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e9e06f2853
This patch introduces support for waking up secondary CPU cores on Alpine platform. Signed-off-by: Barak Wasserstrom <barak@annapurnalabs.com> Signed-off-by: Tsahee Zidenberg <tsahee@annapurnalabs.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
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* SMP operations for Alpine platform.
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*
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* Copyright (C) 2015 Annapurna Labs Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <asm/smp_plat.h>
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#include "alpine_cpu_pm.h"
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static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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phys_addr_t addr;
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addr = virt_to_phys(secondary_startup);
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if (addr > (phys_addr_t)(uint32_t)(-1)) {
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pr_err("FAIL: resume address over 32bit (%pa)", &addr);
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return -EINVAL;
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}
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return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
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}
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static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
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{
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alpine_cpu_pm_init();
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}
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static struct smp_operations alpine_smp_ops __initdata = {
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.smp_prepare_cpus = alpine_smp_prepare_cpus,
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.smp_boot_secondary = alpine_boot_secondary,
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};
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CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);
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