1 /* 2 * SMP support for R-Mobile / SH-Mobile 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * Copyright (C) 2011 Paul Mundt 6 * 7 * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 #include <linux/init.h> 14 #include <asm/cacheflush.h> 15 #include <asm/smp_plat.h> 16 #include "common.h" 17 18 extern unsigned long shmobile_smp_fn[]; 19 extern unsigned long shmobile_smp_arg[]; 20 extern unsigned long shmobile_smp_mpidr[]; 21 22 void shmobile_smp_hook(unsigned int cpu, unsigned long fn, unsigned long arg) 23 { 24 shmobile_smp_fn[cpu] = 0; 25 flush_cache_all(); 26 27 shmobile_smp_mpidr[cpu] = cpu_logical_map(cpu); 28 shmobile_smp_fn[cpu] = fn; 29 shmobile_smp_arg[cpu] = arg; 30 flush_cache_all(); 31 } 32 33 #ifdef CONFIG_HOTPLUG_CPU 34 bool shmobile_smp_cpu_can_disable(unsigned int cpu) 35 { 36 return true; /* Hotplug of any CPU is supported */ 37 } 38 #endif 39 40 bool __init shmobile_smp_init_fallback_ops(void) 41 { 42 /* fallback on PSCI/smp_ops if no other DT based method is detected */ 43 if (!IS_ENABLED(CONFIG_SMP)) 44 return false; 45 46 return platform_can_secondary_boot() ? true : false; 47 } 48