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
|
/* linux/arch/i386/kernel/scx200.c
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
National Semiconductor SCx200 support. */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/scx200.h>
#include <linux/scx200_gpio.h>
/* Verify that the configuration block really is there */
#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
#define NAME "scx200"
MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
MODULE_DESCRIPTION("NatSemi SCx200 Driver");
MODULE_LICENSE("GPL");
unsigned scx200_gpio_base = 0;
long scx200_gpio_shadow[2];
unsigned scx200_cb_base = 0;
static struct pci_device_id scx200_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
{ },
};
MODULE_DEVICE_TABLE(pci,scx200_tbl);
static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
static struct pci_driver scx200_pci_driver = {
.name = "scx200",
.id_table = scx200_tbl,
.probe = scx200_probe,
};
static DEFINE_SPINLOCK(scx200_gpio_config_lock);
static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int bank;
unsigned base;
if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
base = pci_resource_start(pdev, 0);
printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
return -EBUSY;
}
scx200_gpio_base = base;
/* read the current values driven on the GPIO signals */
for (bank = 0; bank < 2; ++bank)
scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
} else {
/* find the base of the Configuration Block */
if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
scx200_cb_base = SCx200_CB_BASE_FIXED;
} else {
pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
if (scx200_cb_probe(base)) {
scx200_cb_base = base;
} else {
printk(KERN_WARNING NAME ": Configuration Block not found\n");
return -ENODEV;
}
}
printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
}
return 0;
}
u32 scx200_gpio_configure(int index, u32 mask, u32 bits)
{
u32 config, new_config;
unsigned long flags;
spin_lock_irqsave(&scx200_gpio_config_lock, flags);
outl(index, scx200_gpio_base + 0x20);
config = inl(scx200_gpio_base + 0x24);
new_config = (config & mask) | bits;
outl(new_config, scx200_gpio_base + 0x24);
spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);
return config;
}
#if 0
void scx200_gpio_dump(unsigned index)
{
u32 config = scx200_gpio_configure(index, ~0, 0);
printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config);
if (config & 1)
printk(" OE"); /* output enabled */
else
printk(" TS"); /* tristate */
if (config & 2)
printk(" PP"); /* push pull */
else
printk(" OD"); /* open drain */
if (config & 4)
printk(" PUE"); /* pull up enabled */
else
printk(" PUD"); /* pull up disabled */
if (config & 8)
printk(" LOCKED"); /* locked */
if (config & 16)
printk(" LEVEL"); /* level input */
else
printk(" EDGE"); /* edge input */
if (config & 32)
printk(" HI"); /* trigger on rising edge */
else
printk(" LO"); /* trigger on falling edge */
if (config & 64)
printk(" DEBOUNCE"); /* debounce */
printk("\n");
}
#endif /* 0 */
static int __init scx200_init(void)
{
printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
return pci_register_driver(&scx200_pci_driver);
}
static void __exit scx200_cleanup(void)
{
pci_unregister_driver(&scx200_pci_driver);
release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
}
module_init(scx200_init);
module_exit(scx200_cleanup);
EXPORT_SYMBOL(scx200_gpio_base);
EXPORT_SYMBOL(scx200_gpio_shadow);
EXPORT_SYMBOL(scx200_gpio_configure);
EXPORT_SYMBOL(scx200_cb_base);
/*
Local variables:
compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules"
c-basic-offset: 8
End:
*/
|
