[net-next-2.6.git] / drivers / input / serio / ambakmi.c

/*
 *  linux/drivers/input/serio/ambakmi.c
 *
 *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
 *  Copyright (C) 2002 Russell King.
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/amba/bus.h>
#include <linux/amba/kmi.h>
#include <linux/clk.h>

#include <asm/io.h>
#include <asm/irq.h>

#define KMI_BASE	(kmi->base)

struct amba_kmi_port {
	struct serio		*io;
	struct clk		*clk;
	void __iomem		*base;
	unsigned int		irq;
	unsigned int		divisor;
	unsigned int		open;
};

static irqreturn_t amba_kmi_int(int irq, void *dev_id)
{
	struct amba_kmi_port *kmi = dev_id;
	unsigned int status = readb(KMIIR);
	int handled = IRQ_NONE;

	while (status & KMIIR_RXINTR) {
		serio_interrupt(kmi->io, readb(KMIDATA), 0);
		status = readb(KMIIR);
		handled = IRQ_HANDLED;
	}

	return handled;
}

static int amba_kmi_write(struct serio *io, unsigned char val)
{
	struct amba_kmi_port *kmi = io->port_data;
	unsigned int timeleft = 10000; /* timeout in 100ms */

	while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && timeleft--)
		udelay(10);

	if (timeleft)
		writeb(val, KMIDATA);

	return timeleft ? 0 : SERIO_TIMEOUT;
}

static int amba_kmi_open(struct serio *io)
{
	struct amba_kmi_port *kmi = io->port_data;
	unsigned int divisor;
	int ret;

	ret = clk_enable(kmi->clk);
	if (ret)
		goto out;

	divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
	writeb(divisor, KMICLKDIV);
	writeb(KMICR_EN, KMICR);

	ret = request_irq(kmi->irq, amba_kmi_int, 0, "kmi-pl050", kmi);
	if (ret) {
		printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
		writeb(0, KMICR);
		goto clk_disable;
	}

	writeb(KMICR_EN | KMICR_RXINTREN, KMICR);

	return 0;

 clk_disable:
	clk_disable(kmi->clk);
 out:
	return ret;
}

static void amba_kmi_close(struct serio *io)
{
	struct amba_kmi_port *kmi = io->port_data;

	writeb(0, KMICR);

	free_irq(kmi->irq, kmi);
	clk_disable(kmi->clk);
}

static int amba_kmi_probe(struct amba_device *dev, void *id)
{
	struct amba_kmi_port *kmi;
	struct serio *io;
	int ret;

	ret = amba_request_regions(dev, NULL);
	if (ret)
		return ret;

	kmi = kmalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
	io = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (!kmi || !io) {
		ret = -ENOMEM;
		goto out;
	}

	memset(kmi, 0, sizeof(struct amba_kmi_port));
	memset(io, 0, sizeof(struct serio));

	io->id.type	= SERIO_8042;
	io->write	= amba_kmi_write;
	io->open	= amba_kmi_open;
	io->close	= amba_kmi_close;
	strlcpy(io->name, dev->dev.bus_id, sizeof(io->name));
	strlcpy(io->phys, dev->dev.bus_id, sizeof(io->phys));
	io->port_data	= kmi;
	io->dev.parent	= &dev->dev;

	kmi->io 	= io;
	kmi->base	= ioremap(dev->res.start, KMI_SIZE);
	if (!kmi->base) {
		ret = -ENOMEM;
		goto out;
	}

	kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
	if (IS_ERR(kmi->clk)) {
		ret = PTR_ERR(kmi->clk);
		goto unmap;
	}

	kmi->irq = dev->irq[0];
	amba_set_drvdata(dev, kmi);

	serio_register_port(kmi->io);
	return 0;

 unmap:
	iounmap(kmi->base);
 out:
	kfree(kmi);
	kfree(io);
	amba_release_regions(dev);
	return ret;
}

static int amba_kmi_remove(struct amba_device *dev)
{
	struct amba_kmi_port *kmi = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	serio_unregister_port(kmi->io);
	clk_put(kmi->clk);
	iounmap(kmi->base);
	kfree(kmi);
	amba_release_regions(dev);
	return 0;
}

static int amba_kmi_resume(struct amba_device *dev)
{
	struct amba_kmi_port *kmi = amba_get_drvdata(dev);

	/* kick the serio layer to rescan this port */
	serio_reconnect(kmi->io);

	return 0;
}

static struct amba_id amba_kmi_idtable[] = {
	{
		.id	= 0x00041050,
		.mask	= 0x000fffff,
	},
	{ 0, 0 }
};

static struct amba_driver ambakmi_driver = {
	.drv		= {
		.name	= "kmi-pl050",
	},
	.id_table	= amba_kmi_idtable,
	.probe		= amba_kmi_probe,
	.remove		= amba_kmi_remove,
	.resume		= amba_kmi_resume,
};

static int __init amba_kmi_init(void)
{
	return amba_driver_register(&ambakmi_driver);
}

static void __exit amba_kmi_exit(void)
{
	amba_driver_unregister(&ambakmi_driver);
}

module_init(amba_kmi_init);
module_exit(amba_kmi_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("AMBA KMI controller driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/input/serio/ambakmi.c
	3	*
	4	* Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
	5	* Copyright (C) 2002 Russell King.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*/
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/serio.h>
	15	#include <linux/errno.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/ioport.h>
	18	#include <linux/device.h>
	19	#include <linux/delay.h>
	20	#include <linux/slab.h>
	21	#include <linux/err.h>
a62c80e5 RK	22	#include <linux/amba/bus.h>
a62c80e5 RK	23	#include <linux/amba/kmi.h>
f8ce2547	24	#include <linux/clk.h>
1da177e4 LT	25
	26	#include <asm/io.h>
	27	#include <asm/irq.h>
1da177e4 LT	28
	29	#define KMI_BASE (kmi->base)
	30
	31	struct amba_kmi_port {
	32	struct serio *io;
	33	struct clk *clk;
	34	void __iomem *base;
	35	unsigned int irq;
	36	unsigned int divisor;
	37	unsigned int open;
	38	};
	39
7d12e780	40	static irqreturn_t amba_kmi_int(int irq, void *dev_id)
1da177e4 LT	41	{
	42	struct amba_kmi_port *kmi = dev_id;
	43	unsigned int status = readb(KMIIR);
	44	int handled = IRQ_NONE;
	45
	46	while (status & KMIIR_RXINTR) {
7d12e780	47	serio_interrupt(kmi->io, readb(KMIDATA), 0);
1da177e4 LT	48	status = readb(KMIIR);
	49	handled = IRQ_HANDLED;
	50	}
	51
	52	return handled;
	53	}
	54
	55	static int amba_kmi_write(struct serio *io, unsigned char val)
	56	{
	57	struct amba_kmi_port *kmi = io->port_data;
	58	unsigned int timeleft = 10000; /* timeout in 100ms */
	59
	60	while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && timeleft--)
	61	udelay(10);
	62
	63	if (timeleft)
	64	writeb(val, KMIDATA);
	65
	66	return timeleft ? 0 : SERIO_TIMEOUT;
	67	}
	68
	69	static int amba_kmi_open(struct serio *io)
	70	{
	71	struct amba_kmi_port *kmi = io->port_data;
	72	unsigned int divisor;
	73	int ret;
	74
1da177e4 LT	75	ret = clk_enable(kmi->clk);
1da177e4 LT	76	if (ret)
a8d3584a	77	goto out;
1da177e4 LT	78
	79	divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
	80	writeb(divisor, KMICLKDIV);
	81	writeb(KMICR_EN, KMICR);
	82
	83	ret = request_irq(kmi->irq, amba_kmi_int, 0, "kmi-pl050", kmi);
	84	if (ret) {
	85	printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
	86	writeb(0, KMICR);
	87	goto clk_disable;
	88	}
	89
	90	writeb(KMICR_EN \| KMICR_RXINTREN, KMICR);
	91
	92	return 0;
	93
	94	clk_disable:
	95	clk_disable(kmi->clk);
1da177e4 LT	96	out:
	97	return ret;
	98	}
	99
	100	static void amba_kmi_close(struct serio *io)
	101	{
	102	struct amba_kmi_port *kmi = io->port_data;
	103
	104	writeb(0, KMICR);
	105
	106	free_irq(kmi->irq, kmi);
	107	clk_disable(kmi->clk);
1da177e4 LT	108	}
	109
	110	static int amba_kmi_probe(struct amba_device dev, void id)
	111	{
	112	struct amba_kmi_port *kmi;
	113	struct serio *io;
	114	int ret;
	115
	116	ret = amba_request_regions(dev, NULL);
	117	if (ret)
	118	return ret;
	119
	120	kmi = kmalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
	121	io = kmalloc(sizeof(struct serio), GFP_KERNEL);
	122	if (!kmi \|\| !io) {
	123	ret = -ENOMEM;
	124	goto out;
	125	}
	126
	127	memset(kmi, 0, sizeof(struct amba_kmi_port));
	128	memset(io, 0, sizeof(struct serio));
	129
	130	io->id.type = SERIO_8042;
	131	io->write = amba_kmi_write;
	132	io->open = amba_kmi_open;
	133	io->close = amba_kmi_close;
	134	strlcpy(io->name, dev->dev.bus_id, sizeof(io->name));
	135	strlcpy(io->phys, dev->dev.bus_id, sizeof(io->phys));
	136	io->port_data = kmi;
	137	io->dev.parent = &dev->dev;
	138
	139	kmi->io = io;
	140	kmi->base = ioremap(dev->res.start, KMI_SIZE);
	141	if (!kmi->base) {
	142	ret = -ENOMEM;
	143	goto out;
	144	}
	145
	146	kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
	147	if (IS_ERR(kmi->clk)) {
	148	ret = PTR_ERR(kmi->clk);
	149	goto unmap;
	150	}
	151
	152	kmi->irq = dev->irq[0];
	153	amba_set_drvdata(dev, kmi);
	154
	155	serio_register_port(kmi->io);
	156	return 0;
	157
	158	unmap:
	159	iounmap(kmi->base);
	160	out:
	161	kfree(kmi);
	162	kfree(io);
	163	amba_release_regions(dev);
	164	return ret;
	165	}
	166
	167	static int amba_kmi_remove(struct amba_device *dev)
	168	{
	169	struct amba_kmi_port *kmi = amba_get_drvdata(dev);
	170
	171	amba_set_drvdata(dev, NULL);
172
173	serio_unregister_port(kmi->io);
174	clk_put(kmi->clk);
175	iounmap(kmi->base);
176	kfree(kmi);
177	amba_release_regions(dev);
178	return 0;
179	}
180
181	static int amba_kmi_resume(struct amba_device *dev)
182	{
183	struct amba_kmi_port *kmi = amba_get_drvdata(dev);
184
185	/* kick the serio layer to rescan this port */
186	serio_reconnect(kmi->io);
187
188	return 0;
189	}
190
191	static struct amba_id amba_kmi_idtable[] = {
192	{
193	.id = 0x00041050,
194	.mask = 0x000fffff,
195	},
196	{ 0, 0 }
197	};
198
199	static struct amba_driver ambakmi_driver = {
200	.drv = {
201	.name = "kmi-pl050",
202	},
203	.id_table = amba_kmi_idtable,
204	.probe = amba_kmi_probe,
205	.remove = amba_kmi_remove,
206	.resume = amba_kmi_resume,
207	};
208
209	static int __init amba_kmi_init(void)
210	{
211	return amba_driver_register(&ambakmi_driver);
212	}
213
214	static void __exit amba_kmi_exit(void)
215	{
216	amba_driver_unregister(&ambakmi_driver);
217	}
218
219	module_init(amba_kmi_init);
220	module_exit(amba_kmi_exit);
221
222	MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
223	MODULE_DESCRIPTION("AMBA KMI controller driver");
224	MODULE_LICENSE("GPL");