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
ppc40x_device_probe(void)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
ppc40x_probe(void)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
define_machine(ppc40x_simple)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