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/prom.h>
17 #include <asm/time.h>
18 #include <asm/udbg.h>
19 #include <asm/uic.h>
20 
21 #include <linux/init.h>
22 #include <linux/of_platform.h>
23 
24 static const struct of_device_id ppc40x_of_bus[] __initconst = {
25 	{ .compatible = "ibm,plb3", },
26 	{ .compatible = "ibm,plb4", },
27 	{ .compatible = "ibm,opb", },
28 	{ .compatible = "ibm,ebc", },
29 	{ .compatible = "simple-bus", },
30 	{},
31 };
32 
33 static int __init ppc40x_device_probe(void)
34 {
35 	of_platform_bus_probe(NULL, ppc40x_of_bus, NULL);
36 
37 	return 0;
38 }
39 machine_device_initcall(ppc40x_simple, ppc40x_device_probe);
40 
41 /* This is the list of boards that can be supported by this simple
42  * platform code.  This does _not_ mean the boards are compatible,
43  * as they most certainly are not from a device tree perspective.
44  * However, their differences are handled by the device tree and the
45  * drivers and therefore they don't need custom board support files.
46  *
47  * Again, if your board needs to do things differently then create a
48  * board.c file for it rather than adding it to this list.
49  */
50 static const char * const board[] __initconst = {
51 	"amcc,acadia",
52 	"amcc,haleakala",
53 	"amcc,kilauea",
54 	"amcc,makalu",
55 	"apm,klondike",
56 	"est,hotfoot",
57 	"plathome,obs600",
58 	NULL
59 };
60 
61 static int __init ppc40x_probe(void)
62 {
63 	if (of_device_compatible_match(of_root, board)) {
64 		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
65 		return 1;
66 	}
67 
68 	return 0;
69 }
70 
71 define_machine(ppc40x_simple) {
72 	.name = "PowerPC 40x Platform",
73 	.probe = ppc40x_probe,
74 	.progress = udbg_progress,
75 	.init_IRQ = uic_init_tree,
76 	.get_irq = uic_get_irq,
77 	.restart = ppc4xx_reset_system,
78 	.calibrate_decr = generic_calibrate_decr,
79 };
80