1 /*
2  * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
3  *
4  * Author: John Rigby, <jrigby@freescale.com>, Thur Mar 29 2007
5  *
6  * Description:
7  * MPC5121 ADS board setup
8  *
9  * This is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/io.h>
18 #include <linux/irq.h>
19 #include <linux/of_platform.h>
20 
21 #include <asm/machdep.h>
22 #include <asm/ipic.h>
23 #include <asm/prom.h>
24 #include <asm/time.h>
25 
26 /**
27  * 	mpc512x_find_ips_freq - Find the IPS bus frequency for a device
28  * 	@node:	device node
29  *
30  * 	Returns IPS bus frequency, or 0 if the bus frequency cannot be found.
31  */
32 unsigned long
33 mpc512x_find_ips_freq(struct device_node *node)
34 {
35 	struct device_node *np;
36 	const unsigned int *p_ips_freq = NULL;
37 
38 	of_node_get(node);
39 	while (node) {
40 		p_ips_freq = of_get_property(node, "bus-frequency", NULL);
41 		if (p_ips_freq)
42 			break;
43 
44 		np = of_get_parent(node);
45 		of_node_put(node);
46 		node = np;
47 	}
48 	if (node)
49 		of_node_put(node);
50 
51 	return p_ips_freq ? *p_ips_freq : 0;
52 }
53 EXPORT_SYMBOL(mpc512x_find_ips_freq);
54 
55 static struct of_device_id __initdata of_bus_ids[] = {
56 	{ .name = "soc", },
57 	{ .name = "localbus", },
58 	{},
59 };
60 
61 static void __init mpc5121_ads_declare_of_platform_devices(void)
62 {
63 	/* Find every child of the SOC node and add it to of_platform */
64 	if (of_platform_bus_probe(NULL, of_bus_ids, NULL))
65 		printk(KERN_ERR __FILE__ ": "
66 			"Error while probing of_platform bus\n");
67 }
68 
69 static void __init mpc5121_ads_init_IRQ(void)
70 {
71 	struct device_node *np;
72 
73 	np = of_find_compatible_node(NULL, NULL, "fsl,ipic");
74 	if (!np)
75 		return;
76 
77 	ipic_init(np, 0);
78 	of_node_put(np);
79 
80 	/*
81 	 * Initialize the default interrupt mapping priorities,
82 	 * in case the boot rom changed something on us.
83 	 */
84 	ipic_set_default_priority();
85 }
86 
87 /*
88  * Called very early, MMU is off, device-tree isn't unflattened
89  */
90 static int __init mpc5121_ads_probe(void)
91 {
92 	unsigned long root = of_get_flat_dt_root();
93 
94 	return of_flat_dt_is_compatible(root, "fsl,mpc5121ads");
95 }
96 
97 define_machine(mpc5121_ads) {
98 	.name			= "MPC5121 ADS",
99 	.probe			= mpc5121_ads_probe,
100 	.init			= mpc5121_ads_declare_of_platform_devices,
101 	.init_IRQ		= mpc5121_ads_init_IRQ,
102 	.get_irq		= ipic_get_irq,
103 	.calibrate_decr		= generic_calibrate_decr,
104 };
105