https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 1e28eed17697bcf343c6743f0028cc3b5dd88bf0 authored by Linus Torvalds on 14 March 2021, 21:41:02 UTC
Linux 5.12-rc3
Linux 5.12-rc3
Tip revision: 1e28eed
platsmp-scu.c
// SPDX-License-Identifier: GPL-2.0
/*
* SMP support for SoCs with SCU covered by mach-shmobile
*
* Copyright (C) 2013 Magnus Damm
*/
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include "common.h"
static phys_addr_t shmobile_scu_base_phys;
static void __iomem *shmobile_scu_base;
static int shmobile_scu_cpu_prepare(unsigned int cpu)
{
/* For this particular CPU register SCU SMP boot vector */
shmobile_smp_hook(cpu, __pa_symbol(shmobile_boot_scu),
shmobile_scu_base_phys);
return 0;
}
void __init shmobile_smp_scu_prepare_cpus(phys_addr_t scu_base_phys,
unsigned int max_cpus)
{
/* install boot code shared by all CPUs */
shmobile_boot_fn = __pa_symbol(shmobile_smp_boot);
/* enable SCU and cache coherency on booting CPU */
shmobile_scu_base_phys = scu_base_phys;
shmobile_scu_base = ioremap(scu_base_phys, PAGE_SIZE);
scu_enable(shmobile_scu_base);
scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
/* Use CPU notifier for reset vector control */
cpuhp_setup_state_nocalls(CPUHP_ARM_SHMOBILE_SCU_PREPARE,
"arm/shmobile-scu:prepare",
shmobile_scu_cpu_prepare, NULL);
}
#ifdef CONFIG_HOTPLUG_CPU
void shmobile_smp_scu_cpu_die(unsigned int cpu)
{
/* For this particular CPU deregister boot vector */
shmobile_smp_hook(cpu, 0, 0);
dsb();
flush_cache_all();
/* disable cache coherency */
scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF);
/* jump to shared mach-shmobile sleep / reset code */
shmobile_smp_sleep();
}
static int shmobile_smp_scu_psr_core_disabled(int cpu)
{
unsigned long mask = SCU_PM_POWEROFF << (cpu * 8);
if ((readl(shmobile_scu_base + 8) & mask) == mask)
return 1;
return 0;
}
int shmobile_smp_scu_cpu_kill(unsigned int cpu)
{
int k;
/* this function is running on another CPU than the offline target,
* here we need wait for shutdown code in platform_cpu_die() to
* finish before asking SoC-specific code to power off the CPU core.
*/
for (k = 0; k < 1000; k++) {
if (shmobile_smp_scu_psr_core_disabled(cpu))
return 1;
mdelay(1);
}
return 0;
}
#endif