94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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 "platsmp.h"
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#include "vexpress.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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