[efi] Implement the EFI_PXE_BASE_CODE_PROTOCOL
[ipxe.git] / src / drivers / bus / eisa.c
1 #include <stdint.h>
2 #include <string.h>
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <errno.h>
6 #include <ipxe/io.h>
7 #include <unistd.h>
8 #include <ipxe/eisa.h>
9
10 FILE_LICENCE ( GPL2_OR_LATER );
11
12 static void eisabus_remove ( struct root_device *rootdev );
13
14 /**
15 * Reset and enable/disable an EISA device
16 *
17 * @v eisa EISA device
18 * @v enabled 1=enable, 0=disable
19 */
20 void eisa_device_enabled ( struct eisa_device *eisa, int enabled ) {
21 /* Set reset line high for 1000 µs. Spec says 500 µs, but
22 * this doesn't work for all cards, so we are conservative.
23 */
24 outb ( EISA_CMD_RESET, eisa->ioaddr + EISA_GLOBAL_CONFIG );
25 udelay ( 1000 ); /* Must wait 800 */
26
27 /* Set reset low and write a 1 to ENABLE. Delay again, in
28 * case the card takes a while to wake up.
29 */
30 outb ( enabled ? EISA_CMD_ENABLE : 0,
31 eisa->ioaddr + EISA_GLOBAL_CONFIG );
32 udelay ( 1000 ); /* Must wait 800 */
33
34 DBG ( "EISA %s device %02x\n", ( enabled ? "enabled" : "disabled" ),
35 eisa->slot );
36 }
37
38 /**
39 * Probe an EISA device
40 *
41 * @v eisa EISA device
42 * @ret rc Return status code
43 *
44 * Searches for a driver for the EISA device. If a driver is found,
45 * its probe() routine is called.
46 */
47 static int eisa_probe ( struct eisa_device *eisa ) {
48 struct eisa_driver *driver;
49 struct eisa_device_id *id;
50 unsigned int i;
51 int rc;
52
53 DBG ( "Adding EISA device %02x (%04x:%04x (\"%s\") io %x)\n",
54 eisa->slot, eisa->vendor_id, eisa->prod_id,
55 isa_id_string ( eisa->vendor_id, eisa->prod_id ), eisa->ioaddr );
56
57 for_each_table_entry ( driver, EISA_DRIVERS ) {
58 for ( i = 0 ; i < driver->id_count ; i++ ) {
59 id = &driver->ids[i];
60 if ( id->vendor_id != eisa->vendor_id )
61 continue;
62 if ( ISA_PROD_ID ( id->prod_id ) !=
63 ISA_PROD_ID ( eisa->prod_id ) )
64 continue;
65 eisa->driver = driver;
66 eisa->dev.driver_name = id->name;
67 DBG ( "...using driver %s\n", eisa->dev.driver_name );
68 if ( ( rc = driver->probe ( eisa, id ) ) != 0 ) {
69 DBG ( "......probe failed\n" );
70 continue;
71 }
72 return 0;
73 }
74 }
75
76 DBG ( "...no driver found\n" );
77 return -ENOTTY;
78 }
79
80 /**
81 * Remove an EISA device
82 *
83 * @v eisa EISA device
84 */
85 static void eisa_remove ( struct eisa_device *eisa ) {
86 eisa->driver->remove ( eisa );
87 DBG ( "Removed EISA device %02x\n", eisa->slot );
88 }
89
90 /**
91 * Probe EISA root bus
92 *
93 * @v rootdev EISA bus root device
94 *
95 * Scans the EISA bus for devices and registers all devices it can
96 * find.
97 */
98 static int eisabus_probe ( struct root_device *rootdev ) {
99 struct eisa_device *eisa = NULL;
100 unsigned int slot;
101 int rc;
102
103 for ( slot = EISA_MIN_SLOT ; slot <= EISA_MAX_SLOT ; slot++ ) {
104 /* Allocate struct eisa_device */
105 if ( ! eisa )
106 eisa = malloc ( sizeof ( *eisa ) );
107 if ( ! eisa ) {
108 rc = -ENOMEM;
109 goto err;
110 }
111 memset ( eisa, 0, sizeof ( *eisa ) );
112 eisa->slot = slot;
113 eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );
114
115 /* Test for board present */
116 outb ( 0xff, eisa->ioaddr + EISA_VENDOR_ID );
117 eisa->vendor_id =
118 le16_to_cpu ( inw ( eisa->ioaddr + EISA_VENDOR_ID ) );
119 eisa->prod_id =
120 le16_to_cpu ( inw ( eisa->ioaddr + EISA_PROD_ID ) );
121 if ( eisa->vendor_id & 0x80 ) {
122 /* No board present */
123 continue;
124 }
125
126 /* Add to device hierarchy */
127 snprintf ( eisa->dev.name, sizeof ( eisa->dev.name ),
128 "EISA%02x", slot );
129 eisa->dev.desc.bus_type = BUS_TYPE_EISA;
130 eisa->dev.desc.vendor = eisa->vendor_id;
131 eisa->dev.desc.device = eisa->prod_id;
132 eisa->dev.parent = &rootdev->dev;
133 list_add ( &eisa->dev.siblings, &rootdev->dev.children );
134 INIT_LIST_HEAD ( &eisa->dev.children );
135
136 /* Look for a driver */
137 if ( eisa_probe ( eisa ) == 0 ) {
138 /* eisadev registered, we can drop our ref */
139 eisa = NULL;
140 } else {
141 /* Not registered; re-use struct */
142 list_del ( &eisa->dev.siblings );
143 }
144 }
145
146 free ( eisa );
147 return 0;
148
149 err:
150 free ( eisa );
151 eisabus_remove ( rootdev );
152 return rc;
153 }
154
155 /**
156 * Remove EISA root bus
157 *
158 * @v rootdev EISA bus root device
159 */
160 static void eisabus_remove ( struct root_device *rootdev ) {
161 struct eisa_device *eisa;
162 struct eisa_device *tmp;
163
164 list_for_each_entry_safe ( eisa, tmp, &rootdev->dev.children,
165 dev.siblings ) {
166 eisa_remove ( eisa );
167 list_del ( &eisa->dev.siblings );
168 free ( eisa );
169 }
170 }
171
172 /** EISA bus root device driver */
173 static struct root_driver eisa_root_driver = {
174 .probe = eisabus_probe,
175 .remove = eisabus_remove,
176 };
177
178 /** EISA bus root device */
179 struct root_device eisa_root_device __root_device = {
180 .dev = { .name = "EISA" },
181 .driver = &eisa_root_driver,
182 };