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
|
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <gpxe/io.h>
#include <unistd.h>
#include <gpxe/eisa.h>
FILE_LICENCE ( GPL2_OR_LATER );
static void eisabus_remove ( struct root_device *rootdev );
/**
* Reset and enable/disable an EISA device
*
* @v eisa EISA device
* @v enabled 1=enable, 0=disable
*/
void eisa_device_enabled ( struct eisa_device *eisa, int enabled ) {
/* Set reset line high for 1000 µs. Spec says 500 µs, but
* this doesn't work for all cards, so we are conservative.
*/
outb ( EISA_CMD_RESET, eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
/* Set reset low and write a 1 to ENABLE. Delay again, in
* case the card takes a while to wake up.
*/
outb ( enabled ? EISA_CMD_ENABLE : 0,
eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
DBG ( "EISA %s device %02x\n", ( enabled ? "enabled" : "disabled" ),
eisa->slot );
}
/**
* Probe an EISA device
*
* @v eisa EISA device
* @ret rc Return status code
*
* Searches for a driver for the EISA device. If a driver is found,
* its probe() routine is called.
*/
static int eisa_probe ( struct eisa_device *eisa ) {
struct eisa_driver *driver;
struct eisa_device_id *id;
unsigned int i;
int rc;
DBG ( "Adding EISA device %02x (%04x:%04x (\"%s\") io %x)\n",
eisa->slot, eisa->vendor_id, eisa->prod_id,
isa_id_string ( eisa->vendor_id, eisa->prod_id ), eisa->ioaddr );
for_each_table_entry ( driver, EISA_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
id = &driver->ids[i];
if ( id->vendor_id != eisa->vendor_id )
continue;
if ( ISA_PROD_ID ( id->prod_id ) !=
ISA_PROD_ID ( eisa->prod_id ) )
continue;
eisa->driver = driver;
eisa->driver_name = id->name;
DBG ( "...using driver %s\n", eisa->driver_name );
if ( ( rc = driver->probe ( eisa, id ) ) != 0 ) {
DBG ( "......probe failed\n" );
continue;
}
return 0;
}
}
DBG ( "...no driver found\n" );
return -ENOTTY;
}
/**
* Remove an EISA device
*
* @v eisa EISA device
*/
static void eisa_remove ( struct eisa_device *eisa ) {
eisa->driver->remove ( eisa );
DBG ( "Removed EISA device %02x\n", eisa->slot );
}
/**
* Probe EISA root bus
*
* @v rootdev EISA bus root device
*
* Scans the EISA bus for devices and registers all devices it can
* find.
*/
static int eisabus_probe ( struct root_device *rootdev ) {
struct eisa_device *eisa = NULL;
unsigned int slot;
int rc;
for ( slot = EISA_MIN_SLOT ; slot <= EISA_MAX_SLOT ; slot++ ) {
/* Allocate struct eisa_device */
if ( ! eisa )
eisa = malloc ( sizeof ( *eisa ) );
if ( ! eisa ) {
rc = -ENOMEM;
goto err;
}
memset ( eisa, 0, sizeof ( *eisa ) );
eisa->slot = slot;
eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );
/* Test for board present */
outb ( 0xff, eisa->ioaddr + EISA_VENDOR_ID );
eisa->vendor_id =
le16_to_cpu ( inw ( eisa->ioaddr + EISA_VENDOR_ID ) );
eisa->prod_id =
le16_to_cpu ( inw ( eisa->ioaddr + EISA_PROD_ID ) );
if ( eisa->vendor_id & 0x80 ) {
/* No board present */
continue;
}
/* Add to device hierarchy */
snprintf ( eisa->dev.name, sizeof ( eisa->dev.name ),
"EISA%02x", slot );
eisa->dev.desc.bus_type = BUS_TYPE_EISA;
eisa->dev.desc.vendor = eisa->vendor_id;
eisa->dev.desc.device = eisa->prod_id;
eisa->dev.parent = &rootdev->dev;
list_add ( &eisa->dev.siblings, &rootdev->dev.children );
INIT_LIST_HEAD ( &eisa->dev.children );
/* Look for a driver */
if ( eisa_probe ( eisa ) == 0 ) {
/* eisadev registered, we can drop our ref */
eisa = NULL;
} else {
/* Not registered; re-use struct */
list_del ( &eisa->dev.siblings );
}
}
free ( eisa );
return 0;
err:
free ( eisa );
eisabus_remove ( rootdev );
return rc;
}
/**
* Remove EISA root bus
*
* @v rootdev EISA bus root device
*/
static void eisabus_remove ( struct root_device *rootdev ) {
struct eisa_device *eisa;
struct eisa_device *tmp;
list_for_each_entry_safe ( eisa, tmp, &rootdev->dev.children,
dev.siblings ) {
eisa_remove ( eisa );
list_del ( &eisa->dev.siblings );
free ( eisa );
}
}
/** EISA bus root device driver */
static struct root_driver eisa_root_driver = {
.probe = eisabus_probe,
.remove = eisabus_remove,
};
/** EISA bus root device */
struct root_device eisa_root_device __root_device = {
.dev = { .name = "EISA" },
.driver = &eisa_root_driver,
};
|
