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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/kernel.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010011#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/eisa.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/init.h>
16
17#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
18#define EISA_FORCE_PROBE_DEFAULT 1
19#else
20#define EISA_FORCE_PROBE_DEFAULT 0
21#endif
22
23static int force_probe = EISA_FORCE_PROBE_DEFAULT;
24static void virtual_eisa_release (struct device *);
25
26/* The default EISA device parent (virtual root device).
27 * Now use a platform device, since that's the obvious choice. */
28
29static struct platform_device eisa_root_dev = {
30 .name = "eisa",
31 .id = 0,
32 .dev = {
33 .release = virtual_eisa_release,
34 },
35};
36
37static struct eisa_root_device eisa_bus_root = {
38 .dev = &eisa_root_dev.dev,
39 .bus_base_addr = 0,
40 .res = &ioport_resource,
41 .slots = EISA_MAX_SLOTS,
42 .dma_mask = 0xffffffff,
43};
44
45static void virtual_eisa_release (struct device *dev)
46{
47 /* nothing really to do here */
48}
49
Andrew Morton4a1ccb52007-05-08 00:26:02 -070050static int __init virtual_eisa_root_init (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
52 int r;
53
54 if ((r = platform_device_register (&eisa_root_dev))) {
55 return r;
56 }
57
58 eisa_bus_root.force_probe = force_probe;
59
60 eisa_root_dev.dev.driver_data = &eisa_bus_root;
61
62 if (eisa_root_register (&eisa_bus_root)) {
63 /* A real bridge may have been registered before
64 * us. So quietly unregister. */
65 platform_device_unregister (&eisa_root_dev);
66 return -1;
67 }
68
69 return 0;
70}
71
72module_param (force_probe, int, 0444);
73
74device_initcall (virtual_eisa_root_init);