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  * modified for SNI usage by Thomas Bogendoerfer
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/eisa.h>
13 #include <linux/init.h>
14 
15 /* The default EISA device parent (virtual root device).
16  * Now use a platform device, since that's the obvious choice. */
17 
18 static struct platform_device eisa_root_dev = {
19 	.name = "eisa",
20 	.id   = 0,
21 };
22 
23 static struct eisa_root_device eisa_bus_root = {
24 	.dev	       = &eisa_root_dev.dev,
25 	.bus_base_addr = 0,
26 	.res	       = &ioport_resource,
27 	.slots	       = EISA_MAX_SLOTS,
28 	.dma_mask      = 0xffffffff,
29 	.force_probe   = 1,
30 };
31 
sni_eisa_root_init(void)32 int __init sni_eisa_root_init(void)
33 {
34 	int r;
35 
36 	r = platform_device_register(&eisa_root_dev);
37 	if (!r)
38 		return r;
39 
40 	dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
41 
42 	if (eisa_root_register(&eisa_bus_root)) {
43 		/* A real bridge may have been registered before
44 		 * us. So quietly unregister. */
45 		platform_device_unregister(&eisa_root_dev);
46 		return -1;
47 	}
48 	return 0;
49 }
50