blob: aa46e9d1e77124c43a21f802beb5306eb1435369 [file] [log] [blame]
Torez Smithb4e8c8d2010-03-05 10:45:54 +00001/*
2 * PPC476 board specific routines
3 *
4 * Copyright 2010 Torez Smith, IBM Corporation.
5 *
6 * Based on earlier code:
7 * Matt Porter <mporter@kernel.crashing.org>
8 * Copyright 2002-2005 MontaVista Software Inc.
9 *
10 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
11 * Copyright (c) 2003-2005 Zultys Technologies
12 *
13 * Rewritten and ported to the merged powerpc tree:
14 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the
18 * Free Software Foundation; either version 2 of the License, or (at your
19 * option) any later version.
20 */
21
22#include <linux/init.h>
23#include <linux/of_platform.h>
24#include <linux/rtc.h>
25
26#include <asm/machdep.h>
27#include <asm/prom.h>
28#include <asm/udbg.h>
29#include <asm/time.h>
30#include <asm/uic.h>
31#include <asm/ppc4xx.h>
32#include <asm/mpic.h>
33#include <asm/mmu.h>
34
35static __initdata struct of_device_id iss4xx_of_bus[] = {
36 { .compatible = "ibm,plb4", },
37 { .compatible = "ibm,plb6", },
38 { .compatible = "ibm,opb", },
39 { .compatible = "ibm,ebc", },
40 {},
41};
42
43static int __init iss4xx_device_probe(void)
44{
45 of_platform_bus_probe(NULL, iss4xx_of_bus, NULL);
46 of_instantiate_rtc();
47
48 return 0;
49}
50machine_device_initcall(iss4xx, iss4xx_device_probe);
51
52/* We can have either UICs or MPICs */
53static void __init iss4xx_init_irq(void)
54{
55 struct device_node *np;
56
57 /* Find top level interrupt controller */
58 for_each_node_with_property(np, "interrupt-controller") {
59 if (of_get_property(np, "interrupts", NULL) == NULL)
60 break;
61 }
62 if (np == NULL)
63 panic("Can't find top level interrupt controller");
64
65 /* Check type and do appropriate initialization */
66 if (of_device_is_compatible(np, "ibm,uic")) {
67 uic_init_tree();
68 ppc_md.get_irq = uic_get_irq;
69#ifdef CONFIG_MPIC
70 } else if (of_device_is_compatible(np, "chrp,open-pic")) {
71 /* The MPIC driver will get everything it needs from the
72 * device-tree, just pass 0 to all arguments
73 */
74 struct mpic *mpic = mpic_alloc(np, 0, MPIC_PRIMARY, 0, 0,
75 " MPIC ");
76 BUG_ON(mpic == NULL);
77 mpic_init(mpic);
78 ppc_md.get_irq = mpic_get_irq;
79#endif
80 } else
81 panic("Unrecognized top level interrupt controller");
82}
83
84#ifdef CONFIG_SMP
85static void __cpuinit smp_iss4xx_setup_cpu(int cpu)
86{
87 mpic_setup_this_cpu();
88}
89
90static void __cpuinit smp_iss4xx_kick_cpu(int cpu)
91{
92 struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
93 const u64 *spin_table_addr_prop;
94 u32 *spin_table;
95 extern void start_secondary_47x(void);
96
97 BUG_ON(cpunode == NULL);
98
99 /* Assume spin table. We could test for the enable-method in
100 * the device-tree but currently there's little point as it's
101 * our only supported method
102 */
103 spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr",
104 NULL);
105 if (spin_table_addr_prop == NULL) {
106 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu);
107 return;
108 }
109
110 /* Assume it's mapped as part of the linear mapping. This is a bit
111 * fishy but will work fine for now
112 */
113 spin_table = (u32 *)__va(*spin_table_addr_prop);
114 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
115
116 spin_table[3] = cpu;
117 smp_wmb();
118 spin_table[1] = __pa(start_secondary_47x);
119 mb();
120}
121
122static struct smp_ops_t iss_smp_ops = {
123 .probe = smp_mpic_probe,
124 .message_pass = smp_mpic_message_pass,
125 .setup_cpu = smp_iss4xx_setup_cpu,
126 .kick_cpu = smp_iss4xx_kick_cpu,
127 .give_timebase = smp_generic_give_timebase,
128 .take_timebase = smp_generic_take_timebase,
129};
130
131static void __init iss4xx_smp_init(void)
132{
133 if (mmu_has_feature(MMU_FTR_TYPE_47x))
134 smp_ops = &iss_smp_ops;
135}
136
137#else /* CONFIG_SMP */
138static void __init iss4xx_smp_init(void) { }
139#endif /* CONFIG_SMP */
140
141static void __init iss4xx_setup_arch(void)
142{
143 iss4xx_smp_init();
144}
145
146/*
147 * Called very early, MMU is off, device-tree isn't unflattened
148 */
149static int __init iss4xx_probe(void)
150{
151 unsigned long root = of_get_flat_dt_root();
152
153 if (!of_flat_dt_is_compatible(root, "ibm,iss-4xx"))
154 return 0;
155
156 return 1;
157}
158
159define_machine(iss4xx) {
160 .name = "ISS-4xx",
161 .probe = iss4xx_probe,
162 .progress = udbg_progress,
163 .init_IRQ = iss4xx_init_irq,
164 .setup_arch = iss4xx_setup_arch,
165 .restart = ppc4xx_reset_system,
166 .calibrate_decr = generic_calibrate_decr,
167};