1 /*
2  * Generic PowerPC 44x 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 __initdata struct of_device_id ppc44x_of_bus[] = {
28 	{ .compatible = "ibm,plb4", },
29 	{ .compatible = "ibm,opb", },
30 	{ .compatible = "ibm,ebc", },
31 	{ .compatible = "simple-bus", },
32 	{},
33 };
34 
35 static int __init ppc44x_device_probe(void)
36 {
37 	of_platform_bus_probe(NULL, ppc44x_of_bus, NULL);
38 
39 	return 0;
40 }
41 machine_device_initcall(ppc44x_simple, ppc44x_device_probe);
42 
43 /* This is the list of boards that can be supported by this simple
44  * platform code.  This does _not_ mean the boards are compatible,
45  * as they most certainly are not from a device tree perspective.
46  * However, their differences are handled by the device tree and the
47  * drivers and therefore they don't need custom board support files.
48  *
49  * Again, if your board needs to do things differently then create a
50  * board.c file for it rather than adding it to this list.
51  */
52 static char *board[] __initdata = {
53 	"amcc,arches",
54 	"amcc,bamboo",
55 	"amcc,canyonlands",
56 	"amcc,glacier",
57 	"ibm,ebony",
58 	"amcc,katmai",
59 	"amcc,rainier",
60 	"amcc,sequoia",
61 	"amcc,taishan",
62 	"amcc,yosemite"
63 };
64 
65 static int __init ppc44x_probe(void)
66 {
67 	unsigned long root = of_get_flat_dt_root();
68 	int i = 0;
69 
70 	for (i = 0; i < ARRAY_SIZE(board); i++) {
71 		if (of_flat_dt_is_compatible(root, board[i])) {
72 			ppc_pci_flags = PPC_PCI_REASSIGN_ALL_RSRC;
73 			return 1;
74 		}
75 	}
76 
77 	return 0;
78 }
79 
80 define_machine(ppc44x_simple) {
81 	.name = "PowerPC 44x Platform",
82 	.probe = ppc44x_probe,
83 	.progress = udbg_progress,
84 	.init_IRQ = uic_init_tree,
85 	.get_irq = uic_get_irq,
86 	.restart = ppc4xx_reset_system,
87 	.calibrate_decr = generic_calibrate_decr,
88 };
89