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562e6ef81f
This patch introduces the 8250_men_mcb driver for the MEN 16Z125 IP-Core. This is a 16550-type UART with a 60 byte FIFO. Due to strange old hardware, every board using this IP core requires different values for uartclk. A reasonable default is included in addition to the support of three boards. Additional values for other boards will be added later. This v2 has some whitespace fixes, I screwed this up yesterday. Signed-off-by: Michael Moese <michael.moese@men.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mcb.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/serial_8250.h>
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#include <uapi/linux/serial_core.h>
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struct serial_8250_men_mcb_data {
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struct uart_8250_port uart;
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int line;
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};
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/*
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* The Z125 16550-compatible UART has no fixed base clock assigned
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* So, depending on the board we're on, we need to adjust the
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* parameter in order to really set the correct baudrate, and
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* do so if possible without user interaction
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*/
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static u32 men_z125_lookup_uartclk(struct mcb_device *mdev)
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{
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/* use default value if board is not available below */
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u32 clkval = 1041666;
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dev_info(&mdev->dev, "%s on board %s\n",
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dev_name(&mdev->dev),
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mdev->bus->name);
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if (strncmp(mdev->bus->name, "F075", 4) == 0)
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clkval = 1041666;
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else if (strncmp(mdev->bus->name, "F216", 4) == 0)
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clkval = 1843200;
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else if (strncmp(mdev->bus->name, "G215", 4) == 0)
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clkval = 1843200;
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else
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dev_info(&mdev->dev,
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"board not detected, using default uartclk\n");
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clkval = clkval << 4;
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return clkval;
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}
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static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
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const struct mcb_device_id *id)
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{
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struct serial_8250_men_mcb_data *data;
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struct resource *mem;
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data = devm_kzalloc(&mdev->dev,
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sizeof(struct serial_8250_men_mcb_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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mcb_set_drvdata(mdev, data);
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data->uart.port.dev = mdev->dma_dev;
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spin_lock_init(&data->uart.port.lock);
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data->uart.port.type = PORT_16550;
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data->uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
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data->uart.port.iotype = UPIO_MEM;
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data->uart.port.uartclk = men_z125_lookup_uartclk(mdev);
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data->uart.port.regshift = 0;
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data->uart.port.fifosize = 60;
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mem = mcb_get_resource(mdev, IORESOURCE_MEM);
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if (mem == NULL)
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return -ENXIO;
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data->uart.port.irq = mcb_get_irq(mdev);
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data->uart.port.membase = devm_ioremap_resource(&mdev->dev, mem);
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if (IS_ERR(data->uart.port.membase))
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return PTR_ERR_OR_ZERO(data->uart.port.membase);
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data->uart.port.mapbase = (unsigned long) mem->start;
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data->uart.port.iobase = data->uart.port.mapbase;
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/* ok, register the port */
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data->line = serial8250_register_8250_port(&data->uart);
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if (data->line < 0)
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return data->line;
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dev_info(&mdev->dev, "found 16Z125 UART: ttyS%d\n", data->line);
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return 0;
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}
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static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
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{
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struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
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if (data)
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serial8250_unregister_port(data->line);
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}
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static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
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{ .device = 0x7d },
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{ }
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};
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MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
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static struct mcb_driver mcb_driver = {
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.driver = {
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.name = "8250_men_mcb",
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.owner = THIS_MODULE,
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},
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.probe = serial_8250_men_mcb_probe,
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.remove = serial_8250_men_mcb_remove,
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.id_table = serial_8250_men_mcb_ids,
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};
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module_mcb_driver(mcb_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MEN 16z125 8250 UART driver");
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MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
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MODULE_ALIAS("mcb:16z125");
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