virtual_root.c
1.7 KB
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/*
* Virtual EISA root driver.
* Acts as a placeholder if we don't have a proper EISA bridge.
*
* (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
*
* This code is released under the GPL version 2.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/eisa.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
#define EISA_FORCE_PROBE_DEFAULT 1
#else
#define EISA_FORCE_PROBE_DEFAULT 0
#endif
static int force_probe = EISA_FORCE_PROBE_DEFAULT;
static void virtual_eisa_release (struct device *);
/* The default EISA device parent (virtual root device).
* Now use a platform device, since that's the obvious choice. */
static struct platform_device eisa_root_dev = {
.name = "eisa",
.id = 0,
.dev = {
.release = virtual_eisa_release,
},
};
static struct eisa_root_device eisa_bus_root = {
.dev = &eisa_root_dev.dev,
.bus_base_addr = 0,
.res = &ioport_resource,
.slots = EISA_MAX_SLOTS,
.dma_mask = 0xffffffff,
};
static void virtual_eisa_release (struct device *dev)
{
/* nothing really to do here */
}
static int __init virtual_eisa_root_init (void)
{
int r;
if ((r = platform_device_register (&eisa_root_dev))) {
return r;
}
eisa_bus_root.force_probe = force_probe;
dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
if (eisa_root_register (&eisa_bus_root)) {
/* A real bridge may have been registered before
* us. So quietly unregister. */
platform_device_unregister (&eisa_root_dev);
return -1;
}
return 0;
}
module_param (force_probe, int, 0444);
device_initcall (virtual_eisa_root_init);