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96 lines
2.2 KiB
96 lines
2.2 KiB
// 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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