[RFC] powerpc: experimental of serial port driver

[Arnd Bergmann]

This can be used for serial ports that are connected to an
OF platform bus. This is independent of whether they also
get detected as legacy_serial devices during early boot,
because the serial core makes sure it handles multiple
registrations fine.

It should be generic enough to work for more than just
8250 style devices, but those are the only ones I tested
so far.

Signed-off-by: Arnd Bergmann <arnd.bergmann at de.ibm.com>

Index: linux-2.6/drivers/serial/Makefile
===================================================================
--- linux-2.6.orig/drivers/serial/Makefile
+++ linux-2.6/drivers/serial/Makefile
@@ -56,3 +56,4 @@ obj-$(CONFIG_SERIAL_SGI_IOC4) += ioc4_se
 obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o
 obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o
 obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
+obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
Index: linux-2.6/drivers/serial/of_serial.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/serial/of_serial.c
@@ -0,0 +1,141 @@
+/*
+ *  Serial Port driver for Open Firmware platform devices
+ *
+ *    Copyright (C) 2006 Arnd Bergmann <arnd at arndb.de>, IBM Corp.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+
+#include <asm/of_platform.h>
+#include <asm/prom.h>
+
+/*
+ * Fill a struct uart_port for a given device node
+ */
+static int __devinit of_platform_serial_setup(struct of_device *ofdev,
+					int type, struct uart_port *port)
+{
+	struct resource resource;
+	struct device_node *np = ofdev->node;
+	const unsigned int *clk, *spd;
+	int ret;
+
+	memset(port, 0, sizeof *port);
+	spd = get_property(np, "current-speed", NULL);
+	clk = get_property(np, "clock-frequency", NULL);
+	if (!clk) {
+		dev_warn(&ofdev->dev, "no clock-frequency property set\n");
+		return -ENODEV;
+	}
+
+	ret = of_address_to_resource(np, 0, &resource);
+	if (ret) {
+		dev_warn(&ofdev->dev, "invalid address\n");
+		return ret;
+	}
+
+	spin_lock_init(&port->lock);
+	port->mapbase = resource.start;
+	port->irq = irq_of_parse_and_map(np, 0);
+	port->iotype = UPIO_MEM;
+	port->type = type;
+	port->uartclk = *clk;
+	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+	port->dev = &ofdev->dev;
+/*	if (spd) // FIXME: how to set?
+		port->speed = spd;
+*/
+	return 0;
+}
+
+/*
+ * Try to register a serial port
+ */
+static int __devinit of_platform_serial_probe(struct of_device *ofdev,
+						const struct of_device_id *id)
+{
+	struct uart_port port;
+	int port_type;
+	int ret;
+
+	port_type = (unsigned long)id->data;
+	ret = of_platform_serial_setup(ofdev, port_type, &port);
+	if (ret)
+		goto out;
+
+	switch (port_type) {
+	case PORT_UNKNOWN:
+		dev_info(&ofdev->dev, "Unknown serial port found, "
+			"attempting to use 8250 driver\n");
+		/* fallthrough */
+	case PORT_8250 ... PORT_MAX_8250:
+		ret = serial8250_register_port(&port);
+		break;
+	default:
+		/* need to add code for these */
+		ret = -ENODEV;
+		break;
+	}
+	if (ret < 0)
+		goto out;
+
+	ofdev->dev.driver_data = (void *)(unsigned long)ret;
+	return 0;
+out:
+	irq_dispose_mapping(port.irq);
+	return ret;
+}
+
+/*
+ * Release a line
+ */
+static int of_platform_serial_remove(struct of_device *ofdev)
+{
+	int line = (unsigned long)ofdev->dev.driver_data;
+	serial8250_unregister_port(line);
+	return 0;
+}
+
+/*
+ * A few common types, add more as needed.
+ */
+static struct of_device_id __devinitdata of_platform_serial_table[] = {
+	{ .type = "serial", .compatible = "ns8250",   .data = (void *)PORT_8250, },
+	{ .type = "serial", .compatible = "ns16450",  .data = (void *)PORT_16450, },
+	{ .type = "serial", .compatible = "ns16550",  .data = (void *)PORT_16550, },
+	{ .type = "serial", .compatible = "ns16750",  .data = (void *)PORT_16750, },
+	{ .type = "serial",			      .data = (void *)PORT_UNKNOWN, },
+	{ /* end of list */ },
+};
+
+static struct of_platform_driver __devinitdata of_platform_serial_driver = {
+	.owner = THIS_MODULE,
+	.name = "of_serial",
+	.probe = of_platform_serial_probe,
+	.remove = of_platform_serial_remove,
+	.match_table = of_platform_serial_table,
+};
+
+static int __init of_platform_serial_init(void)
+{
+	return of_register_platform_driver(&of_platform_serial_driver);
+}
+module_init(of_platform_serial_init);
+
+static void __exit of_platform_serial_exit(void)
+{
+	return of_unregister_platform_driver(&of_platform_serial_driver);
+};
+module_exit(of_platform_serial_exit);
+
+MODULE_AUTHOR("Arnd Bergmann <arnd at arndb.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");
Index: linux-2.6/drivers/serial/Kconfig
===================================================================
--- linux-2.6.orig/drivers/serial/Kconfig
+++ linux-2.6/drivers/serial/Kconfig
@@ -965,4 +965,14 @@ config SERIAL_NETX_CONSOLE
 	  If you have enabled the serial port on the Motorola IMX
 	  CPU you can make it the console by answering Y to this option.
 
+config SERIAL_OF_PLATFORM
+	tristate "Serial port on Open Firmware platform bus"
+	depends on PPC_OF
+	depends on SERIAL_8250
+	help
+	  If you have a PowerPC based system that has serial ports
+	  on a platform specific bus, you should enable this option.
+	  Currently, only 8250 compatible ports are supported, but
+	  others can easily be added.
+
 endmenu