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