1 /* 2 * linux/arch/arm/mach-vexpress/mcpm_platsmp.c 3 * 4 * Created by: Nicolas Pitre, November 2012 5 * Copyright: (C) 2012-2013 Linaro Limited 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Code to handle secondary CPU bringup and hotplug for the cluster power API. 12 */ 13 14 #include <linux/init.h> 15 #include <linux/smp.h> 16 #include <linux/spinlock.h> 17 18 #include <asm/mcpm.h> 19 #include <asm/smp.h> 20 #include <asm/smp_plat.h> 21 22 static void __init simple_smp_init_cpus(void) 23 { 24 } 25 26 static int __cpuinit mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) 27 { 28 unsigned int mpidr, pcpu, pcluster, ret; 29 extern void secondary_startup(void); 30 31 mpidr = cpu_logical_map(cpu); 32 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 33 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 34 pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", 35 __func__, cpu, pcpu, pcluster); 36 37 mcpm_set_entry_vector(pcpu, pcluster, NULL); 38 ret = mcpm_cpu_power_up(pcpu, pcluster); 39 if (ret) 40 return ret; 41 mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); 42 arch_send_wakeup_ipi_mask(cpumask_of(cpu)); 43 dsb_sev(); 44 return 0; 45 } 46 47 static void __cpuinit mcpm_secondary_init(unsigned int cpu) 48 { 49 mcpm_cpu_powered_up(); 50 } 51 52 #ifdef CONFIG_HOTPLUG_CPU 53 54 static int mcpm_cpu_disable(unsigned int cpu) 55 { 56 /* 57 * We assume all CPUs may be shut down. 58 * This would be the hook to use for eventual Secure 59 * OS migration requests as described in the PSCI spec. 60 */ 61 return 0; 62 } 63 64 static void mcpm_cpu_die(unsigned int cpu) 65 { 66 unsigned int mpidr, pcpu, pcluster; 67 mpidr = read_cpuid_mpidr(); 68 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 69 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 70 mcpm_set_entry_vector(pcpu, pcluster, NULL); 71 mcpm_cpu_power_down(); 72 } 73 74 #endif 75 76 static struct smp_operations __initdata mcpm_smp_ops = { 77 .smp_init_cpus = simple_smp_init_cpus, 78 .smp_boot_secondary = mcpm_boot_secondary, 79 .smp_secondary_init = mcpm_secondary_init, 80 #ifdef CONFIG_HOTPLUG_CPU 81 .cpu_disable = mcpm_cpu_disable, 82 .cpu_die = mcpm_cpu_die, 83 #endif 84 }; 85 86 void __init mcpm_smp_set_ops(void) 87 { 88 smp_set_ops(&mcpm_smp_ops); 89 } 90