1 /*
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
35 static const struct of_device_id iss4xx_of_bus[] __initconst = {
36 { .compatible = "ibm,plb4", },
37 { .compatible = "ibm,plb6", },
38 { .compatible = "ibm,opb", },
39 { .compatible = "ibm,ebc", },
40 {},
41 };
42
iss4xx_device_probe(void)43 static 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 }
50 machine_device_initcall(iss4xx, iss4xx_device_probe);
51
52 /* We can have either UICs or MPICs */
iss4xx_init_irq(void)53 static 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_NO_RESET, 0, 0, " MPIC ");
75 BUG_ON(mpic == NULL);
76 mpic_init(mpic);
77 ppc_md.get_irq = mpic_get_irq;
78 #endif
79 } else
80 panic("Unrecognized top level interrupt controller");
81 }
82
83 #ifdef CONFIG_SMP
smp_iss4xx_setup_cpu(int cpu)84 static void smp_iss4xx_setup_cpu(int cpu)
85 {
86 mpic_setup_this_cpu();
87 }
88
smp_iss4xx_kick_cpu(int cpu)89 static int smp_iss4xx_kick_cpu(int cpu)
90 {
91 struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
92 const u64 *spin_table_addr_prop;
93 u32 *spin_table;
94 extern void start_secondary_47x(void);
95
96 BUG_ON(cpunode == NULL);
97
98 /* Assume spin table. We could test for the enable-method in
99 * the device-tree but currently there's little point as it's
100 * our only supported method
101 */
102 spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr",
103 NULL);
104 if (spin_table_addr_prop == NULL) {
105 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu);
106 return -ENOENT;
107 }
108
109 /* Assume it's mapped as part of the linear mapping. This is a bit
110 * fishy but will work fine for now
111 */
112 spin_table = (u32 *)__va(*spin_table_addr_prop);
113 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
114
115 spin_table[3] = cpu;
116 smp_wmb();
117 spin_table[1] = __pa(start_secondary_47x);
118 mb();
119
120 return 0;
121 }
122
123 static struct smp_ops_t iss_smp_ops = {
124 .probe = smp_mpic_probe,
125 .message_pass = smp_mpic_message_pass,
126 .setup_cpu = smp_iss4xx_setup_cpu,
127 .kick_cpu = smp_iss4xx_kick_cpu,
128 .give_timebase = smp_generic_give_timebase,
129 .take_timebase = smp_generic_take_timebase,
130 };
131
iss4xx_smp_init(void)132 static void __init iss4xx_smp_init(void)
133 {
134 if (mmu_has_feature(MMU_FTR_TYPE_47x))
135 smp_ops = &iss_smp_ops;
136 }
137
138 #else /* CONFIG_SMP */
iss4xx_smp_init(void)139 static void __init iss4xx_smp_init(void) { }
140 #endif /* CONFIG_SMP */
141
iss4xx_setup_arch(void)142 static void __init iss4xx_setup_arch(void)
143 {
144 iss4xx_smp_init();
145 }
146
147 /*
148 * Called very early, MMU is off, device-tree isn't unflattened
149 */
iss4xx_probe(void)150 static int __init iss4xx_probe(void)
151 {
152 if (!of_machine_is_compatible("ibm,iss-4xx"))
153 return 0;
154
155 return 1;
156 }
157
define_machine(iss4xx)158 define_machine(iss4xx) {
159 .name = "ISS-4xx",
160 .probe = iss4xx_probe,
161 .progress = udbg_progress,
162 .init_IRQ = iss4xx_init_irq,
163 .setup_arch = iss4xx_setup_arch,
164 .restart = ppc4xx_reset_system,
165 .calibrate_decr = generic_calibrate_decr,
166 };
167
