97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/mach-vexpress/mcpm_platsmp.c
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*
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* Created by: Nicolas Pitre, November 2012
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* Copyright: (C) 2012-2013 Linaro Limited
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*
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* Code to handle secondary CPU bringup and hotplug for the cluster power API.
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <asm/mcpm.h>
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#include <asm/smp.h>
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#include <asm/smp_plat.h>
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static void cpu_to_pcpu(unsigned int cpu,
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unsigned int *pcpu, unsigned int *pcluster)
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{
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unsigned int mpidr;
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mpidr = cpu_logical_map(cpu);
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*pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
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*pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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}
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static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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unsigned int pcpu, pcluster, ret;
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extern void secondary_startup(void);
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cpu_to_pcpu(cpu, &pcpu, &pcluster);
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pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n",
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__func__, cpu, pcpu, pcluster);
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mcpm_set_entry_vector(pcpu, pcluster, NULL);
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ret = mcpm_cpu_power_up(pcpu, pcluster);
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if (ret)
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return ret;
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mcpm_set_entry_vector(pcpu, pcluster, secondary_startup);
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arch_send_wakeup_ipi_mask(cpumask_of(cpu));
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dsb_sev();
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return 0;
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}
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static void mcpm_secondary_init(unsigned int cpu)
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{
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mcpm_cpu_powered_up();
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int mcpm_cpu_kill(unsigned int cpu)
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{
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unsigned int pcpu, pcluster;
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cpu_to_pcpu(cpu, &pcpu, &pcluster);
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return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster);
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}
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static bool mcpm_cpu_can_disable(unsigned int cpu)
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{
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/* We assume all CPUs may be shut down. */
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return true;
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}
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static void mcpm_cpu_die(unsigned int cpu)
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{
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unsigned int mpidr, pcpu, pcluster;
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mpidr = read_cpuid_mpidr();
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pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
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pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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mcpm_set_entry_vector(pcpu, pcluster, NULL);
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mcpm_cpu_power_down();
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}
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#endif
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static const struct smp_operations mcpm_smp_ops __initconst = {
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.smp_boot_secondary = mcpm_boot_secondary,
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.smp_secondary_init = mcpm_secondary_init,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_kill = mcpm_cpu_kill,
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.cpu_can_disable = mcpm_cpu_can_disable,
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.cpu_die = mcpm_cpu_die,
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#endif
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};
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void __init mcpm_smp_set_ops(void)
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{
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smp_set_ops(&mcpm_smp_ops);
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}
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