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
26bool __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
44static 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
50static 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
67const struct smp_operations vexpress_smp_dt_ops __initconst = {
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};