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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2000-2001 Vojtech Pavlik
4 * Copyright (c) 2002 Russell King
5 */
6
7/*
8 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
9 */
10
11#include <linux/module.h>
12#include <linux/interrupt.h>
13#include <linux/serio.h>
14#include <linux/err.h>
15#include <linux/platform_device.h>
16#include <linux/io.h>
17#include <linux/slab.h>
18
19#include <mach/hardware.h>
20#include <asm/hardware/iomd.h>
21
22MODULE_AUTHOR("Vojtech Pavlik, Russell King");
23MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
24MODULE_LICENSE("GPL");
25MODULE_ALIAS("platform:kart");
26
27struct rpckbd_data {
28 int tx_irq;
29 int rx_irq;
30};
31
32static int rpckbd_write(struct serio *port, unsigned char val)
33{
34 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
35 cpu_relax();
36
37 iomd_writeb(val, IOMD_KARTTX);
38
39 return 0;
40}
41
42static irqreturn_t rpckbd_rx(int irq, void *dev_id)
43{
44 struct serio *port = dev_id;
45 unsigned int byte;
46 int handled = IRQ_NONE;
47
48 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
49 byte = iomd_readb(IOMD_KARTRX);
50
51 serio_interrupt(port, byte, 0);
52 handled = IRQ_HANDLED;
53 }
54 return handled;
55}
56
57static irqreturn_t rpckbd_tx(int irq, void *dev_id)
58{
59 return IRQ_HANDLED;
60}
61
62static int rpckbd_open(struct serio *port)
63{
64 struct rpckbd_data *rpckbd = port->port_data;
65
66 /* Reset the keyboard state machine. */
67 iomd_writeb(0, IOMD_KCTRL);
68 iomd_writeb(8, IOMD_KCTRL);
69 iomd_readb(IOMD_KARTRX);
70
71 if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
72 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
73 return -EBUSY;
74 }
75
76 if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
77 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
78 free_irq(rpckbd->rx_irq, port);
79 return -EBUSY;
80 }
81
82 return 0;
83}
84
85static void rpckbd_close(struct serio *port)
86{
87 struct rpckbd_data *rpckbd = port->port_data;
88
89 free_irq(rpckbd->rx_irq, port);
90 free_irq(rpckbd->tx_irq, port);
91}
92
93/*
94 * Allocate and initialize serio structure for subsequent registration
95 * with serio core.
96 */
97static int rpckbd_probe(struct platform_device *dev)
98{
99 struct rpckbd_data *rpckbd;
100 struct serio *serio;
101 int tx_irq, rx_irq;
102
103 rx_irq = platform_get_irq(dev, 0);
104 if (rx_irq <= 0)
105 return rx_irq < 0 ? rx_irq : -ENXIO;
106
107 tx_irq = platform_get_irq(dev, 1);
108 if (tx_irq <= 0)
109 return tx_irq < 0 ? tx_irq : -ENXIO;
110
111 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
112 rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
113 if (!serio || !rpckbd) {
114 kfree(rpckbd);
115 kfree(serio);
116 return -ENOMEM;
117 }
118
119 rpckbd->rx_irq = rx_irq;
120 rpckbd->tx_irq = tx_irq;
121
122 serio->id.type = SERIO_8042;
123 serio->write = rpckbd_write;
124 serio->open = rpckbd_open;
125 serio->close = rpckbd_close;
126 serio->dev.parent = &dev->dev;
127 serio->port_data = rpckbd;
128 strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
129 strscpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
130
131 platform_set_drvdata(dev, serio);
132 serio_register_port(serio);
133 return 0;
134}
135
136static int rpckbd_remove(struct platform_device *dev)
137{
138 struct serio *serio = platform_get_drvdata(dev);
139 struct rpckbd_data *rpckbd = serio->port_data;
140
141 serio_unregister_port(serio);
142 kfree(rpckbd);
143
144 return 0;
145}
146
147static struct platform_driver rpckbd_driver = {
148 .probe = rpckbd_probe,
149 .remove = rpckbd_remove,
150 .driver = {
151 .name = "kart",
152 },
153};
154module_platform_driver(rpckbd_driver);
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/init.h>
33#include <linux/serio.h>
34#include <linux/err.h>
35#include <linux/platform_device.h>
36#include <linux/io.h>
37#include <linux/slab.h>
38
39#include <asm/irq.h>
40#include <mach/hardware.h>
41#include <asm/hardware/iomd.h>
42#include <asm/system.h>
43
44MODULE_AUTHOR("Vojtech Pavlik, Russell King");
45MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
46MODULE_LICENSE("GPL");
47MODULE_ALIAS("platform:kart");
48
49static int rpckbd_write(struct serio *port, unsigned char val)
50{
51 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
52 cpu_relax();
53
54 iomd_writeb(val, IOMD_KARTTX);
55
56 return 0;
57}
58
59static irqreturn_t rpckbd_rx(int irq, void *dev_id)
60{
61 struct serio *port = dev_id;
62 unsigned int byte;
63 int handled = IRQ_NONE;
64
65 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
66 byte = iomd_readb(IOMD_KARTRX);
67
68 serio_interrupt(port, byte, 0);
69 handled = IRQ_HANDLED;
70 }
71 return handled;
72}
73
74static irqreturn_t rpckbd_tx(int irq, void *dev_id)
75{
76 return IRQ_HANDLED;
77}
78
79static int rpckbd_open(struct serio *port)
80{
81 /* Reset the keyboard state machine. */
82 iomd_writeb(0, IOMD_KCTRL);
83 iomd_writeb(8, IOMD_KCTRL);
84 iomd_readb(IOMD_KARTRX);
85
86 if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
87 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
88 return -EBUSY;
89 }
90
91 if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
92 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
93 free_irq(IRQ_KEYBOARDRX, port);
94 return -EBUSY;
95 }
96
97 return 0;
98}
99
100static void rpckbd_close(struct serio *port)
101{
102 free_irq(IRQ_KEYBOARDRX, port);
103 free_irq(IRQ_KEYBOARDTX, port);
104}
105
106/*
107 * Allocate and initialize serio structure for subsequent registration
108 * with serio core.
109 */
110static int __devinit rpckbd_probe(struct platform_device *dev)
111{
112 struct serio *serio;
113
114 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
115 if (!serio)
116 return -ENOMEM;
117
118 serio->id.type = SERIO_8042;
119 serio->write = rpckbd_write;
120 serio->open = rpckbd_open;
121 serio->close = rpckbd_close;
122 serio->dev.parent = &dev->dev;
123 strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
124 strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
125
126 platform_set_drvdata(dev, serio);
127 serio_register_port(serio);
128 return 0;
129}
130
131static int __devexit rpckbd_remove(struct platform_device *dev)
132{
133 struct serio *serio = platform_get_drvdata(dev);
134 serio_unregister_port(serio);
135 return 0;
136}
137
138static struct platform_driver rpckbd_driver = {
139 .probe = rpckbd_probe,
140 .remove = __devexit_p(rpckbd_remove),
141 .driver = {
142 .name = "kart",
143 .owner = THIS_MODULE,
144 },
145};
146
147static int __init rpckbd_init(void)
148{
149 return platform_driver_register(&rpckbd_driver);
150}
151
152static void __exit rpckbd_exit(void)
153{
154 platform_driver_unregister(&rpckbd_driver);
155}
156
157module_init(rpckbd_init);
158module_exit(rpckbd_exit);