2 * Virtual EISA root driver.
3 * Acts as a placeholder if we don't have a proper EISA bridge.
5 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
7 * This code is released under the GPL version 2.
10 #include <linux/config.h>
11 #include <linux/kernel.h>
12 #include <linux/device.h>
13 #include <linux/eisa.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
18 #if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
19 #define EISA_FORCE_PROBE_DEFAULT 1
21 #define EISA_FORCE_PROBE_DEFAULT 0
24 static int force_probe = EISA_FORCE_PROBE_DEFAULT;
25 static void virtual_eisa_release (struct device *);
27 /* The default EISA device parent (virtual root device).
28 * Now use a platform device, since that's the obvious choice. */
30 static struct platform_device eisa_root_dev = {
34 .release = virtual_eisa_release,
38 static struct eisa_root_device eisa_bus_root = {
39 .dev = &eisa_root_dev.dev,
41 .res = &ioport_resource,
42 .slots = EISA_MAX_SLOTS,
43 .dma_mask = 0xffffffff,
46 static void virtual_eisa_release (struct device *dev)
48 /* nothing really to do here */
51 static int virtual_eisa_root_init (void)
55 if ((r = platform_device_register (&eisa_root_dev))) {
59 eisa_bus_root.force_probe = force_probe;
61 eisa_root_dev.dev.driver_data = &eisa_bus_root;
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);
73 module_param (force_probe, int, 0444);
75 device_initcall (virtual_eisa_root_init);