1 /*
2  * Support for 'mpc5200-simple-platform' compatible boards.
3  *
4  * Written by Marian Balakowicz <m8@semihalf.com>
5  * Copyright (C) 2007 Semihalf
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  *
12  * Description:
13  * This code implements support for a simple MPC52xx based boards which
14  * do not need a custom platform specific setup. Such boards are
15  * supported assuming the following:
16  *
17  * - GPIO pins are configured by the firmware,
18  * - CDM configuration (clocking) is setup correctly by firmware,
19  * - if the 'fsl,has-wdt' property is present in one of the
20  *   gpt nodes, then it is safe to use such gpt to reset the board,
21  * - PCI is supported if enabled in the kernel configuration
22  *   and if there is a PCI bus node defined in the device tree.
23  *
24  * Boards that are compatible with this generic platform support
25  * are listed in a 'board' table.
26  */
27 
28 #undef DEBUG
29 #include <asm/time.h>
30 #include <asm/prom.h>
31 #include <asm/machdep.h>
32 #include <asm/mpc52xx.h>
33 
34 /*
35  * Setup the architecture
36  */
37 static void __init mpc5200_simple_setup_arch(void)
38 {
39 	if (ppc_md.progress)
40 		ppc_md.progress("mpc5200_simple_setup_arch()", 0);
41 
42 	/* Map important registers from the internal memory map */
43 	mpc52xx_map_common_devices();
44 
45 	/* Some mpc5200 & mpc5200b related configuration */
46 	mpc5200_setup_xlb_arbiter();
47 
48 	mpc52xx_setup_pci();
49 }
50 
51 /* list of the supported boards */
52 static char *board[] __initdata = {
53 	"promess,motionpro",
54 	"phytec,pcm030",
55 	"schindler,cm5200",
56 	"tqc,tqm5200",
57 	NULL
58 };
59 
60 /*
61  * Called very early, MMU is off, device-tree isn't unflattened
62  */
63 static int __init mpc5200_simple_probe(void)
64 {
65 	unsigned long node = of_get_flat_dt_root();
66 	int i = 0;
67 
68 	while (board[i]) {
69 		if (of_flat_dt_is_compatible(node, board[i]))
70 			break;
71 		i++;
72 	}
73 
74 	return (board[i] != NULL);
75 }
76 
77 define_machine(mpc5200_simple_platform) {
78 	.name		= "mpc5200-simple-platform",
79 	.probe		= mpc5200_simple_probe,
80 	.setup_arch	= mpc5200_simple_setup_arch,
81 	.init		= mpc52xx_declare_of_platform_devices,
82 	.init_IRQ	= mpc52xx_init_irq,
83 	.get_irq	= mpc52xx_get_irq,
84 	.restart	= mpc52xx_restart,
85 	.calibrate_decr	= generic_calibrate_decr,
86 };
87