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1.1 root 1: /*
2: * MCA bus driver code
3: *
4: * Abstracted from 3c509.c.
5: *
6: */
7:
8: FILE_LICENCE ( BSD2 );
9:
10: #include <stdint.h>
11: #include <string.h>
12: #include <stdlib.h>
13: #include <stdio.h>
14: #include <errno.h>
15: #include <ipxe/io.h>
16: #include <ipxe/mca.h>
17:
18: static void mcabus_remove ( struct root_device *rootdev );
19:
20: /**
21: * Probe an MCA device
22: *
23: * @v mca MCA device
24: * @ret rc Return status code
25: *
26: * Searches for a driver for the MCA device. If a driver is found,
27: * its probe() routine is called.
28: */
29: static int mca_probe ( struct mca_device *mca ) {
30: struct mca_driver *driver;
31: struct mca_device_id *id;
32: unsigned int i;
33: int rc;
34:
35: DBG ( "Adding MCA slot %02x (ID %04x POS "
36: "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x)\n",
37: mca->slot, MCA_ID ( mca ),
38: mca->pos[0], mca->pos[1], mca->pos[2], mca->pos[3],
39: mca->pos[4], mca->pos[5], mca->pos[6], mca->pos[7] );
40:
41: for_each_table_entry ( driver, MCA_DRIVERS ) {
42: for ( i = 0 ; i < driver->id_count ; i++ ) {
43: id = &driver->ids[i];
44: if ( id->id != MCA_ID ( mca ) )
45: continue;
46: mca->driver = driver;
47: mca->dev.driver_name = id->name;
48: DBG ( "...using driver %s\n", mca->dev.driver_name );
49: if ( ( rc = driver->probe ( mca, id ) ) != 0 ) {
50: DBG ( "......probe failed\n" );
51: continue;
52: }
53: return 0;
54: }
55: }
56:
57: DBG ( "...no driver found\n" );
58: return -ENOTTY;
59: }
60:
61: /**
62: * Remove an MCA device
63: *
64: * @v mca MCA device
65: */
66: static void mca_remove ( struct mca_device *mca ) {
67: mca->driver->remove ( mca );
68: DBG ( "Removed MCA device %02x\n", mca->slot );
69: }
70:
71: /**
72: * Probe MCA root bus
73: *
74: * @v rootdev MCA bus root device
75: *
76: * Scans the MCA bus for devices and registers all devices it can
77: * find.
78: */
79: static int mcabus_probe ( struct root_device *rootdev ) {
80: struct mca_device *mca = NULL;
81: unsigned int slot;
82: int seen_non_ff;
83: unsigned int i;
84: int rc;
85:
86: for ( slot = 0 ; slot <= MCA_MAX_SLOT_NR ; slot++ ) {
87: /* Allocate struct mca_device */
88: if ( ! mca )
89: mca = malloc ( sizeof ( *mca ) );
90: if ( ! mca ) {
91: rc = -ENOMEM;
92: goto err;
93: }
94: memset ( mca, 0, sizeof ( *mca ) );
95: mca->slot = slot;
96:
97: /* Make sure motherboard setup is off */
98: outb_p ( 0xff, MCA_MOTHERBOARD_SETUP_REG );
99:
100: /* Select the slot */
101: outb_p ( 0x8 | ( mca->slot & 0xf ), MCA_ADAPTER_SETUP_REG );
102:
103: /* Read the POS registers */
104: seen_non_ff = 0;
105: for ( i = 0 ; i < ( sizeof ( mca->pos ) /
106: sizeof ( mca->pos[0] ) ) ; i++ ) {
107: mca->pos[i] = inb_p ( MCA_POS_REG ( i ) );
108: if ( mca->pos[i] != 0xff )
109: seen_non_ff = 1;
110: }
111:
112: /* Kill all setup modes */
113: outb_p ( 0, MCA_ADAPTER_SETUP_REG );
114:
115: /* If all POS registers are 0xff, this means there's no device
116: * present
117: */
118: if ( ! seen_non_ff )
119: continue;
120:
121: /* Add to device hierarchy */
122: snprintf ( mca->dev.name, sizeof ( mca->dev.name ),
123: "MCA%02x", slot );
124: mca->dev.desc.bus_type = BUS_TYPE_MCA;
125: mca->dev.desc.vendor = GENERIC_MCA_VENDOR;
126: mca->dev.desc.device = MCA_ID ( mca );
127: mca->dev.parent = &rootdev->dev;
128: list_add ( &mca->dev.siblings, &rootdev->dev.children );
129: INIT_LIST_HEAD ( &mca->dev.children );
130:
131: /* Look for a driver */
132: if ( mca_probe ( mca ) == 0 ) {
133: /* mcadev registered, we can drop our ref */
134: mca = NULL;
135: } else {
136: /* Not registered; re-use struct */
137: list_del ( &mca->dev.siblings );
138: }
139: }
140:
141: free ( mca );
142: return 0;
143:
144: err:
145: free ( mca );
146: mcabus_remove ( rootdev );
147: return rc;
148: }
149:
150: /**
151: * Remove MCA root bus
152: *
153: * @v rootdev MCA bus root device
154: */
155: static void mcabus_remove ( struct root_device *rootdev ) {
156: struct mca_device *mca;
157: struct mca_device *tmp;
158:
159: list_for_each_entry_safe ( mca, tmp, &rootdev->dev.children,
160: dev.siblings ) {
161: mca_remove ( mca );
162: list_del ( &mca->dev.siblings );
163: free ( mca );
164: }
165: }
166:
167: /** MCA bus root device driver */
168: static struct root_driver mca_root_driver = {
169: .probe = mcabus_probe,
170: .remove = mcabus_remove,
171: };
172:
173: /** MCA bus root device */
174: struct root_device mca_root_device __root_device = {
175: .dev = { .name = "MCA" },
176: .driver = &mca_root_driver,
177: };
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