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1/*
2 *  Copyright (c) 2000-2001 Vojtech Pavlik
3 *  Copyright (c) 2002 Russell King
4 */
5
6/*
7 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
8 */
9
10/*
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 * Should you need to contact me, the author, you can do so either by
26 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
27 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
28 */
29
30#include <linux/module.h>
31#include <linux/interrupt.h>
32#include <linux/serio.h>
33#include <linux/err.h>
34#include <linux/platform_device.h>
35#include <linux/io.h>
36#include <linux/slab.h>
37
38#include <mach/hardware.h>
39#include <asm/hardware/iomd.h>
40
41MODULE_AUTHOR("Vojtech Pavlik, Russell King");
42MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
43MODULE_LICENSE("GPL");
44MODULE_ALIAS("platform:kart");
45
46struct rpckbd_data {
47	int tx_irq;
48	int rx_irq;
49};
50
51static int rpckbd_write(struct serio *port, unsigned char val)
52{
53	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
54		cpu_relax();
55
56	iomd_writeb(val, IOMD_KARTTX);
57
58	return 0;
59}
60
61static irqreturn_t rpckbd_rx(int irq, void *dev_id)
62{
63	struct serio *port = dev_id;
64	unsigned int byte;
65	int handled = IRQ_NONE;
66
67	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
68		byte = iomd_readb(IOMD_KARTRX);
69
70		serio_interrupt(port, byte, 0);
71		handled = IRQ_HANDLED;
72	}
73	return handled;
74}
75
76static irqreturn_t rpckbd_tx(int irq, void *dev_id)
77{
78	return IRQ_HANDLED;
79}
80
81static int rpckbd_open(struct serio *port)
82{
83	struct rpckbd_data *rpckbd = port->port_data;
84
85	/* Reset the keyboard state machine. */
86	iomd_writeb(0, IOMD_KCTRL);
87	iomd_writeb(8, IOMD_KCTRL);
88	iomd_readb(IOMD_KARTRX);
89
90	if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
91		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
92		return -EBUSY;
93	}
94
95	if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
96		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
97		free_irq(rpckbd->rx_irq, port);
98		return -EBUSY;
99	}
100
101	return 0;
102}
103
104static void rpckbd_close(struct serio *port)
105{
106	struct rpckbd_data *rpckbd = port->port_data;
107
108	free_irq(rpckbd->rx_irq, port);
109	free_irq(rpckbd->tx_irq, port);
110}
111
112/*
113 * Allocate and initialize serio structure for subsequent registration
114 * with serio core.
115 */
116static int rpckbd_probe(struct platform_device *dev)
117{
118	struct rpckbd_data *rpckbd;
119	struct serio *serio;
120	int tx_irq, rx_irq;
121
122	rx_irq = platform_get_irq(dev, 0);
123	if (rx_irq <= 0)
124		return rx_irq < 0 ? rx_irq : -ENXIO;
125
126	tx_irq = platform_get_irq(dev, 1);
127	if (tx_irq <= 0)
128		return tx_irq < 0 ? tx_irq : -ENXIO;
129
130	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
131	rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
132	if (!serio || !rpckbd) {
133		kfree(rpckbd);
134		kfree(serio);
135		return -ENOMEM;
136	}
137
138	rpckbd->rx_irq = rx_irq;
139	rpckbd->tx_irq = tx_irq;
140
141	serio->id.type		= SERIO_8042;
142	serio->write		= rpckbd_write;
143	serio->open		= rpckbd_open;
144	serio->close		= rpckbd_close;
145	serio->dev.parent	= &dev->dev;
146	serio->port_data	= rpckbd;
147	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
148	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
149
150	platform_set_drvdata(dev, serio);
151	serio_register_port(serio);
152	return 0;
153}
154
155static int rpckbd_remove(struct platform_device *dev)
156{
157	struct serio *serio = platform_get_drvdata(dev);
158	struct rpckbd_data *rpckbd = serio->port_data;
159
160	serio_unregister_port(serio);
161	kfree(rpckbd);
162
163	return 0;
164}
165
166static struct platform_driver rpckbd_driver = {
167	.probe		= rpckbd_probe,
168	.remove		= rpckbd_remove,
169	.driver		= {
170		.name	= "kart",
171		.owner	= THIS_MODULE,
172	},
173};
174module_platform_driver(rpckbd_driver);
175