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Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/mach-vexpress/platsmp.c
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*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/vexpress.h>
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#include <asm/mcpm.h>
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#include <asm/smp_scu.h>
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#include <asm/mach/map.h>
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#include <plat/platsmp.h>
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#include "core.h"
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bool __init vexpress_smp_init_ops(void)
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{
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#ifdef CONFIG_MCPM
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int cpu;
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struct device_node *cpu_node, *cci_node;
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/*
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* The best way to detect a multi-cluster configuration
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* is to detect if the kernel can take over CCI ports
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* control. Loop over possible CPUs and check if CCI
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* port control is available.
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* Override the default vexpress_smp_ops if so.
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*/
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for_each_possible_cpu(cpu) {
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bool available;
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cpu_node = of_get_cpu_node(cpu, NULL);
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if (WARN(!cpu_node, "Missing cpu device node!"))
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return false;
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cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0);
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available = cci_node && of_device_is_available(cci_node);
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of_node_put(cci_node);
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of_node_put(cpu_node);
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if (!available)
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return false;
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}
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mcpm_smp_set_ops();
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return true;
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#else
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return false;
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#endif
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}
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static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
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{ .compatible = "arm,cortex-a5-scu", },
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{ .compatible = "arm,cortex-a9-scu", },
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{}
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};
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static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
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{
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struct device_node *scu = of_find_matching_node(NULL,
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vexpress_smp_dt_scu_match);
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if (scu)
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scu_enable(of_iomap(scu, 0));
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/*
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* Write the address of secondary startup into the
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* system-wide flags register. The boot monitor waits
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* until it receives a soft interrupt, and then the
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* secondary CPU branches to this address.
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*/
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vexpress_flags_set(__pa_symbol(versatile_secondary_startup));
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void vexpress_cpu_die(unsigned int cpu)
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{
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versatile_immitation_cpu_die(cpu, 0x40);
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}
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#endif
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const struct smp_operations vexpress_smp_dt_ops __initconst = {
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.smp_prepare_cpus = vexpress_smp_dt_prepare_cpus,
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.smp_secondary_init = versatile_secondary_init,
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.smp_boot_secondary = versatile_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = vexpress_cpu_die,
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#endif
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};
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