1 | // SPDX-License-Identifier: GPL-2.0-only |
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> |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/platform_device.h> |
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 = { |
37 | .dev = &eisa_root_dev.dev, |
38 | .bus_base_addr = 0, |
39 | .res = &ioport_resource, |
40 | .slots = EISA_MAX_SLOTS, |
41 | .dma_mask = 0xffffffff, |
42 | }; |
43 | |
44 | static void virtual_eisa_release (struct device *dev) |
45 | { |
46 | /* nothing really to do here */ |
47 | } |
48 | |
49 | static int __init virtual_eisa_root_init (void) |
50 | { |
51 | int r; |
52 | |
53 | if ((r = platform_device_register (&eisa_root_dev))) |
54 | return r; |
55 | |
56 | eisa_bus_root.force_probe = force_probe; |
57 | |
58 | dev_set_drvdata(dev: &eisa_root_dev.dev, data: &eisa_bus_root); |
59 | |
60 | if (eisa_root_register (root: &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); |
73 | |