1 /* 2 * Copyright (C) 2013 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_CPU_OPS_H 17 #define __ASM_CPU_OPS_H 18 19 #include <linux/init.h> 20 #include <linux/threads.h> 21 22 struct device_node; 23 24 /** 25 * struct cpu_operations - Callback operations for hotplugging CPUs. 26 * 27 * @name: Name of the property as appears in a devicetree cpu node's 28 * enable-method property. 29 * @cpu_init: Reads any data necessary for a specific enable-method from the 30 * devicetree, for a given cpu node and proposed logical id. 31 * @cpu_prepare: Early one-time preparation step for a cpu. If there is a 32 * mechanism for doing so, tests whether it is possible to boot 33 * the given CPU. 34 * @cpu_boot: Boots a cpu into the kernel. 35 * @cpu_postboot: Optionally, perform any post-boot cleanup or necesary 36 * synchronisation. Called from the cpu being booted. 37 * @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific 38 * reason, which will cause the hot unplug to be aborted. Called 39 * from the cpu to be killed. 40 * @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the 41 * cpu being killed. 42 */ 43 struct cpu_operations { 44 const char *name; 45 int (*cpu_init)(struct device_node *, unsigned int); 46 int (*cpu_prepare)(unsigned int); 47 int (*cpu_boot)(unsigned int); 48 void (*cpu_postboot)(void); 49 #ifdef CONFIG_HOTPLUG_CPU 50 int (*cpu_disable)(unsigned int cpu); 51 void (*cpu_die)(unsigned int cpu); 52 #endif 53 }; 54 55 extern const struct cpu_operations *cpu_ops[NR_CPUS]; 56 extern int __init cpu_read_ops(struct device_node *dn, int cpu); 57 extern void __init cpu_read_bootcpu_ops(void); 58 59 #endif /* ifndef __ASM_CPU_OPS_H */ 60