aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/8250/8250_men_mcb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty/serial/8250/8250_men_mcb.c')
-rw-r--r--drivers/tty/serial/8250/8250_men_mcb.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_men_mcb.c b/drivers/tty/serial/8250/8250_men_mcb.c
new file mode 100644
index 000000000000..308977807994
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_men_mcb.c
@@ -0,0 +1,118 @@
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mcb.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <uapi/linux/serial_core.h>
+
+struct serial_8250_men_mcb_data {
+ struct uart_8250_port uart;
+ int line;
+};
+
+/*
+ * The Z125 16550-compatible UART has no fixed base clock assigned
+ * So, depending on the board we're on, we need to adjust the
+ * parameter in order to really set the correct baudrate, and
+ * do so if possible without user interaction
+ */
+static u32 men_z125_lookup_uartclk(struct mcb_device *mdev)
+{
+ /* use default value if board is not available below */
+ u32 clkval = 1041666;
+
+ dev_info(&mdev->dev, "%s on board %s\n",
+ dev_name(&mdev->dev),
+ mdev->bus->name);
+ if (strncmp(mdev->bus->name, "F075", 4) == 0)
+ clkval = 1041666;
+ else if (strncmp(mdev->bus->name, "F216", 4) == 0)
+ clkval = 1843200;
+ else if (strncmp(mdev->bus->name, "G215", 4) == 0)
+ clkval = 1843200;
+ else
+ dev_info(&mdev->dev,
+ "board not detected, using default uartclk\n");
+
+ clkval = clkval << 4;
+
+ return clkval;
+}
+
+static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
+ const struct mcb_device_id *id)
+{
+ struct serial_8250_men_mcb_data *data;
+ struct resource *mem;
+
+ data = devm_kzalloc(&mdev->dev,
+ sizeof(struct serial_8250_men_mcb_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ mcb_set_drvdata(mdev, data);
+ data->uart.port.dev = mdev->dma_dev;
+ spin_lock_init(&data->uart.port.lock);
+
+ data->uart.port.type = PORT_16550;
+ data->uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
+ data->uart.port.iotype = UPIO_MEM;
+ data->uart.port.uartclk = men_z125_lookup_uartclk(mdev);
+ data->uart.port.regshift = 0;
+ data->uart.port.fifosize = 60;
+
+ mem = mcb_get_resource(mdev, IORESOURCE_MEM);
+ if (mem == NULL)
+ return -ENXIO;
+
+ data->uart.port.irq = mcb_get_irq(mdev);
+
+ data->uart.port.membase = devm_ioremap_resource(&mdev->dev, mem);
+ if (IS_ERR(data->uart.port.membase))
+ return PTR_ERR_OR_ZERO(data->uart.port.membase);
+
+ data->uart.port.mapbase = (unsigned long) mem->start;
+ data->uart.port.iobase = data->uart.port.mapbase;
+
+ /* ok, register the port */
+ data->line = serial8250_register_8250_port(&data->uart);
+ if (data->line < 0)
+ return data->line;
+
+ dev_info(&mdev->dev, "found 16Z125 UART: ttyS%d\n", data->line);
+
+ return 0;
+}
+
+static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
+{
+ struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
+
+ if (data)
+ serial8250_unregister_port(data->line);
+}
+
+static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
+ { .device = 0x7d },
+ { }
+};
+MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
+
+static struct mcb_driver mcb_driver = {
+ .driver = {
+ .name = "8250_men_mcb",
+ .owner = THIS_MODULE,
+ },
+ .probe = serial_8250_men_mcb_probe,
+ .remove = serial_8250_men_mcb_remove,
+ .id_table = serial_8250_men_mcb_ids,
+};
+module_mcb_driver(mcb_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MEN 16z125 8250 UART driver");
+MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
+MODULE_ALIAS("mcb:16z125");