1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for FPGA UART
45 		return -EINVAL;  in dfh_get_u64_param_val()
52 static int dfl_uart_get_params(struct dfl_device *dfl_dev, struct uart_8250_port *uart)  in dfl_uart_get_params()  argument
54 	struct device *dev = &dfl_dev->dev;  in dfl_uart_get_params()
63 	uart->port.uartclk = clk_freq;  in dfl_uart_get_params()
71 		uart->port.type = PORT_ALTR_16550_F32;  in dfl_uart_get_params()
75 		uart->port.type = PORT_ALTR_16550_F64;  in dfl_uart_get_params()
79 		uart->port.type = PORT_ALTR_16550_F128;  in dfl_uart_get_params()
83 		return dev_err_probe(dev, -EINVAL, "unsupported FIFO_LEN %llu\n", fifo_len);  in dfl_uart_get_params()
90 	uart->port.regshift = FIELD_GET(DFHv1_PARAM_REG_LAYOUT_SHIFT, reg_layout);  in dfl_uart_get_params()
94 		uart->port.iotype = UPIO_MEM32;  in dfl_uart_get_params()
98 		uart->port.iotype = UPIO_MEM16;  in dfl_uart_get_params()
102 		return dev_err_probe(dev, -EINVAL, "unsupported reg-width %u\n", reg_width);  in dfl_uart_get_params()
111 	struct device *dev = &dfl_dev->dev;  in dfl_uart_probe()
112 	struct uart_8250_port uart = { };  in dfl_uart_probe()  local
116 	uart.port.flags = UPF_IOREMAP;  in dfl_uart_probe()
117 	uart.port.mapbase = dfl_dev->mmio_res.start;  in dfl_uart_probe()
118 	uart.port.mapsize = resource_size(&dfl_dev->mmio_res);  in dfl_uart_probe()
120 	ret = dfl_uart_get_params(dfl_dev, &uart);  in dfl_uart_probe()
122 		return dev_err_probe(dev, ret, "failed uart feature walk\n");  in dfl_uart_probe()
124 	if (dfl_dev->num_irqs == 1)  in dfl_uart_probe()
125 		uart.port.irq = dfl_dev->irqs[0];  in dfl_uart_probe()
129 		return -ENOMEM;  in dfl_uart_probe()
131 	dfluart->line = serial8250_register_8250_port(&uart);  in dfl_uart_probe()
132 	if (dfluart->line < 0)  in dfl_uart_probe()
133 		return dev_err_probe(dev, dfluart->line, "unable to register 8250 port.\n");  in dfl_uart_probe()
142 	struct dfl_uart *dfluart = dev_get_drvdata(&dfl_dev->dev);  in dfl_uart_remove()
144 	serial8250_unregister_port(dfluart->line);  in dfl_uart_remove()
157 		.name = "dfl-uart",
165 MODULE_DESCRIPTION("DFL Intel UART driver");