Exemplo n.º 1
0
static int aspeed_vuart_remove(struct platform_device *pdev)
{
	struct aspeed_vuart *vuart = platform_get_drvdata(pdev);

	aspeed_vuart_set_enabled(vuart, false);
	serial8250_unregister_port(vuart->line);
	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
	clk_disable_unprepare(vuart->clk);

	return 0;
}
Exemplo n.º 2
0
static int aspeed_vuart_probe(struct platform_device *pdev)
{
	struct uart_8250_port port;
	struct aspeed_vuart *vuart;
	struct device_node *np;
	struct resource *res;
	u32 clk, prop;
	int rc;

	np = pdev->dev.of_node;

	vuart = devm_kzalloc(&pdev->dev, sizeof(*vuart), GFP_KERNEL);
	if (!vuart)
		return -ENOMEM;

	vuart->dev = &pdev->dev;
	timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	vuart->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(vuart->regs))
		return PTR_ERR(vuart->regs);

	memset(&port, 0, sizeof(port));
	port.port.private_data = vuart;
	port.port.membase = vuart->regs;
	port.port.mapbase = res->start;
	port.port.mapsize = resource_size(res);
	port.port.startup = aspeed_vuart_startup;
	port.port.shutdown = aspeed_vuart_shutdown;
	port.port.throttle = aspeed_vuart_throttle;
	port.port.unthrottle = aspeed_vuart_unthrottle;
	port.port.status = UPSTAT_SYNC_FIFO;
	port.port.dev = &pdev->dev;

	rc = sysfs_create_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
	if (rc < 0)
		return rc;

	if (of_property_read_u32(np, "clock-frequency", &clk)) {
		vuart->clk = devm_clk_get(&pdev->dev, NULL);
		if (IS_ERR(vuart->clk)) {
			dev_warn(&pdev->dev,
				"clk or clock-frequency not defined\n");
			rc = PTR_ERR(vuart->clk);
			goto err_sysfs_remove;
		}

		rc = clk_prepare_enable(vuart->clk);
		if (rc < 0)
			goto err_sysfs_remove;

		clk = clk_get_rate(vuart->clk);
	}

	/* If current-speed was set, then try not to change it. */
	if (of_property_read_u32(np, "current-speed", &prop) == 0)
		port.port.custom_divisor = clk / (16 * prop);

	/* Check for shifted address mapping */
	if (of_property_read_u32(np, "reg-offset", &prop) == 0)
		port.port.mapbase += prop;

	/* Check for registers offset within the devices address range */
	if (of_property_read_u32(np, "reg-shift", &prop) == 0)
		port.port.regshift = prop;

	/* Check for fifo size */
	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
		port.port.fifosize = prop;

	/* Check for a fixed line number */
	rc = of_alias_get_id(np, "serial");
	if (rc >= 0)
		port.port.line = rc;

	port.port.irq = irq_of_parse_and_map(np, 0);
	port.port.irqflags = IRQF_SHARED;
	port.port.handle_irq = aspeed_vuart_handle_irq;
	port.port.iotype = UPIO_MEM;
	port.port.type = PORT_16550A;
	port.port.uartclk = clk;
	port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF
		| UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST;

	if (of_property_read_bool(np, "no-loopback-test"))
		port.port.flags |= UPF_SKIP_TEST;

	if (port.port.fifosize)
		port.capabilities = UART_CAP_FIFO;

	if (of_property_read_bool(np, "auto-flow-control"))
		port.capabilities |= UART_CAP_AFE;

	rc = serial8250_register_8250_port(&port);
	if (rc < 0)
		goto err_clk_disable;

	vuart->line = rc;

	aspeed_vuart_set_enabled(vuart, true);
	aspeed_vuart_set_host_tx_discard(vuart, true);
	platform_set_drvdata(pdev, vuart);

	return 0;

err_clk_disable:
	clk_disable_unprepare(vuart->clk);
	irq_dispose_mapping(port.port.irq);
err_sysfs_remove:
	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
	return rc;
}