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Commit 562e6ef8 authored by Michael Moese's avatar Michael Moese Committed by Greg Kroah-Hartman
Browse files

Introduce 8250_men_mcb 



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: default avatarMichael Moese <michael.moese@men.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2ce80087

drivers/tty/serial/8250/8250_men_mcb.c

0 → 100644
+118 −0
Original line number Diff line number Diff line 
#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");

drivers/tty/serial/8250/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -155,6 +155,17 @@ config SERIAL_8250_CS 


	  If unsure, say N.



config SERIAL_8250_MEN_MCB

	tristate "MEN Z125 UART device support"

	depends on MCB && SERIAL_8250

	help

	  This enables support for FPGA based UARTs found on many MEN

	  boards. This driver enables support for the Z125 UARTs.



	  To compile this driver as a module, chose M here: the

	  module will be called 8250_men_mcb.





config SERIAL_8250_NR_UARTS

	int "Maximum number of 8250/16550 serial ports"

	depends on SERIAL_8250

drivers/tty/serial/8250/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o 
obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554)	+= 8250_exar_st16c554.o

obj-$(CONFIG_SERIAL_8250_HUB6)		+= 8250_hub6.o

obj-$(CONFIG_SERIAL_8250_FSL)		+= 8250_fsl.o

obj-$(CONFIG_SERIAL_8250_MEN_MCB)	+= 8250_men_mcb.o

obj-$(CONFIG_SERIAL_8250_DW)		+= 8250_dw.o

obj-$(CONFIG_SERIAL_8250_EM)		+= 8250_em.o

obj-$(CONFIG_SERIAL_8250_OMAP)		+= 8250_omap.o