1 // SPDX-License-Identifier: GPL-2.0+
61  * to the host on the Host <-> BMC LPC bus. It could be different on a
67 	return readb(vuart->port->port.membase + reg);  in aspeed_vuart_readb()
72 	writeb(val, vuart->port->port.membase + reg);  in aspeed_vuart_writeb()
90 		return -EINVAL;  in aspeed_vuart_set_lpc_address()
134 		return -EINVAL;  in aspeed_vuart_set_sirq()
250 	struct aspeed_vuart *vuart = uart_8250_port->port.private_data;  in aspeed_vuart_startup()
265 	struct aspeed_vuart *vuart = uart_8250_port->port.private_data;  in aspeed_vuart_shutdown()
278 	lockdep_assert_held_once(&up->port.lock);  in __aspeed_vuart_set_throttle()
280 	up->ier &= ~irqs;  in __aspeed_vuart_set_throttle()
282 		up->ier |= irqs;  in __aspeed_vuart_set_throttle()
283 	serial_out(up, UART_IER, up->ier);  in __aspeed_vuart_set_throttle()
308 	struct uart_8250_port *up = vuart->port;  in aspeed_vuart_unthrottle_exp()
310 	if (!tty_buffer_space_avail(&up->port.state->port)) {  in aspeed_vuart_unthrottle_exp()
311 		mod_timer(&vuart->unthrottle_timer,  in aspeed_vuart_unthrottle_exp()
316 	aspeed_vuart_unthrottle(&up->port);  in aspeed_vuart_unthrottle_exp()
320  * Custom interrupt handler to manage finer-grained flow control. Although we
347 		space = tty_buffer_space_avail(&port->state->port);  in aspeed_vuart_handle_irq()
351 			struct aspeed_vuart *vuart = port->private_data;  in aspeed_vuart_handle_irq()
354 			if (!timer_pending(&vuart->unthrottle_timer))  in aspeed_vuart_handle_irq()
355 				mod_timer(&vuart->unthrottle_timer,  in aspeed_vuart_handle_irq()
364 				if (--count == 0)  in aspeed_vuart_handle_irq()
368 			tty_flip_buffer_push(&port->state->port);  in aspeed_vuart_handle_irq()
390 		dev_warn(vuart->dev,  in aspeed_vuart_auto_configure_sirq_polarity()
391 			 "could not get regmap for aspeed,sirq-polarity-sense\n");  in aspeed_vuart_auto_configure_sirq_polarity()
395 		dev_warn(vuart->dev, "could not read hw strap table\n");  in aspeed_vuart_auto_configure_sirq_polarity()
410 		return -EINVAL;  in aspeed_vuart_map_irq_polarity()
417 	struct device *dev = &pdev->dev;  in aspeed_vuart_probe()
426 	np = pdev->dev.of_node;  in aspeed_vuart_probe()
428 	vuart = devm_kzalloc(&pdev->dev, sizeof(*vuart), GFP_KERNEL);  in aspeed_vuart_probe()
430 		return -ENOMEM;  in aspeed_vuart_probe()
432 	vuart->dev = &pdev->dev;  in aspeed_vuart_probe()
433 	timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0);  in aspeed_vuart_probe()
437 		return -EINVAL;  in aspeed_vuart_probe()
441 	port.port.mapbase = res->start;  in aspeed_vuart_probe()
448 	port.port.dev = &pdev->dev;  in aspeed_vuart_probe()
454 	rc = sysfs_create_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);  in aspeed_vuart_probe()
466 			rc = dev_err_probe(dev, PTR_ERR(vclk), "clk or clock-frequency not defined\n");  in aspeed_vuart_probe()
473 	/* If current-speed was set, then try not to change it. */  in aspeed_vuart_probe()
474 	if (of_property_read_u32(np, "current-speed", &prop) == 0)  in aspeed_vuart_probe()
483 	if (of_property_read_bool(np, "auto-flow-control"))  in aspeed_vuart_probe()
490 	vuart->line = rc;  in aspeed_vuart_probe()
491 	vuart->port = serial8250_get_port(vuart->line);  in aspeed_vuart_probe()
494 		np, "aspeed,sirq-polarity-sense", 2, 0,  in aspeed_vuart_probe()
497 		dev_dbg(&pdev->dev,  in aspeed_vuart_probe()
498 			"aspeed,sirq-polarity-sense property not found\n");  in aspeed_vuart_probe()
507 	rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &prop);  in aspeed_vuart_probe()
513 		dev_err_probe(dev, rc, "invalid value in aspeed,lpc-io-reg property\n");  in aspeed_vuart_probe()
517 	rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2);  in aspeed_vuart_probe()
525 		dev_err_probe(dev, rc, "invalid sirq number in aspeed,lpc-interrupts property\n");  in aspeed_vuart_probe()
532 				   "invalid sirq polarity in aspeed,lpc-interrupts property\n");  in aspeed_vuart_probe()
545 	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);  in aspeed_vuart_probe()
553 	del_timer_sync(&vuart->unthrottle_timer);  in aspeed_vuart_remove()
555 	serial8250_unregister_port(vuart->line);  in aspeed_vuart_remove()
556 	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);  in aspeed_vuart_remove()
560 	{ .compatible = "aspeed,ast2400-vuart" },
561 	{ .compatible = "aspeed,ast2500-vuart" },
568 		.name = "aspeed-vuart",