67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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* Spin Table SMP initialisation
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*
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* Copyright (C) 2013 ARM 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 version 2 as
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* published by the Free Software Foundation.
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/smp.h>
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#include <asm/cacheflush.h>
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static phys_addr_t cpu_release_addr[NR_CPUS];
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static int __init smp_spin_table_init_cpu(struct device_node *dn, int cpu)
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{
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/*
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* Determine the address from which the CPU is polling.
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*/
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if (of_property_read_u64(dn, "cpu-release-addr",
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&cpu_release_addr[cpu])) {
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pr_err("CPU %d: missing or invalid cpu-release-addr property\n",
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cpu);
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return -1;
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}
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return 0;
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}
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static int __init smp_spin_table_prepare_cpu(int cpu)
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{
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void **release_addr;
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if (!cpu_release_addr[cpu])
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return -ENODEV;
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release_addr = __va(cpu_release_addr[cpu]);
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release_addr[0] = (void *)__pa(secondary_holding_pen);
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__flush_dcache_area(release_addr, sizeof(release_addr[0]));
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/*
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* Send an event to wake up the secondary CPU.
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*/
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sev();
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return 0;
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}
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const struct smp_enable_ops smp_spin_table_ops __initconst = {
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.name = "spin-table",
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.init_cpu = smp_spin_table_init_cpu,
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.prepare_cpu = smp_spin_table_prepare_cpu,
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};
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