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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;
106
107 tx_irq = platform_get_irq(dev, 1);
108 if (tx_irq < 0)
109 return tx_irq;
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 void 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
145static struct platform_driver rpckbd_driver = {
146 .probe = rpckbd_probe,
147 .remove_new = rpckbd_remove,
148 .driver = {
149 .name = "kart",
150 },
151};
152module_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/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 },
172};
173module_platform_driver(rpckbd_driver);