1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Generic PowerPC 40x platform support
4  *
5  * Copyright 2008 IBM Corporation
6  *
7  * This implements simple platform support for PowerPC 44x chips.  This is
8  * mostly used for eval boards or other simple and "generic" 44x boards.  If
9  * your board has custom functions or hardware, then you will likely want to
10  * implement your own board.c file to accommodate it.
11  */
12 
13 #include <asm/machdep.h>
14 #include <asm/pci-bridge.h>
15 #include <asm/ppc4xx.h>
16 #include <asm/time.h>
17 #include <asm/udbg.h>
18 #include <asm/uic.h>
19 
20 #include <linux/init.h>
21 #include <linux/of_platform.h>
22 
23 static const struct of_device_id ppc40x_of_bus[] __initconst = {
24 	{ .compatible = "ibm,plb3", },
25 	{ .compatible = "ibm,plb4", },
26 	{ .compatible = "ibm,opb", },
27 	{ .compatible = "ibm,ebc", },
28 	{ .compatible = "simple-bus", },
29 	{},
30 };
31 
32 static int __init ppc40x_device_probe(void)
33 {
34 	of_platform_bus_probe(NULL, ppc40x_of_bus, NULL);
35 
36 	return 0;
37 }
38 machine_device_initcall(ppc40x_simple, ppc40x_device_probe);
39 
40 /* This is the list of boards that can be supported by this simple
41  * platform code.  This does _not_ mean the boards are compatible,
42  * as they most certainly are not from a device tree perspective.
43  * However, their differences are handled by the device tree and the
44  * drivers and therefore they don't need custom board support files.
45  *
46  * Again, if your board needs to do things differently then create a
47  * board.c file for it rather than adding it to this list.
48  */
49 static const char * const board[] __initconst = {
50 	"amcc,acadia",
51 	"amcc,haleakala",
52 	"amcc,kilauea",
53 	"amcc,makalu",
54 	"apm,klondike",
55 	"est,hotfoot",
56 	"plathome,obs600",
57 	NULL
58 };
59 
60 static int __init ppc40x_probe(void)
61 {
62 	if (of_device_compatible_match(of_root, board)) {
63 		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
64 		return 1;
65 	}
66 
67 	return 0;
68 }
69 
70 define_machine(ppc40x_simple) {
71 	.name = "PowerPC 40x Platform",
72 	.probe = ppc40x_probe,
73 	.progress = udbg_progress,
74 	.init_IRQ = uic_init_tree,
75 	.get_irq = uic_get_irq,
76 	.restart = ppc4xx_reset_system,
77 	.calibrate_decr = generic_calibrate_decr,
78 };
79