Release 4.11 arch/arm/mach-vexpress/platsmp.c

/*
 *  linux/arch/arm/mach-vexpress/platsmp.c
 *
 *  Copyright (C) 2002 ARM Ltd.
 *  All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/vexpress.h>

#include <asm/mcpm.h>
#include <asm/smp_scu.h>
#include <asm/mach/map.h>

#include <plat/platsmp.h>

#include "core.h"



bool __init vexpress_smp_init_ops(void)
{
#ifdef CONFIG_MCPM
	int cpu;
	struct device_node *cpu_node, *cci_node;

	/*
         * The best way to detect a multi-cluster configuration
         * is to detect if the kernel can take over CCI ports
         * control. Loop over possible CPUs and check if CCI
         * port control is available.
         * Override the default vexpress_smp_ops if so.
         */
	for_each_possible_cpu(cpu) {
		bool available;

		cpu_node = of_get_cpu_node(cpu, NULL);
		if (WARN(!cpu_node, "Missing cpu device node!"))
			return false;

		cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0);
		available = cci_node && of_device_is_available(cci_node);
		of_node_put(cci_node);
		of_node_put(cpu_node);

		if (!available)
			return false;
	}

	mcpm_smp_set_ops();
	return true;
#else
	return false;
#endif
}

Contributors
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CommitProp
Lorenzo Pieralisi
68
64.76%
1
50.00%
Jon Medhurst (Tixy)
37
35.24%
1
50.00%
Total
105
100.00%
2
100.00%


static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
	{ .compatible = "arm,cortex-a5-scu", },
	{ .compatible = "arm,cortex-a9-scu", },
	{}
};



static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
{
	struct device_node *scu = of_find_matching_node(NULL,
			vexpress_smp_dt_scu_match);

	if (scu)
		scu_enable(of_iomap(scu, 0));

	/*
         * Write the address of secondary startup into the
         * system-wide flags register. The boot monitor waits
         * until it receives a soft interrupt, and then the
         * secondary CPU branches to this address.
         */
	vexpress_flags_set(__pa_symbol(versatile_secondary_startup));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pawel Moll
45
97.83%
1
50.00%
Florian Fainelli
1
2.17%
1
50.00%
Total
46
100.00%
2
100.00%


const struct smp_operations vexpress_smp_dt_ops __initconst = {
	.smp_prepare_cpus	= vexpress_smp_dt_prepare_cpus,
	.smp_secondary_init	= versatile_secondary_init,
	.smp_boot_secondary	= versatile_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_die		= vexpress_cpu_die,
#endif
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Pawel Moll
115
46.94%
3
33.33%
Lorenzo Pieralisi
68
27.76%
1
11.11%
Jon Medhurst (Tixy)
40
16.33%
1
11.11%
Russell King
16
6.53%
1
11.11%
Marc Zyngier
3
1.22%
1
11.11%
Masahiro Yamada
2
0.82%
1
11.11%
Florian Fainelli
1
0.41%
1
11.11%
Total
245
100.00%
9
100.00%
Directory: arch/arm/mach-vexpress

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