summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/44x/iss4xx.c
blob: c7c6758b3cfe56ff8a8c919adb6921d4b382c69d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*
 * PPC476 board specific routines
 *
 * Copyright 2010 Torez Smith, IBM Corporation.
 *
 * Based on earlier code:
 *    Matt Porter <mporter@kernel.crashing.org>
 *    Copyright 2002-2005 MontaVista Software Inc.
 *
 *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 *    Copyright (c) 2003-2005 Zultys Technologies
 *
 *    Rewritten and ported to the merged powerpc tree:
 *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/rtc.h>

#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include <asm/uic.h>
#include <asm/ppc4xx.h>
#include <asm/mpic.h>
#include <asm/mmu.h>

static const struct of_device_id iss4xx_of_bus[] __initconst = {
	{ .compatible = "ibm,plb4", },
	{ .compatible = "ibm,plb6", },
	{ .compatible = "ibm,opb", },
	{ .compatible = "ibm,ebc", },
	{},
};

static int __init iss4xx_device_probe(void)
{
	of_platform_bus_probe(NULL, iss4xx_of_bus, NULL);
	of_instantiate_rtc();

	return 0;
}
machine_device_initcall(iss4xx, iss4xx_device_probe);

/* We can have either UICs or MPICs */
static void __init iss4xx_init_irq(void)
{
	struct device_node *np;

	/* Find top level interrupt controller */
	for_each_node_with_property(np, "interrupt-controller") {
		if (of_get_property(np, "interrupts", NULL) == NULL)
			break;
	}
	if (np == NULL)
		panic("Can't find top level interrupt controller");

	/* Check type and do appropriate initialization */
	if (of_device_is_compatible(np, "ibm,uic")) {
		uic_init_tree();
		ppc_md.get_irq = uic_get_irq;
#ifdef CONFIG_MPIC
	} else if (of_device_is_compatible(np, "chrp,open-pic")) {
		/* The MPIC driver will get everything it needs from the
		 * device-tree, just pass 0 to all arguments
		 */
		struct mpic *mpic = mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
		BUG_ON(mpic == NULL);
		mpic_init(mpic);
		ppc_md.get_irq = mpic_get_irq;
#endif
	} else
		panic("Unrecognized top level interrupt controller");
}

#ifdef CONFIG_SMP
static void smp_iss4xx_setup_cpu(int cpu)
{
	mpic_setup_this_cpu();
}

static int smp_iss4xx_kick_cpu(int cpu)
{
	struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
	const u64 *spin_table_addr_prop;
	u32 *spin_table;
	extern void start_secondary_47x(void);

	BUG_ON(cpunode == NULL);

	/* Assume spin table. We could test for the enable-method in
	 * the device-tree but currently there's little point as it's
	 * our only supported method
	 */
	spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr",
					       NULL);
	if (spin_table_addr_prop == NULL) {
		pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu);
		return -ENOENT;
	}

	/* Assume it's mapped as part of the linear mapping. This is a bit
	 * fishy but will work fine for now
	 */
	spin_table = (u32 *)__va(*spin_table_addr_prop);
	pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);

	spin_table[3] = cpu;
	smp_wmb();
	spin_table[1] = __pa(start_secondary_47x);
	mb();

	return 0;
}

static struct smp_ops_t iss_smp_ops = {
	.probe		= smp_mpic_probe,
	.message_pass	= smp_mpic_message_pass,
	.setup_cpu	= smp_iss4xx_setup_cpu,
	.kick_cpu	= smp_iss4xx_kick_cpu,
	.give_timebase	= smp_generic_give_timebase,
	.take_timebase	= smp_generic_take_timebase,
};

static void __init iss4xx_smp_init(void)
{
	if (mmu_has_feature(MMU_FTR_TYPE_47x))
		smp_ops = &iss_smp_ops;
}

#else /* CONFIG_SMP */
static void __init iss4xx_smp_init(void) { }
#endif /* CONFIG_SMP */

static void __init iss4xx_setup_arch(void)
{
	iss4xx_smp_init();
}

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init iss4xx_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (!of_flat_dt_is_compatible(root, "ibm,iss-4xx"))
		return 0;

	return 1;
}

define_machine(iss4xx) {
	.name			= "ISS-4xx",
	.probe			= iss4xx_probe,
	.progress		= udbg_progress,
	.init_IRQ		= iss4xx_init_irq,
	.setup_arch		= iss4xx_setup_arch,
	.restart		= ppc4xx_reset_system,
	.calibrate_decr		= generic_calibrate_decr,
};