Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Virtual EISA root driver. | |
3 | * Acts as a placeholder if we don't have a proper EISA bridge. | |
4 | * | |
5 | * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> | |
6 | * | |
7 | * This code is released under the GPL version 2. | |
8 | */ | |
9 | ||
10 | #include <linux/config.h> | |
11 | #include <linux/kernel.h> | |
d052d1be | 12 | #include <linux/platform_device.h> |
1da177e4 LT |
13 | #include <linux/eisa.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/init.h> | |
17 | ||
18 | #if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING) | |
19 | #define EISA_FORCE_PROBE_DEFAULT 1 | |
20 | #else | |
21 | #define EISA_FORCE_PROBE_DEFAULT 0 | |
22 | #endif | |
23 | ||
24 | static int force_probe = EISA_FORCE_PROBE_DEFAULT; | |
25 | static void virtual_eisa_release (struct device *); | |
26 | ||
27 | /* The default EISA device parent (virtual root device). | |
28 | * Now use a platform device, since that's the obvious choice. */ | |
29 | ||
30 | static struct platform_device eisa_root_dev = { | |
31 | .name = "eisa", | |
32 | .id = 0, | |
33 | .dev = { | |
34 | .release = virtual_eisa_release, | |
35 | }, | |
36 | }; | |
37 | ||
38 | static struct eisa_root_device eisa_bus_root = { | |
39 | .dev = &eisa_root_dev.dev, | |
40 | .bus_base_addr = 0, | |
41 | .res = &ioport_resource, | |
42 | .slots = EISA_MAX_SLOTS, | |
43 | .dma_mask = 0xffffffff, | |
44 | }; | |
45 | ||
46 | static void virtual_eisa_release (struct device *dev) | |
47 | { | |
48 | /* nothing really to do here */ | |
49 | } | |
50 | ||
51 | static int virtual_eisa_root_init (void) | |
52 | { | |
53 | int r; | |
54 | ||
55 | if ((r = platform_device_register (&eisa_root_dev))) { | |
56 | return r; | |
57 | } | |
58 | ||
59 | eisa_bus_root.force_probe = force_probe; | |
60 | ||
61 | eisa_root_dev.dev.driver_data = &eisa_bus_root; | |
62 | ||
63 | if (eisa_root_register (&eisa_bus_root)) { | |
64 | /* A real bridge may have been registered before | |
65 | * us. So quietly unregister. */ | |
66 | platform_device_unregister (&eisa_root_dev); | |
67 | return -1; | |
68 | } | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | module_param (force_probe, int, 0444); | |
74 | ||
75 | device_initcall (virtual_eisa_root_init); |