1 #include <linux/device.h>
2 #include <linux/kernel.h>
3 #include <linux/module.h>
5 #include <linux/serial.h>
6 #include <linux/serial_core.h>
7 #include <linux/serial_8250.h>
8 #include <uapi/linux/serial_core.h>
10 struct serial_8250_men_mcb_data {
11 struct uart_8250_port uart;
16 * The Z125 16550-compatible UART has no fixed base clock assigned
17 * So, depending on the board we're on, we need to adjust the
18 * parameter in order to really set the correct baudrate, and
19 * do so if possible without user interaction
21 static u32 men_z125_lookup_uartclk(struct mcb_device *mdev)
23 /* use default value if board is not available below */
26 dev_info(&mdev->dev, "%s on board %s\n",
29 if (strncmp(mdev->bus->name, "F075", 4) == 0)
31 else if (strncmp(mdev->bus->name, "F216", 4) == 0)
33 else if (strncmp(mdev->bus->name, "G215", 4) == 0)
37 "board not detected, using default uartclk\n");
44 static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
45 const struct mcb_device_id *id)
47 struct serial_8250_men_mcb_data *data;
50 data = devm_kzalloc(&mdev->dev,
51 sizeof(struct serial_8250_men_mcb_data),
56 mcb_set_drvdata(mdev, data);
57 data->uart.port.dev = mdev->dma_dev;
58 spin_lock_init(&data->uart.port.lock);
60 data->uart.port.type = PORT_16550;
61 data->uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
62 data->uart.port.iotype = UPIO_MEM;
63 data->uart.port.uartclk = men_z125_lookup_uartclk(mdev);
64 data->uart.port.regshift = 0;
65 data->uart.port.fifosize = 60;
67 mem = mcb_get_resource(mdev, IORESOURCE_MEM);
71 data->uart.port.irq = mcb_get_irq(mdev);
73 data->uart.port.membase = devm_ioremap_resource(&mdev->dev, mem);
74 if (IS_ERR(data->uart.port.membase))
75 return PTR_ERR_OR_ZERO(data->uart.port.membase);
77 data->uart.port.mapbase = (unsigned long) mem->start;
78 data->uart.port.iobase = data->uart.port.mapbase;
80 /* ok, register the port */
81 data->line = serial8250_register_8250_port(&data->uart);
85 dev_info(&mdev->dev, "found 16Z125 UART: ttyS%d\n", data->line);
90 static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
92 struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
95 serial8250_unregister_port(data->line);
98 static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
102 MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
104 static struct mcb_driver mcb_driver = {
106 .name = "8250_men_mcb",
107 .owner = THIS_MODULE,
109 .probe = serial_8250_men_mcb_probe,
110 .remove = serial_8250_men_mcb_remove,
111 .id_table = serial_8250_men_mcb_ids,
113 module_mcb_driver(mcb_driver);
115 MODULE_LICENSE("GPL v2");
116 MODULE_DESCRIPTION("MEN 16z125 8250 UART driver");
117 MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
118 MODULE_ALIAS("mcb:16z125");