart_set_termios()
223 		if ((termios->c_cflag & PARODD))  in apbuart_set_termios()
228 	if (termios->c_cflag & CRTSCTS)  in apbuart_set_termios()
231 	spin_lock_irqsave(&port->lock, flags);  in apbuart_set_termios()
233 	/* Update the per-port timeout. */  in apbuart_set_termios()
234 	uart_update_timeout(port, termios->c_cflag, baud);  in apbuart_set_termios()
236 	port->read_status_mask = UART_STATUS_OE;  in apbuart_set_termios()
237 	if (termios->c_iflag & INPCK)  in apbuart_set_termios()
238 		port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE;  in apbuart_set_termios()
241 	port->ignore_status_mask = 0;  in apbuart_set_termios()
242 	if (termios->c_iflag & IGNPAR)  in apbuart_set_termios()
243 		port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE;  in apbuart_set_termios()
246 	if ((termios->c_cflag & CREAD) == 0)  in apbuart_set_termios()
247 		port->ignore_status_mask |= UART_DUMMY_RSR_RX;  in apbuart_set_termios()
250 	quot -= 1;  in apbuart_set_termios()
254 	spin_unlock_irqrestore(&port->lock, flags);  in apbuart_set_termios()
259 	return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL;  in apbuart_type()
264 	release_mem_region(port->mapbase, 0x100);  in apbuart_release_port()
269 	return request_mem_region(port->mapbase, 0x100, "grlib-apbuart")  in apbuart_request_port()
270 	    != NULL ? 0 : -EBUSY;  in apbuart_request_port()
278 		port->type = PORT_APBUART;  in apbuart_config_port()
288 	if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART)  in apbuart_verify_port()
289 		ret = -EINVAL;  in apbuart_verify_port()
290 	if (ser->irq < 0 || ser->irq >= NR_IRQS)  in apbuart_verify_port()
291 		ret = -EINVAL;  in apbuart_verify_port()
292 	if (ser->baud_base < 9600)  in apbuart_verify_port()
293 		ret = -EINVAL;  in apbuart_verify_port()
322 	int fifosize;  in apbuart_scan_fifo_size()  local
348 	fifosize = 1;  in apbuart_scan_fifo_size()
358 	while (((status >> 20) & 0x3F) == fifosize) {  in apbuart_scan_fifo_size()
359 		fifosize++;  in apbuart_scan_fifo_size()
364 	fifosize--;  in apbuart_scan_fifo_size()
369 	if (fifosize == 0)  in apbuart_scan_fifo_size()
370 		fifosize = 1;  in apbuart_scan_fifo_size()
372 	return fifosize;  in apbuart_scan_fifo_size()
379 	for (i = 0; i < port->fifosize; i++)  in apbuart_flush_fifo()
402 	struct uart_port *port = &grlib_apbuart_ports[co->index];  in apbuart_console_write()
441 		*baud = port->uartclk / (16 * (quot + 1));  in apbuart_console_get_options()
453 	pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n",  in apbuart_console_setup()
454 		 co, co->index, options);  in apbuart_console_setup()
457 	 * Check whether an invalid uart number has been specified, and  in apbuart_console_setup()
461 	if (co->index >= grlib_apbuart_port_nr)  in apbuart_console_setup()
462 		co->index = 0;  in apbuart_console_setup()
464 	port = &grlib_apbuart_ports[co->index];  in apbuart_console_setup()
466 	spin_lock_init(&port->lock);  in apbuart_console_setup()
484 	.index = -1,
494 		return -ENODEV;  in apbuart_console_init()
527 		if (op->dev.of_node == grlib_apbuart_nodes[i])  in apbuart_probe()
532 	port->dev = &op->dev;  in apbuart_probe()
533 	port->irq = op->archdata.irqs[0];  in apbuart_probe()
539 	printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n",  in apbuart_probe()
540 	       (unsigned long long) port->mapbase, port->irq);  in apbuart_probe()
558 		.name = "grlib-apbuart",
580 		/* Frequency of APB Bus is frequency of UART */  in grlib_apbuart_configure()
588 		addr = regs->phys_addr;  in grlib_apbuart_configure()
592 		port->mapbase = addr;  in grlib_apbuart_configure()
593 		port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map));  in grlib_apbuart_configure()
594 		port->irq = 0;  in grlib_apbuart_configure()
595 		port->iotype = UPIO_MEM;  in grlib_apbuart_configure()
596 		port->ops = &grlib_apbuart_ops;  in grlib_apbuart_configure()
597 		port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE);  in grlib_apbuart_configure()
598 		port->flags = UPF_BOOT_AUTOCONF;  in grlib_apbuart_configure()
599 		port->line = line;  in grlib_apbuart_configure()
600 		port->uartclk = *freq_hz;  in grlib_apbuart_configure()
601 		port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line);  in grlib_apbuart_configure()
610 	return line ? 0 : -ENODEV;  in grlib_apbuart_configure()