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 int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) 23 { 24 unsigned int mpidr, pcpu, pcluster, ret; 25 extern void secondary_startup(void); 26 27 mpidr = cpu_logical_map(cpu); 28 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 29 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 30 pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", 31 __func__, cpu, pcpu, pcluster); 32 33 mcpm_set_entry_vector(pcpu, pcluster, NULL); 34 ret = mcpm_cpu_power_up(pcpu, pcluster); 35 if (ret) 36 return ret; 37 mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); 38 arch_send_wakeup_ipi_mask(cpumask_of(cpu)); 39 dsb_sev(); 40 return 0; 41 } 42 43 static void mcpm_secondary_init(unsigned int cpu) 44 { 45 mcpm_cpu_powered_up(); 46 } 47 48 #ifdef CONFIG_HOTPLUG_CPU 49 50 static int mcpm_cpu_disable(unsigned int cpu) 51 { 52 /* 53 * We assume all CPUs may be shut down. 54 * This would be the hook to use for eventual Secure 55 * OS migration requests as described in the PSCI spec. 56 */ 57 return 0; 58 } 59 60 static void mcpm_cpu_die(unsigned int cpu) 61 { 62 unsigned int mpidr, pcpu, pcluster; 63 mpidr = read_cpuid_mpidr(); 64 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 65 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 66 mcpm_set_entry_vector(pcpu, pcluster, NULL); 67 mcpm_cpu_power_down(); 68 } 69 70 #endif 71 72 static struct smp_operations __initdata mcpm_smp_ops = { 73 .smp_boot_secondary = mcpm_boot_secondary, 74 .smp_secondary_init = mcpm_secondary_init, 75 #ifdef CONFIG_HOTPLUG_CPU 76 .cpu_disable = mcpm_cpu_disable, 77 .cpu_die = mcpm_cpu_die, 78 #endif 79 }; 80 81 void __init mcpm_smp_set_ops(void) 82 { 83 smp_set_ops(&mcpm_smp_ops); 84 } 85