1 /*
2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 FILE_LICENCE ( GPL2_OR_LATER );
20
21 #include <string.h>
22 #include <gpxe/list.h>
23 #include <gpxe/tables.h>
24 #include <gpxe/device.h>
25 #include <gpxe/init.h>
26
27 /**
28 * @file
29 *
30 * Device model
31 *
32 */
33
34 /** Registered root devices */
35 static LIST_HEAD ( devices );
36
37 /**
38 * Probe a root device
39 *
40 * @v rootdev Root device
41 * @ret rc Return status code
42 */
rootdev_probe(struct root_device * rootdev)43 static int rootdev_probe ( struct root_device *rootdev ) {
44 int rc;
45
46 DBG ( "Adding %s root bus\n", rootdev->dev.name );
47 if ( ( rc = rootdev->driver->probe ( rootdev ) ) != 0 ) {
48 DBG ( "Failed to add %s root bus: %s\n",
49 rootdev->dev.name, strerror ( rc ) );
50 return rc;
51 }
52
53 return 0;
54 }
55
56 /**
57 * Remove a root device
58 *
59 * @v rootdev Root device
60 */
rootdev_remove(struct root_device * rootdev)61 static void rootdev_remove ( struct root_device *rootdev ) {
62 rootdev->driver->remove ( rootdev );
63 DBG ( "Removed %s root bus\n", rootdev->dev.name );
64 }
65
66 /**
67 * Probe all devices
68 *
69 * This initiates probing for all devices in the system. After this
70 * call, the device hierarchy will be populated, and all hardware
71 * should be ready to use.
72 */
probe_devices(void)73 static void probe_devices ( void ) {
74 struct root_device *rootdev;
75 int rc;
76
77 for_each_table_entry ( rootdev, ROOT_DEVICES ) {
78 list_add ( &rootdev->dev.siblings, &devices );
79 INIT_LIST_HEAD ( &rootdev->dev.children );
80 if ( ( rc = rootdev_probe ( rootdev ) ) != 0 )
81 list_del ( &rootdev->dev.siblings );
82 }
83 }
84
85 /**
86 * Remove all devices
87 *
88 */
remove_devices(int flags)89 static void remove_devices ( int flags ) {
90 struct root_device *rootdev;
91 struct root_device *tmp;
92
93 if ( flags & SHUTDOWN_KEEP_DEVICES ) {
94 DBG ( "Refusing to remove devices on shutdown\n" );
95 return;
96 }
97
98 list_for_each_entry_safe ( rootdev, tmp, &devices, dev.siblings ) {
99 rootdev_remove ( rootdev );
100 list_del ( &rootdev->dev.siblings );
101 }
102 }
103
104 struct startup_fn startup_devices __startup_fn ( STARTUP_NORMAL ) = {
105 .startup = probe_devices,
106 .shutdown = remove_devices,
107 };
108