[deliverable/linux.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/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_prepare_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, IRQF_SHARED, "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_unprepare(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_unprepare(kmi->clk);
}

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

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

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


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

	kmi->io		= io;
	kmi->base	= ioremap(dev->res.start, resource_size(&dev->res));
	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);

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

static int __maybe_unused amba_kmi_resume(struct device *dev)
{
	struct amba_kmi_port *kmi = dev_get_drvdata(dev);

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

	return 0;
}

static SIMPLE_DEV_PM_OPS(amba_kmi_dev_pm_ops, NULL, amba_kmi_resume);

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

MODULE_DEVICE_TABLE(amba, amba_kmi_idtable);

static struct amba_driver ambakmi_driver = {
	.drv		= {
		.name	= "kmi-pl050",
		.owner	= THIS_MODULE,
		.pm	= &amba_kmi_dev_pm_ops,
	},
	.id_table	= amba_kmi_idtable,
	.probe		= amba_kmi_probe,
	.remove		= amba_kmi_remove,
};

module_amba_driver(ambakmi_driver);

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>
1da177e4 LT	13	#include <linux/serio.h>
	14	#include <linux/errno.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/ioport.h>
	17	#include <linux/device.h>
	18	#include <linux/delay.h>
	19	#include <linux/slab.h>
	20	#include <linux/err.h>
a62c80e5 RK	21	#include <linux/amba/bus.h>
a62c80e5 RK	22	#include <linux/amba/kmi.h>
f8ce2547	23	#include <linux/clk.h>
1da177e4 LT	24
	25	#include <asm/io.h>
	26	#include <asm/irq.h>
1da177e4 LT	27
	28	#define KMI_BASE (kmi->base)
	29
	30	struct amba_kmi_port {
	31	struct serio *io;
	32	struct clk *clk;
	33	void __iomem *base;
	34	unsigned int irq;
	35	unsigned int divisor;
	36	unsigned int open;
	37	};
	38
7d12e780	39	static irqreturn_t amba_kmi_int(int irq, void *dev_id)
1da177e4 LT	40	{
	41	struct amba_kmi_port *kmi = dev_id;
	42	unsigned int status = readb(KMIIR);
	43	int handled = IRQ_NONE;
	44
	45	while (status & KMIIR_RXINTR) {
7d12e780	46	serio_interrupt(kmi->io, readb(KMIDATA), 0);
1da177e4 LT	47	status = readb(KMIIR);
	48	handled = IRQ_HANDLED;
	49	}
	50
	51	return handled;
	52	}
	53
	54	static int amba_kmi_write(struct serio *io, unsigned char val)
	55	{
	56	struct amba_kmi_port *kmi = io->port_data;
	57	unsigned int timeleft = 10000; /* timeout in 100ms */
	58
4ab73761	59	while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && --timeleft)
1da177e4 LT	60	udelay(10);
	61
	62	if (timeleft)
	63	writeb(val, KMIDATA);
	64
	65	return timeleft ? 0 : SERIO_TIMEOUT;
	66	}
	67
	68	static int amba_kmi_open(struct serio *io)
	69	{
	70	struct amba_kmi_port *kmi = io->port_data;
	71	unsigned int divisor;
	72	int ret;
	73
59d1f5c4	74	ret = clk_prepare_enable(kmi->clk);
1da177e4	75	if (ret)
a8d3584a	76	goto out;
1da177e4 LT	77
	78	divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
	79	writeb(divisor, KMICLKDIV);
	80	writeb(KMICR_EN, KMICR);
	81
5d61b54f LD	82	ret = request_irq(kmi->irq, amba_kmi_int, IRQF_SHARED, "kmi-pl050",
5d61b54f LD	83	kmi);
1da177e4 LT	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:
59d1f5c4	95	clk_disable_unprepare(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);
59d1f5c4	107	clk_disable_unprepare(kmi->clk);
1da177e4 LT	108	}
1da177e4 LT	109
5298cc4c	110	static int amba_kmi_probe(struct amba_device *dev,
aa25afad	111	const struct amba_id *id)
1da177e4 LT	112	{
	113	struct amba_kmi_port *kmi;
	114	struct serio *io;
	115	int ret;
	116
	117	ret = amba_request_regions(dev, NULL);
	118	if (ret)
	119	return ret;
	120
dd00cc48 YP	121	kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
dd00cc48 YP	122	io = kzalloc(sizeof(struct serio), GFP_KERNEL);
1da177e4 LT	123	if (!kmi \|\| !io) {
	124	ret = -ENOMEM;
	125	goto out;
	126	}
	127
1da177e4 LT	128
	129	io->id.type = SERIO_8042;
	130	io->write = amba_kmi_write;
	131	io->open = amba_kmi_open;
	132	io->close = amba_kmi_close;
4e8718a1 KS	133	strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name));
4e8718a1 KS	134	strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys));
1da177e4 LT	135	io->port_data = kmi;
	136	io->dev.parent = &dev->dev;
	137
266429df	138	kmi->io = io;
dc890c2d	139	kmi->base = ioremap(dev->res.start, resource_size(&dev->res));
1da177e4 LT	140	if (!kmi->base) {
	141	ret = -ENOMEM;
	142	goto out;
	143	}
	144
	145	kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
	146	if (IS_ERR(kmi->clk)) {
	147	ret = PTR_ERR(kmi->clk);
	148	goto unmap;
	149	}
	150
	151	kmi->irq = dev->irq[0];
	152	amba_set_drvdata(dev, kmi);
	153
	154	serio_register_port(kmi->io);
	155	return 0;
	156
	157	unmap:
	158	iounmap(kmi->base);
	159	out:
	160	kfree(kmi);
	161	kfree(io);
	162	amba_release_regions(dev);
	163	return ret;
	164	}
	165
e2619cf7	166	static int amba_kmi_remove(struct amba_device *dev)
1da177e4 LT	167	{
	168	struct amba_kmi_port *kmi = amba_get_drvdata(dev);
	169
1da177e4 LT	170	serio_unregister_port(kmi->io);
	171	clk_put(kmi->clk);
	172	iounmap(kmi->base);
	173	kfree(kmi);
	174	amba_release_regions(dev);
	175	return 0;
	176	}
	177
cee3d8cc	178	static int __maybe_unused amba_kmi_resume(struct device *dev)
1da177e4	179	{
cee3d8cc	180	struct amba_kmi_port *kmi = dev_get_drvdata(dev);
1da177e4 LT	181
	182	/* kick the serio layer to rescan this port */
	183	serio_reconnect(kmi->io);
	184
	185	return 0;
	186	}
	187
cee3d8cc UH	188	static SIMPLE_DEV_PM_OPS(amba_kmi_dev_pm_ops, NULL, amba_kmi_resume);
cee3d8cc UH	189
1da177e4 LT	190	static struct amba_id amba_kmi_idtable[] = {
	191	{
	192	.id = 0x00041050,
	193	.mask = 0x000fffff,
	194	},
	195	{ 0, 0 }
	196	};
	197
2dfff235 DM	198	MODULE_DEVICE_TABLE(amba, amba_kmi_idtable);
2dfff235 DM	199
1da177e4 LT	200	static struct amba_driver ambakmi_driver = {
	201	.drv = {
	202	.name = "kmi-pl050",
898d1053	203	.owner = THIS_MODULE,
cee3d8cc	204	.pm = &amba_kmi_dev_pm_ops,
1da177e4 LT	205	},
	206	.id_table = amba_kmi_idtable,
	207	.probe = amba_kmi_probe,
1cb0aa88	208	.remove = amba_kmi_remove,
1da177e4 LT	209	};
1da177e4 LT	210
9e5ed094	211	module_amba_driver(ambakmi_driver);
1da177e4 LT	212
	213	MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
	214	MODULE_DESCRIPTION("AMBA KMI controller driver");
	215	MODULE_LICENSE("GPL");