mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 13:22:55 +07:00
64fc2a947a
All low-level PM/SMP code using virt_to_phys() should actually use __pa_symbol() against kernel symbols. Update code where relevant to move away from virt_to_phys(). Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
|
|
* linux/arch/arm/mach-vexpress/platsmp.c
|
|
*
|
|
* Copyright (C) 2002 ARM Ltd.
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/vexpress.h>
|
|
|
|
#include <asm/mcpm.h>
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/mach/map.h>
|
|
|
|
#include <plat/platsmp.h>
|
|
|
|
#include "core.h"
|
|
|
|
bool __init vexpress_smp_init_ops(void)
|
|
{
|
|
#ifdef CONFIG_MCPM
|
|
int cpu;
|
|
struct device_node *cpu_node, *cci_node;
|
|
|
|
/*
|
|
* The best way to detect a multi-cluster configuration
|
|
* is to detect if the kernel can take over CCI ports
|
|
* control. Loop over possible CPUs and check if CCI
|
|
* port control is available.
|
|
* Override the default vexpress_smp_ops if so.
|
|
*/
|
|
for_each_possible_cpu(cpu) {
|
|
bool available;
|
|
|
|
cpu_node = of_get_cpu_node(cpu, NULL);
|
|
if (WARN(!cpu_node, "Missing cpu device node!"))
|
|
return false;
|
|
|
|
cci_node = of_parse_phandle(cpu_node, "cci-control-port", 0);
|
|
available = cci_node && of_device_is_available(cci_node);
|
|
of_node_put(cci_node);
|
|
of_node_put(cpu_node);
|
|
|
|
if (!available)
|
|
return false;
|
|
}
|
|
|
|
mcpm_smp_set_ops();
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = {
|
|
{ .compatible = "arm,cortex-a5-scu", },
|
|
{ .compatible = "arm,cortex-a9-scu", },
|
|
{}
|
|
};
|
|
|
|
static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
struct device_node *scu = of_find_matching_node(NULL,
|
|
vexpress_smp_dt_scu_match);
|
|
|
|
if (scu)
|
|
scu_enable(of_iomap(scu, 0));
|
|
|
|
/*
|
|
* Write the address of secondary startup into the
|
|
* system-wide flags register. The boot monitor waits
|
|
* until it receives a soft interrupt, and then the
|
|
* secondary CPU branches to this address.
|
|
*/
|
|
vexpress_flags_set(__pa_symbol(versatile_secondary_startup));
|
|
}
|
|
|
|
const struct smp_operations vexpress_smp_dt_ops __initconst = {
|
|
.smp_prepare_cpus = vexpress_smp_dt_prepare_cpus,
|
|
.smp_secondary_init = versatile_secondary_init,
|
|
.smp_boot_secondary = versatile_boot_secondary,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_die = vexpress_cpu_die,
|
|
#endif
|
|
};
|