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59ac59f6 RK |
1 | /* |
2 | * linux/arch/arm/mach-vexpress/platsmp.c | |
3 | * | |
4 | * Copyright (C) 2002 ARM Ltd. | |
5 | * All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/init.h> | |
12 | #include <linux/errno.h> | |
59ac59f6 RK |
13 | #include <linux/smp.h> |
14 | #include <linux/io.h> | |
d2606f81 | 15 | #include <linux/of_address.h> |
38669e04 | 16 | #include <linux/vexpress.h> |
95d59741 | 17 | |
033a899c | 18 | #include <asm/mcpm.h> |
95d59741 | 19 | #include <asm/smp_scu.h> |
95d59741 | 20 | #include <asm/mach/map.h> |
59ac59f6 | 21 | |
59ac59f6 | 22 | #include <mach/motherboard.h> |
59ac59f6 | 23 | |
3695adc2 | 24 | #include <plat/platsmp.h> |
59ac59f6 | 25 | |
3695adc2 | 26 | #include "core.h" |
3705ff6d | 27 | |
59ac59f6 RK |
28 | /* |
29 | * Initialise the CPU possible map early - this describes the CPUs | |
30 | * which may be present or become present in the system. | |
31 | */ | |
3695adc2 | 32 | static void __init vexpress_smp_init_cpus(void) |
59ac59f6 | 33 | { |
d2606f81 | 34 | ct_desc->init_cpu_map(); |
59ac59f6 RK |
35 | } |
36 | ||
3695adc2 | 37 | static void __init vexpress_smp_prepare_cpus(unsigned int max_cpus) |
59ac59f6 | 38 | { |
59ac59f6 RK |
39 | /* |
40 | * Initialise the present map, which describes the set of CPUs | |
41 | * actually populated at the present time. | |
42 | */ | |
d2606f81 | 43 | ct_desc->smp_enable(max_cpus); |
05c74a6c | 44 | |
59ac59f6 | 45 | /* |
05c74a6c RK |
46 | * Write the address of secondary startup into the |
47 | * system-wide flags register. The boot monitor waits | |
48 | * until it receives a soft interrupt, and then the | |
49 | * secondary CPU branches to this address. | |
59ac59f6 | 50 | */ |
38669e04 | 51 | vexpress_flags_set(virt_to_phys(versatile_secondary_startup)); |
59ac59f6 | 52 | } |
3695adc2 MZ |
53 | |
54 | struct smp_operations __initdata vexpress_smp_ops = { | |
55 | .smp_init_cpus = vexpress_smp_init_cpus, | |
56 | .smp_prepare_cpus = vexpress_smp_prepare_cpus, | |
57 | .smp_secondary_init = versatile_secondary_init, | |
58 | .smp_boot_secondary = versatile_boot_secondary, | |
59 | #ifdef CONFIG_HOTPLUG_CPU | |
60 | .cpu_die = vexpress_cpu_die, | |
61 | #endif | |
62 | }; | |
033a899c JM |
63 | |
64 | bool __init vexpress_smp_init_ops(void) | |
65 | { | |
66 | #ifdef CONFIG_MCPM | |
67 | /* | |
68 | * The best way to detect a multi-cluster configuration at the moment | |
69 | * is to look for the presence of a CCI in the system. | |
70 | * Override the default vexpress_smp_ops if so. | |
71 | */ | |
72 | struct device_node *node; | |
73 | node = of_find_compatible_node(NULL, NULL, "arm,cci-400"); | |
74 | if (node && of_device_is_available(node)) { | |
75 | mcpm_smp_set_ops(); | |
76 | return true; | |
77 | } | |
78 | #endif | |
79 | return false; | |
80 | } | |
d2606f81 PM |
81 | |
82 | #if defined(CONFIG_OF) | |
83 | ||
84 | static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = { | |
85 | { .compatible = "arm,cortex-a5-scu", }, | |
86 | { .compatible = "arm,cortex-a9-scu", }, | |
87 | {} | |
88 | }; | |
89 | ||
90 | static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus) | |
91 | { | |
92 | struct device_node *scu = of_find_matching_node(NULL, | |
93 | vexpress_smp_dt_scu_match); | |
94 | ||
95 | if (scu) | |
96 | scu_enable(of_iomap(scu, 0)); | |
97 | ||
98 | /* | |
99 | * Write the address of secondary startup into the | |
100 | * system-wide flags register. The boot monitor waits | |
101 | * until it receives a soft interrupt, and then the | |
102 | * secondary CPU branches to this address. | |
103 | */ | |
104 | vexpress_flags_set(virt_to_phys(versatile_secondary_startup)); | |
105 | } | |
106 | ||
107 | struct smp_operations __initdata vexpress_smp_dt_ops = { | |
108 | .smp_prepare_cpus = vexpress_smp_dt_prepare_cpus, | |
109 | .smp_secondary_init = versatile_secondary_init, | |
110 | .smp_boot_secondary = versatile_boot_secondary, | |
111 | #ifdef CONFIG_HOTPLUG_CPU | |
112 | .cpu_die = vexpress_cpu_die, | |
113 | #endif | |
114 | }; | |
115 | ||
116 | #endif |