[deliverable/linux.git] / drivers / serial / of_serial.c

/*
 *  Serial Port driver for Open Firmware platform devices
 *
 *    Copyright (C) 2006 Arnd Bergmann <arnd@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>

struct of_serial_info {
	int type;
	int line;
};

/*
 * 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 = of_get_property(np, "current-speed", NULL);
	clk = of_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
		| UPF_FIXED_PORT;
	port->dev = &ofdev->dev;
	/* If current-speed was set, then try not to change it. */
	if (spd)
		port->custom_divisor = *clk / (16 * (*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 of_serial_info *info;
	struct uart_port port;
	int port_type;
	int ret;

	if (of_find_property(ofdev->node, "used-by-rtas", NULL))
		return -EBUSY;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL)
		return -ENOMEM;

	port_type = (unsigned long)id->data;
	ret = of_platform_serial_setup(ofdev, port_type, &port);
	if (ret)
		goto out;

	switch (port_type) {
	case PORT_8250 ... PORT_MAX_8250:
		ret = serial8250_register_port(&port);
		break;
	default:
		/* need to add code for these */
	case PORT_UNKNOWN:
		dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
		ret = -ENODEV;
		break;
	}
	if (ret < 0)
		goto out;

	info->type = port_type;
	info->line = ret;
	ofdev->dev.driver_data = info;
	return 0;
out:
	kfree(info);
	irq_dispose_mapping(port.irq);
	return ret;
}

/*
 * Release a line
 */
static int of_platform_serial_remove(struct of_device *ofdev)
{
	struct of_serial_info *info = ofdev->dev.driver_data;
	switch (info->type) {
	case PORT_8250 ... PORT_MAX_8250:
		serial8250_unregister_port(info->line);
		break;
	default:
		/* need to add code for these */
		break;
	}
	kfree(info);
	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 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@arndb.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");
Commit	Line	Data
8d38a5b2 AB	1	/*
	2	* Serial Port driver for Open Firmware platform devices
	3	*
	4	* Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	*/
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/serial_core.h>
	15	#include <linux/serial_8250.h>
	16
	17	#include <asm/of_platform.h>
	18	#include <asm/prom.h>
	19
e34b9c94 IK	20	struct of_serial_info {
	21	int type;
	22	int line;
	23	};
	24
8d38a5b2 AB	25	/*
	26	* Fill a struct uart_port for a given device node
	27	*/
	28	static int __devinit of_platform_serial_setup(struct of_device *ofdev,
	29	int type, struct uart_port *port)
	30	{
	31	struct resource resource;
	32	struct device_node *np = ofdev->node;
	33	const unsigned int clk, spd;
	34	int ret;
	35
	36	memset(port, 0, sizeof *port);
40cd3a45 SR	37	spd = of_get_property(np, "current-speed", NULL);
40cd3a45 SR	38	clk = of_get_property(np, "clock-frequency", NULL);
8d38a5b2 AB	39	if (!clk) {
	40	dev_warn(&ofdev->dev, "no clock-frequency property set\n");
	41	return -ENODEV;
	42	}
	43
	44	ret = of_address_to_resource(np, 0, &resource);
	45	if (ret) {
	46	dev_warn(&ofdev->dev, "invalid address\n");
	47	return ret;
	48	}
	49
	50	spin_lock_init(&port->lock);
	51	port->mapbase = resource.start;
	52	port->irq = irq_of_parse_and_map(np, 0);
	53	port->iotype = UPIO_MEM;
	54	port->type = type;
	55	port->uartclk = *clk;
abb4a239 DG	56	port->flags = UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF \| UPF_IOREMAP
abb4a239 DG	57	\| UPF_FIXED_PORT;
8d38a5b2	58	port->dev = &ofdev->dev;
19a74263 SN	59	/* If current-speed was set, then try not to change it. */
	60	if (spd)
	61	port->custom_divisor = clk / (16 (*spd));
8d38a5b2 AB	62
	63	return 0;
	64	}
	65
	66	/*
	67	* Try to register a serial port
	68	*/
	69	static int __devinit of_platform_serial_probe(struct of_device *ofdev,
	70	const struct of_device_id *id)
	71	{
e34b9c94	72	struct of_serial_info *info;
8d38a5b2 AB	73	struct uart_port port;
	74	int port_type;
	75	int ret;
	76
	77	if (of_find_property(ofdev->node, "used-by-rtas", NULL))
	78	return -EBUSY;
	79
e34b9c94 IK	80	info = kmalloc(sizeof(*info), GFP_KERNEL);
	81	if (info == NULL)
	82	return -ENOMEM;
	83
8d38a5b2 AB	84	port_type = (unsigned long)id->data;
	85	ret = of_platform_serial_setup(ofdev, port_type, &port);
	86	if (ret)
	87	goto out;
	88
	89	switch (port_type) {
8d38a5b2 AB	90	case PORT_8250 ... PORT_MAX_8250:
	91	ret = serial8250_register_port(&port);
	92	break;
	93	default:
	94	/* need to add code for these */
1558f9b4 IK	95	case PORT_UNKNOWN:
1558f9b4 IK	96	dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
8d38a5b2 AB	97	ret = -ENODEV;
	98	break;
	99	}
	100	if (ret < 0)
	101	goto out;
	102
e34b9c94 IK	103	info->type = port_type;
	104	info->line = ret;
	105	ofdev->dev.driver_data = info;
8d38a5b2 AB	106	return 0;
8d38a5b2 AB	107	out:
e34b9c94	108	kfree(info);
8d38a5b2 AB	109	irq_dispose_mapping(port.irq);
	110	return ret;
	111	}
	112
	113	/*
	114	* Release a line
	115	*/
	116	static int of_platform_serial_remove(struct of_device *ofdev)
	117	{
e34b9c94 IK	118	struct of_serial_info *info = ofdev->dev.driver_data;
	119	switch (info->type) {
	120	case PORT_8250 ... PORT_MAX_8250:
	121	serial8250_unregister_port(info->line);
	122	break;
	123	default:
	124	/* need to add code for these */
	125	break;
	126	}
	127	kfree(info);
8d38a5b2 AB	128	return 0;
	129	}
	130
	131	/*
	132	* A few common types, add more as needed.
	133	*/
	134	static struct of_device_id __devinitdata of_platform_serial_table[] = {
	135	{ .type = "serial", .compatible = "ns8250", .data = (void *)PORT_8250, },
	136	{ .type = "serial", .compatible = "ns16450", .data = (void *)PORT_16450, },
	137	{ .type = "serial", .compatible = "ns16550", .data = (void *)PORT_16550, },
	138	{ .type = "serial", .compatible = "ns16750", .data = (void *)PORT_16750, },
	139	{ .type = "serial", .data = (void *)PORT_UNKNOWN, },
	140	{ /* end of list */ },
	141	};
	142
e84290dc	143	static struct of_platform_driver of_platform_serial_driver = {
8d38a5b2 AB	144	.owner = THIS_MODULE,
	145	.name = "of_serial",
	146	.probe = of_platform_serial_probe,
	147	.remove = of_platform_serial_remove,
	148	.match_table = of_platform_serial_table,
	149	};
	150
	151	static int __init of_platform_serial_init(void)
	152	{
	153	return of_register_platform_driver(&of_platform_serial_driver);
	154	}
	155	module_init(of_platform_serial_init);
	156
	157	static void __exit of_platform_serial_exit(void)
	158	{
	159	return of_unregister_platform_driver(&of_platform_serial_driver);
	160	};
	161	module_exit(of_platform_serial_exit);
	162
	163	MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
	164	MODULE_LICENSE("GPL");
	165	MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");