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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 <gpxe/io.h>
16 #include <gpxe/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  */
mca_probe(struct mca_device * mca)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->driver_name = id->name;
48 			DBG ( "...using driver %s\n", mca->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  */
mca_remove(struct mca_device * mca)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  */
mcabus_probe(struct root_device * rootdev)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  */
mcabus_remove(struct root_device * rootdev)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 };
178