1 // SPDX-License-Identifier: GPL-2.0+
30 		status = p->serial_in(p, UART_LSR);  in tegra_uart_handle_break()
32 			status = p->serial_in(p, UART_RX);  in tegra_uart_handle_break()
35 		if (--tmout == 0)  in tegra_uart_handle_break()
44 	struct tegra_uart *uart;  in tegra_uart_probe()  local
49 	uart = devm_kzalloc(&pdev->dev, sizeof(*uart), GFP_KERNEL);  in tegra_uart_probe()
50 	if (!uart)  in tegra_uart_probe()
51 		return -ENOMEM;  in tegra_uart_probe()
56 	spin_lock_init(&port->lock);  in tegra_uart_probe()
58 	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |  in tegra_uart_probe()
60 	port->iotype = UPIO_MEM32;  in tegra_uart_probe()
61 	port->regshift = 2;  in tegra_uart_probe()
62 	port->type = PORT_TEGRA;  in tegra_uart_probe()
63 	port->irqflags |= IRQF_SHARED;  in tegra_uart_probe()
64 	port->dev = &pdev->dev;  in tegra_uart_probe()
65 	port->handle_break = tegra_uart_handle_break;  in tegra_uart_probe()
67 	ret = of_alias_get_id(pdev->dev.of_node, "serial");  in tegra_uart_probe()
69 		port->line = ret;  in tegra_uart_probe()
75 	port->irq = ret;  in tegra_uart_probe()
79 		return -ENODEV;  in tegra_uart_probe()
81 	port->membase = devm_ioremap(&pdev->dev, res->start,  in tegra_uart_probe()
83 	if (!port->membase)  in tegra_uart_probe()
84 		return -ENOMEM;  in tegra_uart_probe()
86 	port->mapbase = res->start;  in tegra_uart_probe()
87 	port->mapsize = resource_size(res);  in tegra_uart_probe()
89 	uart->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);  in tegra_uart_probe()
90 	if (IS_ERR(uart->rst))  in tegra_uart_probe()
91 		return PTR_ERR(uart->rst);  in tegra_uart_probe()
93 	if (device_property_read_u32(&pdev->dev, "clock-frequency",  in tegra_uart_probe()
94 				     &port->uartclk)) {  in tegra_uart_probe()
95 		uart->clk = devm_clk_get(&pdev->dev, NULL);  in tegra_uart_probe()
96 		if (IS_ERR(uart->clk)) {  in tegra_uart_probe()
97 			dev_err(&pdev->dev, "failed to get clock!\n");  in tegra_uart_probe()
98 			return -ENODEV;  in tegra_uart_probe()
101 		ret = clk_prepare_enable(uart->clk);  in tegra_uart_probe()
105 		port->uartclk = clk_get_rate(uart->clk);  in tegra_uart_probe()
108 	ret = reset_control_deassert(uart->rst);  in tegra_uart_probe()
116 	platform_set_drvdata(pdev, uart);  in tegra_uart_probe()
117 	uart->line = ret;  in tegra_uart_probe()
122 	clk_disable_unprepare(uart->clk);  in tegra_uart_probe()
129 	struct tegra_uart *uart = platform_get_drvdata(pdev);  in tegra_uart_remove()  local
131 	serial8250_unregister_port(uart->line);  in tegra_uart_remove()
132 	reset_control_assert(uart->rst);  in tegra_uart_remove()
133 	clk_disable_unprepare(uart->clk);  in tegra_uart_remove()
141 	struct tegra_uart *uart = dev_get_drvdata(dev);  in tegra_uart_suspend()  local
142 	struct uart_8250_port *port8250 = serial8250_get_port(uart->line);  in tegra_uart_suspend()
143 	struct uart_port *port = &port8250->port;  in tegra_uart_suspend()
145 	serial8250_suspend_port(uart->line);  in tegra_uart_suspend()
148 		clk_disable_unprepare(uart->clk);  in tegra_uart_suspend()
155 	struct tegra_uart *uart = dev_get_drvdata(dev);  in tegra_uart_resume()  local
156 	struct uart_8250_port *port8250 = serial8250_get_port(uart->line);  in tegra_uart_resume()
157 	struct uart_port *port = &port8250->port;  in tegra_uart_resume()
160 		clk_prepare_enable(uart->clk);  in tegra_uart_resume()
162 	serial8250_resume_port(uart->line);  in tegra_uart_resume()
172 	{ .compatible = "nvidia,tegra20-uart", },
185 		.name = "tegra-uart",