1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Generic PowerPC 44x 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 ppc44x_of_bus[] __initconst = {
25 	{ .compatible = "ibm,plb4", },
26 	{ .compatible = "ibm,opb", },
27 	{ .compatible = "ibm,ebc", },
28 	{ .compatible = "simple-bus", },
29 	{},
30 };
31 
ppc44x_device_probe(void)32 static int __init ppc44x_device_probe(void)
33 {
34 	of_platform_bus_probe(NULL, ppc44x_of_bus, NULL);
35 
36 	return 0;
37 }
38 machine_device_initcall(ppc44x_simple, ppc44x_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 char *board[] __initdata = {
50 	"amcc,arches",
51 	"amcc,bamboo",
52 	"apm,bluestone",
53 	"amcc,glacier",
54 	"ibm,ebony",
55 	"amcc,eiger",
56 	"amcc,katmai",
57 	"amcc,rainier",
58 	"amcc,redwood",
59 	"amcc,sequoia",
60 	"amcc,taishan",
61 	"amcc,yosemite",
62 	"mosaixtech,icon"
63 };
64 
ppc44x_probe(void)65 static int __init ppc44x_probe(void)
66 {
67 	int i = 0;
68 
69 	for (i = 0; i < ARRAY_SIZE(board); i++) {
70 		if (of_machine_is_compatible(board[i])) {
71 			pci_set_flags(PCI_REASSIGN_ALL_RSRC);
72 			return 1;
73 		}
74 	}
75 
76 	return 0;
77 }
78 
define_machine(ppc44x_simple)79 define_machine(ppc44x_simple) {
80 	.name = "PowerPC 44x Platform",
81 	.probe = ppc44x_probe,
82 	.progress = udbg_progress,
83 	.init_IRQ = uic_init_tree,
84 	.get_irq = uic_get_irq,
85 	.restart = ppc4xx_reset_system,
86 	.calibrate_decr = generic_calibrate_decr,
87 };
88