1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* 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, 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, 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");
|
