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
|
/* auxio.c: Probing for the Sparc AUXIO register at boot time.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*
* Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/auxio.h>
void __iomem *auxio_register = NULL;
EXPORT_SYMBOL(auxio_register);
enum auxio_type {
AUXIO_TYPE_NODEV,
AUXIO_TYPE_SBUS,
AUXIO_TYPE_EBUS
};
static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
static DEFINE_SPINLOCK(auxio_lock);
static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus)
{
if (auxio_register) {
unsigned long flags;
u8 regval, newval;
spin_lock_irqsave(&auxio_lock, flags);
regval = (ebus ?
(u8) readl(auxio_register) :
sbus_readb(auxio_register));
newval = regval | bits_on;
newval &= ~bits_off;
if (!ebus)
newval &= ~AUXIO_AUX1_MASK;
if (ebus)
writel((u32) newval, auxio_register);
else
sbus_writeb(newval, auxio_register);
spin_unlock_irqrestore(&auxio_lock, flags);
}
}
static void __auxio_set_bit(u8 bit, int on, int ebus)
{
u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
u8 bits_off = 0;
if (!on) {
u8 tmp = bits_off;
bits_off = bits_on;
bits_on = tmp;
}
__auxio_rmw(bits_on, bits_off, ebus);
}
void auxio_set_led(int on)
{
int ebus = auxio_devtype == AUXIO_TYPE_EBUS;
u8 bit;
bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
__auxio_set_bit(bit, on, ebus);
}
static void __auxio_sbus_set_lte(int on)
{
__auxio_set_bit(AUXIO_AUX1_LTE, on, 0);
}
void auxio_set_lte(int on)
{
switch(auxio_devtype) {
case AUXIO_TYPE_SBUS:
__auxio_sbus_set_lte(on);
break;
case AUXIO_TYPE_EBUS:
/* FALL-THROUGH */
default:
break;
}
}
static struct of_device_id __initdata auxio_match[] = {
{
.name = "auxio",
},
{},
};
MODULE_DEVICE_TABLE(of, auxio_match);
static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
{
struct device_node *dp = dev->node;
unsigned long size;
if (!strcmp(dp->parent->name, "ebus")) {
auxio_devtype = AUXIO_TYPE_EBUS;
size = sizeof(u32);
} else if (!strcmp(dp->parent->name, "sbus")) {
auxio_devtype = AUXIO_TYPE_SBUS;
size = 1;
} else {
printk("auxio: Unknown parent bus type [%s]\n",
dp->parent->name);
return -ENODEV;
}
auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
if (!auxio_register)
return -ENODEV;
printk(KERN_INFO "AUXIO: Found device at %s\n",
dp->full_name);
if (auxio_devtype == AUXIO_TYPE_EBUS)
auxio_set_led(AUXIO_LED_ON);
return 0;
}
static struct of_platform_driver auxio_driver = {
.match_table = auxio_match,
.probe = auxio_probe,
.driver = {
.name = "auxio",
},
};
static int __init auxio_init(void)
{
return of_register_driver(&auxio_driver, &of_platform_bus_type);
}
/* Must be after subsys_initcall() so that busses are probed. Must
* be before device_initcall() because things like the floppy driver
* need to use the AUXIO register.
*/
fs_initcall(auxio_init);
|
