projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ff221ba NP |
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 <linux/irqchip/arm-gic.h> | |
| 19 | ||
| 20 | #include <asm/mcpm.h> | |
| 21 | #include <asm/smp.h> | |
| 22 | #include <asm/smp_plat.h> | |
| 23 | ||
| 24 | static void __init simple_smp_init_cpus(void) | |
| 25 | { | |
| 26 | } | |
| 27 | ||
| 28 | static int __cpuinit mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
| 29 | { | |
| 30 | unsigned int mpidr, pcpu, pcluster, ret; | |
| 31 | extern void secondary_startup(void); | |
| 32 | ||
| 33 | mpidr = cpu_logical_map(cpu); | |
| 34 | pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
| 35 | pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
| 36 | pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", | |
| 37 | __func__, cpu, pcpu, pcluster); | |
| 38 | ||
| 39 | mcpm_set_entry_vector(pcpu, pcluster, NULL); | |
| 40 | ret = mcpm_cpu_power_up(pcpu, pcluster); | |
| 41 | if (ret) | |
| 42 | return ret; | |
| 43 | mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); | |
| 44 | arch_send_wakeup_ipi_mask(cpumask_of(cpu)); | |
| 45 | dsb_sev(); | |
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| 49 | static void __cpuinit mcpm_secondary_init(unsigned int cpu) | |
| 50 | { | |
| 51 | mcpm_cpu_powered_up(); | |
| 52 | gic_secondary_init(0); | |
| 53 | } | |
| 54 | ||
| 55 | #ifdef CONFIG_HOTPLUG_CPU | |
| 56 | ||
| 57 | static int mcpm_cpu_disable(unsigned int cpu) | |
| 58 | { | |
| 59 | /* | |
| 60 | * We assume all CPUs may be shut down. | |
| 61 | * This would be the hook to use for eventual Secure | |
| 62 | * OS migration requests as described in the PSCI spec. | |
| 63 | */ | |
| 64 | return 0; | |
| 65 | } | |
| 66 | ||
| 67 | static void mcpm_cpu_die(unsigned int cpu) | |
| 68 | { | |
| 69 | unsigned int mpidr, pcpu, pcluster; | |
| 70 | mpidr = read_cpuid_mpidr(); | |
| 71 | pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
| 72 | pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
| 73 | mcpm_set_entry_vector(pcpu, pcluster, NULL); | |
| 74 | mcpm_cpu_power_down(); | |
| 75 | } | |
| 76 | ||
| 77 | #endif | |
| 78 | ||
| a7eb7c6f | 79 | static struct smp_operations __initdata mcpm_smp_ops = { |
| 9ff221ba NP |
80 | .smp_init_cpus = simple_smp_init_cpus, |
| 81 | .smp_boot_secondary = mcpm_boot_secondary, | |
| 82 | .smp_secondary_init = mcpm_secondary_init, | |
| 83 | #ifdef CONFIG_HOTPLUG_CPU | |
| 84 | .cpu_disable = mcpm_cpu_disable, | |
| 85 | .cpu_die = mcpm_cpu_die, | |
| 86 | #endif | |
| 87 | }; | |
| a7eb7c6f NP |
88 | |
| 89 | void __init mcpm_smp_set_ops(void) | |
| 90 | { | |
| 91 | smp_set_ops(&mcpm_smp_ops); | |
| 92 | } |