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>
13 #include <linux/smp.h>
14 #include <linux/io.h>
15 #include <linux/of_address.h>
16 #include <linux/vexpress.h>
17
18 #include <asm/mcpm.h>
19 #include <asm/smp_scu.h>
20 #include <asm/mach/map.h>
21
22 #include <plat/platsmp.h>
23
24 #include "core.h"
25
vexpress_smp_init_ops(void)26 bool __init vexpress_smp_init_ops(void)
27 {
28 #ifdef CONFIG_MCPM
29 /*
30 * The best way to detect a multi-cluster configuration at the moment
31 * is to look for the presence of a CCI in the system.
32 * Override the default vexpress_smp_ops if so.
33 */
34 struct device_node *node;
35 node = of_find_compatible_node(NULL, NULL, "arm,cci-400");
36 if (node && of_device_is_available(node)) {
37 mcpm_smp_set_ops();
38 return true;
39 }
40 #endif
41 return false;
42 }
43
44 static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
45 { .compatible = "arm,cortex-a5-scu", },
46 { .compatible = "arm,cortex-a9-scu", },
47 {}
48 };
49
vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)50 static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
51 {
52 struct device_node *scu = of_find_matching_node(NULL,
53 vexpress_smp_dt_scu_match);
54
55 if (scu)
56 scu_enable(of_iomap(scu, 0));
57
58 /*
59 * Write the address of secondary startup into the
60 * system-wide flags register. The boot monitor waits
61 * until it receives a soft interrupt, and then the
62 * secondary CPU branches to this address.
63 */
64 vexpress_flags_set(virt_to_phys(versatile_secondary_startup));
65 }
66
67 struct smp_operations __initdata vexpress_smp_dt_ops = {
68 .smp_prepare_cpus = vexpress_smp_dt_prepare_cpus,
69 .smp_secondary_init = versatile_secondary_init,
70 .smp_boot_secondary = versatile_boot_secondary,
71 #ifdef CONFIG_HOTPLUG_CPU
72 .cpu_die = vexpress_cpu_die,
73 #endif
74 };
75