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d1d24ed4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Virtual EISA root driver. | |
4 | * Acts as a placeholder if we don't have a proper EISA bridge. | |
5 | * | |
6 | * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> | |
1da177e4 LT |
7 | */ |
8 | ||
1da177e4 | 9 | #include <linux/kernel.h> |
d052d1be | 10 | #include <linux/platform_device.h> |
1da177e4 LT |
11 | #include <linux/eisa.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/moduleparam.h> | |
14 | #include <linux/init.h> | |
15 | ||
16 | #if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING) | |
17 | #define EISA_FORCE_PROBE_DEFAULT 1 | |
18 | #else | |
19 | #define EISA_FORCE_PROBE_DEFAULT 0 | |
20 | #endif | |
21 | ||
22 | static int force_probe = EISA_FORCE_PROBE_DEFAULT; | |
23 | static void virtual_eisa_release (struct device *); | |
24 | ||
25 | /* The default EISA device parent (virtual root device). | |
26 | * Now use a platform device, since that's the obvious choice. */ | |
27 | ||
28 | static struct platform_device eisa_root_dev = { | |
29 | .name = "eisa", | |
30 | .id = 0, | |
31 | .dev = { | |
32 | .release = virtual_eisa_release, | |
33 | }, | |
34 | }; | |
35 | ||
36 | static struct eisa_root_device eisa_bus_root = { | |
91809d22 LM |
37 | .dev = &eisa_root_dev.dev, |
38 | .bus_base_addr = 0, | |
39 | .res = &ioport_resource, | |
40 | .slots = EISA_MAX_SLOTS, | |
41 | .dma_mask = 0xffffffff, | |
1da177e4 LT |
42 | }; |
43 | ||
44 | static void virtual_eisa_release (struct device *dev) | |
45 | { | |
46 | /* nothing really to do here */ | |
47 | } | |
48 | ||
4a1ccb5b | 49 | static int __init virtual_eisa_root_init (void) |
1da177e4 LT |
50 | { |
51 | int r; | |
91809d22 LM |
52 | |
53 | if ((r = platform_device_register (&eisa_root_dev))) | |
54 | return r; | |
1da177e4 LT |
55 | |
56 | eisa_bus_root.force_probe = force_probe; | |
91809d22 | 57 | |
4b9d0d3b | 58 | dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root); |
1da177e4 LT |
59 | |
60 | if (eisa_root_register (&eisa_bus_root)) { | |
61 | /* A real bridge may have been registered before | |
62 | * us. So quietly unregister. */ | |
63 | platform_device_unregister (&eisa_root_dev); | |
64 | return -1; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | module_param (force_probe, int, 0444); | |
71 | ||
72 | device_initcall (virtual_eisa_root_init); |