LXR linux/arch/arm/mach-vexpress/platsmp.c

   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};
  75