mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* arch/arm/mach-sti/platsmp.c
|
|
*
|
|
* Copyright (C) 2013 STMicroelectronics (R&D) Limited.
|
|
* http://www.st.com
|
|
*
|
|
* Cloned from linux/arch/arm/mach-vexpress/platsmp.c
|
|
*
|
|
* Copyright (C) 2002 ARM Ltd.
|
|
* All Rights Reserved
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
|
|
#include "smp.h"
|
|
|
|
static u32 __iomem *cpu_strt_ptr;
|
|
|
|
static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
unsigned long entry_pa = __pa_symbol(secondary_startup);
|
|
|
|
/*
|
|
* Secondary CPU is initialised and started by a U-BOOTROM firmware.
|
|
* Secondary CPU is spinning and waiting for a write at cpu_strt_ptr.
|
|
* Writing secondary_startup address at cpu_strt_ptr makes it to
|
|
* jump directly to secondary_startup().
|
|
*/
|
|
__raw_writel(entry_pa, cpu_strt_ptr);
|
|
|
|
/* wmb so that data is actually written before cache flush is done */
|
|
smp_wmb();
|
|
sync_cache_w(cpu_strt_ptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
struct device_node *np;
|
|
void __iomem *scu_base;
|
|
u32 release_phys;
|
|
int cpu;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
|
|
|
|
if (np) {
|
|
scu_base = of_iomap(np, 0);
|
|
scu_enable(scu_base);
|
|
of_node_put(np);
|
|
}
|
|
|
|
if (max_cpus <= 1)
|
|
return;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
|
|
np = of_get_cpu_node(cpu, NULL);
|
|
|
|
if (!np)
|
|
continue;
|
|
|
|
if (of_property_read_u32(np, "cpu-release-addr",
|
|
&release_phys)) {
|
|
pr_err("CPU %d: missing or invalid cpu-release-addr "
|
|
"property\n", cpu);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* cpu-release-addr is usually configured in SBC DMEM but can
|
|
* also be in RAM.
|
|
*/
|
|
|
|
if (!memblock_is_memory(release_phys))
|
|
cpu_strt_ptr =
|
|
ioremap(release_phys, sizeof(release_phys));
|
|
else
|
|
cpu_strt_ptr =
|
|
(u32 __iomem *)phys_to_virt(release_phys);
|
|
|
|
set_cpu_possible(cpu, true);
|
|
}
|
|
}
|
|
|
|
const struct smp_operations sti_smp_ops __initconst = {
|
|
.smp_prepare_cpus = sti_smp_prepare_cpus,
|
|
.smp_boot_secondary = sti_boot_secondary,
|
|
};
|