1 /*
2  * Generic PowerPC 40x platform support
3  *
4  * Copyright 2008 IBM Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; version 2 of the License.
9  *
10  * This implements simple platform support for PowerPC 44x chips.  This is
11  * mostly used for eval boards or other simple and "generic" 44x boards.  If
12  * your board has custom functions or hardware, then you will likely want to
13  * implement your own board.c file to accommodate it.
14  */
15 
16 #include <asm/machdep.h>
17 #include <asm/pci-bridge.h>
18 #include <asm/ppc4xx.h>
19 #include <asm/prom.h>
20 #include <asm/time.h>
21 #include <asm/udbg.h>
22 #include <asm/uic.h>
23 
24 #include <linux/init.h>
25 #include <linux/of_platform.h>
26 
27 static const struct of_device_id ppc40x_of_bus[] __initconst = {
28 	{ .compatible = "ibm,plb3", },
29 	{ .compatible = "ibm,plb4", },
30 	{ .compatible = "ibm,opb", },
31 	{ .compatible = "ibm,ebc", },
32 	{ .compatible = "simple-bus", },
33 	{},
34 };
35 
36 static int __init ppc40x_device_probe(void)
37 {
38 	of_platform_bus_probe(NULL, ppc40x_of_bus, NULL);
39 
40 	return 0;
41 }
42 machine_device_initcall(ppc40x_simple, ppc40x_device_probe);
43 
44 /* This is the list of boards that can be supported by this simple
45  * platform code.  This does _not_ mean the boards are compatible,
46  * as they most certainly are not from a device tree perspective.
47  * However, their differences are handled by the device tree and the
48  * drivers and therefore they don't need custom board support files.
49  *
50  * Again, if your board needs to do things differently then create a
51  * board.c file for it rather than adding it to this list.
52  */
53 static const char * const board[] __initconst = {
54 	"amcc,acadia",
55 	"amcc,haleakala",
56 	"amcc,kilauea",
57 	"amcc,makalu",
58 	"apm,klondike",
59 	"est,hotfoot",
60 	"plathome,obs600",
61 	NULL
62 };
63 
64 static int __init ppc40x_probe(void)
65 {
66 	if (of_flat_dt_match(of_get_flat_dt_root(), board)) {
67 		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
68 		return 1;
69 	}
70 
71 	return 0;
72 }
73 
74 define_machine(ppc40x_simple) {
75 	.name = "PowerPC 40x Platform",
76 	.probe = ppc40x_probe,
77 	.progress = udbg_progress,
78 	.init_IRQ = uic_init_tree,
79 	.get_irq = uic_get_irq,
80 	.restart = ppc4xx_reset_system,
81 	.calibrate_decr = generic_calibrate_decr,
82 };
83